JP6915837B2 - Glass fiber cloth for dust collection filter and bag filter provided with the cloth - Google Patents

Description

The present invention relates to a glass fiber cloth for a dust collecting filter, and more specifically, to a glass fiber cloth for a dust collecting filter, which is useful as a dust collecting filter such as a bag filter, which is required to have breakage resistance.

Cloth made of glass fiber is used as a filter material used in dust collectors for capturing dust (fly ash) in exhaust gas generated in municipal waste incinerators, industrial waste incinerators, coal-fired boilers, metal melting furnaces, etc. Has been done.

Generally, a bag filter method is adopted for filtering exhaust gas from an incinerator of municipal waste. Specifically, in the bug filter method, a cloth made of glass fiber is used to sew a bug (for example, a cylindrical shape having a diameter of 120 to 170 mm and a length of 4 to 7 m), and a large number of the bugs are installed in a dust collector. do. Then, dust-containing exhaust gas (usually, the gas temperature is 130 to 280 ° C.) flows in from the outer surface of the bug, dust in the gas is collected on the outer surface of the bug, and only the exhaust gas flows out from the inner surface of the bug. Go. In this case, the pressure loss of the bug increases with the lapse of the operating time of the incinerator, which adversely affects the filtration performance. Therefore, it is necessary to wipe off the dust accumulated on the outer surface of the bug at any time. As a method of removing dust, a vibration type, a backwash type, and a pulse type are generally used. For example, in the case of the pulse type, compressed air is instantaneously (for example, about 0.1 to 0.3 seconds) injected into the inside of the bug from the nozzle at the top of the bug to wipe off the dust on the outer surface of the bug. The injection air pressure in this case is as high as 5 to 7 kg / square cm, for example, and is injected every fixed time (for example, 1 to 3 min). When these dusts are wiped off, the cloth made of glass fibers constituting the bag filter is repeatedly bent. Therefore, the fabric is required to have folding resistance.

As a cloth for bag filters, for example, a double-layered cloth having a tyrogue structure on both the front and back sides, which is composed of a flat yarn made of glass fiber for the warp and a bulky yarn made of glass fiber for the weft, has a bulky ratio KB of 30% or more on both the front and back sides. Moreover, a cloth for a bag filter having a bulky ratio KB of at least one side of 85% or less is known (see, for example, Patent Document 1). According to the cloth, it is possible to improve the dust releasability while maintaining the dust collection efficiency.

Japanese Unexamined Patent Publication No. 4-327237

In Patent Document 1, specifically, in Examples, it is disclosed that E glass is used as a glass material constituting a glass fiber and that it is impregnated with a water emulsion of a polytetrafluoroethylene resin. ..

However, as examined by the present inventor, the cloth disclosed in Patent Document 1 has a problem that its folding resistance may be significantly lowered when it is exposed to heat at an atmospheric temperature exceeding 250 ° C., for example, 400 ° C. I learned that there is.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a glass fiber cloth having excellent folding resistance even at an atmospheric temperature exceeding 250 ° C.

As a result of repeated studies to solve the above problems, the present inventor has not considered that it is contained as an antistatic agent, for example, and directly contributes to the improvement of folding resistance for the purpose of improving folding resistance. , Focused on graphite. By using a specific glass composition as the glass material constituting the glass fiber and containing graphite as a treatment agent for the glass fiber fabric, the folding resistance at an atmospheric temperature exceeding 250 ° C. is synergistic. Found to improve. The present invention is an invention completed by further studying based on these findings.

That is, the present invention provides the inventions of the following aspects.
Item 1. A cloth made of glass fibers, the glass composition containing a treatment agent containing graphite on the glass fibers and constituting the glass fibers has a SiO ₂ content of 64.0 to 66.0% by mass. , Al ₂ O ₃ content is 24.0 to 26.0% by mass, MgO content is 9.0 to 11.0%, and the content of other components is 3% by mass or less (including 0% by mass). ), Glass fiber cloth for dust collection filter.
Item 2. A cloth made of glass fibers, the glass composition containing a treatment agent containing graphite on the glass fibers and constituting the glass fibers has a SiO ₂ content of 60.0 to 66.0% by mass. , A glass fiber cloth for a dust collecting filter, which is a glass composition containing 18.0 to 26.0% by mass of _{Al 2} O _{3 and 8.0 to 20.0% of Mg O.}
Item 3. Item 2. The glass fiber cloth for a dust collecting filter according to Item 1 or 2, wherein the treatment agent contains a thermoplastic resin or silicone oil having no side chains and branches in the molecular structure.
Item 4. Item 2. The glass fiber cloth for a dust collecting filter according to any one of Items 1 to 3, which contains carboxymethyl cellulose in the treatment agent.
Item 5. Item 2. The above-mentioned glass fiber cloth for a dust collecting filter.
Item 6. Item 2. The glass fiber cloth for a dust collecting filter according to any one of Items 1 to 5, wherein the graphite content in the treatment agent is 30% by mass or more.
Item 7. Item 2. The glass fiber cloth for a dust collecting filter according to any one of Items 1 to 6, wherein the folding resistance measured by the following evaluation method is 20000 times or more in the warp direction and 20000 times or more in the weft direction.
(Evaluation method)
The fabric is heat-exposed at 400 ° C. for 24 hours in a muffle furnace and naturally cooled. Measure and calculate with a load of 9.8N.
Item 8. Item 2. The heat-resistant fiber fabric according to any one of Items 1 to 7, wherein the folding resistance measured by the following evaluation method is 300 times or more in the warp direction and 300 times or more in the weft direction.
(Evaluation method)
When measuring the length of the fabric in the measurement direction (that is, the warp direction when measuring the folding resistance in the warp direction) and the length in a direction different from the measurement direction (that is, when measuring the folding resistance in the warp direction) One piece is cut into a size of 23 cm (in the weft direction), and the cut glass fiber cloth is heat-treated in a high temp oven (trade name HP80 manufactured by Asahi Kagaku Co., Ltd.) at a temperature of 400 ° C. for 24 hours, and then the glass fiber cloth is used. Using a sample that has been naturally cooled, measure and calculate in the weft direction of the sample, with the R of the bending clamp set to 0.38 mm and the load set to 9.8 N, in accordance with JIS R 3420: 2013 7.14.
Item 9. Item 2. The glass fiber cloth for a dust collecting filter according to any one of Items 1 to 8, which is used for a bag filter.
Item 10. A bag filter comprising the glass fiber cloth for a dust collecting filter according to any one of Items 1 to 9.

According to the glass fiber cloth for a dust collecting filter of the present invention, a cloth made of glass fiber, wherein the glass fiber contains a treatment agent containing graphite, and the glass composition constituting the glass fiber is SiO. _{The content of 2} is 64.0 to 66.0% by mass, _{the content of Al 2} O ₃ is 24.0 to 26.0% by mass, the content of MgO is 9.0 to 11.0%, and other components. Since the content is 3% by mass or less (including 0% by mass), it is excellent in folding resistance even when exposed to heat at an atmospheric temperature exceeding 250 ° C.

It is a scanning electron micrograph which shows an example of the containing form of the processing agent contained in the cloth of this invention.

Hereinafter, the present invention will be described in detail.

(Glass fiber fabric)
The fabric of the present invention is made of glass fiber.

In the present invention, the glass composition constituting the glass fiber has a SiO ₂ content of 64.0 to 66.0% by mass, an Al ₂ O ₃ content of 24.0 to 26.0% by mass, and MgO. The content is 9.0 to 11.0%, and the content of other components is 3% by mass or less (including 0% by mass). Further, in the present invention, the glass composition constituting the glass fiber has a SiO ₂ content of 60.0 to 66.0 mass% and an Al ₂ O ₃ content of 18.0 to 26.0 mass%. It is a glass composition containing 8.0 to 20.0% of MgO.

Further, in the present invention, the glass composition constituting the glass fiber has a SiO ₂ content of 60.0 to 66.0 mass% and an Al ₂ O ₃ content of 18.0 to 26.0 mass%. the content of MgO is a glass composition comprising from 8.0 to 20.0% (the content of SiO ₂ is 64.0 to 66.0 wt%, the content of Al ₂ O ₃ is from 24.0 to 26.0 Glass compositions having a mass%, MgO content of 9.0 to 11.0%, and other component content of 3% by mass or less (including 0% by mass) can also be used. Further, the glass composition constituting the glass fiber has a SiO ₂ content of 60.0 to 64.0 mass%, an Al ₂ O ₃ content of 18.0 to 22.0 mass%, and an Mg O content. Is 14 to 18% by mass, and the total of _{the content of SiO 2} , the content of Al ₂ O _{3 and} the content of Mg O can be 94% by mass or more.

In the present invention, the glass fiber may be either a long fiber or a short fiber. Long fibers are preferable from the viewpoint of further improving mechanical properties such as tensile strength of the fabric. Examples of the long fibers include a monofilament yarn composed of one continuous single fiber and a multifilament yarn composed of a plurality of continuous single fibers, and are resistant to breakage when exposed to heat under conditions of an atmospheric temperature exceeding 250 ° C. A multifilament yarn is preferable from the viewpoint of making the property more excellent.

In the case of the above-mentioned long fibers, the form of the fabric of the present invention may be a woven fabric, a knitted fabric, a non-woven fabric (including felt), or a combination thereof. In the case of a woven fabric, it is preferable that the warp is a yarn which is a multifilament yarn and the weft is a bulky processed yarn (bulky processed yarn) which is a multifilament yarn from the viewpoint of further enhancing mechanical properties and dust collection. Examples of the yarn include single yarns and twisted yarns, and twisted yarns are preferable from the viewpoint of making the yarns more excellent in folding resistance when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. The composition of the twisted yarn is not particularly limited, but for example, 4 to 8 single yarn yarns are used from the viewpoint of further improving the folding resistance when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. It is preferable that 2 to 4 yarns obtained by twisting down in the S direction or the Z direction to form one yarn are twisted yarns twisted upward in the direction opposite to the bottom twist. Further, in the case of a woven fabric, the mechanical properties and the dust collecting property are further improved, and the folding resistance in the weft direction is further excellent when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. From the viewpoint of The number of twists of the yarn, the bulky processed yarn and the combined twisted yarn of the yarn is not particularly limited, but for example, from the above viewpoint, the upper twist is preferably 2 to 5 times / 25 mm, and 3.0 to 4.5 times /. 25 mm is more preferable.

When the warp yarn is a yarn and the weft yarn is a bulky processed yarn, the filament diameter (single fiber diameter) of the yarn is, for example, 4 to 9 μm, and is heat-exposed under the condition of an atmospheric temperature exceeding 250 ° C. In some cases, 4 to 7 μm is more preferable, and 4.5 to 5.5 μm is particularly preferable, from the viewpoint of making the folding resistance more excellent. On the other hand, in the above case, the filament diameter (single fiber diameter) of the bulky processed yarn is, for example, 4 to 9 μm, and the folding resistance becomes higher when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. From the viewpoint of making it excellent, 4 to 7 μm is more preferable, and 4.5 to 5.5 μm is particularly preferable. Further, when the weft is a fused yarn of a bulky processed yarn made of a multifilament yarn and a yarn made of a multifilament yarn, the filament diameter is, for example, 4 to 9 μm, and is under the condition of an atmospheric temperature exceeding 250 ° C. From the viewpoint of making the folding resistance more excellent when exposed to heat, 4 to 7 μm is more preferable, and 4.5 to 5.5 μm is particularly preferable.

In the present invention, when the fabric is a woven fabric in which the warp yarn is a yarn and the weft yarn is a bulky processed yarn, the yarn count is, for example, 30 to 600 tex, and the mechanical properties and the dust collecting property are further enhanced. From the viewpoint, 50 to 450 tex is more preferable, and the folding resistance is further improved when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. while further enhancing the mechanical properties and the dust collecting property. From the viewpoint, 100 to 200 tex is more preferable. On the other hand, in the above case, the count of the bulky processed yarn is, for example, 30 to 600 tex, and 50 to 500 tex is more preferable from the viewpoint of further enhancing the mechanical characteristics and the dust collecting property. 200 to 400 tex is more preferable from the viewpoint of further improving the folding resistance when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. while further improving the dust collecting property. Further, when the weft is a fused yarn of the bulky processed yarn made of the multifilament yarn and the yarn made of the multifilament yarn, the count of the entire twisted yarn is, for example, 30 to 600 tex, which is mechanical. From the viewpoint of further enhancing the characteristics and the dust collecting property, 50 to 500 tex is more preferable, and when the material is exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. while further enhancing the mechanical properties and the dust collecting property, From the viewpoint of further improving the folding resistance, 200 to 400 tex is more preferable. Further, when the weft is a combined twisted yarn of the bulky processed yarn made of the multifilament yarn and the yarn made of the multifilament yarn, the bulky yarn constituting the twisted yarn is formed from the viewpoint of making the above effect particularly excellent. The mass ratio of the machined yarn to the yarn per unit length (mass ratio per unit length of bulky processed yarn (tex) / mass per unit length of yarn (tex)) is preferably 3 to 20, preferably 5 to 20. 15 is more preferable, and 8 to 12 are particularly preferable. Further, when the fabric is a woven fabric in which the warp is yarn and the weft is bulky processed yarn, the ratio of the counts of the warp to the weft (warp / weft) is when the fabric is exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. In addition, from the viewpoint of further improving the folding resistance, 1/4 to 1/1 is preferable, and 2/5 to 1/2 is more preferable.

In the present invention, when the fabric is a woven fabric in which the warp yarn is yarn and the weft yarn is bulky processed yarn or bulky processed yarn and yarn twisted yarn, the weaving structure is not limited, and for example, plain weave, satin weave, twill weave, etc. Examples include twill weave, ridge weave, warp double weave, weft double weave, and double weave. A double woven structure is preferable from the viewpoint of making the folding resistance more excellent when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. In the fabric of the present invention, the weaving density is not particularly limited, but for example, when the fabric is a woven fabric in which the warp yarns are yarns and the weft yarns are bulky processed yarns, the warp yarns (yarns) are preferably 20 to 80 yarns / 25 mm. , 40 to 60 are more preferable. The weft yarn (bulky yarn or) is preferably 20 to 80 yarns / 25 mm, more preferably 30 to 60 yarns. Further, in the present invention, as the (excluding treatment agent.) Fabric made of glass fiber mass (g / m ^2), is not particularly limited, for example, include 500~1500g / m ^2, 700~1100g / m ² is preferred. Further, in the present invention, the thickness (mm) of the cloth made of glass fiber (excluding the treatment agent) is not particularly limited, and examples thereof include 0.3 to 1.5 mm, and 0.6 to 1 .2 mm is preferable.

(Processing agent)
The cloth of the present invention contains a treatment agent containing graphite on the glass fibers constituting the cloth.

By using the above-mentioned specific glass composition as the glass material constituting the glass fiber and containing graphite as a treatment agent for the glass fiber fabric, the folding resistance at an atmospheric temperature exceeding 250 ° C. is synergistic. To improve.

The content of the graphite in the treatment agent is preferably 30% by mass or more from the viewpoint of further improving the folding resistance when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. .. When the treatment agent contains components other than graphite, which will be described later, the upper limit of the graphite content in the treatment agent can be adjusted according to the blending ratio of the other components, for example. It can also be 30 to 80% by mass, 30 to 65% by mass, or the like. Further, for example, it may be 10 to 45 parts by mass.

In the present invention, the form and size of graphite are not particularly limited. Examples of the form of graphite include scale-like and earth-like forms. As for the size of graphite, for example, the integrated value in the particle size distribution of graphite measured using a laser diffraction / scattering particle size distribution measuring device (trade name LA-920 manufactured by HORIBA, Ltd.) is 50%. The particle size is 0.1 to 100 μm, preferably 1 to 50 μm.

In the present invention, the treatment agent containing graphite may contain components other than graphite.

The component other than the above graphite is not particularly limited, but may include, for example, a binder component, etc., and when the cloth of the present invention is used as a bag filter, sewing becomes easier when the cloth is used as a bag. From this point of view, it is preferable to include a thermoplastic resin or silicone oil having no side chains and branches in the molecular structure. That is, by containing the above-mentioned thermoplastic resin or silicone oil, the coefficient of dynamic friction with the needle is further reduced, and the needle passability is further improved. Examples of the thermoplastic resin having no side chains and branches in the molecular structure include vinyl chloride resin, polyphenylene sulfide resin, nylon 6 resin, polyacetal resin, polyethylene resin, and polytetrafluoroethylene, and among them, nylon 6 resin. , Polyacetal resin, polyethylene resin, polytetrafluoroethylene resin are more preferable, and polytetrafluoroethylene is particularly preferable. The silicone oil is not particularly limited, and examples thereof include dimethyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, methyl phenyl silicone oil, dimethyl silicone oil, and dimethyl silicone oil. ^{The ratio of the content (g / m 2} ) of the components other than graphite to the ^{total mass (g / m 2} ) of the fabric of the present invention is, for example, 0.1 to 5.0% by mass. It is preferably 1.0 to 3.0% by mass. Further, from the viewpoint of further improving the needle-through property and making the folding resistance more excellent when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C., the binder component is contained in the molecular structure. It is preferable to use a thermoplastic resin having no side chains and branches.

The treatment agent containing graphite is composed of a thermoplastic resin (preferably vinyl chloride resin, polyphenylene sulfide resin, nylon 6 resin, polyacetal resin, polyethylene resin and polytetrafluoroethylene resin) having no side chains and branches in the molecular structure. When at least one resin selected from the group) is contained, the mass ratio of graphite and the resin contained in the treatment agent (mass of graphite / mass of resin) is, for example, 0.6 to 3. 0 is preferred, 1.0 to 1.5 is preferred, and 1.1 to 1.5 is more preferred. Further, in the present invention, the treatment agent may contain diethylene glycol as a component other than the above-mentioned graphite.

Further, as a component other than the above-mentioned graphite, the fixability of graphite to the fabric is further improved, and the folding resistance is further improved when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. From the viewpoint, it is preferable that carboxymethyl cellulose is contained. When carboxymethyl cellulose is contained, examples of the mass ratio of graphite to carboxymethyl cellulose (mass of graphite / mass of carboxymethyl cellulose) contained in the treatment agent include 2 to 5. Examples of other components that further improve the fixability include acrylic resin and the like. Further, the treatment agent containing graphite may contain a silicone resin (including silicone oil). Examples of the content of the silicone resin include 0 to 10% by mass and 5 to 10% by mass.

In the present invention, the treatment agent containing graphite has, for example, the content of a silicone resin from the viewpoint of further excellent folding resistance when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. , The mass ratio of graphite contained in the treatment agent to the silicone resin (mass of silicone resin / mass of graphite) can be less than 0.1, 0 or more and 0.05 or less, and silicone. It can also be resin-free.

In the present invention, the treatment agent containing graphite can further contain one or more compounds selected from the group consisting of a silane coupling agent, a hydrolyzate thereof, and a dehydrated condensate of the hydrolyzate. As a result, the folding resistance can be further improved when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C. In the present invention, the silane coupling agent is, for example, 3-glycidoxypropylmethyldiethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2-glycidoxyethoxytrimethoxysilane, 2-. Glycydoxyethyl triethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl)- 3-Aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, N-phenyl-3 -Aminopropyltrimethoxysilane, N- (vinylbenzyl) -2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, vinyltrimethoxysilane, vinyltriethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3- Examples thereof include acryloxipropyltrimethoxysilane, 3-ureidopropyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-isocyanoxidetriethoxysilane and the like.

In the present invention, the content of the silane coupling agent in the treatment agent, one or more compounds selected from the group consisting of the hydrolyzate thereof and the dehydration condensate of the hydrolyzate, is, for example, 5 to 40 mass by mass. %, 5 to 30% by mass is preferably mentioned, 5 to 20% by mass is more preferably mentioned, and 5 to 15% by mass is more preferably mentioned.

In the present invention, the graphite-containing treatment agent can be contained as a graphite-containing treatment agent layer on a cloth made of glass fiber. Further, for example, as shown in FIG. 1, in the present invention, the treatment agent containing graphite may include a portion formed in a film shape covering the glass fiber on at least a part of the glass fiber. FIG. 1 is a scanning electron micrograph showing an example of the content form of the treatment agent contained in the fabric of the present invention, in which the treatment agent layer containing graphite is formed on the glass fiber at least a part of the glass fiber. It is formed in the form of a film so as to cover the above. The amount of the treatment agent containing graphite attached to the entire fabric of the present invention is not particularly limited, but is, for example, 1 to 10% by mass, preferably 1 to 5% by mass. Further, as shown in FIG. 1, in the present invention, it is more preferable that the treatment agent containing graphite is contained on the glass fiber on the surface of the cloth and the inside of the cloth of the present invention.

The fabric of the present invention may contain a catalyst for decomposing gaseous dioxins, NOx and the like to purify the gas as a component other than the treatment agent containing graphite. Examples of the catalyst include known ones, and examples thereof include vanadium pentoxide and the like. Further, a known carrier that supports the catalyst can also be used. As a method for supporting the catalyst on the fabric of the present invention, a known method can be adopted.

The air permeability of the fabric of the present invention includes, for example, 3 to 20 (cc / cm ² / s) and 5 to 15 (cc / cm ² / s) from the viewpoint of achieving both gas permeability and dust collection. s) is preferably mentioned. Further, as the tensile strength of the fabric of the present invention, for example, the warp direction is 1300 N / 25 mm or more, the weft direction is 800 N / 25 mm or more, and the warp direction and the weft direction are preferably 2000 to 6000 N / 25 mm.

The mass of the fabric of the present invention (g / m ^2), is not particularly limited, for example, 500-1500 g / m ² can be mentioned, 700~1100g / m ² is preferred. The thickness (mm) of the fabric of the present invention is not particularly limited, and examples thereof include 0.3 to 1.5 mm, preferably 0.6 to 1.2 mm.

Further, the cloth of the present invention is a cloth made of glass fiber, and since the glass fiber contains a treatment agent containing graphite, it is subjected to an atmospheric temperature exceeding 250 ° C., for example, an atmospheric temperature of 400 ° C. Excellent folding resistance even when exposed to heat. Specifically, as the folding resistance of the fabric of the present invention, the folding resistance measured by the evaluation method 1 shown below is preferably 20,000 times or more in the warp direction and 20,000 times or more in the weft direction, and the warp direction. Is more preferably 20,000 times or more and 30,000 times or more in the weft direction, and particularly preferably 20,000 times or more in the warp direction and 40,000 times or more in the weft direction.

(Evaluation method 1)
The fabric is heat-exposed at 400 ° C. for 24 hours in a muffle furnace and naturally cooled. Measure and calculate with a load of 9.8N.

Specifically, as the folding resistance of the fabric of the present invention, the folding resistance measured by the evaluation method 2 shown below is preferably 300 times or more in the warp direction and 300 times or more in the weft direction. The warp direction is 350 times or more and the weft direction is 400 times or more, and the warp direction is 400 times or more and the weft direction is 500 times or more.

(Evaluation method 2)
When measuring the length of the fabric in the measurement direction (that is, the warp direction when measuring the folding resistance in the warp direction) and the length in a direction different from the measurement direction (that is, when measuring the folding resistance in the warp direction) One piece is cut into a size of 23 cm (in the weft direction), and the cut glass fiber cloth is heat-treated in a high temp oven (trade name HP80 manufactured by Asahi Kagaku Co., Ltd.) at a temperature of 400 ° C. for 24 hours, and then the glass fiber cloth is used. Using a sample that has been naturally cooled, measure and calculate in the weft direction of the sample, with the R of the bending clamp set to 0.38 mm and the load set to 9.8 N, in accordance with JIS R 3420: 2013 7.14.

The fabric of the present invention is preferably used for a dust filter, and particularly preferably for a bag filter. Then, since the cloth of the present invention is excellent in folding resistance even when exposed to heat under the condition of an atmospheric temperature exceeding 250 ° C., for example, an atmospheric temperature of 400 ° C., the cloth of the present invention purifies the above-mentioned gas. If it is used in a temperature range of 300 ° C. or higher and 400 ° C. or lower, which is a preferable temperature range for denitration, it is not necessary to reheat the exhaust gas in the catalytic denitration step that is usually performed after the bug filter, and CO ₂ It is also possible to greatly contribute to the reduction.

The method for producing the fabric of the present invention is not particularly limited. For example, first, a cloth made of glass fiber is prepared. Then, a solution containing a treatment agent containing graphite is prepared, and the treatment agent is attached to the glass fibers constituting the fabric by a known method such as a spray method or a dip method, dried, and the solvent is removed. Therefore, the fabric of the present invention can be obtained.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples.

1. 1. Evaluation method Each example was evaluated by the following method.

(1) Composition and mass ratio (mass%) of the glass composition constituting the glass fiber
Alkaline melting-measured by ICP emission spectroscopy and atomic absorption spectrophotometry.
(2) Glass fiber filament diameter (μm)
Measured and calculated according to JIS R 3420: 2013 7.6.1 A method.
(3) Count (tex) of glass yarn (yarn, bulky yarn, and twisted yarn of yarn and bulky yarn)
Measured and calculated according to JIS R 3420 2013 7.1. Regarding the mass ratio per unit length of the bulky processed yarn and the yarn constituting the combined twisted yarn of the yarn and the bulky processed yarn, 1 m of the combined twisted yarn is collected and the collected twisted yarn is untwisted to bulky. The mass ratio of the bulky processed yarn and the yarn separated into the processed yarn and the yarn was measured and calculated according to JIS R 3420 2013 7.1, and the mass ratio was obtained from each of the obtained values.
(4) Number of twists of yarn and combined twisted yarn of yarn and bulky processed yarn (times / 25 mm)
Measured and calculated according to JIS R 3420: 2013 7.5.
(5) Weaving density of glass fiber woven fabric (book / 25 mm)
Using the obtained fabric, the weaving densities of the warp and weft were measured and calculated according to JIS R 3420 2013 7.9.
(6) Fabric thickness (μm)
Measurements were made to the order of 0.001 mm (1 μm) using a micrometer according to the JIS R 3420 2013 7.10.1A method. This was done for 5 locations, and the average value of the 5 locations was rounded according to JIS Z 8401 Rule B to calculate to the digit of 0.001 mm (1 μm).
(7) Mass of fabric (g / m ² )
Measured and calculated according to JIS R 3420 2013 7.2.
(8) Adhesion amount of treatment agent (% by mass), each composition ratio (parts by mass)
The composition ratio of each treatment agent adhering to the glass fiber was determined from the solid content concentration of each component in the treatment liquid described later. Further, regarding the adhesion amount of the treatment agent, first, the adhesion amount of the components other than graphite of the obtained fabric was measured and calculated according to JIS R 3420: 2013 7.3.2. Then, the adhering amount of the treatment agent for the fabric was calculated from the adhering amount of the obtained components other than graphite and each composition ratio obtained above.
(9) Air permeability of fabric (cc / cm ² / s)
Measured and calculated according to JIS R 3420 7.13.
(10) Folding resistance of fabric I (times)
It was measured and calculated by the evaluation method 1 (heat treatment test I) described above.
(11) Tensile strength of fabric I (N / 25 mm)
According to JIS R 3420: 2013 7.4, the test piece is 250 mm in length and 25 mm in width, and the product name RTC-1310A manufactured by Orientec Co., Ltd. is used as the tensile tester by the constant speed load type tensile test method. It was measured and calculated under the conditions of 150 mm and a speed of 200 mm / min. Regarding the warp direction and the weft direction, the tensile strength of the fabric before and after the heat exposure in the evaluation of (10) above was measured and calculated.
(12) Folding resistance of fabric II (times)
It was measured and calculated by the evaluation method 2 (heat treatment test II) described above.
(13) Tensile strength of fabric II (N / 25 mm)
According to JIS R 3420: 2013 7.4, the test piece is 250 mm in length and 25 mm in width, and the product name RTC-1310A manufactured by Orientec Co., Ltd. is used as the tensile tester by the constant speed load type tensile test method. It was measured and calculated under the conditions of 150 mm and a speed of 200 mm / min. Regarding the warp direction and the weft direction, the tensile strength of the fabric before and after the heat exposure in the evaluation of (12) above was measured and calculated.

2. Glass Composition Constituting the Glass Fibers Used Glass fibers composed of the following glass compositions were used.
(1) Glass composition A: A glass composition in which SiO ₂ is 65.0% by mass, Al ₂ O ₃ is 25.0% by mass, and Mg O is 10.0% by mass. (2) Glass composition B: SiO ₂ Is 61.9% by mass, Al ₂ O ₃ is 19.4% by mass, MgO is 15.3% by mass, and the balance is N ₂ O, K ₂ O, Fe ₂ O ₃ , Ca O _{and B 2 O 3.} Composition (3) Glass composition C: E glass composition (SiO ₂ is 52 to 56% by mass, Al ₂ O ₃ is 12 to 16% by mass, CaO is 15 to 25% by mass, MgO is 0 to 6% by mass. , B ₂ O ₃ is 5 to 13% by mass, and the balance is Na ₂ O ₃ and K ₂ O ₃ )
(3)

3. 3. Description of each embodiment

(Example 1)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name STD410 (bulky processed yarn, filament diameter 5.0 μm, count 410.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition A.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 38/25 mm), caramelizing treatment under the conditions of temperature 680 ° C and time 30 seconds, glass fiber woven fabric Got

Next, the treatment liquid was prepared. The treatment liquid is 100 parts by mass of a graphite dispersion (an aqueous dispersion containing 22.5% by mass of graphite solid content and 7.5% by mass of carboxymethyl cellulose (hereinafter, may be abbreviated as "CMC") solid content). , Polytetrafluoroethylene (hereinafter, may be abbreviated as "PTFE") solution (trade name: PTFE 31-JR, manufactured by Mitsui-Dupont Fluorochemical Co., Ltd., solid content concentration of PTFE: 60% by mass) and 50 parts by mass. , Was obtained by mixing.

The obtained glass fiber woven fabric is impregnated in the above treatment liquid, ^{squeezed with a nip roll to a nip pressure of 1 kgf / cm 2} , and dried in two stages (first stage: temperature 210 ° C., time 15 minutes, second stage: The glass fiber cloth of the present invention was obtained by drying at a temperature of 250 ° C. and a time of 15 minutes).
As shown in FIG. 1, the treatment agent containing graphite contained at least a part of glass fibers on which a film-like portion was formed to cover the glass fibers. Further, the treatment agent containing graphite was contained on the glass fiber on the surface of the cloth and the inside of the cloth of the present invention. The content of graphite in the treatment agent contained on the obtained glass fiber was 37.5% by mass.

(Example 2)
The treatment liquid is 100 parts by mass of a graphite dispersion (water dispersion containing 20% by mass of graphite solid content and 10% by mass of CMC solid content) and a PTFE solution (trade name PTFE 31 manufactured by Mitsui-Dupont Fluorochemical Co., Ltd.). -JR, PTFE had a solid content concentration of 60% by mass) and 50 parts by mass), and the same procedure as in Example 1 was carried out to obtain the glass fiber cloth of the present invention. As in FIG. 1, the treatment agent containing graphite contained at least a part of the glass fiber and a portion formed in the form of a film covering the glass fiber. Further, the treatment agent containing graphite was contained on the glass fiber on the surface of the cloth and the inside of the cloth of the present invention. The content of graphite in the treatment agent contained on the obtained glass fiber was 33.4% by mass.

(Example 3)
The treatment liquid is 100 parts by mass of a graphite dispersion (water dispersion containing 25% by mass of graphite solid content and 5% by mass of CMC solid content) and a PTFE solution (trade name PTFE 31 manufactured by Mitsui-Dupont Fluorochemical Co., Ltd.). -JR, PTFE had a solid content concentration of 60% by mass) and 50 parts by mass), and the same procedure as in Example 1 was carried out to obtain the glass fiber cloth of the present invention. As in FIG. 1, the treatment agent containing graphite contained at least a part of the glass fiber and a portion formed in the form of a film covering the glass fiber. Further, the treatment agent containing graphite was contained on the glass fiber on the surface of the cloth and the inside of the cloth of the present invention. The content of graphite in the treatment agent contained on the obtained glass fiber was 41.7% by mass.

(Example 4)
As warp yarns, trade name D450 6/2 3.8S manufactured by Unitika Co., Ltd. (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), as weft, one unit name STD300 (bulky processed yarn, filament diameter 5.0 μm, count 302.0 tex) and Unitika Co., Ltd. product name D450 3/0 (Filament diameter 5.0 μm, count 33.6 tex) A yarn obtained by combining and twisting one yarn (twist number 2.0 S, count 335.6 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition A.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 47/25 mm), caramelizing treatment under the conditions of temperature 680 ° C and time 30 seconds, glass fiber woven fabric Got

Next, the treatment liquid was prepared. The treatment liquid is 100 parts by mass of a graphite dispersion (water dispersion containing 22.5% by mass of graphite solid content and 7.5% by mass of CMC solid content) and a PTFE solution (trade name manufactured by Mitsui DuPont Fluorochemical Co., Ltd.). It was obtained by mixing PTFE 31-JR and 50 parts by mass of PTFE with a solid content concentration of 60% by mass).

The obtained glass fiber woven fabric is impregnated in the above treatment liquid, ^{squeezed with a nip roll to a nip pressure of 1 kgf / cm 2} , and dried in two stages (first stage: temperature 210 ° C., time 15 minutes, second stage: The glass fiber cloth of the present invention was obtained by drying at a temperature of 250 ° C. and a time of 15 minutes). As in FIG. 1, the treatment agent containing graphite contained at least a part of the glass fiber and a portion formed in the form of a film covering the glass fiber. Further, the treatment agent containing graphite was contained on the glass fiber on the surface of the cloth and the inside of the cloth of the present invention. The content of graphite in the treatment agent contained on the obtained glass fiber was 37.5% by mass.

(Example 5)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name STD410 (bulky processed yarn, filament diameter 5.0 μm, count 410.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition A.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 38/25 mm), caramelizing treatment under the conditions of temperature 680 ° C and time 30 seconds, glass fiber woven fabric Got

Next, the treatment liquid was prepared. The treatment liquid is 25 parts by mass of a graphite dispersion (water dispersion containing 22.5% by mass of graphite solid content and 7.5% by mass of CMC solid content) and a PTFE solution (trade name manufactured by Mitsui DuPont Fluorochemical Co., Ltd.). It was obtained by mixing PTFE 31-JR and 50 parts by mass of PTFE with a solid content concentration of 60% by mass).

The obtained glass fiber woven fabric is impregnated in the above treatment liquid, ^{squeezed with a nip roll to a nip pressure of 1 kgf / cm 2} , and dried in two stages (first stage: temperature 210 ° C., time 15 minutes, second stage: The heat-resistant fiber cloth of the present invention was obtained by drying at a temperature of 250 ° C. and a time of 15 minutes). As shown in FIG. 1, the treatment agent containing graphite contained at least a part of glass fibers on which a film-like portion was formed to cover the glass fibers. Further, the treatment agent containing graphite was contained on the heat-resistant fibers on the surface of the cloth and inside the cloth of the present invention. The content of graphite in the treatment agent contained on the obtained glass fiber was 15.0% by mass.

(Example 6)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name STD410 (bulky processed yarn, filament diameter 5.0 μm, count 410.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition A.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 38/25 mm), caramelizing treatment under the conditions of temperature 680 ° C and time 30 seconds, glass fiber woven fabric Got

Next, the treatment liquid was prepared. The treatment liquid is 10 parts by mass of a graphite dispersion (water dispersion containing 22.5% by mass of graphite solid content and 7.5% by mass of CMC solid content) and a PTFE solution (trade name manufactured by Mitsui DuPont Fluorochemical Co., Ltd.). It was obtained by mixing PTFE 31-JR and 50 parts by mass of PTFE with a solid content concentration of 60% by mass).

The obtained glass fiber woven fabric is impregnated in the above treatment liquid, ^{squeezed with a nip roll to a nip pressure of 1 kgf / cm 2} , and dried in two stages (first stage: temperature 210 ° C., time 15 minutes, second stage: The heat-resistant fiber cloth of the present invention was obtained by drying at a temperature of 250 ° C. and a time of 15 minutes). As shown in FIG. 1, the treatment agent containing graphite contained at least a part of glass fibers on which a film-like portion was formed to cover the glass fibers. Further, the treatment agent containing graphite was contained on the heat-resistant fibers on the surface of the cloth and inside the cloth of the present invention. The content of graphite in the treatment agent contained on the obtained glass fiber was 6.8% by mass.

(Example 7)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name STD410 (bulky processed yarn, filament diameter 5.0 μm, count 410.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition A.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 38/25 mm), caramelizing treatment under the conditions of temperature 680 ° C and time 30 seconds, glass fiber woven fabric Got

Next, the treatment liquid was prepared. The treatment liquid was 50 parts by mass of a graphite dispersion liquid (an aqueous dispersion containing a graphite solid content concentration of 22.5% by mass and a CMC solid content concentration of 7.5% by mass) and a silane coupling agent (trade name manufactured by JNC Co., Ltd.). Sila Ace (registered trademark) S330, non-volatile content 0%) 5 parts by mass, 25% ammonia aqueous solution 0.2 parts by mass, silicone oil (manufactured by Shin-Etsu Chemical Industry Co., Ltd. trade name KM-9739 (non-volatile content 30% by mass)) ) 12 parts by mass, silicone resin (DIC Kita Nihon Polyma Co., Ltd. product name Dick Silicon Softener 500 (nonvolatile content 15% by mass) 0.6 parts by mass, acrylic resin (DIC Co., Ltd. product name DICNAL (registered trademark) E) Mix 5 parts by mass of -8410WH (40% by mass of non-volatile content) and 1.5 parts by mass of a wet penetrant (Kao Co., Ltd. trade name Perex (registered trademark) OT-P (70% by mass of active ingredient)). Obtained by

The obtained glass fiber woven fabric is impregnated in the above treatment liquid, ^{squeezed with a nip roll to a nip pressure of 1 kgf / cm 2} , and dried in two stages (first stage: temperature 210 ° C., time 15 minutes, second stage: The heat-resistant fiber cloth of the present invention was obtained by drying at a temperature of 250 ° C. and a time of 15 minutes). As shown in FIG. 1, the treatment agent containing graphite contained at least a part of glass fibers on which a film-like portion was formed to cover the glass fibers. Further, the treatment agent containing graphite was contained on the heat-resistant fibers on the surface of the cloth and inside the cloth of the present invention. The content of graphite in the treatment agent contained on the obtained glass fiber was 12.6% by mass.

(Example 8)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name STD410 (bulky processed yarn, filament diameter 5.0 μm, count 410.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition A.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 38/25 mm), caramelizing treatment under the conditions of temperature 680 ° C and time 30 seconds, glass fiber woven fabric Got

Next, the treatment liquid was prepared. The treatment liquid was 50 parts by mass of a graphite dispersion (an aqueous dispersion containing 22.5% by mass of a graphite solid content and 7.5% by mass of a CMC solid content) and 0.2 parts by mass of a 25% aqueous ammonia solution. , Silicone oil (trade name KM-9739 manufactured by Shin-Etsu Chemical Industry Co., Ltd. (non-volatile content 30% by mass)) and silicone resin (trade name DIC Silicon Softener 500 manufactured by DIC Kita Nihon Polyma Co., Ltd. (non-volatile content 15% by mass)) 0.6 parts by mass, 5 parts by mass of acrylic resin (trade name DICNAL (registered trademark) E-8410WH (nonvolatile content 40% by mass) manufactured by DIC Co., Ltd.), and wet penetrant (trade name Perex (registered trademark) of Kao Co., Ltd.) ) OT-P (70% by mass of active ingredient)) obtained by mixing with 1.5 parts by mass.

The obtained glass fiber woven fabric is impregnated in the above treatment liquid, ^{squeezed with a nip roll to a nip pressure of 1 kgf / cm 2} , and dried in two stages (first stage: temperature 210 ° C., time 15 minutes, second stage: The heat-resistant fiber cloth of the present invention was obtained by drying at a temperature of 250 ° C. and a time of 15 minutes). As shown in FIG. 1, the treatment agent containing graphite contained at least a part of glass fibers on which a film-like portion was formed to cover the glass fibers. Further, the treatment agent containing graphite was contained on the heat-resistant fibers on the surface of the cloth and inside the cloth of the present invention. The content of graphite in the treatment agent contained on the obtained glass fiber was 13.9% by mass.

(Example 9)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name UTD410 (bulky processed yarn, filament diameter 5.0 μm, count 410.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition B.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 38/25 mm), caramelizing treatment under the conditions of temperature 680 ° C and time 30 seconds, glass fiber woven fabric Got

Next, the treatment liquid was prepared. The treatment liquid was 100 parts by mass of a graphite dispersion (water dispersion containing 22.5% by mass of graphite solid content and 7.5% by mass of CMC solid content) and a PTFE solution (trade name PTFE manufactured by Mitsui DuPont Fluorochemical Co., Ltd.). It was obtained by mixing 31-JR and 50 parts by mass of PTFE with a solid content concentration of 60% by mass).

The obtained glass fiber woven fabric is impregnated in the above treatment liquid, ^{squeezed with a nip roll to a nip pressure of 1 kgf / cm 2} , and dried in two stages (first stage: temperature 210 ° C., time 15 minutes, second stage: The glass fiber cloth of the present invention was obtained by drying at a temperature of 250 ° C. and a time of 15 minutes).
As shown in FIG. 1, the treatment agent containing graphite contained at least a part of glass fibers on which a film-like portion was formed to cover the glass fibers. Further, the treatment agent containing graphite was contained on the glass fiber on the surface of the cloth and the inside of the cloth of the present invention. The content of graphite in the treatment agent contained on the obtained glass fiber was 37.5% by mass.

(Comparative Example 1)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name STD410 (bulky processed yarn, filament diameter 5.0 μm, count 410.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition A.

Using the above warp and weft, weaving with a double weave structure (warp density 48 lines / 25 mm, weft density 38 lines / 25 mm), caramelizing treatment is performed under the conditions of a temperature of 680 ° C. and a time of 30 seconds. A fabric was obtained. The mass of the fabric was 876.5 g / m ² .

(Comparative Example 2)
As warp yarns, trade name D450 6/2 3.8S manufactured by Unitika Co., Ltd. (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), as weft, one unit name STD300 (bulky processed yarn, filament diameter 5.0 μm, count 302.0 tex) and Unitika Co., Ltd. product name D450 3/0 (Filament diameter 5.0 μm, count 33.6 tex) A yarn obtained by combining and twisting one yarn (twist number 2.0 S, count 335.6 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition A.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 47/25 mm), caramelizing treatment is performed under the conditions of a temperature of 680 ° C. and a time of 30 seconds. A fabric was obtained. The mass of the fabric was 839 g / m ² .

(Comparative Example 3)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name STD300 (bulky processed yarn, filament diameter 5.0 μm, count 302.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition B.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 47/25 mm), caramelizing treatment is performed under the conditions of a temperature of 680 ° C. and a time of 30 seconds. A fabric was obtained. The mass of the fabric was 815.9 g / m ² .

(Comparative Example 4)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name TDE300 (bulky processed yarn, filament diameter 6.0 μm, count 302.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition C.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 38/25 mm) was performed to obtain a glass fiber woven fabric.

Next, the treatment liquid was prepared. The treatment liquid was 28 parts by mass of a graphite dispersion liquid (an aqueous dispersion containing a graphite solid content concentration of 22.5% by mass and a CMC solid content concentration of 7.5% by mass) and a silane coupling agent (trade name manufactured by JNC Co., Ltd.). Sila Ace (registered trademark) S330, non-volatile content 0%) 5 parts by mass, 25% ammonia aqueous solution 0.2 parts by mass, silicone oil (manufactured by Shin-Etsu Chemical Industry Co., Ltd. trade name KM-9739 (non-volatile content 30% by mass)) ) 12 parts by mass, silicone resin (DIC Kita Nihon Polyma Co., Ltd. product name Dick Silicon Softener 500 (nonvolatile content 15% by mass) 0.6 parts by mass, acrylic resin (DIC Co., Ltd. product name DICNAL (registered trademark) E) It was obtained by mixing 5 parts by mass of −8410 WH (nonvolatile content 40% by mass) and a wet penetrant (Kao Co., Ltd. trade name Perex (registered trademark) OT-P (active ingredient 70% by mass)).

The obtained glass fiber woven fabric is impregnated in the above treatment liquid, ^{squeezed with a nip roll to a nip pressure of 1 kgf / cm 2} , and dried in two stages (first stage: temperature 210 ° C., time 15 minutes, second stage: It was dried at a temperature of 250 ° C. and a time of 15 minutes) to obtain a heat-resistant fiber cloth of Comparative Example.
As shown in FIG. 1, the treatment agent containing graphite contained at least a part of glass fibers on which a film-like portion was formed to cover the glass fibers. Further, the treatment agent containing graphite was contained on the heat-resistant fibers on the surface of the fabric and the inside of the fabric of the comparative example. The content of graphite in the treatment agent contained on the obtained glass fiber was 31.2% by mass.

(Comparative Example 5)
As the warp, Unitika Ltd. trade name D450 6/2 3.8S (D450 1/0 1Z 6 down-twisted, 2 up-twisted combined yarn, top-twisted 3.8 times / 25 mm, filament diameter 5.0 μm, count 134.4 tex), and as the weft, Unitika Ltd. trade name TDE300 (bulky processed yarn, filament diameter 6.0 μm, count 302.0 tex) was used. The glass composition constituting the glass fiber for both the warp and the weft was the above glass composition C.

Using the above warp and weft, weaving with a double weave structure (warp density 48/25 mm, weft density 38/25 mm) was performed to obtain a glass fiber woven fabric.

Next, the treatment liquid was prepared. The treatment liquid was 50 parts by mass of a graphite dispersion (water dispersion containing 20% by mass of graphite solid content and 10% by mass of CMC solid content) and a silane coupling agent (trade name Syrah Ace (registered trademark) manufactured by JNC Co., Ltd.). ) S330, non-volatile content 0%) 5 parts by mass, 25% ammonia aqueous solution 0.2 parts by mass, silicone oil (trade name KM-9739 manufactured by Shin-Etsu Chemical Industry Co., Ltd. (non-volatile content 30% by mass)) 12 parts by mass And silicone resin (DIC Kita Nihon Polyma Co., Ltd. trade name Dick Silicon Softener 500 (non-volatile content 15% by mass) 0.6 parts by mass) and acrylic resin (DIC Co., Ltd. trade name DICNAL® E-8410WH (non-volatile content) 40% by mass)) 5 parts by mass and a wet penetrant (Kao Co., Ltd. trade name Perex (registered trademark) OT-P (70% by mass of active ingredient)) were mixed.

The obtained glass fiber woven fabric is impregnated in the above treatment liquid, ^{squeezed with a nip roll to a nip pressure of 1 kgf / cm 2} , and dried in two stages (first stage: temperature 210 ° C., time 15 minutes, second stage: It was dried at a temperature of 250 ° C. and a time of 15 minutes) to obtain a heat-resistant fiber cloth of Comparative Example.
As shown in FIG. 1, the treatment agent containing graphite contained at least a part of glass fibers on which a film-like portion was formed to cover the glass fibers. Further, the treatment agent containing graphite was contained on the heat-resistant fibers on the surface of the fabric and the inside of the fabric of the comparative example. The content of graphite in the treatment agent contained on the obtained glass fiber was 42.0% by mass.

4. Evaluation results of fabrics Table 1 shows the evaluation results of the obtained fabrics.

The cloths of Examples 1 to 4 are cloths made of glass fibers, and the glass composition containing a treatment agent containing graphite on the glass fibers and constituting the glass fibers has a SiO ₂ content. 64.0 to 66.0% by mass, Al ₂ O ₃ content 24.0 to 26.0 mass%, Mg O content 9.0 to 11.0%, and other component content 3 mass Since it is less than% (including 0% by mass), it has excellent folding resistance even when exposed to heat under conditions of an atmospheric temperature exceeding 250 ° C., for example, an atmospheric temperature of 400 ° C. In particular, in Example 4, since the weft was a twisted yarn of a bulky processed yarn made of a multifilament yarn and a yarn made of a multifilament yarn, the above-mentioned folding resistance in the weft direction was further excellent. .. In addition, since Examples 1 to 9 contained PTFE resin, which is a thermoplastic resin having no side chain and no branch in the molecular structure, the needle-through property was particularly good. In addition, Examples 1 to 9 had good dust collecting properties.

On the other hand, since Comparative Examples 1 to 3 did not contain a treatment agent containing graphite, they were inferior in folding resistance when exposed to heat under the conditions of an atmospheric temperature exceeding 250 ° C., for example, an atmospheric temperature of 400 ° C. there were. Further, Comparative Examples 1 to 3 were inferior in needle-passability.

Claims (11)

A cloth made of glass fiber
A treatment agent containing graphite is contained on the glass fiber, and the glass fiber is contained.
Carboxymethyl cellulose is contained in the treatment agent, and the treatment agent contains carboxymethyl cellulose.
The fabric is a woven fabric
The glass composition constituting the glass fiber has a SiO ₂ content of 64.0 to 66.0% by mass, an Al ₂ O ₃ content of 24.0 to 26.0% by mass, and an MgO content of 24.0 to 26.0% by mass. 9.0 to 11.0%, content of other components (including 0 mass%.) 3 wt% or less der is,
A glass fiber cloth for a dust collecting filter having a mass of the cloth of 500 to 1500 g / m ^2. A cloth made of glass fiber
A treatment agent containing graphite is contained on the glass fiber, and the glass fiber is contained.
Carboxymethyl cellulose is contained in the treatment agent, and the treatment agent contains carboxymethyl cellulose.
The fabric is a woven fabric
The glass composition constituting the glass fiber is SiO ₂ Content is 64.0 to 66.0% by mass, Al ₂ O ₃ The content of is 24.0 to 26.0% by mass, the content of MgO is 9.0 to 11.0%, and the content of other components is 3% by mass or less (including 0% by mass).
The air permeability of the fabric is 3 to 20 (cc / cm). ² / S), a glass fiber cloth for a dust collecting filter. A cloth made of glass fiber
A treatment agent containing graphite is contained on the glass fiber, and the glass fiber is contained.
Carboxymethyl cellulose is contained in the treatment agent, and the treatment agent contains carboxymethyl cellulose.
The fabric is a woven fabric
The glass composition constituting the glass fiber has a SiO ₂ content of 60.0 to 66.0 mass%, an Al ₂ O ₃ content of 18.0 to 26.0 mass%, and an Mg O content of 18.0 to 26.0 mass%. Ri glass composition der containing 8.0 to 20.0%,
A glass fiber cloth for a dust collecting filter having a mass of the cloth of 500 to 1500 g / m ^2. A cloth made of glass fiber
A treatment agent containing graphite is contained on the glass fiber, and the glass fiber is contained.
Carboxymethyl cellulose is contained in the treatment agent, and the treatment agent contains carboxymethyl cellulose.
The fabric is a woven fabric
The glass composition constituting the glass fiber is SiO ₂ Content is 60.0 to 66.0% by mass, Al ₂ O ₃ A glass composition containing 18.0 to 26.0% by mass and an MgO content of 8.0 to 20.0%.
The air permeability of the fabric is 3 to 20 (cc / cm). ² / S), a glass fiber cloth for a dust collecting filter. The glass fiber cloth for a dust collecting filter according to any one of claims 1 to 4, wherein the treatment agent contains a thermoplastic resin or silicone oil having no side chains and branches in the molecular structure. Weft constituting the front Kio object is a folded and twisted yarn of the yarn made of bulky yarn and multifilament yarn consisting of a multifilament yarn, the dust collecting filter for glass fibers according to any one of claims 1 to 5 Cloth. The glass fiber cloth for a dust collecting filter according to any one of claims 1 to 6 , wherein the content of the graphite in the treatment agent is 30% by mass or more. The glass fiber cloth for a dust collecting filter according to any one of claims 1 to 7 , wherein the folding resistance measured by the following evaluation method is 20,000 times or more in the warp direction and 20,000 times or more in the weft direction.
(Evaluation method)
The fabric is heat-exposed at 400 ° C. for 24 hours in a muffle furnace and naturally cooled. Measure and calculate with a load of 9.8N. The heat-resistant fiber fabric according to any one of claims 1 to 8 , wherein the folding resistance measured by the following evaluation method is 300 times or more in the warp direction and 300 times or more in the weft direction.
(Evaluation method)
When measuring the length of the fabric in the measurement direction (that is, the warp direction when measuring the folding resistance in the warp direction) and the length in a direction different from the measurement direction (that is, when measuring the folding resistance in the warp direction) One piece is cut into a size of 23 cm (in the weft direction), and the cut glass fiber cloth is heat-treated in a high temp oven (trade name HP80 manufactured by Asahi Kagaku Co., Ltd.) at a temperature of 400 ° C. for 24 hours, and then the glass fiber cloth is used. Using a sample that has been naturally cooled, measure and calculate in the weft direction of the sample, with the R of the bending clamp set to 0.38 mm and the load set to 9.8 N, in accordance with JIS R 3420: 2013 7.14. The glass fiber cloth for a dust collecting filter according to any one of claims 1 to 9 , which is for a bag filter. A bag filter comprising the glass fiber cloth for a dust collecting filter according to any one of claims 1 to 10.

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