JPS6366785B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a heat-resistant elastic sheet material comprising ceramic fibers, α-sepiolite, unexpanded vermiculite, and an organic binder, and a method for producing the same. Conventionally, as a composition using unexpanded vermiculite, USP2390732 (hereinafter referred to as conventional example 1) shows a composition in which unexpanded vermiculite is fixed with a binder, and USP2569399
(hereinafter referred to as Conventional Example 2) discloses a composition consisting of unexpanded vermiculite, an asphalt material, an inorganic fiber material, and the like. In Conventional Example 1, the type of binder and whether it is organic or inorganic is unknown, but there is no indication that it is formed into a sheet-like material.
A method of using a mixture of unexpanded vermiculite and a binder is shown in which a thin layer is applied between the walls. In Conventional Example 2, asphalt is used together with unexpanded vermiculite and inorganic fiber materials, but according to experiments by the present inventors, the molded product has elasticity and
It had no flexibility, and it was difficult to maintain its shape at high temperatures of 1000°C or higher. In contrast to the above two conventional examples, the following invention has been proposed as a sheet-like product that uses ceramic fibers, unexpanded vermiculite, an organic binder, or an inorganic binder to impart heat resistance and elasticity. For example, JP-A No. 50-55603 (hereinafter referred to as conventional example 3)
) discloses an expandable sheet material consisting of expandable mica, an inorganic fiber material, and an inorganic binder, and JP-A-51-64483 (hereinafter referred to as Conventional Example 4) discloses an expandable sheet material consisting of expandable mica, an inorganic fiber material, and an inorganic binder. JP-A No. 51-69507 (hereinafter referred to as Conventional Example 5) discloses a filling composition consisting of a material, an inorganic binder, a filler, and a liquid vehicle. A flexible-expandable sheet material consisting of a binder is disclosed, and JP-A-54-30218 (hereinafter referred to as Conventional Example 6) discloses a flexible-expandable sheet material consisting of unexpanded vermiculite, an inorganic fiber material, an organic elastomer binder, an inorganic A flexible expandable sheet material is shown comprising a clay binder. However, according to experiments conducted by the present inventors, the sheet material of Conventional Example 3, which uses an inorganic binder, lacks flexibility and elasticity at room temperature, while the sheet material of Conventional Example 5, which uses an organic binder, lacks flexibility and elasticity at room temperature. It has been found that the material loses its strength at high temperatures as this binder burns out. Furthermore, since the inorganic binder used in the composition of Conventional Example 4 and the sheet material of Conventional Example 6, which used a combination of organic and inorganic binders, is curable, at high temperatures where the organic binder is burned out, The present inventors found through experiments that elasticity and flexibility are lost. Moreover, according to these conventional examples 3 to 5, the inventors of the present invention found through experiments that the sheet-like products produced become extremely brittle at high temperatures. The reason for this is that the content of unexpanded vermiculite used in each case is over 30% by weight.
It is also believed that this is because the inorganic binder used does not have the function of suppressing the free expansion of vermiculite, and therefore becomes extremely brittle at high temperatures where vermiculite expands. As mentioned above, the conventionally proposed sheet materials or compositions using unexpanded vermiculite have the above-mentioned drawbacks in various properties such as elasticity, strength, and flexibility at room temperature and high temperature. However, it had the disadvantage that its uses were greatly restricted. An object of the present invention is to provide a sheet-like product and a method for manufacturing the same that eliminate and improve the drawbacks and disadvantages of the various conventional examples, and to provide a sheet-like product and a method for manufacturing the same as described in the claims. This achieves the above objective. The present invention will be explained in detail below. Ceramic fiber, which is the main constituent material of the present invention, is
Generally, high-purity silica and alumina are electrically melted in approximately equal amounts, and the resulting stream is blown away with high-pressure air or steam to form fibers. This fiber is
Unlike ordinary glass fibers that soften at 200 to 300°C, this fiber has excellent fire resistance and can withstand high temperatures of 1000°C or higher, although it is glassy. Next, α-sepiolite will be explained. α-sepiolite is a type of hydrated magnesium silicate mineral with a double-chain structure, and there are two types depending on its crystallinity. The fibrous type with a high degree of crystallinity is called α-sepiolite, and the type with a low degree of crystallinity or amorphous and lumpy is called β-sepiolite. Since β-sepiolite is in a lumpy form, it does not have the property of intertwining with other materials such as ceramic fibers or unexpanded vermiculite, so conventional sepiolite raw ore consisting of α- and β-sepiolite can be used as is. is α-
Through research, the present inventors have newly discovered that the entanglement is weaker than when only sepiolite is used. Thus, the present inventor found that it is optimal and essential to use α-sepiolite obtained by beneficiation from sepiolite. As shown in Figure 1, this α-sepiolite consists of a Si-O tetrahedral layer 1 and a Mg-O(OH) octahedral layer 2.
The basic crystal structure is a chain structure in which each ribbon is connected by periodic reversal of the apex direction of the tetrahedral layer, based on a talc-like 2:1 layer structure,
It is a fibrous material with well-developed crystals in the C-axis direction and exhibits an outstanding fiber morphology. Furthermore, this α-sepiolite has excellent dispersibility and thickening effect in water or organic solvents, and is extremely flexible in the form of fine fibers, so it intertwines well with various other materials and disperses uniformly with the other materials. When used, it has an excellent effect of strongly bonding with other materials. The chemical composition of α-sepiolite is generally as shown in Table 1, and as can be seen from its chemical composition, it also has excellent heat resistance.

[Table] Next, unexpanded vermiculite will be explained. The unexpanded vermiculite used in the sheet material of the present invention is a vermiculite mineral, and as shown in FIG. Talc-like 2 consisting of 3:
It is a hydrated mineral with a mica-like structure based on a Type 1 layered structure, with layers connected through water. They appear to be irregular plate-like or flaky particles, and have a multilayer structure with water between the layers. When heated, they dehydrate, exfoliate, and expand to 10 to 25 times their original volume, making them look like leeches. It begins to show symptoms. Therefore, expanded vermiculite has properties such as elasticity and heat insulation, but since the bonding strength between the layers of this leech-like multi-layered structure is poor, it easily becomes flaky and falls apart when subjected to external force, and expands. With vermiculite alone, it is difficult to maintain a constant shape consisting of a multi-thin structure. As shown in Table 2, the chemical composition of unexpanded vermiculite is mainly composed of SiO ₂ and MgO, and it is similar in composition to α-sepiolite, but structurally it is similar to the above-mentioned α-sepiolite. While α-sepiolite has a fibrous structure with a multi-chain structure, unexpanded vermiculite has a completely different form, with a plate-like and flaky multi-layered structure.

[Table] Therefore, even in the sheet-like material of the present invention, the effects of the two are completely different, but if the two coexist due to the entangling nature of α-sepiolite, the sheet-like material of the present invention as described above A number of excellent characteristics are manifested. These points will be explained in more detail later. The grain size and the thickness in the a-axis direction of the unexpanded vermiculite used in the present invention will be explained. The expansion coefficient and expansion power of unexpanded vermiculite increase as the particle size increases, but in the production of sheet-like products, vermiculite with a small particle size is usually used because of its good dispersibility. However, according to the present invention, unexpanded vermiculite with a relatively large particle size of 1.19 to 2.83 mm (20 to 9 mesh) is used because α-sepiolite, which has a function to help disperse vermiculite, is used. Therefore, despite containing a small amount of unexpanded vermiculite, the sheet material of the present invention exhibits sufficient expansion and has high elasticity at high temperatures. have Sheets using unexpanded vermiculite with a particle size in the range of 1.19 to 2.83 mm have the above characteristics, but the particle size distribution is somewhat wide, so the difference in expansion rate makes it difficult to use the same blending ratio. There may be slight differences in the expansion coefficient within a single sheet, and the thickness of the sheet after heating and expansion may become somewhat non-uniform. To improve this, the particle size should be 1.19-1.41mm (20-16
The inventors have found that it is optimal to use unexpanded vermiculite within the range of mesh. Furthermore, the present inventors have found that if unexpanded vermiculite with a thickness of 0.11 mm or more in the a-axis direction is selected and used, the thermal expansion coefficient and heating It has been found that it is possible to suppress the decrease in elasticity after expansion. Thus, the unexpanded vermiculite used in the present invention preferably has a grain size in the range of 1.19 to 1.41 mm, and advantageously has a thickness in the a-axis direction of 0.11 mm or more. As the organic binder which is another constituent material of the sheet material of the present invention, it is advantageous to use various latexes such as acrylonitrile butadiene, styrene butadiene, and acrylic esters, polyurethane, vinyl acetate, methylcellulose, and the like. The inventors of the present invention have newly discovered that by using a mixture of these materials, it is possible to produce a sheet-like product having excellent properties. The effects and properties of the sheet-like material obtained by using a mixture of these materials will be explained below. According to Conventional Example 1, a simple knead of unexpanded vermiculite and a binder is applied thinly to the inside of a metal wall, and the material is molded into a sheet-like object, which is the object of the present invention. There is no disclosure regarding physical characteristics. On the other hand, the sheet-like product of the present invention is a sheet-like product that is mainly composed of ceramic fibers and uses the various materials mentioned above, and it can be easily inferred that the strength of the sheet-like product is high even at room temperature and high temperature. The reason for this is that in the sheet material of the present invention, ceramic fibers, unexpanded vermiculite, etc. are well intertwined with highly flexible fibrous α-sepiolite. Conventional Example 2 shows a composition using an asphalt material together with unexpanded vermiculite and an inorganic fiber material, but since asphalt is less flexible at low temperatures, the composition is less flexible at low temperatures. Not only are there extremely few, but 200
℃, the composition begins to soften and further
At high temperatures exceeding 1000°C, asphalt vaporizes, significantly reducing its strength and making it difficult to maintain its shape. On the other hand, the sheet material of the present invention is made by finely and uniformly entwining ceramic fibers and unexpanded vermiculite with α-sepiolite, both of which have heat resistance of 1000°C or higher, and the organic binder is completely burned out. It has sufficient strength and flexibility to handle without any problem even at high temperatures of 1000°C or higher, and in these respects it has various features not found in conventional sheet materials. Further, since the sheet-like material of the present invention uses an organic binder, it has flexibility even at room temperature. When the sheet-like material of the conventional example is press-molded, it not only loses its flexibility but also becomes brittle, but when the sheet-like material of the present invention is press-molded, ceramic fibers, unexpanded vermiculite, and α - The entanglement with sepiolite is loosened to some extent, giving it even greater flexibility.For example, it can not only be rolled into a roll with a radius of 1 cm, but also has a sheet shape that will not crack or break even when folded. Become a thing. On the other hand, the sheet-like products shown in Conventional Examples 3, 5, and 6 are all sheet-like products that aim to have the same properties as the sheet-like product of the present invention, that is, elasticity and heat resistance. The fact that these sheet-like materials only become elastic after being expanded by heating is explained in the publication specification of Conventional Example 3, page 1, line 9, "Has heat resistance and elasticity after expansion...", Conventional Example 5, page 1, line 11 of the specification of the publication, "Has heat resistance and elasticity after expansion...", and the specification of the publication of Conventional Example 6, page 1, line 17
This is clear from the line ``It is heat resistant and has elasticity after expansion...''. However, the sheet-like material of the present invention has a feature that it has great elasticity not only after heating but also before heating. The sheet-like material of the present invention is mainly composed of fine and extremely flexible ceramic fibers and even finer and extremely flexible and elastic α-sepiolite, with a small amount of unexpanded vermiculite added to these. It is manufactured by intertwining each other finely and uniformly, bonding their contact points with an organic binder, and then press molding. Therefore, in addition to the elasticity effect of α-sepiolite itself, the joints between α-sepiolite and other materials are loosened appropriately by pressing, making them flexible. The product has characteristics not found in conventional products, such as vermiculite exhibiting excellent elasticity, compression recovery, and flexibility even in an unexpanded and unheated state. In the publication specification of Conventional Example 5, page 2, lines 17 to 20,
As stated, "We have discovered that it is somewhat inconvenient to use because it is somewhat hard. For this reason, it is difficult to roll the sheet material of the invention (prior art example 3) into a thin roll." The sheet-like material of Example 3 is
It also has the disadvantage of poor flexibility before heating, and in this respect it is significantly different in characteristics from the sheet-like material of the present invention, which has great flexibility resulting from α-sepiolite and press molding. Conventional Examples 5 and 6 show sheet-like products in which only an organic binder is used without using any inorganic binder, or a combination of organic and inorganic binders is used to improve flexibility. There is. Although the sheet-like material shown in Conventional Example 5, which uses only an organic binder, has improved flexibility at room temperature, the organic binder is burned out at high temperatures of 400°C or higher, and at the same time Since the unexpanded vermiculite, which is contained in a large amount by weight or more, expands, the strength of the sheet is significantly reduced and it cannot withstand normal use. In addition, conventional example 6 using a combination of organic and inorganic binders
Although the flexibility of the sheet-like material shown in Figure 1 is improved by an organic binder, the inorganic binder used is a flexible fibrous material such as α-sepiolite in the present invention. Since bentonite is a plate-shaped clay mineral, it cannot be expected to have sufficient flexibility at room temperature. Furthermore, as in Conventional Example 3, the content of unexpanded vermiculite is as high as 40% by weight or more, and furthermore, when bentonite is used, the expansion of vermiculite is not properly suppressed. At high temperatures where the binder burns out, conventional example 5 uses only an organic binder.
Like the sheet-like material, it has the disadvantage that its strength is significantly reduced and it becomes brittle. Therefore, the characteristic of having elasticity after heating expansion as shown in Conventional Examples 3, 5, and 6 is also due to the decrease in the strength of the sheet itself caused by the free expansion of vermiculite. The above-mentioned characteristics may not always be exhibited under conditions in which the sheet-like material can freely expand by heating, for example, under conditions where the sheet-like material can freely expand. In contrast to the conventional examples 3, 4, 5, and 6, the sheet-like product of the present invention is mainly composed of α-sepiolite entangled with ceramic fibers and unexpanded vermiculite, but with unexpanded vermiculite. The content of ulite is extremely small, less than 22% by weight, and even at high temperatures where the organic binder is burned out, α-sepiolite moderately suppresses the free expansion of vermiculite due to its entanglement, significantly reducing the strength of the sheet. It has excellent elasticity and flexibility even at high temperatures due to the effects of α-sepiolite, ceramic fibers, and moderately expanded vermiculite present therein. Furthermore, in the sheet-like product of the present invention, the particle size of the unexpanded vermiculite used is 1.19 to 2.83 mm, preferably 1.19 to 1.41 mm, and the thickness of the particle in the a-axis direction is 0.11 mm or more. Because it is selectively used, it has excellent elasticity even though the content of vermiculite is extremely low at 22% by weight or less. As described above, in the sheet-like product of the present invention, α
-Although the amount of sepiolite used is small, ranging from 5 to 20% by weight, it is understood that it has extremely important functions. In all of Conventional Examples 1 to 6, there is no mention of the use of this α-sepiolite, nor is there any mention of selection regarding the particle size of vermiculite or the thickness of the particles in the a-axis direction. It is clear that the sheet-like material of the conventional example does not have the characteristics of the sheet-like material of the present invention. Next, the reason for limiting the mixing ratio of each material in the sheet-like material of the present invention will be explained. If α-sepiolite is less than 5% by weight, the strength will be insufficient, while if it exceeds 20% by weight, the expansion of vermiculite will be extremely suppressed and the elasticity at high temperatures will be insufficient, so the content should be within the range of 5 to 20% by weight. It is necessary to If the unexpanded vermiculite is less than 5% by weight, it will lack elasticity at high temperatures, while if it exceeds 22% by weight, the strength and elasticity at room temperature will decrease, so it must be within the range of 5 to 22% by weight. There is. If the organic binder is less than 5% by weight, it will lack flexibility at room temperature, while if it exceeds 15% by weight, it will lack strength at high temperatures and elasticity at room temperature, so it should be in the range of 5 to 15% by weight. There is a need to. The sheet-like product of the present invention can improve heat resistance, elasticity at room temperature and high temperature, strength, etc. by changing the mixing ratio of each material within the range of the mixing ratio of each material described in claim 1. Although it is possible to freely change various characteristics, as described above, if the characteristics are outside the limited range, various drawbacks will occur. Therefore, within a limited range, the mixing ratio can be varied depending on the application. For example, when the sheet-like material of the present invention is used as a sealing material, heat resistance and elasticity are particularly required due to the usage conditions, so it is preferable to use the mixing ratio as set forth in claim 2. be. Next, a method for manufacturing the sheet-like article of the present invention will be explained. Pour α-sepiolite powder into the liquid and disperse it to form a slurry with a concentration of 0.01 to 10%. To make this slurry, a high-speed mixer can be used to loosen and disperse up to about 2%, but if the concentration is higher than that, a kneader type that can knead is suitable. Next, a predetermined amount of ceramic fiber, organic binder, and unexpanded vermiculite are added to the slurry in this order, and further stirred.
Mix to ensure uniform dispersion. The slurry thus obtained is made into a paper and then dried. At this time, a known flocculant may be used if necessary for production purposes, such as to improve fixation and freeness. The sheet-like product thus obtained has excellent heat resistance, elasticity, and flexibility. Furthermore, according to the present invention, press molding can be performed to impart superior flexibility to the sheet-like product formed and dried. This press molding is
Either a flat plate press or a roller press may be used, or both may be used in combination. The reason why the sheet-like product of the present invention can be made flexible by press molding is because α-sepiolite, which is flexible and highly elastic, is used, and other inorganic binders are used instead of alpha-sepiolite. When the sheet-like products of Conventional Examples 3 and 6 are subjected to press molding as in the present invention, they become extremely brittle. Next, the present invention will be explained with reference to examples. Example 1 22 g of α-sepiolite was poured into 8000 ml of water, and the flocs were thoroughly opened and dispersed. This slurry contained 198 g of commercially available ceramic fibers, 79 ml of acrylonitrile butadiene latex (solid content 40%), and selected particles with particle sizes within the range of 1.19 to 2.83 mm from commercially available unfired South African vermiculite No. 2. 63 g of unexpanded vermiculite was added in this order and thoroughly stirred and mixed. Add to this 137 ml of a 0.1% solution of commercially available polyacrylamide flocculant and 10% sulfate band.
15 ml of the solution was added and stirred to mix. The slurry thus prepared was made into paper using a square hand paper machine to obtain a paper product with a thickness of 25 mm. 100 pieces of this paper
After drying at ℃, press between stainless steel plates, 30 x 30 cm, thickness 5 mm, bulk density 0.7 g/cm ³
A sheet-like product of the present invention was obtained. Regarding this sheet-like material, the elasticity at room temperature and high temperature shown below,
Conducted strength and flexibility evaluation tests and reported the results in the third
Shown in the table.

【table】

[Table] The elasticity evaluation test at room temperature conducted on the sheet material of the present invention was a test based on the modification method of ASTM F-36-79. This method involves applying a load of 113 kg to a square test piece and measuring the compression ratio and recovery ratio. In addition, the elasticity evaluation test at high temperature is 40% of the original thickness in an atmosphere of 900℃.
In this method, the sheet is compressed repeatedly until the sheet is compressed, the compression and decompression of the sheet is then measured, and the changes resulting from the repeated compression are recorded. The larger the value of this restoring force and the smaller the rate of decrease due to repetition,
The elasticity is evaluated to be excellent. On the other hand, the high-temperature strength evaluation test conducted on the sheet material of the present invention was conducted under the JIS standard at 900℃.
Measured based on P8113. Furthermore, the flexibility evaluation test is a method of measuring the radius of a roll that can be rolled without breaking. Example 2 Selected unexpanded vermiculite was selected from commercially available unsintered South African vermiculite No. 2 using the same blending ratio as in Example 1. Selected unexpanded vermiculite had a particle size within the range of 1.19 to 1.41 mm. Using Urite, a thickness of 5 mm and a bulk density were obtained in the same manner as in Example 1.
A sheet material weighing 0.7 g/cm ³ was obtained. The same measurements as in Example 1 were performed on this sheet-like material, and the results are shown in Table 3. Example 3 Unexpanded vermiculite was selected from commercially available unsintered South African vermiculite No. 2 at the same blending ratio as in Example 1. The particle size was within the range of 1.19 to 1.41 mm, and the particle size in the a-axis direction was A sheet-like product having a thickness of 5 mm and a bulk density of 0.7 g/cm ³ was obtained in the same manner as in Example 1 using selected unexpanded vermiculite having a thickness of 0.11 mm or more. Regarding this sheet-like material, Example 1
The same measurements as above were carried out and the results are shown in Table 3. Example 4 The same materials as in Example 1 were used, including 47 g of α-sepiolite, 205 g of ceramic fiber, 79 ml of latex,
Vermiculite 32g, polyacrylamide 230
ml, 15 ml of sulfuric acid, and 8000 ml of water were formed and pressed in the same manner as in Example 1, and the thickness was 5.0 mm.
A sheet-like product was obtained. Example 2
Pressed in the same manner as above, thickness 5.0mm, bulk density 0.7g/
A sheet material of the present invention having a size of cm ³ was obtained. The same measurements as in Example 1 were performed on this sheet-like material, and the results are shown in Table 3. Example 5 The same materials as in Example 1 were used, including 16 g of α-sepiolite, 221 g of ceramic fiber, 79 ml of latex,
Vermiculite 47g, polyacrylamide 100
ml, 15ml of sulfuric acid, and 8000ml of water were formed and pressed in the same manner as in Example 1 to obtain a thickness of
A sheet-like product of the present invention having a diameter of 5.0 mm and a bulk density of 0.7 g/cm ³ was obtained. The same measurements as in Example 1 were performed on this sheet-like material, and the results are shown in Table 3. Example 6 The same materials as in Example 1 were used, including 16 g of α-sepiolite, 252 g of ceramic fiber, 79 ml of latex,
Vermiculite 16g, polyacrylamide 100
ml, 15 ml of sulfuric acid, and 8000 ml of water were formed and pressed in the same manner as in Example 1, and the thickness was
A sheet-like product of the present invention having a diameter of 5.0 mm and a bulk density of 0.7 g/cm ³ was obtained. The same measurements as in Example 1 were performed on this sheet-like material, and the results are shown in Table 3. Comparative Example 1 Using the same materials as Example 1, 13g of α-sepiolite, 167g of ceramic fiber, 79ml of latex,
Vermiculite 104g, polyacrylamide 100
ml, 15ml of sulfuric acid, and 8000ml of water were formed and pressed in the same manner as in Example 1 to obtain a thickness of
A sheet-like material having a size of 5.0 mm and a bulk density of 0.7 g/cm ³ was obtained. The same measurements as in Example 1 were performed on this sheet-like material, and the results are shown in Table 3. Comparative Example 2 Using the same material as Example 1, ceramic fiber
189g, latex 79ml, vermiculite 95g,
Using 8000 ml of water, paper making and pressing were carried out in the same manner as in Example 1, with a thickness of 5.0 mm and a bulk density of 0.7 g/
A sheet of cm ³ was obtained. The same measurements as in Example 1 were carried out on this sheet-like material, and the results were reported in the third
Shown in the table. Comparative Example 3 Using commercially available unsintered South African No. 2 unexpanded vermiculite with the same blending ratio as in Example 1, and in the same manner as in Example 1, the thickness was 5.0 mm and the bulk density was 0.7 g. /cm ³ sheet-like material was obtained. The same measurements as in Example 1 were performed on this sheet-like material, and the results are shown in Table 3. As can be seen from Table 3, Examples 1 to 1 of the present invention
Each of the sheet-like materials shown in No. 6 has a recovery rate of 90% or more at room temperature, and even at high temperatures, the compression recovery force decreases by only about 17% after 150 repeated compressions.
It had excellent elasticity at both room temperature and high temperature. In addition, the strength at high temperatures was 2 kg/cm ³ or more, which was a great strength that caused no problems in handling. Furthermore, regarding flexibility, the radius is 1 cm at room temperature, and even at high temperatures.
It was found that it can be rolled into a roll of about 10 cm and has excellent flexibility. In contrast to the sheet-like products of Examples 1 to 6, the sheet-like product shown in Comparative Example 1 uses α-sepiolite, but none of them are made of ceramic fibers, α-sepiolite, unexpanded vermiculite, etc. Because the mixing ratio is outside the scope of the present invention,
The strength and elasticity at high temperatures are considerably inferior to those of Examples, and since the sheet-like material of Comparative Example 2 does not contain α-sepiolite, the vermiculite expands greatly and its strength at high temperatures is poor. It was extremely small compared to the example. Moreover, the compression recovery property at room temperature was one-third or less of that of the conventional example. Further, the sheet-like material of Comparative Example 3 was the same as that of Examples 1 to 3.
Because it uses unselected unexpanded vermiculite even though it has the same blending ratio as
Since particles having a particle size smaller than 1.19 mm and a small expansion coefficient were included, the elasticity after heating and expansion was lower than that of the sheet-like materials of the present invention in Examples 1 to 3. Furthermore, when comparing Example 1 and Example 3 of the present invention, the sheet-like material of Example 3 has greater elasticity at high temperatures despite the smaller particle size of unexpanded vermiculite used. I understand that. This is because the sheet material of Example 3 uses selected unexpanded vermiculite whose particles have a relatively thick thickness of 0.11 mm or more in the a-axis direction. As mentioned above, the sheet-like product of the present invention has a structure in which α-sepiolite or ceramic fibers and vermiculite, materials with completely different shapes, are intertwined and further bonded with an organic binder. It is an excellent material that has heat resistance, elasticity, flexibility, strength, etc. not found in other materials, and can be expected to be used in a wide range of applications such as various sealing materials, insulation materials, and fillers.

[Brief explanation of drawings]

FIG. 1 is a model diagram showing the structure of α-sepiolite, and FIG. 2 is a model diagram showing the structure of unexpanded vermiculite.

Claims (1)

[Scope of Claims] 1. A heat-resistant elastic sheet material consisting of 5 to 20% by weight of α-sepiolite, 5 to 22% by weight of unexpanded vermiculite, 5 to 15% by weight of an organic binder, and the remainder substantially consisting of ceramic fibers. 2. A heat-resistant elastic sheet according to claim 1, consisting of 5 to 7% by weight of α-sepiolite, 5 to 22% by weight of unexpanded vermiculite, 8 to 12% by weight of an organic binder, and the remainder substantially consisting of ceramic fibers. something like that. 3 The particle size of unexpanded vermiculite is 1.19 to 2.83
The sheet-like article according to claim 1 or 2, which is within the range of mm. 4 The particle size of unexpanded vermiculite is 1.19 to 1.41
The sheet-like article according to any one of claims 1 to 3, which is within the range of mm. 5 Particle size of unexpanded vermiculite is 1.19 to 1.41
mm, and the thickness in the a-axis direction is 0.11 mm
A sheet-like article according to claim 1 or 2, which is the above. 6 Ceramic fiber, α-sepiolite, unexpanded vermiculite, and organic binder are used as blending raw materials, and their blending ratios are 60 to 85% by weight, 5 to 20% by weight, 5 to 22% by weight, and 5 to 5% by weight, respectively. 15% by weight
Using blended raw materials whose total is 100%, alpha-sepiolite is first defrosted and dispersed in a liquid to form a slurry, and in this slurry, ceramic fibers, an organic binder, and unexpanded A method for producing a heat-resistant elastic sheet material, which comprises adding and mixing vermiculite, forming a paper, and drying the product. 7 The liquid is selected from water and an organic solvent 1
7. The manufacturing method according to claim 6, wherein the liquid is a liquid consisting of one species or two species. 8 Ceramic fiber, α-sepiolite, unexpanded vermiculite, and organic binder are used as blending raw materials, and their blending ratios are 60 to 85% by weight, 5 to 20% by weight, 5 to 22% by weight, and 5 to 5% by weight, respectively. 15% by weight
Using blended raw materials whose total is 100%, alpha-sepiolite is first defrosted and dispersed in a liquid to form a slurry, and in this slurry, ceramic fibers, an organic binder, and unexpanded A method for producing a heat-resistant elastic sheet material, which comprises adding and mixing vermiculite, forming the paper, drying it, and press-forming it. 9 The liquid is selected from water and an organic solvent 1
9. The manufacturing method according to claim 8, wherein the liquid is a liquid consisting of one species or two species.