JP6918464B2 - Plumbing material - Google Patents

Description

The present invention relates to a piping material, and more particularly to a piping material that can be suitably used for a fireproof compartment penetrating portion of a building or the like.

For example, as a piping material that can be suitably used in places where fire resistance is required, such as a part penetrating a fireproof section such as a building, a piping material made of a resin composition containing a synthetic resin as a base resin, an expansion material, and a flame retardant. Is used.

Patent Document 1 describes a refractory expansion layer formed of a refractory resin composition containing 1 to 15 parts by weight of heat-expandable graphite with respect to 100 parts by weight of a polyvinyl chloride resin, and the refractory expansion layer. A multi-layer refractory piping material including a coating layer to be coated is disclosed.

Further, Patent Document 2 describes a pipe joint provided with a socket made of a resin composition containing 0.1 to 1 part by weight of non-thermally expandable graphite with respect to 100 parts by weight of a polyvinyl chloride resin, and a polyvinyl chloride. A piping line in a building is disclosed in which a piping material containing 1 to 10 parts by weight of heat-expandable graphite is connected to 100 parts by weight of the based resin in a section penetrating portion.

Japanese Unexamined Patent Publication No. 2008-180367 (published on August 7, 2008) Japanese Unexamined Patent Publication No. 2009-24411 (published on February 5, 2009)

Although the conventional piping materials as described above have fire resistance, further excellent piping materials are required in terms of fire resistance. Further, as for the conventional pipe joint as described above, a pipe joint capable of more sufficiently exhibiting fire resistance is required.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a piping material having better fire resistance. Another object of the present invention is to provide a pipe joint in which the fire resistance performance is more sufficiently exhibited.

As a result of intensive research to solve the above problems, the present inventors have used a resin composition containing a thermoplastic resin, expanded graphite and zinc phosphate as a piping material to provide piping having better fire resistance. We have found that we can provide materials, and have completed the present invention. That is, the present invention has the following configuration.
[1] A single-layer or multi-layer piping material containing a tubular expanded fire-resistant layer made of a fire-resistant resin composition containing a thermoplastic resin as a base resin, expanded graphite, and zinc phosphate. The fire-resistant resin composition is a piping material containing 1 to 20 parts by weight of expanded graphite and 1 to 15 parts by weight of zinc phosphate with respect to 100 parts by weight of a thermoplastic resin.
[2] The piping material according to [1], wherein at least one of the outside and the inside of the expanded refractory layer is covered with a coating layer.
[3] The piping material according to [1] or [2], wherein the fire-resistant resin composition further contains 1 to 15 parts by weight of heat-resistant aluminum hydroxide with respect to 100 parts by weight of the thermoplastic resin.
[4] The piping material according to any one of [1] to [3], wherein the expansion graphite has a foaming start temperature of 260 ° C. or higher.
[5] The thermoplastic resin is a polyvinyl chloride-based resin, and the fire-resistant resin composition contains more than 15 parts by weight of expanded graphite and less than 20 parts by weight with respect to 100 parts by weight of the polyvinyl chloride-based resin. The piping material according to any one of [1] to [4], which is contained.

The piping material according to the present invention is a piping material containing a tubular expanded fire-resistant layer composed of a thermoplastic resin as a base resin, expanded graphite, and a fire-resistant resin composition containing zinc phosphate. The fire-resistant resin composition is excellent in fire resistance because it contains 1 to 20 parts by weight of expanded graphite and 1 to 15 parts by weight of zinc phosphate with respect to 100 parts by weight of the thermoplastic resin. It has the effect of being.

It is sectional drawing which shows the state which connected the piping material which concerns on one Embodiment of this invention by a pipe joint. It is sectional drawing which shows the state which connected the piping material which concerns on one Embodiment of this invention by a pipe joint.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to this, and various modifications can be made within the scope described, and the present invention also relates to an embodiment obtained by appropriately combining the technical means disclosed in each of the different embodiments. Included in the technical scope of. Unless otherwise specified in the present specification, "A to B" representing a numerical range means "A or more and B or less".

(I) Piping material The piping material according to the present invention is a single layer containing a tubular expanded fire-resistant layer composed of a thermoplastic resin as a base resin, expanded graphite, and a fire-resistant resin composition containing zinc phosphate. Alternatively, it is a multi-layer piping material, and the fire-resistant resin composition contains 1 to 20 parts by weight of expanded graphite and 1 to 15 parts by weight of zinc phosphate with respect to 100 parts by weight of the thermoplastic resin. ..

The piping material may be a single-layer or multi-layer piping material containing the tubular expansion refractory layer. That is, the piping material may be a single-layer piping material composed of only one tubular expansion refractory layer, or one or two other layers may be provided on at least one of the outside and the inside of the expansion refractory layer. It may be a multi-layered piping material having the above. Here, the number and materials of the other layers that the piping material has on at least one of the outside and the inside of the expansion refractory layer may be the same or different between the outside and the inside. In one embodiment of the present invention, in the piping material, at least one of the outside and the inside of the expansion refractory layer is coated with a coating layer. 1 and 2 show a cross-sectional view showing a state in which the piping materials 1, 1 ′, and 1 ″ according to the embodiment of the present invention are connected by a pipe joint 4. The piping materials 1, 1 ′, and 1 ″ shown in FIG. 1 are single-layer piping materials composed of only one tubular expansion refractory layer 2. Further, the piping materials 1, 1 ′, and 1 ″ shown in FIG. 2 are three-layer piping materials in which the outside and the inside of the expansion refractory layer 2 are covered with the coating layer 3.

Since the piping material according to the present invention contains a tubular expanded fire-resistant layer made of a fire-resistant resin composition containing a thermoplastic resin as a base resin, expanded graphite, and zinc phosphate, it is heated by a fire or the like. Then, the pipe wall of the pipe material in the heated portion expands, and the inner diameter of the pipe material is narrowed or the pipe material is closed. This makes it possible to block heat and smoke, or to block flames.

The shape of the pipe material is not particularly limited as long as it is tubular, but in one preferred embodiment, the cross-sectional shape of the pipe is annular. The thickness of the pipe wall of the pipe material may be any thickness as long as it is the thickness of the pipe material usually used for buildings and the like, and is not particularly limited. For example, in the case of a nominal diameter of 100 A, it is 6.6 to 7.6 mm. ..

Further, the inner diameter of the piping material may be any inner diameter of the piping material usually used for buildings and the like, and is not particularly limited. For example, in the case of a nominal diameter of 100A, it is 98.3 to 101.3 mm. The length of the piping material is not particularly limited, and may be appropriately selected depending on the intended use, place of use, and the like.

(I-1) Expanded refractory layer In the present invention, the expanded refractory layer is a tubular layer composed of a thermoplastic resin as a base resin, expanded graphite, and a refractory resin composition containing zinc phosphate. When the expanded refractory layer is heated by a fire or the like, the heated portion expands and the inner diameter of the piping material is narrowed or the piping material is closed. This makes it possible to block heat and smoke, or to block flames.

Since the shape and length of the expanded refractory layer are the same as the shape and length of the piping material, description thereof will be omitted here.

The thickness of the expanded refractory layer is, for example, 2.0 to 7.6 mm in the case of a nominal diameter of 100 A. When the thickness of the expanded refractory layer is 40% or more, more preferably 45% or more, still more preferably 50% or more of the total thickness of the pipe wall of the piping material, the pipe wall is sufficiently expanded by heating to increase the inner diameter. Since it can be closed or shrunk, it has sufficient fire resistance, and it is preferable because it has sufficient strength.

The expanded refractory layer comprises a refractory resin composition containing a thermoplastic resin as a base resin, expanded graphite, and zinc phosphate. Hereinafter, each component contained in the refractory resin composition will be described.

[Base resin]
The refractory resin composition contains a thermoplastic resin as a base resin. The thermoplastic resin is not limited to this, for example, acrylic resin; acrylonitrile-butadiene-styrene resin; polyvinyl chloride resin; polyolefin resin such as polyethylene and polypropylene; poly (1-). Butene-based resin; polypentene-based resin; polystyrene-based resin; polycarbonate-based resin; polyphenylene ether-based resin; polyamide-based resin and the like can be mentioned. As the base resin, the compounds contained in these thermoplastic resins may be used alone or in combination of two or more. Among them, from the viewpoint of excellent moldability, polyvinyl chloride-based resin, acrylonitrile-butadiene-styrene-based resin and the like can be preferably used.

Examples of the polyvinyl chloride-based resin include polyvinyl chloride (PVC), a copolymer of vinyl chloride and another monomer, and a graft copolymer obtained by graft-copolymerizing a vinyl chloride monomer to the polymer. Examples thereof include polymers in which the vinyl chloride unit of these polymers is chlorinated (chlorinated polyvinyl chloride, etc.). These polyvinyl chloride-based resins may be used alone or in combination of two or more. Examples of the other monomer copolymerized with vinyl chloride include α-olefins such as ethylene, propylene and butylene; vinyl esters such as vinyl acetate and vinyl propionate; vinyl ethers such as butyl vinyl ether and cetyl vinyl ether. (Meta) acrylic acid esters such as methyl (meth) acrylate, ethyl (meth) acrylate and butyl acrylate; aromatic vinyls such as styrene and α-methylstyrene; N such as N-phenylmaleimide and N-cyclohexylmaleimide. -Substituted maleimides and the like can be mentioned. These monomers may be used alone or in combination of two or more. Examples of the polymer for graft-copolymerizing a vinyl chloride monomer include an ethylene / vinyl acetate copolymer (EVA), an ethylene-vinyl acetate-carbon monoxide copolymer, and an ethylene-ethyl acrylate copolymer. , Ethylene-butyl acrylate-carbon monoxide copolymer, ethylene-methylmethacrylate copolymer, ethylene-propylene copolymer, acrylonitrile-butadiene copolymer, polyurethane, chlorinated polyethylene, chlorinated polypropylene and the like. .. These polymers may be used alone or in combination of two or more.

[Expanded graphite]
The expanded graphite used in the present invention is not particularly limited as long as it is graphite that has been given expansion characteristics by heat by inserting ions or molecules between layers. Examples of the expanded graphite include GREP-EG (manufactured by Suzuhiro Chemical Co., Ltd.); MZ-260 (manufactured by Air Water Inc.) and the like.

The foaming start temperature of the expanded graphite used in the present invention is preferably 260 ° C. or higher. Here, the "foaming start temperature" is a temperature at which the expansion ratio of the expanded graphite becomes 1.3 or more after heating the expanded graphite sample for 30 minutes with the inside of the heating furnace kept at a constant temperature. The expansion ratio = (volume of the sample after heating / volume of the sample before heating). If the foaming start temperature of the expanded graphite is 260 ° C. or higher and the decomposition temperature of the base resin or lower, when heated by a fire or the like, the heated portion expands before the piping material burns and collapses, and the piping material is heated. Since the inner diameter is narrowed or the piping material is blocked and the temperature inside the pipe is suppressed from rising, the effect of preventing the spread of fire is enhanced. Further, when the foaming start temperature of the expanded graphite is 260 ° C. or higher, the expanded graphite does not foam when the tubular expanded refractory layer is formed from the refractory resin composition, so that a piping material having a better appearance can be obtained. be able to. Further, when the expanded graphite having a low foaming start temperature is used, it is necessary to mold the expanded graphite at a low temperature so that the expanded graphite does not foam, but if the expanded graphite is molded at a low temperature, the performance of the expanded refractory layer may deteriorate. When the foaming start temperature of the expanded graphite is 260 ° C. or higher, a more suitable molding temperature can be selected without impairing the appearance of the obtained piping material.

The proportion of expanded graphite contained in the refractory resin composition is not particularly limited as long as the fire resistance of the piping material can be improved, but 100 parts by weight of the thermoplastic resin contained in the refractory resin composition. On the other hand, it is more preferably 1 to 20 parts by weight, and further preferably 11 to 18 parts by weight.

If the proportion of expanded graphite contained in the refractory resin composition is 20 parts by weight or less with respect to 100 parts by weight of the thermoplastic resin contained in the refractory resin composition, the expanded refractory layer is excessive due to heating. Does not swell. Therefore, it is possible to avoid the problem of the residue falling off caused by the expansion refractory layer being unable to retain its shape in the piping material due to excessive expansion. When the ratio of the expanded graphite is 1 part by weight or more, the expanded refractory layer can be expanded by heating such as a fire to narrow the inner diameter of the piping material of the piping material or block the piping material. It is preferable because it can be done.

When the thermoplastic resin is a polyvinyl chloride-based resin, the ratio of expanded graphite contained in the fire-resistant resin composition is based on 100 parts by weight of the polyvinyl chloride-based resin contained in the fire-resistant resin composition. It is particularly preferable that the amount is more than 15 parts by weight and less than 20 parts by weight. When the ratio of the expanded graphite is more than 15 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin, the expanded refractory layer expands greatly and the blockage of the piping material is increased, which is preferable.

[Zinc phosphate]
The zinc phosphate used in the present invention is not particularly limited, and examples thereof include zinc ethylenediamine phosphate. As the zinc ethylenediamine phosphate, for example, those described in JP-A-2000-191674 and the like can be used, but the zinc is not particularly limited thereto. As the zinc phosphate, for example, ZPO-3 (manufactured by Suzuhiro Chemical Co., Ltd.) and the like can be preferably used.

In the conventional technique of using a refractory expansion layer formed of a resin composition containing expanded graphite in a polyvinyl chloride resin as a piping material, when the content of expanded graphite increases, the structure expands too much due to heating. There was a problem that the shape could not be maintained. That is, it was considered that there is a limit to increasing the proportion of expanded graphite in order to improve the blockage of the piping material during heating. In response to this problem, the present inventors added expanded graphite and zinc phosphate to a thermoplastic resin as a base resin, and surprisingly increased the content of expanded graphite to a polyvinyl chloride-based resin. It has been found that the shape can be maintained even if the structure is greatly expanded by heating by adding more than 15 parts by weight with respect to 100 parts by weight.

The proportion of zinc phosphate contained in the refractory resin composition is not particularly limited as long as the shape of the expanded refractory layer can be maintained during heating, but the thermoplastic resin contained in the refractory resin composition. It is preferably 1 to 15 parts by weight, more preferably 3 to 12 parts by weight, and further preferably 5 to 10 parts by weight with respect to 100 parts by weight.

When the ratio of zinc phosphate contained in the fire-resistant resin composition is 1 part by weight or more with respect to 100 parts by weight of the thermoplastic resin, the shape of the expanded fire-resistant layer can be maintained at the time of heating, which is preferable. .. When the ratio of zinc phosphate is 15 parts by weight or less, it is preferable because the physical properties of the piping material are good.

When the thermoplastic resin is a polyvinyl chloride resin, the proportion of zinc phosphate contained in the fire resistant resin composition is 100 parts by weight of the polyvinyl chloride resin contained in the fire resistant resin composition. On the other hand, it is preferably 1 to 15 parts by weight, more preferably 3 to 12 parts by weight, and most preferably 5 to 10 parts by weight. When the ratio of zinc phosphate contained in the refractory resin composition is 1 part by weight or more with respect to 100 parts by weight of the polyvinyl chloride resin, the shape of the expanded refractory layer can be maintained during heating. preferable. When the ratio of zinc phosphate is 15 parts by weight or less, it is preferable because the physical properties of the piping material are good.

[Other ingredients]
The refractory resin composition may indispensably contain a thermoplastic resin as a base resin, expanded graphite, and zinc phosphate, but further, as long as the performance of the refractory expansion layer or the piping material is not impaired. It may contain other components. From the viewpoint of not impairing the performance of the refractory expansion layer or the piping material, the total content of other components with respect to 100 parts by weight of the refractory resin composition is preferably 20 parts by weight or less, more preferably 15 parts by weight. It is as follows.

Examples of the other components include flame retardants, shape-retaining agents, processing aids, stabilizers, pigments and the like.

Examples of the flame retardant include heat-resistant aluminum hydroxide, magnesium hydroxide, hydrotalcite, antimony dioxide, antimony trioxide, antimony trioxide, and other molybdenum compounds such as molybdenum trioxide, molybdenum disulfide, and ammonium molybdate. , Tetrabromobisphenol A, tetrabromuetane, tetrabromuetane, tetrabromuetane and other bromine compounds, triphenylphosphate, ammonium polyphosphate, melamine pyrophosphate and other phosphorus compounds, calcium borate, zinc borate And so on. In a preferred embodiment of the present invention, the fire-resistant resin composition uses heat-resistant aluminum hydroxide as a flame retardant in addition to a thermoplastic resin as a base resin, expanded graphite, and zinc phosphate. .. When the present inventors used heat-resistant aluminum hydroxide as a flame retardant in addition to a thermoplastic resin as a base resin, expanded graphite, and zinc phosphate, they were not only flame-retardant but also a fire-resistant expansion layer. It was found that the shape stability of the aluminum during expansion was remarkably improved. More specific examples of the heat-resistant aluminum hydroxide include ALH-3L (manufactured by Kawai Lime Industry Co., Ltd.).

The ratio of the heat-resistant aluminum hydroxide contained in the fire-resistant resin composition is not particularly limited, but is 1 to 15 weight by weight with respect to 100 parts by weight of the thermoplastic resin contained in the fire-resistant resin composition. It is preferably parts, more preferably 3 to 12 parts by weight, and most preferably 5 to 10 parts by weight.

If the ratio of the heat-resistant aluminum hydroxide contained in the refractory resin composition is 1 part by weight or more with respect to 100 parts by weight of the thermoplastic resin contained in the refractory resin composition, the flame retardancy alone is sufficient. It is preferable because the shape stability of the refractory expansion layer at the time of expansion is improved, and when it is 15 parts by weight or less, the physical properties of the piping material are good, which is preferable.

When the thermoplastic resin is a polyvinyl chloride resin, the proportion of the heat-resistant aluminum hydroxide contained in the fire-resistant resin composition is the polyvinyl chloride resin 100 contained in the fire-resistant resin composition. It is preferably 1 to 15 parts by weight, more preferably 2 to 12 parts by weight, and most preferably 4 to 10 parts by weight with respect to parts by weight.

Further, it is more preferable to add calcium carbonate or alumina as an additive because the shape retention is improved.

[Manufacturing method of expanded refractory layer]
The method for producing the expandable refractory layer is not particularly limited, and includes a step of mixing a thermoplastic resin as a base resin, expanded graphite, zinc phosphate, and if necessary, the other components. It may include a step of forming the mixed refractory resin composition into a tubular shape.

Further, the method of molding the mixed refractory resin composition into a tubular shape is not particularly limited, and examples thereof include extrusion molding and injection molding.

(I-2) Coating Layer In one embodiment of the piping material of the present invention, at least one of the outside and the inside of the expansion refractory layer is coated with a coating layer. The coating layer is provided, for example, from the viewpoint of mechanical strength, weather resistance, chemical resistance, and the like.

The coating layer is preferably a layer containing a thermoplastic resin. The resin is not particularly limited to this, and examples thereof include an acrylic resin, an ABS resin, and a polyvinyl chloride resin. These thermoplastic resins may be used alone or in combination of two or more. From the viewpoint of weather resistance and chemical resistance, the coating layer is more preferably a layer containing a polyvinyl chloride resin.

As the polyvinyl chloride-based resin used for the coating layer, the same resin as the polyvinyl chloride-based resin described in the section [Base resin] of (I-1) can be used.

The thickness of the coating layer is also not particularly limited, but for example, in the case of a nominal diameter of 100 A, it is preferably 0.1 mm to 3 mm, more preferably 0.2 mm to 2.8 mm, and further preferably 0. It is 5 mm to 2 mm. It is more preferable that the thickness of the coating layer is 0.5 mm or more because the mechanical strength of the piping material can be improved. Further, when the thickness of the coating layer is 2 mm or less, the thickness of the expanded refractory layer can be secured and the refractory resistance is good, which is more preferable. The thickness of the coating layer means the thickness of each coating layer when the coating layer is provided on the outside and the inside of the expansion refractory layer.

The method of coating at least one of the outer side and the inner side of the expanded refractory layer with a coating layer is not particularly limited, and examples thereof include multi-layer extrusion molding and coating.

(II) Connection of Piping Material The piping material according to the present invention is usually used by connecting two or three or more by a pipe joint. The shape and size of the pipe joint are not particularly limited as long as the shape and size can connect the pipe material. Hereinafter, an example of a method of connecting the piping material according to the present invention by the pipe joint will be described with reference to FIGS. 1 and 2.

FIG. 1 is a cross-sectional view showing a state in which single-layer piping materials 1, 1 ″ and 1 ″ according to an embodiment of the present invention are connected by a pipe joint 4. Further, FIG. 2 is a cross-sectional view showing a state in which the three layers of piping materials 1, 1 ″ and 1 ″ according to the embodiment of the present invention are connected by a pipe joint 4. As shown in FIGS. 1 and 2, the pipe joint 4 includes a main pipe portion having vertical pipe connecting portions 4a and 4b to which the vertical pipe pipe materials 1 and 1'are connected, respectively, and a horizontal branch pipe pipe material 1''. It is provided with a lateral branch pipe portion having a lateral branch pipe connecting portion 4c to be connected. The main pipe part has a tubular shape having substantially the same inner diameter as the vertical pipe piping materials 1 and 1', and the lateral branch pipe portion has a tubular shape having substantially the same inner diameter as the horizontal branch pipe material 1''. Have. And in the example shown in FIGS. This is a socket into which a horizontal branch pipe piping material 1'' is inserted and connected.

In the examples shown in FIGS. 1 and 2, the pipe joint is configured to connect three piping materials, but may be configured to connect two or four or more piping materials.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples. The expandability and shape retention in the following examples were evaluated by the following methods.
(Expandability)
From the obtained piping material having an outer diameter of 22 mm and an inner diameter of 16 mm, a test piece was cut out to a size of 50 mm in the axial direction. The test piece was placed in a crucible and heated to 1000 ° C. in a heating furnace, and the volume of the residue remaining in the crucible was measured. When the ratio of the volume of the residue to the volume of the test piece before being placed in the heating furnace is 5 times or more, it is "◎", when it is 4 times or more and less than 5 times, it is "○", and when it is less than 4 times. It was evaluated as "x".
(Shape retention)
A predetermined compressive force was applied to the residue remaining in the crucible, and it was confirmed whether the residue did not collapse. The case where the residue did not collapse was evaluated as “⊚”, the case where a small part of the residue collapsed was evaluated as “◯”, the case where a part of the residue collapsed was evaluated as “Δ”, and the case where most of the residue collapsed was evaluated as “×”.

(Appearance (foaming during molding))
Observe the obtained piping material, "◎" when there is no foaming, "○" when a small amount of small bubbles are generated, when a large amount of small bubbles are generated, or when large bubbles are generated. The case was evaluated as "x".

[Example 1]
The fire-resistant resin composition constituting the expansion fire-resistant layer consists of 100 parts by weight of PVC (Kaneka Corporation, Kaneka Vinyl S1001), 6 parts by weight of a lead-based stabilizer (Mizusawa Chemical Industry Co., Ltd., Stabinex), and a processing aid (processing aid). Kaneka Corporation, PA-60) 5 parts by weight, zinc phosphate (Suzuhiro Chemical Industry Co., Ltd., ZPO-3) 10 parts by weight, expanded graphite (Air Water Co., Ltd., MZ-260) 11 parts by weight, and hydroxide After blending 5 parts by weight of magnesium (Kyowa Chemical Industry Co., Ltd., Kisma 5A), it was obtained by stirring and mixing with a mixer.

The obtained refractory resin composition was molded into a tubular shape by an extrusion molding machine to prepare a single-layer piping material composed of an expanded refractory layer. The thickness of the obtained piping material was 3 mm, and the inner diameter was 16 mm.

[Example 2]
In the formulation of the refractory resin composition constituting the expanded refractory layer, a piping material was produced in the same manner as in Example 1 except that expanded graphite (MZ-260 manufactured by Air Water Inc.) was made up to 5 parts by weight. ..

[Example 3]
As a fire-resistant resin composition constituting the expansion fire-resistant layer, 100 parts by weight of PVC (Kaneka Corporation, Kaneka Vinyl S1001), 6 parts by weight of a lead-based stabilizer (Mizusawa Chemical Co., Ltd., Stabinex), and a processing aid (processing aid) Kaneka Corporation, PA-60) 5 parts by weight, zinc phosphate (Suzuhiro Chemical Co., Ltd., ZPO-3) 5 parts by weight, expanded graphite (Air Water Co., Ltd., MZ-260) 11 parts by weight, and heat-resistant water A piping material was produced in the same manner as in Example 1 except that 5 parts by weight of aluminum oxide (manufactured by Kawai Lime Industry Co., Ltd., ALH-3L) was blended.

[Example 4]
A piping material was produced in the same manner as in Example 1 except that 5 parts by weight of zinc phosphate (manufactured by Suzuhiro Chemical Co., Ltd., ZPO-3) was blended as the refractory resin composition constituting the expanded refractory layer.

[Example 5]
Piping material in the same manner as in Example 4 except that 5 parts by weight of aluminum hydroxide (manufactured by Nippon Light Metal Co., Ltd., BF013) was added instead of magnesium hydroxide as the refractory resin composition constituting the expanded refractory layer. Was produced.

[Example 6]
Piping material in the same manner as in Example 4 except that 5 parts by weight of an alumina-based filler (Cerasur BMT-33, manufactured by Kawai Lime Industry Co., Ltd.) was additionally added as a refractory resin composition constituting the expanded refractory layer. Was produced.

[Example 7]
In the formulation of the refractory resin composition constituting the expanded refractory layer, instead of 5 parts by weight of heat-resistant aluminum hydroxide (manufactured by Kawai Lime Industry Co., Ltd., ALH-3L), magnesium hydroxide (manufactured by Kyowa Chemical Industry Co., Ltd., Kisma 5A) A piping material was produced in the same manner as in Example 3 except that 5 parts by weight and 5 parts by weight of calcium carbonate (Shiraishi Kogyo Co., Ltd., Whiten P) were blended.

[Example 8]
A piping material was produced in the same manner as in Example 3 except that 5 parts by weight of calcium carbonate (manufactured by Shiraishi Kogyo Co., Ltd., Whitenton P) was additionally added in the formulation of the refractory resin composition constituting the expanded refractory layer. ..

[Example 9]
Piping material in the same manner as in Example 3 except that 4.5 parts by weight of a lead-based stabilizer (manufactured by Mizusawa Industrial Chemicals, Stabinex) was blended in the blending of the refractory resin composition constituting the expanded refractory layer. Was produced.

[Example 10]
A piping material was produced in the same manner as in Example 9 except that 16 parts by weight of expanded graphite (MZ-260 manufactured by Air Water Inc.) was blended in the blending of the refractory resin composition constituting the expanded refractory layer. ..

[Example 11]
A piping material was produced in the same manner as in Example 10 except that 7 parts by weight of zinc phosphate (manufactured by Suzuhiro Chemical Co., Ltd., ZPO-3) was blended in the blending of the refractory resin composition constituting the expanded refractory layer. did.

[Example 12]
In the formulation of the refractory resin composition constituting the expanded refractory layer, the piping material is the same as in Example 11 except that 7 parts by weight of heat-resistant aluminum hydroxide (ALH-3L, manufactured by Kawai Lime Industry Co., Ltd.) is blended. Was produced.

[Example 13]
A piping material was produced in the same manner as in Example 10 except that 20 parts by weight of expanded graphite (MZ-260 manufactured by Air Water Inc.) was blended in the blending of the refractory resin composition constituting the expanded refractory layer. ..

[Example 14]
A piping material was produced in the same manner as in Example 13 except that 9 parts by weight of zinc phosphate (manufactured by Suzuhiro Chemical Co., Ltd., ZPO-3) was blended in the blending of the refractory resin composition constituting the expanded refractory layer. did.

[Example 15]
In the formulation of the refractory resin composition constituting the expansion refractory layer, the piping material is the same as in Example 14 except that 9 parts by weight of heat-resistant aluminum hydroxide (ALH-3L, manufactured by Kawai Lime Industry Co., Ltd.) is blended. Was produced.

[Example 16]
A piping material was produced in the same manner as in Example 4 except that magnesium hydroxide was not added in the formulation of the refractory resin composition constituting the expanded refractory layer.

[ Reference example 1 ]
A piping material was produced in the same manner as in Example 9 except that 11 parts by weight of expanded graphite (GREP-EG, manufactured by Suzuhiro Chemical Co., Ltd.) was blended in the blending of the refractory resin composition constituting the expanded refractory layer. ..

[ Reference example 2 ]
A piping material was produced in the same manner as in Example 16 except that 11 parts by weight of expanded graphite (GREP-EG, manufactured by Suzuhiro Chemical Co., Ltd.) was blended in the blending of the refractory resin composition constituting the expanded refractory layer. ..

[Example 17 ]
In the formulation of the refractory resin composition constituting the expanded refractory layer, 5 parts by weight of zinc phosphate (manufactured by Suzuhiro Chemical Co., Ltd., ZPO-3) was changed to 2.5 parts by weight, and melamine pyrophosphate (MPP) was added. A piping material was produced in the same manner as in Example 9 except that it was blended.

[Comparative Example 1]
As a fire-resistant resin composition constituting the expansion fire-resistant layer, 100 parts by weight of PVC (Kaneka Corporation, Kaneka Vinyl S1001), 6 parts by weight of a lead-based stabilizer (Mizusawa Chemical Co., Ltd., Stabinex), and a processing aid (processing aid) Kaneka Corporation, PA-60) 5 parts by weight, ammonium polyphosphate (Suzuhiro Chemical Co., Ltd., FCP-APP) 5 parts by weight, and expanded graphite (Suzuhiro Chemical Co., Ltd., GREP-EG) 11 parts by weight were blended. Except for the above, a piping material was produced in the same manner as in Example 1.

[Comparative Example 2]
In the formulation of the refractory resin composition constituting the expanded refractory layer, the piping material was prepared in the same manner as in Comparative Example 1 except that 5 parts by weight of magnesium hydroxide (Kyowa Chemical Industry Co., Ltd., Kisma 5A) was additionally added. Made.

[Comparative Example 3]
A piping material was produced in the same manner as in Comparative Example 1 except that 5 parts by weight of aluminum hydroxide (manufactured by Nippon Light Metal Co., Ltd., BF013) was additionally added in the formulation of the refractory resin composition constituting the expanded refractory layer. ..

[Comparative Example 4]
As a fire-resistant resin composition constituting the expansion fire-resistant layer, 100 parts by weight of PVC (Kaneka Corporation, Kaneka Vinyl S1001), 6 parts by weight of a lead-based stabilizer (Mizusawa Industrial Chemicals, Stabinex), and a processing aid (processing aid) A piping material was produced in the same manner as in Example 1 except that 5 parts by weight of PA-60) manufactured by Kaneka Corporation and 5 parts by weight of zinc phosphate (manufactured by Suzuhiro Chemical Co., Ltd., ZPO-3) were blended.

[Comparative Example 5]
Examples in the formulation of the refractory resin composition constituting the expanded refractory layer, except that ammonium polyphosphate (manufactured by Suzuhiro Chemical Co., Ltd., FCP-APP) was additionally added by 5 parts by weight and zinc phosphate was not added. A piping material was produced in the same manner as in 1.

[Comparative Example 6]
In the formulation of the refractory resin composition constituting the expanded refractory layer, except that the blending amount of zinc phosphate (manufactured by Suzuhiro Chemical Co., Ltd., ZPO-3) was changed from 10 parts by weight to 20 parts by weight, the same as in Example 1. In the same manner, a piping material was produced.

[Comparative Example 7]
A piping material was produced in the same manner as in Example 1 except that zinc phosphate was not blended in the blending of the refractory resin composition constituting the expanded refractory layer.

[Evaluation of expandability and shape retention]
The piping materials obtained in Examples 1 to 17 and Comparative Examples 1 to 7 were evaluated for expandability and shape retention. The results are shown in Tables 1 and 2.

The present invention can be used in places where fire resistance is required in pipelines, such as fire protection sections of buildings and the like.

1, 1', 1 "Piping material 2 Expansion refractory layer 3 Coating layer 4 Pipe joint 4a, 4b Standing pipe connection part 4c Horizontal branch pipe connection part

Claims (4)

A single-layer or multi-layer piping material containing a tubular expanded refractory layer made of a refractory resin composition containing a thermoplastic resin as a base resin, expanded graphite, and zinc phosphate.
The refractory resin composition contains 5 to 20 parts by weight of expanded graphite and 2.5 to 10 parts by weight of zinc phosphate with respect to 100 parts by weight of the thermoplastic resin.
The thermoplastic resin is, A acrylonitrile - butadiene - styrene resin, polyvinyl chloride resin, Po Li (1) butene resins and polypentene based resin thermoplastic resin from fat or Ranaru group is at least one selected And
A piping material characterized in that the foaming start temperature of the expanded graphite is 260 ° C. or higher and lower than the decomposition temperature of the base resin. The piping material according to claim 1, wherein at least one of the outer side and the inner side of the expanded refractory layer is covered with a coating layer. The piping material according to claim 1 or 2, wherein the fire-resistant resin composition further contains 5 to 9 parts by weight of heat-resistant aluminum hydroxide with respect to 100 parts by weight of the thermoplastic resin. The thermoplastic resin is a polyvinyl chloride resin,
The pipe according to any one of claims 1 to 3, wherein the refractory resin composition contains 16 to 20 parts by weight of expanded graphite with respect to 100 parts by weight of the polyvinyl chloride resin. Material.

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