JP2012007728A - Fire resistance piping system, and piping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire resistance piping system which is excellent in fire resistant performance and favorable in physical property, and can be easily colored, and also excellent in recyclability.SOLUTION: The fire resistance piping system includes at least fire resistance piping material and a fire resistance piping fitting. The fire resistance piping material contains a polyvinyl chloride based resin, at least one selected from a group composed of a Ca-Zn based thermostabilizer, an Mg-Zn based thermostabilizer and a Ca-Mg-Zn based thermostabilizer, and a synthetic hydrotalcite compound. The fire resistance piping system is formed using a resin composition A comprising the synthetic hydrotalcite compound in the range of 2 or more pts.mass to 12 or less to 100 pts.mass of the polyvinyl chloride based resin. The fire resistance piping fitting is formed by using a resin composition B composed of the polyvinyl chloride based resin and a calcium carbonate.

Description

  The present invention relates to a fireproof piping system, and more particularly, to a fireproof piping system formed by piping a piping material or the like that is provided with fire resistance for a piping material installed in a building.

  When installing pipes (conduit pipes, drain pipes, ducts, etc.) in a building, provide through holes (compartment penetrating parts) that penetrate the pipes, etc., in partition parts such as floors, walls, and partitions of buildings. A fire-resistant construction method is adopted in which the gap is closed with mortar or the like so that the gap is not formed between the compartment penetration and the pipe after the pipe is passed through the compartment penetration.

  When the piping material is made of metal, it has heat resistance and nonflammability, so there is no particular problem with the above-mentioned fireproofing method, but when the piping material is made of synthetic resin, it is made of metal. Although it has the advantages of being lightweight and excellent in handleability, it has the disadvantage of being inferior in heat resistance. Therefore, in the piping material made of synthetic resin, it is burned down or thermally deformed due to combustion in the event of a fire, creating a gap in the partition through part, creating a through hole, heat generated on one side of the partition, flame, smoke, etc. May reach the other side.

  Examples of raw materials mainly used for synthetic resin piping materials include vinyl chloride resins, polyethylene, and polypropylene. Generally, heat stabilizers are used for piping materials made of vinyl chloride resin, and various heat stabilizers exist as heat stabilizers to be used. The most commonly used heat stabilizer is a lead-based heat stabilizer, which is advantageous in terms of moldability and raw material costs. By the way, it is necessary to use piping materials that do not elute lead, which is a harmful substance, for water supply applications. Thermal stabilizers or tin-based thermal stabilizers are used. Ca-Zn-based heat stabilizer, Ba-Zn-based heat stabilizer, Mg-Zn-based heat stabilizer, or tin-based heat stabilizer is more expensive than lead-based heat stabilizer, and has poor moldability. Therefore, it is not used for purposes other than water supply, but is used for special purposes for water supply.

  As a fireproof piping material, a fireproof piping material in which a fireproof coating layer such as aluminum glass cloth or mortar is laminated on the outer surface of a synthetic resin piping material is known (for example, see Patent Document 1). However, since this fireproof piping material is formed by compounding different materials, continuous molding is difficult and there is a problem that productivity is inferior. In addition, the fire-resistant piping material whose outer surface is covered with mortar has a problem that it is inferior in workability during transportation and construction because the weight becomes very heavy.

  On the other hand, a fire-resistant construction method is also employed in which a sheet-like covering material having fire-resistant expansibility is wrapped around the outer surface of a synthetic resin piping material. However, in the case of such a fireproofing method using a sheet-shaped covering material, first, a synthetic resin piping material is temporarily piped to position the portion around which the sheet-shaped covering material is wound, and then the sheet-shaped covering material Is wrapped around the piping material to support and fix the piping material, and then the opening is backfilled with mortar, which requires a lot of work and a long construction time, and the sheet-like coating material is wound around the piping material. After that, there is a problem that it is difficult to adjust the position of the piping.

  In order to solve the above problems, a technique is disclosed in which a resin composition having fire expansion properties is used as a piping material itself or a plugging material for a through portion. For example, as a plugging material for the penetrating part of the fireproof compartment, a heat-expandable graphite as an inorganic expansion agent is blended with a base resin such as rubber, thermoplastic elastomer, or liquid polymer, and a polycarbonate resin or A fire-resistant expandable resin composition containing a polyphenylene sulfide resin or the like is known (for example, see Patent Document 2), and a thermoplastic compound such as polyvinyl chloride, a phosphorus compound, a heat-expandable graphite, and A resin composition containing a large amount of an inorganic filler (for example, see Patent Document 3) is known.

  However, since the former fire-resistant intumescent resin composition uses rubber, thermoplastic elastomer, liquid polymer or the like as a base resin, there is a problem that the obtained piping material is inferior in mechanical strength.

  On the other hand, the resin composition disclosed in the latter patent document 3 is excellent in flame retardancy, but is inferior in moldability because of a high content ratio of inorganic filler, thermally expandable graphite, phosphorus compound, etc. In addition, phosphorus compounds such as ammonium polyphosphate may be decomposed during extrusion molding or injection molding to impair the appearance of the molded body. When molding at a low temperature in order to suppress the decomposition of the phosphorus compound, the mechanical strength and impact resistance of the resulting molded product may be reduced.

  Construction piping material (for example, refer to Patent Document 4) made of a polyvinyl chloride resin composition containing thermally expandable graphite has good workability, but because this construction piping material exhibits black color derived from graphite, There was a problem that it could not be painted freely. Furthermore, heat-expandable graphite has poor compatibility with vinyl chloride, and because the dispersed particle diameter is in a dispersed state that induces internal defects of several microns or more, cracks are likely to occur when drilling piping materials, etc. There was a problem that the growth as a pipe was low. Furthermore, since thermally expandable graphite is decomposed by heat, it is a material unsuitable for recycling from the viewpoint of the color of pipe material, mechanical strength, and workability.

Registered Utility Model No. 3036449 JP-A-9-176498 JP-A-10-95887 JP 2008-180068 A

From the viewpoint of fire resistance, it is preferable that the piping material itself exhibits fire resistance. For that purpose, it is necessary to give the piping material the following functions.
(1) The flame rate of the piping material is delayed so that no flame is ejected to the non-heating side.
In order to delay the combustion speed, it is desirable to prevent the piping material itself from burning, and to thermally expand the tube wall during combustion, or to prevent heat from flowing into the partition through portion as much as possible by other means. . That is, on the heating side, it is the best means to make the piping material close to blockage and shield the flame. It is more preferable that the residue does not burn out.
(2) Even during combustion, the sealing property between the piping material and the mortar on the outer periphery thereof should be maintained, and smoke should not be generated on the non-heating side.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a fire-resistant piping that has excellent fire resistance, good physical properties, coloration, and excellent recyclability. To provide materials.

Accordingly, the inventors of the present application have made extensive studies to solve the above problems, and as a result, have completed the present invention.
That is, the fireproof piping system of the present invention is at least selected from the group consisting of a polyvinyl chloride resin, a Ca—Zn heat stabilizer, a Mg—Zn heat stabilizer, and a Ca—Mg—Zn heat stabilizer. Resin composition A containing one and a synthetic hydrotalcite compound, and containing a synthetic hydrotalcite compound within a range of 2 parts by mass or more and 12 parts by mass or less with respect to 100 parts by mass of the polyvinyl chloride resin. And at least a fire-resistant pipe joint formed using a resin composition B containing a polyvinyl chloride resin and calcium carbonate.

  Here, each of the resin composition A and the resin composition B may further contain borosilicate glass.

  Moreover, it is preferable that the said resin composition B contains magnesium hydroxide further.

  In the present invention, the fireproof piping material is a fireproof piping material comprising at least three layers having an outer layer, an intermediate layer, and an inner layer, and the intermediate layer is formed using the resin composition A. Is preferred.

  Here, it is preferable that the outer layer and the inner layer contain a molybdenum-based smoke preventive agent.

  In the present invention, one of the fireproof piping materials is piped to the fireproof fitting, and one end of the fireproof piping material is exposed 300 mm from the heating side surface of the flooring. In the fire resistance test conducted in accordance with the revised Building Standard Law, which was constructed on June 1, 1980, the performance test of the pipe that penetrates the fire protection section, etc.) It is preferable that the pipe joint surface temperature of the pipe joint does not exceed 100 ° C. when 60 minutes have elapsed from the start of the fire resistance test.

  The piping structure of the present invention is characterized by being piped through a structure such as a building using any one of the above fireproof piping systems.

  The fire-resistant piping system of the present invention has a fire-resistant piping material and a fire-resistant fitting itself that have fire-resistant performance, exhibit excellent fire-resistant performance, and have good physical properties such as mechanical properties, coloring. It is possible and is excellent in recyclability. Moreover, the piping structure formed by piping the fireproof piping system of the present invention in a structure can exhibit excellent fire resistance.

It is the figure which shows typically the piping state of a piping material and a pipe joint, and is the front view which looked at a part of the piping state from the side surface of the flooring. (A)-(d) is a schematic explanatory drawing which shows the state of the residue at the time of burning the fireproof piping system of this invention. It is the perspective view which showed the fireproof test furnace used for a fireproof performance test.

The present invention is described in detail below.
The fireproof piping system of the present invention uses at least one fireproof piping material and at least one fireproof pipe joint. Here, in order to distinguish a fireproof pipe joint from a fireproof pipe material, the fireproof pipe joint is not included when referred to as a fireproof pipe material.

  The fireproof piping material constituting the fireproof piping system of the present invention comprises a polyvinyl chloride resin, a Ca—Zn thermal stabilizer, an Mg—Zn thermal stabilizer, and a Ca—Mg—Zn thermal stabilizer. It is formed using a flame retardant resin composition containing a predetermined amount of at least one selected from the group and a synthetic hydrotalcite compound.

  At least one content selected from the group consisting of a Ca—Zn-based heat stabilizer, a Mg—Zn-based heat stabilizer, and a Ca—Mg—Zn-based heat stabilizer is based on 100 parts by mass of the polyvinyl chloride-based resin. It is preferably within the range of 0.4 parts by mass or more and 2.5 parts by mass or less, more preferably 0.6 parts by mass or more and 2.0 parts by mass or less, 0.9 parts by mass or more, .3 parts by mass or less is particularly preferable. At least one compounding amount selected from the group consisting of a Ca—Zn-based heat stabilizer, a Mg—Zn-based heat stabilizer and a Ca—Mg—Zn-based heat stabilizer is 0.4 parts by mass or more and 2.5 parts by mass or less. If so, the flame retardancy of the vinyl chloride resin can be dramatically improved, and the effects of the present invention can be realized.

  In addition, the content of the synthetic hydrotalcite compound needs to be in the range of 2 parts by mass or more and 12 parts by mass or less, preferably 2.5 parts per 100 parts by mass of the polyvinyl chloride resin. It is not less than 10 parts by mass and more preferably not less than 3 parts by mass and not more than 7 parts by mass. If the compounding quantity of a synthetic hydrotalcite compound is 2 mass parts or more and 12 mass parts or less, the flame retardance of a vinyl chloride-type resin can be improved dramatically and the effect of this invention can be implement | achieved.

  Here, the reason why at least one selected from the group consisting of a Ca—Zn heat stabilizer, a Mg—Zn heat stabilizer and a Ca—Mg—Zn heat stabilizer is blended with the polyvinyl chloride resin is as follows. For example, when a general Pb heat stabilizer used for drainage pipe applications is blended with vinyl chloride resin, the scavenging ability of chlorine is high. This is because it cannot be fully exerted and the desired flame retardancy cannot be obtained.

  The reason why the synthetic hydrotalcite compound is blended is as follows. That is, in the synthetic hydrotalcite, the water of crystallization between the molecules starts dehydration from about 180 ° C., and the water of crystallization is completely desorbed at about 300 ° C. Up to this state, the synthetic hydrotalcite retains the crystal structure, but when it exceeds about 350 ° C., the crystal structure starts to collapse and releases water and carbon dioxide. Since synthetic hydrotalcite starts endothermic decomposition at a temperature lower by about 60 ° C. to 75 ° C. than the thermal decomposition temperature of the vinyl chloride resin, which is about 200 ° C. to 300 ° C., the thermal decomposition of the vinyl chloride resin is hydrolyzed. It can be efficiently suppressed by endothermic decomposition of talcite, and the state in which the vinyl chloride resin is carbonized can be maintained for a longer time.

  Conventionally, synthetic hydrotalcite has been used to improve heat resistance, but the temperature range for exhibiting the effect was about 100 ° C. In addition, since synthetic hydrotalcite has strong water absorption and hygroscopic properties, it is important in resin molding to determine how this water absorption and moisture retention can be suppressed. Research has been done.

  The present inventors pay attention to the strong water absorption and hygroscopicity of synthetic hydrotalcite, which has been regarded as a problem in the past, and that synthetic hydrotalcite exhibits an excellent dehydration effect in a high temperature range of about 180 ° C. or higher. And, it was found that there was a particularly excellent effect in suppressing the thermal decomposition of the vinyl chloride resin, and came to the invention of a resin piping material having fire resistance.

  Examples of the polyvinyl chloride resin used in the present invention include polyvinyl chloride homopolymers, copolymers of vinyl chloride monomers and monomers having an unsaturated bond copolymerizable with the vinyl chloride monomers, other than vinyl chloride. Examples include graft copolymers obtained by graft copolymerizing vinyl chloride with other polymers (including copolymers). In the present invention, these may be used alone or in combination of two or more. If necessary, the polyvinyl chloride resin may be chlorinated. The chlorination method for the vinyl chloride resin is not particularly limited, and a conventionally known chlorination method can be employed. For example, a thermal chlorination method, a photochlorination method, or the like can be used.

  Examples of the monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer include α-olefins such as ethylene, propylene and butylene; vinyl esters such as vinyl acetate and vinyl propionate; butyl vinyl ether and cetyl vinyl ether. Vinyl ethers such as: (meth) acrylic acid esters such as methyl (meth) acrylate, ethyl (meth) acrylate, and butyl acrylate; aromatic vinyls such as styrene and α-methylstyrene; N-phenylmaleimide, N-cyclohexyl And N-substituted maleimides such as maleimide. These may be used alone or in combination of two or more.

  The polymer other than vinyl chloride (including the copolymer) used in the graft copolymer can be used without particular limitation as long as it can graft copolymerize vinyl chloride. For example, ethylene -Vinyl acetate copolymer, ethylene-vinyl acetate-carbon monoxide copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate-carbon monoxide copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene Examples include copolymers, acrylonitrile-butadiene copolymers, polyurethane, chlorinated polyethylene, and chlorinated polypropylene. These may be used alone or in combination of two or more.

  The average degree of polymerization of the polyvinyl chloride resin is not particularly limited. However, if the average degree of polymerization is small, the physical properties of the resulting molded product are likely to deteriorate, and if the average degree of polymerization is large, the melt viscosity becomes high. Since molding tends to be difficult, the average degree of polymerization is preferably in the range of 400 to 1,600, more preferably 600 to 1,400. In the present invention, the average degree of polymerization means that a vinyl chloride resin is dissolved in tetrahydrofuran (THF) and filtered to remove insoluble components, and then THF in the filtrate is removed by drying. The resulting resin is used as a sample in Japan. It shall mean the average degree of polymerization measured according to the “vinyl chloride resin test method” of the industrial standard JIS K-6721.

  The vinyl chloride resin is not particularly limited and can be polymerized by a conventionally known polymerization method. For example, it can be polymerized by a bulk polymerization method, a solution polymerization method, an emulsion polymerization method, a suspension polymerization method, or the like. it can.

  The vinyl chloride resin may be subjected to treatments such as cross-linking and modification within a range that does not impair the effects of the present invention, for example, within a range that does not impair fire resistance. In this case, a resin that has been previously cross-linked and modified may be used, but when blending additives and the like, it may be cross-linked and modified at the same time, or after various components are blended in the resin, Denaturation may be performed. The crosslinking method is not particularly limited, and a crosslinking method commonly used for vinyl chloride resins can be adopted. For example, various crosslinking agents, crosslinking methods using peroxides, crosslinking by electron beam irradiation, and the like. A method, a crosslinking method using a water-crosslinkable material, and the like can be used.

  Examples of the polyvinyl chloride resin include “TK1000HN” (average polymerization degree: 1030) manufactured by Shin-Etsu Chemical Co., Ltd., “TK700” (average polymerization degree: 700) manufactured by the same company, and “MT700” manufactured by Vitec Corporation ( An average degree of polymerization: 700) can also be obtained commercially.

  The Mg—Zn, Ca—Zn, and Ca—Mg—Zn heat stabilizers used in the present invention are preferably metal soap heat stabilizers. As heat stabilizers for Mg—Zn, Ca—Zn, and Ca—Mg—Zn metal soaps, zinc stearate, magnesium stearate, calcium stearate, and the like are used in various combinations. For example, as a heat stabilizer for a Ca—Mg—Zn-based metal soap, zinc stearate, magnesium stearate and calcium stearate can be used in combination. Preferred examples of the magnesium component and the calcium component include magnesium and calcium organic acid salts, magnesium salts such as magnesium and calcium inorganic acid salts, and calcium salts. Preferred examples of the zinc component include zinc organic acid salts, Zinc salts such as inorganic acid salts of zinc are preferred.

  Here, examples of the organic acid preferably used include fatty acids such as acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, octanoic acid, lauric acid, stearic acid, behenic acid, octylic acid, and benzoic acid. In addition, an organic acid salt such as calcium or sodium can be used in combination with a magnesium salt depending on the purpose such as improvement of heat resistance.

  Of the components of the Mg-Zn thermal stabilizer, Ca-Zn thermal stabilizer and Ca-Mg-Zn thermal stabilizer, the magnesium component and the calcium component have an effect of improving the late thermal stability, and the zinc component is There is an effect of improving the initial stability. Increasing the amount of magnesium component and calcium component improves long-term stability, but it is necessary to use a zinc component in combination to prevent initial red discoloration. However, if the amount of the zinc component added is too large, so-called zinc burns are generated, so attention must be paid to the amount added. In the present invention, magnesium stearate and calcium stearate are preferably used as the magnesium component and calcium component, and zinc stearate is preferably used as the zinc component.

  Regarding magnesium stearate, “FACII” manufactured by Mizusawa Chemical Co., Ltd. can be obtained commercially. Moreover, about zinc stearate, "NT-Z1" by Mizusawa Chemical Co., Ltd. can be obtained commercially.

  As described above, the resin composition A forming the fireproof piping material contains a synthetic hydrotalcite compound. The synthetic hydrotalcite used here has a chemical name of magnesium, aluminum, hydroxide, carbonate, hydrate and is represented by the following general formula.

[Mg ₆ Al ₂ (OH) ₁₆ CO ₃ .4H ₂ O]

  The synthetic hydrotalcite compound used in the present invention preferably has an average particle size of 0.1 μm to 2.0 μm, more preferably 0.3 μm to 1.0 μm. As the synthetic hydrotalcite compound, for example, “Alkamizer 1” manufactured by Kyowa Chemical Co., Ltd. can be obtained commercially. The average particle size referred to here is a particle size value at which an integrated value represented by an integrated (cumulative) percentage in the particle size distribution is 50%.

Borosilicate glass can be further added to the resin composition A forming the fireproof piping material according to the present invention. Since the softening point of borosilicate glass is 600 to 800 ° C., the residue formed at the time of combustion can be coated with glass, and as a result, the supply of oxygen to the residue is hindered and generated from the residue. This will inhibit the release of combustible gas to the combustion field, greatly improve the flame retardancy of the vinyl chloride resin, and contribute greatly to maintaining the shape of the residue formed during combustion. In the present invention, the borosilicate glass preferably has an average particle size of 0.01 μm or more and 250 μm or less, and more preferably 0.1 μm or more and 100 μm or less. If the average particle size is less than 0.01 μm, it may be difficult to handle as a powder, and if it exceeds 250 μm, the inorganic compound particles may protrude from the surface of the resulting molded product. The condition may deteriorate. The average particle size referred to here is a particle size value at which an integrated value represented by an integrated (cumulative) percentage in the particle size distribution is 50%.
As the borosilicate glass, for example, “FC” manufactured by Nissho Material Co., Ltd. can be obtained commercially.

  The blending amount of the borosilicate glass is preferably 2 parts by mass or more and 10 parts by mass or less, more preferably 3 parts by mass or more and 8 parts by mass or less, particularly 100 parts by mass of the polyvinyl chloride resin. Preferably they are 4 mass parts or more and 7 mass parts or less. When the blending amount of borosilicate glass is 2 parts by mass or more and 10 parts by mass or less, the flame retardancy of the vinyl chloride resin can be drastically improved and the above effect can be realized.

  The fireproof pipe joint constituting the fireproof piping system of the present invention is formed by using a polyvinyl chloride resin and a resin composition B containing calcium carbonate. When calcium carbonate is blended with the polyvinyl chloride resin, a thermal deformation suppressing effect can be exhibited during combustion. As this polyvinyl chloride resin, the same polyvinyl chloride resin used for the above-mentioned fireproof piping material can be used.

As the calcium carbonate used in the resin composition B, a commercially available product can be used, but it is preferable to use calcium carbonate surface-treated with a fatty acid, and this can be mixed with a polyvinyl chloride resin. preferable. For example, the surface treatment is performed by mixing the unsaturated fatty acid (A) having 9 to 21 carbon atoms and the saturated fatty acid (B) having 9 to 21 carbon atoms in the range of (A) / (B) = 1 to 2. It is particularly preferred to use calcium carbonate.
This is because some commercially available calcium carbonate aggregates without being well dispersed in polyvinyl chloride, and in this case, the aggregate causes a decrease in mechanical strength.

  As calcium carbonate, for example, “Shiraka Hana CCR” manufactured by Shiroishi Kogyo Co., Ltd. can be commercially obtained.

  The blending amount of calcium carbonate is preferably 0.5 parts by mass or more and 12 parts by mass or less, and more preferably 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the polyvinyl chloride resin. It is particularly preferably 3 parts by mass or more and 7 parts by mass or less. This is because if the blending amount of calcium carbonate is less than 0.5 parts by mass, a sufficient effect of suppressing thermal deformation during combustion may not be exhibited, and desired fire resistance may not be obtained. Moreover, when the compounding quantity of calcium carbonate exceeds 12 mass parts, the performance of a pipe joint may be impaired remarkably, and it may be unable to shape | mold.

  Magnesium hydroxide can be further blended in the resin composition B used for forming the fireproof pipe joint according to the present invention. Further flame retardancy can be imparted by including magnesium hydroxide.

As the magnesium hydroxide used in the present invention, a commercial product can be used, but it is preferable to use magnesium hydroxide surface-treated with a silane coupling agent, and this is mixed with a polyvinyl chloride resin. It is preferable to do. For example, it is more preferable to use magnesium hydroxide surface-treated with an amount of a silane coupling agent of 0.05 to 2 parts by mass per 100 parts by mass of magnesium hydroxide.
This is because some commercially available magnesium hydroxide agglomerates without being well dispersed in polyvinyl chloride, and in this case, the agglomerates cause a decrease in mechanical strength.

  As magnesium hydroxide, for example, “Magusarat F” manufactured by Kyowa Chemical Industry Co., Ltd. can be obtained commercially.

  The blending amount of magnesium hydroxide is preferably 0.5 parts by mass or more and 5 parts by mass or less, more preferably 1 part by mass or more and 3 parts by mass or less with respect to 100 parts by mass of the polyvinyl chloride resin. . When the blending amount of magnesium hydroxide is 0.5 parts by mass or more, a sufficient flame retarding effect can be exhibited during combustion, and desired fire resistance can be obtained. Moreover, if the compounding quantity of magnesium hydroxide is 5 mass parts or less, the performance of a pipe joint will not be impaired remarkably.

  It is preferable to add a heat stabilizer to the resin composition B used for the fireproof pipe joint according to the present invention within a range not inhibiting the effects of the present invention. Examples of the heat stabilizer include lead-based heat stabilizers, organotin-based heat stabilizers, and higher fatty acid metal salts. These may be used alone or in combination of two or more.

  Examples of lead heat stabilizers include lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, silica gel co-precipitated silica. Lead acid, dibasic lead stearate, lead stearate, lead naphthenate and the like can be mentioned.

  Examples of organotin heat stabilizers include mercapts such as dibutyltin mercapto, dioctyltin mercapto, and dimethyltin mercapto; dibutyltin malate, dibutyltin malate polymer, dioctyltin malate, dioctyltin malate polymer, and the like. Malates; carboxylates such as dibutyltin mercaptodibutyltin laurate and dibutyltin laurate polymer.

  Examples of higher fatty acid metal salts (metal soaps) include lithium stearate, magnesium stearate, calcium stearate, calcium laurate, calcium ricinoleate, strontium stearate, barium stearate, barium laurate, barium ricinoleate, stearin. Cadmium acid, cadmium laurate, cadmium ricinoleate, cadmium naphthenate, cadmium 2-ethylhexoate, zinc stearate, zinc laurate, zinc ricinoleate, zinc 2-ethylhexoate, lead stearate, lead dibasic stearate For example, lead naphthenate.

  The blending amount of the heat stabilizer is not particularly limited. For example, it may be blended at a ratio of 0.3 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the polyvinyl chloride resin. It is preferably 1 part by mass or more and 9 parts by mass or less, and particularly preferably 2 parts by mass or more and 8 parts by mass or less. When the blending amount of the thermal stabilizer is 0.3 parts by mass or more, the thermal stability of the polyvinyl chloride resin can be ensured during molding, and carbides are not generated during molding. Moreover, if the compounding quantity of a heat stabilizer is 10 mass parts or less, it can express sufficient fireproof performance, without inhibiting the carbonization promotion of a polyvinyl chloride-type resin at the time of combustion.

  Borosilicate glass can be added to the resin composition B used in the present invention as long as the effects of the present invention are not impaired. As the borosilicate glass used, the same borosilicate glass as that used for the resin composition A described above can be used. The blending amount of the borosilicate glass in the resin composition B is preferably in the range of 0.01 to 3 parts by mass, more preferably 0.05 to 100 parts by mass of the polyvinyl chloride resin. It is not less than 2 parts by mass and particularly preferably not less than 0.1 parts by mass and not more than 1 part by mass.

  The resin composition A and the resin composition B used for the fireproof piping material according to the present invention each have a heat stabilization aid, an inorganic filler, a lubricant, and a processing aid within a range that does not impair the effects of the present invention. Additives such as additives, impact modifiers, heat resistance improvers, antioxidants, light stabilizers, ultraviolet absorbers, pigments, plasticizers, and thermoplastic elastomers may be added.

  Examples of the stabilizing aid include epoxidized soybean oil, phosphate ester, polyol and the like. These may be used alone or in combination of two or more.

  Examples of the lubricant include an internal lubricant and an external lubricant. The internal lubricant is used for the purpose of reducing the flow viscosity of the molten resin during molding and preventing frictional heat generation. Examples of the internal lubricant include butyl stearate, lauryl alcohol, stearyl alcohol, epoxy soybean oil, glycerin monostearate, stearic acid, bisamide and the like. These may be used alone or in combination of two or more.

  The external lubricant is used for the purpose of improving the sliding effect between the molten resin and the metal surface during the molding process. Examples of the external lubricant include paraffin wax, polyolefin wax, ester wax, and montanic acid wax. These may be used alone or in combination of two or more.

  Examples of the processing aid include acrylic processing aids such as alkyl acrylate-alkyl methacrylate copolymers having a weight average molecular weight of 100,000 to 2,000,000. Examples of the acrylic processing aid include n-butyl acrylate-methyl methacrylate copolymer and 2-ethylhexyl acrylate-methyl methacrylate-butyl methacrylate copolymer. These may be used alone or in combination of two or more.

  Examples of the impact modifier include methyl methacrylate-butadiene-styrene copolymer (MBS), acrylic rubber, and the like.

  Examples of the heat resistance improver include α-methylstyrene resins and N-phenylmaleimide resins.

  Examples of the antioxidant include phenol-based antioxidizing agents.

  Examples of light stabilizers include hindered amine light stabilizers.

  Examples of the UV absorber include salicylic acid ester UV absorbers, benzophenone UV absorbers, benzotriazole UV absorbers, and cyanoacrylate UV absorbers.

  Examples of the pigment include organic pigments such as azo, phthalocyanine, selenium, and dye lake; inorganic pigments such as oxide, molybdenum chromate, sulfide / selenide, and ferrocyanide It is done.

  A plasticizer can be added to the polyvinyl chloride resin. However, since the plasticizer may reduce the heat resistance and fire resistance of the molded article to be obtained, it is not preferable to use a large amount. Examples of the plasticizer used include dibutyl phthalate, di-2-ethylhexyl phthalate, di-2-ethylhexyl adipate, and the like.

  Examples of the thermoplastic elastomer include acrylonitrile-butadiene copolymer (NBR), ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl acetate-carbon monoxide copolymer (EVACO), and vinyl chloride-vinyl acetate copolymer. Vinyl chloride thermoplastic elastomers such as polymers and vinyl chloride-vinylidene chloride copolymers, styrene thermoplastic elastomers, olefin thermoplastic elastomers, urethane thermoplastic elastomers, polyester thermoplastic elastomers, polyamide thermoplastic elastomers, etc. Is mentioned. These may be used alone or in combination of two or more.

Examples of the inorganic filler include silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, aluminum hydroxide, and basic magnesium carbonate. , Calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dawnite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, Sericite, glass fiber, glass beads, silica-based balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metal powders, potassium titanate, magnesium sulfate "MOS", lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powder, slag fibers, fly ash, and a dewatered sludge. If an inorganic filler is blended, the shape retention of the residue formed during combustion becomes good.
The blending amount of the inorganic filler is preferably 0 parts by mass or more and 10.0 parts by mass or less, more preferably 3 parts by mass or more and 7.0 parts by mass or less with respect to 100 parts by mass of the polyvinyl chloride resin. It is. When the compounding quantity of an inorganic filler exceeds 10.0 mass parts, the mechanical strength of the piping material obtained may be impaired.

  A method for mixing the additive with the polyvinyl chloride resin is not particularly limited, and a general method can be adopted. For example, a method using hot blending, a method using cold blending, or the like can be used.

  The fire-resistant piping material constituting the fire-resistant piping system of the present invention may have a single-layer structure or a laminated structure of two or more layers. In the case of a laminated structure, it is preferable to arrange the layer made of the resin composition A in the intermediate layer, and for example, a laminated structure including at least the outer layer, the intermediate layer, and the inner layer in this order is preferable. By providing a layer made of the resin composition A as an intermediate layer of the fireproof piping material, desired mechanical strength can be achieved while exhibiting fireproof performance. Further, if a layer made of the above resin composition is arranged in the intermediate layer, for example, a multilayer structure having other layers between the outer layer and the intermediate layer or between the intermediate layer and the inner layer can be formed. The types of other layers and the like can be appropriately designed according to the use.

  In the present invention, the outer layer (outermost layer) and the inner layer (innermost layer) are preferably formed using a resin composition containing a molybdenum-based smoke preventive agent. As described above, by arranging the layers using the resin composition for the outer layer and the inner layer, further fire resistance can be imparted without impairing the mechanical strength. For example, “SKR808M” manufactured by Kikuchi Color Co., Ltd. can be commercially obtained as the molybdenum-based smoke-proofing agent. The addition amount of the molybdenum-based smokeproof material is 0.1 to 3.0 parts by mass with respect to 100 parts by mass of the main resin (eg, polyvinyl chloride resin). More preferably, it is 0.5 parts by mass or more and 1.5 parts by mass or less. It should be noted that the outer layer, the inner layer, etc. are appropriately provided with a heat stabilizer, the above-mentioned heat stabilization aid, inorganic filler, lubricant, processing aid, impact modifier, heat resistance improver, antioxidant, light Additives such as stabilizers and ultraviolet absorbers can be added.

  The thickness of each layer such as the outer layer, the intermediate layer, and the inner layer can be appropriately determined according to the purpose of use, etc., but the thickness of the intermediate layer is preferably 60% or more of the thickness of the piping material (total thickness), More preferably, it is 70% or more. If the thickness of the intermediate layer is 70% or more of the total wall thickness, the fire resistance can be sufficiently exhibited. For example, even if a general Pb heat stabilizer or the like is included in the outer layer, the fire resistance is sufficient. Performance can be demonstrated. In addition, it is preferable that the outer diameter, inner diameter, and the like of the piping material are appropriately determined according to the purpose of use, the location, and the like.

  The fireproof pipe joint constituting the fireproof piping system of the present invention may have a single-layer structure. According to the present invention, fire resistance can be sufficiently exhibited even with a single layer configuration.

  The fireproof piping material and the fireproof pipe joint constituting the fireproof piping system of the present invention are manufactured by generally used extrusion molding machines and injection molding machines. The type and screw shape of the molding machine can be freely selected without particular limitation as long as it can be sufficiently kneaded in consideration of the tensile strength and impact strength of the resulting molded body, for example, An extruder capable of continuous molding is preferably used. In the case of a fireproof piping material having a multilayer structure, a die having a multilayer structure generally used for the extrusion molding machine can be used.

  In the present invention, one of the above-mentioned fire-resistant piping materials is piped to one of the above-mentioned fire-resistant pipe joints, and ISO 834 is exposed in a state where one end of the fire-resistant piping material is exposed 300 mm from the heating side surface of the flooring. -1 (evaluation method of performance test of pipes penetrating fire prevention compartments etc. based on the revised Building Standard Act, constructed on June 1, 2000), 10mm from flooring in non-heated area It is preferable that the pipe joint surface temperature of the fireproof pipe joint at the position of does not exceed 100 ° C. when 60 minutes have passed since the start of the fireproof test. Such a fire-resistant piping system can be used for a fire-protection section penetrating portion, and reaches a pass level when a two-hour fire resistance test is performed in accordance with ISO 834-1, and has high shielding performance. In general, when the resin composition becomes hot, the strength of the piping material and the pipe joint decreases, and there is a problem with respect to micro vibrations and shocks. Therefore, the resin piping material and the resin pipe fitting are usually used in the fireproof compartment. There is nothing, but if it has such a high shielding performance, it can be used for a fire protection compartment.

  The fireproof piping materials and fireproof pipe joints constituting the fireproof piping system of the present invention can be used, for example, as pipes for electric pipes, drainage pipes, ducts and the like installed in buildings. By piping through the structure, a piping structure that can realize excellent fire resistance can be obtained. For example, in-building piping is usually composed of vertical pipes, pipe joints, horizontal branch pipes, etc., and the fireproof piping material according to the present invention has any shape such as vertical pipes, horizontal branch pipes, etc. Can also be molded. Specifically, referring to FIG. 1, the pipe joint main pipe portion 31 of the pipe joint 3 includes an upper receiving port 31 a and a lower receiving port 31 b into which the rising pipe 2 can be fitted. 2 is a cylinder having an inner diameter substantially the same size as 2, and a lateral branch pipe connection portion 32 is connected to the middle portion in a communicating state. The horizontal branch pipe connecting portion 32 includes a receiving port 32a into which the horizontal branch pipe 6 can be fitted. Moreover, the fire-resistant piping material and fire-resistant pipe joint of the present invention can be fitted with ordinary piping, and the piping material of the present invention can be arranged as necessary.

  In general, piping in buildings is constructed as follows. That is, the lower receiving port 31 b provided at the lower end portion of the main body of the pipe joint 3 faces the inside of the through hole 41 of the floor slab (floor material) 1 without being exposed to the lower side of the floor slab (floor material) 1. After connecting the upper end portion of another standing pipe 2 arranged below the floor slab 1 to the lower receiving port 31b of the pipe joint 3 within the through hole, the through hole 41 and the pipe joint are connected to each other. The gap is filled with mortar 7. Next, the lower end portion of the pipe for standing pipe 2 is connected to the upper receiving port 31 a provided in the upper end portion of the main body of the pipe joint 3, and the receiving port 32 a of the side branch pipe connecting portion 32 provided for the pipe joint 3 Is connected to the pipe 6 for the side branch pipe.

  For example, when a fire breaks out on a certain floor and the vertical pipe for drainage is exposed to a flame, the vertical pipe itself exhibits a combustion delay effect and has a function of heat insulation, flame insulation and smoke insulation. If so, it can prevent heat, flames, and smoke from entering other floors and prevent the spread of fire. In addition, if the pipe for standing pipe itself exhibits a combustion retarding effect, the pipe joint itself can be prevented from burning, or if the pipe joint itself is of the heat resistance of the present application, it will not be heated even if heated by a flame. Since expansion does not occur, there is no gap between the pipe joint and the mortar filled in the through hole, and it is possible to prevent inflow of smoke, heat and flame to other floors for a long time.

  The piping material for fire resistance according to the present invention is at least one selected from the group consisting of a polyvinyl chloride resin, a Ca—Zn thermal stabilizer, an Mg—Zn thermal stabilizer, and a Ca—Mg—Zn thermal stabilizer. And a resin composition A containing synthetic hydrotalcite, and the fireproof pipe joint according to the present invention comprises a resin composition B containing a polyvinyl chloride resin and calcium carbonate. Since it is formed by using, it is excellent in moldability and can be continuously produced with high dimensional accuracy by, for example, injection molding, extrusion molding or the like.

  Since the polyvinyl chloride resin constituting the fireproof piping material and the fireproof pipe joint constituting the fireproof piping system of the present invention can be foamed at the early stage of combustion, it is excellent in heat shielding and self-extinguishing Therefore, it is possible to effectively express the delay of the combustion speed and suppress the propagation speed of the flame during combustion. Further, by further blending at least one selected from the group consisting of a Ca—Zn heat stabilizer, a Mg—Zn heat stabilizer and a Ca—Mg—Zn heat stabilizer, the self-digestibility is further improved. By further blending synthetic hydrotalcite, an endothermic effect is exhibited and flame retardancy is improved. Further, since calcium carbonate is blended in the fireproof pipe joint, thermal deformation does not occur even when heated by a flame in the event of a fire, and no gap is formed between the pipe joint and the mortar.

  Therefore, the piping material for fireproofing and the pipe joint for fireproofing according to the present invention have excellent fire resistance in the piping material itself and the pipe joint itself, and can close the passage at the time of combustion, Since the burning speed delay effect is also exhibited, it is possible to prevent the flame and smoke from turning to the other side (unburned portion) partitioned by the partition through portion.

  The state of the piping material and the pipe joint (piping system) during combustion will be described below with reference to the drawings. FIG. 2 shows a pipe-shaped pipe material 20 as a fireproof piping material according to the present invention, a fireproof pipe joint 3 according to the present invention, and another pipe-shaped pipe material 20 as a fireproof piping material according to the present invention. FIG. 3 is a schematic cross-sectional view schematically showing a state where piping is provided through the floor material 1, an upper region from the floor material 1 in FIG. 2 is a non-heating side, and a lower region from the floor material 1 is a heating side. . (A)-(d) of FIG. 2 is a figure explaining the state in which a residue is formed by combustion. For example, when heated from below (a) in FIG. 2, the lower tip of the tube material 20 is detached and shortened at least once (see FIG. 2 (b)), and the heating side end 20 ′ of the tube material 20. Carbonizes and the tube diameter becomes narrower (see FIG. 2C). When the heating state continues, the tube diameter of the heating side end portion 20 ′ further narrows, and the passage of the tube becomes nearly closed (see FIG. 2). 2 (d)). In addition, the heating side end portion 20 ′ in FIG. 2 indicates a residue portion.

  Here, a residue means the part which the piping material combusted and carbonized. In addition, when the through hole is close to the closed state, the minimum inner diameter opening area of the inner diameter opening of the fireproof piping material after the fire resistance test is 50% or less with respect to the inner diameter opening area of the fireproof piping material before the fire resistance test. Yes, preferably 45% or less, more preferably 40% or less, and particularly preferably 30% or less. It should be noted that when the numerical value is 0%, that is, a completely closed state is included in the present invention.

  Therefore, unlike the conventional construction, there is no need to provide a fireproof member around the piping material or the like, and the construction is easy. In addition, if the fireproof piping system of the present invention is used, the work of position confirmation marking at the time of temporary piping at the time of construction, which is necessary in the conventional construction, becomes unnecessary, and the fireproof piping material is simply inserted into the partition penetration portion. Since it is only necessary to make it work, the work can be greatly reduced, and the on-site workability can be greatly improved. In addition, the pipe for fireproof according to the present invention can keep the outer diameter of the pipe small compared to a so-called fireproof double-layer pipe in which the outer periphery of a conventional vinyl chloride resin pipe is coated with fiber reinforced mortar. Even if it is necessary to provide a plurality of holes, the interval between each through hole can be reduced, and even when piping under the floor, there is an advantage that a gradient can be easily taken, and the workability is dramatically improved. .

  In the present invention, borosilicate glass can be contained in the resin composition A and the resin composition B that form the fireproof piping material. In this case, the flame retardancy is further enhanced, and the residue formed during combustion The shape-retaining property can be exhibited.

In addition, when the fireproof piping material adopts a multilayer structure and the intermediate layer is formed using the flame retardant resin composition, desired mechanical strength can be obtained while exhibiting fireproof performance. Furthermore, when the outer layer and the inner layer of the multilayer structure are made of a polyvinyl chloride resin composition containing a molybdenum-based smoke preventive agent, further fire resistance can be imparted.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely using an Example, this invention is not limited to these Examples. In addition, the various measured values and evaluation method used in the Example were measured by the method shown below, and it evaluated and calculated | required.

(1) Evaluation of fire resistance performance Evaluation method of fire resistance performance test of the revised Building Standard Act constructed on June 1, 2000: Using fire resistance test furnace X (see Fig. 3) in accordance with ISO 834-1 A 2-hour fire resistance test was conducted.

  The evaluation object is a piping system in which the pipe-shaped pipe material (standing pipe) and the pipe joint are piped. The pipe-shaped tube material has a length of 1,300 mm, an outer diameter of 140 mm, a thickness of 7.5 mm, a nominal diameter of 125 A, or a length of 1,300 mm, an outer diameter of 114 mm, a thickness of 7.1 mm, and a nominal diameter of 100 A. The pipe joint is a Y joint-shaped (90 ° large curve, nominal diameter 125 mm × 125 mm) pipe joint or a Y joint-shaped (90 ° large curve, nominal diameter 100 mm × 100 mm) pipe joint.

In FIG. 3, a lightweight cellular concrete board (length 600 mm × width 600 mm × thickness 150 mm) is used for the flooring 1, and a pipe (tube material) 20 is cut into one appropriate length as a fireproofing method. The piping system was formed by connecting with a pipe joint, and the gap with the partition through portion was closed with mortar.
One end of the pipe 20 is 300 mm from the heating side surface of the flooring 1 to the heating side region (heating chamber) 4, and the other end (an end of another pipe 20) is not heated from the non-heating side surface of the flooring The pipe 20 and the pipe joint 3 were arrange | positioned so that 800 mm might be exposed to an area | region. In the heating chamber 4 of the refractory test furnace X, burners (V1, V2) are installed at two locations on the inner side wall, and two hot junctions of the thermocouple 5 in the furnace serve as the test surface of the flooring 1. So that the surface temperature of the pipe joint 3 at a position 10 mm higher than the lightweight cellular concrete plate (floor material) can be measured. A thermocouple is also installed. Furthermore, the refractory test furnace X is also provided with a device (not shown) that can measure the pressure in the furnace.

The operation of the refractory test furnace was performed using two burners so that the elapsed time of the heating temperature satisfies the numerical value represented by the following formula. In the following formula, T is the temperature in the furnace (° C.), and t is the combustion time (minutes).

T = 345 * log (8 * t + 1) +20

  After the heating was started, the time (smoke generation time) required until smoke was generated from the gap between the partition penetration part and the pipe joint was measured. Those that did not smoke for more than 120 minutes are acceptable levels. The presence or absence of smoke generation (smoke generation) was determined visually.

  Moreover, the temperature of the pipe joint surface (position 10 mm from a flooring) 60 minutes after a heating start was measured. Those whose temperature does not exceed 100 ° C. are acceptable levels.

(2) Comprehensive evaluation The said evaluation result was displayed in the table | surface as comprehensive evaluation. That is, when the smoke generation time is 120 minutes or more and the temperature of the pipe joint surface (position 10 mm from the flooring) for 60 minutes after heating satisfies 100 ° C. or less, it is indicated by the symbol “◯”, and at least one of these conditions Those not satisfying the above are indicated by the symbol “×”.

[Example 1]
0.2 parts by mass of magnesium stearate, 0.8 parts by mass of zinc stearate, and average particle diameter with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer A synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) having a particle size of 0.4 μm was blended at a ratio of 5 parts by mass to prepare an intermediate layer resin composition. The obtained intermediate layer resin composition was used to form an intermediate layer. For each of the outer layer and the inner layer, 100 parts by mass of polyvinyl chloride resin (average degree of polymerization: 1030), which is a polyvinyl chloride homopolymer, is lead stearate (“NC18ED” manufactured by Mizusawa Chemical Co., Ltd.). The resin composition which mix | blended 2.0 mass parts and molybdenum-type smokeproof agent in the ratio of 1.0 mass part was used. Using the obtained resin composition for the intermediate layer and the resin composition for the inner and outer layers, a pipe-shaped tube material (length 1,300 mm, outer diameter 140 mm, outer layer / intermediate layer / inner layer) by extrusion molding, A thickness of 7.5 mm, a nominal diameter of 125 A, and an intermediate layer thickness of 80% were produced.

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. Injection molding using a resin composition containing 8 parts by mass, 3 parts by mass of calcium carbonate (surface-treated with a fatty acid), and 0.05 parts by mass of borosilicate glass having an average particle size of 20 μm Thus, a Y-joint-shaped pipe joint (90 ° large bend, nominal diameter 125 mm × 125 mm) to be piped to the partition penetrating part in the building was produced.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Example 2]
As a resin composition for an intermediate layer, 0.2 parts by mass of magnesium stearate and 0.8 parts of zinc stearate with respect to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. Part by mass: 6 parts by mass of borosilicate glass having an average particle diameter of 20 μm and 5 parts by mass of synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) having an average particle diameter of 0.4 μm Blended with As a resin composition used for each of the outer layer and the inner layer, lead stearate (manufactured by Mizusawa Chemical Co., Ltd.) is used with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. "NC18ED") was blended at a ratio of 2.0 parts by mass and a molybdenum-based anti-smoke agent at a ratio of 1.0 part by mass. The obtained resin composition for the intermediate layer and the resin composition for the inner and outer layers were put into an extrusion molding machine, and a pipe-shaped tube (length 1,300 mm) having a three-layer structure (outer layer / intermediate layer / inner layer) was formed by extrusion molding. , Outer diameter 140 mm, thickness 7.5 mm, nominal diameter 125 A, intermediate layer thickness 80%).

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. 8 parts by weight, Y joint-shaped pipe joint piped to a partition through part in a building by injection molding using a resin composition in which calcium carbonate (surface-treated with a fatty acid) is blended at a ratio of 1 part by weight (90 ° large bend, nominal diameter 125 mm × 125 mm) was produced.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Example 3]
As a resin composition for an intermediate layer, 0.1 parts by mass of magnesium stearate and 0.4 parts of zinc stearate with respect to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. 6 parts by mass of borosilicate glass having an average particle diameter of 20 μm and 3.6 parts by mass of synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) having an average particle diameter of 0.4 μm It mix | blended in the ratio. As a resin composition used for each of the outer layer and the inner layer, lead stearate (manufactured by Mizusawa Chemical Co., Ltd.) is used with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. "NC18ED") was blended at a ratio of 2.0 parts by mass. The obtained resin composition for the intermediate layer and the resin composition for the inner and outer layers were put into an extrusion molding machine, and a pipe-shaped tube (length 1,300 mm) having a three-layer structure (outer layer / intermediate layer / inner layer) was formed by extrusion molding. , Outer diameter 114 mm, thickness 7.1 mm, nominal diameter 100 A, intermediate layer thickness 75%).

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. 8 parts by mass, 5 parts by mass of calcium carbonate (surface-treated with a fatty acid), 0.1 parts by mass of borosilicate glass having an average particle size of 20 μm, and 1 part by mass of magnesium hydroxide were blended. Using the resin composition, a Y-joint-shaped pipe joint (90 ° large bend, nominal diameter 100 mm × 100 mm) to be piped to the partition through portion in the building was produced by injection molding.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Example 4]
As a resin composition for an intermediate layer, 0.2 parts by mass of magnesium stearate and 0.8 parts of zinc stearate with respect to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. 6 parts by mass of borosilicate glass having an average particle diameter of 20 μm and 3.6 parts by mass of synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) having an average particle diameter of 0.4 μm It mix | blended in the ratio. As a resin composition used for each of the outer layer and the inner layer, lead stearate (manufactured by Mizusawa Chemical Co., Ltd.) is used with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. "NC18ED") was blended at a ratio of 2.0 parts by mass. The obtained resin composition for the intermediate layer and the resin composition for the inner and outer layers were put into an extrusion molding machine, and a pipe-shaped tube (length 1,300 mm) having a three-layer structure (outer layer / intermediate layer / inner layer) was formed by extrusion molding. , Outer diameter 140 mm, thickness 7.5 mm, nominal diameter 125 A, intermediate layer thickness 80%).

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. Injection molding using a resin composition containing 2 parts by mass, 7 parts by mass of calcium carbonate (surface-treated with fatty acid), and 0.1 part by mass of borosilicate glass having an average particle size of 20 μm Thus, a Y-joint-shaped pipe joint (90 ° large bend, nominal diameter 125 mm × 125 mm) to be piped to the partition penetrating part in the building was produced.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Example 5]
As a resin composition for the intermediate layer, 0.4 parts by mass of magnesium stearate and 1.6 parts by mass of zinc stearate with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. 6 parts by mass of borosilicate glass having an average particle diameter of 20 μm and 3.6 parts by mass of synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) having an average particle diameter of 0.4 μm It mix | blended in the ratio. As a resin composition used for each of the outer layer and the inner layer, lead stearate (manufactured by Mizusawa Chemical Co., Ltd.) is used with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. "NC18ED") was blended at a ratio of 2.0 parts by mass. The obtained resin composition for the intermediate layer and the resin composition for the inner and outer layers were put into an extrusion molding machine, and a pipe-shaped tube (length 1,300 mm) having a three-layer structure (outer layer / intermediate layer / inner layer) was formed by extrusion molding. , Outer diameter 114 mm, thickness 7.1 mm, nominal diameter 100 A, intermediate layer thickness 75%).

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. 8 parts by weight, Y-joint-shaped pipe joint piped to a partition through part in a building by injection molding using a resin composition containing 5 parts by weight of calcium carbonate (surface-treated with fatty acid) (90 ° large bend, nominal diameter 100 mm × 100 mm) was produced.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Example 6]
As a resin composition for an intermediate layer, 0.1 parts by mass of magnesium stearate and 0.8 parts of zinc stearate with respect to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. Part by mass (0.4 parts by mass + 0.4 parts by mass) 0.1 parts by mass of calcium stearate, 6 parts by mass of borosilicate glass having an average particle size of 20 μm, and synthetic hydro having an average particle size of 0.4 μm Talsite (magnesium, aluminum, hydroxide, carbonate, hydrate) was blended at a ratio of 3.6 parts by mass. As a resin composition used for each of the outer layer and the inner layer, lead stearate (manufactured by Mizusawa Chemical Co., Ltd.) is used with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. "NC18ED") was blended at a ratio of 2.0 parts by mass. The obtained resin composition for the intermediate layer and the resin composition for the inner and outer layers were put into an extrusion molding machine, and a pipe-shaped tube (length 1,300 mm) having a three-layer structure (outer layer / intermediate layer / inner layer) was formed by extrusion molding. , Outer diameter 114 mm, thickness 7.1 mm, nominal diameter 100 A, intermediate layer thickness 75%).

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. 8 parts by weight, Y-joint shaped pipe joint that is piped to a section through part in a building by injection molding using a resin composition in which calcium carbonate (surface-treated with fatty acid) is blended at a ratio of 10 parts by weight (90 ° large bend, nominal diameter 100 mm × 100 mm) was produced.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Example 7]
As a resin composition for an intermediate layer, 0.2 parts by mass of calcium stearate and 0.8 parts by mass of zinc stearate with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. 6 parts by mass of borosilicate glass having an average particle size of 20 μm and 3.6 parts by mass of synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) having an average particle size of 0.4 μm Formulated in proportions. As a resin composition used for each of the outer layer and the inner layer, lead stearate (manufactured by Mizusawa Chemical Co., Ltd.) is used with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. "NC18ED") was blended at a ratio of 2.0 parts by mass. The obtained resin composition for the intermediate layer and the resin composition for the inner and outer layers were put into an extrusion molding machine, and a pipe-shaped tube (length 1,300 mm) having a three-layer structure (outer layer / intermediate layer / inner layer) was formed by extrusion molding. , Outer diameter 114 mm, thickness 7.1 mm, nominal diameter 100 A, intermediate layer thickness 75%).

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. 8 parts by mass, 3 parts by mass of calcium carbonate (surface-treated with fatty acid), 0.1 part by mass of borosilicate glass having an average particle diameter of 20 μm, and 1 part by mass of magnesium hydroxide were blended. Using the resin composition, a Y-joint-shaped pipe joint (90 ° large bend, nominal diameter 100 mm × 100 mm) to be piped to the partition through portion in the building was produced by injection molding.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Example 8]
0.2 parts by mass of magnesium stearate, 0.8 parts by mass of zinc stearate, and average particle diameter with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer Is 0.4 μm of synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) in a proportion of 10 parts by mass. The obtained resin composition was put into an extrusion molding machine, and a pipe-shaped pipe material (length 1,300 mm, outer diameter 140 mm, thickness 7.5 mm, nominal diameter 125 A) having a single layer structure was produced by extrusion molding.

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. Injection molding using a resin composition containing 9 parts by mass, 5 parts by mass of calcium carbonate (surface-treated with a fatty acid), and 0.1 part by mass of borosilicate glass having an average particle size of 20 μm Thus, a Y-joint-shaped pipe joint (90 ° large bend, nominal diameter 125 mm × 125 mm) to be piped to the partition penetrating part in the building was produced.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Example 9]
As a resin composition for an intermediate layer, 0.2 parts by mass of magnesium stearate and 0.8 parts of zinc stearate with respect to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. 4 parts by mass of borosilicate glass having an average particle size of 20 μm and 3.6 parts by mass of synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) having an average particle size of 0.4 μm It mix | blended in the ratio. As a resin composition used for each of the outer layer and the inner layer, lead stearate (manufactured by Mizusawa Chemical Co., Ltd.) is used with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. "NC18ED") was blended at a ratio of 2.0 parts by mass. The obtained resin composition for the intermediate layer and the resin composition for the inner and outer layers were put into an extrusion molding machine, and a pipe-shaped tube (length 1,300 mm) having a three-layer structure (outer layer / intermediate layer / inner layer) was formed by extrusion molding. , Outer diameter 114 mm, thickness 7.1 mm, nominal diameter 100 A, intermediate layer thickness 75%).

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. 8 parts by mass, 7 parts by mass of calcium carbonate (surface-treated with fatty acid) and 2 parts by mass of a borosilicate glass having an average particle size of 20 μm are blended at a ratio of 2 parts by injection molding. A Y-joint-shaped pipe joint (90 ° large bend, nominal diameter 100 mm × 100 mm) to be piped to the inner partition penetrating portion was prepared.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Example 10]
As a resin composition for an intermediate layer, 0.2 parts by mass of magnesium stearate and 0.8 parts of zinc stearate with respect to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. 8 parts by mass of borosilicate glass with an average particle size of 20 μm and 3.6 parts by mass of synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) with an average particle size of 0.4 μm It mix | blended in the ratio. As a resin composition used for each of the outer layer and the inner layer, lead stearate (manufactured by Mizusawa Chemical Co., Ltd.) is used with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer. "NC18ED") was blended at a ratio of 2.0 parts by mass. The obtained resin composition for the intermediate layer and the resin composition for the inner and outer layers were put into an extrusion molding machine, and a pipe-shaped tube (length 1,300 mm) having a three-layer structure (outer layer / intermediate layer / inner layer) was formed by extrusion molding. , Outer diameter 114 mm, thickness 7.1 mm, nominal diameter 100 A, intermediate layer thickness 75%).

  Separately, a Pb heat stabilizer (“TN2-ED” manufactured by Mizusawa Chemical Co., Ltd.) is added to 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 700) which is a polyvinyl chloride homopolymer. 8 parts by weight, Y-joint shaped pipe joint that is piped to a partition through part in a building by injection molding using a resin composition in which calcium carbonate (surface-treated with fatty acid) is blended at a ratio of 3 parts by weight (90 ° large bend, nominal diameter 100 mm × 100 mm) was produced.

  A piping system was formed using the obtained pipe-shaped pipe material and a Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 1.

[Comparative Example 1]
Polyvinyl chloride pipe with a single layer structure that is commercially available as ordinary piping (1 part by weight of Mg-Zn thermal stabilizer, 100 parts by weight of PVC, length 1,300 mm, outer diameter 140 mm, thickness 7.5 mm Nominal diameter 125A) was obtained as a pipe-shaped tube material. In addition, a Y-jointed pipe joint (90 ° large bend, nominal diameter 125 mm × 125 mm) of a polyvinyl chloride pipe joint (containing 2 parts by mass of a Pb heat stabilizer with respect to 100 parts by mass of PVC) was obtained.
A piping system was formed in the same manner as in Example 1 using the obtained pipe-shaped pipe material and the Y-jointed pipe joint. The consideration performance evaluation was performed about this piping system. The obtained results are shown in Table 2.

[Comparative Example 2]
Single-layer polyvinyl chloride pipes marketed as normal piping (100 parts by mass of PVC, 1 part by mass of Mg-Zn heat stabilizer, 1,300 mm in length, 114 mm in outer diameter, 7.1 mm in thickness) Nominal diameter 100A) was obtained as a pipe-shaped tube material.
Further, a resin composition in which 2 parts by mass of a Pb-based heat stabilizer and 1 part by mass of magnesium hydroxide are blended with 100 parts by mass of a polyvinyl chloride resin ("MT700" manufactured by Vitec Corporation, average polymerization degree: 700). Using a product, a Y-joint-shaped pipe joint (90 ° large bend, nominal diameter 100 mm × 100 mm) piped to a partition through portion in a building was produced by injection molding.

  A piping system was formed in the same manner as in Example 1 by using the obtained pipe-shaped pipe material and the obtained Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 2.

[Comparative Example 3]
0.2 parts by mass of magnesium stearate, 0.8 parts by mass of zinc stearate, and average particle diameter with respect to 100 parts by mass of polyvinyl chloride resin (average polymerization degree: 1030) which is a polyvinyl chloride homopolymer Of 0.4 μm of synthetic hydrotalcite (magnesium, aluminum, hydroxide, carbonate, hydrate) was blended at a ratio of 15 parts by mass to prepare a resin composition. The obtained resin composition was put into an extrusion molding machine, and a pipe-shaped pipe material (length 1,300 mm, outer diameter 140 mm, thickness 7.5 mm, nominal diameter 125 A) having a single layer structure was produced by extrusion molding.

  Moreover, pipe joint made of polyvinyl chloride with lead blend (combined with 2 parts by mass of Pb-based heat stabilizer with respect to 100 parts by mass of PVC), which is commercially available as a normal pipe, is a Y-joint shaped pipe joint (90 ° large bend) Nominal diameter 125 mm × 125 mm) was obtained.

  A piping system was formed in the same manner as in Example 1 by using the obtained pipe-shaped pipe material and the obtained Y-jointed pipe joint. The fire resistance performance of this piping system was evaluated. The obtained results are shown in Table 2.

  As is apparent from Tables 1 and 2, the fire-resistant piping systems of Examples 1 to 10 exhibit excellent fire resistance, and it is possible for a long time that flames and smoke turn to the non-heated area partitioned by flooring during combustion. I found out that I can stop it. In addition, the fireproof piping system of the present invention can impart fire resistance to the entire piping system, unlike a piping system in which a fireproofing treatment is applied only to the partition penetration portion with a conventional fireproof and expandable sheet-like coating material.

  On the other hand, in the piping systems of Comparative Examples 1 to 3, the smoke generation time is short and the fire resistance is inferior, and the temperature of the pipe joint surface after 60 minutes from the start of heating is high (comparative example 2 and comparative example 3 cannot be measured). It was found to be inferior in fire resistance.

In other words, the fire-resistant piping system of the present invention, unlike the conventional fire-expandable sheet-like coating material, which has been subjected to fire-proof treatment on the partition through portion, can impart fire resistance to the entire pipe, Very good fire resistance was achieved. In the fire resistance test conducted in the above example, fire resistance was evaluated by a substitute evaluation method in which one end of the piping material was projected in a fireproof furnace, but if it was between slabs on each floor in an actual building Or, if a fire occurs in the construction state where piping is made by penetrating between the partition walls of each floor in the building, it is considered that a further remarkable difference in fire resistance performance appears. That is, the piping material according to the present invention can withstand long-term combustion during combustion, flames and smoke are unlikely to flow outside the combustion chamber, and it is considered that firing can be effectively prevented. Moreover, the piping material of the present invention has a fire resistance performance exceeding 2 hours, and can exhibit excellent performance that does not exist in the past.
In the examples, the nominal diameters of the pipe material and the pipe joint are set to 125A or 100A, respectively. Moreover, since the piping materials and pipe joints of Examples 1 to 10 do not contain thermally expandable graphite, they can be colored and are excellent in recyclability.

  The fireproof piping system of the present invention can be preferably applied to a piping system for buildings and the like, but can be used in a wide range of fields as a piping system in a portion where remarkable fire resistance is required.

X Fireproof test furnace 1 Floor material 2 Stand pipe pipe 3 Pipe joint 4 Heating chamber 5 In-furnace thermocouple 6 Horizontal branch pipe 7 Mortar 20 Pipe material (pipe)
31 Pipe Fitting Main Portion 31a Upper Receiving Port 31b Lower Receiving Port 32 Side Branch Pipe Connecting Portion 32a Receiving Port 41

Claims (7)

  A polyvinyl chloride resin, at least one selected from the group consisting of a Ca—Zn thermal stabilizer, an Mg—Zn thermal stabilizer, and a Ca—Mg—Zn thermal stabilizer, and a synthetic hydrotalcite compound. , A fireproof piping material formed using a resin composition A containing a synthetic hydrotalcite compound in a range of 2 parts by mass or more and 12 parts by mass or less with respect to 100 parts by mass of the polyvinyl chloride resin; A fireproof piping system comprising at least a fireproof pipe joint formed using a resin composition B containing a polyvinyl chloride resin and calcium carbonate.   The fireproof piping system according to claim 1, wherein each of the resin composition A and the resin composition B further contains borosilicate glass.   The fireproof piping system according to claim 1 or 2, wherein the resin composition B further contains magnesium hydroxide.   The said fireproof piping material consists of at least 3 layers which have an outer layer, an intermediate | middle layer, and an inner layer, This intermediate | middle layer is formed using the said resin composition A, The any one of Claim 1 to 3 characterized by the above-mentioned. The fireproof piping system according to item 1.   The fireproof piping system according to claim 4, wherein the outer layer and the inner layer contain a molybdenum-based smoke proofing agent.   A fireproof piping system using the fireproof piping material and the fireproof pipe joint according to any one of claims 1 to 5, wherein one of the fireproof piping materials is the fireproof pipe joint. In the state where one end of the fireproof piping material is exposed 300 mm from the heating side surface of the flooring material, ISO834-1 (a fireproof section based on the revised Building Standard Act constructed on June 1, 2000) In the fire resistance test conducted according to the performance test of the penetrating pipe), when the surface temperature of the pipe joint of the fire resistant pipe joint at a position of 10 mm from the floor material in the non-heated region has passed 60 minutes from the start of the fire resistance test. The fireproof piping system according to any one of claims 1 to 5, wherein the temperature does not exceed 100 ° C.   A piping structure characterized by using the fireproof piping system according to any one of claims 1 to 6 and piping through a structure.

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