JP5150170B2 - Drainage pipe fitting - Google Patents

Description

  The present invention relates to a drainage pipe joint having excellent fire resistance.

Drainage discharged from sanitary equipment etc. on each floor is drained in the pipe shaft from the sanitary equipment etc. on each floor via horizontal branch pipes, not only in multi-layer buildings such as apartment buildings but also in low-rise detached houses. It is collected in a vertical pipe and drained into a sewer.
And in the floor slab penetration part 310 of the drainage pipe 100, as shown in FIG. ', Even when a fire has occurred on the lower floor or the upper floor sandwiching the floor slab 200, from the fire occurrence floor In order to prevent the flow of flames and smoke to the upper floor or the lower floor, the floor slab penetration part 310 of the drainage pipe joint 300 constituting the part of the drainage pipe 100 and the penetration provided in the floor slab 200 The mortar 400 is filled in the gap with the hole 210. In FIG. 7, 500 is a lateral branch pipe, and 320 is a lateral branch pipe connecting portion.

By the way, as the piping material used for such a floor slab penetrating part, fire resistance is required for itself, so that the periphery of the cast iron or synthetic resin inner pipe is surrounded by a fiber reinforced mortar outer pipe. What is called a fireproof two-layer pipe joint (see Patent Document 1) is employed.
However, the above-mentioned cast iron and fire-resistant double-layer drainage pipe joints have a considerable weight, and thus have problems in workability during pipe construction.

In order to solve the above problems, a fire-resistant expansive resin composition in which an inorganic expansive agent and / or an organic expansive agent is blended with a base resin has been proposed (see Patent Document 2). .
This fire-resistant inflatable resin composition is in the form of a sheet or paste, and is wound or applied to the portion of the resin piping material that constitutes the drainage standpipe at the time of construction and inserted into the floor slab through hole. When a fire is generated and the inflatable resin composition for fire protection is heated, the inorganic expansion agent and / or the organic expansion agent expands and is generated between the wall surface of the through hole at that time. With pressure, the softened resin piping material is crushed to block the entire through hole to prevent fire spread.

  However, in the case of the above-mentioned inflatable resin composition for fire protection, it is possible to reduce the weight, but it is necessary to perform a winding operation or a coating operation at the time of construction. There is also a risk that it will not be able to exert its effect.

JP 2005-282330 A Japanese Patent No. 3133683

  In view of the above circumstances, an object of the present invention is to provide a drainage pipe joint that is lightweight and has excellent fire resistance and workability.

To achieve the above object, the drainage pipe joint according to the present invention, Oite to drain coupling having a floor slab penetration portion arranged a floor slab through, it is formed by assembling a plurality of joint components, Among the plurality of joint constituent members, at least the joint constituent member constituting the floor slab penetrating portion contains 1-10 parts by weight of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. It is characterized by being formed of a fire-resistant and heat-expandable resin pipe having a single-layer structure consisting of only a tubular fire-resistant expansion layer made of an expandable resin composition.

  In the drain pipe joint of the present invention, the material of the other joint constituent members may be either metal or resin as long as the joint constituent members constituting at least the floor slab penetrating portion are fireproof and thermally expandable resin pipes. If a change is desired, it is preferable that all joint components are resin molded products. Moreover, the shape of the drainage pipe joint of the present invention includes one having a side branch pipe connecting portion above the floor slab penetrating portion and one having a socket shape.

Also, among the other joint constituent members, those having shapes that cannot be extruded are difficult to be molded if thermally expandable graphite is blended, and therefore, a resin composition not blended with thermally expandable graphite should be used. Is preferred.
Furthermore, the main component resin of the resin composition constituting the joint component member including the fire-resistant and heat-expandable resin pipe is not particularly limited, but a polyvinyl chloride resin having self-extinguishing properties is preferable.

  Examples of the polyvinyl chloride resin include: a polyvinyl chloride homopolymer; a copolymer of a vinyl chloride monomer and a monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer; ) A graft copolymer obtained by graft copolymerizing vinyl chloride with a polymer may be used, and these may be used alone or in combination of two or more. Further, the polyvinyl chloride resin may be chlorinated as necessary.

  The monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer is not particularly limited, and examples thereof include α-olefins such as ethylene, propylene, and butylene; vinyl esters such as vinyl acetate and vinyl propionate; butyl Vinyl ethers such as vinyl ether and cetyl vinyl ether; (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-substituted maleimides such as N-cyclohexylmaleimide and the like may be used, and these may be used alone or in combination of two or more.

  The polymer for graft copolymerization with vinyl chloride is not particularly limited as long as it is for graft copolymerization with vinyl chloride. For example, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-carbon monoxide copolymer Polymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate-carbon monoxide copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, acrylonitrile-butadiene copolymer, polyurethane, chlorinated polyethylene, A chlorinated polypropylene etc. are mentioned, These may be used independently and 2 or more types may be used together.

  The average degree of polymerization of the polyvinyl chloride-based resin is not particularly limited. However, when it becomes smaller, the physical properties of the molded body are lowered, and when it becomes larger, the melt viscosity becomes higher and molding becomes difficult. Preferably, 600-1400 is particularly preferable. The average degree of polymerization refers to a resin obtained by dissolving a polyvinyl chloride resin in tetrahydrofuran (THF), removing insoluble components by filtration, and then removing THF in the filtrate by drying. It means the average degree of polymerization measured according to -6721 “Testing method of vinyl chloride resin”.

  The polymerization method of the polyvinyl chloride resin is not particularly limited, and any conventionally known polymerization method may be employed, and examples thereof include a bulk polymerization method, a solution polymerization method, an emulsion polymerization method, and a suspension polymerization method. It is done.

  The method for chlorinating the polyvinyl chloride resin is not particularly limited, and a conventionally known chlorination method may be employed, and examples thereof include a thermal chlorination method and a photochlorination method.

  Any of the above polyvinyl chloride resins may be used after being crosslinked or modified within a range not impairing the fire resistance performance of the resin composition. In this case, a resin that has been cross-linked or modified in advance may be used. When an additive or the like is blended, the resin may be cross-linked or modified at the same time. . There is no particular limitation on the crosslinking method of the resin, and a conventional crosslinking method of polyvinyl chloride resin, for example, crosslinking using various crosslinking agents, peroxides, crosslinking by electron beam irradiation, water crosslinkable material is used. And the like.

  The fire-resistant and heat-expandable resin pipe of the present invention has only a fire-resistant expansion layer as long as the fire-resistant expansion layer expands when heated by a flame or the like and can close or close the inside of the pipe. Even in the case of a single layer, a multi-layer structure in which a resin layer made of a resin composition not containing expanded graphite is provided on the inner and outer surfaces of the fire resistant expansion layer within a range not impairing the fire resistance performance of the fire resistant expansion layer.

  In the case of the single-layer structure product, the fire-resistant and heat-expandable resin composition for forming the fire-resistant and expandable layer is not particularly limited, but 1 to 10 weights of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. What is contained in the ratio of a part is preferable, What is contained in the ratio of 1-8 weight part is more preferable, What is contained in the ratio of 2-7 weight part is further more preferable. That is, if the thermal expansive graphite is less than 1 part by weight, sufficient thermal expansibility may not be obtained at the time of combustion, and the desired fire resistance may not be obtained. If it expands too much, its shape cannot be maintained and the residue falls off, which may reduce the fire resistance.

On the other hand, in the case of a multilayer structure product, the fire-resistant and heat-expandable resin composition for forming the fire-resistant and expandable layer is not particularly limited, but the heat-expandable graphite is 1 to 15 with respect to 100 parts by weight of the polyvinyl chloride resin. What is contained in the ratio of a weight part is preferable, What is contained in the ratio of 1-12 weight part is more preferable, What is contained in the ratio of 2-10 weight part is further more preferable. That is, if the thermally expandable graphite is less than 1 part by weight of the thermally expandable graphite, sufficient thermal expansion cannot be obtained at the time of combustion, and desired fire resistance cannot be obtained. As a result of the thermal expansion, the shape cannot be maintained and the residue may fall off, resulting in a decrease in fire resistance.
Further, as described above, the fire-resistant expansion layer is formed of a fire-resistant and heat-expandable resin composition containing 1 to 15 parts by weight of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. In the case of a product, it is preferable to have a three-layer structure in which the inner and outer surfaces of the fireproof expansion layer are coated with a polyvinyl chloride resin composition that does not contain a thermally expandable fireproof material.

In the case of a multilayer structure product having a three-layer structure as described above, the thickness of the coating layer covering the inner surface and the outer surface of the refractory tube is preferably 0.2 to 2.0 mm.
That is, if the thickness of the coating layer covering the inner surface and outer surface of the fireproof expansion layer is less than 0.2 mm, the mechanical strength of the tube may be inferior, and if it exceeds 2.0 mm, the fire resistance may decrease. .

The thermally expandable graphite used in the present invention is a powder of natural scale-like graphite, pyrolytic graphite, quiche graphite or the like, and an inorganic acid such as concentrated sulfuric acid, nitric acid or selenic acid, concentrated nitric acid, perchloric acid, perchlorate, perchlorate. With a strong oxidizer such as manganate, dichromate, hydrogen peroxide, etc., after the acid treatment to insert an inorganic acid between the graphite layers, the layer structure of carbon obtained by adjusting the pH is maintained. It is preferable to use a thermally expandable graphite which is a crystalline compound and adjusted to pH 1.5 to 4.0 and a heat expandable graphite having a 1.3 times expansion temperature of 180 ° C. to 240 ° C.
That is, if the pH of the heat-expandable graphite is less than 1.5, the acidity is too strong to easily cause corrosion of the molding apparatus. If the pH exceeds 4.0, the effect of promoting the carbonization of the polyvinyl chloride resin It may become thin and sufficient fire resistance performance may not be obtained.

  The pH adjustment method of the thermally expandable graphite is not particularly limited, but normally, in the state of acid treatment that inserts an inorganic acid between the layers of the raw graphite as described above, the pH is 1 or less. There is a method in which the graphite after acid treatment is washed with water to remove the acid remaining on the surface of the graphite and then dried. That is, in order to increase the pH of the thermally expandable graphite, water washing and drying may be repeated.

On the other hand, if the expansion temperature of the heat-expandable graphite is less than 180 ° C, the heat-expandable graphite may expand during molding, which causes poor appearance of the tube and fire resistance during combustion. When the 1.3 times expansion temperature of the thermally expandable graphite exceeds 240 ° C., there is no fear that the expansion of the thermally expandable graphite will start during molding, After the thermal decomposition (foaming) of the polyvinyl chloride resin progresses and the flexibility of the polyvinyl chloride resin decreases, the thermally expandable graphite expands. There is a risk that it will not be able to withstand the expansion of graphite and will collapse apart.
The 1.3 times expansion temperature is a temperature at which the expansion ratio of the thermally expandable graphite after heating the sample of the thermally expandable graphite for 30 minutes with the inside of the heating furnace becomes a constant temperature is 1.3 or more. means. Further, the expansion ratio can be obtained by dividing the volume of the sample after heating by the volume of the sample before heating.

  Although the particle diameter of the said thermally expansible graphite is not specifically limited, Preferably it is 100-400 micrometers, More preferably, it is 120-350 micrometers. That is, if the particle size becomes too fine, the expansion rate of the refractory resin composition may decrease. On the other hand, if the particle size becomes too large, the structure expands too much due to heating, the shape cannot be maintained, the residue falls off, the fire resistance decreases, and the fire resistant resin composition is used as a piping material. The physical properties, such as tensile strength and flat strength, may decrease, and the mechanical strength necessary for the tube material may not be obtained.

In addition, the fire-resistant and heat-expandable resin composition for forming the fire-resistant expansion layer has a stabilizer, an inorganic filler, a flame retardant, a lubricant, a processing aid, an impact modifier, and the like within a range not impairing the object of the present invention. Additives such as a quality agent, a heat resistance improver, an antioxidant, a light stabilizer, an ultraviolet absorber, a pigment, a plasticizer, and a thermoplastic elastomer may be added.
The stabilizer is not particularly limited, and examples thereof include lead stabilizers, organotin stabilizers, higher fatty acid metal salts, and the like, and these can be used alone or in combination.

Examples of lead stabilizers include lead white, basic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, silica gel coprecipitated silicic acid. Lead, dibasic lead stearate, lead stearate, lead naphthenate are mentioned.
Examples of the organotin stabilizer include mercaptides such as dibutyltin mercapto, dioctyltin mercapto, and dimethyltin mercapto; And 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, and stearic acid. Cadmium, cadmium laurate, cadmium ricinoleate, cadmium naphthenate, cadmium 2-ethylhexoate, zinc stearate, zinc laurate, zinc ricinoleate, zinc 2-ethylhexoate, lead stearate, lead dibasic stearate, naphthene Lead acid is mentioned.

The blending ratio of the stabilizer is not particularly limited, but is preferably 0.3 to 5.0 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin.
That is, if the blending ratio of the stabilizer is less than 0.3 parts by weight, it is difficult to ensure the thermal stability of the polyvinyl chloride resin at the time of molding, and there is a possibility that carbide is likely to be produced during molding. If the amount exceeds 0.0 parts by weight, the promotion of carbonization of the polyvinyl chloride resin during combustion may be hindered, and sufficient fire resistance may not be obtained.

The inorganic filler is not particularly limited. For example, silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, magnesium hydroxide , Aluminum hydroxide, 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 metals Candidates include potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dewatered sludge, etc. Of these, basic inorganic fillers such as calcium carbonate, calcium silicate, calcium hydroxide, calcium oxide, magnesium carbonate, magnesium hydroxide, magnesium oxide, barium carbonate, aluminum hydroxide, zinc oxide, zinc hydroxide and iron oxide Is preferably used.
These may be used alone or in admixture of two or more.

  The blending ratio of the inorganic filler is not particularly limited, but is preferably 0.3 to 50 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin, and 2 to 5 parts by weight. It is preferable. That is, if the inorganic filler is less than 0.3 parts by weight, the aggregate function may not be achieved during combustion, and the shape may not be maintained, and the residue may drop, resulting in a decrease in fire resistance. If the amount exceeds 50 parts by weight, the ratio of the polyvinyl chloride resin to the whole composition becomes low, so that the tensile strength may be lowered.

  In particular, when using the heat-expandable graphite whose pH is adjusted to 1.5 to 4.0, the basic inorganic filler is added to 0.3 to 100 parts by weight of the polyvinyl chloride resin. It is preferable to mix | blend in the ratio of 5.0 weight part. That is, when the blending ratio of the basic inorganic filler is less than 0.3 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin, the thermal stability of the polyvinyl chloride resin at the time of molding cannot be secured, and molding is performed. If the basic compound exceeds 5.0 parts by weight, the promotion of carbonization of the polyvinyl chloride resin during combustion may be hindered, and the fire resistance may not be significantly improved. There is.

  The flame retardant is not particularly limited as long as it is for enhancing flame retardancy during combustion. For example, hydroxides such as aluminum hydroxide and magnesium hydroxide, hydrotalcite, antimony dioxide, and antimony trioxide. Antimony oxides such as antimony pentoxide, molybdenum compounds such as molybdenum trioxide, molybdenum disulfide, ammonium molybdate, bromine compounds such as tetrabromobisphenol A, tetrabromoethane, tetrabromoethane, tetrabromoethane, triphenylphosphine Phosphorus compounds such as phosphate and ammonium polyphosphate, calcium borate, zinc borate and the like can be mentioned, but antimony trioxide is particularly preferable as a combustion suppressing effect of polyvinyl chloride. This is because the antimony compound has a very strong synergistic effect in producing a halogenated antimony compound under high temperature conditions and suppressing the combustion cycle in the presence of a halogen compound.

  By using a flame retardant in combination, the heat insulation effect due to the expansion of the thermally expandable graphite and the combustion delay effect due to the flame retardant exhibit a synergistic effect during combustion, and the fire resistance can be improved more efficiently. The number of added flame retardants is not particularly limited, but it is preferably 1 to 20 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin. If the flame retardant is less than 1 part by weight, it is difficult to obtain a sufficient synergistic effect, and if the flame retardant is added in excess of 20 parts by weight, the moldability and physical properties may be significantly reduced. is there.

  The heat stabilization aid is not particularly limited, and examples thereof include epoxidized soybean oil, phosphate ester, polyol, hydrotalcite, and zeolite. 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 lowering the flow viscosity of the molten resin during molding and preventing frictional heat generation. The internal lubricant is not particularly limited, and examples thereof include butyl stearate, lauryl alcohol, stearyl alcohol, epoxy soybean oil, glycerin monostearate, stearic acid, and bisamide. These may be used alone or in combination of two or more.
The external lubricant is used for the purpose of increasing the sliding effect between the molten resin and the metal surface during molding. The external lubricant is not particularly limited, and examples thereof include paraffin wax, polyolefin wax, ester wax, and montanic acid wax. These may be used alone or in combination of two or more.

  The processing aid is not particularly limited, and examples thereof include acrylic processing aids such as alkyl acrylate-alkyl methacrylate copolymers having a weight average molecular weight of 100,000 to 2,000,000. The acrylic processing aid is not particularly limited, and examples thereof 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.

  The impact modifier is not particularly limited, and examples thereof include methyl methacrylate-butadiene-styrene copolymer (MBS), chlorinated polyethylene, and acrylic rubber.

  The heat resistance improver is not particularly limited, and examples thereof include α-methylstyrene-based and N-phenylmaleimide-based resins.

  It does not specifically limit as said antioxidant, For example, a phenolic antioxidant etc. are mentioned.

  The light stabilizer is not particularly limited, and examples thereof include hindered amine light stabilizers.

  The ultraviolet absorber is not particularly limited, and examples thereof include salicylic acid ester-based, benzophenone-based, benzotriazole-based, and cyanoacrylate-based ultraviolet absorbers.

  The pigment is not particularly limited, and examples thereof include organic pigments such as azo, phthalocyanine, selenium, and dye lakes; oxides, molybdenum chromates, sulfides / selenides, ferrocyanides, etc. Examples include inorganic pigments.

  In addition, a plasticizer may be added to the polyvinyl chloride resin composition, but since it may reduce the heat resistance and fire resistance of the molded product, it is not preferable to use a large amount. The plasticizer is not particularly limited, and examples thereof include dibutyl phthalate, di-2-ethylhexyl phthalate, and di-2-ethylhexyl adipate.

  The thermoplastic elastomer is not particularly limited. For example, acrylonitrile-butadiene copolymer (NBR), ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl acetate-carbon monoxide copolymer (EVACO), Vinyl chloride-based thermoplastic elastomers such as vinyl chloride-vinyl acetate copolymer and vinyl chloride-vinylidene chloride copolymer, styrene-based thermoplastic elastomer, olefin-based thermoplastic elastomer, urethane-based thermoplastic elastomer, polyester-based thermoplastic elastomer, Examples thereof include polyamide-based thermoplastic elastomers. These thermoplastic elastomers may be used alone or in combination of two or more.

  The drainage pipe joint according to the present invention is a drainage pipe joint having a floor slab penetrating portion arranged through the floor slab, formed by assembling a plurality of joint constituent members, and among the plurality of joint constituent members, At least the joint constituting member constituting the floor slab penetrating portion is formed of a fire-resistant and heat-expandable resin pipe having at least a tubular fire-resistant expansion layer made of the fire-resistant and heat-expandable resin composition. In the event of a fire, the pipe slab is blocked at the floor slab penetrating part, and excellent fire resistance performance is exhibited such that the flow of flames, smoke, etc. from the fire occurrence floor to other floors can be blocked. And since the layer which consists of a fire-resistant heat-expandable resin composition is previously provided, there is no problem of a winding defect or a coating defect, and a reliable fire-proof construction can be performed.

  In addition, since at least the joint constituent member constituting the floor slab penetrating portion is a fire-resistant and heat-expandable resin pipe and is assembled with other joint constituent members, a fire-resistant and heat-expandable resin composition that is difficult to be injection-molded is also used. be able to.

And when using a single-layer structure product having only a fire-resistant expansion layer as the fire-resistant and heat-expandable resin pipe, as the fire-resistant and heat-expandable resin composition, 1 to 100 parts by weight of the polyvinyl chloride-based resin, If a resin containing 10 parts by weight is used, a self-extinguishing polyvinyl chloride resin is used as the base resin, so that the combustion rate is effectively delayed and the flame is propagated during combustion. Speed can be reduced. In addition, since the polyvinyl chloride resin has a property of foaming at the initial stage of combustion, there is an advantage that the thermally expandable graphite is easily expanded.
Further, since the heat-expandable graphite itself is difficult to burn and expands due to heat and exhibits a heat insulation effect, the combustion rate is further effectively delayed.

On the other hand, when a three-layer structure product in which a coating layer is provided on the inner and outer surfaces of the fire-resistant expansion layer is used as the fire-resistant and heat-expandable resin pipe, 1 to 15 of heat-expandable graphite is added to 100 parts by weight of the polyvinyl chloride resin. A fire-resistant expansion layer comprising a fire-resistant and heat-expandable resin composition contained in parts by weight, and a coating comprising a polyvinyl chloride resin composition not containing heat-expandable graphite provided so as to cover the inner and outer surfaces of the fire-resistant expansion layer The structure composed of layers has the same effect as a single-layer structure product, and is excellent in moldability, and can be continuously produced with high dimensional accuracy by, for example, injection molding or extrusion molding.
Also, the coating layer on the outer surface side increases the adhesiveness to the mortar filled between the through hole of the floor slab and the pipe due to the thermal expansion of the pipe, and from the fire occurrence floor side through the gap between the pipe and the mortar. Inflow of flames and smoke to the non-fire floor can be more reliably prevented.
Furthermore, since the coating layer is made of a polyvinyl chloride resin composition not containing thermally expandable graphite, the inner and outer surfaces of the pipe can be made smooth, and the product appearance and drainage performance are excellent. be able to.

  If all the joint constituent members are made of resin, the weight can be reduced most. That is, it can be made more excellent in piping workability. And even if it is not a resin-lined steel pipe, fireproof double-layer pipe or cast iron pipe that has been conventionally used for horizontal branch pipes, vertical pipes, non-fireproof vinyl chloride resin pipes that are cheaper and have excellent workability and drainage performance, etc. It is possible to use a resin tube.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 to 3 show a first embodiment of a drain pipe joint according to the present invention.

  As shown in FIG. 1, the drainage pipe joint 1 includes a main body 2 having the same inner diameter from the upper vertical pipe connection portion 11 a to the lower vertical pipe connection portion 13 b, and two side branch pipe connection portions 3. The upper member 11 which consists of the upper end part of the main-body part 2 which has the type | mold upper side pipe connection part 11a, and the two horizontal branch pipe connection parts 3, the intermediate member 12 which comprises the intermediate part of the main-body part 2, and a main-body part It is obtained by assembling and bonding and integrating the three joint constituent members with the lower member 13 having the lower vertical pipe connecting portion 13b having a flange shape that constitutes the lower end portion of the two.

More specifically, the upper member 11 is formed of a polyvinyl chloride resin composition that does not contain thermally expandable graphite. The upper member connection portion 11a, the main body upper tube portion 11b, and the main body upper tube Two side branch pipe connecting portions 3 are integrally provided on the side surface of the portion 11b so as to communicate with the main body upper side cylinder portion 11b.
Moreover, the fitting part 11c of the intermediate member 12 mentioned later is provided in the lower end of the main-body-part upper cylinder part 11b.

  The lower member 13 is formed of a polyvinyl chloride resin composition that does not contain thermally expandable graphite, and includes a fitting portion 13a of an intermediate member 12 to be described later at the upper end, below the fitting portion 13a, A lower vertical pipe connecting portion 13b is provided on the lower side so as to have an inner diameter substantially the same as the inner diameter of the drainage vertical pipe to be connected.

  The intermediate member 12 serves as a floor slab penetrating portion, and as shown in FIG. 2, the inner and outer surfaces of the fireproof expansion layer 12a made of a tubular fireproof thermal expansion resin composition are covered with the coating layers 12c and 12b. Has a pipe shape with a length of 350 mm to 600 mm, and the inner diameter thereof is substantially the same as the inner diameter of the drainage pipe to be connected.

1 to 15 parts by weight of thermally expandable graphite whose pH is adjusted to 1.5 to 4.0 with respect to 100 parts by weight of the polyvinyl chloride resin is included in the fire resistant and thermally expandable resin composition constituting the fire resistant expansion layer 12a. The stabilizer is blended at a ratio of 0.3 to 5.0 parts by weight.
The coating layers 12b and 12c are each made of a polyvinyl chloride resin composition that does not contain thermally expandable graphite.
The upper member 11, the intermediate member 12, and the lower member 13 have the upper end portion of the intermediate member 12 fitted into the fitting portion 11 c of the upper member 11 with an adhesive for vinyl chloride resin, and the lower end portion of the intermediate member 12. Are integrated with each other by being fitted to the fitting portion 13a of the lower member 13 via an adhesive for vinyl chloride resin.

As shown in FIG. 3, the drainage pipe joint 1 is disposed so that a portion formed by the intermediate member 12 of the main body 2 penetrates the through hole 51 of the floor slab 5, and the through hole 51, the intermediate member 12, The mortar 52 is filled in the gap, and constitutes a part of the two-pipe drainage pipe in the same manner as a conventional drainage pipe joint. In FIG. 3, 6 is a horizontal branch pipe, which is a vinyl chloride resin pipe as a non-refractory resin pipe. The vertical pipe 4 is also a vinyl chloride resin pipe as a non-refractory resin pipe.
And this drain pipe joint 1 consists of the upper member 11, the intermediate member 12, and the lower member 13, and since it is all formed with the resin composition, it is lightweight and excellent in workability. In addition, the manufacturing cost can be reduced.

  And since the intermediate member 12 used as a floor slab penetration part is equipped with the fireproof thermal expansion resin composition layer 12a in the middle of the thickness direction, when a fire occurs on either floor across the floor slab 5, Due to the thermal expansion of the expandable graphite, the intermediate member 12 can be blocked and shielded in the floor slab through-hole 51, and the sealing effect between the intermediate member 12 and the outer mortar can be expressed, and the floor slab 5 It is possible to effectively prevent the flame and smoke from turning to the upper floor or the lower floor.

In addition, since not only the fire-resistant expansion layer 12a but also the coating layers 12b and 12c contain a self-extinguishing polyvinyl chloride resin, the combustion speed is effectively delayed, and the flame propagation speed during combustion Can be suppressed. Furthermore, since the polyvinyl chloride resin has a property of foaming in the early stage of combustion, there is an advantage that the thermally expandable graphite is easily expanded.
Furthermore, since the heat-expandable graphite is adjusted to pH 1.5 to 4.0, the hydrogen chloride elimination reaction of the polyvinyl chloride resin is promoted, and the polyvinyl chloride resin is carbonized. It is promoted more effectively and fire resistance is improved.

  The length of the fireproof expansion layer 12a in the tube axis direction may be shorter than the entire length of the floor slab through hole 51 as long as it can be thermally expanded and closed in the floor slab through hole 51. It is preferably arranged over the entire length. Therefore, as described above, if the length of the intermediate member 12 is about 350 mm to 600 mm, it is possible to cope with a concrete floor slab having a thickness of 200 mm as well as a concrete floor slab having a thickness of 350 mm.

FIG. 4 shows a second embodiment of a drain pipe joint according to the present invention.
As shown in FIG. 4, the drainage pipe joint 7 has a socket shape in which an upper flange connecting member 71, an intermediate member 72 serving as a floor slab penetrating portion, and a lower flange connecting member 73 are bonded and integrated. The upper flange connection member 71 and the lower flange connection member 73 are formed of a polyvinyl chloride resin composition that does not contain thermally expandable graphite, and the intermediate member 72 has the same three layers as the intermediate member 12 of the drainage pipe joint 1. The drainage pipe joint 1 is the same as the above except that it is formed of a pipe having a structure.

FIG. 5 shows a third embodiment of the drainage pipe joint according to the present invention.
As shown in FIG. 5, the drainage pipe joint 8 has a single socket shape in which an upper flange connecting member 81 and a cylindrical member 82 which is a floor slab penetrating portion are bonded and integrated, and the upper flange connecting member 81 is formed of a polyvinyl chloride resin composition not containing thermally expandable graphite, and the cylindrical member 82 is formed of a pipe having a three-layer structure similar to the intermediate member 12 of the drainage pipe joint 1. The drainage pipe joint 1 is the same as the above.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the intermediate member 12 includes the coating layer so as to cover the inner surface and the outer surface of the fireproof and thermally expandable resin composition layer.
The coating layer may be provided on either the inner surface or the outer surface, or may not be provided.
In the above embodiment, the vertical pipe connecting portion has a flange-type connection structure, but may have a receiving shape.
In the above embodiment, there are two horizontal branch pipe connecting portions, but there may be one horizontal branch pipe connecting portion or three or more horizontal branch pipe connecting portions.

  Hereinafter, specific examples of the present invention will be described.

(Examples 1 to 31 and Comparative Example 1)
Pipes having an outer diameter of 114 mm, a thickness of 6.6 mm, and a nominal diameter of 100 A having the composition shown in Tables 1 to 5 were obtained by extrusion using a generally used extruder.
In addition, in the Example shown in Table 1-Table 5, the following were used as a compounding material of the resin composition which comprises each layer.
Vinyl chloride resin: Tokuyama Sekisui Industry Co., Ltd., trade name TS1000R
Lead stearate ・ ・ ・ Mizusawa Chemical Co., Ltd., trade name Stabinex NC18
Octyl tin mercapto ・ ・ ・ Sansha Co., Ltd., ONE-100F
Ca / Zn composite stabilizer ・ ・ ・ Made by Kago Chemical Co., Ltd., trade name NWP-6000
Lubricant ・ ・ ・ Mitsui Chemicals, trade name High Wax 4202E
Calcium carbonate (inorganic filler) ・ ・ ・ Shiraishi Calcium Co., Ltd.
Magnesium hydroxide (inorganic filler) ・ ・ ・ Kyowa Chemical Industry Co., Ltd., trade name KISUMA5A
Hydrotalcite: Kyowa Chemical Industry Co., Ltd., trade name: DHT-4A
Epoxidized soybean oil: ADEKA, brand name Adeka Sizer O130P
Thermally expansive graphite: Tosoh Corporation, product number GREP-EG

(Example 32 to Example 80)
A pipe having an outer diameter of 114 mm, a thickness of 6.6 mm, and a nominal diameter of 100 A, which has a coating layer on at least one of the inner and outer surfaces of the fireproof expansion layer having the composition shown in Tables 6 to 13 below, is generally used. Obtained by coextrusion with an extrusion machine.
In addition, in the Example shown to Tables 6-13, the following were used as a compounding material of the resin composition which comprises each layer.
Vinyl chloride resin: Taiyo PVC Co., Ltd., trade name: TH1000
Lead-based stabilizer ・ ・ ・ Product name SL-1000
Lubricant ・ ・ ・ Mitsui Chemicals, trade name High Wax 4202E
Calcium carbonate (inorganic filler) ・ ・ ・ Shiraishi Calcium Co., Ltd.
Magnesium hydroxide (inorganic filler) ・ ・ ・ Kyowa Chemical Industry Co., Ltd., trade name KISUMA5A
Hydrotalcite: Kyowa Chemical Industry Co., Ltd., trade name: DHT-4A
Epoxidized soybean oil: ADEKA, brand name Adeka Sizer O130P
Thermally expansive graphite: Tosoh Corporation, trade name GREP-EG

  About the pipe produced in the said Examples 1-80 and the comparative example 1, the fire resistance evaluation shown below and physical-property evaluation were performed, respectively, and the result was combined with Table 1-Table 8, and was shown. In the case of a multilayer structure, the thickness and thickness ratio of each layer are also shown.

(Fire resistance evaluation)
A fire resistance test (according to ISO 834-1, an evaluation method for the fire resistance performance test of the revised Building Standard Law, which was enacted on June 1, 2000) was conducted using the fire resistance test furnace X shown in FIG.
As the flooring Y, a PC (precast concrete) panel having a thickness of 100 mm was used. The test pipe P was passed through the partition penetration portion R provided in the flooring Y, exposed 300 mm in the heating chamber Z, and exposed 800 mm outside the flooring Y.
Burners V and V are installed on the side wall of the heating chamber Z. Further, a thermocouple Q for temperature measurement is installed in the vicinity of the tip of the test piping material P.
After the heating was started, the time (smoke generation time) until smoke was emitted from the gap between the partition through portion R and the test piping material P was measured. The smoke generation time was examined according to the criteria of the 8th division of the Fire Service Act.

(Evaluation of the physical properties)
Dumbbell test pieces are arbitrarily cut out from the pipes obtained in the above (Example 1) to (Example 80) and (Comparative Example 1), and the obtained test pieces are subjected to a tensile test (evaluation temperature 23) according to JISK7113 ° C). In addition, in order to determine whether or not the practical performance as a tube is satisfied, the one having a tensile strength of 45 (MPa) or more at 23 ° C. is ◎ (excellent), the one having 30 (MPa) or more is ○ (pass), Those less than 30 (MPa) were evaluated as x (failed).

1 is a partially cutaway cross-sectional view showing a first embodiment of a drainage pipe joint according to the present invention. It is sectional drawing which expands and shows the intermediate member of the drain pipe joint of FIG. It is a figure explaining the construction state of the drain pipe joint of FIG. It is a partially cutaway sectional view showing a 2nd embodiment of a drainage pipe joint concerning the present invention. It is a partially cutaway sectional view showing a 3rd embodiment of a drainage pipe joint concerning the present invention. It is a figure explaining the method of the fire resistance test of the pipe obtained in the Example. It is a figure explaining the construction structure of the conventional drainage vertical line.

Explanation of symbols

1,7,8 Drainage pipe joint 11 Upper member (other members)
12 Intermediate member (floor slab penetration and fireproof resin composition layer)
12a Fire-resistant resin composition layer 13 Lower member (other members)
11a Vertical pipe connection part 11b Main part upper cylinder part (communication part)
13b Vertical pipe connection part 2 Main body part 3 Horizontal branch pipe connection part 4 Drainage vertical pipe 5 Floor slab 51 Floor slab through hole 6 Horizontal branch pipe 71 Upper flange connection member (other members)
72 Intermediate member (floor slab penetration and fireproof resin composition layer)
73 Lower flange connection member (other members)
81 Upper flange connection member (other members)
82 Cylindrical member (floor slab penetration and fire-resistant resin composition layer)

Claims (3)

Oite to drain coupling having a floor slab penetration portion arranged a floor slab through,
A joint constituent member formed by assembling a plurality of joint constituent members and constituting at least the floor slab penetrating portion of the plurality of joint constituent members is made of thermally expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. A drainage pipe joint characterized by being formed of a fire-resistant and heat-expandable resin pipe having a single-layer structure composed only of a fire-resistant and thermally expandable resin layer made of a fire-resistant and thermally expandable resin composition contained in a proportion of 1 to 10 parts by weight . The drain pipe joint according to claim 1, wherein the fire-resistant and heat-expandable resin composition contains an inorganic filler in a proportion of 2 to 5 parts by weight with respect to 100 parts by weight of the polyvinyl chloride resin. The drain pipe joint according to claim 1 or 2 , wherein all joint constituent members are made of resin.

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