JP2006161982A - Refractory multilayer tube and method for manufacturing the same - Google Patents

Abstract

A fireproof multilayer pipe excellent in sound insulation and workability and a method for manufacturing the same are provided.
[1] A fireproof multilayer pipe comprising: a synthetic resin pipe; and a layer made of a thermally expandable fireproof material having a soundproofing property provided on an outer periphery of the synthetic resin pipe. [2] The method for producing a fireproof multilayer pipe according to [1], wherein a heat-expandable heat-expandable fireproof material is spirally wound around the synthetic resin pipe. [3] The method for producing a fireproof multilayer tube according to [1], wherein a multilayer resin pipe is formed by co-extrusion of a synthetic resin and the heat-expandable heat-expandable fireproof material.
[Selection] Figure 1

Description

  The present invention relates to a fireproof multilayer pipe excellent in soundproofing and workability and a method for producing the same.

A partition part such as a floor, wall, or partition of a building is provided with a through hole (section through part) for penetrating the pipe, and a pipe such as a wire pipe, a drain pipe, or a duct is passed through the through hole. By filling and closing the gap after passing the pipe through the through hole with a filler in order to provide fire resistance, a fire prevention compartment penetration structure is formed in the partition of the building.
When a synthetic resin pipe is used as a pipe material penetrating the partition portion, a multilayer pipe having a slate pipe or a metal pipe as a sheath pipe outside the pipe is employed to provide fire resistance. However, when the multilayer pipe is used as a drain pipe, the slate pipe and the sheath pipe of the metal pipe are effective in imparting fire resistance, but there is a problem that the effect of reducing noise generated by running water in the drain pipe is not sufficient. there were.
In order to solve this problem, a refractory three-layer pipe with an inner pipe of a synthetic resin pipe, an intermediate layer for imparting soundproof performance to the inner pipe, and a layer made of a noncombustible material for covering the intermediate layer is proposed. (Patent Document 1).
JP 2001-74191 A

However, since the fire-resistant three-layer pipe has a large diameter, the through-hole provided in the partition part of the building has to be enlarged, and there is a problem in workability at the construction site.
An object of the present invention is to provide a fireproof multilayer pipe excellent in sound insulation and workability and a method for producing the same.

As a result of intensive studies to solve the above problems, the present inventor has found that a synthetic resin tube having a layer made of a thermally expandable refractory material having soundproofing properties meets the object of the present invention, and completed the present invention. It came to do.
That is, the present invention
[1] a synthetic resin tube;
A layer made of a thermally expandable refractory material having soundproofing provided on the outer periphery of the synthetic resin tube;
Providing a fireproof multilayer tube consisting of
[2] The method for producing a fireproof multilayer pipe according to claim 1, wherein the heat-expandable heat-expandable fireproof material is spirally wound around the synthetic resin pipe.
[3] The method for producing a fireproof multilayer pipe according to the above [1], wherein a multilayer pipe shape is formed by co-extrusion of the synthetic resin and the heat-expandable heat-expandable fireproof material. Is what
[4] The layer according to [1], wherein the layer made of a heat-expandable fire-resistant material having soundproofing properties is composed of a layer made of a soundproof material and a layer made of a heat-expandable material. Providing a fireproof multilayer tube
[5] The fireproof material according to any one of the above [2] or [3], wherein two materials of a soundproof material and a heat-expandable material are used as the heat-expandable heat-expandable fireproof material. A method for manufacturing a multilayer tube is provided.

ADVANTAGE OF THE INVENTION According to this invention, the fireproof multilayer tube excellent in sound insulation and workability, and its manufacturing method can be provided.

The best mode for carrying out the present invention will be described below with reference to FIG.
FIG. 1 is a main cross-sectional perspective view of a refractory multilayer pipe illustrating one embodiment of the present invention. In FIG. 1, 1 indicates a synthetic resin tube, and 2 indicates a layer made of a thermally expandable refractory material having soundproofing properties. In FIG. 1, a layer 2 made of a heat-expandable fire-resistant material having soundproofing properties is provided on the outer periphery of a synthetic resin tube 1.

Although there is no restriction | limiting in particular as a pipe material used for the said synthetic resin pipe, When the said synthetic resin pipe is a water distribution pipe, a pipe material which consists of synthetic resins, such as a polyethylene pipe, a polybutene pipe, and a vinyl chloride pipe, from the surface of workability Is preferable.
As the synthetic resin tube, one having an outer diameter in the range of 25 to 200 mm is usually used.

  Moreover, the layer 2 which consists of the heat-expandable fireproof material which has the said soundproofing property normally has the thickness of the range of 1-10 mm.

Next, the heat-expandable heat-expandable fireproof material used for the fireproof multilayer tube of the present invention will be described.
Specific examples of the thermally expandable refractory material having soundproofing properties include a resin composition containing a thermally expandable inorganic material and an inorganic filler having a true specific gravity of 3.0 or more.

  Examples of the resin of the resin composition containing the thermally expansive inorganic substance and the inorganic filler include polyolefin resins such as polypropylene resins, polyethylene resins, poly (1-) butene resins, polypentene resins, and polystyrene resins. Thermoplastic resins such as resins, acrylonitrile-butadiene-styrene resins, polycarbonate resins, polyphenylene ether resins, acrylic resins, polyamide resins, polyvinyl chloride resins; natural rubber (NR), isoprene rubber (IR), Butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber ( EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), polyvulcanized rubber (T), silicone rubber (Q), fluoro rubber (FKM, FZ), urethane rubber (U), etc. Substances: Thermosetting resins such as polyurethane, polyisocyanate, polyisocyanurate, phenol resin, epoxy resin and the like.

  Among these resins, from the viewpoint of maintaining a low elastic modulus, polyolefin resins are preferable, and polyethylene resins are particularly preferable. Examples of the polyethylene resin include an ethylene homopolymer, a copolymer containing ethylene as a main component, a mixture thereof, an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, and the like. Examples of the ethylene-based copolymer include an ethylene-α-olefin copolymer having an ethylene portion as a main component, and examples of the α-olefin include 1-hexene and 4-methyl. Examples include -1-pentene, 1-octene, 1-butene, and 1-pentene. Specific products of the ethylene-α-olefin copolymer include commercial products such as trade names “CGCT”, “affinity”, “engage” manufactured by Dow Chemical, and “EXACT” manufactured by Exxon Chemical. It is done. These polyolefin resins may be used alone or in combination of two or more.

Moreover, in order to make easy lamination | stacking with the synthetic resin pipe | tube and the layer which consists of a heat-expandable fireproof material which has the soundproofness used for this invention, it is preferable that the said resin composition is provided with adhesiveness.
From such a viewpoint, it is preferable to add a tackifier resin, a plasticizer, oils and fats, a polymer low polymer, or the like to the rubber substance.

  Examples of the tackifying resin include rosin, rosin derivative, dammar resin, copal, coumarone-indene resin, polyterpene, non-reactive phenol resin, alkyd resin, petroleum hydrocarbon resin, xylene resin, epoxy resin and the like. .

  Although it is difficult for the plasticizer to exhibit tackiness alone, it is possible to improve the tackiness in combination with the tackifier resin. Specifically, for example, a phthalate ester plasticizer, a phosphate ester plasticizer, an adipate ester plasticizer, a sebacate ester plasticizer, a ricinoleate ester plasticizer, a polyester plasticizer, and an epoxy plasticizer Agents, chlorinated paraffin, and the like.

  Since the oils and fats have the same action as the plasticizer, they can be used for the purpose of imparting plasticity and an adhesion regulator. Specific examples include animal oils, vegetable oils, mineral oils, and silicone oils.

  The low polymer polymer can be used for the purpose of improving cold resistance and controlling flow, in addition to providing tackiness. Specifically, for example, low polymers of the rubber materials exemplified above can be used.

  Furthermore, from the viewpoint of the combustion resistance of the resin itself, a phenol resin and an epoxy resin are preferable. The epoxy resin is not particularly limited, but is basically a resin obtained by reacting a monomer having an epoxy group with a curing agent.

  As a monomer having an epoxy group, for example, as a bifunctional glycidyl ether type, polyethylene glycol type, polypropylene glycol type, neopentyl glycol type, 1,6-hexanediol type, trimethylolpropane type, propylene oxide-bisphenol A type Hydrogenated bisphenol A type, bisphenol A type, bisphenol F type, etc., and glycidyl ester type include hexahydrophthalic anhydride type, tetrahydrophthalic anhydride type, dimer acid type, p-oxybenzoic acid type, etc. Examples of the polyfunctional glycidyl ether type include a phenol novolak type, an ortho cresol type, a DPP novolak type, and a dicyclopentadiene / phenol type. These may be used alone or in combination of two or more.

  Examples of the curing agent include polyamines, acid anhydrides, polyphenols, and polymercaptans as polyaddition types, and tertiary amines, imidazoles, and Lewis acid complexes as catalyst types. The curing method of these epoxy resins is not particularly limited, and can be performed by a known method.

Among epoxy resins, when long-chain alkyl containing epoxy resins or epoxy resins with a long distance between crosslinks are used as the base resin, not only can the elastic modulus be kept low, but also the carbonization rate can be kept high and the fire resistance performance can be kept at a high level at the same time. To preferred. In particular, an epoxy resin to which flexibility is imparted by the following method is preferable in consideration of compatibility with a low elastic modulus.
(1) Increase the molecular weight between cross-linking points.
(2) Reduce the crosslinking density.
(3) Introducing a soft molecular structure.
(4) A plasticizer is added.
(5) Introducing an interpenetrating network (IPN) structure.
(6) Disperse and introduce rubber-like particles.
(7) Introducing microvoids.

  The method (1) is a method in which the distance between the cross-linking points is increased by causing a reaction using an epoxy monomer having a long molecular chain and / or a curing agent in advance, thereby expressing flexibility. For example, polypropylene diamine or the like is used as the curing agent.

  The method (2) is a method of developing flexibility by reducing the crosslinking density in a certain region by reacting with an epoxy monomer and / or a curing agent having a small number of functional groups. As the curing agent, for example, a bifunctional amine is used, and as the epoxy monomer, for example, a monofunctional epoxy is used.

  The method (3) is a method of introducing flexibility by introducing an epoxy monomer having a soft molecular structure and / or a curing agent. As the curing agent, for example, a heterocyclic diamine, and as an epoxy monomer, for example, alkylene diglycol diglycidyl ether or the like is used.

  The method (4) is a method in which a non-reactive diluent such as DOP, tar, petroleum resin, or the like is added as a plasticizer.

  The method (5) is a method of expressing flexibility with an interpenetrating network (IPN) structure in which a resin having another soft structure is introduced into the crosslinked structure of the epoxy resin.

  The method (6) is a method in which liquid or granular rubber particles are compounded and dispersed in an epoxy resin matrix. Polyester ether or the like is used as the epoxy resin matrix.

  The method (7) is a method for expressing flexibility by introducing microvoids of 1 μm or less into the epoxy resin matrix. A polyether having a molecular weight of 1000 to 5000 is added as an epoxy resin matrix.

  By adjusting the rigidity and flexibility of the epoxy resin, it can be wound around the outer periphery of the synthetic resin tube.

  Any of the above resins may be used alone, or a blend of two or more resins may be used to adjust the melt viscosity, flexibility, and tackiness of the resin. Furthermore, it may be cross-linked or modified as long as it does not impair the fire resistance and sound insulation of the fire-resistant multilayer tube of the present invention, and is simultaneously cross-linked and modified simultaneously with various fillers and additives used in the present invention. Alternatively, it may be cross-linked or modified after blending the above components with the resin. In this case, the crosslinking method is not particularly limited, and a normal resin crosslinking method, for example, a crosslinking method using various crosslinking agents or peroxides, a crosslinking method by electron beam irradiation, or the like can be used.

  The resin composition containing the thermally expandable inorganic substance and inorganic filler used in the present invention contains the above-mentioned resin and a thermally expandable inorganic substance and an inorganic filler having a true specific gravity of 3.0 or more. In the refractory multilayer pipe of the present invention, the thermally expandable inorganic substance forms an expanded heat insulating layer during heating to prevent heat transfer. In addition, the inorganic filler contributes to an increase in the specific gravity of the resin composition and imparts sound insulation and vibration damping properties.

  Examples of the heat-expandable inorganic material are heat-expandable inorganic materials that expand upon heating, and examples thereof include vermiculite, kaolin, mica, and heat-expandable graphite. Among these, heat-expandable graphite is preferable because the foaming start temperature is low.

Thermally expandable graphite is a conventionally known substance, and powders such as natural scaly graphite, pyrolytic graphite, and quiche graphite are mixed with inorganic acids such as concentrated sulfuric acid, nitric acid, and selenic acid, concentrated nitric acid, perchloric acid, and perchlorine. This is a crystalline compound in which a graphite intercalation compound is produced by treatment with a strong oxidizing agent such as acid salt, permanganate, dichromate, hydrogen peroxide, etc., and maintains a layered structure of carbon.

  The heat-expandable graphite obtained by acid treatment as described above is preferably further neutralized with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound, or the like.

  Examples of the aliphatic lower amine include monomethylamine, dimethylamine, trimethylamine, ethylamine, propylamine, and butylamine. Examples of the alkali metal compound and alkaline earth metal compound include hydroxides such as potassium, sodium, calcium, barium, and magnesium, oxides, carbonates, sulfates, and organic acid salts.

  The particle size of the thermally expandable graphite is preferably 20 to 200 mesh. When the particle size is smaller than 200 mesh, the degree of expansion of graphite is small, and a sufficient fireproof heat insulating layer cannot be obtained. When the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large. Or when kneading with an epoxy resin, dispersibility worsens and a fall of a physical property cannot be avoided.

As a commercial item of the said thermal expansion graphite by which the neutralization process was carried out, for example, UCAR CARBON
“GRAFGUARD” manufactured by the company, “GREP-EG” manufactured by Tosoh Corporation, and the like.

  The inorganic filler having a true specific gravity of 3.0 or more is not particularly limited as long as the true specific gravity is 3.0 or more. For example, barium sulfate (specific gravity 4.4, the same shall apply hereinafter), barium carbonate (4. 3), inorganic salts such as barium titanate (5.5), mica (3.0), titanium oxide (4.2), zinc oxide (5.4), iron oxide (5.2), zirconium oxide ( 5.5), metal oxides such as antimony oxide (5.7), aluminum oxide (3.8), magnesium oxide (3.3), iron (7.9), zinc (7.1), lead ( Metal powders such as 11.3). These may be used alone or in combination of two or more.

  In addition, the resin composition containing the thermally expandable inorganic material and the inorganic filler used in the present invention has a range that does not impair the physical properties thereof, and further includes phenolic, amine-based, sulfur-based antioxidants, metal damage, and the like. An inhibitor, an antistatic agent, a stabilizer, a crosslinking agent, a lubricant, a softener, a pigment, and the like may be added. Also, by adding a general flame retardant typified by phosphorus flame retardants such as ammonium polyphosphate, red phosphorus, phosphate ester, metal phosphate, and inorganic flame retardants such as aluminum hydroxide, Fire resistance can be improved by suppression.

  In the resin composition containing the thermally expandable inorganic material and inorganic filler used in the present invention, the amount of the thermally expandable inorganic material in the resin composition is preferably 20 to 400 parts by weight with respect to 100 parts by weight of the resin. . If the amount of the heat-expandable inorganic material exceeds 400 parts by weight, uniform dispersion becomes difficult, so that it is difficult to form a uniform thickness, and if it is less than 20 parts by weight, the sheet thickness is sufficient to obtain sufficient fire resistance. Need to be increased, in which case the handleability of the sheet material becomes poor. Moreover, the blending amount of the inorganic filler having a true specific gravity of 3.0 or more is preferably 50 to 500 parts by weight with respect to 100 parts by weight of the resin. If the blending amount of the inorganic filler exceeds 500 parts by weight, the fluidity when molding the resin composition is poor and it becomes difficult to form a sheet or the like, and if it is less than 50 parts by weight, sound insulation and vibration control properties are exhibited. A sufficient specific gravity cannot be secured.

The resin composition containing the thermally expandable inorganic substance and inorganic filler used in the present invention is obtained by kneading the above components using a known kneading apparatus such as a Banbury mixer, a kneader mixer, or a two-roller. Can do. Furthermore, the resin composition in the form of a sheet can be obtained by a conventionally known molding method such as hot press molding, extrusion molding, or calendar molding. By using the sheet-like resin composition, the layer 2 made of a thermally expandable refractory material having soundproofing properties in FIG. 1 can be formed.

  The resin composition containing the thermally expandable inorganic substance and inorganic filler used in the present invention usually has a specific gravity of 1.5 or more. If the specific gravity is less than 1.5, a sufficient soundproofing effect cannot be obtained.

  Further, the resin composition containing the thermally expandable inorganic material and the inorganic filler used in the present invention usually has a tensile elastic modulus of 0.3 to 50 MPa using a JIS K 6301 No. 2 dumbbell. If the tensile modulus is less than 0.3 MPa, handling and construction are difficult, and if it exceeds 50 MPa, the sound insulation performance is reduced. Further, the resin composition used in the present invention preferably has a Tanδ value of 1 or more when measured for dynamic viscoelasticity at room temperature, since the sound insulation and damping performance is further improved.

  When the resin composition containing the thermally expandable inorganic material and the inorganic filler has the above-described specific gravity and elastic modulus, it is possible to reduce the transmitted sound on the general surface. This is because sound propagation occurs when the material transmits vibration, and vibration is reduced when the specific gravity of the material increases. Moreover, it is because there exists an effect which reduces a vibration, when the elasticity modulus of material is high.

Further, in the sheet shape of the resin composition containing the thermally expandable inorganic material and inorganic filler used in the present invention, the thickness change when irradiated with a heat amount of 50 kW / m ² for 30 minutes (thickness D1 / irradiation after irradiation) The previous thickness D0) is usually in the range of 1.1 to 100 times. If the thickness change is less than 1.1 times, the fire resistance performance is insufficient, and if it exceeds 100 times, the strength of the fireproof heat insulating layer formed by expansion due to heating is lowered and tends to collapse.

Next, different embodiments of the present invention will be described.
FIG. 2 is a main cross-sectional perspective view of a refractory multilayer tube illustrating one embodiment of the present invention. In FIG. 2, 1 is a synthetic resin tube, 3 is a layer made of a soundproof material, and 4 is a layer made of a thermally expandable material. In FIG. 2, a layer 3 made of the soundproof material is provided on the outer periphery of the synthetic resin tube 1, and the thermally expandable material 4 is provided on the outer periphery thereof. Although not specifically shown here, the positions of the layer 3 made of the soundproofing material and the layer 4 made of the heat-expandable material may be different from each other.

  Examples of the soundproofing material include a resin composition containing an inorganic filler having a true specific gravity of 3.0 or more.

As the soundproof material, the resin composition that does not include the above-described thermally expandable inorganic material is used.
Moreover, you may use resin foams, such as a phenol foam, a urethane foam, a polystyrene foam, a polypropylene foam, a polystyrene foam.

The inorganic filler having a true specific gravity of 3.0 or more used for the soundproof material is the same as the inorganic filler in the resin composition containing the thermally expandable inorganic substance and the inorganic filler described above.
The inorganic filler can be in a granular shape or a crushed shape as well as in a fibrous shape.

The resin composition containing an inorganic filler having a true specific gravity of 3.0 or more used in the present invention is obtained by kneading the above components using a known kneading apparatus such as a Banbury mixer, a kneader mixer, or a two-roll. Obtainable. Furthermore, the resin composition in the form of a sheet can be obtained by a conventionally known molding method such as hot press molding, extrusion molding, or calendar molding.
Using the sheet-like resin composition, the layer 3 made of the soundproofing material in FIG. 2 can be formed.

Moreover, as a material about the said thermally expansible material 4 in FIG. 2, true specific gravity 3 is mentioned from the resin composition containing the thermally expansible inorganic substance demonstrated previously and the inorganic filler of true specific gravity 3.0 or more, for example. Except for inorganic fillers of 0.0 or more, the following resin compositions containing inorganic fillers can be exemplified.
Examples of the inorganic filler include silica, diatomaceous earth, alumina, calcium oxide, magnesium oxide, ferrites, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, Dorsonite, hydrotalcite, calcium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balun, aluminum nitride, nitriding Boron, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide Emissions, silicon carbide, stainless steel fiber, zinc borate, various magnetic powder, slag fibers, fly ash, inorganic phosphorus compounds, and the like. These may be used alone or in combination of two or more.
This resin composition can be obtained according to the same procedure as that for producing a resin composition containing the above-described thermally expandable inorganic material and an inorganic filler having a true specific gravity of 3.0 or more.

Next, an embodiment relating to the method for producing a fireproof multilayer pipe of the present invention will be described with reference to FIG.
FIG. 3 is a schematic explanatory view showing an example of a production apparatus used in the production method of the fireproof multilayer tube of the present invention. In FIG. 3, 5 is an extruder for extruding synthetic resin. A die 6 formed by extruding the synthetic resin into a hollow tube is attached to the tip of the extruder 5.

  A winding device 20 that rotates around the synthetic resin tube 1 serving as a core material extruded from the mold 6 and winds the sheet-like thermally expandable refractory material 2 is opposite to the extruder 5. It is provided at the tip of the side molding die 6. The winding device 20 includes a roll 30 that applies an adhesive to the inner surface of a thermally expandable refractory material 2 having a sheet-like soundproofing property. In addition, this roll 30 can be abbreviate | omitted when the thermally expansible fireproof material 2 which has a sheet-like soundproof property has adhesiveness.

In front of the winding device 20, a cooling device 7 such as a water tank and a take-up machine 8 are sequentially provided.
As the extruder 5, various types of extruders such as an extruder used for molding a general synthetic resin can be used.

Next, a method for producing the fireproof multilayer tube of the present invention using the above apparatus will be described.
First, the synthetic resin extruded from the extruder 5 has the shape of the synthetic resin pipe 1 that becomes a core material by passing through the mold 6.
Next, the heat-expandable refractory material 2 having a uniform width and thickness, which is coated with an adhesive by the roll 30, is wound so that no gap is generated on the outer surface of the synthetic resin tube 1. At the same time, the synthetic resin tube 1 and a layer made of a thermally expandable fireproof material having soundproofing properties are integrated.

  The winding device 20 is rotated around the synthetic resin tube 1 by a power device (not shown), whereby the sheet-like thermally expandable refractory material 2 having a soundproof property is fed out from the material roll 40, An adhesive is applied when passing through the roll 30 and is wound around the outer surface of the synthetic resin tube 1.

  Subsequently, as described above, the fireproof multi-layer pipe in which the layer made of the heat-expandable fireproof material 2 having the soundproofing property is formed on the outer surface of the synthetic resin pipe 1 is supplied to the cooling device 7 and cooled. Is taken up by the take-up machine 8. In this way, the fireproof multilayer tube of the present invention is obtained.

Next, another embodiment relating to the method for producing a fireproof multilayer pipe of the present invention will be described with reference to FIG.
FIG. 4 is a schematic explanatory view showing an example of a production apparatus used in the production method of the fireproof multilayer tube of the present invention. In FIG. 4, 5 is an extruder for extruding synthetic resin. A die 6 formed by extruding the synthetic resin into a hollow tube is attached to the tip of the extruder 5.
A winding device 21 for rotating the periphery of the synthetic resin tube 1 serving as a core material extruded from the mold 6 to wind the sheet-like soundproofing material 3 and a sheet-like thermally expandable material 4 are wound. Two winding devices 22 that rotate are provided in succession on the tip of the molding die 6 on the opposite side of the extruder 5. The winding devices 21 and 22 respectively include rolls 41 and 42 for applying an adhesive to the inner surfaces of the sheet-like soundproofing material 3 and the sheet-like thermally expandable material 4. In addition, when the sheet-like soundproof material 3 has adhesiveness, the roll 41 can be omitted. The same applies to the case where the sheet-like thermally expandable material 4 has adhesiveness.

In front of each winding device 21 and 22, a cooling device 7 such as a water tank and a take-up machine 8 are sequentially provided.
As the extruder 5, various types of extruders such as an extruder used for molding a general synthetic resin can be used.
The method for producing the refractory multilayer pipe of the present invention using the above apparatus is the same as that in the case of FIG. 3 described above.

Next, another embodiment relating to the method for producing a fireproof multilayer pipe of the present invention will be described with reference to FIG.
FIG. 5 shows an example of the apparatus used in the method for producing a fireproof multilayer tube of the present invention as seen from above. In FIG. 5, 9 is a double-layer tubular body molding die, and 10a is an extruder for sending out a thermally expandable refractory material having soundproofing properties connected to the flow path of this die. 10b is a synthetic resin extruder. The synthetic resin hopper 51 is connected to the rear end of the cylinder 11b of the synthetic resin 10b by the quantitative feeder 61, and the heat-expandable refractory material hopper 50 having the same soundproofing property is extruded by the quantitative feeder 60. The cylinder 10a is connected to the rear end of the cylinder 11a. In this way, the heat-expandable heat-expandable refractory material can be supplied to the extruder 10a without being affected by the cylinder-heat of the extruder 11b. 12 is a cooling water tank. Reference numeral 13 denotes a wall thickness measuring machine, for example, an X-ray type, an ultrasonic reflection type, or the like can be used. 14 is a take-up machine, 15 is a regular cutting machine, and 16 is a product discharger.

  In order to manufacture the fireproof multi-layer tube of the present invention using the above apparatus, a heat-expandable heat-expandable fireproof material is put into the hopper 50, a synthetic resin is put into the hopper 51, and these are fed to each feeder 60. , 61 are respectively supplied to the extruders 10a and 10b, further kneaded and melted, and each is simultaneously extruded from the two-layer molding die 9, and the refractory multilayer tube coming out of the die 9 is cooled in the cooling water tank 12 and drawn. The fire-resistant multi-layer tube of the present invention is obtained by taking up with the take-off machine 14, cutting with a cutting machine 15 at a regular length, and discharging the fixed-length tube with a discharger 16.

Next, another embodiment relating to the method for producing a fireproof multilayer pipe of the present invention will be described with reference to FIG.
FIG. 6 shows an example of the apparatus used in the method for manufacturing a fireproof multilayer tube according to the present invention as seen from above. In FIG. 6, reference numeral 9 denotes a three-layer tubular body molding die, and 10a denotes an extruder that sends out a thermally expandable material and a soundproofing material connected to two outer flow paths of the die. 10b is a synthetic resin extruder. The synthetic resin hopper 51 is connected to the rear end of the cylinder 11b of the extruder 10b by the quantitative feeder 61. Similarly, the sound proof material hopper 50 is connected to the rear end of the cylinder 11a of the extruder 10a by the quantitative feeder 60. It is linked to. The thermally expandable material hopper 53 is connected to the rear end of the cylinder 11a by a feeder 62 perpendicular to the cylinder 11a, and the thermally expandable material is affected by the cylinder heat of the extruder 11b. Without being supplied to the extruder 10a. The meanings of 12 to 16 in FIG. 6 are the same as those in FIG.

  In order to manufacture the fireproof multilayer tube of the present invention using the above apparatus, the thermally expandable material is put into the hopper 53 for the thermally expandable material, the soundproof material is put into the hopper 50, and these are fed to each feeder. 62, 60 is supplied to the extruder 10a, and further kneaded and melted, and the synthetic resin is charged into the hopper 51, which is supplied to the synthetic resin extruder 10b by the feeder 61, and further kneaded and melted. Each of them is co-extruded from the three-layer molding die 9, the refractory multilayer tube from the die 9 is cooled in the cooling water tank 12, taken up by the take-up machine 14, cut by the cutting machine 15 and cut out by the cutting machine 15, and the discharge machine 16 In the meantime, the thickness of the intermediate layer or the entire thickness of the tubular body is measured with the thickness measuring machine 13, and when the measured thickness value is larger than the reference value, Thermally expansible material supply feeder 62 is decelerated and the amount of thermally expansible material is supplied When the measured thickness value is smaller than the reference value, it is corrected to the reference thickness by increasing the heat-expandable material supply feeder 62 and increasing the heat-expandable material supply amount. Thus, the thickness of the intermediate layer, and hence the thickness of the three-layer tube, is made uniform. The same applies to the adjustment of the reference thickness in the case of FIG. In this way, the fireproof multilayer tube of the present invention is obtained.

Hereinafter, the embodiments of the present invention will be described in more detail by way of examples. However, the present invention is not limited to these examples.
[Test method]
The test method carried out in this example is as follows.

(1) Fire resistance test After the fire-resistant multilayer tube was inserted through the floor circular penetration part opened in the slab having a thickness of 150 mm, the gap between the fire-resistant multilayer tube and the slab 3 was filled with mortar 4 and fixed. .
The fireproof multi-layer pipe fixed to the slab was subjected to a floor two-hour fireproof test based on ISO834, and the presence or absence of a flame penetration to the non-heated surface side was observed.

(2) Soundproof test As shown in FIGS. 7 and 8, the fireproof multilayer pipe is installed as a drain pipe so as not to be connected acoustically inside and outside the reverberation room, and the upper part of the fireproof multilayer pipe is provided on the ceiling slab. The bottom end was connected to a drainage tank. Next, water was allowed to flow from the water tank to the refractory multilayer tube at a flow rate of 52 liters / minute, and radiated sound (solid propagation sound) generated from the refractory multilayer tube was measured in accordance with JIS A1424.
In addition, the measurement points of the radiated sound were set at five places at a height of 1.2 m from the floor surface shown in FIGS.

・ Reference Example 1
Ingredients used in Examples: Butyl rubber (“Butyl # 065” manufactured by ExxonMobil Chemical Co.), isobutylene rubber (“Vistanex MML-80” manufactured by ExxonMobil Chemical Co., Ltd.), polybutene (New Japan) Petrochemical "Polybutene HV-100"), hydrogenated petroleum resin (Idemitsu Petrochemical "Imabe P-125"), ammonium polyphosphate (Clariant "EXOLIT AP422"), neutralized thermal expansion Graphite (“Frame Cut GREP-EG” manufactured by Tosoh Corporation), aluminum hydroxide (“B325” manufactured by Alcoa Kasei Co., Ltd.), calcium carbonate (“BF300” manufactured by Bihoku Powder Chemical Co., Ltd.), barium sulfate (manufactured by Sakai Chemical Co., Ltd. Materials selected from barium sulfate (BD) ”) and titanium oxide (manufactured by Sakai Chemical Co., Ltd.) were used as the following various raw materials.

As shown in FIG. 4, a rigid polyvinyl chloride tube was produced by extruding polyvinyl chloride having a degree of polymerization of 800 and an average particle size of 100 μm, and the outer periphery of the polyvinyl chloride tube was obtained by the formulation shown in Table 1. The soundproof resin composition and the tape-shaped molded body of the heat-expandable material were wound while being extruded to obtain a fireproof multilayer tube.
In the fire resistance test using the fireproof multilayer tube, no penetration of the flame was observed.
As a result of the soundproofing test, the noise level was 40 dB or less.

As shown in FIG. 5, polyvinyl chloride having a degree of polymerization of 800 and an average particle size of 100 μm, and a heat-expandable refractory material having soundproofing properties obtained by blending shown in Table 1 on the outer periphery of the polyvinyl chloride tube A fireproof multilayer tube was obtained while co-extrusion.
In the fire resistance test using the fireproof multilayer tube, no penetration of the flame was observed.
As a result of the soundproofing test, the noise level was 40 dB or less.

It is principal part sectional drawing of the fireproof multilayer tube provided with the layer which consists of a thermally expansible fireproof material which has sound insulation. It is principal part sectional drawing of a fireproof multilayer tube provided with the layer which consists of a soundproof material, and the layer which consists of a thermally expansible material. It is the schematic of the winding apparatus for manufacturing the fireproof multilayer tube of this invention. It is the schematic of the winding apparatus for manufacturing the fireproof multilayer tube of this invention. It is the schematic of the coextrusion apparatus for manufacturing the fireproof multilayer tube of this invention. It is the schematic of the coextrusion apparatus for manufacturing the fireproof multilayer tube of this invention. It is principal part plane sectional drawing of the reverberation room used for the soundproofing test of this invention. It is principal part front sectional drawing of the reverberation room used for the soundproofing test of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Synthetic resin pipe | tube 2 The layer which consists of thermally expansible refractory material which has sound insulation 3 The layer which consists of soundproof material 4 The layer which consists of thermally expansible material 5 Extruder 6, 9 Mold 7 Cooling device 8, 14 Take-up machine 10a, DESCRIPTION OF SYMBOLS 10b Extruder 11a, 11b Cylinder 12 Cooling water tank 13 Thickness measuring machine 15 Cutting machine 16 Ejector 17 Drain hole 18 Measuring point 19 Water tank 20, 21, 22 Winding device 30, 31, 32 Roll for adhesive application 40, 41 , 42 Roll 50, 51, 52 Hopper 60, 61, 62 Feeder 70 Reverberation chamber 71 Drain tank 72 Water distribution pipe 73 Slab 80, 81 Anti-vibration rubber

Claims (5)

A synthetic resin tube,
A layer made of a thermally expandable refractory material having soundproofing provided on the outer periphery of the synthetic resin tube;
Fireproof multi-layer tube made of.   The method for manufacturing a fire-resistant multilayer tube according to claim 1, wherein the heat-expandable heat-expandable fire-resistant material is spirally wound around the synthetic resin tube.   The method for producing a fire-resistant multilayer tube according to claim 1, wherein the synthetic resin and the heat-expandable heat-expandable fire-resistant material are coextruded to form a multilayer tube shape.   2. The fireproof multilayer tube according to claim 1, wherein the layer made of a heat-expandable fire-resistant material having soundproofing properties is composed of a layer made of a soundproof material and a layer made of a heat-expandable material. . The method for manufacturing a fireproof multilayer tube according to any one of claims 2 and 3, wherein two materials, a soundproof material and a heat expandable material, are used as the heat-expandable heat-expandable fireproof material.

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