JP2011140768A - Thermally-expansive fireproof annular molding for piping, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermally-expansive fireproof annular molding for piping, and a method for manufacturing the thermally-expansive fireproof annular molding for piping, which are easily aligned and excelling in shape holding property without being easily broken when inserting through piping inside. <P>SOLUTION: [1] The thermally-expansive fireproof annular molding for piping contains 10-100 pts.wt. of resin component, 0.5-8 pts.wt. of reinforcing agent, and 5-40 pts.wt. of thermally expansive inorganic substance to 100 pts.wt. of inorganic fiber. [2] The method for manufacturing the thermally-expansive fireproof annular molding for piping includes at least processes for suspending a resin composition in a dispersion medium to obtain a suspension, filtering the suspension through a filter having a suction part of annular recessed shape to separate a filtrate accumulated in the suction part of annular recessed shape of the filter, from the dispersion medium, and drying the filtrate accumulated in the annular recess of the filter. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a thermally expandable refractory annular molded body installed on the outer periphery of a pipe and a method for manufacturing the same.

In addition to requests for legal building standards to prepare for disasters such as fires, various measures have been taken on buildings, etc., in order to minimize the effects of fires when they actually occur.
For example, when a fire occurs inside a building such as a building, a fire prevention section partitioned by a fire wall or the like is provided inside the building so that the fire does not spread throughout the building. In this way, when a fire occurs in one fire prevention compartment, the fire is prevented from spreading to other fire prevention compartments.
However, in fact, even in the case of a building such as a building having such a fire prevention section, there are many cases where pipes penetrating each fire prevention section are provided, and fire and smoke are transmitted through these pipes. There is a problem such as spreading.

In order to cope with such a problem, it is effective to install a thermally expandable refractory annular molded body in the pipe.
When a fire or the like actually occurs, the heat-expandable refractory annular molded body installed in the pipe expands due to the heat of the fire or the like, thereby closing the inside of the pipe, resulting in a fire or It becomes possible to prevent the smoke from spreading.
As a heat-expandable refractory annular molded body used for such applications, a resin composition composed of low-density polyethylene and thermally expandable graphite is extruded into a tube shape using a tube die, and the tube-shaped molded body is cut after cooling. A thermally expandable refractory annular molded body obtained in this manner has been proposed (Patent Document 1).
However, since polyolefin plastics such as low-density polyethylene melt even at relatively low temperatures, when the thermally expandable annular molded body is exposed to heat such as fire, the polyolefin plastic melts before the thermally expandable graphite expands. In the case where the temperature is within the temperature range, the performance of the thermally expandable annular molded body may not be sufficiently utilized for reasons such as peeling off from the installation location.

On the other hand, a heat-expandable inorganic fiber felt containing inorganic fibers such as ceramic wool and thermally expandable inorganic powder has been proposed (Patent Document 2).
In the case of the heat-expandable inorganic fiber felt, since inorganic fibers such as ceramic wool have a sufficiently high softening temperature as compared with polyolefin plastics, there is no problem of peeling off due to heat such as fire.
However, the heat-expandable inorganic fiber felt has a poor stretchability. For this reason, when the heat-expandable inorganic fiber felt is formed into an annular shape and a pipe is inserted therein, when the outer diameter of the pipe is larger than the inner diameter of the annular heat-expandable inorganic fiber felt, There was a problem that the heat-expandable inorganic fiber felt was easily broken.
Conversely, when the outer diameter of the pipe is smaller than the inner diameter of the annular heat-expandable inorganic fiber felt, the annular heat-expandable inorganic fiber felt moves easily along the pipe, so that alignment for installation is performed. There was also a problem that became difficult.

Further, as a thermally expandable fire-resistant annular molded body having an insertion hole for allowing piping to pass therethrough, a plurality of protrusions extending in the axial direction on the inner peripheral surface of the insertion hole, that is, a thermally expandable fire-resistant annular ring provided with ribs A molded body has been proposed (Patent Document 3).
In the case of the thermally expandable refractory annular molded body provided with this rib, even if there is some variation in the outer diameter of the pipe, the rib is crushed by the outer peripheral surface of the pipe, and the outer peripheral surface of the pipe and the It is assumed that the gap with the inner peripheral surface of the thermally expandable refractory annular molded body provided with the ribs is closed.
However, if the gap is not closed as designed, mortar etc. will leak from the gap that is not closed when a flowable refractory material such as mortar is poured around the piping that penetrates the compartment. In some cases, it was inferior.
Furthermore, the heat-expandable refractory annular molded body provided with ribs has a problem that it is not easy to manufacture because of its complicated structure.

JP 2006-226050 A JP 2000-199194 A Japanese Patent No. 3413061

As a countermeasure against the problem described above, that is, when the outer diameter of the pipe is larger than the inner diameter of the thermally expandable refractory annular molded body, A means for increasing the amount of the resin component contained in the refractory annular molded article can be considered.
However, there is a problem that the shape retention of the heat-expandable fire-resistant annular molded article obtained by increasing the resin component contained in the heat-expandable fire-resistant annular molded article is lowered.
In order to improve the shape retention, it is conceivable to add an inorganic compound such as a phosphorus compound. However, when mortar or the like comes into contact with the heat-expandable refractory annular molded body, phosphorus is added by alkaline water contained in the mortar. There was also a problem that the fire resistance of the thermally expandable refractory annular molded body was lowered due to elution of inorganic substances such as compounds.

  An object of the present invention is to provide a thermally expandable fire-resistant annular molded body for piping that does not easily break when piping is inserted inside, and has excellent insertability to the piping, position retention with respect to the piping, and shape retention. There is to do.

  As a result of intensive studies by the present inventors in order to solve the above-mentioned problems, 30 to 120 parts by weight of the resin component, 1 to 15 parts by weight of the reinforcing agent, and 5 to 5 of the thermally expandable graphite with respect to 100 parts by weight of the inorganic fiber. The present inventors have found that a thermally expandable fire-resistant annular molded body for piping contained in the range of 40 parts by weight meets the object of the present invention, and has completed the present invention.

That is, the present invention
[1] 30 to 120 parts by weight of a resin component, 1 to 15 parts by weight of a reinforcing agent, and 5 to 40 parts by weight of a thermally expansive inorganic substance with respect to 100 parts by weight of inorganic fibers, A thermally expandable fire-resistant annular molded body for piping is provided.

The present invention also provides
[2] The thermally expandable fire-resistant annular molded body for piping according to [1], wherein the enhancer is polyacrylamide.

The present invention also provides
[3] A resin composition containing 30 to 120 parts by weight of a resin component, 1 to 15 parts by weight of a reinforcing agent, and 5 to 40 parts by weight of thermally expandable graphite is dispersed with respect to 100 parts by weight of inorganic fibers. Suspending in a medium to obtain a suspension;
Separating the filtrate deposited in the annular concave suction part of the filtration filter from the dispersion medium by filtering the suspension through a filtration filter having an annular concave suction part;
Drying the filtrate deposited inside the annular recess of the filtration filter;
The manufacturing method of the thermally expansible fire-resistant annular molded object for piping characterized by having at least.

The present invention also provides
[4] At least one end of a pipe provided with a cylindrical main body and a non-combustible refractory material layer installed on the outer periphery of the cylindrical main body,
A thermally expandable fire-resistant annular molded body for piping installed in contact with the outer periphery of the tubular body and the side surface of the non-combustible refractory material layer;
Fireproof piping having
The thermally expandable fire-resistant annular molded body for piping is the thermally expandable fire-resistant annular molded body for piping according to the above [1] or [2].

The present invention also provides
[5] A fireproof connection structure for a pipe formed by combining two or more pipes,
A fire-resistant connection structure for piping, wherein the thermally expandable fire-resistant annular molded body for piping according to [1] or [2] is installed between the first piping and the second piping. Is to provide.

The thermally expandable fire-resistant annular molded body for piping according to the present invention has stretchability. Accordingly, when the pipe is inserted into the pipe, the heat-expandable fire-resistant annular molded body for pipe does not easily break, so that the insertability and position retention with respect to the pipe are good, and the workability is excellent.
Moreover, since the thermally expandable fire-resistant annular molded body for piping of the present invention has flexibility and moderate strength, it has excellent shape retention. For this reason, there is no problem such as a change in shape due to the fact that the thermally expandable fire-resistant annular molded body for piping is too flexible, and fusion and the like when storing the thermally expandable fire-resistant annular molded body for piping are excellent in handleability.

  Moreover, the thermally expandable fire-resistant annular molded body for piping can be obtained by a production method including a step of filtering a suspension of a resin composition as a raw material with a filtration filter having an annular concave suction part. Since there is no need to punch the refractory sheet in an annular shape, there is no occurrence of extra heat-expandable refractory sheets that cannot be reused in the manufacturing process. For this reason, since the heat-expandable fire-resistant annular molded body for piping can be efficiently obtained from the suspension as a raw material, the productivity is excellent.

  In addition, by installing the thermally expandable refractory annular molded body for piping of the present invention at the connection portion of the piping, the thermally expandable refractory annular molded body for piping expands due to the heat of a fire, etc. It is possible to prevent the inside of the pipe from entering from the joints, and the fire resistance is excellent.

It is a schematic cross section for demonstrating the filtration filter used for manufacture of the thermally expansible fireproof cyclic molded object for piping of this invention. It is the model top view which illustrated the state which looked down at the filtration filter used for manufacture of the thermally expansible fireproof cyclic molded object for piping from the upper part. It is the model perspective view which illustrated the thermally expansible fireproof cyclic | annular molded object for piping of this invention. It is a model perspective view for demonstrating the fireproof piping which uses the thermally expansible fireproof annular molded object for piping of this invention. It is a schematic cross section for demonstrating the manufacturing method of the fireproof piping which uses the thermally expansible fireproof annular molded object for piping of this invention. It is a schematic cross section for demonstrating the manufacturing method of the fireproof piping which uses the thermally expansible fireproof annular molded object for piping of this invention. It is a schematic cross section for demonstrating the manufacturing method of the fireproof piping which uses the thermally expansible fireproof annular molded object for piping of this invention. It is a schematic cross section for demonstrating the usage form of fireproof piping. It is a schematic cross section for demonstrating the usage form of fireproof piping. It is a schematic cross section for demonstrating the usage form of fireproof piping.

The present invention relates to a heat-expandable fire-resistant annular molded body for piping. First, raw materials used in the present invention will be described.
The thermally expandable refractory annular molded body for piping of the present invention is formed by molding a resin composition containing at least inorganic fibers, a resin component, a reinforcing agent, and a thermally expandable inorganic substance.

Although there is no limitation in particular as said inorganic fiber, For example, a ceramic fiber etc. can be mentioned.
Specific examples of such ceramic fibers include silica alumina fibers, alumina fibers, silica fibers, and zirconia fibers.
Such a ceramic fiber preferably has a melting point of 1300 ° C. or higher, more preferably 1500 ° C. or higher, from the viewpoint of heat resistance.
In the present invention, the melting point means a melting point for a substance that clearly shows the melting point, such as a pure substance, and a substance that does not clearly show the melting point, such as a mixture, in JIS R3103-1. It shall mean the softening point measured accordingly.

The diameter of the inorganic fiber is usually in the range of 0.01 to 100 μm, preferably in the range of 0.1 to 30 μm.
In addition, the inorganic fiber may be a bundle of a plurality of fibers combined with a sizing agent such as a silane coupling agent.

  There is no limitation on the production method for obtaining the inorganic fiber, for example, a rod method for winding the fiber obtained by softening and drawing the inorganic fiber raw material, discharging the molten raw material from the nozzle, Obtained by a method such as a pot method for winding the obtained fiber, a precursor polymer method for winding the fiber obtained by sintering the precursor of the raw material dissolved in an organic solvent as a precursor, and the like. A thing etc. can be obtained as a commercial item.

  The said inorganic fiber can use 1 type, or 2 or more types.

  Examples of the resin component include polyolefin resins such as polypropylene resin, polyethylene resin, poly (1-) butene resin, polypentene resin, polystyrene resin, acrylonitrile-butadiene-styrene resin, methyl methacrylate-butadiene-styrene resin, ethylene-acetic acid. Thermoplastic resins such as vinyl resin, ethylene-propylene resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), methyl methacrylate butadiene rubber (MBR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber ( IR), ethylene-propylene rubber (EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), polyvulcanized rubber (T), silicone rubber (Q), Rubbers such as fluoro rubber (FKM, FZ), urethane rubber (U), etc., thermosetting resins such as polyurethane resin, polyisocyanate resin, polyisocyanurate resin, phenol resin, epoxy resin, the above thermoplastic resins, etc. Examples thereof include emulsions and latexes such as the above rubbers.

  Of these, acrylic polymer emulsions, SBR latexes, MBR latexes and the like are preferable from the viewpoint of handleability.

Acrylic polymer emulsion is a polymer latex composed of alkyl (meth) acrylate, radical polymerizable monomer copolymerizable with alkyl (meth) acrylate, polyfunctional monomer, etc., specifically, A polymer emulsion comprising at least one monomer selected from the alkyl (meth) acrylates,
A copolymer emulsion of at least one monomer selected from the alkyl (meth) acrylate and at least one monomer selected from radical polymerizable monomers copolymerizable with the alkyl (meth) acrylate;
A co- (partially crosslinked) polymer emulsion of at least one monomer selected from each group of the alkyl (meth) acrylate and the polyfunctional monomer;
Copolymer (partially cross-linked) polymer emulsion with alkyl (meth) acrylate, radically polymerizable monomer copolymerizable with alkyl (meth) acrylate, and at least one monomer selected from the group of polyfunctional monomers Is mentioned.

  Examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, n-hexyl (meth) acrylate, cyclohexyl (meth) acrylate, n-heptyl (meth) acrylate, n-octyl (meth) acrylate, 2-methylheptyl (Meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-methyloctyl (meth) acrylate, n-nonyl (meth) acrylate, 2-ethylheptyl (meth) acrylate, n-decyl (meth) acrylate, 2 Alkyl (meth) acrylates such as methylnonyl (meth) acrylate, 2-ethyloctyl (meth) acrylate, lauryl (meth) acrylate, myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, 2-hydroxypropyl Examples thereof include polar group-containing (meth) acrylates such as (meth) acrylate, and at least one of these can be used.

  As the radically polymerizable monomer that can be copolymerized with an alkyl (meth) acrylate, one that can arbitrarily adjust the glass transition temperature of the acrylic copolymer latex is used. For example, 2-acryloyloxyethylphthalic acid, etc. Polar group-containing vinyl monomers, aromatic vinyl monomers such as styrene, α-styrene, p-chlorostyrene and vinyl toluene, unsaturated nitriles such as acrylonitrile and methacrylonitrile, vinyl esters such as vinyl acetate and vinyl propionate, etc. At least one of these can be used.

As a polyfunctional monomer, it acts as a partial cross-linking agent for simple acrylic copolymer latex and graft acrylic copolymer latex, contributing to rubber elasticity of latex particles and agglomerating latex particles in water dispersion. It is hard to happen.
Specifically, for example, as di (meth) acrylate, for example, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) Examples of the tri (meth) acrylate include trimethylolpropane tri (meth) acrylate, ethylene oxide-modified trimethylolpropane tri (meth) acrylate, and pentaerythritol tri (meth) acrylate. ) Acrylate and the like, and at least one of them is used.

  Other polyfunctional monomers include, for example, diallyl such as pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, diallyl phthalate, diallyl malate, diallyl fumarate, diallyl succinate, triallyl isocyanurate. Or divinyl compounds, such as a triallyl compound, divinylbenzene, and a butadiene, are mentioned, At least 1 type of these is used.

Next, the thermally expandable inorganic substance used in the present invention will be described.
The thermally expandable inorganic compound used in the present invention is not particularly limited as long as it expands when heated, and examples thereof include vermiculite, kaolin, mica, and thermally expandable graphite. Among these, heat-expandable graphite is preferable because the foaming start temperature is low.

  The heat-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, peroxygen, and the like. A graphite intercalation compound produced by treatment with a strong oxidant such as chlorate, permanganate, dichromate, hydrogen peroxide, etc., and is a crystalline compound that maintains the 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 thermal expandable graphite preferably has a particle size in the range of 20 to 200 mesh. If the particle size is smaller than 200 mesh, the degree of expansion of graphite is small and a sufficient fire-resistant heat insulating layer cannot be obtained. On the other hand, if the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large. It becomes difficult to be retained in the inorganic material.

  Examples of the neutralized heat-expandable graphite commercial product include “GRAFGUARD” manufactured by UCAR CARBON, “GREP-EG” manufactured by Tosoh Corporation, and the like.

  The said thermally expansible inorganic substance can use 1 type, or 2 or more types.

Next, the enhancer used in the present invention will be described.
The enhancer used in the present invention imparts shape retainability while maintaining the flexibility of the thermally expandable fire-resistant annular molded body for piping of the present invention, and examples thereof include water-soluble polymer compounds.

  Examples of the water-soluble polymer compound include polysaccharides, polyethylene glycol, polypropylene glycol, polyvinyl alcohol, polyvinyl ether, polyacrylic acid, polyacrylate, polyacrylamide, and polyvinylpyrrolidone.

  Among these, polyacrylamide is preferable because it maintains flexibility and retains shape.

  Next, the quantitative relationship between the inorganic fiber, the resin component, the enhancer, and the thermally expandable inorganic substance contained in the resin composition used in the thermally expandable fire-resistant annular molded body for piping according to the present invention will be described.

The thermally expandable fire-resistant annular molded body for piping according to the present invention has 10 to 100 parts by weight of a resin component, 0.5 to 8 parts by weight of a reinforcing agent, and 5 to 5 parts of a thermally expandable inorganic material with respect to 100 parts by weight of inorganic fibers. It is included in the range of 40 parts by weight.
When the range of the resin component is less than 10 parts by weight with respect to 100 parts by weight of the inorganic fibers, the resulting thermally expandable fire-resistant annular molded article for piping is poor in flexibility and easily breaks. On the other hand, when it exceeds 100 parts by weight, the shape retaining property is lowered.
The range of the resin component is more preferably 15 to 80 parts by weight, and even more preferably 20 to 60 parts by weight.

Moreover, when the range of the said reinforcing agent is less than 0.5 weight part with respect to 100 weight part of inorganic fiber, the intensity | strength of the heat-expandable fire-resistant annular molded object for piping obtained falls. On the other hand, when the amount exceeds 8 parts by weight, the elongation decreases.
The range of the enhancer is preferably 0.75 to 6 parts by weight, and more preferably 1 to 4 parts by weight.

Moreover, when the range of the said thermally expansible inorganic substance is less than 5 weight part with respect to 100 weight part of inorganic fibers, the expansion rate of the thermally expansible fire-resistant annular molded object for piping when exposed to heat, such as a fire, is not enough. Absent. Moreover, when it exceeds 40 weight part, a softness | flexibility will fall.
The range of the thermally expandable inorganic substance is preferably 5 to 30 parts by weight, more preferably 8 to 25 parts by weight.

Next, the manufacturing method of the thermally expansible fire-resistant annular molded object for piping of this invention is demonstrated.
As a method for producing the thermally expandable fire-resistant annular molded body for piping, for example, a suspension obtained by suspending the resin composition in an organic solvent is poured into a mold, and the organic solvent is evaporated and molded. Examples thereof include a forming method, a hot pressing method in which the resin composition is molded by a heated mold press, and a paper making method using a suspension in which the resin composition is suspended in a dispersion medium.
The method for producing the thermally expandable fire-resistant annular molded body for piping is preferably a papermaking method.

  Specifically, as the paper making method, a suspension obtained by mixing an emulsified resin component with inorganic fibers, a reinforcing agent, a thermally expandable inorganic substance, etc. in a dispersion medium is filtered and filtered from the dispersion medium. Examples of the method include separating the product and drying the filtrate.

Examples of the dispersion medium used in the papermaking method include hydrophilic organic solvents such as alcohols such as methanol, ethanol and propanol, ketones such as acetone and ethyl methyl ketone, ethers such as tetrahydrofuran and dioxane, water, and the like. Can be mentioned.
The dispersion medium is preferably water.
Moreover, the said dispersion medium can use 1 type, or 2 or more types.

  If necessary, one or more of an emulsifying dispersant, a polymerization initiator, a pH adjuster, a flocculant, and an antioxidant can be used in combination.

  Examples of the emulsifying dispersant include anionic surfactants, nonionic surfactants, partially saponified polyvinyl acetate, cellulose dispersants, and gelatin.

  Examples of the polymerization initiator include water-soluble polymerization initiators such as potassium persulfate, ammonium persulfate, and hydrogen peroxide, organic peroxides such as benzoyl peroxide and lauroyl peroxide, azobisisobutyronitrile, and the like. And azo initiators.

  Examples of the pH adjuster include a sulfate band such as aluminum sulfate.

  Examples of the flocculant include polyvalent metal cations and quaternary ammonium compounds.

Next, the filtration process will be described.
FIG. 1 is a schematic cross-sectional view for explaining a filtration filter used for producing a thermally expandable refractory annular molded body for piping according to the present invention.
FIG. 2 is a schematic plan view illustrating a state in which a filtration filter used for manufacturing a thermally expandable fire-resistant annular molded body for piping is viewed from above.

The filtration step is performed, for example, by introducing a suspension obtained by suspending the resin composition in a dispersion medium into the filtration filter while stirring.
As illustrated in FIG. 1, a filtration filter 1 used in the present invention includes an annular concave suction part 2.
The filtration filter 1 is installed at the bottom of a container containing the suspension (not shown).
In the filtration filter 1, a filter medium 3 is installed on the bottom surface of the annular concave suction part 2, and the lower side of the filter medium 3 is depressurized or the upper side of the filter medium is pressurized to disperse. The filtrate can be separated from the medium. The dispersion medium is recovered from the lower part of the filtration filter 1. Filtrate accumulates on the annular concave suction part 2 of the filter 1.

As the filter medium 3, for example, a wire mesh, a filter cloth, a filter paper, a porous ceramic, a porous glass, or the like can be used.
If filtration ends when the filtrate reaches the upper surface 4 of the filtration filter 1, a filtrate with a certain thickness can be obtained.

  After completion of the filtration, the filtrate is taken out from the filtration filter 1 and the obtained filtrate is dried to obtain the thermally expandable fire-resistant annular molded body for piping of the present invention.

  As the filtration filter shown in FIG. 2, a filtration filter in which the shape of the suction part 2 having an annular concave shape is an annular shape was used, and the shape of the suction part 2 was changed to a polygonal ring such as a triangular ring, a square ring, a hexagonal ring, By obtaining a rectangular ring having a long side and a short side, a parallelogram ring having different inner angles, an elliptical ring, etc., a thermally expandable fire-resistant annular molded body for piping having a desired shape corresponding to these shapes is obtained. Can do.

FIG. 3 is a schematic perspective view illustrating the thermally expandable fire-resistant annular molded body for piping according to the present invention.
The inner diameter, the outer diameter, and the thickness of the thermally expandable fire-resistant annular molded body 6 for piping can be adjusted by changing the shape of the annular concave suction portion of the filtration filter.
The size of the thermally expandable fire-resistant annular molded body 6 for piping is appropriately set according to the outer shape of the piping to be used, the thickness of the incombustible refractory material layer installed on the piping, and the like.

  Usually, the internal diameter of the thermally expandable fire-resistant annular molded body for piping of the present invention is in the range of 10 to 300 mm.

  In addition, the outer diameter of the thermally expandable fire-resistant annular molded body for piping of the present invention is in the range of 40 to 400 mm and is larger than the inner diameter.

  The thickness of the thermally expandable refractory annular molded body for piping of the present invention is in the range of 2 to 6 mm. If this range is thinner than 2 mm, the handleability and shape retention during construction may be lowered, and if it is thicker than 6 mm, it may be economically disadvantageous.

Next, an embodiment of the thermally expandable fire-resistant annular molded body for piping according to the present invention will be described.
FIG. 4 is a schematic perspective view for explaining a fireproof pipe using the thermally expandable fireproof annular molded body for pipe of the present invention.
In FIG. 4, a pipe 9 including a cylindrical main body 7 and a non-combustible refractory material layer 8 installed on the outer periphery of the cylindrical main body 7 is used.

  Examples of the cylindrical main body 7 include, for example, a cross-sectional shape perpendicular to the major axis direction of the cylindrical main body 7 such as a triangle, a polygon such as a quadrangle, a shape such as a rectangle having mutually different lengths, and parallel four sides. Examples of the shape include shapes having different internal angles such as a shape, an ellipse, and a circle. Among these, those having a cross-sectional shape of a circle, a quadrangle, etc. are preferable because of excellent workability.

  The size of the cross-sectional shape of the cylindrical body 7 is usually in the range of 1 to 1000 mm, preferably based on the length of the side having the longest distance from the center of gravity of the cross-sectional shape to the contour line of the cross-sectional shape. Is in the range of 5 to 750 mm.

Moreover, there is no limitation in particular about the raw material of the cylindrical main body 7 used for this invention, For example, what consists of 1 type, or 2 or more types, such as a metal material, an inorganic material, and an organic material, can be mentioned.
Examples of the metal material include iron, steel, stainless steel, copper, and an alloy including two or more metals.
Examples of the inorganic material include glass and ceramic.
Examples of the organic material include synthetic resins such as vinyl chloride resin, ABS resin, vinylidene fluoride resin, polyethylene resin, and polypropylene resin.
The said raw material can use 1 type, or 2 or more types.

  The pipe used in the present invention is one or more of the metal material pipe, the inorganic material pipe, the organic material pipe, etc., but two or more of the metal material pipe, the inorganic material pipe, the organic material pipe, etc. It can also be used as a laminated tube used for a cylinder.

The cylindrical main body 7 illustrated in FIG. 4 is made of vinyl chloride, and mortar is used as the incombustible refractory material layer 8.
Examples of the non-combustible refractory material layer used in the present invention include a building sealing material defined by JIS A5758, a gypsum board joint treatment material defined by JIS A6914, mortar, putty, caulking and the like. it can.

FIGS. 5-7 is a schematic cross section for demonstrating the manufacturing method of fireproof piping which uses the thermally expansible fire-resistant annular molded object for piping of this invention.
On the outer periphery of both ends of the cylindrical main body 7 made of vinyl chloride, a thermally expandable refractory annular molded body 6 for piping is installed.

Next, as illustrated in FIG. 6, the tubular body 7 and the thermally expandable fire-resistant annular molded body 6 for piping are covered with a mold 10. The said metal mold | die 10 is divided | segmented into two, By combining each divided | segmented part, the said cylindrical main body 7 and the thermally expansible fireproof annular molded object 6 for piping can be covered.
A non-combustible refractory material 8 made of mortar is poured into the outer peripheral surface of the cylindrical main body 7, the side surface of the thermally expandable fire-resistant annular molded body 6 for piping, and the gap 11 on the inner surface of the mold 10. After confirming the solidification of the non-combustible refractory material 8, the mold 10 is removed and cured in a temperature range of 50 to 70 ° C. for 6 to 12 hours, whereby the refractory pipe 9 shown in FIG. 7 can be obtained.

Examples of pipes to be used for the thermally expandable fire-resistant annular molded body for pipes of the present invention include liquid transfer pipes such as refrigerant pipes, hot water supply pipes, water pipes, sewage pipes, pouring / draining pipes, fuel transfer pipes, hydraulic pipes, and the like. And gas transfer pipes such as a gas pipe, a heating / cooling medium transfer pipe, and a vent pipe.
Fireproof piping can be obtained by installing a thermally expandable fireproof annular molded body for piping in these piping.

Next, the usage pattern of fireproof piping is demonstrated.
8 to 10 are schematic cross-sectional views for explaining the usage form of the fireproof piping.
The first pipe 20 has a cylindrical main body 27 and a non-combustible refractory material layer 28 installed on the outer periphery of the cylindrical main body 27.
Similarly, the second pipe 30 has a cylindrical main body 37 and a non-combustible refractory material layer 38 installed on the outer periphery of the cylindrical main body 37.

The cylindrical main body 27 protrudes from at least one end of the first pipe 20, and the thermally expandable fire-resistant annular molded body 6 for piping is installed on the outer surface of the protruding portion 29 of the cylindrical main body 27.
In addition, the cylindrical main body 37 protrudes at at least one end of the second pipe 30.
The inner surface shape of the cylindrical main body 27 of the first pipe 20 is substantially the same as the outer surface shape of the protruding portion 39 of the cylindrical main body 37 of the second pipe 30.
For this reason, as illustrated in FIG. 9, by combining the first pipe 20 and the second pipe 30, the cylindrical main body protruding portion 39 of the second pipe 30 is changed to the cylinder of the first pipe 20. It can be installed inside the main body 27 without a gap.
Thereby, the fireproof connection structure by the 1st piping 20 and the 2nd piping 30 can be obtained.

Between the 1st piping 20 and the 2nd piping 30, the thermally expansible fireproof annular molded object 6 for piping is installed. Therefore, when the fireproof connection structure is exposed to heat such as a fire, the thermally expandable fireproof annular molded body 6 for piping expands and the nonflammable refractory material layer 28 of the first pipe 20 and the second pipe 30. The gap with the incombustible refractory material layer 38 is closed.
Thereby, it can prevent that the flame, smoke, etc. which generate | occur | produced by the fire etc. are transmitted through the piping 20 and 30 and spread.

Further, as illustrated in FIG. 10, when the first pipe 20 and the second pipe 30 are combined, the cylindrical main body protruding portion 39 of the second pipe 30 has the cylindrical shape of the first pipe 20. Even when the cylindrical main body protruding portion 39 is exposed outside without being installed in the main body 27 without any gap, the heat for piping is used when the fireproof connection structure shown in FIG. 10 is exposed to heat such as a fire. The expandable refractory annular molded body 6 expands and closes the gap between the incombustible refractory material layer 28 of the first pipe 20 and the incombustible refractory material layer 38 of the second pipe 30.
As a result, even when the cylindrical main body protrusion 39 of the second pipe 30 is not installed in the cylindrical main body 27 of the first pipe 20 without a gap, flames or smoke generated by a fire or the like can be generated by the pipe 20. , 30 can be prevented from spreading.

  EXAMPLES Next, although this invention is demonstrated in detail based on drawing based on an Example, this invention is not limited at all by these Examples.

100 parts by weight of inorganic fiber (trade name SC bulk, manufactured by Nippon Kayaku Thermal Ceramics), 40 parts by weight of acrylic polymer emulsion (trade name LX852, manufactured by Nippon Zeon), 2 parts by weight of enhancer (polyacrylamide, trade name) Polistron 117 (manufactured by Arakawa Chemical Industry Co., Ltd.), 20 parts by weight of thermally expandable graphite (trade name GREP-EG, manufactured by Tosoh Corporation), and 2 parts by weight of pH adjuster (sulfuric acid band) are dispersed in water and emulsified and suspended. A liquid was obtained.
Next, using the filtration filter shown in FIG. 1 and FIG. 2, paper was made from the emulsion suspension to obtain a filtrate. By drying the filtrate, a thermally expandable refractory annular molded body 1 for piping was obtained.

  The test was carried out using the obtained heat-expandable fire-resistant annular molded body 1 for piping. The results are shown in Table 1. Each test condition is as follows.

[Thermal expansion ratio]
Heating was performed at a temperature of 600 ° C. for 30 minutes using an electric furnace.
A test piece having a width of 15 mm, a length of 15 mm, and a thickness of 4 mm was put into an electric furnace heated to 600 ° C., the thickness before and after heating was measured, and the value obtained by dividing the thickness after heating by the thickness before heating was defined as the expansion ratio. did.

[Shape retention test]
Heating was performed at a temperature of 600 ° C. for 30 minutes using an electric furnace.
The state after heating was displayed in the following three stages.
○: Can be lifted by hand ×: Crash when touched by hand XX: Crash when taken out of electric furnace

[Strength test, elongation test]
Instead of the filtration filter having the annular concave suction part of FIG. 1, papermaking was performed in the same manner using a filtration filter having a cylindrical suction part to obtain a filtrate. The filtrate was dried and then cut into a width of 15 mm, a length of 15 mm, and a thickness of 4 mm to obtain a test piece.
The distance between the fixtures of the test piece was set to 50 mm, the sample was pulled at a speed of 30 mm / min, the breaking load and the elongation at break were measured, and indicated as strength and elongation, respectively. The unit of strength is kgf, and the unit of elongation is the percentage of increase.
Table 1 shows ◯ when the strength is 1.5 kgf or more, and × when the strength is less than that.
Table 1 also shows ◯ when the elongation is 10% or more, and × when it is less than that.

  Instead of the acrylic polymer emulsion and thermally expandable graphite used in Example 1, 30 parts by weight of SBR polymer latex (trade name SR107, manufactured by Nippon A & L Co.) and 10 parts by weight of thermally expandable graphite (trade name) Except for using GREP-EG (manufactured by Tosoh Corporation), the same operation as in Example 1 was performed to obtain a thermally expandable refractory annular molded body 2 for piping. The results are shown in Table 1.

  Instead of the acrylic polymer emulsion, the enhancer, and the thermally expandable graphite used in Example 1, 30 parts by weight of SBR polymer latex (trade name SR107, manufactured by Nippon A & L Co., Ltd.), 1 part by weight of the enhancer (poly Except for using acrylamide, trade name Polystron 117, manufactured by Arakawa Chemical Industries, Ltd.), and 10 parts by weight of thermally expandable graphite (trade name GREP-EG, manufactured by Tosoh Corporation), the same operation as in Example 1 was performed. This was performed to obtain a thermally expandable fire-resistant annular molded body 3 for piping. The results are shown in Table 1.

[Comparative Example 1]
Except that the enhancer used in Example 1 was not used, the same operation as in Example 1 was performed to obtain a thermally expandable refractory annular molded body 4 for piping. The results are shown in Table 1.

[Comparative Example 2]
Instead of the acrylic polymer emulsion, the reinforcing agent and the thermally expandable graphite used in Example 1, 120 parts by weight of the acrylic polymer emulsion (trade name LX852, manufactured by Nippon Zeon Co., Ltd.), 3 parts by weight of the reinforcing agent (polyacrylamide) , Trade name Polystron 117, manufactured by Arakawa Chemical Industries, Ltd.), and 30 parts by weight of thermally expandable graphite (trade name GREP-EG, manufactured by Tosoh Corporation) were used. Thus, a thermally expandable refractory annular molded body 5 for piping was obtained. The results are shown in Table 1.

[Comparative Example 3]
Instead of the enhancer and the thermally expandable graphite used in Example 1, 10 parts by weight of the enhancer (polyacrylamide, trade name Polystron 117, manufactured by Arakawa Chemical Industries) and 25 parts by weight of thermally expandable graphite (trade name) Except for using GREP-EG (manufactured by Tosoh Corporation), the same operation as in Example 1 was performed to obtain a thermally expandable refractory annular molded body 6 for piping. The results are shown in Table 1.

[Comparative Example 4]
In place of the acrylic polymer emulsion, the enhancer and the thermally expandable graphite used in Example 1, no enhancer was used, and 30 parts by weight of SBR polymer latex (trade name SR107, manufactured by Nippon A & L Co., Ltd.) Except for using 10 parts by weight of thermally expandable graphite (trade name GREP-EG, manufactured by Tosoh Corporation), the same operation as in Example 1 was performed to obtain a thermally expandable fire-resistant annular molded body 7 for piping. . The results are shown in Table 1.

[Comparative Example 5]
Instead of the acrylic polymer emulsion, the reinforcing agent and the thermally expandable graphite used in Example 1, 30 parts by weight of SBR polymer latex (trade name SR107, manufactured by Nippon A & L Co., Ltd.), 10 parts by weight of the reinforcing agent (poly Except for using acrylamide, trade name Polystron 117, manufactured by Arakawa Chemical Industries, Ltd.), and 10 parts by weight of thermally expandable graphite (trade name GREP-EG, manufactured by Tosoh Corporation), the same operation as in Example 1 was performed. This was performed to obtain a thermally expandable fire-resistant annular molded body 8 for piping. The results are shown in Table 1.

[Comparative Example 6]
Instead of the acrylic polymer emulsion, the enhancer and the thermally expandable graphite used in Example 1, 5 parts by weight of the acrylic polymer emulsion (trade name LX852, manufactured by Nippon Zeon Co., Ltd.), 1 part by weight of the enhancer (polyacrylamide) , Trade name Polystron 117, manufactured by Arakawa Chemical Industries, Ltd.), and 10 parts by weight of thermally expandable graphite (trade name GREP-EG, manufactured by Tosoh Corporation) were used. Thus, a thermally expandable fireproof annular molded body 9 for piping was obtained. The results are shown in Table 1.

DESCRIPTION OF SYMBOLS 1 Filtration filter 2 Annular concave suction part 3 Filter material 4 Upper surface of filtration filter 6 Thermal expansion fireproof annular molded body 7, 27, 37 Tubular body 8, 28, 38 Nonflammable refractory material 9 Piping 10 Mold 11 Air gap 20 First pipe 29, 39 Projection part of cylindrical main body 30 Second pipe

Claims (5)

  A pipe comprising 10 to 100 parts by weight of a resin component, 0.5 to 8 parts by weight of a reinforcing agent, and 5 to 40 parts by weight of a thermally expansive inorganic substance with respect to 100 parts by weight of inorganic fibers. Thermally expandable refractory annular molded product.   The thermally expandable fire-resistant annular molded body for piping according to claim 1, wherein the enhancer is polyacrylamide. A resin composition containing 10 to 100 parts by weight of a resin component, 0.5 to 8 parts by weight of a reinforcing agent, and 5 to 40 parts by weight of a thermally expansive inorganic substance is used as a dispersion medium with respect to 100 parts by weight of inorganic fibers. Suspending to obtain a suspension;
Separating the filtrate deposited in the annular concave suction part of the filtration filter from the dispersion medium by filtering the suspension through a filtration filter having an annular concave suction part;
Drying the filtrate deposited inside the annular recess of the filtration filter;
The manufacturing method of the thermally expansible fire-resistant annular molded object for piping characterized by having at least. At least one end of a pipe provided with a cylindrical main body and a non-combustible refractory material layer installed on the outer periphery of the cylindrical main body,
A thermally expandable fire-resistant annular molded body for piping installed in contact with the outer periphery of the tubular body and the side surface of the non-combustible refractory material layer;
Fireproof piping having
The fire-resistant piping, wherein the thermally expandable fire-resistant annular molded body for piping is the thermally-expandable fire-resistant annular molded body for piping according to claim 1 or 2. It is a fireproof connection structure for piping that is a combination of two or more piping,
A fire-resistant connection structure for piping, wherein the thermally expandable fire-resistant annular molded body for piping according to claim 1 or 2 is installed between the first piping and the second piping.