JPH11140425A - Fire resistant joint material - Google Patents

Abstract

(57) [Problem] To provide a fire-resistant joint material which has excellent airtightness, water-tightness and fire resistance, and is easy to construct. SOLUTION: A foam layer A is formed on the outer periphery of a core material B made of a refractory expansion material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a fire-resistant joint material.

[0002]

2. Description of the Related Art In recent years, members used for inner and outer walls of general buildings have been required to have fire resistance and fire prevention performance. Generally, in order to impart watertightness or airtightness to joints, a sealing material such as a silicone-based (JP-A-60-141778), a modified silicone-based, or a polyurethane-based sealing material is used. However, among these sealing materials, those of wet type that are injected at the construction site,
Some construction problems have been pointed out, such as the necessity of providing a scaffolding throughout the building and a long time to complete the curing.

As a dry method in place of the wet type sealing material, a method using a rod-shaped or sheet-shaped foam and a gasket is used, but most of them, including the sealing material, include fire. As a result, there is a problem in terms of fire prevention.

[0004]

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a fire-resistant joint material which has excellent airtightness, watertightness and fire resistance, and is easy to construct.

[0005]

The refractory joint material of the present invention is characterized in that a foam layer is formed on the outer periphery of a core material made of a refractory expansion material.

[0006] The core material comprising the refractory intumescent material used in the present invention is preferably formed from the following resin compositions (1) to (4). Resin composition (1): thermoplastic resin and / or rubber component,
Contains phosphorus compounds and hydroxyl-containing hydrocarbon compounds. Resin composition (2): thermoplastic resin and / or rubber component,
Contains a phosphorus compound and an inorganic filler. Resin composition (3): thermoplastic resin and / or rubber component,
It contains a phosphorus compound, neutralized heat-expandable graphite, and an inorganic filler.

The thermoplastic resin and / or rubber component is not particularly restricted but includes, for example, polyolefin resins such as polypropylene resins and polyethylene resins, poly (1-) butene resins, polypentene resins,
Polystyrene resin, acrylonitrile-butadiene-
Styrene 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), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPM, EPDM), chlorosulfonated polyethylene ( CSM), acrylic rubber (AC
M, ANM), epichlorohydrin rubber (CO, EC
O), multi-vulcanized rubber (T), silicone rubber (Q), fluorine rubber (FKM, FZ), urethane rubber (U), etc., and these may be used alone or in combination of two or more. May be done. Furthermore, melt viscosity of resin, flexibility,
For adjusting the adhesiveness or the like, a blend of two or more resins may be used as the base resin.

[0008] Halogenated resins such as the above-mentioned chloroprene-based resins and chlorinated butyl-based resins have high flame retardancy by themselves, cross-linking occurs due to dehalogenation reaction by heat, and the strength of the residue after heating is improved. It is preferred in that respect. Those exemplified as the thermoplastic resin and / or rubber component are very flexible and have rubber-like properties, so that the phosphorus compound and the heat-expandable graphite can be highly filled, and the obtained core can be obtained. The material becomes flexible and flexible. In order to obtain a more flexible and flexible core material, non-vulcanized rubber or polyethylene resin is preferably used.

As the polyethylene resin, for example,
Ethylene homopolymer, copolymer containing ethylene as a main component, a mixture thereof, ethylene-vinyl acetate copolymer,
Examples include an ethylene-ethyl acrylate copolymer and an ethylene-methacrylate copolymer. Examples of the copolymer containing ethylene as a main component include, for example, copolymers of ethylene containing ethylene portion as a main component and another α-olefin.
Hexene, 4-methyl-1-pentene, 1-octene,
Examples thereof include 1-butene and 1-pentene.

[0010] The thermoplastic resin and / or rubber component may be cross-linked or modified as long as the fire resistance is not impaired. The timing at which the thermoplastic resin and / or rubber component is crosslinked or modified is not particularly limited, and a previously crosslinked or modified thermoplastic resin and / or rubber component may be used. Cross-linking or modification may be performed simultaneously when compounding other components such as, or cross-linking or modification may be performed after compounding other components with a thermoplastic resin and / or a rubber component. You may.

The method for crosslinking the thermoplastic resin and / or the rubber component is not particularly limited, and a crosslinking method generally used for the thermoplastic resin or the rubber component, for example, a method using various crosslinking agents, peroxides, etc. A method using electron beam irradiation and the like can be given. As for the non-vulcanized rubber, it may be vulcanized after compounding a phosphorus compound, neutralized heat-expandable graphite, an inorganic filler, and other additives.

The above phosphorus compound is not particularly limited.
For example, red phosphorus; various phosphates such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylendiphenyl phosphate; phosphorus such as sodium phosphate, potassium phosphate, and magnesium phosphate Acid metal salts; ammonium polyphosphates; and compounds represented by the following general formula (1). Among these, from the viewpoint of fire resistance, red phosphorus, ammonium polyphosphates, and compounds represented by the following general formula (1) are preferable, and ammonium polyphosphates are more preferable in terms of performance, safety, cost, and the like. preferable.

[0013]

Embedded image

Wherein R ¹ and R ³ are hydrogen, C ¹ -C 1
It represents a 16 linear or branched alkyl group or an aryl group having 6 to 16 carbon atoms. R ² is a hydroxyl group, a linear or branched alkyl group having 1 to 16 carbon atoms, a linear or branched alkoxyl group having 1 to 16 carbon atoms,
Represents an aryl group having 6 to 16 carbon atoms or an aryloxy group having 6 to 16 carbon atoms.

[0015] The flame retardant effect is improved by adding a small amount of the above-mentioned red phosphorus. As the red phosphorus, commercially available red phosphorus can be used, but from the viewpoint of moisture resistance, safety such as not spontaneously igniting during kneading, those obtained by coating the surface of red phosphorus particles with a resin are preferably used. .

The above ammonium polyphosphates are not particularly limited, and include, for example, ammonium polyphosphate and melamine-modified ammonium polyphosphate. Of these, ammonium polyphosphate is preferably used from the viewpoint of handleability and the like. As commercially available products, for example, “AP manufactured by Hoechst”
422 "," AP462 "," Sumisafe P "manufactured by Sumitomo Chemical Co., Ltd.," Terage C60 "manufactured by Chisso Corporation, and the like.

The compound represented by the above general formula (1) is not particularly restricted but includes, for example, methylphosphonic acid, dimethyl methylphosphonate, diethyl methylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methylpropyl Phosphonic acid, t-butylphosphonic acid, 2,3-dimethyl-butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphinic acid, dioctyl Examples include phosphinic acid, phenylphosphinic acid, diethylphenylphosphinic acid, diphenylphosphinic acid, and bis (4-methoxyphenyl) phosphinic acid. Among them, t-butyl phosphonic acid is expensive, but is preferable in terms of high flame retardancy. The above phosphorus compounds may be used alone or in combination of two or more.

The hydroxyl group-containing hydrocarbon compound includes:
There is no particular limitation as long as it is a hydrocarbon compound containing a hydroxyl group in the molecule, but those having 1 to 50 carbon atoms are preferred. However, for a polymer such as starch, it means that the number of carbon atoms in the monomer unit is within this range.

Among such hydroxyl-containing hydrocarbon compounds, polyhydric alcohols having two or more hydroxyl groups in the molecule are particularly preferred. Such polyhydric alcohols include:
For example, ethylene glycol, diethylene glycol,
Propylene glycol, butylene glycol, butanediol 1,4, hexanediol 1,6, monopentaerythritol, dipentaerythritol, tripentaerythritol, neopentaerythritol, sorbitol, inositol, mannitol, glucose, fructose, starch, Cellulose and the like may be mentioned, and these may be used alone or in combination of two or more.

The hydroxyl group-containing hydrocarbon compound includes:
[The number of hydroxyl groups in the molecule / the number of carbons in the molecule] = 0.2 to
2, and more preferably [number of hydroxyl groups in a molecule / number of carbons in a molecule] = 0.0, such as pentaerythritol, sorbitol, mannitol and the like.
7 to 1.5. Above all, pentaerythritols have a high carbonization content and therefore a high carbonization promoting effect,
Most preferred.

If the above [the number of hydroxyl groups in the molecule / the number of carbons in the molecule] is less than 0.2, the decomposition of carbon chains is more likely to occur during combustion than in the case of dehydration condensation. It cannot be formed. When [the number of hydroxyl groups in the molecule / the number of carbons in the molecule] exceeds 2, the formation of a carbonized layer is not hindered, but the water resistance is significantly reduced.
When the water resistance decreases, for example, there are problems such as elution of the hydrocarbon compound when the molded body is cooled with water during molding, and bleed out of the hydrocarbon compound due to humidity during storage of the molded body.

The neutralized heat-expandable graphite is obtained by neutralizing heat-expandable graphite which is a conventionally known substance. The heat-expandable graphite is a natural scale-like graphite, pyrolytic graphite, powder such as quiche graphite,
Produced by treating with inorganic acids such as concentrated sulfuric acid, nitric acid, and selenic acid and strong oxidizing agents such as concentrated nitric acid, perchloric acid, perchlorate, permanganate, dichromate, and hydrogen peroxide. It is a graphite intercalation compound that is a crystalline compound while maintaining a layered structure of carbon.

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

The particle size of the neutralized heat-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, a predetermined refractory insulation layer cannot be obtained, and when the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large,
When kneaded with a thermoplastic resin and / or a rubber component, dispersibility deteriorates, and deterioration of physical properties cannot be avoided.

Commercial products of the above-described neutralized heat-expandable graphite include, for example, "CA-60S" manufactured by Nippon Kasei Co., Ltd. and "GREP-EG" manufactured by Tosoh Corporation.

The inorganic filler is not particularly limited.
For example, metal oxides such as alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, and ferrites; calcium hydroxide, magnesium hydroxide, aluminum hydroxide, hydrotalcite, and the like. Hydrous inorganic substances; Basic carbonates such as magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, barium carbonate; calcium salts such as calcium sulfate, gypsum fiber, calcium silicate; silica, diatomaceous earth, dawn knight, and sulfuric acid barium,
Talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun , Charcoal powder, various metal powders, potassium titanate, magnesium sulfate "MOS" (trade name), lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag Fiber, fly ash, dewatered sludge and the like can be mentioned. Among them, hydrous inorganic substances and metal carbonates are preferred.

Water-containing inorganic substances such as magnesium hydroxide and aluminum hydroxide are endothermic due to water generated by a dehydration reaction during heating, and the temperature rise is reduced to obtain high heat resistance. It is particularly preferable in that the oxide remains as an aggregate, which acts as an aggregate to improve the strength of the residue. Magnesium hydroxide and aluminum hydroxide have different temperature ranges where the dehydration effect is exhibited,
When used together, the temperature range in which the dehydration effect is exhibited is widened, and a more effective temperature rise suppression effect is obtained.

Metal carbonates such as calcium carbonate and zinc carbonate have the property of promoting expansion by reaction with ammonium polyphosphate, and therefore exhibit particularly excellent effects when used in combination with ammonium polyphosphate. In addition, it acts as an effective aggregate and forms a residue having high shape retention after burning.

Generally, the inorganic filler acts as an aggregate, and is considered to contribute to the improvement of residue strength and the increase of heat capacity. Even if the inorganic filler is used alone,
Two or more kinds may be used in combination.

The inorganic filler has a particle size of 0.5 to
100 μm is preferred, more preferably 1 to 50 μm
It is. If the particle size is less than 0.5 μm, secondary agglomeration occurs and dispersibility deteriorates. On the other hand, when the particle size exceeds 100 μm, the surface properties of the molded article and the mechanical properties of the resin composition deteriorate.

When the amount of the inorganic filler to be added is large, it is preferable to select and use one having a large particle diameter in the above range to reduce the viscosity decrease of the resin composition and improve the moldability. Further, it is more preferable to use a combination of a large particle size inorganic filler and a small particle size,
By the combination, higher filling can be achieved.

In the resin composition (1), the total amount of the phosphorus compound and the hydroxyl group-containing hydrocarbon compound is 50 to 900 parts by weight based on 100 parts by weight of the thermoplastic resin and / or rubber component. preferable. If the amount is less than 50 parts by weight, the amount of the residue after heating becomes insufficient, and a refractory heat-insulating layer cannot be formed. If the amount exceeds 900 parts by weight, the mechanical properties of a core material are reduced.

The weight ratio of the phosphorus compound to the hydroxyl group-containing hydrocarbon compound (hydroxyl group-containing hydrocarbon compound / phosphorus compound) is from 0.01 to 20 from the viewpoint of improving the fire resistance and the shape retention of the residue. Is more preferable, and more preferably 0.3 to 10. When the weight ratio is less than 0.01, the foamed heat insulating layer becomes brittle and cannot withstand use,
If it exceeds 20, foam expansion does not occur and sufficient fire resistance cannot be obtained.

In the above resin composition (2), the compounding amount of the phosphorus compound and the inorganic filler is the same as that of the thermoplastic resin and / or the inorganic filler.
Alternatively, the total amount is 50 to 9 with respect to 100 parts by weight of the rubber component.
00 parts by weight is preferred. If the amount is less than 50 parts by weight, the amount of the residue after heating becomes insufficient, and a refractory heat-insulating layer cannot be formed. If the amount exceeds 900 parts by weight, the mechanical properties of a core material are reduced.

The weight ratio of the phosphorus compound to the inorganic filler (hydroxyl-containing hydrocarbon compound / phosphorus compound) is preferably from 0.01 to 50 from the viewpoint of improving the fire resistance and the shape retention of the residue. , More preferably 0.3
~ 15. If the weight ratio is less than 0.01, the foamed heat-insulating layer becomes brittle and cannot withstand use. If it exceeds 50, the phosphorus compound does not function as a binder, and not only becomes difficult to mold, but also the foaming during heating increases. Sufficient fire resistance cannot be obtained due to insufficient expansion.

In the resin composition (3), the compounding amounts of the phosphorus compound, the neutralized heat-expandable graphite, and the inorganic filler are determined according to the amount of the thermoplastic resin and / or the rubber component.
The total amount is preferably 50 to 900 parts by weight based on parts by weight. If the amount is less than 50 parts by weight, the amount of the residue after heating becomes insufficient, and sufficient fire resistance cannot be obtained. If the amount exceeds 900 parts by weight, the mechanical properties are greatly reduced and the product cannot be used.

The weight ratio of the neutralized heat-expandable graphite to the phosphorus compound (neutralized heat-expandable graphite / phosphorus compound) is preferably 0.01 to 9. The weight ratio between the neutralized heat-expandable graphite and the phosphorus compound is 0.01 to
By setting it to 9, it is possible to obtain shape retention of combustion residues and high fire resistance. If the compounding ratio of the neutralized heat-expandable graphite is too large, the expanded graphite will be scattered during combustion, and a sufficient expanded heat-insulating layer cannot be obtained. On the other hand, if the compounding ratio of the phosphorus compound is too large, the formation of the heat insulating layer becomes insufficient, and a sufficient heat insulating effect cannot be obtained.

Even if the weight ratio of the neutralized heat-expandable graphite to the phosphorus compound is in the range of 0.01 to 9, if the compounding ratio of the neutralized heat-expandable graphite is large,
Although a high expansion ratio can be obtained, the shape retention may not be sufficient. In this case, the weight ratio is more preferably 0.01 to 2 from the viewpoint of shape retention during combustion.

The weight ratio of the inorganic filler to the phosphorus compound (inorganic filler / phosphorus compound) is preferably from 0.01 to 50, more preferably from the viewpoint of improving the fire resistance and the shape retention of the residue. 0.3 to 15. If the weight ratio is less than 0.01, the foamed fired layer becomes brittle, and if it exceeds 50, the phosphorus compound does not function as a binder, and not only molding becomes difficult, but also foaming expansion upon heating becomes insufficient, and Fire resistance cannot be obtained.

As the above-mentioned inorganic filler, it is particularly preferable to use a combination of calcium carbonate and a water-containing inorganic substance such as aluminum hydroxide.

The core material made of the above-mentioned fire-resistant expansion material may be used in combination with any two or more of the resin compositions (1) to (3).

The foam used in the present invention is polyethylene, polypropylene, polyurethane, EPDM (ethyl
ne-propylene-diene metylene linkage), EPT (ethy
Known resin foams such as lene-propylene terpolymer) can be used. The resin foam may be either a closed cell or an open cell as long as it can be elastically deformed. The resin foam can be obtained by a known molding method.

As shown in FIG. 1, the fire-resistant joint material of the present invention comprises a core material B made of a fire-resistant expansion material forming a core and a foam layer A provided on the outer periphery thereof. Be composed. The cross-sectional shape of the core material B may be, for example, any shape such as a circle, an ellipse, a square, a rectangle, and a polygon, and may be a hollow or solid shape.

The cross-sectional shape of the refractory joint material may be any shape such as a circle, an ellipse, a square, a rectangle, and a polygon, as long as it does not hinder the joint between the wall materials. Good.

The core preferably has a diameter of 0.2 to 10 mm. If the diameter is less than 0.2 mm, sufficient heat insulating performance will not be exhibited even when thermally expanded, and if it exceeds 10 mm, the weight will be heavy and the handleability will be poor.

In the refractory joint of the present invention, when the core is cylindrical, the thickness of the foam layer is 2 to 10 mm, the thickness of the core is 0.2 to 5 mm, and the outer diameter of the refractory joint is 5 mm. ~ 50m
m is preferable, and the outer diameter is more preferably 10 to 30 mm. If the outer diameter is less than 5 mm, it is difficult to satisfy the water tightness and air tightness required as a joint material,
If it exceeds mm, it may be too thick and may be difficult to attach to a wall material.

When the core material is cylindrical, the thickness of the foam layer is 2 to 20 m for the same reason as in the case of cylindrical shape.
m, outer diameter of core material is 1 to 10 mm, outer diameter of refractory joint material is 5
５０50 mm is preferable, and the outer diameter is more preferably 5-30 m.
m.

The resin composition constituting the above-mentioned core material contains a flame retardant, as long as the fire resistance expansion performance of the resin composition is not impaired.
Various additives such as antioxidants, metal damage inhibitors, antistatic agents, stabilizers, crosslinking agents, lubricants, softeners, pigments and tackifiers may be added.

The above resin composition is, for example, a single screw extruder,
Twin screw extruder, Banbury mixer, kneader mixer,
It is obtained by melt-kneading the components using a known kneading device such as a two-roll mill. The obtained resin composition,
For example, by molding into a sheet by a conventionally known molding method such as press molding, extrusion molding, or calendar molding, a core material made of a fire-resistant expanded material can be obtained.

[0050]

Embodiments of the present invention will be described below.

Example 1 42 parts by weight of butyl rubber, 8 parts by weight of tackifier resin, 50 parts by weight of polybutene, neutralized heat-expandable graphite (“CA-60S” manufactured by Nippon Kasei Co., Ltd.)
100 parts by weight of ammonium polyphosphate ("Sumisafe P" manufactured by Sumitomo Chemical Co., Ltd.) and 100 parts by weight of aluminum hydroxide ("B703S" manufactured by Nippon Light Metal Co., Ltd.) are melt-kneaded using a roll to obtain a resin composition. I got something. The obtained resin composition is extruded into a sheet shape on a polypropylene non-woven fabric (basis weight: 15 g / m ² ) at 90 ° C. with a T-die extruder, and the non-woven fabric substrate is laminated with a 2 mm thick fire-resistant expansion. A sheet made of the material was obtained. Further, on the surface of the sheet opposite to the nonwoven fabric substrate, a 10-mm-thick polyethylene foam [indicated by (1) in the table] blended with aluminum hydroxide (“Taika Softlon” manufactured by Sekisui Chemical Co., Ltd.) , Closed cells) were thermally laminated to obtain a laminate. Next, as shown in FIG. 2, the laminate was pressed so that the contact surface between the foam layer and the nonwoven fabric substrate was heated to 100 ° C. while being bent so that the foam layer side of the laminate was on the outside. 1
A cylindrical refractory joint material 10 ′ having a core material B made of a refractory expandable material and a foam layer A having an outer diameter shown in FIG.

(Example 2) A resin composition having the compounding amount shown in Table 1 was extruded into a sheet shape on a polypropylene non-woven fabric (basis weight: 15 g / m ² ) using a T-die extruder. A sheet made of a refractory intumescent material having a thickness of 2 mm and laminated with the material was obtained. An open-cell EPDM foam was thermally laminated on the surface of the sheet opposite to the nonwoven fabric substrate to obtain a laminate. As in Example 1, the contact surface between the foam layer and the nonwoven fabric substrate was press-bonded while heating to 100 ° C. while bending the laminate so that the foam layer side of the laminate was on the outside.
A cylindrical refractory joint having an outer diameter shown in Table 1 and having a core material made of a refractory expandable material and a foam layer was produced.

Example 3 A resin composition having the compounding amount shown in Table 1 was extruded by a T-die extruder into a sheet on a polypropylene non-woven fabric (basis weight: 15 g / m ² ). Were laminated to obtain a sheet made of a refractory inflatable material having a thickness of 2 mm. An open-celled urethane foam was heat-laminated on the surface of the sheet opposite to the nonwoven fabric substrate to obtain a laminate. As in Example 1, the contact surface between the foam layer and the nonwoven fabric substrate was press-bonded while heating at 100 ° C. while bending the laminate so that the foam layer side was on the outside. A cylindrical refractory joint material having a core material made of a refractory intumescent material and a foam layer having an outside diameter was prepared.

Example 4 A resin composition having the compounding amount shown in Table 1 was extruded by an extruder to obtain a rod made of a refractory expandable material having a diameter of 7 mm. Separately, a polyethylene foam extruded into a hollow cylindrical shape [shown in (2) in the table] (“Softlon ST” manufactured by Sekisui Chemical Co., Ltd., thickness 7 mm,
The outer diameter of 22 mm) was split by a cutter, and the rod was inserted into the polyethylene foam, and the cut portion of the split was heat-sealed, and made of a fire-resistant expanded material having the outer diameter shown in Table 1. A cylindrical refractory joint having a core and a foam layer was prepared.

(Examples 5 and 6) Except that a rod having a diameter of 7 mm, which was obtained by extruding a resin composition having the compounding amount shown in Table 2 by an extruder, was used as a core material made of a refractory expanding material. In the same manner as in Example 4, with the outer diameter shown in Table 2,
A cylindrical refractory joint material having a core material made of a refractory expansion material and a foam layer was prepared.

(Comparative Example 1) A 7 mm thick polyethylene foam (2) ("Softron ST" manufactured by Sekisui Chemical Co., Ltd.) was rolled and used as a fireproof joint material having a cylindrical shape with an outer diameter of 22 mm.

(Comparative Example 2) A rod having a diameter of 7 mm, obtained by extruding a resin composition having the compounding amount shown in Table 2 with an extruder, was used as a fire-resistant joint material.

The performance of the refractory joints obtained in the above Examples and Comparative Examples was evaluated, and the results are shown in Tables 1 and 2. (1) Fire protection test An ALC board ("Hebel Power Board" manufactured by Asahi Kasei Corporation) having a length of 575 mm x a width of 445 mm x a thickness of 37 mm is arranged so that the space between joints is 10 mm, and the fireproof joint is provided on the joint. The material was filled. Next, on the back surface of the joint, the width is 90 m.
m, wood having a thickness of 40 mm was applied and heated from the joint surface side. The back surface temperature (surface temperature of wood) when heated for 30 minutes along a standard heating curve was measured according to JIS A1302 fire prevention class 2 heating test, and the performance was evaluated according to the following criteria. ：: The back surface temperature after 30 minutes is less than 260 ° C. ×: The back surface temperature after 30 minutes is 260 ° C. or more

(2) Water tightness test An acrylic resin plate having a length of 200 mm × a width of 200 mm × a thickness of 15 mm was arranged so that the space between joints was 5 mm, and the joint was filled with a fire-resistant joint material. On the joint material,
A hard PVC resin tube having a diameter of 75 mm and a length of 600 mm is set up, sealed with a sealing material so as not to have a gap with the acrylic resin plate, and then 550 is inserted into the hard PVC resin tube.
Water was injected to a height of mm, and whether or not there was water leakage on the back surface of the joint was visually observed, and the performance was evaluated according to the following criteria. ○: no water leakage after 24 hours ×: water leakage before 24 hours (the time until water leakage was indicated)

[0060]

[Table 1]

[0061]

[Table 2]

Comparative Example 1 is excellent in water tightness but poor in fire resistance, and Comparative Example 2 is poor in water tightness but excellent in fire resistance. When filling the joint with the refractory joint, the joint was deformed and filled as shown in FIG.

[0063]

As described above, the refractory joint material of the present invention has excellent air-tightness, water-tightness and fire resistance by being composed of the core material and the foam layer made of the fire-resistant expansion material. At the same time, since the foam layer is freely deformed, it is possible to easily perform the work on the joint. Therefore, the size of the joint can be freely set to some extent from the viewpoint of design.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a refractory joint material of Examples 1 to 3.

FIG. 2 is a schematic sectional view showing fire-resistant joint materials of Examples 4 to 6.

FIG. 3 is a schematic sectional view showing a filled state of the refractory joint material of the present invention.

[Explanation of symbols]

 Reference Signs List A foam layer B core material made of fire-resistant expanded material 1 non-woven fabric 10, 10 'fire-resistant joint material

Claims (4)

[Claims] 1. A fire-resistant joint material comprising a core material made of a fire-resistant expanded material and a foam layer formed on an outer periphery of the core material. 2. The fire resistant material according to claim 1, wherein the core material made of the fire resistant expanded material is made of a resin composition containing a thermoplastic resin and / or a rubber component, a phosphorus compound, and a hydroxyl group-containing hydrocarbon compound. Jointing material. 3. The core material made of a refractory expandable material is made of a resin composition containing a thermoplastic resin and / or a rubber component, a phosphorus compound, and an inorganic filler.
The described fire resistant joint material. 4. A core material comprising a refractory expandable material comprising a resin composition containing a thermoplastic resin and / or a rubber component, a phosphorus compound, neutralized thermally expandable graphite, and an inorganic filler. The refractory joint material according to claim 1.