JP6758985B2 - Heat expansion gasket - Google Patents

Description

The present invention relates to a heat-expandable gasket that is used for joints formed by abutting wall panels and expands when heated to fill a gap.

In the field of building materials, fire resistance has traditionally been one of the important performances. For example, in roofs and outer walls made of lightweight cellular concrete, the joints between the panels are weak points in fire resistance, and in order to compensate for this, the flames and hot air are released by expanding when heated. A heat expansion gasket may be installed between the panels to prevent it from turning from between the panels to the back surface.
The polyvinyl chloride-based resin has relatively high flame retardancy among the resins and is also excellent in moldability. Utilizing this, if a material to which heat-expandable graphite is added as a material that expands during heating is molded and used as a gasket, in the case of a gasket that is arranged vertically, the upper gasket will melt and run off especially during heating. It was not possible to reliably block the flame and hot air.

As a means for preventing melting, it has been proposed to add a heat-expandable graphite, an inorganic filler and a phosphorus compound to a polyvinyl chloride resin (Patent Document 1).
However, although the polyvinyl chloride resin composition described in Patent Document 1 has good fire resistance, a large amount of additives such as an inorganic filler must be used, and a phosphorus compound such as ammonium polyphosphate is used. Since it adheres to a metal (for example, a mold) during molding, molding is difficult, and there is a problem that productivity is inferior. In addition, there is a concern that the phosphorus compound is depleted of phosphate ore as a raw material, and there is also a problem that it is expensive.

Japanese Unexamined Patent Publication No. 10-59887

The present invention has been devised in view of such conventional circumstances, and has a problem that the gasket melts and runs off during heating even if an expensive phosphorus compound is not used because there is a concern about resource depletion. It is an object of the present invention to provide a heat expansion gasket that can be solved.

As a result of diligent studies to achieve the above object, the present inventors do not melt in the heat-expandable gasket in a direction substantially parallel to the length direction of the gasket below the expansion start temperature of the heat-expandable material. By arranging the threads, it was possible to prevent the molten resin from flowing down during heating, and the present invention was completed. That is, the present invention is as follows.
[1]
A long heat-expandable gasket that contains a synthetic resin and a heat-expandable material and is inserted into a groove.
Threads that do not melt at a temperature equal to or lower than the expansion start temperature of the heat-expandable material are arranged in the gasket substantially parallel to the longitudinal direction.
A heat-expandable gasket characterized in that the expansion start temperature of the heat-expandable material is higher than the softening temperature of the synthetic resin.
[2]
The heat-expanding gasket according to [1], which is produced by extrusion molding.
[3]
The heat-expandable gasket according to [1] or [2], wherein the heat-expandable material is heat-expandable graphite.
[4]
The heat-expandable gasket according to any one of [1] to [3], wherein the yarn is cotton yarn.
[5]
The heat-expandable gasket according to any one of [1] to [4], wherein the yarn is a twisted yarn.
[6]
The heating according to any one of [1] to [5], comprising a long plate-shaped body portion and a projecting portion that projects outward from the body portion and is in close contact with the groove wall of the groove. Expansion gasket.
[7]
The heat-expandable gasket according to any one of [1] to [6], wherein the groove is a joint between exterior panels of a building.
[8]
The heat-expandable gasket according to any one of [1] to [7], wherein the synthetic resin is a polyvinyl chloride-based resin.

In the present invention, by arranging a thread that does not melt at a temperature equal to or lower than the expansion start temperature of the heat-expandable material in a direction substantially parallel to the length direction of the gasket in the heat-expandable gasket, the heated and melted resin becomes a thread. By entwining with the resin, it is possible to prevent the molten resin from flowing down without using a phosphorus compound.

It is sectional drawing of the gasket as one Embodiment of this invention. It is a plan sectional view which shows the heat insulation and airtight outer wall structure using the gasket of FIG. It is a figure which shows the specimen panel used in the fire resistance test.

Hereinafter, embodiments of the gasket according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a heat expansion gasket (gasket) as an embodiment of the present invention.
The heat expansion gasket 3 of the present invention is a long heat expansion gasket containing a synthetic resin and a heat expansion material and inserted into a groove.
Threads 24 that do not melt at a temperature equal to or lower than the expansion start temperature of the heat-expandable material are arranged in the gasket substantially parallel to the longitudinal direction, and the expansion start temperature of the heat-expandable material is higher than the softening temperature of the synthetic resin. It is characterized by.
The softening temperature referred to in the present invention is the temperature measured by the A50 method specified in JIS K7206 (plastic-thermoplastic plastic-Vicat softening temperature (VST) test method).

The gasket 3 is inserted into the groove from the outside and closes the groove. Examples of the groove include joints between exterior panels of a building, which will be described later. As shown in FIG. 1, the gasket 3 includes a long plate-shaped body portion 21 and a projecting portion 22 projecting outward from the body portion 21 and in close contact with the groove wall of the groove.

The body portion 21 has a long rectangular plate-like outer shape, and is inserted so that both sides (both sides) located in the thickness direction B (direction orthogonal to the insertion direction A) face the groove wall. The tip surface 23 of the body portion 21 in the insertion direction A is a long rectangular plane extending along the extending direction of the groove.

The projecting portion 22 is a plurality of lips that are integrally formed with the body portion 21 and are formed so as to project outward from each of both side surfaces located in the thickness direction B of the body portion 21. When the gasket 3 is inserted into the groove, the protruding portion 22 is deformed while being in contact with the groove wall of the groove to be in close contact with the groove wall, and the position of the body portion 21 is set to the central position between the groove walls. Maintain stable.

The protruding portion 22 of the present embodiment is a lip that protrudes like a fin from both side surfaces of the body portion 21, but the shape of the protruding portion 22 is not limited to this, and the protruding portion 22 is in contact with the groove wall. It suffices if the structure is such that it is deformed by the means of Further, the protruding portion 22 of the present embodiment is integrally formed by using a material softer than the body portion 21 in order to facilitate deformation. For example, the protruding portion 22 is formed of the same material as the body portion 21. You may.

Such a heat-expandable gasket 3 is composed of a synthetic resin and a heat-expandable material.
As the synthetic resin used in the present invention, any thermoplastic resin can be used without any problem. For example, polyethylene-based resin, polypropylene-based resin, polystyrene-based resin, polyacrylonitrile-based resin, polyacrylonitrile styrene-based resin, ABS-based resin, acrylic resin, methacrylic resin, polyethylene terephthalate-based resin, polybutylene terephthalate-based resin, polyvinyl alcohol. Based resin, polyvinyl chloride resin, vinylidene chloride resin, vinylidene fluoride resin, polychlorotrifluoroethylene resin, polytetrafluoroethylene resin, polyamide resin such as nylon 6 or nylon 66, polyacetal resin , Polycarbonate resin, polyphenylensulfide resin, polyetherimide resin, polysulphon resin and the like can be used. Of these, polyvinyl chloride-based resins are preferable because they are flame-retardant and relatively inexpensive. These resins may be used alone or as a copolymer of two or more kinds of resins. As the polyvinyl chloride-based resin, a polymer of vinyl chloride alone or a copolymer of vinyl chloride containing 50% by weight or more of vinyl chloride and a resin other than that can be used.

As the heat-expandable material used in the present invention, a known material having an expansion start temperature of the heat-expandable material higher than the softening temperature of the synthetic resin can be used as it is. For example, a melamine compound such as melamine, urea, or thio. N-nitroso compounds such as urea, dinitrosopentamethylenetetramine, N, N-dinitrosopentamethylene, N-dimethylterephthalamide, azo compounds such as azobisisobutyronitrile and azodicarboxylicamide, benzenesulfonyl hydrazide, p-toluene. Examples thereof include sulfonyl hydrazide, sulfone hydrazide compounds such as p, p-oxy-bis (benzenesulfonyl hydrazide), chlorinated paraffin, or derivatives thereof, thermoexpandable graphite, hiruishi, pearlite, and black stone. These may be used alone or in combination of two or more. Among these, melamine compounds such as melamine and heat-expandable graphite are preferable, and heat-expandable graphite is more preferable because of ease of handling and availability. Further, the expansion ratio at the time of heating is preferably 100 cc or more per 1 g.
When using heat-expandable graphite, it is preferable to use 20 to 200 mesh. If it is coarser than 20 mesh, the mixing property with the rubber resin tends to deteriorate, and if it is finer than 200 mesh, the expansion ratio tends to decrease.

The heat-expandable material expands during heating to enhance the flame retardant performance of the gasket 3 of the present embodiment, and the gasket 3 expands to close the gap between the panels and enhance the fire resistance performance.
The thermal expansion component that expands during heating is preferably 0.1 to 10 parts by weight, more preferably 0.5 parts by weight to 5 parts by weight, still more preferably, with respect to 100 parts by weight of the synthetic resin. It is 1 to 3 parts by weight. If it is less than 0.1 parts by weight, when the gasket 3 of the present embodiment is heated, the expansion is insufficient, so that the gap between the panels cannot be closed and the fire resistance performance cannot be improved. On the other hand, if the amount is more than 10 parts by weight, the fluidity at the time of molding of the present embodiment deteriorates, and molding tends to be difficult.

In addition to these components, various additives such as fillers, flame retardants, and carbonizers are added to the heat-expandable gasket 3 of the present embodiment as necessary within a range that does not reduce the effect of the present embodiment. You can also.
Known fillers can be used, for example, titanium dioxide, silicon dioxide, aluminum oxide, zinc oxide, calcium carbonate, sodium carbonate, barium carbonate, calcium sulfate, barium sulfate, calcium silicate, magnesium silicate, fly ash. , Silica fume, talc, clay, clay, kaolin, silas, mica, pearlite, diatomaceous earth, glass fiber, glass flakes, silica sand, silicate powder, wallastnite, sand, resin powder (eg phenol resin powder, epoxy resin powder, etc.), etc. Can be mentioned. These remain as aggregates when the gasket 3 of the present embodiment is heated and expanded, and supplements the function of enhancing the shape retention.

Known flame retardants can be used, for example, bromine such as tetrabromobisphenol A, decabromodiphenyl ether, hexabromocyclododecane, tribromophenol, ethylenebistetrabromophthalimide, brominated polystyrene, ethylenebispentabromodiphenyl. Flame retardants, chlorinated paraffin, chlorinated polyethylene, chlorinated alicyclic compounds, chlorine-based flame retardants such as chlorinated phosphate, red phosphorus, phosphorus trichloride, phosphorus pentachloride, ammonium phosphate, ammonium polyphosphate, sub Inorganic phosphorus flame retardants such as aluminum phosphate, organic phosphorus flame retardants such as phosphate esters, antimony trioxide, antimony trioxide and other antimony flame retardants, aluminum hydroxide, magnesium hydroxide, borate compounds, molybdenum Examples thereof include inorganic flame retardants such as compounds, tin compounds and metal oxides. These play a role of enhancing the flame retardancy of the heat expansion gasket 3.
Known carbonizers can be used, and examples thereof include polyhydric alcohols such as pentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, and trimethylolpropane, starch, and casein. These form carbides by dehydration during heating, and supplement the function of enhancing shape retention.
Further, the heat-expandable gasket 3 of the present embodiment includes various additives such as known surfactants, cross-linking agents, foam-forming agents, catalysts, stabilizers, ultraviolet absorbers, antioxidants, lubricants, plasticizers, and pigments. May be included as appropriate.

The heat-expandable gasket 3 of the present invention is produced by melting, kneading, and molding a formulation using the above raw materials.
As the molding, a known method can be used, and for example, extrusion molding, press molding, calendar molding and the like can be used.

In the heat-expandable gasket 3 of the present invention, a thread 24 that does not melt at a temperature equal to or lower than the expansion start temperature of the heat-expandable material is arranged in the gasket 3 substantially parallel to the longitudinal direction.
As a method of arranging the yarn 24 which does not melt below the expansion start temperature of the heat expansion material in the direction substantially parallel to the length direction of the gasket 3 in the heat expansion gasket 3, the yarn may be arranged at the same time as molding. Good. In the case of extrusion molding, it is easy to insert the thread 24 in the length direction at the time of molding, which is more preferable. A method of forming a portion (hole or groove) into which the thread 24 is inserted at the time of molding and arranging the thread 24 there after molding may be used, or a portion (hole or groove) into which the thread 24 is inserted after molding is created and the thread 24 is arranged there. It may be a method. The direction of the threads 24 may be substantially parallel to the length direction of the gasket 3, and may be arranged in a spiral or zigzag shape, for example, if they are approximately parallel.

As the material of the thread 24, a known material can be used as long as the thread does not melt below the expansion start temperature of the heat expansion material. For example, cotton yarn, polyester resin yarn, polyamide resin yarn, glass fiber, metal fiber, ceramic fiber and the like can be used. The cotton yarn is inexpensive and easily available, and is preferable because it carbonizes and remains as heating progresses and also plays a role of maintaining the shape of the heat-expandable gasket 3 after expansion.
The thickness of the thread 24 is preferably 0.2 to 4 mm in diameter, and more preferably 0.5 mm to 3 mm in diameter. If the diameter is less than 0.2 mm, it is easily cut when heated, and it is difficult to obtain the effect of preventing the resin from flowing down. Further, if the diameter exceeds 4 mm, the ratio of the resin to the entire gasket 3 is relatively reduced, so that the expansion during heating is reduced and the gap (joint) between the panels may not be closed.
The density of the threads 24 is preferably 0.3 to 15 threads per square cm of the cross section of the heat expansion gasket 3 in the length direction, and more preferably 0.5 to 5 threads per square cm. If the number is less than 0.3, it may not be possible to prevent the resin from flowing down when the heat expansion gasket 3 is heated and the resin melts. Further, if the number exceeds 15, the proportion of the resin is relatively reduced, so that the expansion during heating is reduced and the gap between the panels may not be closed.
The yarn 24 is preferably a twisted yarn rather than a single yarn because the heated and melted resin is easily entangled with the yarn 24.
When the heat expansion gasket 3 of the present embodiment is heated, the resin melts, but the thread retains its shape. Therefore, the resin is entangled with the resin, so that the resin flows down even at the joints between the vertical panels. Never. The heat-expandable material then begins to expand and closes the gaps between the panels.

Hereinafter, the heat-insulating and airtight outer wall structure 1 of a building (house) to which the gasket 3 of the present invention is applied will be described with reference to FIG.

FIG. 2 is a plan sectional view showing a heat insulating and airtight outer wall structure 1. Note that FIG. 2 is a plan sectional view showing only the periphery of one pillar 100 in the heat-insulating and airtight outer wall structure 1 that covers the periphery of the building.

The heat-insulating and airtight outer wall structure 1 is formed on the outdoor side of the pillar 100 as a pillar member, at a plurality of composite panel units 2 connected so as to surround the periphery of the building, and at a joint 12 as a groove between the plurality of composite panel units 2. A gasket 3 to be inserted and a gypsum board (not shown) as an interior material provided on the indoor side of the pillar 100 are provided.

The composite panel unit 2a includes an exterior panel layer 4a, a board-shaped heat insulating material layer 5a located on the inner surface side of the exterior panel layer 4a, and a board surface material 7a attached to the inner surface of the board-shaped heat insulating material layer 5a. It is a panel material in which a filled heat insulating material layer 8a formed on the inner surface of the board surface material 7a and a ventilation furring strip 9a located between the exterior panel layer 4a and the board-shaped heat insulating material layer 5a are integrated. Here, the indoor side of the building is referred to as the "inner surface side", and the outdoor side is referred to as the "outer surface side". Further, the vertical direction is described as "vertical direction", and the horizontal direction orthogonal to the internal and external directions is described as "horizontal direction". Further, "left side" and "right side" shall indicate directions when viewed from the outer surface side.

The exterior panel layer 4a is a plate-shaped layer formed by connecting a plurality of exterior panels 10 having a quadrangular outer shape when viewed from the inner surface side and the outer surface side in the vertical direction and the horizontal direction. More specifically, the exterior panels 10 are connected in the vertical direction so that the upper and lower surfaces are adjacent to each other, and are connected in the left-right direction so that the left and right side surfaces are adjacent to each other.

In the exterior panel layer 4a, the two exterior panels 10 adjacent to each other in the vertical direction are adjacent to each other so that the lower surface of the exterior panel 10 located on the upper side and the upper surface of the exterior panel 10 located on the lower side are in contact with each other. ing. Further, in the exterior panel layer 4a, the two exterior panels 10 adjacent to each other in the left-right direction are adjacent to each other so that the right surface of the exterior panel 10 located on the left side and the left surface of the exterior panel 10 located on the right side are in contact with each other. There is. In the exterior panel layer 4a, the joint portions of the exterior panel 10 in the vertical direction and the horizontal direction are filled with a joint treatment material such as a wet sealing material.

In the exterior panel layer 4a shown here, a panel made of lightweight foam concrete (ALC panel) is used as the exterior panel 10, but the material of the exterior panel 10 is not limited to this, and for example, a wood-based panel or the like is used. Metallic siding or the like can also be used. Further, the number of exterior panels 10 constituting the exterior panel layer can be appropriately determined according to the floor height of the building, the distance between pillars, the design, and the like. Further, the dimensions of the exterior panel 10 itself and the dimensions of the entire exterior panel layer 4a can be appropriately determined according to the design of the building and the like. For example, the width for closing the space between adjacent pillars is set to half (0. It can have a width of 9 m) to 2 (3.6 m).

The board-shaped heat insulating material layer 5a is a plate-shaped layer formed by connecting a plurality of board-shaped heat insulating materials 11 having a square outer shape when viewed from the inner surface side and the outer surface side in the vertical direction and the horizontal direction. is there. More specifically, the board-shaped heat insulating material 11 is connected in the vertical direction so that the upper and lower surfaces are adjacent to each other, and is connected in the left-right direction so that the left and right side surfaces are adjacent to each other. Therefore, even when the board-shaped heat insulating material layer 5a is viewed as a whole, it has a quadrangular outer shape when viewed from the inner surface side and the outer surface side.

It is preferable that the upper and lower surfaces of the plurality of board-shaped heat insulating materials 11 and the joint portions between the left and right side surfaces are adjacent to each other so as to be in contact with each other in order to ensure airtightness. However, the seams may be adjacent to each other with a gap of a predetermined interval (for example, 5 mm) or less. In the board-shaped heat insulating material layer 5a, an airtight tape such as acrylic or butyl rubber is applied to the joint portion between the adjacent board-shaped heat insulating materials 11 from the outer surface side or the inner surface side. It is pasted so as to straddle both of them.

In the board-shaped heat insulating material layer 5a shown here, a solid board-shaped heat insulating material made of phenol foam is used as the board-shaped heat insulating material 11, but the present invention is not limited to this, and a constant outer shape can be maintained. It may be a molded solid heat insulating material, and for example, a solid board-shaped heat insulating material made of extruded expanded polystyrene (XPS) or beaded polystyrene foam (EPS) can be used.

Here, while the inner and outer surfaces of the board-shaped heat insulating material layer 5a have a height dimension substantially equal to that of the exterior panel layer 4a described above, the width (length in the left-right direction) is the width of the exterior panel layer 4a described above. It is configured slightly larger than.

With such a configuration, the right surface of the board-shaped heat insulating material layer 5a in the composite panel unit 2a and the left surface of the board-shaped heat insulating material layer 5b in the composite panel unit 2b are adjacent to each other or at a predetermined interval so as to be in contact with each other. When they are adjacent to each other with the following gaps apart (see FIG. 2), they are linear in the vertical direction between the right surface of the exterior panel layer 4a in the composite panel unit 2a and the left surface of the exterior panel layer 4b in the composite panel unit 2b. A joint 12 (groove) extending to can be formed. Further, the joint portion where the right surface of the board-shaped heat insulating material layer 5a in the composite panel unit 2a and the left side surface of the board-shaped heat insulating material layer 5b in the composite panel unit 2b are adjacent to each other is formed at the groove bottom along the extending direction of the joint 12. It can be located at the bottom of the joint. The joint 12 shown here has a width of about 10 mm. Further, the depth from the outer surface of the exterior panel layer 4a to the joint base is 28 mm or more (the thickness of the exterior panel 10 is 12 mm or more, and the thickness of the ventilation furring strip 9a (ventilation layer) is 15 mm or more).

More specifically, the board-shaped heat insulating material layer 5a includes a board surface material 7a attached to the inner surface of the board-shaped heat insulating material layer 5a, and a ventilation furring strip 9a provided on the outer surface of the board-shaped heat insulating material layer 5a. At the same time, it is directly fixed to the pillar 100 by the screw 91. Further, the exterior panel layer 4a is indirectly fixed to the pillar 100 by being directly fixed to the ventilation furring strip 9a and the board-shaped heat insulating material layer 5a located on the inner surface side of the exterior panel layer 4a by the screws 92. Is fixed.

The board surface material 7a is attached to the entire inner surface of the board-shaped heat insulating material layer 5a in order to maintain the shape of the entire composite panel unit 2a and prevent damage to the board-shaped heat insulating material layer 5a.

The filled heat insulating material layer 8a is a heat insulating material layer laminated on the inner surface of the board surface material 7a. The filled heat insulating material layer 8a can be formed of a solid heat insulating material like the board-shaped heat insulating material 11, but is not limited to the solid heat insulating material, and is not limited to the solid heat insulating material. For example, the heat insulating material formed of glass wool or rock wool is used. It can also be a material layer. The filled heat insulating material layer 8a is fixed to the board surface material 7a with an adhesive, double-sided tape, or the like. In addition, in order to suppress dew condensation in the wall, it is preferable that the thermal resistance value of the filled heat insulating material layer 8a is smaller than the thermal resistance value of the board-shaped heat insulating material layer 5a.

The ventilation furring strip 9a is a long member having a rectangular cross section and is long in the vertical direction. The ventilation furring strip 9a is sandwiched between the exterior panel layer 4a and the board-shaped heat insulating material layer 5a. Further, a plurality of ventilation furring strips 9a are arranged apart from each other in the left-right direction. As a result, a ventilation layer is formed between the ventilation furring strips 9a adjacent to each other in the left-right direction. The separation distance between the ventilation furring strips 9a adjacent to each other in the left-right direction can be, for example, about 300 mm, and the exterior panel layer 4a is fixed to each ventilation furring strip 9a by a screw 92 or the like.

The composite panel unit 2a shown here is configured to include an exterior panel layer 4a, a board-shaped heat insulating material layer 5a, a board surface material 7a, a filled heat insulating material layer 8a, and a ventilation furring strip 9a, but is limited to this structure. It may be a configuration that includes at least an exterior panel layer, a board-shaped heat insulating material layer, and a mounting base material, and is, for example, a composite panel unit that does not have the above-mentioned board surface material 7a and filled heat insulating material layer 8a. You can also do it.

The composite panel unit 2b includes an exterior panel layer 4b, a board-shaped heat insulating material layer 5b located on the inner surface side of the exterior panel layer 4b, and a board surface material 7b attached to the inner surface of the board-shaped heat insulating material layer 5b. It is a panel material in which a filled heat insulating material layer 8b formed on the inner surface of the board surface material 7b and a ventilation furring strip 9b located between the exterior panel layer 4b and the board-shaped heat insulating material layer 5b are integrated. Since the configuration of each member of the composite panel unit 2b is the same as that of the composite panel unit 2a described above, the description thereof is omitted here.

As shown in FIG. 2, in the heat-insulating and airtight outer wall structure 1, the composite panel unit 2a and the composite panel unit 2b have joints 12 formed between the left and right side surfaces of the exterior panel layers 4a and 4b on the outer surface side of the pillar 100. As described above, the board-shaped heat insulating material layers 5a and 5b are arranged so that the left and right side surfaces of the board-shaped heat insulating material layers 5a and 5b are brought into contact with each other to form a joint portion adjacent to each other or adjacent to each other with a gap of a predetermined interval or less. There is.

In other words, in a state where the composite panel unit 2a and the composite panel unit 2b are connected as shown in FIG. 2, the exterior panel 10a constituting the exterior panel layer 4a and the exterior panel 10b constituting the exterior panel layer 4b are , The joints 12 as grooves are arranged so as to be separated from each other in the left-right direction.

Further, the board-shaped heat insulating material 11a constituting the board-shaped heat insulating material layer 5a and the board-shaped heat insulating material 11b forming the board-shaped heat insulating material layer 5b are exteriorized on the inner surface side of the two exterior panels 10a and 10b described above. It is arranged along the inner surface of the panels 10a and 10b. Further, the board-shaped heat insulating materials 11a and 11b are arranged so that the joint portions thereof are located at the joint bottom (groove bottom) along the extending direction of the joint 12 (groove). That is, when the heat insulating and airtight outer wall structure 1 is viewed from the outer surface side, the joint portion of the board-shaped heat insulating material 11a and 11b, that is, the right outer edge portion of the board-shaped heat insulating material 11a and the left outer edge portion of the board-shaped heat insulating material 11b It extends so as to be located in the joint 12. The "seam portion of the two board-shaped heat insulating materials" is arranged adjacent to each other by contacting the outer edges of the two board-shaped heat insulating members, or adjacent to each other with a gap of a predetermined interval or less. Means both outer edges.

The gasket 3 is inserted into the joint 12 as a groove extending in the vertical direction, and closes the joint 12 in the extending direction of the joint 12.
In the present invention, since the thread 24 that does not melt below the expansion start temperature of the heat expansion material is arranged in the heat expansion gasket 3 in a direction substantially parallel to the length direction of the gasket 3, it is heated and melted. Since the resin is entangled with the thread 24, it is possible to prevent the molten resin from flowing down without using a phosphorus compound.
By using such a gasket 3 in a house, it is possible to block flames and high-temperature air during heating, for example, in the event of a fire, and it is possible to improve fire resistance.

Here, the gasket 3 of the present embodiment is a backup material (backer) in which the wet sealing material 80 as a joint treatment material is filled on the outer surface side. The wet sealant 80 is filled on the outer surface side of the gasket 3. If the gasket 3 is used as a backer and the outer surface side thereof is filled with the wet sealing material 80, the wet sealing material 80 adheres to the side surface of the exterior panel 10 without any gap, so that the airtightness and waterproofness of the joint 12 are further improved. At the same time, the design of the exterior of the building can be improved.

Next, Examples and Comparative Examples performed for confirming the effect of the present invention will be described.
(Example)
1% by weight of thermally expandable graphite (expansion start temperature 300 ° C.) was mixed with polyvinyl chloride having a softening temperature of 85 ° C., and a molded product having a cross section of 5 × 40 mm was obtained by extrusion molding. After that, three grooves with a width of 2 mm and a depth of 4 mm were formed on a surface having a width of 40 mm at positions of 10 mm, 20 mm, and 30 mm from one end in the width direction, and octopus yarn (twisted cotton yarn) having a thickness of about 2 mm was formed there. ) Was placed, and this was used as a gasket.

(Comparison example)
1% by weight of thermally expandable graphite (expansion start temperature 300 ° C.) was mixed with polyvinyl chloride having a softening temperature of 85 ° C., and a molded product having a cross section of 5 × 40 mm was obtained by extrusion molding, and this was used as it was as a gasket.

A test piece panel as shown in FIG. 3 was prepared, gaskets of Examples and Comparative Examples were inserted into the two joints, respectively, and caulking was further filled from above. The caulking height was set to match the chamfered bottom of the exterior panel (power board).
The gaskets of Examples and Comparative Examples were subjected to a fire resistance test for 30 minutes.
The test piece panel was installed in a small refractory furnace for walls with the ALC plate side as the heating surface. The furnace was heated with a gas burner so that the temperature inside the furnace was in line with the standard heating temperature curve of ISO834.

As a result, it was confirmed that in the gasket of the example, smoke did not come out to the outside of the furnace after 30 minutes of heating, and the joint was sufficiently blocked. On the other hand, in the gasket of the comparative example, it was confirmed that a large amount of smoke was emitted from the upper joint to the outside of the furnace after 30 minutes of heating, and it was confirmed that the gasket melted and flowed down to form a gap. ..
Based on the above results, it is possible to prevent the molten resin from flowing down by arranging threads that do not melt below the expansion start temperature of the heat expansion material in a direction substantially parallel to the length direction of the gasket in the heat expansion gasket. It was confirmed that

Although the embodiments of the present invention have been described above, the present invention is not limited to this, and can be appropriately changed without departing from the spirit of the invention.

By using the heat-expandable gasket according to the present invention, the heated and melted resin is entangled with the thread, so that the molten resin can be prevented from flowing down, and is widely used as a gasket for joints between exterior panels of buildings. be able to.

1: Insulation and airtight outer wall structure 2: Composite panel unit 2a, 2b: Composite panel unit 3: Gasket 4a, 4b: Exterior panel layer 5a, 5b: Board-shaped insulation layer 7a, 7b: Board surface material 8a, 8b: Filled insulation Material layers 9a, 9b: Ventilation furring strip 10: Exterior panel 10a, 10b: Exterior panel 11: Board-shaped heat insulating material 11a, 11b: Board-shaped heat insulating material 12: Joint 21: Body 22: Protruding portion 23: Tip surface 24: Thread 80: Wet sealant 91, 92: Screw 100: Pillar

Claims (8)

A long heat-expandable gasket that contains a synthetic resin and a heat-expandable material and is inserted into a groove.
Threads that do not melt at a temperature equal to or lower than the expansion start temperature of the heat-expandable material are arranged in the gasket substantially parallel to the longitudinal direction.
A heat-expandable gasket characterized in that the expansion start temperature of the heat-expandable material is higher than the softening temperature of the synthetic resin. The heat-expanding gasket according to claim 1, which is manufactured by extrusion molding. The heat-expandable gasket according to claim 1 or 2, wherein the heat-expandable material is heat-expandable graphite. The heat-expandable gasket according to any one of claims 1 to 3, wherein the yarn is cotton yarn. The heat-expandable gasket according to any one of claims 1 to 4, wherein the yarn is a twisted yarn. The heat-expanding gasket according to any one of claims 1 to 5, further comprising a long plate-shaped body portion and a projecting portion that protrudes outward from the body portion and comes into close contact with the groove wall of the groove. .. The heat-expanding gasket according to any one of claims 1 to 6, wherein the groove is a joint between exterior panels of a building. The heat-expandable gasket according to any one of claims 1 to 7, wherein the synthetic resin is a polyvinyl chloride-based resin.

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