JP7091205B2 - Covering method - Google Patents

Description

The present invention relates to a method for coating a heat-foamable sheet that forms a carbonized heat insulating layer by increasing the temperature.

Conventionally, in building structures, it has been required to make main structures such as columns, beams, floors, and walls heat-resistant structures for the purpose of protecting the buildings from fire.
As one of the methods for applying a heat-resistant structure, a construction method using a heat-foamable sheet as a base material for a main structure or the like is adopted. The heat-foamable sheet is thin and lightweight in normal times, and has the effect of foaming and carbonizing to form a heat insulating layer and exhibiting heat-resistant protection against a temperature rise due to a fire or the like.

The heat-foamable sheet is fixed to a base material such as a structure via a fixing tool such as a welding pin or an adhesive (adhesive). In this case, depending on the fixing method, fixing location, etc., the temperature rise due to a fire or the like may cause the heat-foamable sheet to fall off or shift. In particular, a gap is likely to occur between the base material and the end portion of the heat-foamable sheet, or the end portion of the heat-foamable sheet, and it may be difficult to obtain the desired heat resistance. Therefore, there is known a method (for example, Patent Document 1) in which a refractory tape is attached to a joint portion formed by abutting the heat-foamable sheets together.

Japanese Unexamined Patent Publication No. 2013-68023

However, simply attaching the refractory tape to the joint may cause the refractory tape to peel off, turn over, fall off, etc. at high temperatures, and it may be difficult to maintain the desired heat resistant protection performance.

As a result of diligent research to solve the above problems, the present inventors usually cover a base material with one or more heat-foamable sheets and then use a specific long member. The present invention has been completed by finding that sufficient heat-resistant protection can be obtained by sometimes having excellent adhesiveness and exhibiting excellent drop-off prevention property and slip-off prevention property when the temperature rises.

That is, the present invention has the following features.
1. 1. It is a coating method using a heat-foamable sheet.
After coating the substrate with one or more heat-foamable sheets,
A long member is attached to one or more joint portions selected from the boundary portion between the base material and the end portion of the heat-foamable sheet, the abutting portion between the heat-foamable sheets, or the overlapping portion between the heat-foamable sheets. It ’s something to wear,
The long member is a laminated body in which an adhesive layer and a heat foam layer forming a carbonized heat insulating layer due to temperature rise are laminated.
The adhesive layer contains a synthetic resin and a cross-linking agent.
A coating method characterized by the synthetic resin containing a hydroxyl group-containing acrylic resin and a fluororesin.
2. 2. 1. The synthetic resin contains a hydroxyl group-containing acrylic resin and a hydroxyl group-containing fluororesin. The coating method described in.

In the coating method using the heat-foamable sheet of the present invention, after one or more heat-foamable sheets are coated on the base material, the boundary between the base material and the end of the heat-foamable sheet, the heat. By using a specific long member for one or more kinds of joints selected from the abutting portion between the foamable sheets or the overlapping portion between the heat-foamable sheets, it has excellent adhesiveness in normal times. When the temperature rises, the long member is prevented from peeling, turning over, falling off, etc., and the heat resistance of the connecting part is increased. Heat resistance can be enhanced.

It is a perspective view which shows an example of the long member (laminate body) of this invention. It is a perspective view which shows an example of the aspect which the base material is coated with the heat foaming sheet. It is a figure which shows an example of the connection part. It is a perspective view which shows an example of the aspect which the base material is coated with the heat foaming sheet. It is a figure which shows an example of the connection part. It is a perspective view which shows an example of the covering structure obtained by the covering method.

1. 1. Long member 11. Adhesive layer 12. Thermal foam layer 13. Releasable sheet 2. Thermal foaming sheet 21. Adhesive (for heat foamable sheet)
22. Fixing member (for heat foamable sheet)
3. 3. Base material 31. Square steel frame (steel prism)
32. H-shaped steel frame (H-shaped beam)
33. Structural material (floor material)
4. Fixing member A. Joint part A1. Butt portion between heat-foamable sheets A2. Overlapping parts of heat-foamable sheets A3. Boundary between the substrate and the edge of the heat-foamable sheet

Hereinafter, the present invention will be described in detail based on the embodiments thereof.
In the coating method of the present invention, after coating one or two or more heat-foamable sheets on a base material, a boundary portion between the base material and the end portion of the heat-foamable sheet, a butt portion between the heat-foamable sheets, or a butt portion. A long member is attached to a joint portion selected from the overlapping portions of the heat-foamable sheets.

<Base material>
The base material is not particularly limited as long as it requires heat resistance, but mainly includes materials constituting columns, beams, floors, walls, etc. of building structures, and is formed of, for example, metal. Steel materials such as square steel, round steel, H-shaped steel, and other various metals, or mortar, concrete, calcium silicate board, gypsum board, calcium carbonate foam board, non-combustible volcanic vitreous multi-layer board, fiber reinforced cement. Examples thereof include structural materials such as boards and lightweight cement boards. Further, the surface of the base material may be treated with a rust preventive agent or a rust preventive paint.

<Thermal foaming sheet>
The heat-foamable sheet of the present invention foams as the temperature rises (preferably 200 ° C. or higher, more preferably 250 ° C. or higher) to form a carbonized layer. As the constituent component of the heat-foamable sheet, for example, one containing a resin component, a flame retardant, a foaming agent, a carbonizing agent and a filler is suitable. Among these, the resin component is, for example, a vinyl resin, a polystyrene resin, a polypropylene resin, an acrylic resin, a polyamide resin, a polyurethane resin, a thermoplastic resin such as a vinyl acetate resin, or the like, and the flame retardant is, for example. As a foaming agent, for example, melamine, dicyandiamide, azodicarbonamide, etc., as a carbonizing agent, for example, pentaerythritol, dipentaerythritol, etc., as a filler, for example, talc, calcium carbonate, etc. Examples thereof include zinc oxide and titanium dioxide.

The blending ratio of each component is preferably 50 to 1000 parts by weight of the flame retardant, 5 to 500 parts by weight of the foaming agent, 5 to 600 parts by weight of the carbonizing agent, and filling with respect to 100 parts by weight of the resin component in terms of solid content. The agent is 10 to 300 parts by weight.

The heat-foamable sheet of the present invention may further contain pigments, fibers and the like. As the pigment, a general coloring pigment (organic pigment / inorganic pigment) can be used. Further, expandable graphite, unexpanded vermiculite and the like may be blended in order to further enhance the heat resistance.

The heat-foamable sheet used in the present invention can be produced by a known method. For example, a method of adding an appropriate solvent to a composition containing an appropriate amount of the above-mentioned synthetic resin, flame-retardant agent, foaming agent, carbonizing agent, etc., pouring it into a mold, drying the composition, and then removing the mold; Is applied to the release paper by a heating coating machine and then wound up; a method of processing the composition kneaded by a kneader into a sheet shape by an extrusion molding machine; a method of kneading the composition by a kneader between rolls. A method of supplying and processing into a sheet; a method of pelletizing the composition and then processing it into a sheet by an extrusion molding machine; a calender consisting of a plurality of heat rolls of the composition kneaded with a Banbury mixer, a mixing roll or the like. Examples thereof include a method of rolling and processing into a sheet.

Further, a reinforcing sheet can be laminated on the heat-foamable sheet. Examples of the reinforcing sheet include woven fabric, non-woven fabric, and mesh. By laminating such a reinforcing sheet, it is possible to improve the adhesiveness and adhesion, and further prevent the falling-off prevention property and the slip-off prevention property.

The thickness of the heat-foamable sheet of the present invention may be appropriately set depending on the application site and the like, but is preferably 0.2 mm or more and 10 mm or less, and more preferably 0.5 mm or more and 6 mm or less. Further, the length may be appropriately set, and a long body of a heat-foamable sheet may be produced and wound in a spiral shape. The winding body can be cut and used according to the required length.

<Long member>
The long member of the present invention is a laminated body in which an adhesive layer and a heat-foaming layer forming a carbonized heat insulating layer due to temperature rise are laminated, and the boundary portion between the base material and the end portion of the heat-foamable sheet is described above. It is used by being attached to a butt portion between heat-foamable sheets or a joint portion selected from the overlapping portion between the heat-foamable sheets.

The adhesive layer of the long member is formed of an adhesive containing a synthetic resin and a cross-linking agent, and the synthetic resin is characterized by containing a hydroxyl group-containing acrylic resin and a fluororesin. By using such an adhesive, it has excellent adhesiveness, exhibits excellent heat resistance when the temperature rises, prevents peeling, turning, falling off, etc. of long members, and improves the heat resistance of the joint. As a result, the heat-resistant protective property of the base material can be enhanced by exhibiting the property of preventing the heat-foamable sheet from falling off and the property of preventing the sheet from slipping off. The mechanism of action is not limited to the following, but the decomposition temperature of the resin skeleton shifts to the high temperature region due to the incorporation of the fluororesin into the resin skeleton formed by the hydroxyl group-containing acrylic resin, resulting in excellent heat resistance. It is considered that the effect of the present invention can be obtained. The adhesive of the present invention also includes an adhesive.

The hydroxyl group-containing acrylic resin is obtained by using a hydroxyl group-containing monomer and an alkyl-containing (meth) acrylic monomer as essential components and, if necessary, copolymerizing with other monomers.

As the polymerization method, a known method may be adopted. For example, solution radical polymerization, suspension polymerization, bulk polymerization, emulsion polymerization and the like can be adopted, and an initiator or the like can also be used at the time of polymerization.

Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 5-hydroxypentyl (meth) acrylate, and 6-hydroxyhexyl (meth). ) Primary hydroxyl group-containing (meth) acrylic monomers such as hydroxyalkyl (meth) acrylate monomers such as acrylates and 8-hydroxyoctyl (meth) acrylates,
Secondary hydroxyl group-containing (meth) acrylic monomers such as 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 3-chloro2-hydroxypropyl (meth) acrylate,
Tertiary hydroxyl group-containing (meth) acrylic monomers such as 2-hydroxy-2-methylpropyl (meth) acrylate,
Further, glycerol mono (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol (meth) acrylate, caprolactone-modified (meth) acrylic acid ester, N-hydroxyethyl acrylamide and the like can be mentioned, and one of them can be mentioned. Alternatively, two or more types can be used.

Examples of the alkyl-containing (meth) acrylic monomer include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, tert-butyl (meth) acrylate, and n. -Propyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl. Examples thereof include (meth) acrylate and cyclohexyl (meth) acrylate, and one or more of these can be used.

Other monomers include, for example,
Carboxyl group-containing monomers such as (meth) acrylic acid, maleic acid, fumaric acid, crotonic acid, and itaconic acid,
Amino group-containing monomers such as dimethylaminoethyl (meth) acrylate and dimethylaminopropyl (meth) acrylate,
Amide group-containing monomers such as (meth) acrylamide and ethyl (meth) acrylamide,
Nitrile group-containing monomers such as acrylonitrile,
Epoxy group-containing monomers such as glycidyl (meth) acrylate,
γ- (meth) acryloxypropyltrimethoxysilane, γ- (meth) acryloxypropyltriethoxysilane, γ- (meth) acryloxypropylmethyldimethoxysilane, γ- (meth) acryloxypropylmethyldiethoxysilane, etc. Hydrolytic silyl group-containing vinyl monomer,
Aromatic hydrocarbon-based vinyl monomers such as styrene, methylstyrene, chlorostyrene, vinyltoluene, etc.
Sulfonic acid-containing vinyl monomers such as styrene sulfonic acid and vinyl sulfonic acid,
Chlorine-containing monomers such as vinyl chloride, vinylidene chloride, chloroprene, etc.
Α-olefins such as ethylene, propylene and isobutylene,
Vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl pivalate, etc.
Vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, butyl vinyl ether, cyclohexyl vinyl ether, etc.
Allyl ethers such as ethyl allyl ether and butyl allyl ether,
Etc., and one or more of these can be used.

In the adhesive used in the present invention, the fluororesin used in combination (mixed and used) with the hydroxyl group-containing acrylic resin is not particularly limited, but for example.
(I) Fluorine-containing monomer alone or copolymer,
(Ii) A copolymer of a fluorine-containing monomer, a hydroxyl group-containing monomer, and other polymerizable monomers,
And so on. Further, the fluororesin may be a solvent-based resin such as a solvent-soluble resin or a non-aqueous dispersion resin, or a powder resin, but in the present invention, the solvent-soluble resin is preferable.

Examples of the fluorine-containing monomers of (i) and (ii) include perfluoroolefins such as tetrafluoroethylene, chlorotrifluoroethylene and hexafluoropropylene, and fluoroolefin monomers such as vinyl fluoride and vinylidene fluoride.
Examples thereof include fluoroalkyl group-containing acrylic monomers such as perfluoromethylmethacrylate, perfluoroisononylmethylmethacrylate, 2-perfluorooctylethyl acrylate, 2-perfluorooctylethyl methacrylate, and trifluoroethyl acrylate. These can be used in one type or two or more types.

Specific examples of the fluorine-containing monomer alone or copolymer of (i) above include polyvinylfluoride (PVF), polyvinylidenefluoride, polytrifluoroethylene, polychlorotrifluoroethylene, and polytetrafluoroethylene. Monopolymer;
Examples thereof include copolymers such as tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, ethylene-tetrafluoroethylene copolymer, and ethylene-chlorotrifluoroethylene copolymer.

Further, as described in (i) above, those modified with an acrylic resin can also be used. As such an acrylic resin composite fluororesin, for example, a mixture and / or a reactant of the acrylic resin and the fluorine-containing resin can be used, and in particular, the powdery acrylic resin composite polytetrafluoroethylene is used in the adhesive. It has excellent dispersibility and can further enhance the effect of the present invention.

Examples of the hydroxyl group-containing monomer of (ii) include hydroxyalkyl vinyl ethers such as hydroxyethyl vinyl ether, hydroxypropyl vinyl ether, hydroxybutyl vinyl ether, and hydroxypentyl vinyl ether; ethylene glycol monoallyl ether, diethylene glycol monoallyl ether, and triethylene glycol monoallyl. Hydroxyallyl ethers such as ethers; hydroxyl group-containing (meth) acrylates such as 2-hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 4-hydroxyethyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. One or more of these can be used.

Examples of other polymerizable monomers include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, and n-amyl (meth) acrylate. Isoamyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, octadecyl (meth) acrylate, cyclohexyl (meth) Alkyl-containing (meth) acrylic monomers such as acrylate; dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, dimethylamino (meth) acrylate, aminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, etc. Amino group-containing monomers; carboxyl group-containing monomers such as acrylic acid, methacrylic acid, crotonic acid, maleic acid or its monoalkyl ester, itaconic acid or its monoalkyl ester, fumaric acid or its monoalkyl ester; (meth) acrylamide, ethyl Amid-containing monomers such as (meth) acrylamide; nitrile group-containing monomers such as (meth) acrylonitrile; epoxy group-containing monomers such as glycidyl (meth) acrylate; aromatic vinyl monomers such as styrene, methylstyrene, chlorostyrene and vinyltoluene; Vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl pivalate; olefin-based monomers such as ethylene and propylene can be mentioned, and one or more of these can be used as needed.

In the present invention, it is preferable that the fluororesin is a hydroxyl group-containing fluororesin obtained by copolymerizing the above-mentioned (ii) fluorine-containing monomer and a hydroxyl group-containing monomer as essential components and other polymerizable monomers. Thereby, the effect of the invention can be further enhanced. The mechanism of action is not limited to the following, but since the hydroxyl group-containing fluororesin is likely to be stably incorporated into the resin skeleton formed by the hydroxyl group-containing acrylic resin, the decomposition temperature of the resin skeleton is stably stabilized in a high temperature region. It is considered that the effect of the present invention can be enhanced by exhibiting excellent heat resistance.

The mixing ratio (solid content weight ratio) of the hydroxyl group-containing acrylic resin and the fluororesin is preferably 99.5 to 0.5 to 80:20 (more preferably 99: 1 to 90:10, still more preferably 98). : 2 to 92: 8). In such a range, it has excellent adhesiveness in normal times, and can exhibit excellent drop-off prevention property and slip-off prevention property when the temperature rises. When it is below the upper limit of the above range, it shows excellent adhesiveness, and when it is above the lower limit of the above range, it sufficiently exhibits excellent drop-off prevention property and slip-off prevention property when the temperature rises. Can be done.

Examples of the cross-linking agent contained in the adhesive of the present invention include isocyanate group-containing compounds and the like.

Examples of the isocyanate group-containing compound include tolylene diisocyanate compounds such as 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate; 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, and tetra. Xylylene diisocyanate compounds such as methyl xylylene diisocyanate; aromatic isocyanate compounds such as 1,5-naphthalenedi isocyanate and triphenylmethane triisocyanate; hexamethylene diisocyanate, isophorone diisocyanate, and these isocyanate compounds and trimethyl propane and the like. Examples thereof include an adduct form with the polyol compound of the above, a buretto form and an isocyanurate form of these polyisocyanate compounds, and one or more of these can be used.

The mixing ratio of the cross-linking agent is preferably 0.5 to 20 parts by weight, more preferably 1 to 10 parts by weight, still more preferably 2 to 5 parts by weight, based on 100 parts by weight of the solid content of the synthetic resin. Is. In such a range, the effect of the present invention can be fully exerted. When it is below the upper limit of the above range, it shows excellent adhesiveness, and when it is above the lower limit of the above range, it sufficiently exhibits excellent drop-off prevention property and slip-off prevention property when the temperature rises. Can be done.

In the present invention, the hydroxyl group-containing acrylic resin and the like can be used in combination with a curing catalyst that promotes the reaction of the cross-linking agent. The curing catalyst is, for example, a substance having an action of accelerating the reaction of isocyanate groups to cure. Examples of the curing catalyst include various types such as amine-based catalysts, organometallic-based catalysts, and inorganic-based catalysts.

The adhesive of the present invention is not particularly limited as long as it contains the above synthetic resin and a cross-linking agent, but may also contain known additives. The additive is not particularly limited, but is a filler, a colorant, a diluent, a viscous adhesive, a thickener, a dispersant, an antifoaming agent, a preservative, an antifungal agent, an algae-proofing agent, and an ultraviolet absorber. , Light stabilizer, heat stabilizer, antioxidant and the like.

Among these, examples of the antioxidant include phosphorus-based, sulfur-based, and hindered-type phenol-based antioxidants. These can be used alone or in combination of two or more. By including such an antioxidant, deterioration of the synthetic resin can be suppressed not only in normal times but also when the temperature rises due to a fire or the like, and excellent heat resistance can be exhibited.

Examples of the heat stabilizer include metal soap-based heat stabilizers such as calcium, barium, and zinc. These can be used alone or in combination of two or more. By including such a heat stabilizer, the crosslinkability of the adhesive is improved, whereby the adhesiveness with the heat-foamable sheet is enhanced, and excellent heat resistance can be exhibited.

The heat-foaming layer of the long member is not particularly limited as long as it foams as the temperature rises (preferably 200 ° C. or higher, more preferably 250 ° C. or higher) to form a carbonized layer. A sheet-like sheet containing the same constituents as the effervescent sheet is preferable. The thickness of the heat foam layer is preferably 0.2 mm or more and 10 mm or less, and more preferably 0.5 mm or more and 6 mm or less.

The long member [FIG. 1] of the present invention is a laminated body of the adhesive layer and the heat-foaming layer, and is a strip-shaped long body in which the adhesive layer of the adhesive is laminated on one surface of the heat-foaming layer. Further, the surface of the adhesive layer can be covered with a release sheet. By forming such a laminated body, it can be easily attached and the work efficiency is improved.

The releasable sheet protects the adhesive layer during storage or transportation of the long member of the present invention, and can be easily peeled off from the adhesive layer when the long member is used. As such a releasable sheet, a known one can be used without particular limitation. Examples thereof include paper or film coated or impregnated with a mold release agent such as silicon, wax or fluororesin, or a synthetic resin film such as polypropylene or polyethylene which does not contain the mold release agent and has a mold release property itself.

The width of the long member (FIG. 1: W ₁ ) may be appropriately set, but is preferably 10 mm to 200 mm (more preferably 15 mm to 150 mm). Further, the length (FIG. 1: L ₁ ) may be appropriately set according to the coating method, but is preferably 10 m or more (more preferably 20 m to 30 m), and the laminated body is required as a wound body. It can also be cut according to the length and used.

The method for manufacturing the long member (laminated body) is not particularly limited, but a method of applying an adhesive to one surface of the heat foam layer and laminating a releasable sheet on the adhesive, or a method of laminating a releasable sheet on the releasable sheet. A method of applying an adhesive to the surface and laminating a heat foam layer on the adhesive can be mentioned. In the above method, when the adhesive is applied and each heat foam layer is laminated on the adhesive, it may be laminated as it is (as it is undried) or after it is dried. The amount of the adhesive used in this case is not particularly limited, but may be about 25 g / m ² or more and 300 g / m ² or less. Further, the long member (laminated body) of the present invention may be a wound body in which the long member is wound in a spiral shape. In the case of a wound body, the outer layer may be either a heat-foamable sheet or a releasable sheet, but it is preferable to wind the releasable sheet so as to be on the outer side. Such a wound body can be cut and used according to a required length, and at the time of construction, the laminated body is unwound from the wound body, the releasable sheet is peeled off to expose the adhesive layer, and the adhesive layer is exposed. Can be used by sticking it toward the base material side. At this time, crimping or the like can be performed as needed.

<Coating method>
The coating method using the heat-foamable sheet of the present invention
for example,
(1) A step of coating a base material with one or more heat-foamable sheets.
(2) A long member for one or more joints selected from the boundary between the base material and the end of the heat-foamable sheet, the abutting part between the heat-foamable sheets, or the overlapping part between the heat-foamable sheets. The process of pasting,
Is included.

In the step (1) above, as a method of coating the base material with a heat-foamable sheet, for example, a known adhesive (adhesive) or a fixing member (welding pin, tacker, stapler, etc.) may be used. can. Further, as an embodiment in which the base material is coated with the heat-foamable sheet, for example, the base material is directly (adhesively) coated with an adhesive (adhesive) as needed (FIG. 2). , An embodiment covered with an air layer (FIG. 4) and the like.

Specifically, FIG. 2 shows an embodiment in which a heat-foamable sheet 2 is directly (adheredly) coated on a square steel frame 31 via an adhesive 21. Further, FIG. 3 is a cross-sectional view of FIG. 2, showing an aspect of the mating portion A, and as shown in FIG. 3 (I), the end portion of the heat-foamable sheet 2 is covered so as to have a butt portion A1. It is a thing. Further, as shown in FIG. 3 (II), the end portion of the heat-foamable sheet 2 may be coated so as to have an overlapping portion (A2).
FIG. 4 shows an embodiment in which a heat-foamable sheet 2 is covered with an air layer on an H-type steel frame 32, and an end portion of the heat-foamable sheet is fixed to the H-type steel frame 32 with a fixing member 22. Further, FIG. 5 shows an aspect of the mating portion A of FIG. 4, in which the end portion of the heat-foamable sheet 2 is coated so as to have the butt portion A1 in the longitudinal direction as shown in FIG. 5 (I). be. Further, as shown in FIG. 5 (II), the end portion of the heat-foamable sheet 2 may be coated so as to have the overlapping portion A2. Further, in the aspect of FIG. 4, as the connecting portion A, the boundary portion A3 between the base material 33 and the heat-foamable sheet 2 can also be mentioned.

In the step (2) above, the long member 1 is attached to one or more types (locations) of the joint portions A (A1 to A3) of the covering structure covered with the above (1). Specifically, the boundary portion between the base material 3 and the end portion of the heat-foamable sheet 2 (FIG. 4; A3), the butt portion between the heat-foamable sheets 2 (FIG. 3; A1, FIG. 5; A1), or the heat-foamable property. The long member 1 is attached to the connecting portion selected from the overlapping portions (FIG. 3; A2, FIG. 5; A2) of the sheets 2. In this case, it is preferable to attach the long member 1 so as to straddle the connecting portion A. When there are a plurality of joints A, a long member may be attached to at least one joint, and long members may be provided to all the joints, depending on the desired heat resistance. Further, the long member 1 may be attached to at least a part of the connecting portion A, but it is preferable to attach the long member 1 to the entire connecting portion A. When a laminate in which the releasable sheet 13, the adhesive 12, and the heat-foamable layer 11 are laminated is used as the long member 1, the releasable sheet 13 can be peeled off and attached to the joint portion. Often, crimping or the like can be performed as needed.

FIG. 6 shows an example of the covering structure obtained by the covering method including the above (1) and (2). The coating structure obtained in the present invention can exhibit excellent heat-resistant protection performance.

Hereinafter, examples will be shown to further clarify the features of the present invention.

<Manufacturing of heat-foamable sheet>
A raw material mixture containing 100 parts by weight of ethylene-vinyl acetate resin, 75 parts by weight of melamine, 75 parts by weight of dipentaerythritol, 370 parts by weight of ammonium polyphosphate and 105 parts by weight of titanium oxide is sufficiently kneaded using a kneader and then extruded. It was processed into a sheet by a machine to produce a heat-foamable sheet having a thickness of 1 mm.

<Manufacturing of long members>
(Manufacturing of adhesive)
According to the formulation shown in Table 1, each raw material was mixed by a conventional method and used as an adhesive 1-7.
The following raw materials were used.
-Hydroxy group-containing acrylic resin (solid content 54% by weight, ethyl acetate, containing aromatic hydrocarbon solvent)
-Fluororesin: Hydroxyl-containing fluororesin (chlorotrifluoroethylene-vinyl ether-hydroxyalkyl vinyl ether, hydroxyl value 52 mgKOH / g, solid content 60% by weight, containing aromatic hydrocarbon solvent)
-Crosslinking agent: Isocyanate compound (tolylene diisocyanate compound, solid content 45% by weight, ethyl acetate solvent)
・ Solvent: Ethyl acetate ・ Additives: Plasticizers, antioxidants, heat stabilizers, catalysts

(Manufacturing of long member 1)
Adhesive 1 was applied to one surface of the heat-foamable sheet at 100 g / m ² and dried at 23 ° C. for 3 hours. After that, a member cut into a size of 30 mm in width and 10 m in length was used as a long member 1.
(Manufacturing of long members 2 to 7)
The long members 2 to 6 were manufactured in the same manner as the long member 1 except that the adhesives 2 to 7 were used respectively.

(Example 1)
As shown in FIG. 4, an H-shaped steel frame 32 (H400 × 200 × 8 × 13 mm, length 1200 mm) is installed on the structural material 33 (floor plate: ALC plate), and one end of the produced heat-foamable sheet 2 is fixed. It is fixed by the member 22, further wrapped around the H-shaped steel frame 32 so as to be covered by the heat-foamable sheet 2, and the other end of the heat-foamable sheet 2 is also fixed by the fixing member 22 in the same manner. The heat-foamable sheet 2 was coated around the mold steel frame 32 via an air layer. As shown in FIG. 5 (I), a plurality of heat-foamable sheets 2 were butt-coated. Next, a test piece in which the long member 1 was attached to the connecting portions A1 and A3 of the heat-foamable sheet 2 was used as a test body [FIG. 6 (II)].

After curing the prepared test piece for 24 hours, the adhesiveness (evaluation 1) of the long member 1 attached to the joint portion of the heat-foamable sheet 2 was evaluated. The evaluation criteria are as follows. The results are shown in Table 2.
A: No peeling or falling off B: Slightly turned over, but no falling off C: Partially peeled off D: Dropped off

The prepared test piece was subjected to a heating test for 1 hour according to the standard heating curve of ISO834, and the state of the long member (evaluation 2) and the heat resistance protection (evaluation 3) were evaluated. Each evaluation standard is as follows. The results are shown in Table 2.
(Evaluation 2) State of long member A: No peeling or falling off, forming a good carbonized heat insulating layer B: Slightly turning up, but no falling off, forming a good carbonized heat insulating layer C: Partially peeling off, falling off D: Dropping (evaluation 3) Heat-resistant protection (expansion ratio of heat-foamable sheet)
A: Foaming ratio over 30 times B: Foaming ratio over 20 times and 30 times or less C: Foaming ratio over 10 times and over 30 times D: Foaming ratio 10 times or less (steel frame (steel material) temperature)
A: Less than 470 ° C B: 470 ° C or more and less than 500 ° C C: 500 ° C or more and less than 550 ° C D: 550 ° C or more

(Example 2)
In Example 1, a test piece was prepared in the same manner as in Test Example 1 except that the heat-foamable sheets were coated so as to have an overlapping portion (the overlap width between the heat-foamable sheets was 20 mm), and the same evaluation was performed. gone. As a result, the long member did not peel off, fall off, etc., and formed a good carbonized heat insulating layer, and further, the carbonized heat insulating layer of the heat-foamable sheet did not fall off, and a substantially uniform carbonized heat insulating layer was formed, which was good. Showed excellent heat resistance.

(Examples 3 to 6, Comparative Example 1)
A test body was prepared by the same method as in Example 1 except that the long member shown in Table 2 was used, and the same evaluation was performed. The evaluation is shown in Table 2.

Claims (2)

It is a coating method using a heat-foamable sheet.
After coating the substrate with one or more heat-foamable sheets,
A long member is attached to one or more joint portions selected from the boundary portion between the base material and the end portion of the heat-foamable sheet, the abutting portion between the heat-foamable sheets, or the overlapping portion between the heat-foamable sheets. It ’s something to wear,
The long member is a laminated body in which an adhesive layer and a heat foam layer forming a carbonized heat insulating layer due to temperature rise are laminated.
The adhesive layer contains a synthetic resin and a cross-linking agent.
A coating method characterized by the synthetic resin containing a hydroxyl group-containing acrylic resin and a fluororesin. The coating method according to claim 1, wherein the synthetic resin contains a hydroxyl group-containing acrylic resin and a hydroxyl group-containing fluororesin.

Images