JPH09256506A - Wood fireproof coating method and fireproof wood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate and ensure the execution of works by installing a foamed fire-resisting sheet, in which a foamed fire-resisting layer is laminated on the surface of a bendable support sheet, so that the support sheet side is faced to wood. SOLUTION: A sheet, etc., made of a bendable flame-retardant or noncombustible metal or alloy are used as a support sheet. Since a foamed fire-resisting layer is formed and carbonized by the generation of a fire, etc., and displays heat-insulating and fire-extinguishing effects, a material capable of being formed of a known paint composition called foamed fire-resisting paints and being mainly composed of the components of six kinds of a binder, a flame retardant, a foaming agent, a carbonizing agent, fillers and a solvent is employed. When foamed sheets are installed onto wood, the support sheet side is wound on wood so as to be faced to wood, the terminal sections of the foamed sheets are superposed, and the superposing sections are riveted and mounted. Accordingly, no coating process and impregnating process is required, and the execution of works can be facilitated.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fireproof coating method for wood and a fireproof coated wood.

[0002]

2. Description of the Related Art In recent years, due to the relaxation of building regulations, the standards for fireproof structures have been extensively reviewed. As a result, wooden buildings are also recognized as fireproof structures if they meet certain conditions.

In the case of a wooden building, it is necessary to carry out a "burning margin design" in order to secure a predetermined fire resistance performance, especially the pillars and beams among the structural parts thereof. This delays or prevents a decrease in structural strength due to combustion of wood during a fire due to an increase in the cross-sectional size of the wood. In addition, laminated wood is generally used as wood for pillars / beams having a large wooden cross section, which is designed to have fire resistance by performing such a burning allowance design. However, if the burning margin is designed, it is inevitable that the pillars, beams, and the like must be made thick, and the cost increase of materials cannot be avoided.

On the other hand, as a method for preventing or delaying the burning of wood, the following measures have been conventionally proposed. Method of applying or impregnating inorganic flame retardant liquid agent (fireproof paint, fireproof paint) Method of applying coating material (fireproof liquid, foam fireproof paint) that foams and insulates by heat in case of fire Gypsum board, calcium silicate A method of sticking a fireproof and fireproof board such as a board to the surface of wood.

The above-mentioned technique is based on an inorganic flame retardant agent,
For example, boric acid, borax, silicate, etc. are melted by heat to form a film, which protects the material from a flame.

In the above, sugars, amino resins, etc. contained in the fireproofing chemical solution or the foamed fireproof paint are decomposed by heat and foamed to form a heat insulating film.

The above are: a) non-combustible materials such as gypsum board and calcium silicate board that do not generate heat by themselves and cut off heat from the outside; b) good conductors of heat such as iron boards and aluminum foil. , There are those that do not transfer to the underlying wood by radiating heat from the outside, and c) those that reflect heat rays with a glossy metal plate such as an aluminum plate.

However, each of these conventional methods has problems. Although the above-mentioned flame retardant is effective in terms of fireproof performance of making it difficult to burn when exposed to heat, it is extremely difficult to provide a fireproof structure capable of withstanding at a high temperature of about 1000 ° C.

In the method of applying the foamed refractory paint, the effect of maintaining the fireproof performance itself can be expected. However, in the construction, it is necessary to repeat the process of applying the coating material and drying it several times, which is a difficult point in practice because it takes a lot of time and labor.

In the method of providing the above-mentioned inorganic board, the fire protection layer must be thick as a result.

[0011]

SUMMARY OF THE INVENTION Accordingly, the main object of the present invention is to perform fireproof coating of wood relatively easily and reliably.

[0012]

In order to solve the above problems of the prior art, the present inventor has conducted extensive studies, and as a result, when a specific foamed refractory sheet is used, it is also excellent in fire resistance for wood. They have found that they can provide performance, and have completed the present invention.

That is, the present invention is a method for providing a foamed fire-resistant sheet having a foamed fire-resistant layer laminated on the surface of a bendable support sheet on wood, wherein the support sheet side is provided so as to face the wood. The present invention relates to a wood fireproof coating method.

Furthermore, the present invention relates to a fire-resistant coated wood, in which a foam fire-resistant sheet having a flexible fire-resistant layer laminated on the surface of a flexible support sheet is provided so that the support sheet side faces the wood.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail along with its embodiments.

The foamed refractory sheet according to the present invention comprises a foamed refractory layer laminated on the surface of a flexible support sheet.

The support sheet is not particularly limited as long as it can be bent, but it is preferably flame-retardant or non-flammable.

The thickness of the support sheet is not particularly limited as long as it has the above-mentioned flexibility, but is usually about 20 μm to 10 mm, preferably 40 μm to 5 mm. If the thickness of the support sheet is too thin, fixation with nails becomes insufficient, and the entire refractory sheet may peel off during a long period of time.
On the other hand, if it is too thick, the foamed refractory sheet itself becomes difficult to bend, which may hinder the construction.

The material of the support sheet is not particularly limited, and examples thereof include synthetic resin sheets, metal sheets, alloy sheets, organic or inorganic fiber sheets, organic or inorganic mesh sheets, and various non-woven fabrics.

In particular, when a metal or alloy sheet is used, a product produced by rolling a metal or alloy such as aluminum, stainless steel, copper or iron, metal or alloy foil laminated paper, metal vapor deposition laminated paper, etc. preferable. In particular, because of their high thermal conductivity, the heat generated by a fire can be immediately diffused, so that the local foaming reaction of the foamed refractory sheet is controlled, and the foaming reaction proceeds uniformly throughout the sheet. Can be made.

In the present invention, by impregnating the support sheet with various known additives, for example, the effect of the additive permeation into wood can be obtained. Examples of such additives include wood preservatives and insect repellents against pests that enter wood. As preservatives,
For example, known ones such as creosote oil, pentachlorophenol laurate, tributyltin oxide, tributyltin malate, copper naphthenate, trichloronaphthalene and the like can be used. Examples of insect repellents include DDT, chlordane, dieldrin, sodium arsenate, lead fluoride,
Known substances such as boric acid, carbon disulfide, carbon tetrachloride and methyl bromide can be used.

On the other hand, the foamed refractory layer is foamed and carbonized by the occurrence of a fire or the like to exert a heat insulating / fire extinguishing effect. When the foamed refractory layer according to the present invention is used by bending and winding together with the support sheet, it is desirable that the foamed refractory layer has at least the same degree of flexibility as the support sheet. Flexibility may be appropriately set according to the shape of the wood, etc., but is generally not particularly limited as long as it does not cause cracks even if the diameter of the mandrel is 10 mm in JIS K 5400 8.1 “Flex resistance test”. Not something.

Such a foamed fireproof layer can be formed, for example, by a known coating composition called a foamed fireproof coating. The foamed fire-resistant paint is mainly composed of, for example, a binder, a flame retardant, a foaming agent, a carbonizing agent, a filler and a solvent.
It is possible to use those composed of different types of components.

The binder is a main element for forming a film when it is not foaming, and constitutes a part of the carbonized heat insulating layer by a complex reaction with various components contained in the film when a fire occurs.

The binder can be mixed with other components and is not particularly limited as long as it forms a film.
For example, acrylic resin, urethane resin, epoxy resin,
Synthetic resin such as vinyl resin, phenol resin, silicone resin, chlorinated rubber, alkyd resin, polyester resin,
Alternatively, a natural resin such as shellac or rosin can be used. These may be used alone or in combination of two or more. It should be noted that these usage forms can be any form such as varnish, latex, emulsion and the like.

In the present invention, in particular, 1) one-component curing type epoxy resin, styrene-butadiene copolymer resin, styrene-
Acrylic ester copolymers, vinyltoluene-butadiene copolymers and vinyltoluene-acrylic ester copolymers, and 2) from at least one of terpolymers containing these and acrylic acid monomers and / or methacrylic acid monomers. Selected and weight average molecular weight 5000
It is preferably about 0 to 200,000 from the viewpoint of the strength of the carbonized heat insulating layer, the expansion ratio, the uniformity of foaming, and the like.

The one-pack type epoxy resin is, for example, a bisphenol A type, a bisphenol F type, a novolac type, a resorcin type, a cyclic ester type, an aliphatic ester type, or the like, and has thermoplasticity.

Examples of the above-mentioned monomer include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and n-.
Butyl acrylate, n-butyl methacrylate, 2-
Examples thereof include hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, acrylamide, glycidyl acrylate, and glycidyl methacrylate.

The flame retardant prevents the binder from burning when a fire occurs due to the dehydration cooling effect, the nonflammable gas generating effect, the binder carbonization promoting effect and the like. For example, tricresyl phosphate, diphenyl cresyl phosphate, diphenyl octyl phosphate, tri (β-chloroethyl) phosphate, tributyl phosphate, tri (dichloropropyl) phosphate, triphenyl phosphate, tri (dibromopropyl) phosphate, chlorophosphonate, bromophosphonate ,
Organic phosphorus compounds such as diethyl-N, N-bis (2-hydroxyethyl) aminomethylphosphate, di (polyoxyethylene) hydroxymethylphosphonate, chlorinated paraffin, chlorinated polyphenyl, chlorinated polyethylene, diphenyl chloride Chlorinated compounds such as triphenyl chloride, pentachloro fatty acid ester, perchloropentacyclodecane, chlorinated naphthalene, and tetrachlorophthalic anhydride,
Inorganic compounds such as antimony trioxide, antimony pentachloride, phosphorus trichloride, phosphorus pentachloride, ammonium phosphate, ammonium polyphosphate, zinc borate, sodium borate and the like can be mentioned. In particular, ammonium polyphosphate has both a dehydration cooling effect and an incombustible gas generating effect, and thus has a high flame retardant effect, and can reduce the blending amount of the foaming agent.

The foaming agent is a component which mainly foams a binder and a carbonizing agent (which will be described later) which are carbonized by a fire by generating a non-combustible gas to form a carbonized heat insulating layer containing pores. For example, melamine and its derivatives, dicyandiamide and its derivatives, azodicarbonamide, urea,
Thiourea etc. are mentioned. In particular, melamine, dicyandiamide, and azodicarbonamide are excellent in the generation efficiency of nonflammable gas.

The carbonizing agent is a component for forming a thick carbonized heat insulating layer having excellent heat insulating properties by itself dehydrating and carbonizing together with carbonization of the binder due to fire. Examples thereof include polyhydric alcohols such as starch, casein, pentaerythritol, dipentaerythritol, and trimethylolpropane. Of these, dipentaerythritol is particularly excellent in the dehydration cooling effect and the formation of the carbonized heat insulating layer.

The filler is a component that mainly imparts the strength-imparting effect of the carbonized heat insulating layer and the effect of improving fire resistance. Examples thereof include silicates such as talc, carbonates such as calcium carbonate and sodium carbonate, metal oxides such as aluminum oxide, titanium dioxide and zinc oxide, and clay, clay, shirasu and mica.

The solvent is blended mainly for adjusting the viscosity of the fire-resistant coating composition, adjusting the drying property and adjusting the workability. The type is not particularly limited as long as it does not react with each component of the foamed fireproof coating. For example, when the binder is a solvent-based varnish, an aromatic solvent such as toluene and xylene, an aliphatic solvent such as a ketone, a glycol ester, and a mineral spirit can be used. Water is used when the binder is an aqueous emulsion or latex.

The blending ratio of each of these components can be appropriately determined depending on the use site, thickness, etc. of the product, but usually 200 to 100 parts by weight of the binder in terms of solid content (excluding solvent) is used as the flame retardant. 600 parts by weight, foaming agent 40-
150 parts by weight, carbonizing agent 40 to 150 parts by weight, filler 50
Up to 160 parts by weight and 100 to 300 parts by weight of solvent.

Further, it is desirable to add a plasticizer to the foamed fireproof coating composition. This makes it easier for the foamed refractory layer to follow the bending of the support sheet.

Examples of the plasticizer include phthalic acid ester compounds such as di-2-ethylhexyl phthalate, diisononyl phthalate and dibutyl phthalate, and tri-n-.
Octyl trimellitate, dipentaerythritol ester, trimellitic acid ester compounds such as mixed alcohol trimellitate, fatty acid ester compounds such as butyl oleate, epoxidized soybean oil, epoxidized linseed oil, epoxidized fatty acid alkyl ester, etc. Epoxy compounds, adipic ester compounds such as isobutyl adipate, di-2-ethylhexadipate, etc., tricresyl phosphate, tri-2-ethylhexyl phosphate, triphenyl phosphate, 2-ethylhexyl diphenyl phosphate, cresyl diphenyl Examples thereof include phosphate compounds such as phosphates, stearic acid compounds, and other compounds such as process oil, chlorinated paraffin, and polybutene. The plasticizers may be used alone or in combination of two or more. The addition amount of the plasticizer may be usually about 2 to 30 parts by weight with respect to 100 parts by weight of the foamed refractory paint.

On the other hand, the foamed refractory layer in the present invention can also be formed from a composite refractory coating composition containing a petroleum resin. As the composition, for example, a composition comprising a vinyl-based thermoplastic synthetic resin, a petroleum resin, a phosphorus-based flame retardant, a foaming agent, a carbonizing agent and a chlorine-based plasticizer can be used.

Examples of the vinyl-based thermoplastic synthetic resin include polyvinyl chloride, polyethylene, ethylene-vinyl acetate synthetic resin, vinyl acetate-veova synthetic resin, vinyltoluene butadiene, vinyltoluene acrylate and vinyltoluene methacrylate.

The petroleum resin is, for example, C out of the cracked oil fraction produced as a by-product from an ethylene plant for producing ethylene, propylene and the like by steam cracking of petroleum.
Aliphatic (C5) petroleum resin made from 5 fractions, C9
Aromatic (C9) petroleum resin made from fractions, aliphatic / aromatic copolymerization (C5C9) petroleum resin made from both materials, and alicyclic system made from high-purity dicyclopentadiene (DCPD type) petroleum resins, synthetic polyterpenes, and hydrogenated products thereof. In particular, among these petroleum resins, hydrogenated resins having no or few saturated bonds are desirable because they are excellent in weather resistance and have a colorless hue.

As the phosphorus-based flame retardant, a phosphorus-based compound among the flame retardants listed above can be used.

Examples of the foaming agent include melamine compounds such as melamine, triazine compounds such as trihydrazinotriazine, dinitrosopentamethylenetetramine, N such as N, N-dinitroso-N, N-dimethylterephthalamide.
-Nitroso compounds, azo compounds such as azobisisobutyronitrile, azodicarponamide, benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, p,
Examples thereof include sulfone hydrazide compounds such as p-oxy-bis (benzenesulfonyl hydrazide), and derivatives thereof.

As the carbonizing agent, the same carbonizing agents as described above can be used.

As the chlorine-based plasticizer, a chlorine-based compound among the plasticizers listed above can be used.

The blending ratio of these can be appropriately determined depending on the type of wood, the part to be used, etc., but usually 1 part of the petroleum resin is added to 100 parts by weight of the vinyl thermoplastic synthetic resin.
0 to 60 parts by weight, phosphorus flame retardant 200 to 600 parts by weight,
The foaming agent may be 40 to 120 parts by weight, the carbonizing agent may be 40 to 120 parts by weight, and the chlorine-based plasticizer may be 50 to 170 parts by weight.

When a composite fireproof coating composition containing a petroleum resin is used, an overcoat material can be further formed on the coating layer formed from the composition. As the top coat material, for example, one containing silicon-modified acrylic resin, fluorourethane resin or the like as a main component can be used.

On the other hand, as the foamed refractory layer in the present invention,
A refractory sheet obtained by melting and molding a fireproof sheet material containing a petroleum resin, a fireproofing powder and a toughness imparting agent can also be used.

As the petroleum resin, the same ones as listed above can be used. When the above refractory sheet is used, these petroleum resins are usually solid pellets, so they are melted and used in a fluid state at the time of use. The softening temperature of the petroleum resin is not particularly limited as long as it is lower than the reaction temperature of the other constituent components, but since the reaction temperature of the other constituent components is generally about 200 ° C., a temperature lower than that is desirable. Further, depending on the part where the foamed refractory sheet is used, temperature rise due to sunlight or the like is expected, and it is required that melting or liquefaction does not occur even in such a situation. Therefore, the lower limit is preferably about 70 ° C.

The melt viscosity of the petroleum resin is such that most of the petroleum resin can uniformly mix the other constituent components because the molecular weight of the petroleum resin is about one thousand and several hundreds. In order to improve the fire resistance performance by making it larger, it is necessary to add a large amount of other constituent components, and in consideration of such a case, it is desirable that it is about 0.03 to 2 Pa · S at 200 ° C.

As the fire resistance imparting powder, one containing a flame retardant, a carbonizing agent, a filler and a foaming agent can be used. As the flame retardant, carbonizing agent, filler and foaming agent, those exemplified above as the flame retardant, carbonizing agent, filler and foaming agent can be used as they are.

The toughness imparting agent is particularly for increasing the energy required for breaking the coating film. For example, Gee 2
-Phthalate ester compounds such as ethylhexyl phthalate, diisononyl phthalate, dibutyl phthalate, trimet acid ester compounds such as tri-n-trioctyl trimellitate, dipentaerythritol ester, mixed alcohol trimellitate, butyl oleate, etc. Fatty acid ester compounds, epoxidized soybean oil, epoxidized linseed oil, epoxy compounds such as epoxidized fatty acid alkyl ester, isobutyl adipate, Gee2
-Adipic ester compounds such as ethylhexyl adipate, tricresyl phosphate, tree 2-ethylhexyl phosphate, triphenyl phosphate, 2
-Phosphate compounds such as ethylhexyl diphenyl phosphate and cresyl diphenyl phosphate, mineral oils such as aroma process oils and naphthene process oils, chlorinated compounds such as chlorinated paraffins and chlorinated aliphatic esters, polybutene, polybutadiene, etc. Examples thereof include resins such as polymer oil, alkyd resin, and xylene resin.

The blending ratio of these can be appropriately determined depending on the type of wood, the part to be used, etc., but normally 50 parts by weight to 600 parts by weight of the fireproofing powder is added to 100 parts by weight of the petroleum resin.
The amount may be 5 parts by weight and the toughness imparting agent may be 5 to 150 parts by weight.
In addition, in the fire resistance imparting powder, the flame retardant 30 to 30 is usually used.
Those containing 85% by weight, a carbonizing agent of 4 to 35% by weight, a filler of 5 to 40% by weight and a foaming agent of 4 to 35% by weight can be used.

In the present invention, the foamed refractory sheet may be blended with other additives within a range that does not impair the fire resistance and the like. For example, fibers may be mixed for reinforcement and pigments may be mixed for coloring. As the fiber, for example, rock wool, glass fiber, inorganic fiber such as silica-alumina fiber,
Organic fibers such as pulp may be used alone or in combination. As the pigment, general pigments for paints such as titanium dioxide, iron oxide, zinc oxide and the like can be used.

As a method for providing the foamed refractory sheet on the support sheet, any method may be adopted as long as the fireproof performance is not reduced. For example, it may be manufactured by applying a foamed fireproof coating composition or the like on the surface of the supporting sheet and drying it, or by separately using a sheet-like material obtained from the foamed fireproof coating composition or the like by various bonding means / joining means. It may be provided on the support sheet. Examples of the adhesive include acrylic adhesives and the like.

The foamed refractory sheet of the present invention is provided with the support sheet surface facing wood such as columns and beams. That is, the foamed refractory layer is provided toward the side exposed to flames and the like. When the support sheet surface is directed to the wood, it is possible to directly contact the support sheet surface with the wood, or to provide a gap between the two.

The foamed refractory sheet can be provided on all or part of the wood. When it is provided on the whole of the timber, for example, when the timber is a round material, it is fit to the outer shape of the timber, and when it is a timber, it is bent at the corner, and the end portions are overlapped, and the overlapped portion is tacked or the like. Fixed by. It is also possible to fix the end portions by abutting and fixing each other without overlapping, and put the joint portion together with putty, a fireproof sheet piece (ribbon) containing the petroleum resin, or the like. When the foamed refractory sheet is provided on wood, it may be fixed at an arbitrary portion with tacks or the like.

As the tacks used for fixing the foamed fire-resistant sheet, known ones can be used and, for example, nails, screws, staples and the like that can physically fix the sheet to wood can be used.

When the sheet of the present invention is provided on a part of the wood, the sheet of the present invention may be appropriately provided so as to particularly protect a portion that is easily exposed to the flame or a portion that is relatively weak to the flame. When the wood is a lumber, for example, at least one corner of the lumber may be covered with the sheet of the present invention. Further, when the wood is a round material, for example, at least one side surface thereof may be covered with the sheet of the present invention.

Preferably, in the case where the wood is a lumber (having a quadrangular cross section), 4 on the diagonal line in the cross section.
One corner may be partially covered with the sheet of the present invention. Also, when the wood is a round material, for example, four side surfaces consisting of one set of side surfaces facing each other at the center of the cross section of the round material and another set of side surfaces forming a straight line orthogonal to the straight line connecting the set on the cross section. The sheet of the present invention is provided in. By such partial coating, it is possible to effectively use the characteristics of wood (such as hygroscopicity) while suppressing or preventing a sharp decrease in the structural strength of wood during combustion or the like.

In the present invention, the type of wood to which the fireproof coating is applied is not particularly limited and includes not only general wood but also various plywoods, fiber boards and the like. There is no particular limitation on the part to be used, and it can be appropriately used not only for columns, beams and the like, but also for other parts (body, eaves, base, etc.).

[0060]

According to the present invention, the following effects can be obtained, for example.

(1) Since excellent fire resistance can be imparted to wood, for example, the thickness of wood used can be minimized, which is extremely advantageous in terms of design and cost.

(2) Since the fireproof coating layer has excellent flexibility, it can be applied to wood of any shape.

(3) When a strong support sheet is used, conventional tacking such as screws, nails and tackers can be applied as it is, and an adhesive agent is not particularly required.

(4) Unlike the coating method and impregnation method using a flame retardant, a fire-resistant paint, etc., the coating process and the drying process are not required, and the work can be performed in a short time.

[0065]

The following examples are provided to further clarify the features of the present invention.

Example 1 First, a coating material having the following blending ratio was prepared.

Vinyl-based synthetic resin 100 parts by weight Ammonium polyphosphate 400 parts by weight Pentaerythritol 70 parts by weight Melamine powder 70 parts by weight Titanium dioxide 95 parts by weight Diluting solvent (xylene) 200 parts by weight The above materials are 50 μm thick and 350 mm wide. , Length 150
A thin plate made of 0 mm stainless steel is coated uniformly with an applicator at a coating amount of about 2 kg / m ² and then 2 at 60 ° C.
After being dried for 4 hours, a foamed fireproof sheet having a coating film having a thickness of about 1 mm was obtained. When this sheet was tested with a mandrel having a diameter of 10 mm based on JIS K 5400 8.1 "Flex resistance test", cracks and the like did not occur in the coating layer.

On the other hand, the cross section of the base wood is 150 mm.
A laminated wood member having a corner of × 150 mm and a length of 1.5 m was prepared.
The refractory sheet was attached to this laminated member in such a manner that the stainless steel thin plate serving as the support sheet was placed on the wood side and the surface was covered with two sheets. The attachment was done by a tucker.
In addition, the seams of the two fireproof sheets should be overlapped,
That part was also attached by a tacker.

Using the above-mentioned fireproof sheet-coated wood and uncoated wood, standard heating as specified in Table 4 of the section "4. Heating grade" of JIS A 1304 "Fireproof test method for building structural members" and Appendix 1 A 45-minute heating test was performed based on the curve.

As a result, the uncoated laminated material began to burn from the surface after the start of the heating test and continued to burn during the test. When the fire was extinguished immediately after the test and the cross section was cut, the cross-sectional area of the part that had not been carbonized was approximately 3 times the original cross-sectional area.
It was burning until it reached 0%.

On the other hand, in the test piece of the laminated wood covered with the refractory sheet, the refractory sheet layer on the surface started foaming after the start of heating, and the foamed layer did not fall off over almost the entire surface until the end of the heating test. I was holding. Furthermore, when the cover sheet was peeled off, the wood surface was partially burned and carbonized, but when cut and the cross section was observed, the unburned cross-sectional area was about 58%. It was confirmed to be effective in maintaining strength.

Example 2 First, a material having the following blending ratio and a coating property was prepared.

Petroleum resin 100 parts by weight (aromatic softening point 100 ° C.) di-2-ethylhexyl phthalate 40 parts by weight ammonium polyphosphate 120 parts by weight pentaerythritol 25 parts by weight melamine powder 30 parts by weight titanium dioxide 25 parts by weight A uniform paste-like fluid was obtained by mixing and stirring in a heating container set at 150 ° C. The heated paste is extruded while being cooled through a release sheet with a cooling roll having a width of 300 mm and a gap of 1.5 mm, and a width of 30 mm.
A 0 mm sheet was obtained.

This sheet has a thickness of 100 μm and a width of 350 m
An acrylic resin adhesive was applied to and bonded to a thin aluminum plate having a length of m and a length of 1500 mm to obtain a foamed fire-resistant sheet having a coating film having a thickness of about 1.6 mm. This sheet is JIS
According to K 5400 8.1 "Flex resistance test", the diameter of the mandrel is 1
When the test was carried out with a film having a thickness of 0 mm, cracks and the like did not occur in the coating film layer.

On the other hand, the cross section of the base wood is 150 mm.
A laminated wood member having a corner of × 150 mm and a length of 1.5 m was prepared.
The refractory sheet was attached to this laminated member in such a manner that the aluminum thin plate serving as the support sheet was placed on the wood side and the surface was covered with two sheets. The mounting was done with screws. In addition, the joints of the two fireproof sheets were butted, and the joint portion was formed by cutting a sheet having the same composition as the coating layer into a ribbon shape and pressing it while gently heating it to close the joint.

Using the above-mentioned fireproof sheet coated wood and uncoated wood, the standard heating specified in Table 4 of the section “4. Heating grade” of JIS A 1304 “Fireproof test method for building structural members” and Appendix 1 A 1-hour heating test was performed based on the curve.

As a result, the uncoated laminated material began to burn from the surface after the start of the heating test and continued to burn during the test. When the fire was extinguished immediately after the test and the cross section was cut, the cross-sectional area of the part that had not been carbonized was about 1 of the original cross-sectional area.
It was burning up to 5%.

On the other hand, in the test piece of the laminated wood covered with the refractory sheet, the refractory sheet layer on the surface started foaming after the start of heating, and the foamed layer did not fall off over almost the entire surface until the end of the heating test. I was holding. Further, when the cover sheet was peeled off, the wood surface was partially burned and carbonized, but when cut and the cross section was observed, the unburned cross-sectional area was about 62%. It was confirmed to be effective in maintaining strength.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state in which a laminated laminated material is covered with a foamed refractory sheet in Example 1.

FIG. 2 is a schematic view showing a state in which a laminated lumber is covered with a foam refractory sheet in Example 2.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideo Motoki 1-25-10 Shimizu, Ibaraki-shi, Osaka SK Research Institute, Inc. (72) Inventor Tomio Ouchi 2-chome, Hibita, Chofu-shi, Tokyo 19 No. 1 in Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Keiichi Miyamoto No. 19-1 Tobita-ryu, Chofu City, Tokyo Kashima Construction Co., Ltd. Technical Research Institute

Claims (13)

[Claims] 1. A method for providing a foam fire-resistant sheet, in which a foam fire-resistant layer is laminated on a surface of a flexible support sheet, on wood, wherein the support sheet side is provided so as to face the wood. . 2. When providing a foamed refractory sheet on wood,
The fire-resistant coating method according to claim 1, wherein the foamed fire-resistant sheet is wrapped around wood, the end portions of the foamed fire-resistant sheet are overlapped with each other, and tacking is performed at the overlapped portion. 3. When providing a foam fireproof sheet on wood,
The fireproof coating method according to claim 1, wherein the foamed fireproof sheet is wrapped around wood, the end portions of the foamed fireproof sheet are butted against each other, and the butted portion is sealed with putty. 4. A method for partially providing a foamed fireproof sheet, in which a foamed fireproof layer is laminated on the surface of a bendable support sheet, on wood, wherein the support sheet side is provided so as to face the wood. Fireproof coating method. 5. When the wood is timber, the timber 1
Alternatively, the fireproof coating method according to claim 4, wherein foamed fireproof sheets are provided at two or more corners. 6. When the timber is a round material, one of the round materials is used.
The fireproof coating method according to claim 4, wherein a foamed fireproof sheet is provided on at least two side surfaces. 7. A foamed refractory layer comprising a group of vinyl-based thermoplastic synthetic resin, petroleum resin, phosphorus-based flame retardant, melamine-based compound, triazine-based compound, N-nitroso compound, azo compound, sulfone hydrazide compound and derivatives thereof. The fireproof coating method according to any one of claims 1 to 6, containing at least one decomposition foaming agent selected from the above, a carbonizing agent and a chlorine-based plasticizer. 8. The fireproof coating method according to claim 1, wherein the foamed fireproof layer contains a petroleum resin, a fireproofing powder and a toughness imparting agent. 9. The fireproof coating method according to claim 1, wherein the support sheet is made of a metal or an alloy material. 10. The support sheet is a synthetic resin sheet impregnated with at least one of a preservative and an insect repellent.
The fireproof coating method according to any one of 6 above. 11. A fireproof coated wood comprising a foamed fireproof sheet having a foamable fireproof layer laminated on the surface of a flexible support sheet so that the support sheet side faces the wood. 12. A foamed refractory layer having a group of vinyl-based thermoplastic synthetic resin, petroleum resin, phosphorus-based flame retardant, melamine-based compound, triazine-based compound, N-nitroso compound, azo compound, sulfone hydrazide compound and derivatives thereof. The fire-resistant coated wood according to claim 11, which contains at least one decomposed foaming agent selected from the above, a carbonizing agent and a chlorine-based plasticizer. 13. The fireproof coated wood according to claim 11, wherein the foamed fireproof layer contains a petroleum resin, a fireproofing powder and a toughening agent.