JP2003238902A - Composition for intumescent fireproof coating for indoor use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition for an intumescent fireproof coating for indoor use that reduces health hazardous substances in the room, presents reduced hazards in case of a fire, and can be used not only for flat coating but also for thick coating with a rugged pattern. <P>SOLUTION: The coating composition comprises mainly (A) an aqueous resin, (B) a phosphorus flame retardant, (C) an intumescent agent, (D) a polysaccharide and/or a polyhydric alcohol, and (E) diatomous earth. The weight ratios are (A):(B):(C):(D):(E)=100:70-400:20-160:20-160:80-200. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of providing not only smooth coating on the wall surface, ceiling, etc. of interior interior surfaces by various coating methods such as spraying, rollers, etc., but also an uneven pattern of thick film. TECHNICAL FIELD The present invention relates to a foamable fire-resistant coating composition for a vehicle. More specifically, it is possible to reduce health hazard components in the room, and further has the property of preventing the spread of fire by foaming and forming a carbonized layer when heated when a fire occurs. It relates to a foamed fireproof coating composition.

[0002]

2. Description of the Related Art Sheet materials, embossed cloths, wallpaper and the like have been widely used for the purpose of imparting decorativeness to the wall surface, ceiling, etc. of interior surfaces. In addition, paints are often applied to these sheet materials, cloths, wallpaper, etc. in order to hide dirt. However, the above-mentioned sheet material, embossed cloth,
Wallpapers and the like have a problem that, when a fire occurs, there is a risk that toxic gas is generated due to the combustion of the constituent organic components or the fire spreads.

As a refractory paint, Japanese Patent Application Laid-Open No. 7-33112 is used.
Japanese Unexamined Patent Publication No. 4 (1994) discloses a foaming fire-resistant paint obtained by adding a foaming agent, a carbonized layer forming agent, an inorganic powder, a melamine resin and an acrylic resin. This paint forms a foam layer when heated in the event of a fire, and has the effect of delaying the temperature rise of the steel frames of buildings, etc.It is mainly used for fireproof coating applications, but it is sufficient as a measure for indoor pollution. It wasn't.

[0004] Further, as a coating material for preventing indoor pollution, which has fire resistance and is capable of imparting a design property, there is a cement-based binder, but since cement is used as a binder, cracking, coating workability, etc. There was a problem. On the other hand, even when painting, paints have been selected that take into consideration the damage in the event of a fire, but their effect is not sufficient for the risk of fire on flammable substrates, and there are restrictions on designability. It was something.

Further, in recent years, chemical substances such as formaldehyde and plasticizers emitted from heat insulating materials and plywood used for indoor furniture, wall surfaces and ceilings, and adhesives used for them bring about health hazards. Indoor pollution called sick house syndrome has come to be regarded as a problem, and a substance that does not emit these chemical substances is desired.

[0006]

DISCLOSURE OF THE INVENTION The present invention is capable of reducing indoor health-impairing components, has a low risk in the event of a fire, and is not only for smooth coating, but also for thick-film uneven patterns. It is an object of the present invention to provide an indoor foamable fireproof coating composition that can be applied.

[0007]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have found that a foaming agent that forms a fire-resistant foam layer and a phosphorus-based compound that promotes foaming under heating when a fire occurs. By using a flame retardant, polysaccharides and polyhydric alcohols that form a carbonized layer, and adding diatomaceous earth that has an adsorbing effect to this, it has the function of forming a carbonized layer under heating during a fire and preventing the spread of fire. The present invention has been accomplished by finding a formulation of a coating composition that can form a coating film that can not only be provided but also adsorb indoor health-impairing components. The present invention includes the following inventions.

(1) As a main component (A) an aqueous resin,
An indoor foamable fireproof coating composition comprising (B) a phosphorus-based flame retardant, (C) a foaming agent, (D) a polysaccharide and / or a polyhydric alcohol, and (E) diatomaceous earth.

(2) As a main component (A) an aqueous resin,
(B) phosphorus-based flame retardant, (C) foaming agent, (D) polysaccharide and / or polyhydric alcohol, and (E) containing diatomaceous earth,
The mixing ratio of the components is (A) :( B):
(C) :( D) :( E) = 100: 70 to 400: 20
˜160: 20 to 160: 80 to 200, a foamable indoor fireproof coating composition.

(3) The mixing ratio of the above components is (A) :( B) :( C) :( D) :( E) = 100: 1 by mass ratio.
00-300: 35-120: 35-120: 100-
The foamable indoor fire-resistant coating composition according to (1) or (2), which contains 180.

(4) The aqueous resin (A) is at least selected from synthetic resin emulsions such as vinyl acetate-based resin emulsions, acrylic ester-based resin emulsions and ethylene-based resin emulsions, water-soluble acrylic resins and aqueous alkyd resins. The foamable indoor fire-resistant coating composition for indoor use according to any one of (1) to (3), which is one kind.

(5) The phosphorus-based flame retardant (B) is at least one selected from ammonium polyphosphate, microencapsulated ammonium polyphosphate, foamable phosphorus-aluminum compounds, and the like (1) ) ~
The indoor foamable fireproof coating composition according to any one of (4).

(6) The foaming agent (C) is at least one selected from nitrogen-containing compounds such as melamine, urea, dicyandiamide, guanidine and guanidine sulfamate (1) to (5). The foamable fireproof coating composition for indoor use according to any one of 1.

(7) The (D) polysaccharide and / or polyhydric alcohol is a polysaccharide such as glucose or sucrose, and monopentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol,
Tris (2-hydroxyethyl) isocyanate, triethylene glycol, sorbitol, resorcinol,
Any one of (1) to (6), which is at least one selected from polyhydric alcohols such as glycerin, trimethylolmethane, trimethylolpropane, diethylene glycol, propylene glycol, hexamethylene glycol, and inositol. A foamable fire-resistant coating composition for indoor use according to item.

(8) In addition to the main components (A) to (E), an inorganic filler selected from silica stone, calcium carbonate, clay, titanium oxide, silica and the like is contained (1). The foamable indoor fire-resistant coating composition according to any one of to (7).

(9) A flame-retardant filler such as aluminum hydroxide or magnesium hydroxide is contained in addition to the main components (A) to (E) described above (1) to (8).
The foamable fireproof coating composition for indoor use according to any one of 1.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The indoor foamable fireproof coating composition of the present invention comprises (A) an aqueous resin, (B) a phosphorus-based flame retardant, and (C).
An indoor foamable fire-resistant coating composition containing a foaming agent, (D) a polysaccharide and / or a polyhydric alcohol, and (E) diatomaceous earth as main components.

The water-based resin (A) used as one of the main components in the indoor foamable fire-resistant coating composition of the present invention is a coating film-forming component, and also serves as an adhesive with the base. As such an aqueous resin, a commonly known resin can be used. Examples thereof include synthetic resin emulsions such as vinyl acetate-based resin emulsions, acrylic ester-based resin emulsions, ethylene-based resin emulsions, water-soluble acrylic resins, and water-based alkyd resins.

The phosphorus-based flame retardant (B) used as one of the main components in the indoor foamable fire-resistant coating composition of the present invention is a component of the fire-resistant coating composition when subjected to heat of about 250 ° C. or higher. It is a component that acts as a dehydration catalyst to dehydrate organic substances and produces a non-combustible ammonia gas, and exerts a fire extinguishing effect by desorbing H ₂ O. This component further promotes the formation of carbides and coats it. Suppresses film burning. At the same time, it is a component that itself forms a fireproof inorganic phosphoric acid film to enhance the fire resistance of the fire resistant coating film.

As the phosphorus-based flame retardant as the component (B), ammonium polyphosphate, microencapsulated ammonium polyphosphate, and expandable phosphorus-aluminum-based compound are preferable, and they form a fireproof coating film having good water resistance and fire resistance. It is particularly preferable to use microencapsulated ammonium polyphosphate in which ammonium polyphosphate is coated with a resin because it can be obtained.

Similarly, as the foaming agent (C) which is one of the main components, various kinds can be used as long as they can generate a nonflammable gas such as nitrogen or ammonia when heated. However, specific examples thereof include nitrogen-containing compounds such as melamine, urea, dicyandiamide, guanidine, and guanidine sulfamate. The component (C) can further expand the carbide generated by the combustion of the fire-resistant coating film, and thereby further enhance the heat insulating property of the fire-resistant coating film.

Similarly, (D) a polysaccharide and / or a polyhydric alcohol, which is one of the main components, is carbonized by heat during the foaming of the above-mentioned foaming agent to form a porous carbonized layer containing bubbles therein. Is a component forming. For example, polysaccharides such as glucose and sucrose, and monopentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, tris (2-hydroxyethyl) isocyanate, triethylene glycol, sorbitol,
Resorcinol, glycerin, trimethylolmethane,
Examples thereof include polyhydric alcohols such as trimethylolpropane, diethylene glycol, propylene glycol, hexamethylene glycol and inositol.

Similarly, (E) diatomaceous earth, which is one of the main components, is a fossilized soil of a single-cell plant (diatomaceous earth) after thousands of years and has fine pores on its surface. It has a large surface area and has a humidity control function that absorbs moisture into this porous structure and absorbs and releases moisture. In addition, when a fire occurs, the phosphorus-based flame retardant decomposes into the interior at an initial stage up to 250 ° C. A fire extinguishing effect due to the release of water can be expected. Such an effect cannot be expected for conventional extender pigments for coating materials such as calcium carbonate, silica powder, and clay.

The design required for interior paint is
Simply adjusting the amount of thickener to make it highly viscous does not provide the desired thick film with a well-designed coated surface, and it is necessary to add an organic thickener in an amount greater than the usual amount used. However, when diatomaceous earth is used for the above purpose, the amount of the organic thickener used can be reduced.

Further, the diatomaceous earth in the foamable fireproof coating composition of the present invention is such that even after the foamable fireproof paint foams by heat to form a carbonized layer, the air layer in the porous structure has a heat insulating effect. To increase fire resistance. In addition to fire resistance, diatomaceous earth also has a function of adsorbing a health hazard component which is a problem in the indoor environment.

In the indoor foamable fireproof coating composition of the present invention, the mixing ratios of the respective components (A), (B), (C), (D) and (E) are (A) water based. Resin: (B)
Phosphorus flame retardant: (C) Foaming agent: (D) Polysaccharide / polyhydric alcohol: (E) Diatomaceous earth = 100: 70-400: 20-
160: 20 to 160: 80 to 200, preferably (A) aqueous resin: (B) phosphorus flame retardant: (C) foaming agent: (D) polysaccharide / polyhydric alcohol: (E) diatomaceous earth = 1
00: 100-300: 35-120: 35-120:
100 to 180.

If the blending ratio of each component deviates from this ratio,
Will it not be possible to exert the effect of reducing indoor health hazard components?
Alternatively, the fire spread prevention property in the event of a fire becomes insufficient.
For example, if the amount of the phosphorus-based flame retardant (B) is less than 70 parts by mass, the formation of the carbonized layer is insufficient and the foaming rate becomes small.
When the amount is more than 400 parts by mass, the bubbles are coarse and sufficient fire resistance cannot be obtained.

Regarding the foaming agent (C), if the compounding ratio is less than 20 parts by mass, the foaming ratio will be too small, and if it is more than 160 parts by mass, the bubbles in the foaming layer will be coarse and sufficient. Fire resistance cannot be obtained.

Regarding the (D) polysaccharide and / or polyhydric alcohol, if the blending ratio is less than 20 parts by mass, a sufficient carbonized layer cannot be formed, and 160
When the amount is more than the amount by mass, the coating film sags due to melting and softening of the polysaccharide or polyhydric alcohol before forming a sufficient carbonized layer, and the fire resistance is deteriorated.

For (E) diatomaceous earth, the compounding ratio is 80
If the amount is less than the amount by mass, adsorption of health-impairing components becomes insufficient, and the effect of reducing the amount of the organic thickener used is poor. On the other hand, if the amount is more than 200 parts by mass, it becomes difficult to manufacture the coating material, and further the coating workability is deteriorated.

In the indoor foamable fireproof coating composition of the present invention, an inorganic filler may be used, if necessary, in addition to the above-mentioned main components. As the inorganic filler, any of those for ordinary paints can be used, and examples thereof include silica stone, calcium carbonate, clay, titanium oxide, silica and the like. It is also possible to use a known flame-retardant filler such as aluminum hydroxide or magnesium hydroxide in combination. When such an inorganic filler is used, the mixing ratio is appropriately 100 parts by mass or less with respect to 100 parts by mass of the resin solid content of the synthetic resin.

In the indoor foamable fireproof coating composition of the present invention, if necessary, a thickener, a defoaming agent, a preservative,
Antifungal agents, dispersants and the like may be used as appropriate. The indoor coating composition of the present invention can be produced by stirring and mixing the above components in a conventional manner.

The thus obtained coating material of the present invention having significantly improved fire resistance can be easily applied by a general coating method such as brushing, ironing, roller coating, spraying, etc., and not only smooth coating but also thick film with unevenness It is possible to form a pattern. The coating composition of the present invention can be applied to the wallpaper, plywood, wood, asbestos-cement board, concrete, mortar, FRP, plastics, metal surface directly or after the primer treatment, and then the coating composition of the present invention can be applied.

[0034]

EXAMPLES Hereinafter, examples of the blending ratio of each component in the coating composition of the present invention and the action and effect based thereon will be specifically described based on Examples and Comparative Examples, but the present invention is based on these Examples and the like. It is not limited.

(A) Aqueous resin, (B) Phosphorus flame retardant,
The indoor foamable fire-resistant coating composition of each example was prepared by using each substance listed in Table 1 as each component of (C) foaming agent, (D) polysaccharide / polyhydric alcohol, and (E) diatomaceous earth. . For comparison, a coating composition lacking any of the components constituting the fire-resistant coating composition of the example was prepared.
The compounding ratio is shown in Table 1.

[0036]

[Table 1]

The water-based resin (1) in the table is the product name "Polysol APK-2" (acrylic ester resin emulsion) manufactured by Showa Highpolymer Co., Ltd., water-based resin (2).
The product used was "Boncoat 6938" (vinyl acetate resin-vinyl versatate vinyl emulsion) manufactured by Dainippon Ink and Chemicals, Inc. Also, a small amount of additive,
Thickeners, dispersants, defoamers and preservatives were used. As the titanium dioxide, a trade name “JR-600A” (rutile type titanium oxide) manufactured by Teika was used.

(Test Method) The coating composition having the composition shown in Table 1 was subjected to the following tests. (Fireproof test) A 4 mm thick veneer plate with a size of 15 mm x 22 cm, coated with a trade name "Eco Sealer White" manufactured by Kowa Chemical Industry Co., Ltd., which is an aqueous undercoat material for indoor use, is used as a base material 1 kg / m ^{2 of} each paint obtained above,
It was cured for about 2 weeks to give a test sample. The above test piece is leaned vertically, and is placed with a gas burner from about 10 cm away.
It was burned for a minute and the result was visually evaluated. X: After burning for 5 minutes, the coating film and the underlying veneer plate burn. ◯: After burning for 5 minutes, the foam layer was uniform and had a foam thickness,
The underlying plywood does not burn.

(Formaldehyde adsorption test) 5 mm thick ×
A glass plate having a size of 15 × 15 cm was used as a base material, and 1 kg / m ^{2 of} each of the coating materials obtained above was applied on the base material and cured for about 2 weeks to obtain a test body. This test body was allowed to stand in a desiccator, and formaldehyde gas adjusted to 20 ppm was enclosed therein. After 24 hours, detect the residual concentration of formaldehyde gas in the desiccator (Gastech, 91L)
It was measured at. The evaluation was performed according to the following criteria. A: The color of the detector tube does not change (below the detection limit). ◯: 0.1 to 15 ppm. X: 15 ppm or more.

The test results are shown in Table 2.

[Table 2]

As is clear from Table 2, the coating materials of Examples 1 to 4 were fireproof, had a low residual formaldehyde concentration, and had adsorption performance. On the other hand, the paints of Comparative Examples 1 to 3 had formaldehyde adsorption performance but no fire protection performance, and Comparative Example 4 had fire protection performance but no formaldehyde adsorption performance.

[0042]

INDUSTRIAL APPLICABILITY The indoor foaming fire-resistant paint of the present invention imparts not only a smooth coating but also a thick-film uneven pattern to the wall surface, ceiling, etc. of the interior interior surface by various coating methods such as spraying and rollers. It is also possible to prevent the spread of fire even when applied to a flammable substrate, and the coating film has the effect of adsorbing and reducing indoor health hazard components.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kyoki Takaichi             1-9-13 Kita-Kutani, Ota-ku, Tokyo Tsunewa Chemical             Central Research Institute of Industry Co., Ltd. (72) Inventor Atsushi Atsushi             6-1-1 Heiwajima, Ota-ku, Tokyo Tokyo distribution             Center Building 9F Kowa Chemical Industry Co., Ltd.             Within F-term (reference) 4J038 BA012 CB021 CF021 CG141                       DD121 HA386 HA426 JA21                       JB20 JB23 JB24 JB36 JC08                       KA02 MA10 NA15 PB02 PC08

Claims (7)

[Claims] 1. A water-based resin (A), a phosphorus-based flame retardant (B),
(C) A foaming agent, (D) a polysaccharide and / or polyhydric alcohol, and (E) a coating material containing diatomaceous earth as a main component, and in a mass ratio, (A) :( B) :( C) :( D ): (E) =
100: 70-400: 20-160: 20-160:
A foamable refractory coating composition for indoor use, which contains 80 to 200. 2. The (A) water-based resin is at least one selected from synthetic resin emulsions such as vinyl acetate-based resin emulsions, acrylic ester-based resin emulsions and ethylene-based resin emulsions, water-soluble acrylic resins and water-based alkyd resins. The foamable indoor fire-resistant coating composition according to claim 1, wherein 3. The phosphorus-based flame retardant (B) is at least one selected from ammonium polyphosphate, microencapsulated ammonium polyphosphate, expandable phosphorus-aluminum-based compounds, and the like. Or the foamable indoor fire-resistant coating composition according to item 2. 4. The (C) foaming agent is melamine, urea,
The indoor foamable fireproof coating composition according to any one of claims 1 to 3, which is at least one kind of a nitrogen-containing compound selected from dicyandiamide, guanidine, and guanidine sulfamate. 5. The (D) polysaccharide and / or polyhydric alcohol is a polysaccharide such as glucose or sucrose, and monopentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, tris (2). -Hydroxyethyl) isocyanate, triethylene glycol, sorbitol, resorcinol, glycerin, trimethylolmethane, trimethylolpropane, diethylene glycol, propylene glycol, hexamethylene glycol, at least one selected from polyhydric alcohols such as inositol The foamable indoor fire-resistant coating composition according to any one of claims 1 to 4, which is characterized by the above-mentioned. 6. An inorganic filler selected from the group consisting of silica stone, calcium carbonate, clay, titanium oxide, and silica, in addition to the main components (A) to (E). The foamable fireproof coating composition for indoor use according to any one of 1. 7. A flame-retardant filler made of aluminum hydroxide or magnesium hydroxide is contained in addition to the main components (A) to (E).
7. The foamable indoor fire-resistant coating composition according to any one of 6 above.