JP2008013648A - Foaming fireproof coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-based type foaming fireproof coating having excellent storage stability of the coating, forming a foamed carbonized layer having sufficient foaming properties, strength, etc., in case of a fire and exhibiting excellent fireproof performances. <P>SOLUTION: The foaming fireproof coating comprises a synthetic resin emulsion, a phosphorus compound, a polyhydric alcohol and, as necessary, a nitrogen-containing compound. In the foaming fireproof coating, the synthetic resin emulsion has one or more kinds selected from a hydroxy group, a polyalkylene oxide group, a carbonyl group and a nitrile group as a functional group. The content of the nitrogen-containing compound is ≤5 wt.% based on the whole coating. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a novel foamable refractory paint.

  As a material for protecting a base material such as steel, concrete, wood, and synthetic resin from a fire, a foamable fireproof paint that forms a foamed layer by a temperature rise at the time of fire is known.

  Foamable fire-resistant paints contain a component that decomposes as the temperature rises to generate a nonflammable gas and a component that carbonizes to form a porous carbonized layer. The fire extinguishing effect is exhibited by the occurrence of fire, and the heat insulating effect is exhibited by the formation of a porous carbonized layer by the carbonized component. Advantages of the foamable fire-resistant paint include that it can be made thinner than conventional fire-resistant coating materials, and can be finished in a refreshing feeling with less pressure.

  Various proposals have been made with respect to such foamable fire-resistant paints for the purpose of improving various physical properties such as fire resistance. For example, JP-A-10-7947 (Patent Document 1) describes using a bromine-containing phosphate ester having a melting point of 150 ° C. or higher and a bromine content of 50% by weight or more as a flame retardant. Japanese Patent Application Laid-Open No. 10-17796 (Patent Document 2) describes that in addition to polyhydric alcohol, nitrogen-containing foaming agent, flame retardant dehydrating agent, and synthetic resin, expansive graphite is further blended. Japanese Unexamined Patent Publication No. 2000-169853 (Patent Document 3) describes that at least one selected from an azo compound, a hydrazo compound, a nitroso compound, and a sulfonyl hydrazide compound is combined with expanded graphite and the like. Japanese Patent Laid-Open No. 2001-115093 (Patent Document 4) describes blending titanium oxide having anatase crystal form as titanium oxide. Japanese Patent Application Laid-Open No. 2001-323216 (Patent Document 5) describes that the average particle size of inorganic fillers, phosphorus-based flame retardants, and the like is adjusted to 10 to 50 μm.

Japanese Patent Laid-Open No. 10-7947 JP-A-10-17796 JP 2000-169853 A Japanese Patent Laid-Open No. 2001-115093 JP 2001-323216 A

By the way, in recent years, in the paint field, the water-based process has been promoted against the background of a reduction in environmental load, and a water-type paint is also demanded for such a foam fire-resistant paint. Even in the above-mentioned patent documents, there is one which describes that a resin such as a synthetic resin emulsion can be used as a binder.
However, with foamable fireproof paints that use synthetic resin emulsions, it is difficult to ensure the storage stability of the paints, even if the formulation is variously devised. In view of this, it is difficult to obtain practically satisfactory performance.

  The present invention has been made in view of such problems, and is excellent in storage stability of paint, and can form a foam carbonized layer having sufficient foamability, strength, etc. in the event of a fire, and exhibits excellent fire resistance performance. It is an object of the present invention to provide a water-based foaming fireproof paint that can be used.

As a result of intensive studies to achieve the above object, the present inventor has developed a resin that constitutes a synthetic resin emulsion in order to improve the storage stability and fire resistance of a foamable fireproof paint using a synthetic resin emulsion as a binder. The functional group of the component was specified, and further, it was found that it was effective to suppress the amount of nitrogen-containing compound that has been used for general purposes in conventional foaming fireproof paints, and the present invention was completed. .
That is, the present invention relates to the following foamable fireproof paint.

1. In a foamable fireproof paint containing a synthetic resin emulsion, a phosphorus compound, a polyhydric alcohol, and if necessary a nitrogen-containing compound,
The synthetic resin emulsion has at least one selected from a hydroxyl group, a polyalkylene oxide group, a carbonyl group, and a nitrile group as a functional group,
A foamable refractory paint characterized in that the content of the nitrogen-containing compound is 5% by weight or less of the whole paint.
2. The synthetic resin emulsion has at least a hydroxyl group as a functional group, and a hydroxyl value in a resin solid content is 0.1 to 100 mgKOH / g. The foamable fireproof paint described.

  The foamable fire-resistant paint of the present invention is excellent in storage stability and can form a dense foam carbonized layer having excellent foamability in the event of a fire, and can effectively suppress the temperature rise of a base material such as steel. Is.

Hereinafter, the present invention will be described in detail based on the embodiments.
The foamable fire-resistant paint of the present invention contains a synthetic resin emulsion, a phosphorus compound, and a polyhydric alcohol as essential components. Among these, as the synthetic resin emulsion, a synthetic resin emulsion having at least one selected from a hydroxyl group, a polyalkylene oxide group, a carbonyl group, and a nitrile group as a functional group is used. In the present invention, by using such a synthetic resin emulsion having a specific functional group, the storage stability of the paint can be increased, and further, a foamed carbonized layer having excellent foamability, strength, etc. can be obtained. it can.

  In particular, the synthetic resin emulsion has at least a hydroxyl group among the functional groups, and has a hydroxyl value of 0.1 to 100 mgKOH / g (preferably 1 to 80 mgKOH / g, more preferably 2 to 60 mgKOH / g in the resin solid content). It is desirable to use a synthetic resin emulsion that is more preferably 3 to 50 mg KOH / g). By using such a synthetic resin emulsion having a hydroxyl group, it is possible to form a foamed carbonized layer having excellent foaming properties and having high density in the foamed state. As the hydroxyl group, those bonded to a carbon atom are preferred. The hydroxyl value in the present invention is a value represented by the number of mg of potassium hydroxide equimolar to the hydroxyl group contained in 1 g of resin solid content.

  In the synthetic resin emulsion in the present invention, it is desirable to impart each functional group with a hydroxyl group-containing monomer, a polyalkylene oxide group-containing monomer, a carbonyl group-containing monomer, and a nitrile group-containing monomer. Specifically, examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 4-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and the like. In addition, monomers having both a hydroxyl group and a polyalkylene oxide group, such as polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, polyethylene glycol-polypropylene glycol (meth) acrylate, polyethylene glycol-polytetramethylene glycol (meth) acrylate Polypropylene glycol-polytetramethylene glycol (meth) acrylate and the like can also be used as the hydroxyl group-containing monomer.

  Examples of the polyalkylene oxide group-containing monomer include methoxypolyethylene glycol (meth) acrylate, methoxypolypropylene glycol (meth) acrylate, and methoxypolyethylene glycol-polypropylene glycol (meth) acrylate. Examples of the carbonyl group-containing monomer include acrolein, diacetone (meth) acrylamide, vinyl methyl ketone, vinyl ethyl ketone, and vinyl butyl ketone. Examples of the nitrile group-containing monomer include acrylonitrile and methacrylonitrile.

  As the synthetic resin emulsion in the present invention, those satisfying the above conditions can be used. Specifically, the synthetic resin emulsion is an emulsion polymer of a monomer group mainly composed of (meth) acrylic acid alkyl ester and / or aromatic monomer. In the monomer group, 0.5 to 30 parts by weight (preferably 1 to 20 parts by weight) of at least one selected from a hydroxyl group-containing monomer, a polyalkylene oxide group-containing monomer, a carbonyl group-containing monomer, and a nitrile group-containing monomer It is preferable to include at a ratio of If such a synthetic resin emulsion is used, the effect of this invention can be acquired stably. Moreover, various physical properties such as water resistance and durability of the coating film can be enhanced. In the present invention, the acrylic acid alkyl ester and the methacrylic acid alkyl ester are collectively referred to as (meth) acrylic acid alkyl ester.

Specific examples of the (meth) acrylic acid alkyl ester include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 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, Examples include cyclohexyl (meth) acrylate, phenyl (meth) acrylate, and benzyl (meth) acrylate. The weight ratio of the (meth) acrylic acid alkyl ester in the monomer group is usually 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more. The upper limit is not particularly limited, but is usually about 99.5% by weight or less (preferably 99% by weight or less).
Specific examples of the aromatic monomer include styrene, 2-methylstyrene, vinyltoluene, t-butylstyrene, chlorostyrene, vinylanisole, vinylnaphthalene, divinylbenzene, and the like. The weight ratio of the aromatic monomer in the monomer group is usually 5 to 70% by weight, preferably 10 to 50% by weight.
In the synthetic resin emulsion in the present invention, those containing any one or both of (meth) acrylic acid alkyl ester and aromatic monomer in the monomer composition can be used. In particular, when both (meth) acrylic acid alkyl ester and aromatic monomer are used, advantageous effects in water resistance, fire resistance and the like are obtained.

  In the synthetic resin emulsion in the present invention, those having a hydroxyl group as a functional group and further having at least one selected from a polyalkylene oxide group, a carbonyl group, and a nitrile group are suitable. By using such a synthetic resin emulsion, stable effects can be obtained in storage stability, mechanical stirring stability, foamability and the like. In this case, the ratio of the hydroxyl group-containing monomer in the monomer group is usually 0.5 to 15% by weight, preferably 1 to 10% by weight. The ratio (total weight ratio) of the polyalkylene oxide group-containing monomer, carbonyl group-containing monomer, and nitrile group-containing monomer is usually 0.5 to 15% by weight, preferably 1 to 10% by weight.

  In the synthetic resin emulsion in the present invention, a polymerizable monomer other than the above may be used as a constituent component if necessary. Examples of such polymerizable monomers include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, crotonic acid, maleic acid or a monoalkyl ester thereof, itaconic acid or a monoalkyl ester thereof, fumaric acid or a monoalkyl ester thereof; Phosphoric group-containing monomers such as monoethyl phosphate of hydroxyethyl (meth) acrylate, monophosphate ester of hydroxypropyl (meth) acrylate, monophosphate ester of hydroxybutyl (meth) acrylate; allyl sulfonic acid, styrene sulfonic acid, vinyl sulfone Acid, 2-methylpropanesulfonic acid and other sulfonic acid group-containing monomers; N-methylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, dimethylaminoethyl vinyl ether Amino group-containing monomers such as vinyl ester monomers such as vinyl acetate and vinyl propionate; Amide group-containing monomers such as acrylamide, methacrylamide, maleic acid amide, N-methylol (meth) acrylamide; Glycidyl (meth) acrylate, diglycidyl Epoxy group-containing monomers such as (meth) acrylate and allyl glycidyl ether; alkoxysilyl group-containing monomers such as vinyltrimethoxysilane, vinyltriethoxysilane, and γ- (meth) acryloyloxypropyltrimethoxysilane; vinylidene chloride and vinylidene fluoride Other vinylidene halide monomers such as ethylene, propylene, isoprene, butadiene, vinyl pyrrolidone, vinyl chloride, vinyl ether, vinyl ketone, vinyl amide, chloropropyl Emissions, and the like. Among these, an ionic monomer selected from a carboxyl group-containing monomer, a phosphate group-containing monomer, and a sulfonic acid group-containing monomer is 1% by weight or less (preferably 0.8% by weight or less, more preferably 0.5% by weight) in the monomer group. It is desirable to use within the range of (% by weight or less). An embodiment that does not contain such an ionic monomer in the monomer group is also suitable.

  The synthetic resin emulsion in the present invention can be produced by emulsion polymerization of a monomer group in which the polymerizable monomers are appropriately mixed. As the polymerization method, a known method may be employed, and soap-free emulsion polymerization, feed emulsion polymerization, seed emulsion polymerization, etc. may be employed in addition to ordinary emulsion polymerization. During the polymerization, an emulsifier, an initiator, a dispersant, a polymerization inhibitor, a polymerization inhibitor, a buffer, a chain transfer agent, and the like can be used. A reactive emulsifier can also be used as an emulsifier.

  The glass transition temperature of the synthetic resin emulsion can be adjusted by selecting the kind of the polymerizable monomer, the mixing ratio, and the like. The glass transition temperature may be appropriately set in consideration of final required performance and the like, but is usually about −50 to 80 ° C., preferably about −40 to 60 ° C. In the present invention, two or more kinds of synthetic resin emulsions having different glass transition temperatures can also be used. In addition, the glass transition temperature of a synthetic resin emulsion can be calculated | required with the formula of Fox.

  In the foamable fireproof paint of the present invention, such a synthetic resin emulsion is used as a binder, but other binders can be used in combination as long as the effects of the present invention are not impaired. When a plurality of binders are used, the ratio of the synthetic resin emulsion may be 50% by weight or more (preferably 70% by weight or more, more preferably 90% by weight or more) in the solid content of the binder. Of course, an embodiment in which only the synthetic resin emulsion is used as the binder is also suitable.

  The phosphorus compound in the foamable fire-resistant paint of the present invention exhibits at least one effect such as dehydration cooling effect, non-combustible gas generation effect, binder carbonization promoting effect, etc. in the event of a fire, and exhibits an effect of suppressing resin combustion. It is a component that can. Examples of such phosphorus compounds include tricresyl phosphate, diphenyl cresyl phosphate, diphenyl octyl phosphate, tri (β-chloroethyl) phosphate, tributyl phosphate, tri (dichloropropyl) phosphate, triphenyl phosphate. , Tri (dibromopropyl) phosphate, chlorophosphonate, bromophosphonate, diethyl-N, N-bis (2-hydroxyethyl) aminomethylphosphate, di (polyoxyethylene) hydroxymethylphosphate, three Examples thereof include phosphorus compounds such as phosphorus chloride, phosphorus pentachloride, ammonium phosphate, and ammonium polyphosphate. Of these, ammonium polyphosphate is particularly preferred in the present invention. These phosphorus compounds may be subjected to surface treatment or surface coating. The mixing ratio of the phosphorus compound is usually 50 to 2000 parts by weight (preferably 100 to 1000 parts by weight) with respect to 100 parts by weight of the solid content of the synthetic resin emulsion.

  The polyhydric alcohol has a function of forming a thick foamed carbonized layer having excellent heat insulation properties by dehydrating and carbonizing itself together with carbonization of the binder due to fire. Examples of the polyhydric alcohol include pentaerythritol, dipentaerythritol, tripentaerythritol, neopentaerythritol, trimethylolpropane, sorbitol, inositol, mannitol, glucose fructose, starch, and cellulose. The mixing ratio of the polyhydric alcohol is usually 5 to 600 parts by weight (preferably 10 to 400 parts by weight) with respect to 100 parts by weight of the solid content of the synthetic resin emulsion.

  The foamable fire-resistant paint of the present invention may contain a nitrogen-containing compound as necessary, but its content is 5% by weight or less (preferably 3% by weight or less, more preferably 1% by weight or less) of the whole paint. ). An embodiment that does not contain a nitrogen-containing compound (that is, a content of 0% by weight) is also suitable. In general, a nitrogen-containing compound is a component that acts as a foaming agent in a foamable refractory paint, but in an aqueous type foamable refractory paint, it may cause a decrease in the storage stability of the paint by interaction with a phosphorus compound. It will be. In the present invention, practical storage stability can be ensured by limiting the content of such a nitrogen-containing compound. Examples of the nitrogen-containing compound include melamine and derivatives thereof, dicyandiamide and derivatives thereof, azodicarbonamide, urea, thiourea and the like.

  In addition to the above-mentioned components, a filler can also be blended in the foamable fireproof paint of the present invention. Examples of fillers include silicates such as talc; carbonates such as calcium carbonate and sodium carbonate; metal oxides such as aluminum oxide, titanium dioxide, and zinc oxide; natural minerals such as clay, clay, shirasu, mica, and silica. And the like. The mixing ratio of the filler is usually 5 to 600 parts by weight (preferably 10 to 400 parts by weight) with respect to 100 parts by weight of the solid content of the synthetic resin emulsion.

The foamable fire-resistant paint of the present invention can be blended with various additives that can be used in ordinary paints as components other than those described above. Examples of such components include pigments, fibers, thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreezing agents, pH adjusters, antiseptics, antifungal agents, antialgae agents, and antibacterial agents. Agents, dispersants, antifoaming agents, adsorbents, crosslinking agents, ultraviolet absorbers, antioxidants, catalysts and the like. Moreover, expansive substances, such as expansive graphite and unexpanded vermiculite, can also be mix | blended.
The composition of the present invention can be produced by uniformly mixing the above components by a conventional method. Usually, a one-pack type may be used.

  The foamable fire-resistant paint of the present invention can exert its effect by being applied and laminated on an object to be imparted with fire resistance. Examples of the object to be coated include a wall, a pillar, a floor, a beam, a roof, and a staircase. Such an object to be coated is formed of a base material such as concrete or steel, and may be subjected to rust prevention treatment or the like. The foamable fire-resistant paint of the present invention can be applied not only to concrete and steel materials but also to base materials for wooden members, resin-based members, and the like.

  When applying the fire-resistant fire-resistant paint to the object to be coated, it may be applied once or several times using a coating device such as a spray, a roller, a brush, a trowel or a spatula. At the time of painting, the paint can be diluted with water as necessary. The film thickness of the foamable fireproof paint finally formed may be appropriately set depending on the desired fireproof performance, application site, and the like, but is usually about 0.2 to 5 mm.

  In this invention, in order to protect the coating film formed with a foamable fireproof coating material, an overcoat layer can also be laminated | stacked as needed. Such an overcoat layer can be formed by applying a known water-based or solvent-type paint. As the overcoat layer, for example, an acrylic resin-based, urethane resin-based, acrylic silicon resin-based, or fluororesin-based paint can be used. These coatings may be performed by a known coating method, and a coating instrument such as a spray, a roller, or a brush can be used.

  Examples and Comparative Examples are shown below to clarify the features of the present invention. However, the scope of the present invention is not limited to these examples.

(Example 1)
145 parts by weight of water, 4 parts by weight of sodium dodecyl sulfate, 0.5 part by weight of ammonium persulfate and the monomers shown in Synthesis Example 1 in Table 1 (total 100 parts by weight) were mixed and emulsified at 80 ° C. for 3 hours in a nitrogen atmosphere. Polymerization was performed to produce a synthetic resin emulsion. The synthetic resin emulsion obtained by the above method had a solid content of 41% by weight and an average particle size of 130 nm.

  Next, with respect to 35 parts by weight of the synthetic resin emulsion, 35 parts by weight of ammonium polyphosphate, 7 parts by weight of dipentaerythritol, 9 parts by weight of titanium dioxide, 10 parts by weight of water, 2 parts by weight of a film-forming aid, 1. 5 parts by weight, 0.3 parts by weight of antifoaming agent, and 0.2 parts by weight of viscosity modifier were uniformly mixed and stirred by a conventional method to produce a foaming fireproof paint (mixing amount of nitrogen-containing compound; 0 weight) %). The following various tests were performed using this paint.

(Foaming ratio)
A paint was applied to a black skin steel plate with a wet film thickness of 1 mm using a film applicator, and cured for 7 days in an atmosphere of 23 ° C. and 50% relative humidity (hereinafter referred to as “standard state”) to obtain a test specimen. This test body was heated at 700 ° C. for 10 minutes, and the expansion ratio based on the initial film thickness was measured. The results are shown in Table 2. The evaluation criteria for the expansion ratio in this test are “◎” for an expansion ratio of 15 times or more, “O” for an expansion ratio of 10 times to less than 15 times, “△” for an expansion ratio of 5 times to less than 10 times, An expansion ratio of less than 5 was defined as “x”.

(Denseness)
The test body for which the expansion ratio was measured was cut, and the denseness of the foamed carbonized layer in the cross section was visually confirmed. The results are shown in Table 2. Evaluation criteria were made into 4 steps ((double-circle)>(circle)> (triangle | delta)> x) which made "*" the thing with a high denseness, and "x" with a low denseness.

(water resistant)
A paint was applied to the black leather plate with a film thickness of 1 mm using a film applicator, and was cured for 7 days in a standard state to obtain a test specimen. After this test body was immersed in water at 23 ° C. for 3 days, the surface state of the coating film was visually confirmed. The results are shown in Table 2. The evaluation criteria are “◎” for the case where no blister was observed, “◯” for the blister generation area of less than 10%, and “△” for the blister generation area of 10% to less than 20%. In addition, the case where the blister generation area was 20% or more was designated as “x”.

(Storage stability)
250 ml of the prepared paint was put into a 300 ml cup and sealed, and then stored in a thermostatic bath at 50 ° C. for 30 days, and a change in viscosity before and after storage was confirmed. The results are shown in Table 2. The evaluation criteria are “◎” for a viscosity change rate of less than 10%, “◯” for a viscosity change rate of 10% to less than 20%, “Δ” for a viscosity change rate of 20% to less than 50%, and a viscosity change rate of 50%. The above was designated as “x”.

(Example 2)
A synthetic resin emulsion was produced in the same manner as in Example 1 except that the monomer composition shown in Synthesis Example 2 in Table 1 was used. This synthetic resin emulsion had a solid content of 41% by weight and an average particle size of 134 nm.
Next, a foamed fireproof paint was produced in the same manner as in Example 1 except that the synthetic resin emulsion of Synthesis Example 2 was used instead of the synthetic resin emulsion of Synthesis Example 1 (mixing amount of nitrogen-containing compound; 0 weight%). The same test as in Example 1 was performed using the obtained paint. The results are shown in Table 2.

(Example 3)
A synthetic resin emulsion was produced in the same manner as in Example 1 except that the monomer composition shown in Synthesis Example 3 in Table 1 was used. This synthetic resin emulsion had a solid content of 41% by weight and an average particle size of 132 nm.
Next, a foamed fireproof paint was produced in the same manner as in Example 1 except that the synthetic resin emulsion of Synthesis Example 3 was used instead of the synthetic resin emulsion of Synthesis Example 1 (mixing amount of nitrogen-containing compound; 0 weight%). The same test as in Example 1 was performed using the obtained paint. The results are shown in Table 2.

Example 4
A synthetic resin emulsion was produced in the same manner as in Example 1 except that the monomer composition shown in Synthesis Example 4 in Table 1 was used. This synthetic resin emulsion had a solid content of 41% by weight and an average particle size of 127 nm.
Next, a foamed fireproof paint was produced in the same manner as in Example 1 except that the synthetic resin emulsion of Synthesis Example 4 was used instead of the synthetic resin emulsion of Synthesis Example 1 (mixing amount of nitrogen-containing compound; 0 weight%). The same test as in Example 1 was performed using the obtained paint. The results are shown in Table 2.

(Example 5)
A synthetic resin emulsion was produced in the same manner as in Example 1 except that the monomer composition shown in Synthesis Example 5 in Table 1 was used. This synthetic resin emulsion had a solid content of 41% by weight and an average particle size of 129 nm.
Next, a foamed fireproof paint was produced in the same manner as in Example 1 except that the synthetic resin emulsion of Synthesis Example 5 was used instead of the synthetic resin emulsion of Synthesis Example 1 (mixing amount of nitrogen-containing compound; 0 weight%). The same test as in Example 1 was performed using the obtained paint. The results are shown in Table 2.

(Comparative Example 1)
A synthetic resin emulsion was produced in the same manner as in Example 1 except that the monomer composition shown in Synthesis Example 6 in Table 1 was used. This synthetic resin emulsion had a solid content of 41% by weight and an average particle size of 132 nm.
Next, a foamed fireproof paint was produced in the same manner as in Example 1 except that the synthetic resin emulsion of Synthesis Example 6 was used instead of the synthetic resin emulsion of Synthesis Example 1 (mixing amount of nitrogen-containing compound; 0 weight%). The same test as in Example 1 was performed using the obtained paint. The results are shown in Table 2.

(Comparative Example 2)
32 parts by weight of ammonium polyphosphate, 5 parts by weight of dipentaerythritol, 6 parts by weight of melamine, 8 parts by weight of titanium dioxide, 10 parts by weight of water, and 10 parts by weight of water for the synthetic resin emulsion of Synthesis Example 1 in Table 1 2 parts by weight, 1.5 parts by weight of a dispersant, 0.3 parts by weight of an antifoaming agent, and 0.2 parts by weight of a viscosity modifier were uniformly mixed and stirred by a conventional method to produce a foamable fireproof coating (including Mixing amount of nitrogen compound; 6% by weight). The same test as in Example 1 was performed using the obtained paint. The results are shown in Table 2.

Claims (2)

In a foamable fireproof paint containing a synthetic resin emulsion, a phosphorus compound, a polyhydric alcohol, and if necessary a nitrogen-containing compound,
The synthetic resin emulsion has at least one selected from a hydroxyl group, a polyalkylene oxide group, a carbonyl group, and a nitrile group as a functional group,
A foamable refractory paint characterized in that the content of the nitrogen-containing compound is 5% by weight or less of the whole paint.   The foamable fire-resistant paint according to claim 1, wherein the synthetic resin emulsion has at least a hydroxyl group as a functional group, and a hydroxyl value in a resin solid content is 0.1 to 100 mgKOH / g.