JPH107947A - Foaming type fireproof coating composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a foaming type fireproof coating compsn. which forms a uniform foam layer when a fire occurs, maintains a good carbonized layer in the foam layer, and thus can permit effective thermal insulation by using a specific compd. as the flame retardant in preparing a coating material contg. a resin, a blowing agent, a carbon source, an inorg. powder, and a flame retardant. SOLUTION: This compsn. comprises a resin (e.g. a styrene-acryl resin), a blowing agent (e.g melamine), a carbon source (e.g. dipentaerythritol), an inorg. powder (e.g. titanium dioxide), and a flame retardant. The retardant is a Br-contg. phosphoric ester (condensate) [e.g. tris(tribromoneopentyl) phosphate (condensate)] having an m.p. of 150 deg.C or higher, pref. 170-250 deg.C, and a Br content of 50wt.% or higher, pref. 50-80wt.% and is used pref. in an amt. of 5-100 pts.wt. based on 100 pts.wt. resin solid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant paint applied to a steel frame or a concrete of a building, and more particularly to a fire-resistant paint which not only forms a uniform foam layer under heating when a fire occurs, but also forms the foam layer. The present invention relates to a foamed refractory paint that can effectively hold a carbonized layer in a foamed layer and effectively insulate heat.

[0002]

2. Description of the Related Art A steel frame of a building is a non-combustible building material. However, the strength of the building during heating in the event of a fire is significantly reduced, which may cause the entire building to collapse. The surface has been protected with a fire-resistant coating material to prevent a sharp drop in strength.

Conventionally, as the refractory coating material, there has been used a paste-like spray material obtained by mixing a cement-based inorganic binder with a lightweight aggregate such as slag wool and kneading with water. However, since the coating material requires a thickness of 30 mm or more to the steel frame, not only is there a restriction in the construction method, but also the surface of the coating surface is severely uneven, and it is not suitable for a part requiring aesthetics utilizing the design of the steel frame itself. It was appropriate.

In view of the above, various fire-resistant coating materials in which a foaming agent, a carbon-forming material and the like are mixed with an organic binder have been proposed as fire-resistant coating materials suitable for portions requiring aesthetic appearance (for example, Japanese Patent Application Laid-Open No. 49-49). -132821, JP-A-5-8
No. 6310). The coating film of the paint is decomposed by heat at the time of fire, generates incombustible gas and foams to form a porous carbonized layer. This serves as a heat insulating layer and suppresses a rise in temperature of the steel frame. According to the paint, a thin film can be formed on the surface of the steel frame, which is advantageous in terms of design.

However, in the conventional paint, the foamed shape upon heating is non-uniform, and the ratio of the carbonized layer occupied therein is low. Therefore, the heat insulating effect is insufficient, and when the heating is advanced, the carbonized layer is not formed. In some cases, the adhesion to the underlayer deteriorated, and the carbonized layer itself fell off and collapsed, exposing the substrate and failing to function as a heat insulating layer.

[0006]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, by containing a specific flame retardant, the carbonized layer can be effectively retained in the foamed layer. The present inventors have found that heat insulation can be achieved, and arrived at the present invention.

That is, the present invention is a paint containing a resin, a foaming agent, a carbon supply agent, an inorganic powder and a flame retardant, wherein the flame retardant is bromine-containing having a melting point of 150 ° C. or more and a bromine content of 50% by weight or more. An object of the present invention is to provide a foam type refractory paint using a phosphate ester and / or a condensate thereof.

Hereinafter, the present invention will be described in detail.

[0009] The resin used in the present invention is a coating film forming component, for example, acrylic resin, olefin acrylic resin,
Alkyd resins, melamine resins, epoxy resins, and the like are listed. Of these, styrene acrylic resins are preferred from the viewpoint of coating workability, pigment dispersibility, and the like.

Examples of the blowing agent used in the present invention include dicyandiamide, azodicarbonamide; melamine, urea, guanidine; phosphates such as ammonium polyphosphate; polyols, chlorinated paraffins, potassium hydrogen carbonate, dinitrosopentamethylene. Examples thereof include tetramine and barium azodicarboxylate, and these can be used alone or in combination of two or more. Among them, it is preferable to use a phosphate such as ammonium polyphosphate, melamine, and chlorinated paraffin in combination from the viewpoint of the balance between the expansion ratio and the strength of the foamed layer.

The content of the foaming agent is 10% of the above resin solid content.
A suitable range is 150 to 1100 parts by weight, preferably 300 to 800 parts by weight, based on 0 parts by weight. Especially,
Ammonium polyphosphate is used in an amount of 100 to 500 parts by weight, preferably 200 to 40 parts by weight, based on 100 parts by weight of the resin solid content.
0 parts by weight, 25 to 300 parts by weight of melamine, preferably 50 to 200 parts by weight, and 25 to 3 parts of chlorinated paraffin.
It is suitable that the content is in the range of 00 parts by weight, preferably 50 to 200 parts by weight. If the content of the ammonium polyphosphate is less than 100 parts by weight, the foaming ratio becomes low and a carbonized layer is difficult to be formed. Absent. When the melamine content is less than 25 parts by weight, the foamed layer is soft and easily collapsed, while
Exceeding the weight part is undesirable because the expansion ratio becomes low. If the chlorinated paraffin content is less than 25 parts by weight, the foaming ratio becomes low. On the other hand, if it exceeds 300 parts by weight, bubbles in the foamed layer become coarse and become hollow and easily collapsed.

As the carbon supply agent, for example, polysaccharides, polyhydric alcohols, graphite and the like can be used.
Polyhydric alcohols such as di and tripentaerythritol are preferred.

The content of the carbon feeder is suitably in the range of 25 to 300 parts by weight, preferably 50 to 200 parts by weight, based on 100 parts by weight of the resin solid content. If the content of the carbon supply agent is less than 25 parts by weight, the foaming ratio becomes low and a carbonized layer is difficult to be formed. It is not desirable.

As the inorganic powder, for example, titanium oxide,
Examples thereof include aluminum oxide, mica, silica, clay, clay, silicate, and carbonate, and these can be used alone or in combination of two or more.

The content of the inorganic powder is 1% of the above resin solid content.
The range of 20 to 200 parts by weight, preferably 30 to 150 parts by weight, per 100 parts by weight is appropriate. If the content of the inorganic powder is less than 20 parts by weight, the bubbles in the foamed layer become non-uniform and the adhesion to the base decreases, while if it exceeds 200 parts by weight, the coating workability is adversely affected and the coating film may crack. Is not desirable.

In the present invention, the flame retardant has a melting point of 150 ° C. or more, preferably 170 to 250 ° C., and a bromine content of 50%.
% By weight or more, preferably 50 to 80% by weight, of a brominated phosphoric acid ester and / or a condensate thereof is used. When the melting point of the flame retardant is less than 150 ° C., the flame retardant is decomposed faster than the foaming agent, so that the effect of forming the carbonized layer in the foamed layer cannot be obtained. Is not preferred because no effect is obtained in the formation of

Examples of the brominated phosphoric acid ester include tris (tribromoalkyl) phosphate having a branched alkyl group having 5 or more carbon atoms and condensates thereof, among which tris (tribromoneopentyl) ) Phosphates and / or condensates thereof are preferred.

The content of the flame retardant is 5 to 100 parts by weight, preferably 20 to 8 parts by weight, based on 100 parts by weight of the resin solids.
A range of 0 parts by weight is suitable. When the content of the flame retardant is 5
If the amount is less than 100 parts by weight, the effect of forming the carbonized layer cannot be obtained.

The paint of the present invention may further contain, if necessary, ordinary paint additives such as a deterioration inhibitor, a colorant, a dispersant, an organic solvent and water, in addition to the above components.

The paint of the present invention can be applied to various base materials such as steel frames and concrete by a usual coating method such as brushing and spraying.

In particular, it is desirable to remove rust from a steel frame by blasting or the like, and then apply an undercoat with a shop primer or an undercoat and then apply the paint of the present invention. On the surface of the formed refractory coating film, an intermediate coating and a top coating can be further sequentially performed as necessary.

[0022]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples.

Examples and Comparative Examples Each of the components was mixed in the amounts shown in Table 1 to prepare each foam type refractory paint. (* 1) to (* 7) in the table are as follows.

(* 1) Resin: "Priolite", manufactured by Goodyear, styrene acrylic resin, solid content 100% (* 2) Tris (tribromoneopentyl) phospho-
G: melting point about 181 ° C., bromine content 70% by weight (* 3) Tetrabromophthalate ester: liquid, bromine content 45% by weight (* 4) Tetrabromobisphenol A: melting point about 180
° C, bromine content 59% by weight (* 5) dodecane bromodiphenyl oxide: melting point about 300 ° C, bromine content 83
% By weight (* 6) Tris (dibromopropyl) phosphate: liquid, bromine content 69% by weight (* 7) Diluent: Mixture of mineral spirit and xylene Performance test Grit blasted 300 × 300 × 3.2 mm
Each of the foamed refractory paints obtained above was applied by spray coating so as to have a dry film thickness of about 2 mm, cured for about 2 weeks, and each test coated plate was subjected to the test. Created.

The obtained test coated plate was placed in an electric furnace, and was subjected to JI
The specimen was subjected to a fire resistance test in which it was heated to a predetermined temperature with respect to an elapsed time so as to follow a standard heating curve shown in SA-1304.
One hour later, when the heating temperature reached 925 ° C., the test was terminated, and the foaming state of the refractory coating film of the test coated plate was observed and evaluated for the following items. Table 1 shows the evaluation results.

(Uniformity of the foamed layer) 全面: The entire surface is uniformly foamed and good. △: Some of the portions are non-uniform and slightly defective. X: The entire surface is non-uniform and defective (dripping of the foamed layer). Good: no sagging cracks Good: some sagging cracks, slightly poor ×: sagging cracks all over, poor (cavities of foaming layer) The foamed layer was cut out and its cross section was observed.

：: good without any cavities △: small cavities observed, slightly poor ×: large cavities observed, poor (foaming ratio) The foaming ratio was examined from the thickness of the foam layer with respect to the coating film thickness.

○: 35 times or more Δ: 25 times or more to less than 35 times ×: less than 25 times The proportion of the carbonized layer in the foamed layer was examined.

：: 80% or more Δ: 50 to 80% ×: less than 50% (Strength of foam layer) The foam layer was pressed with a finger from above and pressed to examine its hardness and toughness.

○: Hard and not easily broken, good Δ: Hardness and toughness are slightly poor ×: Fragile and easily broken, poor (adhesion to base material) When cutting foamed layer, base material Was examined for adhesion.

：: good △: adhered to the base material, but easily peeled off ×: there were some places that were not adhered to the base material due to the presence of cavities

[0032]

The foam type refractory paint of the present invention contains a specific flame retardant so that the flame retardant promotes the dehydration to carbonization of the carbon feeder, and blocks the floating oxygen on the surface of the coating film and the foaming agent. In order to suppress the volatilization of incombustible gas such as ammonia and chlorine gas generated from the decomposition of carbon dioxide, the carbonized layer is favorably retained in the foamed layer, and the heat insulation can be effectively performed.

[0033]

[Table 1]

Claims (2)

[Claims] 1. A paint containing a resin, a foaming agent, a carbon supplier, an inorganic powder and a flame retardant, wherein the flame retardant has a melting point of 1
A foam-type refractory paint characterized by using a bromine-containing phosphate ester having a bromine content of 50% by weight or more at 50 ° C. or more and / or a condensate thereof. 2. A foamed refractory paint wherein the flame retardant is tris (tribromoneopentyl) phosphate and / or a condensate thereof.