JPS5936169A - Intumescent coating - Google Patents

Abstract

PURPOSE:To obtain titled coating with high fire and water resistance, for use in the fireproof coating for wood, etc., by incorporating a composition comprising a hydroxyl group-contg. liquid as a vehicle, phsphoric acid compound, amine, polyhydric alcohol, and phosphoric acid salt-based frit, with, as a curing agent, an isocyanate of polyphenyl structure. CONSTITUTION:The objective coating can be obtained by incorporating (1) the chief agent consisting of (A) a hydroxyl group-contg. liquid (e.g., castor oil) as a vehicle, (B) a phosphoric acid compound (e.g., polyphosphoric acid amide), (C) an amine (e.g., dicyandiamide), (D) a polyhydric alcohol (e.g., dipentaerythritol), and (E) <=20wt% based on the resulting coating film composition, of a phosphoric acid salt-based frit with a melting point of, pref. 500 deg.C or lower, with (2) as a curing agent, an isocyanate of polyphenyl structure in such an amount, for example, that the equivalent ratio of the hydroxyl group of the component (A) to the isocyanate falls between 1/1 and 1/1.2. USE:For fireproof coating for plastics and equipment and materials to be often exposed to water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a foamed fire protection coating, particularly one having improved bulk resistance and water resistance.

It is generally known to apply intumescent fire-retardant paints to provide fire-retardant protection to combustible wood or plastic.

Examples of this include vinyl acetate emulsion, ammonium phosphate, dicyanide, and amine 1? , and those with added ntaerythritol. However, these compounds are generally hydrophilic and have poor water resistance because the emulsion as a vehicle contains a surfactant.

Acrylic resin base solvent-based products have improved water resistance compared to emulsion-based products, but the vehicle itself melts when it comes into contact with high-temperature water such as boiling water or steam, so it can withstand use for only one minute. It's not a thing.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a foam-type fireproofing paint with excellent fire resistance and water resistance.

That is, the gist of the present invention is to use a hydroxyl group-containing liquid material as a paint vehicle, cure it with a polyphenyl structure isocyanate, and add a phosphoric acid compound, an amine compound, a polyhydric alcohol, and a phosphate frit as additives. .

Hydroxyl group-containing liquid materials include zoropylene glycol, propylene oxide for bisphenol, propylene oxide adduct of glycerin, castor oil, and hydroxyl group-terminated polybutadiene, with castor oil being preferred in terms of water resistance.

Examples of the polyphenyl structure incyanate include diphenylmethane dicyanate 1 polymethylene polyphenyl polyisonanate. The reason why we limited the curing agent to polyphenyl structure isocyanate is that it easily carbonizes during combustion and is suitable as a component of foam-type fire protection paint.

Hydroxyl group-containing liquid material and l? The compounding ratio of the phenyl structure ynoneane-1- is preferably 1:1 to 1.2 in terms of hydroxyl group equivalent: iso/anate group equivalent.

Ammonium polyphosphate, polyphosphoric acid amide, and melamine phosphate are suitable for the phosphoric acid compound as a component that imparts fire retardancy.

Polyphosphoric acid amide and melamine phosphate have better water resistance than ammonium polyphosphate. However, in order to achieve a fire retardance of 4"l, it is necessary that the coating composition contains 1) 205 in an amount of 15% or more, and therefore P20 s
It is also effective to supplementally use ammonium polyphosphate with a large content.

Pentaerythritol is a polyhydric alcohol.

) Intererythritol is al.

Nopentaerythritol, which has a larger molecular weight, has better water resistance.

As the amine compound, nocyanoamide IS and melamine are effective.

Phosphate frit is effective in improving the strength of the foamed carbonized layer. Phosphate frit is 1: component is P2O5+
klz03, 5i02, B2O3+ KNaO
It is suitable to have a melting point of 500C or less.

The amount of phosphate frit added should be limited to less than 20% of the coating composition. When the amount of inorganic components increases in a foaming type fire protection paint composition, the foaming ratio and strength decrease.

As other paint components, halogen compounds such as chlorinated nomurafin and decabromodiphenyl ether, and antimony trioxide may be added for the purpose of improving flame retardancy. Titanium white still as pigment.

Car+1? A coloring agent such as black may be added.

A solvent is used to adjust the viscosity of the paint, and for this purpose, an aliphatic hydrocarbon, an aromatic hydrocarbon, a solvent, or a mixed solvent thereof is used.

Usually, a main agent consisting of a hydroxyl group-containing liquid material containing a phosphoric acid compound, an amine compound, a polyhydric alcohol, and a phosphate frit is mixed with a curing agent having a polyphenyl structure of 1:1 and a hardening agent having a polyphenyl structure of 1:1. After stirring, apply to the object to be coated, dry and harden at room temperature.

Examples of the present invention will be described below.

Table 1 [The main ingredients in the formulations not shown are mixed using a stirrer, and then the powder is pulverized using a Zeel mill. Next, add a hardening agent to this main ingredient, stir well, and then make a 220 tu x 220 m
It was applied at a ratio of 35,087 coats to 12 coats of plywood with a thickness of 4 mm and a thickness of 4 mm, and was dried and cured at room temperature. After 48 hours of use, the following tests were conducted. In accordance with JTSA1321 [Flame Retardant Test Method for Building Interior Materials and Construction Methods], a 6-minute heating test was conducted for 1 j, and as a result, a foam insulation layer of approximately 30 mm was formed and there was no afterflame. No cracks or penetrations were observed in the plywood, indicating good fire resistance7.

Also, length 2001nln x width 100 +nm x thickness 1
The paint was applied to a 71+111 polyzolopyrene plate by the method described above, and dried and cured. This test piece was immersed in 100C boiling water for 1 hour, and changes in the coating film were observed. As a result, there was no cracking or falling off of the coating film, and it showed good water resistance.

On the other hand, the foaming type fireproofing paint based on vinyl acetate emulsion in ethylene of Comparative Example 1 has excellent fire resistance, but the paint film falls off in boiling water at 100'C. Further, the foamed acrylic resin solvent-based foam No. 5"! Fireproofing material of Comparative Example 2 had good fire resistance, but the coating film melted and deformed in 100C boiling water, and the coating surface became rough.

Table 1 As explained above, the foaming type fire-retardant paint of the present invention has a paint vehicle and a hydroxyl solution; It is a mixture of alcohol and phosphate frit and uses polyphenyl isoneanate as a hardening agent.It has excellent fire resistance and water resistance, and is fireproof protection for equipment or materials that are easily exposed to moisture. ``It is useful as an advantage.

Procedural amendment (KK) 1. Indication of matter f: Showa era! 7th Year Lucky ST-Gan No. /4C6QDe3
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Claims (1)

[Claims] A characteristic feature is that a phosphoric acid compound, an amine compound, a polyhydric alcohol, and a phosphate frit are mixed as components that impart fire retardancy to a hydroxyl group-containing liquid material as a paint vehicle, and a polyphenyl structure insearite is used as a curing agent. Foaming type fire-retardant paint.