What material is really called fireproof paint? How does the fireproof coating fireproof? What is the role of fire retardant coatings in a fire? Several extra-large fires have pushed fire-retardant paint to the cusp of the storm. Below, Xiao Bian carries out the fire protection mechanism of two kinds of fire-retardant coatings.
The fire protection mechanism of the intumescent fire retardant coating consists in that when the finish of the fire retardant coating is exposed to flame, the foaming component in the coating film is thermally decomposed to form a heat-insulating spongy foam layer, which prevents the propagation of the flame. The fire-retardant additives in paints are mainly foaming components, including carbon sources, foaming agents and organic nitrogen compounds, which can be used in combination.
In the composition of non-intumescent fire-retardant coatings must contain flame-retardant (fire-retardant), such as phosphorus-containing, halogen-containing organic compounds (such as decabromodiphenyl ether), sodium borate, and antimony trioxide. Sodium borate is particularly suitable for use as a flame retardant for vinyl acetate-based emulsions. The amount of sodium borate is preferably 10% to 10%, preferably 40% to 60% of the polymer. The antimony trioxide itself is not very flame-retardant, but when it is in the initial stage of combustion, it can be born with antimony trichloride. For example, in the case of chlorinated paraffin, superior flame-retardant capability is exhibited.
In order to obtain excellent fire prevention performance, in addition to adding flame retardants, the choice of base material is also important. Because halogens (generally chlorine and bromine) and phosphorus are very effective in improving fire resistance, it is best to use binders containing these elements. For example, vinyl chloride or vinylidene chloride copolymer emulsions or chlorinated rubber emulsions are the most preferred binders. In addition, trimethyl phosphonate and beta-trichloroethylene phosphate are selected as flame retardant plasticizers.
The fire protection mechanism of the intumescent fire retardant coating consists in that when the finish of the fire retardant coating is exposed to flame, the foaming component in the coating film is thermally decomposed to form a heat-insulating spongy foam layer, which prevents the propagation of the flame. The fire-retardant additives in paints are mainly foaming components, including carbon sources, foaming agents and organic nitrogen compounds, which can be used in combination.
In the composition of non-intumescent fire-retardant coatings must contain flame-retardant (fire-retardant), such as phosphorus-containing, halogen-containing organic compounds (such as decabromodiphenyl ether), sodium borate, and antimony trioxide. Sodium borate is particularly suitable for use as a flame retardant for vinyl acetate-based emulsions. The amount of sodium borate is preferably 10% to 10%, preferably 40% to 60% of the polymer. The antimony trioxide itself is not very flame-retardant, but when it is in the initial stage of combustion, it can be born with antimony trichloride. For example, in the case of chlorinated paraffin, superior flame-retardant capability is exhibited.
In order to obtain excellent fire prevention performance, in addition to adding flame retardants, the choice of base material is also important. Because halogens (generally chlorine and bromine) and phosphorus are very effective in improving fire resistance, it is best to use binders containing these elements. For example, vinyl chloride or vinylidene chloride copolymer emulsions or chlorinated rubber emulsions are the most preferred binders. In addition, trimethyl phosphonate and beta-trichloroethylene phosphate are selected as flame retardant plasticizers.
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