| 摘要 |
A method for controlling the spread of fire in burning flammable materials comprises coating the surfaces of combustible material adjacent to said burning flammable materials with a particulate coating composition of water-swollen gelled particles of a cross-linked water-insoluble water-swellable polymer, said polymer constituting from 0.01 weight per cent to 5.0 weight per cent of said coating compositions. Suitable polymers include crosslinked salts of polyacrylic, polymethacrylic, polysulphoethylacrylic and polysulphoethylmethacrylic acids, crosslinked polyglycols, polysodium styrene, sulphonate, sulphonated polyvinyl toluene salts, copolymers of these sulphonated aromatic compounds with acrylates, methacrylates, acrylonitride or alkyl acrylonitriles, polyvinyl alcohol, polyacrylamide, copolymers of acrylamide with acrylic acid or its salts, polyvinyl morpholine, poly-5-methyl-N-vinyl-2-oxazolidinone and polyvinyl pyrrolidone. The polymers may be cross-linked chemically e.g. with methylenebisacrylamide or by means of ionizing radiation. Examples are given of the use of aqueous compositions containing acrylic polymers for coating wooden panels to fireproof them. |
