| 摘要 |
<p>1524266 Phenolic resin foam compositions RHONE-POULENC INDUSTRIES 23 Sept 1976 [23 Sept 1975 (2)] 39544/76 Heading C3C A load-bearing, insulating and/or fire-guard building material comprises 10-80% by vol. of expanded inorganic particles of 2-30 mm. diameter and 20-90% by vol. of a phenolic resin foam together with 30-80 parts by wt., 100 parts of foam, of a hydrated or non- hydrated calcium sulphate. The material is made by casting or injecting in a mould containing the inorganic expanded particles a mixture of a 100 parts by wt. phenolic resin having a water content of 10-40% by wt. and a formaldehyde : phenol molar ratio of 1 : 1 to 3 : 1, 5-30 parts by wt. of an acid, 30-80 parts by wt. of the calcium sulphate of a grain size less than 1 mm. and not more than 8 parts by wt. of a blowing agent which is a chlorinated or chlorofluorinated hydrocarbon, an alkali, alkaline earth metal or ammonium sulphide, carbonate or bicarbonate, or a nitrogen compound that evolves nitrogen on heating. The blowing agent may be absent when natural plaster is used as the calcium sulphate since that contains carbonates which liberate CO2 with acids. In the example expanded clay or glass spheres are placed in a heated mould and a mixture of a resin, natural plaster or phosphogypsum, a phenolsulphonic acid and optionally NaHCO3 was injected into the mould to form foams.</p> |
