GB1498030A - Inorganic-organic plastics - Google Patents

Abstract

1498030 Polyurea xerosols BAYER AG 27 Nov 1974 [30 Nov 1973] 51353/74 Heading C3R A xerosol is obtained by mixing (a) an organic water-insoluble polymer precursor of which at least 0À5 wt. per cent is an isocyanate with (b) an aqueous solution or polymer dispersion containing more water than is required to react with the isocyanate in (a) and one or more substances capable of binding water by gel-formation or solid hydrate formation due to reaction with CO 2 , cooling, or loss of water by reaction with other components, not more than 70 wt. per cent of (b) being alkali metal or ammonium silicate, and optionally (c) one or more hardeners for (a) and/or (b), and optionally (d) one or more additives, to form a dispersion of an aqueous phase in an organic phase, and allowing the dispersion to react to form a xerosol. Besides isocyanate, (a) may contain other polymer precursors, e.g. aminoplast or phenoplast precondensates, epoxy resins and addition polymerizable monomers, notably unsaturated polyester compositions. The solute in (b) may react with CO 2 to form a gel (e.g. alkali metal silicates and aluminates) or hydrate (e.g. NaOH), or form crystals by cooling (e.g. Na 2 CO 3 , Na 2 SO 4 and alum) or concentration (e.g. CaCl 2 ); concentrated industrial waste solutions may be used; suitable gel-forming soluble polymer precursors include soluble aminoplast, phenoplast, epoxy resin, polyurethane and polyurea precursors. In examples there are prepared first components containing 150 g. of a sulphonated dimer-reduced crude phosgenated aniline-formaldehyde condensate (or, in Ex. 10, 50 g. of this with 100 g. of an unsaturated polyester/styrene mixture and a peroxy catalyst), and optionally 30 g. of a phenolic resin and 10 g. of a sulphonated phenolic resin (Ex. 9), 5-25 g. of CFCl 3 , 50 g. of cement (Ex. 3), and fire retardants (20 g. of trichloroethyl phosphate in Ex. 13, 30 g. of chlorinated paraffin in Exs. 19 and 20, and second components containing 100 g. of 50% aqueous sodium hexametaphosphate (Ex. 13), saturated Na 2 CO 3 (Exs. 5 and 8), 20 or 30% aqueous sodium aluminate (Exs. 6, 7, 9, 11, 12 and 13), or mixtures of 44% water glass with the hexametaphosphate alone (5 : 5 or 6 : 4 wt. ratio, Exs. 2 and 4) or with 50% urea solution (2 : 5 : 3, Ex. 10), or 150 g. of mixtures 54% water glass with 50-60% urea or saturated trisodium phosphate/urea solution, optionally together with 0À5-2 g. of triethylamine, 0À1 g. of an emulsifier, and 50 or 100 g. of cement. On mixing the components hard solid or foamed bodies are formed.