| 摘要 |
<p>A process for stabilizing by encapsulation red phosphorus in powder for using it as flame retardant for polymeric materials, consisting in preparing a red phosphorus dispersion in an aqueous solution of a melamine condensate cationized with a mineral acid, consisting of melamine, formaldehyde, triethanolamine and a monohydroxyl alcohol having a number of carbon atoms lower than 5, in heating the aforesaid dispersion, under stirring, at 80-100°C in order to precipitate said condensate in the form of a melaminic resin partially cross-linked around the individual red phosphorus particles which are so stabilized by a continuous and compact layer of said resin, then in completing the cross-linking of same in a final dehydration step by drying at 80-130°C.</p> |
