| 摘要 |
<p>1,141,213. Hydrophobic phosphorus. KNAPSACK A.G. 5 June, 1967 [24 June, 1966], No. 25851/67. Heading C1A. A stabilized hydrophobic red phosphorus is made by treating an aqueous suspension of red phosphorus with Mg(OH) 2 or Al(OH) 3 , precipitated in situ, as stabilizer, immediately treating the stabilized red phosphorus with an aqueous dispersion of a liquid paraffin, a wax, or an organo-silicon compound, containing 0À2% to 5À0% by weight of the hydrophobic or agent, referred to the weight of phosphorus used, filtering the mixture obtained and drying the filter cake, preferably at 100‹ to 135‹ C., if desired under reduced pressure, to give a substantially dry product. The hydrophobic agent is one capable of producing stable dispersions in water and stable at pH values of up to 11. If the stabilizing agent is Mg(OH) 2 0À6% by weight calculated as MgO is the preferred amount; if Al(OH) 3 , 1À5- 2À0% by weight is preferred. The preferred amount of a liquid paraffin or a wax is 0À9% to 1À8% by weight; that of an organosilicon compound is 0À6% to 1À2% by weight. The aqueous dispersion of hydrophobic agent preferably contains 30 to 45% by weight of hydrophobic material. The organo-silicon compound may be a silicone, siloxane or silane.</p> |
