| 摘要 |
<p>The composition comprises a pyrogenically produced silicon dioxide powder in the form of aggregates of primary particles. The composition has a BET surface area of 150+-15 m 2>/g and the aggregates display an average surface area of 12000-20000 nm 2>, an average equivalent circle diameter (ECD) of 90-120 nm and an average circumference of 1150-1700 run. Independent claims are included for the following: (1) process for production of silicon dioxide powder. A mixture of silicon compound is evaporated separately or together, the vapors are transferred by carrier gas to a mixing chamber with silicon tetrachloride in an amount of 60-95 wt.% as first component, second component selected from H 3SiCl, H 2SiCl 2, HSiCl 3, CH 3SiCl 3, (CH 3) 2SiCl 2, (CH 3) 3SiCl.(n-C 3H 7)SiCl 3 in an amount of 5-40 wt.%. A combustion gas and primary air which can optionally be enriched with oxygen and/or preheated, are transferred separately to mixing chamber. The mixture of vapor of silicon chloride, combustion gas and primary air, is ignited in a burner and flame is introduced into reaction chamber. Secondary air which surrounds the flame is introduced into the reaction chamber; (2) use of the composition as a filler in rubber and plastics, to adjust the rheology in paints and coatings, as a support for catalysts and to produce dispersions; (3) silicone sealing compound comprising the composition; (4) filler in rubber and plastic comprising the composition; (5) method for adjusting the rheology of paints and coatings comprising adding the composition; (6) catalyst support comprising the composition; (7) method of producing dispersions comprising adding the composition to a mixture comprising a liquid and particles; (8) dispersion comprising the composition; and (9) method for producing a rubber or plastic.</p> |
