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Precipitated silica
About: Precipitated silica is a research topic. Over the lifetime, 1401 publications have been published within this topic receiving 20992 citations.
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TL;DR: In this article, a method was proposed for the preparation of silica powders using inexpensive material of sodium silicate (Na(2)SiO(3)) and carbon dioxide (CO(2)) by pressured carbonation, in which carbon dioxide acted as a precipitating reagent.
70 citations
Patent•
01 Sep 1998TL;DR: In this paper, a method for the preparation of hydrophobic precipitated silicas which are useful, for example, as reinforcing fillers in rubber compositions is presented, where in the first step an aqueous suspension of precipitated liquid is contacted with an organosilicon compound in the presence of a catalytic amount of an acid to effect hydrophobing of the precipitated fluid.
Abstract: A method for the preparation of hydrophobic precipitated silicas which are useful, for example, as reinforcing fillers in rubber compositions. The method comprises two steps, where in the first step an aqueous suspension of precipitated silica is contacted with an organosilicon compound in the presence of a catalytic amount of an acid to effect hydrophobing of the precipitated silica. In the second step the aqueous suspension of the hydrophobic precipitated silica is contacted with a water-immiscible organic solvent at a solvent to silica weight ratio greater than 5:1 to effect separation of the hydrophobic precipitated silica from the aqueous phase.
70 citations
TL;DR: In this paper, the morphology and mechanical properties of polypropylene/elastomer/silica composites were investigated with the aim of improving stiffness and impact resistance, and the effect of adding the polymeric compatibilizers was assessed by morphology studies, thermal analysis and mechanical testing.
68 citations
Patent•
18 Apr 1986TL;DR: Precipitated amorphous silica useful for manufacturing microporous battery separators is prepared by establishing an aqueous solution of alkali metal silicate having an alkali-oxide concentration of (a) from 21-26 grams per liter and a temperature of from about 179° F to 186° F, or (b) from 56 to 72 grams perliter and an aperature of from 190° to 198° F as discussed by the authors.
Abstract: Precipitated amorphous silica useful for manufacturing microporous battery separators is prepared by establishing an aqueous solution of alkali metal silicate having an alkali metal oxide concentration of (a) from 21-26 grams per liter and a temperature of from about 179° F to 186° F, or (b) from 56 to 72 grams per liter and a temperature of from 190° to 198° F; adding from (a) 145 to 19 times or (b) 2 to 5 times respectively the amount of alkali metal silicate initially present in the initial aqueous solution simultaneously with acidifying agent, eg, sulfuric acid, to the initial aqueous solution while maintaining the initial alkali metal oxide concentration therein substantially constant; reducing the pH of the resulting slurry to from 8 to 9; ageing the slurry at precipitation temperatures for from 15 to 90 minutes; reducing the pH of the aged slurry to from 38 to 47 and then recovering, eg, separating, the silica from its entraining slurry, washing the recovered silica, and drying the washed precipitated silica Optionally, the recovered and dried silica is milled after drying to produce a product having a median agglomerate particle size of from 6 to 15 micrometers
66 citations
TL;DR: In this paper, the authors used photon correlation spectrometry (PCS) to determine the hydrodynamic layer thicknesses of polyethylene oxides (PEO) adsorbed on precipitated silica particles.
66 citations