Precipitated silica

About: Precipitated silica is a research topic. Over the lifetime, 1401 publications have been published within this topic receiving 20992 citations.

Cold resistant cable sheath material

Abstract: The invention discloses a cold resistant cable sheath material. The cable sheath material is composed of the following raw materials comprising, by weight, 50-60 parts of chlorinated polyethylene, 10-15 parts of silicone rubber, 2-4 parts of polyacrylate, 0.5-1.5 parts of antioxidant NBC, 1-2 parts of antioxidant MB, 0.5-1 parts of cross-linking agent TAIC, 2-4 parts of zinc stearate, 0.5-1 parts of anti-oxidant 1010, 0.4-0.8 parts of anti-oxidant DLTP, 3-5 parts of glycerol monostearate, 20-30 parts of modified aluminium hydroxide, 4-6 parts of precipitated silica, 30-40 parts of light calcium carbonate, 40-50 parts of coated wollastonite powder, 1-2 parts of alkyl glucoside, 1-2 parts of magnesium oxide, 1-4 parts of 1,3,5-triallylisocyanuric acid and 1-2 parts of sulphur.

Preparation and characterization of functionalized precipitated silica SYLOID® 244 using ionic liquids as modifiers

Abstract: Studies were performed on the chemical modification of SYLOID® 244 (Grace) precipitated silica using ionic liquids. The unmodified and ionic-liquid-functionalized silica were subjected to a comprehensive physicochemical and dispersive evaluation. Particle size, polydispersity and specific surface area (BET) and porous structure were examined. Moreover, stability of the colloids obtained was evaluated by estimation of isoelectric points. The extent of modification and its type were defined using fourier transform infrared spectroscopy and 29Si-cross-polarization/magic angle spinning/nuclear magnetic resonance techniques. The modification was not observed to deteriorate the dispersive properties of the silica. The silicas obtained exhibited a restricted tendency to form larger accumulations of particles, i.e. aggregates and agglomerates. Moreover, application of ionic liquids with a heptyloxymethyl or octyloxymethyl substituent resulted in complete hydrophobization of the silica surface. Tested powders manifested the highest stability within a pH range of 10–12. Copyright © 2004 John Wiley & Sons, Ltd.

Silane modified fillers for reinforcing polymers

Abstract: Some white natural fillers (kaolin and talc) and synthetic mineral ones (precipitated silica, sodium-aluminium silicate, zinc silicate, calcium silicate) together with waste materials (cement dusts and post-fluor silicas) were subjected to surface modification and characterised. Various types of silane coupling agents (amino-, mercapto-, methacryloxy- and ureidosilanes) were used for surface modification. The modified fillers were mixed with butadiene-styrene rubber, polyurethane and PVC. Good physico-mechanical properties were obtained for PVC containing talcs and kaolins modified with methacryloxy- and ureidosilanes. The strength of polyurethanes was increased most by modification of the fillers with mercapto- and aminosilanes.

Preparation of precipitated silicas useful as fillers in silicon matrices

Abstract: Carboxylic acids are employed during the preparation of precipitated silica or a suspension of precipitated silica to provide precipitated silicas with low water uptake, which are useful, for example, as reinforcing fillers for silicon matrices.

Process for refining glyceride oil using precipitated silica

Abstract: The invention relates to a process for refining glyceride oil comprising the steps of contacting the oil with amorphous silica, wherein said silica is selected from the group of precipitated amorphous silicas having a surface area of at least 400 m2 /g in pores with a diameter from at least 2 nm. Preferably said precipitated amorphous silicas have a pore volume in the range of about 1.3 to 2.5 ml/g, in pores having a pore diameter in the range of 3.6 to 1000 nm.