Precipitated silica

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

Process for synthesizing nanosize silica particles

Abstract: A method for synthesizing nano-sized silica particles is provided to obtain silica having a particle size of 50-800nm. A method for synthesizing nano-sized silica particles comprises the following steps of adding sodium silicate is added to HCl of 0.1-0.3N so that pH can be within a range of 3-7, in the room temperature and precipitating silica gel; removing NaCl components by washing/filtering precipitated silica gel; and By using the bead mills, the silica gel from which the NaCl components is removed is pulverized at a pulverizing speed of 2000-6000rpm so as to become particles of nano size.

Tire using tread comprising highly silica-containing rubber for performance for winter season

Abstract: PROBLEM TO BE SOLVED: To provide a tire having a tread aiming performances for winter season. SOLUTION: The tire tread comprises reinforcing fillers comprising precipitated silica having a low BET nitrogen specific surface area and optionally carbon black for reinforcing rubber, and a compatible rubber compound comprising at least 40 phr of cis-1,4-polybutadiene rubber and high vinyl content SBR produced by specified solution polymerization. The compatibility of a combination of BR having -100°C or lower relatively low glass transition temperature (Tg) with HVS-SBR having at least 30°C or higher relatively high Tg (thereby, the difference of Tg is at least 70°C) is promoted by a high HVS-SBR vinyl content of about 40 to 50 percent on the basis of the polybutadiene component. COPYRIGHT: (C)2008,JPO&INPIT

Process for producing chemically treated amorphous precipitated silica

Abstract: Described is an improved process for producing chemically treated fillers by using a certain combination of functionalizing and hydrophobizing agents in an aqueous suspension of inorganic oxide having a pH of 2.5 or less and increasing the pH of the suspension after chemically treating the filler.

Synthesis of precipitated silica from sodium silicate solution by carbonation method

Abstract: A method was proposed for the preparation of silica powders using sodium silicate as the silica source and carbon dioxide and hydrochloric acid as precipitating reagents. The effect of reaction temperature (20, 40, 60, and 80 °C) and SiO2 concentration in sodium silicate solutions (4, 6, 8, and 10 %) on silica morphology, dibutyl phthalate absorption, aggregate size distribution, and dispersion ability (agglomerates fragility) were investigated. The best properties of silica powder were achieved at reaction temperature 40 °C and SiO2 concentration 8 %. The properties of the silica sample obtained at optimal conditions were compared with properties of high-quality commercial silica used as rubber reinforcing filler. Also, the vulcanization characteristics and mechanical characteristics of rubber composites containing these two silica fillers were investigated. It was found that silica filler with excellent properties can be produced using the proposed method, while by tuning temperature and precursor concentration, the silica properties that are important for its reinforcing potential may be closely controlled.

Method for preparing precipitated silica

Abstract: The invention relates to a method for preparing precipitated silica in which: (i) a starter, having a pH of 2 to 5, is prepared; (ii) a silicate and acid are simultaneously added to the starter such that the pH of the reaction medium is between 2 and 5; (iii) a silicate is added until a pH of 7 to 10 is reached; (iv) a silicate and acid are simultaneously added such that the pH is between 7 and 10; (v) an acid is added until a pH of 2.5 to 5.3 is reached; and (vi) the reaction medium is placed in contact with an acid and silicate such that the pH is between 2.5 and 5.3, wherein the acid used in at least one of the steps of the method is a concentrated acid.