Topic
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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Patent•
23 Oct 1978
TL;DR: In this article, a polyether composed of chemically-bonded recurring units that are constituted by a main chain represented by -R 1 -O-(R 1 is a divalent alkylene) and carry at least one hydrolyzable silicon group of formula (R 1, O is an univalent hydrocarbon group having 1W12C, selected from alkyl and aryl), with a fine silica powder having an average particle size ≤5μ, such as silica aerogel, precipitated silica, and a plasticizer, followed by
Abstract: PURPOSE: To give the title composition with excellent machanical properties, comprising a ≥1 hydrolyzable silicon group-carrying polyether with a specific molecular weight and a fine silica power. CONSTITUTION: The objective composition can be obtained by incorporating (A) a polyether composed of chemically-bonded recurring units that are constituted by a main chain represented by -R 1 -O-(R 1 is a divalent alkylene) and carry at least one hydrolyzable silicon group of formula (R 1 is a divalent alkylene) and carry at least one hydrolyzable silicon group of formula (R 2 is an univalent hydrocarbon group having 1W12C, selected from alkyl and aryl; X is hydride, halogen, alkoxy, acyloxy, ketoximate, amide, acid amide, aminoxy, or mercapto; a is 0W2), with (B) a fine silica powder having an average particle size ≤5μ, such as silica aerogel, precipitated silica, (C) a silanol condensation catalyst, and (D) a plasticizer, followed by adjusting the viscosity of the resulting composition to give a value of 100,000W500,000 poises. Said polyether has a molecular weight of 300W15,000. COPYRIGHT: (C)1980,JPO&Japio
4 citations
Patent•
01 Aug 2002
TL;DR: In this paper, a mixture of organopolysiloxane derivatives and precipitated silica is used to produce a high whiteness and can be well blended in a compounded silicone rubber.
Abstract: PROBLEM TO BE SOLVED: To provide a hydrophobic precipitated silica which has a high whiteness and can be well blended in a compounded silicone rubber, and also to provide a method for production thereof and the use thereof. SOLUTION: This hydrophobic precipitated silica is produced by (a) preparing a mixture comprising an organopolysiloxane derivative and a precipitated silica, and (b) carrying out the conditioning of the mixture at a temperature of 10-150°C for 0.5-72 h. COPYRIGHT: (C)2003,JPO
4 citations
Patent•
17 Sep 1997
TL;DR: In this paper, the authors proposed a rubber composition comprising an elastomer having a specific composition, a filler comprising precipitated silica and carbon black, and a coupler for the silica, excellent in strength and abrasion resistance and useful for tires having treads.
Abstract: PROBLEM TO BE SOLVED: To obtain a rubber composition comprising an elastomer having a specific composition, a filler comprising precipitated silica and carbon black, and a coupler for the silica, excellent in strength and abrasion resistance and useful for tires having treads. SOLUTION: This rubber composition comprises (a) 100 pts.wt. (phr) of elastomers comprising (i) 50-98phr of an elastomer selected from isoprene polymer, 1,3-butadiene polymer, their copolymer, and a isoprene-1,3-butadiene-styrene or α-methylstyrene terpolymer and (ii) 2-50phr of a triblock elastomer having an arrangement of the formula: A-B-A and composed from terminal polystyrene hard segments A and an inner dienic elastomer soft segment B, (b) 20-150phr of a filler comprising particulate precipitated silica and carbon black, containing the silica in an amount of 10-100phr and having a silica/carbon black weight ratio of 1/1, and (c) a coupler for the silica. COPYRIGHT: (C)1998,JPO
4 citations
TL;DR: In this article, the effect of Y 2 O 3 on the sintering behavior of mullite compacts was investigated and it was shown that rapid mullitization occurred through nucleation and normal grain growth due to the formation of yttrious silicate glassy phase.
4 citations
TL;DR: In this article, an organic-inorganic hybrid intumescent flame retardant coatings (IFRCs) is used to obtain an efficient and ecological strategy to obtain excellent fireproof performance.
Abstract: The organic-inorganic hybrid intumescent flame retardant coatings (IFRCs) is an efficient and ecological strategy to obtain excellent fireproof performance. The benign design on aliphatic waterborne polyester (AWP)-based IFRCs is modified by silicon-based aerogels and aluminum powder simultaneously, which is characterized by various techniques to explore the flame retardant mechanism. The results show that an appropriate precipitated silica aerogel (0.45 wt%) and aluminum powder (0.8 wt%) impart synergetic flame-retarding and smoke suppression effect to the AWP-based IFRCs, evidenced by the reduced fire growth index of 0.50 from 0.63 kW m−2 s−1, as well as the raised flame retardancy index of 2.52 from 1. Because the labyrinth barrier effect of amorphous silica-alumina gels derives from the in-situ cross-linking between the active Si(OH)4 and AlOOH or Al(OH)3, as well as the enhanced adhesive property between silanols and plywood surface, which facilitates the ceramic-like charring of AWP-based IFRCs, leading to the formation of continuous and tortuous char. It expands the design methods and flame-retarding mechanism of ecological organic-inorganic hybrid IFRCs.
4 citations