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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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Patent
Brian P. Carney1
12 Nov 2003
TL;DR: In this article, aqueous adhesives compositions which emit low residual formaldehyde and suitable for bonding rubbers to a metal substrate under pre-bake conditions are presented, which can be obtained in single coats resulting in rubber-tear failure from the rubber-metal bond.
Abstract: Disclosed are aqueous adhesives compositions which emit low residual formaldehyde and suitable for bonding rubbers to a metal substrate under pre-bake conditions. The adhesive composition comprises a phenolic novolak, acid acceptor and chlorinated natural rubber, absent an organic crosslinker. Preferably the adhesive further comprises precipitated silica and/or carbon black. Also disclosed are composites of rubber bonded to metal, such as seals, gaskets, and linings Effective bonds possessing excellent environmental resistance can be obtained in single coats resulting in rubber-tear failure from the rubber-metal bond.

4 citations

Patent
20 Apr 2018
TL;DR: In this paper, a preparation method of precipitated silica reinforced silicon rubber is described, in which the silicon rubber material is prepared from the following raw materials in parts by weight: 100 parts of raw rubber of methyl vinyl silicone rubber, 40 to 50 parts of white carbon black, 3 to 3.6 parts of structurized controlling agents, 0.3 to 0.8 part of hydrogen-containing silicone oil and 0.4 part of mold releasing agents.
Abstract: The invention discloses a preparation method of precipitated silica reinforced silicon rubber. The preparation method is characterized in that the silicon rubber is prepared from the following raw materials in parts by weight: 100 parts of raw rubber of methyl vinyl silicone rubber, 40 to 50 parts of precipitated silica reinforced white carbon black, 3 to 3.6 parts of structurized controlling agents, 0.3 to 0.8 part of hydrogen-containing silicone oil and 0.2 to 0.4 part of mold releasing agents. According to the preparation method, firstly, the weighed raw materials of 100 parts of raw rubberof raw rubber of methyl vinyl silicone rubber, 0.2 to 0.4 part of mold releasing agents and 0.3 to 0.8 part of hydrogen-containing silicone oil are fed into an internal mixer; then, 40 to 50 parts ofwhite carbon black are added into the internal mixer in three to five times; 3 to 3.6 parts of hydroxyl silicone oil are added; then, mixing and kneading are performed; the temperature is controlledto be 50 to 80 DEG C; after the internal mixing conglobation and still standing, the temperature is raised; vacuum pumping is performed; finally, the silicon rubber materials subjected to the vacuum pumping are subjected to remilling on a milling machine; after the rubber materials are smooth, filtering and packaging are performed to obtain a product. The preparation method has the advantages thatthe production process is simple; the tearing intensity is high; the effect is good, and the like.

4 citations

Journal ArticleDOI
TL;DR: In this article, the authors used ionizing radiations from a 60-Co source for inducing radical reactions finally leading to the grafting of unsaturated olygomers and vinyl monomers onto the surface and micropores of precipitated silica Zeosil 116 5 (150- 170 m 2 /g).
Abstract: Ionizing radiations from a 60-Co source have been employed for inducing radical reactions finally leading to the grafting of unsaturated olygomers and vinyl monomers onto the surface and micropores of precipitated silica Zeosil 116 5 (150- 170 m 2 /g). The target was to obtain modified silica with enhanced polar compatibility with respect to polybutadiene and styrene-butadiene copolymers rubber matrices and suited to favour the formation of chemically bound rubber in a vulcanization process. The latter property was expected to follow from the characteristics of free radical reactivity arising from the unsaturations present in the organic coating. Three classes of modified silica have been prepared: A)silica coated with polybutadiene olygomers with M n in the range 1000-5000 and having a different relative content of 1,4-cis, 1 , 4 -trans and vinyl double bonds [1,2] ; B)Silica coated with polybutadiene olygomers further modified by subsequent grafting of styrene monomer. The type A samples were obtained by γ irradiation under vacuum of silica samples preimpregnated with the oligomers in the dose range up to 30-200 kGy. Type B samples were obtained via three different steps as outlined in the scheme below: SiO 2 (PB) γ vacuum→/298K SiO 2 -PB γ air→/298K SiO 2 -PB-OOH Fe 2+ →/Sty SiO 2 -PB-O-PS The characterization of the modified silica was carried on by elemental and thermogravimetric analysis, FTIR (diffuse reflectance), Raman spectroscopy, inverse gas chromatography (IGC), CP/MAS 29-Si NMR, granulometry and TEM microscopy.

4 citations

Patent
07 Feb 2003
TL;DR: In this paper, a method for producing a lead acid battery that operates on the oxygen cycle is disclosed, which includes the steps of assembling a cell comprising a positive plate, a negative plate, and a sheet of separator material which is an absorbent, porous filtration medium, so that there is free space between the plates and surfaces of the separator, inserting the cell into a case, introducing into the case a mixture of sulfuric acid and silica including silica from a never dried precipitated silica slurry, causing the sulphuric acid in the mixture
Abstract: A method for producing a lead acid battery that operates on the oxygen cycle is disclosed. The method includes the steps of: assembling a cell comprising a positive plate, a negative plate, and a sheet of separator material which is an absorbent, porous filtration medium, so that there is free space between the plates and surfaces of the separator, inserting the cell into a case, introducing into the case a mixture of sulfuric acid and silica including silica from a never dried precipitated silica slurry, causing the sulfuric acid in the mixture in the free space to gel, and sealing the case. The sulfuric acid in the mixture in the free space can be caused to gel by an increase in the silica content thereof, by an increase in the specific gravity thereof, or by both an increase in the silica content thereof, and an increase in the specific gravity thereof.

4 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20236
202217
202118
202030
201931
201841