摘要:
A conductive silicone rubber composition comprising (A) an organopolysiloxane, (B) conductive carbon black, and (C) an organic peroxide is improved in shelf stability by adding (D) a fatty acid or an acid anhydride thereto. The composition is subject to atmospheric hot air vulcanization to form a conductive silicone rubber having improved conductivity and physical properties.
摘要:
A novel method is proposed for the effective utilization of scraps of cured silicone rubbers, of which no method of disposal is known heretofore other than discarding as a waste material. Namely, scraps of cured silicone rubbers can be compounded in a considerably large amount with a vulcanizable composition based on an organic rubbery elastomer such as fluorocarbon rubbers, e.g., binary copolymers of hexafluoropropylene and vinylidene fluoride, and dispersed therein in such fineness that particles of the cured silicone rubber can no longer be recognized by the naked eyes only when the organic rubbery elastomer composition has a specific Mooney viscosity (ML.sub.1+4 100.degree. C.) of at least 70 to give a uniform curable rubber composition capable of being cured into vulcanized rubber articles having various properties as good as or comparable with those of the vulcanized rubber articles from the same organic rubbery elastomer without admixture of cured silicone rubber scraps.
摘要:
A silicone putty composition having high impact resilience immediately after preparation and providing a soft silicone putty having low plasticity is obtained by blending (1) a diorganosiloxane of the formula:R.sub.n SiO.sub.(4-n)/2wherein R is a substituted or unsubstituted monovalent hydrocarbon group and n is a number of from 1.98 to 2.02, (2) an organopolysiloxane having a terminal alkoxy group, (3) boric acid or boron oxide, and (4) liquid paraffin. The composition is suited for use in toys and dampers.
摘要:
A silicone rubber laminate including a conductive layer of cured silicone rubber containing carbon black and a dielectric layer of cured silicone rubber stacked and integrated to each other. The bonding force is enhanced by applying to the conductive layer a dielectric uncured silicone rubber composition comprising (a) an organopolysiloxane containing at least two alkenyl groups per molecule, (b) an organopolysiloxane containing at least two SiH groups per molecule, (c) reinforcing silica, (d) an organic silicon compound having an alkenyl group per molecule, and (e) a platinum catalyst, the molar ratio of the SiH group in component (b) to the total alkenyl group in components (a) and (d) ranging from 1:1 to 4:1, and curing the composition.
摘要:
Silicone rubber is adhered to a metal surface by coating the metal surface with an organopolysiloxane adhesion improving agent of the formula: ##STR1## wherein R.sup.1 is a monovalent organic radical of from 2 to 8 carbon atoms which contains an unsaturated bond, R.sup.2 is a substituted or unsubstituted monovalent hydrocarbon radical of from 1 to 10 carbon atoms which contains no unsaturated bond, a is a number in the range of 1
摘要:
Acryl rubber foaming compositions comprising (A) an acrylic polymer prepared by copolymerizing an acrylate or methacrylate with a monomer having at least two aliphatic unsaturated bonds per molecule, (B) a pyrolytic organic foaming agent, and (C) an organic peroxide can be molded, cured and foamed into acryl rubber foams having improved heat insulation, heat resistance, weatherability, crack resistance, and oil resistance without a need for sulfur vulcanizer.
摘要:
A silicone rubber composition comprising an organopolysiloxane and a curing catalyst for the organopolysiloxane. The releasing property of the composition is significantly improved by the addition of N,N'-alkylene bisamide having not less than 10 carbon atoms. The composition is particularly effective for molding in a mold or covering a wire core.
摘要:
A copper smelting method includes: supplying an oxygen-enriched gas, a solvent, and a copper concentrate into a furnace, while not supplying a coke material; and supplying pig iron to slag that is generated in the furnace.
摘要:
Disclosed is a color composition for a color filter, which includes at least acrylic resin and a coloring agent. The acrylic resin contains a copolymer formed of a first vinyl monomer having a benzyl group and a second vinyl monomer having a carboxyl group, the copolymer having a weight average molecular weight of 3,000 to 11,000, and an acid value of solid matter of the copolymer being confined to 30 to 85.
摘要:
The present invention provides a method and facility for preventing crumbling and powderization of green pellets when producing high strength green pellets using a powder feedstock and using the pellets in a rotary hearth reducing furnace and for efficiently reducing the same. It comprises kneading by a kneader 5 a feedstock of a powder of a fine particle size (20 to 80 wt % having size of not more than 10 μm) including a metal oxide and carbon-bearing powder fed from a feed storage tank 1 and producing green pellets by a pan type pelletizer 7. The green pellets are screened by a pellet screen 9, then dried by a pellet dryer 11 and reduced by firing in a rotary hearth reducing furnace 13. At that time, the green pellets are continuously conveyed to prevent crumbling.