摘要:
A silicone elastomer having improved fatigue resistance is obtained by heat-curing a composition consists essentially of an organopolysiloxane gum having vinyl endblocking, an organopolysiloxane gum having from 0.1 to 2.0 percent of the organic radicals present as alkenyl radicals, an organopolysiloxane fluid having from 10 to 75 percent of the radicals present as alkenyl radicals, an organohydrogenpolysiloxane having at least 2 silicon-bonded hydrogen radicals in each molecule, a specific silica filler, and an organoperoxide.
摘要:
Molded silicone rubber unitary bodies of a carbon black containing portion and a portion containing substantially no carbon black which is obtained from a platinum catalyzed addition reaction composition are useful as keyboard pads, zebra-type connectors, and electrical joints. These molded bodies can be made by tightly contacting the uncured composition containing substantially no carbon black with a cured silicone rubber containing the carbon black and then heating to cure.
摘要:
A moldable silicone rubber sponge composition comprising (A) 100 weight parts silicone rubber base compound with a Williams plasticity at 25° C. of 50 to 600 comprising (a) 100 weight parts diorganopolysiloxane gum that contains at least 2 alkenyl groups in each molecule and (b) 1 to 120 weight parts wet-process silica, (B) 0.01 to 50 weight parts hollow gas-containing thermoplastic resin powder, and (C) curing agent in an amount sufficient to effect curing of the composition. The invention is further a silicone rubber sponge afforded by the thermosetting of the above-defined moldable silicone rubber sponge composition and a method for producing the silicone rubber sponge.
摘要:
A self-extinguishing silicone elastomer containing a curable organopolysiloxane, silica filler, platinum, carbon black, TiO.sub.2 and a triazole compound is disclosed.
摘要:
Cured electrically conductive silicone rubber products exhibiting bleed-out of a silicone oil at a controlled rate are prepared from compositions containing carbon black and a curable polyorganosiloxane wherein 90 mol % of the silicon-bonded hydrocarbon groups are methyl. The silicone oil is a liquid polyorganosiloxane containing at least 1 mol %, based on the total number of hydrocarbon radicals present in said silicone oil, of silicon-bonded halogenated hydrocarbon radicals and the silicone oil is incompatible with the cured silicone rubber product.
摘要:
A silicone rubber emulsion composition comprising (A) 100 parts diorganopolysiloxane having at least two silicon-bonded alkenyl groups, (E) 0 to 60 parts reinforcing silica filler, (B) 10 to 250 parts water containing a smectite clay, (C) 0.1 to 15 parts emulsifier, and (D) a cross-linking agent (e.g., an organohydrogenpolysiloxane) in an amount sufficient for cross-linking component (A) and a catalyst (e.g., a platinum-type catalyst). A method for preparing the aforementioned emulsion composition comprising mixing components (A) and (E) with other components in a high-speed stirrer-equipped mixer. A method of manufacturing a silicone rubber comprising either heating and dehydrating the aforementioned emulsion composition.
摘要:
A silicone rubber emulsion composition comprising (A) 100 parts diorganopolysiloxane having at least two silicon-bonded alkenyl groups, (E) 0 to 60 parts reinforcing silica filler, (B) 10 to 250 parts water containing a smectite clay, (C) 0.1 to 15 parts emulsifier, and (D) a cross-linking agent (e.g., an organohydrogenpolysiloxane) in an amount sufficient for cross-linking component (A) and a catalyst (e.g., a platinum-type catalyst). A method for preparing the aforementioned emulsion composition comprising mixing components (A) and (E) with other components in a high-speed stirrer-equipped mixer. A method of manufacturing a silicone rubber comprising either heating and dehydrating the aforementioned emulsion composition.
摘要:
The present invention provides carbon fiber paper consisting of an organic high-molecular compound as a binder and carbon fibers, characterized in that the carbon fibers contain thin fibers with an average diameter smaller than 5 μm and an average fiber length of 3 to 10 mm; a porous carbon electrode substrate for a fuel cell having a thickness of 0.05 to 0.5 mm and a bulk density of 0.3 to 0.8 g/cm3, also having a bending strength of 10 MPa or higher and a deflection of 1.5 mm or more at the time of bending, measured by a three-point bending test in conditions of using a sample width of 1 cm, a strain rate of 10 mm/min, and a distance between supporting points of 2 cm; and a method of producing a porous carbon electrode substrate for a fuel cell by impregnating the carbon fiber paper with a thermosetting resin, curing the thermosetting resin by heating and pressing treatment, and then carbonizing the paper. The electrode substrate of the present invention is excellent in flexibility and bending strength and able to be rolled on a roll and thus has high productivity, and the carbon fiber paper of the present invention is suitable for producing the electrode substrate.
摘要翻译:本发明提供由作为粘合剂的有机高分子化合物和碳纤维组成的碳纤维纸,其特征在于,所述碳纤维含有平均直径小于5μm,平均纤维长度为3〜10mm的细纤维; 具有厚度为0.05〜0.5mm,体积密度为0.3〜0.8g / cm 3的燃料电池用多孔碳电极基板,其弯曲强度为10MPa以上,偏转 在使用1cm的样品宽度,10mm / min的应变速度和2cm的支撑点之间的距离的条件下,通过三点弯曲试验测定弯曲时的1.5mm以上的1.5mm以上。 以及通过用热固性树脂浸渍碳纤维纸来制造用于燃料电池的多孔碳电极基板的方法,通过加热和压制处理固化热固性树脂,然后碳化碳纸。 本发明的电极基板的柔软性和弯曲强度优异,能够在辊上滚动,因此具有高生产率,本发明的碳纤维纸适用于制造电极基板。
摘要:
Method and apparatus for cutting high viscosity liquid material, said apparatus comprising a cylinder divided into upper and lower tanks by a partition with a central discharge opening, a moveable and elevatable liquid supply pipe with a distal end positioned opposite the discharge opening, the liquid supply pipe being mounted so that it can be raised until its distal end contacts the partition around the discharge opening, and then lowered until there is no contact, means for raising and lowering the liquid supply pipe, the upper tank having peripheral injection ports for injecting a low viscosity liquid into the upper tank, means for feeding high viscosity liquid material into the lower tank and flowing it into the upper tank, means for feeding low viscosity liquid into the liquid supply pipe and for feeding low viscosity liquid into the peripheral injection ports, the high viscosity liquid material flowing from the lower tank into the upper tank when the liquid supply pipe is lowered, the high viscosity liquid material being pushed upwardly into the upper tank by the low viscosity liquid when the liquid supply pipe is raised, whereby the high viscosity liquid material being pushed upwardly in the upper tank is cut into blocks by the low viscosity liquid being injected into the upper tank.
摘要:
A silicone rubber particulate composition useful as an additive for cosmetics, rubbers, resins and paints is disclosed, said composition comprising:(A) a silicone rubber particulate having an average particle size of 0.1 to 1,000 .mu.m;(B) a water-absorptive resin particulate having a water-free average particle size of 0.1 to 1,000 .mu.m; and(C) water,wherein said component (B) is present at a level of 0.01 to 5 weight percent measured on a water-free basis relative to component (A) and said water is present at a level of 10 to 10,000 weight parts for each 100 weight parts of component (B).