摘要:
A conductive silicone rubber composition is provided, which includes (a) 100 parts by weight of an organopolysiloxane represented by an average composition formula of RaSiO(4−a)/2 wherein R is an unsubstituted or substituted monovalent hydrocarbon group which may be the same or different, and a is a positive number of 1.90 to 2.05, (b) 50 to 500 parts by weight of conductive particles comprising carbon coated with Ni, and (c) 0.1 to 10 parts by weight of an organic peroxide. This composition has an adequate pot life, is unlikely to be affected by catalyst poisoning, and is suitable for normal pressure hot air vulcanization. Cured products produced from the composition has a low volume resistivity and excellent electromagnetic interference sealing properties.
摘要:
A silicone rubber is prepared from a silicone rubber compound comprising (A) an organopolysiloxane having an average degree of polymerization of at least 100, (B) a reinforcing silica filler, and (C) an organohydrogenpolysiloxane by mixing component (C) with components (A) and (B) and heating them at a temperature of at least 100.degree. C. to form the silicone rubber compound, adding an organic peroxide or a platinum group metal catalyst to the compound, and crosslinking the compound. The silicone rubber exhibits a minimal difference in physical properties between primary vulcanization and secondary vulcanization.
摘要:
A silicone rubber composition comprising an organopolysiloxane component composed of (A) an organopolysiloxane gum having an alkenyl content of 0.001-2 mol % and (B) an organopolysiloxane gum having an alkenyl content of more than 2 mol % to 20 mol %, (C) microparticulate silica, (D) platinum or a platinum compound, (E) an organosilicon compound containing a nitrogenous organic group and an unsaturated hydrocarbon group and/or a benzotriazole, and (F) a curing agent cures into electrically insulating silicone rubber having a minimized tensile permanent set, improved mechanical strength, and tracking resistance.
摘要:
A silicone rubber coating composition comprising (A) a diorganopolysiloxane containing an average of at least two alkenyl groups, (B) silica powder having a specific surface area of at least 50 m2/g, (C) an organosilicon compound containing a ureido group, an isocyanuric acid ester modified with an organosilicon compound or a (partial) hydrolytic condensate thereof, and (D) a curing agent is applied and vulcanized to base fabric to form a coated fabric, from which airbags are prepared. The composition has a sufficient adhesion to withstand high temperature and abrupt elongation upon inflation of the airbag even after long-term storage under hot humid conditions.
摘要:
A silicone rubber coating composition which cures into a silicone rubber having a tear strength of 25-50 kN/m and a peeling bond strength of 30-60 N/cm is suited for coating of hollow weave type air bags. A hollow weave type air bag coated with the coating composition can be instantaneously inflated while the bag prevents the silicone rubber film from being peeled from the base fabric, eliminates inflating gas leakage, and retains an acceptable inflation time.
摘要:
A silicone rubber coating composition which cures into a silicone rubber having a tear strength of 25-50 kN/m and a peeling bond strength of 30-60 N/cm is suited for coating of hollow weave type air bags. A hollow weave type air bag coated with the coating composition can be instantaneously inflated while the bag prevents the silicone rubber film from being peeled from the base fabric, eliminates inflating gas leakage, and retains an acceptable inflation time.
摘要:
A silicone rubber composition comprising (A) an organopolysiloxane, (B) an inorganic filler, typically fumed silica, and (C) a specific halogen-free organic peroxide, typically 1,6-bis(p-toluoylperoxycarbonyloxy)hexane or 1,6-bis(benzoylperoxycarbonyloxy)hexane is safe and lends itself to atmospheric hot air vulcanization so that it can be extrusion vulcanized into silicone rubber having satisfactory physical properties without voids or surface tack. The silicone rubber composition is extrusion molded around an electrical wire, constructing a covered wire.
摘要:
A silicone rubber coating composition comprising (A) a diorganopolysiloxane containing an average of at least two alkenyl groups, (B) silica powder having a specific surface area of at least 50 m2/g, (C) an organosilicon compound containing a ureido group, an isocyanuric acid ester modified with an organosilicon compound or a (partial) hydrolytic condensate thereof, and (D) a curing agent is applied and vulcanized to base fabric to form a coated fabric, from which airbags are prepared. The composition has a sufficient adhesion to withstand high temperature and abrupt elongation upon inflation of the airbag even after long-term storage under hot humid conditions.
摘要:
A foamable silicone rubber composition is provided that includes: (A) a diorganopolysiloxane; (B-1) an organohydrogenpolysiloxane represented by the general formula (2): ##STR1## (B-2) an organohydogenpolysiloxane represented by the general formula (3): ##STR2## (C) a hydroxyl-group source; and (D) a platinum group metal compounds; the component (B-1) and the component (B-2) being in a weight ratio of from 20/80 to 90/10.
摘要:
The curable and foamable organopolysiloxane composition comprises three different organopolysiloxanes, of which (A) the first is an .alpha.,.omega.-divinyl dimethyl polysiloxane, (B) the second is an organopolysiloxane having, in a molecule, at least three silicon-bonded hydroxy groups and (C) the third is an organohydrogenpolysiloxane having, in a molecule, at least two silicon-bonded hydrogen atoms, along with a platinum catalyst. The platinum-catalyzed curing and foaming reactions proceed in two ways of, one, the hydrosilation between the vinyl groups in (A) and the silicon-bonded hydrogen atoms in (C) and, the other, by the dehydrogenation between the silanol groups in (B) and the silicon-bonded hydrogen atoms in (C). The composition gives a cured and foamed silicone rubber body having excellent mechanical properties with a good cell structure by standing at room temperature or by heating up to 70.degree. C.