摘要:
A RTV heat conductive silicone rubber composition comprising (A) an organopolysiloxane having hydrolyzable groups at both ends, (B) an organopolysiloxane having at least one hydrolyzable group at one end, (C) a heat conductive filler, and (D) an organosilicon compound having a hydrolyzable group or a partial hydrolytic condensate thereof experiences a minimized viscosity increase even when loaded with a large amount of heat conductive filler (C), has good potting, coating and sealing properties, and is suited for use in one package form.
摘要:
A room temperature curable rubber composition of a condensation curing type that comprises as a base polymer a diorganopolysiloxane or a polyoxyalkylene in which both ends of the molecular chain are blocked with a hydrolyzable silyl group, and a .beta.-dicarbonyl compound and an amino group containing organic compound that are blended with the base polymer. Since the room temperature curable rubber composition is cured with water in the air and at the same time the dehydration condensation of the .beta.-carbonyl group and the amino group produces water in the composition, the quick curability and deep curability are improved remarkably. In addition, since this dehydration condensation reaction is an irreversible reaction, the product produced by the condensation dehydration is hydrolyzed to prevent the amino group containing compound from being regenerated, and as a result the hydrophilic nature of the cured product is prevented from increasing not to damage the water resistance.
摘要:
An organopolysiloxane composition comprising 0.01% to less than 0.5% by weight of a sulfidable metal powder is provided. When a silver-containing precision electronic part is encapsulated or sealed with the cured composition, the metal powder in the cured composition is sulfided with sulfur-containing gas for thereby preventing or retarding the corrosion of the electronic part with the sulfur-containing gas.
摘要:
An inorganic filler which has been surface coated with an addition cure silicone composition in the cured state is included in an organopolysiloxane composition, which becomes effective for preventing the filler from settling down even during long-term shelf storage.
摘要:
A room temperature curable organopolysiloxane composition comprising (a) an organopolysiloxane having a specific structure, (b) a alkenoxysilane or substituted alkenoxysilane or a partial hydrolyzate thereof, and (c) a siloxane or a partial hydrolyzate thereof cures into a product which experiences no decline of insulation resistance upon application of voltage in a hot humid environment and is resistant to electrolytic corrosion.
摘要:
Provided is a room temperature-curable, heat-conductive silicone rubber composition, including: (A) a diorganopolysiloxane with both molecular chain terminals blocked with hydroxyl groups and/or organooxy groups, (B) a heat-conductive filler other than a palladium powder, (C) an organosilane containing two or more hydrolyzable groups, and/or a partial hydrolysis-condensation product thereof, and (D) a palladium powder. The composition improves on the drawbacks of the conventional technology, is able to suppress the quantity of hydrogen gas produced from the heat-conductive filler, exhibits superior storage properties, and yields a low-hardness cured product upon curing. The cured product is useful as a heat-conductive material for a heat-generating electronic component.
摘要:
RTV silicone rubber compositions are provided comprising (A) an organopolysiloxane, (B) an organosilicon compound or partial hydrolytic condensate thereof, and (C) a non-aromatic amino-bearing compound. The compositions, when electric and electronic parts having a copper, silver or other metal portion on their surface are encapsulated or sealed therewith, can prevent or retard the parts from corrosion with sulfur-containing gas.
摘要:
Provided is a room temperature-curable, heat-conductive silicone rubber composition, including: (A) a diorganopolysiloxane with both molecular chain terminals blocked with hydroxyl groups and/or organooxy groups, (B) a heat-conductive filler other than a palladium powder, (C) an organosilane containing two or more hydrolyzable groups, and/or a partial hydrolysis-condensation product thereof, and (D) a palladium powder. The composition improves on the drawbacks of the conventional technology, is able to suppress the quantity of hydrogen gas produced from the heat-conductive filler, exhibits superior storage properties, and yields a low-hardness cured product upon curing. The cured product is useful as a heat-conductive material for a heat-generating electronic component.
摘要:
RTV silicone rubber compositions are provided comprising (A) an organopolysiloxane, (B) an organosilicon compound or partial hydrolytic condensate thereof, and (C) a non-aromatic amino-bearing compound. The compositions, when electric and electronic parts having a copper, silver or other metal portion on their surface are encapsulated or sealed therewith, can prevent or retard the parts from corrosion with sulfur-containing gas.
摘要:
An organopolysiloxane composition which contains from 0.01% to less than 0.5% by weight of a sulfidable metal powder is provided. When a silver-containing precision electronic part is encapsulated or sealed with the cured composition, the metal powder in the cured composition is sulfided with sulfur-containing gas, thereby preventing or retarding the corrosion of the encapsulated or sealed electronic part with the sulfur-containing gas.