Abstract:
Fluorinated lubricants of formula T-O-[A-B]z-[A-B']z'-A-T' (I) wherein: A = -(X)a-O-A'-(X')b- A' is a perfluoropolyether chain comprising units (CF2O), (CF2CF2O), (CF2CF2CF2O), (CF2CF2CF2CF2O); X, X' = -CF2-, -CF2CF2-; a, b = 0 or 1; B derives from olefins, of which at least one homopolymerizable by radical route, of formula: -[(CR1R2-CR3R4)j(CR5R6-CR7R8)j']- (Ia) wherein j = 1-5, j'= 0-4 and 2
Abstract:
Use as additive to stabilize perfluoropolyether lubricant oils at high temperatures, preferably higher than 200°C, of a solid polymer at room temperature, having a softening or a melting point higher than 150°C, preferably higher than 200°C, and containing in the repeating unit at least one aromatic ring, preferably in the backbone, and lubricating compositions containing said additive.
Abstract:
Provided is a heat conductive silicone grease composition, including: (A) 100 parts by volume of an organopolysiloxane with a specific structure and with a kinematic viscosity at 25°C of 10 to 10,000 mm 2 /s, (B) 0.1 to 50 parts by volume of an alkoxysilane with a specific structure, and (C) 100 to 2,500 parts by volume of a heat conductive filler. The composition exhibits high thermal conductivity, retains excellent fluidity meaning the composition exhibits favorable workability, and is capable of filling fine indentations, thereby reducing contact resistance and providing excellent heat radiation performance. Also, the durability, under conditions of high temperature and high humidity, of the composition is improved, thereby improving the reliability of the composition during actual use. Heat generated by a heat-generating body can be dissipated into a heat-radiating body by sandwiching the composition between the heat-generating body and the heat-radiating body.
Abstract:
Provided is a heat conductive silicone grease composition, including: (A) 100 parts by volume of an organopolysiloxane with a specific structure and with a kinematic viscosity at 25°C of 10 to 10,000 mm 2 /s, (B) 0.1 to 50 parts by volume of an alkoxysilane with a specific structure, and (C) 100 to 2,500 parts by volume of a heat conductive filler. The composition exhibits high thermal conductivity, retains excellent fluidity meaning the composition exhibits favorable workability, and is capable of filling fine indentations, thereby reducing contact resistance and providing excellent heat radiation performance. Also, the durability, under conditions of high temperature and high humidity, of the composition is improved, thereby improving the reliability of the composition during actual use. Heat generated by a heat-generating body can be dissipated into a heat-radiating body by sandwiching the composition between the heat-generating body and the heat-radiating body.
Abstract:
A perfluoropolyether, a composition comprising the perfluoropolyether, a process for producing the perfluoropolyether, and a process for improving the thermostability of grease or lubricant are provided. The perfluoropolyether comprises (1) perfluoroalkyl radical end groups in which the radical has at least 3 carbon atoms per radical and is substantially free of perfluoromethyl and perfluoroethyl end groups or (2) at least one bromine or iodine atom at the primary position of the perfluoropolyether.
Abstract:
A grease-like silicone composition comprising at least (A) a liquid organopolysiloxane comprising 80 to 96.5 mol% of siloxane units represented by the formula R 2 SiO 2/2 , 1.0 to 10.0 mol% of siloxane units represented by the formula RSiO 3/2 , and 0.25 to 10.0 mol% of siloxane units represented by the formula R 3 SiO 1/2 (in the formulas, R stands for identical or different monovalent hydrocarbon groups) and (B) a thickening agent is disclosed. A grease-like silicone composition can be provided that is capable of containing a large amount of thickening agents and possesses superior heat resistance.
Abstract:
An aluminum nitride powder having the surface treated with an organosilane represented by formula, R I a R II b SiY 4-1-b , and/or a partial hydrolysis condensate thereof to acquire excellent moisture-proof, wherein R I represents a 6-20C alkyl group or a group formed by substituting halogen atom or atoms for part or all of the hydrogen atoms attached to carbon atoms of the 6-20C alkyl group, R II represents a 1-20C hydrocarbon group or a group formed by substituting halogen atom or atoms for part or all of the hydrogen atoms attached to carbon atoms of the 1-20C hydrocarbon group, Y represents a hydrolyzable group, a is an integer of 1 to 3 and b is an integer of 0 to 2, provided that a+b is an integer of 1 to 3; and a thermally conductive grease composition comprising (A) 50-95 weight % of the aforementioned surface-treated aluminum nitride powder and (B) 5 to 50 weight % of at least one base oil selected from the group consisting of liquid silicones, liquid hydrocarbons and fluorohydrocarbon oils, and further, if desired, (C) 0-30 weight % of a thicknener selected from the group consisting of zinc oxide, alumina, boron nitride and silicon carbide powders.
Abstract translation:具有由式R a a B b Si Y 4 -1-b表示的有机硅烷表面处理的氮化铝粉末和/或其部分水解缩合物以获得优异的防湿性,其中R 1表示 6-20C烷基或通过用卤原子或原子取代与6-20C烷基的碳原子连接的部分或全部氢原子形成的基团,R II代表1-20C烃基或基团 通过用1-20个碳原子的碳原子连接的部分或全部氢原子代替卤原子或原子而形成,Y表示可水解基团,a为1〜3的整数,b为0〜2的整数 条件是a + b为1〜3的整数。 和导热性油脂组合物,其包含(A)50-95重量%的上述表面处理的氮化铝粉末和(B)5至50重量%的至少一种基础油,其选自液体硅酮,液体烃 和氟代烃油,并且如果需要,(C)0-30重量%的选自氧化锌,氧化铝,氮化硼和碳化硅粉末的增稠剂。
Abstract:
A lubricant having good extreme pressure properties and wear resistance contains not less thatn 0.1% by weight of at least one metallic phosphorus chalcogenide or an intercalation compound thereof.
Abstract:
High dropping-point lithium-complex grease composition having improved anti-noise properties, comprising a lubricating oil and the following components: (a) at least one lithium soap selected from the group consisting of the lithium salts of C10 to C34 fatty acids and C12 to C24 hydroxy fatty acids, (b) at least one lithium salt selected from the group consisting of the dilithium salts of C4 to C12 aliphatic dicarboxylic acids, the lithium salts of boric acids, and the lithium salts of aromatic hydroxy carboxylic acids, and (c) a high-molecular viscosity-index improver, and/or succinimide-type dispersant and/or metal salt detergent.