Abstract:
The present invention provides a highly thermal conductive compound which has a high thermal conductivity, has a high consistency and a good coating workableness, and is excellent in thermal stability at a high temperature.A highly thermal conductive compound containing (A) 85 to 97% by mass of an inorganic powder filler, (B) 2 to 15% by mass of a base oil, and (C) 0.001 to 10% by mass of a compound represented by Y—(—R2—COO—)n—R1—X (wherein R1 and R2 each is a bivalent hydrocarbon group having a linear or branched chain having 1 to 36 carbon atoms, n is 1 to 15, X and Y each is at least one substituent selected from the group consisting of a carboxyl group and a hydroxyl group or a hydrogen atom, and at least one of X and Y is a carboxyl group or a hydroxyl group; in the case where n is 2 to 15, the moiety of (—R2—COO—)n in the formula (1) may be a copolymer group composed of two or more constitutional units (—R2—COO—) wherein R2 is a bivalent hydrocarbon group different from one another).
Abstract:
A heat dissipating silicone grease composition comprising: (A) 3% to 30% by weight of an organo polysiloxane represented by the general formula, R1aSiO(4−a)/2(R1 is one or two or more groups selected from a group of saturated or unsaturated monovalent hydrocarbon groups containing one to eighteen carbon atoms, and a is a positive number defined by 1.8≦a≦2.2) having a dynamic viscosity at 25° C. of 50 mm2/s to 500,000 mm2/s; (B) 60% to 96.9% by weight of a thermally conductive filler having a thermal conductivity of at least 10 W/(m·K); and (C) 0.1% to 10% by weight of a solvent that disperses or dissolves component (A).
Abstract:
Grease precursors of overbased alkaline earth metal carboxylates are prepared by reacting an alkaline earth metal base and a carboxylic acid in the presence of a hydrocarbon liquid, a polyol and an alcohol. The resulting grease precursor has amorphous calcium carbonate and a calcite content of greater than 10% by weight. At least one converting agent is added to the grease precursor containing elevated levels of calcite. This mixture is heated followed by the removal of water to form calcite-containing greases having a calcite content greater than 12.5% by weight.
Abstract:
A thermal conductive grease used for diffusion of heat generated in electronic appliances is provided. The thermal conductive grease comprises: (A) a base oil having a viscosity of 112 to 770 mm2 at 40° C. and comprising a copolymer of an unsaturated dicarboxylic acid dibutyl ester and an α-olefin; and (B) a thermal conductive filler filled in the base oil. The thermal conductive grease does not include conventionally used silicone oil so that insulating substances will not be formed in the thermal conductive grease.
Abstract:
A lubricant composition comprising a lubricating base oil, fine particles and a calcium sulfonate-based thickener, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus comprising the speed reduction gear are disclosed. It is possible to reduce the operating noise of a speed reduction gear regardless of the amount of backlash that occurs on combining a small gear and a large gear without a more complicate structure of the speed reduction gear by an action of the fine particles while preventing separation of oil by an action of the calcium sulfonate-based thickener added to the lubricant composition, and thus the noise in the inside of car generated by the electric power steering apparatus can be reduced with a low cost.
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 mm2/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 grease composition containing: (a) the reaction product of: (i) a calcium containing overbased organic acid; and (ii) at least one acid producing compound or derivatives thereof selected from the group consisting of: (1) a non-polymeric hydrocarbyl substituted dicarbonyl derivative selected from the group consisting of an acid, an ester, a salt, an anhydride, ester-acid, acid-salt and mixtures thereof; (2) a copolymer derived from monomers containing (1) an olefin; and (2) an unsaturated dicarboxylic acid anhydride or derivatives thereof; and (3) an inorganic acid containing about 2 or more acidic hydrogens; and (b) an oil of lubricating viscosity, wherein the overbased calcium sulphonate contains colloidally dispersed calcium carbonate is selected from the group consisting of calcite, vaterite and mixtures thereof. The invention further relates to the process to make the composition and its use in greases to increase water resistance.
Abstract:
A heat dissipating silicone grease composition comprising: (A) 3% to 30% by weight of an organo polysiloxane represented by the general formula, R1aSiO(4−a)/2(R1 is one or two or more groups selected from a group of saturated or unsaturated monovalent hydrocarbon groups containing one to eighteen carbon atoms, and a is a positive number defined by 1.8≦a≦2.2) having a dynamic viscosity at 25° C. of 50 mm2/s to 500,000 mm2/s; (B) 60% to 96.9% by weight of a thermally conductive filler having a thermal conductivity of at least 10 W/(m·K); and (C) 0.1% to 10% by weight of a solvent that disperses or dissolves component (A).
Abstract:
The present invention provides a rolling apparatus comprising a movable member which can undergo rotary or linear motion, a support member which carries the movable member, rolling elements which are interposed between the movable member and the support member and which roll with the movement of the movable member, and a lubricant composition which is disposed between the movable member on which the rolling elements roll and the support member, wherein the lubricant composition is a mixture of (1) a thickening agent which is at least one selected from the group consisting of a solid fluoropolymer, a lamellar mineral powder, an ultrafinely particulate organic material, an organic solid lubricant and an ultrafinely particulate inorganic material, and (2) a base oil comprising a liquid fluorinated polymer oil.
Abstract:
There are provided a highly thermal conductive grease composition having both a thermal conductivity and a satisfactory dispense property, and a cooling device applied with same. The grease composition comprises from 70 to 90% by volume of an inorganic powder which is a mixture containing at least two kinds of inorganic powders different from each other in each average particle size, and from 10 to 30% by volume of a base oil containing a mineral oil or a synthetic oil, the base oil further containing a surfactant in an amount of from 0.2 to 2.0% by weight based on the weight of the inorganic powder.