Idemitsu Kosan Company, Limited

Takeo Tokiai

Masato Kaneko

Hiroaki Koshima

A lubricating oil composition for a refrigerating machine according to the present invention includes: a base oil including as a main component at least one kind of oxygen-containing compound selected from polyoxyalkylene glycols, polyvinyl ethers, copolymers of poly(oxy)alkylene glycols or monoethers thereof and polyvinyl ethers, polyol esters, and polycarbonates; a sulfonic acid metal salt having a hydrocarbyl group; and a phosphoric acid ester. The lubricating oil composition for a refrigerating machine can enhance the abrasion resistance of a sliding part of a refrigerating machine using a refrigerant including at least one kind of fluorine-containing organic compound selected from compounds represented by the following molecular formula (A) or including a combination of the fluorine-containing organic compound and a saturated fluorinated hydrocarbon compound: COFR(A) [in the formula: R represents Cl, Br, I, or H; and p represents an integer of from 1 to 6, q represents an integer of from 0 to 2, r represents an integer of from 1 to 14, and s represents an integer of from 0 to 13, provided that, when q represents 0, p represents from 2 to 6 and one or more carbon-carbon unsaturated bonds are included in a molecule].

Lubricating-oil composition for refrigeration device

A refrigerator oil composition contains base oil and polyalkylene glycol (PAG) block copolymer. The PAG block polymer is represented by the following formula (1).R[(OR)(OE)OR]&#x2003;&#x2003;(1)In the formula: Rrepresents a hydrocarbon residue having 1 to 10 carbon atoms; Rrepresents an alkenyl group having 3 to 6 carbon atoms; E represents an ethylene group; Rrepresents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; m and n each represent a positive integer, a ratio of m to n (m/n) being 99/1 to 50/50; and l represents an integer in a range of 1 to 100.

Refrigerator oil composition

The present invention provides a refrigerating oil composition containing a refrigerant (A) containing as a predominant component a C1-C8 hydrocarbon compound and a base oil (B) composed of a polyalkylene glycol ether having a specific structure and/or a polyvinyl ether having a specific structure, and satisfying the following conditions: solubility of the refrigerant (A) in the base oil (B) of 40 mass % or less at 40&#xb0; C. and 1.2 MPa and mixture viscosity of the refrigerating oil composition of 0.1 mm/s or more at 90&#xb0; C. and 2.3 MPa. According to the refrigerating oil composition of the present invention, refrigerating oil and hydrocarbon-based refrigerant are mutually dissolved at an appropriate degree, and lubrication can be fully attained by the refrigerating oil. Even when the hydrocarbon-based refrigerant is used in an amount smaller than the conventional amount, cooling can be performed satisfactorily.

Refrigerating machine oil composition

A refrigerator oil composition includes: a synthetic base oil; and a partial hydrocarbyl ether of an aliphatic polyhydric alcohol condensate, in which the aliphatic polyhydric alcohol condensate includes a condensate of 4 to 20 molecules of a hindered glycol and/or an aliphatic polyhydric alcohol having 3 to 6 hydroxyl groups. The refrigerator oil composition is preferably used in a compression refrigerator that uses a hydrofluorocarbon, a natural refrigerant such as a hydrocarbon, carbon dioxide, or ammonia, a mixed refrigerant of fluoroiodomethane and propene, an unsaturated fluorinated hydrocarbon, a fluorinated ether, a fluorinated alcohol, a fluorinated ketone, or a mixture thereof as a refrigerant, has a low coefficient of friction, and is excellent in energy-saving property.

Growing community of inventors

Chiba, Japan

Takeo Tokiai