Refrigerating machine oil composition and working fluid composition for refrigerating machine using same

• US 10,640,691 B2
• Filed: 09/29/2016
• Issued: 05/05/2020
• Est. Priority Date: 09/29/2015
• Status: Active Grant

• Current Assignee: KH Neochem Co., Ltd.
• Original Assignee: KH Neochem Co., Ltd.
• Inventors: Sawada, Takahiro, Kishi, Junya, Okita, Aya
• Primary Examiner(s): McGinty, Douglas J
• Application Number:
  US15/764,715
• Publication Number:
  US 20180305599A1
• Time in Patent Office: 1,314 Days
• Field of Search: 252 68, 508459, 508485
• CPC Class Codes: C09K 2205/24 Only one single fluoro component present
• CPC Class Codes: C09K 5/045 containing only fluorine as halogen
• CPC Class Codes: C10M 105/38 of polyhydroxy compounds
• CPC Class Codes: C10M 107/28 containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate
• CPC Class Codes: C10M 107/32 Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
• CPC Class Codes: C10M 111/04 at least one of them being a macromolecular organic compound
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 171/008 Lubricant compositions compatible with refrigerants
• CPC Class Codes: C10M 2205/0206 used as base material
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/042 Epoxides
• CPC Class Codes: C10M 2207/282 of (cyclo)aliphatic oolycarboxylic acids
• CPC Class Codes: C10M 2207/2835 used as base material
• CPC Class Codes: C10M 2209/043 used as base material
• CPC Class Codes: C10M 2209/0845 used as base material
• CPC Class Codes: C10M 2217/0245 used as base material
• CPC Class Codes: C10M 2223/041 Triaryl phosphates
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2020/04 Molecular weight; Molecular weight distribution
• CPC Class Codes: C10N 2020/101 Containing Hydrofluorocarbons
• CPC Class Codes: C10N 2030/06 : Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/10 : Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2040/30 : Refrigerators lubricants or compressors lubricants
• CPC Class Codes: F25B 2500/16 : Lubrication

Abstract

Provided is a refrigerating machine oil composition for a refrigerant consisting of difluoromethane, the composition comprising a polymer (A) below and an ester (B) of polyhydric alcohol(s) with aliphatic monocarboxylic acid(s).

The polymer (A): a polymer which is obtained by polymerizing monomer(s) consisting of at least one monomer of monosubstituted ethylenes and disubstituted ethylenes, and in which a ratio of a monomer represented by the following general formula (I):

wherein R¹ represents an alkyl group having 1 to 5 carbon atoms, R² represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and the sum of carbon numbers in R¹ and R² is 2 to 5, is 75 to 100% by mass based on a total mass of monomers constituting the polymer.

Claims

1. A refrigerating machine oil composition for a refrigerant consisting of difluoromethane, the composition comprising:

a polymer (A) below, and

an ester (B) of polyhydric alcohol(s) with aliphatic monocarboxylic acid(s), wherein

the polymer (A) is a polymer which is obtained by polymerizing monomer(s) consisting of at least one monomer of monosubstituted ethylenes and disubstituted ethylenes, and in which a ratio of a monomer represented by the following general formula (I);

2. The refrigerating machine oil composition according to claim 1, wherein a mass ratio between the polymer (A) and the ester (B) is 3/97 to 45/55 (the polymer (A)/the ester (B)).

3. The refrigerating machine oil composition according to claim 1, wherein R¹ is an alkyl group having 1 to 4 carbon atoms, R2 is hydrogen or a methyl group, and the sum of carbon numbers in R¹ and R² is 2 to 5.

4. The refrigerating machine oil composition according to claim 1, wherein, in the polymer (A), the ratio of a monomer represented by the general formula (I) is 100% by mass based on the total mass of monomers constituting the polymer.

5. The refrigerating machine oil composition according to claim 1, wherein the ester (B) is an ester of at least one of pentaerythritol and dipentaerythritol with aliphatic monocarboxylic acid(s) having 4 to 9 carbon atoms.

6. The refrigerating machine oil composition according to claim 1, wherein a weight average molecular weight of the polymer (A) is 500 to 11000.

7. A working fluid composition for a refrigerating machine, comprising the refrigerating machine oil composition according to claim 1 and difluoromethane.