Composition for heat cycle system, and heat cycle system

• US 9,957,429 B2
• Filed: 07/25/2016
• Issued: 05/01/2018
• Est. Priority Date: 02/20/2014
• Status: Active Grant

• Current Assignee: AGC, Inc.
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Fukushima, Masato, Mitsuoka, Hiroaki, Tasaka, Mai, Shirakawa, Daisuke, Takagi, Hirokazu, Arai, Takeaki
• Primary Examiner(s): MC GINTY, DOUGLAS J
• Application Number:
  US15/218,521
• Publication Number:
  US 20160333241A1
• Time in Patent Office: 645 Days
• Field of Search: 252 67, 252 68, 252 69, 62529
• CPC Class Codes: C09K 2205/126 Unsaturated fluorinated hydrocarbons
• CPC Class Codes: C09K 5/045 containing only fluorine as halogen
• CPC Class Codes: C10M 105/04 aliphatic
• CPC Class Codes: C10M 105/38 of polyhydroxy compounds
• CPC Class Codes: C10M 107/24 containing monomers having an unsaturated radical bound to an alcohol, aldehyde, ketonic, ether, ketal or acetal radical
• CPC Class Codes: C10M 171/00 Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated chemically defined ingredients C10M101/00 - C10M169/00; petroleum fractions C10M101/02, C10M121/02, C10M159/04
• CPC Class Codes: C10M 171/008 Lubricant compositions compatible with refrigerants
• CPC Class Codes: C10M 171/02 Specified values of viscosity or viscosity index
• CPC Class Codes: C10M 2203/045 used as base material
• CPC Class Codes: C10M 2203/1065 used as base material
• CPC Class Codes: C10M 2207/2835 used as base material
• CPC Class Codes: C10M 2209/043 used as base material
• CPC Class Codes: C10N 2020/101 Containing Hydrofluorocarbons
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/04 Detergent property or dispersant property
• CPC Class Codes: C10N 2030/10 Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/28 Anti-static
• CPC Class Codes: C10N 2040/30 Refrigerators lubricants or compressors lubricants
• CPC Class Codes: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02

Abstract

A composition for a heat cycle system having favorable lubricating properties is provided. A heat cycle system employing the composition is also provided. The composition contains a working fluid for heat cycle, which has a low global warming potential and can replace R410A. The working fluid contains an unsaturated fluorinated hydrocarbon compound having a specific structure and a refrigerant oil having a breakdown voltage of at least 25 kV, a hydroxy value of at most 0.1 mgKOH/g, and a minimum temperature on the high temperature side of the phase separation temperature from the working fluid of at least 35° C. and a maximum temperature on the low temperature side of at most −60° C.

Claims

1. A composition, comprising

a working fluid for heat cycle containing difluoromethane as a saturated fluorinated hydrocarbon compound, trifluoroethylene and 2,3,3,3-tetrafluoropropene as unsaturated fluorinated hydrocarbon compounds, and optionally at least one other unsaturated fluorinated hydrocarbon compound which is a compound comprising at least one carbon-carbon unsaturated bond and represented by formula (I), and

a refrigerant oil having a breakdown voltage of at least 25 kV, a hydroxyl value of at most 0.1 mgKOH/g, and a minimum temperature on a high temperature side of a phase separation temperature from the working fluid for heat cycle of at least 35°

C. and a maximum temperature on a low temperature side of at most −

60°

C.;

C_xF_yR_z 

 

(I),

where R is H or Cl, x is an integer of from 2 to 6, y is an integer of from 1 to 12, and z is an integer of from 0 to 11, provided that 2x≥

y+z≥

2.

2. The composition according to claim 1, wherein the compound of the formula (I) where x is 2 or 3 is contained.

3. The composition according to claim 2, wherein the at least one other unsaturated fluorinated hydrocarbon compound selected from the group consisting of 1,2-difluoroethylene, 2-fluoropropene, 1,1,2-trifluoropropene, (E)-1,2,3,3,3-pentafluoropropene, (Z)-1,2,3,3,3-pentafluoropropene, (E)-1,3,3,3-tetrafluoropropene, (Z)-1,3,3,3-tetrafluoropropene and 3,3,3-trifluoropropene is contained.

4. The composition according to claim 1, wherein the working fluid for heat cycle further contains at least one other saturated fluorinated hydrocarbon compound.

5. The composition according to claim 4, wherein the at least one other saturated fluorinated hydrocarbon compound selected from the group consisting of trifluoromethane, difluoroethane, trifluoroethane, tetrafluoroethane, pentafluoroethane, trifluoroiodomethane, pentafluoropropane, hexafluoropropane, heptafluoropropane, pentafluorobutane and heptafluorocyclopentane is contained.

6. The composition according to claim 1, wherein a content of trifluoroethylene is from 20 to 80 mass % per 100 mass % of the working fluid.

7. The composition according to claim 1, wherein a content of difluoromethane is from 20 to 80 mass % per 100 mass % of the working fluid.

8. The composition according to claim 1, wherein

a proportion of a total amount of trifluoroethylene, 2,3,3,3-tetrafluoropropene and difluoromethane based on an entire amount of the working fluid is higher than 90 mass % and at most 100 mass %, and

based on the total amount of trifluoroethylene, 2,3,3,3-tetrafluoropropene and difluoromethane, a proportion of trifluoroethylene is at least 10 mass % and less than 70 mass %, a proportion of 2,3,3,3-tetrafluoropropene is higher than 0 mass % and at most 50 mass %, and a proportion of difluoromethane is higher than 30 mass % and at most 75 mass %.

9. The composition according to claim 1, wherein

a proportion of a total amount of trifluoroethylene, 2,3,3,3-tetrafluoropropene, and difluoromethane based on an entire amount of the working fluid for heat cycle is higher than 90 mass % and at most 100 mass %,

based on the total amount of trifluoroethylene, 2,3,3,3-tetrafluoropropene, and difluoromethane, a proportion of a total amount of trifluoroethylene and 2,3,3,3-tetrafluoropropene is at least 70 mass %, a proportion of trifluoroethylene is at least 30 mass % and at most 80 mass %, a proportion of 2,3,3,3-tetrafluoropropene is higher than 0 mass % and at most 40 mass %, and a proportion of difluoromethane is higher than 0 mass % and at most 30 mass %, and

a ratio of trifluoroethylene to 2,3,3,3-tetrafluoropropene is at most 95/5.

10. The composition according to claim 1, wherein the refrigerant oil comprises at least one of a polyol ester refrigerant oil and a polyvinyl ether refrigerant oil.

11. The composition according to claim 1, wherein the refrigerant oil has a kinematic viscosity at 40°

C. of from 5 to 200 mm²/s and a kinematic viscosity at 100°

C. of from 1 to 100 mm²/s.

12. The composition according to claim 1, wherein the refrigerant oil has an aniline point of at least −

100°

C. and at most 0°

C.

13. A heat cycle system, comprising the composition according to claim 1.

14. The heat cycle system according to claim 13, which is at least one of a refrigerating apparatus, an air-conditioning apparatus, a power generation system, a heat transport apparatus, and a secondary cooling machine.

15. The heat cycle system according to claim 14, which comprises a compression mechanism comprising a contact portion in contact with the composition,

wherein the contact portion comprises at least one of an engineering plastic, an organic film, and an inorganic film.