Composition for refrigeration machine and composition kit for refrigeration machine
Provided is a composition for a refrigeration machine capable of reducing a friction coefficient in friction between sliding members in a refrigeration machine, and a composition kit for a refrigeration machine for providing the composition for a refrigeration machine. A composition for a refrigeration machine of the present disclosure includes a refrigeration machine oil, nanodiamond particles dispersed in the refrigeration machine oil, and a dispersant. The refrigeration machine oil preferably contains a polyvinyl ether, a polyol ester, a polyalkylene glycol, an alkylbenzene, or a mineral oil. The composition kit for a refrigeration machine of the present disclosure includes a refrigeration machine oil (A) containing a base oil and nanodiamond particles dispersed in the base oil, and a refrigerant (B).
1 . A composition for a refrigeration machine, the composition comprising:
a refrigeration machine oil;
nanodiamond particles dispersed in the refrigeration machine oil; and
a dispersant and
a refrigerant,
wherein a proportion of the nanodiamond particles contained in the composition for a refrigeration machine is from 1 to 500 mass ppm with respect to a total amount of the refrigeration machine oil.
2 . The composition for a refrigeration machine according to claim 1 , wherein the refrigeration machine oil contains a polyvinyl ether, a polyol ester, a polyalkylene glycol, an alkylated aromatic hydrocarbon compound, or a mineral oil.
3 . The composition for a refrigeration machine according to claim 1 , wherein the dispersant includes a dispersant (I) having a mass-average molecular weight of 500 or more and an amine value of 15 mg KOH/g or more and/or a fatty acid ester-based dispersant (II).
4 . The composition for a refrigeration machine according to claim 1 , wherein the refrigeration machine oil has an SP value of from 6.0 to 12.0 (cal/cm 3 ) 1/2 .
5 . The composition for a refrigeration machine according to claim 1 , wherein the composition has a friction coefficient of 0.08 or less when the composition is used as a lubricant in a ring-on-disk friction test under conditions of a surface pressure of 2 MPa and a speed of 1.5 m/s.
6 . The composition for a refrigeration machine according to claim 1 , wherein the composition is for use in a compressor of a refrigeration machine.
7 . The composition for a refrigeration machine according to claim 1 , wherein the refrigeration machine is an air conditioner.
8 . A composition kit for a refrigeration machine, the composition kit comprising:
a refrigeration machine oil (A) containing a base oil and nanodiamond particles dispersed in the base oil; and
a refrigerant (B),
wherein a proportion of the nanodiamond particles contained in the refrigeration machine oil for a refrigeration machine is from 1 to 500 mass ppm with respect to a total amount of the refrigeration machine oil.
9 . The composition kit for a refrigeration machine according to claim 8 , wherein the refrigeration machine oil (A) has a friction coefficient of 0.08 or less when the refrigeration machine oil (A) is used as a lubricant in a ring-on-disk friction test under conditions of a surface pressure of 2 MPa and a speed of 1.5 m/s.