1. A pure ester type refrigerator oil composition comprises the following components in parts by weight:

95-99 parts of pentaerythritol ester; 0.1-1 part of antioxidant; 0.01-1 part of an anticorrosive agent; 0.0001-1 part of an antifoaming agent; 0.1-1 part of an acid trapping agent; and 0.1-2 parts of an antiwear agent;

the pentaerythritol ester is selected from a pentaerythritol ester and/or a dipentaerythritol ester.

2. The pure ester refrigerator oil composition of claim 1 wherein the pentaerythritol ester is prepared by reacting an alkyl acid and pentaerythritol;

the alkyl acid is selected from one or more of n-pentanoic acid, isononanoic acid, n-heptanoic acid and isooctanoic acid.

3. The pure ester-type refrigerator oil composition according to claim 1, wherein the pentaerythritol ester is prepared by reacting n-pentanoic acid, isononanoic acid, and dipentaerythritol;

or the pentaerythritol ester is prepared by the reaction of n-pentanoic acid, isononanoic acid and monopentaerythritol;

or the pentaerythritol ester is prepared by the reaction of isooctanoic acid, isononanoic acid and monopentaerythritol.

4. The pure ester-type refrigerator oil composition according to claim 1, wherein the corrosion inhibitor is selected from azoles and derivatives thereof;

the antioxidant is selected from one or more of naphthylamine, arylamine and phenolic antioxidant;

the anti-foaming agent is selected from methyl silicone oil and/or fluorosilicone oil.

5. The pure ester refrigerator oil composition of claim 1 wherein the acid scavenger is selected from the group consisting of t-butyl glycidyl ester;

the antiwear agent is selected from tricresyl phosphate;

the corrosion inhibitor is selected from alkylated benzotriazole;

the anti-foaming agent is selected from No. 10000 fluorosilicone oil.

6. A method for preparing the pure ester refrigerator oil composition of any one of claims 1 to 5, comprising the steps of:

mixing 95-99 parts of pentaerythritol ester, 0.1-1 part of antioxidant, 0.01-1 part of anticorrosive agent, 0.0001-1 part of antifoaming agent, 0.1-1 part of acid trapping agent and 0.1-2 parts of antiwear agent, dissolving at 75-85 ℃, and filtering to obtain the pure ester type refrigerator oil composition.

7. The pure ester refrigerator oil composition of any one of claims 1 to 5 or the pure ester refrigerator oil composition prepared by the preparation method of claim 6 is used in combination with R22 refrigerant, R134a refrigerant or R32 refrigerant.

Background

With the limited use of CFC and HCFC of refrigerating machine refrigerant and the development of HFC environment-friendly refrigerant with zero ozone consumption potential, the ester type refrigerating machine oil has good compatibility with refrigerant, excellent high and low temperature performance and environment protection, and wide prospect.

When the compressor is actually used, the refrigerating machine oil is exposed to an environment of high temperature, high pressure and moisture for a long time, and therefore, the refrigerating machine oil is easily deteriorated, and even an acid value is increased to corrode metals, and "sludge" may be formed to clog a system or deteriorate performance, thereby affecting the life of the compressor. In addition, the phase separation of the refrigerating machine oil and the refrigerant in the refrigeration cycle has an effect on the refrigeration efficiency and the service life of the refrigeration system. The hydrolytic stability of the oil affects the operating conditions of the refrigerator oil in the compressor. Therefore, the heat stability, electrical property and hydrolysis performance of the refrigerator oil are very critical to the normal use of the oil besides the compatibility of the oil.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a pure ester type refrigerating machine oil composition, a preparation method and an application thereof, wherein the refrigerating machine oil composition has good compatibility with a refrigerant having R134a or R22 or R32.

The invention provides a pure ester type refrigerator oil composition which comprises the following components in parts by weight:

95-99 parts of pentaerythritol ester; 0.1-1 part of antioxidant; 0.01-1 part of an anticorrosive agent; 0.0001-1 part of an antifoaming agent; 0.1-1 part of an acid trapping agent; and 0.1-2 parts of an antiwear agent;

the pentaerythritol ester is selected from a pentaerythritol ester and/or a dipentaerythritol ester.

In the present invention, the pentaerythritol ester is prepared by reacting an alkyl acid and pentaerythritol;

the alkyl acid is selected from one or more of n-pentanoic acid, isononanoic acid, n-heptanoic acid and isooctanoic acid.

In the present invention, theThe pentaerythritol ester is prepared by reacting n-pentanoic acid, isononanoic acid and dipentaerythritol, and has viscosity of 240mm at 40 DEG C²/s；

Or the pentaerythritol ester is prepared by the reaction of n-pentanoic acid, isononanoic acid and monopentaerythritol, and has the viscosity of 101.48mm at 40 DEG C²/s；

Or the pentaerythritol ester is prepared by the reaction of isooctanoic acid, isononanoic acid and monopentaerythritol, and has the viscosity of 77.21mm at 40 DEG C²/s。

In the present invention, the corrosion inhibitor is selected from azoles and derivatives thereof;

the antioxidant is selected from one or more of naphthylamine, arylamine and phenolic antioxidant;

the anti-foaming agent is selected from methyl silicone oil and/or fluorosilicone oil.

In the present invention, the acid trapping agent is selected from tert-butyl glycidyl ester;

the antiwear agent is selected from tricresyl phosphate;

the corrosion inhibitor is selected from alkylated benzotriazole;

the anti-foaming agent is selected from No. 10000 fluorosilicone oil.

In the specific embodiment of the invention, the pure ester type refrigerator oil composition comprises the following components in parts by weight:

96.2 parts of pentaerythritol ester; 0.5 part of diisooctyl diphenylamine; 0.25 part of N-phenyl-alpha naphthylamine; 0.05 part of alkylated benzotriazole; 20ppm of fluorosilicone oil; 1.0 part of tert-butyl glycidyl ester; and 2.0 parts of tricresyl phosphate.

In the invention, the pure ester type refrigerator oil composition in the technical scheme is matched with R22 refrigerant, R134a refrigerant, R32 refrigerant or R32 refrigerant for use.

The invention provides a preparation method of the pure ester type refrigerating machine oil composition in the technical scheme, which comprises the following steps:

mixing 95-99 parts of pentaerythritol ester, 0.1-1 part of antioxidant, 0.01-1 part of anticorrosive agent, 0.0001-1 part of antifoaming agent, 0.1-1 part of acid trapping agent and 0.1-2 parts of antiwear agent, dissolving at 75-85 ℃, and filtering to obtain the pure ester type refrigerator oil composition.

The invention provides a pure ester type refrigerator oil composition in the technical scheme or a pure ester type refrigerator oil composition prepared by the preparation method in the technical scheme, which is matched with an R22 refrigerant, an R134a refrigerant or an R32 refrigerant for use.

The invention provides a pure ester type refrigerator oil composition which comprises the following components in parts by weight: 95-99 parts of pentaerythritol ester; 0.1-1 part of antioxidant; 0.01-1 part of an anticorrosive agent; 0.0001-1 part of an antifoaming agent; 0.1-1 part of an acid trapping agent; and 0.1-2 parts of an antiwear agent; the pentaerythritol ester is selected from a pentaerythritol ester and/or a dipentaerythritol ester. The refrigerator oil composition provided by the invention is a pure ester type, can effectively ensure the compatibility of oil products and refrigerants (R22 refrigerants or R134a refrigerants or R32 refrigerants) of refrigerators of industrial refrigeration and household air-conditioners under the combined action of the components, also has excellent hydrolytic property, dielectric property and lubricating property, and meets the requirement of long-time operation of the refrigerators.

Detailed Description

To further illustrate the present invention, the following examples are provided to describe a pure ester refrigerator oil composition, its preparation method and application in detail, but they should not be construed as limiting the scope of the present invention.

Synthesis of refrigerator oil No. 1220

96.2 parts of a polymer with the viscosity of 240mm at 40 DEG C²0.5 part of diisooctyl diphenylamine, 0.25 part of N-phenyl-alpha naphthylamine and 0.05 part of alkylated benzotriazole, wherein 20ppm of No. 10000 fluorosilicone oil, 1.0 part of tert-butyl glycidyl ester (E10P) and 2.0 parts of antiwear agent tricresyl phosphate (TCP) are adopted, and the components are dissolved and filtered at 80 ℃ to obtain No. 220 ester type refrigerating machine oil.

Table 1 performance test results for refrigerator oil prepared in example 1

Synthesis of refrigerator oil No. 2100 in example

96.2 portions of 101.48mm viscosity at 40 DEG C²Pentaerythritol ester (prepared by reacting N-pentanoic acid, isononanoic acid and monopentaerythritol), 0.5 part of diisooctyl diphenylamine, 0.25 part of N-phenyl-alpha naphthylamine, 0.05 part of alkylated benzotriazole, 20ppm of No. 10000 fluorosilicone oil, 1.0 part of tert-butyl glycidyl ester (E10P) and 2.0 parts of antiwear agent tricresyl phosphate (TCP) are adopted, and the ester type refrigerating machine oil No. 100 is obtained by dissolving and filtering at 80 ℃.

Table 2 performance test results for refrigerator oil prepared in example 2

Synthesis of refrigerator oil No. 375 example

96.2 parts of a polymer with a viscosity of 77.21mm at 40 DEG C²Pentaerythritol ester (prepared by reaction of isooctanoic acid, isononanoic acid and monopentaerythritol), 0.5 part of diisooctyl diphenylamine, 0.25 part of N-phenyl-alpha naphthylamine, 0.05 part of alkylated benzotriazole, 20ppm of No. 10000 fluorosilicone oil, 1.0 part of tert-butyl glycidyl ester (E10P) and 2.0 parts of antiwear agent tricresyl phosphate (TCP) by dissolving at 80 ℃ and filtering to obtain No. 75 ester type refrigerating machine oil.

Table 3 performance test results for refrigerator oil prepared in example 3

From the above examples, the invention provides a pure ester type refrigerator oil composition, which comprises the following components in parts by weight: 95-99 parts of pentaerythritol ester; 0.1-1 part of antioxidant; 0.01-1 part of an anticorrosive agent; 0.0001-1 part of an antifoaming agent; 0.1-1 part of an acid trapping agent; and 0.1-2 parts of an antiwear agent; the pentaerythritol ester is selected from a pentaerythritol ester and/or a dipentaerythritol ester. The refrigerator oil composition provided by the invention is a pure ester type, can effectively ensure the compatibility of oil products and refrigerants (R22 refrigerants or R134a refrigerants or R32 refrigerants) of refrigerators of industrial refrigeration and household air-conditioners under the combined action of the components, also has excellent hydrolytic property, dielectric property and lubricating property, and meets the requirement of long-time operation of the refrigerators.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.