Lubricating oil for refrigeration compressor and preparation method thereof
A refrigeration compressor and lubricating oil technology, applied in the field of refrigeration oil and lubricating oil, can solve the problems of accelerating the swelling of rubber components, reducing the compatibility of refrigerants, and easy swelling of rubber components, so as to improve efficiency and reduce oil retention. , the effect of good low temperature fluidity
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[0040] A second aspect of the present invention also provides a method for preparing the above-mentioned lubricating oil for a refrigeration compressor, comprising the following steps:
[0041] S1: Pour the above molar ratio of pentaerythritol and mixed fatty acid into the reaction kettle, add catalyst, react for 8-10h under the condition that the reaction temperature is 110-130°C and the vacuum degree is -0.1Mpa, and then the temperature is raised to 180-250°C , react for 1-2h, then feed nitrogen into the reaction kettle for 0.5-1h to obtain base oil;
[0042] S2: adding the above-obtained base oil, antioxidant, acid scavenger, anti-wear agent, and anti-foaming agent to the blending kettle, and reacting in a vacuum for 0.5-1 h to obtain the lubricating oil.
[0043]In some preferred embodiments, in step S2, the acid value of the lubricating oil is less than or equal to 0.01 mgKOH / g. The acid value of the lubricating oil can be lower than 0.01 mgKOH / g through the selection of...
Embodiment 1
[0050] Embodiment 1 provides a lubricating oil for a refrigeration compressor, which, in terms of mass percentage, comprises 95% of polyol ester, 0.3% of antioxidant, 2.995% of acid scavenger, 1.7% of anti-wear agent, and 0.005% of anti-foaming agent.
[0051] The polyol ester is obtained by reacting pentaerythritol with a mixed fatty acid composed of isooctanoic acid and n-hexanoic acid.
[0052] The molar ratio of the pentaerythritol to the mixed fatty acid is 0.8:2.
[0053] The mass ratio of isooctanoic acid and n-hexanoic acid is 30%: 70%.
[0054] The antioxidant is distearyl thiodipropionate.
[0055] The acid scavenger is ethylene glycol diglycidyl ether.
[0056] The antiwear agent is preferably tricresyl phosphate.
[0057] The antifoaming agent is polydimethylsiloxane.
[0058] This example also provides a method for preparing the above-mentioned lubricating oil for refrigeration compressors, comprising the following steps:
[0059] S1: Pour the pentaerythritol...
Embodiment 2
[0062] Embodiment 2 provides a lubricating oil for a refrigeration compressor, which, in terms of mass percentage, comprises 98% of polyol ester, 0.3% of antioxidant, 0.69% of acid scavenger, 1% of antiwear agent, and 0.01% of antifoaming agent.
[0063] The polyol ester is obtained by reacting pentaerythritol with a mixed fatty acid composed of isooctanoic acid and n-hexanoic acid.
[0064] The molar ratio of the pentaerythritol to the mixed fatty acid is 1:2.6.
[0065] The mass ratio of isooctanoic acid and n-hexanoic acid is 50%: 50%.
[0066] The antioxidant is distearyl thiodipropionate.
[0067] The acid scavenger is ethylene glycol diglycidyl ether.
[0068] The antiwear agent is preferably tricresyl phosphate.
[0069] The antifoaming agent is polydimethylsiloxane.
[0070] This example also provides a method for preparing the above-mentioned lubricating oil for refrigeration compressors, comprising the following steps:
[0071] S1: Pour the pentaerythritol and m...
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