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Lubricant for tetrafluoroethane refrigerant

A technology of tetrafluoroethane and refrigerant, applied in lubricating compositions, additives, petroleum industry, etc., can solve the problems of increasing acid value, poor reproducibility of chemical composition, poor heat resistance and anti-aging performance, and achieve stable Reproducibility, good miscibility, cooling effect, and stable comprehensive performance

Inactive Publication Date: 2006-08-02
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the aliphatic chain structure, this ester-type lubricating oil has poor heat resistance and anti-aging performance, especially it is easy to pyrolyze and hydrolyze to increase the acid value
In addition to using several polyols and several fatty acid mixtures in the esterification reaction process, the linear carboxylic acid and the branched carboxylic acid have a great difference in the reaction speed due to the size of the steric hindrance. Compositional reproducibility is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] 1. Refer to the following mass percentage composition for implementation:

[0024] 1,3,5-tris(ethylhexanoate)isocyanurate 22.5%

[0025] 1,3,5-tris(ethyl isooctanoate) isocyanurate 27.5%

[0026] 2,2-Dimethyl-1,3-propanediol bis-isocaprylate 50.0%

[0027] 1.1, Preparation of 1,3,5-three (ethyl hexanoate) isocyanurate

[0028] In a 3L four-necked round-bottomed flask equipped with a mechanical stirrer, a thermometer, an oil-water separation device, and a reflux condenser, drop 522g (2mol) of 1,3,5-trihydroxyethyl isocyanurate, and 800ml of decahydronaphthalene , 3g of p-toluenesulfonic acid, 836g (7.2mol) of n-hexanoic acid, heated, reflux began at 170 ° C, with the continuous separation of water, the temperature continued to rise, up to 210 ° C, when the water output reached the theoretical amount, almost no longer Water is produced, stop the reaction, cool to room temperature, add 200ml of water to wash, and concentrate the separated oil phase to remove decahydrona...

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PUM

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Abstract

This invention, a kind of lube for tetrafluoroethane refrigerant, relates to lubricant. It solves problems about weak heat resistance, short-time ageing resistance, and hard rerrence of chemial components. It adopts isocyanurate's heterocyclic carbon-nitrogen unit which has strong heat resistance and good ageing resistance. It also adopts single acid and polyol to react to produce three kinds of clear structure liquid compound, the weight percent of which is: 18-27% diethyl adipate, 22-33% isooctanoic adipate, 40-60% 2,2-dimethyel-1,3-propanediol. In short, the invention mainly used as refrigerant.

Description

technical field [0001] The invention is a lubricating oil for tetrafluoroethane refrigerant, which belongs to lubricants and is mainly used for refrigerants and the like. Background technique [0002] The refrigerants used in the past are chlorofluorocarbons (CFCs), which have a damaging effect on the earth's ozone layer. Therefore, developing countries will completely ban and use such refrigerants from January 1, 2006. Tetrafluoroethane refrigerant is currently recognized as the best substitute for CFC. However, due to its greater polarity than the former, it is physically immiscible with conventional petroleum-based lubricants. [0003] At present, the refrigeration lubricating oil at home and abroad is using ester lubricating oil instead of petroleum-based lubricating oil to solve the miscibility. But these ester lubricating oils are all prepared from aliphatic polyols, such as neopentyl glycol, trimethylolpropane, pentaerythritol, etc. U.S. Patent 6350392 reports a ki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M133/20
Inventor 甘孝贤丘少君卢先明张志刚王光碧胡中波张殿红邢颖
Owner XIAN MODERN CHEM RES INST
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