High-temperature oxidation resistant low-viscosity synthetic ester as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of chemical synthetic materials, particularly relates to high-temperature-oxidation-resistant low-viscosity synthetic ester, and further discloses a preparation method and application of the high-temperature-oxidation-resistant low-viscosity synthetic ester. The high-temperature oxidation resistant low-viscosity synthetic ester disclosed by the invention is prepared by reacting trimethylolpropane, neopentyl glycol, succinic acid, 1, 4-cyclohexanedicarboxylic acid, 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid, xylene, triethylchlorosilane and tripropylchlorosilane which are used as main raw materials. The synthetic ester product with low viscosity, excellent high-temperature resistance and appropriate viscosity index is obtained, and the synthesized synthetic ester product has excellent long-time heat resistance (300 DEG C or below), good oxidation resistance and coking resistance and moderate viscosity index, so that the synthetic ester product is suitable for being used as an air compressor oil product and high-end heat-conducting oil with higher performance requirements, and has wide application prospects. And the production cost of the product is low, and the economic benefit is high.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis materials, in particular to a high-temperature oxidation-resistant low-viscosity synthetic ester, and further discloses its preparation method and application. Background technique [0002] Air compressor oil refers to the liquid lubricant used on various types of machinery to reduce friction and protect machinery and processed parts. It mainly plays the roles of lubrication, cooling, rust prevention, cleaning, sealing and buffering. The principle of air compressor oil is to form a protective film between the two friction pairs to avoid direct contact between metal and metal, thereby buffering the effect of friction and lubricating, thereby reducing wear and making the machine operate normally. [0003] At present, the base oil of air compressor oil generally accounts for more than 95% of the finished oil, so the quality of the base oil will be directly related to the quality level of t...

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Problems solved by technology

However, the above-mentioned raw materials are all ordinary carbon chain structures, and their own oxidation resistance is not outstanding, and the precipitation of carbon deposits is more obvious under long-term operation above 200 °C

Ordinary synthetic ester lubricants either have too small a molecular weight, such as dioctyl phthalate, which is prone to high-temperature oxidation, or have too high a viscosity. Although they have excellent high-temperature resistance, they are not suitable for use in air compressor oil and heat transfer oil systems. middle

[0005] Although silicone oil products have good high temperature resistance, the continuous anti-oxidation performance of the product is still insufficient, especially in reciprocating compressors, the continuous contact between the lubricating oil at the piston part of the cylinder and the hot compressed air will still slowly cause the oxidation of the oil, Decompose, and then produce colloid and various acid substances, and silicone oil is too hydrophobic, if it is used as a lubricating oil base oil, a small amount of the above-mentioned degradation products generated cannot be effectively dispersed in it, which will cause these degradation products on the metal surface deposition leads to carbon deposition

Therefore, high content of silicone oil is also not suitable for use as lubricating oil for air compressors

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