Lubricating grease for space vehicle and preparation method thereof

Abstract

The invention discloses lubricating grease for a space aircraft and a preparation method thereof. The product comprises the following components in percentage by weight: 50-90% of basic oil, 2-20% of an anti-friction antiwear agent, 0.05-1.5% of a dispersant, 0.02-2% of an antioxidant, 1-10% of a thickening adjustor, 0.2-10% of a synergic lubricant and the balance of in-situ saponified compound lithium-based grease compounded. The product can reduce frictional wear of a typical friction pair of the space aircraft and prolong the service life of the aircraft in a space environment with the characteristics of high vacuum degree, strong radiation, elemental oxygen, high and low temperatures and the like. The product is good in lubricating performance, stable in quality and simple and convenient in preparation process, and has important application value in the lubricating field of the space aircrafts such as spacecrafts, artificial satellites and the like.

Description

1. Technical field [0001] The invention relates to the field of lubricating grease, in particular to a novel lubricating grease suitable for space vehicles and a preparation method thereof. 2. Background technology [0002] With the needs of countries around the world for space exploration, humans have developed a variety of space vehicles, including artificial earth satellites, space probes and manned spacecraft. For space vehicles, usually in the environment of high vacuum, strong radiation, atomic oxygen, high and low temperature, and microgravity for a long time, some have to travel to and from the earth or land on other celestial bodies, and experience various complex environments. After entering orbit, it still needs to serve in normal service for several months, several years or even ten years. Therefore, high reliability, long life and the ability to withstand complex environmental conditions are the basic requirements of a space vehicle, especially for its motion m...

AI Technical Summary

Problems solved by technology

In the past, space vehicles were mainly used in the military field. Due to the need for confidentiality, there were basically no reports on the corresponding space grease and its preparation method. The interaction and susceptibility in the environment are extremely complex, which poses new challenges to the lubrication performance of space grease in the space environment with the characteristics of high vacuum, strong radiation, atomic oxygen, high and low temperature, and microgravity.

Ohno N et al. reported two synthetic base oils 815Z and 2001A using perfluoropolyethers (PFPE) and polyalkylcyclopentanes (MACs) and their formation after thickening with polytetrafluoroethylene and sodium fatty acid, respectively. The effect of two greases 601EF and R2000 on the fatigue life of bearings [Ohno, N., Komiya, H., Morita, S., Mia, S., Satoh, N. and Obara, S. (2009), "Bearing Fatigue Life Tests in Advanced Base Oil and Grease for Space Application,” Tribol.Trans., 52, 1, pp114-120.], found that 815Z would degrade and release HF during friction, which would cause material corrosion, although 601EF and R2000 grease Can prolong the fatigue life of bearings, but their specific composition formula and preparation method have not been published

Chinese patent (200710145363.4) discloses a composite grease additive, its raw material composition is calculated by weight percentage: graphite 20-50%, dispersant 1-10%, thickener 5-10%, extreme pressure anti-wear agent 10% ~30%, the balance is base oil, it can be seen that the main lubricating component is graphite, and graphite needs to absorb moisture in the air to have good lubricity, so it cannot achieve corresponding lubricating effect in high vacuum space environment

U.S. Patent (USP4,298,481) discloses a kind of lubricating grease, mainly adopts 80~94% hydrogenated dimer carboxylic acid, 5~20% thickening agent, 0.2~6% additive preparation, and wherein additive part mainly comprises Oxygen agent, antirust agent, extreme pressure agent, etc., but most of the additives selected in this invention need to be synthesized by themselves, which greatly increases the manufacturing cost of lubricating grease, and the lubricating grease is mainly used at high temperature, and its fluidity at low temperature is poor Not suitable for application in space environment

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