Porous polyimide composite material for bearing retainer, preparation method of porous polyimide composite material and bearing retainer

Abstract

The invention belongs to the technical field of bearing materials, and relates to a porous polyimide composite material for a bearing retainer, a preparation method of the porous polyimide composite material and the bearing retainer. The porous polyimide composite material for the bearing retainer is prepared by limiting, pressing and sintering the following raw materials in percentage by mass: 92-97% of monoether anhydride polyimide and 3-8% of polytetrafluoroethylene, wherein the monoether anhydride polyimide is prepared by polycondensation, dehydration and cyclization of 4, 4 '-oxybisphthalic anhydride and 4, 4'-diaminodiphenyl ether. Under the condition that the porosity of the composite material is equivalent to that of an existing material, the strength of the composite material canbe remarkably improved, so that the strength performance of the composite material is compatible with micropore characteristics, long-term use of the retainer after one-time oiling is facilitated, andthe service life of a bearing is prolonged under the condition that the requirements of harsh bearing working conditions are met.

Description

technical field [0001] The invention belongs to the technical field of bearing materials, and in particular relates to a porous polyimide composite material for a bearing cage, a preparation method thereof, and a bearing cage. Background technique [0002] The porous polyimide cage material has high mechanical strength, high penetration rate of internal micropores, strong adjustability of microporous characteristics (pore size, porosity and pore size distribution), excellent wear resistance and good compatibility with lubricating oil, etc. Advantages, as a lubricant medium carrier, it can realize long-term on-demand in-situ supply, and ensure stable, reliable, and long-life operation of the bearing. It is widely used in bearings such as satellite derotation antennas, satellite attitude control flywheels, and navigators. [0003] The initial porous polyimide cage material is prepared by pure polyimide molding powder, such as the porous polyimide cage material disclosed in the...

AI Technical Summary

Problems solved by technology

[0005] The problems existing in the existing porous polyimide cage materials are mainly manifested in the large pore diameter, high porosity (oil content) and low oil retention rate, difficulty in balancing mechanical properties and porosity (oil content), and microporosity. The one-way control ability of the characteristics is weak, and the materials with the target pore size cannot be accurately obtained, etc.

At the same time, the material molding is affected by the low level of automation and poor precision of the equipment, the sintering process is affected by factors such as the poor temperature accuracy of the traditional sintering furnace, and the porous polyimide cage material has relatively poor batch consistency.

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