Method for preparing tube blank of holder by polyimide with nano-copper and polytetrafluoroethylene

Abstract

The invention relates to a method for preparing a tube blank of a holder by polyimide with nano-copper and polytetrafluoroethylene. The method comprises the following steps of: firstly, pre-treating a certain amount of nano-copper, polyimide and polytetrafluoroethylene; secondly, re-proportioning a certain amount of nano-copper, polyimide and polytetrafluoroethylene in parts by weight and preparing a polyimide composite material; thirdly, conducting ball-milling on the prepared polyimide composite material; and fourthly, preparing the tube blank of the holder by hot press on a hot-press. The tube blank of the holder is maximally characterized in that the distortion temperature of the tube blank of the holder reaches over 270 DEG C at 1.80 MPa according to GB / T1634.2-2004 standard, the heat conductivity measured by HotDisk 2500S heat conductivity coefficient measuring meter reaches over 0.2W / (m.K), so that the tensile strength of polyimide is remained, the distortion temperature and heat conductivity of polyimide are improved, and the wear resistance and lubricity of polyimide are improved by nano-copper and polytetrafluoroethylene.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a method for making a cage tube blank by adding nano-copper and polytetrafluoroethylene to polyimide. Background technique [0002] Due to its low density and light weight, polyimide is often used to make bearing cage blanks. It has the advantages of high tensile strength, wear resistance and good self-lubrication at room temperature. [0003] However, the glass transition temperature of domestic polyimide is low, the temperature resistance is poor, especially the tensile strength is low when it is not more than 260 ° C, and the low heat distortion temperature is one of the problems of polyimide. . [0004] Low thermal conductivity is the second problem of polyimide, and the thermal conductivity of polyimide is ≤0.15 W.(m.K) -1 , When the thermal conductivity is small, the heat accumulated rapidly on the friction surface of the cage cannot be conducted a...

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Problems solved by technology

[0003] However, the glass transition temperature of domestic polyimide is low, the temperature resistance is poor, especially the tensile strength is low when it is not more than 260 ° C, and the low heat distortion temperature is one of the problems of polyimide.

[0004] Low thermal conductivity is the second problem of polyimide, and the thermal conductivity of polyimide is ≤0.15 W.(m.K) -1 , when the thermal conductivity is small, the heat accumulated rapidly on the friction surface of the cage cannot be conducted away, which will soften the surface of the cage and aggravate wear, which will seriously affect the normal operation of the bearing and shorten the service life

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