Nano-attapulgite reinforced polyimide molding compound for oil sealing element and preparation method thereof

Abstract

The invention relates to a nano-attapulgite reinforced polyimide molding compound for an oil sealing element and a preparation method thereof. The nano-attapulgite reinforced polyimide molding compound comprises the following components in percentage by mass: 51 to 72 percent of polyimide matrix resin, 20 to 36 percent of glass fiber, 0 to 10 percent of molybdenum disulfide and 2 to 5 percent of modified attapulgite. The preparation method comprises the following steps of: adding the polyimide matrix, the glass fiber, the nano-attapulgite, the molybdenum disulfide and the like into a high-efficiency mixer in a certain ratio and mixing, wherein the mixing rotating speed is 10 to 50 revolutions per minute, the mixing times are 2 to 5 times, and the mixing time is 10 to 30 minutes each time;putting the mixture into a 50 to 200 DEG C drying oven to preheat for 10 to 50 hours; putting the mixture into a 40 to 200 DEG C die cavity, raising the temperature to 300 to 450 DEG C according to aprogram of 5 to 20 DEG C per minute and maintaining for 10 to 120 minutes; performing mould pressing, wherein the pressure of the mould pressing is 10 to 50MPa and the maintaining time of the mould pressing is 10 to 60 minutes; blowing to cool the mixture; maintaining the pressure in the cooling process and removing the pressure until the temperature is lower than 180 DEG C; demoulding; and performing finish machining to produce products with various specifications. The nano-attapulgite reinforced polyimide molding compound and the preparation method thereof overcome the defects that defects exist in the matrix because the raw materials are susceptible to aggregation and caking and are scattered and heated non-uniformly and the like in the conventional compression moulding process. The oil sealing product has the characteristics of high sealing property, corrosion resistance, temperature tolerance, high mechanical property and the like.

Description

technical field [0001] The invention relates to a polyimide molding compound for oil sealing and a manufacturing method thereof, in particular to a nano-attapulgite-reinforced polyimide molding compound for motor bearing oil sealing and a manufacturing method thereof. The invention belongs to the technical field of organic-inorganic nano composite material manufacturing. Background technique [0002] Bearing seals are widely used in AC and DC motors, turbogenerators, steam turbines, water turbines, fans, water pumps, compressors and other rotating machines, and are one of the key components in motor bearings. With the rapid development of industries such as electric power, petroleum, natural gas, plastics, chemical fertilizers, and ethylene, oil seal products have entered an era of rapid product renewal and large demand growth. How to solve the oil leakage problem of the oil seal is one of the tasks that the motor manufacturing industry and its supporting bearings and bushi...

AI Technical Summary

Problems solved by technology

In terms of sealing materials, traditional oil seals often use materials such as aluminum, copper, polytetrafluoroethylene, nylon, and Babbitt alloys. These materials have poor wear resistance, self-lubrication or temperature resistance, and the running time is slightly slower. The eccentric phenomenon of the seal to the rotating shaft will appear in the long run, the sealing gap is difficult to guarantee, and the leakage phenomenon is still relatively common.