Polyaryletherketone composite material, its preparation method and sealing ring using the material

Abstract

The invention belongs to the field of composite materials, and particularly relates to a polyaryletherketone composite material having high toughness, self-lubricating property, wear resistance and low hardness, a method for making the material and a sealing ring made of the material. The polyaryletherketone composite material consists of 92-95 parts by weight of copolyaryletherketone and 5-8 parts by weight of soft carbon, and also comprises a silane coupling agent added in an amount of 0.8-1.5 percent based on the weight of the soft carbon. The invention further discloses a simple preparation method of the material. The method mainly comprises the procedures of surface treatment, mixing, drying, hot pressing, cooling and demolding. The invention further discloses a sealing ring made of the material. By using the sealing ring, an efficient sealing effect can be achieved on a specified component of nuclear industrial equipment. The sealing ring made of the polyaryletherketone composite material can fully meet the sealing requirements under the special working conditions of high temperature, high pressure and the like in the field of nuclear industry. By using the sealing ring, leakage of nuclear media is prevented, and the safety of personnel and equipment is ensured.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a polyaryletherketone composite material with high toughness, self-lubrication, wear resistance and low hardness, as well as a method for making the material and a sealing ring using the material. Background technique [0002] The U-shaped sealing ring is a lip-shaped sealing ring, which can be installed on the moving piston or on the stationary housing, without the need for a packing gland or pressure ring, and can be used alone. The U-shaped sealing ring is a balanced seal, which can seal both the inner diameter and the outer diameter direction, and has a self-compensating sealing function as the pressure of the medium changes. At present, most U-shaped sealing rings are made of rubber or compound rubber, such as polyurethane rubber, nitrile rubber, fluorine rubber, cloth rubber, etc. Rubber materials have excellent elasticity and self-compensating sealing functio...

AI Technical Summary

Problems solved by technology

At present, most U-shaped sealing rings are made of rubber or compound rubber, such as polyurethane rubber, nitrile rubber, fluorine rubber, cloth rubber, etc. Rubber materials have excellent elasticity and self-compensating sealing functions, but the coefficient of friction is relatively large. , poor wear resistance, low temperature resistance

In the field of nuclear industry, the seals used in equipment often encounter harsh working conditions such as high temperature (maximum working temperature 240°C), radiation, high pressure, and mixed media. Most rubber seals are prone to aging and deformation, and their service life is short, which cannot meet the sealing requirements. , so now there is an urgent need for a new material to replace these rubber sealing materials, in order to make it have many properties such as radiation resistance, high temperature resistance, self-lubrication, wear resistance, etc., to solve the sealing and leakage problems of nuclear industry equipment

[0003] Polyaryletherketone is a special polymer material containing aromatic groups, ether groups, ketone groups and other functional groups. This chemical structure determines its radiation resistance, high temperature resistance (long-term use temperature is higher than 300 ° C), high strength and high toughness. And other performance characteristics, can meet some basic performance requirements of seals in the nuclear industry, but this type of material has high hardness, poor self-lubrication, easy to damage the wear parts, and reduce the service life of the seals. Although the ether ketone composite material can improve self-lubricating performance and wear resistance; but the addition of related additives will increase the brittleness of the material and greatly reduce the toughness and elongation at break of the material (the tensile strength of a certain brand of polyaryletherketone resin The elongation at break is 30%, and the value drops to 4.9% after compound modification with other materials), which affects the sealing compensation performance and is not suitable for processing into U-shaped sealing rings

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