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Nylon 66 composite material and preparation method

A composite material, nylon technology, applied in the field of nylon 66 composite materials, can solve the problems of reducing product stability and service life, limiting application, affecting dimensional stability and mechanical properties, etc., achieving good mechanical properties, improving comprehensive mechanical properties, The effect of anti-friction

Active Publication Date: 2017-05-17
JIANGSU BOILN PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some performance defects. Due to the amide group (a polar group) in its structure, nylon 66 will be thermally degraded and hydrolyzed in an environment of high temperature, humidity or ultraviolet radiation, thereby affecting the dimensional stability of its products. Sexuality and mechanical properties, reducing the stability and service life of the product, these factors limit the application of nylon 66 materials

Method used

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  • Nylon 66 composite material and preparation method
  • Nylon 66 composite material and preparation method
  • Nylon 66 composite material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation of embodiment 1, Ekonol (0.2%) / nylon 66 material

[0017] A nylon 66 composite material is composed of 80% nylon 66, 15% polytetrafluoroethylene, 4.8% flexible graphite and 0.2% Ekonol in terms of mass percentage.

[0018] The preparation method is as follows: firstly add 80% nylon 66 and heat to 320°C to melt, then add 15% polytetrafluoroethylene and 4.8% flexible graphite at the same time, and stir evenly. Add 0.2% Ekonol, stir evenly, continue heating during this process, and keep the temperature of the mixture at 320°C. Extrude the molten nylon 66 composite material into the sealing ring forming mold with a screw injection machine, hold the pressure and form it, and take out the sealing ring after cooling. The sealing ring made of this technology and nylon 66 composite material has a tensile strength of 120-124MPa, a shear strength of 61-65MPa, a compressive strength of 159-162MPa, and a flexural strength of 171-174MPa.

Embodiment 2

[0019] Embodiment 2, the preparation of Ekonol (0.3%) / nylon 66 material

[0020] A nylon 66 composite material is composed of 80% nylon 66, 15% polytetrafluoroethylene, 4.7% flexible graphite and 0.3% Ekonol in terms of mass percentage.

[0021] The preparation method is as follows: firstly add 80% nylon 66 and heat to 320°C to melt, then add 15% polytetrafluoroethylene and 4.7% flexible graphite at the same time, and stir evenly. Add 0.3% Ekonol, stir evenly, keep heating during this process, and keep the temperature of the mixture at 320°C. Extrude the molten nylon 66 composite material into the sealing ring forming mold with a screw injection machine, hold the pressure and form it, and take out the sealing ring after cooling. The seal ring made of this technology and nylon 66 composite material has a tensile strength of 117-122MPa, a shear strength of 60-63MPa, a compressive strength of 163-168MPa, and a flexural strength of 170-175MPa.

Embodiment 3

[0022] Embodiment 3, the preparation of Ekonol (0.5%) / nylon 66 material

[0023] The nylon 66 composite material used for pipeline sealing rings is composed of 80% nylon 66, 15% polytetrafluoroethylene, 4.5% flexible graphite, and 0.5% Ekonol in terms of mass percentage. .

[0024] The preparation method is as follows: firstly add 80% nylon 66 and heat to 320°C to melt, then add 15% polytetrafluoroethylene and 4.5% flexible graphite at the same time, and stir evenly. Add 0.5% Ekonol, stir evenly, keep heating during this process, and keep the temperature of the mixture at 320°C. Extrude the molten nylon 66 composite material into the sealing ring forming mold with a screw injection machine, hold the pressure and form it, and take out the sealing ring after cooling. The sealing ring made of this technology and nylon 66 composite material has a tensile strength of 123-126MPa, a shear strength of 69-73MPa, a compressive strength of 163-169MPa, and a flexural strength of 174-177...

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Abstract

The invention discloses a nylon 66 composite material for a petrochemical pipeline sealing ring. The nylon 66 composite material is prepared from the following components in percentage by weight: 80 percent of nylon 66, 15 percent of polytetrafluoroethylene, 4 percent to 4.8 percent of flexible graphite and 0.2 percent to 1 percent of Ekonol (polyhydroxybenzoate). Compared with an existing nylon 66 and SiO2 / nylon 6 composite material, the wearing resistance, heat resistance and hydrolysis resistance of the nylon 66 composite material disclosed by the invention are remarkably improved; the nylon 66 composite material can keep a long-time sealing performance under the condition that the natural environment is bad and is more suitable for related fields of petrochemical industry and the like.

Description

technical field [0001] The invention relates to a sealing material, in particular to a nylon 66 composite material used for sealing rings of petrochemical pipelines. Background technique [0002] Rubber sealing ring is the most commonly used sealing form, which has the advantages of simple structure and reliable sealing, but the performance defects of rubber sealing ring limit its application in many fields. The degree of sealing of spacecraft has an important impact on the safety of internal equipment, and for manned spacecraft, the quality of mechanism sealing performance has a greater impact. Aerospace vehicles have to go through temperature changes of low temperature -70 ℃ and high temperature 70 ℃ when they are running in space. The material properties of rubber materials are very different with temperature changes. Therefore, the sealing performance of space vehicles at different temperatures should be analyzed. The direct cause of the "Challenger" crash was that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08L27/18C08L67/04C08K3/04
CPCC08L77/06C08L2201/08C08L2205/03C08L27/18C08L67/04C08K3/04
Inventor 龚伟
Owner JIANGSU BOILN PLASTICS CO LTD