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Modification formula for enhancing toughness and prolonging service lifetime of polytetrafluoroethylene

A technology of polytetrafluoroethylene toughness and polytetrafluoroethylene, which is applied in the field of enhanced polytetrafluoroethylene toughness and service life modification formula, can solve the problem of poor sealing performance and service life of single lip structure, and it is difficult to pass a million times Life testing, not being able to fit the sealing surface well, etc., to achieve the effect of reducing the burden on the environment, low production costs, and low machine requirements

Inactive Publication Date: 2022-02-25
上海佳珊赫新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the seal of the vehicle-mounted turbine bypass valve is mainly based on the double-lip structure, and the sealing performance and service life of the single-lip structure are not good. If the sealing surface is not sealed, the sealing performance will be reduced. At the same time, if the sealing performance is satisfied, it is difficult to pass the million-cycle life test required by the automotive test.
[0003] The hardness of normal modified PTFE is higher than that of pure PTFE. It has high strength but poor toughness. For application scenarios such as turbocharger bypass valve sealing, not only the sealing performance must be considered, but also the use must be considered Life, the normal modified PTFE formula, it is difficult to meet the required toughness requirements to achieve a single-lip compression seal, and it cannot meet the life requirements of the million-time thermal shock test

Method used

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  • Modification formula for enhancing toughness and prolonging service lifetime of polytetrafluoroethylene
  • Modification formula for enhancing toughness and prolonging service lifetime of polytetrafluoroethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , a modified formula for enhancing the toughness and service life of polytetrafluoroethylene, comprising the following steps:

[0028] S1: Raw material preparation, selecting raw materials with a weight ratio of 91% of pure polytetrafluoroethylene powder and 9% of machine masterbatch powder for preparation;

[0029] S2: Mixing materials, placing the tetrafluoroethylene powder obtained in S1 and the machine masterbatch powder in the mixing impurities for mixing to obtain mixed raw materials;

[0030] S3: Molding, placing the mixed raw material obtained in S2 in a molding device, and forming it into a raw material embryo through an isostatic pressing process;

[0031] S4: sintering, the raw material embryo obtained in S3 is heated and shaped by a heating device.

[0032] The pure polytetrafluoroethylene powder in S1 is 100% suspension method polytetrafluoroethylene resin, the appearance is white powder, the technical index of tensile strength is greater tha...

Embodiment 2

[0038] see figure 1 , a modified formula for enhancing the toughness and service life of polytetrafluoroethylene, comprising the following steps:

[0039] S1: Preparation of raw materials, select raw materials with a weight ratio of 95% of pure polytetrafluoroethylene powder and 5% of machine masterbatch powder for preparation;

[0040] S2: Mixing materials, placing the tetrafluoroethylene powder obtained in S1 and the machine masterbatch powder in the mixing impurities for mixing to obtain mixed raw materials;

[0041] S3: Molding, placing the mixed raw material obtained in S2 in a molding device, and forming it into a raw material embryo through an isostatic pressing process;

[0042] S4: sintering, the raw material embryo obtained in S3 is heated and shaped by a heating device.

[0043] The pure polytetrafluoroethylene powder in S1 is 100% suspension method polytetrafluoroethylene resin, the appearance is white powder, the technical index of tensile strength is greater th...

Embodiment 3

[0049] see figure 1 , a modified formula for enhancing the toughness and service life of polytetrafluoroethylene, comprising the following steps:

[0050] S1: Raw material preparation, select raw materials with a weight ratio of 93% of pure polytetrafluoroethylene powder and 7% of machine masterbatch powder for preparation;

[0051] S2: Mixing materials, placing the tetrafluoroethylene powder obtained in S1 and the machine masterbatch powder in the mixing impurities for mixing to obtain mixed raw materials;

[0052] S3: Molding, placing the mixed raw material obtained in S2 in a molding device, and forming it into a raw material embryo through an isostatic pressing process;

[0053] S4: sintering, the raw material embryo obtained in S3 is heated and shaped by a heating device.

[0054] The pure polytetrafluoroethylene powder in S1 is 100% suspension method polytetrafluoroethylene resin, the appearance is white powder, the technical index of tensile strength is greater than o...

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Abstract

The invention relates to the technical field of polytetrafluoroethylene production, and discloses a modification formula for enhancing toughness and prolonging service lifetime of polytetrafluoroethylene, which comprises the following steps: S1, preparing raw materials; S2, mixing the materials; S3, mold pressing; S4, sintering. the modified polytetrafluoroethylene produced by the invention can enable a turbocharging bypass valve of a fuel automobile to be better in sealing performance, and can bear more than three million times of cold and hot impact tests, so that the service lifetime of a sealing product is considered, the sealing product can play a sealing role in a required service cycle. The formula has the advantages of lower requirement on a machine, simple process, simple steps, mechanized production in the production process, high mechanization degree, low material requirements, batch production, low production cost, and high economic benefits, a production process is green and pollution-free, the burden on the environment is reduced, and better environmental protection effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of polytetrafluoroethylene production, in particular to a modified formula for enhancing the toughness and service life of polytetrafluoroethylene. Background technique [0002] At present, the seal of the vehicle-mounted turbine bypass valve is mainly based on the double-lip structure, and the sealing performance and service life of the single-lip structure are not good. If the sealing surface is not sealed, the sealing performance will be reduced. At the same time, if the sealing performance is satisfied, it is difficult to pass the million-cycle life test required by the automotive test. [0003] The hardness of normal modified PTFE is higher than that of pure PTFE. It has high strength but poor toughness. For application scenarios such as turbocharger bypass valve sealing, not only the sealing performance but also the use must be considered Life, the normal modified PTFE formula, it is difficult to meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K3/22
CPCC08K3/22C08L27/18
Inventor 徐星星毛明江
Owner 上海佳珊赫新材料科技有限公司
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