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Method for manufacturing expanded polytetrafluoroethylene plate

A polytetrafluoroethylene plate and polytetrafluoroethylene technology, which is applied in the field of sealing materials, can solve problems such as no corresponding literature reports, and achieve the effects of being beneficial to civilian promotion, low cost, and low stress relaxation rate enhancement.

Inactive Publication Date: 2010-05-19
四会市生料带厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no corresponding literature report on the pure expanded polytetrafluoroethylene board used for sealing.

Method used

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  • Method for manufacturing expanded polytetrafluoroethylene plate
  • Method for manufacturing expanded polytetrafluoroethylene plate
  • Method for manufacturing expanded polytetrafluoroethylene plate

Examples

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Effect test

Embodiment 1

[0046] The manufacture method of expanded polytetrafluoroethylene (ePTFE) plate, its manufacture step is as follows:

[0047] (1) Put the polytetrafluoroethylene dispersed resin in a freezer to refrigerate at a temperature of 15° C. for 24 hours, and then sieve through an 8-mesh sieving machine.

[0048] (2) Mix the sieved polytetrafluoroethylene dispersion resin with the propellant, and let it stand for 2 hours; then stir for 14 minutes, and the mixing temperature is not higher than 19°C; let it stand for 24 hours; the polytetrafluoroethylene dispersion The parts by weight of the resin and the propellant are as follows: the polytetrafluoroethylene dispersion resin is 75-80, and the propellant is 18-22; the propellant can be one of kerosene solvent oil, sherwood oil or paraffin oil or Mix more than one.

[0049] (3) Carry out aging treatment; the aging treatment is carried out in the aging box, the aging temperature is 50-60° C., and the aging time is about 20-36 hours. Pref...

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PUM

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Abstract

A method for manufacturing an expanded polytetrafluoroethylene (PTFE) plate comprises the following steps: sieving PTFE dispersion resins, adding a propellant and mixing the two materials, placing the mixed materials for 24h and then carrying out aging treatment, then carrying out pre-press shaping and extruding blanks, carrying out calendaring with two rollers, removing the propellant, carrying out composite shaping after biaxial tension and carrying out reshaping and trimming to finally manufacture the expanded PTFE plate. The expanded PTFE plate is a great breakthrough in the manufacturingprocess of molded plates and turning plates. The compression resilience, the tensile strength and the low stress relaxation rate of the expanded PTFE plate are obviously increased and the expanded PTFE plate obviously improves the performance defects of the fluoroplastics, thus meeting the demand of the use functions of the sealing elements and propelling the fluoroplastics to be one of the substitutes of the asbestos materials widely used at present in the sealing material field.

Description

technical field [0001] The invention relates to a sealing material, in particular to a manufacturing method of an expanded polytetrafluoroethylene plate manufactured by a bidirectional stretching method used as a gasket, a sealing member and a lubricating material in a corrosive medium. Background technique [0002] Polytetrafluoroethylene is a polymer compound containing fluorine atoms in the main chain of the molecule. Due to the high dissociation energy of the C-F bond in the molecule, as well as the high electronegativity and shielding effect of the fluorine atoms, it has excellent high and low temperature resistance and chemical resistance. Stability, and has good dielectric properties, non-adhesion, low friction, weather resistance, non-combustibility and lubricity, it is a new chemical material with excellent performance. [0003] Gaskets with polytetrafluoroethylene (PTFE) as the main material are currently produced in two categories in China, one is pure PTFE gasket...

Claims

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Application Information

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IPC IPC(8): B29C69/02B29C55/12B29C43/24B29C43/58B29B13/04B29B13/10B29B11/00
Inventor 曾燕飞
Owner 四会市生料带厂有限公司
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