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Preparation method and product of polytetrafluoroethylene (PTFE) film

A kind of polytetrafluoroethylene, film technology

Active Publication Date: 2010-12-22
ZHEJIANG KERTICE HI TECH FLUOR MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the film processed by the above process has poor bidirectional dimensional stability, and shrinkage still exists during storage and use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Mixing: Mix 100g polytetrafluoroethylene powder (F106 of Daikin Corporation of Japan) and 20g liquid paraffin evenly, and let stand at 40°C for 16 hours to fully mix the resin powder and liquid lubricant to form polytetrafluoroethylene Vinyl fluoride materials;

[0024] 2. Compaction and calendering: Press the polytetrafluoroethylene material on a compactor at 50°C to form a cylindrical blank, and extrude the blank into a rod at a temperature of 40°C through a pusher, and then pass through The calender is calendered into a PTFE base tape at 40°C:

[0025] 3. Longitudinal stretching: stretch the polytetrafluoroethylene base tape longitudinally in an oven at 180°C to obtain a degreased base tape;

[0026] 4. Transverse stretching and heat setting: stretch the degreased base tape transversely at 180°C, and then sinter and set it at 380°C for 20 seconds to obtain a heat set film;

[0027] 5. Spraying with cooling water: Spray the heat-set film with 10°C cooling water ...

Embodiment 2

[0030] 1. Mixing: Mix 100g polytetrafluoroethylene powder (CD123, Japan Asahi Glass Co., Ltd.) and 28g liquid paraffin evenly, and let stand at 80°C for 10 hours to fully mix the resin powder and liquid lubricant to form polytetrafluoroethylene Vinyl materials;

[0031] 2. Compaction and calendering: press the polytetrafluoroethylene material on a compactor at 50°C to form a cylindrical blank, and extrude the blank into a rod at a temperature of 60°C through a pusher, and then pass through The calender is calendered into a PTFE base tape at 60°C:

[0032] 3. Longitudinal stretching: stretch the polytetrafluoroethylene base tape longitudinally in a 300°C oven to obtain a degreased base tape;

[0033] 4. Transverse stretching and heat setting: the degreased base tape was stretched transversely at 210°C, and then sintered at 250°C for 80 seconds to obtain a heat-set film;

[0034] 5. Spraying with cooling water: Spray the heat-set film with cooling water at 20°C for 20 seconds ...

Embodiment 3

[0037] 1. Mixing: Mix 100g polytetrafluoroethylene powder (CD123, Japan Asahi Glass Co., Ltd.) and 25g liquid paraffin evenly, and let stand at 60°C for 12 hours to fully mix the resin powder and liquid lubricant to form polytetrafluoroethylene Vinyl materials;

[0038] 2. Compacting and calendering: Press the polytetrafluoroethylene material on a compacting machine at 40°C to form a cylindrical blank, and extrude the blank into a rod at a temperature of 50°C through a pusher, and then pass through The calender is calendered into a PTFE base tape at 50°C:

[0039] 3. Longitudinal stretching: stretch the polytetrafluoroethylene base tape longitudinally in an oven at 220°C to obtain a degreased base tape;

[0040] 4. Transverse stretching and heat setting: stretch the degreased base tape transversely at 200°C, and then sinter and set it at 280°C for 60 seconds to obtain a heat set film;

[0041] 5. Spraying with cooling water: Spray the heat-set film with cooling water at 15°C...

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Abstract

The invention discloses a preparation method and a product of a polytetrafluoroethylene (PTFE) film. The preparation method comprises the steps of: mixing PTFE resin powder with a liquid lubricant, extruding, calendering, longitudinally stretching, laterally stretching and heat setting, and rapidly spraying cooling water under certain pressure to obtain a bidirectional stretched PTFE microporous film with the micropore aperture of 0.2-10, the lateral shrinkage of smaller than 3%, and the longitudinal shrinkage of smaller than 5%. The PTFE film has stable lateral and longitudinal dimension, great improvement of film usability, simple process and low cost.

Description

technical field [0001] The invention relates to a preparation method of a polytetrafluoroethylene film material and a product thereof, in particular to a preparation method and a product of a polytetrafluoroethylene microporous film with improved biaxial stretching and high dimensional stability. Background technique [0002] Membrane technology has been greatly developed in the past 40 years. Polytetrafluoroethylene (PTFE) film was first developed by Gore Company of the United States. It is composed of billions of continuous fibrils intertwined with each other. bright and clean. In addition, PTFE's chemical inertness and thermal stability broaden its application fields, whether it is placed in a harsh chemical environment, exposed to high temperature conditions, or requires biocompatibility and low chemical extractable occasions, porous PTFE membranes It can be regarded as an ideal material and is widely used in ultra-clean filter materials such as chemical industry, elect...

Claims

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Application Information

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IPC IPC(8): B29C55/14B29C67/04B29K27/18B29L7/00
Inventor 徐志梁
Owner ZHEJIANG KERTICE HI TECH FLUOR MATERIAL
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