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Method for improving porosity rate of two-way stretching polytetrafluoroethylene micropore thin film

A polytetrafluoroethylene, microporous film technology, applied in the application, household appliances, other household appliances and other directions, can solve the problem of low porosity, etc., and achieve the effects of short cooling time, low processing cost and simple process

Inactive Publication Date: 2015-07-29
ZHEJIANG LUCKING ENVIRONMENTAL PROTECTION CO LTD
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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 low porosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Mixing: mix polytetrafluoroethylene resin powder and liquid paraffin evenly at a weight ratio of 1:0.2, and let stand at 40°C for 16 hours to fully mix the resin powder and liquid lubricant to form polytetrafluoroethylene Tetrafluoroethylene materials;

[0023] 2. Compaction and calendering: The polytetrafluoroethylene material is pressed into a cylindrical blank on a compactor at 30°C, and the blank is extruded into a rod at a temperature of 40°C through a pusher, and then passed through a calender at 40°C. Calendered into PTFE base tape at ℃;

[0024] 3. Longitudinal stretching and water vapor treatment: the polytetrafluoroethylene base tape was stretched longitudinally in an oven at 180°C, and then treated with water vapor for 30 seconds to obtain a degreased base tape;

[0025] 4. Transverse stretching and heat setting: The degreased base tape was stretched transversely at 180°C, and then sintered at 380°C for 20 seconds to obtain a heat set film.

[0026] The ...

Embodiment 2

[0028] 1. Mixing: mix polytetrafluoroethylene resin powder and petroleum ether evenly at a weight ratio of 1:0.28, and let stand at 80°C for 10 hours to fully mix the resin powder and liquid lubricant to form polytetrafluoroethylene Tetrafluoroethylene materials;

[0029] 2. Compaction and calendering: The polytetrafluoroethylene material is pressed into a cylindrical blank on a compacting machine at 50°C, and the blank is extruded into a rod at a temperature of 60°C through a pusher, and then passed through a calender at 60°C. Calendered into PTFE base tape at ℃;

[0030] 3. Longitudinal stretching and water vapor treatment: stretch the polytetrafluoroethylene base tape longitudinally in an oven at 300°C, and then treat it with water vapor for 5 minutes to obtain a degreased base tape;

[0031] 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;

[0032] ...

Embodiment 3

[0034] 1. Mixing: Mix polytetrafluoroethylene resin powder and kerosene evenly in a weight ratio of 1:0.25, and let stand at 60°C for 12 hours to fully mix the resin powder and liquid lubricant to form polytetrafluoroethylene Vinyl fluoride materials;

[0035] 2. Compaction and calendering: The polytetrafluoroethylene material is pressed into a cylindrical blank on a compactor at 40°C, and the blank is extruded into a rod at a temperature of 50°C through a pusher, and then passed through a calender at 50°C Calendered into PTFE base tape at ℃;

[0036] 3. Longitudinal stretching and water vapor treatment: stretch the polytetrafluoroethylene base tape longitudinally in an oven at 220°C, and then treat it with water vapor for 1 minute to obtain a degreased base tape;

[0037] 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;

[0038] The polytetrafluoroe...

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PUM

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Abstract

The invention relates to the technical field of thin films, and particularly provides a method for improving the porosity rate of a two-way stretching polytetrafluoroethylene micropore thin film. The method comprises the following steps: (1) mixing materials: uniformly mixing polytetrafluoroethylene resin powder and liquid lubricating oil according to the weight ratio of 1:(0.2-0.28), performing still standing for 10-16 h at the temperature of 40-80 DEG C, so as to form a polytetrafluoroethylene material; (2) compaction and calendering: compacting the polytetrafluoroethylene material into cylindrical blank at the temperature of 30-50 DEG C, squeezing the blank into rod-like material through a compactor at the temperature of 40-60 DEG C, and then calendering into a polytetrafluoroethylene baseband through a calender at the temperature of 40-60 DEG C; (3) longitudinal stretching and water vapor treatment: conducting longitudinal stretching on the polytetrafluoroethylene baseband at 180-300 DEG C, and then conducting water vapor treatment for 0.5-5 min, so as to obtain a defatted baseband; (4) transversal stretching and heat shaping: conducting transversal stretching on the defatted baseband at 180-210 DEG C, then conducting sintering shaping at 250-380 DEG C with the sintering time of 20-80 s, so as to obtain the heat-shaped thin film. According to the method, the porosity rate can reach up to 86-92%, the process is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of films, and specifically provides a method for increasing the porosity of biaxially stretched polytetrafluoroethylene microporous films. Background technique [0002] The PTFE microporous film formed by biaxial stretching is a high-tech product integrating waterproof, moisture-permeable, and large air-permeable functions. The film is widely used in functional clothing, dust removal and other fields. For the film used in the field of dust removal, in order to ensure a large air flux, the porosity should be as high as possible. In published patents such as ZL200510061828.9 and ZL200710069975.X, the process of mixing polytetrafluoroethylene resin powder and lubricating oil, compacting, calendering, longitudinal stretching, transverse stretching and heat setting is generally completed. Practice has proved that the film processed through the above process has low porosity. Contents of the invention [0003]...

Claims

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Application Information

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IPC IPC(8): B29D7/01C08L27/18C08K3/26
Inventor 周宏成
Owner ZHEJIANG LUCKING ENVIRONMENTAL PROTECTION CO LTD
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