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Hydrophilic biaxially-oriented polytetrafluoroethylene microporous membrane

A technology of polytetrafluoroethylene and microporous membranes, which is applied in membrane technology, semipermeable membrane separation, chemical instruments and methods, etc. It can solve problems such as poor modification effect, overall hydrophilicity of the membrane needs to be improved, and expensive equipment , to achieve the effect of short cooling time, low processing cost and good effect

Active Publication Date: 2015-07-22
ZHEJIANG LUCKING ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have technical problems such as expensive equipment and poor modification effect.
[0003] For example, CN102872732A (2013-1-16) discloses a method for hydrophilic modification of polytetrafluoroethylene microporous membranes, using fluorine-containing polyether polyol solution to infiltrate polytetrafluoroethylene microporous membranes, and then under certain conditions A hydrophilic cross-linked network polyurethane polymer is produced by polymerizing polyisocyanate in polytetrafluoroethylene microporous membrane, and a hydrophilic polytetrafluoroethylene microporous membrane is obtained. However, the overall hydrophilicity of the film needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Mixing: mix polytetrafluoroethylene resin powder, liquid paraffin, and sodium carbonate powder evenly in a weight ratio of 1:0.2:0.01, and let stand at 40°C for 16 hours to make the resin powder and liquid lubricate The agent is fully mixed to form a polytetrafluoroethylene material;

[0025] 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 ℃;

[0026] 3. Longitudinal stretching: stretch the polytetrafluoroethylene base tape longitudinally in an oven at 180°C to obtain a degreased base tape;

[0027] 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.

[0028] The hydrophilic polytetrafluoroethylene microporous fi...

Embodiment 2

[0030] 1. Mixing: Mix polytetrafluoroethylene resin powder, petroleum ether, and sodium carbonate powder evenly in a weight ratio of 1:0.28:0.2, and stand at 80°C for 10 hours to make the resin powder and liquid lubricate The agent is fully mixed to form a polytetrafluoroethylene material;

[0031] 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 ℃;

[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] The polytetrafluoroethylene microporous film material...

Embodiment 3

[0036] 1. Mixing: mix polytetrafluoroethylene resin powder, kerosene, and sodium carbonate powder evenly in a weight ratio of 1:0.25:0.1, and let stand at 60°C for 12 hours to make the resin powder and liquid lubricant Mix well to form polytetrafluoroethylene material;

[0037] 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 ℃;

[0038] 3. Longitudinal stretching: stretch the polytetrafluoroethylene base tape longitudinally in an oven at 220°C to obtain a degreased base tape;

[0039] 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;

[0040] The polytetrafluoroethylene microporous film material prepared by the above m...

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Abstract

The invention relates to the technical field of membranes and particularly provides a hydrophilic biaxially-oriented polytetrafluoroethylene microporous membrane. The water flux of the film is 1200-3000 kg / h.sq.m (1 kilogram force of pressure / sq.cm). A processing method of the hydrophilic biaxially-oriented polytetrafluoroethylene microporous membrane comprises the following steps: mixing materials: uniformly mixing polytetrafluoroethylene resin powder, liquid lubricating oil and inorganic salt powder according to the weight ratio of 1:(0.2-0.28):(0.01-0.2) and leaving to stand at the temperature of 40-80 DEG C for 10-16 hours to form a polytetrafluoroethylene material, wherein the degree of crystallinity of the polytetrafluoroethylene resin powder tested by virtue of differential scanning calorimetry is 98-99.9% and the number-average molecular weight is 2000-10000 thousands; compacting and calendering; longitudinally drawing; transversely drawing and carrying out heat setting. The polytetrafluoroethylene microporous membrane provided by the invention can be formed in one time, and the membrane is endowed with integral hydrophilic performance through the processing method.

Description

technical field [0001] The invention relates to the technical field of films, and specifically provides a hydrophilic biaxially stretched polytetrafluoroethylene microporous film. Background technique [0002] The PTFE microporous film formed by biaxial stretching can form a "fibril-node" microstructure, which is composed of a large number of micropores. In addition, the PTFE material itself has acid and alkali resistance, corrosion resistance, and high temperature resistance. And other characteristics, so it is widely used in the field of air and water filtration and purification. However, in the field of water filtration, hydrophilic membranes are required, and polytetrafluoroethylene itself has strong hydrophobicity, so hydrophilic modification is required. At present, there have been a large number of reports on the methods of hydrophilic modification of the surface of PTFE materials. The main methods are chemical grafting hydrophilic group method, high-energy radiatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/02B01D67/00
Inventor 周宏成
Owner ZHEJIANG LUCKING ENVIRONMENTAL PROTECTION CO LTD
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