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Nano-level polytetrafluoroethylene microporous membrane and preparation method thereof

A technology of polytetrafluoroethylene and microporous membranes, which is applied in the field of preparation of nanoscale polytetrafluoroethylene microporous membranes, can solve the problems of not being able to meet water pressure resistance and high application requirements, and achieve high physical and mechanical strength and good filtering effect , the effect of high nanofiber content

Inactive Publication Date: 2013-07-10
上腾新材料科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore diameter of the microporous membrane obtained by this method is greater than 100 nanometers, mostly between 200 and 500 nanometers, which also cannot meet the application requirements of higher water pressure resistance or better filtration effect
[0006] The U.S. Patent No. US 5814405 discloses another preparation method of polytetrafluoroethylene microporous membrane: blending polytetrafluoroethylene dispersion resin with kerosene Finally, paste extruded, deoiled, then stretched longitudinally below the melting point of PTFE, then sintered and shaped above the melting point of PTFE, and then stretched transversely below the melting point of PTFE , obtained microporous and multifibrous polytetrafluoroethylene microporous membranes. The pore diameter of the microporous membranes obtained by this method is greater than 200 nanometers, mostly around 1000 nanometers, and it cannot meet the application of higher water pressure resistance or better filtering effect. Require

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Make the number average molecular weight greater than or equal to 5 x 10 6 , The standard specific gravity is about 2.155 g / cm 3 PTFE dispersion resin and American Exxon Mobile high-grade lubricant (brand Isopar K) with a boiling point of 180-200 ℃ are mixed at a weight ratio of 5:1. After gentle mixing, they are pre-pressed into a cylindrical body. The paste was extruded under high pressure at 50°C and rolled into a tape with a thickness of about 0.08 cm. The wet belt was stretched 3 times in the transverse direction and then deoiled in an oven at 220° C. to obtain a dry film. The dry film is stretched 10 times in the longitudinal direction at a high temperature of 340°C, and then stretched 10 times in the transverse direction at a high temperature of 360°C, and finally shaped at a high temperature of 390°C to obtain the nano-scale polymer of the present invention. Tetrafluoroethylene microporous membrane. After testing, the average pore diameter of the obtained...

Embodiment 2

[0020] Make the number average molecular weight greater than or equal to 5 x 10 6 , The standard specific gravity is about 2.155 g / cm 3 PTFE dispersion resin and American Exxon Mobile high-grade lubricant (brand Isopar K) with a boiling point of 180-200 ℃ are mixed at a weight ratio of 5:1. After gentle mixing, they are pre-pressed into a cylindrical body. The paste was extruded under high pressure at 50°C and rolled into a tape with a thickness of about 0.2cm. The wet belt was stretched 3.8 times in the transverse direction and then deoiled in an oven at 220° C. to obtain a dry film. The dry film was stretched 30 times in the longitudinal direction at a high temperature of 340°C, and then stretched 15 times in the transverse direction at a high temperature of 360°C, and finally shaped at a high temperature of 390°C to obtain the nano-scale polymer of the present invention. Tetrafluoroethylene microporous membrane. After testing, the average pore diameter of the obtaine...

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PUM

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Abstract

The invention discloses a preparation method of a nano-level polytetrafluoroethylene microporous membrane, which comprises the steps of: mixing polytetrafluoroethylene disperse resin with high molecular weight with lubricating oil with boiling point of 100-300 DEG C according to the weight ratio of (4-6):1, extruding a paste through a pushing press at a temperature of 20-120 DEG C, making the paste into a tape by adopting a calendar, transversely drawing for 0-8 times, then deoiling in an oven of 50-300 DEG C to form a dry film, longitudinally drawing the dry film for 2-200 times at a temperature of 335-390 DEG C, then transversely drawing for 5-50 times, and finally carrying out thermal setting to obtain the polytetrafluoroethylene microporous membrane with an average thickness of 1-300 micrometers, an average pore diameter of being less than or equal to 100 nanometers, a porosity of being more than or equal to 78 percent, a hydraulic pressure resistance of being more than or equal to 3 kilograms / square centimeter and a moisture permeability of being more than or equal to 10000g water / square meter / day. The nano-level polytetrafluoroethylene microporous membrane has the advantagesof high content of nanometer fibers, and higher physical mechanical strengths, such as tension stress, and the like, and can meet the application requirement for high hydraulic pressure resistance orbetter filtering effect.

Description

technical field [0001] The invention relates to a preparation method of a nano-scale polytetrafluoroethylene microporous membrane. Background technique [0002] Fluorine-containing resins, especially polytetrafluoroethylene resins, have been widely used in various fields such as chemical industry, mechanical electronics, aerospace military industry, new materials and new energy due to their excellent physical and mechanical properties and chemical stability. The polytetrafluoroethylene dispersed resin is extruded and extruded in paste form and deoiled, and then stretched in one or two directions to obtain a microporous polytetrafluoroethylene material with micropores. Due to its special properties, the material Become a high-end fluorine-containing functional material, such as filter membranes, clothing membranes, artificial organs, wire insulation materials and sealing materials, etc. [0003] Due to its excellent mechanical properties, waterproof and breathable properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36
Inventor 吴慧生顾建荣杨颖张燚
Owner 上腾新材料科技(苏州)有限公司
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