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Method for preparing nano polytetrafluoroethylene microporous membrane

The technology of polytetrafluoroethylene and microporous membrane is applied in the field of preparation of nano-scale polytetrafluoroethylene microporous membrane, which can solve the problems of high filtration effect, inability to meet water pressure resistance, etc. high effect

Inactive Publication Date: 2011-08-17
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: after blending polytetrafluoroethylene dispersion resin with kerosene, extruding paste, deoiling, and then Longitudinal stretching is carried out below the melting point of PTFE, and then sintered and shaped above the melting point of PTFE, and then transversely stretched below the melting point of PTFE to obtain microporous and fibrous PTFE micropores Membrane, the pore diameter of the microporous membrane obtained by this method is greater than 200 nanometers, mostly around 1000 nanometers, and cannot meet the application requirements of higher water pressure resistance or better filtration effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Set number average molecular weight > 5 x 10 6 , the standard specific gravity is about 2.155 g / cm 3 The polytetrafluoroethylene dispersion resin and American Exxon Mobile high-grade lubricating oil (brand Isopar K) with a boiling point of 180-200 ℃ are mixed at a weight ratio of 5:1, and after gentle stirring, they are pre-pressed into a cylindrical body, and then The paste was extruded under high pressure at 50°C and calendered into a tape with a thickness of about 0.08 cm. The wet tape was stretched 3 times transversely and deoiled in an oven at 220° C. to obtain a dry film. Stretch the dry film 10 times longitudinally at a high temperature of 340°C, then stretch 10 times transversely at a high temperature of 360°C, and finally shape it at a high temperature of 390°C to obtain the nano-sized polytetrafluoroethylene of the present invention. Vinyl microporous membrane. After testing, the average pore diameter of the obtained nano-scale polytetrafluoroethylene...

Embodiment 2

[0022] The number average molecular weight > 5 x 10 6 , the standard specific gravity is about 2.155 g / cm 3 The PTFE dispersion resin and American ExxonMobile high-grade lubricating oil (brand IsoparK) with a boiling point of 180-200°C are mixed at a weight ratio of 5:1. Extrude the paste under high pressure, and calender it into a tape with a thickness of about 0.2cm. The wet tape was stretched 3.8 times transversely and deoiled in an oven at 220° C. to obtain a dry film. The dry film is stretched longitudinally by 30 times at a high temperature of 340°C, then stretched transversely by 15 times at a high temperature of 360°C, and finally shaped at a high temperature of 390°C to obtain the nano-sized polytetrafluoroethylene of the present invention. Vinyl microporous membrane. After testing, the average pore diameter of the obtained nano-scale polytetrafluoroethylene microporous membrane is 45-60nm, the porosity is 88%-92%, and the tensile strength (transverse and lon...

Embodiment 3

[0024] Set number average molecular weight > 5 x 10 6 , the standard specific gravity is about 2.155 g / cm 3 The polytetrafluoroethylene dispersion resin and American Exxon Mobile high-grade lubricating oil (brand Isopar K) with a boiling point of 180-200 ℃ are mixed at a weight ratio of 5:1, and after gentle stirring, they are pre-pressed into a cylindrical body, and then The paste was extruded under high pressure at 50°C and calendered into a tape with a thickness of about 0.07 cm. The wet tape was deoiled in an oven at 250°C to obtain a dry film. Stretch the dry film longitudinally by 2 times at a high temperature of 345°C, then stretch it transversely 15 times at a high temperature of 360°C, and finally shape it at a high temperature of 390°C to obtain the nano-sized polytetrafluoroethylene of the present invention. Vinyl microporous membrane. After testing, the average pore diameter of the obtained nano-scale polytetrafluoroethylene microporous membrane is 100-110 ...

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Abstract

The invention discloses a method for preparing a nano polytetrafluoroethylene microporous membrane, which comprises: mixing high-molecular-weight polytetrafluoroethylene dispersion resin and lubricating oil according to a weight ratio of (4-6):1, extruding a pasty material in an extruder at 20 to 120 DEG C, calendering the pasty material into a belt in a calender, and transversely stretching the belt by 0 to 8 times; removing oil in an oven at 50 to 300 DEG C to obtain a dry membrane, and stretching at 335 to 390 DEG C; and finally, performing thermosetting to obtain the polytetrafluoroethylene microporous membrane with an average thickness of 1 to 300 micrometers, an average aperture smaller than or equal to 180 nanometers, a porosity more than or equal to 78 percent, a water pressure resistance more than or equal to 3kg / cm<2>, and a moisture permeability more than or equal to 10,000 grams of water per square meter per day. The obtained microporous membrane has high nano fiber content and high mechanical strength such as tensile strength. The super-small nano micropores can meet the application requirements for higher water pressure resistance or better 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 Applications(China)
IPC IPC(8): B01D71/36
Inventor WU HUISHENGGU JIANRONGYANG YINGZHANG YI
Owner 上腾新材料科技(苏州)有限公司
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