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Polytetrafluoroethylene microporous film and production method thereof

A polytetrafluoroethylene, manufacturing method technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve the problem that polytetrafluoroethylene microporous membrane has large pore size, water resistance and moisture permeability cannot meet the requirements , water pressure resistance or filtration effect can not meet the application requirements and other problems, to achieve the effect of high nanofiber content, improved air permeability, good water washability

Active Publication Date: 2014-06-25
烟台海德新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The PTFE microporous membrane currently manufactured has a large pore size, and its water pressure resistance or filtering effect cannot meet the application requirements; when it is applied to the clothing industry, the water resistance and moisture permeability cannot meet the requirements.

Method used

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  • Polytetrafluoroethylene microporous film and production method thereof
  • Polytetrafluoroethylene microporous film and production method thereof
  • Polytetrafluoroethylene microporous film and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 (production of polytetrafluoroethylene dispersion resin with core-shell structure)

[0031] In a horizontal autoclave of about 100 liters, first add 50 L of deionized water and 15 g of perfluorooctanoic acid ammonium, vacuumize the oxygen in the autoclave until the oxygen content is 2 . Add 1g of ammonium persulfate (dissolved in 500mL of water in advance) into the kettle as an initiator to start the copolymerization reaction. The temperature in the kettle is maintained at 70~110℃, and the pressure decreases with the reaction, and drops to less than 5kg / cm after about 1 hour 2 . At this time, the core part of the polytetrafluoroethylene dispersed resin primary particle (tetrafluoroethylene copolymer) is polymerized, the solid content of the emulsion is about 6%, and the average particle diameter of the primary particle is about 80nm.

[0032] Then vacuumize the inside of the kettle, and then feed tetrafluoroethylene monomer with a molar concentration>99.999%,...

Embodiment 2

[0033] Example 2 (production of polytetrafluoroethylene dispersion resin with core-shell structure)

[0034] In a horizontal autoclave of about 100 liters, first add 50 L of deionized water and 18 g of perfluorooctanoic acid ammonium, vacuumize the oxygen in the autoclave until the oxygen content is 2 . Add 0.2g of ammonium persulfate (dissolved in 500mL of water in advance) into the kettle as an initiator to start the copolymerization reaction. The temperature in the kettle is maintained at 70~110℃, and the pressure decreases with the reaction, and drops to less than 5kg / cm after about 1 hour 2At this time, the core part of the polytetrafluoroethylene dispersed resin primary particles (tetrafluoroethylene copolymer) is polymerized, the solid content of the emulsion is about 3%, and the average particle size of the primary particles is about 100nm.

[0035] Then vacuumize the inside of the kettle, and then feed tetrafluoroethylene monomer with a molar concentration>99.999%, an...

Embodiment 3

[0036] Embodiment 3 (manufacture of polytetrafluoroethylene microporous membrane)

[0037] Mix the polytetrafluoroethylene dispersion resin with a core-shell structure obtained in Example 1 with the American Exxon Mobil advanced lubricant (brand Isopar M) in a weight ratio of about 5:1, and pre-press it into a cylindrical shape after stirring evenly Then extrude the paste under high pressure at about 50°C, and calender it into strips with a thickness of about 0.1mm. The strip was stretched about 3 times transversely and deoiled in an oven at about 260° C. to obtain a dry film. The dry film is stretched about 10 times longitudinally at a high temperature of about 340°C, then stretched about 10 times transversely at a high temperature of about 360°C, and finally shaped at a high temperature of about 390°C to obtain polytetrafluoroethylene. Vinyl microporous membrane.

[0038] After testing, the average pore diameter of the obtained polytetrafluoroethylene microporous membrane ...

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Abstract

The invention discloses a production method of a polytetrafluoroethylene microporous film. The production method comprises the following steps of 1) mixing polytetrafluoroethylene dispersion resin with a core-shell structure with lubricating oil, evenly stirring and then pressing the mixture into cylindrical paste mixture; 2) squeezing and extruding the paste mixture at 20-120DEG C through an extruder, rolling the paste into bands and then removing the lubricating oil in the bands at 100-300DEG C or by using volatile organic solvent; and 3) unidirectionally or bidirectionally drawing the de-oiled bands at 100-390DEG C and finally conducting heat setting. The invention additionally discloses the polytetrafluoroethylene microporous film which is produced by adopting the production method of the polytetrafluoroethylene microporous film, wherein the content of nano-fibers in the polytetrafluoroethylene microporous film is high and the physical and mechanical strength is high. When the polytetrafluoroethylene microporous film is used in the clothing industry, after the polytetrafluoroethylene microporous film is compounded with clothing fabrics, the obtained compound fabrics have advantages that the water pressure resistance, the moisture permeability and the air permeability are improved, the water washing resistance is excellent and the compound fabrics can be accepted by the market.

Description

technical field [0001] The invention relates to a fluorine-containing resin, in particular to a polytetrafluoroethylene microporous membrane and a manufacturing method thereof. Background technique [0002] Fluorine-containing resins, especially polytetrafluoroethylene resins, have excellent physical and mechanical properties and chemical stability, and are widely used in various fields such as chemical materials, mechanical electronics, aerospace military industry, new materials and new energy. The polytetrafluoroethylene dispersed resin is extruded and deoiled by paste extrusion, and then stretched in one or two directions to obtain a microporous polytetrafluoroethylene material with micropores. Due to its special properties, the material becomes A fluorine-containing functional material for high-end applications, such as environmental filter materials, clothing fabrics, artificial organ materials, electronic materials, and sealing and insulating materials. [0003] PTFE ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D67/00
Inventor 吴慧道许达士
Owner 烟台海德新材料有限公司
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