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Ultrahigh-molecular-weight modified polytetrafluoroethylene dispersion resin

A technology of polytetrafluoroethylene and ultra-high molecular weight, which is applied in the field of ultra-high molecular weight modified polytetrafluoroethylene dispersion resin materials, can solve the problem of high price of modified monomers, and achieve the effect of low cost

Inactive Publication Date: 2012-02-01
上海宝澎化工科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japan's Daikyo Corporation also taught the preparation method of modified polytetrafluoroethylene dispersion resin in U.S. Patent No. 4840998 and 5176958, wherein the modified monomer used has the following structure: X-(CF2) nOCF=CF2 and C3F7 (OCF2CF2CF2)m (OCF(CF3)CF2)lOCF=CF2; But the modified monomers used are too expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a horizontal cylindrical type (length-to-diameter ratio 1.5:1) high-pressure reactor with a jacket that can pass through cold water / steam, the internal volume of the kettle is about 36 liters, and there are four blades. Add 21 kg of deionized water, 600 grams of paraffin (melting point about 56-58 degrees), 1 gram of succinic acid, 0.5 gram of oxalic acid, 25 ml of 20% perfluorooctanoic acid ammonia solution. Seal the reactor, increase the rotation speed to 65 rpm, and after the temperature in the reactor rises to 65 degrees, vacuumize and exhaust oxygen, pass tetrafluoroethylene monomer to raise the pressure of the reactor to normal pressure, then vacuum exhaust oxygen, and pass tetrafluoroethylene , and then evacuate oxygen until the oxygen content in the kettle is < 25ppm. Under a slight vacuum state, inhale 30 ml of perfluoro (propyl vinyl ether) modified monomer in the kettle, and then raise the temperature in the kettle to 80 degrees , the rotation speed is adj...

Embodiment 1

[0037] Ultra-high molecular weight modified polytetrafluoroethylene dispersion resin:

[0038] In a horizontal cylindrical type (length-to-diameter ratio 1.5:1) high-pressure reactor with a jacket that can pass through cold water / steam, the internal volume of the kettle is about 36 liters, and there are four blades. Add 21 kg of deionized water, 600 1 gram of paraffin (melting point 56-58 degrees), 1 gram of succinic acid, 0.5 gram of oxalic acid, and 25 milliliters of 20% perfluorooctanoic acid ammonia solution. Seal the reactor, increase the rotation speed to 65 rpm, and after the temperature in the reactor rises to 65 degrees, vacuumize and exhaust oxygen, pass tetrafluoroethylene monomer to raise the pressure of the reactor to normal pressure, then vacuum exhaust oxygen, and pass tetrafluoroethylene , then evacuate the oxygen until the oxygen content in the still < 25ppm, under the micro-vacuum state, inhale 5 grams of 3,3,4,4,4-pentafluorobutene in the still, which is a m...

Embodiment 2

[0041] Ultra-high molecular weight modified polytetrafluoroethylene dispersion resin:

[0042] In a horizontal cylindrical type (length-to-diameter ratio 1.5:1) high-pressure reactor with a jacket that can pass through cold water / steam, the internal volume of the kettle is about 36 liters, and there are four blades. Add 21 kg of deionized water, 600 grams of paraffin (melting point 56-58 degrees), 1 gram of succinic acid, 0.5 gram of oxalic acid, 25 ml of 20% perfluorooctanoic acid ammonia solution. Seal the reactor, increase the rotation speed to 65 rpm, and after the temperature in the reactor rises to 65 degrees, vacuumize and exhaust oxygen, pass tetrafluoroethylene monomer to raise the pressure of the reactor to normal pressure, then vacuum exhaust oxygen, and pass tetrafluoroethylene , and then evacuate oxygen until the oxygen content in the still < 25ppm, under the micro-vacuum state, inhale 0.5 gram of 3,3,4,4,5,5,5-heptafluoropentene in the still, which is modified si...

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Abstract

The invention relates to ultrahigh-molecular-weight modified polytetrafluoroethylene dispersion resin. According to the invention, an ultrahigh-purity tetrafluoroethylene monomer and a special modifying monomer are copolymerized in a high-pressure reaction kettle to form a dispersion emulsion with primary particle size of 120-280 nm; the standard specific gravity (SSG) of the dried resin is 2.14-2.16; the modifying monomer for modifying polytetrafluoroethylene resin is a fluorine-containing hydrogen-containing monomer which has 2-10 carbon atoms and an unsaturated bond to carry out free radical copolymerization; and the use amount of the modifying monomer is 0.001-0.1% of the total dry weight of the polytetrafluoroethylene dispersion resin. The modified ultrahigh-molecular-weight polytetrafluoroethylene dispersion resin provided by the invention has lower cost, can be processed into microporous expanded polytetrafluoroethylene through paste extrusion, calendering, and unidirectional or biaxial drawing, has higher physical mechanical strength such as tensile stress and the like, can be made into high-strength microporous thin film for clothes and filtration, and also can be made into fibers, sealing rings, gaskets, pipes and the like.

Description

technical field [0001] The invention relates to an ultrahigh molecular weight modified polytetrafluoroethylene dispersion resin material. Background technique [0002] Fluorine-containing resins, especially polytetrafluoroethylene resins, were first invented by DuPont of the United States during World War II. Due to its excellent physical and mechanical properties and chemical stability, it has been widely used in various fields such as chemical engineering, mechanical electronics, aerospace military industry, new materials and new energy. 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 It has become a high-end fluorine-containing functional material, such as filter membranes, clothing membranes, artificial organs, wire insulation materials and sealing materials. [...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F4/40C08F2/26C08J5/18
Inventor 吴慧生杨颖
Owner 上海宝澎化工科技有限公司