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Modified PTFE (Polytetrafluoroethylene) suspension resin with high welding property and preparation method of modified PTFE suspension resin

A suspension resin and modification technology, applied in the field of high welding performance modified PTFE suspension resin and its preparation, can solve the problems of low resin uniformity, affecting mechanical properties, etc., to improve welding performance and electrical performance, and low porosity. , the effect of excellent welding performance

Active Publication Date: 2014-04-02
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this patent, the modifier is added intermittently, and the uniformity of the obtained resin is not high, which affects its mechanical properties.

Method used

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  • Modified PTFE (Polytetrafluoroethylene) suspension resin with high welding property and preparation method of modified PTFE suspension resin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a modified PTFE suspension resin with high welding performance.

[0029] Add 30L deionized water, 0.4g ammonium persulfate, 0.2g perfluoropolyether carboxylate, 2g sodium carbonate to the cleaned 50L autoclave, close the reactor, start stirring, and evacuate the reactor, when Oxygen content ≤ 20ppm is qualified. After passing the test, fill the reactor with TFE monomer to make the pressure in the reactor reach 0.5MPa, then raise the temperature of the reactor to 35°C, and add 0.024g of reducing agent and 12g of perfluoropropylene into the reactor. Vinyl ether (PPVE), filled with TFE monomer until the pressure in the kettle reaches 1.5MPa, and the reaction starts. During the reaction, the monomer was continuously replenished to maintain a constant pressure in the kettle, and 0.016g of reducing agent and 28g of PPVE were continuously added through a dedicated pipeline until the end of the reaction. When the feeding amount of TFE monomer reaches 4...

Embodiment 2

[0031] This embodiment provides a modified PTFE suspension resin with high welding performance.

[0032] Add 30L deionized water, 0.8g ammonium persulfate, 0.3g perfluoropolyether carboxylate, 4g sodium carbonate to the cleaned 50L autoclave, close the reactor, start stirring, and evacuate the reactor, when Oxygen content ≤ 20ppm is qualified. After passing the test, fill the reactor with TFE monomer to make the pressure in the reactor reach 0.5MPa, then raise the temperature of the reactor to 30°C, and add 0.042g of reducing agent and 15g of perfluoropropylene into the reactor. Vinyl ether (PPVE), filled with TFE monomer until the pressure in the kettle reaches 1.5MPa, and the reaction starts. During the reaction, the monomer was continuously replenished to maintain a constant pressure in the kettle, and 0.028g of reducing agent and 35g of PPVE were continuously added through a dedicated pipeline until the end of the reaction. When the feeding amount of TFE monomer reaches 5...

Embodiment 3

[0034] This embodiment provides a modified PTFE suspension resin with high welding performance.

[0035] Add 30L deionized water, 1.0g ammonium persulfate, 0.4g perfluoropolyether carboxylate, 6g sodium carbonate to the cleaned 50L autoclave, close the reactor, start stirring, and evacuate the reactor, when Oxygen content ≤ 20ppm is qualified. After passing the test, fill the reactor with TFE monomer to make the pressure in the reactor reach 0.5MPa, then raise the temperature of the reactor to 25°C, and add 0.06g of reducing agent and 18g of perfluoroform into the reactor. Vinyl ether (PMVE), filled with TFE monomer until the pressure in the kettle reaches 1.5MPa, and the reaction starts. During the reaction, the monomer was continuously replenished to maintain a constant pressure in the kettle, and 0.04 g of reducing agent and 42 g of PMVE were continuously added through a dedicated pipeline until the end of the reaction. When the feeding amount of TFE monomer reaches 5.5kg,...

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Abstract

The invention relates to a modified PTFE (Polytetrafluoroethylene) suspension resin which comprises the following components in parts by weight: 3500-6000 parts of tetrafluoroethylene, 0.2-1.5 parts of oxidizing agent, 0.1-0.5 part of dispersion agent, 1-8 parts of buffer salt, 0.02-0.15 parts of reducing agent, and 30-70 parts of perfluor propyl vinyl ether. By regulating the adding steps of polymerization monomers, the reaction process is effectively controlled, the obtained polymer is compact in structure and low in porosity, and the welding property and the electrical property of the polymer are improved.

Description

technical field [0001] The invention relates to a modified PTFE suspension resin with high welding performance and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Among many fluoroplastics, PTFE resin has good heat resistance, non-adhesiveness, weather resistance, chemical resistance, low friction coefficient and electrical properties, etc., and plays an important role in modern industry. However, the conventional polytetrafluoroethylene (PTFE) resin has disadvantages such as low hardness, poor creep resistance, large product voids, and non-weldability. [0003] Around the 1970s, companies such as DuPont and Allied developed a method for preparing modified PTFE resin by adding modified monomers during the polymerization process, and put it into production. The production of its modified PTFE resin is to add a small amount of modified monomers such as perfluoro-n-propyl vinyl ether (PPVE), perfluoromethyl vinyl ether (...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F216/14C08F4/40
Inventor 秦向明张建新胡显权姚权卫张春静苏小龙罗湘华周云峰
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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