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Post-processing method of fusible polytetrafluoroethylene

A polytetrafluoroethylene and tetrafluoroethylene technology, which is applied in the field of preparation of fusible polytetrafluoroethylene granules, can solve the problems affecting mechanical properties and stability, deepening color, and purity of fusible polytetrafluoroethylene products. drop etc.

Active Publication Date: 2015-08-05
SHANGHAI 3F NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

HF will corrode the processing equipment, and bring metal corrosion products into the meltable PTFE products, which will reduce the purity and deepen the color of the meltable PTFE products; CO 2 Make the fusible PTFE products have defects such as bubbles and pores, which affect its mechanical properties and stability

Method used

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  • Post-processing method of fusible polytetrafluoroethylene

Examples

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preparation example Construction

[0031] In the preparation method of the fusible polytetrafluoroethylene granulation material of the present invention, firstly, the fusible polytetrafluoroethylene slurry with a certain solid content is added into a kettle filled with a specific solvent, and left to stand or stirred at a slow speed for a certain period of time Finally, heat up and keep warm under stirring, and at the same time, condense and recover the evaporated gaseous solvent through a heat exchanger, and finally add inorganic salt or alkali to the kettle to further heat up, and keep it for a period of time, then cool down, filter, wash, and dry The fusible polytetrafluoroethylene pellets were obtained.

[0032] After being processed by the method of the present invention, the obtained meltable polytetrafluoroethylene pellets have relatively large bulk density, uniform and controllable particle size, good thermal stability, and can be directly used for extrusion to obtain translucent and glossy pellets. adv...

Embodiment 1

[0048] 1. obtain fusible polytetrafluoroethylene slurry by the method of U.S. Patent 3,635,926 embodiment 1

[0049] Add 6 g of ammonium persulfate and 10 g of ammonium perfluorooctanoate to a 6.2 liter stainless steel reactor with stirring device. It was then evacuated and purged three times with tetrafluoroethylene, after which 3.44 liters of dedistilled water and 75 g of perfluoropropyl vinyl ether were sucked in. Start the stirring device and heat to 70°C, add tetrafluoroethylene monomer while stirring at 125 rpm and maintain the pressure at 250 psig. After 18 minutes the reaction was terminated by evacuation of unreacted monomer. Take out the fusible polytetrafluoroethylene slurry, its solid content is 15wt%.

[0050] 2. Post-processing

[0051] Take 1 kg of the meltable polytetrafluoroethylene slurry prepared above and put it into a 10-liter stainless steel reactor equipped with a heat exchanger, and add 5 liters of trifluorotrichloroethane and methanol at a ratio of ...

Embodiment 2

[0054] 1. obtain fusible polytetrafluoroethylene slurry by the method of U.S. Patent 3,635,926 embodiment 1

[0055] Add 6 g of ammonium persulfate and 10 g of ammonium perfluorooctanoate to a 6.2 liter stainless steel reactor with stirring device. It was then evacuated and purged three times with tetrafluoroethylene, after which 3.44 liters of dedistilled water and 75 g of perfluoropropyl vinyl ether were sucked in. Start the stirring device and heat to 70°C, add tetrafluoroethylene monomer while stirring at 125 rpm and maintain the pressure at 250 psig. After 18 minutes the reaction was terminated by evacuation of unreacted monomer. Take out the fusible polytetrafluoroethylene slurry, its solid content is 15wt%.

[0056] 2. Post-processing

[0057] Take 1 kg of the fusible polytetrafluoroethylene slurry prepared by the above method and put it into a 10 liter capacity coagulation bucket, and add 5 liters of deionized water therein. Turn on the agitation switch of the coag...

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Abstract

The invention provides a post-processing method of soluble polytetrafluoroethylene. The post-processing method comprises the following steps: (1), polymerizing perfluoro alkyl vinyl ether having a general formula of Rf-O-CF=CF2 and tetrafluoroethylene to form soluble polytetrafluoroethylene slurry, wherein Rf is perfluoro alkyl having 1-8 carbon atoms, and the monomer weight ratio of the perfluoro alkyl vinyl ether to the tetrafluoroethylene is 1:10 to 1:100; (2), dissolving the soluble polytetrafluoroethylene slurry in a solvent; and (3), adding inorganic salt or alkali, increasing the temperature to 70-250 DEG C, and keeping the temperature for 2-6 hours.

Description

technical field [0001] The invention relates to a preparation method of meltable polytetrafluoroethylene pellets. More specifically, the present invention relates to post-processing methods for fusible polytetrafluoroethylene. The fusible polytetrafluoroethylene pellets prepared by the method of the invention have low content of unstable terminal groups. Background technique [0002] Fusible polytetrafluoroethylene (PFA) is a copolymer of tetrafluoroethylene (TFE) and a small amount of perfluoroalkyl vinyl ether (PAVE). Polytetrafluoroethylene resin was first successfully developed by DuPont of the United States in 1973, and its trade name was Teflon PFA. The main manufacturers of PTFE resin in the world include DuPont, Daikin, Asahi Glass, 3M and Solvay. At present, there is no manufacturer in China. Shanghai Sanaifu Company has carried out ordinary grade PTFE resin research work. [0003] The prior art documents describe in detail the synthesis method of fusible polyte...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F216/14C08F8/00
Inventor 程井动郭玉玲沈潮吴君毅
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD
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