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Preparation method of fusible polytetrafluoroethylene

The technology of polytetrafluoroethylene and tetrafluoroethylene is applied in the field of preparation of fusible polytetrafluoroethylene, which can solve the problem of decreased purity of fusible polytetrafluoroethylene products, lack of mechanical properties, surface finish, and uneven distribution of additives and other problems, to achieve the effect of small spherulite size, high surface finish and uniform distribution

Active Publication Date: 2016-10-05
SHANGHAI 3F NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned prior art is obtained by adding non-fusible polytetrafluoroethylene polymers as additives to fusible polytetrafluoroethylene polymers, and the additives of the prior art and the target product fusible polytetrafluoroethylene Copolymers are different in composition, and the products prepared by them have the problem of non-uniform composition, which may cause the purity of meltable PTFE products to decrease, as well as lack in mechanical properties and surface smoothness.
In addition, in the prior art, additives are usually added to the polymer system in the steps of coagulation, kneading, extrusion, etc. after the polymerization reaction is completed, and the final product is obtained by further melt mixing, and the product thus obtained will still exist The problem of uneven distribution of additives

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0012] The present invention provides a method for preparing fusible polytetrafluoroethylene, which uses perfluoroalkyl vinyl ether and tetrafluoroalkyl vinyl ether with the same composition as the target polymer (ie, fusible polytetrafluoroethylene) but with a larger molecular weight. The copolymer of vinyl fluoride is used as an additive to participate in the polymerization reaction of the target polymer. The preparation method of fusible polytetrafluoroethylene of the present invention comprises the steps:

[0013] (1) Make the general formula Rf-O-CF=CF 2 A perfluoroalkyl vinyl ether and tetrafluoroethylene are polymerized to provide an additive copolymer, wherein Rf is a perfluoroalkyl group having 1 to 5 carbon atoms; wherein the additive copolymer has a melt index of 0.1 -3g / 10min;

[0014] The general formula applicable to the method of the present invention is Rf-O-CF=CF 2 In the perfluoroalkyl vinyl ether, Rf is a linear or branched perfluoroalkyl group with 1-5 c...

Embodiment 1

[0070] (a) Preparation of Additive Copolymer 1

[0071] Evacuate and replace a 2L stainless steel reaction kettle with a magnetic stirring device so that the oxygen content is not higher than 20ppm. After adding 1.3L of trifluorotrichloroethane organic solvent mixed with 25g of perfluoropropyl vinyl ether into the kettle, Add tetrafluoroethylene polymerization reaction monomer until the pressure of the kettle is 0.3MPa. Heat the stainless steel reaction kettle to make the temperature inside the kettle reach 40°C, then add 10 mL of organic peroxide (C 3 f 7 OC 2 f 4 CO 2 ) 2 The trifluorotrichloroethane solution is used as the initiator solution to initiate the polymerization reaction. During the polymerization process, the tetrafluoroethylene monomer is continuously added to maintain the reaction pressure constant, and the reaction temperature is controlled not to exceed 50 ° C. The tetrafluoroethylene monomer Stop reaction after addition reaches 140g. Lower the tempe...

Embodiment 2

[0077] (a) Preparation of Additive Copolymer 1

[0078] Evacuate and replace a 2L stainless steel reaction kettle with a magnetic stirring device so that the oxygen content is not higher than 20ppm. After adding 1.3L of trifluorotrichloroethane organic solvent mixed with 25g of perfluoropropyl vinyl ether into the kettle, Add tetrafluoroethylene polymerization reaction monomer until the pressure of the kettle is 0.3MPa. Heat the stainless steel reaction kettle to make the temperature inside the kettle reach 40°C, then add 10 mL of organic peroxide (C 3 f 7 OC 2 f 4 CO 2 ) 2 The trifluorotrichloroethane solution is used as the initiator solution to initiate the polymerization reaction. During the polymerization process, the tetrafluoroethylene monomer is continuously added to maintain the reaction pressure constant, and the reaction temperature is controlled not to exceed 50 ° C. The tetrafluoroethylene monomer Stop reaction after addition reaches 140g. Lower the tempe...

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Abstract

The invention provides a preparation method of meltable polytetrafluoroethylene. The preparation method comprises steps as follows: (1), perfluoroalkyl vinyl ether with a general formula of Rf-O-CF=CF2 and tetrafluoroethylene have a polymerization reaction so as to provide an additive copolymer, wherein Rf represents a perfluoroalkyl group with 1-5 carbon atoms, the melt index of the additive copolymer is 0.1-0.3g / 10 min; (2), in the presence of the additive copolymer prepared in the step (1), perfluoroalkyl vinyl ether and tetrafluoroethylene which are the same as those used in the step (1) have the polymerization reaction to provide a target copolymer, and the melt index of the target copolymer is 10-50 g / 10 min.

Description

technical field [0001] The invention relates to a method for preparing fusible polytetrafluoroethylene. More specifically, the present invention relates to a method for controlling the spherulite size of a meltable polytetrafluoroethylene polymer, and the meltable polytetrafluoroethylene prepared by the method of the present invention has a smaller spherulite size, and a higher surface finish. Background technique [0002] At this stage, my country's fluorine chemical industry is facing unprecedented opportunities for development. The national government and various ministries and commissions have attached great importance to the fluorine chemical industry in a number of programmatic documents. The "Twelfth Five-Year National Strategic Emerging Industry Development Plan" lists fluorine material-related technologies as key development directions or main tasks in strategic emerging industries such as energy conservation and environmental protection, new energy, and new materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08F216/14C08F2/38
Inventor 郭玉玲程井动沈潮吴君毅
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD
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