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Modified teflon preparation method and obtained product thereof

The technology of polytetrafluoroethylene and tetrafluoroethylene is applied in the field of preparation of fluorine-containing polymers, which can solve the problems of relatively transparency and poor whiteness of extruded tubes, and achieve the effects of excellent performance, good whiteness and stable process.

Inactive Publication Date: 2015-01-28
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese Patent Publication No. CN1942493A discloses a preparation method of modified polytetrafluoroethylene powder, which is mainly used for pasty extrusion to make cable coating materials, etc. The extruded tube has problems such as poor whiteness and transparency

Method used

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  • Modified teflon preparation method and obtained product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Process A: In a 5L stainless steel autoclave equipped with a jacket and stirring, after cleaning the autoclave, add 2.8L deionized water, 84g solid paraffin (melting point: 56-58°C), 0.84g succinic acid, 80g Ammonium perfluorooctanoate dispersant, cover the lid of the kettle, start stirring, vacuumize, and replace with nitrogen. Until the oxygen content in the kettle is less than 30ppm, control the temperature in the kettle to 70°C, feed tetrafluoroethylene monomer, add 0.01g ammonium persulfate initiator, control the reaction pressure to 2.5MPa, start the reaction, and control the temperature in the kettle during the reaction. The highest temperature was 90°C. After 0.5 hours of reaction, the reaction was stopped to obtain a homopolymer emulsion with a solid content of 8%.

[0031] Process B: In the same reaction kettle as above, add 2.8 L of the homopolymer emulsion obtained in the process A, cover the kettle, vacuumize, and replace with nitrogen. Until the oxygen co...

Embodiment 2

[0034] Process A: the same as process A in Example 1, except that 2.4L of deionized water, 0.28g of succinic acid, and 0.0084g of ammonium persulfate were added in the reactor, and the solid content of the obtained homopolymer emulsion was 2%.

[0035] B process: with the B process in embodiment 1, difference is to add the homopolymer latex obtained in 2.4LA process, 2g hexafluoropropylene, 0.012g ammonium persulfate initiator, reaction times 3.5 hours, the dispersion liquid solid content that makes is 31 %.

[0036] The copolymerized dispersion is diluted, coagulated and dried after post-treatment (the drying temperature is controlled at 180° C.), and the water content in the resin is controlled below 0.03%. The modified polytetrafluoroethylene dispersion resin is obtained, which is used for paste extrusion processing capillary, and the obtained product has neatness, smoothness, good whiteness, and opacity.

Embodiment 3

[0038] A process: with the A process in Example 1, the difference is that the addition of ammonium perfluorooctanoate is 1.6g, the initiator ammonium persulfate is 0.014g, solid paraffin 28g, the reaction time is 0.4 hours, and the solid content of the gained homopolymer emulsion is 5%.

[0039] Process B: Same as process B in Example 1, except that 2 g of hexafluoropropylene was added, and the solid content of the resulting dispersion was 25%.

[0040] The copolymerized dispersion is diluted, coagulated and dried after post-treatment (the drying temperature is controlled at 180° C.), and the water content in the resin is controlled below 0.03%. The modified polytetrafluoroethylene dispersion resin is obtained, which is used for paste extrusion processing capillary, and the obtained product has the advantages of neatness, smoothness, good whiteness, and opacity.

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Abstract

The invention relates to a modified teflon preparation method. According to the modified teflon preparation method, a process A is a homopolymerisation process of teflon and comprises the steps that water is added to a closed reaction vessel, a fluorine-containing surfactant, a stabilizer, a PH modifier and an initiator are added to the water so that an aqueous phase can be formed, and the volume of the aqueous phase in the reaction vessel is 40% to 70% that of the reaction vessel; tetrafluoroethylene monomers are fed to the space above the aqueous phase so that a polymerization reaction can be performed, and teflon homopolymerisation emulsion is obtained. A process B is a copolymerization process of tetrafluoroethylene and comprises the steps that comonomers and an initiator are added to the homopolymerisation emulsion obtained in the process A, a copolymerization reaction is carried out till the reaction is finished, and teflon copolymerization emulsion is obtained. According to the modified teflon preparation method, the technological operation range is wide, the process is stable, produced dispersion resin can be used for producing non-transparent extrusion tube products which are good in performance, regular, smooth and good in whiteness, and the method can be applied to the application field of insulating materials.

Description

technical field [0001] The invention relates to the field of organic chemistry, in particular to a preparation method of a fluorine-containing polymer. Background technique [0002] PTFE has excellent chemical corrosion resistance, high and low temperature resistance, aging resistance, low friction, non-stickiness and physiological inertness, making it an indispensable special product in chemical, mechanical, electrical, construction, medical and other fields. Materials, instead of traditional materials in the past, the most important applications of high-end PTFE dispersion resin include processing thin-walled tubes, cable and wire coating, insulating sleeves, etc. [0003] Due to the straight-chain molecular structure and high crystallinity of conventional polytetrafluoroethylene dispersed resins, there are often problems such as too low compression ratio, high extrusion pressure, and high requirements for equipment in the paste extrusion process, which seriously restricts...

Claims

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Application Information

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IPC IPC(8): C08F259/08C08F214/26C08F214/28C08F214/24C08F216/14C08F114/26C08L27/18
Inventor 姚权卫张春静秦向明苏小龙
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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