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Production method of modified polytetrafluoroethylene dispersion resin suitable for processing capillary tubes

A technology of polytetrafluoroethylene and dispersed resin, which is applied in the field of polymer resin, can solve the problems of not meeting the production capillary performance requirements, low melt flow, etc., and achieve high DC breakdown voltage strength, stable performance, and high compression ratio Effect

Active Publication Date: 2012-02-08
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventional polytetrafluoroethylene dispersion resin is a linear, high-crystallinity dispersion resin with high thermal stability, but has extremely low melt flow, and is restricted by existing equipment during the processing of pasty extruded products. , can not meet the performance requirements of the production of capillary, mainly suitable for the production of raw materials, elastic belts, rods, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The 2000L stainless steel autoclave that is equipped with stirring and temperature control system (circulation heating and circulation cooling water) is cleaned, adds 1400L deionized water, paraffin 60kg, succinic acid 1300g, 30% by weight perfluorooctanoic acid ammonium solution 6000ml and fluorine Carbocyclic ether 100g, start stirring, vacuumize, and control the oxygen content in the usual way of filling nitrogen until the oxygen content is less than 30ppm. Temperature is 70 ℃, feeds 2000 grams of composite modified monomer hexafluoropropylene and 750 grams of perfluoropropyl vinyl ether into the reaction kettle, and continuously feeds tetrafluoroethylene monomer (which contains 30 ppm of difluoromethane, trifluoroethylene 50ppm), and keep the internal pressure of the reactor at 2.8Mpa, add initiator ammonium persulfate 10g at the same time, start the reaction, during the reaction, control the maximum temperature in the polymerization tank to be 100°C, and stop feedin...

Embodiment 2

[0022] The 2000L stainless steel autoclave that is equipped with stirring and temperature control system (circulation heating and circulation cooling water) is cleaned, adds 1300L deionized water, paraffin 60kg, succinic acid 900g, 30% (percentage by weight) perfluorooctanoic acid ammonium solution 6000ml and Fluorocarbon cyclic ether 100g, start stirring, vacuumize, control the oxygen content in the usual way of filling nitrogen until the oxygen content is less than 30ppm, and then vacuumize, fill tetrafluoroethylene until the gauge pressure of the kettle is a slight positive pressure, adjust the temperature control The system controls the internal temperature of the polymerization tank to be 70°C, feeds 1,500 grams of composite modified monomer hexafluoropropylene and 300 grams of perfluoropropyl vinyl ether into the reactor, and continuously feeds tetrafluoroethylene monomer (which contains difluoromethane 40ppm, trifluoroethylene 50ppm) and keep the internal pressure of the...

Embodiment 3

[0024] The 2000L stainless steel autoclave that is equipped with stirring and temperature control system (circulation heating and circulation cooling water) is cleaned, adds 1400 deionized water, paraffin 60kg, succinic acid 1500g, 30% (percentage by weight) perfluorooctanoic acid ammonium solution 6000ml and Fluorocarbon cyclic ether 100g, start stirring, vacuumize, and control the oxygen content by filling nitrogen until the oxygen content is below 30ppm. After vacuuming, fill tetrafluoroethylene until the gauge pressure of the kettle is a slight positive pressure to control polymerization. The temperature in the still is 70°C, and 4000 grams of composite modified monomer hexafluoropropylene and 1000 grams of perfluoropropyl vinyl ether are passed into the reactor, and tetrafluoroethylene monomer (wherein difluoromethane 10ppm, trifluoromethane Ethylene 30ppm) and keep the internal pressure of the reactor at 2.8Mpa, add initiator ammonium persulfate 13g at the same time, star...

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PUM

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Abstract

The invention relates to a production method of modified polytetrafluoroethylene dispersion resin suitable for processing capillary tubes, which belongs to the technical field of high polymer resin. In the technical scheme, a compound fluoride surfactant system, an emulsion stabilizer, a pH value regulator, a molecular weight regulator and a peroxide initiator are added into a water phase, and then are stirred to form an oil in water type fine dispersoid, then a tetrafluoroethylene monomer and a compound modified monomer thereof are introduced and copolymerized, an emulsion is obtained after polymerization is completed, and the emulsion is post-processed to obtain the modified polytetrafluoroethylene dispersion resin. The method disclosed by the invention has the characteristics of simpleprocess, low cost and stable performance; the dispersion resin produced through changing the polymerization conditions of the resin has the characteristics of high compression ratio, low shrinkage, high direct current breakdown voltage strength, good adaptability and the like, is suitable for the needs of various processing factories, and can be used for processing the capillary tubes; and the capillary tubes have the characteristics of smoothness, softness, transparence and the like.

Description

technical field [0001] The invention relates to a production method of a modified polytetrafluoroethylene dispersion resin suitable for processing capillaries, and belongs to the technical field of polymer resins. Background technique [0002] Conventional polytetrafluoroethylene dispersion resin is a linear, high-crystallinity dispersion resin with high thermal stability, but has extremely low melt flow, and is restricted by existing equipment during the processing of pasty extruded products. , cannot meet the performance requirements of capillary production, and is mainly suitable for the production of raw material belts, elastic belts, rods, etc. In order to improve its comprehensive performance, it is committed to the modification research of PTFE, especially the copolymerization modification. By adding a small amount of modified monomers, the application performance of the resin can be improved. Contents of the invention [0003] The object of the present invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/26C08F214/28C08F216/14C08F4/30
Inventor 韩淑丽齐向东
Owner SHANDONG DONGYUE POLYMER MATERIAL
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