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Method for preparing polytetrafluoroethylene dispersion resin with high compression ratio

A technology of polytetrafluoroethylene and dispersed resin, which is applied in the field of polymers, can solve the problems of inability to obtain mechanical and electrical properties, low melt flow, and low compression ratio, and achieve high DC breakdown voltage strength, stable performance, and compression Higher effect

Inactive Publication Date: 2013-04-03
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventional homopolytetrafluoroethylene dispersion resin is a linear, high-crystallinity dispersion resin with the highest thermal stability, but has extremely low melt flow and low compression ratio, and is generally used for processing raw material belts and elastic belts , large-diameter tubes and other products, when used as paste extruded small-diameter tubes, capillary tubes and wires and cables, the products will crack, and products with excellent mechanical and electrical properties cannot be obtained.

Method used

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  • Method for preparing polytetrafluoroethylene dispersion resin with high compression ratio
  • Method for preparing polytetrafluoroethylene dispersion resin with high compression ratio

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Wash the 2000L stainless steel autoclave equipped with stirring and temperature control system (circulating heating and circulating cooling water), add 1400L deionized water, 60kg of solid paraffin, 420g of succinic acid, 6000ml of 30% (weight percent) ammonium perfluorooctanoate solution , start stirring at 20 rpm and vacuumize, replace with nitrogen three times until the oxygen content is below 30ppm, then vacuumize to -0.098Mpa, fill tetrafluoroethylene until the gauge pressure of the kettle is a slight positive pressure, adjust the temperature control system Control the internal temperature of the polymerization kettle to 70°C, increase the rotation speed to 45 rpm, continue to feed tetrafluoroethylene monomer into the reactor, and keep the internal pressure of the reactor at 1.5Mpa. At the same time, add 8g of initiator ammonium persulfate to start the reaction , After reacting for 0.5 hours, add modifier trifluoroethylene 1000g, continue feeding tetrafluoroethylene...

Embodiment 2

[0025] Wash the 2000L stainless steel autoclave equipped with stirring and temperature control system (circulating heating and circulating cooling water), add 1300L deionized water, 60kg of solid paraffin, 450g of succinic acid, 6000ml of 30% (weight percent) ammonium perfluorooctanoate solution , start stirring at 20 rpm and vacuumize, replace with nitrogen three times until the oxygen content is below 30ppm, then vacuumize to -0.098Mpa, fill tetrafluoroethylene until the gauge pressure of the kettle is a slight positive pressure, adjust the temperature control system Control the internal temperature of the polymerization kettle to 70°C, increase the rotation speed to 45 rpm, continue to feed tetrafluoroethylene monomer into the reactor, and keep the internal pressure of the reactor at 1.5Mpa. At the same time, add 8g of initiator ammonium persulfate to start the reaction , After reacting for 1.0 hour, add modifier hexafluoropropylene 1000g, trifluorochloroethylene 1500g, trif...

Embodiment 3

[0028] Wash the 2000L stainless steel autoclave equipped with stirring and temperature control system (circulating heating and circulating cooling water), add 1400L deionized water, 60kg of solid paraffin, 650g of succinic acid, 6000ml of 30% (weight percent) ammonium perfluorooctanoate solution , start stirring at 20 rpm and vacuumize, replace with nitrogen three times until the oxygen content is below 30ppm, then vacuumize to -0.098Mpa, fill tetrafluoroethylene until the gauge pressure of the kettle is a slight positive pressure, adjust the temperature control system Control the internal temperature of the polymerization kettle to 75°C, increase the speed to 45 rpm, continue to feed tetrafluoroethylene monomer into the reactor, and keep the internal pressure of the reactor at 1.4Mpa, and add 8g of initiator ammonium persulfate at the same time to start the reaction , After reacting for 0.5 hour, add modifier hexafluoropropylene 1500g, trifluorochloroethylene 1000g, trifluoroe...

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Abstract

The invention provides polytetrafluoroethylene dispersion resin with high compression ratio and a preparation method thereof, and belongs to the technical field of high polymers. Polymerization is conducted by using an emulsion polymerization method to form a copolymer; on the premise that the process is simple, the cost is low, and the performance is stable, a fluorine-containing surfactant system, an emulsion stabilizer, a PH value regulator and a peroxide initiator are added in an aqueous phase and stirred to form an oil-in-water type fine dispersion; then tetrafluoroethylene monomers are introduced for polymerization, quantitative modified monomers are added until the polymerization reaches a certain extent, and then constant-voltage polymerization proceeds, so that the dispersion emulsion with primary particles of 200-300 nanometers and the concentration of 28-35% is obtained after the polymerization; and the emulsion is subjected to dosing, agglomeration and drying to obtain the polytetrafluoroethylene dispersion resin. The polytetrafluoroethylene dispersion resin has the characteristics that the dispersion resin can be controlled easily and safely in a polymerization process; the emulsion is stable; the product performance is good; the resin is suitable for high compression ratio processing; and the processed finished product is smooth, soft, transparent and the like.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and relates to a polytetrafluoroethylene dispersion resin and a preparation method thereof, in particular to a high compression ratio polytetrafluoroethylene dispersion resin and a preparation method thereof. Background technique [0002] Conventional homopolytetrafluoroethylene dispersion resin is a linear, high-crystallinity dispersion resin with the highest thermal stability, but has extremely low melt flow and low compression ratio, and is generally used for processing raw material belts and elastic belts , large-diameter tubes and other products, when they are used as paste extruded small-diameter tubes, capillary tubes and wires and cables, the products will crack, and products with excellent mechanical and electrical properties cannot be obtained. In view of this situation, the present invention combines the characteristics of the meltable resin, by adding a small amount of modified...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F2/38C08F4/38
Inventor 韩淑丽夏俊韩桂芳齐向东
Owner SHANDONG DONGYUE POLYMER MATERIAL
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