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Production method of high molecular weight polytetrafluoroethylene dispersion resin suitable for processing biaxial stretching film

A technology of polytetrafluoroethylene and high molecular weight, which is applied in the field of polymers and can solve problems such as unstable performance, complicated process, and low molecular weight

Active Publication Date: 2010-08-18
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 resins generally have low molecular weight and low strength, which cannot meet the performance requirements for the production of biaxially stretched films. They are mainly suitable for the production of raw material tapes, extruded pipes, rods, etc.; Tetrafluoroethylene processes biaxially stretched film, but it has disadvantages such as complex process, high cost, and unstable performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a 2000L polymerization kettle with a stirrer, add 1400L of deionized water, 60Kg of paraffin, 5200ml of 30% (weight percent) ammonium perfluorooctanoate solution, 1.2g of ammonium persulfate, 1200g of succinic acid, airtightly evacuate and replace with nitrogen, after analysis After the oxygen content is less than or equal to 10ppm, the temperature in the reactor is raised to 70°C, the TFE monomer is added until the pressure in the reactor is 2.5Mpa, and the reaction is carried out under constant stirring conditions and constant pressure. During the reaction process, due to TFE polymerization is For strong exothermic reaction, the heat needs to be taken away by circulating water, and the temperature in the kettle should be controlled to rise steadily. As the reaction progresses, the temperature in the kettle will continue to rise. When the temperature in the reactor reaches 100°C, the reaction will stop. The amount of TFE in the reaction is 420kg, the concentration of...

Embodiment 2

[0025] Add 1300L of deionized water, 60Kg of paraffin, 5000ml of 30% (percentage by weight) ammonium perfluorooctanoate solution, 1g of ammonium persulfate, 1000g of succinic acid in a 2000L polymerization kettle with agitator, airtightly evacuate and replace with nitrogen, and analyze the oxygen content After the 10ppm or less is qualified, raise the temperature in the reactor to 65°C, add TFE monomer until the pressure in the reactor is 3.0Mpa, and carry out the reaction under constant stirring conditions and constant pressure. During the reaction process, TFE polymerization is a strong release For thermal reaction, the heat needs to be taken away by circulating water, and the temperature in the kettle should be controlled to rise steadily. As the reaction progresses, the temperature in the kettle will continue to rise. When the temperature in the reactor reaches 95°C, the reaction will stop. The amount of TFE in the reaction is 420kg. After polymerization, the concentration ...

Embodiment 3

[0027] Add 1300L of deionized water in a 2000L polymerization kettle with agitator, 40Kg of paraffin, 5000ml of 30% (percentage by weight) ammonium perfluorooctanoate solution, 0.8g of ammonium persulfate, 650g of succinic acid, airtightly evacuate and replace with nitrogen, after analyzing oxygen After the content is less than or equal to 10ppm, the temperature in the reactor is raised to 85°C, and the TFE monomer is added until the pressure in the reactor is 2.5Mpa. The reaction is carried out under constant stirring conditions and constant pressure. During the reaction process, due to TFE polymerization is strong For exothermic reaction, the heat needs to be taken away by circulating water, and the temperature in the kettle should be controlled to rise steadily. As the reaction progresses, the temperature in the kettle will continue to rise. When the temperature in the reactor reaches 95°C, the reaction will stop. The amount of TFE in the reaction is 380kg , the concentratio...

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PUM

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Abstract

The invention belongs to the high polymer field, which provides a production method which is suitable for processing the high molecular weight fluon dispersed resin of the bilateral stretching film. The method adopts emulsion polymerization method to perform the free radical polymerization. The invention is characterized in that high purity tetrafluorethylene monomer is taken as raw material, deionized water is taken as polymerization medium, under the existence of stabilizing agent paraffin, surface active agent fluorine chlorine bromine iodine astatine, initiator peroxide and pH value moderator succinic acid, and under the conditions that the reaction pressure is 2.0 to 5.0 MPa and reaction temperature is at 60 to 107 DEG C, the polymerization is performed to obtain broken emulsion of which the diameter of a primary particle is 20 nanometers and the thickness is 20 to 30 percent; through blending, conglomeration and drying, and fluon resin with average particle diameter of 350 to 650 micron is obtained. The invention has the advantages that the polymerization process is secure and easy to be controlled, the emulsion is stable, the process is advanced, the cost is low, the product performance is good, and the molecular weight reaches 8*10<6> etc; the invention is suitable for processing the bilateral stretching film, also has the advantages that the pore diameter is even, andthe pore distribution is good, etc.

Description

technical field [0001] The invention belongs to the field of macromolecules, and relates to a production method of a polytetrafluoroethylene dispersed resin. The resin has high molecular weight and stable performance, and is especially suitable for processing biaxially stretched films. technical background [0002] Conventional polytetrafluoroethylene dispersion resins generally have low molecular weight and low strength, which cannot meet the performance requirements for the production of biaxially stretched films. They are mainly suitable for the production of raw material tapes, extruded pipes, rods, etc.; Tetrafluoroethylene is used to process biaxially stretched film, but it has disadvantages such as complex process, high cost, and unstable performance. Contents of the invention [0003] The purpose of the present invention is to research and invent a production method of polytetrafluoroethylene dispersion resin suitable for processing biaxially stretched films, based...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08F2/24C08F2/38B29C55/00B29D7/01
Inventor 韩淑丽刘夫杰胡庆喜
Owner SHANDONG DONGYUE POLYMER MATERIAL
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