Production method of tetrafluoroethylene polymer used for processing wide breadth oilless low-density raw material sealing belt

A technology with tetrafluoroethylene and tetrafluoroethylene, applied in the field of polymers, can solve the problems of uneven thickness, uneven rolling width, poor appearance, etc., and achieve the effect of good emulsion stability and stable resin performance

Active Publication Date: 2008-07-09
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The initiator is usually a persulfate, which generates initial active radical substances in the free radical chain polymerization and initiates the polymerization reaction. However, the dispersed resin produced by this method is used for domestic processing of raw materials, and has uneven thickness, patterns, and transparency. , unbalanced rolling width, poor appearance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In a 800L polymerization kettle with a stirrer, add 520L of deionized water, 36Kg of paraffin, 2500ml of 30% (percentage by weight) ammonium perfluorooctanoate solution, 4g of ammonium persulfate, 312g of succinic anhydride, airtightly evacuate and replace with nitrogen, after analyzing oxygen After the content is less than or equal to 30ppm, the temperature in the reactor is raised to 70°C, and TFE monomer (30ppm of difluoromethane and 5ppm of trifluoroethylene) is added until the pressure in the kettle is 2.0Mpa. Under constant stirring conditions, constant pressure The reaction is carried out under the following conditions. During the reaction process, since TFE polymerization is a strong exothermic reaction, the heat needs to be taken away by circulating water to control the temperature in the kettle to rise steadily. As the reaction progresses, the temperature in the kettle continues to rise. When the reaction kettle When the temperature reaches 100°C, the reaction ...

Embodiment 2

[0027] In a 2000L polymerization kettle with agitator, add 1300L of deionized water, 60Kg of paraffin, 5000ml of 30% (percentage by weight) ammonium perfluorooctanoate solution, 10g of ammonium persulfate, 1300g of succinic anhydride, airtightly evacuate and replace with nitrogen, and analyze the oxygen content After the 30ppm or less is qualified, raise the temperature in the reactor to 65°C, add TFE monomer (50ppm of difluoromethane and 10ppm of trifluoroethylene) until the pressure in the kettle is 2.0Mpa, under constant stirring conditions and constant pressure The reaction is carried out. During the reaction process, since TFE polymerization is a strong exothermic reaction, it is necessary to use circulating water to take away the heat and control the temperature in the kettle to rise steadily. As the reaction progresses, the temperature in the kettle continues to rise. When the temperature in the reactor Stop the reaction when it reaches 95°C, the reaction TFE amount is 5...

Embodiment 3

[0029] In a 2000L polymerization kettle with agitator, add 1300L of deionized water, 60Kg of paraffin, 5000ml of 30% (percentage by weight) ammonium perfluorooctanoate solution, 10g of ammonium persulfate, 1300g of succinic anhydride, airtightly evacuate and replace with nitrogen, and analyze the oxygen content After 30ppm or less is qualified, raise the temperature in the reactor to 65°C, add TFE monomer (difluoromethane in mass: 80ppm, trifluoroethylene: 17ppm) until the pressure in the kettle is 2.5Mpa, under constant stirring conditions, constant The reaction is carried out under pressure. During the reaction process, since TFE polymerization is a strong exothermic reaction, the heat needs to be taken away by circulating water to control the temperature in the kettle to rise steadily. As the reaction progresses, the temperature in the kettle continues to rise. When the reaction kettle Stop the reaction when the internal temperature reaches 95°C, the amount of TFE reacted is...

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PUM

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Abstract

The invention belongs to the field of high molecular, which provides a process for preparing tetrafluoroethylene polymer, and the invention adopts an emulsion polymerization method to polymerize. The invention is characterized in that the process comprises utilizing tetrafluoroethylene monomer be raw material, utilizing deionized water be medium, polymerizing under the condition that reaction pressure which is 0.8-3.0MPa, reaction temperature which is 60-110 DEG C and under the exisisting of stabilizing agent which is paraffin wax, surface activator which is perfluorooctanoic acid ammonium, initiating agent which is hyperoxide, and composite molecular weight conditioning agent, and getting suspension latex whose primary particles are about 20 nanometer, and density is between 16% and 33%, and at last getting polytetrafluoroethylene resin whose average particle size is 350-650um through batching, condensing and drying. The invention adopts a process of adding conditioning agent namely binary acid anhydride in polymerization, and the polymerization process is safe and easy to control, emulsion is stable, elongation percentage of resin products is high. The invention is suitable for preparing wide-coverage non-oil low-density seal tapes of raw material, which ha the advantages of white and soft, even thickness and thinness, balance calendering width and the like.

Description

technical field [0001] The invention belongs to the field of macromolecules and relates to a production method of a tetrafluoroethylene polymer, which is especially suitable for processing a wide-width oil-free low-density raw material sealing tape. technical background [0002] PTFE resin is known as the "king of plastics" because of its excellent properties such as heat resistance, weather resistance, chemical corrosion resistance, low friction, and good electrical insulation resistance. It has been widely used in the national economy field. [0003] At present, there are many patent reports on tetrafluoroethylene (TFE) polymers and preparation methods at home and abroad. TFE polymers include polytetrafluoroethylene (PTFE) originally disclosed by Plunkett in US Patent 2,230,654 and copolymers of TFE with low concentrations of copolymerizable modifying monomers. Since Plunkett's discovery, various methods of polymerizing TFE have been developed. PTFE and modified PTFE ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/26C08F2/24C08F2/38C09K3/10
Inventor 张希河韩淑丽刘夫杰
Owner SHANDONG DONGYUE POLYMER MATERIAL
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