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A kind of preparation method of filling polytetrafluoroethylene dispersion resin

A polytetrafluoroethylene and dispersing resin technology, which is applied in the field of polymer material preparation, can solve problems such as fire and explosion, high ozone depletion potential, non-compliance with environmental protection, safety, etc., and achieve easy molding and processing, and global warming potential small size, good fluidity

Active Publication Date: 2022-05-06
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chlorofluoroalkanes and chlorinated alkanes have high ozone depletion potential and are flammable. During the condensation process or drying process, due to static electricity or heating, there is a risk of fire and explosion. In addition, chlorinated alkanes have Strong carcinogenicity, does not conform to the concept of green environmental protection and safety

Method used

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  • A kind of preparation method of filling polytetrafluoroethylene dispersion resin

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Experimental program
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Effect test

Embodiment 1

[0040] A kind of preparation method of filling polytetrafluoroethylene dispersion resin, comprises steps as follows:

[0041] (1) Add 170g of graphite powder with an average particle size of 2 μm into 500mL of deionized water containing 5.1g of non-ionic surfactant nonylphenol polyoxyethylene ether NP-15, stir and disperse evenly to obtain a graphite powder dispersion;

[0042] (2) The graphite powder dispersion obtained in step (1) is added to a coagulation tank with a multi-stage stirring blade with an internal volume of 12L, and the average particle diameter added is 220nm, the standard relative specific gravity SSG is 2.160, and the solid content is 10.88 6172g of polytetrafluoroethylene dispersion emulsion, stirred for 3 minutes at a stirring speed of 400rpm, mixed uniformly, adjusted the system temperature to 18°C, added 1mL of nitric acid solution with a mass fraction of 65%, continued to stir for 4 minutes, and the reaction system started Enter the demulsification stat...

Embodiment 2

[0045] A kind of preparation method of filling polytetrafluoroethylene dispersion resin, comprises steps as follows:

[0046] (1) Add 170g of graphite powder with an average particle size of 2 μm into 500mL of deionized water containing 5.1g of non-ionic surfactant nonylphenol polyoxyethylene ether NP-15, stir and disperse evenly to obtain a graphite powder dispersion;

[0047] (2) The graphite powder dispersion obtained in step (1) is added to a coagulation tank with a multi-stage stirring blade with an internal volume of 12L, and the average particle diameter added is 220nm, the standard relative specific gravity SSG is 2.160, and the solid content is 10.88 6172g of polytetrafluoroethylene dispersion emulsion, stirred for 3 minutes at a stirring speed of 400rpm, mixed uniformly, adjusted the temperature of the system to 21°C, added 1mL of nitric acid solution with a mass fraction of 65%, continued to stir for 4 minutes, and the reaction system started Enter the demulsificati...

Embodiment 3

[0050] A kind of preparation method of filling polytetrafluoroethylene dispersion resin, comprises steps as follows:

[0051] (1) Add 170g of graphite powder with an average particle size of 2 μm into 500mL of deionized water containing 5.1g of non-ionic surfactant nonylphenol polyoxyethylene ether NP-15, stir and disperse evenly to obtain a graphite powder dispersion;

[0052] (2) The graphite powder dispersion obtained in step (1) is added to a coagulation tank with a multi-stage stirring blade with an internal volume of 12L, and the average particle diameter added is 220nm, the standard relative specific gravity SSG is 2.160, and the solid content is 10.88 6172g of polytetrafluoroethylene dispersion emulsion, stirred for 3 minutes at a stirring speed of 400rpm, mixed uniformly, adjusted the temperature of the system to 21°C, added 1mL of nitric acid solution with a mass fraction of 65%, continued to stir for 4 minutes, and the reaction system started Enter the demulsificati...

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Abstract

The invention provides a preparation method of filled polytetrafluoroethylene dispersion resin, comprising the following steps: mixing the filler dispersion liquid with polytetrafluoroethylene dispersion emulsion, stirring evenly, adjusting the temperature of the system, adding a coagulating agent, and stirring until starting When breaking the emulsion, add a non-water-soluble fluorine-containing organic solvent for coagulation, and then filter, wash, and dry to obtain a polytetrafluoroethylene-filled dispersion resin. The non-water-soluble fluorine-containing organic solvent is a hydrogen-containing fluorocarbon (HFCs), perfluoroalkyl ethers (PFAEs) or hydrofluoroethers (HFEs) solvents. The filled polytetrafluoroethylene dispersion resin prepared by the invention has uniform filling, narrow particle size distribution, good fluidity, low extrusion pressure and is convenient for molding and processing. The preparation method of the invention is environmentally friendly and safe.

Description

technical field [0001] The invention relates to a preparation method of filled polytetrafluoroethylene dispersion resin, which belongs to the technical field of polymer material preparation. Background technique [0002] PTFE has high chemical stability and excellent lubricity, strong corrosion resistance, high and low temperature resistance, and is widely used in chemical, mechanical, electrical, construction, medical and other fields. Among PTFE products, filled PTFE dispersion resin is the one with the largest output. The wear resistance, heat resistance, dimensional stability, electrical conductivity and other properties of polytetrafluoroethylene are improved by adding different fillers such as inorganic, metal and high polymer to polytetrafluoroethylene resin. [0003] Chinese patent document CN103755982A provides a preparation method of filled polytetrafluoroethylene dispersion resin, including steps: 1) the specific gravity is 1.04~1.08g / cm 3 2) add graphite and / or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/09C08J3/20C08L27/18C08K3/04C08L81/06
CPCC08J3/093C08J3/095C08J3/20C08J2327/18C08K3/04C08J2481/06C08K2201/003
Inventor 陈越马鹏飞李宝杰
Owner SHANDONG DONGYUE POLYMER MATERIAL
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