Preparation method of polytetrafluoroethylene packed dispersion resin

A technology of polytetrafluoroethylene and dispersed resin, which is applied in the field of polymer material preparation, can solve the problems of high ozone depletion potential, non-compliance with environmental protection, safety, fire and explosion, etc., and achieve low global warming potential and pasty Low extrusion pressure and easy molding process

Active Publication Date: 2020-06-05
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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  • Preparation method of polytetrafluoroethylene packed dispersion resin

Examples

Experimental program
Comparison scheme
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 polytetrafluoroethylene packed dispersion resin. The method comprises the following steps: mixing the filler dispersion liquid with the polytetrafluoroethylene dispersion emulsion; uniform stirring the mixture, modulating the system temperature, adding a condensing agent, stirring the mixture until demulsification is started, adding a non-water-soluble fluorine-containing organic solvent which is a hydrogen-containing fluorocarbon (HFC type), perfluoroalkyl ether (PFAE type) or hydrofluoroether (HFE type) solvent, performing coagulation, and filtering, washing and drying the coagulated product to obtain the polytetrafluoroethylene packed dispersion resin. The polytetrafluoroethylene packed dispersion resin is uniform in filling, narrow in particle size distribution, good in fluidity, small in extrusion pressure and convenient to form and process. The preparation method is green, 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 Applications(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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