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Preparation method of fluorine-containing polymer powder

A polymer and powder technology, which is applied in the field of preparation of fluorine-containing polymer powder, can solve the problems of high energy consumption and achieve the effects of reducing the amount of coagulation agent, saving production costs and shortening the coagulation time

Active Publication Date: 2020-06-30
中化蓝天氟材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to be demulsified by cooling and freezing first, and then washed with hot water, which consumes a lot of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Press 70L of ethylene-chlorotrifluoroethylene (ECTFE) emulsion with a solid content of 11.2% into the coagulation bucket, add 280L of deionized water to dilute, and the diluted emulsion has a solid content of 2.2%. Turn on the stirring, stir the ECTFE emulsion in the coagulation barrel at 250rpm, and raise the temperature of the ECTFE emulsion to 55°C while stirring. Add 150 g of calcium chloride into the coagulation bucket, increase the stirring speed to 2000 rpm, and continue stirring for 20 minutes. Obtain the ECTFE resin that demulsification separates out after stopping stirring. Wash the ECTFE resin separated by demulsification with normal temperature deionized water until the conductivity is less than 5 μS / cm, and dry it in an oven at 105° C. for 24 hours to obtain ECTFE powder.

[0035] After demulsification and precipitation of ECTFE resin, the coagulation wastewater is clear and transparent, with a solid content of 0.12% and a coagulation efficiency of 99.88%....

Embodiment 2

[0037] Press 80L of ECTFE emulsion with a solid content of 15.1% into the coagulation bucket, add 320L of deionized water to dilute, and the diluted emulsion has a solid content of 3.0%. Turn on the stirring, stir the ECTFE emulsion in the coagulation bucket at 280rpm, and raise the temperature of the ECTFE emulsion to 60°C while stirring. Add 200 g of calcium chloride to the coagulation barrel, increase the stirring speed to 2200 rpm, and continue stirring for 20 minutes. Obtain the ECTFE resin that demulsification separates out after stopping stirring. Wash the ECTFE resin separated by demulsification with normal temperature deionized water until the conductivity is less than 5 μS / cm, and dry it in an oven at 105° C. for 24 hours to obtain ECTFE powder.

[0038] After demulsification and precipitation of ECTFE resin, the coagulation wastewater is clear and transparent, with a solid content of 0.11% and a coagulation efficiency of 99.89%.

Embodiment 3

[0040] Press 60L of ECTFE emulsion with a solid content of 19.7% into the coagulation barrel, add 412L of deionized water to dilute, and the diluted emulsion has a solid content of 2.5%. Turn on the stirring, stir the ECTFE emulsion in the coagulation bucket at 300rpm, and raise the temperature of the ECTFE emulsion to 60°C while stirring. Add 180 g of calcium chloride into the coagulation bucket, increase the stirring speed to 2300 rpm, and continue stirring for 25 minutes. Obtain the ECTFE resin that demulsification separates out after stopping stirring. Wash the ECTFE resin separated by demulsification with normal temperature deionized water until the conductivity is less than 5 μS / cm, and dry it in an oven at 105° C. for 24 hours to obtain ECTFE powder.

[0041]After demulsification and precipitation of ECTFE resin, the coagulation wastewater is clear and transparent, with a solid content of 0.09% and a coagulation efficiency of 99.91%.

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Abstract

The invention provides a preparation method of fluorine-containing polymer powder, wherein the preparation method is realized by jointly using a coagulant and a mechanical coagulation mode and settingdifferent mechanical stirring speeds before and after the adding of the coagulant. The preparation method provided by the invention has the advantages of high emulsion coagulation efficiency, short coagulation time and the like.

Description

technical field [0001] The invention belongs to the field of polymer materials and relates to a preparation method of fluorine-containing polymer powder Background technique [0002] Fluoropolymers are widely used in many industrial fields due to their excellent mechanical strength, impact resistance, radiation resistance, chemical resistance and weather resistance. Representative products in fluoropolymers such as polyethylene-chlorotrifluoroethylene (ECTFE), is a thermoplastic fluoropolymer, compared with other thermoplastics, its: resistance to chlorine and chlorine derivatives at high temperatures Excellent; good toughness, high hardness, excellent impact resistance; excellent electrical properties; extremely low permeability to water vapor and other gases. Therefore, polyethylene-chlorotrifluoroethylene is widely used in the fields of electrical and electronic industry, pharmaceutical industry, chemical equipment anticorrosion, solar energy packaging film materials and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L27/12C08L23/08C08L27/16C08L27/20
CPCC08J3/12C08J2327/12C08J2323/08C08J2327/16C08J2327/20
Inventor 高鹏飞郑刚刘勇营
Owner 中化蓝天氟材料有限公司
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