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Condensed polytetrafluoroethylene aqueous dispersion, preparation method and application thereof

A technology of polytetrafluoroethylene and water-based dispersion liquid, which is applied in the direction of coating, etc., can solve the problems of inability to balance stability, gloss and coating thickness, etc., achieve gloss improvement, eliminate environmental hazards, and good stability Effect

Active Publication Date: 2012-09-19
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the technical defects that the existing polytetrafluoroethylene aqueous dispersion cannot take into account the stability, gloss and coating thickness, the purpose of the present invention is to provide a polytetrafluoroethylene concentrated aqueous dispersion

Method used

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  • Condensed polytetrafluoroethylene aqueous dispersion, preparation method and application thereof
  • Condensed polytetrafluoroethylene aqueous dispersion, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 32L of deionized water, 1kg of paraffin, and 8g of ammonium perfluorooctanoate to a 50L reactor with a stirring and cooling jacket. After the reactor is evacuated and replaced with nitrogen three times, the temperature is raised to 70°C, and 0.2g of ammonium persulfate is added to the system. Add tetrafluoroethylene monomer to 2.0MPa to start the reaction. The reaction is carried out for 70 minutes, and the temperature is controlled between 70 and 90°C. After the polymerization is completed, a polytetrafluoroethylene water-dispersed polymer emulsion is obtained. The solid content is about 30wt%, and the average particle size is about 0.19 μm.

[0031]Take 1 kg of the above polytetrafluoroethylene aqueous polymerization solution, add 9g of emulsifier A (the cloud point is 37°C, emulsifier brand 15-S-7, DOW company) and 9g of B emulsifier (the cloud point is 89°C, emulsifier brand 15-S-12, DOW Company) to form a mixed emulsifier, stir and mix well, put the polymerizat...

Embodiment 2

[0034] Get 1kg of polytetrafluoroethylene aqueous polymerization solution in embodiment 1, add 6g A emulsifier (cloud point is 34 ℃, emulsifier brand S-70, Nippon Shokubai company) and 12g B emulsifier (cloud point is 80 ℃, Emulsifier grade AEO-9, Nippon Shokubai company) mixed emulsifier, after stirring and mixing, the polymerization solution is placed in a three-necked round-bottomed flask, and the round-bottomed flask is heated in a water bath, and the external temperature rises to 45 ° C. Evacuate to a vacuum of 0.08MPa, the polymerization liquid in the flask boils, and the water vapor enters the collection bottle through the cooling tube until the polymerization liquid is concentrated to the required concentration, and the concentration process is ended. Then use ammonia water to adjust the pH of the polymerization solution to 8-9 to obtain a concentrated aqueous dispersion.

[0035] The solid content of the obtained aqueous dispersion (based on the total weight of the di...

Embodiment 3

[0037] Get 1kg of polytetrafluoroethylene aqueous polymerization solution prepared in Example 1, add 12g A emulsifier (the cloud point is 37 ℃, emulsifier brand 15-S-7, DOW company) and 6g B emulsifier (the cloud point is 80 ℃ , emulsifier brand AEO-9, Nippon Shokubai company) mixed emulsifier, after stirring and mixing, the polymerization solution is placed in a three-necked round-bottomed flask, and the round-bottomed flask is heated in a water bath, and the external temperature is raised to 60 ° C. After condensation The tube is evacuated to a vacuum of 0.09MPa, the polymerization liquid in the flask is boiling, and the water vapor is cooled by the condenser tube and enters the collection bottle until the polymerization liquid is concentrated to the required concentration, and the concentration process is ended. Then use ammonia water to adjust the pH of the polymerization solution to 8-9 to obtain a concentrated aqueous dispersion.

[0038] The solid content of the obtaine...

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Abstract

The invention relates to condensed polytetrafluoroethylene aqueous dispersion, which comprises 30-65wt% of polytetrafluoroethylene dry material and 3-10wt% of emulsifying agent relative to the polytetrafluoroethylene dry material, wherein the emulsifying agent comprises secondary alcohol ethoxylate emulsifying agent A of which the cloud point is 30-45DEG C, and secondary alcohol ethoxylate emulsifying agent B of which the cloud point is 70-95DEG C, and the mass ratio of the emulsifying agent A to the emulsifying agent B is (2:3)-(3:2). The invention also provides a preparation method for the condensed polytetrafluoroethylene aqueous dispersion and an application of the condensed polytetrafluoroethylene aqueous dispersion to preparing water-based paint. The condensed polytetrafluoroethylene aqueous dispersion provided by the invention has good stability, a film with a thicker coating can be obtained in the processing and applying process, the glossiness can be drastically improved, and the condensed polytetrafluoroethylene aqueous dispersion can be effectively used for various water-based paints. The preparation method provided by the invention has the advantages of simple technology and strong maneuverability and is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the field of polytetrafluoroethylene aqueous dispersion, in particular to a polytetrafluoroethylene concentrated aqueous dispersion containing an emulsifier, a preparation method and an application thereof. Background technique [0002] PTFE concentrated dispersion has excellent corrosion resistance, weather resistance, solvent resistance, low friction coefficient, wear resistance, impact resistance, etc., and is widely used in offshore platforms, drilling rigs, port machinery facilities, culverts, tunnels Anti-corrosion, as well as anti-corrosion of chemical pipelines, reaction equipment, crude oil pipelines, etc., in transportation, aviation aircraft, spacecraft, artificial satellites, rockets, land trains, automobiles, sea ships, etc. need to run at high speed, reduce resistance, and avoid friction hurt. [0003] The commonly used polytetrafluoroethylene emulsion concentration method is called chemical concentration. The op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08J3/03C09D127/18C09D7/12
Inventor 张建新胡显权姚权卫张春静周云峰杨帆秦向明
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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