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A kind of aqueous fluoropolymer dispersion emulsion and preparation method thereof

A technology for dispersing emulsions and polymers, applied in the field of aqueous fluoropolymer dispersion emulsions and their preparation, can solve problems such as unfavorable fluorine-containing emulsion stability, fluorine-containing emulsion breaking, etc. The effect of corrosion

Active Publication Date: 2019-01-22
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

Patent CN102161769 reports a fluorine-containing emulsion and a stabilization method. Although this method can improve the appearance of the fluorine-containing emulsion, the added oxidant and EDTA are not conducive to the stability of the fluorine-containing emulsion, and may even cause the fluorine-containing emulsion to be demulsified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Aggregation

[0028] Add 30Kg of water, 20g of perfluorooctanoic acid ammonium emulsifier and 0.05g of ammonium persulfate initiator (the mass ratio of water: emulsifier: initiator is 100:0.067:0.00017) into the autoclave, and feed 6Kg of vinylidene fluoride , 9Kg of fluorine-containing mixed monomers of chlorotrifluoroethylene, vacuumize, and after the oxygen content is less than 50ppm, continue to feed the mixed monomers of vinylidene fluoride and chlorotrifluoroethylene in the same proportion (mass ratio 2:3), so that The pressure of the autoclave reaches and maintains 1.6MPa; the polymerization reaction occurs at a temperature of 70°C; 200g of ammonium carbonate wt% 10 aqueous solution is continuously added during the polymerization process, the pH of the control system is 8, and the polymerization is carried out for 3 hours to obtain an aqueous solution with a solid content of 28%. Fluoropolymer dispersion emulsion;

[0029] 2) concentrated

[0030] Add 600g o...

Embodiment 2

[0033] 1) Aggregation

[0034] Add 32Kg of water, 20g of perfluorooctanoic acid ammonium emulsifier and 0.05g of potassium persulfate initiator (the mass ratio of water: emulsifier: initiator is 100:0.063:0.00016) into the autoclave, and feed 3.2Kg of perfluorooctanoate The fluorine-containing mixed monomer of propylene, 11.8Kg tetrafluoroethylene is vacuumized, and after the oxygen content is less than 50ppm, continue to pass into the mixed monomer (mass ratio 16:59) of perfluoropropylene and tetrafluoroethylene in the same proportion, so that The pressure of the autoclave reaches and maintains 3.0MPa; polymerization occurs at a temperature of 90°C; 200g of ammonium carbonate wt% 10 aqueous solution is continuously added during the polymerization, the pH of the control system is 8, and the polymerization takes 2.5 hours to obtain an aqueous solution with a solid content of 25%. Fluoropolymer dispersion emulsion;

[0035] 2) concentrated

[0036] Add 750g of nonylphenol poly...

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Abstract

The invention relates to a water-based fluorine-containing polymer dispersed emulsion and a preparation method thereof. The method comprises the following steps: 1) adding deionized water, an initiator and an emulsifier into a high-pressure kettle, and introducing a fluorine-containing monomer mixture to carry out polymerization reaction, wherein a pH regulator is continuously added in the polymerization process to control the pH value of the polymerization system at 7-8; and 2) after the polymerization reaction finishes, adding a surfactant into the fluorine-containing polymer dispersed emulsion, and concentrating in a water bath, wherein the pH regulator is continuously added in the concentration process to keep the pH value of the concentration system at 7-8. The method effectively reduces the iron ion content in the emulsion, thereby reducing the scum of the fluorine-containing polymer dispersed emulsion, and effectively improving the appearance of the fluorine-containing dispersed emulsion. The added pH regulator can be effectively removed in the construction process, and thus, can not pollute the product.

Description

technical field [0001] The invention relates to a water-based fluorine-containing polymer dispersion emulsion and a preparation method thereof, belonging to the technical field of fluorine-containing chemical industry. Background technique [0002] Fluoropolymers refer to synthetic polymer materials containing fluorine atoms in the main chain or side chain carbon atoms. Fluoropolymers have excellent weather resistance, high temperature resistance, aging resistance, dielectric properties, and low friction These characteristics make this type of material widely used in aerospace, petrochemical, machinery, electronics, construction and other fields. [0003] At present, one of the methods for preparing fluoropolymers is to use inorganic initiators to synthesize fluoropolymers, but this results in molecular chains containing more unstable end groups, such as carboxyl (-COOH), double bond unsaturated Base (-CF=CF 2 ), acid fluoride group (-COF), etc., these groups are oxidized ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/24C08F214/22C08F214/26C08F214/28C08F2/38
CPCC08F2/38C08F214/24C08F214/26C08F214/22C08F214/28
Inventor 余金龙汪仲权曾波张廷健王先荣龚蓉
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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