Soap-free emulsion containing polytrifluorochloroethylene and its prepn

A soap-free emulsion and chlorotrifluoroethylene technology, applied in the field of ternary fluoropolymer emulsion and its preparation, can solve the problems of difficult adsorption, harsh polymerization conditions, expensive fluorocarbon surfactants, etc., and achieve environmental pollution. Small and stable

Inactive Publication Date: 2005-07-13
UNIV OF JINAN
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Use fluorocarbon surfactants to carry out emulsion polymerization of fluorine-containing functional monomers such as perfluoroalkyl acrylate and vinyl monomers. The polymerization mechanism is the same as that of ordinary emulsion polymerization. The conditions are simple and the operation is easy to control, and stable copolymerization can be obtained. Polymer emulsions, copolymer emulsions have good water resistance, oil resistance, weather resistance and corrosion resistance, but fluorocarbon surfactants are extremely expensive and cannot be used on a large scale
Cross-linkable fluorine-containing copolymers can be prepared by emulsion copolymerization of acrylate monomers and / or other vinyl monomers with surface-active fluorine-containing polymers as dispersion stabilizers, but the emulsifier—fluorine-containing Polymer synthesis is difficult, the polymerization conditions are harsh, and the operation is cumbersome
Fluorine-containing emulsion polymerization is carried out with a conventional emulsification system. Since the fluorine-containing monomer is water-repellent and oil-repellent, it is difficult for ordinary emulsifiers to adsorb on the surface of the fluorine-containing monomer, and the ideal emulsification effect cannot be achieved. The synthesized emulsion unstable

Method used

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  • Soap-free emulsion containing polytrifluorochloroethylene and its prepn
  • Soap-free emulsion containing polytrifluorochloroethylene and its prepn

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Fluorine content of polymer in emulsion (%)

example 2

[0022] 600g of deionized water, 112g of vinyl acetate, 18g of heptenoic acid, 12g of sodium hydroxide and 1.9g of potassium persulfate were added to a 1.5L high-pressure reactor with electromagnetic stirring. After three times of replacement with nitrogen gas, replacement with chlorotrifluoroethylene, and vacuum pumping, connect the feed valve of the reactor to the storage tank of chlorotrifluoroethylene, add 300 g of chlorotrifluoroethylene to the reactor, close the valve to raise the temperature, and stir , when the temperature in the kettle reaches 70±2°C, add 38g of vinyl acetate, 9g of heptenoic acid, and 70g of chlorotrifluoroethylene into the reaction kettle continuously from the liquid metering tank through the injection pump, and the pressure after the feeding is about 1.8Mpa, After 24 hours, when the reaction pressure in the kettle was about 1.1 MPa, the reaction was terminated, and the material was cooled and discharged. The mixture obtained by the above reaction is...

example 3

[0025] Fluorine content of polymer in emulsion (%)

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PUM

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Abstract

The present invention describes soap-free emulsion polymerization process to prepare fluorous emulsion. The fluorous emulsion is prepared with trifluorochloroethylene as main component and through the ternary copolymerization of three kinds of monomer including trifluorochloroethylene, alphatic olefine ester and alphatic olefine acid; and has homogeneous grains and high storage stability. The copolymerization is completed in a high pressure reactor with water, monomers and initiator, at 65-75 deg.c and 0.7-2.5 MPa condition for 20-45 hr. The fluorous emulsion has solid content of 21-35 %, and polymer number average molecular weight of 7000-9500, and may be stored stably for over 6 months without lamination and gelatinizing.

Description

(1) Technical field [0001] The invention relates to a fluorine-containing emulsion copolymer and a preparation method thereof, in particular to a ternary fluorine-containing polymer emulsion in which an emulsifier mainly composed of chlorotrifluoroethylene participates in a copolymerization reaction and a preparation method thereof. (2) Background technology [0002] The research on organic fluorine polymers began in 1938, when R. Plunkett of DuPont Corporation in the United States first synthesized organic fluorine polymers - polytetrafluoroethylene (PTFE), which was insoluble in organic solvents and difficult to shape. In 1982, Japan's Asahi Glass Co., Ltd. first developed Lumiflon, a fluororesin soluble in organic solvents and curable at room temperature (JP Patent Publication No. 61-57609), which can be used to prepare highly weather-resistant architectural coatings. However, the weakness of this solvent-based room temperature curing fluoropolymer is that it contains a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/22C08F214/24
Inventor 张书香耿兵夏攀登
Owner UNIV OF JINAN
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