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Method for preparing epoxy-modified vinyl chloride and acrylate copolymerization emulsion

A vinyl chloride acrylate and copolymer emulsion technology, applied in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of unstable latex, low pH value, etc., and achieve a large market, economic benefits, low environmental pollution, The effect of toughness and corrosion resistance

Active Publication Date: 2018-04-24
WUXI HONGHUI NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymeric emulsions containing vinyl chloride monomer are generally classified as cationic emulsions, with lower pH
It is well known that under acidic conditions epoxy resins are catalyzed to undergo a ring opening reaction and thus the whole latex becomes unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation method of epoxy-modified vinyl chloride acrylate copolymer emulsion, the steps are as follows:

[0017] 1-a Preparation of self-emulsifying epoxy emulsion: In a 2000ml four-neck flask with a mechanical stirring device and a condenser, add 385g of polypropylene glycol diglycidyl ether (Mn=700g / mol), 66g of ethanolamine and 90g of propylene glycol Methyl ether, the temperature is raised to 100°C to start the reaction, and the temperature is raised to 120°C after one hour. After the heat preservation is continued for one hour, 420g of bisphenol A epoxy resin (epoxy d equivalent is 185g / mol) is added and the reaction is continued for 2 hours. After the reaction was finished, the solvent was removed by distillation under reduced pressure, cooled to 50° C., 60 g of glacial acetic acid was added for neutralization, and then 880 g of deionized water and 30 g of Witconol NP-120 (commercial product from AkzoNobel) nonionic surfactant were added to obtain Self-emul...

Embodiment 2

[0021] The preparation method of epoxy-modified vinyl chloride acrylate copolymer emulsion, the steps are as follows:

[0022] 2-a Preparation of self-emulsifying epoxy emulsion: In a 2000ml four-neck flask with a mechanical stirring device and a condenser, add 256g of polypropylene glycol diglycidyl ether (Mn=400g / mol), 78.1g of ethanolamine and 70g of Propylene glycol methyl ether, heat up to 100°C to start reaction, heat up to 120°C after one hour, continue to keep warm for one hour, add 486.4g of bisphenol A epoxy resin (epoxy equivalent is 185g / mol) and continue to stir for 2 hours, After the reaction was finished, the solvent was removed by distillation under reduced pressure, cooled to 50° C., 17.1 g of formic acid was added for neutralization, and then 803 g of deionized water and 20 g of Igepal CO897 (commercial product from Solvay) nonionic surfactant were added. A self-emulsifying aqueous epoxy emulsion is obtained.

[0023] 2-b Monomer pre-emulsification: Weigh 86...

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PUM

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Abstract

The invention discloses a method for preparing epoxy-modified vinyl chloride and acrylate copolymerization emulsion. Particularly, films with high strength and chemical resistance can be formed in drying procedures after the epoxy-modified vinyl chloride and acrylate copolymerization emulsion is coated on protected base materials. The method is characterized by sequentially comprising steps of preparing self-emulsification epoxy resin emulsion; preparing monomer pre-emulsification liquid; preparing the epoxy-modified vinyl chloride and acrylate copolymerization emulsion and the like. The method has the advantages that the epoxy resin content of the epoxy-resin-modified vinyl chloride and acrylate copolymerization emulsion prepared by the aid of the method is higher than 15%, and the epoxy-modified vinyl chloride and acrylate copolymerization emulsion is high in binding power for the base materials and smooth metal surfaces in particular, and is good in stability.

Description

technical field [0001] The invention relates to a coating preparation method. Specifically, it is a method for preparing an epoxy-modified vinyl chloride acrylate copolymer emulsion that can form a film with strong strength and chemical resistance in the drying process after being coated on a protected substrate. Background technique [0002] Chinese patent 102977248B discloses a method for preparing a vinyl chloride-acrylate monomer copolymer emulsion. The emulsion prepared by this method is used for water-based industrial coatings, and has excellent physical properties such as water resistance, salt spray resistance and scratch resistance. However, such emulsions have poor adhesion to metal substrates because the molecular weight of such emulsions is too large to adequately wet the surface of the substrate to be coated, especially smoother surfaces like metals. Therefore, this emulsion is difficult to be used as a coating for metal protection, and the scope of applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F214/06C08F220/18C09D151/08C09D163/00C09D5/08
CPCC08F283/10C09D5/08C09D151/08C09D163/00C08F214/06
Inventor 项洪伟程国栋
Owner WUXI HONGHUI NEW MATERIALS TECH
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