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Vinyl chloride copolymer emulsion for water-based anticorrosive coating as well as preparation method and application thereof

A vinyl chloride copolymerization and anti-corrosion coating technology, applied in the field of chemical engineering, can solve the problems of increased film-forming temperature of copolymer emulsion, decreased anti-corrosion performance, complicated preparation process, etc. effect of the process

Active Publication Date: 2020-06-05
江苏利思德新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all use organic solvents as the medium for polymerization, and rely on high content of hydrophilic monomers or their aminated derivatives to achieve aqueous phase dispersion, and the preparation process is relatively complicated.
At the same time, the introduction of a large amount of rigid, chlorine-free monomers leads to an increase in the film-forming temperature of the copolymer emulsion and a decrease in anti-corrosion performance

Method used

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  • Vinyl chloride copolymer emulsion for water-based anticorrosive coating as well as preparation method and application thereof
  • Vinyl chloride copolymer emulsion for water-based anticorrosive coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 150g deionized water, 35g vinyl chloride, 25g chloropropene and isobutyl vinyl ether (the mass ratio of chloropropene and isobutyl vinyl ether is 1:1), 2g maleic anhydride, 2.5 g sodium lauryl sulfate and 0.5 g α-propenyl alkylphenol polyoxyethylene ether ammonium sulfate compound emulsifier, 0.2 g sodium bisulfite reducing agent, heat up to 55 ° C, drop at a rate of 2.0 g / hour Add 5% ammonium persulfate aqueous solution to start the polymerization, and continuously add 38g of vinyl chloride monomer to keep the pressure of the polymerization system basically unchanged. After the addition of vinyl chloride is completed, continue the reaction until the system pressure drops by 1.0kg / cm 2 , the polymerization was completed by cooling, and the unreacted vinyl chloride, propylene chloride and isobutyl vinyl ether were removed to obtain a modified chloroether copolymer emulsion with a solid content of 35.6%.

Embodiment 2

[0024] Add 150g deionized water, 35g vinyl chloride, 25g chloropropene and isobutyl vinyl ether (mass ratio of chloropropene and isobutyl vinyl ether is 1:1.5), 2g maleic anhydride, 2.5 g sodium lauryl sulfate and 0.5 g of α-propenyl alkylphenol polyoxyethylene ether ammonium sulfate compound emulsifier, 0.2 g of sodium bisulfite reducing agent, warming up to 55 ° C, dripping at a rate of 2.0 g / h Add 5% ammonium persulfate aqueous solution to start polymerization, and continuously add 38g of vinyl chloride monomer to keep the pressure of the polymerization system basically unchanged. After the addition of vinyl chloride is completed, continue to react until the system pressure drops by 1.0kg / cm 2 , the polymerization was completed by cooling, and the unreacted vinyl chloride, chloropropene and isobutyl vinyl ether were removed to obtain a modified chloroether copolymer emulsion with a solid content of 35.8%.

Embodiment 3

[0026]Add 150g deionized water, 35g vinyl chloride, 25g chloropropene and isobutyl vinyl ether (mass ratio of chloropropene and isobutyl vinyl ether is 1:2), 2g maleic anhydride, 2.5 g sodium lauryl sulfate and 0.5 g of α-propenyl alkylphenol polyoxyethylene ether ammonium sulfate compound emulsifier, 0.2 g of sodium bisulfite reducing agent, warming up to 55 ° C, dripping at a rate of 2.0 g / h Add 5% aqueous solution of ammonium persulfate to start polymerization, and continuously add 38g of vinyl chloride monomer to keep the pressure of the polymerization system basically unchanged. After adding vinyl chloride, continue to react until the system pressure drops by 1.0kg / cm 2 , the polymerization was completed by cooling, and the unreacted vinyl chloride, propylene chloride and isobutyl vinyl ether were removed to obtain a modified chloroether copolymer emulsion with a solid content of 36.1%.

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Abstract

The invention discloses a vinyl chloride copolymer emulsion for water-based anticorrosive coating and a preparation method thereof. The method comprises: adding deionized water, vinyl chloride, chloropropene, isobutyl vinyl ether, maleic anhydride, an emulsifier and a reducing agent into a reactor; stirring and heating to 45-60 DEG C, continuously dropwise adding an ammonium persulfate initiator aqueous solution; and starting polymerization, continuously supplementing vinyl chloride in the polymerization process, controlling the supplementing speed of the vinyl chloride, maintaining the pressure change of the polymerization system to be + / -0.1 kg / cm<2>, continuously polymerizing until the pressure of the system is reduced by 0.5-2.0 kg / cm<2> after the supplementation of the vinyl chlorideis finished, cooling to finish polymerization, and removing unreacted monomers to obtain the vinyl chloride copolymer emulsion. According to the invention, the chlorine content of the copolymer is increased by introducing the addition amounts of the chloropropene monomer and the isobutyl vinyl ether, and meanwhile, the cohesive monomer maleic anhydride is introduced, so that the obtained vinyl chloride copolymer can be used for preparing water-based coating with a good anti-corrosion effect and cohesiveness.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a vinyl chloride copolymer emulsion for water-based anticorrosion coatings and a preparation method and application thereof. Background technique [0002] Chlorine-containing polymers, such as vinyl chloride-isobutyl vinyl ether copolymer, vinyl chloride-vinyl acetate copolymer, chlorosulfonated polyethylene, chlorinated polypropylene, and chlorinated rubber, are important matrix resins for the preparation of anti-corrosion coatings. Its anti-corrosion performance is closely related to the chlorine content of the polymer. At present, chlorine-containing polymers are mainly dissolved in organic solvents (such as aromatic hydrocarbons, ketones, or esters) to prepare anti-corrosion coatings. Although they have the advantages of fast film formation and good film compactness, the content of volatile organic compounds (VOC) High, unfriendly to the environment, restricting...

Claims

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Application Information

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IPC IPC(8): C08F214/06C08F214/14C08F216/20C08F222/06C08F283/06C08F2/26C09D127/06C09D151/08C09D5/08
CPCC08F214/06C08F283/065C08F2/26C09D127/06C09D151/08C09D5/08C08F214/14C08F216/20C08F222/06
Inventor 李金忠包永忠
Owner 江苏利思德新材料股份有限公司
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