Vinyl chloride copolymer emulsion for water-based anticorrosion coating and its preparation method and application
A vinyl chloride copolymerization and anti-corrosion coating technology, applied in the field of chemical engineering, can solve the problems of decreased anti-corrosion performance, increased film-forming temperature of copolymer emulsion, complicated preparation process, etc., and achieves the effects of good stability and good anti-corrosion performance
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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, propylene chloride 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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