A preparation method of polyacrylate/benzotriazole@zinc oxide microcapsule composite anticorrosion coating

A technology of benzotriazole and polyacrylate, which is applied in the direction of anti-corrosion coatings and coatings, can solve the problems of limited anti-corrosion performance of polyacrylate, difficulty in achieving long-term and durable anti-corrosion, and restricting the application of polyacrylate, so as to benefit Long-term anti-corrosion, improve water resistance and adhesion, and improve the anti-corrosion effect

Active Publication Date: 2020-05-05
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the anti-corrosion performance of polyacrylate modified by the above two methods is still limited, and it is difficult to achieve long-term and durable anti-corrosion effect
Polyacrylate has excellent film-forming properties, chemical resistance, extensibility and adhesion, but due to the poor density of polyacrylate coating film and high water and oxygen transmission rate, it is not conducive to the shielding of metal substrates. Restricts the application of polyacrylate in metal substrate anticorrosion

Method used

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  • A preparation method of polyacrylate/benzotriazole@zinc oxide microcapsule composite anticorrosion coating
  • A preparation method of polyacrylate/benzotriazole@zinc oxide microcapsule composite anticorrosion coating
  • A preparation method of polyacrylate/benzotriazole@zinc oxide microcapsule composite anticorrosion coating

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Experimental program
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Effect test

Embodiment 1

[0044]Dissolve 0.6g of benzotriazole in 5.2g of chloroform to form an oil phase, then add the oil phase and 0.25g of sodium lauryl sulfate into a three-necked flask filled with 30.0g of deionized water, and stir at a constant temperature of 55°C After 2 hours, a stable oil-in-water emulsion was formed. Then slowly add 16.8g of zinc acetate aqueous solution dropwise into the above emulsion, and continue to stir for 3h. Then, 15.66 g of aqueous sodium hydroxide solution was slowly added dropwise, and stirred for 1 h. Finally, put the mixed solution in a constant temperature water bath at 85°C and let it age for 5 hours. The white precipitate in the lower layer was washed with deionized water and dried in an oven at 75°C to obtain benzotriazole@zinc oxide microcapsules. Among them, the mass ratio of zinc acetate to deionized water in the zinc acetate aqueous solution is 1.8:15; the mass ratio of sodium hydroxide to deionized water in the sodium hydroxide aqueous solution is 0.66...

Embodiment 2

[0047] Dissolve 1.5 g of benzotriazole in 5.0 g of chloroform to form an oil phase, then add it and 0.5 g of sodium lauryl sulfate into a three-necked flask filled with 30.5 g of deionized water, and stir at a constant temperature of 55 ° C for 2.5 h, forming a stable oil-in-water emulsion. Then slowly add 21.0 g of zinc acetate aqueous solution dropwise into the above emulsion, and continue stirring for 3.5 h. Then, 17.5 g of sodium hydroxide aqueous solution was slowly added dropwise, and stirred for 1.5 h. Finally, put the mixed solution in a constant temperature water bath at 85°C and let it age for 5 hours. The white precipitate in the lower layer was washed with deionized water and dried in an oven at 75°C to obtain benzotriazole@zinc oxide microcapsules. Among them, the mass ratio of zinc acetate to deionized water in the zinc acetate aqueous solution is 1:20; the mass ratio of sodium hydroxide to deionized water in the sodium hydroxide aqueous solution is 2:15.5.

[...

Embodiment 3

[0050] Dissolve 1.2 g of benzotriazole in 5.1 g of chloroform to form an oil phase, then add it and 0.3 g of sodium lauryl sulfate into a three-necked flask filled with 30.2 g of deionized water, and stir at a constant temperature of 53 ° C for 2.3 h, forming a stable oil-in-water emulsion. Then slowly add 18.8g of zinc acetate aqueous solution dropwise into the above emulsion, and continue to stir for 3.1h. Then, 16.5 g of aqueous sodium hydroxide solution was slowly added dropwise, and stirred for 1.3 h. Finally, the mixed solution was placed in a constant temperature water bath at 83°C and aged for 6 hours, the white precipitate in the lower layer was washed with deionized water, and dried in an oven at 73°C to obtain benzotriazole@zinc oxide microcapsules. Among them, the mass ratio of zinc acetate to deionized water in the zinc acetate aqueous solution is 1:17.8; the mass ratio of sodium hydroxide to deionized water in the sodium hydroxide aqueous solution is 1.5:15.

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Abstract

The invention relates to a preparation method of a polyacrylate / benzotriazole@ zinc oxide microcapsule composite anticorrosive coating. The method includes ultrasonically dispersing benzotriazole@ zinc oxide microcapsules in deionized water; then adding the mixture to a polyacrylate emulsion; stirring at the temperature of 75-80 DEG C for 5-8 h; applying the mixture to the metal surface and dryingto obtain the polyacrylate / benzotriazole@ zinc oxide microcapsule composite anticorrosive coating. A direct encapsulation method is adopted to prepare the benzotriazole@ zinc oxide microcapsules, andthen the microcapsules are blended with thepolyacrylate to prepare the polyacrylate / benzotriazole@ zinc oxide microcapsule composite anticorrosive coating. Compared with the pure polyacrylate coating, the composite coating has better corrosion resistance, and the electrochemical impedance value can be increased by two orders of magnitudes. No flashing occurs, the water resistance is increased by49.74%, the adhesion is increased from level 1 to level 0, and the tensile strength is increased by 55.43%.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coatings, in particular to a method for preparing polyacrylate / benzotriazole@zinc oxide microcapsule composite anti-corrosion coatings. Background technique [0002] Corrosion is the leading cause of industrial accidents and depletion of natural resources as well as economic losses. Therefore, it is of great significance to prevent metal and steel corrosion. Polyacrylate emulsion is an important type of film-forming material, which has excellent bonding performance, weather resistance, film-forming performance, gloss and color retention and mechanical properties, and is widely used in walls, leather, fabrics, wood, etc. surface coating. However, due to the poor compactness of polyacrylate coating film and high water and oxygen transmission rate, it is not conducive to the shielding of metal substrates, which restricts the application of polyacrylate emulsions in the anticorrosion of metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/08C09D133/04
CPCC08K2003/2296C09D5/08C09D133/04C08K3/22C08K5/3475
Inventor 鲍艳陈颖闫妍马建中刘超张文博
Owner SHAANXI UNIV OF SCI & TECH
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