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Modified cationic microgel and preparation method and application thereof

A cationic and microgel technology, used in coatings, anti-corrosion coatings, electrophoretic coatings, etc., can solve the problems of poor water solubility, high risk of gelation, and high roughness of electrophoretic coatings

Active Publication Date: 2020-07-10
GUANGDONG KODEST EP SC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods for preparing modified cationic microgels in the prior art include epoxy-amines, acrylics, siloxanes, etc., but there are the following defects: the design of epoxy chain extension requires a sufficiently large molecular weight to achieve microcoagulation. Therefore, it is difficult to control in the production process and the risk of gelation is high; electrophoretic coatings need to add a large amount of microgel to meet the anti-corrosion requirements of sharp edges, but at the same time, the anti-corrosion properties of sharp edges are still not good enough; microgel water The dispersed particles of the dispersion are large in size and poor in water solubility, resulting in high coating roughness and poor appearance leveling of the electrophoretic coating; the addition of microgel to the electrophoretic coating generally leads to poor interlayer adhesion and bonding with the substrate. It is impossible to take into account the disadvantages of sharp edge anti-corrosion and comprehensive anti-corrosion performance at the same time

Method used

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  • Modified cationic microgel and preparation method and application thereof
  • Modified cationic microgel and preparation method and application thereof
  • Modified cationic microgel and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh the raw material components, mix 10 parts of epoxy resin, 5 parts of bisphenol A and 10 parts of methyl isobutyl ketone; in an inert atmosphere, raise the temperature to 90 ° C, stir; add 0.01 parts of N, N-bis Methylbenzylamine, heat up to 120°C and keep warm, carry out epoxy chain extension reaction until the epoxy equivalent is 900-1200g / mol; cool down to 80°C, add 5 parts of polyurethane sulfide and 5 parts of methyl isobutyl ketone, Stir, add 1 part of deionized water and 5 parts of dimethylolpropionic acid, keep warm for 2 hours, take samples to test the viscosity of the material every 1 hour, until the viscosity does not change any more; add 10 parts of deionized water, stir, add 10 parts of Hydrolyzable epoxy resin, heat preservation reaction at 80°C for 4-10 hours, then add 1-5 parts of acetic acid for neutralization, and discharge to obtain modified cationic microgel 1.

Embodiment 2

[0048] Weigh the raw material components, mix 50 parts of epoxy resin, 25 parts of bisphenol A and 25 parts of methyl isobutyl ketone; in an inert atmosphere, raise the temperature to 110 ° C, stir; add 0.1 parts of N, N-bis Methylbenzylamine, heat up to 170°C and keep warm, carry out epoxy chain extension reaction until the epoxy equivalent is 900-1200g / mol; cool down to 100°C, add 25 parts of polyurethane sulfide and 10 parts of methyl isobutyl ketone, Stir, add 5 parts of deionized water and 15 parts of dimethylolpropionic acid, keep warm for 2 hours, take samples to test the viscosity of the material every 1 hour, until the viscosity does not change any more; add 50 parts of deionized water, stir, add 30 parts of The epoxy resin can be hydrolyzed, the temperature is raised to 100°C, the temperature is kept for 10 hours, and then 5 parts of acetic acid is added for neutralization, and the material is discharged to obtain the modified cationic microgel 2.

Embodiment 3

[0050] Weigh the raw material components, mix 30 parts of epoxy resin, 15 parts of bisphenol A and 18 parts of methyl isobutyl ketone; in an inert atmosphere, heat up to 100 °C and stir; add 0.05 parts of N, N-di Methylbenzylamine, heat up to 140°C and keep warm, carry out epoxy chain extension reaction until the epoxy equivalent is 900-1200g / mol; cool down to 90°C, add 10 parts of polyurethane sulfide and 8 parts of methyl isobutyl ketone, Stir, add 3 parts of water and 10 parts of dimethylol propionic acid, keep warm for 2 hours, take samples to test the viscosity of the material every 1 hour, until the viscosity does not change; add 30 parts of water, stir, add 20 parts of hydrolyzable epoxy Resin, heat preservation reaction at 90°C for 7 hours, then add 3 parts of acetic acid for neutralization, and discharge to obtain modified cationic microgel 3.

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Abstract

The invention belongs to the technical field of electrophoretic paint preparation, and discloses a modified cationic microgel which is mainly prepared from epoxy resin, bisphenol A, an organic solvent, a basic catalyst, polyurethane sulfide, acid, water, hydrolyzable epoxy resin and the like, and due to the existence of thiosalt in an epoxy main chain and tertiary amine in the hydrolyzable epoxy resin, the prepared microgel tape has a cationic characteristic,so that the water dispersibility of the microgel is improved; meanwhile, polyurethane sulfide with a sulfur structure is introduced intothe main chain of the modified cationic microgel, and the binding force of the modified cationic microgel to the base material and the sharp edge corrosion resistance of the electrophoretic coating are improved when the polyurethane sulfide is crosslinked and cured with all components in the formula. The invention also provides an electrophoretic paint, and the electrophoretic paint obtained by compounding the modified cationic microgel has good sharp edge corrosion resistance, excellent comprehensive corrosion resistance and appearance leveling property and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrophoretic coating preparation, and in particular relates to a modified cationic microgel and its preparation method and application. Background technique [0002] Electrophoretic coatings are widely used in the fields of automobile body and automobile parts. In particular, the electrophoretic coating method mainly based on cathodic electrophoretic coating has developed rapidly since it was put into industrial production in the 1960s due to its excellent coating film performance, high coating utilization rate and low VOC content. Today, cathodic electrophoretic coatings are widely used in industries and fields such as automobile bodies, automobile and motorcycle parts, home appliances, furniture accessories, hardware, electromechanical, and military industries. [0003] The cathodic electrophoretic coating is baked at a specified temperature to cross-link and cure the resin coated on the substrate. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/075C09D5/44C09D5/08C09D201/00C08L63/00C08L75/04
CPCC08J3/246C08J3/075C09D5/448C09D5/08C08J2363/00C08J2475/04
Inventor 梁卫南皮跃方邓仲明高睿李文庄
Owner GUANGDONG KODEST EP SC CO LTD