Dispersion resin for cathode electrophoretic coating matched with film pretreatment as well as preparation method and application of dispersion resin

A cathodic electrophoretic coating and dispersing resin technology, applied in the coating field, can solve the problems of poor swimming penetration, weak corrosion resistance, pinholes in galvanized sheets, etc., and achieve good swimming penetration, reduced roughness, and good electric field shielding. Effect

Pending Publication Date: 2022-08-09
上海金力泰化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can better realize the performance requirements for product wettability, throwing power and corrosion resistance in the application of non-phosphorus pretreatment of supporting films, and focus on solving three types of outstanding problems in the pretreatment of supporting films of existing products: 1 .It is prone to wetting and leveling problems such as zirconium prickly heat spots, flow marks, pinholes in galvanized sheets; 2. Poor penetration; 3. Weak anti-corrosion ability

Method used

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  • Dispersion resin for cathode electrophoretic coating matched with film pretreatment as well as preparation method and application of dispersion resin
  • Dispersion resin for cathode electrophoretic coating matched with film pretreatment as well as preparation method and application of dispersion resin
  • Dispersion resin for cathode electrophoretic coating matched with film pretreatment as well as preparation method and application of dispersion resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Preparation of Cathodic Electrophoretic Paint A component - emulsion.

[0049] The emulsion is taken from the workshop, and the methods described in the US patents US2010167072A1, US5868820 and US3984299 can also be referred to for details.

[0050]Prepare the following components in parts by weight: 880 parts epoxy resin 828, 2 parts benzylamine catalyst, 260 parts bisphenol A, 180 parts homemade blocked polyester resin, 60 parts methyl isobutyl ketone, 1100 parts blocked Isocyanate crosslinking agent (prepared by the reaction of diphenylmethane diisocyanate with caprolactam, ethylene glycol butyl ether and trimethylolpropane, the molar ratio of caprolactam, ethylene glycol butyl ether and trimethylolpropane is 2:5 : 3, solid content 90%), 60 parts of N-methyl monoethanolamine, 140 parts of ketimine (by dehydration reaction of diethylenetriamine and methyl isobutyl ketone, solid content 70%), 60 parts of propylene glycol methyl ether, 60 parts of ethylene g...

Embodiment 2

[0052] Example 2: Preparation of Dispersion Resin I.

[0053] (1) prepare the following components in parts by weight: 780 parts of glycidyl neodecanoate, 120 parts of diethylenetriamine, 100 parts of propylene glycol methyl ether;

[0054] Under the protection of inert gas, add diethylenetriamine to the reaction vessel with a stirring device and a circulating cooling device, and control the rotating speed of the stirring device to be 100-200 rpm; add glycidyl neodecanoate dropwise, and open the circulating cooling device at the same time, Incubate for 4 hours at a temperature of 100-120°C; add propylene glycol methyl ether and stir evenly to obtain an amino resin containing active hydrogen, which is for later use;

[0055] (2) Prepare the following components in parts by weight: 280 parts of self-made aliphatic epoxy resins (epoxy equivalent: 350-400), 80 parts of bisphenol A, 4 parts of triphenylphosphine, 20 parts of methyl Isobutyl ketone, 50 parts of propylene glycol met...

Embodiment 3

[0058] Example 3: Preparation of Dispersion Resin II.

[0059] The following components were prepared in parts by weight: 280 parts of homemade aliphatic epoxy resin (epoxy equivalent: 350-400), 80 parts of bisphenol A, 4 parts of triphenylphosphine, 20 parts of methyl isobutyl ketone , 50 parts of propylene glycol methyl ether, 250 parts of amino resin containing active hydrogen obtained in the step (1) of Example 2, 96 parts of thiopropylene glycol, 56 parts of dimethylol propionic acid, 300 parts of deionized water

[0060] Under the protection of inert gas, add epoxy resin, bisphenol A, methyl isobutyl ketone to the reaction vessel with heating device and stirring device, heat to 110-120 ℃, and control the rotating speed of the stirring device to be 100-200rpm; Add triphenylphosphine catalyst, keep the temperature between 130-140 ℃ for 1.5 hours, cool down to 70-90 ℃, and keep the temperature for 1-2 hours;

[0061] The amino resin containing active hydrogen obtained in s...

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Abstract

The invention discloses dispersion resin for a cathode electrophoretic coating matched with film pretreatment, which is characterized in that the dispersion resin is sulfonium salt type dispersion resin as shown in the following structural formula 1. The invention also discloses a preparation method and application of the compound. The dispersion resin prepared by the invention has better wetting and leveling properties, and the roughness of a paint film is reduced; meanwhile, the dispersion resin has better electric field shielding property, a comb claw structure on a side chain has stronger binding force with pigments and fillers, and less organic solvent is used, so that the electrophoretic paint has better throwing power; in addition, a sulfonium bond on a side chain of the dispersion resin has relatively strong binding force with a metal substrate, so that the anti-corrosion capability of a coating is improved. In the matched field of film pretreatment, the dispersion resin has a plurality of advantages and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a dispersing resin for cathodic electrophoretic coatings supporting film pretreatment and a preparation method and application thereof. Background technique [0002] Electrophoretic coating usually refers to a water-based coating in which the main substance in the coating is deposited on the substrate under the action of an electric field, and finally baked into a film. After decades of development, electrophoretic coatings are more and more widely used due to their high coating utilization and strong corrosion resistance. The automotive industry is one of the most important application fields of cathodic electrophoretic coatings. [0003] In recent years, with the continuous improvement of the country's environmental protection requirements, the pre-treatment of the coating industry must be transformed to the direction of no phosphating, so more OEMs have begun to choose a more...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/14C09D5/44C09D7/65
CPCC08G59/1477C08G59/1494C09D5/4457C09D5/4492
Inventor 雷田徐一丁王景强邓力朱叶
Owner 上海金力泰化工股份有限公司
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