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A kind of sulfonium salt type dispersion resin for cathodic electrophoretic coating and preparation method thereof

A cathodic electrophoretic coating and dispersing resin technology, applied in the coating field, can solve the problems of poor appearance of the paint film, and achieve the effects of low VOC content, easy large-scale operation and low processing cost

Active Publication Date: 2019-03-22
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Li Xiangtao used zirconium film technology as a pre-treatment to improve the bonding force and corrosion resistance of the paint film and the substrate (see Li Xiangtao, Research on Pre-treatment of Cathodic Electrophoretic Coating [D], Master's Degree Thesis of Dalian University of Technology, 2013), However, the cost of zirconium phosphating is still higher than that of iron-based phosphating
Nie Rentai once added high-equivalent epoxy resin to the electrophoretic paint film that used iron-based phosphating as a pre-treatment, which increased the cross-linking degree of the paint film and improved the electrophoretic paint film’s resistance to iron-based phosphating to a certain extent. Excellent corrosion resistance performance (see Nie Rentai, SGMW vehicle corrosion resistance and body anticorrosion technology research [D], Jilin University master's degree thesis, 2011), but the high equivalent epoxy resin has brought about leveling problems , leading to poor appearance of the paint film

Method used

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  • A kind of sulfonium salt type dispersion resin for cathodic electrophoretic coating and preparation method thereof
  • A kind of sulfonium salt type dispersion resin for cathodic electrophoretic coating and preparation method thereof
  • A kind of sulfonium salt type dispersion resin for cathodic electrophoretic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of component A of cathodic electrophoretic paint—emulsion.

[0040] For the preparation method, reference may be made to the methods described in US8486538B2, US4419467, and US3984299.

[0041] Prepare the following components in parts by weight: 816 parts of epoxy resin 828, 2 parts of methyltriphenylphosphonium iodide catalyst, 384 parts of bisphenol A, 60 parts of xylene, 847 parts of blocked isocyanate crosslinking agent ( Prepared by reacting toluene diisocyanate with isooctyl alcohol and trimethylolpropane, the molar ratio of isooctyl alcohol to trimethylolpropane is 7:3, the solid content is 85%), 45 parts of N-methyl monoethanolamine, 144 Parts of ketimine (made by dehydration reaction of diethylenetriamine and methyl isobutyl ketone, solid content 85%), 120 parts of propylene glycol n-butyl ether, 60 parts of propylene glycol phenyl ether, 24 parts of glacial acetic acid, 3500 parts parts deionized water.

[0042] Under the protection o...

Embodiment 2

[0043] Example 2: Preparation of sulfonium salt type dispersion resin.

[0044] (1) Prepare the following components in parts by weight: 174 parts of 2,4-toluene diisocyanate (molecular weight 174g / mol), 200 parts of polyether 204 (average molecular weight 400g / mol), 90 parts of methyl isobutyl Base ketone, 130 parts of isooctyl alcohol (molecular weight 130g / mol);

[0045] Such as figure 1 As shown, under the protection of nitrogen, add 2,4-toluene diisocyanate into a four-neck flask with a stirrer, circulating cooling water and a high level tank, and control the speed at 400rpm; add polyether 204 dropwise, and turn on the cooling circulating water at the same time After 3 hours of dropping, keep warm at 30°C for 2 hours; add isooctyl alcohol dropwise, finish dropping in 2 hours, keep warm at 30°C for 3 hours; add methyl isobutyl ketone, stir well, and get small molecule thickening semi-blocked isocyanate ( figure 1 and Figure 4 X component in), spare.

[0046] (2) Prep...

Embodiment 3

[0052] Example 3: Preparation of component B of cathodic electrophoretic paint—color paste.

[0053] Prepare the following components in parts by weight: 314 parts of sulfonium salt type dispersion resin prepared in Example 2, 460 parts of deionized water, 260 parts of china clay, 40 parts of carbon black, 8 parts of bismuth oxide and 1 part of Surfynol104E Type wetting agent (produced by Air Products Co., Ltd. of the United States);

[0054] Add deionized water to the reaction vessel with a high-speed stirring device, and control the speed at about 1200rpm; add sulfonium salt type dispersion resin and disperse evenly; add china clay, carbon black, bismuth oxide and Surfynol 104E wetting agent and mix evenly Grinding with a high-speed grinder, controlling the rotational speed at about 3000rpm, grinding for 2 hours until the fineness is less than 20 microns, and obtaining the color paste for later use.

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Abstract

The invention belongs to the technical field of paint, and relates to sulfonium salt type dispersion resin for cathodic electrophoretic paint and a preparation method of the sulfonium salt type dispersion resin. The preparation method of the dispersion resin comprises the following steps of 1), preparing a micromolecular thickener semi-closed isocyanate; 2), preparing a thioether compound semi-closed isocyanate containing reactive hydrogen; 3), preparing an alcohol compound or alcohol ether compound semi-closed isocyanate; 4), preparing the dispersion resin. A sulfur atom in a thioether bond on a side chain of the dispersion resin can form an iron-sulfur bond with an iron base material; further, the binding force between a coating and a metallic base material is improved; the corrosion-resistant capacity and the redissolution-resistant capacity of the coating are improved; meanwhile, the dispersion resin has better leveling property, so the luster of the coating can be improved; in addition, the dispersion resin belongs to water-base dispersion resin; organic solvents are used less; the dispersion resin has a low-VOC (Volatile Organic Compounds) environmentally friendly characteristic. Compared with quaternary ammonium salt type dispersion resign, the dispersion resin has many advantages, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of coatings, and relates to a sulfonium salt type dispersion resin capable of improving the corrosion resistance, surface gloss and resolubility resistance of cathodic electrophoretic coatings and a preparation method thereof. Background technique [0002] Electrophoretic coatings usually refer 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 to form a film. After decades of development, electrophoretic coatings have become more and more important in the coatings industry, which is mainly due to the high utilization rate of coatings, strong corrosion resistance, and good environmental performance. [0003] The automotive industry is one of the most important application fields of cathodic electrophoretic coatings. The cathodic electrophoretic coatings used in this field usually use epoxy resin as the mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79C08G18/58C08G18/08C09D5/44C09D175/04C09D5/08C09D17/00
CPCC08G18/0809C08G18/58C08G18/794C08G2150/90C09D5/08C09D5/18C09D5/4465C09D17/005C09D175/04
Inventor 胡东波陈子辉李涛胡中方基祥吕赟
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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