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Preparation method of a weather-resistant and anti-corrosion two-in-one cathodic electrophoretic coating

A cathodic electrophoretic coating, two-in-one technology, used in electrophoretic coatings, coatings, etc., can solve the problems of unbalanced resin ratio, unstable system, different electrophoresis rates, etc., to achieve stable weather resistance and anti-corrosion performance, excellent corrosion resistance Ability, good weather resistance effect

Active Publication Date: 2020-07-21
浙江铭孚金属涂装科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has solved the long-term problem of the different electrophoretic rates caused by the cold blending of acrylic electrophoretic coatings and epoxy electrophoretic coatings for bottom-surface electrophoretic coatings, which leads to the imbalance of the ratio of the two resins in the coating film
However, the author uses ketimine, which is quite sensitive to moisture, as a ring-opening agent for some epoxy groups in acrylic resin. In the case of the presence of ketimine and epoxy groups at the same time, it must be used in the subsequent reaction environment. Strictly control the existence of water vapor, plus ethylenediamine during the grafting reaction with cationic epoxy resin, there is an excessive amount of polyamine compounds in the whole system, and the system is quite unstable
In addition, the two cationic resins are already high-molecular polymers, and then grafted and connected, and compounded with a fully enclosed curing agent, the stability of the emulsion is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The invention discloses a cathodic electrophoretic coating formula and a preparation method thereof which are weather-resistant and anti-corrosion two-in-one. Including: (1) Preparation of modified epoxy resin with double bond at unilateral terminal: Add 2 moles of epoxy equivalent weight low molecular weight epoxy resin into the reaction bottle, stir and heat up to 50-80°C. After reaching the temperature, add 1 mole of amine equivalent weight amine compound and keep warm for 1-2 hours. Afterwards, add 1 mole of carboxylic acid equivalent weight acrylic acid monomer, raise the temperature to 90-110° C., and keep the temperature for 1-2 hours. A modified epoxy resin containing double bonds at the end of one side is obtained.

[0022] Epoxy resin is currently the most cost-effective variety of corrosion resistance among the resins used in the coating industry. The varieties of epoxy resin include bisphenol A (BPA) epoxy resin, bisphenol F (BPF) epoxy resin, and novolac e...

Embodiment 1

[0041] ingredients parts by weight BE-188 376.00 Methylethanolamine 78.86 Methacrylate 90.40

[0042] Add BE-188 into a 1L separate glass reaction vessel equipped with a stirrer, reflux condenser and temperature controller, stir and raise the temperature to 60°C. After reaching the temperature, methylethanolamine was added, the temperature was naturally raised to 90°C, and the temperature was kept for 1 hour. Thereafter, methacrylic acid was added, the temperature was raised to 110°C, and the temperature was maintained for another 2 hours. A modified epoxy resin containing double bonds at the end of one side is prepared.

Embodiment 2

[0044] ingredients parts by weight NPEL-128 370.00 JEFFAMINE M-1000 491.00 acrylic acid 75.66

[0045] Add NPEL-128 into a 1L separate glass reaction vessel equipped with a stirrer, reflux condenser and temperature controller, stir and raise the temperature to 60°C. After reaching the temperature, add JEFFAMINE M-1000, raise the temperature to 90°C naturally, and keep it warm for 1 hour. Thereafter, acrylic acid was added, the temperature was raised to 100° C., and the temperature was maintained for another 2 hours. A modified epoxy resin containing double bonds at the end of one side is prepared.

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Abstract

The invention discloses a preparation method of a two-in-one cathodic electrophoretic coating with weather resistance and corrosion prevention, wherein the preparation method comprises the following steps: carrying out a copolymerization reaction between modified epoxy resin and other acrylic monomers, and further neutralizing to obtain cationic acrylic resin with side chain-grafted epoxy resin; mixing the cationic acrylic resin with the side chain-grafted epoxy resin with a thermal deblocking isocyanate curing agent, and dispersing in an aqueous phase to obtain an electrophoretic emulsion; and mixing the prepared emulsion with homemade color paste as well as pure water according to a ratio to obtain the cathodic electrophoretic coating. The preparation method is reasonable in design, andwhen the electrophoretic coating is applied on a phosphating cold-rolled steel plate for electrophoretic coating, the weather resistance of a paint film after curing is tested to be up to 500 hours ormore than 500 hours, and the neutral salt spray is up to 500 hours or more than 500 hours, which conform to requirements for primer-topcoat coatings.

Description

technical field [0001] The invention relates to the technical field of electrophoretic coatings, in particular to a preparation method of a weather-resistant and anti-corrosion two-in-one cathodic electrophoretic coating. Background technique [0002] Since the first electrophoretic coating line was commercialized in the Ford car factory in the United States in the 1960s, after more than 50 years of development, electrophoretic coating technology has become the mainstream of metal coating. It can evenly deposit the paint film on metal workpieces with complex shapes, thus providing better film performance than other coating methods. Electrophoretic coatings can be divided into cathodic electrophoretic coatings and anodic electrophoretic coatings. Today, cathodic electrophoretic coatings are the mainstay of electrophoretic coating lines. [0003] Cathodic epoxy electrophoretic coating is based on epoxy resin with good corrosion resistance, so it is often used as a protective ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D151/08C09D5/44C08G59/17C08F283/10C08F220/18C08F220/20C08F220/14
CPCC08F283/105C08G59/1466C09D5/4415C09D5/4492C09D151/08C08F220/1804
Inventor 丁志扬顾丽萍
Owner 浙江铭孚金属涂装科技有限公司