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Modified epoxy resin, preparation method and application thereof, cathodic electrophoretic coating and preparation method and application thereof

A cathodic electrophoretic coating and epoxy resin technology, which is applied in the coating field, can solve the problem that the stone-strike resistance cannot meet the requirements of automobiles and related parts, etc.

Active Publication Date: 2019-01-22
GUANGDONG KODEST EP SC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Electrophoretic coatings originated in the 1930s, and began to study synthetic cationic resins in the mid-1960s, and were used as primers for household appliances requiring high corrosion resistance in the early 1970s, and then gradually developed Cathodic electrophoretic coatings with higher corrosion resistance and decorative effects, due to their excellent corrosion resistance, high penetration rate, high leveling, high decoration, high degree of coating automation, and less coating pollution, Cathodic electrophoretic coatings are widely used in the motor vehicle industry, and are widely used in building materials, light industry, household appliances and other industrial fields, as well as surface corrosion and decoration of hardware and handicrafts. However, the stone chip resistance of current cathodic electrophoretic coatings cannot meet Requirements for automobiles and related parts

Method used

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  • Modified epoxy resin, preparation method and application thereof, cathodic electrophoretic coating and preparation method and application thereof
  • Modified epoxy resin, preparation method and application thereof, cathodic electrophoretic coating and preparation method and application thereof
  • Modified epoxy resin, preparation method and application thereof, cathodic electrophoretic coating and preparation method and application thereof

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preparation example Construction

[0134] According to the second aspect of the present invention, the preparation method of modified epoxy resin is provided, and method comprises the following steps:

[0135] (a) bisphenol A and polyether polyol react with epoxy resin under catalyst, make hydroxyl and epoxy group react;

[0136] (b) adding a ketimine-containing alcohol in step (a), so that the hydroxyl group reacts with the epoxy group;

[0137] (c) Add carbamate-containing isocyanate, polyether amine and solvent in step (b), so that the amino group reacts with the epoxy group, and the isocyanate reacts with the hydroxyl group on the epoxy resin to obtain a modified epoxy resin resin.

[0138] Bisphenol A and polyether polyol react with epoxy resin under the catalyst to make the hydroxyl group react with the epoxy group, then add the alcohol containing ketimine to make the hydroxyl group react with the epoxy group, and then add the amino group Formic acid ester isocyanate, polyether amine and solvent make th...

Embodiment 1

[0185] 1. Modified epoxy resin

[0186] A modified epoxy resin is mainly prepared from the following raw materials in parts by weight:

[0187] 26.09 parts of epoxy resin 128E, 8.49 parts of bisphenol A, 3.67 parts of polyether polyol (polyethylene glycol 400), 0.05 parts of triethylamine (TEA), 6.5 parts of alcohol containing ketimine, containing carbamate 13.7 parts of isocyanate, 11.48 parts of polyetheramine D2000, 9.81 parts of MIBK (methyl isobutyl ketone), 15.22 parts of PM (propylene glycol methyl ether), 4.92 parts of PMA (propylene glycol methyl ether acetate).

[0188] 2. Preparation of modified epoxy resin

[0189] (1) Add epoxy resin 128E, bisphenol A, polyether polyol, MIBK, and triethylamine to a four-neck flask equipped with a stirrer, reflux condenser, and thermometer, and keep at 180°C for 4 hours.

[0190] (2) Cool down to 150°C, add alcohol containing ketimine, and keep at 150°C for 4h.

[0191] (3) Cool down to 120°C, add carbamate-containing isocyanate...

Embodiment 2

[0201] 1. Modified epoxy resin

[0202] A modified epoxy resin is mainly prepared from the following raw materials in parts by weight:

[0203] 26.09 parts of epoxy resin 128E, 8.49 parts of bisphenol A, 3.67 parts of polyether polyol (polyethylene glycol 400), 0.05 parts of triethylamine (TEA), 6.5 parts of alcohol containing ketimine, containing carbamate 13.7 parts of isocyanate, 11.48 parts of polyetheramine D2000, 9.81 parts of MIBK (methyl isobutyl ketone), 15.22 parts of PM (propylene glycol methyl ether), 4.92 parts of PMA (propylene glycol methyl ether acetate).

[0204] 2. Preparation of modified epoxy resin

[0205] (1) Add 30 parts by weight of monoethanolamine and 70 parts by weight of MIBK into a four-necked flask equipped with a stirrer, reflux condenser, and thermometer, and react at 170°C for reflux for 12 hours, and keep 170°C under negative pressure of -80kPa Reflux dehydration for 24h, that is, the alcohol containing ketimine is obtained.

[0206] (2) In...

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Abstract

The invention provides modified epoxy resin, a preparation method and an application thereof, a cathodic electrophoretic coating and a preparation method and an application thereof, which belong to the technical field of the coating. The modified epoxy resin is mainly prepared from the following raw materials by weight: 20-32 parts of epoxy resin, 6-12 parts of bisphenol A, 2.5-5 parts of polyether polyol, 0.02-0.15 parts of a catalyst, 4-10 parts of ketimine-containing alcohol, 10-16 parts of carbamate-containing isocyanate, 8-15 parts of polyetheramine, and 22-40 parts of a solvent. The modified epoxy resin has flexible functional groups and more crosslinking sites, so that the modified epoxy resin of the invention and the cathodic electrophoretic coating using the modified epoxy resin can maintain excellent physical and chemical properties, and have excellent anti-stone chip performance, so that the cathodic electrophoretic coating can better meet the coating performance requirements of automobiles and related parts.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a modified epoxy resin and its preparation method and application, cathodic electrophoretic coating and its preparation method and application. Background technique [0002] The stone impact test mainly uses compressed air to drive the gravel impact coating to evaluate the toughness of automobile paint or similar coatings impacted by gravel. The coating stone impact test is a comprehensive evaluation of the mechanical properties of the entire coating system. , which can reflect the flexibility, adhesion, impact resistance, and compatibility with the substrate of the coating. It is also one of the most important testing items for evaluating the secondary mechanical properties of the coating. [0003] Electrophoretic coatings originated in the 1930s, and began to study synthetic cationic resins in the mid-1960s, and were used as primers for household appliances requiri...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L75/08C09D163/00C09D175/08C09D5/44C09D5/08C09D7/61
CPCC08K2003/2241C08L63/00C08L2312/00C09D5/08C09D5/4442C09D5/4457C09D163/00C08L75/08C08K13/02C08K3/04C08K3/22
Inventor 杨波黎健恩高睿邓仲明
Owner GUANGDONG KODEST EP SC CO LTD
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