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Carboxyl-terminated polyester resin modified epoxy resin and preparation method thereof, electrophoretic coating and preparation method thereof

A carboxyl-terminated polyester and epoxy resin technology, applied in electrophoretic coatings, polyurea/polyurethane coatings, coatings, etc., can solve problems such as unsatisfactory corrosion resistance and poor coating adhesion, and achieve leveling Enhanced performance, good durability, and improved solubility

Active Publication Date: 2021-03-23
KEDE CHEM IND SHUNDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if these additives form a layer of coating on the formed cathodic electrophoretic coating film, it will lead to poor adhesion with the next coating, or other properties of the coating film, especially the corrosion resistance is not satisfactory

Method used

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  • Carboxyl-terminated polyester resin modified epoxy resin and preparation method thereof, electrophoretic coating and preparation method thereof
  • Carboxyl-terminated polyester resin modified epoxy resin and preparation method thereof, electrophoretic coating and preparation method thereof

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preparation example Construction

[0093] In a second aspect, in at least one embodiment, a method for preparing a carboxyl-terminated polyester resin modified epoxy resin is provided, comprising the following steps:

[0094] (a) Epoxy resin and bisphenol A are mixed homogeneously and heated, add basic catalyst and keep warm for a period of time, obtain polyepoxide;

[0095] (b) adding carboxyl-terminated polyester resin to the obtained polyepoxide, then adding a basic catalyst, and reacting to obtain mixture A;

[0096] (c) adding methyl isobutyl ketone and a basic catalyst to the cooled mixture A, heating and reacting to obtain mixture B;

[0097] (d) adding a hyperbranched isocyanate curing agent to the cooled mixture B, and cooling after a period of heat preservation to obtain a carboxyl-terminated polyester resin modified epoxy resin;

[0098] Preferably, in step (a), the heating temperature is 130-135°C, the holding temperature is 140-145°C, and the holding time is 4-6h;

[0099] Preferably, the reactio...

Embodiment 1

[0150] A carboxyl-terminated polyester resin modified epoxy resin, mainly prepared from the following raw materials in parts by weight:

[0151] 50 parts of carboxyl-terminated polyester resin, 700 parts of bisphenol A epoxy resin, 250 parts of bisphenol A, 260 parts of methyl isobutyl ketone, 30 parts of hyperbranched isocyanate curing agent, N,N-dimethylbenzylamine 1.0 parts, 40 parts of N-methylethanolamine and 19 parts of ketimine of amine ethylethanolamine.

[0152] The carboxyl-terminated polyester resin is mainly prepared from the following raw materials in parts by weight: 30 parts of propylene oxide, 0.2 parts of triethanolamine, 20 parts of formic acid and 45 parts of maleic anhydride.

[0153] The hyperbranched isocyanate curing agent is mainly prepared from the following raw materials in parts by weight: 40 parts of hexamethylene diisocyanate trimer, 45 parts of trimethylolpropane, 20 parts of methyl isobutyl ketone and dibutyltin dilaurate 0.5 servings.

Embodiment 2

[0155] A carboxyl-terminated polyester resin modified epoxy resin, mainly prepared from the following raw materials in parts by weight:

[0156] 200 parts of carboxyl-terminated polyester resin, 650 parts of bisphenol A epoxy resin, 300 parts of bisphenol A, 220 parts of methyl isobutyl ketone, 50 parts of hyperbranched isocyanate curing agent and 100 parts of N-methylethanolamine.

[0157] The carboxyl-terminated polyester resin is mainly prepared from the following raw materials in parts by weight: 32 parts of propylene oxide, 0.3 parts of triethanolamine, 22 parts of formic acid and 45 parts of maleic anhydride.

[0158] The hyperbranched isocyanate curing agent is mainly prepared from the following raw materials in parts by weight: 44 parts of hexamethylene diisocyanate trimer, 43 parts of trimethylolpropane, 22 parts of methyl isobutyl ketone and dibutyltin dilaurate 0.5 servings.

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Abstract

The invention belongs to the field of electrophoretic coatings, and in particular relates to a carboxyl-terminated polyester resin modified epoxy resin and a preparation method thereof, an electrophoretic coating and a preparation method thereof. The carboxyl-terminated polyester resin modified epoxy resin comprises the following raw materials in parts by weight. Made: 50-200 parts of carboxyl-terminated polyester resin, 650-700 parts of epoxy resin, 250-300 parts of bisphenol A, 220-260 parts of methyl isobutyl ketone, 30-50 parts of hyperbranched isocyanate curing agent and 60-100 parts of basic catalyst. The carboxy-terminated polyester resin modified epoxy resin electrophoretic coating has excellent properties such as toughness, wear resistance, impact resistance and scratch resistance, and can reduce the amount of solvent, and the bath liquid has good stability. The solubility is improved, the leveling is improved, and the coating film has no yellowing after high-temperature baking or over-baking.

Description

technical field [0001] The invention relates to the technical field of electrophoretic paint, in particular to a carboxyl-terminated polyester resin modified epoxy resin and a preparation method thereof, and an electrophoretic paint and a preparation method thereof. Background technique [0002] Electrophoretic coatings have been developed with various special properties since they are widely used in the field of automobile body and auto 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] First of all, whit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C08G18/67C08G63/58C09D175/14C09D187/00C09D5/44
CPCC08G18/67C08G63/58C08G81/00C09D5/4419C09D5/4465
Inventor 梁卫南阮超进高睿邓仲明
Owner KEDE CHEM IND SHUNDE
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