Cathode electrophoretic coating containing anti-shrinkage agent and preparation method thereof

A cathodic electrophoretic coating and shrinkage crater technology, which is applied in electrophoretic coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve the problems of poor film leveling, large differences in surface tension, and large usage of electrophoretic coatings. , to achieve the effect of uniform and stable emulsion, low cost and small addition amount

Inactive Publication Date: 2021-06-04
李世冰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the anti-cratering agents for epoxy system cathodic electrophoretic coatings on the market are mainly water-soluble acrylate anti-cratering agents, which are used in large quantities and cost high, and when they are baked and cured, the water evaporates completely, and the acrylate The surface tension of the resin-like resin and the modified epoxy resin is quite different, forming an obvious tension gradient, and the electrophoretic coating film has poor leveling during the baking process.

Method used

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  • Cathode electrophoretic coating containing anti-shrinkage agent and preparation method thereof
  • Cathode electrophoretic coating containing anti-shrinkage agent and preparation method thereof
  • Cathode electrophoretic coating containing anti-shrinkage agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A preparation method of a cathodic electrophoretic coating containing an anti-cratering agent, comprising the following steps:

[0033] (1) Preparation of emulsion

[0034] 40 parts by mass of low-molecular-weight epoxy resin and 20 parts by mass of bisphenol A were reacted for chain extension at 140°C under the catalysis of 0.08 parts by mass of triphenylphosphine for 4 hours, and then 7 parts by mass of diethanolamine was added after the temperature was lowered to 100°C Rise to 115°C and react for 1 hour, then add 32 parts by mass of blocked polyisocyanate compound and 1 part by mass of PPG4000 to react at 80°C for 0.5 hours, and obtain a dispersed resin after cooling, after neutralizing 100 parts by mass of dispersed resin with 5 parts by mass of acetic acid Add 200 parts by mass of water for emulsification under high-speed stirring to prepare an emulsion.

[0035] (2) Preparation of cathodic electrophoretic coating

[0036] Mix the emulsion obtained in step (1) wi...

Embodiment 2

[0039] The only difference from Example 1 is that the amount of PPG4000 added is 2 parts.

Embodiment 3

[0050] The only difference from Example 1 is that the anti-cratering agent is PPG1000, and the addition amount is 0.5 parts.

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Abstract

The invention relates to a cathode electrophoretic coating containing an anti-shrinkage agent and a preparation method thereof, the cathode electrophoretic coating comprises water, emulsion and color paste, the emulsion contains the anti-shrinkage agent, the anti-shrinkage agent is polypropylene glycol, and the molecular weight of the polypropylene glycol is 1000-4000. According to the cathode electrophoretic coating containing the anti-shrinkage agent, the polypropylene glycol anti-shrinkage agent is added, the prepared emulsion is uniform and stable, and the prepared cathode electrophoretic coating effectively restrains oil shrinkage cavities in the baking and curing process, so that the leveling property and glossiness of the coating film are improved.

Description

technical field [0001] The invention belongs to the technical field of electrophoretic coatings, and in particular relates to a cathodic electrophoretic coating containing an anti-cratering agent and a preparation method thereof. Background technique [0002] Cathodic electrophoretic coatings have been widely used in automobiles, construction machinery, electrical appliances, hardware, military and other industries due to their excellent corrosion resistance, high throwing power, smooth coating film, and mechanized and industrialized coating. [0003] However, at present, in the electrophoretic coating of cathodic electrophoretic coatings, the paint film is very prone to shrinkage. Shrinkage refers to the phenomenon of several circular pits of different sizes and distributions that remain after the paint film dries. Improper pre-treatment of substrates (poor degreasing and degreasing), imbalance of bath parameters, dust in the drying room, oil fumes in the circulating air, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D175/08C09D5/44
CPCC09D163/00C09D5/4473C09D5/4476C09D5/4488C08L75/08
Inventor 唐晓冬李世冰赵子刚
Owner 李世冰
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