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Water-based environment-friendly low-temperature matte coating

A low-temperature, matte technology, applied in epoxy resin coatings, electrophoretic coatings, coatings, etc., can solve the problem of not meeting the green needs of energy saving and environmental protection, the reduction of coating leveling and mechanical properties, the reduction of extinction efficiency and the coating Membrane stability and other issues, to achieve the effect of good bath circulation stability, excellent salt spray resistance, and excellent matte effect

Active Publication Date: 2022-04-05
HAOLISEN CHEM TECH (JIANGSU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, most of the matt coatings on the market use matting powder, matting paste (matting paste) and other materials to achieve a certain matting performance, but the amount of the above-mentioned fillers is relatively large, which will greatly reduce the leveling and mechanical properties of the coating. , reducing the matting efficiency and film stability, the effect of eliminating gloss is still not ideal
In addition, considering factors such as energy conservation and environmental protection, low-temperature baking is often used for general coatings when curing, but the gloss of the coating film obtained by low-temperature baking is generally higher than that of high-temperature baking. In order to reduce gloss, existing matte coatings Still using high-temperature baking to cure, which cannot meet the current green needs of energy saving and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of embodiment 1 cationic modified resin

[0028]

[0029]

[0030] In a flask equipped with a thermometer, a stirrer and a reflux condenser, add bisphenol A epoxy resin with an epoxy equivalent of 188, PPG-400, bisphenol A and methyl isobutyl ketone according to the formula, and heat up to 100°C , add dimethylbenzylamine, continue to heat up to 125°C and stir for 1.5 hours until the epoxy equivalent is 800-900, add propylene glycol monobutyl ether, cool down to 75°C, add diethanolamine and react at 80°C for 1H, then Then add ketimine, raise the temperature to 100° C. and keep it for 2 hours, then lower the temperature to 70° C. to obtain a cation-modified resin.

[0031] The matrix epoxy resin is modified by PPG-400, which improves the reactivity with the crosslinking agent and impact strength, which can improve the flexibility and heat resistance of the coating film; after amination, it forms a cationic modified resin.

Embodiment 2

[0032] Embodiment 2 prepares the first curing agent

[0033] components Dosage (parts by weight) methyl isobutyl ketone 25 HDI trimer 40 Methyl ethyl ketone oxime 15 3,5 Dimethylpyrazole 5 Ethylene glycol ether 5

[0034] Add methyl isobutyl ketone and 3,5 dimethylpyrazole into a reaction vessel with a stirrer and a condenser according to the formula amount, blow nitrogen gas, dissolve and heat up to 75°C, add HDI trimer dropwise, for 1 hour After dropping, continue to drop the mixture of ethylene glycol ether and methyl ethyl ketone oxime. After the dropwise addition, keep warm at 75°C for 2 hours, test NCO<0.5, cool down to below 45°C and discharge to obtain the first curing agent.

Embodiment 3

[0035] Embodiment 3 prepares the second curing agent

[0036]

[0037]

[0038] Add methyl isobutyl ketone, sodium ethoxide, and HDI trimer into a reaction vessel with a stirrer and a condenser according to the formula amount, blow nitrogen, dissolve and heat up to 70°C, add PPG-400, keep warm for 1 hour, and then Continue to add the mixture of diethyl malonate and ethyl acetoacetate dropwise. After the dropwise addition, keep the temperature at 75°C for 2 hours, test NCO<0.5, cool down to below 45°C and discharge to obtain the second curing agent.

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Abstract

The invention discloses a water-based environment-friendly low-temperature matt coating which comprises a low-temperature matt emulsion and low-temperature matt color paste in a weight ratio of 4: 1, according to the coating, methylene is introduced to generate an active hydrogen blocking effect, and a gradient de-blocking composite totally-closed curing agent is adopted, so that a coating film is subjected to a gradient curing process, the surface of the coating film is in a micro concave-convex shape, diffuse reflection of light is formed, the glossiness is greatly reduced, and a very good matte decorative effect is achieved; meanwhile, the components of the coating do not contain heavy metal, the coating has the advantages of being good in groove matching stability, convenient to construct, low in curing temperature and the like, and after electrophoretic coating, a coating film is flat in appearance and has very excellent salt fog resistance.

Description

technical field [0001] The invention belongs to the technical field of electrophoretic coatings, and in particular relates to a water-based environment-friendly low-temperature matte coating. Background technique [0002] After decades of development, electrophoretic coatings have been widely used in the automotive industry and metal coating fields such as building materials, hardware, home appliances, and furniture because of their advantages such as high efficiency, energy saving, and low pollution. [0003] In the field of furniture coating, people find that the surface of the high-gloss coating film is irritating to the user's eyes under the irradiation of light, so a matte with soft luster, no irritation to the human eye, and texture is needed Finishing, matte paint has thus entered people's home life. In addition, matte cathodic electrophoretic coatings are also widely used in automobile and motorcycle parts, home appliances, hardware and electrical machinery and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D17/00C09D5/44C09D7/63C09D7/65C08G59/62C08G59/56C08G59/50C08G59/42
CPCY02P20/10
Inventor 胡浩东刘薇薇赵颖黄磊贾龙娟徐庆
Owner HAOLISEN CHEM TECH (JIANGSU) CO LTD
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