Low-temperature thermocuring polyurethane coating, and preparation method and application thereof

A technology of polyurethane coating and low-temperature thermal curing, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of complex construction process, non-environmental protection, high energy consumption of coatings, etc., and achieve high construction solid content, high production efficiency, good storage stability

Active Publication Date: 2014-04-02
中华制漆(新丰)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-temperature thermosetting polyurethane coating and its preparation method and application, aiming to solve the problems of the existing coatings such as high energy consumption, environmental protection, and complicated construction process.

Method used

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  • Low-temperature thermocuring polyurethane coating, and preparation method and application thereof
  • Low-temperature thermocuring polyurethane coating, and preparation method and application thereof
  • Low-temperature thermocuring polyurethane coating, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: White paint

[0056] Table 1

[0057] Name

Mass percentage

Acrylic

45

Dispersant

0.5

Anti-settling agent

0.5

Titanium Dioxide

28

Blocked isocyanate

16

Drier

1.5

Leveling agent

0.3

Defoamer

0.2

Adhesion promoter

2

Mixed solvent

6

[0058] a: Toner pre-dispersed

[0059] Mix the acrylic resin, dispersant, anti-settling agent, and mixed solvent in proportions, and stir for 5-10 minutes at 800-1200rpm in a high-speed disperser; then, add titanium dioxide slowly in proportion at a speed of 600rpm After the addition is complete, increase the speed to 1200rpm and disperse for 30 minutes for use;

[0060] b: Color paste grinding

[0061] Use a sand mill to grind the premixed slurry prepared in the first step above to a fineness of not less than 15μm

[0062] c: paint

[0063] The remaining propylene resin and the sealing curing agent, auxiliary agent, and mixed solvent are mixed in proportion, and stirred in a high-speed disperser at 800-1200 rpm for...

Embodiment 2-7

[0066] The operation steps and reaction conditions are the same as in Example 1, and the specific amounts of raw materials are shown in Table 2.

[0067] Table 2

[0068]

[0069] In Examples 1-7, the specific components of each component used are shown in the following table.

[0070]

[0071] The properties of the low-temperature thermal curing polyurethane coatings are shown in Table 3.

[0072] table 3

[0073]

[0074]

[0075]

[0076] Remarks: The baking temperature for each performance test is 100℃×30 minutes.

[0077] The difference between the product of the present invention and the traditional baking varnish, two-component polyurethane coating and low-temperature baking varnish is shown in Table 4.

[0078] Table 4

[0079]

[0080]

[0081] It can be seen from Table 4 that the product of the present invention can achieve good film properties when baked at 100°C, single-tank packaging, good storage stability, and all properties are better than traditional amino baking paint and...

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Abstract

The invention relates to a low-temperature thermocuring polyurethane coating, and a preparation method and application thereof. The low-temperature thermocuring polyurethane coating mainly comprises, by weight, 40 to 70 parts of acrylic resin, 0.5 to 1 part of dispersing agent, 0.2 to 0.5 part of anti-settling agent, 0 to 28 parts of pigment and filler, 15 to 20 parts of closed curing agent, 1 to 2 parts of catalyst, 2 to 4 parts of adhesion accelerant and 5 to 10 parts of mixed solvent. The low-temperature thermocuring polyurethane coating has the advantages of short reaction time, shallow chromaticity, good stability, using convenience in single component, small energy consumption in low temperature solidification and the like, can be widely applied to decoration and protection of electroplating pieces, metal machine casings, buttons, automobile paints and the like, is a formaldehyde-free high-performance coating meeting the standard of toy paints, and has great implementing value and social and economic benefits.

Description

Technical field [0001] The invention relates to the field of polyurethane coatings, in particular to a low-temperature thermal curing polyurethane coating and a preparation method and application thereof. Background technique [0002] At present, the single-component baking varnish used for the coating of workpieces has a high baking temperature, generally above 140°C, and consumes a lot of energy. Electroplating substrates are developing rapidly in the industry, and the application fields are expanding. Because the substrates are prone to blistering when baking over 120℃, the curing temperature of conventional amino baking varnishes is above 140℃, which damages customer materials. The solid color storage stability of heat-curing low-temperature baking paint is poor, and high-gloss solid color paint cannot be prepared. One-component amino baking paint is not environmentally friendly. The paint film contains formaldehyde. The main hazards of formaldehyde to human health are as fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C08G18/80
Inventor 汤志强易跃华
Owner 中华制漆(新丰)有限公司
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