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A kind of multi-color low-gloss waterborne acrylic polyurethane topcoat for railway passenger car and preparation method thereof

A technology of acrylic polyurethane and water-based acrylic, which is applied in the direction of polyurea/polyurethane coatings, multi-color effect coatings, coatings, etc. It can solve the problems of poor gloss stability of paint films, lower gloss of topcoats, and expensive matting powder. The effect of reducing the content of volatile organic compounds, stabilizing the gloss of the paint film, and eliminating potential safety hazards

Active Publication Date: 2022-06-28
SHANXI HUABAO NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual method is to choose a water-based acrylic resin with a high hydroxyl value, and add a large amount of matting powder to reduce the gloss of the top coat. However, the disadvantage of this method is that the gloss stability of the paint film is not good, and the gloss of the original design may be lost. Risk, on the other hand, matting powder is more expensive, no cost advantage

Method used

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  • A kind of multi-color low-gloss waterborne acrylic polyurethane topcoat for railway passenger car and preparation method thereof
  • A kind of multi-color low-gloss waterborne acrylic polyurethane topcoat for railway passenger car and preparation method thereof
  • A kind of multi-color low-gloss waterborne acrylic polyurethane topcoat for railway passenger car and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The present invention provides a method for preparing the above-mentioned multi-color low-gloss water-based acrylic polyurethane topcoat for railway passenger cars, comprising the following steps:

[0033] The first step is to prepare component A: Weigh each component according to the formula, first mix 4 / 5 of deionized water, 1 / 5 of hydroxyl-containing water-based acrylic resin, 1 / 2 of defoamer, dispersant, Wetting agent is added under stirring at 300-400r / min speed. After adding, stir for 10-15min and mix evenly. Slowly add rheological additives, increase the speed to 600-800r / min and stir for 15-20min, and then add various pigments. , 800-1000r / min high-speed dispersing and stirring for 20-30min to obtain pre-dispersed slurry; grind the pre-dispersed slurry to a fineness of less than 15 μm on a sand mill to obtain a finely ground slurry; Add 4 / 5 of hydroxyl-containing water-based acrylic resin, self-matting water-based polyurethane resin, 1 / 2 of defoamer, co-solvent,...

Embodiment 1--4

[0037] Example 1-4 Weigh the raw materials according to the proportioning amount in the following table 1, and process the multi-color low-gloss water-based acrylic polyurethane topcoat products for railway passenger cars according to the process parameters and the preparation method of the preparation method in Table 2, as shown in Table 1. and Table 2.

[0038] Table 1: Example 1-4 raw material ratio table

[0039]

[0040]

[0041] Table 2: Process parameter table of Examples 1-4

[0042]

[0043]

[0044] The process parameters involved in Table 2 correspond to the process parameters involved in the first step of the preparation process respectively. Among them, "adding the first batch of materials" and "adding the second batch of materials" respectively correspond to the process of adding multiple raw materials in the first step.

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Abstract

The invention discloses a multi-color low-gloss waterborne acrylic polyurethane topcoat for railway passenger cars and a preparation method thereof. The topcoat includes component A and component B; component A includes: hydroxyl-containing waterborne acrylic resin 55-60 5-15 parts of self-dulling water-based polyurethane resin, 0.1-0.3 parts of dispersant, 2.0-3.0 parts of wetting agent, 0.1-0.3 parts of defoamer, 5-12 parts of pigment, 0.1-10 parts of water-based organic color paste, 0.1-0.3 parts of rheological additives, 0.2-0.4 parts of leveling agents, 0.2-0.3 parts of thickeners, 0-3 parts of matting powder, 4-8 parts of co-solvents, 100 parts of deionized water; component B Contains: 75‑80 parts of water dispersible polyisocyanate, 20‑25 parts of solvent. The gloss of the paint film of the invention is stable and lasts for a long time, meeting the glossiness requirements of the outer surface of the Fuxing EMU with a speed of 160km / h; water is used as a diluent to greatly reduce the content of volatile organic compounds.

Description

technical field [0001] The invention relates to a multicolor low-gloss waterborne acrylic polyurethane topcoat for railway passenger cars and a preparation method thereof, belonging to the technical field of waterborne coatings. Background technique [0002] In recent years, the state has vigorously advocated and promoted the use of environment-friendly products. CRRC Group proposed a green transformation strategy of applying water-based paints in steps on the surfaces of trucks, locomotives and motor vehicles. The use of coatings on railway passenger cars and locomotives is increasing year by year. The 160km / h power concentrated Fuxing EMU developed by a subsidiary of CRRC puts forward specific requirements on the protective and decorative properties of the topcoat on the outer surface. Resistance indicators such as water resistance, artificial climate resistance accelerated test, mechanical properties and hardness must meet the requirements of Q / CR 581-2017, and the gloss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D7/20C09D7/61C09D5/29C09D5/08
CPCC09D175/04C09D7/20C09D7/61C09D5/29C09D5/08C08K2003/2241C08K3/22C08K3/04
Inventor 韩连山孙锋郭泽方田计青
Owner SHANXI HUABAO NEW MATERIALS CO LTD
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