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A kind of water-based high-temperature medium-coating paint and preparation method thereof

A high-temperature, painting technology, applied in coatings, anti-corrosion coatings, polyurea/polyurethane coatings, etc., can solve problems such as complex processes, save energy, shorten process time, and improve work efficiency.

Active Publication Date: 2022-07-26
湖南梓先新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the coating process of domestic automobiles mainly adopts the "three-coating and two-baking" process (3C2B for short). One set of spray booth and two sets of drying equipment, the process is more complicated

Method used

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  • A kind of water-based high-temperature medium-coating paint and preparation method thereof
  • A kind of water-based high-temperature medium-coating paint and preparation method thereof
  • A kind of water-based high-temperature medium-coating paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This example provides a water-based high-temperature mid-coating paint, comprising the following preparation raw materials in parts by weight:

[0048] Waterborne polyurethane A: 15-20 parts, water-based polyurethane B: 15-20 parts, blocked isocyanate: 5-10 parts, amino resin: 5-10 parts, titanium dioxide: 15-20 parts, nano-precipitated barium sulfate: 10-15 parts parts, kaolin: 10-15 parts, filler: 3-7 parts, cosolvent: 3-5 parts, dispersant: 2-4 parts, substrate wetting agent: 0.5-1.0 parts, interface control agent: 1.0-3.0 parts parts, auxiliary: 1.0 to 3.0 parts.

[0049] The pigment-to-base ratio of the water-based high-temperature paint is 2-2.5:1.

[0050] Among them, the number average molecular weight of the water-based polyurethane A is 4000-6000, and the hydroxyl value is 4.2. The number average molecular weight of the water-based polyurethane B is 3000-5000, and the hydroxyl value is 2.

[0051] The solid content of blocked isocyanate is 75-85%.

[0052]...

Embodiment 2

[0059] This example provides the preparation method of water-based high-temperature medium-coating paint, including the following steps:

[0060] S1: put water-based polyurethane A, water-based polyurethane B, blocked isocyanate and amino resin in sequence, stir at a speed of 100-200 rpm, add the remaining preparation raw materials while stirring, increase the rotation speed to 200-300 rpm and stir for 15-20 min;

[0061] S2: Increase the stirring speed to 300-400 rpm, and grind after stirring for 30-45 min.

Embodiment 3

[0063] In this example, according to the preparation raw material ratio provided in Example 1 and the preparation method provided in Example 2, 5 kinds of coatings were prepared under the same process conditions, and the specific proportions are shown in Table 1.

[0064]Table 1 paint ratio details

[0065]

[0066]

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Abstract

The invention provides a water-based high-temperature middle-coating paint and a preparation method. The water-based high temperature intermediate paint includes the following preparation raw materials: water-based polyurethane A, water-based polyurethane B, blocked isocyanate, amino resin, titanium dioxide, nano-precipitated barium sulfate, kaolin, filler, cosolvent, dispersant, substrate wetting agent, viscosity And interface control additives and auxiliaries. Under the compounding of two water-based polyurethanes and the cross-linking curing of blocked isocyanates and amino resins, the middle coat paint changes the 3C2B process in the prior art into a 3C1B process, shortens the process time of water-based wet-on-wet construction, and reduces the need for wet-on-wet construction. The time interval of wetting is 1.5 to 3 minutes, which improves work efficiency and achieves the same surface effect as the existing dry-on-wet process.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based high-temperature mid-coating and a preparation method. Background technique [0002] Compared with other application fields, automotive coatings have the highest requirements on the appearance of coatings. Automotive coatings generally use four processes of primer, middle coating, base paint, and varnish, or three processes of primer, middle coating, and topcoat. At present, most of the shell substrates of high-end automobiles are aluminum alloys, which do not have high requirements for anti-corrosion. Water-based paints can be used for primers and middle coats. Two-component water-based paints can also be used for primers or topcoats according to the gloss requirements of pigment properties. Polyurethane coating. [0003] At present, the domestic automobile coating process mainly adopts the "three coating and two baking" (3C2B for short) process. Se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D175/06C09D161/32C09D5/08C09D7/63C09D7/65
CPCC09D175/04C09D175/06C09D5/08C09D7/63C09D7/65C08K2003/2241C08K2003/3045C08K2201/011C08L2205/02C08L75/06C08L61/32C08K13/02C08K5/29C08K3/22C08K3/30C08K3/346C08L75/04
Inventor 毛政国王连攀
Owner 湖南梓先新材料有限公司
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