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Automobile finish paint composite coating capable of being rapidly cured and having long activation period and preparation method thereof

A composite coating and automotive topcoat technology, which is applied in coatings, pretreatment surfaces, and devices for coating liquids on surfaces, can solve problems such as fast drying speed, accelerated reaction, and shortened construction time, so as to improve drying speed , prolong the activation period, improve the effect of fullness

Inactive Publication Date: 2020-04-03
QINGYUAN HAOYU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the composite coating of 1k base coat + 2k finish varnish, the 1k base coat is physically dry without chemical cross-linking reaction, and the drying speed is fast. The 2K finish varnish needs -OH and -NCO to produce chemical cross-linking reaction , the drying speed is slow, especially in winter, due to the low temperature, the coating film cannot reach the hardness required for polishing after construction, resulting in delayed delivery, which is an urgent problem to be solved at present
The conventional solution is to add a drier to the 2k varnish or to heat the coating film or to carry out the two methods at the same time. Although it can effectively promote the chemical crosslinking reaction and increase the drying speed, while the drying speed is increased , also brings some disadvantages
For example, heating the coating film requires power consumption and increases the cost; adding a drier to the 2k varnish will cause the reaction of the varnish A component to be mixed with B component to accelerate, the molecular weight will increase, the viscosity will increase, and the construction time will be greatly shortened. short pot life
It shows that the mixed solution in the construction state after mixing must be used up in a short time, otherwise the viscosity of the whole mixed solution will increase, and the coating film will produce a lot of orange peel during spraying, or the phenomenon of threading will occur, and a complete coating film will not be formed, and the viscosity will eventually rise and solidify. Glue, so it cannot meet the requirements of vehicle spraying construction time and process

Method used

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  • Automobile finish paint composite coating capable of being rapidly cured and having long activation period and preparation method thereof
  • Automobile finish paint composite coating capable of being rapidly cured and having long activation period and preparation method thereof
  • Automobile finish paint composite coating capable of being rapidly cured and having long activation period and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The car topcoat composite coating that can be cured quickly and has a long pot life provided by the present embodiment is an automobile topcoat composite coating composed of three kinds of paint coatings sprayed successively from bottom to top, wherein: the first One layer is a 1k base paint layer sprayed without chemical crosslinking reaction, the second layer is sprayed with a 1k transparent accelerator coating layer containing 0.5-1wt% drier without chemical crosslinking reaction, and the third layer is sprayed with chemical 2k varnish layer without driers for cross-linking reaction; 1k clear in this three-layer automotive topcoat composite coating promotes the migration of driers in the paint layer into the 2k varnish coating and contributes to the Rapid curing of the 2k varnish layer; the composite coating can be cured and polished after drying at room temperature for 1 hour, and the activation period of the 2k varnish used is not less than 6 hours, and the composit...

Embodiment 2

[0054] The fast-curing and long pot life automotive finish composite coating and preparation method thereof provided in this embodiment are basically the same as in Example 1, except that:

[0055] The 1K transparent accelerating paint is made of 20wt% main resin, 20.4wt% auxiliary resin, 55wt% solvent, 0.6wt% drier and 4wt% auxiliary agent.

[0056] The solvent therein is butyl acetate.

[0057] When the temperature is 8°C and the humidity is 50%RH, four methods are used for construction.

[0058] Method A: Spray 1k primer without chemical crosslinking reaction, surface dry for 10 minutes, spray 2k finish varnish with chemical crosslinking reaction without drier;

[0059] Method B: Spray a 1k primer without a chemical crosslinking reaction, let it dry for 10 minutes, and spray a 2k finish varnish with a chemical crosslinking reaction containing 0.6wt% drier;

[0060] Method C (i.e. the present invention): spray the 1k primer without chemical crosslinking reaction, surface d...

Embodiment 3

[0068] The fast curing and long pot life automotive finish composite coating provided by this embodiment and its preparation method are basically the same as those in Examples 1 and 2, except that:

[0069] The 1K transparent accelerating paint is made of 25wt% of main resin, 20wt% of auxiliary resin, 47wt% of solvent, 0.5wt% of drier and 7.5wt% of auxiliary agent.

[0070] The solvent is a mixture of ethyl 3-ethoxy propionate and methyl isobutyl ketone, prepared according to 50 wt% of each.

[0071] When the temperature is 25°C and the humidity is 40%RH, four methods are used for construction.

[0072] Method A: Spray a 1k primer without chemical crosslinking reaction, let it dry for 5 minutes, and then spray a 2k finish varnish with chemical crosslinking reaction without drier;

[0073] Method B: Spray a 1k primer without chemical crosslinking reaction, let it dry for 5 minutes, and spray a 2k finish varnish with chemical crosslinking reaction containing 1% drier;

[0074]...

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Abstract

The invention discloses an automobile finish paint composite coating capable of being rapidly cured and having long activation period. The automobile finish paint composite coating is a three-layer automobile finish paint composite coating, wherein a first layer is a 1k ground color paint layer which is sprayed without chemical crosslinking reaction, a second layer is a 1k transparent promoting coating layer which is sprayed without chemical crosslinking reaction and contains a drier, and a third layer is a 2k finishing varnish layer. The drier in the 1k transparent promoting coating layer ofthe three-layer automobile finish paint composite coating migrates to the 2k finishing varnish layer and promotes rapid curing of the 2k finishing varnish layer. The composite coating can be cured andpolished after being dried for 1 hour at normal temperature, the activation period of the 2k finishing varnish is not shorter than 6 hours, the composite coating does not need to be baked, and surface drying and hard drying can be completed at normal temperature. The invention further provides a preparation method of the automobile finish paint composite coating. The purposes of improving the surface drying and hard drying curing speed of the 2k finishing varnish layer and prolonging the activation period of the 2k finishing varnish can be achieved by synchronously improving the coating components and the preparation process.

Description

technical field [0001] The invention relates to the technical field of automotive coatings, in particular to an automotive topcoat composite coating capable of rapid curing and long activation period and a preparation method thereof. Background technique [0002] With the increase of my country's automobile production and sales year by year, the amount of automotive repair coatings is increasing, and the color of automobiles is becoming more and more abundant. The color of automobiles is provided by automobile topcoats. There are two types of automotive finishes. One is 2k solid color topcoat, which is composed of hydroxyl acrylic resin or polyester resin or a mixture of the two as the main material, together with various pigment solvent additives and other materials to form component A, and polyisocyanate curing agent as component B , During construction, component A and component B are mixed and stirred evenly in a certain proportion, and then adjusted to a spray viscosit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/04C09D201/00B05D3/02B05D3/12B05D7/00
CPCB05D3/0254B05D3/12B05D7/576B05D2451/00B05D2502/00C09D133/04C09D201/00C08L101/00C08L33/04
Inventor 罗晖李桂琴郭逍遥赖浩城郭伟杰刘其平
Owner QINGYUAN HAOYU CHEM TECH
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