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Preparation method of automotive topcoat composite coating capable of being rapidly cured and long in activation period

A car topcoat, rapid curing technology, applied in coatings, devices for coating liquid on the surface, etc., can solve the problem that the car topcoat cannot be applied, the comprehensive requirements of construction technology and paint film performance cannot be met at the same time, and the pot life is short and other problems, to achieve the effect of strong practicability, prolonging the activation period and long activation period

Inactive Publication Date: 2020-06-19
QINGYUAN HAOYU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above patents are able to provide an automotive primer composition that cures rapidly at temperatures from 0°C to below 80°C and dries after only 15 to 45 minutes and can be sanded, but has a short pot life and is also It cannot be applied to automobile topcoats, and cannot meet the comprehensive requirements of construction technology and paint film performance at the same time

Method used

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  • Preparation method of automotive topcoat composite coating capable of being rapidly cured and long in activation period
  • Preparation method of automotive topcoat composite coating capable of being rapidly cured and long in activation period
  • Preparation method of automotive topcoat composite coating capable of being rapidly cured and long in activation period

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] At a temperature of 8°C and a humidity of 50%RH, a method for preparing a composite coating of an automotive topcoat that can be cured quickly and has a long pot life, comprises the following steps:

[0029] (1) Spray a 1k base coat on the surface of the car without chemical crosslinking reaction, and let it dry for 5-10 minutes to form a 1k base coat layer;

[0030] (2) Spraying a 1k transparent accelerator coating containing 0.5%-1wt% drier without chemical crosslinking reaction on the 1k base paint, and drying on the surface for 5-10 minutes to form a 1k transparent accelerator paint layer;

[0031] (3) Spray the 2k finish varnish that does not contain drier with chemical crosslinking reaction on described 1k transparent promotion paint, and the drier in described 1k transparent promotion paint is to 1k base color paint layer and 2k cover varnish. Osmotic migration in the varnish coating to form a 2k varnish layer and promote rapid curing of the varnish.

[0032] Th...

Embodiment 2

[0052] The preparation method and the coating thereof of the fast-curing and long pot life automotive topcoat composite coating provided in this embodiment, its basic steps are the same as those in Example 1, except that:

[0053] When the temperature is 25°C and the humidity is 40%RH, three methods are used for construction.

[0054] 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;

[0055] 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;

[0056] Method C: Spray 1k base paint without chemical crosslinking reaction, surface dry for 5 minutes, spray 1k transparent accelerator coating containing 1% drier without chemical crosslinking reaction, surface dry for 5 minutes, spray with chemical crosslinking Reactive 2k varn...

Embodiment 3

[0063] The preparation method and the coating thereof of the fast-curing and long pot life automotive topcoat composite coating provided in this embodiment, its basic steps are the same as those in Example 1, except that:

[0064] When the temperature is 35°C and the humidity is 30%RH, three methods are used for construction.

[0065] 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;

[0066] 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;

[0067] Method C: Spray 1k base paint without chemical crosslinking reaction, surface dry for 5 minutes, spray 1k transparent accelerator coating containing 1% drier without chemical crosslinking reaction, surface dry for 5 minutes, spray with chemical crosslinking Reactive 2k varn...

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Abstract

The invention discloses a preparation method of an automotive topcoat composite coating capable of being rapidly cured and long in activation period. The preparation method comprises the following steps that (1) 1k base paint free of a chemical crosslinking reaction is sprayed to the surface of an automobile, and the surface is dried for 5-10 min; (2) 1k transparent promotion coating free of a chemical crosslinking reaction and including 0.5%-1% of a dryer is sprayed on the 1k base paint, and the surface is dried for 5-10 min; and (3) 2k coating varnish is sprayed, the dryer in the 1k transparent promotion coating is migrated into the 2k coating varnish, a 2k coating varnish layer is formed, and rapid curing of the coating varnish is promoted. The invention further provides the automotivetopcoat composite coating prepared through the method. The automotive topcoat composite coating achieves the technical aims that the drying speed of the 2k coating varnish can be increased and the activation period of the 2k coating varnish can be prolonged. By means of the automotive topcoat composite coating and the preparation method thereof, baking is not needed, equipment does not need to bemodified or added, additional operation training is not needed, and practicality is high.

Description

technical field [0001] The invention relates to the technical field of automobile paints, in particular to a method for preparing an automobile topcoat composite coating capable of rapid curing and long pot life. 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 pigments, solvents, additives and other materials to form component A, and polyisocyanate curing agent as component B Components, during construction, component A and component B are mixed and stirred evenly in a certain proportion, then adjusted to spray viscosity with diluen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/38
CPCB05D7/56B05D1/38B05D2502/00B05D2401/10B05D2420/02
Inventor 罗晖汤汉良李桂琴陈之善郭伟杰郭逍遥赖浩城
Owner QINGYUAN HAOYU CHEM TECH
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