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Method for forming multilayered coating film

A multi-layer coating, coating technology, applied in the direction of coatings, polyurea/polyurethane coatings, devices for coating liquids on surfaces, etc. Coating film and other problems in hardness and chipping resistance, to achieve the effect of excellent hardness and excellent chipping resistance

Inactive Publication Date: 2014-11-05
HONDA MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned method without intermediate coating cannot form an intermediate coating film with excellent smoothness and chipping resistance, so the obtained multilayer coating film has the problem of lowering smoothness and chipping resistance.

Method used

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  • Method for forming multilayered coating film
  • Method for forming multilayered coating film
  • Method for forming multilayered coating film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0156] The following examples are given to describe the present invention more specifically. It should be noted that the scope of the present invention is not limited to these examples. In addition, "part" and "%" in an Example represent "part by mass" and "% by mass", respectively.

[0157] Water-based 1st base coat paint (A):

[0158] Preparation of waterborne polyester resin (a)

preparation example 1

[0160] 193 parts of hexahydrophthalic anhydride, 208 parts of isophthalic acid, 183 parts of adipic acid, 376 parts of neopentyl glycol and 122 parts of trimethylolpropane, and the temperature was raised between 160°C and 230°C for 3 hours. Thereafter, condensation reaction was performed until the acid value became 3 mgKOH / g or less while maintaining the temperature at 230° C. while distilling off generated moisture with a water separator. Next, in order to add a carboxyl group to the obtained condensation reaction product, further add 30 parts of trimellitic anhydride, react at 170° C. for 30 minutes, cool to below 60° C., and add 0.9 equivalent of 2-( Dimethylamino)ethanol was slowly added to deionized water after neutralization, thereby obtaining a product having a hydroxyl value of 125 mgKOH / g, an acid value of 21 mgKOH / g, a number average molecular weight of 1,300, a solid content of 45%, and a pH of 7.5. Waterborne polyester resin (a1).

preparation example 2~7

[0162] The blending composition of the polybasic acid component (a-1) and the alcohol component (a-2) is shown in Table 1 below, except that, the same operation as in Preparation Example 1 was obtained to obtain the hydroxyl value shown in Table 1, Aqueous polyester resins (a2) to (a7) having an acid value and a solid content of number average molecular weight of 45% and pH 7.5. In addition, the water-based polyester resin (a6) was not evaluated after that because it was difficult to prepare a stable aqueous dispersion.

[0163]

[0164] Preparation of water-based acrylic resin (b)

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Abstract

The present invention provides a method for forming a multilayered coating film which comprises applying a first water-based base coating composition, thereafter applying a second water-based base coating composition without preheating the first water-based base coating composition, preheating the applied compositions, further applying a clear coating composition, and then curing the three layers, i.e., the films of the first water-based base coating composition, second water-based base coating composition, and clear coating composition, at the same time, wherein the first water-based base coating composition is a coating composition that contains a specific water-dispersible polyester resin, a specific water-dispersible acrylic resin, a water-dispersible urethane resin, and a melamine resin. With this method, it is possible to form a multilayered coating film that is excellent in terms of smoothness, reflected-image clarity, chipping resistance, and hardness.

Description

technical field [0001] The present invention relates to the following method: sequentially coating a water-based first base coat paint, a water-based second base coat paint and a clear paint on an object to be coated, and heating and curing the obtained three-layer multilayer coating film simultaneously. In the baking method, it is possible to form a multilayer coating film excellent in smoothness, image clarity, and chipping resistance by performing preheating (preheating) only once. Background technique [0002] As a method of forming a coating film on an automobile body, for example, the following method is widely used: After forming an electrodeposition coating film on the object to be coated, the process of "application of intermediate coating → sintering and curing → application of primer → transparent" is widely used. Coating coating → sintering curing" 3-coating 2-baking method to form a multi-layer coating film. [0003] In contrast, in recent years, from the viewp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/36
CPCB05D7/572B05D2508/00B05D2503/00B05D2401/20Y10T428/263C09D175/04
Inventor 小岛圭介青木孝昌小川刚志江川隆夫奥田修士网谷周子今井崇裕
Owner HONDA MOTOR CO LTD
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