Curable coating composition and coating film forming method

a coating composition and film forming technology, applied in the direction of liquid surface applicators, coatings, transportation and packaging, etc., can solve the problems of deteriorating durability performance such as weather resistance, difficult to achieve sufficient crosslinking density by michael reaction, and prone to sagging

Inactive Publication Date: 2002-12-12
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the resin component in the coating is rendered to have low polarity or low molecular weight, there arises a workability problem such that sagging tends to occur when it is coated on a vertical surface, for example.
However, the .alpha.,.beta.-unsaturated carbonyl group and the active methylene group are tend to be comparatively affected by steric hindrance; therefore, sufficient crosslinking density is hard to be attained by a Michael reaction only.
Moreover, since the .alpha.,.beta.-unsaturated carbonyl group is highly reactive, the group, if being remained in a coating film, tends to deteriorate durability performance such as weather resistance.
In addition, the super high solid coating has not reached to a satisfactorily sufficient level in terms of workability such as sagging property.
If the number average molecular weight is less than 300, a hardness of the resulting coating film may become low and curability of the coating may be insufficient, thereby solvent resistance, water resistance and weather resistance of the coating film may possibly deteriorate.
On the other hand, if it exceeds 10,000, a viscosity of the component (a) itself becomes high, thereby a content of an organic solvent in the diluted coating upon application may be excessive.
If the above active hydrogen equivalent is less than 40, compatibility with other components described hereinafter may decrease and the resulting coating film may possibly be hard and brittle.
On the other hand, if it exceeds 2,000, the crosslinking density of the resulting coating film becomes small, thereby physical properties and performance of the coating film may possibly deteriorate.
If the above number average molecular weight is less than 200, the composition is evaporated...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

production example 9

[0113] Production Example 9 Preparation of Pigment Paste

[0114] After 100 parts of the water-borne acrylic resin obtained in Production Example 8, 28.9 parts of ion exchange water, 0.3 part of dimethylaminoethanol, and 5.1 parts of Degussa carbon FW-285 (carbon black made by Degussa AG) were preliminarily mixed, the mixture was dispersed in a paint conditioner with glass beads added thereto at room temperature for 1 hour to obtain a pigment paste having a particle size of 5 .mu.m or less.

[0115] Production Example 10 Preparation of Water-Borne Base Coating

[0116] A water-borne base coating was obtained by mixing 118.8 parts of the water-borne acrylic resin obtained in Production Example 8, 134.3parts of the pigment paste obtained in Production Example 9, 29.1 parts of Cymel 204 (melamine resin made by Mitsui Cytec K.K., solid content 80% by weight) and 161.3 parts of ion exchange water.

example 1

[0117] Example 1

[0118] An additive solution was obtained by mixing 2 parts of Chinubin 384 (ultraviolet absorber made by Ciba Geigy Co. Ltd.), 4 parts of Sanol LS-292 (optical stabilizer made by Sankyo K.K.), 2 parts of an acrylic surface adjusting agent made by Nippon Paint Co., Ltd. (solid content 50% by weight) and 10 parts of an organic fine particles made by Nippon Paint Co., Ltd. (solid content 25% by weight).

[0119] In a disper, 154 parts of the acrylic resin (a-1) solution obtained in Production Example 1, 60 parts of pentaerithritol triacrylate, 2.3 parts of tetrabutylammonium acetate and 4.9 parts of Ilgacure 1700 (photo-polymerization initiator made by Ciba Specialty Chemicals Co.) were stirred and mixed until uniformly mixed, and thereafter, the additive solution obtained was added to the mixture and stirred to obtain a curable coating composition. Thus-obtained curable coating composition was diluted with n-butyl acetate so as to attain a viscosity of 30 sec with No. 4 F...

examples 2 to 9

[0124] Examples 2 to 9

[0125] According to compositions shown in Table 1, curable coatings were prepared in a manner similar to Example 1 and free films and test panels were further obtained.

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Abstract

The present invention is to provide a curable coating composition having much less of a volatile organic component, and being excellent in coating film performance such as durability and scratch resistance, and a coating film forming method using the above curable coating composition capable of suppressing generation of sagging and so on. The present invention is a curable coating composition which comprises (a) a component having an active methylene group and/or an active methine group, (b) a component having a methacrylate group and/or an acrylate group, (c) a Michael reaction catalyst and (d) a photo-polymerization initiator. The present invention also provides a coating film forming method which comprises a step (1) of applying a curable coating on a substrate to be coated and a step (2) including a stage of irradiating with ultraviolet ray and a stage of heating, said curable coating comprising the above curable coating composition.

Description

[0001] The present invention relates to a curable coating composition suitable as a top coating for an automotive and a coating film forming method using the same.PRIOR ART[0002] Recently, reduction of a volatile organic component (VOC) content in coatings, namely a super high solid coating, is strongly demanded in light of environmental issues. In this case, it is usually necessary to decrease a viscosity of a resin contained in a coating and for this reason, the method has been adopted in which a resin component in the coating is rendered to have low polarity or low molecular weight. However, when the resin component in the coating is rendered to have low polarity or low molecular weight, there arises a workability problem such that sagging tends to occur when it is coated on a vertical surface, for example.[0003] Moreover, improved durability of a coating film such as acid rain resistance and scratch resistance is further demanded, leading to a requirement for a curable system fo...

Claims

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Application Information

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IPC IPC(8): B05D3/06B05D7/24C08F8/00C08F299/00C09D4/02C09D5/00C09D201/02
CPCC08F299/00C08F2800/20C08F2810/20C08F2810/30C08F8/14C08F2220/283C08F8/10C08F220/06Y10T428/31938C08F220/283
Inventor KANAKURA, AKIHIROIRIE, TAKASHIYONEDA, HIROTOTANABE, HISAKI
Owner NIPPON PAINT CO LTD
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