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waterborne topcoat composition

A water-based topcoat and composition technology, applied in the direction of coating, can solve the problems of application limitation and insufficient mechanical properties of the coating film, and achieve the effects of excellent water resistance, excellent cold crack resistance and cost saving.

Active Publication Date: 2022-07-05
KCC CORP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although there are paints for repairing automobiles and compositions for painting parts that can be used under low-temperature firing conditions, especially heat-curing conditions at or below 120°C as in Patent Document 1 conventional topcoat composition, but the mechanical properties of the formed coating film are insufficient, and the application as a coating for car body is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to Embodiment 10 and comparative example 1 to comparative example 5

[0074] Preparation of topcoat compositions

[0075] The topcoat compositions were prepared by stirring and mixing the components in the compositions described in Tables 1 and 2 below such that the viscosity at 25°C became 55 seconds based on a No. 4 Ford Cup.

[0076] [Table 1]

[0077]

[0078] [Table 2]

[0079]

[0080] Hereinafter, the manufacturers and product names of the components used in the Examples and Comparative Examples are shown in Table 3 below.

[0081] [table 3]

[0082]

[0083]

experiment example

[0084] Experimental Example: Evaluation of Properties of Formed Coating Films

[0085] On the samples, a paint for primer coating (manufacturer: KCC, product name: FU2290) was applied and dried to form a primer coating film, and each of the topcoat compositions of Examples and Comparative Examples was uniformly performed bell spray, to a thickness of 15 μm. Then, the remaining water in the paint was evaporated (dried) by blowing air at 80°C for 3 minutes. On the topcoat, a low temperature curable clear coat (manufacturer: KCC) was applied to a thickness of 40 μm and cured in an oven at 100° C. for 25 minutes to form a final coating film. The appearance characteristics and physical properties of the final coating film were measured by the following methods, and the results are shown in Table 4.

[0086] (1) Coating workability

[0087] The coating workability was evaluated by the spraying state of the composition during bell spraying of the topcoat composition, and the spr...

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Abstract

The present invention relates to an aqueous topcoat composition comprising an acrylic resin, a polyurethane dispersion resin, an acrylic urethane dispersion resin, a urethane resin, a melamine-based curing agent, and an oxazoline-based curing agent.

Description

technical field [0001] The present invention relates to aqueous topcoat compositions. Background technique [0002] Generally, the outer panel of the vehicle body is required to prevent deterioration and rust of the paint film, and to have durability to maintain the gloss or color of the paint film. Therefore, the painting process of the car is usually carried out by electroplating the car body that has undergone a pretreatment process, that is, primer painting for improving adhesion and smoothness, and the appearance of the car body. The topcoat of the car body that has undergone primer coating. Thereafter, the clearcoat film is generally applied to protect the color of the topcoat film and to improve the appearance of the topcoat film, and to protect the topcoat film from external influences. [0003] The application of the topcoat and the application of the clearcoat is generally carried out by applying and drying the topcoat composition, applying the clearcoat composit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/00C08L75/04C08L75/14C09D7/63
CPCC08L75/14C09D7/63C08L75/04C09D133/00
Inventor 金孟岐郑善化崔明基邢宇粲文晟僖金昌赫
Owner KCC CORP CO LTD