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Aqueous paint composition

A technology of water-based coatings and compositions, applied in the direction of polyurea/polyurethane coatings, coatings, latex paints, etc., to achieve excellent mechanical and physical properties

Active Publication Date: 2019-02-05
KCC CORP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the intermediate coat / clear coat omission type coating project has excellent economical and environmental protection as mentioned above, but it cannot fully utilize the hand-selected problem, that is, the protection of the electrophoretic coating film against ultraviolet rays (the function of the intermediate coat), ensuring physical properties and Function of appearance quality (function of varnish)

Method used

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  • Aqueous paint composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 3 and comparative example 1 to 2

[0070] Embodiment 1 to 3 and comparative example 1 to 2: the making of aqueous coating composition

[0071] The components were sequentially mixed in the order shown in Table 1 below, and the final viscosity was set at 55 seconds in a No. 4 Ford cup to prepare water-based paint compositions of Examples and Comparative Examples.

[0072] 【Table 1】

[0073] Element

Example 1

Example 2

Example 3

Comparative example 1

Comparative example 2

distilled water

11.29

11.29

11.29

11.29

11.29

Cosolvent 1

3.15

3.15

3.15

3.15

3.15

Dispersant

1.46

1.46

1.46

1.46

1.46

Defoamer

0.94

0.94

0.94

0.94

0.94

Lactone-modified water-soluble acrylic resin

13.12

13.12

13.12

-

13.12

Water Soluble Acrylic Resin

-

-

-

13.12

-

TiO 2 pigment

13.84

13.84

13.84

13.84

13.84

Acrylic Latex Resin

36.61

36.61

36.61

...

experiment example

[0091] Experimental example: Appearance and physical property evaluation

[0092] On the surface of the electrophoretic surface coated on the substrate, the water-based coating composition of each example and comparative example was used as a primer (dried coating film thickness: 25 μm to 70 μm) for spin handle coating, and at 80 ° C, hot air was blown for 3 minutes to evaporate the remaining water in the paint. Then, it is cured at 140° C. to 150° C. for 20 to 30 minutes in a common drying oven to form a final coating film. The appearance and physical properties of the final coating film were measured and evaluated according to the following methods, and the results are shown in Table 2 below.

[0093] (1) Coating operability

[0094] According to the spraying state and the degree of wetting of the base material when the paint is sprayed, it is rated as excellent, good, fair, and poor.

[0095] (2) Appearance of coating film

[0096] The final CF value was measured using ...

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Abstract

The present invention can provide an aqueous paint composition comprising an acrylic emulsion resin, a lactone-modified water-soluble acrylic resin, a water-soluble polyester resin, a curing agent, and water, wherein the curing agent comprises a block isocyanate and a melamine resin.

Description

technical field [0001] The invention relates to a water-based paint composition, in particular to a water-based paint composition capable of ensuring the physical properties and appearance quality of a coating film even if a mid-coat and a varnish are omitted. Background technique [0002] Generally, the automotive coating system uses 3-coating and 2-baking (3Coat2Bake). The above-mentioned three-coating and two-baking refers to coating the electrophoretic coating on the car body, and after the intermediate coating is applied on the top, it is cured at 140°C to 150°C for 20 to 30 minutes, and the upper layer is continuously applied on it. Paint (Top Base Coat) and upper layer varnish (Top Clear Coat), and then dry at 140°C to 150°C for 20 to 30 minutes, is the most commonly used automotive coating system. [0003] However, in order to protect the electrophoretic coating film from ultraviolet rays, the use of intermediate coating is indispensable, so that only the cost of mu...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/02C09D175/06C09D175/14C08L79/04
CPCC08L33/08C08L79/04C09D5/02C09D175/04C09D175/06C09D175/14
Inventor 曹洙英洪承民金成晙朴度彦韩相民
Owner KCC CORP CO LTD
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