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Water-based single-component paint and multilayer film forming method

A single-component coating and single-based technology, which is applied in coatings, polyurea/polyurethane coatings, thin material treatment, etc., can solve the problem of reducing the concentration of adhesion on the surface of the coating film, reducing the compatibility of compounds and base resins, and damaging Appearance and other problems, to achieve excellent surface smoothness of coating film, improved adhesion of recoating, excellent hardness and acid resistance

Inactive Publication Date: 2008-09-10
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the introduction of hydroxyl groups into blocked polyisocyanates is achieved by reacting with isocyanate groups, the concentration of isocyanate groups in the resulting blocked polyisocyanate compounds decreases, and as a result, the curability decreases.
Moreover, there is still another problem: due to the high polarity of the compound, the compatibility of the compound with the base resin is reduced, thereby impairing the appearance
Another problem with incomplete removal is that sufficient curability cannot be achieved, resulting in unsatisfactory film properties
Moreover, in the surface layer of the coating film where the end-blocking agent is easy to remove and volatilize, the reaction proceeds faster than in the layer, which reduces the adhesion of the coating film surface - the concentration of the participating functional groups, and, when the cured coating film When another layer of finish paint is applied on the surface, the bondability of the surface to the upper coating film becomes insufficient

Method used

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  • Water-based single-component paint and multilayer film forming method
  • Water-based single-component paint and multilayer film forming method
  • Water-based single-component paint and multilayer film forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175] In a 4-neck flask equipped with heater equipment, a stirrer, a thermometer and a reflux condenser, 30 parts of propylene glycol monopropyl ether were charged, and then the temperature inside the flask was raised to 145° C. under a stream of nitrogen. The nitrogen supply was stopped and, as a first stage, 15 parts of styrene, 10 parts of n-butyl acrylate, 18 parts of isobutyl methacrylate, 13 parts of 4-hydroxybutyl acrylate, 12 1 part PLACCEL FA-2, 7 parts 2-hydroxyethyl methacrylate and 3.0 parts di-tert-butyl peroxide. The reaction system was kept at the same temperature for another 30 min. Then, as the second stage, 6 parts of isobutyl methacrylate, 6 parts of 4-hydroxybutyl acrylate, 6 parts of PLACCEL FA-2, 3 parts of 2-hydroxyethyl methacrylate, 4 parts part of acrylic acid and 1.0 part of di-tert-butyl peroxide, and then aged at the same temperature for 1 h. Then, the solvent was distilled off under reduced pressure until the solids concentration rose to at lea...

Embodiment 2～15

[0177] Using the starting materials shown in Table 1, acrylic resins (A-2) to (A-15) were obtained in a similar manner to Production Example 1.

[0178] Table 1 shows the composition of the starting materials, the solid content and properties of the acrylic resins (A-1) to (A-15).

[0179]

[0180] Preparation of blocked polyisocyanate compound (B)

Embodiment 16

[0182] Put 250 parts of SUMIDUR N3300 into a 4-neck flask equipped with stirrer, heating device, cooling device and pressure reducer (注1) And 125 parts of methyl ethyl ketone, and heated to 30 ° C. Then, 126 parts of 3,5-dimethylpyrazole were gradually added within 2 hours while stirring, and the reaction mixture was reacted at 30°C under stirring until no free isocyanate groups were detected with an infrared spectrophotometer. After the end of the reaction, a solution of a blocked polyisocyanate compound (B-1) having a solid content of 70% was obtained. The resulting blocked polyisocyanate compound (B-1) had an SP measurement of 9.33, an NCO content of 14.4% and a number average molecular weight of 1,000. In the present specification, "NCO content" refers to the NCO group amount (%) per 100 parts by mass of the solid content of the resin.

[0183] (Note 1) SUMIDUR N3300: trade name, Sumika Bayer Urethane Co., Ltd., hexamethylene diisocyanate.

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Abstract

The invention provides water-based one package coat comprising acrylic resin having specific long chain primary hydroxyl-containing side chains as crosslinking functional groups and a solubility parameter of 9.30-11.20, and blocked polyisocyanate compound having a solubility parameter of 9.00-11.50, the difference DeltaSP between the solubility parameter (SP1) of the acrylic resin and the solubility parameter (SP2) of the blocked polyisocyanate compound (DeltaSP=(SP1)-(SP2)) being within a range of from -0.80 to 1.50.

Description

technical field [0001] The present invention relates to a water-based one-component paint excellent in curability, coating film properties, coating surface smoothness and water dispersion stability and a method of forming a multilayer coating film using the water-based one-component paint. Background technique [0002] Recently, environmental issues on a global scale have drawn great attention. In the automotive industry, we have also taken the lead in researching countermeasures against environmental problems in the manufacturing process. The steps involved in car manufacturing contribute to issues such as global warming, generation of industrial waste, and emission of volatile organic compounds (VOC). In particular, most VOCs are emitted during the coating step, so there is an urgent need to reduce VOCs. [0003] The skin part of the car body is generally coated with a multi-layer coating film, which is composed of a cationic electrophoretic primer film, an intermediate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/14C09D5/00B05D1/36
CPCB05D7/14B05D7/532C08F212/08C08K5/29C08K5/54C08K5/56C09D5/02C09D133/14Y10T428/31855C08F220/281C08F220/1804C09D133/066C09D175/04
Inventor 野口隆安达尚人
Owner KANSAI PAINT CO LTD
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