Aqueous coating composition and method for producing aqueous coating composition

A technology of water-based coatings and compositions, applied in polyester coatings, polyurea/polyurethane coatings, devices for coating liquids on surfaces, etc., can solve problems such as poor appearance of coating films, and achieve good coating workability

Active Publication Date: 2021-02-02
นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the first coating composition and the second coating composition are applied wet-on-wet, there is a problem that the coating compositions are mixed (mixed) between the layers of the two uncured coating films. layer), the disadvantage of poor appearance of the coating film

Method used

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  • Aqueous coating composition and method for producing aqueous coating composition
  • Aqueous coating composition and method for producing aqueous coating composition
  • Aqueous coating composition and method for producing aqueous coating composition

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0084] As a preferred mode of preparing the core part, for example, the following mode can be cited: the core part preparation monomer (a-1) contains a hydroxyl group-containing polymerizable monomer and an acid anhydride group-containing polymerizable monomer, and in the core part In the preparation of the monomer (a-1), after polymerizing monomers other than the acid anhydride group-containing polymerizable monomer, the hydroxyl group of the obtained polymer is reacted with the acid anhydride group of the acid anhydride group-containing polymerizable monomer, and the A polymerizable group is introduced into a polymer. Thereby, there is an advantage that a polymerizable group forming a graft portion at the time of shell polymerization can be introduced into the core portion.

[0085] Next, the shell portion preparation monomer (a-2) containing an acid group-containing polymerizable monomer is solution-polymerized in the presence of the core portion obtained above, thereby for...

manufacture example 1

[0175] Production example 1 Production of acrylic resin dispersion (1)

[0176] Preparation process 1

[0177] 210 mass parts of butyl acetates were put into the reactor equipped with a stirring, cooling, and heating apparatus, and it heated to 120 degreeC. Then, 73.65 parts by mass of styrene (ST), 178.96 parts by mass of methyl methacrylate (MMA), 75.94 parts by mass of n-butyl acrylate (BA), 64.45 parts by mass of 2-ethylhexyl acrylate, For a monomer mixture of 105.00 parts by mass of ethyl ester (HEMA), 2.0 parts by mass of acrylic acid (AA), and 70 parts by mass of tert-butyl peroxy-2-ethylhexanoate dissolved in 45 parts by mass of butyl acetate 90 minutes to 2 systems isochronous dropwise. 10 parts by mass of methacrylic anhydride was added while maintaining the reaction container at 120° C., and maintained for 2 hours. Then, it cooled to 60 degreeC, and obtained the core polymer (core part).

[0178] Preparation process 2

[0179]Next, 210 mass parts of butyl...

manufacture example 2～11（6～11

[0186] Production examples 2 to 11 (6 to 11 are comparative production examples) Production of acrylic resin dispersion (A) (2) to (11)

[0187] Except having changed the charging amount of each raw material into the value described in Table 1, it carried out similarly to Example 1, and produced the acrylic resin dispersion (A)(2)-(11).

[0188] Production Example 12 (Comparative Production Example) Production of a single-layer acrylic resin dispersion (12)

[0189] 466 parts by mass of butyl acetate was placed in a reactor equipped with a cooling and heating device, and heated to 120°C. Then, 50.00 parts by mass of styrene (ST), 298.61 parts by mass of methyl methacrylate (MMA), 225.01 parts by mass of n-butyl acrylate (BA), and 155.86 parts by mass of 2-ethylhexyl acrylate (2-EHA) , a monomer mixture of 231.98 parts by mass of hydroxyethyl methacrylate (HEMA), 38.53 parts by mass of acrylic acid (AA), and 15 parts by mass of tert-butyl peroxy-2-ethylhexanoate dissolved ...

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Abstract

The purpose of the present invention is to provide an aqueous coating composition which is suppressed in viscosity change even in cases where the amount of a solvent contained in the aqueous coating composition is reduced due to changes in the coating environment, and which is capable of forming a coating film that has excellent coating film appearance. The present invention provides an aqueous coating composition which contains an acrylic resin dispersion (A) and a melamine resin (B), and which is configured such that: the acrylic resin dispersion (A) has a core / shell structure; the acrylic resin dispersion (A) is a dispersion of a solution polymerization product of a core part preparation monomer (a-1) and a shell part preparation monomer (a-2); the shell part preparation monomer (a-2) contains an acid group-containing polymerizable monomer; the mass ratio of the core part to the shell part of the acrylic resin dispersion (A), namely (core part) / (shell part) is within the range from30 / 70 to 70 / 30; the shell part of the acrylic resin dispersion (A) has acid groups; the neutralization rate of the acid groups in the shell part is 50% or more; the weight average molecular weight ofthe acrylic resin dispersion (A) is within the range from 10000 to 70000; the core part preparation monomer (a-1) has an acid value of 10 mgKOH / g or less; the shell part preparation monomer (a-2) hasan acid value of from 10 mgKOH / g to 70 mgKOH / g (inclusive); the whole monomer mixture that contains the core part preparation monomer (a-1) and the shell part preparation monomer (a-2) has an acid value of from 10 mgKOH / g to 30 mgKOH / g (inclusive); the acrylic resin dispersion (A) has a glass transition temperature within the range from -10 DEG C to 60 DEG C; and the melamine resin (B) contains ahydrophobic melamine resin.

Description

technical field [0001] The present invention relates to a water-based paint composition and a method for producing the water-based paint composition. Background technique [0002] A water-based paint composition is a paint composition containing a water-based solvent. Generally speaking, such aqueous coating compositions tend to affect the volatilization speed of the solvent due to changes in the coating environment such as the temperature and humidity of the coating. Furthermore, the appearance and / or physical properties of the coating film formed by coating may also change due to a change in the volatilization rate of the solvent. [0003] As an example of coping with such a change in the coating environment, there is, for example, a method of adjusting the volatilization rate of the solvent by adjusting the amount of the solvent contained in the aqueous coating composition. For example, JP-A-2008-302274 (Patent Document 1) describes a method of determining a coating NV ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/02B05D1/36B05D7/24C09D5/02C09D161/28C09D167/00C09D175/04
CPCC09D5/02C09D161/28C09D133/12C09D151/06C08F220/14C08G63/127C08G18/755C08G18/348C08G18/44C08G18/246C08G18/3231C08G18/12C09D175/06B05D7/572B05D2202/10C08F265/06C08L61/28C08L67/00C08L75/00C08F212/08C08F220/06C08F220/1804C08F220/20C08L75/06C08F220/1808C08L33/12C08L67/02C08L75/04C08L51/06B05D2420/01B05D2420/02B05D2420/03C08F2/06C08K5/34922C08L2201/50C08L2207/53C09D133/08C09D167/00C09D175/04
Inventor 关根一基藤本宏美松嶋美佳大邻雅俊S·齐藤冈田拓磨中元圆理
Owner นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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