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Aqueous resin dispersion and method for producing the same

A technology of water-based dispersion and water-based resin, which is applied in the field of water-based resin dispersion and its preparation, and can solve the problems of poor appearance of coating film and poor water resistance of coating film

Inactive Publication Date: 2004-04-28
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, conventional acrylic dispersions allow the paint to sag with vertical surfaces due to post-coating viscosity or structural viscosity due to insufficient alkali thickening properties, or allow deviations in aluminum positioning, which should Due to the vigorous movement of the paint after application, resulting in a rather poor appearance of the dried and cured coating film
In addition, conventional acrylic resin dispersions of sufficient viscosity and structural viscosity contain an excess of carboxylic acid, as a result of which the water resistance of the obtained coating film is rather poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] (production of core / shell emulsions)

[0095] 620 parts of water and 8 parts of Newcol 293 (NipponNyukazai Co., Ltd.) were added to an ordinary reactor equipped with a stirrer, thermometer, dropping funnel, condenser and nitrogen inlet for the production of acrylic resin, and Heat to 75°C. Add 20.5 parts of APS (ammonium persulfate) as a polymerization initiator, and add dropwise the monomer mixture (acid value of core resin (C): 3.7mgKOH / g, hydroxyl Value: 20mgKOH / g). While adding the monomer dropwise, 0.3 parts of APS dissolved in 50 parts of water was uniformly added dropwise until the monomer addition of the shell resin (S) in the later step was completed.

[0096] After the dropwise addition of the monomers was completed, the reaction was continued at 80° C. for 1 hour.

[0097] 120 parts of methyl methacrylate

[0098] 80 parts of n-butyl acrylate

[0099] 10 parts of 2-hydroxyethyl methacrylate

[0100] 1 part acrylic

[0101] Next, while keeping the react...

Embodiment 2 to 6

[0121] [Examples 2 to 6, Comparative Examples 1 to 6]

[0122] In Examples 2 to 6 and Comparative Examples 1 to 6, except that the monomer components of the core resin (C) and the shell resin (S) were changed as shown in Table 1 and Table 2, the same method as in Example 1 was followed. Each aqueous resin dispersion was prepared separately. The properties of each of the aqueous resin dispersions thus obtained were evaluated in the same manner as in Test Methods 1 to 3 in Example 1. In Tables 1 and 2, the acid value and the hydroxyl value were calculated from the amount of each polymerizable unsaturated monomer contained in the monomer mixture and expressed by rounding off at the decimal place.

[0123] The abbreviations of Tables 1 and 2 are indicated as follows.

[0124] MMA: methyl methacrylate

[0125] S: Styrene

[0126] BA: butyl acrylate

[0127] EA: ethyl acrylate

[0128] MAA: methacrylic acid

[0129] AA: Acrylic

[0130] HEMA: 2-Hydroxyethyl methacrylate

[...

Embodiment 2

[0136] Example 2 68 20 100 0 0 3 20 0 11 41

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PUM

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Abstract

The present invention provides an aqueous resin dispersion having a relatively low acid value and high viscosity and structural viscosity after alkali neutralization, and a method for producing the same. A core / shell-type aqueous resin dispersion comprising a core / shell-type resin including: a core part comprising a resin (C) having an acid value of not more than 20 and a hydroxyl group value of not more than 100 and being emulsion-polymerized from a polymerizable unsaturated monomer (c) containing neither acid group nor hydroxyl group, and optionally a hydroxyl group-containing polymerizable unsaturated monomer (b), and optionally an acid group-containing polymerizable unsaturated monomer (a), and a shell part comprising a resin (S) having an acid value of 30 to 150 and a hydroxyl group value of 10 to 100 and being emulsion-polymerized from the acid group-containing polymerizable unsaturated monomer (a), the hydroxyl group-containing polymerizable unsaturated monomer (b), and the polymerizable unsaturated monomer (c) containing neither acid group nor hydroxyl group.

Description

technical field [0001] The present invention relates to an aqueous resin dispersion having excellent thickening performance and structural viscosity and containing a synthetic resin emulsion which exhibits excellent curing performance. Background technique [0002] Among the various uses of synthetic resin emulsions, there are cases such as applying the electrostatic fiber implantation process of short fiber pile to various substrates such as ABS resin, polystyrene, polyvinyl chloride, polypropylene and fabrics, And synthetic resin emulsions are used in various automotive coatings such as primers and in construction or housing materials. The application of these synthetic resin emulsions requires excellent coating workability and coating properties when coating with various coating tools such as rolls, coating rods, sprayers, air spray electrostatic coaters (bells, etc.). Layer stability, and for the purpose of ensuring immediate sagging resistance to thick coatings after ...

Claims

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Application Information

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IPC IPC(8): C08F265/04C08F265/06C08F291/00
CPCC08F291/00C08F265/06C08F265/04C08F2/22C08J3/12
Inventor 築山文俊高胁浩一
Owner DAICEL CHEM IND LTD
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