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Waterborne dispersion resin containing hydroxyl and preparation method thereof

A water-based dispersion and resin technology, applied in coatings, polyurea/polyurethane coatings, etc., can solve the problems of insignificant improvement in water resistance and chemical medium resistance of the coating film, failure to meet environmental protection requirements, human body and environmental hazards, etc., to achieve Improve hardness and chemical medium resistance, avoid adverse effects, and increase crosslinking density

Active Publication Date: 2012-10-17
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with conventional small-molecular-weight dispersants, these high-molecular water-based dispersants improve the gloss and fullness of the coating film, but still only a small amount of dispersant participates in the curing crosslinking reaction. Median improvement is not obvious
Chinese patent CN101357308A discloses a dispersant, which contains hydroxyl functional groups in its molecules, which can participate in chemical crosslinking reactions and improve the chemical medium resistance of the coating film. The preparation process is complicated, and a large amount of organic solvents cause harm to the human body and the environment during production, which does not meet environmental protection requirements

Method used

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  • Waterborne dispersion resin containing hydroxyl and preparation method thereof
  • Waterborne dispersion resin containing hydroxyl and preparation method thereof
  • Waterborne dispersion resin containing hydroxyl and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0026] Implementation 3 prepares waterborne two-component polyurethane coating

[0027] The water-based two-component polyurethane coating consists of two components, A and B. The first component of the coating is the water-dispersible isocyanate Bayhydur XP2655 produced by Bayer in Germany; the second component of the coating is composed of the following components. The components and their dosage are shown in the table 2

[0028] Table 2

[0029]

[0030] Preparation method: Mix water, pigment dispersant, titanium dioxide, and defoamer evenly, grind and disperse with a sand mill until the fineness is ≤25 μm, and prepare the color paste. Add acrylic acid hydroxyl dispersion and bactericide to the color paste prepared above and stir evenly, slowly add thickener under stirring condition, after stirring evenly, use 120 mesh silk screen to filter out impurities to obtain the second component of the coating .

[0031] Before use, mix uniformly according to the mass ratio of ...

Embodiment 4

[0052] The coatings prepared in Example 4 and Comparative Example 2 were directly coated on the samples; the baking conditions of the samples were baked at 140±2)°C for 20 minutes, and then the various properties were tested according to the relevant national paint standards. The results are shown in Table 4;

[0053] Table 4

[0054] Test items

Example 3

Example 4

Comparative example 1

Comparative example 2

Gloss (60°)

83

80

52

70

pencil hardness

4H

3H

3H

2H

Water resistance, 30d

no change

no change

16d slightly discolored

18d slightly discolored

Alkali resistance (10%NaOH), 10d

no change

no change

6d slightly discolored

7d slightly discolored

Acid resistance (10%H2SO4), 48h

No abnormality

No abnormality

24h foaming

24h foaming

Resistant to 120# gasoline, 7d

no change

no change

no change

no change

...

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Abstract

The invention relates to a waterborne dispersion resin containing hydroxyl and a preparation method thereof. The resin is characterized in that the resin is obtained by free radical polymerization of various vinyl monomers in water under the action of initiators to form a copolymer and then neutralizing the copolymer to form salt; hydroxyl accounts for 3.0-4.0% of the total mass of the resin; the mass percent of the medium water is 70-74%; the mass percent of neutralizers is 3.0-4.0%; the total mass percent of various vinyl monomers is 24-26%; the initiators account for 2.2-2.6% of the total mass of various vinyl monomers; and various vinyl monomers are formed by 60-80% of vinyl monomers without functional groups, 15-35% of vinyl monomers containing the hydroxyl functional group and 8-15% of vinyl monomers containing the carboxyl functional group. The resin is especially suitable to be used in the waterborne cross-linkable coating systems with waterborne hydroxyl dispersions or hydroxyl emulsion as the main film forming matters to disperse pigments and fillers and can obviously improve such performances of the films as gloss, water resistance and chemical media resistance.

Description

technical field [0001] The invention relates to a hydroxyl-containing water-based dispersion resin and a preparation method thereof, which is especially suitable for dispersing pigments and fillers in water-based cross-linkable coating systems whose main film-forming substances are water-based hydroxyl dispersions or hydroxyl emulsions. Background technique [0002] With the improvement of people's awareness of environmental protection, water-based coatings have been developed rapidly, especially the water-based cross-linkable coating system with water-based hydroxyl dispersion or hydroxyl emulsion as the main film-forming substance has developed rapidly. The overall performance of the coating film is much better than that of thermoplastic water-based coatings formed by physical drying. Like other water-based coating systems, due to the poor dispersibility of water-based hydroxyl dispersions or hydroxyl emulsions on pigments and fillers, water-based dispersants must be used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/28C08F220/06C08F212/08C08F220/14C09D175/04C09D133/08
Inventor 孔志元史立平何庆迪蔡青青
Owner CHINA NAT OFFSHORE OIL CORP
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