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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 coating films, harm to human body and environment, and non-compliance with environmental protection requirements. Improve hardness and chemical medium resistance, increase crosslink density, and avoid adverse effects

Active Publication Date: 2014-06-18
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 Preparation of Waterborne Two-Component Polyurethane Coatings

[0027] The water-based two-component polyurethane coating is composed of two components, A and B. The coating group A is Bayhydur XP2655, a water-dispersed isocyanate produced by Bayer, Germany; the coating component B is composed of the following components. 2

[0028] Table 2

[0029]

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

[0031] Before use, mix evenly according to the mass ratio of component A: component B of 1:6.

[0032] Implementation 4 Preparation of water-based acrylic amino b...

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 after baking at 140 ± 2) °C for 20 minutes, and the properties were tested according to the relevant national standards for coatings, and 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 Slight discoloration

18d slight discoloration

Alkali resistance (10%NaOH), 10d

no change

no change

6d slight discoloration

7d slight discoloration

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 ...

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

Claims

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Application Information

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Patent Type & Authority Patents(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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