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Composition for producing waterborne coating and coating system prepared from composition

A water-based coating and composition technology, which is applied in the field of producing water-based coating compositions, can solve the problems of inability to use a double-coating system, poor paint film compactness, and poor anti-corrosion performance.

Active Publication Date: 2018-05-15
WANHUA CHEMICAL (NINGBO) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary water-based acrylic topcoats cannot be used in the double-coat system of water-based containers due to their poor anti-corrosion properties
Water-based hydroxyacrylic dispersions cannot be used in water-based container double-coating systems due to poor workability and slow drying speed of thick coatings
[0004] Patent No. CN 103805029 B discloses a water-based anti-corrosion coating for the inner surface of containers and its production method. It uses water-based acrylic modified epoxy resin as the base material, and the resin has poor weather resistance and cannot be used for the outer coating of containers.
Patent No. CN102618159 B discloses a water-based polyurethane anti-corrosion coating for containers and its preparation method. It uses a single-component polyurethane dispersion and a single-component acrylic emulsion. Due to the characteristics of the two stacked and formed films, the paint film has poor compactness and is difficult to Achieves high corrosion resistance, cannot be used in two-coat systems

Method used

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  • Composition for producing waterborne coating and coating system prepared from composition
  • Composition for producing waterborne coating and coating system prepared from composition
  • Composition for producing waterborne coating and coating system prepared from composition

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preparation example Construction

[0041] Preparation of the base material to be coated: sandblasting and derusting the surface of the base material, and the derusting level reaches the Sa2.5 level specified in GB / T8923.

[0042] On the substrate to be coated, a double-coat system is prepared by high-pressure airless spraying construction technology, water-based epoxy zinc-rich primer (zinc powder content ≥ 80wt%, derived from Megaborne 116), the dry film thickness of the paint film is 30 μm, and it is self-drying 3~5min, then baked at 70-80℃ for 20-30min to obtain; the topcoat layer, evenly sprayed on the primer layer, the dry film thickness of the paint film is 40-50μm, dry for 5~10min, then baked at 70-80℃ 20-30min to get.

[0043] Unless otherwise specified, the reagents used in the present invention are analytically pure.

[0044] The embodiment selects the hydroxyacrylic acid emulsion to be Wanhua chemical 0676 and Luhydran S 938T; Hydroxy acrylic dispersions are from Wanhua Chemical 2033 and Bayer's...

Embodiment 1

[0051] A component, comprising the following components by weight: hydroxyacrylic acid emulsion ( 0676) 45 parts, hydroxyacrylic acid dispersion ( 2033) 15 parts, 3 parts of film-forming aid lauryl alcohol ester, 2 parts of titanium dioxide (Dragon Mang R-996), 3 parts of phthalocyanine blue (Shenzhen Mingyuan Chemical Pigment Co., Ltd.) talcum powder (800 mesh Guangxi Osmanthus brand ) 8 parts, barium sulfate (1250 mesh Qingdao Linke Chemical) 10 parts, dispersant BYK-190 1 part, wetting agent BYK-346 0.5 part, defoamer Tego 1488 0.3 part, neutralizer AMP-95 0.1 part , thickener U604 0.3 parts, antifungal agent KF-88 0.1 parts, deionized water 11.7 parts.

[0052] Preparation method:

[0053] (a) Add 90% of the formula amount of water into the condensed water dispersing tank, and then add water-based hydroxyacrylic acid dispersion, neutralizer, dispersant, wetting agent, and 50% formula amount of defoamer at a rate of 1000r / min pre-dispersion 15min.

[0054] (b) Add pi...

Embodiment 2

[0063] A component, comprising the following components by weight: hydroxyacrylic acid emulsion ( 0676) 30 parts, hydroxyacrylic acid dispersion ( 2033) 30 parts, 3 parts of film-forming aid dipropylene glycol butyl ether, iron oxide red (Bayferrox 4130) 5 parts, talcum powder (800 mesh Guangxi osmanthus brand) 8 parts, mica powder (800 mesh Chuzhou Sericite Factory) 2 5 parts of heavy calcium carbonate (800 mesh Changzhou Calcium Carbonate Co., Ltd.), 1 part of dispersant BYK-190, 0.5 part of wetting agent Tego wet270, 0.2 part of defoamer Tego 1488, 0.1 part of neutralizing agent AMP-95 , thickener U605 0.2 parts, antifungal agent KF-88 0.1 parts, deionized water 14.9 parts.

[0064] B component, comprising the following components by weight: water-based isocyanate curing agent ( 268) 70 parts, 30 parts of propylene glycol methyl ether acetate.

[0065] Prepare with embodiment 1.

[0066] Mix component A and component B according to the ratio of A:B=9:1 to obtain a co...

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Abstract

The invention discloses a composition for producing a waterborne coating. The composition comprises a component A and a component B, wherein the component A comprises a waterborne hydroxyl acrylic emulsion and a waterborne hydroxyl acrylic dispersion, and the component B comprises a waterborne isocyanate curing agent. By using the coating prepared from the composition disclosed by the invention, apaint film has excellent corrosion resistance even if no antirust coatings are provided, and the problem of system instability caused by hydrolysis of antirust filler is avoided; and meanwhile, the paint film is enabled to have excellent construction performance on the premise that the corrosion resistance of the paint film is guaranteed.

Description

technical field [0001] The invention relates to a water-based coating, in particular to a composition for producing the water-based coating. For example, the outer layer coating and the coating system formed by the two-coat system for water-based containers. Background technique [0002] About 95% of the world's containers are produced in China, which consumes 200,000-300,000 tons of paint every year. From April 2017, national regulations require that all container coatings be transferred to water. [0003] At present, the market is relatively mature for the three-coat supporting system: water-based epoxy zinc-rich primer + water-based epoxy mica intermediate coating + water-based acrylic topcoat. Because water-based paint dries slower than oil-based paint, it is prone to paint film defects. Therefore, switching the water type often brings about a reduction in production efficiency and increases production costs. Therefore, it is particularly necessary to develop a water...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/08C08G18/62
CPCC08G18/6229C09D5/08C09D175/04
Inventor 郝宝祥陆佳伟刘旭阳孙伟祖李燕邓俊英孙家宽
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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