Water-based non-chrome-zinc-aluminum anticorrosive paint and preparation method thereof

An anti-corrosion coating, zinc-aluminum technology, applied in anti-corrosion coatings, coatings and other directions, can solve the problems of weakened bonding, increased viscosity, difficult to withstand high temperature, etc. good corrosion effect

Active Publication Date: 2017-08-08
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The flaky zinc-aluminum powder commonly used in zinc-aluminum coatings can form an alloy layer with the metal substrate to improve the anti-corrosion effect when baked at high temperature (above 200 ° C), while commonly used binders such as acrylic resin and titanate are difficult to withstand high temperatures ; The silane coupling agent series can form silanol bonds in a short time after hydrolysis, and can form dense -Si-O-M-bonds with metal substrates, which can play an excellent bonding effect, but the silanol bonds will become weaker with time. Self-crosslinking occurs, resulting in increased viscosity, reduced adhesion, and paint failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The provided anti-corrosion coating is made by mixing A and B components, the mass ratio of A and B components is 1.17:1, among which, A component is composed of zinc powder, aluminum powder, nano-SiO 2 , wetting agent and dispersant, the zinc-aluminum powder is in the form of scales, its average particle size is 10-25 μm, and the thickness is 0.1-0.3 μm; nano-SiO 2 The particle size of the powder is 15-20nm, the wetting agent is dipropylene glycol; the dispersant is nonylphenol polyoxyethylene ether (NP-10). The specific composition is zinc powder 24wt%, aluminum powder 6wt%, wetting agent: 18wt%, dispersant: 5wt%, nano-SiO 2 : 1 wt%.

[0024] Component B is composed of silicone resin emulsion, deionized water, corrosion inhibitor, thickener, adhesion promoter, defoamer, and film-forming aid. The silicone emulsion is benzyl silicone resin. 23wt%, deionized water accounted for 20wt%, corrosion inhibitor 1.0wt%, thickener 0.4wt%, adhesion promoter 1wt%, defoamer 0.5wt%...

Embodiment 2

[0027] The mass ratio of A and B two components is 1.02:1, and the composition of A component is the same as in Example 1, and the specific composition content is: zinc powder: 23wt%, aluminum powder: 6wt%, wetting agent: 16wt%, dispersant : 4wt%, nano-SiO 2 : 1.5wt%.

[0028] The composition of component B is the same as in Example 1, wherein the silicone emulsion is phenylmethyl silicone resin, the addition amount is 24wt%, deionized water accounts for 21.5wt%, corrosion inhibitor: 1.0wt%, thickener: 0.5wt% , Adhesion promoter: 1.5wt%, defoamer: 0.5wt%, film-forming aid, leveling agent and brightener total 0.5wt%.

[0029] Concrete operation steps are with embodiment 1.

[0030] The chromium-free metal anti-corrosion coating made in this example has a volatile organic compound VOCs content of about 22%, can withstand high temperatures of 300°C, and has good anti-corrosion performance. The neutral salt spray resistance of the obtained coating is ≥720h.

Embodiment 3

[0032] The mass ratio of A and B two components is 1.27: 1, and the composition of A component is the same as in Example 1, and the specific composition content is: zinc powder 25wt%, aluminum powder 6.5wt%, wetting agent: 19wt%, dispersant : 5wt%, nano-SiO 2 : 0.5wt%.

[0033] Component B is composed of: silicone resin emulsion: 20wt%, deionized water: 20wt%, corrosion inhibitor: 1.0wt%, thickener: 0.5wt%, adhesion promoter: 2wt%, defoamer: 0.45wt% %, the total amount of film-forming aids, leveling agents and brighteners is 0.05wt%. The A component is fully ground and mixed with the B component, and mechanically stirred for 5-10 hours to obtain the water-based chromium-free zinc-aluminum anticorrosion coating.

[0034] The chromium-free metal anti-corrosion coating made in this example has a volatile organic compound VOCs content of about 27%, can withstand high temperatures of 300°C, and has good anti-corrosion performance. The neutral salt spray resistance of the obtaine...

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Abstract

The invention discloses a water-based non-chrome-zinc-aluminum anticorrosive paint, which is prepared from a component A and a component B with the mass ratio being (1 to 1.3):1. The component A is prepared from the following materials in percentage by weight: 20 to 32 percent of zinc-aluminum powder, 15 to 25 percent of wetting agent, 1 to 5 percent of dispersing agent, and 0.5 to 1.5 percent of nanometer SiO2; the component B is prepared from the following materials in percentage by weight: 15 to 25 percent of organic silicon resin emulsion, 20 to 30 percent of deionized water, 0.5 to 1.0 percent of corrosion inhibitor, 0.05 to 0.5 percent of thickening agent, 1 to 5 percent of adhesion promoter, 0.05 to 0.5 percent of antifoaming agent, and 0.05 to 0.5 percent of coalescing agent, flatting agent and brightener. The paint provided by the invention is low in content of VOCs (Volatile Organic Chemicals), green and environmentally-friendly, high temperature resistant, high in adhesive force and good in corrosion resistance, and the anti-salt spray capability is larger than or equal to 720h.

Description

[0001] Technical field: [0002] The invention relates to the technical field of coatings, in particular to a water-based chromium-free zinc-aluminum anticorrosion coating and a preparation method thereof. [0003] Background technique: [0004] The high-efficiency protective performance of zinc-aluminum coating (Dacromet coating) mainly depends on the high content and strong toxicity of hexavalent chromium in the coating. Since the use of hexavalent chromium in various countries has been increasingly restricted, such as the European Union In July 2006, it was clearly stipulated that the use of hexavalent chromium in electronic and electrical equipment exported to the EU was prohibited. This regulation has become a technical barrier for my country's products to be exported to the EU. Chromium-free zinc-aluminum coating is a coating with anti-corrosion properties. Because it does not contain hexavalent chromium and realizes clean production, it has gradually been widely accepted ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D5/10C09D7/12
Inventor 王冠华陈江韩梁慧雷永乾
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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