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A kind of chrome-free waterborne metal anticorrosion coating and preparation method thereof

A metal anti-corrosion, chromium water-based technology, used in anti-corrosion coatings, coatings, etc., can solve the problems of long-term preservation of coatings, incomplete passivation of zinc-aluminum metal powder, etc., and achieve good long-term stability.

Active Publication Date: 2017-01-25
沈阳市航达科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the passivation of zinc-aluminum metal powder is not complete, which leads to the hydration reaction of some unpassivated zinc-aluminum metal powder, which makes the paint unable to be stored for a long time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] To prepare the chromium-free water-based metal anti-corrosion coating described in this scheme, proceed as follows:

[0037] First prepare the component A of the coating of this scheme:

[0038] (1) Select 70 kg of 500-mesh zinc powder, 12 kg of FLT2 aluminum powder, add 15 kg of No. 200 solvent oil and mix well, then add MoO 3 Powder 1.0 kg and stir evenly; use the processing method of the invention patent "A Processing Method and Equipment for Ultrafine Flake Metal Powder" (authorized announcement number: CN101829787B) to process spherical zinc powder and spherical aluminum powder into flake zinc powder And flaky aluminum powder, its zinc-aluminum powder flake diameter is controlled at not more than 20 microns, and thickness is not more than 0.2 microns, makes 98 kilograms of passivation flakes zinc-aluminum mixed powder slurry for standby.

[0039] The above-mentioned metal powder processing method: use a closed cylindrical ball mill tank, first load rigid grinding ...

Embodiment 2

[0045] First prepare the component A of the coating of this scheme:

[0046] (1) Select 72 kg of 325-mesh zinc powder, 14 kg of FLT2 aluminum powder, add 16 kg of No. 200 solvent oil and mix well, then add MoO 3 1.5 kg of powder and stir evenly; use the processing method of the invention patent "A Processing Method and Equipment for Ultrafine Flake Metal Powder" (authorized announcement number: CN101829787B) to process spherical zinc powder and spherical aluminum powder into flake zinc powder And flaky aluminum powder, its zinc-aluminum powder sheet diameter is controlled at not more than 20 microns, and thickness is not more than 0.2 microns, makes 103.5 kilograms of passivation flakes zinc-aluminum mixed powder slurry for subsequent use.

[0047] The above-mentioned metal powder processing method: use a closed cylindrical ball mill tank, first load rigid grinding spheres, and then add granular metal powder to be processed, the volume ratio of grinding spheres to granular met...

Embodiment 3

[0053] First prepare the component A of the coating of this scheme:

[0054] (1) Select 75 kg of 500-mesh zinc powder, 15 kg of FLT2 aluminum powder, add 18 kg of No. 200 solvent oil and mix well, then add MoO 3 2.0 kg of powder and stir evenly; use the processing method of the invention patent "A Processing Method and Equipment for Ultrafine Flake Metal Powder" (authorized announcement number: CN101829787B) to process spherical zinc powder and spherical aluminum powder into flake zinc powder And flaky aluminum powder, its zinc-aluminum powder flake diameter is controlled at not more than 20 microns, and thickness is not more than 0.2 microns, makes 110.0 kilograms of passivation flakes zinc-aluminum mixed powder slurry for subsequent use.

[0055] The above-mentioned metal powder processing method: use a closed cylindrical ball mill tank, first load rigid grinding spheres, and then add granular metal powder to be processed, the volume ratio of grinding spheres to granular met...

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Abstract

The invention provides a chromium-free water-based metal anticorrosive paint and a preparation method thereof. The chromium-free water-based metal anticorrosive paint is prepared from such raw materials as a component A and a component B, wherein the component A is prepared from passivated flaky zinc-aluminum mixed paste containing MoO3, a dispersant and a surfactant; the component B is prepared from a silane coupling agent, boric acid and deionized water. The preparation method of the chromium-free water-based metal anticorrosive paint comprises the following steps: firstly, mixing spherical zinc powder and spherical aluminum powder with a solvent oil, secondly, adding MoO3 powder and stirring evenly, and finally, processing the spherical zinc powder and spherical aluminum powder into flaky zinc powder and flaky aluminum powder, thereby obtaining the passivated flaky zinc-aluminum mixed paste; mixing the passivated flaky zinc-aluminum mixed paste with the dispersant and the surfactant under the condition of stirring to form the component A; mixing the silane coupling agent, boric acid and the deionized water together for hydrolysis, thereby forming the component B; evenly mixing the components A and B in the weight ratio of 1: (1.3-1.4) by stirring before use, and applying the paint in a brushing, spraying or dipping way; curing in a heating sintering way. The chromium-free water-based metal anticorrosive paint has excellent long-term stability. Based on 15 microns of coating thickness, the paint has no rust spot through the salt spray test of 1600 hours.

Description

technical field [0001] The invention relates to a preparation method of a metal anticorrosion paint, in particular to a chromium-free water-based metal anticorrosion paint and a preparation method thereof. Background technique [0002] Zinc-chromium coating (Dacromet coating) is a comprehensive high-quality metal anti-corrosion coating with high protection performance and no hydrogen embrittlement. It is mainly used in automobiles, machinery, transportation, tunnels, military, bridges and other industries. Zinc-chromium coatings are mainly composed of zinc powder, aluminum powder, chromic anhydride and deionized water. The preparation process needs to use chromic anhydride to passivate the zinc powder and aluminum powder, so that the coating contains hexavalent chromium or Trivalent chromium. [0003] The European Union implemented the RoHS Directive on July 1, 2006, that is, the "Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/04C09D7/12C09D5/10
Inventor 殷跃军韩长智
Owner 沈阳市航达科技有限责任公司
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