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VCI-containing flake cold-plating zinc and aluminum protective coating on steel structure surface and preparation method thereof

A cold galvanizing and aluminum coating technology, applied in anti-corrosion coatings, epoxy resin coatings, coatings, etc., can solve problems such as affecting the coating weight and construction efficiency, generating air bubbles in the topcoat, and easily porous coatings, achieving decorative Excellent performance, strong metal texture, good coating gloss effect

Active Publication Date: 2009-04-01
AVIC BIAM NEW MATERIALS TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of binder in the slurry is not enough to fill the pores between the nodular zinc particles, which dooms the coating structure to be porous, with large porosity and poor shielding
At the same time, if the zinc powder content in the coating is too high, the coating will be easily porous, causing transverse copolymerization damage (delamination). If other high-solid component topcoat is coated on the zinc-rich primer, the topcoat will generate bubbles tendency to increase
During the construction, gun blockage and tube failure caused by the precipitation of nodular zinc often occur, which affects the coating weight and construction efficiency.

Method used

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  • VCI-containing flake cold-plating zinc and aluminum protective coating on steel structure surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] Preparation of test panels

[0048] Unless otherwise specified, test panels are usually cold-rolled low-carbon steel plates. Before the steel plate is coated with alcohol-soluble (or water-based) VCI flake-type cold-dip galvanized aluminum coating, it will first be subjected to Sa2.5 level sandblasting treatment. Coating of Test Parts

[0049] After mixing the two components of the alcohol-soluble (or water-based) VCI flake-type cold galvanized aluminum paint in proportion, spray the prepared paint on the above-mentioned prepared test sample board with an air spray gun. After spraying, let it dry naturally for at least two weeks, then carry out the following tests.

[0050] bending experiment

[0051] Achieved through the test procedures of ASTM-D522. Use a piece of tape coated with pressure-sensitive adhesive to stick to the coated surface of the deformed part of the test panel, and then quickly peel it off. Coatings are calculated based on the amount of paint car...

Embodiment 1

[0056] Embodiment 1 (preparation of alcohol-soluble VCI flake type cold galvanized aluminum coating)

[0057] Preparation of component A: Add 300 grams of flake-type zinc powder with a thickness of ≤0.2 μm and a diameter of ≤20 μm and 100 grams of flake-type aluminum powder with a thickness of ≤0.1 μm and a diameter of ≤25 μm into 100 mL of 95% ethanol Stir for more than 0.5 hours to fully mix the two, add 2 grams of modified polysiloxane type leveling agent, 150 grams of polyvinyl butyral and 10 grams of cyclohexylamine nitrite, and stir for more than 0.5 hours until uniform .

[0058] Preparation of component B: Dissolve 160 g of alkyl silicate in 100 mL of 95% ethanol, stir well and mix evenly, add 2 g of organic bentonite, and stir evenly.

[0059] Before coating, mix the two components A and B and stir them evenly to get the finished silver-gray alcohol-soluble VCI flake-type cold-dip galvanized aluminum coating.

Embodiment 2

[0060] Embodiment 2 (preparation of alcohol-soluble VCI flake type cold galvanized aluminum coating)

[0061] Preparation of component A: Add 150 grams each of flake-type zinc powder and flake-type aluminum powder with a thickness ≤ 0.4 μm and a diameter ≤ 40 μm, add to 200 mL, 95% n-butanol and stir for more than 0.5 hours to fully mix the two Evenly, add 5 grams of leveling agent M, 200 grams of epoxy resin and 20 grams of hexamethylenetetramine, and stir for more than 0.5 hours until uniform.

[0062] Preparation of component B: Dissolve 180 grams of alkyl silicate in 100 mL of 95% n-butanol, stir and mix well, add 10 grams of fumed silica, and stir evenly.

[0063] Before coating, the two components A and B are mixed, and after stirring evenly, the silver-gray finished alcohol-soluble scale-type cold-dip galvanized aluminum coating is obtained.

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Abstract

A squama type cold galvanizing aluminum coating used on the surface of steel structure and containing VCI (Vapor corrosion inhibitor). Besides, the invention also provides a VCI squama type cold galvanizing aluminum complex coating system on the surface of steel structure and prepared from the coating.

Description

technical field [0001] The present invention relates to a scale-type cold-dip galvanized aluminum coating used on the surface of steel structures and containing VCI (Vapor corrosion inhibitor, gas phase sustained-release agent) and a preparation method thereof, and the VCI scale zinc-aluminum protective coating on the surface of steel structures prepared thereby system. Background technique [0002] Zinc-rich coating is the most widely used anti-rust primer in the field of steel structure anticorrosion and shop primer. Unlike the usual hot-dip galvanizing process, this coating can be sprayed and cured at room temperature, commonly known as "cold galvanizing". However, the zinc-rich coatings actually used in domestic and foreign projects all belong to spherical zinc coatings, that is, all use spherical zinc powder as a filler. In the nodular zinc coating, in order to pursue a high dry film zinc content to ensure the conductivity and service life of the coating, the addition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/10C09D129/14C09D163/00C23F11/00
Inventor 杨忠林杨振波郭万生李运德师华黄玖梅于一川陈立江胡立明姜小刚张亮张军
Owner AVIC BIAM NEW MATERIALS TECH ENG
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