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Chromium-free fingerprint-resistant coating for externally-crosslinked galvanized steel sheet

A technology of galvanized steel sheet and anti-fingerprint, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of high corrosion resistance that cannot replace chrome film, achieve good emulsion performance, improve compactness, and improve salt spray resistance sexual effect

Inactive Publication Date: 2022-03-25
蓝帆新材料技术(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above metal surface treatment methods can replace the high corrosion resistance of the chrome film.

Method used

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  • Chromium-free fingerprint-resistant coating for externally-crosslinked galvanized steel sheet
  • Chromium-free fingerprint-resistant coating for externally-crosslinked galvanized steel sheet
  • Chromium-free fingerprint-resistant coating for externally-crosslinked galvanized steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An externally linked chrome-free anti-fingerprint coating for galvanized steel sheets, comprising 15% of water-based polyurethane resin, 25% of water-based acrylic resin, 1% of silane coupling agent, 1% of silica sol, 0.1% of wetting agent, and 0.1% of leveling agent %, polyethylene wax dispersion 0.5%, and the rest is water. Under this component distribution ratio, the film-forming material composition is shown in Table 1 below.

[0032]

[0033] Table 1

Embodiment 2

[0035] An externally linked chrome-free anti-fingerprint coating for galvanized steel sheets, comprising 25% of water-based polyurethane resin, 15% of water-based acrylic resin, 3% of silane coupling agent, 3% of silica sol, 0.3% of wetting agent, and 0.3% of leveling agent %, polyethylene wax dispersion 2.5%, and the rest is water. Under this component distribution ratio, the composition of the film-forming substance is shown in Table 2 below.

[0036]

[0037] Table 2

Embodiment 3

[0039] An externally linked chrome-free anti-fingerprint coating for galvanized steel sheets, comprising 30% of water-based polyurethane resin, 20% of water-based acrylic resin, 5% of silane coupling agent, 5% of silica sol, 0.5% of wetting agent, and 0.5% of leveling agent %, polyethylene wax dispersion 5%, and the rest is water. Under this component distribution ratio, the structural composition of water-based polyurethane resin and water-based acrylic resin is shown in Table 3 below.

[0040]

[0041] table 3

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Abstract

The invention provides a chromium-free fingerprint-resistant coating for an externally-crosslinked galvanized steel sheet. The chromium-free fingerprint-resistant coating comprises 25-50% of a film-forming substance, 1-5% of a silane coupling agent, 1-5% of silica sol, 0.1-0.5% of a wetting agent, 0.1-0.5% of a leveling agent, 0.5-5% of a polyethylene wax dispersion and the balance of water, the film forming matter is formed by uniformly mixing waterborne polyurethane resin with a linear structure and waterborne acrylic resin with a linear structure, the ratio of the waterborne polyurethane resin to the waterborne acrylic resin is (1: 2)-(2: 1), and then a curing agent is added for curing and crosslinking. According to the invention, the polyurethane resin with a linear structure and the acrylic resin with a linear structure are mixed, the resins are intertwined, and the curing agent is added, so that the resins are cured and cross-linked, the compactness of the film layer is greatly improved, and the performance of the film layer can be adjusted according to the variety and dosage of different cross-linking agents.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a chromium-free anti-fingerprint coating for externally linked galvanized steel sheets. Background technique [0002] Galvanized steel sheets are widely used in automobiles, building materials, home appliances and electromechanical industries, but the zinc on the surface of metal materials is easily corroded or white rusted in the atmosphere, which affects the appearance of metal materials and causes adverse effects such as poor coating performance. In order to improve the corrosion resistance and coating adhesion of galvanized steel sheets, the industry uses a treatment solution containing chromic acid, dichromic acid or its salts to treat the metal surface, which is commonly referred to as chromium treatment. [0003] However, with the continuous improvement of domestic environmental awareness in recent years, chromium treatment has been gradually eliminated bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D133/08C09D7/63C09D7/65C08F220/18C08F212/08C08F220/06C08F220/20C08G18/12C08G18/66C08G18/48C08G18/32C08G18/34
CPCC09D175/08C09D133/066C09D7/63C09D7/65C08F220/1804C08G18/12C08G18/48C08G18/3206C08G18/348C08G18/6692C08G18/6685C08G2150/00C08L75/08C08K5/3432C08L33/066C08K5/29C08L79/02C08K5/5435C08F212/08C08F220/06C08F220/20C08F2500/26C08G18/3228
Inventor 侯伟
Owner 蓝帆新材料技术(广州)有限公司