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Water-based chromium-free dacromet coating and preparation method thereof

A water-based, coating technology, applied in the direction of anti-corrosion coatings, coatings, etc., can solve the problems of adverse effects on wear resistance and strength of coatings, poor dispersion performance, easy sedimentation and delamination, etc., to achieve good appearance performance, improve wear resistance, The effect of local uniformity of the coating

Active Publication Date: 2020-12-11
宁波经济技术开发区达克罗涂复有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this prior art has the following defects: first, although inorganic fillers such as corundum powder and silicon carbide have strong hardness and good wear resistance, their dispersibility in water and organic solvents is poor, and they are very easy to settle and delaminate. This will have an adverse effect on the wear resistance and strength of the coating; second, silica particles are prone to secondary or multiple agglomerations to form silica particle agglomerates, so the median diameter of silica is about 25 μm, Coarse particles and wide distribution range make it difficult to fully disperse in the chrome-free dacromet coating, thus adversely affecting the wear resistance and strength of the coating

Method used

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  • Water-based chromium-free dacromet coating and preparation method thereof
  • Water-based chromium-free dacromet coating and preparation method thereof
  • Water-based chromium-free dacromet coating and preparation method thereof

Examples

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preparation example 1

[0036] The white carbon black-titanium dioxide composite powder in the present invention is prepared by the following method:

[0037] S1. Pre-dispersion treatment of white carbon black: under the conditions of 24°C, rotating speed 1400r / min, ball-to-material ratio 5:1, and slurry concentration 2.5%, add sodium polyacrylate with a total weight of 10% of the slurry, superfine Grind for 90 minutes to obtain silica with a median diameter of 10 μm after dispersion treatment; pre-dispersion treatment of titanium dioxide: under the conditions of 25°C, rotation speed 1400r / min, ball-to-material ratio of 5:1, and slurry concentration of 50%, Ultrafine grinding for 60 minutes to obtain titanium dioxide with a median diameter of 4 μm after dispersion treatment;

[0038] S2. Mix the white carbon black and titanium dioxide after S1 treatment in a weight ratio of 1:1, control the slurry concentration to 10%, ultra-fine grinding for 35 minutes, and sieve to obtain white carbon black / titaniu...

preparation example 2

[0040] The difference between the white carbon black-titanium dioxide composite powder of Preparation Example 2 and the preparation steps of Preparation Example 1 is: S2, mix the white carbon black and titanium dioxide after S1 treatment in a weight ratio of 1:2, and control the slurry concentration to 10 %, ultrafine grinding for 35 minutes, and sieving to obtain a white carbon black / titanium dioxide composite powder with an average particle size of 1100 mesh; the rest are the same as in Preparation Example 1.

preparation example 3

[0042] The difference between the white carbon black-titanium dioxide composite powder of Preparation Example 3 and the preparation steps of Preparation Example 1 is: S2, mix the white carbon black and titanium dioxide after S1 treatment in a weight ratio of 1:3, and control the slurry concentration to 10 %, ultrafinely ground for 35 minutes, and sieved to obtain a white carbon black / titanium dioxide composite powder with an average particle size of 1200 mesh; the rest are the same as in Preparation Example 1.

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Abstract

The invention relates to the technical field of metal anticorrosive coatings, in particular to a water-based chromium-free dacromet coating and a preparation method thereof. The water-based chromium-free dacromet coating is prepared from the following raw materials in parts by weight: 20-40 parts of metal powder, 1-3 parts of white carbon black and titanium dioxide composite powder, 0.5-2 part oftalcum powder, 0.5-2 part of superfine precipitated barium sulfate, 5-10 parts of a silane coupling agent, 10-25 parts of a dispersing agent, 15-35 parts of a water-based adhesive and 15-30 parts of water. The white carbon black and titanium dioxide composite powder is prepared by the following steps: respectively carrying out pre-dispersion treatment on white carbon black and titanium dioxide, conducting mixing according to the weight ratio of 1:(1-3.5), and carrying out ultrafine grinding. The chromium-free dacromet coating has the advantages of being good in abrasion resistance, high in surface hardness and good in corrosion resistance, and the surface performance of a self-tapping screw can be improved after the chromium-free dacromet coating is applied to surface treatment of the self-tapping screw.

Description

technical field [0001] The invention relates to the technical field of metal anticorrosion coatings, in particular to a water-based chromium-free dacromet coating and a preparation method thereof. Background technique [0002] Dacromet is the transliteration and abbreviation of DACROMET, abbreviated as Dacromet, Dacromet, and Dickron. Domestically named zinc-chromium coating, it is a new type of metal anti-corrosion coating with zinc powder, aluminum powder, chromic acid and deionized water as the main components. Compared with other anti-corrosion coatings, the Dacromet treatment process mainly has the following advantages: 1. No hydrogen embrittlement, high-strength steel has the risk of hydrogen embrittlement in the process of pickling and electroplating, although it can be dehydrogenated by heat treatment, but It is difficult to completely remove; Dacromet coating process does not require pickling and activation, and does not cause electrochemical reactions of hydrogen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/04C09D5/10C09D7/62C09D7/61
CPCC08K2003/0812C08K2003/0893C08K2003/2241C08K2003/3045C09D5/103C09D5/106C09D133/04C09D7/61C09D7/62C08K13/06C08K9/06C08K7/26C08K3/22C08K3/08C08K3/34C08K3/30
Inventor 杨刚李国兵谢旭日
Owner 宁波经济技术开发区达克罗涂复有限公司