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Preparation method of coated aluminum powder

A technology of aluminum powder and coating, which is applied in the field of preparation of aluminum powder coating, can solve the problems of insufficient coating technology of aluminum powder and pigment, complex production process, etc., solve the problem of hydrogen evolution, simple production process, good acid and alkali resistance and glossy effect

Inactive Publication Date: 2011-03-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the deficiencies of the existing aluminum powder and pigment coating technology and the problem of complex production process, to provide a preparation method for aluminum powder coating, which has a simple production process and has a good effect on aluminum powder and pigment. Coating, the prepared aluminum powder pigment has good acid and alkali resistance, gloss, and good dispersion in water-based paint system, which solves the "hydrogen evolution problem" of paint

Method used

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  • Preparation method of coated aluminum powder
  • Preparation method of coated aluminum powder
  • Preparation method of coated aluminum powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the first step, in parts by mass, 20 parts of aluminum powder pigments are dispersed in 90 parts of dissolved ethylene glycol butyl ether, and stirred at room temperature for 20 minutes.

[0034] In the second step, 27 parts of tetraethoxysilane were added into the reaction vessel of the first step, and stirred at room temperature for 20 minutes. Then, 65 parts of water were added, and the pH was adjusted to 8 with triethanolamine and acetic acid, and the mixture was reacted at room temperature for 2 hours.

[0035] The third step is to filter the aluminum powder and pigment suspension prepared in the second step, and repeatedly wash it with ethylene glycol butyl ether solvent to remove impurities in the reaction, and finally wash it with water for 3 to 5 times, and dry it in an oven at 50°C. Dry to obtain aluminum powder pigment coated with silica film.

[0036] The coated aluminum powder pigment was stored at room temperature for six months in the water-based pain...

Embodiment 2

[0038] In the first step, in parts by mass, 10 parts of aluminum powder pigments are dispersed in 45 parts of isopropanol, and stirred at room temperature for 30 minutes.

[0039] In the second step, 12 parts of triethoxysilane were added into the reaction container of the first step, and stirred at room temperature for 20 minutes. Then, add 25 parts of water, adjust the pH=9 with ethylenediamine and acetic acid, and react at room temperature for 3 hours.

[0040] The third step is to filter the aluminum powder and pigment suspension prepared in the second step, and repeatedly wash with isopropanol solvent to remove impurities in the reaction, and finally wash with water for 3 to 5 times, and dry it in an oven at 50°C. The aluminum powder pigment coated with silica film was prepared.

[0041] The coated aluminum powder pigments were stored at room temperature for six months in water-based paint systems with pH=4 and pH=9, no hydrogen gas was released, and good gloss was maint...

Embodiment 3

[0043] In the first step, in parts by mass, 15 parts of aluminum powder pigments were dispersed in 67.5 parts of ethanol, and stirred at room temperature for 20 minutes.

[0044] In the second step, 17 parts of dimethyldiethoxysilane was added into the reaction container of the first step, and stirred at room temperature for 20 minutes. Then, 40 parts of water was added, and pH=8 was adjusted with triethanolamine and acetic acid, and reacted at room temperature for 4 hours.

[0045] The third step is to filter the aluminum powder and pigment suspension prepared in the second step, and repeatedly wash with isopropanol solvent to remove impurities in the reaction, and finally wash with water for 3 to 5 times, and dry it in an oven at 50°C. The aluminum powder pigment coated with silica film was prepared.

[0046] The coated aluminum powder pigments were stored at room temperature for six months in water-based paint systems with pH=4 and pH=9, no hydrogen gas was released, and g...

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Abstract

The invention relates to the technical field of the surface treatment of metal powder, in particular to a preparation method of coated aluminum powder, comprising the following steps of: mixing and stirring aluminum powder and an alcohol / ether solvent; then, respectively adding organosiloxane, water and a pH regulating agent; reacting and mixing; and pumping and filtering to prepare coated sheet aluminum powder. The preparation method can complete a coating process at normal temperature, has simple manufacturing technology and can better coat aluminum powder paint. The prepared aluminum powder paint has better acid-base resistance, glossiness and good dispersivity in a water paint system and solves the problem of hydrogen liberation of aluminum powder in chromium-free aqueous Dacromet paint.

Description

technical field [0001] The invention relates to the technical field of surface treatment of metal powder, in particular to a preparation method of aluminum powder coating. Background technique [0002] Aluminum powder pigment is one of the common metallic pigments. It is deeply loved by designers for its unique beautiful decoration, anti-corrosion and metallic flash effect. Its usage has grown rapidly in the last century. The main application fields are industrial coatings, automotive coatings, printing inks and plastic processing industries. [0003] As foreign regulations restricting the discharge of toxic substances into the atmosphere become increasingly strict, people try to replace organic solvents and thinners with water in many products, such as water-based paints, water-based inks, etc., which makes the research and development of water-based aluminum powder pigments more important. Since aluminum reacts easily with water, its metallic luster will be destroyed in w...

Claims

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Application Information

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IPC IPC(8): B22F1/02
Inventor 刘建国李庆鹏严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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