Preparation method of aqueous aluminum silver paste

Abstract

The invention provides a preparation method of aqueous aluminum silver paste. The preparation method comprises the following steps of: 1, adding an aluminum powder pigment and acetone into a vessel, stirring and filtering to obtain washed aluminum powder; 2, adding the washed aluminum powder obtained in the step 1 into an alcohol solvent, ultrasonically dispersing, adding into a reaction vessel, adding organic silicon, stepwise adding ammonia water, abnd stirring to make the mixture react 3, filtering the product obtained in the step 2 and drying in a vacuum drying box; 4, adding the product obtained in the step 3 into an acetone solution of a comb-like polymer comprising an anchor group and a hydrophilic group and stirring; and 5, removing the acetone from the product obtained in the step 4 by decompressing and distilling to obtain the aqueous aluminum silver paste. According to the preparation method of the aqueous aluminum silver paste, coating completeness is enhanced, falling, dusting and agglomeration of a coating are prevented, and the coating has high dispersity, so that the using performance of the prepared aqueous aluminum silver paste is integrally enhanced.

Description

technical field [0001] The invention relates to a preparation method of water-based metallic pigment, in particular to a preparation method of water-based aluminum silver paste. Background technique [0002] Aluminum powder pigment has excellent gloss and tone, and is one of the important metallic pigments. With the development of science and technology, there are more and more varieties of aluminum powder pigments, which are now widely used in various industrial and commercial fields such as automobiles, motorcycles, sports equipment, electrical products, and interior and exterior decoration of buildings. [0003] As people pay more and more attention to environmental protection, aluminum powder that can be applied to water-based systems, that is, water-based aluminum-silver paste, has also received a lot of research. Water-based aluminum silver paste has a unique environment-friendly function, and can be widely used in water-based coatings and water-based inks. Water-bas...

AI Technical Summary

Problems solved by technology

However, in order to make the water-based aluminum powder have good hydrophilic performance, oil-soluble substances such as stearic acid and oleic acid cannot be combined on the surface of the aluminum powder, which makes the compatibility of the water-based aluminum powder and resin and the floating performance of the aluminum powder in the medium decline

In addition, silica-coated aluminum powder will also reduce the surface tension, which will further reduce the compatibility and cause the problem of "powder falling" after the film is dried

The floating performance of water-based aluminum powder decreases, which will cause the aluminum powder to precipitate and aggregate in the water-based system, which is not conducive to application

[0009] For example, the Chinese patent application publication CN101235226A disclosed on August 6, 2008 provides a method for preparing a silica-coated water-based aluminum-silver paste, which is obtained by coating aluminum powder with a silica film. It is a water-based aluminum silver paste with good dispersibility in aqueous solution and excellent acid and alkali resistance, but this method belongs to single-layer coating, and there are defects such as easy peeling off of the coating layer, incomplete coating and powder falling. Does not completely prevent the formation of hydrogen

[0010] For example, the Chinese patent CN100465235C authorized and announced on March 4, 2009 provides a method for preparing coated aluminum powder pigments. The method utilizes organosiloxane to form a first coating on the surface of aluminum powder pigments. The second coating of the aluminum powder by the polymer formed by the reaction can better solve the problem of "gassing" of the traditional aluminum powder during use and storage, while maintaining a good metallic luster. The polymerization reaction in the coating system will destroy the originally formed silicon dioxide film, and the polymer-coated silicon dioxide film obtained by the reaction will also destroy the hydrophilicity of the silicon dioxide film while achieving complete coating. In addition, the polymer itself lacks hydrophilic segments, so the hydrophilicity of the system is insufficient, which will lead to difficulty in dispersing the coated aluminum powder in the water-based system

[0011] It can be seen that none of the solutions in the prior art can fully solve the problem of complete coating, no shedding of the coating layer, no powder falling, dispersibility and agglomeration

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