Preparation method of water-borne coating additive for oily aluminum paste and water-borne coating prepared from water-borne coating auxiliary

Abstract

The invention relates to a water-borne coating additive, more specifically to the water-borne coating additive by the application of which oily aluminum paste may be directly used in a water-bone coating, and a preparation method of the water-born coating. The water-borne coating additive is an acrylate phosphate containing phosphate and hydroxyl. The content of phosphate is 5 to 25% by weight, and the content of hydroxyl is 1 to 5% by weight. Molecular weight is controlled at a range from 4000 to 20000, and molecular weight distribution Mw / Mn is 1.1 to 2.0. The oily aluminum paste is dispersed by a solvent, and then the water-borne coating additive is added. A dispersion liquid can be formed by wrapping treatment, and the dispersion liquid can be directly added into a water-borne resin to produce the water-borne coating. Operation processes of the method are simple, storage stability of the product is excellent. Gas generation of the aluminum paste (aluminum powder) in water can be prevented effectively. Resistances to high pressure conductivity, weather, heat and humidity, acid, alkali and pipeline circulation are excellent, and adhesive force to base materials is strong. No aluminum powder will drop in a long term.

Description

[technical field] [0001] The invention relates to a class of water-based coating additives, in particular to a water-based additive that can directly apply oily aluminum-silver paste to water-based coatings, and a preparation method for water-based coatings using the same. [Background technique] [0002] Aluminum silver paste (aluminum powder) is one of the important metal pigments, because of its high bright metallic luster, it has been widely used in the coating industry, plastic industry and printing ink. At present, the annual domestic production and sales of aluminum silver paste (aluminum powder) is about 20,000 tons, of which 8,000 tons are imported from abroad and its products, and the demand for aluminum silver paste (aluminum powder) in the vehicle manufacturing industry is 10,300 tons. The demand for aluminum silver paste (aluminum powder) is about 2,500 tons, and the demand for household appliances (aluminum powder) is 1,000 tons. [0003] Since aluminum silver ...

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Problems solved by technology

The second generation is the more popular SiO 2 Coating, such as application numbers 200610123751.8, 200810030678.9, 200910013247.6, 200910094838.0, etc., some even in SiO 2 On the basis of the coating, organic modification is added to improve the compatibility with the coating base material and enhance the adhesion, such as the aluminum powder treatment technology of Japan Toyo, and the Hydrolan series of Eckart, but this kind of SiO2 coating technology is based on the original aluminum Add SiO on powder basis 2 The coating layer is used to achieve the effect of protecting the aluminum powder. Although the performance of preventing gas, heat and humidity resistance, weather resistance and pipeline cycle resistance has achieved excellent comprehensive performance, SiO 2 The coating layer will inevitably affect the original brightness, sparkle and hiding power of the aluminum powder, and it will easily cause the aluminum powder to agglomerate during the processing process, the manufacturing cost is also very expensive, and the market promotion is difficult

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