What are the consequences of combining an alkaline aqueous resin with an aqueous aluminum-silver paste?

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This post was last edited by yuchenchf on 2017-8-5 at 16:26. In the past two years, the market for water-based coatings has become increasingly vibrant, with more and more such coatings being used on a wide scale. As a popular color, silver leads to extensive use of water-based aluminum-silver pastes as well. However, this brings about many problems. This article will explore the consequences that an alkaline pH level of water-based resins has on water-based aluminum-silver pastes. Normal aqueous aluminum-silver pastes are of the inorganic silicon-coated type; aluminum reacts with acids, which leads to passivation and hinders further reactions, while it reacts with bases, resulting in its dissolution and thus affecting the overall hue of the coating. 2Al + 2NaOH + 2H2O = 2NaAlO2 + 3H2. Of course, the water-based aluminum-silver paste used in water-based coatings is not completely reacted; many small black particles and white particulates remain, and a large amount of hydrogen gas is generated, which can cause problems such as swelling of the container. Many customers complain about issues like swelling, darkening, etc., associated with water-based aluminum-silver paste. When testing the performance of this paste, it is also necessary to check whether there are any problems with the resin or solvents used. Whether water-based metal paints can replace oil-based paints as the mainstream product in the market depends largely on the end-users. No matter how good the raw materials are, poor combinations will not result in high-quality products; only proper combinations can yield excellent results.