how to product waterborne aluminium paste
what is water basic aluminium paste , it is different with solvent basic , it is only can working with water system , suitable all water basic coating , can be direclty use water to disperse .however if use tap water , better waiting after 24 hours then used it , due to tap water have chronicle content
Preparation method of water-based aluminum silver paste?Before answering this question, first of all, let us learn the common basic concepts of aqueous aluminum aluminum paste, aluminum silver paste belongs to water environmental protection product, is different from ordinary oil aluminum silver paste, it only soluble in water, so the system suitable for water-based coating, can be directly with water to disperse, it is important to note that if you use tap water, need to open water more than 24 h,Make the residual chlorine fully volatilized, because the free chlorine ions will have a strong corrosive to the silver pulp.At present, there are four common preparation methods of water-based aluminum silver paste in the market:
First, add corrosion inhibitor method: add corrosion inhibitor method in the process of coating, add corrosion inhibitor, this process has little influence on the color and brightness of oily aluminum silver paste, low production cost, short cycle, more popular in foreign countries;
Two, chromic acid, phosphoric acid or its salt passivation method: this process has low production cost, short cycle, good product brightness, can effectively maintain the original color and brightness of oily silver paste, in coating, printing and other industries is very popular, but with the improvement of environmental protection requirements, has gradually declined;
3. Inorganic silicon dioxide coating method: the water-based aluminum silver paste produced by this process is close to the original hue and brightness of the oily silver paste, and has the characteristics of strong acid and alkali resistance and dense coating layer. The finished paint can be stored for 6-12 months.
Four, inorganic organic double coating or hybrid coating method: the process is also called double coating process, is still very rare on the market, the main reason is that the coating process is complex, high cost, long cycle and color loss, but has strong acid and alkali resistance and shear resistance.
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