Coatings, additives Smoothing agents

Owing to the thinness of the coatings, properties such as reflectivity and smoothness are chiefly governed by the substrate, although addition agents find useful application in improving these properties. 

Properties of deposits Deposits can be produced that are adherent, coherent and finely crystalline. Addition agents, e.g. organic sulphonamides can improve the deposit structure so that thick coatings can be produced free of nodules and blisters. The production of very smooth thick deposits of copper has been reported Thin deposits tend to reproduce the substrate topography, but some cases of levelling have been reported. The brightness tends to fall with increasing thickness. 

The line section analysis of the flat part of the nickel coating obtained in the presence of both the basic and the top brightening addition agents is shown in Fig. 36. The roughness of this flat part of the surface is very small and less than the atomic diameter of nickel. For this reason, it can be said that the flat parts of the surface are smooth on the atomic level. 

Chem. Descrip. Silicone-based (10%) in xylene Uses Finish additive, mar resist, aid, slip agent for solv.-based systems, paints, NC- and acid-curing wood lacquers, yacht varnishes, parquet lacquers, paper coatings, leather finishes Features Reduces orange peel, Benard s cell effect improves flow out gives smooth satin feel to surf. 

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