Water-based paint silver powder directional arrangement solution (above)

Silver paint (also known as aluminum paint) has a special decorative effect, can make the coating show a metallic texture, can give non-metallic materials a metallic appearance, and thus has a wide range of applications in automotive and 3C electronic products.
, the metallic texture of silver powder coatings is the effect of the directional arrangement of flaky aluminum powders (aluminum sheets are parallel to the substrate surface). However, if the coating drying process appears too much aluminum powder vertical, tilt and other scattered displacement of the situation will seriously affect the metal effect of the final coating, so that the appearance of the coating film hair flowers, dark spots, dark streaks, dull surface, metal texture and other defects .
solvent-based silver powder coating formulation has been very mature, to solve the problem of silver powder orientation or scheduling can be achieved by: regulating solvent volatilization speed, spray viscosity, spray film thickness and the addition of CAB (butyric acid cellulose acetate) and other methods.
, the development of silver powder arrangement technology in water-based coatings is not yet mature, so how to improve the arrangement of water-based paint silver powder is an urgent problem for formula designers in the industry.
Ewing Shanghai Application Laboratory has obtained a technical solution that achieves excellent directional effects of aluminum powder through extensive formulation screening and application testing:
adds a certain amount of dispersant TEGO® Dispersion 740 W and thickener TEGO® ViscoPlus 3060, TEGO® VPlus 3030 in water-based coating formulations.
experiments show that the application of this scheme can not only get good aluminum powder orientation effect, but also in different formulations are applicable (water-based UV silver powder coating and water-based 2K PU silver powder coating, etc.), with strong versatility.
the application of this scheme is:
. TEGO® Dispers 740 W is a non-ionic wetting dispersant for water-based formulations that is well affinity and wraps around silver powder, allowing it to be effectively separated from each other to ensure the dispersion and arrangement of silver powder.
TEGO® ViscoPlus 3030/3060: is a non-ionized polyurethane-combined thickener that provides false plastic thickening, i.e. low shear rate thickening. Because of its strong false plasticity and good late leveling, applied to the water-based silver powder paint formula after spraying construction to the substrate can quickly fix the silver powder, help the later leveling, so that it can be flattened arrangement, thereby improving the overall arrangement effect of silver powder.
because the technical solution involves more experimental content and data, we will be divided into the upper and lower two sharing.
this article will focus on TGO® and the results of the Dispers 740 W.
1, TEGO® Disperse 740 W boosts silver powder dispersion, helps direct the
prefabribrilated aluminum powder dispersion slurry formula is as follows, reference dispersant and TEGO® Dispersion 740 W are calculated as the same addition in significant parts:
aluminum powder dispersion effect is as follows:
In addition, the silver powder arrangement effect can be evaluated by testing dynamic index. Dynamic index is obtained through professional instrument testing, the larger the value, indicating that the better the arrangement of silver powder, the dynamic index in this article using commercialized multi-angle color difference meter test results. As can be seen from the dynamic index, 740W is also helpful to the arrangement of silver powder.
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