Preparation and Performance Study of Matte High Transparent Two-component Polyurethane Varnish
To address the problem of poor transparency of matte two-component polyurethane(2K-PU)varnishes,the specific reasons affecting the transparency of matte coatings were investigated by comparing different types of matting agents,isocyanates,functional additives,and other materials,starting from the matting mechanism of 2K-PU coatings and the influencing factors of transparency.The results show that using inorganic matting agent and organic matting agent together in the high-transparent 2K-PU system can produce a coating with high matting efficiency while maintaining high transparency,and the use of liquid polyhydroxycarboxylic acid amides additives can reduce the impact of anti-settling additives on the transparency of coatings and improve the construction tolerance.Moreover,the use of aliphatic or alicyclic isocyanate curing agents can reduce the impact of aromatic isocyanate curing agents on the transparency of the coatings.
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