By analyzing the products sold in the market, there are roughly the following categories according to the varieties of the base materials:
Acrylate emulsion type includes styrene-acrylic emulsion and acrylate (modified) emulsion, which is suitable as primer and matte finish. The coating made by the base material has a relatively low cost, a general hardness, and is not easy to produce shrinkage cavities, but the film forming performance is poor, the gloss is poor, and it is not suitable for high gloss paint. Poor wear resistance, difficult to defoam, generally used in combination.
Polyurethane dispersions include aromatic and aliphatic polyurethane dispersions which are excellent in yellowing resistance and are more suitable for outdoor use. Their film-forming properties are good, self-crosslinking gloss is high, wear resistance is good, and bubbles and shrinkage cavities are not easily generated. But the hardness is general, the price is more expensive, suitable for making bright topcoat, floor paint and so on.
Polyurethane/acrylic dispersions can be self-crosslinkable or used in two-component systems.
Aqueous urethane oil is a one-component, similar to oily urethane oil, redox drying type, need to add drier when filming, fast drying, good gloss, good hardness, wear resistance, good water resistance, suitable for bright surface , floor paint.
The aqueous two-component polyurethane component is a polyurethane dispersion with -OH, and the second component is an aqueous curing agent, which is mainly aliphatic. After the two components are mixed and applied, the cross-linking reaction can significantly improve the water resistance, hardness and fullness, and the gloss also has a certain effect, the comprehensive performance is good, the paint is not easy to yellow, and is especially suitable for outdoor coating.
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