Water-based low-temperature two-component polyurethane primer-topcoat silver powder paint and preparation method thereof

The invention discloses a water-based low-temperature double-component polyurethane primer-topcoat silver powder paint and a preparation method thereof. The silver powder paint comprises a film-forming material formed by combining a high molecular weight/high Tg/low acid value/low hydroxyl first water-based hydroxyl acrylic acid dispersion and a water-based high molecular weight/moderate Tg/medium-high hydroxyl second water-based hydroxyl acrylic acid dispersion. In preparation raw materials of the first water-based acrylic acid dispersion, a caprolactone ring-opening and HEMA condensation product is used as a functional hydroxyl monomer. According to the silver powder paint disclosed by the invention, a coating has excellent finger pressing drying speed (50 DEG C 20min off line), stacking resistance, activation period, weather resistance, surface effect, adhesive force, chemical resistance, high-temperature and high-humidity resistance, wear resistance and the like, so that the silver powder paint is used fo