PU color paste is a polyurethane-based pigment dispersion, commonly used in coatings, inks, leather and textiles. Its weather resistance refers to its ability to maintain color and performance under long-term exposure to natural environmental conditions.
Weather resistance characteristics of PU color paste:
Ultraviolet (UV) resistance: Polyurethane materials have good UV stability, but as the UV exposure time increases, color fading or material degradation may still occur. High-quality PU color pastes will add UV absorbers or stabilizers to enhance their UV resistance and delay color fading. Although PU color pastes are generally more UV-resistant, long-term exposure to strong sunlight may cause the color to fade.
High temperature resistance: PU color pastes have certain high temperature resistance, but when exceeding a certain temperature (usually above 100°C), its polyurethane matrix may age, causing color fading or performance degradation. Therefore, when used in a high temperature environment, attention should be paid to the control of the temperature range.
Moisture resistance: PU color pastes generally have good water resistance and moisture resistance, and can maintain color stability for a long time in a humid environment. However, if exposed to high moisture for a long time, slight color changes may occur, especially if no special treatment is performed.
Acid and alkali resistance: PU color paste is generally resistant to acid and alkali. If used in a strong acid or alkali environment, it may cause the color paste to fail or change color, so it is necessary to avoid direct contact with strong acid or alkali substances during use.
Weathering resistance: Under long-term natural climate conditions, PU color paste has excellent weathering resistance. Well-treated PU color paste has a long service life under normal environmental conditions and is not easily affected by external environmental factors.
Summary: PU color paste has good weather resistance, especially under common environmental conditions such as ultraviolet radiation, humidity changes and temperature fluctuations. It has excellent resistance to ultraviolet rays, high temperature, moisture and weathering. However, extreme environmental conditions may affect its stability, so when used in special environments, it is necessary to select appropriate color pastes or do appropriate protective treatment according to actual conditions.
