Dyeing and Anti-ultraviolet Properties of Anthocynins Extracted from Purple Sweet Potatoes for Silk

摘要

Purple sweet potatoes were applied to extract anthocyanins for dyeing silk fabrics. Dyeing and anti-ultraviolet properties of anthocyanins were investigated. The color yield, exhaustion behaviors, fastness properties and anti-ultraviolet properties of dyed silk fabrics were also discussed. The results showed that high color strength value (K/S value = 3.01) was achieved at 50°C and pH 3. The washing and rubbing fastness properties were enhanced by mordant dyeing method using alum. The dyed silk samples displayed good anti-ultraviolet and the UV transmittance was decreased by 46% at 300nm and 58% at 360nm.