关键词: 银杏叶内生菌分泌红色素, HBP－QAC改性蚕丝织物, 染色, K/S值, 色牢度

Abstract: This study extracts endophyte from ginkgo leaf for cultivation, separates red pigment secreted by endophyte and uses red pigment for real silk fabrics subject to graft modification with amino－terminated hyperbranched polymer quaternary ammonium salt HBP－QAC for the study on dyeing process. Optimal conditions for dyeing process are obtained through single－factor optimal experiment on dyeing process conditions of real silk fabrics modified with HBP－QAC with red pigment secreted by ginkgo biloba endogenous by using K/S value of dyed fabric and relevant color fastness as assessment indicators: temperature 70℃, pH 3, dosage of anhydrous sodium sulphate 15g/L and time 60min. Fabrics dyed under such optimal conditions have washing fastness at grade 5, rubbing fastness at grade 4~5 and color fastness to sunlight at grade 3. Positive surface charge of real silk fabrics after modification with HBPQAC increases, thus reinforcing the acting force of ionic bond between fabric and dye and improving K/S value and color fastness of dyed silk fabrics.

Key words: red pigment secreted by ginkgo biloba endogenous, modified silk fabrics with HBP－QAC, dyeing, K/S value, color fastness