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

摘要： 从银杏叶提取内生菌进行培养，分离内生菌所分泌的红色素，将红色素用于经端氨基超支化合物季胺盐HBP－QAC接枝改性的真丝织物进行染色工艺研究。以染色织物的K/S值和相关的色牢度为考核指标，进行银杏叶内生菌分泌的红色素对HBP－QAC改性真丝织物染色工艺条件的单因素优化实验，得到的较佳染色工艺条件为：温度70℃，pH为3，元明粉用量为15g/L，时间为60min。在该较优条件下所染织物的皂洗牢度达到5级，摩擦色牢度达4~5级，耐日晒色牢度3级。HBP－QAC改性后的真丝织物的表面正电荷增加，使得织物与染料之间的离子键作用力增强，故而使其染色真丝织物的K/S值和染色牢度提高。

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