响应面法优化核桃青皮色素的羊毛染色工艺

Optimization of the wool dyeing process of pigments from walnut green husks by response surface methodology

在单因素预实验基础上,通过UV扫描图谱研究核桃青皮色素的热稳定性,采用响应面法进一步优化不同温度(80~100℃)、染液质量浓度(10~30 mg/m L)、时间(50~70 min)、p H值(3~5)下羊毛的染色工艺,以未染色羊毛为标准品,ΔE(总色差)为指标,通过扫描电镜图对比分析羊毛染色前后形貌变化。结果表明:核桃青皮色素在100℃内热稳定性良好;优化的染色条件为p H值5,时间70 min,温度100℃,染液质量浓度13.20 mg/m L,此条件下,ΔE值为75.012,与模型预测值相符,对ΔE值而言,温度是影响它的最显著因素,时间和染液浓度交互作用极显著(P<0.01);扫描电镜图表明羊毛染色前后形貌未发生改变,实验结果可作为羊毛染色的最佳工艺。

This research aimed to optimize the wool dyeing process of pigments from walnut green husks. Based on preliminary experiments, after thermal stability of walnut green husk pigments was analysised by UV scanning spectras, the wool dyeing process at different test conditions of temperature （ 80 - 100 ℃ ）, dyeing solution concentration （ 10 - 30 mg/mL）, time （ 50 - 70 min）, pH value （ 3 - 5 ） was further optimized on the basis of unstained wool as standard substance and AE（the total color difference） as total index by response surface methodology（RSM）. Finally, compared with the morphology change of wool by SEM images. The results showed that, walnut green husk pigments had good thermal stability range 100 ℃. Optimum dyeing conditions were as follow ： pH value was 5, time was 70 min, temperature was 100 ℃ ,dyeing solution concentration was 13.20 mg/mL. Under above conditions,AE was 75. 012, which was in good agreement with the model predicated value. The results of RSM showed temperature was the most significant factor for the value AE, while time and dyeing solution concentration alao had very significant（P 〈0.01 ）interactive on the value AE;SEM images indicated the wool morphology has not changed,which proved the results of model optimum dyeing conditions eoulde be used as the optimum process for wool dyeing.