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In this experiment, the natural pigment contained in the red dragon fruit was used to replace the synthetic dye, and the fruit and vegetable liquid was extracted by a juicer. It was soaked in three different solvents: water, methanol, and ethyl acetate for 7 days, filtered, and concentrated under reduced pressure to obtain the red color. Pitaya extract, the fixing agent uses luteolin/trehalose type surfactants (LP200, LP400, LP600, LP1000, LP2000), and the fixing experiment is compared with commercially available anionic and non-ionic surfactants. , Using the RUBI dyeing machine to set 37℃ and 80℃, the constant temperature time is 30 minutes, to explore the effect of a series of luteolin/trehalose surfactants and commercially available anionic surfactants and non-ionic surfactants on the red fire dragon Discussion on the effect of dyeing wool fabrics and human hair with natural pigments. Ultraviolet/visible light spectrometer was used to investigate the absorption of ultraviolet/visible light in the pigment of red dragon fruit extract with wavelengths of 280~650nm. The result of dyeing residual liquid was detected by ultraviolet/visible light spectrometer, and it was found that the bleached hair bundle of real human hair was at 80℃ Ethyl acetate extraction concentration of 0.501wt% (red pitaya ethyl acetate extraction concentration of 0.501wt% + luteolin/trehalose type surfactant fixing aid LP400 has the highest peak), but LP200 has the lowest light absorption value and the best dyeing effect good. Then use the colorimeter to explore the level and intensity of dyeing. According to the results of this experiment, the red dragon fruit natural pigment is used in three different concentrations and three solvents for wool cloth and human hair bleaching hair bundles at 37°C and 80°C after dyeing in a handheld spectrophotometer to display all the data. The K/S strength value of LP400 measured at 80℃ for bleaching hair bundles at a concentration of 0.501wt% ethyl acetate extraction is 11.986, which is the highest, which means that when the extraction concentration of ethyl acetate at high temperature is 0.501wt%, the dyeing effect of LP400 is the best. good. The ΔE value of 0.43 for wool cloth using 80℃ methanol extract concentration and non-ionic surfactant is the lowest color difference value, which means that the wool cloth in the red dragon fruit natural pigment methanol extract has a concentration of 0.167wt% and commercially available non-ionic surfactant. The best level of dyeing.
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