Hu Lingling,Lu Weichao,Li Zhongjian,Liu Yue,Zhang Yun
A method is proposed to replicate the spectral curves of standard dyestuffs based on the mixing of absorption spectra between non-primary dyestuffs to quickly screen out the dyestuff components for the matching color of blended dyestuffs, so as to solve the problems of low color matching efficiency and high resource consumption in the dye development process. The relationship between the dye absorption spectra and color was explored first. The screening of non-primary dyes based on spectral and color characteristics of single dyes formed the initial formulation. A computer program implementing the least squares method was then developed to replicate the spectra of 15 different specimen dyes using their blending formulations, and the feasibility of these formulations was assessed by comparing them with the actual dyeing. It was found that 13 formulations could achieve the same color as the specimens under the illuminant D65, and 11 of them did not show any metamer mismatching under any of A and F02 light sources. The Goodness-of-Fit ( R n ) values of the spectral curves between all these 11 formulations and their specimens were greater than 0.95. After R n decreased from 0.95, four formulations showed metamerism, and 2 formulae could not achieve the same color under the illuminant D65. The above results indicated that there was a good correspondence between the consistency of the spectral curves and that of colors, and the method is feasible to match color and avoid metamer mismatching by successfully screening non-primary dyes.
Jiayin Liu,Jialing Tan,Hao Liu,Yunjie Yin,Chaoxia Wang
Linen, an important industrial crop, is commonly used in the textile field. The development of temperature-controlled linen fabrics is important for the high-value utilization of cellulose-based industrial products. The linen fabrics with color and performance changes controlled by temperature are prepared via the vacuum impregnation process utilizing biomass three-component thermochromic dyes. Currently, three-component thermochromic dyes based on the bisphenol A (BPA) color developer have received special attention due to high saturation color and reversible color-changing performance. However, the toxicity and carcinogenicity of BPA limit its applications in security inks, decorative coatings, plastics, etc. Exploiting excellent and safe biomass color developers for three-component thermochromic dyes remains a challenge. Tea polyphenols (TP) are proposed as alternatives to BPA to prepare the blue, red, yellow, and green three-component thermochromic dyes. According to the laws of subtractive color mixing, multicolor-tunable thermochromic dyes are obtained by color matching of red, yellow, and blue dyes to span multiple shades. Biomass thermochromic dyes are adopted to fabricate temperature-controlled linen fabrics by the vacuum impregnation process. Temperature-controlled linen fabrics can change color reversibly between the original color and achromatic color. The color-changing occurs due to the ring opening and closing of leuco dyes triggered by the solid-to-liquid transition of solvent. The phase transition temperature of the thermochromic dyes absorbed on the linen fabric is 46 ℃. As the temperature increases, the contact angle of temperature-controlled linen fabrics decreases from 129° to 29°, resulting in a change from hydrophobic to hydrophilic with 49 J g −1 of thermal energy stored. The linen fabrics exhibit temperature-controlled changes in color, surface wettability, strength, and thermal insulation. This eco-friendly method with biomass thermochromic dyes for the preparation of color-changing linen fabrics provides a new approach, which is contributing to the development of cellulose-based smart color-changing textiles.
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