Papers by Keyword: Wool

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Authors: Steve J. McNeil, Yi Hu, Larissa I. Zaitseva
Abstract: We investigated whether the fastness properties of wool textiles could be enhanced by modifying the dyeing and post-dyeing procedures in ways designed to increase the crystallinity of dyes in the wool. In one approach, the dyebath was maintained at 98°C for three hours, in another, dyed fabric was rapidly cooled. In a third approach, dyed fabric was alternately held in solutions of 80°C and 40°C. Commercial acid levelling and acid milling dyes were used. Fastness to light and washing were assessed by standard methods, and samples were exposed to sunlight behind glass for 12 months. The crystallinity of the dyes in the wool was assessed by x-ray diffraction. Small increases in lightfastness and crystallinity occurred, with the two classes of dyes behaving differently. This preliminary study demonstrated that the concept of increasing the crystallinity of dyes in wool to improve lightfastness warrants further investigation.
Authors: Shi Xiong Yi, Yong Chun Dong
Abstract: The non-ionic reverse micelles used for dyeing wool were prepared with a non-ionic surfactant Triton X-100 (TX-100) by injecting small amount of acid dye aqueous solution. And the adsorption properties of three water-soluble anionic acid dye including Mordant Black 9, Acid Black 234 and Acid Orange 156 onto wool in TX-100 reverse micelle were studied and compared. Then effect of W value (molar ratio of the injected water to TX-100) and pH level on dye adsorption was also investigated. The results indicate that Higher W value and Low pH level would increase the adsorption amount of the dye onto wool. The adsorption of the dye onto wool showed better agreement with Langmuir isotherm equation. Mordant Black 9 with lower molecular weight and one sulfonic group exhibited the higher adsorption capacity than the other dyes.
Authors: Jun Zhang, Jing Chun Lv, Ren Cheng Tang
Abstract: The photoyellowing and poor UV-protection ability of silk, wool and nylon fabric can be improved through the anti-UV finishing with UV-absorbers. This study is concerned with the adsorption properties of a water-soluble benzotriazole UV-absorber on silk, wool and nylon. It was found that the adsorption kinetics of the UV absorber on the three fibers followed the pseudo second-order kinetic model and the rate constant indicated a faster adsorption rate for UV absorber on silk than those for wool and nylon. The activation energies for the adsorption process on silk, wool and nylon were found to be 49.74, 63.92 and 78.21 kJ/mol, respectively. The adsorption of the UV-absorber on silk and wool had the characteristics of low affinity constant and high saturation value whereas that on nylon showed a small saturation value with a remarkably high affinity constant. The electrostatic interactions between the positively charged amino groups in fibers and the anionic sulfonate groups in UV absorber have an important role in the adsorption of UV absorber.
Authors: Xin Jin, Yong Yue Wang, Chang Fa Xiao
Abstract: Polypyrrole/wool composite fiber was prepared by in situ oxidative polymerization from vapor phase and liquid phase pyrrole at room temperature, by using FeCl3 as catalyst. The effect of deposition technique on the surface morphology, mechanical properties and the electrical stability of fibers were discussed. The result showed that deposition technique has a strong effect and fiber prepared by vapor phase deposition has much fine and small granular structure, lower resistance, better mechanical property and electrical stability.
Authors: Chun Yan Hu, Qian Jie Zhang, Ke Lu Yan
Abstract: Anti-felting properties of knitted wool fabric treated with keratin were investigated by a laboratory scale treatment. The effects of concentration of keratin, treatment temperature and time, drying temperature on the anti-felting properties of wool were studied respectively. The study provided shrinkage data perfectly comparable with those obtained by the currently used shrink proofing processes, but with some important advantages: the total absence of chlorine in the process and the complete biodegradability of keratin without harmful and toxic chemical agents. Therefore, this method showed us the possibility of keratin treated wool fabric for industrial use.
Authors: Qian Jie Zhang, Ke Lu Yan
Abstract: In this paper, a shrinkproofing treatment of wool fabrics was carried out by excilamp combined with enzyme. Shrinkproofing properties of the treated fabrics were evaluated by measuring the values of directional friction effect (DFE), felting shrinkage and weight loss. The results showed that felting shrinkage of the treated wool fabrics could achieve the machine washability standard (ISO 6330 and IWS TM 31) with low fiber damage. Surface morphology and chemical composition of the treated fabrics were observed and analyzed by SEM and FTIR-ATR. This treatment was compared with low-temperature oxidation combined with enzyme method (ARS Process).
Authors: Qing Fu Zhang, Wen Fang Yang, Yan Li Qiao, Xiao Xing Shen
Abstract: As the problem of shrinkage on wool fabric, the chitosan was applied to solve it in this paper. The volume of retraction bulb and strength were considered to describe the results of anti-shrinkage after the finishing. It shows that great anti-shrinkage is got in this experiment, and the best treatment process is defined as follow: the concentration of chitosan 6g/l, pH 5, 80min, 90°C and bath ratio 1:50.
Authors: Ning Ning Lv, Yan Zhang
Abstract: 2-Indolylfulgimide was synthesized to examine the practical dyeing feasibilities and behaviors. A one-pot efficient process was discovered with good yield (52%). The color changing properties of fulgimide in solvents and on wool fibers were investigated. With UV irradiation, fulgimide showed color variation from light yellow to light red. The same color changing behavior appeared in the wool fiber which was dyed with 2-indolylfulgimide through a normal acid dye dyeing process.
Authors: Saniyat Islam, Anna Cheung, Li Jing Wang, Lyndon Arnold, Rajiv Padhye
Abstract: Textile substrates can be coated with suitable polymer solutions to enhance the surface functionality. This paper highlights the deposition of chitosan (CHT) on wool nonwoven substrates using traditional pad-dry-cure method; and its potential application in medical textiles specifically wound dressing products. Wool nonwoven substrates were prepared by pre-treating with BMIMCl (ionic liquid) and application with different concentrations of CHT. The liquid uptake and antimicrobial efficacy was evaluated. It was shown that 0.3% CHT treated samples demonstrated good liquid uptake and excellent antimicrobial properties.
Authors: Mei Rong Sun, Jing Fei, Jia Shi Cai, Jie Zhao
Abstract: Cashmere is one of the finest and softest animal fibers used by textile industry. False declaration is quite common due to its scarcity and high economic value. We have developed an objective method for quantifying cashmere and wool mixture based on DNA technology. Mitochondrial DNA, a species-specific genetic material exists in each cell, presenting a relatively strong capacity to resist physical and chemical treatments, seems to be an ideal target for species identification. As goat and sheep belong to a different genus, a real-time PCR based analysis method for quantifying cashmere and wool mixture was developed. Cashmere collected from different countries and regions were employed to prove its effectiveness. Dyed samples provided by CCMI round trial showed that it is a reliable and objective method. Various cashmere products of different processing stages were tested with the method. Results showed that the method can be applied in authenticity inspection of commercial products.
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