Abstract: In this paper, silk fabrics were dyed with natural dyestuff copits. The effects of dyeing PH value, temperature, time, and dye solution concentration on the K/S values were studied. The ultrasonic dyeing was compared with conventional dyeing. The results showed that the optimal conventional dyeing process were dyeing PH value neutral, temperature 100°C, time 40min, the relative dyeing solution concentration 3%, and the optimal ultrasonic dyeing process were dyeing PH value neutral, dyeing temperature 40°C, time 40min, the relative dyeing solution concentration 3%. Ultrasonic dyeing process greatly improved the dye uptake and made obvious effects on energy saving.
Abstract: For exploiting green ecological cotton fiber products with the multifunction, a new cotton fiber crosslinked with chitosan of low molecular weight (CCCF) was prepared through the sodium periodate oxidation method. The reaction between amino groups of chitosan and aldehyde groups in the oxidized cotton cellulose occurred to obtain the CCCF in aqueous acetic acid solutions. The aldehyde group content in oxidized cotton cellulose increased markedly with the sodium periodate concentration, and the maximum weight gain of chitosan introduced on cotton fiber was 11.63% of the weight of cotton fibers. Furthermore, the crosslinking properties were respectively investigated by measurements of FT-IR and XPS spectra, the analysis indicated that the chitosan molecule was crosslinked on the surface of cotton fiber by the C=N covalent bond. This resulting CCCF is a novel ecological fiber and has more abilities of potential modification, which suggested useful information in planning applications for these modified cotton fibers.
Abstract: In this research, cotton fabrics were colored with a pigment suspension, and then treated with an acid cellulase to investigate the influences of pre-existing pigment on cellulase action. It was found that the pigment on cotton surface could increase the affinity between cotton and cellulase protein due to the mutual attraction between pigment molecule and non-polar residues in the enzyme. However, it was observed that the existing pigment would suppress enzymatic activity by testing the soluble reducing sugars liberated during the treatment. The main reason is that the pigment could reduce the accessibility of cellulase protein to the cotton molecular chains by steric hindrance.
Abstract: The study focused on structure and fiber length of Java kapok fruit from Pate County, Java Tengah in Indonesia for effective utilization. The internal structure of Java kapok fruit can be divided into two parts: fiber bundle and combination of short staple and seeds. The two parts had little adhesion and large difference in fiber length. Fiber bundle method was put forward to measure fiber length, which had strong correlation with Hand-measured staple length. Furthermore, analysis showed the length of kapok fiber had some correlation with length of fruit, and no correlation with length of middle perimeter. Also, the three parts of fruit: head, middle and tail had no significant difference in fiber length.
Abstract: Silk fabrics are highly popular with people for their excellent properties, with science and living standards progress, the natural and no added finishing method is pursuited by people especially, functional textile products become more and more popular. In this paper, silver nanoparticles were deoxygenated by using natural cactus solution. This silver nanaparticles were prepared under the unpolluted environment. The basic raw material is natural selection, preparation method is simple, non-polluting, eco-friendly and to address the reliability of a better way. Natural fabrics treated with natural plant, not only improve the added value of the product, but also achieve natural of the fabric, meet the requirements of the modern people. This research product the cactus silver nanoparticles silk fabric, demonstrated that the cactus solution can fix the nano-silver uniform on the surface of the silk fabric. Studied the antibacterial property of the silk fabric after finishing, discussed the fabric breaking strength and antibacterial property of silk fabric under different concentration、temperature and time. Finally, the best finishing process obtained is: 0.01mol/L silver ammonia is 2mL, the extract from cactus is 50mL, liquor ratio is 1:50, dipping temperature is 60°C, dipping time is 60min.
Abstract: The use of natural plant fibers as reinforcing fillers in fiber-polymer composites has drawn much interest in recent years. Natural plant fibers as reinforcing fillers have several advantages over inorganic fillers such as glass fibers; they are abundant, readily available, renewable, inexpensive, biodegradable, of low density, and of high specific strength. Hemp fibers are one of the most attractive natural plant fibers for fiber-reinforced composites because of their exceptional specific stiffness. In this review, we summarize recent progress in developments of the hemp fiber reinforced composites such as hemp fiber reinforced unsaturated polyester (UPE), hemp fiber reinforced polypropylene (PP), hemp fiber reinforced epoxy composites, and so on, illustrate with examples how they work, and discuss their intrinsic fundamentals and optimization designs. We are expecting the review to pave the way for developing fiber-polymer composites with higher strength.
Abstract: This research focuses on the promotion of China-hemp in the dye bath, the effect of salt, alkali, time and temperature on the dyeing properties. The optimum processes of thermostability of China-hemp dyeing with reactive dyes are determined by comparing the effect of different concentration of the agents on the K∕S value and color fastness.
Abstract: Rinsing of cotton fabric dyeing with reactive dye was carried out by ozonation process. The results indicated that ozonation rinsing is adequate to achieve washing and rubbing fastness results comparable with conventional soaping without significant colour yield losses and colour differences. The rinsing wastewater could be simultaneously decolorized and degarded during the ozonation rinse procedure. Ozonation rinsing could take advantages of saving water, energy and time as it was performed at 50 °C for 3-7 min with a short process, and decreasing environmental load as it avoids the use of organic detergent used in conventional soaping.
Abstract: Sol - gel method and doped with Fe3+ modification techniques were used, prepared for high catalytic activity of iron-doped titanium dioxide nanoparticles,which loaded on the activated carbon for Degradation of Methyl Orange. Such as crystal structure, particle size, load morphology, chemical state and optical absorption characteristics of the doped titania nanoparticles were characterized by using XRD, SEM, and UV-Vis. Fe-TiO2 catalysts for visible light response and the catalytic degradation of methyl orange in water performance were studied. The results showed that: catalysts prepared were anatase, the particle size decreases with the more amount of iron-doped. The phenomenon of Fe3+-modified TiO2 red shift were obviously. Compared with the undoped catalyst,degradation of Fe3+-TiO2 containing activated carbon improved significantly both in the UV and fluorescent light.