Abstract: Ultraviolet aging of B.mori silk fabric was studied under natural and artificial weathering conditions. Exposed samples were removed periodically and characterized by several analytical techniques. During both types of weathering, the results showed that yellowness index presented a rising trend with the extension of aging time; breaking strength of B.mori silk fabric decreased approximately 93.62%, 43.30% under natural aging 150 days and artificial accelerated aging 80 h, respectively; the peak intensity of amide I, and amide II, etc. significantly declined, even disappeared. At the same time, the conformation transition of B.mori silk was from random coil to β–pleated sheet following the prolonging of ultraviolet aging time. What’s more, the content of amino acid obviously declined especially histidine, tyrosine, and lysine etc. In addition, the results evidenced that during natural and artificial weathering, various performances of B.mori silk fabric changed similarly. So artificial weathering can be used to substitute for natural weathering for its weathering evaluation, which is helpful to understand the aging behavior and take measures to avoid aging and elongate its service life.
Abstract: This paper researched the process rapidly degumming and bleaching apocynum venetum, which is one-bath alkali-H2O2 method and a specific technique. The three-factor quadratic general rotary unitized optimization design was used to analyze the three parameters mostly affecting the degumming and bleaching process: the NaOH concentration, the H2O2 dosages and the processing time. Through the experiment, calculation, analysis and verification, the optimum combination of the three parameters for degumming and bleaching process was gotten: NaOH concentration 10～11(g/L), H2O2 dosages 9.5～10.5(g/L), processing time 120～135(min).
Abstract: In this paper，the extraction of rhubarb dye and the stability of rhubarb dye to heat and acetic was investigated. This paper investigated mordant dyeing of the wool fabric with metallic ions Fe2+，Al3+. And the single-factor experiment method and orthogonal experiments were used to study the optimum conditions of pre-mordant dyeing with aluminum ion. As a result, the stability of rhubarb dye to heat and acetic was very good. The optimum conditions of pre-mordant dyeing with aluminum ion was the bath ratio of 1:25, dyeing temperature of 90°C, ph value of 5, and the concentration of aluminum mordant was 5 percent of the fabric and the concentration of the natural dye rhubarb was 60 percent of the fabric.
Abstract: To achieve bio-scouring or biological degumming of the flax roving, an alkalophilic strain was screened from the rotten wrack around Zhoushan archipelago sea area. Determination of enzyme activity showed that the activities of petinase and xylanase were obtained, and enzyme activities are stable under 50°C and at pH values in the range of 6.5 to 9.0. It was utilized to scour the flax roving under alkaline conditions, and the result showed that the strain had a good characteristic of scouring, and less strength loss of flax fiber was 14.19%. Scanning electron microscopy (SEM) showed that the gum in the flax fiber was mostly degraded, and the most smooth fiber surface was displayed, compared with fiber untreated and scoured by caustic soda.
Abstract: Wool fiber was firstly pretreated by nano-SiO2/Ag antibacterial agent, and then dyed with an acid dyes at low temperature by ultrasonic dyeing. Many factors had an important influence on the dye ability and the antibacterial behavior during the dyeing process of antibacterial wool fiber. The experimental results indicate that the dye-takeup rates of antibacterial wool fiber were enhanced with the increase of the concentration of nano-SiO2/Ag, the dyeing temperature, the dyeing time and the ultrasonic frequency (less than 60Hz). However, the antibacterial ratios of wool fiber were declined in the impact of these factors other than the concentration of antibacterial agent.
Abstract: In reacent years, studies on reducing the diameter of microcapsules for practical application to self-healing FRP have been conducted. This study clarifies how filler grain diameter and strength and filler volume fraction affect the interlaminar fracture toughness of FRP. The reinforcement material used in this experiment was carbon fiber fabric sheets. Acrylic particles were used as filler; the mechanical properties were similar to those of microcapsules of self-healing FRP. The filler volume fraction was confirmed to affect the interlaminar fracture toughness. The grain diameters of the hollow particles were smaller, and the Young's modulus of the filler is larger, confirming that the interlaminar fracture toughness increased. High rigidity and small-grain diameter microcapsules are considered to be appropriate microcapsules (enclosing repair agents) for self-healing of CFRP.
Abstract: based on investigation and sample testing, studied on fiber property of color rabbit hair. The color rabbit hair has good spinnability. Foreground of color rabbit hair was analyzed. Being comfortable, dressing property well and environment friendly, color rabbit hair products will play an important role in market. The suggestions were put out that new fashionable super products with color rabbit hair be produced and its added value increased. Color rabbit hair fur is also a good leather material. Offal hair of color rabbit may be used to new extending products. Color rabbit hair market possess good foreground. It should be developed constantly.
Abstract: This paper describes a preliminary investigation on the use of ramie fibre/ phenol formaldehyde (PF) composite to reinforce laminated veneer lumber (LVL). This research was conducted in two phases. Phase 1 the ramie fibre was treated with KH-550 silane coupling agent. Phase 2 different numbers of sheets ramie fibre/PF were added in different location of LVL to reinforce. The reinforced LVL was hot pressed at one time. A control group of unreinforced LVL was also manufactured. The results showed that the improvement in level shear properties of reinforced LVL was obvious no matter what loading direction was perpendicular or parallel. The improvement in modulus of elasticity (MOE) and modulus of rupture (MOR) of partial reinforced LVL was obvious too. Preliminary results showed that using ramie fibre composite to reinforce LVL was possible. This research will further broaden the application field of natural fibres, and provide a new improvement way for wood based composite.
Abstract: In order to understand the basic performances of bamboo yarns, the tensile strength, abrasion resistance and hairiness of yarns are analyzed through the comparison of bamboo yarns, cotton yarns and ramie yarns. Bamboo yarns show a higher strength, a lower breaking elongation, a better abrasive resistance and an obvious hairiness. Because of the existence of uneven fineness, the strength of bamboo yarns display a higher level of unevenness than cotton yarns and ramie yarns. After moisture absorption, the strength, initial modulus and work to break will increase remarkably.