The Influence Of Blending Ratio On The Mechanical Properties Of Soybean Protein Yarn And Its Woven Products' Wearing Characteristics And Hygiene Performances

In this thesis, the influence of blending ratio on the mechanical properties of soybean protein yarn and its woven products' wearing characteristics and hygiene performances was studied. An appropriate blending ratio range was explored to provide reference for enterprise to develop the soybean protein new woven products.As a first man-made fiber which is invented and industrialized by our country's scientists, the soybean protein fiber owns many excellent properties. It complies with the environment friendly and healthy conception, and now it is very popular among the people in the world.In recent years, the soybean protein fiber was mainly applied in the knitting products, while it had little application in the woven fabrics. It is suitable for home-textiles due to its comfort and unique health functions. Many scientific institutes and famous enterprises are actively engaged in the research and development of relevant products. With this background, the current study focuses on the research of soybean protein woven products through cooperation with Zhejiang Jiali Protein Co., Ltd.Firstly, according to the analysis of yarn evenness, hairiness, breaking strength and elongation rate at break, the influence of blending ratio and line density on mechanical properties of soybean/cotton blended yarn was studied. The results were as follows: (1) Evenness: the evenness of soybean yarn which is provided by the company increased with the increasing percentage of soybean protein fiber. With the same blending ratio, the evenness of the yarn with bigger line density is better; (2) Hairiness: The hairiness of soybean yarn increased gradually with the increasing percentage of soybean protein fiber. With the same blending ratio, the hairiness of smaller line density yarn is better; (3) Breaking strength: The breaking strength of soybean yarn decreased initially and then increased with the increasing percentage of soybean protein fiber, the yarn had the minimum tenacity when the content of soybean protein fiber is around 50%; With the same blending ratio, the breaking strength of 29tex soybean yarn is the biggest. (4) Elongation rate at break: The elongation rate of soybean would be improved as the content of soybean protein fiber is more 35%.Secondly, the thermal-wet comfort property and anion property of soybean protein fabric with different blending ratio and fabric construction were measured. The results were as follows: (l)With the similar fabric construction, the blending ratio had effect on the thermal-wet comfort property, two fabrics with soybean/cotton (80/20 and 60/40) had better comfort property than the soybean fabric.(2)when the blending ratio is the same, yarns of 14.5tex and 18tex had better wet permeability, air permeability than 29tex fabric and worse warmth-retention,(3) By means of gray clustering analysis, a comprehensive evaluation of thermal-wet comfort property and evaluation of thermal-wet comfort of the 10 kinds of fabrics were conducted. Some fabrics with the best properties were obtained, this provided references for enterprises to develop home textiles. (4) The soybean protein fabric could give out certain amount of negative ions, which will be good for health. The blending ratio of 80/20 for soybean/cotton could send the largest amount of negative ions. (5) With the same blending ratio, structure and surface style of different fabric also had obvious influence on the negative ion properties. The fabric could give out more negative ions with smoother surface and larger contacting area. (6) Usually, soybean protein fabrics can be blended with other fabrics. The larger mass specific resistance of the blended fabric, the more negative ions it could send out.According to the analysis of the mechanical properties, thermal-wet comfort and negative ions properties, suggestion can be given to enterprises that woven fabrics with higher content of soybean protein fiber are preferred. Those fabrics can meet the technical need and have better wearing performance. The soybean protein fiber can be blended with cotton to lower the cost, and the final products will be very competitive in the global market.