Studies On The Forming Process Of Jute Fiber Needle-Punched Nonwoven Material And Its Degradation Performance

In our country, green environmental protection and low-carbon have already been mentioned in the sustainable developmental strategy. It is inevitable to produce the degradable material from the natural fiber actively in order to reduce the pollution and use resources reasonably.The long vegetable fibre is easy to plant and the output is high.It cannot create the plundering development to the resources. And,it can degrade in the nature after the product was abandoned. So, it conforms to the environmental protection and the ecological sustainable development.This topic take the jute as the main raw material, and produce different non-woven fabrics via two different procedures. According to the material properties and end-use of non-woven fabric, the first process procedure is:mix Jute and polyester fiber→carding→needle punch. Mainly by a single variable method conducts analysis, it discusses how needle punching depth, needle punching frequency and the number of needle punching influence the structure and properties of materials.And then study the forming process of jute non-woven materials, the Performance changes after adding chemical adhesive. The results show that if that three parameters Increase within a certain range, mechanical properties of jute non-woven get a significant increase. But when the needle parameters increase to a certain extent, it causes bad conditions, includeing jute fiber breakage and needle breakage, which lead to decreased mechanical properties of non-woven materials. After Chemical adhesive enhancement processing, Material thickness is reduced, the surface density increases and all the breaking strength, tear strength and bursting strength of the mechanical properties get substantially increased.Generally speaking, the needle nonwoven which take jute fiber as main material,its tensile strength is not good, so how to increase mechanical properties of these products effectively will be the key. the second process procedure is:mix Jute and hot melt-fiber→air laid→needle punch and then thermal bonding enhancing. And at the same time also do research about how thermal bonding enhancement technology influence material mechanical properties. With different proportions(7:3,6:4和5:5) of two kinds of fiber, jute and 4080, it can be made into different kinds of non-woven materials, so the proportions make different effects on sample tensile strength, it can make a Comparison. Then in the thermal bonding process, different time(10s,15s,15s),temperature(115℃,130℃,145℃)and pressure (6MPa,8MPa, 10MPa) get different results, the parameters changing have a influence on sample tensile strength. The results show that the tensile strength of three different proportion of the sample A (7:3),B (6:4) andC (5:5) increaing obviously with a single variable (time, pressure and temperature) growing, and the more the hot-melt fiber proportion, the greater the tensile strength. Time and temperature make more great influence on mechanical properties than the pressure.Finally,through testing the mass loss,surface morphology, microscopic condition of fiber entanglement and mechanical performance of jute/melt fiber needle-punch materials which by natural degradation, soil degradation and rapid aging,we can not only research and analyze the degradability differences and degradation mechanism of the materials in different degradation environment,but also provide reference for further reseraching the overall performance and application properties of jute fiber need-punch materials. The results show that,in natural degradation process, the mass loss and surface morphology changed most obviously in the period from 80 to 120 days. The mass loss in outdoor exposure degradation is 37.82%,while 100% in soil degradation.The tensile strength loss of the sample is 75% and 100% respectively,and the degradation rate in soil is much larger than in natural enviroment. In the rapid aging test,the tensile strength loss rate of the sample is about 25%～30% in 0～50h,while it reached 55%～60% in 50～100h, and get a large chang.