| Crop straw resources are abundant, which will effectively relieve the energy crisis that caused by the continuous consumption of the non-renewable energy, and resource structure well adjusted if they can be used properly. In addition, fibers are widely used in industrial and agricultural production, accelerating the development of socio-economy. If the straw resources can be combined with fiber materials and developing its utilization value effectively will not only generate economic benefits but also promote the reform and development of the related industry.The proposing of regenerated cellulose provides a new way for the renewable resource, the selection of the raw material and dissolution system are the two key points in this field. Cotton, wood, bamboo, hemp and crop straw are all involved in the raw material of cellulose. The development of its dissolution system is much faster and comprehensive. Compared with the traditional viscose method, new dissolution systems have been developed fast, such as NMMO, PF/DMSO, ionic liquids, NaOH/urea and so on. Currently, many kinds of regenerated cellulose fibers have been developed in both China and abroad. Few researches have been reported about wet spinning based on the corn regenerated cellulose. Therefore, exploratory research about the field has been investigated in this study. Based on the cellulose pulp, filament of the corn straw skin cellulose has been successfully developed, the weaving and dyeing properties of the filament have been evaluated.Firstly, the chemical composition, the content of α-cellulose, ash and Fe, as well as the whiteness of the corn straw skins are analyzed by Fourier transform infrared spectroscopy and calcinations. Results show that the key ingredient of the raw material is cellulose, with few lignin in it. The content of a-cellulose, ash, Fe and whiteness are94%,3.2%,32ppm and88% respectively. Meanwhile, the dissolution of the cellulose in PF/DMSO has been investigated. After dissolving under certain temperature and stirring, the cellulose fiber is filtered by the leach. The spinning solution is obtained after24hours. The state of the solution is observed by optical microscope.Secondly, the rheological properties of the cellulose/PF/DMSO solution are investigated by computer-controlled viscometer. Results show that the solution is shear thinning. With the increasing of temperature and shear rate, the non-Newtonian index and structural viscosity index decreased. Therefore, the proper temperature and shear rate are65～70℃and100-135s-1. The rheological property is a significant guidance for the discussion of the spinning process of cellulose.Finally, based on these investigations, the filament of corn straw skin cellulose is obtained by wet spinning technology, the effect of the spinning process on the structure and property of cellulose fibers is discussed. By changing the temperature of spinning, concentration of the coagulating bath, drawing ratio and the holes of orifice, the effects of the spinning process on fibers have been investigated. The properties are analyzed by wide angle X-ray diffraction and scanning electron microscope. Results show that under the certain conditions (The concentration of the spinning solution is6.5wt%, the pump extrusion is1.5mL/rad, spinning speed is1.96m/min, the temperature of coagulating bath is25℃, the content of coagulating bath is DMSO-H2O, temperature of first water bath is35℃, temperature of second water bath is40℃), the best process parameters are as follows:spinning temperature is70℃, the concentration of coagulating bath is15wt%, the draw ratio is1.35and the holes of orifice is50. |
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