Protein Extraction And Products Development From Waste Textile Fibers

Every year,people will consume a large amount of natural protein fiber textiles in our country.Most of the textiles will become a waste.Land filling and incineration processes are the pervasive methods to treat waste textile fiber,and these methods will cause huge waste of resources.Studying about reusing protein from waste fiber gradually attracts researchers' attention all over the world.In this paper,I studied reasonable ways to extract protein from waste protein fiber,and developed high value-added products to avoid the waste of resources and to play a positive role in promoting the rational use of natural protein fiber.In this paper,the dissolution and regeneration of natural protein fiber were studied.The influence of NaOH concentration was studied to dissolve wool through reduction method and found that the wool dissolving rate increased with the concentrations of sodium hydroxide rising,when concentration of NaOH between 1.0-2.25wt%.The dissolution rate can reach 67.0%.After compared the effect of dissolving fibroin fibers by using lithium chloride solution and by calcium chloride solution,we found that using the lithium chloride and calcium chloride aqueous solution to dissolve silk fiber,the solubility of both was very close.But the recovery rate by using the lithium chloride aqueous solution was much lower than the recovery rate by using calcium chloride aqueous solution.The orthogonal experiment results show that the optimal solution for dissolving silk fiber is using 46%calcium chloride solution to dissolve silk fiber at 100? for 2h.The infrared analysis shows that the dialysis method can extract pure regenerated protein,and the super molecular structure neat degree of the regenerated protein is higher than the degummed silk fibroin's.Keratin/PAN blending fiber can be prepared by wet spinning.The diameter of the keratin/PAN blending fiber is large,and the keratin/PAN blending fiber has a good tensile strength,but its strength irregularity is higher.The infrared analysis shows that the blend fiber contains a small amount of keratin.Silk fibroin and silk fibroin/PVA nanofibers were prepared by using the method of electrostatic spinning.The influence of electrostatic spinning conditions on silk fibroin nanofiber morphology was studied.The result shows that silk fibroin concentration too low will cause discontinuity of nanofibers and produce a large number of nanoscale micro balls;silk fibroin concentration too high will cause uneven degree of nanometer fiber increased,and will cause fiber bending deformation;micro pump flow too fast will cause fiber deformation and adhesion;electrostatic field intensity too high will cause the uneven degree of nanofibers rise.The optimal conditions to get cylindrical nanofibers are micro pump controling the flow rate of 0.1 ml/h,using regenerated silk fibroin anhydrous formic acid solution of 10wt%,20 kv voltage,pole pitch(distance of needle to plate)8 cm,jet mouth use No.9 needle.Adding a small amount of polyvinyl alcohol to the low concentration of silk fibroin solution can obviously improve the properties of nanofibers.