Extraction Of Wool Keratin And The Preparation Process Of Functional Fiber Materials

China is one of the largest producers of cashmere in the world.Cashmere,as a kind of raw material of textile,is widely used in various garment products.However,due to the limitations of textile technology,quality and management of cashmere,a large amount of dead and corase wool which are unsuitable to use.This not only wastes resources,but also brings environmental pressure,which is not conformed to the construction of resource-saving and environment-friendly society.Therefore,the recovery and utilization of coarse wool,which is one of the parts of cashmere carding,is of great significance to the sustainable development of social economy.The diameter of coarse wool is 60?m which is much larger than the diameter of commercial wool?13?m?.In addition,the coarse wool has a denser internal structure and higher crystallinity,so that it has a greater decomposition difficulty than commercial wool.In this paper,a reducing agent Na₂S₂O₃ with stronger reducing ability than NaHSO₃ was used to extract keratin from coarse wool.The extraction rate of the corase wool's keratin with Na₂S₂O₃ method is 80%,which is nearly 55%higher than the traditional reuction C method?using NaHSO3 as reductant,23%?.In this paper,the keratin solution and the adhesive PA were mixed to modify polyester fabric and cotton fabric,and the finish process of various fabrics was analysed to determine the best finish process.The optimal finish condition of keratin solution for cotton fabric are:keratin 25 g/L,binder PA 25 g/L,bath ratio 1:20,immersion time 65 min and immersion temperature 55°C.Compared with the untreated sample,the angles of rapid elastic recovery and slow elastic recovery of cotton fiber are increased by 13.1%and26.8%,respectively,the treated sample had better anti-wrinkle effect.The optimal conditions for the antistatic finishing of polyester fabrics are:keratin 10 g/L,binder PA 10g/L.Comparaed with unfinished polyester fabric,the static voltage on the surface of polyester fabric is reduced by 44.9%,the half-life of static charge on polyester fabric is reduced by 77.6%.In this paper,nano-silver?AgNPs?-doped keratin/PA6 electrospinning solution was prepared by using HCOOH as solvent and reducing agent.The keratin/PA6 composite nanofiber membrane doped with AgNPs was prepared by electrospinning technique.The effects of different keratin and AgNPs contents on the morphology,air filtration,pore size,moisture permeability,thermal stability and antibacterial properties of the composite membrane were investigated.The results show that the addition of keratin and nano-silver increases the electrical conductivity of the electrospinning solution,reduces the viscosity of the electrospinning solution,and the diameter of the nanofibers.The addition of keratin not only improves the air filtration efficiency,but also enhances water-vapour transmission?WVT?.HAADF-STEM?high-angle annular dark field-scanning transmission electron microscopy?shows that AgNPs is uniformly distributed in keratin/PA6?30/70?nanofibers.The addition of the Ag nanoparticles?AgNPs?gave a strong antibacterial activity to the composite membrane against Staphylococcus aureus?99.62%?and Escherichia coli?99.10%?.Bacterial filtration efficiency?BFE?of the composite membrane against S.aureus and E.coli were 96.8%and 95.6%,respectively.All of the results suggested a great potential of coarse wool extraction and application in air filtration field.