Antibacterial Finishing Of Wool Fabric Based On Tris(Hydroxymethyl) Phosphine Cross-linking

Wool is a natural protein fiber,fluffy and soft,with good breathability and moisture permeability.However,under suitable temperature and humidity conditions,wool fabrics can easily absorb fungi,bacteria and microorganisms,and create conditions for their propagation and spread.It affects the performance of fabrics and may also cause human skin infections.In response to this problem,the researchers cross-linked covalently the material of antibacterial properties to the surface on wool fabric through the cross-linking agent to prepare the wool fabric with antibacterial properties.In this paper,tris?hydroxymethyl?phosphine?THP?was used as a cross-linking agent to covalently cross-link the hyperbranched polymer?HBP-NH₂?and lysozyme on the surface of wool fibers to prepare wool fabrics with antibacterial properties.The ammonium molybdate colorimetric method was used to test the phosphorus content,Energy dispersive X-ray?EDX?,and Fourier transform infrared spectroscopy?FT-IR?to verify the reaction of cross-linking hydroxymethyl groups of THP and amino groups of wool fibers.The experimental results show that Mannich reaction occurs between the hydroxymethyl group in THP and the amino group on the wool fiber.Based on the above studies,HBP-NH₂ was covalently bonded to wool fiber by using THP cross-linking.Characterize the surface morphology and structure characteristics of HBP-NH₂ modified wool fiber by amino content test,FT-IR and scanning electron SEM,and test the antibacterial properties,anti-felting and changes in dyeing properties and breaking strength.The results of the study showed that after THP-HBP-NH₂ treatment,the bacteriostatic rate reached 92.4%,after five washings,the bacteriostatic rate remained 80.1%with good antibacterial properties and washing resistance.With HBP-NH₂ treatment alone,the felt shrinkage of wool fabric decreased from 20.7%to 17.3%,which failed to achieve the purpose of wool fabric anti-felting;after THP-HBP-NH₂ treatment,the felt shrinkage of wool fabric decreased to 7.43%,reaching the machine washable standard.The dyeing performance of wool fabrics have also been significantly improved at low temperatures.Chicken egg white lysozyme were grafted on the surface of wool fiber using THP as the cross-linker to obtain antibacterial functionalization of wool fabric,THP immobilized lysozyme on the wool fiber?wool-THP-lysozyme?was obtained.The structure and morphology of the wool-THP-lysozyme were characterized by FT-IR,staining test and SEM.Furthermore,the optimization of immobilization parameters was performed for active lysozyme and test the enzymatic properties of lysozyme.Antibacterial property and washing resistance of the wool fabric immobilized lysozyme was also evaluated.The results showed that THP successfully immobilized lysozyme to the surface of wool fiber.Compared with untreated wool fabrics,immobilized lysozyme has good pH resistance,temperature stability,handling stability and storage stability.The rate of bacteriostatic wool fiber with lysozyme immobilized was 95.38%.After five cycles washing,the rate of bacteriostatic remained73.31%,with good antibacterial properties and washing resistance.