Preparation And Mechanism Study Ofβ-cyclodextrin / Permethrin Supramolecular Inclusion Complex And Its Finishing On Cotton Textile

β-cyclodextrin has a particular cavum structure whose outside is hydrophilic and insideis hydrophobic. This unique hydrophilic cavity allowsβ-cyclodextrin to include guest samllmolecules whose size matchβ-cyclodextrin cavity. The host and guest molecule can formstable inclusion complexes by means of intermolecular weak bond interaction. In this thesis,we found a method to prepare steady inclusion complex ofβ-cyclodextrin and permethrinthrough the particular cavity ofβ-cyclodextrin or its functional derivate (MCT-CD). And then,we use water-based polyurethane (WPU) to adhesive the complex on the cotton fabric toprepare a mosquito repellent textile. The main research contents and conclusions are listed asfollows：In this thesis, the inclusion complexes ofβ-cyclodextrin and permethrin are prepared byultrasonic waver, and the influence factors on yield are study. Use orthogonal experimentmethod to optimize the technology, the result is :1. Factors influence synthesis the complexhave following order: temperature>mole ratio>ultrasonic power>reaction time; 2. Besttechnological conditions is: temperature 40℃, n(β- cyclodextrin)：n(permethrin)=1:1.5,ultrasonic power 70KHz, reaction time 2h. Adopt UV, IR and DSC to analysis phase, thermaland optical properties of the complex. Confirm existence of the complex and measurestructure of it. The conclusion shows that complex has new phase property compared to agentbefore reaction.β-cyclodextrin and permethrin can be formed a inclusion complex by meansof intermolecular weak bond interaction. 3. The ground state geometries, vibrationalfrequency, IR and Raman intensity and inclusion energy(E) and thermodynamics parametersof permethrin,β-cyclodextrin and their inclusion complex are calculated by using of DFT atB3LYP/6-31G(d) level of theory. The good agreements between predicted spectra andexperimental ones prove that the theoretical predicted geometries are correct and accord withthe real structures. The negativeΔG,ΔH andΔS values suggest that the formation ofβ-CD·cypermethrin inclusion complex is a spontaneous and enthalpy-driven process.The inclusion complexes are dispersed into water-based polyurethane (WPU) emulsionto prepareβ-cyclodextrin/ permethrin/WPU finishing agent, and then be adhered on textile bypadding and immersing twice. The influence of finishing technology on rate of body weightgain of cotton textile is studied. The results show that bath ratio, padding time, cure temperature and time have different influence on body weight gain rate. Overall consideration,the optimized technology is: bath ratio is 1:30, padding time is 15min, and curing condition isat 130℃for 3 min. After testing its stretch property, whiteness,moisture permeability andventilation property, we find that the wear behaviors are degraded in different degree; theanti-mosquito test experiment show that the finishing textile has higher mosquito repellentproperty.Compared to the other anti-mosquito finishing technology, the agents we used in thisthesis have following advantages: host and guest molecular have non-toxic and harmlesscompared to other anti-mosquito agents; the inclusion rate of is high; release of permethrin iscontrollable, extend mosquito repellent time; mosquito repellent agent is hard to wash-out.Although the wear behavior are degraded in different degree due to using WPU as adhesive,the finishing textile can also meet the standard of the wear behavior of cotton.