Based On The Hydrolytic Cellulase/SDS Synergistic Preparation Of Water-based Ultra-fine CuPc Pigment And Its Fixing And Binding System

Because of its simple dyeing process,low pollution and low cost,ultrafine pigment has been paid more and more attention.Anionic surfactant sodium dodecyl sulfate?SDS?can significantly reduce the surface tension of water,and is widely used in the field of pigment dispersion and emulsion polymerization.Hydrolyzed cellulase shows unique colloidal properties,which can improve the stability of dispersion and emulsification system through charge and steric effect.When hydrolytic cellulase and SDS coexist in aqueous solution,they can form stable association through the interaction of hydrophobic force and hydrogen bond force.Because of their molecular size and complementary structure and performance,they will have synergistic effect on the dispersion and emulsification of organic pigment and adhesive monomer.Based on this effect,the dispersion and fixation system of ultrafine copper phthalocyanine?CuPc?pigment with excellent performance can be prepared.Firstly,the effect of hydrolysis on cellulase protein was studied.After hydrolysis,the molecular size and molecular weight of cellulase decreased,but the zeta potential changed little.The results of UV,fluorescence,XRD and FT-IR showed that the molecular conformation of cellulase changed.The association between hydrolytic cellulase and SDS was further confirmed and explained by H¹ NMR,UV and fluorescence spectra,indicating that the association may play an active role in pigment dispersion and monomer emulsification system.Secondly,the synergistic dispersion properties of cellulase/SDS for CuPc pigment were tested.The best dispersibility was determined when the mass ratio of the two was 9:1by measuring the transmittance and the particle size of the dispersion.The viscosity and zeta potential of the dispersion were measured.The stability test shows that the dispersion of CuPc based on hydrolytic cellulase/SDS has higher Ca²⁺resistance and acid alkali stability.The results of TGA and FT-IR showed that the hydrolytic cellulase/SDS association complex adsorbed on the surface of CuPc pigment,and XRD showed that the crystal form of CuPc pigment based on the synergistic dispersion of association complex did not change.Then,the synergistic emulsification properties of hydrolyzed cellulase/SDS to butyl acrylate?BA?and styrene?St?monomer were analyzed by stability and emulsion particle size test.The St-BA copolymer adhesive system was prepared by emulsion polymerization.The monomer conversion and the size distribution,Zeta potential and stability of the binder emulsion were characterized.The infrared spectrum and glass transition temperature of the binder system were also tested.Finally,the adhesive system based on hydrolytic cellulase/SDS was applied to the dyeing of cotton fabric pigment to test its influence on the dry and wet rubbing fastness and soaping fastness of pigment fixation.The results showed that the copolymer adhesive system had excellent fixation performance.