Synthesis And Application Of Cationic Silicon Modified Core/Shell Polyacrylate Emulsion

The paint dyeing process is simple,suitable for all kinds of fiber dyeing,and does not need to be washed after dyeing.It is an environmental friendly dyeing process.At this stage,most domestic paint dyeing adhesives are polyacrylate emulsions,but polyacrylate emulsions have the disadvantages of poor rubbing fastness,high temperature stickiness,and low temperature brittleness.Polysiloxane has the advantages of good heat resistance and flexibility.By modifying polyacrylate with silicone,it is possible to synthesize an adhesive with good adhesion and film formation.Therefore,this experiment uses self-made acrylate-terminated polysiloxane and acrylate monomers as materials to prepare core/shell silicon-modified cationic polyacrylate emulsion adhesives,and uses the synthesized modified emulsion as the adhesive used in the paint dyeing of cotton fabrics.The main research content of the paper is as follows:The first part is the synthesis of cationic polyacrylate emulsion.In this experiment,methyl methacrylate,butyl acrylate,etc.are used as polymerization monomers,by emulsion polymerization,the synthesized cationic polyacrylate emulsion has good emulsion stability and high monomer conversion rate.The second part is the synthesis of acrylate-terminated polysiloxane and the synthesis of core/shell silicon modified cationic polyacrylate emulsion adhesive.In this experiment,the epoxy-terminated polysiloxane was selected.Through the ring-opening reaction with acrylic acid,the acrylate-terminated polysiloxane was synthesized;the analysis result of the infrared spectrometer showed that the epoxy-terminated polysiloxane had a ring,the ring-opening reaction of the oxygen structure occurs chemically bonding with acrylic acid to synthesize acrylate-terminated polysiloxane.Using self-made acrylate-terminated polysiloxane and acrylate monomers as materials,the core/shell silicon-modified cationic polyacrylate emulsion is synthesized through core-shell structured particle design.Studies show that the prepared core/shell silicon modified cationic polyacrylate emulsion has good stability and low gel rate;the microstructure and particle size of the emulsion are measured by transmission electron microscope,nano-particle size analyzer,and infrared spectrum analyzer.The analysis results show that the experiment has successfully synthesized core/shell silicon modified cationic polyacrylate emulsion,the average particle size of the emulsion is small,the particle size distribution of the emulsion is narrow,and the emulsion has obvious core/shell structure;by X-ray atomic energy spectrometer and universal testing machine test and analysis show that the surface silicon content of the synthesized modified emulsion is higher after film formation,which indicates that the core/shell structure of the modified emulsion with core-shell structure changes during film formation.The third part is the application of core/shell silicon modified cationic polyacrylate emulsion as binder in the dyeing of cotton fabrics.This part mainly explores the influence of the amount of acrylate-based polysiloxane in the adhesive,the amount of synthetic emulsion,the baking temperature and time on the dyeing performance of cotton fabric coatings.The results of the study show that the dyed cotton fabric has soft hand feel and good rubbing fastness,the dry rubbing fastness shell is 4～5 grade,the wet rubbing fastness is 4 grade,and finally the core/shell type silicon modified cationic polyacrylate adhesive is bonded with the commercially available cationic Comparative analysis with agent 6218 shows that the fastness indexes of the paint-dyed cotton fabric treated by the modified emulsion adhesive are similar to those of the adhesive 6218,but the fabric feel is better than the adhesive 6218.Therefore,the modified emulsion adhesive Adhesives have good market application prospects.