Preparation And Electrolyte Agglomeration Of Multi-Component Colored Latex Particle

In this paper,the composite particles of styrene-acrylic resin encapsulated C.I.Pigment Yellow 12(PY12)and C.I.Pigment Blue 15:3(PY15:3)were successfully prepared by in-situ emulsion polymerization and mini-emulsion polymerization,respectively.The effect of different mini-emulsification methods on the properties of styrene-acrylic resin encapsulated PY12 composite particles was studied.The multi-component composite particles of styrene-acrylic coated PY12 and oxidized polyethylene(OPE)wax were successfully prepared by mini-emulsion polymerization.Nano-scale composite particles became micron-sized particles that meet the needs of color toners by electrolyte coagulation method.The performance of nano-scale composite particles were analyzed by transmission electron microscopy,fourier transform infrared spectroscopy,differential thermal gravity,dynamic light scattering,differential scanning calorimetry,color-eye automatic differential colorimeter,UV-visible spectrophotometer and X-ray diffractometer.The properties of the micron-sized particles obtained after the aggregation were characterized using optical microscope,scanning electron microscope and laser particle size analyzer.The results of the study could be summarized as follows:The emulsion of styrene-acrylic resin encapsulated PY12 and PY15:3 obtained by in-situ emulsion polymerization began to fade at about 7 days,obvious stratification at 14 days and layered completely at 30 days,but the emulsion obtained by the mini-emulsion polymerization did not change from the previous groups at 30 days.PDI values of the composite particles prepared by in-situ polymerization and mini-emulsion polymerization were 0.367 and 0.195,respectively.The TEM images also showed that the latex particles prepared by mini-emulsion polymerization had a more uniform particle size.These indicated that the composite particles prepared by mini-emulsion polymerization were more stable and homogenous.The effect of different mini-emulsification methods on the properties of styrene-acrylic resin encapsulated PY12 composite particles was studied.When the room temperature of ball milling was 35?,PY12 particles could remained the original crystalline state.When the room temperature of ball milling was 15?,PY12 particles were basically transformed into amorphous.When PY12 was crystalline,the amount of pigment and monomer had a significant effect on the morphology of the composite particles.When PY12 was amorphous,the particle size and the core size of the composite particles obtained by ultrasonic emulsification were both larger than the high-shear shear emulsification,and ultrasonic emulsification dispersed more uniformly.As the amount of PY12 increased,the thickness of the resin shell became thinner.The composite particles obtained by the ultrasonic method had a better encapsulation efficiency than the composite particles obtained by the high-speed shear method,and its had good acid resistance.When the PY12 content of the encapsulated particles was 0.6 g,the lightness value(L*)and yellow value(b*)of the sample reached the maximum,the color performance was the best,and had a potential application value in the field of anti-UV aging.It was found that the positive and negative charge of emulsifier and OPE wax emulsions had unique effects on the stability of the emulsion and the coating effect in the experiments of styrene-acrylate coated PY12 and OPE wax.Through the analyses of TEM images,infrared spectra and TG curves,it could be concluded that the anionic composite emulsifier was better than the cationic composite emulsifier in the coating effect.It was confirmed that the glass transition temperature of composite latex particles was 52 ? in the electrolyte aggregation experiment.When the amount of emulsion was 20 ml,the dispersibility,particle size and the amount of final product of the whole coagulation system were the best.When the optimum consolidation temperature was 54?,the consolidation time of 60 minutes is more appropriate.When the best ripening temperature was 66 ?,the best ripening time was 60 min.