Modification Of The Pigment Particles And The Polymerization Toner Preparation

For the purpose of overcoming the deficiency of fabricating toner by means of pulverization, this article aims to describe the particle size distribution, appearance features and glass transition temperature obtained by means of suspension polymerization, dispersion polymerization for fabrication of toner, mastersizer instrument, scanning electronic microscope (SEM) and characterization of differential scanning calorimetry (DSC). On the basis of fabricating toner by means of polymerization, silane coupling agent and titanate coupling agent are used to perform surface modification to pigment particle. The effect of modification technics on modification results is discussed in this paper and the modification effect is characterized here. At the same time, this article also introduces the composite toner added with charge control agent (CCA) in an attempt to ensure that the toner may have a better charge property. Also, tests and characterizations are made on the particle size, particle shape and glass transition temperature of composite toner.According to the result of research, the suspension polymerization is capable of producing spheroid toner with mean diameter below 10 μm and narrow particle distribution. The mean particle diameter of toner produced by means of dispersion polymerization is smaller than that of the toner produced by means of suspension polymerization. However, toner produced by means of dispersion polymerization has a wide distribution of particle diameter, and is mingled with resin micro-balls which may restrict the application of dispersion polymerization to produce the toner. Coupling agent modification can strengthen the compatibility and dispersion of carbon black in monomer and resin. The surface of toner produced with the carbon black modified with the titanate coupling agent and by means of suspension polymerization has notable reduction of collective carbon black and is smoother than that of the toner produced with unmodified carbon black. By adding the CCA, it will be available to produce spheroid composite toner with relatively uniform appearance by means of suspension polymerization. However, the mean particle diameter of the toner product is bigger than that of the product added with CCA, and the distribution of particle diameter is much wider. The glass transition temperature of the three toners respectively produced by means of suspension polymerization, dispersion polymerization and the suspension polymerization with the addition of CCA is without exception lower than that of the commercial toner produced by means of...