Preparation Of Core-shell Pigment Particles And Study Of Ink Absorption Performance

In the course of developing inkjet printing market, the world’smajor manufacturing company on inkjet photo paper, have committed to high-techresearch and development. As the late start in inkjet paper research and the technologyis relatively backward, it is urgent to do independent research and development tomeet the requirement of the high performance inkjet photo paper material. Based on thisbackground, this thesis designed a method for producing a new type of multi-functionpaper pigment particles.The thesis focused on preparing nano-composite particles SiO₂/TiO₂, studyingthe way to control the size of the composite particle, and discussing the formation ofcomposite particles. Besides, the author prepared the in-receiving layer usingthe composite particles as pigment particles, researched the performance and furtherstudied the absorption and diffusion rate of the layer with the edge detectiontechnology. The main contents are as follows:The author prepared the nano-silica using the sol-gel, and used it to prepare thecomposite particles. By changing the amount of the tetrabutyl titanate （TBOT）, water,the duration of reaction and the size of nano-silica core particles during the preparation,the factors of influencing the variation of the size of composite particles studied. Inaddition, in order to know the performance of UV resistance, the resolution, and theabsorbing rate of the corresponding layer, She prepared the ink-receiving layer bymixing the composite particles （as the pigment particles） and polyvinyl alcohol（PVA） inproportion, and finished the contrast with the commercialized layer. She recorded thediffusion of a drop of ink in the layer using a microscope processed the video capturebythe edge detection technique, analyzed the absorbing of the ink in different stages.The samples were characterized by the following conclusions:Studies have shown that the distribution of nano-silica particles was relativelynarrow when the amount of ammonia was25ml, the size of the composite particlebecame larger with the increasing of TBOT and water consumption, and the duration ofreaction, and the influence of changes in nuclear size on the composite particle size waslittle. The water in the solution formed a aqueous layer on the surface of on the coreparticles, and then the reactant TBOT spread to the aqueous layer of silica particles, andfinally a core-shell structure of nano-composite particles formed. The nano compositeparticles prepared with1.5g distilled water and0.12g TBOT for8hours had steady performance and narrow particle size distribution. The ink-receiving layer prepared bythese particles had high resolution, proper ink-absorbing rate and UV resistanceespecially when compared with commercialized ink-receiving layer. The process of inkabsorbing could be divided into two by applying edge detection. The respectiveequation of ink absorbing are as follows: y₁=5xA+B （0<A <1,0<B） and y₂=Cln （x）+D （0<C,0<D）. The rate of diffusion of ink-receiving increased with the increasing ofC.