The Preparation Of Polymer Particles Via Emulsion Polymerization And Physical Agglomeration

As a kind of polymer material or composite polymer material, polymer particle is very popular,with its diameter ranges from nanometers to micrometers.The most idea shape of it is sphericity, of course, it also can be other shapes. Owing to its distinctive properties, polymer particles can be applied to far-ranging fields, such as in additives, pharmaceuticals, building materials, biological engineering, laser printing and so on. What is more important is that its application areas are gradually moving from the ordinary fields of industry to the sophisticated technique areas and its research and preparation has stepped into a dynamic climax.In this article we prepared styrene-acrylic latex with different sizes via emulsion polymerization, and added the BXSY monmer which has high adhesiveness to improve the compatibility of the adhesive resin which is the most component of toner. At last we conducted physical agglomeration to prepare the initial toner. Different from other processes, the form of the toner we prepared is powder at the beginning. However, most of other processes need mixing, melting, cooling, grading. Besides, relative to the chemical method, the pigment particles can be used directly, wich is more conducive to industrialization.The size and distribution of emulsion microspheres impact significantly on the final product particles, especially in the morphological distribution. If the initial particle size distribution of emulsion microspheres is bimodal, so is the distribution of the final product.The size and distribution of final product also depend on the agglomeration time, agglomeration temperature, stiring intensity. For the ST/BA/BXSY system, the optimum temperature is30℃, the best time is1.5h. And for the BXSY system, the optimum temperature is60℃, the best time is1.0h. The most idea stirring form is R1312stirring mode. Besides, the higher of the physical polymerization tempretaure is, the easily the final product will be dried. The larger the paiticle is, the faster the final product will be dried. During drying process,9200stabilizer can effectively avoid agglomeration between the large particles, which can make the particle size of the final product be same as the initial product.We used BT900ranulometer, IR, DSC, GPC and other methods to characterizate the product. The results showed that the particle size and distribution is suitable, the glass transition temperature is ideal, and the molecular weight of the final product is up to standans. Compared to the toner made in Japan, our product also has high competivieness.Namely, the work we have done is meaningful.