Synthesis And Application Of Alkali Soluble Acrylic-Styrene Resin

As the environmental protection agency ,water-based ink and water-based coatings have been given more focus in recent yeas and the high performance resin is sorely needed to apply to water-based system of them. Water-borne styrene-acrylic resin is just the kind of resin, characterized by low molecular weight , narrow molecular weight distribution and hydrophile-lipophile function, with high acid value, average molecular weight between 6,000 to 15,000 ,especially between 6,000 to 10,000.In the paper water-borne styrene-acrylic resin was synthesized through semi-batch solution polymerization process, adoptingα-methyl styrene(AMS) as one of the reaction monomers. It was found that the addition of AMS improved the structure of the resin, which improved the properties of resin in application of water-based ink and water-based coatings. The amount of addition had an optimal range which was determined by a series of research.The average molecular weight and molecular weight distribution index (PDI) are the main factors affecting the dispersion ability of the water-borne styrene-acrylic resin, which are sensitive to the polymerization conditions,such as changes of solvent , molecular regulator, type of initiators, temperature. The N,N-Dimethylformamide(DMF) was chosen as the reaction medium and had an advantage over the regular solvent, such as alcohols and ether. Finally, the optimum technological condition was determined, including the best reaction temperature, the optimum concentration of initiator(TBPB) and molecular regulator.Under the optimum technological conditions, the styrene-acrylic acrylic resins which is modified or unmodified were applied in water-based colorants and pigment color filters. This paper investigated viscosity of solution, fineness of colorants, the dispersion stability and storage stability of carbon black pigment in the water-based colorants. It also investigated the water solubility of pigment color filters by methods of the oscillating agitation and the ultrasonic dispersed , which were made by different types of styrene-acrylic resin The experimental date shows that some modified styrene-acrylic acrylic resins had better application property, close to the standard sample.