Preparation And Study On Properties Of Acrylic Resin/CaCO₃ Nanocomposites

The polymer/inorganic nano-composites is a nanometer material which is an important application value new material, and this kind of material have the advantage of organic macromolecular and inorganic nanometer material. Nanometer CaCO₃ is an important functional inorganic filling material, widely applied to industry fields of plastic, rubber, coatings, papermaking, and so on. At present, the main method of preparing polymer /CaCO₃ nano-composites is as follow: firstly the surface of nanometer CaCO₃ is modified by silane coupling agent or titanate coupling agent, then blended with PVC, or in-situ disperse polymerization after surface modification to obtain. But it hasn't been reported that the nanometer CaCO₃ was prepared without the surface active agent directly, either has applied nanometer micro-emulsion to modify nanometer CaCO₃.This thesis has summed up the synthesis methods and applications of polymeric organic-inorganic nano-composites. We used the in-situ synthesis method to synthesize Acrylic resin/ CaCO₃ nano-composites without any surface active agent. The high solid content Pure-acrylate micro-emulsion was synthesized by way of micro-emulsion polymerization. We used market pure-acrylate emulsion and the self-made pure-acrylate micro-emulsion to modify nanometer CaCO₃, then blended with polyvinyl chloride (PVC) to prepare PVC/CaCO₃ nano-composites.The structure and properties of nanocomposites were investigated by XRD,FT-IR,UV-Vis,SEM and TG.. The experimental result indicated that, along with the inorganic composition content increase, the particle size distribution gradually changes in a big way, when the inorganic component quality is 3% 8%, the nanocomposites particle size could be controlled in 100nm, also the thermal stability remarkably enhanced. The structure and the properties of modified nanometer CaCO₃ and PVC/CaCO₃ nano-composites were investigated.The experimental result indicated that the effect of modified nanometer CaCO₃ self-made pure-acrylate micro-emulsion is better than market pure-acrylate emulsion. Modified nanometer calcium carbonate can evenly disperse in PVC. When modified nanometer calcium carbonate add to PVC in the quantity is 10%, overall properties of PVC/CaCO₃ nano-composites is the best.