Preparation and Properties Study of High Inorganic-Organic Ratio Composite Emulsion
|School||Beijing University of Chemical Technology|
|Keywords||Organic - inorganic composite emulsion Polyacrylate Sol Water-based paint Core - shell structure|
This article situ emulsion polymerization method for synthesis of a high silica content , high inorganic / organic polyacrylate / silica sol organic / inorganic hybrid emulsion study Inorganic / organic ratio of composite emulsion stability , the composite emulsion coating hardness composite emulsion coating film such as water resistance . By Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy ( TEM ) , the dynamic laser scattering particle size meter ( DLS ) , differential scanning calorimetry analysis ( DSC ) , thermogravimetric (TGA) , etc. by means of the microscopic structure of the composite particles . characterization , and initial exploration in the application of latex paint . The main work as follows: 1. Inorganic / organic composite emulsion and its film properties and found that the storage stability of the emulsion is reduced as the system of the inorganic / organic ratio increases , while the calcium ion stability Of the opposite. The hardness of the coating film , heat resistance, with an inorganic / organic ratio increases , the silica may be introduced within a certain range to improve the water resistance of the system . From a combination of factors to consider , the latex particles in the system of inorganic / organic hybrid emulsion ratio should not be more than 0.9002 . Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy , and other means of testing , analysis contains two kinds of core - shell wrapped structure , which contains more structure : SiO 2 particle shell polyacrylate latex particles as the core-shell structure of the nucleus . The presence of a bond between the core-shell structure . In addition to the core-shell structure composite emulsion , free silica particles . By dynamic laser light scattering particle size analyzer test , it was found that the the emulsion obtained composite latex particle size is between 84 ~ 86nm , and narrow particle size distribution . Differential scanning calorimetry analysis showed that the hybrid composite latex can reduce the glass transition temperature , and expanding the use temperature range of the composite emulsion . Obtained composite emulsion is applied to the latex paint , the paint performance tests show , compound emulsion latex paint in stain resistance and other aspects are more advantages , potential research value , pending further study on the the emulsion performance and coating formulations .