| Acrylate polymer latexes have been widely used as waterborne coatings, and have many excellent properties, including good film appearance, high gloss, transparency, and good mechanical properties. However, they have many drawbacks, such as poor water/solvent resistance, poor weather resistance, and low hardness. In order to obtain polyacrylate coatings with excellent performance, people have paid great attentions to the modification of polyacrylate latexes. In this paper, polyacrylate emulsions were modified by inorganic SiO2 sol to prepare inorganic-organic composite emulsions, and the performance of the composite emulsions and their films were also studied.This thesis is composed of the following sections.1. The silica sol was modified by hydrogenated silicone oil. The effects of the amount of hydrogenated silicone oil, the pH value of the reaction mixture, and the reaction temperature and time on the reactions of the modified silica sol were studied. The modified silica sols with good stabilities were prepared and characterized by infrared spectroscopy.2. The inorganic-organic core-shell poly(acrylate/nano-silica)hybrid latex have been prepared via seeded emulsion polymerization of acrylate monomers and silicone sol. The effects of monomers, emulsifier, initiator, and the amounts of the modified silica sols on the properties of hybrid emulsions were studied.3. The inorganic-organic core-shell poly(acrylate/nano-silica) hybrid latex films were prepared and characterized by IR, SEM, TGA and DSC experiments. The results showed that the hybrid emulsions have good film properties and the hybrid films have good thermal stabilities. |
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