An emulsifier-free core–shell polyacrylate/diacetone acrylamide emulsion with nano-SiO2 for room temperature curable waterborne coatings
writer：Rong-Min Wang, Wei-Hua Lv, Yu-Feng He, Yan Wang,Jun-Feng Guo
keywords：emulsifier-free emulsion polymerization; waterborne coatings; copolymerization; core–shell polymers; nano-SiO2; diacetone acrylamide
source：期刊
specific source：Polym. Adv. Technol. 2010, 21 128–134
Issue time：2010年
An emulsifier-free core–shell polyacrylate emulsion, containing nano-SiO2 nanoparticles in the core and diacetone acrylamide (DAAM) in the shell, has been successfully prepared by emulsifier-free seeded emulsion polymerization.
The effects of reaction temperature, dropping time, nano-SiO2 and initiator contents, and variation of the composition of core monomers on the amount of coagulum, particle size, and monomer conversion have been investigated. The particle morphology and the distribution of emulsion particles have been measured by transmission electron microscopy (TEM) and dynamic light scattering. The keto-carbonyl groups on the surface of the polyacrylate emulsion nanoparticles reacted with adipic dihydrazide (ADH) to form a film with a cross-linked network structure at room temperature. Therefore, the emulsifier-free core–shell emulsion could be used as a two-component room temperature curable waterborne coating. It was also found that the properties of the coating were clearly superior after using the
cross-linker.