Synthesis And Properties Of Soap-free Nano-size Emulsion Polymerization Of Acrylates

A new polymeric surfactant for acrylate waterborne coatings was prepared by monomers ZD,styrene,hydroxyethyl acrylate and 2-Ethylhexyl acrylate.Structure of copolymer was signified by FT-IR.It was measured that, apparent viscosity of copolymeric solution were at the range of 100～630 mPa·s, critical glue bunches of density(CMC) appeared lower(4g/L～9g/L),and the minimum surface tension reaches 31.5 mN/m(25℃).An soap-free acrylate emulsion with 40%solids content was synthesized by technology of continuous emulsion polymerization,inwhich using the new polymeric surfactant as emulsifier.And average particle size was characterized as 90nm by using TEM.Super emulsified properties have been studied at the optimized reaction condition: polymerization temperature 90℃,amount of initiator 1.0wt%,amount of polymeric surfactant 7wt%,whisking velocity of 200～250r/min.In corporation of crosslinking agent ZrO²⁺ will lead the chelation crosslinking between carboxylicion and metalion, which shows its pencil hardness 2H and water resistance over 72 h when adding n(ZrO²⁺):n(-COOH) =1:2 to soap-free acrylate emulsion.An ambient Crosslinkable soap-free nano-size acrylic polymer emulsion was obtained by adding adipic acid dihydrazide(ADH) to the acrylic polymer emulsion incorporated with diacetone acrylamide(DAAM).The results obvious showed that the apparent viscosity increased with increasing the DAAM content.It was reviewed that emulsion is stable after 6 month,Coagulation small,pencil rigidity 2H,and the water absorption 2.5%,with DAAM content 6wt%of latex films.