The ambient self-crosslinkable polyacrylate latexes with sealed function were synthesized by semi-batch seeded emulsion polymerization with diacetone acrylamide (DAAM)

methyl acrylate (MMA)

methacrylic acid (MAA) and butyl acrylate (BA) as co-monomers.The effects of DAAM and multiple emulsifiers on the emulsion polymerization stability and film performance were investigated.The results indicated that the emulsion polymerization stability decreased and the particle size of latex increased with increasing amount of DAAM

while the crosslinked degree of cured film increased and the water- or alcohol-resistance properties of cured film were improved.The optimal DAAM dosage was 3.0% (mass) and the molar ratio of DAAM to adipic dihydrazide (ADH) was 2∶1. On the other hand

the emulsion polymerization displayed high stability (low agglomeration and high monomer conversions)

polyacrylate latexes exhibited good electrolyte stability

and its cured films possessed excellent sealed function.Sodium dodecyl sulphonate(SDS)

nonyl phenol ethoxylates (OP-10) and OP-40 were used as multiple emulsifiers with 2.35% (mass) of the optimal dosage

the mass ratio of SDS to OP-10 and OP-40 was 1∶1.25

and the mass ratio of multiple emulsifiers dosages in seeded

core and shell was 1.5∶1∶2.The FTIR spectrum showed that the ketone carbonyl groups of DAAM reacted with hydrazide groups of ADH to form hydrazone (C=N) during film formation.TEM picture showed that the structures of particles were core and shell

and TGA curves indicated that the thermal stability of cured film decreased

which was attributed to the presence of C=N groups.