关键词: 聚天冬氨酸酯, 磺酸盐, 聚脲分散体

Abstract:

Aspartic ester dimer (AE）was synthesized by Michael addition reaction between maleic acid dibutylester (DBM）and 1, 6-hexamethylene diamine (HDA).Then AE reacted with 1, 6-hexamethylene diisocyanate (HDI）to make polyaspartic ester (PAE), which contained hydantoin groups and secondary amine.Sulfonate polyurea dispersions (PUD）were prepared from N-(2-aminoethyl)-2-amino ethanesulfonic sodium (AAS）as the hydrophilic monomer, PAE, isophorone diisocyanate (IPDI）and ethylenediamine (EDA）by the acetone method.The structures of AE and PAE were confirmed by FT-IR spectroscopy.The Zeta potentials of polyurea dispersions were between -48 mV and -58 mV, and PUD displayed good stability.As the content of hydrophilic monomer increased, the viscosity increased while the average particle size decreased.TEM analysis showed that the morphology of the particles were spherical with different sizes.The results of tension test showed that the ultimate elongation of PUD films were more than 450%.Shore hardness was between 40 and 50.TGA showed that the initial decomposition temperature of polyurea film was around 200℃, and complete decomposition was basically at 450℃.

Key words: 聚天冬氨酸酯, 磺酸盐, 聚脲分散体