Deng Guang-x
2015
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Journal
Journal of Chemical Engineering of Chinese Universities
Abstract
A new hydrophilic sulfonate monomer, 2,2-bis(hydroxymethyl) butyric propyl-3'-sodium sulfonate(DMBPS-Na), was synthesized by sulfo-alkylation reaction between 2,2-bis(hydroxymethyl) butyric acid sodium salt and 1,3-propane sultone. The structure of DMBPS-Na was further confirmed by FT-IR, 1H-NMR, 13C-NMR, EIS-MS and elemental analysis. The melting point of the prepared DMBPS-Na is 85~90℃. It is soluble in water, ethanol, and dimethylacetamide(DMAC). It is slightly soluble in acetone or ethyl acetate. By using DMBPS-Na as hydrophilic monomer and PTMG-2000, IPDI and EDA as raw materials, the sulfonic type polyurethane dispersions(PUDs) with solid content above 50% were successfully synthesized through acetone process. The results from a performance test show that the average particle size of PUDs is 122.3 nm, the Zeta potential is ?66.39 m V, the viscosity is 475 m Pa?s and the PUDs is stable when the content of DMBPS-Na is 8 mmol?(100 g)?1. The PUD colloidal particles have a spherical shape with bivariate distribution. The tensile stress of PUD films exceeds 10 MPa and the tensile strain at breaking point is about 1160%. The initial decomposition temperature of PUD films is about 270℃ and the fire decomposition is completed at 490℃.