期刊
POLYMER
卷 47, 期 6, 页码 1805-1811出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2006.01.074
关键词
polyurethane dispersion; acetone process; compositional variations
There are many variables in the preparation of aqueous polyurethane (PU) dispersions. Chemical and compositional variables such as carboxylic acid concentration, concentration of the polymer, degree of pre/post-neutralization of the carboxylic acids and chain extension that all impact solution properties such as particle size and viscosity. Another variable is the method by which the dispersion is prepared; two primary methods are currently employed in industrial manufacture, the prepolymer mixing process and the acetone process. This study evaluates the impact of the chemical variables on a given PU dispersion formulation prepared by the acetone process. Chances in carboxylic acid concentration, degree of pre/post-neutralization and chain extension were found to have the expected impacts oil dispersion solution properties. Increased ionic concentration, and degree of pre-neutralization led to lower particle size and higher viscosity, increased degree of chain extension led to larger particle size and lower viscosity, increased post-neutralzation increased both particle size and viscosity, and increased concentration of the polymer led to a viscosity increase without any change in particle size. (c) 2006 Elsevier Ltd. All rights reserved.
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