Design, Preparation and Properties of Polyurethane Dispersions via Prepolymer Method.

ABSTRACT: A waterborne polyurethane dispersion for foamed synthetic leather base was designed and prepared using prepolymer method. There are many variables in the emulsification and chain-extension process of waterborne polyurethane (WPUR) dispersions prepared by prepolymer method. This work thoroughly evaluated the impacts of the steps of adding emulsified water, the temperature of the prepolymer and emulsified water, and concentration of ammonia water on WPUR dispersions by investigating the particle sizes/distributions and the mechanical stability. Changes in the temperature of the prepolymer and emulsified water, the concentration of ammonia water, and the step of adding emulsified water showed great impacts on the appearance and particle size of dispersions. Decreasing the temperature of the p

SUBMITTER: Sun L 

PROVIDER: S-EPMC9863305 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature