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Study on thermal-storage stability of polyurethane dispersions prepared via Prepolymer method.

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Title: Study on thermal-storage stability of polyurethane dispersions prepared via Prepolymer method.
Authors: Jiang, Hongmei1 (AUTHOR), Sun, Lijuan1 (AUTHOR) sun.lijuan@huafeng.com
Source: Journal of Polymer Research. Aug2025, Vol. 32 Issue 8, p1-11. 11p.
Subjects: Polyurethanes, Prepolymers, Fabrication (Manufacturing), Heat storage, Viscosity
Abstract: In order to explore the thermal-storage stability of waterborne polyurethane (WPU) fabricated by prepolymer method, a series of WPUs were prepared with polyether polyol (PPG), aliphatic isocyanate (IPDI), dimethylol propionic acid (DMPA), 1, 4-butanediol (BDO), triethyl amine (TEA) and hydrazine hydrate (HyHy). Effects of -NCO content of prepolymer, ratio of [NCO] to [H] after post-extension, HyHy dilution ratio and adding time, and solid content of WPU, were detailedly investigated. The viscosity and appearance of WPUs were used to characterize the stability during the thermal-storage process. Decreasing the -NCO content of prepolymer, ratio of [NCO] to [H] after post-extension and solid content (SC) of WPUs, viscosity rise for WPUs in thermal-storage process decreased significantly; increasing the dilution ratio of H2O to HyHy and prolonging the addition time of HyHy aqueous solution in the post-extension process, WPUs with stable viscosity under thermal-storage environment could be obtained. The mechanism for thermal-storage stability affected with "cage effect" was proved. The systematic study on the influencing factors and mechanism of thermal-storage stability in this study is of great significance to the understanding of prepolymer method and to promote the industrialization of WPUs via prepolymer method. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In order to explore the thermal-storage stability of waterborne polyurethane (WPU) fabricated by prepolymer method, a series of WPUs were prepared with polyether polyol (PPG), aliphatic isocyanate (IPDI), dimethylol propionic acid (DMPA), 1, 4-butanediol (BDO), triethyl amine (TEA) and hydrazine hydrate (HyHy). Effects of -NCO content of prepolymer, ratio of [NCO] to [H] after post-extension, HyHy dilution ratio and adding time, and solid content of WPU, were detailedly investigated. The viscosity and appearance of WPUs were used to characterize the stability during the thermal-storage process. Decreasing the -NCO content of prepolymer, ratio of [NCO] to [H] after post-extension and solid content (SC) of WPUs, viscosity rise for WPUs in thermal-storage process decreased significantly; increasing the dilution ratio of H2O to HyHy and prolonging the addition time of HyHy aqueous solution in the post-extension process, WPUs with stable viscosity under thermal-storage environment could be obtained. The mechanism for thermal-storage stability affected with "cage effect" was proved. The systematic study on the influencing factors and mechanism of thermal-storage stability in this study is of great significance to the understanding of prepolymer method and to promote the industrialization of WPUs via prepolymer method. [ABSTRACT FROM AUTHOR]
ISSN:10229760
DOI:10.1007/s10965-025-04477-y