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Preparation and Properties of Waterborne Polyurethane Containing Fluorenyl |
Received:August 20, 2021 |
DOI:10.11980/j.issn.0254-508X.2022.02.007 |
Key Words:bisphenol fluorene 9,9-bis[4-(2-hydroxyethoxy)phenyl] fluorene waterborne polyurethane heat resistance mechanical properties |
Fund Project:陕西省教育厅重点实验室计划项目(17JSO11)。 |
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Abstract:The modified waterborne polyurethane emulsions(WPUS and GWPUS)were prepared by modifying the waterborne polyurethane pre-polymers which were synthesized with poly(caprolactone glycol)(PCL2000)and isophorone diisocyanate(IPDI)as raw materials, dihydroxy methyl propionic acid(DMPA)as hydrophilic chain extender, and bisphenol fluorine (BPFL) and self-made 9,9-[4-(2-hydroxyethoxy)phenyl] fluorine as modifiers, respectively. The structure and properties of the waterborne polyurethane film were characterized. The results shown that compared with WPU, the maximum tensile strength of WPUS and GWPUS films were 42.54 MPa and 32.82 MPa, the maximum elongation at break were 711.83% and 586.95%, and water resistance increased by 32.58% and 45.81%, respectively. When the film was 90% decomposed, compared with WPU film, the decomposition temperature of WPUS and GWPUS film increased by 33.16% and 54.38%, respectively. After surface sizing, compared with WPU paper, the folding endurance of unaged WPUS and GWPUS papers increased by 37 and 41 times while that of the aged counterparts increased by 14 and 19 times ; the tensile strength of unaged WPUS and GWPUS papers increased by 33.57% and 40.82%, while that of the aged counterparts increased by 24.20% and 33.24%. |
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