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Preparation, Characterization, and Performance Regulation of Bio-based Degradable Waterborne Polyurethanes
Received:October 17, 2022  
DOI：10.11980/j.issn.0254-508X.2023.04.009
Key Words:PLA  performance adjustable  biodegradable  WPU
Fund Project:陕西省科技厅自然科学基础研究计划项目（2019JM-555）；咸阳市科技计划项目（2018K02-14）。
Author NameAffiliationPostcode
LI Ting National Demonstration Center for Experimental Light Chemistry Engineering Education， College of Bioresources Chemical and Materials Engineering， Shaanxi University of Science and Technology， Xi’an， Shaanxi Province， 710021 710021
FENG Jianyan* National Demonstration Center for Experimental Light Chemistry Engineering Education， College of Bioresources Chemical and Materials Engineering， Shaanxi University of Science and Technology， Xi’an， Shaanxi Province， 710021 710021
CHEN Xin National Demonstration Center for Experimental Light Chemistry Engineering Education， College of Bioresources Chemical and Materials Engineering， Shaanxi University of Science and Technology， Xi’an， Shaanxi Province， 710021 710021
KAN Chengyou Department of Chemical Engineering， Tsinghua University， Beijing， 100084 100084
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Abstract:Polylactic acid （PLA）-based waterborne polyurethane （PLA-WPU） and polycaprolactone （PCL）-based waterborne polyurethane （PCL-WPU） were first prepared by internal emulsification， respectively， and then the bio-based degradable waterborne polyurethane emulsion （PLA-WPU-PCLX） was prepared by physical blending of PCL-WPU and PLA-WPU. The results showed that when the PCL-WPU content was 30%， the comprehensive performance of the prepared PLA-WPU-PCL30 was better， the crystallization performance was significantly improved compared with pure PLA-WPU and PCL-WPU， the tensile strength reached 22.2 MPa， the elongation at break was 540%， the initial thermal decomposition temperature was 290.5 ℃， and the mass loss rate after 14 days of compost degradation was 2.4%. After surface sizing， the contact angle of the paper increased from 99° to 112°. Compared with starch sizing，when the dosage of PLA-WPU-PCL30 was 5%， the paper sizing degree increased from 16 s to 71 s， the Cobb value decreased from 68.4 g/m2 to 44.7 g/m2， the tensile strength increased from 4.6 kN/m to 5.4 kN/m， the tear index increased from 1.32 mN·m2/g to 1.42 mN·m2/g， the bursting strength increased from 235 kPa to 273 kPa， and the folding endurance increased from 55 times to 146 times.
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