首页|The influence of the NCO/OH ratio and the 1,6-hexanediol/dimethylol propionic acid molar ratio on the properties of waterborne polyurethane dispersions based on 1,5-pentamethylene diisocyanate

The influence of the NCO/OH ratio and the 1,6-hexanediol/dimethylol propionic acid molar ratio on the properties of waterborne polyurethane dispersions based on 1,5-pentamethylene diisocyanate

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1,5-Pentamethylene diisocyanate,a novel aliphatic diisocyanate formed from bio-based 1,5-pentamethylenediamine,has been used as a hard segmented material to synthesize polyurethane.In this study,several waterborne polyurethane (WPU) dispersions have been successfully prepared by a prepolymer process from 1,5-pentamethylene diisocyanate poly(polyether) with different NCO/OH ratios and 1,6-hexanediol (HDO)/dimethylol propionic acid (DMPA) molar ratios.The Fourier transform infrared (FTIR) spectra,thermogravimetric analysis,differential scanning calorimetry,X-ray diffraction,and a mechanical tensile test were used to investigate the structures,thermal stability,phase separation,crystallinity,mechanical properties,and adhesive performance of the WPU dispersions.The FTIR results indicate that the degree of hydrogen bonding and the numbers of urea groups increase as the NCO/OH ratio and HDO/DMPA molar ratio increase.Furthermore,the phase separation increases and the thermal stability decreases as the NCO/OH ratio increases or the HDO/DMPA molar ratio decreases.Finally,WPU3.0-2.4 (NCO/OH=3,HDO/DMPA =2.4) exhibits a maximum tensile strength and shear strength,pointing to its possible use as an adhesive.These results could provide a very valuable reference for industrial applications of WPU.

1,5-pentamethylene diisocyanatepolyurethanewater based

Jiao Feng、Qiuhao Lu、Weiming Tan、Kequan Chen、Pingkai Ouyang

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State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China

National Engineering Research Center for Coatings, CNOOC Changzhou Paint and Coatings Industry Research Institute Co., Ltd., Changzhou 213016, China

This work was supported by the National Natural Science Foundation of ChinaThis work was supported by the National Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaJiangsu Province Natural Science Foundation

Grant Nos.2157613451503097Grant No.2016YFA0204300BK20150244

2019

化学科学与工程前沿
高等教育出版社

化学科学与工程前沿

CSTPCDCSCDSCIEI
影响因子：0.172
ISSN：2095-0179
年,卷(期)：2019.13(1)
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