Synthesis of lignin-based polyols via thiol-ene chemistry for high-performance polyurethane anticorrosive coating

被引:85
作者
Cao, Yiding [1 ]
Liu, Zhenzhen [1 ,2 ]
Zheng, Bixia [1 ]
Ou, Rongxian [1 ,2 ]
Fan, Qi [1 ]
Li, Liping [1 ,2 ]
Guo, Chuigen [1 ,2 ]
Liu, Tao [1 ,2 ]
Wang, Qingwen [1 ,2 ]
机构
[1] South China Agr Univ, Coll Mat & Energy, Key Lab Biobased Mat & Energy, Minist Educ, Guangzhou 510642, Peoples R China
[2] Guangdong Lab Lingnan Modern Agr Sci & Technol, Guangzhou 510642, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
Lignin; Thermosetting polyurethane; Polyol; Thiol-ene chemistry; Anticorrosive coating; CORROSION PROTECTION; AQUEOUS-SOLUTION; ALKALI LIGNIN; RESISTANCE; IMPROVE; WATER; ACID; OIL;
D O I
10.1016/j.compositesb.2020.108295
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Sustainable thermosetting polyurethane (PU) anticorrosive coatings based on renewable biomass resources with long-lasting corrosion protection is highly desired. Herein, thermosetting lignin-based polyurethanes (LPU) coatings with superior corrosion resistance and high content of lignin were prepared by polymerization of lignin-based polyol (OH-EL) with hexamethylene diisocyanate (HDI) in absence of catalysts. In order to increase the reactivity and solubility of OH-EL when reacting with isocyanates, the phenolic hydroxyls of enzymatic hydrolysis lignin were selectively converted to primary aliphatic hydroxyls by sequential alkylation and thiol-ene reaction. Due to the well dispersion and crosslinking reactivity of OH-EL in the polyurethane networks, the resulting LPUs presented high thermal stability and excellent mechanical properties. Remarkably, LPU-3 with the content of OH-EL of 54.8 wt%, exhibited high T-g of 112 degrees C, high char residue percentage of 26.3% at 600 degrees C, high tensile strength up to 81.6 MPa and tensile modulus of 1.4 GPa. Moreover, the LPU-3 coating on carbon steel substrate exhibited low corrosion current density I-corr of 7.58 x 10(-11) A cm(-2), positive corrosion voltage E-corr of 118 mV, and high impedance modulus vertical bar Z vertical bar(0.01)Hz of 8.3 x 10(10) Omega cm(2) after immersing in 3.5 wt% NaCl solution for 0.5 h, and the vertical bar Z vertical bar(0.01Hz) remained at 3.9 x 10(10) Omega cm(2) after 40 days immersion, displaying superior corrosion resistance than other reported bio-based polymer coatings. These results demonstrate that the synthesis of highly reactive lignin-based polyols based on thiol-ene chemistry is an effective and facile strategy, which is vital for the development of high-performance bio-based polyurethane anticorrosive coatings.
引用
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页数:10
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