Investigation of the anticorrosion performance of lignin coatings after crosslinking with triethyl phosphate and their adhesion to a polyurethane topcoat.

Q2 Agricultural and Biological Sciences

Agronomy research Pub Date : 2020-01-01 DOI:10.15159/AR.20.061

A. Dastpak, B. Wilson, M. Lundström

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引用次数: 3

Abstract

. This study investigates the anticorrosion properties of sustainable organic coatings, which were prepared by dissolution of two different types of technical lignins - organosolv lignin (OL) and kraft lignin (KL) - in an organic solvent and applied onto iron-phosphated steel by air-assisted spray coating. Influence of triethyl phosphate (TEP) as a crosslinking agent for lignin and its effect on the anticorrosion properties of coatings during 24 h of immersion in 3.5% NaCl were investigated. Results obtained from electrochemical impedance spectroscopy (EIS) of coated steels suggest that the initial protection performance (1 h immersion) of non-crosslinked OL is higher than that of KL. Nevertheless, KL coatings that contained TEP and were heat-treated at elevated temperature (180 °C) demonstrated the best overall anticorrosion performance. In contrast, a similar trend was not observed for OL coatings, which indicates that the structural properties of lignin may be a crucial factor in applicability of TEP as a crosslinking agent. In addition, a layer of polyurethane was applied on all the different types of lignin coatings prepared and their adhesion characteristics were studied by crosscut adhesion measurements (ISO 2409). These adhesion results revealed that neither KL-TEP nor OL-TEP coatings demonstrate proper adhesive characteristics with a polyurethane (PU) topcoat and consequently these coatings are not suitable for utilization as a primer coating for the PU topcoat studied

查看原文本刊更多论文

与磷酸三乙酯交联后木质素涂料的防腐性能及其与聚氨酯面漆的附着力研究。

．将两种不同类型的工艺木质素——有机溶剂木质素(OL)和硫酸盐木质素(KL)在有机溶剂中溶解，并采用气助喷涂的方法涂覆在磷酸铁钢表面，研究了可持续有机涂料的防腐性能。研究了磷酸三乙酯(TEP)作为木质素交联剂在3.5% NaCl溶液中浸泡24 h对涂料防腐性能的影响。电化学阻抗谱(EIS)结果表明，非交联OL的初始保护性能(浸泡1 h)高于KL，但经高温(180℃)热处理的含TEP的KL涂层整体防腐性能最好。相比之下，在OL涂层中没有观察到类似的趋势，这表明木质素的结构特性可能是TEP作为交联剂适用性的关键因素。此外，在制备的不同类型木质素涂层上涂上一层聚氨酯，并通过横切附着力测量(ISO 2409)研究其附着力特性。结果表明，KL-TEP和OL-TEP涂料与聚氨酯(PU)面漆的粘附性能均不理想，因此不适合作为所研究的PU面漆的底漆

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来源期刊

Agronomy research Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

7 weeks

期刊介绍： Agronomy Research is a peer-reviewed international Journal intended for publication of broad-spectrum original articles, reviews and short communications on actual problems of modern biosystems engineering including crop and animal science, genetics, economics, farm- and production engineering, environmental aspects, agro-ecology, renewable energy and bioenergy etc. in the temperate regions of the world.