Abstract

High-performance epoxy coatings were prepared by crosslinking commercial diglycidyl ether of bisphenol-A with silicon–sulfur containing di- and tetra-functional carboxyl curing agents based on cardanol. The curing agents were synthesized and products were analyzed by chemical, spectroscopic, and chromatographic techniques. In the next part, coatings were formulated by varying the ratio of epoxy resin to curing agents on equivalent basis, such as 1:0.6, 1:0.8, and 1:1. The coatings were applied on mild steel panels and cured at 150°C for 30 min. The resultant coatings were evaluated for performance properties including mechanical, chemical, optical, thermal anticorrosive, and flame retardant properties. It was observed that with an increase in concentration of silicon–sulfur containing curing agents, water contact angles of the coatings substantially increased. Moreover, electrochemical impedance spectroscopy, Tafel analysis, and salt spray studies revealed that anticorrosive properties of the coatings improved with an increase in concentration of silicon and sulfur. In spite of synergistic effect of silicon–sulfur, only marginal improvement in flame retardant properties was observed.

Graphic abstract

中文翻译：

---

可持续的基于腰果酚的多功能环氧固化剂，用于环氧涂料：Si–S协同作用

摘要

高性能环氧涂料的制备方法是，将双酚A的商用二缩水甘油醚与基于腰果酚的含二硫和四官能羧基固化剂的硅硫交联。合成了固化剂，并通过化学，光谱和色谱技术分析了产物。在下一部分中，通过按等效基准更改环氧树脂与固化剂的比例（例如1：0.6、1：0.8和1：1）来配制涂料。将该涂料涂在低碳钢板上，并在150°C下固化30分钟。评价所得涂层的性能，包括机械，化学，光学，热防腐和阻燃性能。据观察，随着含硅硫固化剂浓度的增加，涂层的水接触角大大增加。此外，电化学阻抗谱，Tafel分析和盐雾研究表明，随着硅和硫浓度的增加，涂层的防腐性能得到改善。尽管硅硫具有协同作用，但仅观察到阻燃性能的少量改善。

图形摘要