在基于素的环氧抗腐蚀涂料中,分子量取决于水的吸收和动态
Azade Kafashan1, Timon Binger1,2, Markus Schackmann2
1CoaST, Department of Chemical and Biochemical Engineering, Technical University of Denmark (DTU), Building 229, 2800 Kgs. Lyngby, Denmark. naraj@kt.dtu.dk.
Faraday discussions
|October 4, 2025
概括
强力素 (KL) 的溶剂分化显著提高了其作为环氧涂层颜料的性能. 低分子量KL通过减少水吸收和改善环氧矩阵兼容性来增强屏障特性.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 腐蚀科学 腐蚀科学
背景情况:
- 实力素 (KL) 是一个潜在的生物基色素用于环氧涂层.
- 由于KL的分子量和聚合,在纳入KL方面存在挑战.
- 溶剂分化提供了一种修改KL属性的方法.
研究的目的:
- 研究素分子量对环氧涂料屏障性能的影响.
- 为了比较溶剂分成的低分子量KL与机械选的高分子量KL和氧化铁颜料.
- 了解红素分子量如何影响水的吸收和运输机制.
主要方法:
- 用机械选KL (KL-sieved-EP),溶剂分离KL (KL-EtOAc-EP) 和氧化铁 (FeOOH-EP) 染色的环氧涂料的制备.
- 使用重力测量质量增益分析评估吸水量.
- 使用电化学阻抗光谱 (EIS) 评估水运和屏障性能.
- 使用扫描电子显微镜 (SEM) 进行微结构分析.
主要成果:
- KL-EtOAc-EP表现出最低的吸水和扩散系数,这表明屏障性能优越.
- KL-sieved-EP显示了最高的平衡水吸收.
- KL-EtOAc-EP在环氧基质中显示出增强的兼容性和分散性,没有观察到明确的色素-粘合剂接口.
- 铁氧化物颜料涂层 (FeOOH-EP) 显示出更快的水运输,尽管与KL-EtOAc-EP的总吸水量相比.
结论:
- 对KL的溶剂分化产生了低分子量颜料,显著提高了环氧涂料的屏障性能.
- 降低KL的分子量和聚合提高了其与环氧基质的兼容性,从而产生更凝聚性和无缺陷的涂层.
- 基于素的环氧涂料,特别是具有溶剂分离的KL涂料,为传统抗腐蚀色素提供了有前途的替代品.
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