Preparation and performance evaluation of magnolol-based epoxy resin anti-corrosion coatings

doi:10.11949/0438-1157.20230492

Abstract

Abstract:

Using epichlorohydrin and bio-based compound magnolol as raw materials, magnolol epoxy resin (DGEM) was prepared by one-step reaction, and polyetheramine D230 was used as curing agent to prepare anti-corrosion coating containing mica powder. Comprehensive analyses and characterizations were performed by using multiple techniques, including infrared spectroscopy, wear resistance testing, thermogravimetric analysis, differential scanning calorimetry, electrochemical workstation, pencil hardness testing, and impact testing. The effects of varying mica powder filler content on the corrosion resistance of the coating were investigated. The results revealed that the addition of 3% (mass) mica powder filler significantly enhanced the mechanical and corrosion resistance properties of the DGEM-D230 coating. Specifically, the DGEM-D230-3% exhibited a pencil hardness of 4H, an impact strength of 30 cm, an electrochemical impedance value of 8.47×10⁸ Ω∙cm², a residual carbon yield of 37.1% at 800°C under a nitrogen atmosphere, and a flexibility of 0.5 mm, with 0-level adhesion, surpassing those of the pure DGEM-D230 coating. These findings highlight the potential of DGEM-D230-3% coating as a promising corrosion-resistant coating for various applications.

Key words: bio-based, epoxy resin, magnolol, anti-corrosion coating

摘要：

以环氧氯丙烷和生物基化合物厚朴酚为原料，通过一步反应制得厚朴酚环氧树脂（DGEM），以聚醚胺D230为固化剂制备含云母粉的防腐涂层。采用红外光谱仪、耐磨试验仪、热失重分析仪、差示扫描量热仪、电化学工作站、铅笔硬度、冲击试验器等对涂层进行分析表征和性能测试，研究了云母粉填料用量对涂层的耐腐蚀等相关性能的影响。结果表明：相比于纯DGEM-D230涂层，添加3%（质量）云母粉填料的涂层DGEM-D230-3%表现出更好的力学性能和耐腐蚀性能，其铅笔硬度为4H，冲击强度为30 cm，低频阻抗模值达到8.47×10⁸ Ω∙cm²，氮气氛围下800℃时的残炭率为37.1%，柔韧性达到0.5 mm，附着力达到0级。

关键词: 生物基, 环氧树脂, 厚朴酚, 防腐涂层

CLC Number:

TQ 050.9

Jing ZHAO, Chengwen GU, Xigao JIAN, Zhihuan WENG. Preparation and performance evaluation of magnolol-based epoxy resin anti-corrosion coatings[J]. CIESC Journal, 2023, 74(7): 3010-3017.

赵婧, 顾程文, 蹇锡高, 翁志焕. 厚朴酚基环氧树脂防腐涂层的制备及性能评价[J]. 化工学报, 2023, 74(7): 3010-3017.

Figures/Tables 7

Fig.1 Synthetic route of DGEM and its cured product with D230 as curing agent

Fig.2 FTIR spectra of DGEM-D230

Fig.3 Nyquist plots of different composite DGEM-D230 coatings immersed in 3.5% (mass) NaCl solution for 1, 7, 15, 30 d

Fig.4 Bode plots of different composite DGEM-D230 coatings immersed in 3.5% (mass) NaCl solution for 1, 7, 15, 30 d

Fig.5 Equivalent circuit models for coatings during early, mid, late immersion stages

Fig.6 Comparison of mechanical properties of coatings

Fig.7 TGA and DSC curves of DGEM-D230 and DGEM-D230-3% mica powder under N2 atmosphere

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