A new deep eutectic solvent-based green gel for the removal of polymeric coating from mural painting

IF 3.5 2区综合性期刊 0 ARCHAEOLOGY

Journal of Cultural Heritage Pub Date : 2024-11-21 DOI:10.1016/j.culher.2024.11.006

Yiming Jia , Liangshuai Zhang , Kexin Tan , Shaohua Dong , Youzhou He , Lin Ye , Wenhua Zhao , Laiyuan Gu , Silvia Prati , Jiujiang Bai

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Abstract

It is challenging to extend the species of deep eutectic solvent (DES) based gels, particularly in forming non-toxic polymer gels with good mechanical properties. In this study, we propose an eutectogel system for cleaning purposes in the field of culture heritage conservation. Green gels containing ChCl-EG-GVL-PVA and ChCl-EG-PVA are produced by combining choline chloride (ChCl), ethylene glycol (EG) and polyvinyl alcohol (PVA) with or without γ-valerolactone (GVL). The crosslinking of the gels is primarily formed by ChCl-EG and PVA through hydrogen bonding. The additional green solvent GVL is compatible with the gel composition and plays an important role in cleaning. The developed gels exhibit good mechanical properties and fine microstructures, making them easy to handle and suitable for cleaning cultural relics. Therefore, the gels have been tested on a mockup coated with Paraloid B72^Ⓡ to examine their cleaning efficiency. Furthermore, the selected gel has been validated on a Yuan dynasty mural painting for the removal of aged acrylic coating. The results from both the mockup and the real case study demonstrate the effective cleaning efficiency of the ChCl-EG-GVL₂-PVA₂ gel and highlight its potential usefulness in the field of cultural heritage conservation.

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用于去除壁画聚合物涂层的新型深共晶溶剂型绿色凝胶

扩大基于深共晶溶剂（DES）凝胶的种类，尤其是形成具有良好机械性能的无毒聚合物凝胶，是一项挑战。在这项研究中，我们提出了一种用于文化遗产保护领域清洁目的的共晶凝胶系统。通过将氯化胆碱（ChCl）、乙二醇（EG）和聚乙烯醇（PVA）与γ-戊内酯（GVL）或不与γ-戊内酯（GVL）结合，制备出含有 ChCl-EG-GVL-PVA 和 ChCl-EG-PVA 的绿色凝胶。凝胶的交联主要由 ChCl-EG 和 PVA 通过氢键形成。附加的绿色溶剂 GVL 与凝胶成分兼容，并在清洁方面发挥了重要作用。所开发的凝胶具有良好的机械性能和精细的微观结构，因此易于处理，适合用于清洗文物。因此，在涂有 Paraloid B72Ⓡ 的模型上对凝胶进行了测试，以检验其清洁效率。此外，还在一幅元代壁画上对所选凝胶进行了验证，以去除老化的丙烯酸涂层。模拟和实际案例研究的结果都证明了 ChCl-EG-GVL2-PVA2 凝胶的有效清洁效率，并突出了其在文化遗产保护领域的潜在用途。

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来源期刊

Journal of Cultural Heritage 综合性期刊-材料科学：综合

CiteScore

6.80

自引率

9.70%

发文量

166

审稿时长

52 days

期刊介绍： The Journal of Cultural Heritage publishes original papers which comprise previously unpublished data and present innovative methods concerning all aspects of science and technology of cultural heritage as well as interpretation and theoretical issues related to preservation.