摘要
红军标语是不可再生的文化遗产,目前正面临着损坏乃至消失的危险。对地仗层进行适当的封护处理,可以增强其耐久性能,达到保护的目的。使用纳米Ca(OH)2对聚己内酯(PCL)进行改性,制备了一种可生物降解的红军标语地仗层封护剂;通过X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)和差示扫描量热法(DSC)等手段对封护剂进行了表征;通过耐紫外光老化、耐冻融循环、耐可溶盐侵蚀、耐水侵蚀和耐酸雨侵蚀试验评估了封护试样的抗压强度、抗折强度和色差值。结果表明,封护剂中PCL成膜后可有效阻止水分从试样外部进入内部;微团聚的Ca(OH)2与纳米Ca(OH)2共同形成了微米/纳米复合结构,使封护膜的疏水性得到有效增强;纳米Ca(OH)2的加入可提高封护膜的透气性;封护剂可提高封护试样的耐久性。以上结果表明纳米Ca(OH)2改性的PCL封护剂对模拟红军标语地仗层具有良好的封护效果。
Red Army slogans are a non-renewable cultural heritage,which are facing the risk of damage or even disappearance.The durability of the base layer can be enhanced by an appropriate sealing agent.In this work,polycaprolactone(PCL)has been modified with nano calcium hydroxide to prepare a biodegradable sealant for Red Army slogans.The sealant was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier transform infrared spectrometry(FT-IR),and differential scanning calorimetry(DSC).The compressive strength,flexural strength and color difference of the sealed samples were evaluated by ultraviolet ray aging resistance,freeze-thaw cycle resistance,soluble salt erosion resistance,water erosion resistance and acid rain erosion resistance tests.The results showed that the presence of PCL in the sealant can effectively prevent external water from entering the sample after forming the film.Microagglomerated Ca(OH)2 and nano Ca(OH)2 formed a micron-nanocomposite structure,which effectively enhanced the hydrophobicity of the film.The addition of nano Ca(OH)2 can improve the permeability of the membrane.The sealing agent can improve the durability of the sealing samples.The results showed that the sealant had good sealing effect on a simulated Red Army slogan base layer.
作者
张涛
王莉
吴玉清
王菊琳
刘波涛
ZHANG Tao;WANG Li;WU YuQing;WANG JuLin;LIU BoTao(Beijing Institute of Ancient Architecture,Beijing 100050;Key Laboratory of Electrochemical Processes and Technologies of Materials,Beijing University of Chemical Technology,Beijing 100029;College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029;Key Research Base of National Cultural Heritage Administration for Science and Technology Evaluation and Research in the Field of Cultural Heritage Protection,Beijing 100029,China)
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第2期41-50,共10页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
