脆弱硅酸盐质文物保护用纳米级SiO2—丙烯酸酯复合材料的性能研究

Study On Performance of Nano SiO2—Polyacrylate Composite Materials for Protecting Damaged Silicate Cultural Relics

摘要:

为了提高用于脆弱硅酸盐质文物保护用丙烯酸类材料的耐老化性及渗透性，将正硅酸乙酯酸性水解制得到的硅溶胶添加于丙烯酸酯材料中进行纳米改性，制备出纳米级SiO2—丙烯酸酯有机/无机复合材料。采用分光光度计、高级旋转流变仪、差式扫描量热仪、傅立叶红外光谱仪研究改性前后保护材料的颜色、黏度、玻璃化转变温度、分子结构等变化，利用扫描电子显微镜考察无机相和有机相的分散状况，并对所筛选材料的耐老化性能进行测试分析。同时进一步将复合材料用于陶胎模拟样品的加固保护中，研究了复合材料用于模拟样品的透气性、抗压强度的变化。实验结果表明：在10%丙烯酸酯材料中加入硅溶胶体积分数为7.0%时，改性材料A7成膜透明，提高了原有材料的热稳定性、耐老化性、渗透性，并具有良好的加固保护作用。

Abstract:

In order to enhance the aging resistance and permeability of acrylate used as protection of damaged seriously silicate cultural relics, nano SiO2 obtained by acid-catalyzed hydrolysis reactions of tetraethoxysilanewas added to polyacrylate via blending method. The physical appearance，viscosity，glass transition temperature，molecular structure and physical properties of composites were evaluated by spectrophotometer，advanced rotational rheometer，DSC, ATR-FTIR and SEM. The selected modified material was used for protection of pottery samples，the permeability and compressive strength of the treated samples were tested. The results indicated the modified material A7 added 7.0 percent of silica sol gave transparent membranes, obtained better thermal resistance, aging resistance and penetration. What’s more，A7 had excellent performance in the protection of the damaged seriously silicate cultural relics.