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为了提高用于脆弱硅酸盐质文物保护用丙烯酸酯类材料的耐老化性及渗透性,将正硅酸乙酯酸性水解制得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、傅里叶变换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、分解温度、分子结构等变化,利用扫描电子显微镜观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。结果表明,在质量分数10%的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。
In order to improve the aging resistance and permeability of acrylic materials used for the protection of fragile silicate cultural relics, silica sol prepared by acidic hydrolysis of ortho-silicic acid ethyl ester was added to an acrylate material to modify the nano-structure to prepare Nano-SiO2-Acrylate Organic / Inorganic Composites. The changes of color, viscosity, glass transition temperature, decomposition temperature and molecular structure of protective materials before and after modification were studied by using spectrophotometer, advanced rotational rheometer, differential scanning calorimeter and Fourier transform infrared spectrometer. Scanning Electron microscopy was used to observe the dispersion of inorganic and organic phases, and the aging resistance of the selected materials was tested. At the same time, the composites were further used to reinforce the simulation samples of ceramic tires. The changes of air permeability and compressive strength of the samples were studied. The results showed that when the mass fraction of silica sol is 10%, the modified material A7 is transparent and the thermal stability, aging resistance and permeability of the original material are improved, and the content of Good reinforcement and protection.