壳聚糖/二氧化硅复合仿生膜对 碳酸盐石材的保护作用

为探讨壳聚糖/二氧化硅复合仿生膜对碳酸盐石材的保护作用,采用仿生合成技术,以十六烷基三甲基溴化铵为有机模板,能过壳聚糖调控二氧化硅颗粒的生长,在碳酸盐石材表面仿生合成得到了一层壳聚糖/二氧化硅复合保护膜,对其基本性能进行了检测评价,并利用衰减全反射红外光谱和场发射环境扫描电子显微镜表征了膜的结构形貌。实验结果表明,该膜具有优良的耐酸、耐污性能,提高了膜层的抗冻融性和耐热老化性能,并保留了石材原有的吸水性和透气性。壳聚糖/二氧化硅复合膜改善了单一二氧化硅膜的开裂问题,且该保护膜与石材基体结合紧密、膜层薄,小影响石材外脱,是一种良好的碳酸盐石材保护材料。

Protection of carbonate stone by biomimetic chitosan/silica composite films

A chitosan/silica composite film was prepared on carbonate stone by biomimetic synthesis technology.During preparation, the surfactant cetytrimethylammonium bromide was used as a template on a natural stone slab,and chitosan was used to control the formation of silica particles on the stone surface.The protective performances of the film were evaluated,and its structure and microtopography were analyzed by ATRFTIR and FESEM.The results show that the chitosan/silica composite film has good acid resistivity and resistance to soiling.The freeze/thawing properties and resistance to heat deterioration were also improved by the film,while the hygroscopic property and the gas permeability of the stone were preserved.The CS/SiO₂ composite film overcomes the problem of the single layer SiO₂ film which cracks.The CS/SiO₂ film can attach tightly to the substrate.The film is very thin and has no effect on the appearance of the natural stone.All these indicate that it is a material with good prospects for carbonate stone conversation.