摘要
为研究制作保护石质文物的加固材料,采用溶胶-凝胶法,以两种有机硅材料(正硅酸乙酯(TEOS)和甲基三乙氧基硅烷(MTES))为共同前驱体,少量正辛胺为催化剂,聚二甲基硅氧烷(PDMS)(方法 1)或硅烷偶联剂KH-570(方法 2)为有机改性剂,制备了有机-无机复合疏水型Si O2涂层。通过红外光谱(FT-IR)、扫描电镜(SEM)和水接触角(WCA)来表征在砖块表面形成的SiO_2膜层化学组成、表面形貌以及疏水性能,然后再通过测试砖块加固前后外观、吸水性能和孔隙率的变化来验证实际加固效果。结果表明,两种方法均可以制备骨架带-CH3基团的SiO_2溶胶。采用方法 1(添加前驱体质量10%的PDMS)或者方法 2(MTES/TEOS质量比为2),加固后的砖块对水接触角均超过140°,毛细吸水率降低到未处理时的1%~2%,并且砖块的色差和光泽度改变较小。通过耐候性能测试表明,方法 2的保护效果相对较好,说明用此种方法合成的疏水性二氧化硅涂层可以作为砖块加固材料。
Composite organic-inorganic hydrophobic silica films were made by the sol-gel method using tetraethyl orthosilicate(TEOS)and methyl triethoxysilane(MTES)as the precursors,a little n-octylamine as the catalyst,and polydimethylsiloxane(PDMS)(method 1)or silane coupling agent KH570(method 2)as the organic modifier.Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM)and water contact angle(WCA)were used to analyze the chemical components,surface morphological structure and hydrophobicity of silica films on brick surfaces.The reinforcement effects on the bricks were verified by testing their variations in appearance,water absorption and porosity before and after being reinforced.The result shows that silica sol with-CH 3 group could be obtained using both of the two methods.In addition,the water contact angles treated by both methods(method 1:mass ratio of PDMS to the precursors is 10%;method 2:mass ratio of MTES to TEOS is 2)exceeded 140.The capillary water absorptivity was reduced to 1~2%the rate for the untreated bricks,while the color difference and gloss was little changed for the reinforced bricks.However,the conservation effect of method 2 is better than method 1 in terms of weathering resistance according to a relevant test,indicating that the hydrophobic silica films synthesized by method 1 should be selected as the reinforcement material for bricks.
作者
杨隽永
徐飞
YANG Juan-yong;XU Fei(Science and Technology Institute for Conservation of Historical Relics of Nanjing Museum,Nanjing 210016,China)
出处
《文物保护与考古科学》
北大核心
2018年第2期10-19,共10页
Sciences of Conservation and Archaeology
基金
江苏省文物科研课题资助(2015sk07)
关键词
有机-无机
溶胶-凝胶法
疏水性涂层
耐候性能测试
石质文物保护
Organic-inorganic
Sol-gel method
Hydrophobic film
Test of weathering resistance
Stone relic conservation
