甲基三甲氧基硅烷对砂岩石刻封护性能的实验室研究

为了解砂岩石刻用甲基三甲氧基硅烷材料封护处理后的各项性能，选择四川省内风化较严重的摩崖造像区的砂岩作为实验样品，采用浸水、酸雾、盐老化、光老化、循环破坏等方法对材料的憎水性、透气性、耐老化性能进行实验测试。试验表明，砂岩样品用甲基三甲氧基硅烷封护处理后其憎水性、耐老化性都有较大的提高，透气性没有太大的改变，半涂样品经循环破坏处理后，表面出现开裂现象。通过研究表明，甲基三甲氧基硅烷材料处理砂岩后其憎水性和耐老化性都较好，但循环破坏实验提示，甲基三甲氧基硅烷材料处理石刻可能对其表面产生负作用，在石刻保护中应慎重使用。

Study of the protective properties of methyl-trimethoxysilicane on historic sandstone

In order to understand the protective properties of the sandstone surface after being treated with methyl- trimethoxysilicane,some badly wind-decayed sandstone samples from grotto in Sichuang Province were selected for experiments.A series of experiments was conducted to test the water-resistance,ventilation and anti-aging prop- erties.Experiments included water-soaking,exposure to acid fog and ultraviolet ray and decaying cycles damage texts.The research showed that the sandstones treated with methyl-trimethoxysilicane have much better water-re- sistance and anti-aging properties but no obvious changes on ventilation.Cracks were observed on the surface of one stone treated with methyltrimethoxysilicane.Our experiments suggested that the water-resistance and anti-ag- ing properties of stones treated with methyltrimethoxysilicane have been improved,but the decaying cycle damage test showed the treatment might bring negative effect to the treated stone.We concluded that methyltrimethoxysili- cane should be used with care.