Study Of Anti-corrosion And Anti Pollution Stone Protective Material

Material is the foundation of architecture.As the most important building material,stone is widely used.However,stone resources are non renewable resources.Because of its loose and porous structure,stone resources are vulnerable to many factors such as natural factors and human factors,which not only damage its beauty,but also easily lose its use performance.From the perspective of circular economy,no matter whether the resource reserve is rich or not,whether the resource utilization is efficient or not,the final result will be resource exhaustion.China is a big stone country,how to protect the existing stone resources is the most important problem in the field of stone.The damage of stone resources mostly comes from the damage of water,cracking,weathering,corrosion and pollution are inseparable from the intervention of water,the fundamental of stone protection is to eliminate the invasion of water,and hydrophobicity is the fundamental performance of stone protection materials.The performance of the existing stone protection materials is generally single,most of which are studied for a single performance,and few of them are considered to have multiple performance in one;moreover,from the perspective of hydrophobicity,the existing stone protection materials only have certain hydrophobicity,and the water delivery angle is not more than 130°,which does not reach the super hydrophobic effect.In this project,the stone protective material obtained by sol-gel method can make the surface of the stone form a nanostructured bump.When the droplet contacts,it can produce tiny air bags on the contact surface and reduce the effective contact area between the water droplet and the stone.After hydrophobic modification of nano particles,the surface tension is reduced,the contact angle is more than 130°and the rolling angle is less than 10°.The super hydrophobic effect of lotus leaf effect can be formed,which makes it difficult for water drops and stains to adhere,so as to achieve the effect of hydrophobic,anticorrosive and stain resistant.Firstly,the modified nano silica stone protective material was prepared.The material ratio,reaction conditions and modification methods were determined by comparative experiments.When the ratio of water,ethanol,hydrochloric acid and TEOS is 1:1,4:3,1:13,respectively,and the reaction temperature is 60?and the reaction time is 3.5H,the hydrophobic effect of the stone protective material is good,and the surface contact angle is up to 119°;the performance of the stone protective material added with n-octylamine surfactant is better than that of the other two surfactants,and the ratio is 0.2%Excellent,the surface contact angle can reach 121°;the modifier silicone oil is hydroxyl silicone oil,because the unique hydroxyl of hydroxyl silicone oil can dehydrate and condense with the protective material,inlay the methyl group with hydrophobic performance in the protective material system,improve its performance,the surface contact angle can reach up to 122°;adding the surfactant n-octylamine?or hydroxyl silicone oil?,not only can improve the stone conservation The hydrophobicity of the protective material makes it also have certain corrosion resistance and acid resistance.Secondly,the modified nano titanium dioxide stone protective material was prepared.When the content of n-octylamine is 0.3%,the surface contact angle can reach 121°;the optimal content of hydroxy silicone oil is 0.2%,and the surface contact angle can reach 119°;under this condition,the modified nano silicon dioxide stone protective material can achieve 5grades of pollution resistance and has good corrosion resistance.Finally,the protective material of modified nano titanium silicon stone was prepared.When the mass ratio of Nano-Si O₂sol and nano-Ti O₂sol is 3:1,the surface contact angle can reach 133°,rolling angle is 8°,and the pollution resistance grade is 6.Because the bond energy of si-o-ti bond is relatively high,it has better oxidation resistance and corrosion resistance.