A sandstone-like stone cultural relic protection material and its preparation and application method

Abstract

A disclosed sandstone stone cultural relic protection material is a sol with uniform transparent appearance, and is prepared by performing mixing and reacting on 100 parts by weight of tetraethyl orthosilicate, 0.5-10 parts by weight of poly(dimethylsiloxane), 0.05-5 parts by weight of nano-hydroxyapatite, 0.1-3 parts by weight of an organic metallic tin catalyst and 0.002-0.5 part by weight of a silicane coupling agent. When the material is used, the material can be diluted with an organic solvent for 0-10 times, the stone cultural relic subjected to surface cleaning processing is brushed, sprayed or immersed with the diluent until no protection material is absorbed, and then the stone cultural relic is placed in natural environment and aged for one month or more. By employing the protection material to process the substrate surface of sandstone stone cultural relics, the to-be-protected stone cultural relic can be substantially improved in hydrophobic performance and compressive strength; and the protection material provided by the invention is capable of resisting exterior environment influence caused by acid rain, salt, humiture variation and the like, also is simple and practical in operation technology, mild in reaction conditions and low in cost, and is suitable for industrial scale production and application.

Description

technical field [0001] The invention belongs to the technical field of cultural relic protection materials and their preparation and application, and in particular relates to a sandstone-like stony cultural relic protection material used in a humid environment and a preparation and application method. Background technique [0002] There are many cultural relics in our country, among which stone cultural relics account for more than half of the entire cultural heritage, such as stone carvings, cave temples, steles, etc., many of which have been included in the "World Heritage List". However, most of these stone cultural relics are exposed to the natural environment, and are affected by man-made and natural environments, resulting in severe weathering, and some even endanger the long-term preservation of cultural relics, such as weathering and erosion of grottoes, broken and collapsed stone carvings, etc. For stone cultural relics, "the root of all evil is water". For example,...

AI Technical Summary

Problems solved by technology

However, this kind of material is easy to crack during the gelation process inside the stone, and it is not resistant to acid and salt in a humid environment, so it also faces some problems that need to be solved in practical applications.

For this reason, U.S. Patent US8097307B2 discloses a kind of use n-octylamine as a surfactant to reduce capillary pressure and reduce the cracking of protective materials in use, but in this material system, hydrochloric acid, which is not conducive to the protected stone cultural relics object, is used As a catalyst, and the protection objects involved are mainly calcareous stone cultural relics, the scope of use is relatively narrow; some scholars solve the problem by introducing polydimethylsiloxane (PDMS) organic flexible chain segments to react with ethyl silicate Cracking of materials (Zárraga, R., Cervantes, J., Hernandez, C.S., Wheeler, G. Effect of the addition of hydroxyl-terminated polydimethylsiloxane to TEOS-based stone consolidants. J. Cult. Herit. 11 (2010) 138 -144), but there is no related research and data disclosure on the impact of these protective materials on the strength of cultural relics and long-term aging resistance after being applied to stone; some scholars have further introduced silica nano-inorganic particles or Sol prepared composite materials to solve the problem of cracking and hydrophobicity of protective materials during implementation (D.Li, F.G.Xu, Z.H.liu, J.Q.Zhu, Q.J.Zhang, L.Shao, The effect of adding PDMS-OH and silica nanoparticles on sol-gel properties and effectiveness in stone protection, Appl.Surf.Sci.266(2013) 368-374; D.S.Facio, M.J.Mosquera, A simple strategy for producing superhydrophobic nanocomposite coatings on building materials, ACS Appl.Mater.Interfaces, 5 (2013), 7517-7526), ​​but unfortunately not only the preparation methods of these protective materials are complicated, but also the strength of the protective materials applied to stone cultural relics and the aging properties of long-term acid resistance, salt resistance, temperature and humidity changes, etc. involve

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