Study On Biomimetic Synthesis And Properties Of Rock-Soil Relics Oxalate Protective Materials

The research and protection of geotechnical cultural relics is conducive to building a culturally powerful country and conforms to China’s development trend.However,the identification of geotechnical cultural relics is not rigorous,and the existing protective materials cannot fully meet the protection requirements.Therefore,it is of great significance to use modern material analysis methods to identify cultural relics and develop targeted protective functional materials on this basis.The work content and conclusion of this article mainly include the following aspects:（1）Use XRD,energy spectrum analyzer,SEM,BET,thermal expansion analyzer and other modern material analysis methods to identify the composition,morphology,porosity,element composition and sintering temperature of the cultural relics unearthed in Yunnan area,and discover the cultural relics Belongs to geotechnical artifacts.The main component of the cultural relic is SiO₂,which is composed of Si,O,Al and K elements.There is a void structure on the surface,the pore size is distributed between 3nm and 4 nm,the sintering temperature is 100±0.2℃,and the molding temperature is100-110℃between.（2）Taking the marble as the protection object,using the bionic synthesis technology,the geotechnical cultural relic protection material-barium oxalate was prepared.Through the"three factors and three levels"orthogonal experiment,optimize the specific parameters of the cleaning agent,organic template and coating times.Influencing factors:influence of cleaning agent>influence of organic template>influence of coating times.The optimal conditions are:ethanol as a cleaning agent,1.0%（m/m）chondroitin sulfate solution as an organic template,coated 10 times.Through XRD and SEM characterization methods,the composition and microscopic morphology of the material were analyzed.The crystals were needle-rod structures with a length of30-50μm,closely intertwined on the organic template layer,and the film thickness was about 5μm.（3）Through the performance characterization test of the protective film of barium oxalate,it was found that the mass loss rate of the stone treated with barium oxalate in acidic and alkaline environments for 8h was only 1.04%and 0.034%,respectively,and the quality loss in salt corrosion environment The rate is 0.67%,which is lower than the mass loss rate of the treated stone,indicating that the protective film has good corrosion resistance;at the same time,in the determination of acid resistance,water repellency and stain resistance,it is found that the protective film of barium oxalate can resist The sulfuric acid solution with H+concentration of 2mol/L,contact angle of 74.20°,and stain resistance rating is between 1-2,The color difference was 1±0.1,indicating that the barium oxalate protective film also has good water repellency,acid resistance,and stain resistance.（4）Using biomimetic synthesis technology,a calcium oxalate protective film was prepared.Through SEM inspection,it was found that the calcium oxalate protective film was formed by the polymerization of lamellar crystal particles,and the crystal layer was about 1μm×1μm.By comparing the performance of oxalate protective materials,it was found that in the characterization of acid corrosion resistance,alkali corrosion resistance and salt corrosion resistance,the mass loss rate of CaC2O4Δm（%）is greater than the mass loss rate of BaC₂O₄.Barium oxalate protective film is superior to calcium oxalate protective film in terms of corrosion resistance.In the hydrophobicity test,the contact angle of the CaC2O4 film is greater than that of the BaC₂O₄ film,so the protective film of calcium oxalate film is better than the protective film of barium oxalate in terms of hydrophobic performance.