Method for preparing a coating for protecting a stone surface against acid rain

Abstract

The invention discloses a method for preparing a coating for protecting a stone surface against acid rain, belonging to the field of inorganic chemical engineering. The method comprises the following steps: (A) deionized water and organic solvent are sequentially used for ultrasonically cleaning the stone surface which is then dried in the air; (B) CTAB with a percentage concentration of 2 percent to 5 percent by weight is used as pre-treatment fluid for treating the stone surface which is then dried in the air; (C) Na2SiF6 solution is fetched and put in a container, H3BO3 is added per liter of the container, and the solution is added; then, the stone subject to the treatment in the above steps is immersed into the solution and then hermetically by a polyethylene film to stand; and the stone is taken out, cleaned with water and dried in the air, and then a film layer is formed on the stone surface. The invention does not change the appearance, the color and the touch feeling of the substrate of an original rock. A result from the film layer shows that the hydrophobicity, stain resistance and acid prevention of the protected and process stone are improved to some extent. The method is carried out in the physiological condition of normal temperature and normal pressure, is environmental-friendly and better meets the requirements in protecting the external wall surface of a stone-made building.

Description

technical field [0001] The invention relates to a method for preparing an anti-acid rain coating for stone materials, in particular to a preparation method for bionically synthesizing an inorganic surface protection material whose main component is silicon dioxide on the surface of stone materials. Background technique [0002] For a long time, the materials that have been used to protect the surface of stone building exterior walls mainly include epoxy resin, acrylic resin, organic silicon or fluorine polymers, etc. The famous Longmen Grottoes, Yungang Grottoes, and Dazu Grottoes in China all use epoxy resin resin for reinforcement. The main problems are: (1) The actual effective life of organic polymer protective materials in the field cannot meet the requirements for the surface protection of stone building exterior walls. Function; (2) The contradiction between the hydrophilicity of the stone itself and the hydrophobicity of the organic protective film, the hydrophobici...

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Problems solved by technology

[0004] Aiming at the long-term weathering and oxidation of the existing stone material surface, the stone is easily corroded. The invention provides a preparation method of an acid rain-resistant coating on the stone surface, which is suitable for different climates and is resistant to acid rain erosion. Preparation method of anti-acid rain environmental protection coating for stone buildings

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