Water-based stone protectant
Water-based (water-based) protective agents are generally classified into transparent protective agents, emulsion-type protective agents, and paste-like protective agents. The penetration ability of the water-based protective agent is relatively poor compared with the solvent-based protective agent. The alkali resistance and wear resistance are also weak, and the aging resistance time is also short. The usual protection period is 3 months to 1 year. The water-based stone protectant has a pH value of 10-14, which is corrosive to strong alkali. When the cement is easily decomposed and loses its protective effect, it will also cause yellowing of the stone due to too strong alkalinity, and will damage the stone. Internal structure. Moreover, no matter which kind of water-based stone protective agent, after the solvent is volatilized, some excess protective agent will remain on the surface of the stone and form a hard crystal film, which will greatly affect the bonding effect of stone and cement.
Methyl acrylate protective agent
The stone protectant (acrylic protective agent) with methacrylic resin as the main component is a polyelectrolyte material, its properties are greatly affected by the pH value, and it is very sensitive to the strong alkali liquor of cement. The methyl methacrylate protectant has a solid solution, a solution, a latex, etc., and its gas-sealed pores have good performance, and are often used for the protection of rough stone, and can form sanding, mercerizing and bright light on the surface of the stone. Equal plastic film. And can also be used in many other places. However, whether it is an aqueous or oily type of methyl acrylate protective agent, it does not enhance the adhesion of cement and stone, and even has a certain weakening, and its resistance to cement erosion is not very good.
Organic oxime type protective agent
The protective agent with organic hydrazine as the main solid component, such as decane protective agent and denaturing oxidant protective agent, is characterized by strong bond structure of organic bismuth and injection of pore texture infiltration, so that it can be breathable. purpose. The utility model has the advantages of good waterproof effect, suitable for surface treatment of mirror stone, and is a mainstream protective agent for the stone conservation industry, and belongs to a front type stone protective agent. However, if this kind is applied to the back and sides of the stone, the stone can not be wetted by water, which will greatly affect the bonding of the stone and the cement, and it is easy to cause the stone to loosen immediately and empty, resulting in a total stickiness. Dilemma.
Organic decane fluoride protective agent
Fluorinated fluorinated fluorinated fluorene oxide, which has the advantages of waterproofing of the casing and enhanced oil and stain resistance. It is the most famous surface protection product. However, the organic decane fluoride protective agent itself does not have any adhesive properties and cannot be wetted by water. It can only be used for the protection of the front side of the stone. If it is used on the back side, the test result is very good, completely affecting the stone and Bonding properties of cement.
Water-based emulsion type protective agent
Water-based emulsion type stone protectant, generally used as an aqueous raw material of anthrone and fluoranthene, and also an emulsion of a chemical linkage of a siloxane and a fluorodecane, and an emulsion of a chemical bond of a siloxane and a acrylate; The structure is dense, not easily wetted by water molecules, and can form a tough protective film after drying. If the water-based emulsion type protective agent is used as the bottom surface protection, the influence of adhesion is small, but there is still a certain gap between waterproofing, anti-aging, anti-yellowing, water resistance and reinforcing stone strength. As for the anti-pathology and anti- The ability to oscillate and stick is not enough, so it is not very suitable. Water-based emulsion type protective agent requires 3-5 days of health, which does not meet the needs of real-time rapid installation and construction.
Epoxy resin type protective agent
Epoxy-based protective agents are generally used as a backing for marble sheets, and can also play a role in the back protection of stone. After the marble passes through the composite epoxy resin film and adds the glass fiber mesh, it can enhance the bending, bending and shear resistance of the marble, thereby reducing the transportation and the breakage rate during the processing. A very common and common way of reinforcement and protection. The epoxy type protectant is hard, brittle, smooth and waterproof. The bridged epoxy resin has a double-structured polar functional group, which can effectively attract foreign electrons and prevent the mutual transfer of electrons, forming a material with strong insulating properties, so that the epoxy type protective agent The waterproof effect is very good, but its bonding ability is particularly poor, and it is not suitable for the back protection of stone.
If the epoxy resin film is used as the bottom protective agent, it will definitely affect the bonding performance between stone and cement, causing the stone to loosen and peel off. Now most factories use epoxy resin as the reinforcing material for the stone plate, so we When doing marble paving, the epoxy protective layer on the back of the marble will be scraped off and then laid. However, a few of the more flexible epoxy resin protectants can be used directly on the surface with a special stone backing agent for protection. However, in terms of cost considerations and the purpose of use (in order to reinforce the sheet), the factory generally uses some inferior epoxy resin protectants.
However, the Japanese have made a modification on the epoxy type protective agent. The Japanese have a defect that the epoxy resin is particularly poorly bonded. Silicone sand, enamel sand, white sand, etc. are sprinkled on the epoxy resin to improve the bonding ability of the epoxy resin protective agent by increasing the mechanical anchoring effect. This is theoretically feasible, but the actual detection results are not ideal. Because the sand itself is smooth and non-absorbent, the cement slurry itself will be isolated in the initial stage, and will be separated after drying. Therefore, the degree of bonding is not good. When there is vibration, the film will be separated, stone and The cement is still not firmly bonded.
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