Reinforcing material for earthen archaeological site protection and preparation method thereof

Abstract

The invention provides a reinforcing material for earthen archaeological site protection and a preparation method thereof, and belongs to the technical field of reinforcing materials. The invention discloses a reinforcing material for earthen ruins protection. The reinforcing material is prepared from the following raw materials in percentage by mass: 55-65% of fluorosilicone modified acrylic emulsion, 10-20% of potassium methyl silicate, 0.5-2% of a dispersion stabilizer, 0.1-0.5% of a regulator, 0.5-1.5% of a coupling agent, 0-3% of a penetration enhancer and the balance of deionized water. The reinforcing material for protecting the earthen ruins is provided to improve the permeability of the reinforcing material and improve the pressure resistance and weather resistance of the earthen ruins.

Description

Technical Field

[0001] The invention belongs to the technical field of reinforcement materials, and in particular relates to a reinforcement material for protecting earthen ruins and a preparation method thereof. Background Art

[0002] As an important historical and cultural city in China, Luoyang has many earthen sites, and the protection of these sites has always been an important topic in the field of cultural relics protection. In recent years, with the continuous advancement of science and technology, Luoyang has made remarkable progress in the protection of earthen sites, especially in the application of reinforcement materials and their technology.

[0003] At present, the commonly used reinforcement materials in the protection of Luoyang earthen sites include ethyl orthosilicate, silicone-acrylic emulsion, silicone-fluorine materials and PS. These materials have shown good effects in improving the compressive strength, shear strength and water resistance of earthen sites. However, these materials also have some problems in practical applications, such as the possible impact on the appearance and microstructure of the site. Therefore, when selecting reinforcement materials, it is necessary to comprehensively consider the specific conditions of the site to ensure the reinforcement effect and the integrity of the site.

[0004] Wang Jiakun et al. (Wang Jiakun, Zhou Shuanglin. Research on the permeability of non-aqueous dispersion materials for earthen site reinforcement [J]. Research on the Protection of Grottoes and Earthen Sites, 2022 (2).) pointed out that reinforcing and penetrating earthen sites with chemical materials is one of the more effective means to protect earthen site cultural relics. Acrylic resin non-aqueous dispersion materials have the advantages of good reinforcement strength and good permeability. They have been used in actual protection work, but there are still certain problems. Therefore, the author has improved the preparation materials and preparation process of acrylic resin non-aqueous dispersion materials, and improved the preparation efficiency and permeability of the materials. For example, Chinese patent application document CN118853185A discloses a silicone reinforcement agent for earthen site protection and its preparation method and application. The organosilicon reinforcement agent includes a basic reinforcement component group, a hydrophobic and waterproof component group, a reinforcing component group, and a solvent and dispersant group, wherein the basic reinforcement component group includes tetraethyl orthosilicate, γ-aminopropyl triethoxysilane, and γ-glycidyl ether propyl trimethoxysilane; the hydrophobic and waterproof component group includes polymethyl hydrogen siloxane and hydroxy silicone oil; the reinforcing component group is nanoparticles; and the solvent and dispersant are organic solvents. When this technology is applied to the reinforcement and protection of earthen sites, it is evenly injected into the soil through grouting equipment to provide additional mechanical support, and through regular inspection and maintenance, the long-term stability of the reinforcement effect is ensured. This invention solves the problems of poor reinforcement effect and easy cracking of the generated products in the prior art, and has significant application prospects.

[0005] Although existing earthen site protection and reinforcement materials continue to emerge, there are still some problems. For example, the compressive strength of soil reinforced with solidifying materials is limited, and the performance in terms of weather resistance, waterproofing and / or salt resistance is insufficient. There is a lack of durability data, making it difficult to effectively resolve the contradiction between "in-situ protection" and "environmental erosion" of the site. Therefore, the continuous development of new composite reinforcement materials is still the key to breaking through this dilemma. Summary of the invention

[0006] In view of this, the first object of the present invention is to provide a reinforcement material for protecting earthen ruins, so as to improve the permeability of the reinforcement material and enhance the compression resistance and weather resistance of the ruins soil.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a reinforcement material for the protection of earthen ruins, which is made of the following raw materials in percentage by mass: 55-65% of fluorosilicone modified acrylic emulsion, 10-20% of potassium methyl silicate, 0.5-2% of dispersion stabilizer, 0.1-0.5% of regulator, 0.5-1.5% of coupling agent, 0-3% of penetration enhancer, and the balance is deionized water.

[0008] Optionally, the viscosity of the fluorosilicone modified acrylic emulsion at 25° C. is 500-2000 mPa.s.

[0009] Optionally, the dispersion stabilizer is sodium polyacrylate or dispersant PA-30.

[0010] Optionally, the regulator is a combination of citrate and 2-amino-2-methyl-1-propanol, and the mass ratio of the two is 1:(0.1~0.3).

[0011] Optionally, the coupling agent is a silane coupling agent, and may be vinyl trimethoxy silane or γ-glycidyloxypropyl trimethoxy silane.

[0012] Optionally, the penetration enhancer is polyethylene glycol 400 or polyethylene glycol octylphenyl ether.

[0013] The second object of the present invention is to provide a method for preparing a reinforcement material for protecting earthen ruins, thereby maintaining the stability of the material properties.

[0014] A method for preparing a reinforcement material for protecting earthen ruins comprises the following steps: S1: at 25-30°C, under stirring conditions, the dispersion stabilizer and deionized water are mixed to prepare a dispersion; S2: Raise the temperature to 30-35°C, slowly drop the diluted potassium methyl silicate solution into the dispersion, and after the dropwise addition is complete, stir until uniform; S3: adding the regulator to the mixed solution obtained in S2 in batches to adjust the pH to 8.5-9.0; S4: adding the coupling agent to the mixed solution obtained in S3 and stirring evenly; S5: Under low-speed stirring conditions, add the fluorosilicone-modified acrylic emulsion to the mixed solution obtained in S4, mix for 20-30 minutes, then add the penetrant, mix evenly, and obtain the product.

[0015] Optionally, the potassium methyl silicate in S2 is diluted to a concentration of 2-2.5%, and the dropping speed is 2-3 mL / min.

[0016] Optionally, the step of adding the regulator to the mixed solution obtained in S2 in batches in S3 includes: adding the regulator to the mixed solution, adjusting the pH to 10-10.5, and stirring for 5-10 minutes; adding the remaining regulator to the mixed solution, adjusting the pH to 8.5-9.0, and stirring for 5-10 minutes.

[0017] Optionally, the rotation speed of the low-speed stirring in S5 is 300-500 rpm.

[0018] Fluorosilicone-modified acrylic emulsion has been widely used in the field of exterior wall coatings due to its excellent resistance to ultraviolet rays, temperature changes, acid rain and low surface energy. However, there are significant differences between the physical properties of building exterior wall materials and ruins soil. Previous studies have shown that the effect of fluorosilicone-modified acrylic emulsion directly used for the reinforcement of ruins soil is not ideal. The main problems include: (1) It is difficult to effectively penetrate the microporous structure of the ruins soil, resulting in limited reinforcement depth; (2) The binding ability with the ruins soil is weak, making it difficult to form a stable reinforcement layer; (3) The compressive strength is limited. Potassium methyl silicate (CH3KO3Si) is a building waterproof material and is widely used in waterproofing projects of materials such as stone, ceramics, and cement mortar. Its application in the protection of earthen ruins has also attracted attention, but the actual effect is still unclear. For this reason, the present invention selects fluorosilicone-modified acrylic emulsion and potassium methyl silicate for combined use to improve soil strength and reinforcement effect, in order to provide new ideas for the protection of earthen ruins.

[0019] In the present invention, fluorosilicone modified acrylic emulsion and potassium methyl silicate are synergistically enhanced to form an integrated waterproofing-reinforcement system. Potassium methyl silicate (diluted to a concentration of less than 3%) can penetrate into the soil, react with CO2, fill pores and improve compressive strength; and form a "solid inside and hydrophobic outside" structure with fluorosilicone modified acrylic emulsion. The alkaline nature of potassium methyl silicate can activate the silane coupling agent in the material to enhance the interfacial bonding force. Potassium methyl silicate provides rapid surface waterproofing, and the fluorosilicone modified acrylic emulsion achieves deep reinforcement and long-term hydrophobicity. At the same time, the fluorosilicone segments resist ultraviolet degradation, the methyl silicate film prevents rain erosion, and the weather resistance is improved. It can adapt to more complex external environments and significantly improve the durability of the reinforcement material.

[0020] The present invention uses a safer auxiliary agent, and the reinforcement material exhibits good permeability and reinforcement effect, and can also significantly improve the water resistance, alkali and salt resistance, and aging resistance of the earthen ruins. In addition, the reinforcement material of the present invention has good compatibility with the earthen ruins substrate, and can enhance its mechanical strength and compressive strength without significantly changing the original appearance, glossiness, and weight of the earthen ruins. Therefore, the scheme of the present invention can give full play to the rapid waterproofing advantage of potassium methyl silicate and the deep reinforcement characteristics of fluorosilicone modified acrylic emulsion, and achieve a comprehensive improvement in waterproofness, mechanical strength, and weather resistance in the protection of ruins soil.

[0021] In addition, the present invention adopts a sophisticated preparation method based on the physical properties of fluorosilicone modified acrylic emulsion, potassium methyl silicate and various additives to obtain a reinforcement material with high uniformity and stable performance. In the preparation process, first, at 25-30°C, add water to the stabilizing dispersant to form a dispersion to improve the subsequent dissolution efficiency; then slowly drip a dilution of potassium methyl silicate at 30-35°C to avoid local high alkali; then adjust the pH in batches to give full play to the pH adjustment effect of the raw materials, adjust the solution to 8.5-9.0, and keep its pH stable; then add the coupling agent with slow stirring to promote the coupling reaction; then add the fluorosilicone modified acrylic emulsion, slowly add it at a low speed to prevent the mixed solution from flocculation or stratification; finally, selectively add the penetration enhancer, and stir slowly to ensure uniform mixing without stratification to ensure the use effect. Through the above-mentioned refined operations, a reinforcement material with better stability is obtained, in order to play a better long-term protective role for the earthen ruins.

[0022] The pH value of the reinforcement material of the present invention is 8.5-9.0, and the penetration depth of the knife scraping test is ≥10mm; in the unconfined compression test, the strength is increased by more than 4 times after treatment; the mass loss rate is ≤3% after UV aging for 1000h; after immersion in water for 7 days, the soil mass loss rate should be ≤0.5%; after 5% NaCl spraying for 720h, there is no powdering or peeling on the surface. DETAILED DESCRIPTION

[0023] In order to better understand the present invention, the content of the present invention is further clearly set forth in conjunction with the embodiments below, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0024] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0025] Unless otherwise specified, all raw materials are from commercially available products and do not contain other unspecified components except inevitable impurities unless otherwise specified.

[0026] In the following scheme, the viscosity of the fluorosilicone modified acrylic emulsion at 25°C is 500-2000 mPa.s, and it is a commercially available product.

[0027] Example 1: A reinforcement material for the protection of earthen ruins is made of the following raw materials in percentage by mass: 55% fluorosilicone modified acrylic emulsion, 15% potassium methyl silicate, 0.5% dispersion stabilizer, 0.2% regulator, 0.5% coupling agent, 3% penetration enhancer, and the balance is deionized water. Among them, the dispersion stabilizer is sodium polyacrylate; the regulator is a combination of citrate and 2-amino-2-methyl-1-propanol, the mass ratio of the two is 1:0.1; the coupling agent is vinyl trimethoxy silane; the penetration enhancer is polyethylene glycol 400.

[0028] A method for preparing a reinforcement material for protecting earthen ruins comprises the following steps: S1: at 25°C, under stirring, the dispersion stabilizer and deionized water are mixed to prepare a dispersion; S2: Raise the temperature to 30°C, slowly drop the diluted potassium methyl silicate solution into the dispersion, and after the dropwise addition is complete, stir until uniform; S3: adding the regulator to the mixed solution obtained in S2 in batches to adjust the pH to 8.5; S4: adding the coupling agent to the mixed solution obtained in S3 and stirring evenly; S5: Under low-speed stirring conditions, add the fluorosilicone-modified acrylic emulsion to the mixed solution obtained in S4, mix for 20 minutes, then add the penetrant, mix evenly, and obtain the product.

[0029] Wherein, in S2, the dropping speed of potassium methyl silicate is 2 mL / min. Potassium methyl silicate is diluted to a concentration of 2%, that is: 20 g of potassium methyl silicate is added to 1 L of deionized water for dilution. In S3, the regulator is added to the mixed solution obtained in S2 in batches, including: adding the regulator to the mixed solution, adjusting the pH to 10, and stirring for 5 minutes; adding the remaining regulator to the mixed solution, adjusting the pH to 8.5, and stirring for 10 minutes. In S5, the rotation speed of low-speed stirring is 350 rpm.

[0030] Example 2: A reinforcement material for the protection of earthen ruins is made of the following raw materials in percentage by mass: 57% fluorosilicone modified acrylic emulsion, 20% potassium methyl silicate, 0.7% dispersion stabilizer, 0.5% regulator, 1.3% coupling agent, 2.5% penetration enhancer, and the balance is deionized water. Among them, the dispersion stabilizer is dispersant PA-30 (aqueous solution of sodium acrylic acid salt); the regulator is a combination of citrate and 2-amino-2-methyl-1-propanol, and the mass ratio of the two is 1:0.2; the coupling agent is γ-glycidyloxypropyl trimethoxysilane; and the penetration enhancer is polyethylene glycol octylphenyl ether.

[0031] A method for preparing a reinforcement material for protecting earthen ruins comprises the following steps: S1: at 27°C, under stirring, the dispersion stabilizer and deionized water are mixed to prepare a dispersion; S2: Raise the temperature to 32°C, slowly drop the diluted potassium methyl silicate solution into the dispersion, and after the dropwise addition is complete, stir until uniform; S3: adding the regulator to the mixed solution obtained in S2 in batches to adjust the pH to 8.6; S4: adding the coupling agent to the mixed solution obtained in S3 and stirring evenly; S5: Under low-speed stirring conditions, add the fluorosilicone-modified acrylic emulsion to the mixed solution obtained in S4, mix for 25 minutes, then add the penetrant, mix evenly, and obtain the product.

[0032] Wherein, in S2, the dropping speed of potassium methyl silicate is 2.5 mL / min. Potassium methyl silicate is diluted to a concentration of 2.3%, that is: 23 g of potassium methyl silicate is added to 1 L of deionized water for dilution. In S3, the regulator is added to the mixed solution obtained in S2 in batches, including: adding the regulator to the mixed solution, adjusting the pH to 10.1, and stirring for 6 minutes; adding the remaining regulator to the mixed solution, adjusting the pH to 8.6, and stirring for 8 minutes. In S5, the rotation speed of low-speed stirring is 400 rpm.

[0033] Example 3: A reinforcement material for the protection of earthen ruins is made of the following raw materials in percentage by mass: 58.5% fluorosilicone modified acrylic emulsion, 18% potassium methyl silicate, 0.8% dispersion stabilizer, 0.4% regulator, 1.3% coupling agent, 2.1% penetration enhancer, and the balance is deionized water. Among them, the dispersion stabilizer is dispersant PA-30; the regulator is a composition of citrate and 2-amino-2-methyl-1-propanol, the mass ratio of the two is 1:0.2; the coupling agent is γ-glycidyloxypropyl trimethoxysilane; the penetration enhancer is polyethylene glycol 400.

[0034] A method for preparing a reinforcement material for protecting earthen ruins comprises the following steps: S1: at 30°C, under stirring, the dispersion stabilizer and deionized water are mixed to prepare a dispersion; S2: Raise the temperature to 35°C, slowly drop the diluted potassium methyl silicate solution into the dispersion, and after the dropwise addition is complete, stir until uniform; S3: adding the regulator to the mixed solution obtained in S2 in batches to adjust the pH to 9.0; S4: adding the coupling agent to the mixed solution obtained in S3 and stirring evenly; S5: Under low-speed stirring conditions, add the fluorosilicone-modified acrylic emulsion to the mixed solution obtained in S4, mix for 30 minutes, then add the penetrant, mix evenly, and obtain the product.

[0035] Wherein, in S2, the dropping speed of potassium methyl silicate is 3 mL / min. Potassium methyl silicate is diluted to a concentration of 2.5%, that is: 25 g of potassium methyl silicate is added to 1 L of deionized water for dilution. In S3, the regulator is added to the mixed solution obtained in S2 in batches, including: adding the regulator to the mixed solution, adjusting the pH to 10.5, and stirring for 10 minutes; adding the remaining regulator to the mixed solution, adjusting the pH to 9.0, and stirring for 7 minutes. In S5, the rotation speed of low-speed stirring is 500 rpm.

[0036] Example 4: A reinforcement material for the protection of earthen ruins is made of the following raw materials in percentage by mass: 60% fluorosilicone-modified acrylic emulsion, 16% potassium methyl silicate, 1% dispersion stabilizer, 0.3% regulator, 1.2% coupling agent, 1.7% penetration enhancer, and the balance is deionized water. Among them, the dispersion stabilizer is sodium polyacrylate; the regulator is a combination of citrate and 2-amino-2-methyl-1-propanol, the mass ratio of the two is 1:0.3; the coupling agent is vinyl trimethoxy silane; the penetration enhancer is polyethylene glycol octyl phenyl ether.

[0037] The preparation method of the above-mentioned reinforcement material for protecting earthen ruins in this embodiment, its steps and process parameters refer to those of Example 1.

[0038] Example 5: A reinforcement material for the protection of earthen ruins is made of the following raw materials in percentage by mass: 61.5% fluorosilicone modified acrylic emulsion, 12% potassium methyl silicate, 1.2% dispersion stabilizer, 0.2% regulator, 0.9% coupling agent, 1.1% penetration enhancer, and the balance is deionized water. Among them, the dispersion stabilizer is dispersant PA-30; the regulator is a composition of citrate and 2-amino-2-methyl-1-propanol, and the mass ratio of the two is 1:0.3; the coupling agent is γ-glycidyloxypropyl trimethoxysilane; and the penetration enhancer is polyethylene glycol octylphenyl ether.

[0039] The preparation method of the above-mentioned reinforcement material for protecting earthen ruins in this embodiment, its steps and process parameters refer to those of Example 1.

[0040] Example 6: A reinforcement material for the protection of earthen ruins is made of the following raw materials in percentage by mass: 62% fluorosilicone-modified acrylic emulsion, 13% potassium methyl silicate, 1.5% dispersion stabilizer, 0.2% regulator, 1.0% coupling agent, 0.8% penetration enhancer, and the balance is deionized water. Among them, the dispersion stabilizer is sodium polyacrylate; the regulator is a combination of citrate and 2-amino-2-methyl-1-propanol, and the mass ratio of the two is 1:0.23; the coupling agent is γ-glycidyloxypropyl trimethoxysilane; and the penetration enhancer is polyethylene glycol octylphenyl ether.

[0041] The preparation method of the above-mentioned reinforcement material for protecting earthen ruins in this embodiment, its steps and process parameters refer to those of Example 1.

[0042] Example 7: A reinforcement material for the protection of earthen ruins is made of the following raw materials in percentage by mass: 63% fluorosilicone-modified acrylic emulsion, 10% potassium methyl silicate, 1.7% dispersion stabilizer, 0.1% regulator, 0.7% coupling agent, 0.5% penetration enhancer, and the balance is deionized water. Among them, the dispersion stabilizer is sodium polyacrylate; the regulator is a combination of citrate and 2-amino-2-methyl-1-propanol, and the mass ratio of the two is 1:0.1; the coupling agent is γ-glycidyloxypropyl trimethoxysilane; and the penetration enhancer is polyethylene glycol 400.

[0043] The preparation method of the above-mentioned reinforcement material for protecting earthen ruins in this embodiment, its steps and process parameters refer to those of Example 1.

[0044] Example 8: A reinforcement material for the protection of earthen ruins is made of the following raw materials in percentage by mass: 65% fluorosilicone-modified acrylic emulsion, 17% potassium methyl silicate, 2% dispersion stabilizer, 0.3% regulator, 1.5% coupling agent, and the balance is deionized water. Among them, the dispersion stabilizer is dispersant PA-30; the regulator is a combination of citrate and 2-amino-2-methyl-1-propanol, and the mass ratio of the two is 1:0.15; the coupling agent is γ-glycidyloxypropyltrimethoxysilane.

[0045] The steps and process parameters of the method for preparing the reinforcing material for protecting earthen ruins in this embodiment are the same as those in Example 1, and the step of adding the permeability enhancer is omitted.

[0046] Comparative Example 1: The difference from Example 1 is that fluorosilicone-modified acrylic emulsion is used as the reinforcement material for the protection of earthen ruins.

[0047] Comparative Example 2: The difference from Example 1 is that potassium methyl silicate is used as a reinforcement material for protecting earthen ruins, and the potassium methyl silicate is diluted to a concentration of 2%.

[0048] Comparative Example 3: A reinforcement material for protecting earthen ruins is prepared from the following raw materials in percentage by mass: 45% fluorosilicone-modified acrylic emulsion, 25% potassium methyl silicate, 0.5% dispersion stabilizer, 0.2% regulator, 0.5% coupling agent, 3% penetration enhancer, and the balance is deionized water. The remaining parameters and preparation method are the same as those in Example 1.

[0049] Comparative Example 4: The raw materials and proportions of a reinforcement material for the protection of earthen ruins are the same as those in Example 1, and its preparation method comprises the following steps: S1: at 25°C, under stirring conditions, a dispersion stabilizer, a diluent of potassium methyl silicate and a regulator are mixed, and stirred evenly to obtain a mixed solution; S2: fluorosilicone-modified acrylic emulsion, a coupling agent and a penetrant are added to the above mixed solution in sequence, and stirred evenly to obtain a product.

[0050] Next, the contents of the evaluation test will be described.

[0051] The original soil near a certain earthen site in Luoyang City, Henan Province was collected, and soil samples (diameter 10 cm, height 5 cm) were prepared by the ring knife method. The reinforcement materials prepared in Examples 1-8 and Comparative Examples 1-4 were used for reinforcement experiments. The reinforcement materials were respectively sucked with a syringe and dripped on the soil samples until the reinforcement materials completely wetted the back of the soil samples. After natural air drying for three days and nights, the second reinforcement was performed to observe the color change phenomenon and penetration status of the soil sample surface. The observation results are recorded as follows: Table 1 Reinforcement penetration time and surface change results

[0052] The above results show that when the reinforcement material of the present invention is used to reinforce the surface of the soil sample, the color of the soil sample does not change significantly, and at the same time, the defect of the soil sample being white in color caused by the single use of fluorosilicone modified acrylic emulsion can be improved.

[0053] After the above soil samples were reinforced, the performance of the reinforcement materials was measured in accordance with the Geotechnical Test Method Standard GB / T50123-2019. The results are shown in the following table: Table 2 Performance test results of reinforcement materials

[0054] The results show that: (1) The density of the soil samples changed after being reinforced with different reinforcement materials, but the change was not large and the difference was not obvious. (2) After the soil samples were reinforced with different reinforcement materials, the porosity ratio decreased, indicating that the reinforcement materials filled part of the voids in the soil samples, but the change in the porosity ratio was also small and there was no obvious difference. (3) The penetration depth of the soil samples reinforced with the reinforcement materials of Examples 1-8 was greater than 8 mm, while the reinforcement materials of Comparative Examples 1-4 were all less than 8 mm, indicating that the penetration performance of the reinforcement materials of the present invention was more significant. (4) The unconfined compressive strength of the soil samples reinforced with the reinforcement materials of Examples 1-8 increased by more than 4 times, which was more obvious than the improvement effect of conventional reinforcement materials. At the same time, there was also a significant difference compared with Comparative Examples 1-4, indicating that the compound use of fluorosilicone modified acrylic emulsion and potassium methyl silicate had a significant synergistic effect on the improvement of the unconfined compressive strength of the soil samples. (5) The anti-ultraviolet aging performance of the soil samples reinforced with the reinforcement materials of Examples 1-8 was improved by more than 60%, which was more significant than Comparative Examples 1-4. (6) After being reinforced with the reinforcement materials of Examples 1-8, the waterproof performance of the soil samples is significantly improved, which can effectively prevent flood damage. (7) After being reinforced, the salt resistance of the soil samples is enhanced, and the salt tolerance is improved.

[0055] It can be seen that the reinforcement material obtained by the present invention with fluorosilicone-modified acrylic emulsion and potassium methyl silicate as main components, through reasonable compounding and fine preparation, can significantly improve the compression resistance, weather resistance, waterproofness and salt resistance of soil samples to varying degrees, and is expected to be further used in the protection of earthen sites.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A reinforcement material for protecting earthen ruins, characterized in that: The invention is prepared from the following raw materials in percentage by weight: 55-65% of fluorosilicone modified acrylic emulsion, 10-20% of potassium methyl silicate, 0.5-2% of dispersion stabilizer, 0.1-0.5% of regulator, 0.5-1.5% of coupling agent, 0-3% of penetration enhancer, and the balance is deionized water.

2. The reinforcing material for protecting earthen ruins according to claim 1, characterized in that: The viscosity of the fluorosilicone modified acrylic emulsion at 25° C. is 500-2000 mPa.s.

3. The reinforcing material for protecting earthen ruins according to claim 1, characterized in that: The dispersion stabilizer is sodium polyacrylate or dispersant PA-30.

4. The reinforcing material for protecting earthen ruins according to claim 1, characterized in that: The regulator is a composition of citrate and 2-amino-2-methyl-1-propanol, and the mass ratio of the two is 1: (0.1-0.3).

5. The reinforcing material for protecting earthen ruins according to claim 1, characterized in that: The coupling agent is vinyl trimethoxy silane or γ-glycidyl ether oxypropyl trimethoxy silane.

6. The reinforcing material for protecting earthen ruins according to claim 1, characterized in that: The penetration enhancer is polyethylene glycol 400 or polyethylene glycol octylphenyl ether.

7. A method for preparing a reinforcing material for protecting earthen ruins according to any one of claims 1 to 6, characterized in that: It includes the following steps: S1: at 25-30°C, under stirring, the dispersion stabilizer and deionized water are mixed to prepare a dispersion; S2: Raise the temperature to 30-35°C, slowly drop the diluted potassium methyl silicate solution into the dispersion, and after the dropwise addition is complete, stir until uniform; S3: adding the regulator to the mixed solution obtained in S2 in batches to adjust the pH to 8.5-9.0; S4: adding the coupling agent to the mixed solution obtained in S3 and stirring evenly; S5: Under low-speed stirring conditions, add the fluorosilicone-modified acrylic emulsion to the mixed solution obtained in S4, mix for 20-30 minutes, then add the penetrant, mix evenly, and obtain the product.

8. The method for preparing a reinforcing material for protecting earthen ruins according to claim 7, characterized in that: The potassium methyl silicate in S2 is diluted to a concentration of 2-2.5%, and the dropping speed is 2-3 mL / min.

9. The method for preparing a reinforcing material for protecting earthen ruins according to claim 7, characterized in that: The step of adding the regulator to the mixed solution obtained in step S2 in batches comprises: adding the regulator to the mixed solution, adjusting the pH to 10-10.5, and stirring for 5-10 minutes; adding the remaining regulator to the mixed solution, adjusting the pH to 8.5-9.0, and stirring for 5-10 minutes.

10. The method for preparing a reinforcing material for protecting earthen ruins according to claim 7, characterized in that: The rotation speed of the low-speed stirring in S5 is 300-500 rpm.

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