High-stability polymer mortar for hydrogeological anti-seepage engineering and preparation method of high-stability polymer mortar

Abstract

The invention belongs to the technical field of polymer mortar, and particularly relates to high-stability polymer mortar for hydrogeological anti-seepage engineering and a preparation method of the high-stability polymer mortar. 10 to 25 parts of silica fume; 150 to 200 parts of quartz sand; 1-5 parts of fine rubber particles; 15 to 30 parts of acrylate copolymer emulsion; 2-5 parts of redispersible latex powder; 0.5 to 1.5 parts of a polycarboxylic acid type high-performance water reducing agent; 0.1 to 0.3 part of a defoaming agent; 0.6 to 1.2 parts of polypropylene fiber; 0.3 to 0.8 part of a water repellent; according to the scheme, by introducing the modified benzylformyl aluminoxane, the problems that existing polymer mortar is poor in anti-seepage performance, insufficient in durability and prone to cracking are solved, and the mortar has high compressive strength, breaking strength, excellent flexibility, excellent anti-seepage performance and long-term durability and is suitable for anti-seepage engineering in the severe hydrogeological environment.

Description

Technical Field

[0001] This invention belongs to the field of polymer mortar technology, specifically referring to a highly stable polymer mortar for hydrogeological seepage prevention engineering and its preparation method. Background Technology

[0002] Mortar is an important seepage prevention material in hydrogeological engineering. Due to its good impermeability and construction adaptability, it is widely used in various underground structures and water conservancy facilities. At present, polymer mortars on the market mainly modify the cement matrix by incorporating polymer components such as emulsions or resins to improve flexibility and crack resistance, thereby meeting general seepage prevention requirements. However, in the face of long-term water pressure, temperature changes and chemical erosion in complex hydrogeological environments, the stability of existing polymer mortars still needs to be improved.

[0003] The main problems with polymer mortars used for seepage prevention are insufficient interfacial bonding strength between cement and polymer phases, which easily leads to compatibility differences and affects overall toughness and damage resistance; poor impermeability under long-term water pressure, wet-dry cycles and chemical erosion, which easily causes cracks and leads to unstable durability; at the same time, uneven internal structure causes stress concentration, which reduces compressive and flexural strength and flexibility, limiting the applicability of projects. There is an urgent need for the industry to develop products with greater durability and reliability. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a polymer mortar with strong stability for hydrogeological seepage prevention engineering and its preparation method, which effectively solves the problems of weak interfacial bonding, poor impermeability, insufficient durability and easy cracking of existing polymer mortars on the market.

[0005] The technical solution adopted in this invention is as follows: This invention proposes a polymer mortar for hydrogeological seepage prevention engineering with strong stability and its preparation method, comprising the following raw materials in parts by weight: 80-120 parts of silicate cement; 10-25 parts of silica fume; 150-200 parts of quartz sand; 1-5 parts of fine rubber particles; 15-30 parts of acrylate copolymer emulsion; 2-5 parts of redispersible latex powder; 0.5-1.5 parts of polycarboxylate-based high-performance water-reducing agent; 0.1-0.3 parts of defoamer; 0.6-1.2 parts of polypropylene fiber; 0.3-0.8 parts of water-repellent agent; and 1-3 parts of modified benzyl aluminum oxane.

[0006] Furthermore, the preparation method of the modified benzyl aluminum oxane includes the following steps: S1. Add benzyl chloride and alkyl aluminum in a certain molar ratio to n-hexane, stir and mix under low temperature conditions to carry out pre-reaction, and obtain a mixture; S2. Slowly heat the mixture obtained in step S1 to the reflux temperature, and continue stirring at this temperature for a certain period of time. After the reaction is completed, cool the reaction system to room temperature, collect and obtain the reactants. S3. After filtering the reactants obtained in step S2, the precipitate was washed three times with an inert alkane solvent, and then the solvent was removed by vacuum distillation to obtain a pale yellow solid powder, namely modified benzyl aluminum oxane.

[0007] The aluminum oxane core in modified benzyl aluminum oxane hydrolyzes in an alkaline environment, forming a chemical bond with silicate cement and firmly anchoring it to the inorganic phase. At the same time, its benzyl groups are deeply embedded in polymer organic phases such as polymer emulsions and redispersible latex powders through π-π conjugation and physical entanglement, while the formyl groups provide mild crosslinking sites, enabling the inorganic cement and organic polymers to establish direct and stable chemical bond connections, forming an interpenetrating network structure that combines organic and inorganic elements. This fundamentally strengthens the interface and solves the problem of interface performance degradation under long-term osmosis and water erosion.

[0008] Further, in step S1, the molar ratio of benzyl chloride to alkyl aluminum is (1:1) to (1:1.3).

[0009] Furthermore, in step S1, the low temperature condition is -10℃ to 0℃, and the pre-reaction time is 30-60 minutes.

[0010] Furthermore, in step S2, the reflux temperature is 70-85℃ and the reaction time is 4-8 hours.

[0011] Furthermore, in step S3, the inert alkane solvent used for washing is one or more of n-hexane, n-heptane, and petroleum ether.

[0012] Furthermore, the temperature of the vacuum distillation is controlled at 40-50℃, and the vacuum degree is maintained at -0.2MPa to 0MPa.

[0013] Furthermore, the preparation method of the highly stable polymer mortar for hydrogeological seepage prevention engineering includes the following steps: Silicate cement, silica fume, redispersible latex powder, polycarboxylate-based high-performance water-reducing agent, defoamer, polypropylene fiber, and water-repellent agent are added to a mixer and mixed in a dry environment to obtain a premixed dry powder. Acrylic ester copolymer emulsion, modified benzyl aluminum oxane, and water are pre-stirred to form a liquid mixture. The premixed dry powder, quartz sand, and fine rubber particles are first added to a mixer and stirred slowly. Then, the liquid mixture is added and the mixing is switched to rapid stirring. Water is added as needed to adjust the mixture until a polymer mortar for hydrogeological seepage prevention engineering with strong stability is obtained. The mortar is then allowed to stand and mature before use.

[0014] Furthermore, the slow stirring speed is 60-80 rpm, and the stirring time is 1-2 minutes; the fast stirring speed is 120-150 rpm, and the stirring time is 3-5 minutes.

[0015] Furthermore, the settling and maturation step involves letting the mixed mortar stand for 1-2 minutes, then slowly stirring it for 30 seconds before use.

[0016] The beneficial effects achieved by this invention are as follows: (1) In this invention, modified benzyl aluminum oxane reacts chemically with silicate cement, polymer emulsion, and redispersible latex powder respectively. The aluminum oxane at one end of the molecule coordinates with the calcium hydroxide of silicate cement, while the benzyl group at the other end is chemically bonded to the polymer molecular chain, forming a strong chemical bond between inorganic silicate cement and organic polymer emulsion and redispersible latex powder. This overcomes the potential interface defects caused by compatibility differences, thereby greatly improving the integrity, toughness and damage resistance of the mortar. (2) By constructing a stable organic and inorganic interwoven network structure, modified benzyl aluminum oxane significantly reduces the penetration rate of water and other corrosive media in the mortar. Its enhanced interface area can effectively block the propagation of microcracks and the formation of interconnecting pores, making the microstructure of the mortar more compact. (3) The modified mortar has excellent impermeability and more stable long-term durability when subjected to harsh hydrogeological environments such as water pressure, wet-dry cycles and chemical erosion for a long time, effectively delaying performance degradation. (4) By introducing modified benzyl aluminum oxane, the molecular structure of the mortar hardening stage can be optimized. The polymer emulsion, redispersible latex powder and silicate cement hydration products form a uniform and continuous three-dimensional spatial network structure through chemical cross-linking, which effectively reduces the stress concentration sites inside the system. This achieves the technical effect of improving the compressive and flexural strength of the mortar while simultaneously improving its flexibility and deformation capacity and reducing the compressive-flexural ratio, thereby enhancing the crack resistance and applicability of the mortar in practical engineering applications. Attached Figure Description

[0017] Figure 1 This is a scanning electron microscope (SEM) image of the polymer mortar for hydrogeological seepage prevention engineering with strong stability proposed in this invention. Figure 2 This is a SEM (scanning electron microscope) image of the water erosion structure of a polymer mortar for hydrogeological seepage prevention engineering with strong stability proposed in this invention. Figure 3 This invention proposes a highly stable polymer mortar for hydrogeological seepage prevention engineering. Figure 2 A magnified detail of region a in the middle; Figure 4 The figure shows the test results of the flexural strength and compressive strength of a polymer mortar for hydrogeological seepage prevention engineering with strong stability proposed in this invention. Figure 5 The figure shows the test results of the impermeability and durability of a polymer mortar for hydrogeological seepage prevention engineering with strong stability proposed in this invention. Figure 6 The figure shows the test results of the flexural strength of a polymer mortar for hydrogeological seepage prevention engineering with high stability proposed in this invention. Figure 7 The figure shows the test results of the compressive strength of a polymer mortar for hydrogeological seepage prevention engineering with strong stability proposed in this invention; Figure 8 The figure shows the test results of the crack resistance of a polymer mortar for hydrogeological seepage prevention engineering with strong stability proposed in this invention. The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that, unless otherwise specified, all chemical reagents involved in this invention were purchased through commercial channels.

[0020] The silicate cement (P·O42.5 grade) used in this invention was purchased from China National Building Materials Group Co., Ltd.; silica fume (SiO2 content ≥92%, average particle size 0.1-0.3μm) was purchased from Elkem International Trading (Shanghai) Co., Ltd.; quartz sand (20-40 mesh, mud content ≤0.5%) was purchased from Lingshou County Jihong Mineral Products Trading Co., Ltd.; and fine rubber particles (particle size 0.3-1mm, apparent density 1.1-1.3g / cm³) were used. 3The following products were purchased from Dongguan Lvchuang Environmental Protection Technology Co., Ltd.: acrylate copolymer emulsion (solid content 45±2%, pH value 7-9) from Badifu Group Co., Ltd.; redispersible latex powder (solid content ≥98%, ash content 10±2%) from Wacker Chemie (China) Co., Ltd.; polycarboxylate-based high-performance water-reducing agent (liquid type, water reduction rate ≥35%) from Jiangsu Subote New Material Co., Ltd.; defoamer (organosilicon type, active ingredient ≥30%) from Deqian Chemical (Shanghai) Co., Ltd.; polypropylene fiber (tensile strength ≥350MPa) from Shandong Luxian Building Materials Technology Co., Ltd.; and water repellent agent (solvent type, solid content ≥50%) from Beijing Oriental Yuhong Waterproof Technology Co., Ltd.

[0021] Example 1:

[0022] A highly stable polymer mortar for hydrogeological seepage prevention engineering and its preparation method First, modified benzyl aluminum oxane was prepared by adding benzyl chloride and alkyl aluminum in a molar ratio of 1:1 to n-hexane and stirring at -10℃ for 30 minutes to obtain a mixture. The mixture was then slowly heated to a reflux temperature of 70℃ and stirred continuously at this temperature for 8 hours. After the reaction was completed, the reaction system was cooled to room temperature, and the reactants were collected. The reactants were filtered, and the precipitate was washed three times with n-hexane. The solvent was removed by vacuum distillation at 40℃ and -0.2MPa to obtain a pale yellow solid powder, which is the modified benzyl aluminum oxane.

[0023] Then, a polymer mortar with high stability for hydrogeological seepage prevention engineering is prepared. 80 parts silicate cement, 10 parts silica fume, 2 parts redispersible latex powder, 0.5 parts polycarboxylate-based high-performance water-reducing agent, 0.1 parts defoamer, 0.6 parts polypropylene fiber, and 0.3 parts water-repellent agent are added to a mixer and mixed in a dry environment to obtain a premixed dry powder. 15 parts acrylate copolymer emulsion, 1 part modified benzyl aluminum oxane, and water are pre-stirred evenly to form a liquid mixture. The premixed dry powder is first added to a mixer with 150 parts quartz sand and 1 part fine rubber particles and slowly stirred at 60 rpm for 2 minutes. Then, the liquid mixture is added and the speed is increased to 120 rpm for 5 minutes. Water is added as needed to adjust the mixture until a polymer mortar with high stability for hydrogeological seepage prevention engineering is obtained. The mixed mortar is allowed to stand for 1 minute, then slowly stirred for 30 seconds before use.

[0024] Example 2:

[0025] A highly stable polymer mortar for hydrogeological seepage prevention engineering and its preparation method First, modified benzyl aluminum oxane was prepared by adding benzyl chloride and alkyl aluminum in a molar ratio of 1:1.2 to n-hexane and stirring at -5°C for 45 minutes to obtain a mixture. The mixture was then slowly heated to a reflux temperature of 80°C and stirred continuously at this temperature for 6 hours. After the reaction was completed, the reaction system was cooled to room temperature, and the reactants were collected. The reactants were filtered, and the precipitate was washed three times with n-heptane. The solvent was removed by vacuum distillation at 45°C and -0.1 MPa to obtain a pale yellow solid powder, which is the modified benzyl aluminum oxane.

[0026] Then, a polymer mortar with high stability for hydrogeological seepage prevention engineering is prepared. 100 parts of silicate cement, 18 parts of silica fume, 3.5 parts of redispersible latex powder, 1 part of polycarboxylate-based high-performance water-reducing agent, 0.2 parts of defoamer, 0.9 parts of polypropylene fiber, and 0.5 parts of water-repellent agent are added to a mixer and mixed in a dry environment to obtain a premixed dry powder. 18 parts of acrylate copolymer emulsion, 2 parts of modified benzyl aluminum oxane, and water are pre-stirred evenly to form a liquid mixture. The premixed dry powder is first added to a mixer with 180 parts of quartz sand and 3 parts of fine rubber particles and slowly stirred at 70 rpm for 1.5 minutes. Then, the liquid mixture is added and the speed is increased to 130 rpm for 4 minutes. Water is added as needed to adjust the speed until a polymer mortar with high stability for hydrogeological seepage prevention engineering is obtained. The mixed mortar is allowed to stand for 2 minutes, then slowly stirred for 30 seconds before use.

[0027] Example 3:

[0028] A highly stable polymer mortar for hydrogeological seepage prevention engineering and its preparation method First, modified benzyl aluminum oxane was prepared by adding benzyl chloride and alkyl aluminum in a molar ratio of 1:1.3 to n-hexane and stirring at 0°C for 60 minutes to obtain a mixture. The mixture was then slowly heated to a reflux temperature of 85°C and stirred continuously at this temperature for 4 hours. After the reaction was completed, the reaction system was cooled to room temperature, and the reactants were collected. The reactants were filtered, and the precipitate was washed three times with petroleum ether. The solvent was removed by vacuum distillation at 50°C and 0 MPa to obtain a pale yellow solid powder, which is the modified benzyl aluminum oxane.

[0029] Then, a polymer mortar with high stability for hydrogeological seepage prevention engineering is prepared. 120 parts of silicate cement, 25 parts of silica fume, 5 parts of redispersible latex powder, 1.5 parts of polycarboxylate-based high-performance water-reducing agent, 0.3 parts of defoamer, 1.2 parts of polypropylene fiber, and 0.8 parts of water-repellent agent are added to a mixer and mixed in a dry environment to obtain a premixed dry powder. 30 parts of acrylate copolymer emulsion, 3 parts of modified benzyl aluminum oxane, and water are pre-stirred evenly to form a liquid mixture. The premixed dry powder is first added to a mixer with 200 parts of quartz sand and 5 parts of fine rubber particles and slowly stirred at 80 rpm for 1 minute. Then, the liquid mixture is added and the speed is increased to 150 rpm for 3 minutes. Water is added as needed to adjust the mixture until a polymer mortar with high stability for hydrogeological seepage prevention engineering is obtained. The mixed mortar is allowed to stand for 2 minutes, then slowly stirred for 30 seconds before use.

[0030] Comparative Example 1: The specific implementation method is the same as in Example 1, except that no modified benzyl aluminum oxane component is added.

[0031] Comparative Example 2: The specific implementation method is the same as in Example 1, except that benzyl aluminum oxane is replaced with an equal amount of active silane coupling agent KH-550.

[0032] Comparative Example 3: The specific implementation method is the same as in Example 1, except that no polymer emulsion, redispersible latex powder, or modified benzyl aluminum oxane is added.

[0033] Experimental Example 1: Six 40mm×40mm×160mm prism specimens were prepared for each of Examples 1-3 and Comparative Examples 1-3. After standard curing for 28 days, small pieces of specimens were taken from each sample, dried, sputter-coated with gold, and their microstructure and structure were observed using a scanning electron microscope. Three specimens were then subjected to a three-point flexural strength test to record the maximum load and calculate the flexural strength Rf. The six half-section specimens after the flexural test were then subjected to a compressive strength test to calculate the compressive strength Rc and the average compression-flexural ratio Rc / Rf. Subsequently, a flexural toughness test was conducted. The load-deflection curve was recorded by continuous loading at three points until the deflection reached 1 / 150 of the span L, and the toughness indices I5 and I10 were calculated. Alternatively, a splitting tensile strength test was conducted. A cylindrical specimen with a diameter of 100mm and a height of 50mm was used to apply a line load through a spacer until splitting failure, and the splitting tensile strength was calculated to quantitatively evaluate the toughness, deformation capacity, and damage resistance of the mortar.

[0034] The test results are as follows Figure 1 , Figure 4As shown, the polymer mortars of Examples 1-3 exhibit a uniform structural distribution, and the modified benzyl aluminum oxane and polymers combine to form a network structure, complementing each other and improving the microporous structure of the material, resulting in a denser mortar bond. With the introduction of modified benzyl aluminum oxane, the compressive and flexural strength of the polymer mortar shows a gradual increasing trend, while the compressive-flexural ratio decreases, the permeability coefficient is significantly reduced, and the strength loss after freeze-thaw cycles is also significantly suppressed. Compared with the control group without this component and using other modifiers, the mortar containing modified benzyl aluminum oxane exhibits superior mechanical properties, impermeability, and durability, demonstrating the effective role of this additive in improving the overall performance of mortar.

[0035] Experimental Example 2: First, for each of Examples 1-3 and Comparative Examples 1-3, a frustum-shaped specimen with a top diameter of 175 mm, a bottom diameter of 185 mm, and a height of 150 mm was prepared for the impermeability test. Simultaneously, a cylindrical specimen with a diameter of 100 mm and a height of 50 mm was prepared for the chloride ion migration test. All specimens were cured under standard conditions for 28 days. After immersing each sample in artificial seawater for 60 days, sample blocks were drilled from near the center of the sample, dried, sprayed with gold, and their microstructure was observed using a scanning electron microscope. Next, an impermeability pressure test was conducted, starting with a water pressure of 0.1 MPa and increasing by 0.1 MPa every 8 hours. The water seepage at the bottom of the specimen was observed. The test was stopped and the water pressure value was recorded when three out of six specimens showed signs of seepage. Then, the chloride ion migration coefficient was determined. The cylindrical specimen was sliced ​​and saturated with sodium hydroxide solution, then placed in a testing device with sodium chloride solution on one side and sodium hydroxide solution on the other. After applying a 30V voltage, the specimen was split open, sprayed with silver nitrate solution, and the chloride ion penetration depth was measured to obtain the migration coefficient.

[0036] The test results are as follows Figure 2 , Figure 3 , Figure 5 As shown in the scanning electron microscope results, region A is close to the surface of the specimen and has light-colored sea salt crystals attached, indicating that the water did not completely penetrate into the interior of the geopolymer specimen after erosion, proving its good impermeability. The example group with modified benzyl aluminum oxane showed a significantly higher impermeability level in the impermeability pressure test compared with the comparative example group, and also showed a significantly lower migration coefficient in the chloride ion migration coefficient determination. Among them, Example 3 had the best performance, while Comparative Example 3 had the worst performance, which fully demonstrates that modified benzyl aluminum oxane can effectively improve the impermeability and long-term durability of mortar.

[0037] Experimental Example 3: The experiment involved preparing multiple sets of 40mm×40mm×160mm prism specimens for each of Examples 1-3 and Comparative Examples 1-3 for strength testing, and preparing early crack resistance molds. First, the strength development law test was conducted, measuring the compressive strength and flexural strength of the specimens at 3 days, 7 days, and 28 days, and plotting the strength age development curves. Subsequently, the early plastic crack resistance test was conducted. Freshly mixed mortar was filled into the mold, leveled, and immediately placed in a controlled environment with a temperature of 20℃, relative humidity of 60%, and wind speed of 5m / s. The surface cracks of the mortar were observed 24 hours after the water was added, and the length and maximum width of each crack were measured. The total crack area per unit area was calculated to comprehensively evaluate the mechanical properties and crack resistance of the mortar.

[0038] The test results are as follows Figure 6 , Figure 7 , Figure 8 As shown, the mortar in the example group showed better overall performance than the comparative group in terms of flexural strength and compressive strength development, and the strength increased more significantly with age. At the same time, the early cracking area was significantly reduced. Among them, Example 3 had the best performance, while Comparative Example 3 performed the worst, which fully demonstrates that adding modified benzyl aluminum oxane can effectively improve the mechanical properties and crack resistance of mortar.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0041] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A polymer mortar for hydrogeological seepage prevention engineering with high stability, characterized in that: The raw materials include the following parts by weight: 80-120 parts silicate cement; 10-25 parts silica fume; 150-200 parts quartz sand; 1-5 parts fine rubber granules; 15-30 parts acrylate copolymer emulsion; 2-5 parts redispersible latex powder; 0.5-1.5 parts polycarboxylate-based high-performance water-reducing agent; 0.1-0.3 parts defoamer; 0.6-1.2 parts polypropylene fiber; 0.3-0.8 parts water-repellent agent; and 1-3 parts modified benzyl aluminum oxane.

2. The polymer mortar for hydrogeological seepage prevention engineering with high stability according to claim 1, characterized in that: The preparation method of the modified benzyl aluminum oxane includes the following steps: S1. Add benzyl chloride and alkyl aluminum to n-hexane according to the molar ratio, stir and mix under low temperature conditions to carry out pre-reaction, and obtain a mixture; S2. Slowly heat the mixture obtained in step S1 to the reflux temperature, and continue stirring at this temperature for a certain period of time. After the reaction is completed, cool the reaction system to room temperature, collect and obtain the reactants. S3. After filtering the reactants obtained in step S2, the precipitate was washed three times with an inert alkane solvent, and then the solvent was removed by vacuum distillation to obtain a pale yellow solid powder, namely modified benzyl aluminum oxane.

3. The polymer mortar for hydrogeological seepage prevention engineering with high stability according to claim 2, characterized in that: In step S1, the molar ratio of benzyl chloride to alkyl aluminum is (1:1) to (1:1.3).

4. The polymer mortar for hydrogeological seepage prevention engineering with high stability according to claim 3, characterized in that: In step S1, the low temperature condition is -10℃ to 0℃, and the pre-reaction time is 30-60 minutes.

5. The polymer mortar for hydrogeological seepage prevention engineering with high stability according to claim 4, characterized in that: In step S2, the reflux temperature is 70-85℃ and the reaction time is 4-8 hours.

6. The polymer mortar for hydrogeological seepage prevention engineering with high stability according to claim 5, characterized in that: In step S3, the inert alkane solvent is one or more of anhydrous diethyl ether, n-heptane, and petroleum ether.

7. The polymer mortar for hydrogeological seepage prevention engineering with high stability according to claim 6, characterized in that: The temperature of the vacuum distillation is controlled at 40-50℃, and the vacuum degree is maintained at -0.2MPa to 0MPa.

8. A method for preparing a highly stable polymer mortar for hydrogeological seepage prevention engineering according to any one of claims 1-7, characterized in that: The preparation method of the polymer mortar for hydrogeological seepage prevention engineering with high stability includes the following steps: Silicate cement, silica fume, redispersible latex powder, polycarboxylate-based high-performance water-reducing agent, defoamer, polypropylene fiber, and water-repellent agent are added to a mixer and mixed in a dry environment to obtain a premixed dry powder. Acrylic ester copolymer emulsion, modified benzyl aluminum oxane, and water are pre-stirred to form a liquid mixture. The premixed dry powder, quartz sand, and fine rubber particles are first added to a mixer and stirred slowly. Then, the liquid mixture is added and the mixing is switched to rapid stirring. Water is added as needed to adjust the mixture until a polymer mortar for hydrogeological seepage prevention engineering with strong stability is obtained. The mortar is then allowed to stand and mature before use.

9. A method for preparing a highly stable polymer mortar for hydrogeological seepage prevention engineering according to claim 8, characterized in that: The slow stirring speed is 60-80 rpm, and the stirring time is 1-2 minutes; the fast stirring speed is 120-150 rpm, and the stirring time is 3-5 minutes.

10. The method for preparing a highly stable polymer mortar for hydrogeological seepage prevention engineering according to claim 9, characterized in that: The settling and maturation step involves letting the mixed mortar stand for 1-2 minutes, then slowly stirring it for 30 seconds before use.

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