Sewage pool body leakage repairing agent for sewage treatment construction as well as preparation method and construction process of sewage pool body leakage repairing agent

Abstract

The invention provides an in-use sewage pool body leakage repairing agent as well as a preparation method and a construction process thereof, and relates to the technical field of pool body anti-seepage transformation. The sewage pool body leakage repairing agent is prepared from the following raw materials in parts by weight: 30-40 parts of polyurethane resin, 20-30 parts of epoxy resin, 5-10 parts of an isocyanate curing agent, 1-3 parts of polyether modified silicone oil, 3-6 parts of ceramic powder, 1-3 parts of carbon fibers, 0.5-1 part of a silane coupling agent, 2-5 parts of propylene glycol diglycidyl ether, 0.3-0.5 part of an acid and alkali resistant anti-aging agent and 0.3-0.5 part of an anti-ultraviolet agent. By optimizing the component proportion of the leak repairing agent, the leak repairing agent has the characteristic of rapid solidification under a low-temperature condition, and has the effects of high strength, micro-expansion, good compactness and long-term performance; meanwhile, a temporary water storage bag, a temporary pump and a pipeline are adopted, so that the sewage treatment process is not interrupted when the leakage of the sewage pool body is repaired.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewage treatment, and particularly relates to a sewage pool body leakage repairing agent for sewage treatment construction, a preparation method thereof and a construction process. BACKGROUND

[0002] The sewage treatment station or sewage treatment plant is an important part of a chemical enterprise or a chemical park, and the leakage problem of the sewage pool is particularly prominent. Due to uneven settlement of the foundation and other factors, the rigid structure is prone to cracking and leakage to different degrees, resulting in external leakage of the liquid in the sewage pool and causing pollution to the environment; traditional leakage plugging methods, such as direct plugging, pipe plugging, and wedge plugging, can only be used for specific construction environments and conditions, and are difficult to adapt to different types of leakage.

[0003] The prior art has made some researches on the sewage pool body leakage repairing agent. For example, Chinese Invention Patent CN104342086B discloses a leakage repairing agent, which comprises petroleum resin, a compatible solvent, a modifier, a curing agent, active calcium carbonate, a plasticizer, a coupling agent, white carbon black, ethylene wax, calcium stearate, a pigment, an antioxidant, and an ultraviolet resistant agent. The leakage repairing agent has strong bonding strength, good elasticity, can tightly plug cracks regardless of thermal expansion and cold contraction, and has good high and low temperature resistance. However, the leakage repairing agent still has problems in the optimization of component proportions, and needs to be further improved to improve the performance. Chinese Invention Patent Application CN113402241A discloses a leakage repairing material for underwater leakage channels of deep water buildings and a use method thereof. The material is composed of cement concrete A combination and cementing material B component. However, the application still has problems of insufficient compactness and long-term nature of the leakage repairing material, and the components need to be further optimized.

[0004] At the same time, most of the existing pool body anti-leakage reconstruction technologies require the pool body to stop running, be emptied and cleaned before construction, including re-laying an anti-leakage layer, carrying out crack grouting reinforcement, or using a high polymer material for overall lining. Such traditional methods have obvious disadvantages such as long construction period, large land occupation requirement, complete water and production stop, etc., and are often difficult to implement for in-production parks (enterprises), landfills or hazardous waste disposal sites with no standby pool. In particular, for sewage treatment systems that need to be continuously operated, once the water inlet and outlet are cut off, secondary environmental problems such as sewage retention, system paralysis, and accumulation of foul odor will occur; at the same time, the construction of a standby pool or a temporary system not only requires a large investment, but also has a long period.

[0005] Therefore, it is urgent to develop a leakage repairing material that can quickly solidify at low temperature, has high strength and micro-expansion effect, has good compactness and long-term nature, to effectively repair leakage and prevent water damage, and at the same time, a new construction process that can quickly, waterproofly and reliably repair the anti-leakage of the in-use pool body during the continuous production of the enterprise. SUMMARY

[0006] This invention addresses the problems existing in the prior art by providing a sewage tank leakage repair agent for sewage treatment construction, its preparation method, and construction process. By optimizing the components and proportions, the obtained sewage tank leakage repair agent exhibits rapid solidification characteristics under low-temperature conditions, and possesses high strength, micro-expansion, and good compactness and long-term performance. Simultaneously, by employing temporary water storage bags, temporary pumps, and pipelines, the process is not interrupted when leakage occurs in the sewage tank.

[0007] The first aspect of the present invention relates to a leak repair agent for sewage tanks used in sewage treatment construction, the leak repair agent being made from the following raw materials in parts by weight: 30-40 parts polyurethane resin, 20-30 parts epoxy resin, 5-10 parts isocyanate curing agent, 1-3 parts polyether modified silicone oil, 3-6 parts ceramic powder, 1-3 parts carbon fiber, 0.5-1 part silane coupling agent, 2-5 parts propylene glycol diglycidyl ether, 0.3-0.5 parts acid and alkali resistant antioxidant, and 0.3-0.5 parts UV resistant agent.

[0008] Preferably, the sewage tank leakage repair agent is made from the following raw materials in parts by weight: 30 parts polyurethane resin, 25 parts epoxy resin, 6 parts isocyanate curing agent, 2 parts polyether modified silicone oil, 3 parts ceramic powder, 3 parts carbon fiber, 0.5 parts silane coupling agent, 5 parts propylene glycol diglycidyl ether, 0.3 parts acid and alkali resistant antioxidant, and 0.5 parts UV resistant agent.

[0009] Preferably, the sewage tank leakage repair agent is made from the following raw materials in parts by weight: 40 parts polyurethane resin, 23 parts epoxy resin, 10 parts isocyanate curing agent, 3 parts polyether modified silicone oil, 6 parts ceramic powder, 1 part carbon fiber, 1 part silane coupling agent, 2 parts propylene glycol diglycidyl ether, 0.5 parts acid and alkali resistant antioxidant, and 0.3 parts UV resistant agent.

[0010] Preferably, the sewage tank leakage repair agent is made from the following raw materials in parts by weight: 36 parts polyurethane resin, 24 parts epoxy resin, 7.5 parts isocyanate curing agent, 1.5 parts polyether modified silicone oil, 4 parts ceramic powder, 2 parts carbon fiber, 0.7 parts silane coupling agent, 3.5 parts propylene glycol diglycidyl ether, 0.4 parts acid and alkali resistant antioxidant, and 0.4 parts UV stabilizer.

[0011] Preferably, the polyurethane resin is selected from at least one of SikaFix-108 and XS-G119.

[0012] Preferably, the epoxy resin is selected from at least one of YH-102 and XT-108.

[0013] Preferably, the mass ratio of the polyurethane resin to the epoxy resin is 1.2-1.8:1.

[0014] Preferably, the isocyanate curing agent is a polymeric MDI (diphenylmethane diisocyanate) curing agent.

[0015] Further preferably, the polymeric MDI curing agent is selected from at least one of Desmodur 44V20L and Desmodur E.

[0016] Preferably, the polyether-modified silicone oil is a non-ionic polyether-modified silicone oil.

[0017] Further preferably, the non-ionic polyether-modified silicone oil is selected from at least one of Dow Corning L-3600, DY-ET400R, DY-ET139, RH-NB-6505, SH-204A, SM-9102 and Silor SW88.

[0018] Preferably, the mass ratio of the isocyanate curing agent to the polyether-modified silicone oil is 3-6:1.

[0019] Preferably, the ceramic powder is selected from at least one of 95 ceramic powder and zirconia ceramic powder.

[0020] Preferably, the carbon fiber is a short-cut carbon fiber.

[0021] Further preferably, the short-cut carbon fiber is selected from at least one of Toho HTA-C600 and Mitsubishi Rayon T300.

[0022] Preferably, the silane coupling agent is selected from at least one of KH-550 and KH-570.

[0023] Preferably, the acid and alkali resistant antioxidant is selected from at least one of antioxidant RD and antioxidant 1010.

[0024] Preferably, the anti-ultraviolet agent is selected from at least one of UV-531 and UV-327.

[0025] The second aspect of the present application relates to a preparation method of the sewage pool body leakage repairing agent described above, comprising the following preparation steps: (1) polyurethane resin, epoxy resin are respectively added into a stirring tank preheated to 40-50℃, and stirred at 50-80rpm for 10-15min; (2) the preheated epoxy resin is added into the polyurethane resin, and stirred at 80-100rpm for 20-25min while maintaining the temperature at 40-50℃, to obtain a mixed resin system; (3) drop the propylene glycol diglycidyl ether into the mixed resin system, and stir at 80-100rpm for 15-20min; (4) Spraying silane coupling agent to the ceramic powder and carbon fiber, and adding the coupling agent treated ceramic powder and carbon fiber into step (3) in batches while stirring; (5) Adding polyether modified silicone oil, acid and alkali resistant antioxidant, and ultraviolet resistant agent into the product of step (4), and stirring at 100-150 rpm for 10-15 minutes; (6) Slowly adding isocyanate curing agent into the product of step (5), and stirring at low speed for 15-20 minutes, and then the product is obtained.

[0026] Preferably, the ceramic powder and carbon fiber in step (4) are vacuum dried respectively before reaction.

[0027] Further preferably, the ceramic powder and carbon fiber are vacuum dried respectively before reaction under the conditions independently selected from the group consisting of drying at 80-100℃, vacuum degree of-0.08~-0.09MPa for 2-3h.

[0028] Further preferably, the sewage pool body leakage repairing agent prepared by the above preparation method is stored in a cool, dry and ventilated place, and the temperature is controlled at 5-30℃.

[0029] The third aspect of the application relates to the construction process of the above-mentioned sewage pool body leakage repairing agent, comprising the following steps: S1: preliminary preparation According to the ground to be repaired, the target pool body with a buried depth of not more than 5m, the pool structure, capacity, and internal auxiliary facilities are surveyed, and a TPU or PVC flexible temporary water storage bag with corrosion resistance and anti-seepage performance is selected, and the capacity meets the pool capacity requirement; Step S2: temporary transfer At the top observation hole or bypass interface of the pool body, a temporary pumping and piping device is arranged to transfer the sewage in the pool body to the temporary water storage bag, and when the pool body is emptied, the water inlet and outlet are closed (the temporary water storage bag temporarily replaces the function of the repaired pool body, and ensures that the sewage treatment process is not interrupted); Step S3: pool cleaning The accumulated water and sediment in the pool body are emptied, and the pool wall and pool bottom surface are subjected to high-pressure flushing or sand blasting treatment to remove attached sludge and oil stains; Step S4: pool repairing The sewage pool body leakage repairing agent is pressed into the leakage part to ensure sufficient filling, and secondary coating is performed within 12 hours to form a double-layer structure, and after the leakage repairing agent is completely cured, sealing treatment is performed; Step S5: detection and resumption of use The adhesion, thickness and integrity of the anti-seepage layer are detected, and after the indicators meet the requirements, the sewage in the temporary water storage bag is returned to the pool body to resume the process flow.

[0030] Preferably, in step S2, the volume of the temporary water storage bag is 1.2-1.5 times the volume of the replaced water tank.

[0031] Preferably, in step S2, the material of the temporary water storage bag is preferably TPU or PVC.

[0032] Compared with the prior art, the present application has the following beneficial effects: 1) the present application significantly improves the performance of the patching material by optimizing the component ratio of the patching agent, which has the characteristics of rapid setting at low temperature, high strength and micro-expansion effect, effectively solving the problems of uncontrollable setting time and low strength of the patching material in the prior art under low temperature conditions; 2) the patching agent of the present application has good bonding strength and elasticity, can firmly block the cracks, and effectively prevent water damage, overcoming the limitations of traditional plugging methods such as direct plugging, pipe plugging and wedge plugging; 3) the patching agent of the present application has excellent high and low temperature resistance, can adapt to different construction environmental conditions, and solves the poor adaptability problem of the patching material in the prior art; 4) the patching agent of the present application has good compactness and long-term nature, effectively preventing voids and aging, and ensuring the durability and reliability of the patching effect; (5) when the sewage tank leaks, the process is not interrupted by using temporary water storage bag, temporary pumping and pipeline. DETAILED DESCRIPTION

[0033] It is worth noting that the raw materials used in the present application are ordinary commercially available products, and their sources are not specifically limited.

[0034] Example 1: A sewage tank body leakage patching agent for sewage treatment construction is made from the following raw materials by weight: 30 parts of SikaFix-108, 25 parts of YH-102, 6 parts of Desmodur 44V20L, 2 parts of DY-ET400R, 3 parts of 95 ceramic powder, 3 parts of Dongbang HTA-C600, 0.5 parts of KH-550, 5 parts of propylene glycol diglycidyl ether, 0.3 parts of antioxidant RD and 0.5 parts of UV-531.

[0035] Preparation method: (1) SikaFix-108 and YH-102 were added to a preheated stirring tank at 45℃, and stirred at 60rpm for 10min; (2) The preheated YH-102 was added to SikaFix-108, and stirred at 100rpm for 20min at a temperature of 45℃ to obtain a mixed resin system; (3) Slowly add propylene glycol diglycidyl ether to the mixed resin system, and stir at 100rpm for 20min; (4) Sprinkle KH-550 on 95 ceramic powder, Dongbang HTA-C600, and add the ceramic powder and carbon fiber treated with coupling agent into step (3) in 3 times, and stir at 120 rpm for 5 min and at 350 rpm for 10 min after each time; (5) Add DY-ET400R, antioxidant RD, and UV-531 into the product of step (4) in turn, and stir at 120 rpm for 10 min after each time; (6) Slowly add Desmodur 44V20L into the product of step (5), and stir at 80 rpm for 15 min, and the product is obtained.

[0036] Example 2: A sewage pool body leakage repairing agent for sewage treatment construction is prepared from the following raw materials in parts by weight: 40 parts of SikaFix-108, 23 parts of YH-102, 10 parts of Desmodur 44V20L, 3 parts of DY-ET400R, 6 parts of 95 ceramic powder, 1 part of Dongbang HTA-C600, 1 part of KH-550, 2 parts of propylene glycol diglycidyl ether, 0.5 part of antioxidant RD, and 0.3 part of UV-531.

[0037] The preparation method is the same as that in Example 1.

[0038] Example 3: A sewage pool body leakage repairing agent for sewage treatment construction is prepared from the following raw materials in parts by weight: 36 parts of SikaFix-108, 24 parts of YH-102, 7.5 parts of Desmodur 44V20L, 1.5 parts of DY-ET400R, 4 parts of 95 ceramic powder, 2 parts of Dongbang HTA-C600, 0.7 part of KH-550, 3.5 parts of propylene glycol diglycidyl ether, 0.4 part of antioxidant RD, and 0.4 part of UV-531.

[0039] The preparation method is the same as that in Example 1.

[0040] Comparative Example 1: A sewage pool body leakage repairing agent for sewage treatment construction is prepared from the following raw materials in parts by weight: 60 parts of YH-102, 6 parts of Desmodur 44V20L, 2 parts of DY-ET400R, 3 parts of 95 ceramic powder, 3 parts of Dongbang HTA-C600, 0.5 part of KH-550, 5 parts of propylene glycol diglycidyl ether, 0.3 part of antioxidant RD, and 0.5 part of UV-531.

[0041] The difference from Example 3 is that the polyurethane resin SikaFix-108 in Example 3 is replaced with an equal amount of epoxy resin YH-102.

[0042] The polyurethane resin SikaFix-108 is not involved in the preparation method.

[0043] Comparative Example 2 A sewage pool body leakage repairing agent for sewage treatment construction is prepared from the following raw materials in parts by weight: 60 parts of SikaFix-108, 6 parts of Desmodur 44V20L, 2 parts of DY-ET400R, 3 parts of 95 ceramic powder, 3 parts of Dongbang HTA-C600, 0.5 part of KH-550, 5 parts of propylene glycol diglycidyl ether, 0.3 part of antioxidant RD and 0.5 part of UV-531.

[0044] The difference from Example 3 is that the epoxy resin YH-102 in Example 3 is replaced with an equal amount of polyurethane resin SikaFix-108.

[0045] The epoxy resin YH-102 is not involved in the preparation method.

[0046] Comparative Example 3 A sewage pool body leakage repairing agent for sewage treatment construction is prepared from the following raw materials in parts by weight: 40 parts of SikaFix-108, 20 parts of YH-102, 7.5 parts of Desmodur 44V20L, 1.5 parts of DY-ET400R, 4 parts of 95 ceramic powder, 2 parts of Dongbang HTA-C600, 0.7 part of KH-550, 3.5 parts of propylene glycol diglycidyl ether, 0.4 part of antioxidant RD and 0.4 part of UV-531.

[0047] The difference from Example 3 is that the ratio of polyurethane resin SikaFix-108 to epoxy resin YH-102 is different, and the ratio of the two in Comparative Example 3 is 2, which exceeds the range of the mass ratio of polyurethane resin to epoxy resin being 1.2-1.8:1, while the ratio of the two in Example 3 is 1.5.

[0048] The preparation method is the same as that of Example 3.

[0049] Comparative Example 4 A sewage pool body leakage repairing agent for sewage treatment construction is prepared from the following raw materials in parts by weight: 30 parts of SikaFix-108, 30 parts of YH-102, 8 parts of Desmodur 44V20L, 1 part of DY-ET400R, 4 parts of 95 ceramic powder, 2 parts of Dongbang HTA-C600, 0.7 part of KH-550, 3.5 parts of propylene glycol diglycidyl ether, 0.4 part of antioxidant RD and 0.4 part of UV-531.

[0050] The difference from Example 3 is that the ratio of polyurethane resin SikaFix-108 to epoxy resin YH-102 is different, in Comparative Example 4, the ratio of the two is 1, which exceeds the range of the mass ratio of polyurethane resin to epoxy resin of 1.2-1.8:1, while in Example 3, the ratio of the two is 1.5.

[0051] The preparation method is the same as that of Example 3.

[0052] Comparative Example 5: A sewage pool body leakage repairing agent for sewage treatment construction is prepared from the following raw materials in parts by weight: 36 parts of SikaFix-108, 24 parts of YH-102, 8 parts of Desmodur 44V20L, 1 part of DY-ET400R, 4 parts of 95 ceramic powder, 2 parts of Dongbang HTA-C600, 0.7 part of KH-550, 3.5 parts of propylene glycol diglycidyl ether, 0.4 part of antioxidant RD and 0.4 part of UV-531.

[0053] The difference from Example 3 is that the mass ratio of isocyanate curing agent to polyether modified silicone oil is different, in Comparative Example 5, the ratio of Desmodur 44V20L to DY-ET400R is 8, which exceeds the range of the mass ratio of isocyanate curing agent to polyether modified silicone oil of 3-6:1; while in Example 3, the mass ratio of the two is 5.

[0054] The preparation method is the same as that of Example 3.

[0055] Comparative Example 6: A sewage pool body leakage repairing agent for sewage treatment construction is prepared from the following raw materials in parts by weight: 36 parts of SikaFix-108, 24 parts of YH-102, 6 parts of Desmodur 44V20L, 3 parts of DY-ET400R, 4 parts of 95 ceramic powder, 2 parts of Dongbang HTA-C600, 0.7 part of KH-550, 3.5 parts of propylene glycol diglycidyl ether, 0.4 part of antioxidant RD and 0.4 part of UV-531.

[0056] The difference from Example 3 is that the mass ratio of isocyanate curing agent to polyether modified silicone oil is different, in Comparative Example 6, the ratio of Desmodur 44V20L to DY-ET400R is 2, which exceeds the range of the mass ratio of isocyanate curing agent to polyether modified silicone oil of 3-6:1; while in Example 3, the mass ratio of the two is 5.

[0057] Experimental Example 1: Performance Parameters The sewage pool body leakage repairing agents obtained from Example 1-Example 3, Comparative Example 1-Comparative Example 6 are subjected to the following performance parameter determination: 1. Bond strength determination (with concrete): According to the "Construction structure reinforcement engineering construction quality acceptance specification" GB50550-2010 Appendix E. Prepare 100mmx100mmx100mm concrete test block, the surface is polished and cleaned. The patching agent is evenly brushed on the surface of the test block (coating thickness 2-3mm), after standard curing for 28d, the tensile shear test is carried out by using the universal testing machine, the loading speed is 1mm / min, the maximum load at the time of failure is recorded, and the bond strength is calculated.

[0058] 2. Anti-permeability performance determination Permeability coefficient: According to "Geosynthetic materials - Determination of permeability coefficient" GB / T 15789-2016, using variable head permeameter. Prepare Φ70mmx30mm patching agent test block, after curing for 28d, put it into the permeameter, apply water pressure, record the water permeation amount at different times, and calculate the permeability coefficient.

[0059] Anti-permeability pressure: According to the "Cement-based permeable crystalline waterproof material" GB 18445-2012 anti-permeability test method, using anti-permeability instrument, gradually increasing the pressure (0.2MPa per level, constant pressure for 30min), until the test block appears water seepage, record the pressure of the previous level as the anti-permeability pressure.

[0060] 3. Corrosion resistance determination Prepare 5% sulfuric acid solution, 5% sodium hydroxide solution, and 3.5% sodium chloride solution respectively.

[0061] Prepare standard mechanical property test block, after curing for 28d, immerse it in the above solution (liquid level is higher than the test block by 20mm), and stand still at room temperature for 30d.

[0062] Take out the test block, wipe off the surface moisture, measure its tensile strength, and calculate the ratio of the strength before and after immersion, which is the strength retention rate.

[0063] 4. Aging resistance determination Ultraviolet aging: According to "Plastics - Laboratory light fastness test method - Part 2: Xenon arc lamps" GB / T16422.2-2014, the test block is placed in a xenon arc lamp aging box, the temperature is controlled at 60℃, the relative humidity is 65%, the irradiation intensity is 550W / m², after cumulative irradiation of 1000h, the tensile strength retention rate is measured.

[0064] Thermal aging: Put the test block into a constant temperature oven, and keep it at 100℃ for 72h, then take it out and cool it to room temperature, and measure the tensile strength retention rate.

[0065] 5. Construction performance determination Surface / real dry time: according to the "Paint Film Drying Time Determination Method" GB / T 1728-1979 (2007), using the finger touch method.

[0066] In an environment of 25℃ and 60% relative humidity, the repair agent is brushed on the steel plate (thickness 2mm), and the surface is touched with fingers regularly. When there is no sticky feeling, it is considered as surface dry. When there is no trace after pressing, it is considered as real dry. The corresponding time is recorded.

[0067] Note: All test blocks should be prepared in an environment of 23℃±2℃ and 50%±5% relative humidity, and the curing conditions should meet the "Standard for Testing Methods of Mechanical Properties of Ordinary Concrete" GB / T 50081-2019. At least 3 groups of test blocks should be prepared for each performance test, and the average value of the test results is taken as the final data. The deviation should be controlled within ±5%. During the long-term performance test of corrosion resistance, aging, etc., the appearance of the test blocks should be observed regularly, and whether cracking, discoloration, swelling, etc. phenomena occur should be recorded.

[0068] The specific categories and standard values of the performance parameters are shown in Table 1.

[0069] Table 1: Specific categories and standard values of performance parameters

[0070] The specific test results of the sewage pool body leakage repair agent obtained in Examples 1-3 and Comparative Examples 1-6 are shown in Table 2.

[0071] Table 2: Performance parameter test results of sewage pool body leakage repair agent of the present application and comparative examples

[0072] According to the results in Table 2, the performance of Examples 1-3 is better than the standard value, which reflects the superiority of the comprehensive performance of the sewage pool body leakage repair agent under the optimal ratio. Comparative Example 1 lacks the flexibility and low-temperature rapid curing characteristics of polyurethane, resulting in a decrease in bonding strength, impermeability, aging resistance, workability and applicable temperature range; Comparative Example 2 has no epoxy resin, and the corrosion resistance is significantly deteriorated; Comparative Examples 3-6 have changed the ratio of polyurethane to epoxy resin, curing agent to silicone oil, resulting in a decrease in performance.

[0073] Application Example: A sewage treatment station in a chemical industry park (semi-underground concrete structure, buried depth 3.5m, effective volume 800m 3 ). Without interrupting the overall sewage treatment process of the park, the multiple leakage cracks (width 0.2-2mm) on the pool wall are quickly and reliably repaired.

[0074] Materials used: sewage pool body leakage repair agent: prepared by the formula and preparation method of embodiment 3 of the present application.

[0075] Temporary water storage facility: select PVC coating flexible water storage bag with excellent corrosion resistance and excellent anti-seepage performance, the specification is 1200m³, meet the pool capacity requirement and leave a margin.

[0076] Other auxiliary materials: high pressure cleaner, sand blasting equipment, temporary pumping pump (flow 100m 3 / h), supporting pipeline, crack detector, adhesion tester, thickness meter, etc.

[0077] Construction process steps: S1: preliminary preparation and evaluation First, the target adjusting pool is surveyed on site, the structure size, the approximate distribution of the leakage point, and the absence of complex obstacles inside are confirmed. According to the pool capacity (800m³) and the site space condition, a site is selected and leveled for placing a 2000m³ flexible temporary water storage bag. At the same time, a detailed construction plan, safety plan and sewage transfer scheme are formulated.

[0078] S2: temporary storage of sewage Install temporary pumping and pipeline at the observation hole on the top of the adjusting pool, and connect the other end to the water inlet of the expanded temporary water storage bag. Start the pumping pump to continuously transfer the sewage in the pool to the water storage bag. This process lasts about 6 hours. After the pool is basically emptied, immediately close the inlet and outlet valves of the adjusting pool to realize process isolation.

[0079] S3: complete cleaning and base surface treatment of the pool Empty the residual water and bottom sediments. The construction personnel enter the pool, first use a high pressure water gun (pressure ≥ 20MPa) to wash the pool wall and pool bottom comprehensively, remove the attached sludge and biofilm. For the area with heavy oil stains, use sand blasting treatment to expose the clean surface of the concrete base. After cleaning, use ventilation equipment to force ventilation to ensure that the air in the pool is circulating and the working environment is safe. Finally, use the crack detector to finely probe the pool body, accurately mark the position, length and width of all leakage cracks.

[0080] S4: leakage site repair construction According to the construction method provided by the present application: the marked cracks are treated by slotting (V-shaped slot) and blowing away the dust in the slot with compressed air. Take an appropriate amount of prepared sewage pool body leakage repair agent, use a special glue injection gun or a scraper, press and fill the repair agent into the crack slot, ensure that the material is in close contact with the base surface and is filled full without voids.

[0081] After waiting for about 8 hours according to the ambient temperature (about 15℃ during construction), the second coating is performed on the surface of the first coating, and the coating range is slightly wider than the first layer, so as to form a firm "double-layer composite impermeable structure".

[0082] After standing and curing, when the patching agent is completely cured (after about 24 hours), the surface of the repaired area is smoothed or sealed to be flush with the pool wall.

[0083] S5: Quality detection and system recovery After the patching agent is completely cured, quality detection is performed: Adhesion: The grid test is performed on the repaired area and the surrounding area using an adhesion tester, and the results are all greater than 1.5 MPa, meeting the requirements.

[0084] Thickness and integrity: The thickness of the impermeable layer is uniform, and no drumming or cracking is found through visual and knocking inspection, and the integrity is good.

[0085] After confirming that all indicators are qualified, the temporary pumping is started, and all the temporarily stored sewage in the temporary water storage bag is returned to the repaired regulating tank. The inlet and outlet valves of the regulating tank are opened, and the regulating tank is reconnected to the sewage treatment process. The entire construction period (from water stop to water supply recovery) is controlled within 72 hours, which maximizes the influence on the production system.

[0086] The above detailed description is a specific description of one of the feasible embodiments of the present application, and this embodiment is not used to limit the patent scope of the present application. Any equivalent implementation or change without departing from the present application should be included in the scope of the technical solutions of the present application.

Claims

1. A leak-sealing agent for sewage tanks used in sewage treatment construction, characterized in that, The sewage tank leakage repair agent is made from the following raw materials in parts by weight: 30-40 parts polyurethane resin, 20-30 parts epoxy resin, 5-10 parts isocyanate curing agent, 1-3 parts polyether modified silicone oil, 3-6 parts ceramic powder, 1-3 parts carbon fiber, 0.5-1 part silane coupling agent, 2-5 parts propylene glycol diglycidyl ether, 0.3-0.5 parts acid and alkali resistant antioxidant, and 0.3-0.5 parts UV resistant agent.

2. The sewage tank leakage repair agent according to claim 1, characterized in that, The polyurethane resin is selected from at least one of SikaFix-108 and XS-G119; the epoxy resin is selected from at least one of YH-102 and XT-108; the mass ratio of the polyurethane resin to the epoxy resin is 1.2-1.8:

1.

3. The sewage tank leakage repair agent according to claim 1, characterized in that, The isocyanate curing agent is a polymeric MDI curing agent, selected from at least one of Desmodur 44V20L and Desmodur E; the polyether modified silicone oil is a nonionic polyether modified silicone oil, selected from at least one of Dow Corning L-3600, DY-ET400R, DY-ET139, RH-NB-6505, SH-204A, SM-9102 and Silor SW88; the mass ratio of the isocyanate curing agent to the polyether modified silicone oil is 3-6:

1.

4. The sewage tank leakage repair agent according to claim 1, characterized in that, The ceramic powder is selected from at least one of 95 ceramic powder and zirconium oxide ceramic powder.

5. The sewage tank leakage repair agent according to claim 1, characterized in that, The carbon fiber is a short-cut carbon fiber, selected from at least one of Toho HTA-C600 and Mitsubishi Rayon T300.

6. The sewage tank leakage repair agent according to claim 1, characterized in that, The silane coupling agent is selected from at least one of KH-550 and KH-570.

7. The sewage tank leakage repair agent according to claim 1, characterized in that, The acid and alkali resistant antioxidant is selected from at least one of antioxidant RD and antioxidant 1010.

8. The sewage tank leakage repair agent according to claim 1, characterized in that, The UV protectant is selected from at least one of UV-531 and UV-327.

9. A method for preparing a sewage tank leakage repair agent according to any one of claims 1-8, comprising the following preparation steps: (1) Add polyurethane resin and epoxy resin to a mixing tank preheated to 40-50℃ and stir at 50-80 rpm for 10-15 min. (2) Add the preheated epoxy resin to the polyurethane resin, keep the temperature at 40-50℃, and stir at 80-100rpm for 20-25min to obtain a mixed resin system. (3) Add propylene glycol diglycidyl ether dropwise to the mixed resin system and stir at 80-100 rpm for 15-20 min; (4) Spray silane coupling agent onto the dried ceramic powder and carbon fiber, and add the ceramic powder and carbon fiber treated with coupling agent into step (3) in batches while stirring. (5) Add polyether modified silicone oil, acid and alkali resistant antioxidant and UV stabilizer to the product of step (4) and stir at 100-150 rpm for 10-15 minutes; (6) Slowly add isocyanate curing agent to the product of step (5) and stir at low speed for 15-20 minutes to obtain the product.

10. A construction process for a sewage tank leakage repair agent according to any one of claims 1-8 or a sewage tank leakage repair agent prepared by the preparation method according to claim 9, characterized in that, Includes the following steps: S1: Preliminary Preparations Based on the target pool that needs to be repaired, whether it is a surface, semi-underground, or underground pool with a depth not exceeding 5m, investigate the pool structure, capacity, and internal facilities, and select TPU or PVC flexible temporary water storage bags with corrosion resistance and seepage prevention properties, with a capacity that meets the pool's capacity requirements. Step S2: Temporary Dump Temporary drainage pumps and pipes are installed at the observation hole or bypass interface at the top of the pool to transfer the sewage in the pool to a temporary water storage bag. After the pool is emptied, the inlet and outlet are closed. Step S3: Pool cleaning Drain the water and sediment from the tank, and perform high-pressure washing or sandblasting on the tank walls and bottom to remove attached sludge and grease. Step S4: Repairing leaks in the pool Press the leak sealant into the leaking area of ​​the sewage tank to ensure full filling. Apply a second coat within 12 hours to form a double-layer structure. After the sealant has completely cured, perform a sealing treatment. Step S5: Detection and Resumption of Use After testing the adhesion, thickness, and integrity of the impermeable layer, and once the indicators meet the requirements, the wastewater in the temporary water storage bag is returned to the pool to restore the process flow.

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