Waterproof and acid-resistant mortar for repairing municipal pipelines

Abstract

The invention relates to the technical field of mortar, in particular to waterproof and acid-resistant mortar for municipal pipeline repair. 1000 parts by weight of the mortar comprise the following raw materials in parts by weight: 250-500 parts of a cementing material, 20-60 parts of an admixture, 1-5 parts of a water reducing agent, 30-100 parts of quartz powder, 10-40 parts of latex powder, 1-5 parts of a water repellent, 1-5 parts of fibers, 0.1-1 part of cellulose ether, 1-15 parts of a magnesium additive, 0.1-0.8 part of an early strength agent, 1-5 parts of a defoaming agent, 2-8 parts of a thixotropic lubricant, 0.5-3 parts of a retarder and the balance of aggregate. According to the invention, two cementing materials of a mixture of aluminate cement and sulfate-resistant portland cement are adopted, an admixture is doped, hydrophobic additives of a water reducing agent and latex powder are added, aggregate and the like are matched, and magnesium additives such as magnesium oxide and magnesium hydroxide are added, so that weak acid in sewage can be consumed through reaction, and calcium silicate crystals in the mortar are prevented from being corroded by the weak acid at the same time; acid etching resistance protection is formed; the device can be used for plane and vertical face maintenance in municipal sewage pipeline maintenance, and is good in construction state and excellent in performance.

Description

Technical Field

[0001] The invention relates to the technical field of mortar, and in particular to waterproof and acid-resistant mortar for repairing municipal pipelines. Background Art

[0002] Municipal sewage pipes generally have a pH value of 6.5-7.5. The slight decrease in pH may be due to anaerobic fermentation in the municipal sewage pipeline. Ordinary Portland cement has poor acid resistance and is easily corroded. Therefore, municipal sewage pipes made of ordinary Portland cement are often damaged and leaked due to corrosion during long-term use. Based on this, it is very important to develop a waterproof and acid-resistant mortar for municipal pipeline repair to increase the service life of municipal pipelines. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the object of the present invention is to provide waterproof and acid-resistant sand for municipal pipeline repair.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A waterproof and acid-resistant mortar for municipal pipeline repair, which comprises the following raw materials in parts by weight per 1000 parts by weight:

[0006] 250-500 parts of cementitious materials, 20-60 parts of admixtures, 1-5 parts of water reducing agents, 30-100 parts of quartz powder, 10-40 parts of latex powder, 1-5 parts of water repellents, 1-5 parts of fibers, 0.1-1 parts of cellulose ethers, 1-15 parts of magnesium additives, 0.1-0.8 parts of early strength agents, 1-5 parts of defoamers, 2-8 parts of thixotropic lubricants, 0.5-3 parts of retarder, and the balance is aggregate. Aggregates and other raw materials are balanced to 100% according to the total amount of raw materials, and the total amount of raw materials is calculated as 1kg, and 1 weight part is equivalent to 1g.

[0007] Preferably, a waterproof and acid-resistant mortar for municipal pipeline repair comprises the following raw materials in parts by weight per 1000 parts by weight:

[0008] 300-400 parts of cementitious materials, 30-50 parts of admixtures, 1-2 parts of water reducing agent, 40-80 parts of quartz powder, 10-30 parts of latex powder, 1-5 parts of water repellent, 2-4 parts of fiber, 0.1-0.5 parts of cellulose ether, 5-10 parts of magnesium additives, 0.2-0.5 parts of early strength agent, 1-2 parts of defoaming agent, 3-5 parts of thixotropic lubricant, 0.5-2 parts of retarder, and the rest is aggregate. Aggregates and other raw materials are balanced to 100% according to the total amount of raw materials; the total amount of raw materials is calculated as 1kg.

[0009] Specifically, the cementitious material is a mixture of any one of CA-60, CA-70, and CA-80 aluminate cement and sulfate-resistant silicate cement.

[0010] Specifically, the admixture is a mixture of granulated blast furnace slag powder, silicon powder and metakaolin in any proportion; the quartz powder is quartz powder of 200-400 meshes.

[0011] Specifically, the latex powder is any one of tert-butyl carbonate-ethyl acetate copolymer, acrylic acid, and styrene-butadiene latex powders, or a mixture of two or more of them in any proportion.

[0012] The cementitious material is a cementitious material treated with a coating treatment agent; the coating treatment agent is prepared by mixing the following raw materials in percentage by mass: 15%-25% acrylic resin, 8%-15% methacrylate, 5%-12% butyl stearate, 10%-20% butyl acrylate, 10%-15% acrylic acid, 1%-5% octylphenol polyoxyethylene ether, 10%-15% aluminate coupling agent, 8%-12% polyethylene wax, 1-5% ferric oxide, and 5-10% polyvinyl alcohol fiber; the amount of the coating treatment agent is 2-8wt% of the amount of the aggregate.

[0013] The coated cementitious material forms a dispersed and uniform structure, enhances the surface morphology of the cementitious material, improves the strength and density of the cementitious material, improves the pore structure of the mortar, and enhances the strength and impermeability of the mortar.

[0014] Specifically, the fiber is one of PP fiber, wood fiber, glass fiber, or a mixture of two or more in any proportion; the fiber is used to toughen, improve the density, crack resistance, flexibility, etc. of the material, and improve the durability of the special base surface.

[0015] Specifically, the cellulose ether is a low-viscosity cellulose ether; the cellulose ether is an auxiliary agent for increasing viscosity, maintaining plasticity, and preventing segregation and sedimentation.

[0016] Specifically, the aggregate is any one of iron and copper tailings sand of different grades, white corundum of different grades, calcined bauxite particles, and hollow alumina balls of different grades, or a mixture of two or more of them in any proportion.

[0017] Aggregates have excellent durability and corrosion resistance, and can be used for a long time in market pipe sewage without being corroded. At the same time, these aggregates are high-strength and high-density aggregates, which can significantly improve the strength and density of acid-resistant mortars, and can also prevent acid-resistant and anti-corrosion mortar layers from being easily infiltrated and corroded when they are in contact with municipal pipe sewage for a long time. The preferred aggregates are white corundum, calcined bauxite and hollow alumina balls of different grades.

[0018] Specifically, the water repellent is any one of zinc stearate, copper stearate, and magnesium stearate, or a mixture of two or more of them in any proportion.

[0019] The water reducer is a polycarboxylate water reducer or a naphthalene-based high-efficiency water reducer.

[0020] The early strength agent is a lithium salt early strength agent; the early strength agent can improve the early strength of the material after final setting, achieve the expected effect in a short period of time, reduce the construction period, and accelerate the construction.

[0021] The defoamer is a silicone defoamer or a polyether defoamer.

[0022] The thixotropic lubricant is one of magnesium aluminum silicate, lithium-based bentonite, and acid-modified bentonite, or a mixture of two or more of them in any proportion; the thixotropic lubricant can improve the slurry construction performance to a certain extent.

[0023] The retarder is one of sodium gluconate, sodium citrate, and tartaric acid, or a mixture of two or more of them in any proportion; the retarder is used to extend the operable time of the raw materials after adding water and mixing, delay the initial setting time, avoid too short an operable time after the raw materials are mixed, and reduce the impact on strength. Preferably, the retarder is sodium citrate + tartaric acid in a 1:1 ratio.

[0024] The magnesium additive is one of magnesium oxide, magnesium hydroxide, and magnesium fluorosilicate, or a mixture of two or more of them in any proportion.

[0025] Specifically, the early strength agent is one of lithium carbonate, lithium sulfate, lithium chloride, calcium formate, and sodium sulfate, or a mixture of two or more of them in any proportion.

[0026] Preferably, a waterproof and acid-resistant mortar for municipal pipeline repair further comprises 0.1-1 parts of starch ether; starch ether can improve construction performance.

[0027] A method for preparing a waterproof and acid-resistant mortar for municipal pipeline repair comprises the following steps: sequentially putting the above raw materials into a dry mortar mixer and mixing them evenly to obtain the waterproof and acid-resistant mortar for municipal pipeline repair.

[0028] The beneficial effects of the present invention are as follows: the waterproof and acid-resistant mortar for municipal pipeline repair of the present invention comprises the following raw materials in parts by weight based on 1000 parts by weight: 250-500 parts of cementitious material, 20-60 parts of admixture, 1-5 parts of water reducer, 30-100 parts of quartz powder, 10-40 parts of latex powder, 1-5 parts of water repellent, 1-5 parts of fiber, 0.1-1 parts of cellulose ether, 1-15 parts of magnesium additive, 0.1-0.8 parts of early strength agent, 1-5 parts of defoamer, 2-8 parts of thixotropic lubricant, 0.5-3 parts of retarder, and the balance is aggregate.

[0029] The waterproof and acid-resistant mortar for municipal pipeline repair adopts two cementing materials, a mixture of aluminate cement and sulfate-resistant silicate cement, mixed with admixtures, water-reducing agent, hydrophobic additives of latex powder, aggregate, etc., and magnesium additives such as magnesium oxide and magnesium hydroxide, which can react and consume weak acids in sewage, and prevent weak acids from corroding calcium silicate crystals in the mortar, forming acid-resistant protection. The present invention can be used for plane and facade repairs in municipal sewage pipeline repairs, with good construction status and excellent performance. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0031] Example 1

[0032] The waterproof and acid-resistant mortar for municipal pipeline repair of this embodiment includes the following raw materials in parts by weight based on 1000 parts by weight: 250 parts of cementitious material, 60 parts of admixture, 5 parts of water reducing agent, 30 parts of quartz powder, 40 parts of latex powder, 1 part of water repellent zinc stearate, 1 part of fiber, 0.5 parts of cellulose ether, 12 parts of magnesium additive, 0.1 parts of early strength agent, 2 parts of defoamer, 4 parts of thixotropic lubricant, 2 parts of retarder, and the balance is aggregate. Aggregate and other raw materials are balanced to 100% according to the total amount of raw materials, and the total amount of raw materials is calculated as 1kg, and 1 part by weight is equivalent to 1g.

[0033] The cementitious material is a mixture of 100 parts of CA-60 aluminate cement and 150 parts of sulfate-resistant silicate cement. The cementitious material is a cementitious material treated with a coating treatment agent; the coating treatment agent is prepared by mixing the following raw materials in percentage by mass: 15% acrylic resin, 8% methacrylate, 12% butyl stearate, 10% butyl acrylate, 15% acrylic acid, 15% aluminate coupling agent, 10% polyethylene wax, 5% octylphenol polyoxyethylene ether, 5% ferric oxide, and 5% polyvinyl alcohol fiber; the amount of the coating treatment agent is 3wt% of the amount of the cementitious material. The admixture is a mixture of 40 parts of granulated blast furnace slag powder and 20 parts of silicon powder. The magnesium additive is magnesium oxide. The aggregate is a mixture of copper tailings sand of different grades and bauxite in a ratio of 1:1, which is an acid-resistant aggregate. The latex powder is an acrylic latex powder. The water reducer is a naphthalene-based high-efficiency water reducer. The fiber is a mixture of 0.5 parts of PP fiber and 0.5 parts of wood fiber. The cellulose ether is a low-viscosity cellulose ether. The defoamer is an organic silicon defoamer. The early strength agent is lithium carbonate. The thixotropic lubricant is magnesium aluminum silicate. The retarder is a mixture of sodium citrate and tartaric acid in a ratio of 1:1.

[0034] A method for preparing a waterproof and acid-resistant mortar for municipal pipeline repair comprises the following steps: sequentially putting the above raw materials into a dry mortar mixer and mixing them evenly to obtain the waterproof and acid-resistant mortar for municipal pipeline repair.

[0035] The performance results are shown in the following table:

[0036]

[0037]

[0038] Example 2

[0039] The waterproof and acid-resistant mortar for municipal pipeline repair in this embodiment includes the following raw materials in parts by weight based on 1000 parts by weight: 300 parts of cementitious material, 50 parts of admixture, 2.5 parts of water reducing agent, 100 parts of quartz powder, 30 parts of latex powder, 1 part of copper stearate, 1 part of magnesium stearate, 2 parts of fiber, 0.8 parts of cellulose ether, 10 parts of magnesium additive, 0.3 parts of early strength agent, 3 parts of defoamer, 2 parts of thixotropic lubricant, 1 part of retarder, and the balance is aggregate. Aggregate and other raw materials are balanced to 100% according to the total amount of raw materials; the total amount of raw materials is calculated as 1kg, and 1 part by weight is equivalent to 1g.

[0040] The cementitious material is a mixture of 100 parts of CA-70 aluminate cement and 200 parts of sulfate-resistant silicate cement. The cementitious material is a cementitious material treated with a coating treatment agent; the coating treatment agent is prepared by mixing the following raw materials in percentage by mass: 18% acrylic resin, 10% methacrylate, 8% butyl stearate, 13% butyl acrylate, 15% acrylic acid, 12% aluminate coupling agent, 12% polyethylene wax, 2% octylphenol polyoxyethylene ether, 2% ferric oxide, and 8% polyvinyl alcohol fiber; the amount of the coating treatment agent is 2wt% of the cementitious material. The admixture is a mixture of 30 parts of silica powder and 20 parts of metakaolin. The magnesium additive is magnesium hydroxide. The aggregate is a mixture of white corundum of different grades and calcined bauxite particles in a ratio of 1:2, which is an acid-resistant aggregate. The latex powder is a styrene-butadiene latex powder. The water reducer is a polycarboxylic acid water reducer. The fiber is glass fiber. The cellulose ether is a low-viscosity cellulose ether. The defoamer is a polyether defoamer. The early strength agent is a mixture of lithium sulfate and lithium chloride in a ratio of 1:1. The thixotropic lubricant is lithium-based bentonite. The retarder is a mixture of sodium citrate and tartaric acid in a ratio of 1:1.

[0041] A method for preparing a waterproof and acid-resistant mortar for municipal pipeline repair comprises the following steps: sequentially putting the above raw materials into a dry mortar mixer and mixing them evenly to obtain the waterproof and acid-resistant mortar for municipal pipeline repair.

[0042] The performance results are shown in the following table:

[0043]

[0044]

[0045] Example 3

[0046] The waterproof and acid-resistant mortar for municipal pipeline repair in this embodiment includes the following raw materials in parts by weight based on 1000 parts by weight: 350 parts of cementitious materials, 30 parts of admixtures, 1.8 parts of water reducing agents, 75 parts of quartz powder, 25 parts of latex powder, 1 part of zinc stearate, 1 part of copper stearate, 1 part of magnesium stearate, 3 parts of fiber, 0.5 parts of cellulose ether, 8 parts of magnesium additives, 0.8 parts of early strength agents, 4 parts of defoamers, 6 parts of thixotropic lubricants, 0.5 parts of retarder, and the remainder is aggregate. Aggregates and other raw materials are balanced to 100% according to the total amount of raw materials; the total amount of raw materials is calculated as 1kg, and 1 part by weight is equivalent to 1g.

[0047] The cementitious material is a mixture of 150 parts of CA-80 aluminate cement and 200 parts of sulfate-resistant silicate cement. The cementitious material is a cementitious material treated with a coating treatment agent; the coating treatment agent is prepared by mixing the following raw materials in percentage by mass: 25% acrylic resin, 8% methacrylate, 10% butyl stearate, 13% butyl acrylate, 15% acrylic acid, 11% aluminate coupling agent, 9% polyethylene wax, 2% octylphenol polyoxyethylene ether, 1% ferric oxide, and 6% polyvinyl alcohol fiber; the amount of the coating treatment agent is 5wt% of the cementitious material. The admixture is a mixture of 15 parts of silica powder and 15 parts of metakaolin. The magnesium additive is a mixture of 5 parts of magnesium oxide and 3 parts of magnesium fluorosilicate. The aggregate is a mixture of calcined bauxite particles and hollow alumina balls of different grades in a ratio of 1:1, which is an acid-resistant aggregate. The latex powder is a latex powder of butyl carbonate-ethyl acetate copolymer. The water reducer is a polycarboxylate water reducer. The fiber is a mixture of 2 parts of PP fiber and 1 part of glass fiber. The cellulose ether is a low-viscosity cellulose ether. The defoamer is a polyether defoamer. The early strength agent is lithium chloride. The thixotropic lubricant is an acid-modified bentonite. The retarder is a mixture of sodium gluconate and sodium citrate in a ratio of 1:1.

[0048] A method for preparing a waterproof and acid-resistant mortar for municipal pipeline repair comprises the following steps: sequentially putting the above raw materials into a dry mortar mixer and mixing them evenly to obtain the waterproof and acid-resistant mortar for municipal pipeline repair.

[0049] The performance results are shown in the following table:

[0050]

[0051] Example 4

[0052] The waterproof and acid-resistant mortar for municipal pipeline repair in this embodiment includes the following raw materials in parts by weight based on 1000 parts by weight: 400 parts of cementitious material, 40 parts of admixture, 2 parts of water reducing agent, 50 parts of quartz powder, 20 parts of latex powder, 2 parts of zinc stearate, 5 parts of fiber, 0.2 parts of cellulose ether, 5 parts of magnesium additive, 0.6 parts of early strength agent, 1 part of defoamer, 8 parts of thixotropic lubricant, 3 parts of retarder, 0.5 parts of starch ether, and aggregate, and the balance is aggregate. Aggregate and other raw materials are balanced to 100% according to the total amount of raw materials; the total amount of raw materials is calculated as 1kg, and 1 part by weight is equivalent to 1g.

[0053] The cementitious material is a mixture of 300 parts of CA-70 aluminate cement and 100 parts of sulfate-resistant silicate cement. The cementitious material is a cementitious material treated with a coating treatment agent; the coating treatment agent is prepared by mixing the following raw materials in percentage by mass: 20% acrylic resin, 10% methacrylate, 7% butyl stearate, 15% butyl acrylate, 13% acrylic acid, 14% aluminate coupling agent, 10% polyethylene wax, 2% octylphenol polyoxyethylene ether, 3% ferric oxide, and 6% polyvinyl alcohol fiber; the amount of the coating treatment agent is 6wt% of the cementitious material. The admixture is a mixture of 20 parts of silicon powder and 20 parts of granulated blast furnace slag powder. The magnesium additive is a mixture of 2 parts of magnesium oxide, 2 parts of magnesium hydroxide, and 1 part of magnesium fluorosilicate. The aggregate is a mixture of different graded iron, different graded white corundum, and different graded hollow alumina balls in a ratio of 1:2:1, which is an acid corrosion-resistant aggregate. The latex powder is 10 parts of styrene-butadiene latex powder and 10 parts of tert-butyl carbonate-ethyl acetate copolymer latex powder. The water reducer is a polycarboxylic acid water reducer. The fiber is a mixture of 2 parts of PP fiber and 3 parts of wood fiber. The cellulose ether is a low-viscosity cellulose ether. The defoamer is an organic silicon defoamer. The early strength agent is a mixture of 0.4 parts of lithium chloride and 0.2 parts of sodium sulfate. The thixotropic lubricant is a mixture of 2 parts of magnesium aluminum silicate, 3 parts of lithium-based bentonite, and 3 parts of acid-modified bentonite. The retarder is tartaric acid.

[0054] A method for preparing a waterproof and acid-resistant mortar for municipal pipeline repair comprises the following steps: sequentially putting the above raw materials into a dry mortar mixer and mixing them evenly to obtain the waterproof and acid-resistant mortar for municipal pipeline repair.

[0055] The performance results are shown in the following table:

[0056]

[0057]

[0058] Example 5

[0059] The waterproof and acid-resistant mortar for municipal pipeline repair in the embodiment includes the following raw materials in parts by weight based on 1000 parts by weight: 500 parts of cementitious material, 30 parts of admixture, 3.5 parts of water reducing agent, 65 parts of quartz powder, 10 parts of latex powder, 2 parts of zinc stearate, 2 parts of magnesium stearate, 4 parts of fiber, 0.1 parts of cellulose ether, 15 parts of magnesium additive, 0.4 parts of early strength agent, 5 parts of defoamer, 5 parts of thixotropic lubricant, 1.5 parts of retarder, 1 part of starch ether, aggregate, and the balance is aggregate. Aggregate and other raw materials are balanced to 100% according to the total amount of raw materials; the total amount of raw materials is calculated as 1kg, and 1 part by weight is equivalent to 1g.

[0060] The cementitious material is a mixture of 200 parts of CA-70 aluminate cement, 200 parts of CA-80 aluminate cement and 100 parts of sulfate-resistant silicate cement. The cementitious material is a cementitious material treated with a coating treatment agent; the coating treatment agent is prepared by mixing the following raw materials in percentage by mass: 18% acrylic resin, 12% methacrylate, 8% butyl stearate, 18% butyl acrylate, 14% acrylic acid, 13% aluminate coupling agent, 10% polyethylene wax, 3% octylphenol polyoxyethylene ether, 5% ferric oxide, and 9% polyvinyl alcohol fiber; the amount of the coating treatment agent is 8wt% of the cementitious material. The admixture is a mixture of 10 parts of granulated blast furnace slag powder, 10 parts of silica powder, and 10 parts of metakaolin in any proportion. The magnesium additive is a mixture of 10 parts of magnesium oxide and 5 parts of magnesium fluorosilicate. The aggregate is a mixture of copper tailings sand of different grades, calcined bauxite particles, and hollow alumina balls of different grades in a ratio of 1:3:2, which is an acid corrosion resistant aggregate. The latex powder is 10 parts of acrylic rubber powder. The water reducer is a naphthalene-based high-efficiency water reducer. The fiber is wood fiber. The cellulose ether is a low-viscosity cellulose ether. The defoamer is a polyether defoamer. The early strength agent is a mixture of calcium formate and lithium carbonate in a ratio of 1:1. The thixotropic lubricant is a mixture of 2 parts of magnesium aluminum silicate, 1 part of lithium-based bentonite, and 2 parts of acid-modified bentonite. The retarder is a mixture of sodium gluconate and tartaric acid in a ratio of 1:1.

[0061] A method for preparing a waterproof and acid-resistant mortar for municipal pipeline repair comprises the following steps: sequentially putting the above raw materials into a dry mortar mixer and mixing them evenly to obtain the waterproof and acid-resistant mortar for municipal pipeline repair.

[0062] The performance results are shown in the following table:

[0063]

[0064] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. Waterproof and acid-resistant mortar for municipal pipeline repair, characterized by: Based on 1000 parts by weight, it includes the following raw materials in parts by weight: 250-500 parts of cementitious materials, 20-60 parts of admixtures, 1-5 parts of water reducing agent, 30-100 parts of quartz powder, 10-40 parts of latex powder, 1-5 parts of water repellent, 1-5 parts of fiber, 0.1-1 parts of cellulose ether, 1-15 parts of magnesium additive, 0.1-0.8 parts of early strength agent, 1-5 parts of defoaming agent, 2-8 parts of thixotropic lubricant, 0.5-3 parts of retarder, and the balance is aggregate.

2. The waterproof and acid-resistant mortar for municipal pipeline repair according to claim 1 is characterized in that: Based on 1000 parts by weight, it includes the following raw materials in parts by weight: 300-400 parts of cementitious materials, 30-50 parts of admixtures, 1-2 parts of water reducing agent, 40-80 parts of quartz powder, 10-30 parts of latex powder, 1-5 parts of water repellent, 2-4 parts of fiber, 0.1-0.5 parts of cellulose ether, 5-10 parts of magnesium additive, 0.2-0.5 parts of accelerator, 1-2 parts of defoaming agent, 3-5 parts of thixotropic lubricant, 0.5-2 parts of retarder, and the balance is aggregate.

3. The waterproof and acid-resistant mortar for municipal pipeline repair according to claim 1 or 2, characterized in that: The cementitious material is a mixture of any one of CA-60, CA-70, and CA-80 aluminate cement and sulfate-resistant silicate cement; The admixture is a mixture of granulated blast furnace slag powder, silica powder and metakaolin in any proportion; the quartz powder is quartz powder of 200-400 mesh; The latex powder is any one of tert-butyl carbonate-ethyl acetate copolymer, acrylic acid, and styrene-butadiene latex powders, or a mixture of two or more of them in any proportion; The fiber is one of PP fiber, wood fiber, glass fiber, or a mixture of two or more in any proportion; The cellulose ether is a low-viscosity cellulose ether.

4. The waterproof and acid-resistant mortar for municipal pipeline repair according to claim 1 or 2, characterized in that: The water repellent is any one of zinc stearate, copper stearate, and magnesium stearate, or a mixture of two or more of them in any proportion; The water reducer is a polycarboxylate water reducer or a naphthalene-based high-efficiency water reducer. The early strength agent is a lithium salt early strength agent; The defoamer is a silicone defoamer or a polyether defoamer; The thixotropic lubricant is one of magnesium aluminum silicate, lithium bentonite, acid-modified bentonite, or a mixture of two or more of them in any proportion; The retarder is one of sodium gluconate, sodium citrate, and tartaric acid, or a mixture of two or more of them in any proportion; The magnesium additive is one of magnesium oxide, magnesium hydroxide, and magnesium fluorosilicate, or a mixture of two or more of them in any proportion.

5. The waterproof and acid-resistant mortar for municipal pipeline repair according to claim 1 or 2, characterized in that: The aggregate is any one of iron and copper tailings sand of different grades, white corundum of different grades, calcined bauxite particles, and hollow alumina balls of different grades, or a mixture of two or more of them in any proportion.

6. The waterproof and acid-resistant mortar for municipal pipeline repair according to claim 5 is characterized by: The gelling material is a gelling material treated with a coating treatment agent; the coating treatment agent is prepared by mixing the following raw materials in percentage by mass: 15%-25% acrylic resin, 8%-15% methacrylate, 5%-12% butyl stearate, 10%-20% butyl acrylate, 10%-15% acrylic acid, 10%-15% aluminate coupling agent, 8%-12% polyethylene wax, 1%-5% octylphenol polyoxyethylene ether, 1-5% ferric oxide, and 5-10% polyvinyl alcohol fiber.

7. The waterproof and acid-resistant mortar for municipal pipeline repair according to claim 6, characterized in that: The amount of the coating treatment agent is 2-8 wt % of the amount of the gelling material.

8. The waterproof and acid-resistant mortar for municipal pipeline repair according to claim 4 is characterized in that: The early strength agent is one of lithium carbonate, lithium sulfate, lithium chloride, calcium formate and sodium sulfate, or a mixture of two or more of them in any proportion.

9. The waterproof and acid-resistant mortar for municipal pipeline repair according to claim 1 or 2, characterized in that: Based on 1000 parts by weight, it also includes 0.1-1 part of starch ether.

10. The method for preparing the waterproof and acid-resistant mortar for municipal pipeline repair according to any one of claims 1 to 9, characterized in that: The above raw materials are sequentially put into a dry mortar mixer and mixed evenly to obtain waterproof and acid-resistant mortar for municipal pipeline repair.

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