Anticorrosive mortar for pipeline maintenance and reinforcement and preparation method thereof

Abstract

The invention discloses anticorrosive mortar for pipeline maintenance and reinforcement and a preparation method thereof, and belongs to the technical field of energy-saving and environment-friendly building materials. The anticorrosive mortar is composed of a component A and a component B. The component A comprises cement, fine aggregate, an anticorrosive additive, a polymer emulsion and a filler, and the component B comprises asphalt, fly ash and triethanolamine. The anti-corrosion additive is prepared by mixing aluminum nitride, calcium oxalate and 2, 2, 2-trifluoroethyl methacrylate according to a specific ratio, so that the corrosion resistance of the mortar is remarkably improved. The polymer emulsion is a mixed solution of polyurethane emulsion and 2, 6-butylated hydroxytoluene, so that the bonding strength of the mortar is enhanced. The preparation method comprises the following steps: mixing and stirring the cement, the polymer emulsion and the water, and then adding the fine aggregate, the anticorrosive additive and the filler; meanwhile, heating and mixing asphalt, fly ash and triethanolamine; and finally, the two components are combined, heated and cooled to obtain the high-performance anti-corrosion mortar which has relatively good corrosion resistance and bonding strength.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy-saving and environmental protection building materials, and specifically relates to an anti-corrosion mortar for pipeline repair and reinforcement and a preparation method thereof. Background Art

[0002] In modern urban infrastructure, the maintenance and reinforcement of pipeline systems are particularly important. Over time, pipelines often suffer from varying degrees of damage and aging due to environmental factors, chemical corrosion, mechanical wear, etc. These problems not only affect the service life of the pipelines but may also lead to serious consequences such as leakage and blockage. Therefore, the development of high-performance anti-corrosion mortar for pipeline repair and reinforcement is one of the important research directions in the current building materials field.

[0003] Currently, there are already various anti-corrosion mortar products on the market, but most of them have the following deficiencies:

[0004] Insufficient corrosion resistance: Many traditional mortars are prone to degradation in acidic and alkaline environments, resulting in the failure of the protective layer.

[0005] Low bond strength: Existing products often lack sufficient bonding force when combined with the substrate, resulting in unsatisfactory repair effects.

[0006] High construction complexity: The preparation and construction processes of some anti-corrosion mortars are cumbersome and require special equipment or technical support, increasing the construction cost and time.

[0007] With the increasing emphasis on environmental protection and sustainable development, the construction industry's demand for new anti-corrosion materials is continuously increasing. Especially in industries such as sewage treatment and chemical engineering, higher requirements are put forward for the corrosion resistance, wear resistance, and construction convenience of materials. Although existing technologies have solved these problems to a certain extent, it is still necessary to further optimize the material formula to improve its comprehensive performance.

[0008] In summary, aiming at the deficiencies in the existing anti-corrosion mortar technology, the present invention aims to provide a new type of anti-corrosion mortar and its preparation method. By optimizing the material composition, its corrosion resistance, bond strength, and construction convenience are significantly improved to meet the needs of modern pipeline repair and reinforcement. This innovation will provide a more effective and economical solution for pipeline maintenance and promote the development of the building materials industry at the same time. Summary of the Invention

[0009] Problems to be Solved

[0010] The present invention aims to provide a new type of anti-corrosion mortar for pipeline repair and reinforcement and its preparation method to address the deficiencies of anti-corrosion mortar in the current market. This anti-corrosion mortar significantly improves its corrosion resistance, bond strength, and construction convenience by optimizing the material composition to meet the needs of modern pipeline repair.

[0011] Technical Solution

[0012] To solve the above problems, the present invention adopts the following technical solutions.

[0013] An anticorrosive mortar for pipeline repair and reinforcement, comprising a component A and a component B, wherein the mass ratio of the component A to the component B is (2-4):1;

[0014] Component A, in parts by weight, includes the following raw materials:

[0015] Cement: 120-160 parts,

[0016] Fine aggregate: 20-40 parts,

[0017] Preservatives: 10-20 parts,

[0018] Polymer emulsion: 40-60 parts,

[0019] Filler: 10-30 parts.

[0020] The antiseptic agent is composed of aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate in a mass ratio of 1:(2-5):(3-8);

[0021] The polymer emulsion is a mixture of polyurethane emulsion and 2,6-di-tert-butyl-p-cresol in a mass ratio of (10-20): (5-8);

[0022] The filler is zeolite powder with a particle size of 2000 mesh;

[0023] Component B, in parts by weight, includes the following raw materials:

[0024] Asphalt: 20-50 parts,

[0025] Fly ash: 10-25 parts,

[0026] Triethanolamine: 2 parts to 10 parts.

[0027] The anticorrosive mortar for pipeline repair and reinforcement comprises component A and component B, wherein the mass ratio between component A and component B is 3:1;

[0028] Component A, in parts by weight, includes the following raw materials:

[0029] Cement: 140 parts,

[0030] Fine aggregate: 30 parts,

[0031] Preservatives: 15 parts,

[0032] Polymer emulsion: 50 parts,

[0033] Filling: 20 parts.

[0034] The antiseptic agent is composed of aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate in a mass ratio of 1:4:5;

[0035] Aluminum nitride: CAS No. 24304-00-5, Calcium oxalate: CAS No. 563-72-4, 2,2,2-Trifluoroethylmethacrylate: CAS No. 352-87-4.

[0036] The polymer emulsion is a mixture of polyurethane emulsion and 2,6-di-tert-butyl-p-cresol in a mass ratio of 15:7; the CAS number of 2,6-di-tert-butyl-p-cresol is 128-37-0.

[0037] The filler is zeolite powder with a particle size of 2000 mesh; the CAS number of the zeolite powder is 1318-02-1.

[0038] Component B, in parts by weight, includes the following raw materials:

[0039] Asphalt: 40 parts,

[0040] Fly ash: 18 parts,

[0041] Triethanolamine: 6 parts.

[0042] Preferably, the preparation method of the antiseptic additive is as follows:

[0043] Aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate are mixed, and water twice the mass of 2,2,2-trifluoroethyl methacrylate is added, the mixing temperature is 55° C., the mixing time is 40 min, and a suspension is obtained;

[0044] The preparation method of the polymer emulsion is as follows:

[0045] Preheat the polyurethane emulsion to 67°C, then add 2,6-di-tert-butyl-p-cresol, stir quickly, add auxiliary reagents ethylene glycol and dibutyltin dilaurate, where the added mass of ethylene glycol is 0.1 times of the polyurethane emulsion, and the added mass of dibutyltin dilaurate is 0.1 times of the polyurethane emulsion, heat to 85°C, and cool. Ethylene glycol: CAS No. 107-21-1, dibutyltin dilaurate: CAS No. 77-58-7.

[0046] Preferably, the cement is PO 42.5 ordinary Portland cement;

[0047] The particle size of the fine aggregate is in the range of 1.25 mm to 1.75 mm, and the fine aggregate is obtained by crushing and screening rocks, pebbles, etc.

[0048] Preferably, the model of the polyurethane emulsion is PU-601. Its CAS number is 9009-54-5, and its physical and chemical performance parameters are as follows: appearance: milky white, slightly transparent, solid content: 60±2%, viscosity: ≤60s, pH value: 8.0±1, yellowing: level 4, elongation: about 1000%, resilience: 100%.

[0049] Preferably, the CAS number of the asphalt is 8052-42-4 and its density is 1.25 g / cm 3 .

[0050] Preferably, the diameter of the fly ash is in the range of 8um-20um, and its density is 2.9 g / cm 3 , with a specific surface area of ​​13500 cm 2 / g.

[0051] The method for preparing the anticorrosive mortar for pipeline repair and reinforcement comprises the following steps:

[0052] (1) Mix cement with polymer emulsion and water 0.4 times the mass of cement, stir in a stirring tank for 20-40 minutes, add fine aggregate, anticorrosive additive and filler after stirring, and vortex treatment to obtain mixed solution A; wherein the stirring speed is 40 rpm, and the vortex treatment parameters are: 300 rpm, 30 minutes;

[0053] (2) Mix asphalt, fly ash and triethanolamine, heat to 80°C-120°C and maintain for 1h-3h, then add water twice the amount of asphalt, stir thoroughly and cool to 55°C to obtain mixed solution B; wherein the stirring speed is 30rpm;

[0054] (3) Pour mixed solution B into mixed solution A, stir and heat continuously at a speed of 180 rpm. Let it stand after cooling and take out the precipitated viscous substance.

[0055] In the method for preparing the anti-corrosion mortar for pipeline repair and reinforcement, the heating temperature in step (3) is 85°C.

[0056] In addition, for anti-corrosion additives, aluminum nitride is a material with high thermal conductivity and good chemical stability. It can be used as a filler in mortar to increase the compactness of mortar, thereby improving the bonding strength with the substrate. Aluminum nitride itself has a certain corrosion resistance, which can prevent the erosion of mortar by corrosive media to a certain extent and enhance the durability of mortar. Calcium oxalate forms calcium ions in water, which can react with other components in cement to promote the hydration process of cement, thereby improving the strength and bonding of mortar. Calcium oxalate can react with corrosive media to form a relatively stable complex, thereby reducing the damage of corrosive media to mortar. 2,2,2-Trifluoroethyl methacrylate As an organic modifier, 2,2,2-trifluoroethyl methacrylate can improve the fluidity and adhesion of mortar and improve the bonding strength with the substrate; this component has excellent waterproof properties and can effectively prevent moisture penetration, thereby reducing material degradation and corrosion caused by moisture. The suspension formed by mixing aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate and adding an appropriate amount of water can significantly improve the bonding strength and corrosion resistance of the anti-corrosion mortar through complex chemical reactions and physical effects between the components. This process not only optimizes the material properties, but also provides an effective solution for pipeline maintenance and reinforcement.

[0057] In the process of preparing polymer emulsion, the mixing reaction of polyurethane emulsion and 2,6-di-tert-butyl-p-cresol involves the interaction of multiple components. Preheating the polyurethane emulsion to 67°C helps to reduce its viscosity and promote the uniform mixing of subsequent components. The increase in temperature can increase the molecular movement rate, thereby accelerating the reaction rate and improving the mixing effect. 2,6-di-tert-butyl-p-cresol is an effective antioxidant that can prevent polyurethane from oxidative degradation during subsequent processing and use, thereby extending the service life of the material; this component can also improve the toughness and bonding properties of polyurethane emulsion, so that the final product exhibits better bonding strength when combined with the substrate. As a low molecular weight polymer, ethylene glycol can improve the fluidity of the mixture and promote the interaction between components. In addition, ethylene glycol can also be used as a plasticizer to improve the flexibility of polyurethane. Dibutyltin dilaurate, a tin compound usually used as a catalyst, can accelerate the cross-linking reaction of polyurethane, thereby enhancing the mechanical strength and durability of the final product; it can promote the reaction between isocyanate and polyol and improve the stability of the polymer network structure. At 85°C, the components in the polyurethane emulsion will further react to form a more complex cross-linked structure. High temperature helps to increase the reaction rate, allowing more cross-linking points to form between polyurethane chains, thereby enhancing the overall performance of the material.

[0058] After cooling, the reaction stops and a stable polymer emulsion is formed. At this point, the material will maintain good physical properties and chemical stability, providing a reliable basis for subsequent applications. The polymer emulsion prepared by the above steps combines a variety of functional ingredients such as antioxidants, plasticizers and catalysts, which not only improves the bonding strength of the mortar, but also enhances its corrosion resistance and durability. Each link in this process plays an important role in the performance of the final product, thereby ensuring the effective application of anti-corrosion mortar in pipeline maintenance and reinforcement.

[0059] Beneficial Effects

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] By optimizing the composition of the anticorrosive additive, the stability of the mortar in an acidic and alkaline environment is enhanced, the service life of the pipeline is extended, and the maintenance frequency and cost are reduced. A mixture of polyurethane emulsion and 2,6-di-tert-butyl-p-cresol is used to improve the bonding force between the mortar and the substrate, ensure that the repair effect is more durable, and reduce shedding and peeling. The preparation method of the present invention has a clear process and simple steps, reduces the dependence on special equipment and technical support, shortens the construction time, and improves the construction efficiency. The materials used in the present invention meet the requirements of energy conservation and environmental protection, reduce the negative impact on the environment, conform to the concept of sustainable development, and provide a green solution for the building materials industry. By improving material properties and construction efficiency, the present invention can effectively reduce the overall cost of pipeline maintenance and reinforcement, and bring higher economic benefits to users. In summary, the present invention provides a high-performance mortar with significant anticorrosion effect and convenient construction, which has made a positive contribution to the development of the field of pipeline maintenance and reinforcement. DETAILED DESCRIPTION

[0062] The present invention is further described below in conjunction with specific embodiments.

[0063] Unless otherwise defined, technical and scientific terms used in the following examples have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. In practical applications, the weight ratios involved in the present invention can be set in kilograms.

[0064] Example 1

[0065] The anticorrosive mortar used for pipeline repair and reinforcement comprises component A and component B, wherein the mass ratio between component A and component B is 2:1;

[0066] Component A, in parts by weight, includes the following raw materials:

[0067] Cement: 120 parts,

[0068] Fine aggregate: 40 parts,

[0069] Preservatives: 10 parts,

[0070] Polymer emulsion: 60 parts,

[0071] Filling: 10 parts.

[0072] The antiseptic agent is composed of aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate in a mass ratio of 1:2:8;

[0073] The polymer emulsion is a mixture of polyurethane emulsion and 2,6-di-tert-butyl-p-cresol in a mass ratio of 10:8;

[0074] The filler is zeolite powder with a particle size of 2000 mesh;

[0075] Component B, in parts by weight, includes the following raw materials:

[0076] Asphalt: 20 parts,

[0077] Fly ash: 25 parts,

[0078] Triethanolamine: 2 parts.

[0079] The preparation method of the antiseptic additive is as follows:

[0080] Aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate are mixed, and water twice the mass of 2,2,2-trifluoroethyl methacrylate is added, the mixing temperature is 55° C., the mixing time is 40 min, and a suspension is obtained;

[0081] The preparation method of the polymer emulsion is as follows:

[0082] First preheat the polyurethane emulsion to 67°C, then add 2,6-di-tert-butyl-p-cresol, stir rapidly, add auxiliary reagents ethylene glycol and dibutyltin dilaurate, wherein the mass of ethylene glycol added is 0.1 times of the polyurethane emulsion, wherein the mass of dibutyltin dilaurate added is 0.1 times of the polyurethane emulsion, heat to 85°C, and cool.

[0083] The cement is PO 42.5 ordinary Portland cement;

[0084] The particle size of the fine aggregate is in the range of 1.25mm-1.75mm.

[0085] The model of the polyurethane emulsion is PU-601.

[0086] The CAS number of the asphalt is 8052-42-4 and its density is 1.25 g / cm 3 .

[0087] The diameter of the fly ash is in the range of 8um-20um, and its density is 2.9 g / cm3 , its specific surface area is 13500cm 2 / g.

[0088] The method for preparing the anticorrosive mortar for pipeline repair and reinforcement comprises the following steps:

[0089] (1) Mix cement with polymer emulsion and water 0.4 times the mass of cement, stir in a stirring tank for 20 min, add fine aggregate, anticorrosive additive and filler after stirring, and vortex treatment to obtain mixed solution A;

[0090] (2) Mix asphalt, fly ash and triethanolamine, heat to 80°C and maintain for 3 hours, then add twice as much water as the asphalt, stir thoroughly and cool to 55°C to obtain mixed solution B;

[0091] (3) Pour mixed solution B into mixed solution A, stir and heat continuously, let it stand after cooling, and take out the precipitated viscous substance.

[0092] In the method for preparing the anti-corrosion mortar for pipeline repair and reinforcement, the heating temperature in step (3) is 85°C.

[0093] Embodiment 2-7 is basically the same as embodiment 1, except that:

[0094] In Example 2, fine aggregate and filler are removed;

[0095] In Example 3, the preservative aid is removed;

[0096] In Example 4, aluminum nitride is removed;

[0097] In Example 5, 2,2,2-trifluoroethyl methacrylate is removed;

[0098] In Example 6, the polymer emulsion is a polyurethane emulsion;

[0099] In Example 7, the polymer emulsion was removed.

[0100] Example 8

[0101] The anticorrosive mortar used for pipeline repair and reinforcement comprises component A and component B, wherein the mass ratio between component A and component B is 4:1;

[0102] Component A, in parts by weight, includes the following raw materials:

[0103] Cement: 160 parts,

[0104] Fine aggregate: 20 parts,

[0105] Preservatives: 20 parts,

[0106] Polymer emulsion: 40 parts,

[0107] Filling: 30 parts.

[0108] The antiseptic agent is composed of aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate in a mass ratio of 1:5:3;

[0109] The polymer emulsion is a mixture of polyurethane emulsion and 2,6-di-tert-butyl-p-cresol in a mass ratio of 20:5;

[0110] The filler is zeolite powder with a particle size of 2000 mesh;

[0111] Component B, in parts by weight, includes the following raw materials:

[0112] Asphalt: 50 parts,

[0113] Fly ash: 10 parts,

[0114] Triethanolamine: 10 parts.

[0115] The preparation method of the antiseptic additive is as follows:

[0116] Aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate are mixed, and water twice the mass of 2,2,2-trifluoroethyl methacrylate is added, the mixing temperature is 55° C., the mixing time is 40 min, and a suspension is obtained;

[0117] The preparation method of the polymer emulsion is as follows:

[0118] First preheat the polyurethane emulsion to 67°C, then add 2,6-di-tert-butyl-p-cresol, stir rapidly, add auxiliary reagents ethylene glycol and dibutyltin dilaurate, wherein the mass of ethylene glycol added is 0.1 times of the polyurethane emulsion, wherein the mass of dibutyltin dilaurate added is 0.1 times of the polyurethane emulsion, heat to 85°C, and cool.

[0119] The cement is PO 42.5 ordinary Portland cement;

[0120] The particle size of the fine aggregate is in the range of 1.25mm-1.75mm.

[0121] The model of the polyurethane emulsion is PU-601.

[0122] The CAS number of the asphalt is 8052-42-4 and its density is 1.25 g / cm 3 .

[0123] The diameter of the fly ash is in the range of 8um-20um, and its density is 2.9 g / cm 3 , its specific surface area is 13500cm 2 / g.

[0124] The method for preparing the anticorrosive mortar for pipeline repair and reinforcement comprises the following steps:

[0125] (1) Mix cement with polymer emulsion and water 0.4 times the mass of cement, stir in a stirring tank for 40 min, add fine aggregate, anticorrosive additive and filler after stirring, and vortex treatment to obtain mixed solution A;

[0126] (2) Mix asphalt, fly ash and triethanolamine, heat to 120°C and maintain for 1 hour, then add twice as much water as the asphalt, stir thoroughly and cool to 55°C to obtain mixed solution B;

[0127] (3) Pour mixed solution B into mixed solution A, stir and heat continuously, let it stand after cooling, and take out the precipitated viscous substance.

[0128] In the method for preparing the anti-corrosion mortar for pipeline repair and reinforcement, the heating temperature in step (3) is 85°C.

[0129] Embodiments 9-10 are substantially the same as embodiment 8, except that:

[0130] In Example 9, asphalt is removed;

[0131] In Example 10, triethanolamine is removed.

[0132] Embodiment 11

[0133] The anticorrosive mortar used for pipeline repair and reinforcement comprises component A and component B, wherein the mass ratio between component A and component B is 3:1;

[0134] Component A, in parts by weight, includes the following raw materials:

[0135] Cement: 140 parts,

[0136] Fine aggregate: 30 parts,

[0137] Preservatives: 15 parts,

[0138] Polymer emulsion: 50 parts,

[0139] Filling: 20 parts.

[0140] The antiseptic agent is composed of aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate in a mass ratio of 1:4:5;

[0141] The polymer emulsion is a mixture of polyurethane emulsion and 2,6-di-tert-butyl-p-cresol in a mass ratio of 15:7;

[0142] The filler is zeolite powder with a particle size of 2000 mesh;

[0143] Component B, in parts by weight, includes the following raw materials:

[0144] Asphalt: 40 parts,

[0145] Fly ash: 18 parts,

[0146] Triethanolamine: 6 parts.

[0147] The preparation method of the antiseptic additive is as follows:

[0148] Aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate are mixed, and water twice the mass of 2,2,2-trifluoroethyl methacrylate is added, the mixing temperature is 55° C., the mixing time is 40 min, and a suspension is obtained;

[0149] The preparation method of the polymer emulsion is as follows:

[0150] First preheat the polyurethane emulsion to 67°C, then add 2,6-di-tert-butyl-p-cresol, stir rapidly, add auxiliary reagents ethylene glycol and dibutyltin dilaurate, wherein the mass of ethylene glycol added is 0.1 times of the polyurethane emulsion, wherein the mass of dibutyltin dilaurate added is 0.1 times of the polyurethane emulsion, heat to 85°C, and cool.

[0151] The cement is PO 42.5 ordinary Portland cement;

[0152] The particle size of the fine aggregate is in the range of 1.25mm-1.75mm.

[0153] The model of the polyurethane emulsion is PU-601.

[0154] The CAS number of the asphalt is 8052-42-4 and its density is 1.25 g / cm 3 .

[0155] The diameter of the fly ash is in the range of 8um-20um, and its density is 2.9 g / cm 3 , its specific surface area is 13500cm 2 / g.

[0156] The method for preparing the anticorrosive mortar for pipeline repair and reinforcement comprises the following steps:

[0157] (1) Mix cement with polymer emulsion and water 0.4 times the mass of cement, stir in a stirring tank for 30 min, add fine aggregate, anticorrosive additive and filler after stirring, and vortex treatment to obtain mixed solution A;

[0158] (2) Mix asphalt, fly ash and triethanolamine, heat to 100°C and maintain for 2 hours, then add twice as much water as the asphalt, stir thoroughly and cool to 55°C to obtain mixed solution B;

[0159] (3) Pour mixed solution B into mixed solution A, stir and heat continuously, let it stand after cooling, and take out the precipitated viscous substance.

[0160] In the method for preparing the anti-corrosion mortar for pipeline repair and reinforcement, the heating temperature in step (3) is 85°C.

[0161] Test Case

[0162] (1) Anti-corrosion performance test

[0163] The neutral salt spray resistance was measured with reference to GB / T 1771-2007 (1000h). The results are shown in Table 1.

[0164] Table 1 Anticorrosion performance results

[0165]

[0166] (2) Bond strength test

[0167] The preparation and testing of the bond strength test blocks were carried out in accordance with the mortar tensile bond strength test method in the "Standard for Test Methods for Basic Properties of Building Mortar" (JGJ / T70-2016), and the results are shown in Table 2.

[0168] Table 2 Bond strength results

[0169]

[0170] In the anti-corrosion performance test, Example 1 and Example 11 performed best, with no cracks and low rust, while the performance of other examples gradually decreased, especially Example 7, which performed the worst. In the bond strength test, the bond strengths of the various examples were relatively close, most of which were between 2.67 and 3.15 MPa, among which Example 1 and Example 11 had the highest bond strengths. These results show that anti-corrosion mortars with different formulations have significant differences in corrosion resistance and bond strength, providing a basis for subsequent material optimization.

[0171] In general, for anti-corrosion: Analysis of the removed components in Examples 2 to 10 shows that fine aggregates and fillers play a role in enhancing structural strength and filling voids in mortar. Removing these components will reduce the compactness of the mortar, thereby affecting its anti-corrosion performance and increasing the possibility of penetration of moisture and corrosive media, which may lead to faster material degradation and corrosion. Anti-corrosion additives are key components for improving the corrosion resistance of mortar. After removal, the mortar's resistance to acid-base environments and chemicals is significantly reduced, making the material more susceptible to chemical corrosion and reducing its service life in harsh environments. Aluminum nitride, as an effective anti-corrosion additive, can enhance the corrosion resistance of mortar. Removing aluminum nitride will directly affect the mortar's resistance to chemical media, which may lead to faster corrosion and deterioration, thereby affecting the long-term stability of the pipeline. Removal of 2,2,2-trifluoroethyl methacrylate, a component commonly used to improve the bonding strength and water resistance of mortar. After removal, the mortar may lose its resistance to moisture and other corrosive media, increasing the risk of material deterioration in a humid environment, thereby affecting its anti-corrosion effect. Polyurethane emulsion has excellent flexibility and adhesion, which helps to improve the bonding between mortar and substrate. Polymer emulsion is a key component to enhance the bonding strength and toughness of mortar. After removal, the mortar will lose important flexibility and adhesion, which will lead to problems such as brittle cracking and peeling, thereby reducing its anti-corrosion performance in harsh environments. Asphalt is often used to improve the water resistance and waterproofing of mortar. Removing asphalt will make the mortar more susceptible to water absorption, thereby increasing its deterioration rate in a humid environment and reducing the anti-corrosion effect. Triethanolamine, as an additive, can improve the fluidity and construction performance of mortar. After removal, it may make it difficult to evenly apply the mortar during construction, thereby affecting the integrity and uniformity of its protective layer, and then affecting the overall anti-corrosion effect. Each component plays an important role in the anti-corrosion mortar, and its removal or replacement will significantly affect the material's anti-corrosion performance, bonding strength and overall durability. Therefore, when designing and optimizing anti-corrosion mortar, it is necessary to comprehensively consider the impact of each component on the final performance to ensure its effectiveness and reliability in practical applications.

[0172] Regarding bonding: Analysis of the removed components in Examples 2 to 10 shows that fine aggregate and filler play a role in strengthening the structure and filling gaps in the mortar. Removing these components will reduce the compactness of the mortar, thereby affecting its bonding strength with the substrate. Lack of sufficient aggregate will make the mortar more prone to cracks during the drying process, further reducing the bonding effect. Anticorrosion additives generally have the function of improving the performance of mortar, including improving bonding strength. Removing anticorrosion additives may lead to a decrease in the overall performance of the mortar, especially when combined with the substrate, the problem of insufficient bonding strength may occur, increasing the risk of peeling and falling off. Aluminum nitride, as an anticorrosion additive, can enhance the bonding strength of the mortar to a certain extent. After removal, the mortar may lose part of its adhesion to the substrate, resulting in a decrease in bonding strength and affecting the repair effect. Removal of 2,2,2-trifluoroethyl methacrylate, a component that is generally used to improve the water resistance and bonding strength of the mortar. After removal, the mortar may exhibit lower bonding strength in a humid environment, thereby affecting its bonding effect with the substrate and increasing the risk of falling off. Polyurethane emulsions generally have good flexibility and bonding properties, but if they are not properly matched with other ingredients, the overall bonding effect may be affected. Polyurethane emulsions can improve the bonding between mortar and substrate, but their specific performance depends on other ingredients in the formula. Polymer emulsions are an important component for enhancing the bonding strength of mortar. After removal, the mortar will lose important flexibility and bonding, which will lead to problems such as brittle cracking and peeling, significantly reducing its bonding performance in harsh environments. Asphalt helps improve its waterproofness and bonding properties in mortar. Removing asphalt may cause the mortar to absorb water more easily, thereby reducing its bonding strength with the substrate and increasing the risk of material degradation and shedding. Triethanolamine, as an adjuvant, can improve the fluidity and construction performance of mortar. After removal, it may make it difficult to evenly apply the mortar during construction, thereby affecting its bonding strength with the substrate and the overall bonding effect. Each component plays an important role in anti-corrosion mortar, and its removal or replacement will significantly affect the bonding strength and overall performance of the material. Therefore, when designing and optimizing anti-corrosion mortar, it is necessary to comprehensively consider the impact of each component on the final performance to ensure its effectiveness and reliability in practical applications.

[0173] The above contents are further detailed descriptions of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the field of energy-saving and environmentally friendly building materials technology to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope determined by the claims submitted by the present invention.

Claims

1. An anticorrosive mortar for pipeline maintenance and reinforcement, characterized by: It includes component A and component B, wherein the mass ratio between component A and component B is (2-4):1; Component A, in parts by weight, includes the following raw materials: Cement: 120-160 parts, Fine aggregate: 20-40 parts, Preservatives: 10-20 parts, Polymer emulsion: 40-60 parts, Filler: 10-30 parts; The antiseptic agent is composed of aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate in a mass ratio of 1:(2-5):(3-8); The polymer emulsion is a mixture of polyurethane emulsion and 2,6-di-tert-butyl-p-cresol in a mass ratio of (10-20): (5-8); The filler is zeolite powder with a particle size of 2000 mesh; Component B, in parts by weight, includes the following raw materials: Asphalt: 20-50 parts, Fly ash: 10-25 parts, Triethanolamine: 2 parts to 10 parts.

2. The anticorrosive mortar for pipeline repair and reinforcement according to claim 1 is characterized in that: It includes component A and component B, wherein the mass ratio between component A and component B is 3:1; Component A, in parts by weight, includes the following raw materials: Cement: 140 parts, Fine aggregate: 30 parts, Preservatives: 15 parts, Polymer emulsion: 50 parts, Filling: 20 parts; The antiseptic agent is composed of aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate in a mass ratio of 1:4:5; The polymer emulsion is a mixture of polyurethane emulsion and 2,6-di-tert-butyl-p-cresol in a mass ratio of 15:7; The filler is zeolite powder with a particle size of 2000 mesh; Component B, in parts by weight, includes the following raw materials: Asphalt: 40 parts, Fly ash: 18 parts, Triethanolamine: 6 parts.

3. The anticorrosive mortar for pipeline repair and reinforcement according to claim 1 is characterized in that: The preparation method of the antiseptic additive is as follows: Aluminum nitride, calcium oxalate and 2,2,2-trifluoroethyl methacrylate are mixed, and water twice the mass of 2,2,2-trifluoroethyl methacrylate is added, the mixing temperature is 55° C., the mixing time is 40 min, and a suspension is obtained; The preparation method of the polymer emulsion is as follows: First preheat the polyurethane emulsion to 67°C, then add 2,6-di-tert-butyl-p-cresol, stir rapidly, add auxiliary reagents ethylene glycol and dibutyltin dilaurate, wherein the mass of ethylene glycol added is 0.1 times of the polyurethane emulsion, wherein the mass of dibutyltin dilaurate added is 0.1 times of the polyurethane emulsion, heat to 85°C, and cool.

4. The anticorrosive mortar for pipeline repair and reinforcement according to claim 1 is characterized in that: The cement is PO 42.5 ordinary Portland cement; The particle size of the fine aggregate is in the range of 1.25mm-1.75mm.

5. The anticorrosive mortar for pipeline repair and reinforcement according to claim 1 is characterized in that: The model of the polyurethane emulsion is PU-601.

6. The anticorrosive mortar for pipeline repair and reinforcement according to claim 1 is characterized by: The CAS number of the asphalt is 8052-42-4 and its density is 1.25 g / cm 3 .

7. The anticorrosive mortar for pipeline repair and reinforcement according to claim 1 is characterized by: The diameter of the fly ash is in the range of 8um-20um, and its density is 2.9 g / cm 3 , with a specific surface area of ​​13500 cm 2 / g.

8. The method for preparing the anticorrosive mortar for pipeline repair and reinforcement according to claim 1, comprising the following steps: (1) Mix cement with polymer emulsion and water 0.4 times the mass of cement, stir in a stirring tank for 20 min to 40 min, add fine aggregate, anticorrosive additive and filler after stirring, and vortex treatment to obtain mixed solution A; (2) Mix asphalt, fly ash and triethanolamine, heat to 80-120°C and maintain for 1-3 hours, then add twice as much water as the asphalt, stir thoroughly and cool to 55°C to obtain mixed solution B; (3) Pour mixed solution B into mixed solution A, stir and heat continuously, let it stand after cooling, and take out the precipitated viscous substance.

9. The method for preparing the anticorrosive mortar for pipeline repair and reinforcement according to claim 8, characterized in that: The heating temperature in step (3) is 85°C.

Images