Phosphorus tailing modified epoxy mortar surface protection material and preparation method thereof

Abstract

The invention discloses a phosphate tailing modified epoxy mortar surface protection material and a preparation method thereof, and relates to the technical field of constructional engineering materials.The phosphate tailing modified epoxy mortar surface protection material is prepared from a slurry component A and a solid component B, the slurry component A comprises the following components in parts by weight: 100 parts of epoxy resin, 30-40 parts of bisphenol A diglycidyl ether, 5-6 parts of a modifier, 20-60 parts of phosphate tailing powder and 10-25 parts of active carbon nanospheres; the solid component B is prepared from 10 to 15 parts of polyether amine, 10 to 15 parts of 2, 4, 6-tri (dimethylaminomethyl) phenol, 260 to 280 parts of natural sand, 60 to 80 parts of cement and 2 to 3 parts of modified silicon defoaming agent. The phosphate tailing modified epoxy mortar surface protection material has the advantages of excellent abrasion resistance, impact resistance, high medium resistance and the like, meanwhile, the price of epoxy mortar is reduced, a large amount of solid waste is consumed, and a new technical reference is provided for comprehensive utilization of the solid waste.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering materials, and in particular to a phosphorus tailings modified epoxy mortar surface protective material and a preparation method thereof. Background Art

[0002] Epoxy mortar is a widely used construction material, which is mainly composed of epoxy system, cement, sand, etc. Compared with pure epoxy resin materials, it has good volume stability, the volume remains basically unchanged before and after curing, and it has strong adhesion on the surface of most substrates. It can form a good interface layer with concrete, so that it can be fully used for concrete repair and surface protection. However, traditional epoxy mortar has problems such as uneven surface distribution, a simple epoxy layer on the top layer, and generally high prices during use, which affects its application effect in water conservancy and hydropower projects. At the same time, in order to solve the above problems, people began to study how to improve the protective properties of epoxy mortar on the concrete surface, and use other materials to modify its properties and reduce the price of epoxy mortar at the same time.

[0003] Phosphate tailings are solid waste generated during the phosphate ore mining process. Their main chemical components are calcium oxide, magnesium oxide, silicon dioxide and phosphorus pentoxide. If they are not utilized, they will not only cause environmental pollution, but also lead to the loss of valuable resources such as phosphorus, calcium, magnesium and silicon.

[0004] In view of the above situation, it is necessary to study and comprehensively utilize epoxy mortar and phosphate tailings to solve the above technical problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a phosphorus tailings modified epoxy mortar surface protective material and a preparation method thereof. The phosphorus tailings modified epoxy mortar surface protective material has the advantages of excellent abrasion resistance, impact resistance and high medium resistance, and at the same time realizes the recycling of phosphorus tailings powder solid waste, thereby reducing the cost of epoxy mortar construction materials.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a phosphorus tailings modified epoxy mortar surface protective material. The raw material components for preparing the phosphorus tailings modified epoxy mortar surface protective material include a slurry A component and a solid B component, calculated by weight:

[0008] The slurry component A comprises 100 parts of epoxy resin, 30-40 parts of bisphenol A diglycidyl ether, 5-6 parts of modifier, 20-60 parts of phosphorus tailings powder and 10-25 parts of active nano carbon spheres;

[0009] The solid B component comprises 10-15 parts of polyetheramine, 10-15 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 260-280 parts of natural sand, 60-80 parts of cement and 2-3 parts of modified silicon defoamer.

[0010] The phosphorus tailings in the above system are phosphate (chemical formula is PO4 3- ) reacts chemically with the hydroxyl groups (-OH) in epoxy resin to form acetate groups (CH3COO^-), thereby promoting the cross-linking reaction of epoxy resin and enhancing the mechanical properties of epoxy mortar. Calcium phosphate (chemical formula is Ca3(PO4)2) can react with calcium ions (Ca 2+ ) chemical reaction occurs to form nucleophilic crystals, filling microscopic defects and pores in the cement matrix and enhancing the density of cement paste. The modifier in this system contains a large number of polar groups such as -OH and -NH2, which form hydrogen bonds and van der Waals forces, so that the phosphorus tailings powder is well dispersed in the resin system, avoiding sedimentation during storage and curing, and avoiding the formation of a single pure epoxy resin layer on the surface.

[0011] The phosphorus tailings modified epoxy mortar surface protection material further promotes the combination of the epoxy system and the inorganic material by introducing phosphorus tailings into the epoxy mortar, enhancing its wear resistance, corrosion resistance and compactness, making it more durable and stable. In various complex environments, this addition can effectively protect the surface and extend the service life of the material, and has broad application prospects. The introduction of phosphorus tailings as an admixture into building materials can also achieve comprehensive resource utilization and reduce environmental pollution; therefore, building materials using phosphorus tailings as an admixture have potential economic and environmental benefits.

[0012] Furthermore, the reinforcing effect of active nanocarbon spheres in epoxy mortar can be described by the following chemical formula and physical model:

[0013] (1) Surface enhancement effect: The functional groups on the surface of the active nanocarbon spheres form chemical bonds with the epoxy resin matrix, which can be expressed in the form of chemical bonds:

[0014] O=C-OH+HO-R-NH2→O=C-NH-R-OH+H2O

[0015] (2) Mechanical enhancement effect: The spring model can be used to describe the effect of activated nanocarbon spheres in epoxy mortar. The elastic modulus and deformation of nanocarbon spheres can effectively prevent crack propagation and improve the overall abrasion resistance, impact resistance and strength of the material.

[0016] (3) Electrical effect: The electrical conductivity of activated carbon nanospheres is described by the Eugene-Zenitzky model. The electron transport properties and interfacial charge transfer of carbon nanospheres can improve the electrical conductivity of epoxy mortar, reduce static electricity accumulation and prevent corrosion.

[0017] Preferably, the epoxy resin is E44 epoxy resin or E51 epoxy resin.

[0018] Preferably, the modifier is an organic substance containing amino groups and hydroxyl groups in the molecule.

[0019] Preferably, the organic substance containing amino groups and hydroxyl groups in the molecule is one of dopamine, tyrosine or hydroxyethyldiamine.

[0020] Preferably, the phosphate tailings powder is solid waste generated in the process of phosphate ore mining and selection; the particle size of the phosphate tailings powder is 20 to 40 meshes.

[0021] Preferably, the structure of the activated nano-carbon spheres is one of C60, C70, NF10, N50 or NF100.

[0022] Preferably, the modified silicon defoamer is polydimethylsiloxane or polyether silicone oil.

[0023] In a second aspect, the present invention provides a method for preparing a phosphorus tailings modified epoxy mortar surface protective material, comprising the following steps:

[0024] (1) adding 30 to 40 parts of bisphenol A diglycidyl ether to 100 parts of epoxy resin and mixing them evenly, then adding a modifier, phosphorus tailings powder and activated nano carbon spheres and stirring evenly to obtain a slurry component A;

[0025] (2) adding polyetheramine and 2,4,6-tris(dimethylaminomethyl)phenol to natural sand, cement and modified silicon defoamer, stirring and mixing to obtain a solid B component;

[0026] (3) Pour the slurry component A into the solid component B and stir evenly to obtain the phosphorus tailings modified epoxy mortar surface protection material.

[0027] Preferably, the preparation method of the activated nano-carbon spheres is:

[0028] Add nano-carbon spheres to a strong acid solution and stir to react. After the reaction is completed, filter to remove the strong acid solution to obtain a filter residue. Wash the filter residue alternately with water and anhydrous ethanol until the pH of the filtrate is neutral. Dry the filter residue to obtain active nano-carbon spheres.

[0029] Preferably, the strong acid solution is a mixed solution of strong acids containing HNO3 and H2SO4, wherein the HNO 3、 The volume ratio of H2SO4 is 3-4:1; the stirring reaction is stirred for 3.5-4.5 hours; the drying temperature is 38-42°C, and the drying time is 8.5-9.5 hours.

[0030] The beneficial effects of the present invention are:

[0031] (1) The phosphorus tailing powder of the present invention, as a fine particle filler, can form a particle filling structure with uniform composition and close arrangement of particles in epoxy mortar, effectively fill the voids and pores in the mortar, and improve the compactness and impact resistance of the mortar. At the same time, the phosphorus tailing powder particles themselves have a high specific surface area, which can increase the surface area of ​​the mortar, effectively promote the bonding effect with the epoxy resin, and improve the bonding performance of the mortar.

[0032] (2) The high specific surface area and active surface functional groups of the active nano-carbon spheres provided by the present invention make them have excellent compatibility with the epoxy resin matrix, thereby effectively enhancing the interfacial bonding strength and improving the overall performance of the material. At the same time, the active nano-carbon spheres can be used as nano-fillers in the epoxy mortar system to form a three-dimensional network structure, effectively hinder crack propagation and deformation, and improve the strength, hardness and tensile resistance of the material. At the same time, the electrical enhancement effect can reduce electrostatic aggregation, improve the wear resistance and corrosion resistance of the material, and further enhance the surface protection ability of the concrete.

[0033] (3) The present invention aims at the problem of solid waste utilization and the like, and uses phosphorus tailing powder to modify epoxy mortar. The material has strong stability, good uniformity, high fluidity, strong workability and short curing time. Adding it to epoxy mortar as a filler can reduce the average linear thermal expansion coefficient of the overall material. This is because the low linear thermal expansion property of the filler can inhibit the overall thermal expansion behavior of the epoxy mortar. At the same time, the presence of phosphorus tailing powder greatly promotes the surface corrosion resistance and durability of the material. At the same time, phosphorus tailing powder, as a solid waste, will reduce the price of epoxy mortar materials after introduction, and realize the recycling of solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The surface morphology of the materials prepared in Examples 1 to 2 and Ratios 1 to 2 of the present invention;

[0035] Figure 2 The three-dimensional morphology diagram of the roughness of the materials prepared in Example 1 of the present invention and Comparative Example 1 is shown. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] The phosphate tailings powder used in the following examples and comparative examples is solid waste generated in the phosphate ore mining and selection process. The waste was analyzed and the analysis results are shown in Table 1.

[0039] Table 1

[0040]

[0041] As can be seen from Table 1, the main chemical composition of phosphate tailings is calcium oxide, magnesium oxide, silicon dioxide and phosphorus pentoxide, etc. Introducing it into building materials as an admixture can replace bulk admixtures on the one hand, and at the same time, it can utilize the high-content components in the phosphate tailings to improve the strength and durability of the materials. Introducing phosphate tailings into building materials as an admixture can also achieve comprehensive resource utilization and reduce environmental pollution. Therefore, building materials using phosphate tailings as admixtures have potential economic and environmental benefits.

[0042] Example 1

[0043] This embodiment provides a phosphorus tailings modified epoxy mortar surface protective material and a preparation method thereof. The raw material components for preparing the phosphorus tailings modified epoxy mortar surface protective material are:

[0044] 100 parts of E51 epoxy resin, 15 parts of polyetheramine, 30 parts of bisphenol A diglycidyl ether, 10 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 5 parts of dopamine hydrochloric acid solution modifier, 3 parts of polydimethylsiloxane modified silicon defoamer, 260 parts of natural sand with a particle size of less than 4.75 mm, 60 parts of ordinary Portland cement, 22 parts of active nano carbon spheres with a structure of C60, and 20 parts of 40-mesh phosphate tailings powder.

[0045] The preparation method comprises the following steps:

[0046] (1) C60 nanocarbon spheres were added to a mixed strong acid solution with a volume ratio of HNO3:H2SO=3:1, and stirred for 4 h using a magnetic stirrer; after stirring, all the strong acid was filtered using a Buchner funnel, and the filtrate was exchanged and washed with water and anhydrous ethanol until the pH of the filtrate reached neutral; after washing, the filtrate was dried in a vacuum drying oven at a drying temperature of 40°C for 8 h to obtain C60 active nanocarbon spheres.

[0047] (2) Add 30 parts of bisphenol A diglycidyl ether to 100 parts of epoxy resin and mix well, then add 5 parts of dopamine hydrochloric acid solution modifier, 20 parts of 40-mesh phosphate tailings powder and 2 parts of activated nanocarbon spheres with a structure of C60 and stir well for 3 minutes to obtain slurry component A.

[0048] (3) 15 parts of polyetheramine and 2,4,6-tris(dimethylaminomethyl)phenol were added to 260 parts of natural sand with a particle size of less than 4.75 mm, 60 parts of ordinary Portland cement, and 3 parts of polydimethylsiloxane-modified silicon defoamer, and mixed in a mixer for 3 minutes to obtain component B.

[0049] (4) Pour component A into the stirred component B and stir for 3 minutes to obtain a phosphorus tailings modified epoxy mortar surface protection material.

[0050] Example 2

[0051] The present embodiment provides a phosphorus tailings modified epoxy mortar surface protective material and a preparation method thereof. The raw material components for preparing the phosphorus tailings modified epoxy mortar surface protective material are:

[0052] 100 parts of E51 epoxy resin, 15 parts of polyetheramine, 35 parts of bisphenol A diglycidyl ether, 15 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 6 parts of hydroxyethyldiamine modifier solution, 2 parts of polydimethylsiloxane modified silicon defoamer, 270 parts of natural sand with a particle size of less than 4.75 mm, 65 parts of ordinary Portland cement, 25 parts of active nano-carbon spheres with a structure of C60, and 35 parts of 40-mesh phosphate tailings powder.

[0053] The preparation specifically comprises the following steps:

[0054] (1) C60 nanocarbon spheres were added to a mixed strong acid solution with a volume ratio of HNO3:H2SO=3:1, and stirred for 3.5 hours using a magnetic stirrer; after stirring, all the strong acid was filtered out using a Buchner funnel, and the filtrate was exchanged and washed with water and anhydrous ethanol until the pH of the filtrate reached neutral; after washing, the filtrate was dried in a vacuum drying oven at a drying temperature of 38°C for 8.5 hours to obtain C60 active nanocarbon spheres.

[0055] (2) 15 parts of bisphenol A diglycidyl ether were added to 100 parts of E51 epoxy resin and mixed evenly, and then 6 parts of hydroxyethyl diamine modifier solution, 35 parts of 40-mesh phosphate tailings powder and 25 parts of activated nano-carbon spheres with a structure of C60 were added and stirred evenly for 3 minutes to obtain slurry component A.

[0056] (3) 15 parts of polyetheramine and 25 parts of 2,4,6-tris(dimethylaminomethyl)phenol were added to 270 parts of natural sand with a particle size of less than 4.75 mm, 65 parts of ordinary Portland cement, and 2 parts of polydimethylsiloxane-modified silicon defoamer, and mixed in a mixer for 3 minutes to obtain component B.

[0057] (3) Pour component A into the stirred component B and stir for 3 minutes to obtain a phosphorus tailings modified epoxy mortar surface protection material.

[0058] Example 3

[0059] The present embodiment provides a phosphorus tailings modified epoxy mortar surface protective material and a preparation method thereof. The raw material components for preparing the phosphorus tailings modified epoxy mortar surface protective material are:

[0060] 100 parts of E51 epoxy resin, 15 parts of polyetheramine, 35 parts of bisphenol A diglycidyl ether, 15 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 5 parts of tyrosine modifier solution, 3 parts of polydimethylsiloxane modified silicon defoamer, 280 parts of natural sand with a particle size of less than 4.75 mm, 80 parts of ordinary Portland cement, 25 parts of C70 active nano-carbon spheres, and 60 parts of 40-mesh phosphate tailings powder.

[0061] The preparation method specifically comprises the following steps:

[0062] (1) Add C70 nanocarbon spheres to a mixed strong acid solution with a volume ratio of HNO3:H2SO=4:1, and stir with a magnetic stirrer for 3.5 hours; after stirring, use a Buchner funnel to filter all the strong acid, and use water and anhydrous ethanol to exchange and wash until the pH of the filtrate is neutral. After washing, use a vacuum drying oven to dry at a drying temperature of 42°C and a drying time of 9.5 hours; after drying, obtain C70 active nanocarbon spheres.

[0063] (2) 35 parts of bisphenol A diglycidyl ether were added to 100 parts of E51 epoxy resin and mixed evenly, and then 5 parts of tyrosine modifier solution, 60 parts of 40-mesh phosphate tailings powder and 25 parts of C60 active nanocarbon spheres were added and stirred evenly for 3 minutes to obtain slurry component A.

[0064] (3) 15 parts of polyetheramine and 2,4,6-tris(dimethylaminomethyl)phenol were added to 280 parts of natural sand with a particle size of less than 4.75 mm, 80 parts of ordinary Portland cement, and 3 parts of polydimethylsiloxane-modified silicon defoamer, and mixed in a mixer for 3 minutes to obtain component B.

[0065] (4) Pour component A into the stirred component B and stir for 3 minutes to obtain a phosphorus tailings modified epoxy mortar surface protection material.

[0066] The phosphate tailings modified epoxy mortar surface protective material prepared in Examples 1-3 is mainly used in special construction sites that appear in water conservancy and hydropower projects and are often used when subjected to erosion or chemical effects. Its function is to increase its construction performance and abrasion resistance, impact resistance and high medium resistance on the basis of ensuring high strength.

[0067] Comparative Example 1

[0068] The difference between this comparative example and Example 1 is that no phosphorus tailings powder is added.

[0069] Comparative Example 2

[0070] The difference between this comparative example and Example 1 is that no activated nano-carbon spheres or dopamine hydrochloric acid solution modifier is added.

[0071] Comparative Example 3

[0072] The difference between this comparative example and Example 1 is that the preparation method does not have step (1), and the inactive carbon spheres are directly added to step (2) of the preparation method.

[0073] The protective material consolidations of Examples 1 to 3 and Comparative Examples 1 to 3 were subjected to performance tests, and the specific test methods and test results are as follows: After components A and B were evenly mixed, they were cured at 23°C ± 2°C and 50% ± 5% RH. The test was carried out in accordance with the requirements of the "Technical Specification for Epoxy Resin Mortar" (DL / T 5193-2021). An electronic universal testing machine was used to test the compressive strength, tensile strength and bonding strength, impact and abrasion resistance and media resistance of the product; the impact resistance was determined according to the requirements of the "Determination of Impact Properties of Plastic Simply Supported Beams Part 2: Instrumented Impact Test" (GB / T 1043.2-2018); and the linear thermal expansion coefficient was determined using an adaptive dilatometer according to the "Determination of Linear Expansion Coefficient of Plastics at -30°C to 30°C" (GB / T 1036-2008).

[0074] All performance items were cured for 28 days, and the results are shown in Table 2.

[0075] Table 2: Material performance test table

[0076]

[0077] As can be seen from Table 2, the consolidation body obtained in Example 1 of the present invention has significantly better compressive strength, tensile strength, bonding strength, impact resistance, abrasion resistance and medium resistance than Comparative Examples 1 to 3, and the strength within the age period can also reach the compressive strength level of concrete used in construction above 40MPa, and the concrete will be well protected. At the same time, the impact resistance and abrasion resistance reach 2.9kJ / m 2 and 1436h / kg / m2 , and at the same time has high toughness; its performance change rate in the medium resistance test reaches 99.4%, enabling it to maintain good stability under chemical erosion. Figure 1 As shown, since comparative example 1 does not add phosphate tailings powder, it is unable to effectively fill the voids and pores in the mortar, thereby reducing the compactness and impact resistance of the epoxy mortar protective layer; secondly, comparative example 2 does not add activated nano-carbon balls and adhesives, and only partially fills the voids with phosphate tailings powder, resulting in a partial decline in its performance. Comparative example 3 does not activate the carbon balls, resulting in intermolecular repulsion when filling the gaps, and the interfacial bonding strength with the epoxy resin is limited, which is prone to interfacial peeling or cracking, affecting the overall performance of the material. In particular, after the introduction of phosphate tailings powder and activated nano-carbon balls, the linear thermal expansion coefficient of Examples 1 to 3 is greatly reduced compared with Comparative Examples 1 to 3, and is closer to the thermal expansion coefficient of concrete (5 to 12)×10 －6 ℃ -1 , change the properties of epoxy resin so that it matches the thermal expansion coefficient of the repaired concrete as much as possible to meet the requirements of engineering repair.

[0078] The materials prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were characterized by scanning electron microscopy. Figure 1 shown.

[0079] Depend on Figure 1 It can be seen that the surface of the epoxy mortar with added phosphate tailings powder and activated nano-carbon balls is denser and more uniform, and there are no nano-scale voids.

[0080] The roughness of the material surface will also affect the durability and service life of the surface protection material. On the one hand, rough surfaces are more likely to accumulate impurities such as dust and dirt. These impurities may cause corrosion, electrochemical corrosion and other problems in a humid environment, thereby reducing the durability of the material. On the other hand, when subjected to external forces such as water erosion and wind and sand erosion, the rough surface is more susceptible to wear and peeling, resulting in a shortened service life of the material. Smooth materials can reduce the attachment points of particle impact, reduce the formation and expansion of cracks, reduce the embedding of abrasive particles, and reduce the friction coefficient. The three-dimensional morphology of the roughness of the materials prepared in Example 1 and Comparative Example 1 is shown in the figure. Figure 2 shown.

[0081] By comparison Figure 2The roughness of the two materials in Example 1, the material obtained in Example 1 has a lower roughness, and in the system structure, the phosphorus tailings powder is present in the polymer network and in the gaps between sand and cement, and there is a crystal structure effect and an interface benefit in the microstructure of the epoxy mortar, and the crystal structure of the phosphorus tailings and the carbon oxide balls affects the crystal structure of the epoxy mortar at a microscopic level, thereby reducing the displacement freedom of the material when it is thermally expanded, and can reduce the linear thermal expansion coefficient of the entire material. At the same time, the phosphorus tailings and the carbon oxide balls interact with the interfaces of other components in the epoxy mortar, and an interface reaction occurs or a new structure is formed. These interface effects lead to changes in the stress distribution between the filler and the base material, which will affect the thermal expansion properties of the overall material.

[0082] Example 4

[0083] The present embodiment provides a phosphorus tailings modified epoxy mortar surface protective material and a preparation method thereof. The raw material components for preparing the phosphorus tailings modified epoxy mortar surface protective material are:

[0084] 100 parts of E44 epoxy resin, 10 parts of polyetheramine, 40 parts of bisphenol A diglycidyl ether, 13 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 6 parts of hydroxyethyldiamine modifier solution, 2 parts of polyether silicone oil modified silicon defoamer, 270 parts of natural sand with a particle size of less than 4.75 mm, 65 parts of ordinary Portland cement, 10 parts of active nano-carbon spheres with a structure of NF10, and 35 parts of 40-mesh phosphate tailings powder.

[0085] The preparation specifically comprises the following steps:

[0086] (1) NF10 nanocarbon spheres were added to a mixed strong acid solution with a volume ratio of HNO3:H2SO=4:1, and stirred for 4.5 h using a magnetic stirrer; after stirring, all the strong acid was filtered using a Buchner funnel, and the filtrate was exchanged and washed with water and anhydrous ethanol until the pH of the filtrate reached neutral; after washing, the filtrate was dried in a vacuum drying oven at a drying temperature of 40°C for 8 h to obtain NF10 active nanocarbon spheres.

[0087] (2) 40 parts of bisphenol A diglycidyl ether were added to 100 parts of E44 epoxy resin and mixed evenly, and then 6 parts of hydroxyethyl diamine modifier solution, 35 parts of 40-mesh phosphate tailings powder and 10 parts of active nano-carbon spheres with a structure of NF10 were added and stirred evenly for 3 minutes to obtain slurry component A.

[0088] (3) 10 parts of polyetheramine and 13 parts of 2,4,6-tris(dimethylaminomethyl)phenol were added to 270 parts of natural sand with a particle size of less than 4.75 mm, 65 parts of ordinary Portland cement, and 2 parts of polyether silicone oil modified silicon defoamer, and mixed in a mixer for 3 minutes to obtain component B.

[0089] (3) Pour component A into the stirred component B and stir for 3 minutes to obtain a phosphorus tailings modified epoxy mortar surface protection material.

[0090] In addition, the surface protection material of phosphorus tailings modified epoxy mortar can also be obtained by using N50 or NF100 active nano-carbon balls.

[0091] In summary, the present invention further promotes the combination of epoxy system and inorganic materials by introducing phosphate tailings into epoxy mortar, enhances its wear resistance, corrosion resistance and compacting performance, and makes it more durable and stable. Under various complex environments, this addition can effectively protect the surface, extend the service life of the material, and has a wide range of application prospects. Phosphorus tailings can be introduced into building materials as admixtures to achieve comprehensive resource utilization and reduce environmental pollution.

[0092] The specific implementation methods of the invention are described in detail above, but they are only examples, and the invention is not limited to the specific implementation methods described above. For those skilled in the art, any equivalent modification or substitution of the invention is also within the scope of the invention, therefore, the equalization, modification, improvement, etc. made without departing from the spirit and principle of the invention should be included in the scope of the invention.

Claims

1. A phosphorus tailings modified epoxy mortar surface protective material, characterized in that: The raw material components for preparing the phosphorus tailings modified epoxy mortar surface protection material include a slurry component A and a solid component B, calculated by weight: The slurry component A comprises 100 parts of epoxy resin, 30-40 parts of bisphenol A diglycidyl ether, 5-6 parts of modifier, 20-60 parts of phosphorus tailings powder and 10-25 parts of active nano carbon spheres; The solid B component comprises 10-15 parts of polyetheramine, 10-15 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 260-280 parts of natural sand, 60-80 parts of cement and 2-3 parts of modified silicon defoamer.

2. The phosphorus tailings modified epoxy mortar surface protective material according to claim 1, characterized in that: The epoxy resin is E44 epoxy resin or E51 epoxy resin.

3. The phosphorus tailings modified epoxy mortar surface protective material according to claim 1, characterized in that: The modifier is an organic substance containing amino groups and hydroxyl groups in the molecule.

4. The phosphorus tailings modified epoxy mortar surface protective material according to claim 3, characterized in that: The organic substance containing amino group and hydroxyl group in the molecule is one of dopamine, tyrosine or hydroxyethyldiamine.

5. The phosphorus tailings modified epoxy mortar surface protective material according to claim 1, characterized in that: The phosphate tailing powder is solid waste generated in the process of phosphate ore mining and selection; the particle size of the phosphate tailing powder is 20 to 40 meshes.

6. The phosphorus tailings modified epoxy mortar surface protective material according to claim 1, characterized in that: The structure of the active nano-carbon spheres is one of C60, C70, NF10, N50 or NF100.

7. The phosphorus tailings modified epoxy mortar surface protective material according to claim 1, characterized in that: The modified silicon defoamer is polydimethylsiloxane or polyether silicone oil.

8. A method for preparing the phosphorus tailings modified epoxy mortar surface protective material according to any one of claims 1 to 7, characterized in that: The steps include: (1) adding 30 to 40 parts of bisphenol A diglycidyl ether to 100 parts of epoxy resin and mixing them evenly, then adding a modifier, phosphorus tailings powder and activated nano carbon spheres and stirring evenly to obtain a slurry component A; (2) adding polyetheramine and 2,4,6-tris(dimethylaminomethyl)phenol to natural sand, cement and modified silicon defoamer, stirring and mixing to obtain a solid B component; (3) Pour the slurry component A into the solid component B and stir evenly to obtain the phosphorus tailings modified epoxy mortar surface protection material.

9. The method for preparing the surface protective material of phosphorus tailings modified epoxy mortar according to claim 8, characterized in that: The preparation method of the activated nano carbon spheres is: Add nano-carbon spheres to a strong acid solution and stir to react. After the reaction is completed, filter to remove the strong acid solution to obtain a filter residue. Wash the filter residue alternately with water and anhydrous ethanol until the pH of the filtrate is neutral. Dry the filter residue to obtain active nano-carbon spheres.

10. The method for preparing the surface protective material of phosphorus tailings modified epoxy mortar according to claim 9, characterized in that: The strong acid solution is a mixed solution of strong acids containing HNO3 and H2SO4. 3、 The volume ratio of H2SO4 is 3-4:1; the stirring reaction is stirred for 3.5-4.5 hours; the drying temperature is 38-42°C, and the drying time is 8.5-9.5 hours.

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