Alkali-activated solid waste anti-corrosion and repairing material and preparation method thereof
By optimizing the composition and preparation method of alkali-activated solid waste anti-corrosion and repair materials, the corrosion problem of marine reinforced concrete and steel structures in harsh environments has been solved, achieving efficient and environmentally friendly anti-corrosion effects and extending the service life of structures.
Patent Information
- Application Number
- CN202511537962.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2025-08-19
- Filing Date
- 2025-10-27
- Publication Date
- 2026-01-20
AI Technical Summary
Existing marine reinforced concrete and steel structures lack adequate corrosion protection measures in harsh environments, and traditional anti-corrosion materials are harmful to the environment and cannot effectively extend their service life.
Alkali-activated solid waste corrosion prevention and repair materials are used. By optimizing the proportion of raw materials such as slag powder, fly ash, metakaolin, and red mud, and combining them with modified microporous molecular sieves, composite reinforcing hydrophobic agents and viscosity modifiers, an organic-inorganic hybrid cross-linked structure is formed to enhance corrosion resistance.
It improves the corrosion resistance and durability of marine engineering structures, reduces environmental impact, and is non-toxic, harmless, and easy to operate. It also significantly enhances the early and late strength development and durability of the material.
Smart Images
Figure BDA0005654781460000111 
Figure BDA0005654781460000121
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of corrosion protection and repair, more particularly, it relates to a kind of alkali-activated solid waste corrosion protection and repair material and preparation method. BACKGROUND
[0002] Due to the long-term harsh and complex environment of marine reinforced concrete and steel structure, in order to prolong its service life, in addition to the optimization of its durability, coating a corrosion-resistant and durable coating on the surface of the component is the simplest and most efficient protective measure, which forms a protective film after hardening, effectively isolates the contact between the surface of the structure and the corrosive factors such as seawater, delays the occurrence of corrosion, and prolongs the service life of marine structures.
[0003] The alkali-activated solid waste corrosion protection and repair material makes full use of industrial waste slag resources, reduces the consumption of natural resources and the impact on the environment, greatly reduces carbon emissions, and meets the principles of sustainable development. At the same time, compared with other organic and inorganic corrosion protection materials, the microstructure of the alkali-activated solid waste corrosion protection and repair material is more delicate, and the mechanical properties and durability are more excellent. Its early and late strength development, durability and other properties are particularly outstanding, and it is non-toxic, harmless, has no volatile gas, and can be operated at room temperature, which is convenient to implement. SUMMARY
[0004] The purpose of the present application is to provide a kind of alkali-activated solid waste corrosion protection and repair material and preparation method, in order to effectively improve the corrosion resistance of marine structures and improve their durability.
[0005] To achieve the above purpose, the present application adopts the following technical solutions:
[0006] In the first aspect, the alkali-activated solid waste corrosion protection and repair material and preparation method provided by the present application adopts the following technical solutions: the following raw materials are included by weight: water 15-25 parts, slag powder 35-45 parts, fly ash 5-8 parts, metakaolin 5-8 parts, red mud 3-5 parts, composite activator 3-5 parts, composite reinforcing hydrophobic agent 0.2-0.8 parts, viscosity modifier 3-5 parts, polyvinyl alcohol fiber (length 3mm) 0.2-0.8 parts, styrene-acrylic emulsion 0.8-1.5 parts, powder defoamer 0.1-0.7 parts, sand (<0.3mm) 20-30 parts, and appropriate amount of ethanol solution, composite activator includes water glass, sodium hydroxide and microporous molecular sieve; composite reinforcing hydrophobic agent includes silane coupling agent and polydimethylsiloxane; viscosity modifier includes talc, sodium metasilicate and alcohol ether; the specific surface area of slag powder, fly ash and metakaolin is 410m 2 / kg, 380m 2 / kg and 420m 2 / kg, the comprehensive activity index is greater than 85% according to the proportion, the calcium oxide content of red mud is 36%, the silicon oxide content is 32%, and the aluminum oxide content is 12%.
[0007] By adopting the technical scheme, the mix proportion of the alkali-activated solid waste anticorrosion and repairing material is optimized, the precursor (mineral powder, fly ash and metakaolin) and the activator (red mud and composite activator) are used to form the main alkali-activated cementing phase, the composite reinforcing hydrophobic agent is used to strengthen the hybrid of the styrene-acrylic emulsion and the main alkali-activated cementing phase, the strong combination of the organic and inorganic phases is realized, the viscosity regulator is used to promote the suspension and homogenization of the mixture particles, the movement resistance of the particles is reduced, and the viscosity is adjusted, the iron tailing sand with a particle size of 0.3 mm is used as the aggregate to hinder shrinkage, and the length of 3 mm polyvinyl alcohol fiber is further used to prevent cracking.
[0008] The modified microporous molecular sieve has excellent adsorption performance for polarity analysis, the alkali activator can be effectively adsorbed in the pore channel and on the surface of the modified microporous molecular sieve, the powder composite activator with good dispersity is realized, and the alkali activation effect is promoted in the mixing process, in the alkali activation reaction process, the alkalinity of the system is gradually increased, the hydroxyl ions around the modified microporous molecular sieve are more and more, the adsorbed two-component activator ions in the modified microporous molecular sieve are gradually released, continuously participate in the reaction, and the cementing body is formed, at the same time, the styrene-acrylic emulsion is broken in the alkaline environment, the hybrid crosslinking of the organic and inorganic molecules is realized, the composite reinforcing hydrophobic agent is continuously dissolved in the alkaline environment, and the silane coupling agent and polydimethylsiloxane are released, the organic-inorganic bridge is further established, the hybrid crosslinking of the organic and inorganic molecules is further strengthened, the hydrophobicity of the mixture is realized by relying on the polydimethylsiloxane, the viscosity regulator can adjust the viscosity of the system when the two-component activator ions in the modified microporous molecular sieve have not been released, the stratification is prevented, in the later period, the viscosity regulator reacts with the calcium phase and the silicon-aluminum phase to generate a substance with certain cementing effect, the internal structure after hardening of the mixture is improved, the mixture is more compact, and the addition of the sand and the polyvinyl alcohol fiber reduces the shrinkage and cracking, thereby improving the overall performance of the alkali-activated solid waste anticorrosion and repairing material.
[0009] The highly dispersed powder two-component activator (water glass and NaOH), the powder composite reinforcing hydrophobic agent and the powder viscosity regulator are used to realize the premixing with the precursor and solid materials such as sand and polyvinyl alcohol fiber, and convenience is provided for implementation.
[0010] Preferably, the composite activator is prepared through the following steps:
[0011] Step 1, the water glass and the 10 mol / L NaOH solution are used for compounding, the original modulus of the water glass is 3.2, the modulus of the water glass is adjusted to 2 by using the NaOH particles, the alkali activator is aged for more than 24 h at room temperature after being fully stirred, and is ready for use;
[0012] Step 2, the microporous molecular sieve is subjected to sufficient ball milling, and the ethanol solution is added while stirring and heating until a slurry with a solid content of 65-75% is formed, and then microwave modification is performed to obtain a dry modified microporous molecular sieve, which is then fully mixed, stirred and dried with an alkali activator to form a composite activator.
[0013] By adopting the above technical solution, the microporous molecular sieve is subjected to ball milling to facilitate improvement of the surface performance of the microporous molecular sieve and improvement of its adsorption of ions, and the ethanol solution is stirred and heated to facilitate promotion of the hydrophilic performance of the microporous molecular sieve, which can be better combined with hydrophilic substances such as alkali liquor, and the microporous molecular sieve after microwave modification has excellent adhesion and can effectively load the alkali activator.
[0014] Preferably, in step 2, the microwave modification conditions are that the microwave is an electromagnetic wave of 50-100 GHz, the air relative humidity is 50-70%, and the temperature is 40-55℃.
[0015] By adopting the above technical solution, the conditions for microwave modification are further optimized to enable the pore structure inside the microporous molecular sieve to have good adsorption and effectively load the alkali activator and have certain surface activity.
[0016] Preferably, the mass ratio of the microporous molecular sieve to the alkali activator is (1.9-2.6):(1.2-2.2).
[0017] Preferably, the composite enhanced hydrophobic agent is prepared by the following steps:
[0018] Step 1, the silane coupling agent and the polydimethylsiloxane are atomized in an atomization chamber, and the fly ash is blown in by using a wind speed machine to make the fly ash particles uniformly adhere to the silane coupling agent and the polydimethylsiloxane;
[0019] Step 2, the mixture of step 1 is subjected to microwave modification to obtain a dry composite enhanced hydrophobic agent, and the microwave modification conditions are the same as those for the microwave modification of the microporous molecular sieve.
[0020] Preferably, the mass ratio of the fly ash, the silane coupling agent and the polydimethylsiloxane is (2.0-4.0):(0.5-1.0):(0.5-1.0).
[0021] The composite enhanced hydrophobic agent prepared by adopting the above technical solution can realize premixing with the precursor and solid materials such as sand and polyvinyl alcohol fibers, thereby providing convenience for implementation.
[0022] Preferably, the viscosity regulator includes talcum powder 1.6-2.0 parts, sodium metasilicate 0.8-2 parts and alcohol ether 0.3-0.8 parts by weight.
[0023] Preferably, the alcohol ether is diethylene glycol methyl ether or diethylene glycol butyl ether.
[0024] Preferably, the styrene-acrylic emulsion is obtained by emulsion copolymerization of styrene and acrylic ester monomers, and the solid content is greater than 50%.
[0025] By adopting the above technical solution, the appropriate styrene-acrylic emulsion is selected to be compounded with the alkali-activated material, so that the hybrid cross-linking of organic and inorganic molecules can be realized, and the bonding strength is increased.
[0026] Preferably, the sand is iron tailings fine sand with a particle size of 0.3 mm.
[0027] By adopting the above technical solution, the appropriate sand is selected to be compounded with the alkali-activated cementitious body, so that the crack resistance effect can be achieved.
[0028] Preferably, the polyvinyl alcohol fiber has a length of 3 mm.
[0029] By adopting the above technical solution, the appropriate polyvinyl alcohol fiber is selected to be compounded with the alkali-activated cementitious body, so that the shrinkage reduction and crack resistance effects can be achieved.
[0030] In a second aspect, the application provides an alkali-activated solid waste anticorrosion and repair material and a preparation method, which adopts the following technical solution:
[0031] An alkali-activated solid waste anticorrosion and repair material and a preparation method, comprising the following steps:
[0032] Step one, the slag powder, fly ash, metakaolin, red mud, composite activator, composite reinforcing hydrophobic agent, viscosity regulator, polyvinyl alcohol fiber, and sand are dried respectively, and are fully mixed according to the weight ratio to form a mixture, which is sealed in a 25 kg packaging bag;
[0033] Step two, the mixture and water are weighed according to the required water-solid ratio, and the water is added while stirring with a high-speed stirrer, and the stirring time is controlled to be 60-120 s, and the remaining 1 / 3 of the water amount is reserved;
[0034] Step three, finally, the styrene-acrylic emulsion is added while stirring, and the remaining water amount is added, and the stirring time is controlled to be 120-180 s until the stirring is uniform.
[0035] By adopting the above technical solution, the solid raw materials are all dry materials, which are pre-mixed, and the pre-mixed material is uniformly stirred with water when implemented, and the styrene-acrylic emulsion is finally added, so that the dispersibility of each functional material is accelerated, the viscosity is appropriate, the full reaction of the alkali-activated solid waste anticorrosion and repair material is facilitated, the strength development is facilitated, and the convenience of implementation is achieved.
[0036] In summary, the application has the following beneficial effects:
[0037] The modified microporous molecular sieve and the alkali activator are compounded, fly ash, silane coupling agent and polydimethylsiloxane are atomized and granulated to modify, various functional materials and precursors are dry premixed, the convenience of the alkali-activated solid waste corrosion and repair material is provided, and the full dispersion and performance of the functional materials are provided.
[0038] The alkali-activated solid waste corrosion and repair material and the preparation method developed by the application make full use of solid waste materials, reduce carbon emissions, and have gradient release time of performance of each material, produce synergistic performance, and can realize adjustment of the performance of the alkali-activated solid waste corrosion and repair material and the preparation method by adjusting the proportion of the three composite functional materials, greatly improve the operability, and the microporous structure and non-transition zone characteristics of the alkali-activated material also effectively improve the corrosion resistance. DETAILED DESCRIPTION
[0039] In order to make the technical means, innovative features, purposes and effects of the application easy to understand, the application is further described below.
[0040] The embodiments described herein are specific embodiments of the application, used to illustrate the concept of the application, and are explanatory and exemplary, and should not be interpreted as limiting the embodiments of the application and the scope of the application. In addition to the embodiments described herein, those skilled in the art can also employ other technical solutions based on the disclosure of the claims and the specification of the application, which include technical solutions that make any obvious substitutions and modifications to the embodiments described herein.
[0041] Preparation Example
[0042] Preparation Example 1
[0043] The composite activator is prepared by the following steps:
[0044] Step 1: composite with water glass and 10 mol / L NaOH solution, the original modulus of the water glass is 3.2, the modulus of the water glass is adjusted to 2 by using NaOH particles, and the alkali-activated agent is aged at room temperature for more than 24 hours after sufficient stirring;
[0045] Step 2: the microporous molecular sieve is fully ball milled, 70% ethanol solution is added while stirring and heating, the temperature is raised to 60 degrees until a slurry with a solid content of 70% is formed, and then microwave modification is carried out, the microwave is 50GHz electromagnetic wave, the relative humidity of air is 60%, and the temperature is 50°C to obtain dry modified microporous molecular sieve;
[0046] Step 3: the modified microporous molecular sieve and the alkali-activated agent are fully mixed, stirred and dried, and then ground again to form a specific surface area of 350-400m2 / kg composite activator.
[0047] Preparation Example 2
[0048] The composite activator is prepared via the following steps:
[0049] Step 1, composite with water glass and 10 mol / L NaOH solution, the original modulus of the water glass is 3.2, the modulus of the water glass is adjusted to 1.0 using NaOH particles, the alkali activator is aged at room temperature for more than 24 hours after sufficient stirring;
[0050] Step 2, the microporous molecular sieve is fully ball milled, 70% ethanol solution is added, stirring is performed while the temperature is raised, the temperature is raised to 60 degrees until a slurry with a solid content of 70% is formed, then the dry modified microporous molecular sieve is prepared by microwave modification, the microwave is 100 GHz electromagnetic wave, the relative humidity of air is 60%, and the temperature is 50°C;
[0051] Step 3, the modified microporous molecular sieve is fully mixed, stirred, and dried with the alkali activator, and is ground again to form a composite activator with a specific surface area of 350-400 m 2 / kg composite activator.
[0052] Example 1
[0053] An alkali-activated solid waste anticorrosion and repair material, comprising the following raw materials: water 175 kg, slag powder 400 kg, fly ash 50 kg, metakaolin 50 kg, red mud 35 kg, composite activator of preparation example 1 20 kg, composite reinforcing hydrophobic agent 2.5 kg, viscosity modifier 20 kg, polyvinyl alcohol fiber (length 3 mm) 2.5 kg, styrene-acrylic emulsion 7.5 kg, powder defoaming agent 1 kg, and sand (<0.3 mm) 200 kg.
[0054] Specific preparation method of alkali-activated solid waste anticorrosion and repair material:
[0055] Step 1, the slag powder, fly ash, metakaolin, red mud, composite activator in preparation example 1, composite reinforcing hydrophobic agent, viscosity modifier, polyvinyl alcohol fiber, powder defoaming agent, and sand are respectively dried and fully mixed according to the weight ratio to form a mixture;
[0056] Step 2, pour the mixture into a stirring pot, weigh the water, and add the water while stirring with a high-speed stirrer, the stirring time is controlled to be 60-120 s, and the remaining 1 / 3 of the water is added;
[0057] Step 3, finally, weigh the styrene-acrylic emulsion, add the styrene-acrylic emulsion while stirring, and add the remaining amount of water, the stirring time is controlled to be 120-180 s until the stirring is uniform.
[0058] Example 2
[0059] The difference from Example 1 is that the composite accelerator is adjusted to 25 kg, and the rest is the same as Example 1.
[0060] Example 3
[0061] The difference from Example 1 is that the composite accelerator is adjusted to 30 kg, and the rest is the same as Example 1.
[0062] Example 4
[0063] The difference from Example 3 is that the composite hydrophobicity enhancer is adjusted to 2 kg, and the rest is the same as Example 3.
[0064] Example 5
[0065] The difference from Example 3 is that the composite hydrophobicity enhancer is adjusted to 3 kg, and the rest is the same as Example 3.
[0066] Example 6
[0067] The difference from Example 3 is that the composite hydrophobicity enhancer is adjusted to 3.5 kg, and the rest is the same as Example 3.
[0068] Example 7
[0069] The difference from Example 4 is that the viscosity regulator is adjusted to 15 kg, and the polyvinyl alcohol fiber is adjusted to 1.5 kg, and the rest is the same as Example 4.
[0070] Example 8
[0071] The difference from Example 4 is that the viscosity regulator is adjusted to 25 kg, and the polyvinyl alcohol fiber is adjusted to 2 kg, and the rest is the same as Example 4.
[0072] Example 9
[0073] The difference from Example 4 is that the viscosity regulator is adjusted to 30 kg, and the polyvinyl alcohol fiber is adjusted to 1 kg, and the rest is the same as Example 4.
[0074] Example 10
[0075] The difference from Example 8 is that the styrene-acrylic emulsion is adjusted to 9 kg, and the rest is the same as Example 8.
[0076] Example 11
[0077] The difference from Example 8 is that the styrene-acrylic emulsion is adjusted to 11 kg, and the rest is the same as Example 8.
[0078] Example 12
[0079] The difference from Example 8 is that the styrene-acrylic emulsion is adjusted to 13 kg, and the rest is the same as Example 8.
[0080] Example 13
[0081] The difference from Example 3 is that the composite initiator is adjusted to Preparation Example 2, and the rest is the same as Example 3.
[0082] Example 14
[0083] The difference from Example 4 is that the composite initiator is adjusted to Preparation Example 2, and the rest is the same as Example 4.
[0084] Example 15
[0085] The difference from Example 8 is that the composite initiator is adjusted to Preparation Example 2, and the rest is the same as Example 8.
[0086] Example 16
[0087] The difference from Example 11 is that the composite initiator is adjusted to Preparation Example 2, and the rest is the same as Example 8.
[0088] Table 1 Test Results
[0089]
[0090] Note: The water contact angle of the coating is tested according to the national standard “GB / T 30447-2013”; the surface and real dry times of the coating are determined according to the national standard “GB / T 1728-1979”; the flow degree of the coating paste is tested according to the national standard “GB / T 8077-2000”; the setting time of the coating paste is tested according to the national standard “GB / T 1346-2011”; the adhesion between the coating and the steel plate / cement plate is tested according to the national standard “GB / T 5210-2016”; the water resistance of the coating is tested according to the national standard “GB / T 1733-93”; and the compressive strength is tested according to the national standard “GB / T 50081-2019” using a pressure testing machine with a loading speed controlled at 1 kN / s.
[0091] As can be seen from Examples 1-16 and in combination with Table 1, the setting time, surface and real dry times, bonding strength before and after corrosion, compressive strength before and after corrosion, and flow degree of the alkali-activated solid waste anticorrosion and repair material prepared in the present application are all relatively appropriate, the construction effect is relatively good, and the water resistance of Examples 3-16 is relatively good.
[0092] In combination with Examples 1-3, the composite activator prepared by modifying the microporous molecular sieve can effectively play its activation performance. With the increase of the dosage, sodium silicate and sodium hydroxide are continuously released, and the binary activator continuously reacts with the dissolved silicon-aluminum material (mineral powder, fly ash, metakaolin) to form more molecular bonds, so that the interface transition zone almost does not exist, thereby the compressive strength gradually increases, the setting time and the surface drying time are reduced, and the activation effect is remarkable. In Comparative Examples 4-6, with the increase of the composite reinforcing hydrophobic agent, the silane coupling agent promotes the hybrid crosslinking of the organic and inorganic components, effectively enhancing the integrity, and the polydimethylsiloxane is continuously dissolved and released from the granules, promoting the contact angle of the coating surface to continuously increase, and the hydrophobicity to become better, indicating that the composite hydrophobic agent formed by atomization and granulation can effectively play its performance.
[0093] In combination with Examples 7-9, the increase of the viscosity regulator, the talc has a flaky structure and has a good flow aid effect, and the sodium metasilicate also has a viscosity regulating effect, and the alcohol ether can effectively reduce the friction between the solid particles, and can effectively improve the flowability of the alkali-activated solid waste corrosion-resistant and repair material. At the same time, after the flowability is improved, the free water will increase, promoting the setting time and the surface drying time to slightly extend, and the bonding strength to increase. The increase or decrease of the polyvinyl alcohol fiber will have little effect on the flowability, but the main effect is the bridging effect of the short fibers, which will promote the formation of stress-strain hardening enhancement phenomenon, reflecting the ECC properties, and being good for crack resistance.
[0094] In combination with Examples 10-12, the increase of the styrene-acrylic emulsion dosage, the organic macromolecules after demulsification will form a space network structure, especially at the interface, a penetration bridging effect will occur, improving the bonding strength, but the setting time and the surface drying time will be extended, and the compressive strength will be reduced.
[0095] In combination with Examples 13 and 3, Examples 14 and 4, Examples 15 and 8, and Examples 16 and 11, the increase of the microwave modification temperature of the composite activator can effectively increase the adsorption capacity of the microporous molecular sieve, and the same dosage can improve the activation effect of the composite activator.
[0096] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.
Claims
1. A base-activated solid waste anticorrosive and repairing material, characterized in that, The composition comprises the following components in parts by weight: water 15-25 parts, slag powder 35-45 parts, fly ash 5-8 parts, metakaolin 5-8 parts, red mud 3-5 parts, composite activator 3-5 parts, composite reinforcing hydrophobic agent 0.2-0.8 parts, viscosity regulator 3-5 parts, polyvinyl alcohol fiber 0.2-0.8 parts, styrene-acrylic emulsion 0.8-1.5 parts, powder defoaming agent 0.1-0.7 parts, and sand 20-30 parts.
2. The alkali-activated solid waste anticorrosive and repairing material according to claim 1, characterized in that, The slag powder, fly ash and metakaolin have a specific surface area of 410 m 2 / kg, 380 m 2 / kg, 420 m 2 / kg, and a proportionally integrated activity index greater than 85%.
3. The alkali-activated solid waste anticorrosive and repairing material according to claim 1, characterized in that, The red mud contains 36% calcium oxide, 32% silicon oxide and 12% aluminum oxide.
4. The method according to any one of claims 1-3, characterized in that, The method comprises the following steps: Step 1, preparing the composite activator, the composite reinforcing hydrophobic agent and the viscosity regulator; Step 2, drying the slag powder, the fly ash, the metakaolin, the red mud, the composite activator, the composite reinforcing hydrophobic agent, the viscosity regulator, the polyvinyl alcohol fiber, the powder defoaming agent and the sand, and mixing them thoroughly according to the weight ratio to form a mixture; Step 3, weighing the mixture and water, and stirring them with a high-speed stirrer while adding water, and the stirring time is controlled to be 60-120 seconds, and 1 / 3 of the water is reserved; Step 4, stirring while adding the styrene-acrylic emulsion, and adding the remaining water, and the stirring time is controlled to be 120-180 seconds until the mixture is stirred uniformly.
5. The method according to claim 4, characterized in that, The composite activator is prepared by the following steps: Step 1, compounding the water glass and the 10 mol / L NaOH solution, the original modulus of the water glass is 3.2, the modulus of the water glass is adjusted to 2 by using NaOH particles to prepare the alkali activator, and the alkali activator is aged at room temperature for more than 24 hours for standby; Step 2, ball-milling the microporous molecular sieve, adding an ethanol solution, stirring and heating until a slurry with a solid content of 65-75% is formed, then performing microwave modification to prepare dry modified microporous molecular sieve, and then mixing, stirring and drying the modified microporous molecular sieve and the alkali activator to form the composite activator.
6. The method according to claim 5, wherein the method is characterized in that, The microwave modification condition is that the microwave is an electromagnetic wave with a frequency of 50-100 GHz, the air relative humidity is 50-70%, and the temperature is 40-55℃.
7. The method according to claim 5, characterized in that, The mass ratio of the microporous molecular sieve to the alkali activator is (1.9-2.6):(1.2-2.2).
8. The method according to claim 4, characterized in that, The composite reinforcing hydrophobic agent is prepared by the following steps: Step 1, atomizing the silane coupling agent and the polydimethylsiloxane in an atomization chamber, and blowing the fly ash into the chamber by using a wind speed machine so that the fly ash particles are uniformly adhered to the silane coupling agent and the polydimethylsiloxane; Step 2, performing microwave modification on the mixture of step 1 to prepare dry composite reinforcing hydrophobic agent.
9. The method according to claim 8, characterized in that, The mass ratio of the fly ash, the silane coupling agent and the polydimethylsiloxane is (2.0-4.0):(0.5-1.0):(0.5-1.0).
10. The method according to claim 4, characterized in that, The viscosity regulator comprises, in parts by weight, 1.6-2.0 parts of talcum powder, 0.8-2 parts of sodium metasilicate and 0.3-0.8 parts of alcohol ether.
11. The method according to claim 10, wherein the method is characterized in that, The alcohol ether is diethylene glycol methyl ether or diethylene glycol butyl ether.
12. The method according to claim 4, characterized in that, The styrene-acrylic emulsion is obtained by emulsion copolymerization of styrene and acrylic ester monomers, and the solid content is greater than 50%.
13. The method according to claim 4, characterized in that, The sand is fine sand of iron tailings with a particle size of 0.3 mm.