An internal maintenance material suitable for road base courses made of aeolian sand, its preparation method and application

Abstract

The application provides an internal curing material suitable for aeolian sand road base, a preparation method and application thereof, and belongs to the technical field of road engineering.The internal curing material suitable for aeolian sand road base comprises the following raw materials: 25%-28% of alpha-methacrylic acid; 12%-14% of gamma-polyglutamic acid; 5%-20% of N-isopropyl acrylamide; 2%-3% of carrageenan; 0.3%-0.5% of malt dextrin; 0.5%-0.8% of cellulose ether; 0.8%-1.0% of lauryl alcohol polyoxyethylene ether; 12%-16% of expanded perlite powder; 1%-1.5% of viscosity regulator; 10%-11% of oil phase material; and 29.4%-42.1% of auxiliary material.The internal curing material suitable for aeolian sand road base has a bonding effect, and has water absorption-water retention-water release performance, can increase the bonding force between the superabsorbent resin SAP and cement and aggregate, and solves the technical problem of poor viscosity of the internal curing material in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of road engineering technology, specifically relating to an internal maintenance material suitable for the base course of wind-blown sand roads, its preparation method, and its application. Background Technology

[0002] In desert regions, high-quality fill materials are extremely scarce. Coupled with sparse populations and logistical difficulties, transporting road construction materials over long distances is extremely challenging, significantly increasing project costs. Aeolian sand, however, is abundant, exhibits minimal settlement and deformation, is loosely granulated, has low cohesion, low natural moisture content, high permeability, and poor water retention. It also possesses high density under both natural and optimal moisture conditions. Therefore, highway construction can fully utilize aeolian sand as a substitute for other fine aggregates, adhering to the principle of local sourcing, to achieve the strength and stability required for semi-rigid base courses. Aeolian sand, as a special road construction material, is abundant in desert areas and is the most important basic material for highway construction in these regions, representing the best choice for road construction. Applying aeolian sand to highway construction in desert areas offers advantages such as low consumption, low emissions, low pollution, high efficiency, and high economic benefits.

[0003] While aeolian sand road materials have significant advantages, they also have some drawbacks. For example, the application of aeolian sand is limited, and the cracking caused by thermal shrinkage and drying shrinkage of semi-rigid base layers in desert areas has not been adequately considered. Furthermore, monitoring studies on road stability in seasonally frozen areas primarily focus on the subgrade, with limited research on the overall structural monitoring of roads in desert regions. There is also a lack of research on the strength characteristics, mechanical properties, and road performance of cement-stabilized graded crushed stone mixtures incorporating aeolian sand. This results in unresolved issues regarding the feasibility of using aeolian sand as a substitute filler in cement-stabilized graded crushed stone mixtures in practical engineering projects, as well as the upper limit of aeolian sand content for use in cement-stabilized graded crushed stone mixtures. Some scholars have explored the effects of different aeolian sand and superabsorbent polymer (SAP) dosages on the strength characteristics and durability of cement-stabilized graded crushed stone mixtures. Other studies have shown that adding a certain amount of fly ash active powder as a binder can improve the crack resistance of the base layer.

[0004] To address issues such as reflective cracking and poor adhesion in aeolian sand roads, numerous studies suggest that internal curing materials can be used for internal maintenance of newly paved aeolian sand roads. This can effectively alleviate problems like drying shrinkage cracks and poor cohesion in the base layer, and promote stable strength growth in the later stages. However, existing commercially available internal curing materials, after absorbing liquid and swelling in aeolian sand roads, become gel-like, but have poor or almost no adhesion and low strength. Under external conditions or vehicle loads, transverse and longitudinal cracks, collapse, and loosening occur inside the aeolian sand road surface. Furthermore, the internal curing gel may experience structural rupture, leading to premature release of internal moisture, which reduces the performance of the aeolian sand road and weakens the curing efficiency of the internal curing materials.

[0005] Chinese patent CN113461363B discloses a compaction-resistant semi-rigid base internal curing and water-retaining material, which significantly improves the mechanical properties and service life of the semi-rigid base and reduces maintenance costs. However, this internal curing material has poor or almost no adhesion and low strength. Under external conditions or vehicle loads, transverse and longitudinal cracks, collapses, and loosening will appear inside the wind-blown sand road. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention aims to provide an internal maintenance material, its preparation method and application, so as to solve the technical problem of poor adhesion of the internal maintenance material applicable to the base course of wind-blown sand roads in the prior art.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] This invention provides an internal maintenance material suitable for the base course of wind-blown sand roads, comprising the following raw materials by mass fraction: 25%~28% α-methacrylic acid;

[0009] γ-polyglutamic acid 12%~14%;

[0010] N-Isopropylacrylamide 5%~20%;

[0011] Carrageenan 2%~3%;

[0012] Maltodextrin 0.3%~0.5%;

[0013] Cellulose ethers: 0.5%~0.8%;

[0014] Lauryl alcohol polyoxyethylene ether 0.8%~1.0%;

[0015] Expanded perlite powder 12%~16%;

[0016] Viscosity modifier: 1%~1.5%; 805 viscosity modifier

[0017] Oil phase material: 10%~11%

[0018] Auxiliary materials: 29.4%~42.1%.

[0019] Preferably, the oil phase material includes cyclohexane and polyvinylpyrrolidone, wherein the polyvinylpyrrolidone is 2.5% to 3.5% of the mass fraction of cyclohexane.

[0020] Preferably, the viscosity modifier is 805 viscosity modifier.

[0021] Preferably, the auxiliary materials include 4%~6% sodium amide, 0.2%~0.4% azobisisobutyramidine hydrochloride, 0.3%~0.4% potassium dithiooctaoxyate, 0.1%~0.2% sodium bisulfite, 5%~7% magnesium silicate monohydrate, 7%~8% hollow glass microspheres, 6%~9% nano boron nitride, 1.5%~2.5% diatomaceous earth, 3%~5% phosphogypsum, 0.5%~1% dihydroxysuccinic acid, 1.5%~2% vinyltrimethoxysilane, and 0.3%~0.6% 3-acrylidinylpropionate.

[0022] This invention also provides a method for preparing the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads, comprising the following steps:

[0023] Weigh each raw material according to the above mass fractions;

[0024] Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a dilute solution with a mass concentration of 17%~20%. Add weighed sodium amino acid and cool to room temperature. Then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate and sodium bisulfite in sequence. Stir to obtain mixture A.

[0025] The mixture of expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomite and phosphogypsum was modified to obtain mixture B. Mixture B was added to deionized water and stirred evenly to prepare a suspension with a mass concentration of 7% to 9%. The suspension was magnetically stirred for 25 minutes and recorded as the suspension of mixture B.

[0026] Polyvinylpyrrolidone was added to cyclohexane, and argon gas was introduced and stirred until homogeneous to form oil phase material C;

[0027] A pre-prepared dilute solution consisting of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether was slowly added to the oil phase C. Argon gas was passed through and the mixture was stirred until homogeneous. While stirring continuously, a suspension of mixture B was added, and the mixture was stirred to obtain mixture D.

[0028] Mixture A and 805 viscosity modifier with mixture D, and maintain the temperature at 35℃~45℃. Add the weighed 3-acrylidinylpropionate and mix. Stir mechanically at 330~350 r / min for 4.5h~5h to obtain composite E. After washing composite E several times, an internal maintenance material suitable for the base course of wind-blown sand roads is obtained.

[0029] Further preferably, γ-polyglutamic acid and α-methacrylic acid are prepared into a dilute solution with a mass concentration of 17%.

[0030] More preferably, mixture B is prepared into a suspension with a mass concentration of 7% to 9%.

[0031] In a further preferred embodiment, the stirring conditions in the preparation method of mixture A specifically include: mechanical stirring at 45℃~55℃ for 3~4 hours.

[0032] In a further preferred embodiment, in the preparation method of oil phase material C, after argon gas is introduced, the mixture is mechanically stirred at a speed of 180 r / min to 210 r / min for 25 min to 30 min in a constant temperature water bath environment of 40℃ to 60℃ to form oil phase material C.

[0033] In a further preferred embodiment, in the preparation method of mixture D, the stirring conditions after introducing argon gas are: mechanical stirring at a speed of 280 r / min to 300 r / min for 25 min to 30 min in a constant temperature water bath environment of 40℃ to 50℃; and the stirring conditions after adding the suspension of mixture B are: mechanical stirring at a speed of 300 r / min to 330 r / min for 25 min to 28 min.

[0034] Preferably, in the preparation of mixture D, the volume ratio of the dilute solution, oil phase C, and mixture B suspension is 1:5:16.

[0035] Preferably, the mass concentration of the dilute solution composed of carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether is 2% to 3%, and the preparation method includes: adding carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stirring evenly.

[0036] Further preferably, the mass concentration of the dilute solution composed of carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether is 2%.

[0037] Preferably, the modification process includes: uniformly mixing the mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum in a hydrolysate of vinyltrimethoxysilane, stirring with argon gas, and then allowing it to stand for a period of time until stratification occurs. The mixture is then filtered through a filter screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum, denoted as mixture B;

[0038] In a further preferred embodiment, the mixing and drying processes in the preparation method of mixture B are as follows: magnetic stirring at 60℃~80℃ for 30~40 min, drying at 85℃~95℃ for 28~28.5 h, and the mesh size of the filter screen is 100~120 mesh.

[0039] More preferably, the above stirring and drying conditions include: magnetic stirring at 60°C for 30 min, drying at 85°C for 28 h, and a filter screen with a mesh size of 100 mesh.

[0040] Preferably, the method for preparing the above-mentioned vinyltrimethoxysilane hydrolysate includes mixing vinyltrimethoxysilane with dihydroxysuccinic acid, hydrolyzing vinyltrimethoxysilane under the action of dihydroxysuccinic acid, adding a certain amount of a mixture of deionized water and anhydrous ethanol to obtain the vinyltrimethoxysilane hydrolysate; the mass ratio of the mixture of anhydrous ethanol and deionized water, dihydroxysuccinic acid and vinyltrimethoxysilane is 14:3:1.

[0041] More preferably, mixture A and 805 viscosity modifier are mixed with mixture D by dripping, with a dripping rate of 60-120 drops / minute and a total dripping time not exceeding 100 minutes.

[0042] The above technical solution can ensure sufficient reaction and uniform mixing between mixture A and 805 viscosity modifier by controlling the dropping rate and total dropping time, thereby avoiding uneven performance caused by excessively high or low local concentrations.

[0043] In a further preferred embodiment, complex E is washed with dimethyl methanol 4 to 6 times, and after the dimethyl methanol has evaporated, it is dried at 40°C for 1.5 h to 2 h.

[0044] The above technical solution uses dimethyl methanol to clean the complex E, which can remove unreacted raw materials and impurities, thereby improving the purity and performance of the final material.

[0045] The present invention also provides the application of the above-mentioned internal maintenance material suitable for aeolian sand road base in aeolian sand road base.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] This invention provides an internal curing material suitable for the base course of aeolian sand roads. It has an adhesive effect and strong water absorption, retention and release properties. While ensuring the internal curing efficiency of aeolian sand road projects, it can increase the bonding force between superabsorbent resin and cement and aggregate. The γ-polyglutamic acid in the raw materials of the internal maintenance material suitable for the base course of aeolian sand roads is an excellent environmentally friendly polymer material that can be used as a water-retaining agent and adsorbent. Its degradation product is pollution-free glutamic acid. γ-polyglutamic acid, α-methacrylic acid, and N-isopropylacrylamide continuously crosslink and copolymerize with carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to form an interpenetrating network structure. In this process, the adhesive components carrageenan and cellulose ether are grafted onto the branches, continuously filling the expanded perlite powder. This not only gives the internal maintenance material adhesiveness and elasticity but also significantly improves its liquid absorption rate. In addition, its excellent liquid storage function can effectively regulate the humidity distribution inside the aeolian sand road to a certain extent, ensuring the water demand of the road during maintenance. Therefore, the internal maintenance material prepared by this invention makes a significant contribution to the shrinkage, workability, mechanical properties, durability, and service life of aeolian sand roads, and solves the technical problem of poor adhesion in existing internal maintenance materials.

[0048] Furthermore, in the oil phase material, cyclohexane is used as a solvent, and polyvinylpyrrolidone is used as a thickener and stabilizer. Their combination can form a stable oil phase system, which helps to uniformly disperse and mix other components, thereby improving the overall performance of the material.

[0049] Furthermore, the viscosity modifier is 805 viscosity modifier, which helps to adjust the viscosity of the material to give it suitable fluidity, making it easy to apply and work.

[0050] Furthermore, in the auxiliary materials, sodium amide is used to adjust the pH value of the solution, azobisisobutyramidine hydrochloride is used as an initiator, and magnesium silicate monohydrate, hollow glass microspheres, nano-boron nitride, diatomaceous earth, and phosphogypsum, after modification, can significantly improve the strength and durability of the material. Expanded perlite, magnesium silicate monohydrate, diatomaceous earth, and phosphogypsum, among other components, possess high porosity, nanopore size, and low density. These three components not only have moderate hardness and can be used as fillers in internal curing materials, providing a rigid framework structure, but their uniform and fine pores also provide attachment points for organic monomer composites. The increased three-dimensional network structure and the interpenetrating network structure formed by cross-linking copolymerization intersect to form a complex gel bonding interface. This gel network has a large space, good elasticity and viscosity, and a strong ability to encapsulate water, making it less prone to leakage. Magnesium silicate monohydrate, hollow glass microspheres, nano-boron nitride, and diatomaceous earth are all inorganic amorphous hard particulate powders with stable chemical properties. They are acid and alkali resistant, chemically inert, and have a low expansion coefficient. As auxiliary and filler materials for the rigid skeleton of internal curing materials, they can significantly enhance the rigidity of the internal curing microspheres, ensuring that the internal curing materials will not crack or release water under wheel loads during semi-rigid base application. Due to the strong permeability and water absorption of diatomaceous earth, the synthesized internal curing microspheres retain a large amount of moisture, greatly improving the water absorption ratio. The internal curing material of this invention becomes viscous after absorbing liquid and expanding, adhering to the interface of cement and aggregate. After a certain period of time, under the action of osmotic pressure, the water inside the material is slowly released, which helps prevent the evaporation and loss of moisture in aeolian sand roads, controls and reduces the shrinkage of the base layer, and ensures that the aeolian sand road material is fully hydrated. In addition, a certain amount of expanded perlite powder and phosphogypsum powder are dispersed in the internal curing material, which has a certain auxiliary effect on resisting shrinkage, bending, deformation and fracture during the application of aeolian sand road projects. Generally, after the internal curing material releases water, it will leave pores inside the base layer, and the presence of expanded perlite powder and phosphogypsum powder can make up for this defect. The internal curing material of this invention maintains the structural integrity of the internal curing gel under external conditions and vehicle loads, preventing cracking. This avoids problems such as drying shrinkage, temperature shrinkage, poor cohesion, poor encapsulation, segregation, and water seepage, reducing the expansion of reflective cracks inside the aeolian sand road base layer, improving the workability, mechanical properties, strength, and durability of the aeolian sand road base layer, effectively ensuring the quality and service life of aeolian sand road projects, and reducing subsequent maintenance costs. It has significant value for promoting the high performance of aeolian sand base layers and improving the production and application technology of aeolian sand road projects.

[0051] This invention also discloses a method for preparing the aforementioned internal protective material. The entire preparation process is relatively simple and does not require professional technical personnel to operate and guide it. It can be carried out simply by following the description of this invention.

[0052] Furthermore, the volume ratios of the dilute solution, oil phase C, and mixture B in the suspension were clarified, which is crucial for controlling the performance and stability of the final product. By adjusting the proportions of these components, the strength, stability, and biocompatibility of the internal maintenance material can be further optimized.

[0053] Furthermore, the dilute solutions of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether have appropriate concentrations, which facilitate their uniform dispersion and reaction during subsequent processing, thereby improving the performance of the final material.

[0054] Furthermore, modifying inorganic fillers with a hydrolysate of vinyltrimethoxysilane can enhance the interaction between the filler and the polymer matrix, thereby improving the mechanical properties and durability of the internal curing material. In addition, the modified filler can be better dispersed in the polymer matrix, preventing agglomeration.

[0055] Furthermore, the hydrolysis of vinyltrimethoxysilane under the action of dihydroxysuccinic acid helps to form a stable silane hydrolysate, which is crucial for subsequent material modification. Simultaneously, the addition of a mixture of deionized water and anhydrous ethanol can further adjust the viscosity and stability of the hydrolysate. By precisely controlling the mass ratio of vinyltrimethoxysilane, dihydroxysuccinic acid, and the mixture of anhydrous ethanol and deionized water, the smooth progress of the hydrolysis process can be ensured, resulting in a hydrolysate with stable properties.

[0056] This invention also provides the application of the aforementioned internal curing material in the base course of aeolian sand roads, which can significantly improve the durability and stability of the roads. By providing a material with adhesive properties, high strength, internal curing, and slow-release water retention, it effectively addresses the unique geological and environmental challenges of aeolian sand areas and extends the service life of roads. Attached Figure Description

[0057] Figure 1 This is a SEM image of the internal maintenance material for the road base layer of aeolian sand, applicable to the present invention.

[0058] Figure 2 This is a diagram showing the test results of the flowability of the internal maintenance material for the road base layer of aeolian sand, applicable to the present invention.

[0059] Figure 3 This is a diagram showing the test results of the unconfined compressive strength of the internal maintenance material for the base course of aeolian sand roads, which is applicable to the present invention.

[0060] Figure 4 This is a diagram showing the indirect tensile strength test results of the internal maintenance material for the road base layer of aeolian sand, which is applicable to the present invention.

[0061] Figure 5 This is a shrinkage rate diagram of the internal maintenance material of the present invention applicable to the road base layer of aeolian sandy soil, after 28 days. Detailed Implementation

[0062] To enable those skilled in the art to understand the features and effects of the present invention, the following descriptions and definitions are only general descriptions of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in the event of any conflict, the definitions in this specification shall prevail.

[0063] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0064] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0065] In this article, unless otherwise specified, “contains,” “includes,” “contains,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of”. For example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a”.

[0066] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0067] The present invention will now be described in further detail:

[0068] An internal maintenance material suitable for the base course of wind-blown sand roads, comprising the following raw materials: α-methacrylic acid, γ-polyglutamic acid, sodium amino acid, N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, sodium bisulfite, expanded perlite powder, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, phosphogypsum, dihydroxysuccinic acid, vinyltrimethoxysilane, carrageenan, maltodextrin, cellulose ether, lauryl polyoxyethylene ether, 805 viscosity modifier, 3-acrylidinylpropionate, and oil phase material;

[0069] Specifically:

[0070] By mass fraction, it includes the following raw materials: α-methacrylic acid 25%~28%, γ-polyglutamic acid 12%~14%, sodium amide 4%~6%, N-isopropylacrylamide 5%~20%, azobisisobutyramidine hydrochloride 0.2%~0.4%, potassium dithiooctaoxyate 0.3%~0.4%, sodium bisulfite 0.1%~0.2%, expanded perlite powder 12%~16%, magnesium silicate monohydrate 5%~7%, hollow glass microspheres 7%~8%, nano boron nitride 6%~9%, diatomaceous earth 1.5%~2.5%, and phosphogypsum 3%. ~5%, dihydroxysuccinic acid 0.5%~1%, vinyltrimethoxysilane 1.5%~2%, carrageenan 2%~3%, maltodextrin 0.3%~0.5%, cellulose ether 0.5%~0.8%, lauryl alcohol polyoxyethylene ether 0.8%~1.0%, 805 viscosity modifier 1%~1.5%, 3-acrylidinylpropionate 0.3%~0.6%, oil phase material 10%~11%; wherein the oil phase material is cyclohexane and polyvinylpyrrolidone, wherein the polyvinylpyrrolidone is 2.5%~3.5% of the mass fraction of cyclohexane.

[0071] The expanded perlite powder is a natural acidic glassy volcanic lava, a white, porous, honeycomb-structured granular inorganic material with a particle size of 15μm~75μm, an expansion ratio of 15 times, and a density of <70kg / m³. 3 Its surface contains hydrophilic and highly polar silanol groups (Si-OH) and silyl ether groups (Si-O-Si). Expanded perlite powder is a suspended white powdery solid formed above the receiving hopper after instantaneous high-temperature calcination and expansion. Its chemical composition is mainly SiO2, with a content of about 70%. It consists of spherical fine particles with porous cavities inside, a vitrified and sealed surface, a smooth luster, and stable physical and chemical properties. It is used to provide a rigid internal curing material skeleton.

[0072] The magnesium silicate monohydrate exhibits a pearly luster on its surface, a fibrous cross-section, a particle size of 12.06 μm, and a density of 2.032 g / cm³. 3 ~2.035g / cm 3 Its Mohs hardness is 2~2.5, and its surface area is 800~900m². 2 / g, internal surface area 500 m² 2 / g, external surface area 400 m² 2 / g, moistened magnesium silicate monohydrate has extremely strong binding properties. Magnesium silicate monohydrate is a hydrous magnesium silicate clay mineral with a layered chain structure. It has the characteristics of low shrinkage, good plasticity, large specific surface area, and strong adsorption. Its component, magnesium silicate, can react with calcium hydroxide on the surface of aggregate in the pores to form hydrated calcium silicate gel, which can effectively improve the internal structure of cement-based materials.

[0073] The hollow glass microspheres are a novel, lightweight material in the micrometer range. Their main component is borosilicate, with a particle size of 10 μm to 250 μm, a wall thickness of 1 μm to 2 μm, and a density of 0.1 to 0.7 g / cm³. 3 It has the characteristics of high compressive strength, good crack resistance, and small coefficient of thermal shrinkage.

[0074] The boron nitride nanoparticles have an average particle size of 50 nm, a purity >99.9%, and a bulk density of 0.11 g / cm³. 3 Specific surface area 43.6 m² 2 / g, Mohs hardness 4, hexagonal crystal form.

[0075] The diatomaceous earth is grayish-white and has a density of 1.9~2.3 g / cm³. 3 Bulk density 0.34~0.65 g / cm³ 3 Melting point 1650℃~1750℃, specific surface area 19~65cm² 2 / g, pore volume 0.45~0.98cm³ 3 / g, the water absorption rate is 2 to 4 times its own volume.

[0076] The phosphogypsum is a gray, powdery inorganic material with a density of 2.25~2.35 g / cm³. 3 Particle size 10μm~60μm, specific surface area 71~96cm² 2 / g, with a water content of 20%~25%, melting point 1450℃, slightly soluble in water. Phosphogypsum is an industrial byproduct produced during the wet process of phosphoric acid production. Its main component is calcium sulfate dihydrate (CaSO4·2H2O), accounting for approximately 70%~90%. It has fine and uniformly distributed particles, an internal crystalline structure, strong hygroscopicity, and adjustable setting time. Phosphogypsum has a loose texture and a certain degree of plasticity. Its physicochemical properties are relatively stable in suitable environments. It is commonly used as a conditioning filler or as a reinforcing skeleton component in internal curing materials.

[0077] The dihydroxysuccinic acid is a white crystalline powder with an acidic odor. It is stable in air and exists in anhydrous and crystalline forms. Its purity is >99.5%, melting point is 200℃~206℃, and density is 1.697 g / cm³. 3 Its water solubility is 20.6%.

[0078] The vinyltrimethoxysilane is a colorless, transparent liquid with a density of 0.496 g / cm³. 3 It has a boiling point of 217℃ and a refractive index of 1.42, which improves the wettability and dispersibility of fillers in polymers.

[0079] Carrageenan is a linear polysaccharide compound composed of 3,6-dehydrated-D-galactose residues and D-galactose. The galactose residues contain sulfate ester groups, which are classified into κ and λ groups according to their number and position.

[0080] The maltodextrin is a white powder or granules, slightly absorbent of water, and easily soluble or dispersible in water.

[0081] The cellulose ether is generally a white or off-white, odorless, non-toxic, free-flowing fibrous powder. The cellulose ether is dissolved in water in colloidal form, and its viscosity depends on its degree of polymerization.

[0082] The lauryl alcohol polyoxyethylene ether is a new generation of synthesized polyether. It is a non-toxic, harmless, green and environmentally friendly product with good compatibility with water. The polycarboxylate-based high-performance water-reducing agent prepared with this material has the characteristics of low dosage, high water reduction rate, minimal slump loss, good volume stability and no corrosion to steel bars.

[0083] The 805 viscosity modifier is white to slightly yellow cellulose in appearance, with a moisture content of ≤30%, a viscosity of 80~300mPa·s, and a pH value of 9~11.

[0084] The 3-acrylidinylpropionate has a purity of ≥99%, a density of 1.224 g / cm3, a boiling point of 512.6℃, a refractive index of 1.541, a flash point of 236.8℃, and a PSA of 87.93.

[0085] The N-isopropylacrylamide is a white to pale yellow solid with a melting point of 60-63°C, a boiling point of 89-92°C, a molar refractive index of 33.15, and a molar volume of 128.9 cm³. 3 / mol, surface tension 25.6mN / m.

[0086] The azobisisobutyramidine hydrochloride is a white powder with a molecular weight of 271.19 and a density of 0.42 g / cm³. 3 Melting point 175~177℃, flash point 115.3℃.

[0087] The potassium dithiooctaoxyate is a white crystalline inorganic compound with a molecular weight of 270.32, a relative density of 2.477, and a density of 2.47 g / cm³. 3 It has a melting point of 1067℃ and a boiling point of 1689℃.

[0088] The sodium bisulfite is a white crystalline powder with a molecular weight of 104.06, a NaHSO3 content of ≥99.5%, a pH of 4.0~5.0, a melting point of 150℃, and a relative density of 1.48.

[0089] The α-methacrylic acid is a colorless crystalline or transparent liquid with a pungent odor. It is soluble in hot water and most organic solvents such as ethanol and ether. It has a boiling point of 161°C, a melting point of 15°C, and a flash point of 68°C. Its monomers can be homopolymerized or copolymerized.

[0090] Furthermore, the γ-polyglutamic acid, also known as natto gum, is a water-soluble polyamino acid produced by microbial fermentation in nature. Its structure is a high molecular polymer in which glutamic acid units form peptide bonds through α-amino and γ-carboxyl groups. It has excellent water solubility, super strong adsorption and biodegradability. The degradation product is pollution-free glutamic acid, making it an excellent environmentally friendly polymer material.

[0091] Sodium amino acid is a white crystalline powder with an ammonia odor. It begins to volatilize at 400℃ and decomposes into elemental substances at 500-600℃. It has a melting point of 208℃, a boiling point of 400℃, and a heat of formation of -118.8 KJ / mol. It decomposes violently in water, producing sodium hydroxide and ammonia.

[0092] A method for preparing an internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0093] Step 1: Weigh out the above raw materials according to their weight;

[0094] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a dilute solution with a mass concentration of 17%. Add the weighed sodium amino acid and cool to room temperature. Then add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate and sodium bisulfite in sequence and stir evenly to obtain mixture A.

[0095] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0096] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0097] Step 5: The evenly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum are uniformly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through and stirred. After standing for a period of time, the mixture will separate into layers. The mixture is then filtered through a filter screen. The remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum, which is denoted as mixture B.

[0098] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0099] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0100] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0101] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40℃. While stirring continuously, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D.

[0102] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, keeping the temperature at 35℃~45℃. After the dropwise addition is complete, add the weighed 3-acrylidinylpropionate and stir mechanically at 330 r / min for 4.5 h to obtain complex E.

[0103] Step 11: Wash compound E several times with dimethyl methanol, and after no more dimethyl methanol evaporates, obtain a high-strength internal curing slow-release water-retaining material for wind-blown sand roads.

[0104] Anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0105] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0106] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" represents weight percentage, "parts" represents parts by weight, and "ratio" represents weight proportion.

[0107] The present invention will now be described in detail with reference to embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

[0108] The following detailed descriptions are all illustrative of embodiments and are intended to provide a further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the present invention.

[0109] Example 1

[0110] This example provides an internal maintenance material suitable for the base course of aeolian sand roads, which, by mass fraction, includes the following raw materials:

[0111] α-Methacrylic acid 25%, γ-polyglutamic acid 12%, sodium amino acid 4%, N-isopropylacrylamide 6%, azobisisobutyramidine hydrochloride 0.2%, potassium dithiooctaoxyate 0.3%, sodium bisulfite 0.1%, expanded perlite powder 13%, magnesium silicate monohydrate 5%, hollow glass microspheres 7%, nano boron nitride 6%, diatomaceous earth 1.5%, phosphogypsum 3%, dihydroxysuccinic acid 0.5%, vinyltrimethoxysilane 1.5%, carrageenan 2%, maltodextrin 0.3%, cellulose ether 0.5%, lauryl alcohol polyoxyethylene ether 0.8%, 805 viscosity modifier 1%, 3-acrylidinylpropionate 0.3%, oil phase material 10%.

[0112] In the oil phase material, vinylpyrrolidone accounts for 3% of the mass of cyclohexane.

[0113] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0114] The preparation method of the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0115] Step 1: Weigh out the above raw materials according to their weight;

[0116] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 17% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions include mechanical stirring at 45°C for 3 hours.

[0117] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0118] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0119] Step 5: The evenly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum are uniformly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum, which is denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 60°C for 30 min, and drying at 85°C for 28 h; the screen mesh size is 100 mesh.

[0120] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0121] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0122] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0123] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0124] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 35℃. After the dropwise addition is complete, add the weighed 3-acetidylpropionate and mechanically stir at 330 r / min for 4.5 h to obtain complex E. The dropwise addition rate is 60 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0125] Step 11: Wash compound E five times with dimethyl methanol, and wait until no more dimethyl methanol evaporates to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0126] Example 2

[0127] This example provides an internal maintenance material suitable for the base course of aeolian sand roads, which, by mass fraction, includes the following raw materials:

[0128] α-Methacrylic acid 25%, γ-polyglutamic acid 12%, sodium amino acid 4%, N-isopropylacrylamide 5%, azobisisobutyramidine hydrochloride 0.3%, potassium dithiooctaoxyate 0.35%, sodium bisulfite 0.15%, expanded perlite powder 12%, magnesium silicate monohydrate 5.5%, hollow glass microspheres 7.5%, nano boron nitride 6%, diatomaceous earth 1.5%, phosphogypsum 3%, dihydroxysuccinic acid 0.8%, vinyltrimethoxysilane 1.5%, carrageenan 2.2%, maltodextrin 0.3%, cellulose ether 0.5%, lauryl alcohol polyoxyethylene ether 0.8%, 805 viscosity modifier 1%, 3-acrylidinylpropionate 0.3%, oil phase material 10.3%.

[0129] Specifically, the oil phase material is cyclohexane and vinylpyrrolidone, and the vinylpyrrolidone has a mass fraction of 2.7% of cyclohexane.

[0130] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0131] The preparation method of the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0132] Step 1: Weigh out the above raw materials according to their weight;

[0133] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 17% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions include mechanical stirring at 45°C for 3 hours.

[0134] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0135] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0136] Step 5: The evenly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum are uniformly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum, which is denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 60°C for 30 min, and drying at 85°C for 28 h; the screen mesh size is 100 mesh.

[0137] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0138] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0139] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0140] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0141] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 35℃. After the dropwise addition is complete, add the weighed 3-acetidylpropionate and mechanically stir at 330 r / min for 4.5 h to obtain complex E. The dropwise addition rate is 60 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0142] Step 11: Wash compound E four times with dimethyl methanol, and after all dimethyl methanol has evaporated, dry it at 40°C for 1.5 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0143] Example 3

[0144] This example provides an internal maintenance material suitable for the base course of aeolian sand roads, which, by mass fraction, includes the following raw materials:

[0145] α-Methacrylic acid 25.5%, γ-polyglutamic acid 12.5%, sodium amide 4.5%, N-isopropylacrylamide 8.13%, azobisisobutyramidine hydrochloride 0.35%, potassium dithiooctaoxyate 0.38%, sodium bisulfite 0.14%, expanded perlite powder 12.6%, magnesium silicate monohydrate 5.5%, hollow glass microspheres 7%, nano boron nitride 6%, diatomaceous earth 1.8%, phosphogypsum 3.2%, dihydroxysuccinic acid 0.7%, vinyltrimethoxysilane 1.5%, carrageenan 2.2%, maltodextrin 0.4%, cellulose ether 0.6%, lauryl alcohol polyoxyethylene ether 0.9%, 805 viscosity modifier 1.2%, 3-acrylidinyl propionate 0.4%, oil phase material 10%.

[0146] Specifically, the oil phase material is cyclohexane and vinylpyrrolidone, and the vinylpyrrolidone is 3% of the mass fraction of cyclohexane.

[0147] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0148] The preparation method of the above-mentioned internal health care material includes the following steps:

[0149] Step 1: Weigh out the above raw materials according to their weight;

[0150] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 17% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions include mechanical stirring at 45°C for 3 hours.

[0151] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0152] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0153] Step 5: The evenly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum are uniformly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum, which is denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 60°C for 30 min, and drying at 85°C for 28 h; the screen mesh size is 100 mesh.

[0154] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0155] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0156] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0157] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0158] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 35℃. After the dropwise addition is complete, add the weighed 3-acetidylpropionate and mechanically stir at 330 r / min for 4.5 h to obtain complex E. The dropwise addition rate is 60 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0159] Step 11: Wash compound E 6 times with dimethyl methanol, and after no more dimethyl methanol evaporates, dry it at 40°C for 1.5 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0160] Example 4

[0161] This example provides an internal maintenance material suitable for the base course of aeolian sand roads, which, by mass fraction, consists of the following raw materials:

[0162] α-Methacrylic acid 25%, γ-polyglutamic acid 12%, sodium amino acid 4%, N-isopropylacrylamide 5.5%, azobisisobutyramidine hydrochloride 0.35%, potassium dithiooctaoxyate 0.38%, sodium bisulfite 0.14%, expanded perlite powder 12%, magnesium silicate monohydrate 5%, hollow glass microspheres 7%, nano boron nitride 6%, diatomaceous earth 1.8%, phosphogypsum 3%, dihydroxysuccinic acid 0.73%, vinyltrimethoxysilane 1.5%, carrageenan 2.2%, maltodextrin 0.4%, cellulose ether 0.5%, lauryl alcohol polyoxyethylene ether 0.5%, 805 viscosity modifier 1.5%, 3-acrylidinyl propionate 0.5%, oil phase material 10%.

[0163] Specifically, the oil phase material is cyclohexane and vinylpyrrolidone, and the vinylpyrrolidone has a mass fraction of 3.5% of cyclohexane.

[0164] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0165] The preparation method of the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0166] Step 1: Weigh out the above raw materials according to their weight;

[0167] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 17% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions include mechanical stirring at 45°C for 3 hours.

[0168] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0169] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0170] Step 5: The evenly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum are uniformly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum, which is denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 60°C for 30 min, and drying at 85°C for 28 h; the screen mesh size is 100 mesh.

[0171] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0172] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0173] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0174] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0175] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 35℃. After the dropwise addition is complete, add the weighed 3-acetidylpropionate and mechanically stir at 330 r / min for 4.5 h to obtain complex E. The dropwise addition rate is 60 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0176] Step 11: Wash compound E five times with dimethyl methanol, and after no more dimethyl methanol has evaporated, dry it at 40°C for 1.5 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0177] Example 5

[0178] This example provides an internal maintenance material suitable for the base course of aeolian sand roads, which, by mass fraction, includes the following raw materials:

[0179] α-Methacrylic acid 25.5%, γ-polyglutamic acid 12%, sodium amino acid 4.2%, N-isopropylacrylamide 5%, azobisisobutyramidine hydrochloride 0.35%, potassium dithiooctaoxyate 0.38%, sodium bisulfite 0.14%, expanded perlite powder 12%, magnesium silicate monohydrate 5.1%, hollow glass microspheres 7.2%, nano boron nitride 6.2%, diatomaceous earth 1.6%, phosphogypsum 3%, dihydroxysuccinic acid 0.61%, vinyltrimethoxysilane 1.5%, carrageenan 2%, maltodextrin 0.45%, cellulose ether 0.55%, lauryl alcohol polyoxyethylene ether 0.8%, 805 viscosity modifier 1.12%, 3-acrylidinylpropionate 0.3%, oil phase material 10%.

[0180] Specifically, the oil phase material is cyclohexane and vinylpyrrolidone, and the vinylpyrrolidone has a mass fraction of 2.5% of cyclohexane.

[0181] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0182] The preparation method of the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0183] Step 1: Weigh out the above raw materials according to their weight;

[0184] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 17% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions include mechanical stirring at 45°C for 3 hours.

[0185] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0186] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0187] Step 5: The evenly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum are uniformly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum, which is denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 60°C for 30 min, and drying at 85°C for 28 h; the screen mesh size is 100 mesh.

[0188] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0189] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0190] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0191] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0192] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 35℃. After the dropwise addition is complete, add the weighed 3-acrylidinylpropionate and mechanically stir at 330 r / min for 4.5 h to obtain complex E. The dropwise addition rate is 60 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0193] Step 11: Wash compound E 6 times with dimethyl methanol, and after no more dimethyl methanol evaporates, dry it at 40°C for 1.5 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0194] Example 6

[0195] This example provides an internal maintenance material suitable for the base course of aeolian sand roads, which, by mass fraction, includes the following raw materials:

[0196] α-Methacrylic acid 25.2%, γ-polyglutamic acid 12.1%, sodium amino acid 4.2%, N-isopropylacrylamide 5%, azobisisobutyramidine hydrochloride 0.2%, potassium dithiooctaoxyate 0.33%, sodium bisulfite 0.12%, expanded perlite powder 12.5%, magnesium silicate monohydrate 5.3%, hollow glass microspheres 7%, nano boron nitride 6%, diatomaceous earth 1.5%, phosphogypsum 3%, dihydroxysuccinic acid 0.55%, vinyltrimethoxysilane 1.5%, carrageenan 2%, maltodextrin 0.3%, cellulose ether 0.55%, lauryl alcohol polyoxyethylene ether 0.9%, 805 viscosity modifier 1%, 3-acrylidinyl propionate 0.35%, oil phase material 10.4%.

[0197] Specifically, the oil phase material is cyclohexane and vinylpyrrolidone, and the vinylpyrrolidone is 3% of the mass fraction of cyclohexane.

[0198] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0199] The preparation method of the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0200] Step 1: Weigh out the above raw materials according to their weight;

[0201] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 17% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions include mechanical stirring at 45°C for 3 hours.

[0202] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0203] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0204] Step 5: The evenly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum are uniformly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum, which is denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 60°C for 30 min, and drying at 85°C for 28 h; the screen mesh size is 100 mesh.

[0205] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0206] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0207] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0208] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0209] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 35℃. After the dropwise addition is complete, add the weighed 3-acetidylpropionate and mechanically stir at 330 r / min for 4.5 h to obtain complex E. The dropwise addition rate is 60 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0210] Step 11: Wash compound E four times with dimethyl methanol, and after all dimethyl methanol has evaporated, dry it at 40°C for 1.5 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0211] Example 7

[0212] This example provides an internal maintenance material suitable for the base course of aeolian sand roads, which, by mass fraction, includes the following raw materials:

[0213] α-Methacrylic acid 26.5%, γ-polyglutamic acid 13%, sodium amino acid 5%, N-isopropylacrylamide 12.5%, azobisisobutyramidine hydrochloride 0.3%, potassium dithiooctaoxyate 0.35%, sodium bisulfite 0.15%, expanded perlite powder 14%, magnesium silicate monohydrate 6%, hollow glass microspheres 7.5%, nano boron nitride 7.5%, diatomaceous earth 2%, phosphogypsum 4%, dihydroxysuccinic acid 0.75%, vinyltrimethoxysilane 1.75%, carrageenan 2.5%, maltodextrin 0.4%, cellulose ether 0.65%, lauryl alcohol polyoxyethylene ether 0.9%, 805 viscosity modifier 1.25%, 3-acrylidinyl propionate 0.45%, oil phase material 10.5%.

[0214] In the oil phase material, vinylpyrrolidone accounts for 3% of the mass of cyclohexane.

[0215] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0216] The preparation method of the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0217] Step 1: Weigh out the above raw materials according to their weight;

[0218] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a dilute solution with a mass concentration of 18.5%. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions specifically include mechanical stirring at 50°C for 3.5 hours.

[0219] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0220] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane;

[0221] Step 5: The evenly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano-boron nitride, diatomaceous earth, and phosphogypsum are uniformly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano-boron nitride, diatomaceous earth, and phosphogypsum, denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 70°C for 35 min, and drying at 90°C for 28.3 h; the screen mesh size is 110 mesh.

[0222] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 8%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0223] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0224] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0225] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 290 r / min for 27 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 320 r / min for 26 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0226] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 40℃. After the dropwise addition is complete, add the weighed 3-acrylidinylpropionate and mechanically stir at 340 r / min for 4.7 h to obtain complex E. The dropwise addition rate is 90 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0227] Step 11: Wash compound E four times with dimethyl methanol, and after no more dimethyl methanol has evaporated, dry it at 40°C for 1.7 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0228] Example 8

[0229] This example provides an internal maintenance material suitable for the base course of aeolian sand roads, which, by mass fraction, includes the following raw materials:

[0230] α-Methacrylic acid 28%, γ-polyglutamic acid 14%, sodium amino acid 6%, N-isopropylacrylamide 20%, azobisisobutyramidine hydrochloride 0.4%, potassium dithiooctaoxyate 0.4%, sodium bisulfite 0.2%, expanded perlite powder 16%, magnesium silicate monohydrate 7%, hollow glass microspheres 8%, nano boron nitride 9%, diatomaceous earth 2.5%, phosphogypsum 5%, dihydroxysuccinic acid 1%, vinyltrimethoxysilane 2%, carrageenan 3%, maltodextrin 0.5%, cellulose ether 0.8%, lauryl alcohol polyoxyethylene ether 1.0%, 805 viscosity modifier 1.5%, 3-acrylidinyl propionate 0.6%, oil phase material 11%.

[0231] In the oil phase material, vinylpyrrolidone accounts for 3.5% of the mass of cyclohexane.

[0232] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0233] The preparation method of the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0234] Step 1: Weigh out the above raw materials according to their weight;

[0235] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 20% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions specifically include mechanical stirring at 55°C for 4 hours.

[0236] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0237] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0238] Step 5: The uniformly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano-boron nitride, diatomaceous earth, and phosphogypsum are evenly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano-boron nitride, diatomaceous earth, and phosphogypsum, denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 80°C for 40 min, and drying at 90°C for 28.5 h; the screen mesh size is 120 mesh.

[0239] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 9%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0240] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0241] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0242] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 300 r / min for 30 min in a constant temperature water bath at 50°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 330 r / min for 28 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0243] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 45℃. After the dropwise addition is complete, add the weighed 3-acetidylpropionate and mechanically stir at 350 r / min for 5 h to obtain complex E. The dropwise addition rate is 120 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0244] Step 11: Wash compound E 6 times with dimethyl methanol, and after no more dimethyl methanol evaporates, dry it at 40°C for 2 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0245] Comparative Example 1

[0246] The difference between Comparative Example 1 and the Example is that Comparative Example 1 does not contain nano boron nitride or maltodextrin, and the composition ratio is also different.

[0247] Comparative Example 1 presents an internal maintenance material suitable for the base course of aeolian sand roads, comprising the following raw materials by mass fraction:

[0248] α-Methacrylic acid 26.5%, γ-polyglutamic acid 12.5%, sodium amide 4.5%, N-isopropylacrylamide 8%, azobisisobutyramidine hydrochloride 0.2%, potassium dithiooctaoxyate 0.33%, sodium bisulfite 0.12%, expanded perlite powder 12.5%, magnesium silicate monohydrate 5.8%, hollow glass microspheres 7%, diatomaceous earth 1.5%, phosphogypsum 3%, dihydroxysuccinic acid 0.55%, vinyltrimethoxysilane 1.5%, carrageenan 2.3%, cellulose ether 0.55%, lauryl alcohol polyoxyethylene ether 0.9%, 805 viscosity modifier 1%, 3-acrylidinylpropionate 0.35%, oil phase material 10.9%.

[0249] Specifically, the oil phase material is cyclohexane and vinylpyrrolidone, and the vinylpyrrolidone has a mass fraction of 2.5% of cyclohexane.

[0250] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0251] The preparation method of the above-mentioned internal health care material includes the following steps:

[0252] Step 1: Weigh out the above raw materials according to their weight;

[0253] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 17% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions include mechanical stirring at 45°C for 3 hours.

[0254] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, diatomaceous earth and phosphogypsum evenly and set aside.

[0255] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0256] Step 5: The evenly mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum are uniformly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, diatomaceous earth, and phosphogypsum, which is denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 60°C for 30 min, and drying at 85°C for 28 h; the screen mesh size is 100 mesh.

[0257] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0258] Step 7: Add carrageenan, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0259] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0260] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0261] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 35℃~45℃. After the dropwise addition is complete, add the weighed 3-acetidylpropionate and mechanically stir at 330 r / min for 4.5 h to obtain complex E. The dropwise addition rate is 60 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0262] Step 11: Wash compound E five times with dimethyl methanol, and after no more dimethyl methanol has evaporated, dry it at 40°C for 1.5 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0263] Comparative Example 2

[0264] The difference between Comparative Example 2 and the Example is that Comparative Example 2 does not contain hollow glass beads, and the composition ratio is also different.

[0265] This comparative example presents an internal maintenance material suitable for the base course of aeolian sand roads, comprising the following raw materials by mass fraction:

[0266] α-Methacrylic acid 27%, γ-polyglutamic acid 12.5%, sodium amide 4.5%, N-isopropylacrylamide 9.3%, azobisisobutyramidine hydrochloride 0.35%, potassium dithiooctaoxyate 0.38%, sodium bisulfite 0.14%, expanded perlite powder 12%, magnesium silicate monohydrate 5%, nano boron nitride 6%, diatomaceous earth 1.8%, phosphogypsum 3.2%, dihydroxysuccinic acid 0.73%, vinyltrimethoxysilane 1.5%, carrageenan 2.7%, maltodextrin 0.4%, lauryl alcohol polyoxyethylene ether 0.5%, 805 viscosity modifier 1.5%, 3-acrylidinyl propionate 0.5%, oil phase material 10%.

[0267] Specifically, the oil phase material is cyclohexane and vinylpyrrolidone, and the vinylpyrrolidone has a mass fraction of 2.5% of cyclohexane.

[0268] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0269] The preparation method of the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0270] Step 1: Weigh out the above raw materials according to their weight;

[0271] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 17% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions include mechanical stirring at 45°C for 3 hours.

[0272] Step 3: Mix the weighed expanded perlite, magnesium silicate monohydrate, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0273] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0274] Step 5: The uniformly mixed expanded perlite, magnesium silicate monohydrate, nano boron nitride, diatomaceous earth, and phosphogypsum are evenly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified expanded perlite, magnesium silicate monohydrate, nano boron nitride, diatomaceous earth, and phosphogypsum, denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 60°C for 30 min, and drying at 85°C for 28 h; the screen mesh size is 100 mesh.

[0275] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0276] Step 7: Add carrageenan, maltodextrin, and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0277] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0278] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0279] Step 10: Add mixture A and 805 viscosity modifier dropwise to mixture D, maintaining the temperature at 35℃. After the dropwise addition is complete, add the weighed 3-acetidylpropionate and mechanically stir at 330 r / min for 4.5 h to obtain complex E. The dropwise addition rate is 60 drops / min, and the total dropwise addition time does not exceed 100 minutes.

[0280] Step 11: Wash compound E four times with dimethyl methanol, and after all dimethyl methanol has evaporated, dry it at 40°C for 1.5 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0281] Comparative Example 3

[0282] The difference between this Comparative Example 3 and the above embodiments is that the Comparative Example does not contain expanded perlite powder, and the composition ratio is also different.

[0283] This comparative example presents an internal maintenance material suitable for the base course of aeolian sand roads, comprising the following raw materials by mass fraction:

[0284] The composition includes 27% α-methacrylic acid, 13% γ-polyglutamic acid, 6% sodium amino acid, 10.7% N-isopropylacrylamide, 0.4% azobisisobutyramidine hydrochloride, 0.38% potassium dithiooctaoxyate, 0.14% sodium bisulfite, 6% magnesium silicate monohydrate, 7.5% hollow glass microspheres, 6.2% nano boron nitride, 1.8% diatomaceous earth, 3.2% phosphogypsum, 0.71% dihydroxysuccinic acid, 1.5% vinyltrimethoxysilane, 3% carrageenan, 0.45% maltodextrin, 0.55% cellulose ether, 0.8% lauryl alcohol polyoxyethylene ether, 0.5% 3-acrylidinyl propionate, and 10.8% oil phase material.

[0285] Specifically, the oil phase material is cyclohexane and vinylpyrrolidone, and the vinylpyrrolidone is 3% of the mass fraction of cyclohexane.

[0286] Specifically, anhydrous ethanol, deionized water, and dimethyl methanol are used as solvents to prepare solutions or wash raw materials, and do not participate in chemical reactions.

[0287] The preparation method of the above-mentioned internal maintenance material suitable for the base course of wind-blown sand roads includes the following steps:

[0288] Step 1: Weigh out the above raw materials according to their weight;

[0289] Step 2: Add γ-polyglutamic acid and α-methacrylic acid to deionized water to prepare a 17% (w / w) dilute solution. Add the weighed sodium amino acid and cool to room temperature. Then, add the weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate, and sodium bisulfite in sequence and stir until homogeneous to obtain mixture A. The stirring conditions include mechanical stirring at 45°C for 3 hours.

[0290] Step 3: Mix the weighed magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum evenly and set aside.

[0291] Step 4: Hydrolyze vinyltrimethoxysilane in the presence of dihydroxysuccinic acid, and add a certain amount of a mixture of deionized water and anhydrous ethanol, wherein m 乙烯基三甲氧基硅烷 :m 二羟基琥珀酸 =1:1.5, m 无水乙醇和去离子水 :m 二羟基琥珀酸 :m 乙烯基三甲氧基硅烷 =14:3:1, forming a hydrolysate of vinyltrimethoxysilane.

[0292] Step 5: The uniformly mixed magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum are evenly dispersed in the hydrolysate of vinyltrimethoxysilane from Step 4. Argon gas is passed through for stirring, and then the mixture is allowed to stand for a period of time until it separates into layers. The mixture is then filtered through a screen, and the remaining moist mixture is dried to obtain the modified magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum, denoted as mixture B. The stirring and drying processes are as follows: magnetic stirring at 60°C for 30 min, and drying at 85°C for 28 h; the screen mesh size is 100 mesh.

[0293] Step 6: Add mixture B to deionized water and stir until homogeneous to prepare a suspension with a mass concentration of 7%. Stir magnetically for 25 minutes and record this as the suspension of mixture B.

[0294] Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether to deionized water and stir well to prepare a 2% (w / w) dilute solution.

[0295] Step 8: Add polyvinylpyrrolidone to cyclohexane, stir with argon gas until homogeneous, and mechanically stir at 180 r / min for 25 min in a constant temperature water bath at 40℃ to form oil phase C;

[0296] Step 9: Slowly add the pre-prepared dilute solution of carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to the oil phase C, stir evenly with argon gas, and mechanically stir at 280 r / min for 25 min in a constant temperature water bath at 40°C. While continuously stirring, add the suspension of mixture B and mechanically stir at 300 r / min for 25 min to obtain mixture D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixture D is 1:5:16.

[0297] Step 10: Add mixture A dropwise to mixture D, maintaining the temperature at 35℃. After the addition is complete, add the weighed 3-acrylidinylpropionate and stir mechanically at 330 r / min for 4.5 h to obtain complex E. The dropping rate is 60 drops / min, and the total dropping time does not exceed 100 minutes.

[0298] Step 11: Wash compound E several times with dimethyl methanol, and after no more dimethyl methanol evaporates, dry it at 40°C for 1.5 hours to obtain an internal maintenance material suitable for the base course of wind-blown sand roads.

[0299] Performance testing

[0300] When using, directly add the internal curing material suitable for aeolian sand road base courses to the mixing equipment along with the cement-based materials for mixing, referring to GB / T8077-2023 "Test Method for Homogeneity of Concrete Admixtures", GB 8076-2008 "Concrete Admixtures", JC901-2002 "Cement Concrete Curing Agents", JT / T522-2022 "Cement Concrete Curing Agents (Films) for Highway Engineering", DB 61 / T 1428-2021 "Technical Specification for Construction of Cement Stabilized Aeolian Sand Road Base Courses" and JTG In accordance with the requirements of 3441-2024 "Test Procedures for Inorganic Binder Stabilized Materials for Highway Engineering", the unconfined compressive strength, shrinkage rate, cement paste fluidity, and molecular weight were tested separately for internal curing materials incorporated into and without internal curing materials suitable for aeolian sand road bases. The shrinkage ratio after 28 days was calculated. The dosage of internal curing material suitable for aeolian sand road bases was 0.2% of the cement mass. The specific performance indicators are shown in the following table and chart.

[0301] like Figure 1As shown, γ-polyglutamic acid, α-methacrylic acid, and N-isopropylacrylamide continuously crosslink and copolymerize with carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to form a semi-interpenetrating network structure. The components are uniformly dispersed, with a relatively smooth surface and no obvious agglomeration, thus providing the resin with swelling capacity. The synthesized internal maintenance material suitable for aeolian sand road base has a rough surface with numerous wrinkles, protrusions, and pores, and also exhibits a certain degree of layered structure. This increases the specific surface area of ​​the internal maintenance material suitable for aeolian sand road base, making it easier for water molecules to diffuse into its three-dimensional network structure, thereby improving the water absorption and retention performance of the internal maintenance material.

[0302] from Figure 2 As can be seen from the various embodiments, adding internal curing materials to cement significantly reduces the fluidity of cement paste compared to the control group (without internal curing materials). The molecular weight of the self-curing agent first decreases, then increases, and then decreases again. In the six embodiments, the fluidity and molecular weight of cement paste increased and decreased respectively compared to the comparative example, indicating that changes in the composition ratio of raw materials affect the molecular weight of the polymer during synthesis, and the proportion of the target product changes, resulting in varying tackifying and water-retaining properties of the synthesized material. Internal curing materials with tackifying effects can be adsorbed onto the surface of cement particles. When the dosage is appropriate, it can make the surface of cement particles carry the same charge, thereby generating electrostatic repulsion, preventing cement particles from agglomerating, and improving the fluidity of cement paste. However, with the increase of the dosage of internal curing materials, due to their high viscosity and strong interaction with water, the fluidity of cement paste gradually decreases.

[0303] Depend on Figure 3 and Figure 4 It can be seen that the 7-day unconfined compressive strength and indirect tensile strength of the six sets of examples and the three sets of control examples continuously decreased with the change of raw material composition ratio, but their strengths all met the specification value of 5 MPa. This is because the internal curing material absorbed a large amount of free water before 7 days, resulting in a reduction in the effective water participating in hydration. At the same time, after the internal curing material absorbed water and swelled, it formed pores inside the material, resulting in a decrease in the density of the internal structure of the specimen, so the 7-day strength of the specimen was reduced. The 14-day, 28-day, and 60-day unconfined compressive strength and indirect tensile strength of the six sets of examples were all higher than those of the three sets of control examples. The highest unconfined compressive strength reached 14%, 18%, and 22%, respectively, and the highest indirect tensile strength reached 18%, 10%, and 7%, respectively.

[0304] Depend on Figure 5It can be seen that the shrinkage rate of the six sets of examples after 28 days was lower than that of the three comparative sets, with a maximum reduction of 24%, showing a significant effect. This indicates that the absence of materials or changes in the mix ratio significantly affect the curing effect of this internal curing material. Therefore, this internal curing material not only plays a good role in increasing adhesion and strengthening, but also greatly reduces the autogenous shrinkage of concrete. It also has good applicability and can effectively solve the problems existing in the current maintenance process of aeolian sand road engineering, showing broad application prospects.

[0305] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An internal maintenance material suitable for the base course of wind-blown sand roads, characterized in that, By weight fraction, it includes the following raw materials: α-Methacrylic acid 25%~28%; γ-polyglutamic acid 12%~14%; N-Isopropylacrylamide 5%~20%; Carrageenan 2%~3%; Maltodextrin 0.3%~0.5%; Cellulose ethers: 0.5%~0.8%; Lauryl alcohol polyoxyethylene ether 0.8%~1.0%; Expanded perlite powder 12%~16%; Viscosity modifier 1%~1.5%; Oil phase materials: 10%~11%; Auxiliary materials account for 29.4% to 42.1%.

2. The internal maintenance material for road base courses made of aeolian sand as described in claim 1, characterized in that, The oil phase material includes cyclohexane and polyvinylpyrrolidone, wherein the polyvinylpyrrolidone has a mass fraction of 2.5% to 3.5% of cyclohexane.

3. The internal maintenance material for road base courses made of aeolian sand as described in claim 1, characterized in that, The viscosity modifier is 805 viscosity modifier.

4. The internal maintenance material for road base courses made of aeolian sand as described in claim 1, characterized in that, The auxiliary materials include sodium amide 4%~6%, azobisisobutyramidine hydrochloride 0.2%~0.4%, potassium dithiooctaoxyate 0.3%~0.4%, sodium bisulfite 0.1%~0.2%, magnesium silicate monohydrate 5%~7%, hollow glass microspheres 7%~8%, nano boron nitride 6%~9%, diatomaceous earth 1.5%~2.5%, phosphogypsum 3%~5%, dihydroxysuccinic acid 0.5%~1%, vinyltrimethoxysilane 1.5%~2%, and 3-acrylidinylpropionate 0.3%~0.6%.

5. A method for preparing an internal maintenance material suitable for the base course of wind-blown sand roads according to any one of claims 1 to 4, characterized in that, Includes the following steps: Weigh each raw material according to the above mass fraction; Prepare a dilute solution of γ-polyglutamic acid and α-methacrylic acid, add weighed sodium amino acid and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctaoxyate and sodium bisulfite in sequence, and stir to obtain mixture A; The mixture of expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomite and phosphogypsum was modified to obtain mixture B. Mixture B was prepared into a suspension and denoted as the suspension of mixture B. Polyvinylpyrrolidone is added to cyclohexane, argon gas is introduced, and after mixing, an oil phase material C is formed; A dilute solution composed of carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether was added to the oil phase C, and argon gas was introduced and stirred. After adding the suspension of mixture B, the mixture D was obtained by stirring. Mixture A and viscosity modifier 805 are mixed with mixture D, and 3-acrylidylpropionate is added. After mixing, complex E is obtained. After washing complex E, an internal maintenance material suitable for the base course of wind-blown sand roads is obtained.

6. The method for preparing an internal maintenance material suitable for the base course of wind-blown sand roads according to claim 5, characterized in that, In the preparation of mixture D, the volume ratio of the dilute solution, oil phase C, and mixture B suspension is 1:5:

16.

7. A method for preparing an internal maintenance material suitable for the base course of wind-blown sand roads according to claim 5, characterized in that, The mass concentration of the dilute solution composed of carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether is 2% to 3%.

8. A method for preparing an internal maintenance material suitable for the base course of wind-blown sand roads according to claim 5, characterized in that, Expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth, and phosphogypsum were modified using a hydrolysate of vinyltrimethoxysilane.

9. A method for preparing an internal maintenance material suitable for the base course of wind-blown sand roads according to claim 8, characterized in that, The method for preparing the hydrolysate of vinyltrimethoxysilane includes mixing vinyltrimethoxysilane with dihydroxysuccinic acid, adding a mixture of deionized water and anhydrous ethanol to obtain the hydrolysate of vinyltrimethoxysilane; the mass ratio of the mixture of anhydrous ethanol and deionized water, dihydroxysuccinic acid and vinyltrimethoxysilane is 14:3:

1.

10. The application of the internal maintenance material for aeolian sand road base as described in claim 1 in aeolian sand road base.

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