Internal maintenance material suitable for aeolian sand road base as well as preparation method and application of internal maintenance material

Abstract

The invention provides an internal maintenance material suitable for an aeolian sand road base as well as a preparation method and application of the internal maintenance material, and belongs to the technical field of road engineering. The invention comprises the following raw materials: 25%-28% of alpha-methacrylic acid; 12%-14% of gamma-polyglutamic acid; 5% to 20% of N-isopropylacrylamide; 2%-3% of carrageenan; 0.3% to 0.5% of maltodextrin; 0.5%-0.8% of cellulose ether; 0.8%-1.0% of polyoxyethylene lauryl ether; 12%-16% of expanded perlite powder; 1%-1.5% of a viscosity modifier; 10%-11% of an oil phase material; and 29.4%-42.1% of an auxiliary material. The internal curing material suitable for the aeolian sand road base has a bonding effect, has water absorption-water retention-water release performance, can increase the bonding force between the super absorbent 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] The invention belongs to the technical field of road engineering, and in particular relates to an internal maintenance material suitable for a wind-blown sand road base, and a preparation method and application thereof. Background Art

[0002] When building roads in desert areas, high-quality fillers are extremely scarce. In addition, the population is sparse, logistics supply is difficult, and it is very difficult to transport road construction materials over long distances, which greatly increases the cost of the project. Due to the abundant reserves of aeolian sand, small settlement deformation, loose particles, low cohesion, low natural moisture content, high water permeability, and poor water retention, it has the characteristics of high density in both the natural state and the optimal moisture content; therefore, highway construction can follow the principle of using local materials and make full use of aeolian sand to replace other fine aggregates as road construction materials, so that its strength and stability can reach the semi-rigid base construction standards. Aeolian sand, as a special road construction material, has a very rich reserve in desert areas. It is the most important basic material for building roads in desert areas and the best choice for building roads. The use of aeolian sand in highway construction in desert areas has the advantages of low consumption, low emissions, low pollution, high efficiency, high efficiency, and high benefits.

[0003] Although aeolian sand road materials have outstanding advantages, they also have some shortcomings. For example, the application of aeolian sand is less or the pavement cracking caused by the thermal shrinkage and dry shrinkage deformation of the semi-rigid base in desert areas is not considered. At the same time, the monitoring and research on the stability of roads in seasonally frozen areas is mostly focused on the roadbed, and there is less research on the overall structure of roads in desert areas. There are few studies on the strength characteristics, mechanical properties, and road performance of cement-stabilized graded gravel mixtures mixed with aeolian sand. As a result, whether it is feasible to use aeolian sand as a substitute filler in cement-stabilized graded gravel mixtures in physical projects, and the upper limit of the amount of aeolian sand used for cement-stabilized graded gravel, etc., remain to be solved. Some scholars have explored the effects of different aeolian sand content and super absorbent resin (SAP) content on the strength characteristics and durability of cement-stabilized graded gravel mixtures. Related studies have also shown that adding a certain amount of fly ash active powder as a binder can improve the crack resistance of the base.

[0004] In response to the problems of reflective cracks and poor adhesion of the pavement of aeolian sand roads, many studies currently believe that the newly paved aeolian sand roads can be internally maintained with the help of internal curing materials, which can effectively alleviate the problems of drying shrinkage cracks and poor cohesion in the base layer, and can steadily increase its strength in the later stage. However, the existing commercially available internal curing materials are in a gel state after absorbing liquid and swelling in the aeolian sand road, but have poor or almost no viscosity and low strength. Under the action of external or wheel loads, the aeolian sand road will have horizontal and vertical cracks, collapse, and looseness; and the internal curing gel inside will have structural ruptures, leading to problems such as premature release of internal moisture, thereby reducing the performance of the aeolian sand road and weakening the curing efficiency of the internal curing materials.

[0005] Chinese patent CN113461363B discloses a rolling-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, the internal curing material has poor or almost no viscosity and low strength. Under the action of external or wheel loads, horizontal and vertical cracks, collapse, and looseness will appear inside the aeolian sand road. Summary of the invention

[0006] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an internal maintenance material and a preparation method and application thereof, so as to solve the technical problem of poor viscosity of the internal maintenance material suitable for the wind-blown sand road base in the prior art.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides an internal maintenance material suitable for a wind-blown sand road base, which comprises the following raw materials by mass fraction: 25% to 28% of α-methacrylic acid; γ-polyglutamic acid 12%~14%; N-isopropyl acrylamide 5%~20%; Carrageenan 2%~3%; Maltodextrin 0.3%~0.5%; Cellulose ether 0.5%~0.8%; Lauryl alcohol polyoxyethylene ether 0.8%~1.0%; Expanded perlite powder 12%~16%; Viscosity modifier: 1%~1.5%; 805 viscosity modifier Oil phase material: 10%~11%: Auxiliary materials: 29.4%~42.1%.

[0008] Preferably, the oil phase material comprises cyclohexane and polyvinyl pyrrolidone, wherein the mass fraction of polyvinyl pyrrolidone is 2.5% to 3.5% of the mass fraction of cyclohexane.

[0009] Preferably, the viscosity modifier is 805 viscosity modifier.

[0010] Preferably, the auxiliary materials include sodium amide 4%~6%, azobisisobutylamidine hydrochloride 0.2%~0.4%, potassium dithiooctadecanoate 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-aziridinyl propionate 0.3%~0.6%.

[0011] The present invention also provides a method for preparing the internal maintenance material suitable for aeolian sand road base, comprising the following steps: Weigh each raw material according to the above mass fraction; γ-polyglutamic acid and α-methacrylic acid are added to deionized water to prepare a dilute solution with a mass concentration of 17% to 20%, and sodium amide is added and cooled to room temperature, and then N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite are added in sequence, and the mixture is stirred to obtain a mixture A; The mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum are modified to obtain a mixture B, the mixture B is added into deionized water and stirred evenly to prepare a suspension with a mass concentration of 7% to 9%, and magnetically stirred for 25 minutes, which is recorded as a suspension of the mixture B; Add polyvinyl pyrrolidone to cyclohexane, introduce argon gas and stir evenly to form oil phase material C; Slowly add the pre-prepared dilute solution consisting of carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into the oil phase C, stir evenly with argon, add the suspension of the mixture B under continuous stirring, and obtain a mixed solution D by stirring; Mixture A and 805 viscosity regulator are mixed with mixed liquid D, the temperature is maintained at 35°C~45°C, 3-aziridinyl propionate is weighed and added, and the mixture is mechanically stirred at a speed of 330~350r / min for 4.5h~5h to obtain a composite E; after washing the composite E several times, an internal maintenance material suitable for aeolian sand road base is obtained.

[0012] More preferably, γ-polyglutamic acid and α-methacrylic acid are prepared into a dilute solution with a mass concentration of 17%.

[0013] Further preferably, the mixture B is prepared into a suspension with a mass concentration of 7% to 9%.

[0014] Further preferably, in the method for preparing mixture A, the stirring conditions specifically include: mechanical stirring at 45° C. to 55° C. for 3 to 4 hours.

[0015] Further preferably, in the preparation method of the oil phase material C, after introducing argon gas, the oil phase material C is formed by mechanical stirring at a rotation speed of 180 r / min~210 r / min for 25 min~30 min in a constant temperature water bath environment of 40°C~60°C.

[0016] Further preferably, in the preparation method of mixed liquid D, the stirring conditions after the introduction of argon are: mechanical stirring at a speed of 280r / min~300r / min for 25 min~30min in a constant temperature water bath environment of 40℃~50℃; the stirring conditions after adding the suspension of mixture B are: mechanical stirring at a speed of 300r / min~330r / min for 25min~28min.

[0017] Preferably, during the preparation of the mixed solution D, the volume ratio of the dilute solution, the oil phase C and the suspension of the mixture B is 1:5:16.

[0018] 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 into deionized water and stirring evenly.

[0019] Further preferably, the mass concentration of the dilute solution consisting of carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether is 2%.

[0020] Preferably, the modification process comprises: uniformly mixing the mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum in a hydrolyzate of vinyltrimethoxysilane, stirring with argon gas, and then standing for a period of time to allow stratification, filtering with a filter screen, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; Further preferably, in the preparation method of mixture B, stirring and drying are specifically: magnetic stirring at 60°C to 80°C for 30 to 40 minutes, drying at 85°C to 95°C for 28 to 28.5 hours, and the mesh size of the filter is 100 to 120 meshes.

[0021] Further preferably, the stirring and drying conditions include: magnetic stirring at 60° C. for 30 min, drying at 85° C. for 28 h, and the filter screen has a mesh size of 100.

[0022] Preferably, the preparation method of the above-mentioned hydrolyzate of vinyltrimethoxysilane includes mixing vinyltrimethoxysilane with dihydroxysuccinic acid, hydrolyzing vinyltrimethoxysilane under the action of dihydroxysuccinic acid, adding a certain amount of a mixed solution of deionized water and anhydrous ethanol to obtain a hydrolyzate of vinyltrimethoxysilane; the mass ratio of the mixed solution of anhydrous ethanol and deionized water, dihydroxysuccinic acid and vinyltrimethoxysilane is 14:3:1.

[0023] More preferably, the mixture A and the 805 viscosity regulator are mixed with the mixed solution D by dropwise addition, the dropwise addition speed is 60 to 120 drops / minute, and the total dropwise addition time does not exceed 100 minutes.

[0024] The above technical solution can ensure sufficient reaction and uniform mixing between the mixture A and the 805 viscosity regulator and the mixed liquid D by controlling the dripping speed and the total dripping time, thereby avoiding uneven performance caused by excessively high or low local concentrations.

[0025] More preferably, the composite E is washed with dimethyl methanol for 4 to 6 times, and after no more dimethyl methanol evaporates, it is dried at 40° C. for 1.5 h to 2 h.

[0026] The above technical solution uses dimethyl methanol to clean the complex E to remove unreacted raw materials and impurities, thereby improving the purity and performance of the final material.

[0027] The present invention also provides the use of the internal maintenance material suitable for aeolian sand road base in aeolian sand road base.

[0028] Compared with the prior art, the present invention has the following beneficial effects: The invention provides an internal curing material suitable for a wind-blown sand road base, which has a bonding effect and strong water absorption, water retention and water release performance. On the basis of ensuring the internal curing efficiency of a wind-blown sand road project, the bonding force between highly absorbent resin and cement and aggregate can be increased. The γ-polyglutamic acid in the raw materials of the internal maintenance material suitable for the base of the aeolian sand road is an excellent environmentally friendly polymer material, which can be used as a water-retaining agent and an adsorbent, and its degradation product is pollution-free glutamic acid; γ-polyglutamic acid, α-methacrylic acid, and N-isopropylacrylamide are continuously cross-linked and copolymerized with carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to form an interpenetrating network structure. In this process, the viscous components carrageenan and cellulose ether are grafted on the side chains, and the expanded perlite powder is continuously filled, which not only makes the internal maintenance material have adhesion and elasticity, but also significantly improves its liquid absorption rate. In addition, the excellent liquid storage effect can effectively adjust the humidity distribution inside the aeolian sand road to a certain extent, and ensure the water demand of the road during the maintenance process. Therefore, the internal maintenance material prepared by the present invention has a great contribution to the shrinkage, working performance, mechanical properties, durability and service life of the aeolian sand road, and solves the technical problem of poor viscosity of the internal maintenance material in the prior art.

[0029] Furthermore, in the oil phase material, cyclohexane is used as a solvent and polyvinyl pyrrolidone is used as a thickener and stabilizer. Their combination can form a stable oil phase system, which is conducive to the uniform dispersion and mixing of other ingredients, thereby improving the overall performance of the material.

[0030] Furthermore, the viscosity regulator is 805 viscosity regulator, which helps to adjust the viscosity of the material so that it has suitable fluidity and is easy to construct and apply.

[0031] Furthermore, among the auxiliary materials, sodium amide is used to adjust the pH value of the solution, azobisisobutylamidine hydrochloride is used as an initiator, and magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum can be modified to significantly improve the strength and durability of the material. Expanded perlite, magnesium silicate monohydrate, diatomaceous earth and phosphogypsum have the characteristics of high porosity, nanopore size and low density. These three components not only have moderate hardness, but can also be used as filling materials for internal curing materials to provide a rigid skeleton structure. The uniform and fine pores on the surface provide attachment points for organic monomers to compound, increase the interpenetrating network structure formed by the three-dimensional network structure and cross-linked copolymerization to cross-link and form a complex gel bonding interface. This gel has a large network space, good elasticity and viscosity, and a strong ability to wrap water, making it difficult to exude water. Magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride and diatomaceous earth are all inorganic amorphous hard particle powders with stable chemical properties, acid and alkali resistance, chemical inertness, and low expansion coefficient. They are used as auxiliary materials and filling materials for the rigid skeleton of internal curing materials. They can significantly enhance the rigidity of the internal curing microspheres and ensure that the internal curing materials will not break, release water, and other adverse phenomena due to wheel loads during the application of semi-rigid base layers. Due to the strong permeability and water absorption of diatomaceous earth, the synthetic internal curing microsphere material retains a large amount of moisture, and the water absorption rate is greatly improved. The internal maintenance material of the present invention becomes sticky after swelling due to liquid absorption, and adheres to the interface of cement and aggregate. After a certain period of time, the moisture inside the material is slowly released under the action of osmotic pressure, which can prevent the evaporation and loss of moisture in the aeolian sand road, control and reduce the shrinkage of the base layer, and ensure 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 maintenance material, which has a certain auxiliary effect on the aeolian sand road project to resist shrinkage, bending, deformation and fracture during the application process. Generally, the internal maintenance material will leave holes inside the base layer after releasing water, and the presence of expanded perlite powder and phosphogypsum powder just makes up for this defect. Under the action of external environment and wheel load, the internal curing gel of the internal curing material of the present invention maintains structural integrity and will not crack, thereby avoiding the occurrence of problems such as drying shrinkage, temperature shrinkage, poor cohesion, wrapping, segregation and water seepage, reducing the expansion of internal reflective cracks in the aeolian sand road base, improving the working performance, mechanical properties, strength and durability of the aeolian sand road base, effectively ensuring the quality and service life of the aeolian sand road project, reducing the subsequent maintenance costs, and having important value in promoting the high performance of the aeolian sand base and improving the production and application technology of the aeolian sand road project.

[0032] The present invention also discloses a method for preparing the internal curing material. The entire preparation process is relatively simple and does not require the operation guidance of professional technicians. It only needs to be carried out according to the description of the present invention.

[0033] Furthermore, the volume ratio of the dilute solution, oil phase C, and suspension of mixture B was determined, which is crucial to controlling the performance and stability of the final product. By adjusting the ratio of these components, the strength, stability, and biocompatibility of the internal curing material can be further optimized.

[0034] Furthermore, the dilute solutions of carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether have appropriate concentrations, which is conducive to their uniform dispersion and reaction during subsequent processing, thereby improving the properties of the final material.

[0035] Furthermore, by modifying the inorganic filler with the hydrolyzate of vinyltrimethoxysilane, the interaction between the filler and the polymer matrix can be enhanced, 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 to avoid the occurrence of agglomeration.

[0036] Furthermore, the hydrolysis process of vinyl trimethoxysilane under the action of dihydroxysuccinic acid helps to form a stable silane hydrolyzate, which is crucial for subsequent material modification. At the same time, adding a mixture of deionized water and anhydrous ethanol can further adjust the viscosity and stability of the hydrolyzate. By accurately controlling the mass ratio between vinyl trimethoxysilane, dihydroxysuccinic acid, and the mixture of anhydrous ethanol and deionized water, the hydrolysis process can be ensured to proceed smoothly and a hydrolyzate with stable performance can be obtained.

[0037] The present invention also provides the use of the above-mentioned internal maintenance material in the base of aeolian sand roads, which can significantly improve the durability and stability of roads. By providing materials with adhesion, high strength, internal maintenance, and slow release and water retention, the unique geological and environmental challenges in aeolian sand areas can be effectively addressed, and the service life of roads can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a SEM image of the internal maintenance material suitable for the wind-blown sand road base of the present invention; Figure 2 This is a graph showing the fluidity test results of the internal maintenance material suitable for the wind-blown sand road base of the present invention; Figure 3 This is a graph showing the unconfined compressive strength test results of the internal maintenance material suitable for aeolian sand road base of the present invention; Figure 4 This is a graph showing the indirect tensile strength test results of the internal maintenance material suitable for aeolian sand road base of the present invention; Figure 5 It is a reduction rate diagram of the internal maintenance material 28d suitable for the wind-blown sand road base of the present invention. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0040] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0041] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0042] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0043] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0044] The present invention is described in further detail below: An internal maintenance material suitable for a wind-blown sand road base, comprising the following raw materials: α-methacrylic acid, γ-polyglutamic acid, sodium amide, N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate, 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 alcohol polyoxyethylene ether, 805 viscosity regulator, 3-aziridinyl propionate, and oil phase material; Specifically: In terms of mass fraction, the raw materials include: 25%~28% α-methacrylic acid, 12%~14% γ-polyglutamic acid, 4%~6% sodium amide, 5%~20% N-isopropylacrylamide, 0.2%~0.4% azobisisobutylamidine hydrochloride, 0.3%~0.4% potassium dithiooctadecanoate, 0.1%~0.2% sodium bisulfite, 12%~16% expanded perlite powder, 5%~7% magnesium silicate monohydrate, 7%~8% hollow glass microspheres, 6%~9% nano boron nitride, 1.5%~2.5% diatomaceous earth, and 3% phosphogypsum ~5%, dihydroxysuccinic acid 0.5%~1%, vinyl trimethoxy silane 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 regulator 1%~1.5%, 3-aziridinyl propionic acid 0.3%~0.6%, oil phase material 10%~11%; the oil phase material is cyclohexane and polyvinyl pyrrolidone, wherein the polyvinyl pyrrolidone is 2.5%~3.5% of the mass fraction of cyclohexane.

[0045] The expanded pearlite powder is a natural acidic glassy volcanic lava, a white, porous, honeycomb-structured granular inorganic material with a particle size of 15 μm to 75 μm, an expansion multiple of 15 times, and a density of less than 70 kg / m 3 , its surface contains hydrophilic and highly polar silanol groups (Si-OH) and silane groups (Si-O-Si). Expanded pearlite powder is a suspended white powdery solid formed above the receiving bin after instantaneous high-temperature roasting and expansion. Its chemical composition is mainly SiO2, the content is generally about 70%, and it is spherical and fine-diameter particles, porous inside with cavities, glassy and closed surface, smooth gloss, stable physical and chemical properties, and is used to provide rigid internal health-care material skeleton material.

[0046] The magnesium silicate monohydrate has a pearly luster on the surface and a fibrous cross section, a particle size of 12.06 μm, and a density of 2.032 g / cm 3 ~2.035g / cm 3 , Mohs hardness is 2~2.5, surface area is 800~900m 2 / g, internal surface area 500 m 2 / g, external surface area 400 m 2 / g, wet magnesium silicate monohydrate has extremely strong bonding properties. Magnesium silicate monohydrate is a layered chain structured hydrated magnesium-rich silicate clay mineral with low shrinkage, good plasticity, large specific surface area, strong adsorption, etc. 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.

[0047] The hollow glass microsphere is a new type of micron-sized lightweight material, the main component of which 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 / cm 3 , it has the characteristics of high compressive strength, good crack resistance and small thermal shrinkage coefficient.

[0048] The nano boron nitride has an average particle size of 50 nm, a purity of >99.9%, and a volume density of 0.11 g / cm 3 , specific surface area 43.6m 2 / g, Mohs hardness 4, hexagonal crystal form.

[0049] The diatomaceous earth is off-white and has a density of 1.9-2.3 g / cm 3 , bulk density 0.34~0.65g / cm 3 , melting point 1650℃~1750℃, specific surface area 19~65cm 2 / g, pore volume 0.45~0.98cm 3 / g, the water absorption rate is 2~4 times of its own volume.

[0050] The phosphogypsum is a gray powdery inorganic material with a density of 2.25-2.35 g / cm 3 , particle size 10μm~60μm, specific surface area 71~96cm 2 / g, crystal water content of 20%~25%, melting point of 1450℃, slightly soluble in water. Phosphogypsum is an industrial by-product produced in the process of wet phosphoric acid production. Its main component is calcium sulfate dihydrate (CaSO4·2H2O), accounting for about 70%~90%. Its particles are fine and evenly distributed, with a crystalline structure inside, strong hygroscopicity, and adjustable setting time. Phosphogypsum has a loose texture and a certain plasticity. Its physical and chemical properties are relatively stable in a suitable environment. It is often used as an adjustable filler or as a reinforcing skeleton component in internal health materials.

[0051] The dihydroxysuccinic acid is a white crystalline powder with a sour taste and is stable in the air. It is divided into anhydrous and crystalline products with a purity of more than 99.5%, a melting point of 200°C to 206°C, and a density of 1.697 g / cm 3 , its water solubility is 20.6%.

[0052] The vinyl trimethoxysilane is a colorless transparent liquid with a density of 0.496 g / cm 3 , boiling point 217℃, refractive index 1.42, improves the wettability and dispersibility of fillers in polymers.

[0053] The carrageenan is a linear polysaccharide compound composed of 3,6-anhydro-D-galactose residues and D-galactose. The galactose residues contain sulfate groups, which are divided into κ group and λ group according to the number and position of sulfate groups.

[0054] The maltodextrin is in the form of white powder or granules, slightly absorbs water, and is easily soluble in water or easily dispersed in water.

[0055] The cellulose ether is generally white or milky white, tasteless, non-toxic, fluid fibrous powder. The cellulose ether is dissolved in water in the form of colloid, and its viscosity depends on its degree of polymerization.

[0056] The lauryl alcohol polyoxyethylene ether is a new generation of synthetic polyether, which is a non-toxic, harmless, green and environmentally friendly product with good solubility in water. The polycarboxylic acid-based high-performance water reducer prepared with this material has the characteristics of low dosage, high water reduction rate, extremely small slump loss, good volume stability, and no corrosion to steel bars.

[0057] The 805 viscosity regulator has an appearance of white to slightly yellow cellulose, a moisture content of ≤30%, a viscosity of 80-300 mPa·s, and a pH value of 9-11.

[0058] The 3-aziridinyl propionate has a purity of ≥99%, a density of 1.224 g / cm3, a boiling point of 512.6°C, a refractive index of 1.541, a flash point of 236.8°C, and a PSA of 87.93.

[0059] The N-isopropylacrylamide is a white to light 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 cm 3 / mol, surface tension 25.6mN / m.

[0060] The azobisisobutylamidine hydrochloride is a white powder with a molecular weight of 271.19 and a density of 0.42 g / cm 3 , melting point 175~177℃, flash point 115.3℃.

[0061] Potassium dithiooctadecanoate 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 / cm 3 , melting point 1067℃, boiling point 1689℃.

[0062] 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° C., and a relative density of 1.48.

[0063] The α-methacrylic acid is a colorless crystal 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 monomer can be homopolymerized or copolymerized.

[0064] 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, and it is an excellent environmentally friendly polymer material.

[0065] The sodium amide is a white crystalline powder with an ammonia smell. It starts to volatilize at 400°C and decomposes into simple elements at 500-600°C. It has a melting point of 208°C, a boiling point of 400°C, and generates heat of -118.8 KJ / mol. It decomposes violently in water to generate sodium hydroxide and ammonia.

[0066] A method for preparing an internal maintenance material suitable for a wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; 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 weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir to obtain a mixture A; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0067] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzed solution of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter screen, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution into the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 min in a constant temperature water bath at 40° C., add the suspension of mixture B under continuous stirring, and mechanically stir at a speed of 300 r / min for 25 min to obtain a mixed solution D; Step 10: Add mixture A and 805 viscosity regulator dropwise into mixed solution D, and keep the temperature at 35°C-45°C. After the addition is completed, add weighed 3-aziridinyl propionate, and react with mechanical stirring at a speed of 330 r / min for 4.5 hours to obtain a composite E. Step 11: The composite E is washed with dimethyl methanol for several times, and after no dimethyl methanol evaporates, a high-strength internal curing slow-release water-retaining material for aeolian sand roads is obtained.

[0068] Among them, anhydrous ethanol, deionized water and dimethyl carbinol are solvents, which are used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0069] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0070] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0071] The present invention will be described in detail below in conjunction with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0072] The following detailed description is the description of the embodiments, and is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0073] Example 1 This example provides an internal maintenance material suitable for the base of aeolian sand roads, which includes the following raw materials by mass fraction: α-Methacrylic acid 25%, γ-polyglutamic acid 12%, sodium amide 4%, N-isopropylacrylamide 6%, azobisisobutyramidine hydrochloride 0.2%, potassium dithiooctadecanoate 0.3%, sodium bisulfite 0.1%, expanded pearlite 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 regulator 1%, 3-aziridinyl propionate 0.3%, oil phase material 10%.

[0074] Among them, in the oil phase material, vinyl pyrrolidone is 3% of the mass of cyclohexane.

[0075] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0076] The preparation method of the internal maintenance material suitable for the wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 17%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 45° C. for 3 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0077] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 60° C. for 30 minutes, and drying at 85° C. for 28 hours; the mesh size of the filter is 100 meshes; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 300 r / min for 25 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, keep the temperature at 35°C, add weighed 3-aziridinyl propionate after the addition, and stir mechanically at a speed of 330 r / min for 4.5 hours to obtain a composite E; the addition speed is 60 drops / min, and the total addition time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 5 times, and after no dimethyl methanol evaporates, an internal maintenance material suitable for aeolian sand road base is obtained.

[0078] Example 2 This example provides an internal maintenance material suitable for the base of aeolian sand roads, which includes the following raw materials by mass fraction: α-Methacrylic acid 25%, γ-polyglutamic acid 12%, sodium amide 4%, N-isopropylacrylamide 5%, azobisisobutyramidine hydrochloride 0.3%, potassium dithiooctadecanoate 0.35%, sodium bisulfite 0.15%, expanded pearlite 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 regulator 1%, 3-aziridinyl propionate 0.3%, oil phase material 10.3%.

[0079] Particularly, the oil phase materials are cyclohexane and vinyl pyrrolidone, and the mass fraction of vinyl pyrrolidone is 2.7% of the mass fraction of cyclohexane.

[0080] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0081] The preparation method of the internal maintenance material suitable for the wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 17%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 45° C. for 3 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0082] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 60° C. for 30 minutes, and drying at 85° C. for 28 hours; the mesh size of the filter is 100 meshes; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 300 r / min for 25 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, keep the temperature at 35°C, add weighed 3-aziridinyl propionate after the addition, and stir mechanically at a speed of 330 r / min for 4.5 hours to obtain a composite E; the addition speed is 60 drops / min, and the total addition time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 4 times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 1.5 hours to obtain an internal maintenance material suitable for aeolian sand road base.

[0083] Example 3 This example provides an internal maintenance material suitable for the base of aeolian sand roads, which includes the following raw materials by mass fraction: α-Methacrylic acid 25.5%, γ-polyglutamic acid 12.5%, sodium amide 4.5%, N-isopropylacrylamide 8.13%, azobisisobutyramidine hydrochloride 0.35%, potassium dithiooctadecanoate 0.38%, sodium bisulfite 0.14%, expanded pearlite 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 regulator 1.2%, 3-aziridinyl propionate 0.4%, oil phase material 10%.

[0084] Particularly, the oil phase materials are cyclohexane and vinyl pyrrolidone, and the mass fraction of vinyl pyrrolidone is 3% of the mass fraction of cyclohexane.

[0085] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0086] The preparation method of the above-mentioned internal health-care material comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 17%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 45° C. for 3 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0087] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 60° C. for 30 minutes, and drying at 85° C. for 28 hours; the mesh size of the filter is 100 meshes; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 300 r / min for 25 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, keep the temperature at 35°C, add weighed 3-aziridinyl propionate after the addition, and stir mechanically at a speed of 330 r / min for 4.5 hours to obtain a composite E; the addition speed is 60 drops / min, and the total addition time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 6 times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 1.5 hours to obtain an internal maintenance material suitable for a wind-blown sand road base.

[0088] Example 4 This example provides an internal maintenance material suitable for the base of aeolian sand roads. The material includes the following raw materials by mass fraction: α-Methacrylic acid 25%, γ-polyglutamic acid 12%, sodium amide 4%, N-isopropylacrylamide 5.5%, azobisisobutyramidine hydrochloride 0.35%, potassium dithiooctadecanoate 0.38%, sodium bisulfite 0.14%, expanded pearlite 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 regulator 1.5%, 3-aziridinyl propionate 0.5%, oil phase material 10%.

[0089] Particularly, the oil phase materials are cyclohexane and vinyl pyrrolidone, and the mass fraction of vinyl pyrrolidone is 3.5% of the mass fraction of cyclohexane.

[0090] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0091] The preparation method of the internal maintenance material suitable for the wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 17%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 45° C. for 3 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0092] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 60° C. for 30 minutes, and drying at 85° C. for 28 hours; the mesh size of the filter is 100 meshes; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 300 r / min for 25 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, keep the temperature at 35°C, add weighed 3-aziridinyl propionate after the addition, and stir mechanically at a speed of 330 r / min for 4.5 hours to obtain a composite E; the addition speed is 60 drops / min, and the total addition time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 5 times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 1.5 hours to obtain an internal maintenance material suitable for aeolian sand road base.

[0093] Example 5 This example provides an internal maintenance material suitable for the base of aeolian sand roads, which includes the following raw materials by mass fraction: α-Methacrylic acid 25.5%, γ-polyglutamic acid 12%, sodium amide 4.2%, N-isopropylacrylamide 5%, azobisisobutyramidine hydrochloride 0.35%, potassium dithiooctadecanoate 0.38%, sodium bisulfite 0.14%, expanded pearlite 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 regulator 1.12%, 3-aziridinyl propionate 0.3%, oil phase material 10%.

[0094] Particularly, the oil phase materials are cyclohexane and vinyl pyrrolidone, and the mass fraction of vinyl pyrrolidone is 2.5% of the mass fraction of cyclohexane.

[0095] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0096] The preparation method of the internal maintenance material suitable for the wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 17%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 45° C. for 3 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0097] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 60° C. for 30 minutes, and drying at 85° C. for 28 hours; the mesh size of the filter is 100 meshes; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 300 r / min for 25 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, and keep the temperature at 35°C. After the addition is completed, add weighed 3-aziridinyl propionate, and react with mechanical stirring at a speed of 330 r / min for 4.5 hours to obtain a composite E; the dropping speed is 60 drops / min, and the total dropping time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 6 times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 1.5 hours to obtain an internal maintenance material suitable for a wind-blown sand road base.

[0098] Example 6 This example provides an internal maintenance material suitable for the base of aeolian sand roads, which includes the following raw materials by mass fraction: α-Methacrylic acid 25.2%, γ-polyglutamic acid 12.1%, sodium amide 4.2%, N-isopropylacrylamide 5%, azobisisobutyramidine hydrochloride 0.2%, potassium dithiooctadecanoate 0.33%, sodium bisulfite 0.12%, expanded pearlite 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 regulator 1%, 3-aziridinyl propionate 0.35%, oil phase material 10.4%.

[0099] Particularly, the oil phase materials are cyclohexane and vinyl pyrrolidone, and the mass fraction of vinyl pyrrolidone is 3% of the mass fraction of cyclohexane.

[0100] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0101] The preparation method of the internal maintenance material suitable for the wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 17%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 45° C. for 3 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0102] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 60° C. for 30 minutes, and drying at 85° C. for 28 hours; the mesh size of the filter is 100 meshes; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 300 r / min for 25 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, keep the temperature at 35°C, add weighed 3-aziridinyl propionate after the addition, and stir mechanically at a speed of 330 r / min for 4.5 hours to obtain a composite E; the addition speed is 60 drops / min, and the total addition time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 4 times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 1.5 hours to obtain an internal maintenance material suitable for aeolian sand road base.

[0103] Example 7 This example provides an internal maintenance material suitable for the base of aeolian sand roads, which includes the following raw materials by mass fraction: α-Methacrylic acid 26.5%, γ-polyglutamic acid 13%, sodium amide 5%, N-isopropylacrylamide 12.5%, azobisisobutyramidine hydrochloride 0.3%, potassium dithiooctadecanoate 0.35%, sodium bisulfite 0.15%, expanded pearlite 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 regulator 1.25%, 3-aziridinyl propionate 0.45%, oil phase material 10.5%.

[0104] Among them, in the oil phase material, vinyl pyrrolidone is 3% of the mass of cyclohexane.

[0105] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0106] The preparation method of the internal maintenance material suitable for the wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 18.5%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 50° C. for 3.5 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane; Step 5: uniformly dispersing the mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 70° C. for 35 minutes, and drying at 90° C. for 28.3 hours; the mesh number of the filter is 110 meshes; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 8%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 290 r / min for 27 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 320 r / min for 26 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, keep the temperature at 40°C, add weighed 3-aziridinyl propionate after the addition, and stir mechanically at a speed of 340 r / min for 4.7 hours to obtain a composite E; the addition speed is 90 drops / min, and the total addition time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 4 times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 1.7 hours to obtain an internal maintenance material suitable for a wind-blown sand road base.

[0107] Example 8 This example provides an internal maintenance material suitable for the base of aeolian sand roads, which includes the following raw materials by mass fraction: α-Methacrylic acid 28%, γ-polyglutamic acid 14%, sodium amide 6%, N-isopropylacrylamide 20%, azobisisobutyramidine hydrochloride 0.4%, potassium dithiooctadecanoate 0.4%, sodium bisulfite 0.2%, expanded pearlite 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 regulator 1.5%, 3-aziridinyl propionate 0.6%, oil phase material 11%.

[0108] Among them, in the oil phase material, vinyl pyrrolidone is 3.5% of the mass of cyclohexane.

[0109] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0110] The preparation method of the internal maintenance material suitable for the wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 20%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 55° C. for 4 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0111] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 80° C. for 40 minutes, and drying at 90° C. for 28.5 hours; the mesh number of the filter is 120 meshes; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 9%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 300 r / min for 30 minutes in a constant temperature water bath environment of 50°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 330 r / min for 28 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, keep the temperature at 45°C, add weighed 3-aziridinyl propionate after the addition is completed, and mechanically stir at a speed of 350 r / min for 5 hours to obtain a composite E; the dropping speed is 120 drops / min, and the total dropping time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 6 times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 2 hours to obtain an internal maintenance material suitable for aeolian sand road base.

[0112] Comparative Example 1 The difference between the comparative example 1 and the embodiment is that the comparative example 1 does not contain nano boron nitride and maltodextrin, and the composition ratio is also different.

[0113] This comparative example 1 provides an internal maintenance material suitable for a wind-blown sand road base, which includes the following raw materials by mass fraction: α-Methacrylic acid 26.5%, γ-polyglutamic acid 12.5%, sodium amide 4.5%, N-isopropylacrylamide 8%, azobisisobutyramidine hydrochloride 0.2%, potassium dithiooctadecanoate 0.33%, sodium bisulfite 0.12%, expanded pearlite 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 regulator 1%, 3-aziridinyl propionate 0.35%, oil phase material 10.9%.

[0114] Particularly, the oil phase materials are cyclohexane and vinyl pyrrolidone, and the mass fraction of vinyl pyrrolidone is 2.5% of the mass fraction of cyclohexane.

[0115] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0116] The preparation method of the above-mentioned internal health-care material comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 17%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 45° C. for 3 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0117] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 60° C. for 30 minutes, and drying at 85° C. for 28 hours; the mesh number of the filter is 100 mesh; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 300 r / min for 25 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, and keep the temperature at 35°C-45°C. After the addition is completed, add weighed 3-aziridinyl propionate, and react with mechanical stirring at a speed of 330 r / min for 4.5 hours to obtain a composite E; the dropping speed is 60 drops / min, and the total dropping time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 5 times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 1.5 hours to obtain an internal maintenance material suitable for aeolian sand road base.

[0118] Comparative Example 2 The difference between this comparative example 2 and the embodiment is that the comparative example 2 does not contain hollow glass beads and the composition ratio is also different.

[0119] This comparative example provides an internal maintenance material suitable for a wind-blown sand road base, which includes the following raw materials by mass fraction: α-Methacrylic acid 27%, γ-polyglutamic acid 12.5%, sodium amide 4.5%, N-isopropylacrylamide 9.3%, azobisisobutyramidine hydrochloride 0.35%, potassium dithiooctadecanoate 0.38%, sodium bisulfite 0.14%, expanded pearlite 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 regulator 1.5%, 3-aziridinyl propionate 0.5%, oil phase material 10%.

[0120] Particularly, the oil phase materials are cyclohexane and vinyl pyrrolidone, and the mass fraction of vinyl pyrrolidone is 2.5% of the mass fraction of cyclohexane.

[0121] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0122] The preparation method of the internal maintenance material suitable for the wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 17%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 45° C. for 3 hours; Step 3: Evenly mix the weighed expanded perlite, magnesium silicate monohydrate, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0123] Step 5: uniformly dispersing the expanded perlite, magnesium silicate monohydrate, nano boron nitride, diatomaceous earth and phosphogypsum after mixing evenly in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified expanded perlite, magnesium silicate monohydrate, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 60° C. for 30 minutes, and drying at 85° C. for 28 hours; the mesh size of the filter is 100 meshes; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 300 r / min for 25 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B, and mixed solution D is 1:5:16; Step 10: Add mixture A and 805 viscosity regulator dropwise to mixed solution D, keep the temperature at 35°C, add weighed 3-aziridinyl propionate after the addition, and stir mechanically at a speed of 330 r / min for 4.5 hours to obtain a composite E; the addition speed is 60 drops / min, and the total addition time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for 4 times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 1.5 hours to obtain an internal maintenance material suitable for aeolian sand road base.

[0124] Comparative Example 3 The difference between this comparative example 3 and the above-mentioned embodiment is that the comparative example does not contain expanded pearlite powder and the composition ratio is also different.

[0125] This comparative example provides an internal maintenance material suitable for a wind-blown sand road base, which includes the following raw materials by mass fraction: α-Methacrylic acid 27%, γ-polyglutamic acid 13%, sodium amide 6%, N-isopropylacrylamide 10.7%, azobisisobutyramidine hydrochloride 0.4%, potassium dithiooctadecanoate 0.38%, sodium bisulfite 0.14%, magnesium silicate monohydrate 6%, hollow glass microspheres 7.5%, nano boron nitride 6.2%, diatomaceous earth 1.8%, phosphogypsum 3.2%, dihydroxysuccinic acid 0.71%, vinyltrimethoxysilane 1.5%, carrageenan 3%, maltodextrin 0.45%, cellulose ether 0.55%, lauryl alcohol polyoxyethylene ether 0.8%, 3-aziridinyl propionate 0.5%, oil phase material 10.8%.

[0126] Particularly, the oil phase materials are cyclohexane and vinyl pyrrolidone, and the mass fraction of vinyl pyrrolidone is 3% of the mass fraction of cyclohexane.

[0127] In particular, anhydrous ethanol, deionized water and dimethyl carbinol are solvents used to prepare solutions or wash raw materials and do not participate in chemical reactions.

[0128] The preparation method of the internal maintenance material suitable for the wind-blown sand road base comprises the following steps: Step 1: Weigh the above raw materials by mass; Step 2: Add γ-polyglutamic acid and α-methacrylic acid into deionized water to prepare a dilute solution with a mass concentration of 17%, add weighed sodium amide and cool to room temperature, then add weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite in sequence and stir evenly to obtain a mixture A; the stirring conditions specifically include: mechanical stirring at 45° C. for 3 hours; Step 3: Evenly mix the weighed magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum and set aside; Step 4: hydrolyze vinyl trimethoxysilane under the action of dihydroxysuccinic acid, add a certain amount of deionized water and anhydrous ethanol mixed solution, where 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 hydrolyzate of vinyltrimethoxysilane.

[0129] Step 5: uniformly dispersing the uniformly mixed magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum in the hydrolyzate of vinyltrimethoxysilane in step 4, stirring with argon gas, and then standing for a period of time to stratify, filtering with a filter, and drying the remaining wet mixture to obtain modified magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum, which is recorded as mixture B; stirring and drying are specifically: magnetic stirring at 60° C. for 30 minutes, and drying at 85° C. for 28 hours; the mesh size of the filter is 100 mesh; Step 6: Add mixture B into deionized water and stir evenly to prepare a suspension with a mass concentration of 7%, and stir magnetically for 25 minutes, which is recorded as the suspension of mixture B; Step 7: Add carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into deionized water and stir evenly to prepare a dilute solution with a mass concentration of 2%; Step 8: Add polyvinyl pyrrolidone to cyclohexane, stir evenly with argon, and mechanically stir at a speed of 180 r / min for 25 min in a constant temperature water bath at 40° C. to form an oil phase C; Step 9: slowly add the pre-prepared carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether dilute solution to the oil phase C, stir evenly with argon, and mechanically stir at a speed of 280 r / min for 25 minutes in a constant temperature water bath at 40°C. Under continuous stirring, add the suspension of mixture B, and mechanically stir at a speed of 300 r / min for 25 minutes to obtain a mixed solution D; the volume ratio of the dilute solution, oil phase C, suspension of mixture B and mixed solution D is 1:5:16; Step 10: Add mixture A dropwise to mixed solution D, maintaining the temperature at 35° C. After the addition is completed, add weighed 3-aziridinyl propionate, and react with mechanical stirring at a speed of 330 r / min for 4.5 hours to obtain a complex E; the dropping speed is 60 drops / min, and the total dropping time does not exceed 100 minutes; Step 11: The composite E is washed with dimethyl methanol for several times, and after no dimethyl methanol evaporates, it is dried at 40° C. for 1.5 hours to obtain an internal maintenance material suitable for a wind-blown sand road base.

[0130] Performance Testing When in use, directly add the internal curing materials suitable for the aeolian sand road base together with the cement-based materials into the mixing equipment for mixing, refer to GB / T8077-2023 "Concrete Admixture Homogeneity Test Method", refer to GB 8076-2008 "Concrete Admixture", refer to JC901-2002 "Cement Concrete Curing Agent", JT / T522-2022 "Highway Engineering Cement Concrete Curing Agent (Film)", DB 61 / T 1428-2021 "Cement Stabilized Aeolian Sand Pavement Base Construction Technical Specifications" and JTG According to the requirements of 3441-2024 "Test Procedure for Inorganic Binder Stabilized Materials for Highway Engineering", the unconfined compressive strength, shrinkage, cement slurry fluidity and molecular weight of the internal maintenance materials suitable for aeolian sand road base and those not mixed with the internal maintenance materials suitable for aeolian sand road base were tested respectively, and the 28d shrinkage reduction ratio was calculated. The dosage of the internal maintenance materials suitable for aeolian sand road base is 0.2% of the cement mass. The specific performance indicators are shown in the following figure.

[0131] like Figure 1 As shown in the figure, γ-polyglutamic acid, α-methacrylic acid, and N-isopropylacrylamide are continuously cross-linked and copolymerized with carrageenan, maltodextrin, cellulose ether, and lauryl alcohol polyoxyethylene ether to form a semi-interpenetrating network structure. The components are evenly dispersed, the surface is relatively smooth, and there is no obvious agglomeration phenomenon, which provides the swelling capacity of the resin. The synthesized internal maintenance material suitable for the wind-blown sand road base has a rough surface, with many wrinkles, protrusions, and holes, and has a certain layered structure. This increases the specific surface area of ​​the internal maintenance material suitable for the wind-blown sand road base, making it easier for water molecules to diffuse into its three-dimensional network structure, thereby improving the water absorption and water retention properties of the internal maintenance material.

[0132] from Figure 2 It can be seen from the various embodiments that the addition of internal curing materials to cement can significantly reduce the fluidity of cement paste compared with the blank group (without internal curing materials), the molecular weight of the self-curing agent first decreases, then increases, and then decreases. The fluidity and molecular weight of cement paste in the six groups of embodiments increase and decrease respectively compared with the control group, indicating that with the change of the composition ratio of the raw materials, the molecular weight of the polymer is affected during the synthesis of the polymer, and the proportion of the target product changes, resulting in different viscosity and water retention of the synthetic material. The internal curing material with viscosity-increasing effect can be adsorbed on 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 the internal curing material, due to its own high viscosity and strong interaction with water, the fluidity of the cement paste will gradually decrease.

[0133] Depend on Figure 3 and Figure 4It can be seen that the 7d unconfined compressive strength and indirect tensile strength of the six groups of embodiments and three groups of control examples continue to decrease with the change of the raw material composition ratio, but their strengths all meet the requirement of the standard value of 5MPa. This is because the internal curing materials absorbed a large amount of free water before 7d, resulting in a decrease in the effective water actually involved in hydration. At the same time, the internal curing materials form holes inside the material after absorbing water and swelling, resulting in a decrease in the density of the internal structure of the specimens, so the 7d strength of the specimens is reduced. The unconfined compressive strength and indirect tensile strength of the six groups of embodiments at 14d, 28d, and 60d are all higher than those of the three groups of control examples at 14d, 28d, and 60d. The highest unconfined compressive strengths reach 14%, 18%, and 22%, respectively, and the highest indirect tensile strengths reach 18%, 10%, and 7%, respectively; Depend on Figure 5 It can be seen that the shrinkage rate of the six groups of embodiments 28d is lower than that of the three groups of comparative examples, with the maximum being 24% lower, and the effect is significant, indicating that the lack of materials or the change in the proportion significantly affects the curing effect of the internal curing material. Therefore, the internal curing material can not only play a good role in viscosity increase and reinforcement, but also greatly reduce the self-shrinkage of concrete, and also has good applicability, can effectively solve the problems existing in the current maintenance process of aeolian sand road engineering, and has broad application prospects.

[0134] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. An internal maintenance material suitable for aeolian sand road base, characterized in that: In terms of mass fraction, it includes the following raw materials: α-Methacrylic acid 25%~28%; γ-polyglutamic acid 12%~14%; N-isopropyl acrylamide 5%~20%; Carrageenan 2%~3%; Maltodextrin 0.3%~0.5%; Cellulose ether 0.5%~0.8%; Lauryl alcohol polyoxyethylene ether 0.8%~1.0%; Expanded perlite powder 12%~16%; Viscosity modifier 1%~1.5%; Oil phase material 10%~11%; Auxiliary materials 29.4%~42.1%.

2. The internal maintenance material suitable for aeolian sand road base according to claim 1, characterized in that: The oil phase material comprises cyclohexane and polyvinyl pyrrolidone, and the mass fraction of polyvinyl pyrrolidone is 2.5% to 3.5% of the mass fraction of cyclohexane.

3. The internal maintenance material suitable for aeolian sand road base according to claim 1, characterized in that: The viscosity modifier is 805 viscosity modifier.

4. The internal maintenance material suitable for aeolian sand road base according to claim 1, characterized in that: The auxiliary materials include 4% to 6% sodium amide, 0.2% to 0.4% azobisisobutyramidine hydrochloride, 0.3% to 0.4% potassium dithiooctadecanoate, 0.1% to 0.2% sodium bisulfite, 5% to 7% magnesium silicate monohydrate, 7% to 8% hollow glass microspheres, 6% to 9% nano boron nitride, 1.5% to 2.5% diatomaceous earth, 3% to 5% phosphogypsum, 0.5% to 1% dihydroxysuccinic acid, 1.5% to 2% vinyltrimethoxysilane, and 0.3% to 0.6% 3-aziridinyl propionate.

5. A method for preparing an internal maintenance material suitable for aeolian sand road base according to any one of claims 1 to 4, characterized in that: The following steps are involved: Weigh each raw material according to the above mass fraction; γ-polyglutamic acid and α-methacrylic acid are prepared into a dilute solution, and weighed sodium amide is added thereto and cooled to room temperature, and then weighed N-isopropylacrylamide, azobisisobutyramidine hydrochloride, potassium dithiooctadecanoate and sodium bisulfite are added thereto in sequence, and stirred to obtain a mixture A; The mixed expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum are modified to obtain a mixture B, and the mixture B is prepared into a suspension, which is recorded as a suspension of the mixture B; Add polyvinyl pyrrolidone to cyclohexane, introduce argon gas, and mix to form oil phase material C; Add the prepared dilute solution composed of carrageenan, maltodextrin, cellulose ether and lauryl alcohol polyoxyethylene ether into the oil phase C, introduce argon gas and stir, add the suspension of the mixture B, and stir to obtain a mixed solution D; The mixture A and 805 viscosity regulator were mixed with the mixed liquid D, 3-aziridinyl propionate was added, and the composite E was obtained after mixing. The composite E was washed to obtain an internal maintenance material suitable for a wind-blown sand road base.

6. The method for preparing an internal maintenance material suitable for aeolian sand road base according to claim 5, characterized in that: During the preparation of the mixed solution D, the volume ratio of the dilute solution, the oil phase C and the suspension of the mixture B is 1:5:

16.

7. The method for preparing an internal maintenance material suitable for aeolian sand road base 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. The method for preparing an internal maintenance material suitable for a wind-blown sand road base according to claim 5, characterized in that: The hydrolyzed solution of vinyltrimethoxysilane was used to modify expanded perlite, magnesium silicate monohydrate, hollow glass microspheres, nano boron nitride, diatomaceous earth and phosphogypsum.

9. The method for preparing an internal maintenance material suitable for a wind-blown sand road base according to claim 8, characterized in that: The preparation method of the hydrolyzate of vinyl trimethoxysilane comprises the following steps: mixing vinyl trimethoxysilane with dihydroxysuccinic acid, adding a mixed solution of deionized water and anhydrous ethanol, and preparing the hydrolyzate of vinyl trimethoxysilane; the mass ratio of the mixed solution of anhydrous ethanol and deionized water, the dihydroxysuccinic acid and the vinyl trimethoxysilane is 14:3:

1.

10. Use of the internal maintenance material suitable for aeolian sand road base according to claim 1 in aeolian sand road base.

Images