Preparation method of pourable super absorbent resin for building backfill layer accumulated water treatment

Abstract

The invention relates to the technical field of high polymer material preparation, in particular to a preparation method of pourable super absorbent resin for building backfill layer accumulated water treatment. Comprising the following steps: obtaining surface aminated nano SiO2; the preparation method comprises the following steps: adding 0.05-10 parts of surface aminated nano SiO2 and 0.1-10 parts of a natural polyphenol compound into 100 parts of distilled water, and stirring; after the mixture is uniformly stirred, a Tris-HC1 buffer solution is dropwise added; after the reaction is completed, centrifugally separating and collecting a product to obtain a nano SiO2 hybrid; the preparation method comprises the following steps: adding 0.05-10 parts of a nano SiO2 hybrid into 100 parts of distilled water, carrying out ultrasonic dispersion for 0.5-2 hours, and slowly adding 10-30 parts of a vinyl monomer and 5-20 parts of sodium hydroxide; 0.01 to 0.1 part of ammonium persulfate and 0.01 to 0.1 part of sodium hydrogen sulfite are added; 0.05-2 parts of a post-crosslinking agent is added into the polymer solution, the pourable super absorbent resin is obtained, in this way, accumulated water of the backfill layer is efficiently absorbed, the backfill material is effectively solidified to form a stable waterproof barrier, and fixed-point and efficient treatment of the accumulated water of the backfill layer can be met.

Description

Technical Field

[0001] The invention relates to the technical field of polymer material preparation, in particular to a method for preparing a pourable superabsorbent resin for treating accumulated water in building backfill layers. Background Art

[0002] During construction and subsequent use, moisture accumulation within backfill materials (such as soil-rock mixtures, gravel, and slag) is a common problem. This can significantly weaken the overall stability of the building structure and can also lead to secondary hazards such as wall leakage and pipe corrosion, posing a serious threat to the building's safety and service life. Traditional drainage methods (such as excavation and pipe laying) are associated with high construction costs, extensive earthwork, and low drainage efficiency.

[0003] Super absorbent resin is a type of functional polymer material with a three-dimensional cross-linked network structure. Its molecular chain contains a large number of hydrophilic groups (such as carboxyl, hydroxyl, etc.), which enables it to efficiently absorb water through osmotic pressure and hydrogen bonding, and rely on the cross-linked network to maintain a gel state without dissolving. It can usually absorb hundreds or even thousands of times its own weight in water, and at the same time has excellent water retention properties. It can keep water from being lost even under pressure conditions, showing good application prospects in the field of water management in building backfill layers.

[0004] However, most existing superabsorbent resin products exist in the form of pre-cross-linked solid particles or powders. They have a complete cross-linked network structure before application and lack fluidity, which makes it difficult for them to penetrate the tiny gaps in the sand backfill material and penetrate into the water-logged area below the backfill layer to absorb moisture. In addition, they lack wet adhesion and cannot effectively consolidate the backfill material to form a stable waterproof barrier, making it difficult to meet the requirements of fixed-point and efficient management of water accumulation in the backfill layer. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for preparing a pourable superabsorbent resin for treating water accumulation in building backfill layers. The method aims to solve the technical problem that existing superabsorbent resin products mostly exist in the form of pre-crosslinked solid particles or powders. They have a complete cross-linked network structure before application and lack fluidity, which is not conducive to their penetration through the fine gaps in the sand backfill material and penetrating into the water accumulation area below the backfill layer to absorb moisture. In addition, they lack wet adhesion and cannot effectively consolidate the backfill material to form a stable waterproof barrier, resulting in their difficulty in meeting the technical requirements of fixed-point and efficient treatment of water accumulation in the backfill layer.

[0006] To achieve the above object, the present invention adopts a method for preparing a pourable super absorbent resin for treating water accumulation in building backfill layers, comprising the following steps: Dissolve 0.5-10 parts of an amino-containing silane coupling agent in 100 parts of a mixed solution of water and ethanol in a volume ratio of 75:25; The solution was stirred continuously, and 0.05-10 parts of nano-SiO2 was slowly added, and the reaction was carried out at 80°C for 1-12 hours; After the reaction is completed, the product is separated by filtration and vacuum dried at 40-80°C for 5-24 hours to obtain surface amino-modified nano-SiO2; Add 0.05-10 parts of surface amino-treated nano-SiO2 and 0.1-10 parts of natural polyphenol compound to 100 parts of distilled water and stir; After stirring evenly, add Tris-HCl buffer dropwise to adjust the pH value of the reaction system to 7-10, and continue the reaction at room temperature for 2-12 hours; After the reaction is completed, the product is collected by centrifugation and dried in vacuum at 40-80°C for 5-24 hours to obtain a nano-SiO2 hybrid. Add 0.05-10 parts of nano-SiO2 hybrid to 100 parts of distilled water, ultrasonically disperse for 0.5-2 hours, and then slowly add 10-30 parts of olefin monomer and 5-20 parts of sodium hydroxide; Add 0.01-0.1 parts of ammonium persulfate and 0.01-0.1 parts of sodium bisulfite, and react at 60°C for 0.5-8 hours to obtain a polymer solution; After the polymer solution is cooled to room temperature, 0.05 to 2 parts of a post-crosslinking agent are added to the polymer solution, and magnetic stirring is continued for 1 to 30 minutes to obtain a pourable super absorbent resin.

[0007] Wherein, in the step of dissolving 0.5 to 10 parts of an amino-containing silane coupling agent in 100 parts of a mixed solution of water and ethanol in a volume ratio of 75:25: The amino-containing silane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, β-aminoethyl-γ-aminopropyltrimethoxysilane, and γ-aminopropylmethyldiethoxysilane.

[0008] Wherein, in the step of continuously stirring the solution, slowly adding 0.05 to 10 parts of nano-SiO2, and reacting at 80°C for 1 to 12 hours: The specific surface area of ​​nano-SiO2 is 100m 2 / g, 150m 2 / g, 200m 2 / g、300m 2 / g or 450m 2 / g.

[0009] Wherein, in the step of adding 0.05-10 parts of surface amino-treated nano-SiO2 and 0.1-10 parts of natural polyphenol compound to 100 parts of distilled water and stirring: The natural polyphenol compound is one or more of tannic acid, dopamine and gallic acid.

[0010] Among them, in the step of adding 0.05-10 parts of nano-SiO2 hybrid to 100 parts of distilled water, ultrasonically dispersing for 0.5-2 hours, and then slowly adding 10-30 parts of olefin monomer and 5-20 parts of sodium hydroxide: The vinyl monomer is one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, acrylic acid amide, sulfobetaine methacrylate, and 2-acrylamide-2-methylpropanesulfonic acid.

[0011] wherein, after the polymer solution is cooled to room temperature, 0.05 to 2 parts of a post-crosslinking agent is added to the polymer solution, and magnetic stirring is continued for 1 to 30 minutes to obtain a pourable super absorbent resin; The post-crosslinking agent is one or more of trimethylolpropane tris(aziridine) propionate, pentaerythritol tetra(aziridine) propionate, polyethylene glycol bis(aziridine) propionate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, diisopropylcarbodiimide, poly(hexamethylenecarbodiimide), and poly[methylenebis(phenylcarbodiimide)].

[0012] The invention discloses a preparation method of a pourable superabsorbent resin for treating accumulated water in a building backfill layer. The method comprises the following steps: dissolving 0.5 to 10 parts of an amino-containing silane coupling agent in 100 parts of a mixed solution of water and ethanol in a volume ratio of 75:25; continuously stirring the solution, slowly adding 0.05 to 10 parts of nano-SiO2, and reacting at 80°C for 1 to 12 hours; filtering and separating the product after the reaction is completed, vacuum drying at 40 to 80°C for 5 to 24 hours to obtain surface-aminated nano-SiO2; adding 0.05 to 10 parts of surface-aminated nano-SiO2 and 0.1 to 10 parts of a natural polyphenol compound to 100 parts of distilled water, and stirring the mixture; and after uniform stirring, adding Tris-HCl buffer dropwise to adjust the pH value of the reaction system to 0. Adjust to 7-10, and continue to react at room temperature for 2-12 hours; after the reaction is completed, collect the product by centrifugation, and vacuum dry it at 40-80°C for 5-24 hours to obtain a nano-SiO2 hybrid; add 0.05-10 parts of nano-SiO2 hybrid to 100 parts of distilled water, ultrasonically disperse it for 0.5-2 hours, and then slowly add 10-30 parts of olefin monomer and 5-20 parts of sodium hydroxide; then, add 0.01-0.1 parts of ammonium persulfate and 0.01-0.1 parts of sodium bisulfite, and react at a constant temperature of 60°C for 0.5-8 hours to obtain a polymer solution; after the polymer solution is cooled to room temperature, add 0.05-2 parts of a post-crosslinking agent to the polymer solution, and continue magnetic stirring for 1-30 minutes to obtain a pourable super absorbent resin; In the above method, hydrophilic acrylic acid and its derivatives are used as comonomers, and highly reactive aziridine / carbodiimide is used as a crosslinking agent. The free radical solution polymerization-post-crosslinking two-step method is innovatively adopted to prepare a super absorbent resin. By precisely controlling the underwater gelation behavior of the resin, it is endowed with excellent perfusability, so that it can fully penetrate the internal pore structure of the backfill material and directly reach the water accumulation area; at the same time, the hydrophilic acrylic acid and its derivatives of the resin comonomer are rich in various hydrophilic functional groups such as carboxyl, amide, hydroxyl and sulfonic acid groups, which make the resin have high water absorption capacity, thereby facilitating the resin system to achieve targeted and efficient absorption of water accumulation in the backfill layer; nano-SiO2 with cost advantages, high mechanical strength and good hydrophilicity is selected, and the silanol produced by the hydrolysis of the amino-containing silane coupling agent is firstly reacted with the silanol on the surface of the nano-SiO2 to prepare an amino-SiO2. O2, then, based on the multiple interactions between the phenolic hydroxyl groups in the natural polyphenol molecules and the amino SiO2 surface (including electrostatic attraction, hydrogen bonding and Schiff base reaction, etc.), the polyphenol compounds are firmly anchored and coated on the SiO2 surface to construct a SiO2 hybrid; on this basis, the SiO2 hybrid is introduced into the resin synthesis system. On the one hand, the rigid SiO2 nanoparticles can exert a reinforcing effect on the resin, significantly improving the cohesive strength of the gel network. On the other hand, with the help of the polyphenol groups on the SiO2 surface, multiple bonding effects (hydrogen bonding, ionic bonding, metal coordination and hydrophobic interaction, etc.) are constructed between the resin system and the bonding substrate, greatly enhancing the wet adhesion performance of the system, which is beneficial to the effective consolidation of the resin backfill material to form a stable waterproof barrier, realizing efficient absorption of the accumulated water in the backfill layer, and effectively consolidating the backfill material to form a stable waterproof barrier, which can meet the fixed-point and efficient treatment of the accumulated water in the backfill layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 It is a step flow chart of Example 1 of the present invention.

[0015] Figure 2 This is a step flow chart of Example 2 of the present invention.

[0016] Figure 3 This is a step flow chart of Example 3 of the present invention. DETAILED DESCRIPTION

[0017] Example 1, please refer to Figure 1The present invention provides a method for preparing a pourable super absorbent resin for treating water accumulation in building backfill layers, comprising the following steps: S101: dissolving 1 part of γ-aminopropyltriethoxysilane in 100 parts of a mixed solution of water and ethanol in a volume ratio of 75:25; S102: The solution was stirred continuously and 0.5 parts of a 100 m 2 / g of nano-SiO2 and reacted at 80°C for 2h; S103: After the reaction is completed, the product is separated by filtration and dried in vacuum at 50°C for 8 hours to obtain surface amino-modified nano-SiO2; S104: adding 0.5 parts of surface amino-treated nano-SiO2 and 1 part of tannic acid to 100 parts of distilled water and stirring; S105: After stirring evenly, Tris-HCl buffer was added dropwise to adjust the pH value of the reaction system to 7.5, and the reaction was continued at room temperature for 5 hours; S106: After the reaction is completed, the product is collected by centrifugation and dried in vacuum at 50° C. for 8 h to obtain a nano-SiO2 hybrid; S107: Add 0.5 parts of nano-SiO2 hybrid to 100 parts of distilled water, disperse it by ultrasonic for 0.5 hours, and then slowly add 10 parts of acrylic acid and 5 parts of sodium hydroxide; S108: adding 0.01 parts of ammonium persulfate and 0.01 parts of sodium bisulfite, and reacting at 60° C. for 0.5 h to obtain a polymer solution; S109: After the polymer solution is cooled to room temperature, 0.1 parts of trimethylolpropane tris(aziridine) propionate is added to the polymer solution, and magnetic stirring is continued for 5 minutes to obtain a pourable super absorbent resin.

[0018] Furthermore, the amino-containing silane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, β-aminoethyl-γ-aminopropyltrimethoxysilane, and γ-aminopropylmethyldiethoxysilane.

[0019] Furthermore, the specific surface area of ​​nano-SiO2 is 100m 2 / g, 150m 2 / g, 200m 2 / g、300m 2 / g or 450m 2 / g.

[0020] Furthermore, the natural polyphenol compound is one or more of tannic acid, dopamine, and gallic acid.

[0021] Furthermore, the vinyl monomer is one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, acrylic acid amide, sulfobetaine methacrylate, and 2-acrylamide-2-methylpropanesulfonic acid.

[0022] Furthermore, the post-crosslinking agent is one or more of trimethylolpropane tris(aziridine) propionate, pentaerythritol tetra(aziridine) propionate, polyethylene glycol bis(aziridine) propionate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, diisopropylcarbodiimide, poly(hexamethylenecarbodiimide), and poly[methylenebis(phenylcarbodiimide)].

[0023] In this embodiment, 1 part of γ-aminopropyltriethoxysilane is dissolved in 100 parts of a mixed solution of water and ethanol with a volume ratio of 75:25. Subsequently, the solution is continuously stirred and 0.5 parts of a 100m2-specific surface area silane is slowly added. 2 / g of nano-SiO2, and react at 80°C for 2h. After the reaction is completed, the product is filtered and separated, and vacuum dried at 50°C for 8h to obtain surface-aminated nano-SiO2. 0.5 parts of surface-aminated nano-SiO2 and 1 part of tannic acid are added to 100 parts of distilled water and stirred. After stirring evenly, Tris-HCl buffer is added dropwise to adjust the pH value of the reaction system to 7.5. The reaction is continued at room temperature for 5h. After the reaction is completed, the product is collected by centrifugation and vacuum dried at 50°C for 8h to obtain nano-SiO2 hybrid. 0.5 parts of nano-SiO2 hybrid are added to 100 parts of distilled water, and 0.5 parts of nano-SiO2 hybrid are ultrasonically dispersed. h later, 10 parts of acrylic acid and 5 parts of sodium hydroxide were slowly added, followed by adding 0.01 parts of ammonium persulfate and 0.01 parts of sodium bisulfite. After constant temperature reaction at 60°C for 0.5h, a polymer solution was obtained. After the polymer solution was cooled to room temperature, 0.1 parts of trimethylolpropane tris(aziridine) propionate was added to the polymer solution. The magnetic stirring was continued for 5 minutes to obtain a pourable super absorbent resin. The pouring operation time was 240 minutes, the water absorption rate was 500g / g, and the wet adhesion strength was 450kPa. It achieved efficient absorption of the accumulated water in the backfill layer and effectively consolidated the backfill material to form a stable waterproof barrier, which can meet the needs of fixed-point and efficient treatment of the accumulated water in the backfill layer.

[0024] Example 2, please refer to Figure 2 The present invention provides a method for preparing a pourable super absorbent resin for treating water accumulation in building backfill layers, comprising the following steps: S101: dissolving 5 parts of γ-aminopropyltrimethoxysilane in 100 parts of a mixed solution of water and ethanol in a volume ratio of 75:25; S102: Stir the solution continuously and slowly add 5 parts of a solution with a specific surface area of ​​150m 2 / g of nano-SiO2 and reacted at 80°C for 8h; S103: After the reaction is completed, the product is separated by filtration and dried in vacuum at 60°C for 10 hours to obtain surface amino-modified nano-SiO2; S104: adding 5 parts of surface amino-treated nano-SiO2 and 10 parts of dopamine to 100 parts of distilled water and stirring; S105: After stirring evenly, Tris-HCl buffer was added dropwise to adjust the pH value of the reaction system to 8, and the reaction was continued at room temperature for 10 hours; S106: After the reaction is completed, the product is collected by centrifugation and dried in vacuum at 80° C. for 15 h to obtain a nano-SiO2 hybrid; S107: Add 5 parts of nano-SiO2 hybrid to 100 parts of distilled water, disperse under ultrasonication for 1 hour, and then slowly add 20 parts of methacrylic acid and 15 parts of sodium hydroxide; S108: adding 0.05 parts of ammonium persulfate and 0.05 parts of sodium bisulfite, and reacting at 60° C. for 4 hours to obtain a polymer solution; S109: After the polymer solution is cooled to room temperature, 1 part of post-poly (hexamethylenecarbodiimide) is added to the polymer solution, and magnetic stirring is continued for 10 minutes to obtain a pourable super absorbent resin.

[0025] Furthermore, the amino-containing silane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, β-aminoethyl-γ-aminopropyltrimethoxysilane, and γ-aminopropylmethyldiethoxysilane.

[0026] Furthermore, the specific surface area of ​​nano-SiO2 is 100m 2 / g, 150m 2 / g, 200m 2 / g、300m 2 / g or 450m 2 / g.

[0027] Furthermore, the natural polyphenol compound is one or more of tannic acid, dopamine, and gallic acid.

[0028] Furthermore, the vinyl monomer is one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, acrylic acid amide, sulfobetaine methacrylate, and 2-acrylamide-2-methylpropanesulfonic acid.

[0029] Furthermore, the post-crosslinking agent is one or more of trimethylolpropane tris(aziridine) propionate, pentaerythritol tetra(aziridine) propionate, polyethylene glycol bis(aziridine) propionate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, diisopropylcarbodiimide, poly(hexamethylenecarbodiimide), and poly[methylenebis(phenylcarbodiimide)].

[0030] In this embodiment, 5 parts of γ-aminopropyltrimethoxysilane are dissolved in 100 parts of a mixed solution of water and ethanol with a volume ratio of 75:25. Subsequently, the solution is continuously stirred and 5 parts of a 150 m2-specific surface area silane are slowly added. 2 / g of nano-SiO2, and react at 80°C for 8h. After the reaction is completed, the product is filtered and separated, and vacuum-dried at 60°C for 10h to obtain surface-aminated nano-SiO2. 5 parts of surface-aminated nano-SiO2 and 10 parts of dopamine are added to 100 parts of distilled water and stirred. After stirring evenly, Tris-HCl buffer is added dropwise to adjust the pH value of the reaction system to 8. The reaction is continued at room temperature for 10h. After the reaction is completed, the product is collected by centrifugation and vacuum-dried at 80°C for 15h to obtain a nano-SiO2 hybrid. 5 parts of nano-SiO2 hybrid are added to 100 parts of distilled water and ultrasonically dispersed for 1h After that, 20 parts of methacrylic acid and 15 parts of sodium hydroxide were slowly added, followed by adding 0.05 parts of ammonium persulfate and 0.05 parts of sodium bisulfite. After constant temperature reaction at 60°C for 4 hours, a polymer solution was obtained. After the polymer solution was cooled to room temperature, 1 part of post-poly (hexamethylenecarbodiimide) was added to the polymer solution. The magnetic stirring was continued for 10 minutes to obtain a pourable super absorbent resin. The pouring operation time was 150 minutes, the water absorption rate was 600g / g, and the wet adhesion strength was 350kPa. It achieved efficient absorption of the accumulated water in the backfill layer and effectively consolidated the backfill material to form a stable waterproof barrier, which can meet the needs of fixed-point and efficient treatment of the accumulated water in the backfill layer.

[0031] Example 3, please refer to Figure 3 The present invention provides a method for preparing a pourable super absorbent resin for treating water accumulation in building backfill layers, comprising the following steps: S101: dissolving 10 parts of γ-aminopropylmethyldiethoxysilane in 100 parts of a mixed solution of water and ethanol in a volume ratio of 75:25; S102: Stir the solution continuously and slowly add 10 parts of a 2 / g of nano-SiO2 and reacted at 80°C for 12h; S103: After the reaction is completed, the product is separated by filtration and dried in vacuum at 80°C for 24 hours to obtain surface amino-modified nano-SiO2; S104: adding 10 parts of surface amino-treated nano-SiO2 and 10 parts of gallic acid to 100 parts of distilled water and stirring; S105: After stirring evenly, Tris-HCl buffer was added dropwise to adjust the pH value of the reaction system to 9, and the reaction was continued at room temperature for 12 hours; S106: After the reaction is completed, the product is collected by centrifugation and dried in vacuum at 80° C. for 24 h to obtain a nano-SiO2 hybrid; S107: Add 10 parts of nano-SiO2 hybrid to 100 parts of distilled water, disperse under ultrasonication for 2 hours, and then slowly add 20 parts of acrylic acid, 10 parts of sulfobetaine methacrylate and 20 parts of sodium hydroxide; S108: adding 0.1 parts of ammonium persulfate and 0.1 parts of sodium bisulfite, and reacting at 60° C. for 8 hours to obtain a polymer solution; S109: After the polymer solution is cooled to room temperature, 2 parts of poly (methylene bis (phenyl carbodiimide)) are added to the polymer solution, and magnetic stirring is continued for 30 minutes to obtain a pourable super absorbent resin.

[0032] Furthermore, the amino-containing silane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, β-aminoethyl-γ-aminopropyltrimethoxysilane, and γ-aminopropylmethyldiethoxysilane.

[0033] Furthermore, the specific surface area of ​​nano-SiO2 is 100m 2 / g, 150m 2 / g, 200m 2 / g、300m 2 / g or 450m 2 / g.

[0034] Furthermore, the natural polyphenol compound is one or more of tannic acid, dopamine, and gallic acid.

[0035] Furthermore, the vinyl monomer is one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, acrylic acid amide, sulfobetaine methacrylate, and 2-acrylamide-2-methylpropanesulfonic acid.

[0036] Furthermore, the post-crosslinking agent is one or more of trimethylolpropane tris(aziridine) propionate, pentaerythritol tetra(aziridine) propionate, polyethylene glycol bis(aziridine) propionate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, diisopropylcarbodiimide, poly(hexamethylenecarbodiimide), and poly[methylenebis(phenylcarbodiimide)].

[0037] In this embodiment, 10 parts of γ-aminopropylmethyldiethoxysilane are dissolved in 100 parts of a mixed solution of water and ethanol with a volume ratio of 75:25. Subsequently, the solution is continuously stirred and 10 parts of a 450m2-specific surface area silane are slowly added. 2 / g of nano-SiO2, and react at 80 ° C for 12 hours. After the reaction is completed, the product is filtered and separated, and vacuum dried at 80 ° C for 24 hours to obtain surface-aminated nano-SiO2. 10 parts of surface-aminated nano-SiO2 and 10 parts of gallic acid are added to 100 parts of distilled water and stirred. After stirring evenly, Tris-HCl buffer is added dropwise to adjust the pH value of the reaction system to 9. The reaction is continued at room temperature for 12 hours. After the reaction is completed, the product is collected by centrifugation and vacuum dried at 80 ° C for 24 hours to obtain a nano-SiO2 hybrid. 10 parts of nano-SiO2 hybrid are added to 100 parts of distilled water, ultrasonically dispersed for 2 hours, and then 20 parts of acrylic acid, 10 Parts of sulfobetaine methacrylate and 20 parts of sodium hydroxide were added, followed by the addition of 0.1 parts of ammonium persulfate and 0.1 parts of sodium bisulfite. After the reaction was carried out at a constant temperature of 60°C for 8 hours, a polymer solution was obtained. After the polymer solution was cooled to room temperature, 2 parts of poly[methylenebis(phenylcarbodiimide)] were added to the polymer solution. The mixture was magnetically stirred for 30 minutes to obtain a pourable super absorbent resin. The pouring operation time was 120 minutes, the water absorption rate was 800g / g, and the wet adhesion strength was 250kPa. The water accumulated in the backfill layer was efficiently absorbed, and the backfill material was effectively consolidated to form a stable waterproof barrier, which can meet the needs of fixed-point and efficient treatment of water accumulated in the backfill layer.

[0038] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of the rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A method for preparing a pourable super absorbent resin for treating water accumulation in building backfill layers, characterized in that: The steps include: Dissolve 0.5-10 parts of an amino-containing silane coupling agent in 100 parts of a mixed solution of water and ethanol in a volume ratio of 75:25; The solution was stirred continuously, and 0.05-10 parts of nano-SiO2 was slowly added, and the reaction was carried out at 80°C for 1-12 hours; After the reaction is completed, the product is separated by filtration and vacuum dried at 40-80°C for 5-24 hours to obtain surface amino-modified nano-SiO2; Add 0.05-10 parts of surface amino-modified nano-SiO2 and 0.1-10 parts of natural polyphenol compound to 100 parts of distilled water and stir; After stirring evenly, add Tris-HCl buffer dropwise to adjust the pH value of the reaction system to 7-10, and continue the reaction at room temperature for 2-12 hours; After the reaction is completed, the product is collected by centrifugation and dried in vacuum at 40-80°C for 5-24 hours to obtain a nano-SiO2 hybrid. Add 0.05-10 parts of nano-SiO2 hybrid to 100 parts of distilled water, ultrasonically disperse for 0.5-2 hours, and then slowly add 10-30 parts of olefin monomer and 5-20 parts of sodium hydroxide; Add 0.01-0.1 parts of ammonium persulfate and 0.01-0.1 parts of sodium bisulfite, and react at 60°C for 0.5-8 hours to obtain a polymer solution; After the polymer solution is cooled to room temperature, 0.05 to 2 parts of a post-crosslinking agent is added to the polymer solution, and magnetic stirring is continued for 1 to 30 minutes to obtain a pourable super absorbent resin.

2. The method for preparing the pourable super absorbent resin for treating accumulated water in building backfill layer according to claim 1, wherein: In the step of dissolving 0.5 to 10 parts of an amino-containing silane coupling agent in 100 parts of a mixed solution of water and ethanol in a volume ratio of 75:25: The amino-containing silane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, β-aminoethyl-γ-aminopropyltrimethoxysilane, and γ-aminopropylmethyldiethoxysilane.

3. The method for preparing the pourable super absorbent resin for treating accumulated water in building backfill layer according to claim 1, wherein: While continuously stirring the solution, slowly adding 0.05-10 parts of nano-SiO2 and reacting at 80°C for 1-12 hours: The specific surface area of ​​nano-SiO2 is 100m 2 / g, 150m 2 / g, 200m 2 / g、300m 2 / g or 450m 2 / g.

4. The method for preparing the pourable super absorbent resin for treating accumulated water in building backfill layer according to claim 1, wherein: In the step of adding 0.05-10 parts of surface amino-treated nano-SiO2 and 0.1-10 parts of natural polyphenol compound to 100 parts of distilled water and stirring: The natural polyphenol compound is one or more of tannic acid, dopamine and gallic acid.

5. The method for preparing the pourable super absorbent resin for treating accumulated water in building backfill layer according to claim 1, wherein: In the step of adding 0.05-10 parts of nano-SiO2 hybrid to 100 parts of distilled water, ultrasonically dispersing for 0.5-2 hours, and then slowly adding 10-30 parts of olefin monomer and 5-20 parts of sodium hydroxide: The vinyl monomer is one or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, acrylic acid amide, sulfobetaine methacrylate, and 2-acrylamide-2-methylpropanesulfonic acid.

6. The method for preparing the pourable super absorbent resin for treating accumulated water in building backfill layer according to claim 1, wherein: After the polymer solution is cooled to room temperature, 0.05 to 2 parts of a post-crosslinking agent is added to the polymer solution, and magnetic stirring is continued for 1 to 30 minutes to obtain a pourable super absorbent resin: The post-crosslinking agent is one or more of trimethylolpropane tris(aziridine) propionate, pentaerythritol tetra(aziridine) propionate, polyethylene glycol bis(aziridine) propionate, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, diisopropylcarbodiimide, poly(hexamethylenecarbodiimide), and poly[methylenebis(phenylcarbodiimide)].

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