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CN-121991290-A - Hydrogel-cellulose composite curing material for disintegrating red soil and preparation method thereof

CN121991290ACN 121991290 ACN121991290 ACN 121991290ACN-121991290-A

Abstract

The invention discloses a hydrogel-cellulose composite curing material for disintegrative red soil and a preparation method thereof, which belong to the technical field of ecological restoration and engineering reinforcement of the disintegrative red soil in the south, and are particularly suitable for red soil slope protection, water and soil conservation and roadbed reinforcement scenes. The material is prepared from sodium carboxymethyl cellulose, acrylic acid, acrylamide, N' -methylene bisacrylamide, potassium persulfate, sodium hydroxide and nano montmorillonite by taking sodium carboxymethyl cellulose as a framework and grafting a hydrogel network through in-situ polymerization. The composite cured material prepared by the invention can remarkably improve the disintegration resistance, agglomeration stability, mechanical strength and water retention of red soil, and the disintegration inhibition rate of the red soil is more than 90 percent by adding 5 percent of the material, the water-stable agglomerate content of more than 0.25mm is improved by nearly 3 times to 58.9 percent compared with a blank group, the unconfined compressive strength is improved by 3.7 times to 598kPa compared with the blank group, and the saturated water retention capacity is improved to 52.6 percent.

Inventors

  • YAO CHI
  • WAN CHANGMING
  • WANG JIQING
  • XIAO GANG
  • YAO CHANGGUANG
  • LU ZIYUN
  • ZHAO HUA

Assignees

  • 南昌大学
  • 江西省交通投资集团有限责任公司

Dates

Publication Date
20260508
Application Date
20260303

Claims (10)

  1. 1. The hydrogel-cellulose composite curing material for the disintegrative red soil is characterized by comprising, by weight, 10-20 parts of sodium carboxymethyl cellulose, 8-15 parts of acrylic acid, 5-12 parts of acrylamide, 0.1-0.5 part of N, N' -methylenebisacrylamide, 0.2-0.8 part of potassium persulfate, 3-8 parts of sodium hydroxide and 2-6 parts of nano montmorillonite, wherein the particle size of the nano montmorillonite is 50-100nm.
  2. 2. The hydrogel-cellulose composite cured material for disintegrating red soil according to claim 1, wherein the hydrogel-cellulose composite cured material comprises, by weight, 12-18 parts of sodium carboxymethyl cellulose, 10-13 parts of acrylic acid, 7-10 parts of acrylamide, 0.2-0.4 part of N, N' -methylenebisacrylamide, 0.4-0.6 part of potassium persulfate, 4-6 parts of sodium hydroxide and 3-5 parts of nano montmorillonite.
  3. 3. Use of a hydrogel-cellulose composite cured material for disintegrated red soil according to any one of claims 1-2 in disintegrated red soil slope protection, soil erosion remediation or subgrade reinforcement.
  4. 4. The method for preparing the hydrogel-cellulose composite cured material for the disintegrating red soil according to any one of claims 1 to 2, wherein the modified cellulose is used as a skeleton base material, and the hydrogel-cellulose composite cured material is prepared by in-situ polymerization grafting of a hydrogel network, and specifically comprises the following steps: s1, dissolving sodium carboxymethyl cellulose in water, stirring until the sodium carboxymethyl cellulose is completely dissolved, adding nano montmorillonite, and performing ultrasonic dispersion to obtain a mixed solution A; s2, adding acrylic acid into a reaction container, stirring and dropwise adding sodium hydroxide solution to adjust the pH, then adding acrylamide and N, N '-methylenebisacrylamide, and stirring until the acrylamide and the N, N' -methylenebisacrylamide are completely dissolved to obtain a mixed solution B; S3, adding the mixed solution B obtained in the step S2 into the mixed solution A obtained in the step S1, uniformly stirring, heating, and adding potassium persulfate to initiate polymerization reaction to obtain a gel product; s4, drying the gel product obtained in the step S3, crushing, and screening to obtain a target product.
  5. 5. The method for producing a hydrogel-cellulose composite cured material for disintegrable red soil according to claim 4, wherein the water is added in an amount of 20 to 30 times the mass of sodium carboxymethylcellulose in step S1.
  6. 6. The method for preparing a hydrogel-cellulose composite cured material for disintegrable red soil according to claim 4, wherein in step S1, the power of ultrasonic dispersion is 150-200W, and the time of ultrasonic dispersion is 15-30min.
  7. 7. The method for producing a hydrogel-cellulose composite cured material for use in disintegrating red soil according to claim 4, wherein in step S2, the pH is adjusted to 6.5 to 7.5.
  8. 8. The method for producing a hydrogel-cellulose composite cured material for use in disintegrating red soil according to claim 4, wherein in step S2, the mass concentration of the sodium hydroxide solution is 20 to 30%.
  9. 9. The method for preparing a hydrogel-cellulose composite cured material for disintegrable red soil according to claim 4, wherein in step S3, the temperature is raised to 60-80 ℃ at a rate of 2-5 ℃ per minute, and the polymerization time is 2-4 hours.
  10. 10. The method for producing a hydrogel-cellulose composite cured material for use in disintegrating red soil according to claim 4, wherein in step S4, the drying temperature is 60 to 80℃and the mesh size of the mesh is 80 to 100.

Description

Hydrogel-cellulose composite curing material for disintegrating red soil and preparation method thereof Technical Field The invention belongs to the technical field of ecological restoration and engineering reinforcement of south disintegrative red soil, is particularly suitable for red soil slope protection, water and soil conservation and roadbed reinforcement scenes, and particularly relates to a hydrogel-cellulose composite cured material for the disintegrative red soil and a preparation method thereof. Background The disintegrating red soil is widely distributed in the south area, and has the characteristics of easy disintegration in water, poor erosion resistance, low mechanical strength and the like, thereby seriously affecting the slope stability, the water and soil conservation and the safety of engineering roadbed. In the process of engineering construction and ecological restoration in red soil areas, how to effectively improve the structure of disintegrating red soil and improve the anti-disintegration capacity and mechanical properties of the red soil becomes a technical problem to be solved urgently. Currently, the improvement methods for disintegrated red soil mainly comprise a physical improvement method and a chemical improvement method. Physical improvement methods such as adding straw, organic fertilizer and the like can improve the soil structure to a certain extent, but the improvement effect lasts for a short time and the anti-erosion capability is limited, and chemical improvement methods such as adding inorganic curing agents such as cement, lime and the like can rapidly improve the mechanical strength of the soil, but have the problems of higher energy consumption, large environmental pollution, easiness in cracking and the like, and have poor water retention performance. In addition, in recent years, composite cured materials based on high molecular polymers have been attracting attention because of their good water retention and certain cementing ability. However, the existing materials often have the problems of single component, low matching degree of the structure and the red soil, limited long-term stability and mechanical enhancement effect, high raw material cost, complex preparation process and the like, and limit the large-scale engineering application of the materials. Therefore, the development of the high-performance composite curing material which has moderate cost, simple and convenient preparation, can synergistically improve the disintegration resistance, the mechanical strength and the water retention of the red soil and is environment-friendly is a technical problem to be solved urgently at present. Disclosure of Invention The invention aims to provide a hydrogel-cellulose composite curing material for disintegrated red soil and a preparation method thereof, wherein the composite curing material can enhance the agglomeration stability and the anti-disintegration capability of the red soil, improve the mechanical strength of soil body and has the advantages of environment-friendly preparation process. The hydrogel-cellulose composite curing material for the disintegrating red soil comprises, by weight, 10-20 parts of sodium carboxymethyl cellulose, 8-15 parts of acrylic acid, 5-12 parts of acrylamide, 0.1-0.5 part of N, N' -methylenebisacrylamide, 0.2-0.8 part of potassium persulfate, 3-8 parts of sodium hydroxide and 2-6 parts of nano montmorillonite, wherein the particle size of the nano montmorillonite is 50-100nm. Preferably, the modified nano montmorillonite comprises, by weight, 12-18 parts of sodium carboxymethylcellulose, 10-13 parts of acrylic acid, 7-10 parts of acrylamide, 0.2-0.4 part of N, N' -methylenebisacrylamide, 0.4-0.6 part of potassium persulfate, 4-6 parts of sodium hydroxide and 3-5 parts of nano montmorillonite. The invention also provides application of the hydrogel-cellulose composite curing material for the disintegrated red soil in the protection of the disintegrated red soil side slope, the soil erosion control or the roadbed reinforcement. The invention also provides a preparation method of the hydrogel-cellulose composite curing material for the disintegrating red soil, which takes modified cellulose as a skeleton base material and is prepared by in-situ polymerization grafting of a hydrogel network, and specifically comprises the following steps: s1, dissolving sodium carboxymethyl cellulose in water, stirring until the sodium carboxymethyl cellulose is completely dissolved, adding nano montmorillonite, and performing ultrasonic dispersion to obtain a mixed solution A; s2, adding acrylic acid into a reaction container, stirring and dropwise adding sodium hydroxide solution to adjust the pH, then adding acrylamide and N, N '-methylenebisacrylamide, and stirring until the acrylamide and the N, N' -methylenebisacrylamide are completely dissolved to obtain a mixed solution B; S3, adding the mixed solution B obtained in the step S2 into th