CN115595156A - Organic polymer-biopolymer soil curing agent and preparation method thereof - Google Patents

Organic polymer-biopolymer soil curing agent and preparation method thereof Download PDF

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CN115595156A
CN115595156A CN202211313549.7A CN202211313549A CN115595156A CN 115595156 A CN115595156 A CN 115595156A CN 202211313549 A CN202211313549 A CN 202211313549A CN 115595156 A CN115595156 A CN 115595156A
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mixed slurry
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biopolymer
soil
stirring
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李江山
薛强
黄啸
陈新
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Wuhan Institute of Rock and Soil Mechanics of CAS
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Wuhan Institute of Rock and Soil Mechanics of CAS
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
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    • C09K17/32—Prepolymers; Macromolecular compounds of natural origin, e.g. cellulosic materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F261/00—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00
    • C08F261/02—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00 on to polymers of unsaturated alcohols
    • C08F261/04—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00 on to polymers of unsaturated alcohols on to polymers of vinyl alcohol
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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    • C08F265/08—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of nitriles
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    • C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
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Abstract

The invention relates to an organic macromolecule-biopolymer soil solidifying agent and a preparation method thereof, wherein acrylamide, tert-butyl acrylate, polyacrylonitrile and polyvinyl alcohol are adopted to firstly synthesize a high molecular weight organic copolymer, then polyethyleneimine, phenolic resin and N, N' -methylene bisacrylamide are added as organic cross-linking agents, the organic cross-linking agents are controlled to pre-cross-link the copolymer at a certain temperature to form partially pre-crosslinked body gel, the pre-crosslinked body gel is hardly influenced by soil properties and is not easy to generate gravity differentiation, and the adaptability, uniformity and cementation of subsequent mixing with soil are ensured; the initiator potassium persulfate, sodium persulfate and ammonium persulfate are adopted to pretreat the biopolymer lignin, artemisia glue, cellulose and chitosan, and free radicals generated by the decomposition of the initiator can activate amino functional groups contained in the biopolymer, so that the crosslinking and polymerization performance of the organic copolymer is further promoted, and the mechanical strength of the solidified soil body is enhanced.

Description

Organic polymer-biopolymer soil curing agent and preparation method thereof
Technical Field
The invention relates to the technical field of environmental geotechnical engineering, in particular to an organic polymer-biopolymer soil stabilizer and a preparation method thereof.
Background
The soil curing agent is a soil hardening agent which can be directly cemented on the surface of soil particles in a soil body at normal temperature or can react with clay minerals to generate gelled substances. The soil stabilizer is a novel green building material, can be added into soil to consolidate soil particles through physical, chemical or biological action to achieve performance indexes required by engineering, can be used for roadbed, foundation and deep soil reinforcement engineering, and is widely used in the fields of highways, railways, water conservancy, buildings and the like. The soil stabilizer has excellent performance, saves social resources, reduces the construction cost, protects the ecology, is green and energy-saving, and has good application prospect.
The soil stabilizer can be divided into calcium-based stabilizer and non-calcium-based stabilizer according to the material composition. Although the calcium-based curing agent (such as lime, portland cement, fly ash and the like) mainly comprising the traditional inorganic curing agent can obviously improve the strength and the water stability of a soil body, the ecological performance is poor, the carbon emission is high, the construction process is complex, the problems of serious soil hardening, salinization and the like are easily caused, plants basically cannot survive, and the curing performance to the soil with high organic matter content is poor, so that the calcium-based curing agent is mainly used in the field of non-ecological curing, such as roads, water conservancy, buildings and the like. With the proposal of the ecological civilization construction concept, the application scene of the soil stabilizer becomes complex, the requirements in the fields of desertification control, mine restoration, slope water and soil conservation and the like are increasing day by day, and the performance of the stabilizer also needs to be improved on the soil engineering performance and the ecological performance. Non-calcium based curing agents, represented by polymers, biological enzymes and ionic species, have been widely studied and applied.
The invention patents with publication numbers of CN105038806A and CN105602571A, respectively named as 'a macromolecular organic soil curing agent and a synthesis method thereof' and 'a polymer soil curing agent', even though the invention patents are named by macromolecular organic or polymer, relate to the use of calcium-based materials such as calcium oxide, calcium chloride, portland cement and the like, and the CN105038806A synthesis temperature is higher and needs 60-80 ℃, while the CN105602571A also needs the use of various functional components such as bonding agent, reinforcing agent, early strength agent, waterproofing agent, filling agent, water reducing agent, surfactant, dispersing agent, air entraining agent and the like, so that the preparation process is complicated, the cost is high and the environmental load is large. The invention patent of 'an organic polymer soil curing agent and a manufacturing method' with the publication number of CN112391170A takes organic matters or polymers as main components, but the synthesis process is more complicated, and particularly relates to the method that the omnipotent fungus king is fermented for 7 days at 25 ℃, the time consumption is longer, and the method is not beneficial to large-scale industrial application.
Disclosure of Invention
In view of the above, it is necessary to provide an organic polymer-biopolymer soil stabilizer and a preparation method thereof, so as to solve the problems of complex preparation process, high cost and large environmental load of the current non-calcium-based soil stabilizer.
The invention provides a preparation method of an organic polymer-biopolymer soil stabilizer, which comprises the following steps:
adding acrylamide, tert-butyl acrylate, polyacrylonitrile and polyvinyl alcohol into water, and stirring to obtain a first mixed slurry;
adding polyethyleneimine, phenolic resin and N, N' -methylene bisacrylamide into water, and stirring to obtain a second mixed slurry;
uniformly and dropwise adding the second mixed slurry into the first mixed slurry to obtain a third mixed slurry;
adding lignin, artemisia glue, cellulose and chitosan into water, and stirring to obtain a fourth mixed slurry;
adding potassium persulfate, sodium persulfate and ammonium persulfate into the fourth mixed slurry, and stirring to obtain a fifth mixed slurry;
and uniformly dropwise adding the fifth mixed slurry into the third mixed slurry to obtain the organic polymer-biopolymer composite soil stabilizer.
Optionally, the parts of acrylamide, tert-butyl acrylate, polyacrylonitrile and polyvinyl alcohol are as follows: 5-15 parts of acrylamide, 2-10 parts of tert-butyl acrylate, 1-6 parts of polyacrylonitrile and 3-8 parts of polyvinyl alcohol.
Optionally, the parts of the polyethyleneimine, the phenolic resin and the N, N' -methylene bisacrylamide are as follows: 2-6 parts of polyethyleneimine, 1-5 parts of phenolic resin and 2-8 parts of N, N' -methylene bisacrylamide.
Optionally, the lignin, the artemisia glue, the cellulose and the chitosan are in parts by weight: 3 to 9 parts of lignin, 5 to 10 parts of artemisia glue, 2 to 6 parts of cellulose and 3 to 8 parts of chitosan.
Optionally, the parts of the potassium persulfate, the sodium persulfate and the ammonium persulfate are as follows: 0.5 to 3 parts of potassium persulfate, 0.2 to 2 parts of sodium persulfate and 0.3 to 2 parts of ammonium persulfate.
Optionally, uniformly and dropwise adding the second mixed slurry into the first mixed slurry and uniformly and dropwise adding the fifth mixed slurry into the third mixed slurry are carried out by a peristaltic pump; the dropping speed of the peristaltic pump was 0.5mL/min.
Optionally, the stirring speed of the first mixed slurry obtained by stirring and the stirring speed of the second mixed slurry obtained by stirring are both 500r/min, and the stirring time is both 30min; stirring to obtain a fourth mixed slurry and stirring to obtain a fifth mixed slurry, wherein the stirring speed is 1000r/min, and the stirring time is 30min.
Optionally, the second mixed slurry is uniformly added into the first mixed slurry in a dropwise manner, and the third mixed slurry specifically includes:
uniformly dropwise adding the second mixed slurry into the first mixed slurry through a peristaltic pump;
and after the dropwise addition is finished, stirring for 30min at a stirring speed of 500r/min, and finally standing the mixed solution for 48h at the temperature of 30-60 ℃ to obtain third mixed slurry.
Optionally, the step of uniformly dropwise adding the fifth mixed slurry into the third mixed slurry to obtain the organic polymer-biopolymer soil curing agent specifically comprises:
uniformly dropwise adding the fifth mixed slurry into the third mixed slurry through a peristaltic pump;
after the dripping is finished, stirring at the speed of 500r/min to obtain the organic polymer-biopolymer soil stabilizer.
The invention also provides an organic polymer-biopolymer soil curing agent which is prepared from the following raw materials in parts by weight:
Figure BDA0003908056280000041
the invention has the beneficial effects that:
the invention adopts a compound mode of organic macromolecules and biological polymers to form three-dimensional structure cemented and wrapped soil particles, so that a compact solidified body with certain engineering mechanical strength is quickly formed. Acrylamide, tert-butyl acrylate, polyacrylonitrile and polyvinyl alcohol are adopted to firstly synthesize a high molecular weight organic copolymer, then polyethyleneimine, phenolic resin and N, N' -methylene bisacrylamide are added to serve as organic cross-linking agents, the organic cross-linking agents are controlled to pre-cross-link the copolymer at a certain temperature to form partial pre-cross-linked body gel, the pre-cross-linked body gel is hardly influenced by soil properties and is not prone to gravity differentiation, meanwhile, a large number of nucleation sites are provided without subsequent cross-linking, and the adaptability, uniformity and cementation of subsequent mixing with soil are guaranteed. The initiator potassium persulfate, sodium persulfate and ammonium persulfate are adopted to pretreat the lignin, artemisia glue, cellulose and chitosan of the biopolymer, free radicals generated by decomposition of the initiator can activate amino functional groups contained in the biopolymer, when the pretreated biopolymer is added into a part of pre-crosslinked organic high molecular solution, the pretreated biopolymer can also serve as a crosslinking agent of the organic copolymer to further promote the crosslinking and polymerization performances of the organic copolymer, and meanwhile, the biopolymer can also perform ion exchange reaction on soil particles or form intermolecular forces (hydrogen bonds and the like) to change the original structure of the soil, so that the mechanical strength of the solidified soil body is further enhanced. The organic polymer-biopolymer composite soil curing agent provided by the invention not only overcomes the problems of high carbon emission, soil hardening, salinization, difficulty in survival of plants, poor curing performance of high-organic-matter soil and the like of the traditional calcium-based curing agent, but also is simple in process preparation, easy to prepare and use in a construction site, ecological, environment-friendly, low in cost, huge in market potential and wide in engineering application prospect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method of a first embodiment of the method for preparing an organic polymer-biopolymer soil stabilizer according to the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Example one
Referring to fig. 1, a method for preparing an organic polymer-biopolymer soil stabilizer disclosed in the embodiments of the present invention includes the following steps:
s01, adding acrylamide, tert-butyl acrylate, polyacrylonitrile and polyvinyl alcohol into water, and stirring to obtain first mixed slurry; in step S01, the parts ratio of acrylamide, tert-butyl acrylate, polyacrylonitrile, polyvinyl alcohol, and water is: 5-15 parts of acrylamide, 2-10 parts of tert-butyl acrylate, 1-6 parts of polyacrylonitrile, 3-8 parts of polyvinyl alcohol and 50 parts of water. And uniformly dispersing acrylamide, tert-butyl acrylate, polyacrylonitrile and polyvinyl alcohol in water, and stirring to obtain a first mixed slurry, wherein the stirring speed is 500r/min, the stirring time is 30min, and the standing time is 24h.
S02, adding polyethyleneimine, phenolic resin and N, N' -methylene bisacrylamide into water, and stirring to obtain a second mixed slurry; in step S02, the parts ratio of polyethyleneimine, phenolic resin, N' -methylenebisacrylamide and water is: 2-6 parts of polyethyleneimine, 1-5 parts of phenolic resin, 2-8 parts of N, N' -methylene bisacrylamide and 50 parts of water. And the concrete steps are that firstly, the polyethyleneimine, the phenolic resin and the N, N' -methylene bisacrylamide are added into water, and the mixture is uniformly stirred to obtain a second mixed slurry, wherein the stirring speed is 500r/min, and the stirring time is 30min.
S03, uniformly and dropwise adding the second mixed slurry into the first mixed slurry to obtain a third mixed slurry; in the step S03, the second mixed slurry is uniformly dripped into the first mixed slurry through a peristaltic pump; the dropping speed of the peristaltic pump is 0.5mL/min, the stirring speed of 500r/min is kept for the first mixed slurry, after the dropping is finished, the stirring speed of 500r/min is continued for 30min, and finally the mixed solution is kept stand for 48h at the temperature of 30-60 ℃ to obtain third mixed slurry.
S04, adding lignin, artemisia glue, cellulose and chitosan into water, and stirring to obtain a fourth mixed slurry; in step S04, the lignin, artemisia glue, cellulose, chitosan, and water are in parts: 3 to 9 portions of lignin, 5 to 10 portions of artemisia glue, 2 to 6 portions of cellulose, 3 to 8 portions of chitosan and 50 portions of water. And uniformly dispersing lignin, artemisia glue, cellulose and chitosan in water, and stirring to obtain a fourth mixed slurry, wherein the stirring speed is 1000r/min, the stirring time is 30min, and the standing time is 24h.
S05, adding potassium persulfate, sodium persulfate and ammonium persulfate into the fourth mixed slurry, and stirring to obtain a fifth mixed slurry; in step S05, the ratio of parts of potassium persulfate, sodium persulfate and ammonium persulfate is as follows: 0.5 to 3 parts of potassium persulfate, 0.2 to 2 parts of sodium persulfate and 0.3 to 2 parts of ammonium persulfate. The method comprises the specific steps of firstly adding potassium persulfate, sodium persulfate and ammonium persulfate into the re-dispersed and uniform fourth mixed slurry, and stirring again to obtain a fifth mixed slurry, wherein the stirring speed is 1000r/min, the stirring time is 30min, and the standing time is 24h.
S06, uniformly and dropwise adding the fifth mixed slurry into the third mixed slurry to obtain an organic polymer-biopolymer composite soil curing agent; in step S06, uniformly dropwise adding the fifth mixed slurry into the third mixed slurry by using a peristaltic pump; the dropping speed of the peristaltic pump is 0.5mL/min, and after the dropping is finished, the stirring speed of the third mixed slurry is kept at 500r/min, so that the organic polymer-biopolymer composite soil curing agent is obtained.
It is understood that the dropping speed, the standing time, the stirring speed and the stirring time disclosed in the present embodiment can be selected according to actual needs, and are not limited to the parameters of the present embodiment.
The embodiment of the invention also provides an organic polymer-biopolymer composite soil curing agent which is prepared from the following raw materials in parts by weight: 5 to 15 parts of acrylamide, 2 to 10 parts of tert-butyl acrylate, 1 to 6 parts of polyacrylonitrile, 3 to 8 parts of polyvinyl alcohol, 2 to 6 parts of polyethyleneimine, 1 to 5 parts of phenolic resin, 2 to 8 parts of N, N' -methylene bisacrylamide, 3 to 9 parts of lignin, 5 to 10 parts of artemisia glue, 2 to 6 parts of cellulose, 3 to 8 parts of chitosan, 0.5 to 3 parts of potassium persulfate, 0.2 to 2 parts of sodium persulfate, 0.3 to 2 parts of ammonium persulfate and 150 parts of water.
Example two
As another embodiment of the present invention, in this embodiment, an organic polymer-biopolymer soil stabilizer and a preparation method thereof are specifically provided, including the following steps:
s01, adding acrylamide, tert-butyl acrylate, polyacrylonitrile and polyvinyl alcohol into water, and stirring to obtain first mixed slurry; in step S01, the parts ratio of acrylamide, tert-butyl acrylate, polyacrylonitrile, polyvinyl alcohol, and water is: 10 parts of acrylamide, 6 parts of tert-butyl acrylate, 3 parts of polyacrylonitrile, 4 parts of polyvinyl alcohol and 50 parts of water. And uniformly dispersing acrylamide, tert-butyl acrylate, polyacrylonitrile and polyvinyl alcohol in water, and stirring to obtain a first mixed slurry, wherein the stirring speed is 500r/min, the stirring time is 30min, and the standing time is 24h.
S02, adding polyethyleneimine, phenolic resin and N, N' -methylene bisacrylamide into water, and stirring to obtain second mixed slurry; in step S02, the parts ratio of polyethyleneimine, phenolic resin, N' -methylenebisacrylamide and water is: 4 parts of polyethyleneimine, 2 parts of phenolic resin, 4 parts of N, N' -methylene-bisacrylamide and 50 parts of water. And the concrete steps are that firstly, the polyethyleneimine, the phenolic resin and the N, N' -methylene-bisacrylamide are added into water, and the mixture is uniformly stirred to obtain a second mixed slurry, wherein the stirring speed is 500r/min, and the stirring time is 30min.
S03, uniformly and dropwise adding the second mixed slurry into the first mixed slurry to obtain a third mixed slurry; in the step S03, the second mixed slurry is uniformly dripped into the first mixed slurry through a peristaltic pump; the dropping speed of the peristaltic pump is 0.5mL/min, the stirring speed of 500r/min is kept for the first mixed slurry at this time, after the dropping is finished, the stirring speed of 500r/min is continued for 30min, and finally the mixed solution is kept stand for 48h at the temperature of 50 ℃ to obtain a third mixed slurry.
S04, adding lignin, artemisia glue, cellulose and chitosan into water, and stirring to obtain fourth mixed slurry; in step S04, the lignin, artemisia glue, cellulose, chitosan, and water are in parts: 5 parts of lignin, 6 parts of artemisia glue, 3 parts of cellulose, 5 parts of chitosan and 50 parts of water. And uniformly dispersing lignin, artemisia glue, cellulose and chitosan in water, and stirring to obtain a fourth mixed slurry, wherein the stirring speed is 1000r/min, the stirring time is 30min, and the standing time is 24h.
S05, adding potassium persulfate, sodium persulfate and ammonium persulfate into the fourth mixed slurry, and stirring to obtain a fifth mixed slurry; in step S05, the ratio of parts of potassium persulfate, sodium persulfate and ammonium persulfate is as follows: 1.0 part of potassium persulfate, 0.5 part of sodium persulfate and 0.6 part of ammonium persulfate. The method comprises the specific steps of firstly adding potassium persulfate, sodium persulfate and ammonium persulfate into the re-dispersed and uniform fourth mixed slurry, and stirring again to obtain a fifth mixed slurry, wherein the stirring speed is 1000r/min, the stirring time is 30min, and the standing time is 24h.
S06, uniformly and dropwise adding the fifth mixed slurry into the third mixed slurry to obtain an organic polymer-biopolymer composite soil curing agent; in step S06, uniformly dropwise adding the fifth mixed slurry into the third mixed slurry by using a peristaltic pump; the dropping speed of the peristaltic pump is 0.5mL/min, and after the dropping is finished, the stirring speed of the third mixed slurry is kept at 500r/min, so that the organic polymer-biopolymer composite soil curing agent is obtained.
EXAMPLE III
As another embodiment of the present invention, different from the second embodiment, in step S01 of this embodiment, the parts ratio of acrylamide, tert-butyl acrylate, polyacrylonitrile, polyvinyl alcohol, and water is: 8 parts of acrylamide, 5 parts of tert-butyl acrylate, 6 parts of polyacrylonitrile, 6 parts of polyvinyl alcohol and 50 parts of water. In step S02 of this embodiment, the parts ratio of the polyethyleneimine, the phenolic resin, the N, N' -methylenebisacrylamide and the water is: 6 parts of polyethyleneimine, 4 parts of phenolic resin, 6 parts of N, N' -methylene-bisacrylamide and 50 parts of water. In step S03 of this embodiment, the parts ratio of the lignin, artemisia glue, cellulose, chitosan, and water is: 3 parts of lignin, 5 parts of artemisia glue, 5 parts of cellulose, 3 parts of chitosan and 50 parts of water, and the standing temperature is 40 ℃. In step S04, the ratio of parts of potassium persulfate, sodium persulfate and ammonium persulfate is as follows: 0.8 part of potassium persulfate, 1.0 part of sodium persulfate and 0.5 part of ammonium persulfate.
Example four
As another embodiment of the present invention, different from the second embodiment, in step S01 of this embodiment, the parts ratio of acrylamide, tert-butyl acrylate, polyacrylonitrile, polyvinyl alcohol, and water is: 12 parts of acrylamide, 9 parts of tert-butyl acrylate, 2 parts of polyacrylonitrile, 3 parts of polyvinyl alcohol and 50 parts of water. In step S02 of this embodiment, the parts ratio of the polyethyleneimine, the phenolic resin, the N, N' -methylenebisacrylamide, and the water is: 6 parts of polyethyleneimine, 1 part of phenolic resin, 2 parts of N, N' -methylene bisacrylamide and 50 parts of water. In step S03 of this embodiment, the ratio of the lignin, artemisia glue, cellulose, chitosan, and water is: 4 parts of lignin, 8 parts of artemisia glue, 3 parts of cellulose, 7 parts of chitosan and 50 parts of water, and the standing temperature is 40 ℃. In step S04, the ratio of parts of potassium persulfate, sodium persulfate and ammonium persulfate is as follows: 1.5 parts of potassium persulfate, 0.3 part of sodium persulfate and 1.0 part of ammonium persulfate.
EXAMPLE five
As another embodiment of the present invention, different from the second embodiment, in step S01 of this embodiment, the parts ratio of acrylamide, tert-butyl acrylate, polyacrylonitrile, polyvinyl alcohol, and water is: 11 parts of acrylamide, 10 parts of tert-butyl acrylate, 3 parts of polyacrylonitrile, 5 parts of polyvinyl alcohol and 50 parts of water. In step S02 of this embodiment, the parts ratio of the polyethyleneimine, the phenolic resin, the N, N' -methylenebisacrylamide and the water is: 3 parts of polyethyleneimine, 5 parts of phenolic resin, 4 parts of N, N' -methylene-bisacrylamide and 50 parts of water. In step S03 of this embodiment, the parts ratio of the lignin, artemisia glue, cellulose, chitosan, and water is: 7 parts of lignin, 6 parts of artemisia glue, 6 parts of cellulose, 5 parts of chitosan and 50 parts of water, and the standing temperature is 55 ℃. In step S04, the ratio of parts of potassium persulfate, sodium persulfate and ammonium persulfate is as follows: 0.7 part of potassium persulfate, 0.6 part of sodium persulfate and 0.4 part of ammonium persulfate.
The organic polymer-biopolymer soil curing agent prepared in the second to fifth examples was tested according to JTG E40-2007 highway geotechnical test procedures and CJJ/T286-2018 soil curing agent application technical standards to test the mechanical strength, permeability coefficient, california Bearing Ratio (CBR), water stability coefficient and other parameters of the cured soil sample, the mixing amount of the curing agent was constant at 5%, the comparative example was a polymer curing agent in the prior art, the main component was an ethylene-vinyl acetate copolymer and the like, and the test results are shown in the following table:
performance parameter Example two EXAMPLE III Example four EXAMPLE five Comparative example
7-day unconfined strength compression (MPa) 3.52 2.79 3.85 3.27 1.05
7 days Permeability factor (cm/s) 0.54×10 -8 0.63×10 -8 0.25×10 -8 0.44×10 -8 0.49×10 -7
Water stability factor in 7 days (%) 93.51 91.66 95.83 93.97 82.13
Shear strength (kPa, axial pressure 200 kPa) 205.10 183.52 216.74 195.38 76.21
CBR(％) 11.5 12.7 13.6 10.5 3.9
As shown in the table, the unconfined compressive strength of the organic polymer-biopolymer composite soil solidified soil samples prepared in the second to fifth examples is greater than 2.5MPa in 7 days, the shear strength is close to 200kPa, the strength is more than doubled compared with that of the comparative example, and the permeability coefficient is less than 10-8cm/s and is about one order of magnitude lower than that of the comparative example. In addition, the water stability coefficient of the organic polymer-biopolymer composite soil solidified soil sample in 7 days is more than 90%, the CBR value is more than 10%, the requirements that the water stability coefficient is more than or equal to 90% and the CBR is more than or equal to 8% in JTG F10-2006 technical Specification for highway subgrade construction are met, and the qualification of the practical engineering application performance index is guaranteed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention.

Claims (10)

1. The preparation method of the organic polymer-biopolymer soil stabilizer is characterized by comprising the following steps:
adding acrylamide, tert-butyl acrylate, polyacrylonitrile and polyvinyl alcohol into water, and stirring to obtain a first mixed slurry;
adding polyethyleneimine, phenolic resin and N, N' -methylene bisacrylamide into water, and stirring to obtain second mixed slurry;
uniformly dropwise adding the second mixed slurry into the first mixed slurry to obtain a third mixed slurry;
adding lignin, artemisia glue, cellulose and chitosan into water, and stirring to obtain a fourth mixed slurry;
adding potassium persulfate, sodium persulfate and ammonium persulfate into the fourth mixed slurry, and stirring to obtain a fifth mixed slurry;
and uniformly dropwise adding the fifth mixed slurry into the third mixed slurry to obtain the organic polymer-biopolymer composite soil stabilizer.
2. The method for preparing the organic polymer-biopolymer soil solidifying agent according to claim 1, wherein the parts ratio of the acrylamide, the tert-butyl acrylate, the polyacrylonitrile and the polyvinyl alcohol is as follows: 5 to 15 portions of acrylamide, 2 to 10 portions of tert-butyl acrylate, 1 to 6 portions of polyacrylonitrile and 3 to 8 portions of polyvinyl alcohol.
3. The method for preparing the organic polymer-biopolymer soil solidifying agent according to claim 1, wherein the parts ratio of the polyethyleneimine, the phenolic resin and the N, N' -methylene bisacrylamide is as follows: 2-6 parts of polyethyleneimine, 1-5 parts of phenolic resin and 2-8 parts of N, N' -methylene bisacrylamide.
4. The method for preparing the soil stabilizer according to claim 1, wherein the lignin, the artemisia glue, the cellulose and the chitosan are prepared in the following parts: 3 to 9 parts of lignin, 5 to 10 parts of artemisia glue, 2 to 6 parts of cellulose and 3 to 8 parts of chitosan.
5. The method for preparing the organic polymer-biopolymer soil solidifying agent according to claim 1, wherein the ratio of the parts of the potassium persulfate, the sodium persulfate and the ammonium persulfate is as follows: 0.5 to 3 parts of potassium persulfate, 0.2 to 2 parts of sodium persulfate and 0.3 to 2 parts of ammonium persulfate.
6. The method for preparing an organic polymer-biopolymer soil solidifying agent according to claim 1, wherein the uniformly dropping of the second mixed slurry into the first mixed slurry and the uniformly dropping of the fifth mixed slurry into the third mixed slurry are both performed by a peristaltic pump; the dropping speed of the peristaltic pump is 0.5mL/min.
7. The method for preparing an organic polymer-biopolymer soil solidifying agent according to any one of claims 1-6, wherein the stirring speed and the stirring time for stirring the first mixed slurry and the second mixed slurry are both 500r/min and 30min; the stirring speed of the fourth mixed slurry obtained by stirring and the stirring speed of the fifth mixed slurry obtained by stirring are both 1000r/min, and the stirring time is both 30min.
8. The method for preparing an organic polymer-biopolymer soil solidifying agent according to any one of claims 1 to 6, wherein the soil solidifying agent is a mixture of the organic polymer-biopolymer soil solidifying agent and the soil solidifying agent,
the step of uniformly dropwise adding the second mixed slurry into the first mixed slurry to obtain a third mixed slurry specifically comprises the following steps:
uniformly dropwise adding the second mixed slurry into the first mixed slurry through a peristaltic pump;
and after the dropwise addition is finished, stirring for 30min at a stirring speed of 500r/min, and finally standing the mixed solution for 48h at the temperature of 30-60 ℃ to obtain third mixed slurry.
9. The method for preparing an organic polymer-biopolymer soil solidifying agent according to any one of claims 1 to 6, wherein the soil solidifying agent is a mixture of the organic polymer-biopolymer soil solidifying agent and the soil solidifying agent,
the step of uniformly dropwise adding the fifth mixed slurry into the third mixed slurry to obtain the organic polymer-biopolymer soil curing agent specifically comprises the following steps:
uniformly dropwise adding the fifth mixed slurry into the third mixed slurry through a peristaltic pump;
and after the dropwise addition is finished, stirring at the speed of 500r/min to obtain the organic polymer-biopolymer soil stabilizer.
10. The organic polymer-biopolymer soil stabilizer is characterized by being prepared from the following raw materials in parts by weight:
Figure FDA0003908056270000031
CN202211313549.7A 2022-10-25 2022-10-25 Organic polymer-biopolymer soil curing agent and preparation method thereof Pending CN115595156A (en)

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