CN110129071B - Lignin sand-fixing agent suitable for preventing and treating hillock erosion - Google Patents
Lignin sand-fixing agent suitable for preventing and treating hillock erosion Download PDFInfo
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- CN110129071B CN110129071B CN201910524482.3A CN201910524482A CN110129071B CN 110129071 B CN110129071 B CN 110129071B CN 201910524482 A CN201910524482 A CN 201910524482A CN 110129071 B CN110129071 B CN 110129071B
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Abstract
The invention relates to a lignin sand-fixing agent suitable for preventing and treating hillock erosion, which is prepared from the following components in parts by weight: 55-65 parts of composite binder, 18-20 parts of reinforcing agent, 15-17 parts of water-retaining agent and 5-7 parts of dispersing agent; the composite binder is prepared from 15-27 parts by weight of modified acidic lignin, 15-27 parts by weight of modified alkaline lignin and 25-30 parts by weight of polyacrylamide, the modified lignin sand fixing agent is suitable for hillock erosion areas, sulfonated and modified lignin is used as a main raw material, and the prepared lignin sand fixing agent not only has the sand fixing, erosion resistance and disintegration resistance of common sand fixing agents, but also can maintain the original ecological environment of soil.
Description
Technical Field
The invention belongs to the technical field of water and soil conservation engineering materials, and particularly relates to a lignin sand-fixing agent suitable for preventing and treating hillock erosion.
Background
The hillock is a water and soil loss phenomenon caused by hillside soil and stone bodies and scouring, is widely distributed in the south of China, causes serious farmland damage and farmland yield reduction, and is easy to cause geological disasters due to serious hillock erosion. The problem of treatment of the hillock erosion mainly lies in that the hillock erosion is high in coarse particle content and poor in soil impoverishment water-retaining property, so that the soil in a hillock erosion area is extremely easy to disintegrate, vegetation is not easy to grow and develop, and the hillock erosion is difficult to recover naturally. In addition, a large number of collapse surfaces exist in the collapse area, the collapse surfaces are often steep, and the conventional sand fixing agent product is not easy to capture, so that the sand fixing agent is difficult to apply.
The existing soil sand-fixing agent mainly aims at the soil sand-fixing agent of roads and building engineering, the sand-fixing agent can permeate into hydraulic materials such as cement, the hardening of sand soil is mainly improved, the soil can not keep the original ecological environment, and the soil sand-fixing agent is not suitable for the treatment of hilly erosion areas: chinese patent publication No. CN107032710A discloses a composite soil sand-fixation agent, and chinese patent publication No. CN107973571A discloses a soil-solidifying agent, which can improve the soil structure and the soil strength, but because the soil-solidifying agent can also permeate hydraulic materials such as cement, the soil-solidifying agent can not ensure the disintegration resistance of the soil, and can still maintain the original ecological environment of the soil.
Disclosure of Invention
The invention aims to provide a lignin sand-fixing agent suitable for preventing and controlling hillock erosion, which utilizes sulfonated and modified lignin as a main raw material, and the prepared lignin sand-fixing agent not only has the sand-fixing, erosion-resisting and disintegration-resisting performances of common sand-fixing agents, but also can maintain the original ecological environment of soil.
A lignin sand-fixing agent suitable for preventing and treating hillock erosion is prepared from the following components in parts by weight: 55-65 parts of composite binder, 18-20 parts of reinforcing agent, 15-17 parts of water-retaining agent and 5-7 parts of dispersing agent; the composite binder is prepared from 15-27 parts by weight of modified acidic lignin, 15-27 parts by weight of modified alkaline lignin and 25-30 parts by weight of polyacrylamide.
Further, the reinforcing agent is fly ash.
Further, the water-retaining agent is a composite water-retaining agent and is formed by mixing and crosslinking 8-10 parts by weight of lignosulfonate and 7-9 parts by weight of polyurethane.
Further, the dispersant is hydroxyethyl cellulose.
Further, the modified acidic lignin is prepared from the following components in parts by weight: 10-15 parts of lignosulfonate and 5-12 parts of acrylamide monomer.
Further, the modified alkaline lignin is prepared from the following components in parts by weight: 10-15 parts of lignosulfonate, 3-5 parts of formaldehyde and 3-5 parts of phenol.
A preparation method of a lignin sand-fixing agent suitable for preventing and treating hillock erosion specifically comprises the following steps:
s1, modified acid lignin: dissolving 10-15 parts of lignosulfonate in water to form 30% by mass of lignosulfonate solution, adjusting the pH of the solution to 3-4, adding 5-12 parts of acrylamide monomer, stirring uniformly, adding 1-2% by mass of hydrogen peroxide solution, heating to 90-100 ℃, reacting for more than 30min, and completely dissolving the monomer for full reaction to obtain modified acidic lignin;
s2, modified alkaline lignin: dissolving 10-15 parts of lignosulfonate in water to form 30% by mass of lignosulfonate solution, adjusting the pH of the solution to be alkaline, adding 3-5 parts of formaldehyde and 3-5 parts of phenol, and performing condensation reaction under the catalysis of alkali to generate lignin phenolic resin and a lignin-phenol condensation compound to obtain modified alkaline lignin;
s3, preparing a composite binder: taking 15-27 parts of modified acidic lignin prepared in the step S1, 15-27 parts of modified alkaline lignin prepared in the step S2 and 25-30 parts of polyacrylamide, mixing and stirring at the rotating speed of 200-300 r/min and the temperature of 50-80 ℃, and mixing and stirring for 2-3 hours to prepare the composite binder;
s4, preparing a sand fixing agent: and (4) mixing 55-65 parts of the composite binder prepared in the step S3, 18-20 parts of a reinforcing agent, 15-17 parts of a water-retaining agent and 5-7 parts of a dispersing agent, adding 100-150 parts of deionized water at normal temperature, and fully stirring for 2-3 hours at the stirring speed of 300-400r/min to prepare the lignin sand-fixing agent.
Further, the lignosulfonate is one or more of calcium lignosulfonate, sodium lignosulfonate and ammonium lignosulfonate.
Further, the water content of the composite binder prepared in the step S3 is 70-90%; the water content of the lignin sand-fixing agent prepared in the step S4 is 35-40%.
The application of the lignin sand fixing agent suitable for preventing and controlling the hillock erosion in the prevention and control project of the hillock erosion area is characterized in that the doping amount of the lignin sand fixing agent is 1.4-3% of the weight of a sand fixing target sample.
The invention has the beneficial effects that:
1. the sand-fixing agent suitable for preventing and treating the hillock erosion is prepared by taking lignin as a main raw material. Lignin is modified through sulfonation and acid-base to form a composite binder with binding power, components such as a reinforcing agent, a water-retaining agent and a dispersing agent are added on the basis, and the components in the lignin sand fixing agent play a synergistic effect in the solidified soil, so that the lignin sand fixing agent has the effects of sand fixing, erosion resistance, disintegration resistance, water retention, fertilizer retention, soil ecological environment regulation and the like, the water stability of soil bodies in a hilly region is ensured, meanwhile, vegetation growth can be promoted, the content of organic matters is increased, and further, regional ecological restoration is promoted.
2. According to the invention, acidic modification and alkaline modification are carried out on lignin, and finally the lignin is mixed to form a composite binder, the modified acidic lignin and the modified alkaline lignin in the composite binder mainly fill pores among soil particles, improve the adsorbability of soil bodies to water and increase the compactness of the soil bodies so as to improve the engineering properties of the soil bodies, the binding power is provided by rigid cementation among the soil particles on the whole, polyacrylamide has good film forming property, binding property and coagulation effect, and the generated polymer is not easy to diffuse due to the high viscosity of reaction molecules, so that the strength of the substance is increased, fine-particle soil bodies can be effectively wrapped to form aggregates, the overall strength of the soil bodies is improved, the three components in the composite binder supplement each other, and the strength and the cohesive force of the soil bodies can be greatly improved under the comprehensive action.
3. The proportion and the addition amount of the modified acidic lignin and the modified alkaline lignin in the composite binder can be adjusted according to the acid-base degree of the soil to be applied, and the soil can achieve reasonable acid-base property after being applied.
4. The invention uses the fly ash as the reinforcing agent to increase the adhesiveness of the sand fixing agent on the slope body, and the lignosulfonate and polyurethane mixed crosslinking product is used as the water-retaining agent to keep the water content of the soil and prevent the organic matters of the soil from losing, thereby having the effects of water retention and fertilizer retention.
5. The lignin sand-fixing agent prepared by the invention has good adhesiveness, can be stably attached to the surface of a slope, and is not washed and eroded by surface water.
6. The main source of the lignin used in the invention is industrial pulp waste liquid which is a pollutant, the use of the lignin is an energy-saving and environment-friendly measure for recycling solid wastes, and the treatment cost of the lignin pollutant is saved to a certain extent.
Detailed Description
In order that the invention may be better understood, reference will now be made in detail to the following examples.
Example 1
A lignin sand-fixing agent suitable for preventing and treating hillock erosion is prepared from the following components in parts by weight: 55 parts of composite binder, 18 parts of fly ash, 15 parts of water-retaining agent and 5 parts of hydroxyethyl cellulose; the composite binder is prepared from 18 parts by weight of modified acidic lignin, 25 parts by weight of modified alkaline lignin and 25 parts by weight of polyacrylamide, wherein the anionic molecular weight of the polyacrylamide is 300-2200 ten thousand.
Further, the water-retaining agent is a composite water-retaining agent and is formed by mixing and crosslinking 8 parts by weight of calcium lignosulfonate and 7 parts by weight of polyurethane.
Further, the modified acidic lignin is prepared from the following components in parts by weight: 10 parts of calcium lignosulfonate and 5 parts of acrylamide monomer.
Further, the modified alkaline lignin is prepared from the following components in parts by weight: 10 parts of calcium lignosulphonate, 3 parts of formaldehyde and 3 parts of phenol.
A preparation method of a lignin sand-fixing agent suitable for preventing and treating hillock erosion specifically comprises the following steps:
s1, modified acid lignin: dissolving 10 parts of calcium lignosulfonate in water to form a 30% calcium lignosulfonate solution by mass fraction, adjusting the pH of the solution to 3, adding 5 parts of acrylamide monomer, uniformly stirring, adding a 1% hydrogen peroxide solution by mass fraction, heating to 90 ℃, and reacting for more than 50min to completely dissolve the monomer and fully react to obtain modified acidic lignin;
s2, modified alkaline lignin: dissolving 10 parts of calcium lignosulfonate in water to form a 30% calcium lignosulfonate solution by mass fraction, adjusting the pH of the solution to be alkaline, adding 3 parts of formaldehyde and 3 parts of phenol, and carrying out condensation reaction under the catalysis of alkali to generate lignin phenolic resin and a lignin-phenol condensation compound to obtain modified alkaline lignin;
s3, preparing a composite binder: taking 18 parts of the modified acidic lignin prepared in the step S1, 25 parts of the modified alkaline lignin prepared in the step S2 and 25 parts of polyacrylamide, mixing and stirring at the rotating speed of 200r/min and the temperature of 50 ℃ for 2 hours to prepare a composite binder;
s4, preparing a sand fixing agent: and (4) mixing 55 parts of the composite binder prepared in the step S3, 18 parts of pulverized coal, 15 parts of water-retaining agent and 5 parts of hydroxyethyl cellulose, adding 110 parts of deionized water at normal temperature, and fully stirring for 2 hours at the stirring speed of 300r/min to prepare the lignin sand-fixing agent.
Example 2
A lignin sand-fixing agent suitable for preventing and treating hillock erosion is prepared from the following components in parts by weight: 60 parts of composite binder, 20 parts of fly ash, 17 parts of water-retaining agent and 6 parts of hydroxyethyl cellulose; the composite binder is prepared from 20 parts by weight of modified acidic lignin, 20 parts by weight of modified alkaline lignin and 27 parts by weight of polyacrylamide, wherein the anionic molecular weight of the polyacrylamide is 300-2200 ten thousand.
Further, the water-retaining agent is a composite water-retaining agent and is formed by mixing and crosslinking 9 parts by weight of sodium lignin sulfonate and 8 parts by weight of polyurethane.
Further, the modified acidic lignin is prepared from the following components in parts by weight: 15 parts of sodium lignosulfonate and 12 parts of acrylamide monomer.
Further, the modified alkaline lignin is prepared from the following components in parts by weight: 15 parts of sodium lignosulphonate, 5 parts of formaldehyde and 5 parts of phenol.
A preparation method of a lignin sand-fixing agent suitable for preventing and treating hillock erosion specifically comprises the following steps:
s1, modified acid lignin: dissolving 15 parts of sodium lignosulfonate in water to form a sodium lignosulfonate solution with the mass fraction of 30%, adjusting the pH value of the solution to be 4, adding 12 parts of acrylamide monomer, stirring uniformly, adding a hydrogen peroxide solution with the mass fraction of 1.5%, heating to 100 ℃, and reacting for 60min to completely dissolve the monomer and fully react to obtain modified acidic lignin;
s2, modified alkaline lignin: dissolving 15 parts of sodium lignosulfonate in water to form a sodium lignosulfonate solution with the mass fraction of 30%, adjusting the pH of the solution to be alkaline, adding 5 parts of formaldehyde and 5 parts of phenol, and carrying out condensation reaction under the catalysis of alkali to generate lignin phenolic resin and a lignin-phenol condensation compound to obtain modified alkaline lignin;
s3, preparing a composite binder: taking 20 parts of the modified acidic lignin prepared in the step S1, 20 parts of the modified alkaline lignin prepared in the step S2 and 27 parts of polyacrylamide, mixing and stirring at the rotating speed of 300r/min and the temperature of 80 ℃ for 2 hours to prepare a composite binder;
s4, preparing a sand fixing agent: and (4) mixing 60 parts of the composite binder prepared in the step S3, 20 parts of fly ash, 17 parts of water-retaining agent and 6 parts of hydroxyethyl cellulose, adding 140 parts of deionized water at normal temperature, and fully stirring for 3 hours at the stirring speed of 400r/min to prepare the lignin sand-fixing agent.
Example 3
A lignin sand-fixing agent suitable for preventing and treating hillock erosion is prepared from the following components in parts by weight: 65 parts of composite binder, 19 parts of fly ash, 16 parts of water-retaining agent and 7 parts of hydroxyethyl cellulose; the composite binder is prepared from 27 parts by weight of modified acidic lignin, 15 parts by weight of modified alkaline lignin and 15 parts by weight of polyacrylamide, wherein the anionic molecular weight of the polyacrylamide is 300-2200 ten thousand.
Further, the water-retaining agent is a composite water-retaining agent and is formed by mixing and crosslinking 10 parts by weight of ammonium lignosulfonate and 9 parts by weight of polyurethane.
Further, the modified acidic lignin is prepared from the following components in parts by weight: 12 parts of ammonium lignosulfonate and 8 parts of acrylamide monomer.
Further, the modified alkaline lignin is prepared from the following components in parts by weight: 13 parts of lignosulphonate, 4 parts of formaldehyde and 4 parts of phenol.
A preparation method of a lignin sand-fixing agent suitable for preventing and treating hillock erosion specifically comprises the following steps:
s1, modified acid lignin: dissolving 12 parts of ammonium lignosulfonate in water to form a 30% calcium lignosulfonate solution by mass fraction, adjusting the pH of the solution to 3, adding 8 parts of acrylamide monomer, stirring uniformly, adding a 2% hydrogen peroxide solution by mass fraction, heating to 95 ℃, and reacting for 40min to completely dissolve the monomer and fully react to obtain modified acidic lignin;
s2, modified alkaline lignin: dissolving 13 parts of calcium lignosulfonate in water to form a 30% calcium lignosulfonate solution by mass fraction, adjusting the pH of the solution to be alkaline, adding 4 parts of formaldehyde and 4 parts of phenol, and carrying out condensation reaction under the catalysis of alkali to generate lignin phenolic resin and a lignin-phenol condensation compound to obtain modified alkaline lignin;
s3, preparing a composite binder: taking 27 parts of modified acidic lignin prepared in the step S1, 15 parts of modified alkaline lignin prepared in the step S2 and 15 parts of polyacrylamide, mixing and stirring at the rotating speed of 250r/min and the temperature of 60 ℃ for 2 hours to prepare a composite binder;
s4, preparing a sand fixing agent: and (4) mixing 65 parts of the composite binder prepared in the step S3, 19 parts of fly ash, 16 parts of water-retaining agent and 7 parts of hydroxyethyl cellulose, adding 120 parts of deionized water at normal temperature, and fully stirring for 3 hours at the stirring speed of 350r/min to prepare the lignin sand-fixing agent.
Example 4
A lignin sand-fixing agent suitable for preventing and treating hillock erosion is prepared from the following components in parts by weight: 60 parts of composite binder, 20 parts of fly ash, 15 parts of water-retaining agent and 6 parts of hydroxyethyl cellulose; the composite binder is prepared from 22 parts by weight of modified acidic lignin, 22 parts by weight of modified alkaline lignin and 30 parts by weight of polyacrylamide.
Further, the water-retaining agent is a composite water-retaining agent and is formed by mixing and crosslinking 8-10 parts by weight of a mixture of sodium lignosulfonate and ammonium lignosulfonate and 7-9 parts by weight of polyurethane.
Further, the modified acidic lignin is prepared from the following components in parts by weight: 15 parts of a mixture of sodium lignosulfonate and ammonium lignosulfonate and 10 parts of acrylamide monomers.
Further, the modified alkaline lignin is prepared from the following components in parts by weight: 12 parts of a mixture of sodium lignosulfonate and ammonium lignosulfonate, 5 parts of formaldehyde and 3 parts of phenol.
A preparation method of a lignin sand-fixing agent suitable for preventing and treating hillock erosion specifically comprises the following steps:
s1, modified acid lignin: dissolving 15 parts of a mixture of sodium lignosulfonate and ammonium lignosulfonate in water to form a 30% lignosulfonate solution by mass fraction, adjusting the pH of the solution to 4, adding 10 parts of acrylamide monomer, stirring uniformly, adding a 2% hydrogen peroxide solution by mass fraction, heating to 100 ℃, reacting for more than 60min to completely dissolve the monomer, and reacting fully to obtain modified acidic lignin;
s2, modified alkaline lignin: dissolving 12 parts of a mixture of sodium lignosulfonate and ammonium lignosulfonate in water to form a lignosulfonate solution with the mass fraction of 30%, adjusting the pH of the solution to be alkaline, adding 5 parts of formaldehyde and 3 parts of phenol, and performing condensation reaction under the catalysis of alkali to generate lignin phenolic resin and a lignin-phenol condensation compound to obtain modified alkaline lignin;
s3, preparing a composite binder: taking 22 parts of the modified acidic lignin prepared in the step S1, 22 parts of the modified alkaline lignin prepared in the step S2 and 30 parts of polyacrylamide, mixing and stirring at the rotating speed of 300r/min and the temperature of 80 ℃, and mixing and stirring for 3 hours to prepare the composite binder;
s4, preparing a sand fixing agent: and (4) mixing 60 parts of the composite binder prepared in the step S3, 20 parts of fly ash, 15 parts of water-retaining agent and 6 parts of hydroxyethyl cellulose, adding 100 parts of deionized water at normal temperature, and fully stirring for 3 hours at the stirring speed of 400r/min to prepare the lignin sand-fixing agent.
In summary, the composite binder prepared by the embodiments 1-4 has a water content of 70-90%, and the lignin sand-fixing agent has a water content of 35-40%; when the lignin sand fixing agent prepared in the embodiment 1-4 is applied to prevention and treatment engineering of a hillock erosion area, the doping amount of the lignin sand fixing agent is 1.4-3% of the weight of a sand fixing target sample.
The invention can also be used for sand fixation engineering in similar sandy soil areas, can also be used as an additive for soil replacement in slope greening engineering, a soil body curing agent in road and dam engineering and the like, and can replace similar sand fixation agent products.
Comparative example 1
Adopting a conventional polyacrylamide curing agent, which comprises 60 parts of polyacrylamide, 19 parts of reinforcing agent and 6 parts of dispersing agent; mixing the binder, the reinforcing agent, the water-retaining agent and the dispersing agent in proportion, adding 120 parts of water at normal temperature, and stirring at the stirring speed of 300-400r/min for 2h to obtain the polyacrylamide curing agent.
Comparative example 2
Undisturbed soil body in hilllock area without addition of curing agent
Experimental test data:
1. disintegration test:
the disintegration test mainly reflects the water stability of the soil body in a water immersion state, and the good water stability is the basis of the disintegration effect of the soil body on resisting water erosion and is the embodiment of the durability of the sand fixing agent under the long-term water erosion effect. The disintegration test method comprises the following steps:
(1) and (3) adopting a soil sample on the surface layer of the collapsed wall through a cutting ring to manufacture a cylindrical soil sample with the diameter of 63.5mm and the height of 80 mm. Spraying the examples and the comparative examples on a sample, and curing at the normal temperature of about 20 ℃ for 28 days to prepare a disintegration test sample;
(2) the 4 samples were placed on 2mm mesh screens, respectively, and the mesh screens were hung under a weighing device. Quickly placing the suspended grid sieve into a glass water tank filled with water, recording the weight of a sample after the grid sieve is disintegrated, and calculating the disintegration rate;
(3) the disintegration rate was calculated as follows:
in the formula, At represents the amount (%) of disintegration of the sample At time t; r0Indicates a stable reading (cm) of the weighing apparatus at the start of the test; rt represents the scale reading (cm) of the sample at time t where the float is level.
(4) The curing effect of the curing agent can be judged according to the disintegration rate in different time periods, and the test results are as follows:
TABLE 1 disintegration test results
The test results in table 1 show that the lignin curing agent can effectively improve the stability of soil and greatly improve the disintegration time of the soil in a submerged state, so that the soil can resist surface water erosion, and has obvious advantages compared with the traditional polyacrylamide curing agent. According to the mixture ratio of the examples 2 to 4, the mixing amount of the deionized water is gradually reduced in the preparation process of the lignin sand fixing agent, 140 parts of the deionized water is mixed in the preparation process of the example 2, 120 parts of the deionized water is mixed in the preparation process of the example 3, and 100 parts of the deionized water is mixed in the preparation process of the example 4, which shows that the concentration of the lignin sand fixing agent prepared in the examples 2 to 4 is relatively increased, and the disintegration time is correspondingly increased as can be seen from the table 1, so that the curing effect is more obvious as the concentration of the lignin sand fixing agent is higher.
2. Pot experiment
The test method comprises the following steps: the plants were selected from Cynodon dactylon, Lolium perenne and Festuca arundinacea, and the above-mentioned grass seeds were sown in the soil with the curing agent of the examples to carry out the test. Wherein the seeding density of the seeds is 1 particle/cm220 seeds were sown per pot. The pot culture is cultivated in the outdoor natural state, the cultivation place belongs to subtropical monsoon climate area, the temperature is 10-30 ℃, the humidity is 50-75%, and the illumination time is about 10 h/d. The vegetation is maintained by manual watering, and is watered once every 3 days on average. The test results are as follows:
TABLE 2 potted plant test results
The test results in table 2 show that the lignin curing agent of the present invention can effectively improve the growth efficiency of plants, particularly for hero growing in the early stage of vegetation, and has obvious advantages compared with the traditional polyacrylamide curing agent. According to the proportioning of the examples, example 1 represents an alkaline sand fixing agent (the addition amount of the modified alkaline lignin is larger than that of the modified acidic lignin), example 3 represents an acidic sand fixing agent (the addition amount of the modified acidic lignin is larger than that of the modified alkaline lignin), and examples 2 and 4 represent neutral sand fixing agents. From the growth effect of plants, the bermuda grass which is relatively alkali-resistant grows relatively well in the alkaline curing agent, and the ryegrass and festuca arundinacea which are relatively acid-favored grow relatively well in the soil body of the embodiment of the acid curing agent. The neutral soil is not very different. Therefore, the pH value of the soil can be adjusted by reasonably proportioning the pH value of the soil according to the vegetation growth conditions, so that the vegetation growth can be more effectively promoted
3. And (3) field sample square test:
the test method comprises the following steps: the area of each cell of a field sample is consistent and is 30m2The gradient is 30 °. According to the protocol of the example, 1.25kg/m are used2The lignin sand-fixing agent products of examples 1 to 4 were sprayed in the amounts of the lignin sand-fixing agent of comparative example 1 and treated without spraying the lignin sand-fixing agent of the present invention, while leaving two sample plots not sprayed with the lignin sand-fixing agent of the present invention. Using 100 particles/m2The ryegrass seeds are planted at the seeding density, and are soaked for one day and evenly sowed. During the test, the rainfall value of each large rainfall in the area is monitored, the silt content in the corresponding rainfall collecting well is collected, and the average sand erosion amount of different rainfall intervals is recorded and summarized so as to evaluate the erosion conditions of different cells. The test results are as follows:
TABLE 3 field sample test results
As can be seen from the test results in Table 3, the sand production during rainfall is significantly lower in the sample plot sprayed with the lignin sand-fixing agent of examples 1-4 of the present invention than in the sample plot sprayed with the sand-fixing agent of comparative example 1 and the sample plot not sprayed with the sand-fixing agent. Therefore, the lignin curing agent can better exert the curing effect in the actual engineering practice, prevent the slope soil from being corroded by rainfall, and has obvious advantages compared with the traditional polyacrylamide curing agent.
In conclusion, the test results of the tests 1 to 3 show that the lignin sand-fixing agent has a good sand-soil-fixing effect, can improve the disintegration resistance of a soil body to a great extent, can regulate the ecological environment of the soil, retain water and fertilizer and promote the growth of vegetation on the basis, is an efficient sand-soil-fixing agent, and is suitable for preventing and treating hillock erosion areas.
The above description is only an embodiment of the present invention, and is only used to illustrate the technical solution of the present invention, and not to limit the scope of the present invention; the invention also discloses a method for manufacturing the same, which comprises the steps of carrying out the above steps of carrying.
Claims (6)
1. A lignin sand-fixation agent suitable for preventing and treating hillock erosion is characterized in that: the composition is prepared from the following components in parts by weight: 55-65 parts of composite binder, 18-20 parts of reinforcing agent, 15-17 parts of water-retaining agent, 5-7 parts of dispersing agent and 100-140 parts of deionized water; the composite binder is prepared from 15-27 parts by weight of modified acidic lignin, 15-27 parts by weight of modified alkaline lignin and 25-30 parts by weight of polyacrylamide; the modified acidic lignin is prepared from the following components in parts by weight: 10-15 parts of lignosulfonate and 5-12 parts of acrylamide monomer; the preparation method of the modified acidic lignin comprises the following steps: dissolving 10-15 parts of lignosulfonate in water to form 30% by mass of lignosulfonate solution, adjusting the pH of the solution to 3-4, adding 5-12 parts of acrylamide monomer, stirring uniformly, adding 1-2% by mass of hydrogen peroxide solution, heating to 90-100 ℃, reacting for more than 30min, and completely dissolving the monomer for full reaction to obtain modified acidic lignin; the modified alkaline lignin is prepared from the following components in parts by weight: 10-15 parts of lignosulfonate, 3-5 parts of formaldehyde and 3-5 parts of phenol; the preparation method of the modified alkaline lignin comprises the following steps: dissolving 10-15 parts of lignosulfonate in water to form 30% by mass of lignosulfonate solution, adjusting the pH of the solution to be alkaline, adding 3-5 parts of formaldehyde and 3-5 parts of phenol, and performing condensation reaction under the catalysis of alkali to generate lignin phenolic resin and a lignin-phenol condensation compound to obtain modified alkaline lignin; the reinforcing agent is fly ash; the dispersant is hydroxyethyl cellulose.
2. The lignin sand-fixation agent suitable for the prevention and treatment of flooding, according to claim 1, wherein: the water-retaining agent is a composite water-retaining agent and is formed by mixing and crosslinking 8-10 parts by weight of lignosulfonate and 7-9 parts by weight of polyurethane.
3. The preparation method of the lignin sand-fixation agent suitable for preventing and treating the collapse hillock erosion as claimed in any one of claims 1 or 2, which comprises the following steps:
s1, modified acid lignin: dissolving 10-15 parts of lignosulfonate in water to form 30% by mass of lignosulfonate solution, adjusting the pH of the solution to 3-4, adding 5-12 parts of acrylamide monomer, stirring uniformly, adding 1-2% by mass of hydrogen peroxide solution, heating to 90-100 ℃, reacting for more than 30min, and completely dissolving the monomer for full reaction to obtain modified acidic lignin;
s2, modified alkaline lignin: dissolving 10-15 parts of lignosulfonate in water to form 30% by mass of lignosulfonate solution, adjusting the pH of the solution to be alkaline, adding 3-5 parts of formaldehyde and 3-5 parts of phenol, and performing condensation reaction under the catalysis of alkali to generate lignin phenolic resin and a lignin-phenol condensation compound to obtain modified alkaline lignin;
s3, preparing a composite binder: taking 15-27 parts of modified acidic lignin prepared in the step S1, 15-27 parts of modified alkaline lignin prepared in the step S2 and 25-30 parts of polyacrylamide, mixing and stirring at the rotating speed of 200-300 r/min and the temperature of 50-80 ℃, and mixing and stirring for 2-3 hours to prepare the composite binder;
s4, preparing a sand fixing agent: and (4) mixing 55-65 parts of the composite binder prepared in the step S3, 18-20 parts of a reinforcing agent, 15-17 parts of a water-retaining agent and 5-7 parts of a dispersing agent, adding 100-140 parts of deionized water at normal temperature, and fully stirring for 2-3 hours at the stirring speed of 300-400r/min to prepare the lignin sand-fixing agent.
4. The method for preparing lignin sand-fixing agent suitable for preventing and treating hillock erosion as claimed in claim 3, wherein: the lignosulfonate is one or more of calcium lignosulfonate, sodium lignosulfonate and ammonium lignosulfonate.
5. The method for preparing lignin sand-fixing agent suitable for preventing and treating hillock erosion as claimed in claim 3, wherein: the water content of the composite binder prepared in the step S3 is 70-90%; the water content of the lignin sand-fixing agent prepared in the step S4 is 35-40%.
6. The application of the lignin sand-fixation agent suitable for preventing and treating the flooding erosion in the flooding erosion area control project of claim 1, wherein the lignin sand-fixation agent comprises the following components in percentage by weight: the doping amount of the lignin sand fixation agent is 1.4-3% of the weight of the sand fixation target sample.
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| CN115725283B (en) * | 2021-08-31 | 2024-02-13 | 中国石油化工股份有限公司 | Lignin-based composite channeling sealing agent and preparation method and application thereof |
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| CN1335351A (en) * | 2000-07-25 | 2002-02-13 | 刘海通 | Sprayed film and its application in tackling sandy waste land and plantation |
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| CN101440287B (en) * | 2007-11-22 | 2010-12-08 | 中国科学院兰州化学物理研究所 | Preparation of lignosulphonate graft copolymer chemical sand solidification agent |
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