CN114478944A - Environment-friendly water-retaining agent for saline-alkali soil and preparation method thereof - Google Patents
Environment-friendly water-retaining agent for saline-alkali soil and preparation method thereof Download PDFInfo
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- CN114478944A CN114478944A CN202210106796.3A CN202210106796A CN114478944A CN 114478944 A CN114478944 A CN 114478944A CN 202210106796 A CN202210106796 A CN 202210106796A CN 114478944 A CN114478944 A CN 114478944A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 53
- 239000002689 soil Substances 0.000 title claims abstract description 28
- 239000003513 alkali Substances 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000010521 absorption reaction Methods 0.000 claims description 23
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 13
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 13
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 13
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 13
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 11
- 238000002791 soaking Methods 0.000 claims description 9
- 239000011780 sodium chloride Substances 0.000 claims description 9
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 7
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 5
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 125000003368 amide group Chemical group 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 125000001033 ether group Chemical group 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 238000000643 oven drying Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims description 3
- 239000000376 reactant Substances 0.000 claims description 3
- 229940047670 sodium acrylate Drugs 0.000 claims description 3
- 239000002352 surface water Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000005518 polymer electrolyte Substances 0.000 abstract description 2
- 230000009102 absorption Effects 0.000 description 20
- 239000000126 substance Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000003204 osmotic effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229940048053 acrylate Drugs 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000009328 dry farming Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 125000003010 ionic group Chemical group 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 125000005394 methallyl group Chemical group 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002688 soil aggregate Substances 0.000 description 1
- 239000002681 soil colloid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- -1 sulfonic groups Chemical group 0.000 description 1
- 229920000247 superabsorbent polymer Polymers 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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- 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
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
-
- 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
- C09K17/18—Prepolymers; Macromolecular compounds
- C09K17/20—Vinyl polymers
-
- 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
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention relates to an environment-friendly water-retaining agent for saline-alkali soil and a preparation method thereof. The water-retaining agent of the invention is used as a polymer electrolyte, the molecular structure of the water-retaining agent contains a large number of hydrophilic groups, and the special three-dimensional net structure enables water molecules to freely enter the interior of the water-retaining agent molecules.
Description
Technical Field
The invention relates to the technical field of water-retaining agents, in particular to an environment-friendly water-retaining agent for saline-alkali soil and a preparation method thereof.
Background
Saline-alkali soil is also called saline soil, and is generally called as saline soil and alkaline earth in a broad sense, namely the saline content in soil reaches more than 0.1% -0.2%, or the alkalinity of the soil is increased to more than 15% -20% due to the absorption of exchangeable sodium in the soil by soil colloid, so that the growth of plants is damaged. In the narrow sense, the soil is damaged by salinization and alkalization. The essence of land salinization is that soluble salt is rearranged in soil, and the soil salt is accumulated on the surface layer in a large amount so that the content of the soil salt exceeds a normal value.
The cause of salt accumulation in soil mainly includes natural factors and human factors, wherein the natural factors as internal causes mainly include: climate, terrain, soil vegetation, soil moisture changes, and the like; as an external factor, the influence on soil salinization is very serious, and particularly the secondary salinization phenomenon is caused. The saline-alkali harm of soil has gradually developed into a serious ecological environment problem affecting the dry farming areas in the world. Statistics shows that part of land in about 100 countries in the world has different degrees of salinization, and the land area damaged by the salinization is close to 10 hundred million hm2. Therefore, how to scientifically and effectively improve the saline-alkali soil is very important at the present stage.
Developing water-saving agriculture and improving the utilization rate of water are one of effective measures for guaranteeing the development of agriculture in dry regions. The water-retaining agent is a chemical water-saving high-tech drought-resistant product which is developed rapidly in recent years. The water-retaining agent has the characteristics of rapid absorption and slow release of water, and can reduce the surface area of the culture substrate and the evaporation capacity of the substrate water. The water-retaining agent can store the gravity water which can not be continuously utilized by the plants, effectively increase the water holding capacity of the matrix and improve the water utilization rate. Because the saline-alkali soil has the advantages of low organic matter content, poor physical and chemical properties and low water and fertilizer storage capacity, the water retention agent is added during the restoration of the ecological vegetation of the saline-alkali soil to realize the functions of water retention and soil moisture storage, the formation of soil aggregate structures, the reduction of water evaporation capacity and the prevention of secondary salinization.
Disclosure of Invention
The invention aims to provide an environment-friendly water-retaining agent for saline-alkali soil and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a preparation method of an environment-friendly water-retaining agent for saline-alkali soil is characterized in that sulfonic acid groups, ether groups, hydroxyl groups and amide groups are introduced into a molecular main chain of acrylic acid to prepare the environment-friendly water-retaining agent.
The water-retaining agent of the invention takes acrylate as a main monomer, hydrophilic groups such as amide groups, sulfonic groups, hydroxyl groups, ether groups and the like are introduced on a molecular chain, reasonable collocation of nonionic groups and ionic groups is realized, when a polymer meets water, the hydrophilic groups and water molecules act to stretch a polymer network, osmotic pressure is formed inside and outside the network structure due to concentration difference of ions inside and outside the network, and water molecules permeate into the network structure under the action of the osmotic pressure. And the introduction of nonionic groups improves the saline-alkali resistance of the water-retaining agent, so that the water-retaining agent can absorb water under the environment with high saline-alkali content.
It is preferable that: the adopted raw materials comprise 80-120 parts of acrylic acid according to parts by weight; 0.01-0.05 part of N, N' -methylene bisacrylamide; 10-20 parts of methyl allyl polyoxyethylene ether; 20-40 parts of 2-acrylamide-2-methylpropanesulfonic acid; 0.2-0.6 part of ammonium persulfate; 30-60 parts of sodium hydroxide; 0.1 to 0.4 portion of sodium bisulfite.
It is preferable that: weighing acrylic acid in a cold water bath, neutralizing with sodium hydroxide solution, adding 2-acrylamide-2-methylpropanesulfonic acid and methallylpolyoxyethylene ether into the neutralized acrylic acid/sodium acrylate solution, adding deionized water, and introducing N under stirring2Removing oxygen for 0.5 h; then adding an ammonium persulfate solution and an N, N' -methylene bisacrylamide solution which are prepared in advance, heating to 60-65 ℃ under stirring, preheating for 2min, dropwise adding a sodium bisulfite solution at a dropping speed of 4-5s for one drop, transferring the obtained solution into a plastic tube after dropwise adding is finished, and standing at a constant temperature for 3h to obtain gel; soaking the gel in deionized water, changing water every 6h, soaking for 2 days, washing to remove unreacted reactant, soaking in anhydrous ethanol to remove surface water, and oven drying and pulverizing in oven to obtain final product.
It is preferable that: the concentration of the sodium hydroxide solution is 20-45%.
It is preferable that: the concentration of the ammonium persulfate solution is 10-30%.
It is preferable that: the concentration of the N, N' -methylene bisacrylamide solution is 8-15%.
It is preferable that: the concentration of the sodium bisulfite solution is 10 to 30 percent.
It is preferable that: the reaction equation is as follows:
S2O8 2-→2SO4 -. (1)
an environment-friendly water-retaining agent for saline-alkali soil, which has the following structural formula:
it is preferable that: water absorption rate: 900-1400 g/g; saline absorption ratio (0.9% sodium chloride solution): 95-125 g/g; repeated water absorption times: 18-25 times; can be degraded.
Different from the physical water absorption mechanism of traditional water absorption materials such as sponge, absorbent cotton, paper pulp and the like, the water retention agent disclosed by the invention is used as a polymer electrolyte, the molecular structure of the water retention agent contains a large number of hydrophilic groups, and the special three-dimensional net structure enables water molecules to freely enter the interior of the water retention agent molecules.
It is because the chemical structure and physical structure characteristics of the water-retaining agent molecule determine that the water-retaining agent has higher water holding capacity. From the physical structure, the water retention agent molecule can absorb water molecules into the meshes of the molecular net structure thereof through the physical adsorption effect. From the chemical structure, a large number of hydrophilic groups on the molecules of the water-retaining agent can be combined with water molecules after ionization, and a large number of water molecules are absorbed through the action of chemical adsorption. The water molecules absorbed by physical adsorption have higher degree of freedom and belong to stored free water, and the water molecules absorbed by chemical adsorption belong to bound water.
In general, the water absorbed in the molecules of the water-retaining agent is mostly free water. Meanwhile, the linear and body structures of the water-retaining agent molecules lead the water absorption expansion degree of the water-retaining agent molecules to have a certain limit, the water-retaining agent molecules cannot expand infinitely, as long as the linear and space structures of the water-retaining agent molecules are not damaged in the water absorption process, the water absorption capacity of the water-retaining agent molecules cannot be completely lost, and the water-retaining agent can be recycled. When the molecules of the water retention agent are contacted with moisture, the ionic network structure is shown in figure 1.
The water-retaining agent molecules added into water are ionized when contacting with water, and the electrostatic repulsion between ions makes the network structure of the water-retaining agent molecules expanded. Meanwhile, in order to maintain electric neutrality, free ions in molecules cannot diffuse into an external solvent, the difference of mass fractions inside and outside the network gradually increases, and water molecules permeate into the water-retaining agent under the action of osmotic pressure. The molecular elastic contraction force of the water-retaining agent is increased while the molecular network of the water-retaining agent is expanded, and the electrostatic repulsion among molecules is gradually eliminated, so that the water absorption balance is finally achieved.
Drawings
FIG. 1 is a graph showing the biodegradation degree trend of the water-retaining agent of example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The adopted raw materials comprise 105 parts of acrylic acid according to the parts by weight; 0.026 portion of N, N' -methylene-bisacrylamide; 15 parts of methyl allyl polyoxyethylene ether; 30 parts of 2-acrylamide-2-methylpropanesulfonic acid; 0.33 part of ammonium persulfate; 58 parts of sodium hydroxide; 0.15 part of sodium bisulfite. The concentration of the sodium hydroxide solution is 30%. The concentration of the ammonium persulfate solution is 10 percent. The concentration of the N, N' -methylene-bisacrylamide solution was 8%. The concentration of the sodium bisulfite solution is 10%.
Weighing acrylic acid in a cold water bath, neutralizing with sodium hydroxide solution, adding 2-acrylamide-2-methylpropanesulfonic acid and methallyl polyoxyethylene ether into the neutralized acrylic acid/sodium acrylate solution, adding deionized water, and introducing N under stirring2Removing oxygen for 0.5 h; then adding the ammonium persulfate solution and the N, N' -methylene-bisacrylamide solution which are prepared in advance, heating to 60-65 ℃ under stirring, preheating for 2min,dropwise adding sodium bisulfite solution at the dropping speed of 4-5s, transferring the obtained solution into a plastic tube after dropwise adding, and standing at constant temperature for 3h to obtain gel; soaking the gel in deionized water, changing water every 6h, soaking for 2 days, washing to remove unreacted reactant, soaking in anhydrous ethanol to remove surface water, and oven drying and pulverizing in oven to obtain final product.
Example 2
The adopted raw materials comprise 80 parts of acrylic acid by weight; 0.01 part of N, N' -methylene bisacrylamide; 20 parts of methyl allyl polyoxyethylene ether; 40 parts of 2-acrylamide-2-methylpropanesulfonic acid; 0.6 part of ammonium persulfate; 30 parts of sodium hydroxide; 0.3 part of sodium bisulfite. The concentration of the sodium hydroxide solution was 20%. The concentration of the ammonium persulfate solution is 30 percent. The concentration of the N, N' -methylene-bisacrylamide solution was 8%. The concentration of the sodium bisulfite solution is 10%.
The preparation method is the same as example 1.
Example 3
The adopted raw materials comprise 120 parts of acrylic acid according to parts by weight; 0.05 part of N, N' -methylene bisacrylamide; 10 parts of methyl allyl polyoxyethylene ether; 20 parts of 2-acrylamide-2-methylpropanesulfonic acid; 0.2 part of ammonium persulfate; 60 parts of sodium hydroxide; 0.1 part of sodium bisulfite. The concentration of the sodium hydroxide solution was 45%. The concentration of the ammonium persulfate solution is 30 percent. The concentration of the N, N' -methylene-bisacrylamide solution was 15%. The concentration of the sodium bisulfite solution is 10%.
The preparation method is the same as example 1.
Detection 1:
the test is carried out according to the detection method of the water retention property of the water retention agent in national standard NY668-2016 agriculture and forestry water retention agent, and the result is shown in the table 1.
TABLE 1 index of water-absorbing capacity of water-retaining agent
And (3) detection 2: after 0.1g of water-retaining agent is saturated, the water absorption times are tested, the drying is carried out, the operation is repeated until the water absorption times are reduced to 30% of the maximum water absorption times, and the water absorption times are recorded, and the results are shown in table 2.
TABLE 2 index of water absorption times of water-retaining agent
| Index (I) | Number of repeated water absorptions |
| Example 1 | 22 |
| Example 2 | 19 |
| Example 3 | 25 |
| Common water-retaining agent on market | 13 |
And (3) detection:
the detection method comprises the following steps: international organization for standardization 14855, part 1, characterizes the biodegradability of the test material by the content of carbon dioxide in the test system, the results of which are given in table 3.
According to the test data, the biodegradability of the superabsorbent polymer samples of the examples is higher than 91.0% within 84 days. The water absorption multiplying power, the saline absorption multiplying power, the repeated water absorption times and the biodegradability are far higher than those of common water-retaining agents in the market.
TABLE 3 biodegradability index of Water-retaining agent
| Index (I) | Biodegradability |
| Example 1 | 91.0％ |
| Example 2 | 92.2％ |
| Example 3 | 91.8％ |
| Common water-retaining agent on market | 60.9％ |
Claims (10)
1. A preparation method of an environment-friendly water-retaining agent for saline-alkali soil is characterized by comprising the following steps: sulfonic group, ether group, hydroxyl group and amide group are introduced into the molecular main chain of acrylic acid to prepare the environment-friendly water-retaining agent.
2. The method of claim 1, wherein: the adopted raw materials comprise 80-120 parts of acrylic acid according to parts by weight; 0.01-0.05 part of N, N' -methylene bisacrylamide; 10-20 parts of methyl allyl polyoxyethylene ether; 20-40 parts of 2-acrylamide-2-methylpropanesulfonic acid; 0.2-0.6 part of ammonium persulfate; 30-60 parts of sodium hydroxide; 0.1 to 0.4 portion of sodium bisulfite.
3. The method of claim 1, wherein: weighing acrylic acid in a cold water bath, and performing treatment by using a sodium hydroxide solutionNeutralizing, adding 2-acrylamide-2-methylpropanesulfonic acid and methyl allyl polyoxyethylene ether into the neutralized acrylic acid/sodium acrylate solution, adding deionized water, and introducing N under stirring2Removing oxygen for 0.5 h; then adding an ammonium persulfate solution and an N, N' -methylene bisacrylamide solution which are prepared in advance, heating to 60-65 ℃ under stirring, preheating for 2min, dropwise adding a sodium bisulfite solution at a dropping speed of 4-5s for one drop, transferring the obtained solution into a plastic tube after dropwise adding is finished, and standing at a constant temperature for 3h to obtain gel; soaking the gel in deionized water, changing water every 6h, soaking for 2 days, washing to remove unreacted reactant, soaking in anhydrous ethanol to remove surface water, and oven drying and pulverizing in oven to obtain final product.
4. The method of claim 3, wherein: the concentration of the sodium hydroxide solution is 20-45%.
5. The method of claim 3, wherein: the concentration of the ammonium persulfate solution is 10-30%.
6. The method of claim 3, wherein: the concentration of the N, N' -methylene bisacrylamide solution is 8-15%.
7. The method of claim 3, wherein: the concentration of the sodium bisulfite solution is 10 to 30 percent.
8. The method of any of claims 1-7, wherein: the reaction equation is as follows:
S2O8 2-→2SO4 -. (1)
9. the utility model provides an environment-friendly water-retaining agent for saline and alkaline land which characterized in that: the structural formula is as follows:
10. the environment-friendly water-retaining agent for saline-alkali soil as claimed in claim 9, wherein: water absorption rate: 900-1400 g/g; saline absorption ratio (0.9% sodium chloride solution): 95-125 g/g; repeated water absorption times: 18-25 times; can be degraded.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104371072A (en) * | 2014-10-21 | 2015-02-25 | 中国科学院南京土壤研究所 | Preparation method of agricultural water-retaining agent |
| CN111117632A (en) * | 2019-12-24 | 2020-05-08 | 陈红喜 | Preparation method of salt-tolerant water-retaining agent |
| CN111944534A (en) * | 2020-08-18 | 2020-11-17 | 浙江工业大学 | Composite environment-friendly water-retaining agent and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104371072A (en) * | 2014-10-21 | 2015-02-25 | 中国科学院南京土壤研究所 | Preparation method of agricultural water-retaining agent |
| CN111117632A (en) * | 2019-12-24 | 2020-05-08 | 陈红喜 | Preparation method of salt-tolerant water-retaining agent |
| CN111944534A (en) * | 2020-08-18 | 2020-11-17 | 浙江工业大学 | Composite environment-friendly water-retaining agent and preparation method thereof |
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