CN112279979A - Biodegradable sandy soil water and fertilizer retention agent - Google Patents
Biodegradable sandy soil water and fertilizer retention agent Download PDFInfo
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- CN112279979A CN112279979A CN202011223883.4A CN202011223883A CN112279979A CN 112279979 A CN112279979 A CN 112279979A CN 202011223883 A CN202011223883 A CN 202011223883A CN 112279979 A CN112279979 A CN 112279979A
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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
- C08F285/00—Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C11/00—Other nitrogenous fertilisers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/70—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting wettability, e.g. drying agents
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Abstract
The invention relates to the field of agriculture, in particular to a biodegradable sandy soil water and fertilizer retention agent; the invention relates to a water and fertilizer retention agent prepared by copolymerization and crosslinking of gelatin, degradable material polyvinyl alcohol and modified plant fiber powder with acrylic acid and acrylamide, wherein the surface of the modified plant fiber powder is grafted with a large amount of allyl groups and hydrophilic polyethylene glycol chain segments, so that the affinity and compatibility with synthetic materials are increased, and the possibility of increasing the addition proportion is provided; the water and fertilizer retention agent contains natural modified substances and degradable materials in a large proportion, has excellent biodegradability, has excellent water and fertilizer retention performance, is suitable for desertification soil or desert areas, and is an excellent agricultural growth aid.
Description
Technical Field
The invention relates to the field of agriculture, in particular to a biodegradable sandy soil water and fertilizer retention agent.
Background
Among the ten global environmental problems in the 21 st century, land desertification is the first place, and is regarded as a skin disease and an ulcer disease of the earth, which is one of the major environmental problems with high concern of the international society at present. China has large desertification area and wide distribution, and is one of the most serious countries in the world suffering from desertification damage. After the water-retaining agent is applied to soil, the water-retaining agent can firstly quickly absorb the water in the soil, reduce underground leakage and soil surface evaporation, reduce water loss, and can repeatedly absorb and release water, so that a 'micro reservoir' is formed in the soil, and when the water content of the soil is reduced, the water stored in the micro reservoir can be gradually released for plants to absorb and utilize.
CN101955775A discloses a biological water-retaining agent and a preparation process thereof, which utilizes a microbial strain with strong adaptability and rapid propagation speed and a high water absorption material as carriers to synthesize a novel functional water-retaining agent with water retaining function and soil improvement function. The invention has simple process and low production cost. The product of the invention can improve soil, eliminate hardening and promote the development of plant root systems; reducing the fertilizer consumption and inhibiting the propagation of harmful bacteria in soil; the effects of increasing the income and improving the quality of agricultural products are realized.
CN101906188A relates to a production process for industrially producing a water-retaining agent by hands. It is synthesized by acrylic acid, acrylamide, plant starch, cross-linking agent, initiator, alkali, stabilizer and self-initiation heating agent, can be used as water-retaining agent with drought-resisting and water-retaining functions in agriculture and forestry, can also be used as industrial high water-absorbing material, and can be used for multiple functions of perfuming, decorating, growing flowers and the like according to the action principle. It features that the self-initiating thermal agent and reasonable formula are used to make the synthetic product form product in short time under the condition of full manual operation.
CN1570005A discloses a tackifying and water-retaining agent, which is composed of sodium carboxymethyl starch, cross-linked polysaccharide acetate, konjac glucomannan and light calcium carbonate, has high bonding strength, good water retention property, no formaldehyde, no toxicity, no odor, environmental protection and neutral pH value, and an interior wall plastering material produced by the agent, gypsum and an auxiliary agent has the advantages of high bonding strength, water resistance, good construction property, environmental protection, reasonable formula and convenient use, and all substances contained in the formula interact with each other to play a good role in tackifying and retaining water.
The sandy soil has large porosity, so that the characteristics of good ventilation and water permeability, poor water retention, and small geothermal conductivity and heat capacity of the soil are determined. In addition, the nutrient substances, organic substances and part of inorganic substances of the desertification soil are poor, and the fertilizer retention capability of the soil is very poor. The fertility of desertification soil is low, the water retention and supply capacities are insufficient, the surface temperature change is strong, the soil moisture is difficult to keep balance after the crops are planted, under the normal rainfall or conventional irrigation system, the crops often cause air hole closure due to insufficient soil water supply, the moisture circulation is blocked, the photosynthesis is reduced, the productivity of an ecological system is reduced due to the reduction of the moisture production efficiency and the light energy conversion rate, and in addition, the fertility is insufficient, the grains are not harvested when the fertility is serious, so the farmland ecological system is collapsed; the water-retaining agent can solve the problems well, but the fully synthetic water-retaining agent material has poor degradability and brings about no small hidden trouble for future environmental safety. The degradable water-retaining agent in the prior art has small proportion of natural materials and poor degradation performance.
Disclosure of Invention
In order to solve the problems, the invention provides a biodegradable sandy soil water and fertilizer retention agent.
A biodegradable sandy soil water and fertilizer retention agent has the following specific scheme:
adding 2-6 parts by mass of gelatin, 8-14 parts by mass of polyvinyl alcohol and 40-55 parts by mass of modified plant fiber powder into 300 parts by mass of water at 80-100 ℃, stirring and mixing for 10-30min, then preserving heat for 10-30min, then cooling to 30-50 ℃, sequentially adding 8-15 parts by mass of acryloyloxy ethylamino polysuccinimide, 20-30 parts by mass of acrylamide and 0.5-2 parts by mass of initiator, stirring and mixing uniformly to obtain a mixed solution, reacting at a constant temperature of 72-78 ℃ for 3-8h under the protection of nitrogen, adding 0.01-0.1 part by mass of cis-3-hexenol lactate and 0.1-0.5 part by mass of initiator, stirring and mixing uniformly, continuing to react for 1-5h, filtering, recycling the filtrate, adding the product into 5-15% sodium hydroxide aqueous solution which is 5-12 times of the weight of the product, stirring for 30-60min at room temperature, filtering, washing and drying to obtain the biodegradable sandy soil water and fertilizer retention agent.
The preparation method of the modified plant fiber powder comprises the following steps:
the preparation method comprises the following steps of crushing 50-80 parts by mass of dry fibers into powder, adding the powder into a hydrolysis reactor, adding 0.05-0.2 part of sodium oleate, 0.15-0.4 part of formic acid and 0.2-0.6 part of dilute sulfuric acid into a hydrolyzer, uniformly mixing, controlling the temperature to be 55-75 ℃, carrying out hydrolysis reaction for 20-60min, discharging the materials, adding 3.4-6.8 parts of 8-16% by mass of hydrogen peroxide, reacting at 50-60 ℃ for 10-25min, then 2.6-7.2 parts of sodium bisulfite, carrying out sulfonation reaction for 20-40min, then controlling the temperature to be 50-80 ℃ by mass of 0.1-0.8 part of formaldehyde solution with the mass percentage concentration of 10-20%, 0.4-1.2 parts of sodium methacrylate, 3-8 parts of allyl alcohol polyoxyethylene ether and 1-4 parts of polyethylene glycol monomethyl ether, stirring and reacting for 30-60min to obtain the modified plant fiber powder.
The preparation method of the acryloyloxyethyl amino polysuccinimide comprises the following steps:
according to the mass portion, adding 40-60 portions of polysuccinimide into 0.6-1.2 portions of ethanolamine and 300 portions of ethyl acetate at the temperature of 50-60 ℃, stirring and reacting for 2-8h to obtain hydroxyethyl polysuccinimide, then cooling to 0-10 ℃, slowly adding 4-8 portions of acryloyl chloride into a reaction kettle, stirring for 7-11h at room temperature after the addition is finished, removing ethyl acetate by reduced pressure distillation to prepare the acryloyloxy ethylamino polysuccinimide,
acryloxyethylamino polysuccinimide, acrylamide and cis-3-hexenol lactate are subjected to cross-linking polymerization, and then hydrolyzed to obtain copolymerized aspartic acid. The equation for the partial reaction is shown below:
the hydrolysis reactor is a double-screw extruder.
The average molecular weight of the allyl alcohol polyoxyethylene ether is 1500-3000. The initiator is ammonium persulfate or potassium persulfate.
The plant fiber powder is corn straw powder, corn cob powder or wheat straw powder.
The organic solvent is ethanol or acetone.
The mass portion of the acryloyloxy ethylamino polysuccinimide is 30-45%, and the neutralization degree is 20-40%.
The biodegradable sandy soil water and fertilizer retention agent is used after being swelled in a fertilizer solution.
The invention relates to a biodegradable sandy soil water and fertilizer retention agent, which is prepared by copolymerizing and crosslinking gelatin, degradable material polyvinyl alcohol and modified plant fiber powder with acrylic acid and acrylamide, wherein the surface of the modified plant fiber powder is grafted with a large amount of allyl groups and hydrophilic polyethylene glycol chain segments, so that the affinity and compatibility with synthetic materials are improved, and the possibility of increasing the addition proportion is provided; acrylamide, acrylamide and cis-3-hexenol lactate are subjected to cross-linking polymerization, and then the obtained product is hydrolyzed to obtain copolymerized aspartic acid; the water and fertilizer retention agent contains natural modified substances and degradable materials in a large proportion, has excellent biodegradability, has excellent water and fertilizer retention performance, is suitable for desertification soil or desert areas, and is an excellent agricultural growth aid.
Drawings
FIG. 1 is a Fourier infrared spectrum of a sample of the biodegradable sandy soil water and fertilizer retention agent prepared in example 2:
at 1735cm-1An absorption peak of 1056cm was observed near the ester carbonyl group-1A symmetric telescopic absorption peak of an ester carbon-oxygen single bond exists nearby, so that the acryloyloxy-ethylamino-polysuccinimide participates in the reaction; at 903cm-1An absorption peak of ether bond at 2942cm is present in the vicinity of the probe-1The absorption peak of the carbon-hydrogen bond is in the range of 3425cm-1A stretching absorption peak of hydroxyl exists nearby, which indicates that the modified plant fiber powder participates in the reaction; at 1603cm-1The absorption peak of carbonyl of amide exists nearby, and is 1276cm-1An expansion absorption peak of the carbon-nitrogen single bond of the amide exists nearby, which indicates that the acrylamide participates in the reaction; at 1451cm-1The in-plane bending absorption peak of the hydroxyl group exists nearby, which indicates that the polyvinyl alcohol participates in the reaction.
Detailed Description
The invention is further illustrated by the following specific examples:
weighing 1.00g of super absorbent resin, soaking in 1% ammonium dihydrogen phosphate solution for 24h, filtering out residual water by using a screen, weighing, and calculating the fertilizer absorption rate. And (3) placing the water-absorbent resin after water absorption in a centrifuge for centrifugal oscillation treatment, and determining the water retention rate. Rotating at 1000r/m for about 1 min, pouring out water, weighing the residue with electronic scale, and calculating fertilizer retention rate.
Example 1
A biodegradable sandy soil water and fertilizer retention agent has the following specific scheme:
adding 2g of gelatin, 8g of polyvinyl alcohol and 40g of modified plant fiber powder into 200g of water with the temperature of 80 ℃, stirring and mixing for 10min, keeping the temperature for 10min, then cooling to 30 ℃, sequentially adding 8g of acryloyloxyethyl-amino-polysuccinimide, 20g of acrylamide and 0.5g of initiator, stirring and mixing uniformly to obtain a mixed solution, reacting at the constant temperature of 72 ℃ for 3h under the protection of nitrogen, adding 0.01g of cis-3-hexenol lactate and 0.1g of initiator, stirring and mixing uniformly, continuing to react for 1h, filtering, recycling the filtrate, adding the product into 5 parts by weight of 5% sodium hydroxide aqueous solution, stirring for 30min at room temperature, filtering, washing and drying to obtain the biodegradable sandy soil water and fertilizer retention agent.
The preparation method of the modified plant fiber powder comprises the following steps:
50g of dry fiber is crushed into powder and then added into a hydrolysis reactor, 0.05g of sodium oleate, 0.15g of formic acid and 0.2g of dilute sulfuric acid are added into a hydrolyzer, the temperature is controlled to 55 ℃ after uniform mixing, hydrolysis reaction is carried out for 20min, then the material is discharged, 3.4g of hydrogen peroxide with the mass percentage concentration of 8% is added for reaction for 10min at the temperature of 50 ℃, then 2.6g of sodium bisulfite is added for sulfonation reaction for 20min, then 0.1g of formaldehyde solution with the mass percentage concentration of 10%, 0.4g of sodium methacrylate, 3g of allyl alcohol polyoxyethylene ether and 1g of polyethylene glycol monomethyl ether are added, the temperature is controlled to 50 ℃, and stirring reaction is carried out for 30min, thus obtaining the modified plant fiber powder.
The preparation method of the acryloyloxyethyl amino polysuccinimide comprises the following steps:
adding 0.6g of ethanolamine and 200g of ethyl acetate into 40g of polysuccinimide at the temperature of 50 ℃, stirring for reacting for 2-8h to obtain hydroxyethyl polysuccinimide, then cooling to 0 ℃, slowly adding 4g of acryloyl chloride into a reaction kettle, stirring for 7h at room temperature after the addition is finished, and removing the ethyl acetate by reduced pressure distillation to obtain the acryloyloxyethyl amino polysuccinimide.
The hydrolysis reactor is a double-screw extruder.
The initiator is ammonium persulfate.
The plant fiber powder is corn straw powder.
The average molecular weight of the allyl alcohol polyoxyethylene ether is 1500.
The organic solvent is ethanol.
The mass percentage concentration of the acryloyloxyethyl-amino-polysuccinimide is 30 percent, and the neutralization degree is 20 percent.
Example 2
A biodegradable sandy soil water and fertilizer retention agent has the following specific scheme:
adding 4g of gelatin, 12g of polyvinyl alcohol and 45g of modified plant fiber powder into 250g of water with the temperature of 90 ℃, stirring and mixing for 20min, keeping the temperature for 20min, then cooling to 40 ℃, sequentially adding 12g of acryloyloxyethyl-amino-polysuccinimide, 25g of acrylamide and 1.2g of initiator, stirring and mixing uniformly to obtain a mixed solution, reacting at the constant temperature of 75 ℃ for 5h under the protection of nitrogen, adding 0.05g of cis-3-hexenol lactate and 0.3g of initiator, stirring and mixing uniformly, continuing to react for 3h, filtering, recycling the filtrate, adding the product into 9% sodium hydroxide aqueous solution with the weight of 10 times of the product, stirring for 50min at room temperature, filtering, washing and drying to obtain the biodegradable sandy soil water and fertilizer retention agent.
The preparation method of the modified plant fiber powder comprises the following steps:
crushing 60g of dry fiber into powder, adding the powder into a hydrolysis reactor, adding 0.1g of sodium oleate, 0.24g of formic acid and 0.4g of dilute sulfuric acid into a hydrolyzer, uniformly mixing, controlling the temperature to 65 ℃, carrying out hydrolysis reaction for 40min, discharging the materials, adding 4.6g of hydrogen peroxide with the mass percentage concentration of 12%, reacting for 15min at the temperature of 55 ℃, then 4.6g of sodium bisulfite, carrying out sulfonation reaction for 30min, then adding 0.4g of formaldehyde solution with the mass percentage concentration of 15%, 0.8g of sodium methacrylate, 5g of allyl alcohol polyoxyethylene ether and 2g of polyethylene glycol monomethyl ether, controlling the temperature to 60 ℃, and carrying out stirring reaction for 40min to obtain the modified plant fiber powder.
The preparation method of the acryloyloxyethyl amino polysuccinimide comprises the following steps:
adding 0.9g of ethanolamine and 240g of ethyl acetate into 45g of polysuccinimide at the temperature of 52 ℃, stirring for reacting for 4 hours to obtain hydroxyethyl polysuccinimide, then cooling to 5 ℃, slowly adding 5g of acryloyl chloride into a reaction kettle, stirring for 9 hours at room temperature after adding, distilling under reduced pressure to remove ethyl acetate to prepare acryloyloxy ethylamino polysuccinimide,
the hydrolysis reactor is a double-screw extruder.
The initiator is potassium persulfate.
The plant fiber powder is corncob powder.
The average molecular weight of the allyl alcohol polyoxyethylene ether is 2000.
The organic solvent is acetone.
The mass percentage concentration of the acryloyloxy ethylamino polysuccinimide is 35%, and the neutralization degree is 30%.
Example 3
A biodegradable sandy soil water and fertilizer retention agent has the following specific scheme:
adding 6g of gelatin, 14g of polyvinyl alcohol and 55g of modified plant fiber powder into 300g of water with the temperature of 100 ℃, stirring and mixing for 30min, keeping the temperature for 30min, then cooling to 50 ℃, sequentially adding 15g of acryloyloxyethyl-amino-polysuccinimide, 30g of acrylamide and 2g of initiator, stirring and mixing uniformly to obtain a mixed solution, reacting at the constant temperature of 78 ℃ for 8h under the protection of nitrogen, adding 0.1g of cis-3-hexenol lactate and 0.5g of initiator, stirring and mixing uniformly, continuing to react for 5h, filtering, recycling the filtrate, adding the product into 15% sodium hydroxide aqueous solution with the weight of 12 times of the product, stirring for 60min at the room temperature, filtering, washing and drying to obtain the biodegradable sandy soil water and fertilizer retention agent.
The preparation method of the modified plant fiber powder comprises the following steps:
crushing 80g of dry fibers into powder, adding the powder into a hydrolysis reactor, adding 0.2g of sodium oleate, 0.4g of formic acid and 0.6g of dilute sulfuric acid into a hydrolyzer, uniformly mixing, controlling the temperature to be 75 ℃, carrying out hydrolysis reaction for 60min, discharging the materials, adding 6.8g of 16 mass percent hydrogen peroxide, reacting for 25min at the temperature of 60 ℃, then 7.2g of sodium bisulfite, carrying out sulfonation reaction for 40min, then adding 0.8g of 20 mass percent formaldehyde solution, 1.2g of sodium methacrylate, 8g of allyl alcohol polyoxyethylene ether and 4g of polyethylene glycol monomethyl ether, controlling the temperature to be 80 ℃, and carrying out stirring reaction for 60min to obtain the modified plant fiber powder.
The preparation method of the acryloyloxyethyl amino polysuccinimide comprises the following steps:
adding 60g of polysuccinimide into 1.2g of ethanolamine and 300g of ethyl acetate at the temperature of 60 ℃, stirring for reacting for 8 hours to obtain hydroxyethyl polysuccinimide, then cooling to 10 ℃, slowly adding 8g of acryloyl chloride into a reaction kettle, stirring for 11 hours at room temperature after adding, distilling under reduced pressure to remove ethyl acetate to prepare acryloyloxy ethylamino polysuccinimide,
the hydrolysis reactor is a double-screw extruder.
The initiator is ammonium persulfate.
The plant fiber powder is wheat straw powder.
The average molecular weight of the allyl alcohol polyoxyethylene ether is 3000.
The organic solvent is acetone.
The mass percentage concentration of the acryloyloxy ethylamino polysuccinimide is 45%, and the neutralization degree is 40%.
The performance results for the water-retaining agents prepared in the above examples are shown in the following table:
| fertilizer absorption rate (g/g) | Fertilizer conservation rate (%) | |
| Example 1 | 402 | 57.1 |
| Example 2 | 416 | 62.4 |
| Example 3 | 437 | 63.8 |
Comparative example 1
A biodegradable sandy soil water and fertilizer retention agent has the following specific scheme:
adding 2g of gelatin and 8g of polyvinyl alcohol into 200g of water with the temperature of 80 ℃, stirring and mixing for 10min, keeping the temperature for 10min, then cooling to 30 ℃, sequentially adding 8g of acryloyloxyethyl-amino-polysuccinimide, 20g of acrylamide and 0.5g of initiator, stirring and mixing uniformly to obtain a mixed solution, reacting at the constant temperature of 72 ℃ for 3h under the protection of nitrogen, adding 0.01g of cis-3-hexenol lactate and 0.1g of initiator, stirring and mixing uniformly, continuing to react for 1h, filtering, recycling the filtrate, adding the product into 5 parts by weight of 5% sodium hydroxide aqueous solution, stirring at room temperature for 30min, filtering, washing and drying to obtain the biodegradable sandy soil water and fertilizer retention agent.
The preparation method of the acryloyloxyethyl amino polysuccinimide comprises the following steps:
adding 0.6g of ethanolamine and 200g of ethyl acetate into 40g of polysuccinimide at the temperature of 50 ℃, stirring for reacting for 2-8h to obtain hydroxyethyl polysuccinimide, then cooling to 0 ℃, slowly adding 4g of acryloyl chloride into a reaction kettle, stirring for 7h at room temperature after the addition is finished, and removing the ethyl acetate by reduced pressure distillation to obtain the acryloyloxyethyl amino polysuccinimide.
The initiator is ammonium persulfate.
The plant fiber powder is corn straw powder.
The organic solvent is ethanol.
The mass percentage concentration of the acryloyloxyethyl-amino-polysuccinimide is 30 percent, and the neutralization degree is 20 percent.
Comparative example 2
A biodegradable sandy soil water and fertilizer retention agent has the following specific scheme:
adding 2g of gelatin and 40g of modified plant fiber powder into 200g of water with the temperature of 80 ℃, stirring and mixing for 10min, keeping the temperature for 10min, then cooling to 30 ℃, sequentially adding 8g of acryloyloxy-acetamido-polysuccinimide, 20g of acrylamide and 0.5g of initiator, stirring and mixing uniformly to obtain a mixed solution, reacting at the constant temperature of 72 ℃ for 3h under the protection of nitrogen, adding 0.01g of cis-3-hexenol lactate and 0.1g of initiator, stirring and mixing uniformly, continuing to react for 1h, filtering, recycling the filtrate, adding the product into 5 weight parts of 5% sodium hydroxide aqueous solution, stirring for 30min at room temperature, filtering, washing and drying to obtain the biodegradable sandy soil water and fertilizer retention agent.
The preparation method of the modified plant fiber powder comprises the following steps:
50g of dry fiber is crushed into powder and then added into a hydrolysis reactor, 0.05g of sodium oleate, 0.15g of formic acid and 0.2g of dilute sulfuric acid are added into a hydrolyzer, the temperature is controlled to 55 ℃ after uniform mixing, hydrolysis reaction is carried out for 20min, then the material is discharged, 3.4g of hydrogen peroxide with the mass percentage concentration of 8% is added for reaction for 10min at the temperature of 50 ℃, then 2.6g of sodium bisulfite is added for sulfonation reaction for 20min, then 0.1g of formaldehyde solution with the mass percentage concentration of 10%, 0.4g of sodium methacrylate, 3g of allyl alcohol polyoxyethylene ether and 1g of polyethylene glycol monomethyl ether are added, the temperature is controlled to 50 ℃, and stirring reaction is carried out for 30min, thus obtaining the modified plant fiber powder.
The preparation method of the acryloyloxyethyl amino polysuccinimide comprises the following steps:
adding 0.6g of ethanolamine and 200g of ethyl acetate into 40g of polysuccinimide at the temperature of 50 ℃, stirring for reacting for 2-8h to obtain hydroxyethyl polysuccinimide, then cooling to 0 ℃, slowly adding 4g of acryloyl chloride into a reaction kettle, stirring for 7h at room temperature after the addition is finished, and removing the ethyl acetate by reduced pressure distillation to obtain the acryloyloxyethyl amino polysuccinimide.
The hydrolysis reactor is a double-screw extruder.
The initiator is ammonium persulfate.
The plant fiber powder is corn straw powder.
The average molecular weight of the allyl alcohol polyoxyethylene ether is 1500.
The organic solvent is ethanol.
The mass percentage concentration of the acryloyloxyethyl-amino-polysuccinimide is 30 percent, and the neutralization degree is 20 percent.
Comparative example 3
A biodegradable sandy soil water and fertilizer retention agent has the following specific scheme:
adding 8g of polyvinyl alcohol and 40g of modified plant fiber powder into 200g of water with the temperature of 80 ℃, stirring and mixing for 10min, keeping the temperature for 10min, then cooling to 30 ℃, sequentially adding 20g of acrylamide and 0.5g of initiator, stirring and mixing uniformly to obtain a mixed solution, reacting at the constant temperature of 72 ℃ for 3h under the protection of nitrogen, adding 0.01g of cis-3-hexenol lactate and 0.1g of initiator, stirring and mixing uniformly, continuing to react for 1h, filtering, recycling the filtrate, adding the product into 5 parts by weight of 5% sodium hydroxide aqueous solution, stirring for 30min at room temperature, filtering, washing and drying to obtain the biodegradable sandy soil water and fertilizer retention agent.
The preparation method of the modified plant fiber powder comprises the following steps:
50g of dry fiber is crushed into powder and then added into a hydrolysis reactor, 0.05g of sodium oleate, 0.15g of formic acid and 0.2g of dilute sulfuric acid are added into a hydrolyzer, the temperature is controlled to 55 ℃ after uniform mixing, hydrolysis reaction is carried out for 20min, then the material is discharged, 3.4g of hydrogen peroxide with the mass percentage concentration of 8% is added for reaction for 10min at the temperature of 50 ℃, then 2.6g of sodium bisulfite is added for sulfonation reaction for 20min, then 0.1g of formaldehyde solution with the mass percentage concentration of 10%, 0.4g of sodium methacrylate, 3g of allyl alcohol polyoxyethylene ether and 1g of polyethylene glycol monomethyl ether are added, the temperature is controlled to 50 ℃, and stirring reaction is carried out for 30min, thus obtaining the modified plant fiber powder.
The hydrolysis reactor is a double-screw extruder.
The initiator is ammonium persulfate.
The plant fiber powder is corn straw powder.
The average molecular weight of the allyl alcohol polyoxyethylene ether is 1500.
The organic solvent is ethanol.
The mass percentage concentration of the acryloyloxyethyl-amino-polysuccinimide is 30 percent, and the neutralization degree is 20 percent.
The performance results for the water-retaining agent prepared in the above comparative example are shown in the following table:
| fertilizer absorption rate (g/g) | Fertilizer conservation rate (%) | |
| Comparative example 1 | 242 | 32.7 |
| Comparative example 2 | 317 | 46.8 |
| Comparative example 3 | 283 | 39.2 |
Claims (10)
1. A biodegradable sandy soil water and fertilizer retention agent has the following specific scheme:
a biodegradable sandy soil water and fertilizer retention agent has the following specific scheme:
adding 2-6 parts by mass of gelatin, 8-14 parts by mass of polyvinyl alcohol and 40-55 parts by mass of modified plant fiber powder into 300 parts by mass of water at 80-100 ℃, stirring and mixing for 10-30min, then preserving heat for 10-30min, then cooling to 30-50 ℃, sequentially adding 8-15 parts by mass of acryloyloxy ethylamino polysuccinimide, 20-30 parts by mass of acrylamide and 0.5-2 parts by mass of initiator, stirring and mixing uniformly to obtain a mixed solution, reacting at a constant temperature of 72-78 ℃ for 3-8h under the protection of nitrogen, adding 0.01-0.1 part by mass of cis-3-hexenol lactate and 0.1-0.5 part by mass of initiator, stirring and mixing uniformly, continuing to react for 1-5h, filtering, recycling the filtrate, adding the product into 5-15% sodium hydroxide aqueous solution which is 5-12 times of the weight of the product, stirring for 30-60min at room temperature, filtering, washing and drying to obtain the biodegradable sandy soil water and fertilizer retention agent.
2. The biodegradable sandy soil water and fertilizer retention agent as claimed in claim 1, wherein: the preparation method of the modified plant fiber powder comprises the following steps:
the preparation method comprises the following steps of crushing 50-80 parts by mass of dry fibers into powder, adding the powder into a hydrolysis reactor, adding 0.05-0.2 part of sodium oleate, 0.15-0.4 part of formic acid and 0.2-0.6 part of dilute sulfuric acid into a hydrolyzer, uniformly mixing, controlling the temperature to be 55-75 ℃, carrying out hydrolysis reaction for 20-60min, discharging the materials, adding 3.4-6.8 parts of 8-16% by mass of hydrogen peroxide, reacting at 50-60 ℃ for 10-25min, then 2.6-7.2 parts of sodium bisulfite, carrying out sulfonation reaction for 20-40min, then controlling the temperature to be 50-80 ℃ by mass of 0.1-0.8 part of formaldehyde solution with the mass percentage concentration of 10-20%, 0.4-1.2 parts of sodium methacrylate, 3-8 parts of allyl alcohol polyoxyethylene ether and 1-4 parts of polyethylene glycol monomethyl ether, stirring and reacting for 30-60min to obtain the modified plant fiber powder.
3. The biodegradable sandy soil water and fertilizer retention agent as claimed in claim 2, wherein: the hydrolysis reactor is a double-screw extruder.
4. The biodegradable sandy soil water and fertilizer retention agent as claimed in claim 2, wherein: the average molecular weight of the allyl alcohol polyoxyethylene ether is 1500-3000.
5. The biodegradable sandy soil water and fertilizer retention agent as claimed in claim 1, wherein: the initiator is ammonium persulfate or potassium persulfate.
6. The biodegradable sandy soil water and fertilizer retention agent as claimed in claim 1, wherein: the plant fiber powder is corn straw powder, corn cob powder or wheat straw powder.
7. The biodegradable sandy soil water and fertilizer retention agent as claimed in claim 1, wherein: the organic solvent is ethanol or acetone.
8. The biodegradable sandy soil water and fertilizer retention agent as claimed in claim 1, wherein: the mass portion of the acryloyloxy ethylamino polysuccinimide is 30-45%, and the neutralization degree is 20-40%.
9. The biodegradable sandy soil water and fertilizer retention agent as claimed in claim 1, wherein: the biodegradable sandy soil water and fertilizer retention agent is used after being swelled in a fertilizer solution.
10. The biodegradable sandy soil water and fertilizer retention agent as claimed in claim 1, wherein: according to the mass portion, adding 40-60 portions of polysuccinimide into 0.6-1.2 portions of ethanolamine and 300 portions of ethyl acetate at 50-60 ℃, stirring and reacting for 2-8h to obtain hydroxyethyl polysuccinimide, then cooling to 0-10 ℃, slowly adding 4-8 portions of acryloyl chloride into a reaction kettle, stirring for 7-11h at room temperature after the addition is finished, and removing ethyl acetate by reduced pressure distillation to obtain the acryloyloxy ethylamino polysuccinimide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011223883.4A CN112279979A (en) | 2020-11-05 | 2020-11-05 | Biodegradable sandy soil water and fertilizer retention agent |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011223883.4A CN112279979A (en) | 2020-11-05 | 2020-11-05 | Biodegradable sandy soil water and fertilizer retention agent |
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| CN112279979A true CN112279979A (en) | 2021-01-29 |
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| CN202011223883.4A Withdrawn CN112279979A (en) | 2020-11-05 | 2020-11-05 | Biodegradable sandy soil water and fertilizer retention agent |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113024307A (en) * | 2021-03-17 | 2021-06-25 | 承德市艺风园林绿化工程有限公司 | Organic matrix for planting and preparation method and application thereof |
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2020
- 2020-11-05 CN CN202011223883.4A patent/CN112279979A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113024307A (en) * | 2021-03-17 | 2021-06-25 | 承德市艺风园林绿化工程有限公司 | Organic matrix for planting and preparation method and application thereof |
| CN113024307B (en) * | 2021-03-17 | 2023-11-10 | 承德市艺风园林绿化工程有限公司 | Organic matrix for planting and preparation method and application thereof |
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Application publication date: 20210129 |