Preparation method of degradable pH-responsive nano cellulose-based hydrogel slow-release fertilizer

A technology of nanocellulose and nanofibers, applied in application, nitrogen fertilizer, fertilization equipment, etc., can solve the problem that mainstream hydrogels are difficult to be degraded by microorganisms

Active Publication Date: 2021-04-27
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for preparing a degradable pH-responsive nanocellulose-based hydrogel slow-release fertilizer. The raw materials are cheap and easy to obtain, the preparation process is simple, and the operation is easy; the release amount of the fertilizer can be controlled according to the ch

Method used

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  • Preparation method of degradable pH-responsive nano cellulose-based hydrogel slow-release fertilizer
  • Preparation method of degradable pH-responsive nano cellulose-based hydrogel slow-release fertilizer
  • Preparation method of degradable pH-responsive nano cellulose-based hydrogel slow-release fertilizer

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Embodiment 1

[0034]The wheat straw powder is first activated by an air plasma instrument, wherein the voltage of the equipment is 50V, the frequency is 20-25kHz, and the flow rate is 1L / min; sodium oxide and 15wt% hydrogen peroxide) for 2 hours, then washed with distilled water and dried to obtain cellulose fiber powder. Weigh 0.075g TEMPO (2,2,6,6-tetramethylpiperidinium oxide), 0.5g sodium bromide in a 1000mL three-neck flask containing 500ml deionized water and stir to dissolve, add 5g cellulose fiber powder, 0.2mol / L HCl to adjust the pH value of sodium hypochlorite (available chlorine 12%, 5mmol / g) solution to about 10, and slowly add 28.5ml of sodium hypochlorite solution dropwise into the flask, while adjusting the pH value with 0.4mol / L NaOH The pH of the reaction system is maintained at about 10. After the sodium hypochlorite solution is dripped within 3 hours, continue to stir until the pH does not change significantly to obtain the oxidized matrix, and then use a high-speed shea...

Embodiment 2

[0036] Weigh 10 g of acrylamide, 0.5 g of 2-aminoethyl methacrylate hydrochloride, 0.45 g of amino-functionalized nanocellulose, 2.7 g of ammonium nitrate solution (concentration 8 mg / mL) and 10 mg of cross-linking agent N,N -Methylenebisacrylamide, stirring and mixing; under the protection of nitrogen, add initiator potassium persulfate (3.2mg) and 2-2'-azobis-(2-2-ylpropane hydrochloride) ( 8.14mg), and 0.045ml of catalyst 1,2-bis(dimethylamino)ethane; then pour the mixed solution into a PVA (polyvinyl alcohol) template, and copolymerize it at 40°C for 12h to obtain A granular hydrogel with a diameter of 1.4 cm; the resulting hydrogel was washed 3 times with distilled water to remove unreacted monomers in the hydrogel, and then the hydrogel was dried in an oven at 30°C for 12 hours, A degradable pH-responsive nanocellulose-based hydrogel slow-release fertilizer is obtained.

Embodiment 3

[0038] Weigh 10 g of acrylamide, 1.0 g of 2-aminoethyl methacrylate hydrochloride, 0.45 g of amino-functionalized nanocellulose, 2.9 g of ammonium nitrate solution (concentration 8 mg / mL) and 10 mg of cross-linking agent N,N -Methylenebisacrylamide, stirring and mixing; under the protection of nitrogen, add initiator potassium persulfate (3.2mg) and 2-2'-azobis-(2-2-ylpropane hydrochloride) ( 8.14mg), and 0.045ml of catalyst 1,2-bis(dimethylamino)ethane; then pour the mixed solution into a PVA (polyvinyl alcohol) template, and copolymerize it at 40°C for 12h to obtain A granular hydrogel with a diameter of 1.4 cm; the resulting hydrogel was washed 3 times with distilled water to remove unreacted monomers in the hydrogel, and then the hydrogel was dried in an oven at 30°C for 12 hours, A degradable pH-responsive nanocellulose-based hydrogel slow-release fertilizer is obtained.

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Abstract

The invention discloses a preparation method of a degradable pH-responsive nano cellulose-based hydrogel slow-release fertilizer. The degradable pH-responsive nano cellulose-based hydrogel slow-release fertilizer is prepared by reacting amino functionalized nano cellulose, acrylamide, a fertilizer solution, a monomer and a cross-linking agent, wherein the monomer is 2-amino ethyl methacrylate hydrochloride. The hydrogel slow-release fertilizer prepared by the invention can be directly mixed with crop soil, the fertilizer is adaptively released according to the change of the pH value of the soil, and the release speed and the release amount are adapted to the change of the pH value of the crop soil, so that the release of the fertilizer can be effectively slowed down, the release period of the fertilizer is prolonged, and the requirements of crops on nutrients in the whole growth period are met; the problem that mainstream hydrogel on the market is difficult to degrade by microorganisms is solved; meanwhile, more moisture can be reserved in the soil so as to meet the requirements of crop growth on the moisture; and the preparation can be completed at 30-40 DEG C, so that the energy consumption is obviously reduced.

Description

technical field [0001] The invention relates to a preparation method of a degradable pH-responsive nanocellulose-based hydrogel slow-release fertilizer, and belongs to the technical field of water-retaining slow-release fertilizers. Background technique [0002] In recent years, the application of superabsorbent hydrogels in the field of agricultural production has been extensively studied due to their unique water absorption and retention properties, and it has been confirmed that they have positive effects in regulating water and nutrients in soil. Therefore, the combination of superabsorbent hydrogel and fertilizer to prepare water-absorbing and water-retaining slow-release fertilizer not only has water-absorbing, water-retaining and drought-resistant properties, but also has slow-release properties, thereby effectively improving the utilization rate of fertilizers and reducing the effects of excessive fertilization. economic loss and environmental pollution. Moreover, w...

Claims

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Application Information

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IPC IPC(8): C05G3/40C05G3/80C05G5/18C08F251/02C08F220/56C08F220/34
CPCC05G3/40C05G3/80C05G5/18C05C1/00C08F251/02C08F220/56C08F220/34
Inventor 徐徐郭丽珍沙哈勒·希芭黄真孙鹏昊张双胜王石发
Owner NANJING FORESTRY UNIV
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