Material capable of controlling slow release of fertilizer

A technology of slow-release fertilizer and carbon material, applied in the field of new materials, materials for controlling slow-release of fertilizers

Active Publication Date: 2013-05-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the synthetic process problem of using polyaspartic acid and carbon spheres to synthesize a new controlled fertilizer slow-release material

Method used

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  • Material capable of controlling slow release of fertilizer
  • Material capable of controlling slow release of fertilizer
  • Material capable of controlling slow release of fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This example illustrates the synthesis method and synthesis results of carbon sphere materials.

[0049] 1) 300nm carbon spheres: configure 100mL of 0.5mol / L glucose solution, fully stir until the solution is clear, put it into a 150mL hydrothermal reaction kettle with a polytetrafluoroethylene lining, seal it, and conduct a hydrothermal reaction in an oven at 160°C for 5 hours, and the end After natural cooling, centrifuge at 15000r / min, the black carbon material was washed and centrifuged three times with purified water and ethanol respectively, and the final carbon material was obtained and dried in an oven at 80°C.

[0050] 2) 1μm carbon spheres: configure 100mL of 0.25mol / L starch solution, fully stir until the solution is clear, put it into a 150mL hydrothermal reaction kettle with a polytetrafluoroethylene lining, seal it, and conduct a hydrothermal reaction in an oven at 180°C for 5h, and the end After natural cooling, centrifuge at 15000r / min, the black carbon ...

Embodiment 2

[0055] This example illustrates the superior structure of the synthetic carbon sphere material.

[0056] The carbon spheres of Example 1 were taken for infrared spectrum characterization. The result is as figure 2 As shown, the results show that carbon spheres are rich in carbon-oxygen bonds, as well as carbon-hydrogen bonds.

Embodiment 3

[0058] This example illustrates the specific steps for the synthesis of polyaspartic acid modified carbon sphere materials.

[0059] The 300nm carbon sphere obtained in Example 1 was taken, and the polyaspartic acid modified carbon sphere material was synthesized by the following steps.

[0060] Disperse 5 g of carbon spheres in 20 times the mass of deionized water, stir at high speed for 0.5 h to form a stable suspension, add 10 g of L-aspartic acid, 2 mL of 85% H 3 PO 4 Solution, 0.05g cross-linking agent N,N-methylenebisacrylamide, ultrasonically disperse at 200 watts for 1 hour, pass N 2 protection, then raised the temperature to 180°C for 1 hour, cooled to room temperature 25°C, washed with methanol and water three times each until neutral, and dried to obtain the intermediate product.

[0061] The obtained intermediate product was crushed, hydrolyzed for 0.5h under alkaline conditions, neutralized, and then the neutralized hydrolyzed solution was slowly poured into a s...

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Abstract

The invention provides a material capable of controlling the slow release of a fertilizer. The composite material is synthesized by the following steps of: firstly, conducting hydro-thermal synthesis into carbon sphere materials by utilizing organic carbon materials with different concentrations; drying the carbon materials, evenly suspending into deionized water, conducting ultrasonic dispersion together with L-aspartic acid, a trace crosslinking agent and a catalyst under the condition of nitrogen protection, and synthesizing into an intermediate at a high temperature, flushing the intermediate to be neutral respectively with methanol and water; conducting crushing, basic hydrolysis and neutralization to the intermediate to be neutral, precipitating and filtering the neutralized hydrolysate into a sodium chloride-methanol saturated solution, flushing with methanol, and drying to obtain a polyaspartic acid-modified carbon sphere material. The material can be widely used in the field of fertilizers, and has an excellent fertilizer slow release effect.

Description

technical field [0001] The invention belongs to the field of synthesis of slow-release materials and the field of application of agricultural fertilizers, relates to a material for controlling the slow-release of fertilizers, and in particular to a new material which can be used in the field of slow-release fertilizers obtained by using polyaspartic acid modified carbon sphere materials. Background technique [0002] Sustained-release / controlled-release technology refers to the technology of taking certain measures to reduce the release rate of a certain preparation in a specific system, so as to control the effective concentration of the preparation in the system within a certain period of time. [0003] The existing controlled release technology is widely used in various fields, including medicine, agriculture, petrochemical industry, daily chemical industry and other fields. According to the purpose of its controlled release technology, the ideas of controlled release are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 余定华黄和李正文贾儒章文贵李晓栓张小伟
Owner NANJING TECH UNIV
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