Preparation method of slow-release fertilizer

A slow-release fertilizer, biomass coke technology, applied in nitrogen fertilizer, potash fertilizer, phosphate fertilizer and other directions, can solve the problems of unsuitable for large-scale use of farmland, unreasonable application of chemical fertilizer, complicated preparation process, etc., to promote organic integration and prevent soil erosion. , the effect of high surface activity

Inactive Publication Date: 2018-11-30
安徽省舒城久富田经济发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional chemical fertilizers face two major problems in the process of agricultural production and use: one is the large amount of chemical fertilizers used, and the utilization rate is low. The utilization rate of nitrogen fertilizer in the current season in my country is 30-35%, the utilization rate of phosphorus fertilizer is 10-25%, and the utilization rate of potassium fertilizer is 35%. -50%; Second, the use of chemical fertilizers is unreasonable. At present, the use of quick-acting fertilizers in my country is still dominated by batches of quick-acting fertilizers, with low utilization rates, short fertilizer effect cycles, high costs, and environmental pollution.
[0005] At present, the slow-release fertilizers in China are mainly coated slow-release fertilizers. Although the effect of coated slow-release fertilizers is better, their production costs are high and the preparation process is complicated. They are only suitable for plants with high economic value such as flowers and vegetables. At the same time, the coating material uses refractory polymer materials and polluting coating materials such as sulfur, paraffin, etc., which pollute farmland, so it is not suitable for large-scale use in farmland

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of slow-release fertilizer:

[0035] (1) Activation of biomass coke: place 20g of biomass coke in a sealed place at 5°C for 1 hour, then place it in an oven at 100°C to dry to constant weight, and roast it at 500°C for 1 hour to obtain activated biomass coke;

[0036] (2) Modified preparation of chitosan: put 20g of chitosan solids into the stirrer, add 10g of acetic acid solution with a mass fraction of 3%, stir until completely dissolved at 30°C; add 10g of chitosan to the acetic acid solution Toluene diisocyanate and 2g of azobisisoheptanonitrile were reacted at 75°C for 2 hours, filtered while hot, and the filter cake was washed with deionized water and absolute ethanol to remove unreacted monomers, and then dried in an oven at 100°C to constant weight. Promptly obtain modified chitosan;

[0037] (3) Preparation of slow-release fertilizer: disperse 20g of biomass coke in absolute ethanol, add 20g of modified chitosan and 4g of adsorption auxiliary agent...

Embodiment 2

[0042] (1) Activation of biomass coke: place 20g of biomass coke in a sealed place at 5°C for 1 hour, then place it in an oven at 100°C to dry to constant weight, and roast it at 500°C for 1 hour to obtain activated biomass coke;

[0043](2) Modified preparation of chitosan: put 20g of chitosan solids into the stirrer, add 10g of acetic acid solution with a mass fraction of 3%, stir until completely dissolved at 30°C; add 10g of chitosan to the acetic acid solution Toluene diisocyanate and 2g of azobisisoheptanonitrile were reacted at 75°C for 2 hours, filtered while hot, and the filter cake was washed with deionized water and absolute ethanol to remove unreacted monomers, and then dried in an oven at 100°C to constant weight. Promptly obtain modified chitosan;

[0044] (3) Preparation of slow-release fertilizer: disperse 20g of biomass coke in absolute ethanol, add 20g of modified chitosan and 3g of adsorption auxiliary agent, heat to reflux state, insulate and stir for 20min...

Embodiment 3

[0070] Based on Example 1, a comparative example 1 without modifying chitosan, a comparative example 2 using polyglutamic acid as an adsorption auxiliary agent, and a comparative example 3 without adding an adsorption auxiliary agent were set.

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Abstract

The invention discloses a preparation method of slow-release fertilizer and relates to the technical field of slow-release fertilizer. The preparation method of the slow-release fertilizer comprises the steps of activation of biomass char, modification preparation of chitosan and preparation of the slow-release fertilizer. The preparation method has the beneficial effects that diisocyanate and aninitiator are used for performing modification treatment on the chitosan, so the mechanical properties and waterproof properties of a chitosan coating material are improved; and an adsorption additiveproduced from poly-glutamic acid and glycerol by an esterification reaction can promote organic combination of the fertilizer with a carrier material, and also improve the efficiency of use of the slow-release fertilizer.

Description

Technical field: [0001] The invention relates to the technical field of slow-release fertilizers, in particular to a preparation method of slow-release fertilizers. Background technique: [0002] my country is a large agricultural country. With the continuous development of agricultural technology, agricultural production depends more and more on chemical fertilizers. At present, the amount of chemical fertilizers used in my country ranks first in the world, and it shows a trend of increasing year by year. However, traditional chemical fertilizers face two major problems in the process of agricultural production and use: one is the large amount of chemical fertilizers used, and the utilization rate is low. The utilization rate of nitrogen fertilizer in the current season in my country is 30-35%, the utilization rate of phosphorus fertilizer is 10-25%, and the utilization rate of potassium fertilizer is 35%. -50%; Second, the use of chemical fertilizers is unreasonable. At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B1/02C05G3/00C05C3/00C05C11/00C05D1/02C05D9/00C05D9/02
Inventor 任其松
Owner 安徽省舒城久富田经济发展有限责任公司
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