Chitosan grafted polyacrylic acid slow-release fertilizer and preparation method thereof

By preparing chitosan-grafted polyacrylic acid slow-release fertilizer, a stable covalent network is formed by using sulfonated chitosan and calcium chloride crosslinking technology. This solves the problem of the difficulty in controlling the nutrient release rate of traditional fertilizers, and improves nutrient utilization and environmental protection.

CN122145243APending Publication Date: 2026-06-05HESHAN SHANG SHANG YOU ZHI YUAN AGRICULTURAL ECOLOGY CO LTD
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Patent Information

Application Number
CN202610380122.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-26
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Traditional fertilizers have difficulty controlling the nutrient release rate and have low utilization rates, leading to resource waste and ecological environmental problems.

Method used

Chitosan-grafted polyacrylic acid slow-release fertilizer is used. By combining sulfonated chitosan with calcium chloride aqueous solution, a sulfonated chitosan-grafted polyacrylic acid copolymer network is formed. The sulfonic acid groups and calcium ions are used to crosslink a porous carrier to encapsulate the nutrient components, forming a three-dimensional covalent network to control the nutrient release rate.

Benefits of technology

It improves nutrient utilization, reduces nutrient release rate, ensures fertilizer stability during storage and transportation, and reduces resource waste and environmental pollution.

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Abstract

The invention relates to the technical field of fertilizers, and discloses a chitosan grafted polyacrylic acid slow-release fertilizer and a preparation method thereof, the chitosan grafted polyacrylic acid slow-release fertilizer is obtained by spray drying of a nutrient solution, a carrier dispersion liquid and a calcium chloride aqueous solution; the nutrient solution is obtained by mixing urea, monopotassium phosphate, zinc sulfate heptahydrate, ethylenediaminetetraacetic acid ferric sodium salt, amino acid and deionized water; the carrier dispersion liquid is obtained by mixing a porous carrier, deionized water and polyoxyethylene sorbitan monooleate; the porous carrier is prepared from sulfonated chitosan powder, deionized water, an acrylic acid neutralization solution, ammonium persulfate and N, N '-methylene bisacrylamide; the sulfonated chitosan powder is prepared from formamide, chlorosulfonic acid and chitosan powder. The release rate of nutrients can be reduced, and the utilization rate of the nutrients is improved.
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