Preparation method of degradable chemical fertilizer sustained-release material

Abstract

The invention relates to the technical field of preparation of polymer materials, in particular to a preparation method of a degradable chemical fertilizer sustained-release material. According to themethod, chitosan with high degree of deacetylation is dissolved in an acetic acid solution to obtain a chitosan membrane solution, a sodium alginate membrane solution is mixed and dispersed with thechitosan membrane solution to obtain a chitosan-polyvinyl alcohol composite membrane solution, a fermented product, urea and formaldehyde are heated to obtain a fertilizer-containing pre-polyurea aldehyde solution, finally the fertilizer-containing pre-polyurea aldehyde solution, the composite membrane solution and oxidized starch are mixed and heated, and are subjected to sedimentation after centrifugation, and a substratum glue solution is collected to obtain the degradable chemical fertilizer sustained-release material. The degradable chemical fertilizer sustained-release material providedby the invention is cross-linked by urea-formaldehyde resin and oxidized starch and does not cause secondary pollution to soil; the affinity of sodium alginate to inorganic salt fertilizer is strong,so that the stability of the sustained-release material in moist soil is improved; according to the invention, the bean straw ash is fixed in the sustained-release material, so that the sustained-release material itself has a certain fertilizer effect and has broad application prospects.

Description

Technical field [0001] The invention relates to the technical field of polymer material preparation, in particular to a preparation method of a degradable chemical fertilizer slow-release material. Background technique [0002] my country is a big country using fertilizers. Agriculture and animal husbandry production cannot be separated from fertilizers. However, traditional fertilizer particles are too small, especially in manual fertilization, which is difficult to control the amount, and the fertilizer efficiency is short, and the utilization rate is low, and the pollution is high. Alkalization and partial water pollution are closely related to the abuse of fertilizers, so manual fertilization is time-consuming and laborious. The emergence of slow- and controlled-release fertilizers has increased the utilization rate of fertilizers, is conducive to reducing environmental pollution, ensuring food security, and meeting the actual needs of farmers. [0003] Slow-release fertilizers...

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is to provide a degradable fertilizer slow-release material for the defects that the current slow-release fertilizer materials are not easy to degrade, easy to cause pollution when deposited in the soil, poor ability to control fertilizer slow-release, and low fertilizer utilization rate. Material preparation method

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