A kind of coated degradable slow-release potassium fertilizer

Abstract

The invention discloses a coated degradation type slow release potassium fertilizer which is formed by coating a granular potassium fertilizer with a coating material, wherein the coating material occupies 2-6 percent of mass of the potassium fertilizer and is 60-140 mum in thickness; the coating material is prepared by the following method which comprises the following steps: (1) modifying soybean oil and obtaining soybean oil oligomer; (2) modifying starch and obtaining liquid starch; (3) mixing the soybean oil oligomer and the liquid starch, obtaining a mixture, then mixing with polyester resin and reacting into a film so as to obtain the coating material; the slow release period of the coating material is 30-130 days, and the coating material can be completely degraded within two years and has no residue and no pollution to the environment. The coated degradation type slow release potassium fertilizer disclosed by the invention has the advantages of degradability, low cost, long slow release period, nontoxicity, innocuity and the like.

Description

technical field [0001] The invention relates to a film-degradable slow-release potassium fertilizer, which belongs to the technical field of chemical fertilizers. Background technique [0002] At present, slow-release chemical fertilizers are the development direction of agricultural chemical fertilizers in the world. But most of the slow-release chemical fertilizer products in the prior art have the following deficiencies: 1. The coating material cannot be degraded, such as film materials such as petroleum base, epoxy resin, polyethylene, polypropylene, polyvinyl chloride, etc., thereby remaining in the soil , causing environmental pollution. 2. The coating material is poisonous, which is harmful to the health of workers during the production process. 3. The cost of coating materials is too high to be popularized. 4. The slow-release period of the film material is too short, and the effect is not good. Therefore, the development of coated degradable slow-release fertili...

AI Technical Summary

Problems solved by technology

But most of the slow-release chemical fertilizer products in the prior art have the following deficiencies: 1. The coating material cannot be degraded, such as film materials such as petroleum base, epoxy resin, polyethylene, polypropylene, polyvinyl chloride, etc., thereby remaining in the soil in, causing environmental pollution

2. The coating material is poisonous, which is harmful to the health of workers during the production process

3. The cost of coating materials is too high to be popularized

4. The sustained-release period of the film material is too short and the effect is not good

(3) Due to the direct participation of enzymes in the erosion of microorganisms, the material is decomposed or oxidized, resulting in cracking

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