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Humic acid membrane wrapping control-releasing fertilizer

A technology of coated controlled-release fertilizer and humic acid, which is applied in the direction of fertilization equipment, fertilizer mixture, application, etc., can solve the problems of high production cost, low impact resistance, low wear resistance, and low effective nutrient content of controlled-release fertilizer. Achieve the effects of increasing microbial flora, strong abrasion resistance, and improving crop quality

Active Publication Date: 2009-02-04
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the research on thermoplastic resin and thermosetting resin-coated controlled-release fertilizers at home and abroad has developed to a relatively high level. There is a large room for improvement; it has been reported that clay minerals and industrial waste solid powder are used to wrap fertilizers with liquid binders to make controlled-release fertilizers. Although this method achieves the purpose of reducing production costs, it does not use curing agents. , leading to low impact resistance and wear resistance of the product. On the other hand, due to the use of a large amount of clay minerals and industrial waste, the effective nutrient content of the controlled-release fertilizer produced is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1, preparing humic acid-coated controlled-release fertilizer with controlled release for 2 months.

[0033] Weigh 500kg of diammonium phosphate (18-46-0) granular fertilizer, preheat to 60°C in a disc granulator (1), mix 1.12kg of 4,4'-diphenylmethane diisocyanate and 1.38kg of tung oil Evenly (2) added to the moving fertilizer particles, with the continuous movement of the fertilizer particles, a cohesive liquid layer (3) is formed on the surface, and 5 kg of air-dried and crushed weathered coal (4) weighed is scattered on the disc On the fertilizer in the granulator, continue to heat and keep the temperature at 60-70°C. With the continuous rotation of the granulator, the weathered coal powder is evenly wrapped on the surface of the fertilizer, and it can be solidified into a film after about 6 minutes (5); The amount of coating material weighed above is repeatedly wrapped 2 times on the 500kg diammonium phosphate fertilizer, and the about 4%wt of total coating...

Embodiment 2

[0034] Example 2, preparing humic acid controlled release fertilizer with controlled release for 9 months.

[0035] Weigh 500kg of Shima brand (15-15-15) granular fertilizer from BASF, Germany, preheat to 65°C in a disc granulator (1), mix 2.6kg polymethylene polyphenylisocyanate and 2.4kg soybean oil Mix evenly (2) and add to the moving fertilizer particles, as the fertilizer particles continue to move, a cohesive liquid layer (3) is formed on the surface, weigh 25 kg of lignite with a particle size of 0.08-0.25mm, air-dried and pulverized Sprinkle lignite (4) on the fertilizer in the disc granulator, continue heating to keep the temperature at 65°C, and with the continuous rotation of the granulator, the weathered coal powder is evenly wrapped on the surface of the fertilizer, and it can be solidified after about 5 minutes. Film (5); according to the amount of coating material weighed above, wrapping is repeated once, and a humic acid controlled-release fertilizer with a tot...

Embodiment 3

[0036] Example 3, preparing humic acid controlled release fertilizer with controlled release for 6 months.

[0037]Weigh 500kg of Shima brand (15-15-15) granular fertilizer from BASF, Germany, preheat it to 65°C in a disc granulator (1), mix 1.2kg polymethylene polyphenylisocyanate and 1.8kg soybean oil Mix evenly (2) and add to the moving fertilizer particles, with the continuous movement of the fertilizer particles, a cohesive liquid layer (3) is formed on the surface, and 10kg weighed air-dried and pulverized lignite (4) is sprinkled on the disc On the fertilizer in the granulator, continue to heat and keep the temperature at 60-70°C. With the continuous rotation of the granulator, the weathered coal powder is evenly wrapped on the surface of the fertilizer, and it can be solidified into a film after about 5 minutes (5); The amount of coating material weighed above is wrapped twice on 500kg Shima brand 15-15-15 fertilizer, and a humic acid controlled-release fertilizer with...

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Abstract

The invention discloses a humic acid coating controlled release fertilizer which is prepared by wrapping solid film material on the surface of fertilizer grains by using a cementing agent and a firming agent. The fertilizer is prepared according to the following steps: firstly, polyurethane resin and the firming agents such as tung oil, bean oil and linseed oil are added to the fertilizer grains which are preheated in coating equipment; secondly, humic acid solid film material is scattered to the moving fertilizer grains, heating is carried out to hold the temperature, after solidification, a shock proof and abrasion resistant coating layer is formed, thus finishing once coating; thirdly, the first step and the second step are repeated for a plurality of times in sequence, thereby preparing the humic acid coating controlled release fertilizer needed. The controlled release fertilizer has high nutrient content and the coating layer has strong shock proof and abrasion resistance property. The fertilizer can improve the chemical and physical characteristics of low productive soil; humic acid can activate nutrient, increase the content of the organic matter, quick-acting nitrogen and quick-acting phosphorus in soil and improve the proportion of solid, liquid and gas in soil.

Description

technical field [0001] The invention belongs to the technical field of controlled-release fertilizer production, and in particular relates to a humic acid-coated controlled-release fertilizer. Background technique [0002] Humic acid is a mixture of natural macromolecular aromatic and hydroxycarboxylic acids, the main elements of which are carbon, hydrogen, oxygen, nitrogen and sulfur. Humic acid has a variety of active groups (carboxyl, phenolic hydroxyl, alcoholic hydroxyl, methoxy, etc.) endowed it with a variety of functions, such as acidity, hydrophilicity, cationic exchange, complexing ability and high Adsorption capacity, etc., are based on the characteristics of humic acid. The research on it has always been concerned by people, and a lot of research has been done on its use effect. [0003] Humic acid widely exists in weathered coal and lignite. In the late 19th century, some people abroad began to use humic acid. Since the 1960s, China has been engaged in research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 万连步张晓义陈德清
Owner KINGENTA ECOLOGICAL ENG GRP
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