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Coal-tar pitch-modified thermosetting resin-coated controlled-release fertilizer and production method thereof

A resin-coated, controlled-release fertilizer technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems affecting the nutrient release performance of coated controlled-release fertilizers, changes in the structure of membrane materials, and less addition, and achieves widespread promotion. Application prospects, promoting curing, reducing the effect of dosage

Inactive Publication Date: 2013-12-04
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent "Preparation Method of Modified Epoxy Resin Coated Controlled Release Fertilizer Using Spraying Urea as Undercoating" (CN1246264C) discloses a method for uniformly coating modified epoxy resin on compound fertilizer. Solvent-free, easy to prepare, and good nutrient release performance, but there is a problem of high price, so that it is difficult to popularize and apply it on crops
Although some diluents are also added to reduce the price and improve the viscosity, but the amount added is small, and these diluents are easy to migrate and change with the humidity and temperature of the surrounding environment during the entire process of nutrient release of the controlled-release fertilizer. changes, resulting in changes in the structure of the membrane material, which will eventually affect the nutrient release performance of the coated controlled-release fertilizer

Method used

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  • Coal-tar pitch-modified thermosetting resin-coated controlled-release fertilizer and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put 94 kg of urea with a diameter of 2-4 mm into the drum, heat it to 60-70 ° C, add about 1.32 kg of epoxy resin, about 0.35 kg of triethylenetetramine as a curing agent, and about 0.15 kg of coal tar pitch as a modifier kg, diluent anthracene oil about 0.26 kg, after mixing evenly, gradually add to the surface of the fertilizer particles in the drum, the drum speed is about 40 rpm, after about 5-8 minutes, the modified epoxy resin can be The surface of the fertilizer solidifies into a film. This resin coating process was repeated 3 times. Finally, the fertilizer is cooled to room temperature by a cooler, and then it can be packaged and stored. The obtained controlled-release fertilizer film accounts for about 6% of the total weight of all controlled-release fertilizers, and the controlled-release time of nutrients for this fertilizer is about 90 days in water or soil at 25°C.

Embodiment 2

[0016] Put 92 kg of granular compound fertilizer with a diameter of 2-5 mm into the drum and heat it to 60-80 °C. After mixing about 1.06 kg of epoxy resin, about 0.25 kg of curing agent triethylenetetramine, about 0.18 kg of coal tar pitch as a modifier, and 0.13 kg of diluent anthracene oil, gradually add them to the surface of the fertilizer particles in the drum, turn The rotating speed of the drum is about 40 rpm, and after about 5-8 minutes, the modified epoxy resin can be cured to form a film on the surface of the fertilizer. This epoxy resin coating process was repeated 5 times. Finally, the fertilizer is cooled to room temperature by a cooler, and then it can be packaged and stored. The obtained controlled-release film accounts for about 8% of the total weight of all controlled-release fertilizers, and the nutrient-controlled release time of the fertilizer is about 180 days in water or soil at 25°C.

Embodiment 3

[0018] Put 90 kg of granular compound fertilizer with a diameter of 2-5mm into the drum and heat it to 60-80°C. Mix about 1.13 kg of epoxy resin, about 0.28 kg of curing agent triethylenetetramine, about 0.13 kg of modifier coal tar pitch, and about 0.17 kg of diluent anthracene oil, and then gradually add them to the surface of the fertilizer particles in the drum, The rotational speed of the drum is about 40 rpm, and after about 8 minutes, the modified epoxy resin can be cured to form a film on the surface of the fertilizer. This process was repeated 6 times. Finally, the fertilizer is cooled to room temperature by a cooler, and then it can be packaged and stored. The obtained controlled-release compound fertilizer, the resin film accounts for about 10% of the total weight of all controlled-release fertilizers, and the controlled-release time of nutrients for this fertilizer is about 360 days in water or soil at 25°C.

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Abstract

The invention relates to a coal-tar pitch-modified thermosetting resin-coated controlled-release fertilizer and a production method thereof. The production method comprises the following steps of: adding low-price coal-tar pitch and anthracene oil in epoxy resin according to different ratios and uniformly mixing; gradually spraying the mixture to the preheated fertilizer particles in times; and curing the preheated fertilizer particles on site to form films and then forming modified epoxy resin-coated controlled-release fertilizer with different nutritive substances. According to the coal-tar pitch-modified thermosetting resin-coated controlled-release fertilizer disclosed by the invention, the prices of the coal-tar pitch and the anthracene oil are low, so that the prices of the modified epoxy resin-coated controlled-release fertilizer are greatly reduced and the large-area popularization and application of the modified epoxy resin-coated controlled-release fertilizer are facilitated. In addition, the coal-tar pitch has the advantages of wide sources, excellent water resistance and toughness and the like. More importantly, phenolic compounds in the coal-tar pitch can also react with an epoxy group, and thus the resin curing is further promoted and the production efficiency is increased. The release characteristics of the nutritive substances of the coal-tar pitch-modified thermosetting resin-coated controlled-release fertilizer can be adjusted according to the coating thickness and the change of the additive amount and the release period of the nutritive substances can be accurately controlled within one to twelve months.

Description

(1) Technical field [0001] The invention relates to a thermosetting resin-coated controlled-release fertilizer modified with coal tar pitch and a production method thereof. The preparation method belongs to the field of controlled-release fertilizer production. (2) Background technology [0002] Coated controlled-release fertilizer is a kind of intelligent fertilizer that can precisely control the release of nutrients. It has a flexible and changeable formula. It can regulate the dissolution and release of nutrients in the core fertilizer by adjusting the thickness and material properties of the coating, so that it can adapt to the nutrients of different crops. Demand characteristics, so as to achieve the purpose of improving fertilizer efficiency. The invention and utilization of coated controlled-release fertilizer not only improves the utilization rate of fertilizer, but also reduces the environmental pollution caused by chemical fertilizers. [0003] At present, the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/08C05G3/90
Inventor 陆盘芳张民
Owner SHANDONG AGRICULTURAL UNIVERSITY