Coated controlled-release fertilizer using crop straws as degradable film and production method of fertilizer

A technology of crop stalks and controlled-release fertilizers, applied in fertilizer mixtures, agriculture, fertilization devices, etc., can solve problems such as difficulty in maintaining sustainable development of controlled-release fertilizers, achieve excellent nutrient release, meet growth needs, and simple preparation

Active Publication Date: 2012-11-28
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such membrane materials also have disadvantages. Their main components are petrochemical products. The high price of petrochemical products and the continuous depletion of petroleum resources make it difficult to maintain the sustainable development of controlled-release fertilizers.

Method used

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  • Coated controlled-release fertilizer using crop straws as degradable film and production method of fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 100g of diethylene glycol, 50g of wheat straw and 3g of concentrated sulfuric acid into a three-necked flask equipped with a mechanical stirrer and a condenser, and stir to make them evenly mixed. React at 140-150 DEG C for 1.5 hours, then cool in an ice-water bath to terminate the reaction, and obtain the wheat straw coating liquid. Put 500g of large granule urea with a diameter of 2-4mm into the drum, heat it to 50-70°C, then add 5.61g of wheat straw coating liquid and 3.31g of curing agent polymethylene polyphenyl polyphenylene preheated to 100°C At the same time, the isocyanate is quickly sprayed onto the surface of urea granules, and after 5-6 minutes, it can directly react and form a film on the surface of the fertilizer. This process is 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 material accounts for about 5% of the total weight o...

Embodiment 2

[0024] Add 100g of diethylene glycol, 40g of corn stalks and 3g of concentrated sulfuric acid into a three-necked flask equipped with a mechanical stirrer and a condenser, and stir to make them evenly mixed. React at 140-150 DEG C for 1.3 hours, then cool with an ice-water bath to terminate the reaction, and obtain the corn stalk coating liquid. Put 500g of large granule urea with a diameter of 2-4mm into the drum and heat it to 50-70°C; then put 5.11g of corn stalk coating solution preheated to 100°C and 3.67g of curing agent polymethylene polyphenyl The polyisocyanate is quickly sprayed onto the surface of the urea at the same time, and after 5-6 minutes, it can directly react and form a film on the surface of the fertilizer. This process is 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 material accounts for about 5% of the total weight of all contr...

Embodiment 3

[0026] Add 80g of ethylene carbonate, 20g of ethylene glycol, 40g of wheat straw and 3g of concentrated sulfuric acid into a three-necked flask equipped with a mechanical stirrer and a condenser, and stir to make them evenly mixed. React at 140-150 DEG C for 1 hour, then cool with an ice-water bath to terminate the reaction, and obtain the wheat straw coating liquid. Put 500g of large granule urea with a diameter of 2-4mm into the drum and heat it to 50-70°C; then add 5.01g of wheat straw coating solution and 3.82g of curing agent polymethylene polyphenyl polyphenylene preheated to 100°C At the same time, the isocyanate is quickly sprayed onto the surface of the urea, and after 5-6 minutes, it can directly react and form a film on the surface of the fertilizer. This process is 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 material accounts for about 5...

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Abstract

The invention relates to a coated controlled-release fertilizer using crop straws as a main coating material and a production method of the fertilizer. The method comprises the following steps of: preparing straw coating liquid from the crop straws, simultaneously spraying the straw coating liquid and a curing agent to fertilizer granules in different ratios, directly reacting, and curing into a film, and thus obtaining the straw coated controlled-release fertilizer with different water permeability. The produced coated controlled-release fertilizer has accurate nutrient release control performance, and the nutrient release control period can be controlled to be 1 to 12 months; and the film material is biodegradable. Moreover, because a waste renewable plant biomass resource, namely the crop straws is used as the film material, dependency of the coating material on petrochemical resources is reduced, and sustainable development of the coating material is realized. The fertilizer is low in prices and easy to prepare, does not require solvent, and is very suitable for large-scale production and promotion.

Description

(1) Technical field [0001] The invention relates to a coated controlled-release fertilizer using crop stalks as a degradable film and a production method thereof, belonging 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 of new fertilizers. The invention and utilization of coated controlled-release fertilizers not only improve the utilization rate of fertilizers, but also reduce the environmental pollution caused by chemical fertilizers. [0003] Coated controlled-release ferti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 张民陆盘芳
Owner SHANDONG AGRICULTURAL UNIVERSITY
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