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Preparation method of fertilizer coated with water-soluble degradable material

A degradable material and water-soluble technology, applied in layered/coated fertilizers, alkaline orthophosphate fertilizers, ammonium salt fertilizers, etc., can solve the problems of poor slow-release effect and high cost, and achieve the goal of improving slow-release performance Effect

Inactive Publication Date: 2016-08-24
MUDANJIANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Binder and chitin are used in this fertilizer, resulting in high cost and poor slow-release effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Preparation of fertilizer coated with water-soluble degradable material

[0020] step:

[0021] Step 1. Mix 50g of poly(α-malic acid) and 20g of polyethylene glycol and disperse them in 300g of chloroform. Stir at a temperature of 40°C and stir for 0.5 hours, then add 1-ethyl- (3-Dimethylaminopropyl)carbodiimide hydrochloride 5g, react while stirring, the reaction time is 35°C, the reaction time is 1 hour, and the concentrated solution is obtained;

[0022] Step 2. Add the concentrated solution to 300g of petroleum ether, filter the precipitate, wash the precipitate with water, and then dry it to obtain the matrix material. The drying time is 110°C and the drying time is 4 hours;

[0023] Step 3: Disperse 20g of urea, 10g of ammonium phosphate, and 10g of ammonium sulfate in 100g of water, then raise the temperature to 80°C, then add 30g of starch, stir evenly, cool down, the cooling temperature is 1°C, and remove the precipitated solid Filter out to obtain ...

Embodiment 2

[0025] Example 2 Preparation of fertilizer coated with water-soluble degradable material

[0026] step:

[0027] Step 1: Mix 80g of poly(α-malic acid) and 30g of polyethylene glycol and disperse them in 400g of chloroform, heat up and stir at 50°C, stir for 1 hour, then add 1-ethyl- (3-Dimethylaminopropyl)carbodiimide hydrochloride 8g, reacted while stirring, the reaction time was 45°C, the reaction time was 2 hours, and a concentrated solution was obtained;

[0028] Step 2. Add the concentrated solution to 400g of petroleum ether, filter the precipitate, wash the precipitate with water, and then dry it to obtain the matrix material. The drying time is 120°C and the drying time is 6 hours;

[0029] Step 3: Disperse 30g of urea, 20g of ammonium phosphate, and 20g of ammonium sulfate in 120g of water, then raise the temperature to 90°C, then add 40g of starch, stir evenly, cool, the cooling temperature is 3°C, and remove the precipitated solid Filter out to obtain starch-coate...

Embodiment 3

[0031] Preparation of the fertilizer coated with the water-soluble degradable material of embodiment 3

[0032] step:

[0033] Step 1. Mix 70g of poly(α-malic acid) and 25g of polyethylene glycol and disperse them in 350g of chloroform. Stir at a temperature of 45°C and stir for 0.7 hours, then add 1-ethyl- (3-Dimethylaminopropyl)carbodiimide hydrochloride 7g, reacted while stirring, the reaction time was 40°C, the reaction time was 2 hours, and the concentrated solution was obtained;

[0034] Step 2: Add the concentrated solution to 350 g of petroleum ether, filter the precipitate, wash the precipitate with water, and then dry it to obtain the matrix material. The drying time is 115 ° C and the drying time is 5 hours;

[0035] Step 3: Disperse 25g of urea, 15g of ammonium phosphate, and 15g of ammonium sulfate in 110g of water, then raise the temperature to 85°C, then add 35g of starch, stir evenly, cool down, the cooling temperature is 2°C, and remove the precipitated solid...

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Abstract

The invention relates to a preparation method for fertilizer coated with a water-soluble degradable material, and belongs to the technical field of fertilizers. The method comprises the following steps: after mixing poly (alpha-malic acid) and polyethylene glycol, dispersing the mixture to trichloromethane, performing warming and stirring, then adding 1-ethyl-(3- dimethyl aminopropyl) carbodiimide hydrochloride, and reacting in a stirring manner to obtain a concentrated solution; adding the concentrated solution to petroleum ether, filtering to obtain precipitate, washing the precipitate with water, and drying to obtain a matrix material; dispersing urea, ammonium phosphate and ammonium sulphate to water, then after warming, adding starch, uniformly stirring and cooling, and filtering out solid which is separated out to obtain fertilizer crystals coated with the starch; mixing the matrix material and the fertilizer crystals coated with the starch with the water, then dropwise adding a water solution which is prepared from cyclodextrin in a stirring manner to the water solution of the matrix material, the fertilizer crystals coated with the starch, after dropwise adding the water solution which is prepared from the cyclodextrin, performing ultrasound reaction, and after the reaction, leaving to stand to obtain the fertilizer coated with the degradable material.

Description

technical field [0001] The invention relates to a preparation method of a fertilizer coated with a water-soluble degradable material, belonging to the technical field of fertilizers. Background technique [0002] At present, the utilization rates of nitrogen, phosphorus and potassium fertilizers in my country are 30%-35%, 10%-20% and 35%-50% respectively, 10-15 percentage points lower than developed countries. On this basis, the development of controlled-release fertilizers is of great significance for reducing fertilizer consumption and environmental pollution. The advantages of controlled-release fertilizers include: 1. The nutrient release rate of fertilizers is basically consistent with the law of crop fertilizer requirements: reducing the number of fertilization times and saving labor costs. The application before sowing can meet the needs of crops throughout the growth period, and reduce the cost of topdressing fertilizers for farmers. human, material and financial ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05G5/30C05C3/00C05C9/00
Inventor 李继光金志民杨爽张晓军国会艳李贵春孙慧马倩王其传
Owner MUDANJIANG NORMAL UNIV