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A double-coated long-acting slow-release fertilizer and preparation method thereof

A slow-controlled-release fertilizer, double-coated technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve problems such as waste, reduce fertilizer utilization, and achieve the effect of high fertilizer utilization.

Active Publication Date: 2017-02-01
NANJING SHINEKING BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many types of coated slow-release fertilizers on the market, nutrients are still released too quickly in the early and middle stages of the slow-release process, which reduces the utilization rate of fertilizers and causes a lot of waste

Method used

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  • A double-coated long-acting slow-release fertilizer and preparation method thereof
  • A double-coated long-acting slow-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] raw material:

[0039] Nitrogen-containing 46.3wt% large particle urea 850g, auxiliary materials fulvic acid 75g, auxiliary materials sodium lignosulfonate 75g, polyethylene resin 15g, industrial acetone 1000ml, polyglutamic acid 1g, water 150ml.

[0040] Preparation:

[0041] (1) Put polyethylene resin and industrial acetone into a mixer to fully dissolve the materials to obtain 1000ml of polyethylene resin coating solution; dissolve 1g of polyglutamic acid in 150ml of water to form a polyglutamic acid solution; Granular urea and 150g of auxiliary materials are uniformly mixed in a blender to obtain 1000g of fertilizer core.

[0042] (2) Put 1000g of fertilizer core into the fluidized bed, make it in a fluidized state, pass in hot air at 50-80°C, and in the rotating drum fluidized bed, the prepared polyglutamic acid solution is evenly sprayed onto fertilizer granules. The solution is quickly evaporated to dryness in hot air, and a uniform polyglutamic acid coating i...

Embodiment 2

[0046] raw material:

[0047] Contains N-P 2 o 5 -K 2 O: 850g of large particle compound fertilizer with a weight ratio of 15-15-15, 75g of auxiliary materials dolomite, 75g of auxiliary materials calcium carbonate powder, 15g of epoxy resin, 500ml of industrial paraffin oil, 500ml of bisphenol A, 0.7g of polyglutamic acid, and 150ml of water .

[0048] Preparation:

[0049] (1) Put epoxy resin, industrial paraffin oil and bisphenol A into a mixer to fully dissolve the materials to obtain 1000ml of polyethylene resin coating solution; dissolve 0.7g of polyglutamic acid in 150ml of water to form polyglutamic acid Acid solution: Mix 850g of large-grain urea and 150g of auxiliary materials in a blender to obtain 1000g of fertilizer core.

[0050] (2) Put 1000g of fertilizer core into the fluidized bed, make it in a fluidized state, pass in hot air at 50-80°C, and in the rotating drum fluidized bed, the prepared polyglutamic acid solution is evenly sprayed onto fertilizer gr...

Embodiment 3

[0054] raw material:

[0055] Contains N-P 2 o 5 -K 2 O: 850g of large-grain compound fertilizer with a weight ratio of 30-10-10, 150g of auxiliary materials attapulgite powder, 15g of polyurethane, 800ml of industrial paraffin oil, 200ml of xylene, 1g of polyglutamic acid, and 150ml of water.

[0056] Preparation:

[0057] (1) Polyurethane, industrial paraffin oil and xylene are put into mixer, and material is fully dissolved, and 1000ml of polyethylene resin coating solution is obtained; 1g polyglutamic acid is dissolved in 150ml water, forms polyglutamic acid solution; 850g of large particle urea and 150g of auxiliary materials are mixed uniformly in a blender to obtain 1000g of fertilizer core.

[0058] (2) Put 1000g of fertilizer core into the fluidized bed, make it in a fluidized state, pass in hot air at 50-80°C, and in the rotating drum fluidized bed, the prepared polyglutamic acid solution is evenly sprayed onto fertilizer granules. The solution is quickly evapo...

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Abstract

The invention discloses a double-coated long-acting controlled-release fertilizer and a preparation method thereof. The preparation method comprises the following steps: sequentially spraying a coating liquid containing polyglutamic acid and a resin coating liquid on the fertilizer core surface made of common fertilizer, and respectively forming a coated film. Compared with the prior art, the double-coated long-acting controlled-release fertilizer can keep stable release rate in the whole nutrient slow-release process, and has higher utilization ratio than the existing coated controlled-release fertilizer.

Description

technical field [0001] The invention belongs to the field of fertilizer production, and in particular relates to a double-coated long-acting slow-controlled release fertilizer and a preparation method thereof. Background technique [0002] my country is a big agricultural country, and it is also a big country that consumes chemical fertilizers. The total consumption of chemical fertilizers ranks first in the world. However, the seasonal utilization rate of chemical fertilizers used in my country is relatively low. The loss of a large amount of fertilizer not only causes huge economic losses, but also causes serious environmental pollution. Therefore, in order to meet the requirements of the development of modern agriculture and overcome the bottleneck of resource and environment constraints, it is an urgent task for agriculture to reduce the input of chemical fertilizers, improve the utilization rate of fertilizers and protect the environment under the premise of ensuring g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 徐虹冯小海许宗奇梁金丰李莎
Owner NANJING SHINEKING BIOTECH CO LTD