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Preparation method of phosphoric acid-carbamic acid starch ester coated urea slow-release fertilizer

A carbamate and urea coating technology, which is applied in ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, urea compound fertilizer, etc., can solve the problems of environmental pollution by coating material, high price of coating urea, complicated process, etc. Achieve the effect of avoiding secondary pollution, reducing the number of fertilization and simple process

Active Publication Date: 2020-01-24
QIQIHAR UNIVERSITY
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low utilization rate of existing urea and high price of urea coated with other coating materials, complex process, high cost, and environmental pollution of coating materials, and provide a kind of phosphoric acid-carbamic acid starch ester coating Preparation method of urea-coated slow-release fertilizer

Method used

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  • Preparation method of phosphoric acid-carbamic acid starch ester coated urea slow-release fertilizer
  • Preparation method of phosphoric acid-carbamic acid starch ester coated urea slow-release fertilizer
  • Preparation method of phosphoric acid-carbamic acid starch ester coated urea slow-release fertilizer

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specific Embodiment approach 1

[0042] Specific embodiment one: present embodiment is a kind of preparation method of phosphoric acid-carbamic acid starch ester coating urea slow-release type fertilizer, is to finish according to the following steps:

[0043] One, prepare phosphoric acid-carbamic acid starch ester:

[0044] ①. Mix starch, phosphate and urea evenly, and then grind to obtain mixed powder; transfer the mixed powder to the reaction kettle, then add absolute ethanol and deionized water to the reaction kettle, and then seal the reaction kettle for esterification. reaction to obtain phosphoric acid-carbamic acid starch ester crude product;

[0045] The mass ratio of starch and phosphate described in step 1. is (10.0~50.00):(9.0~45.0);

[0046] The mass ratio of starch and urea described in step 1. is (10.0~50.0):(7.0~35.0);

[0047] The mass of the starch described in step 1. and the volume ratio of dehydrated alcohol are (10g~50g):(10mL~50mL);

[0048] The volume ratio of the mass of starch des...

specific Embodiment approach 2

[0069] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the starch described in step 1. is corn starch, wheat starch or potato starch. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0070] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the grinding time in step ① is 30 minutes to 60 minutes. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a phosphoric acid-carbamic acid starch ester coated urea slow-release fertilizer, and relates to a preparation method of a slow-release fertilizer. Thefertilizer is invented to solve the problems of conventional low utilization rate of urea, high cost in coating of urea with other coating materials, complex process, high cost and environmental pollution caused by the coating materials. The method comprises the following steps: 1, preparing phosphoric acid-carbamic acid starch ester; 2, preparing a cellulose dispersion liquid; 3, preparing a cellulose binder solution; and 4, coating to obtain the phosphoric acid-carbamic acid starch ester coated urea slow-release fertilizer. The method is simple in process, high in operability and low in energy consumption, can reduce environmental pollution, does not need production conditions of expensive instruments, and is suitable for industrial production and large-scale farmland crop application. According to the preparation method, the phosphoric acid-carbamic acid starch ester coated urea slow-release fertilizer can be obtained.

Description

technical field [0001] The invention relates to a preparation method of slow-release fertilizer. Background technique [0002] As a large agricultural country in my country, urea in particular plays a very important role in agricultural production. China is both a big producer and a big user of urea, but the utilization rate of urea after it is applied to the soil is not high, mainly due to the volatilization and loss of nitrogen. At the same time, too much fertilizer intake will not only cause the loss of manpower and material resources, but also cause serious environmental damage. The main manifestation is that the nutrients in the fertilizer that cannot be absorbed and utilized destroy the quality of the soil. The lost fertilizer nutrients are collected in the surface layer and the groundwater layer, resulting in excessive nitrate and nitrite content in the water body, which is harmful to human health. At the same time, part of the nitrogen element is chemically formed i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G3/40C05G3/90C05G3/00
CPCC05C9/005C05B7/00C05G3/00
Inventor 张文治牟忠华董国华吴昊白丽明隋丽丽郎坤郝丽娟魏铭辉
Owner QIQIHAR UNIVERSITY
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