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Process for preparing granular oxamide

A manufacturing method and technology for oxamide, which are applied to nitrogen fertilizers, fertilizer mixtures, solid/semi-solid fertilizers, etc., can solve the problem of oxamide not using an inclined EIRICH mixer, etc., so as to reduce the workload of fertilization and the number of top dressings. , the effect of high fertilizer hardness

Pending Publication Date: 2018-10-09
MC FERTICOM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the inclined type EIRICH mixer was not used in the granulation of oxamide

Method used

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  • Process for preparing granular oxamide
  • Process for preparing granular oxamide
  • Process for preparing granular oxamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (Embodiment 1) Utilize inclined type Eirich mixer manufacture to add the granular oxamide of 1% modified PVA

[0057] A 5L beaker with 2.7 parts by weight of water was placed in a hot water bath at normal temperature, a stirring motor was set, and while stirring the water, 0.3 parts by weight of modified polyvinyl alcohol (manufactured by Kuraray Co., Ltd., 1300 degrees of polymerization) were slowly added. , Saponification degree 92~98). It heated while stirring, and after reaching 95 degreeC, it stirred for 2 hours, maintaining temperature. After confirming that the modified PVA was completely dissolved, the stirring force was lowered and cooled slowly to prepare a 10% solution.

[0058] After the oxamide powder of 20 parts by weight is dropped into the mixing disc container of inclined type Eirich mixer (manufactured by Japan Eirich Co., Ltd., strong mixer R02 type, the same below), add 2 parts by weight of prepared modified PVA 10% solution was mixed for 1 minute ...

Embodiment 2

[0059] (Embodiment 2) Utilize inclined type Eirich mixer manufacture to add the granular oxamide of 2%PVA

[0060] A 10 L beaker containing 5.4 parts by weight of water was placed in a hot water bath at normal temperature, a stirring motor was installed, and 0.6 parts by weight of PVA was slowly added while stirring the water. It heated while stirring, and after reaching 95 degreeC, it stirred for 2 hours, maintaining temperature. After confirming that the PVA was completely dissolved, the stirring power was reduced and cooled slowly to prepare a 10% solution.

[0061] After putting 20 parts by weight of oxamide powder into the mixing disk container of an inclined EIRICH mixer, add 4 parts by weight of the prepared PVA 10% solution, and mix for 1 minute at a rotor peripheral speed of 6 m / s (900 rpm). Further add 1.66 parts by weight of water, carry out dispersion and granulation for 21 minutes with a rotor peripheral speed of 19m / s (3000rpm), reduce the rotor peripheral speed...

Embodiment 3

[0062] (Embodiment 3) Utilize inclined type Eirich mixer manufacture to add the granular oxamide of 1%PVA

[0063] After the oxamide powder of 20 parts by weight is dropped into the mixing disc container of inclined type Eirich mixer, add the PVA10% solution prepared in 2 parts by weight of embodiment 2, mix 1 with rotor peripheral speed 6m / s (900rpm) minute. Further add 3.63 parts by weight of water, carry out dispersion and granulation for 22 minutes with a rotor peripheral speed of 19m / s (3000rpm), reduce the rotor peripheral speed to 6m / s (900rpm) and discharge after the same treatment for 2 minutes. The discharged granular product was dried with a drier at 105° C. for 4 hours, and then sieved to a particle size range of 2 to 4 mm to obtain granular oxamide containing 1% PVA.

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Abstract

The invention provides granular oxamide which is high in fertilizer particle hardness, and high in shape stability in water and has stable slow-release property. The number of topdressing times and the workload of topdressing can be reduced. A mixture of 0.5 parts by weight or more of polyvinyl alcohol or modified polyvinyl alcohol relative to 100 parts of oxamide powder is subjected to high-speedstirring and granulation in an inclined mixing disc container, and then is dried to prepare the granular oxamide.

Description

technical field [0001] The present invention relates to a method for producing granular oxamide, and in more detail, relates to a method for producing granular oxamide with high fertilizer hardness, high disintegration resistance in water and soil, and stable slow-release fertilizer effect. Background technique [0002] One of the characteristics of the changes in the agricultural structure from 2010 to 2015 is that the reduction rate of the number of agricultural management entities and the number of sales farmers was the highest in the past, and the aging of agricultural practitioners continued. Therefore, in farmland, fertilizers with slow-release nitrogen that can be completed by minimizing the physical workload of fertilization operations and reducing the number of top dressings are widely used. Oxamide (Oxamide) [(CONH 2 ) 2 ] is one of its representative examples. It is an odorless white powder, has low solubility in water, and has no harmful effects on crops. It is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C11/00C05G3/00
CPCC05C11/00C05G3/00C05G5/12
Inventor 冈田辰夫太田靖司小林孝志
Owner MC FERTICOM
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