Process for preparing dazomet dustless stable fine granule

A preparation process and technology of microparticles, applied in biocides, animal repellents, plant growth regulators, etc., can solve the problems of stable dust drift and pollute the environment, and achieve the effects of saving equipment, high content, and low process cost

Inactive Publication Date: 2004-11-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies and defects in the prior art, the present invention provides a preparation process of damelong dust-free stable microparticles, which solves the problems of the stability of damelong preparations and the pollution of the environment by dust drift, reduces costs, and produces high-content , Stable and uniform microgranule products

Method used

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  • Process for preparing dazomet dustless stable fine granule

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0019] (1) Add 40g of 30% methylamine aqueous solution (0.4mol) and 50ml of water into a 250ml three-necked flask with stirring, start stirring, and slowly add 24.4g (0.32mol) of 99% carbon disulfide dropwise. Cool in a cold water bath to keep the reaction temperature not exceeding 30°C. After 1.5 hours of reaction, stand to separate the oil phase (9.2 g of the oil phase can be used for the next reaction), and obtain 106 g of 25.8% intermediate N-methyl disulfide Substitute carbamic acid, its yield is 99.39%.

[0020] (2) Add 106g25.9% intermediate N-methyldithiocarbamic acid, 1g nonylphenol polyoxyethylene ether (n=20), 5% polyvinyl alcohol aqueous solution ( 1799) 40ml, start stirring, start to add 33g of 37% formaldehyde aqueous solution (0.4mol) dropwise, about 20 minutes to finish dropping, while adding formaldehyde dropwise, the three-neck flask is cooled with a cold water bath, keep the reaction temperature not exceeding 30°C, and let stand after 1 hour of reaction Fil...

experiment example 2

[0022] (1) Add 40g of 30% methylamine aqueous solution (0.4mol) and 50ml of water into a 250ml there-necked flask with stirring, start stirring, and slowly add 24.4g (0.32mol) of 99% carbon disulfide (wherein 9.2g is obtained from Experimental Example 1) The separated oil layer), while adding carbon disulfide dropwise, the three-neck flask was cooled with a cold water bath to maintain the reaction temperature not exceeding 30°C, and after 100 minutes of reaction, the oil phase was separated and separated (9.2g of the oil phase can be used for the next reaction) , to obtain 106g25.9% intermediate N-methyldithiocarbamic acid, and its yield was 99.47%.

[0023] (2) Add 106g of 25.9% intermediate N-methyldithiocarbamic acid, 0.2g of nonylphenol polyoxyethylene ether (n=20), and 5% aqueous solution of polyvinylpyrrolidone into a 250ml there-necked flask with stirring (K30) 40ml, start stirring, start dropwise adding 33g of 37% formaldehyde aqueous solution (0.4mol), and drop it in ...

experiment example 3

[0025] (1) Add 40g of 30% methylamine aqueous solution (0.4mol) and 50ml of water into a 250ml there-necked flask with stirring, start stirring, and slowly add 15.2g (0.2mol) of carbon disulfide (9.2g of which is separated from Experimental Example 2) oil layer), and while adding carbon disulfide dropwise, the three-neck flask was cooled with a cold water bath, and the reaction temperature was maintained at no more than 30°C. After 1.5 hours of reaction, the layers were allowed to stand and the oil phase was separated (the oil phase can be used mechanically for the next reaction) to obtain 106g 25.5% intermediate N-methyldithiocarbamate, the yield is 98.24%.

[0026] (2) Add 106g of 25.6% intermediate N-methyldithiocarbamate, 2g of sodium lauryl sulfate, and 40ml of 1% polyvinyl alcohol aqueous solution (1799) into a 250ml there-necked flask with stirring, and start stirring , start to add 39g of 37% formaldehyde solution (0.48mol) dropwise, and finish dropping in about 20 min...

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Abstract

A process for preparing dazomet dust free stabilized fine granules from methylamine and carbon sulfide as raw material through the steps of, diluting methylamine with water in reactor, agitating, dropping carbon sulfide and controlling reaction temperature, continuing stirring 1-2h, stewing to obtain oil layer, thus the intermediate compound N-methyl dithiocarbamic acid is prepared, adding into reactor in turn the intermediate compound N-methyl dithiocarbamic acid prepared in the previous step and the water solution of soluble macromolecular compound, surface active agent, stirring, dropping formaldehyde solution and controlling reaction temperature, stewing for filtering, thus dazomet fine granule with 100 mesh average grain diameter can be prepared by drying the filter cake.

Description

technical field [0001] The invention relates to a process for preparing a dust-free stable granule, in particular to a process for preparing a dust-free stable granule, belonging to the field of agricultural chemicals. technical background [0002] Metron has been produced for many years. Because methyl bromide is destructive to atmospheric ozone, the International Food and Agriculture Organization stipulates that the use of methyl bromide should be banned after 2005. At the same time, dapron is recommended by FAO as an alternative to methyl bromide for global promotion and application. The content of the original drug of Diamron is usually about 95%, and the reaction yield is less than 90%. The dosage forms of Diamron are usually powder and wettable powder. These preparations are prone to decomposition during storage, releasing hydrogen sulfide gas and damaging the packaging. worsen the environment. The method of using daniron is the method of spreading poisonous soil. Whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N43/88
Inventor 曹永松陆贻通
Owner SHANGHAI JIAO TONG UNIV
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