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Polymer chemical slow release fungicide contg. carbendazim active component

A high-molecular type, fungicide technology, applied in biocides, animal repellents, plant growth regulators, etc., can solve uneconomical problems, achieve the effects of less application times, stable chemicals, and lower agricultural costs

Inactive Publication Date: 2003-05-28
中国中化股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, from the point of view of saving labor, the method of repeated application is very uneconomical

Method used

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  • Polymer chemical slow release fungicide contg. carbendazim active component

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1 Synthesis of 1-hydroxyethyl-2-benzimidazole carbamate

[0024] In a 125 ml four-neck flask equipped with a stirrer, a thermometer, and a reflux condenser, add 2.0 g (0.0104 mol) of carbendazim, 1.33 g (0.0156 mol) of chloroethanol, 75 ml of absolute ethanol and an appropriate amount of Sodium ethoxide, start stirring, heat up, reflux for 1 hour and then cool to room temperature, filter, rinse the filter cake with 100 ml of 50°C distilled water, and drain to obtain 1.76 g of a light yellow solid with a yield of 72%. The crude product is purified by a silica gel column Afterwards (chloroform was the eluent) an off-white solid was obtained with a purity of 99.6%, mp.227°C (discoloration and decomposition). 1 H NMR (DMSO) δ3.86 (s, 3H, CH 3 ), 4.11(t, 2H, CH 2 ), 4.40(t, 2H, CH 2 ), 6.87-7.34 (m, 4H, aromatic), 11.71 (s, 1H, -NHCOO-); IR carbamate carbonyl characteristic absorption peak 1740cm -1 , benzene ring skeleton vibration absorption peak 1580cm -1 、15...

example 2

[0025] Example 2 Synthesis of methyl 1-ethyl (2'-acrylate-1'-yl)-2-benzimidazole carbamate

[0026] In a 125 ml four-neck flask equipped with a stirrer, a thermometer, and a reflux condenser, add 1.5 grams (0.0055 moles) of crude product 1-hydroxyethyl-2-benzimidazole carbamate, 0.56 grams (0.0056 moles) Triethylamine, dichloromethane 65 ml, start stirring, cool down to 0-5°C with an ice-water bath, add 0.5 g (0.0055 mole) of acryloyl chloride dropwise, slowly warm up to room temperature and continue stirring for 5 hours, then depressurize The solvent was distilled off to obtain a light pink solid, which was recrystallized with isopropanol to obtain 0.76 g of a light yellow solid with a purity of 98%, mp. 201°C (decomposition), and a yield of 48%. 1 H NMR (CDCl 3)δ3.62(s, 3H, CH 3 ), 4.56(t, 2H, CH 2 ), 4.50(t, 2H, CH 2 ), 6.2-64 (m, 3H, -CH=CH 2 ), 6.98-7.23 (m, 4H, aromatic), 10.08 (s, 1H, -NHCOO-).

example 3

[0027] Synthesis of Example 3 Polymer Sustained Release Agent (I)

[0028] In a 250 ml three-neck flask equipped with a thermometer, stirring and reflux condenser, add 100 ml of benzene, 2.89 g of 1-ethyl(2'-acrylate-1'-yl)-2-benzimidazole carbamate 1. 0.01 g of benzoyl peroxide, slowly warming up to 60° C. under stirring, and reacting for 1 hour. Then cool down, add 80 milliliters of water, then concentrate under vacuum with stirring, reclaim benzene, filter the residue, and dry to obtain 2.3 grams of light red solid, which is polymer slow-release agent (I), with a yield of 80%. The average molecular weight is 6,500 as measured by Ubbelohde's viscometer, that is, the degree of polymerization n is 22.

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Abstract

A high-molecular slow-release chemical disinfectant containing carbendazim as active component is prepared by linking the carbendazim to the high-molecular carrier, and its features are that the disinfectant itself does not show disinfecting activity, but can release enough carbendazim under its application environment where its chemical bond is broken off.

Description

technical field [0001] The invention belongs to the field of agricultural chemicals. [0002] The invention relates to a polymer type chemical slow-release bactericide, a preparation method and application thereof. Background technique [0003] There have been reports on the development of high-molecular-type chemical slow-release pesticides abroad. For example, high-molecular-type controlled-release pesticides and their synthesis methods are discussed in US4267280 and US4267281, but the pesticide molecules used are 4-amino-6-tert-butyl-3 -(methylthio)-aS-triazin-5(4H)one, the bridging agent used is multi-substituted isocyanate, and the polymer used is polyvinyl alcohol. In US4225693, polymer controlled-release pesticides and their synthesis methods are discussed, and it is mentioned that pesticides 2,4-D (2,4-dichlorophenoxyacetic acid) are made into polymerizable monomers, and then polymerized into polymers Type controlled release pesticides, can be used for insecticide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/10
Inventor 刘冬雪台立民魏峰吴玉春王新旋咏梅张晓燕王炳帅刘博李建华谭波
Owner 中国中化股份有限公司
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