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Preparation method for slow-release type imidacloprid granules

A technology for imidacloprid and granules, which is applied in the field of preparation of slow-release imidacloprid granules, can solve the problems of low utilization rate of pesticides, loss, surface or groundwater pollution, etc., and achieves the effects of simple processing, reduced pollution and light specific gravity.

Inactive Publication Date: 2014-11-05
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned problems, the present invention provides a preparation method of sustained-release imidacloprid granules, to overcome the low utilization rate of pesticides caused by the rapid release of imidacloprid active ingredients in the prior art, and the loss or leaching of active ingredients leading to surface pollution. Or the problem of groundwater pollution, so as to improve the efficacy, prolong the duration, and reduce the migration of pesticides in the environment, control pesticide pollution from the source, thereby reducing the frequency of imidacloprid application and improving the safety of application

Method used

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  • Preparation method for slow-release type imidacloprid granules
  • Preparation method for slow-release type imidacloprid granules

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Embodiment 1

[0024] figure 1 It is a schematic flow chart of the preparation method of the sustained-release imidacloprid granules provided in Example 1 of the present invention; as shown in the figure, the preparation method of the sustained-release imidacloprid granules provided in Example 1 of the present invention includes:

[0025] First, prepare biomass raw materials and imidacloprid raw materials, the biomass raw materials are straw, wood chips, leaves, and other biomass waste in agricultural or forestry production;

[0026] Then, the biomass raw material is subjected to oxygen-limited pyrolysis (ie, isolating oxygen for pyrolysis) at a temperature of 200°C to 500°C, to obtain a biomass adsorbent, which has a pore structure and hydrophobicity. Carbon compounds with high adsorption capacity for imidacloprid;

[0027] Then mix the biomass adsorption material and imidacloprid technical uniformly according to the mass ratio of 2-10:1, such as 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8 : 1, 9:1, 10:1, et...

Embodiment 2

[0030] Weigh 300g of dried leaves, put them in several crucibles in batches, put the crucible lids on them, put them into the muffle furnace, heat up to 300°C, keep them warm for 3h, cool down and wait for the crucible to cool to room temperature, then take out the residual carbon in the crucible , Washed with water and adjusted to pH=6.5, dried and pulverized the solid after suction filtration to obtain 72 g of biomass adsorption material.

[0031] Grind and mix the above-mentioned biomass adsorbent and 15 g of imidacloprid original drug (purity 95%), grind and sieve (aperture 0.15 mm) to obtain drug-loaded powder. Then, add the drug-loaded powder to the fluidized bed spray granulator, use 0.5% (mass concentration) sodium alginate aqueous solution as the binder, adjust the fluidizing gas velocity to 1.5m / s, and the fluidized bed temperature to 60 , The atomizing air pressure is 0.3MPa, and the binder liquid is atomized and sprayed evenly on the fluidized drug-carrying powder. Af...

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Abstract

A disclosed preparation method for slow-release type imidacloprid granules comprises: performing oxygen-limited pyrolysis on a biomass raw material at low-medium temperature, so as to obtain a biomass adsorption material, then grinding with imidacloprid crude drug, mixing uniformly, taking sodium alginate or carboxymethyl cellulose as a binder, and utilizing a fluidized bed spray granulation technology to prepare the imidacloprid granules. Because the biomass adsorption material obtained through pyrolysis of agricultural or forestry wastes is capable of adsorbing a part of imidacloprid active composition, the release rate of the active composition can be regulated by utilizing adsorption effect. Compared with the prior art, an adsorption carrier is low in cost and easy to obtain. Also, the biomass adsorption material is relatively light in specific gravity when being used as a pesticide carrier, is convenient for fluidized bed spray granulation, and is capable of integrally realizing granulating and drying of the imidacloprid granules. Compared with the prior art, the prepared is simple and convenient to process and good in safety. The granules have slow-release effect, are beneficial for improving the utilization rate of imidacloprid and mitigating pollution of pesticides to environment.

Description

Technical field [0001] The present invention relates to the field of pesticide preparations, in particular to a preparation method of slow-release imidacloprid granules. Background technique [0002] Imidacloprid is a nitromethylene insecticide with multiple effects such as contact killing, stomach poisoning and systemic inhalation. It is mainly used to control piercing-sucking mouthparts pests and their resistant strains. Imidacloprid is a super-efficient nicotine insecticide with broad spectrum, high efficiency, low toxicity and low residue. It is not easy to produce resistance to pests, and it is safe to humans, animals, plants and natural enemies. It can be used in rice, wheat, corn, Cotton, potatoes, vegetables, sugar beets, fruit trees and other crops. Due to its excellent systemic properties, it is especially suitable for seed treatment and spraying granules. At present, the common imidacloprid preparations on the market mainly include emulsifiable concentrates, suspensi...

Claims

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Application Information

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IPC IPC(8): A01N51/00A01N25/12A01N25/08A01P7/04
Inventor 李建法吕金红李益民徐海霞刘森
Owner SHAOXING UNIVERSITY
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