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Process for preparing pesticide microcapsules by interfacial polymerization method

An interfacial polymerization method and microcapsule technology, applied in the fields of botanical equipment and methods, animal repellents, biocides, etc., can solve the problems of being unsuitable for large-scale industrial production, strict production process requirements, and high production costs. The effect of convenient industrial production, low equipment requirements and low price

Inactive Publication Date: 2010-06-16
HEBEI AGRICULTURAL UNIV.
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the existing process for preparing pesticide microcapsules by interfacial polymerization are: high production cost, complex process, strict production process requirements, high equipment requirements, and not suitable for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Prepare 10% chlorfenapyr microcapsule suspension. Dissolve 10% chlorfenapyr in 16% toluene, add 8.4% emulsifier and 12% toluene-2.4-diisocyanate, stir well to form an organic phase, pour the organic phase into 4.2% urea and 1.0% disperse In the aqueous solution of polyvinyl alcohol 1988, in a high-speed shearing machine, shear at 20,000 rpm for 5 minutes, pour the shear liquid into the reaction kettle, stir and react for 10 hours under the condition of heating in a constant temperature water bath at 35°C, and then add 0.2% xanthan gum, 3.0% ethylene glycol, as a thickener and antifreeze, continue stirring for 2 hours to obtain 10% chlorfenapyr microcapsule suspension. The capsule suspension properties are as follows:

[0017] Appearance: Milky white aqueous suspension; Capsule shape: spherical; Average particle diameter: 2.14um; Decomposition rate (%): 1.44% when stored at 54±2°C for 14 days; Suspension rate: >90.0%.

Embodiment 2

[0019] Prepare 30% phoxim microcapsule suspension. Add 9.5% emulsifier and 10% toluene-2.4-diisocyanate to 30% phoxim crude oil, stir evenly to form an organic phase, pour the organic phase into an aqueous solution of 4.1% urea and 1.0% dispersant polyvinyl alcohol 1988 In a high-speed shearing machine, shear at 20,000 rpm for 5 minutes, pour the shear liquid into the reaction kettle, and stir and react for 10 hours under the condition of heating in a constant temperature water bath at 35°C. Then add 0.3% xanthan gum and 7.0% ethylene glycol, and continue stirring for 2 hours to obtain 30% phoxim microcapsule suspension. The 30% phoxim microcapsule suspension has the following properties:

[0020] Appearance: Yellow aqueous suspension; Capsule shape: Spherical; Average particle diameter: 2.8um; Decomposition rate (%): 1.35% when stored at 54±2°C for 14 days; Suspension rate: >90.0%.

Embodiment 3

[0022] Prepare 5.0% beta-cypermethrin microcapsule suspension. Dissolve 5.0% beta-cypermethrin in 9.56% xylene, add 4.5% emulsifier and 4% toluene-2.4-diisocyanate, stir evenly to form an organic phase, pour the organic phase into 3.9% urea and 1.0% disperse In the aqueous solution of polyvinyl alcohol 1988, in a high-speed shearing machine, shear at 20,000 rpm for 5 minutes, pour the shearing liquid into the reaction kettle, and stir and react for 10 hours under the condition of heating in a constant temperature water bath at 35°C. Then add 0.25% xanthan gum and 4.0% ethylene glycol, and continue stirring for 2 hours to obtain 5.0% beta-cypermethrin microcapsule suspension. The properties of the 5.0% beta-cypermethrin microcapsule suspension are as follows:

[0023] Appearance: Milky white aqueous suspension; Capsule shape: spherical; Average particle diameter: 3.0um; Decomposition rate (%): 2.81% when stored at 54±2°C for 14 days. Suspension rate: >90.0%.

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Abstract

The invention discloses a process for preparing pesticide microcapsules by an interfacial polymerization method. On the basis of the conventional process, urea replaces polyamine and polyalcohol in water soluble monomers. The pesticide microcapsules prepared by the process have high cladding ratio of over 98 percent and the particle size of between 3 and 5mu m, has the characteristic of a water-based preparation, and has better sustained-release effect; the urea replaces polyamine and polyalcohol and is directly dissolved in water to form aqueous solution; and then isocyanate and pesticide active ingredients form an oil phase which is dispersed in the aqueous solution for interfacial polymerization. Compared with the traditional interfacial polymerization method, the urea material is easily obtained, the price is low, and the production cost can be obviously reduced; and the urea is directly dissolved in water to form the aqueous solution, the dropwise addition link is reduced, the requirement on equipment is lower, the operation is more simple, the process is suitable for industrial production, and the pesticide microcapsules have strong market competition strength.

Description

technical field [0001] The invention relates to a new process for preparing pesticide microcapsules by using an improved method of interfacial polymerization. Background technique [0002] Pesticide microcapsules are a water-based preparation that can not only meet the requirements of strong safety, environmental protection and low price, but also prolong the duration of drug effect. Microcapsules refer to microcapsules that use natural or synthetic polymer capsule wall materials to coat solid, liquid or even gaseous microcapsule core substances to form semipermeable or closed capsules with a diameter of 1-800um. The required capsule wall material can form an adhesive film on the capsule core substance without chemical reaction with the capsule core substance. At the same time, the permeability, stability, hygroscopicity and other factors of the product should also be considered. Interfacial polymerization is the most commonly used method to prepare pesticide microcapsules....

Claims

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Application Information

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IPC IPC(8): A01N25/28
Inventor 赤国彤樊玉松庞民好
Owner HEBEI AGRICULTURAL UNIV.
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