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Method for preparing sustained-release insecticide microcapsule by using supercritical fluid technology

A slow-release insecticide and supercritical fluid technology, applied in the direction of insecticide, microcapsule preparation, botanical equipment and methods, etc., can solve the problems of inconvenient use, user inconvenience, toxicity, etc., to reduce the tendency of agglomeration, uniform Effect of coating and improving uniformity

Active Publication Date: 2012-06-20
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing various mosquito and fly killing liquids on the market are sprayed indoors during use. The medicine volatilizes quickly and can effectively kill the pests. However, due to the rapid release of the medicine, the maintenance time of the medicine effect is very short, and it needs to be sprayed from time to time. User inconvenience
Disclosed in Chinese patent application 95111196 is a kind of long-acting hygienic insecticide dip-coating concentrate, but this product has poisonous, peculiar smell, effective time is still not long, and it is inconvenient to use

Method used

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  • Method for preparing sustained-release insecticide microcapsule by using supercritical fluid technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation of product A: 1) hydroxymethyl cellulose, attapulgite, jasmine essence, undecylenyl amidopropyl betaine are added to 500 parts by weight of 85 parts: 100 parts: 0.5 parts: 0.1 parts In an acetone solution of 0.1% (wt) pyrethroid amine, mix and stir at 40°C to 50°C to obtain a mixed solution;

[0016] 2) placing the mixed solution in an autoclave, adding carbon dioxide boosted by a high-pressure diaphragm pump into the autoclave, heating up to form a supercritical state and stirring to form a suspension;

[0017] 3) The suspension is sprayed and impacted by a pair of nozzles placed coaxially opposite each other, the separated coated microcapsule particles and carbon dioxide are separated by a gas-solid separator, and the separated microcapsule particles are collected to obtain the insecticide slow-release microcapsule product a.

Embodiment 2

[0019] Preparation of product B: use hydroxyethyl cellulose instead of hydroxymethyl cellulose, use undecylenyl amidopropyl betaine instead of undecylenamidopropyl betaine, repeat the preparation method of Example 1, and obtain the product b.

Embodiment 3

[0021] Product performance test: Add water to products A and B and mix them evenly to prepare 0.1% (wt) atomized solution for later use. Put 30 live houseflies and 20 live Anopheles mosquitoes into each airtight test chamber respectively to spray Methods Spray the atomized liquid of products A and B on the tank wall respectively, with a spray volume of 5ml. Start timing and regularly observe and record the number of knocked down after 24 hours, remove the mosquitoes and flies in the box, put the same number of mosquitoes and flies into the test box after 72 hours, start timing and regularly observe and record the knocked down after 24 hours only count. At the same time, a blank control test was carried out. See below for results.

[0022]

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Abstract

The invention discloses a method for preparing a sustained-release insecticide microcapsule by using a supercritical fluid technology. A composition prepared with the method comprises ingredients, such as cellulose, attapulgite, essence, a betaine ampholytic surface active agent and the like. The method comprises the following steps of: compounding the above ingredients; and further evenly covering particles with a supercritical impact micro-granule wrapping method. With the method, the agglomeration tendency which easily appears when the common means are adopted is lightened so as to improvethe evenness of the microcapsule. Meanwhile, the method also has the universal advantages of the traditional supercritical wrapping method. The composition prepared with the method has a good insecticidal effect and an obvious sustained-release effect.

Description

technical field [0001] The invention relates to a method for preparing a household slow-release insecticide composition, in particular to a method for preparing slow-release insecticide microcapsules by supercritical fluid technology. The composition prepared by the method is suitable for insecticide indoors and closed environments by spraying, can slowly release insecticidal active ingredients, and maintains long-term killing effect on common household pathogenic insects such as mosquitoes, flies, and dust mites. Background technique [0002] Pyrethroid compounds are useful in controlling mosquitoes and are well known for their high insecticidal activity. However, the existing various mosquito and fly killing liquids on the market are sprayed indoors during use. The medicine volatilizes quickly and can effectively kill the pests. However, due to the rapid release of the medicine, the maintenance time of the medicine effect is very short, and it needs to be sprayed from time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/28A01N53/00A01P7/04A01P7/02B01J13/02
Inventor 吴浩
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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