KR20000028283A - Microcapsule insecticide using biodegradable polymeric material - Google Patents

Abstract

PURPOSE: A micro capsule insecticide capsuled an insecticidal composition with a biodegradable polymer is provided which is effective in reducing effort and cost by spraying of chemicals because of the gradually releasing property of chemical component. CONSTITUTION: A biodegradable micro capsule insecticide comprises as an active component organic phosphorus insecticides or pyrethroid insecticides, organic solvents, poly lactic acid as a capsuling agent and one or more of supplement agents selected from the groups consisting of surface active agents, dispersing agents, viscosity controllers, and water. Also described is a dispersion liquid phase type micro capsule insecticide or powdery type micro capsule insecticide.

Description

Microcapsule Insecticide Using Biodegradable Polymer

The present invention relates to a microcapsule type insecticide using a biodegradable polymer.

The problem of environmental pollution is the problem of the whole planet and human survival that can no longer be neglected. One of the causes of many environmental pollutions is the use of excess pesticides and pesticides. Indiscriminate use of pesticides and pesticides results in the killing of not only harmful pests but also harmful or beneficial insects. Thus, the food chains of the birds and animals that feed them are cut off, and the ecosystem is devastating.

The present inventors have endeavored to combat pests harmful to humans without affecting these environmental problems, and thus, the present invention has been completed by developing a method for preparing pesticide components in the form of microcapsules.

The microencapsulated insecticide according to the present invention uses a biodegradable substance that is not environmentally polluted even when exposed to the environment to alleviate strong toxicity by encapsulating the insecticide component with the encapsulating substance and continuously encapsulate the encapsulated insecticide pharmaceutical ingredient as the encapsulating substance is gradually degraded. Since it is released slowly, the number of sprays and the amount of spraying of pesticides can be reduced, thereby reducing the environmental pollution caused by drug spraying and the effort and cost of drug spraying.

The purpose of encapsulating the pesticide material is to extend the drug duration of drugs with short duration of drug efficacy, and to relieve strong toxicity because it is slowly released by encapsulating the toxic pesticide ingredient in a capsule material. In addition, by encapsulating the pesticide, it is possible to minimize the abuse of the pesticide and to act deadly to pests, but it does not have a fatal effect on other birds or animals in the food chain relationship.

Accordingly, it is an object of the present invention to provide a microcapsule-type pesticide prepared by wrapping the pesticide component with a biodegradable material.

It is another object of the present invention to provide a suspension or powder formulation of a pesticide in microcapsule form prepared by wrapping the pesticide component with a biodegradable substance.

The present invention is a synthetic pyrethroid using PLA (Poly Lactic Acid), a biodegradable polymer, as an encapsulating wall material and organophosphorus insecticides such as chlorpyriphos, dichlorbose, fenitrothion, diazinon, etc. Insecticides deltamethrin, ciphermethrin, and permethrin have been microencapsulated.

Briefly describing the preparation method of the microencapsulated insecticide, the organophosphorus insecticide and the synthetic pyrethroid insecticide are dissolved in an organic solvent, and then a surfactant, a dispersant, a viscosity modifier, and water are added. The solution is added to the solution in which polylactic acid is dissolved in a ratio of 1 to 1 to 10 in a weight ratio of acetone while being vigorously stirred to prepare a microencapsulated insecticide.

A brief description will be made of a method for preparing a microencapsulated insecticide powder, in which an organic phosphorus insecticide component and a synthetic pyrethroid insecticide component are dissolved in an organic solvent, and then a surfactant, a dispersant, and water are added. The solution is added to the solution in which polylactic acid is dissolved in a ratio of 1 to 1 to 10 in a weight ratio of acetone with vigorous stirring, and then the solution is filtered and dried to prepare a microencapsulated powder.

Organophosphorus insecticides used in the present invention are chlorpyriphos, diazinon, dichlorbose, fenitrothion and the like, and synthetic pyrethroid insecticides are deltamethrin, cyspermethrin, permethrin and the like. These insecticides were encapsulated in a weight ratio of 1 to 80 percent, and nonionic surfactants were TWEEN 80 (trade name), MONOPOL (trade name), polyoxyalkylene arylether, and sorbitan monoester (Sorbitan). monoester) and Pionnin SB50 (trade name) as the cationic surfactant, sodium dodecyl sulfate, alkyl benzene sulfonate and the like by weight of 3 to 20% as anionic surfactant.

As dispersant, NK-KNZ (Epoxidized fatty oil), NK-DIS (trade name) 20 (alkyl naphthalene sulfonate, lignosulfonate mixture), xanthan gum, etc. were used in a weight ratio of 1 to 10 percent. 5 to 20 percent by weight of propylene glycol was used, and organic solvents used were 0 to 30 percent by weight of Solvesso (trade name), Kocosol (trade name), diacetone alcohol, acetone, methylene chloride, and the like. It was.

The invention is described in detail in the following examples, but the invention is not limited to the following examples.

Example 1

In a reactor equipped with a high speed stirrer and a reflux condenser, 100 g of chlorpyriphos, 100 g of acetone, and 20 g of polylactic acid are added, heated, and refluxed. The solution is slowly stirred and dissolved. When all are dissolved, sodium dodecyl sulfate as a surfactant is used in the solution. Slowly add the aqueous solution in which 10 g of dodecyl sulfate) and 2 g of xanthan gum were dissolved in 698 g of water, increasing the stirring rotation to maintain 3,000 revolutions per minute. Subsequently, 20 g of NK-KNZ (trade name) and 50 g of glycerin were added and rotated at a high speed for 2 hours to obtain 1,000 g of chlorpyriphos 10% suspension encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 2

100 g of diazinon, 100 g of diacetone alcohol, and 20 g of polylactic acid were added to a reactor equipped with a high speed stirring device and a reflux cooler, and the mixture was heated to reflux and slowly stirred to dissolve. When all are dissolved, an aqueous solution of 10 g of polyoxyalkylene aryl ether and 2 g of xanthan gum, dissolved in 698 g of water, is slowly added to the solution to increase stirring and maintain 3,000 revolutions per minute. Subsequently, 20 g of NK-KNZ (trade name) and 50 g of flohylene glycol were added thereto, and the mixture was rotated at high speed for 2 hours to obtain 1,000 g of a diazinon 10% suspension encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 3

100 g of deltamethrin, 100 g of Solvesso (trade name), and 20 g of polylactic acid were added to a reactor equipped with a high speed stirring device and a reflux cooler, followed by heating and reflux cooling. When all are dissolved, the solution is slowly added with an aqueous solution of 10 g of sodium dodecyl sulfate and 2 g of xanthan gum in 698 g of water. The stirring speed is increased to maintain 3,000 revolutions per minute. Subsequently, 20 g of NK-KNZ (trade name) and 50 g of glycerin were added and rotated at a high speed for 2 hours to obtain 1,000 g of a deltamethrin 10% suspension encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 4

Into a reactor equipped with a high speed stirrer and a reflux condenser, 100 ml of permethrin, 100 g of acetone, and 20 g of polylactic acid were added, heated, and refluxed. When all are dissolved, slowly add an aqueous solution in which 10 g of sodium dodecyl sulfate and 2 g of xanthan gum are dissolved in 698 g of water to the solution to increase the stirring rotation to maintain 3,000 revolutions per minute. Subsequently, 20 g of NK-KNZ (trade name) and 50 g of glycerin were added and rotated at high speed for 2 hours to obtain 1,000 g of a permethrin 10% suspension encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 5

Into a reactor equipped with a high speed stirrer and a reflux condenser, 100 g of fenitrothion, 100 g of Kocosol (trade name), and 20 g of polylactic acid are heated and refluxed while stirring to dissolve gradually. When all are dissolved, slowly add an aqueous solution in which 10 g of sodium dodecyl sulfate and 2 g of xanthan gum are dissolved in 698 g of water to the solution to increase the stirring rotation to maintain 3,000 revolutions per minute. Subsequently, 20 g of NK-KNZ (trade name) and 50 g of glycerin were added and rotated at a high speed for 2 hours to obtain 1,000 g of fenitrothion 10% suspension encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 6

Into a reactor equipped with a high speed stirrer and a reflux cooler, 100 g of cyphermethrin, 100 g of methylene chloride, and 20 g of polylactic acid are added thereto, heated to reflux, and then slowly stirred to dissolve. When all are dissolved, slowly add an aqueous solution in which 10 g of sodium dodecyl sulfate and 2 g of xanthan gum are dissolved in 698 g of water to the solution to increase the stirring rotation to maintain 3,000 revolutions per minute. Subsequently, 20 g of NK-KNZ (trade name) and 50 g of glycerin were added and rotated at a high speed for 2 hours to obtain 1,000 g of a ciphermethrin 10% suspension encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 7

Into a reactor equipped with a high speed stirrer and a reflux condenser, 100 g of dichloose, 100 g of acetone, and 20 g of polylactic acid were added thereto, heated to reflux, and then slowly stirred to dissolve. When all are dissolved, slowly add an aqueous solution of 10g of Monopol (trade name) and 2g of NK-DIS20 (trade name) to 698g of water, and increase the stirring speed to maintain 3,000 revolutions per minute. Subsequently, 20 g of NK-KNZ (trade name) and 50 g of glycerin were added thereto, and the mixture was rotated at high speed for 2 hours to obtain 1,000 g of a dichlorbose 10% suspension encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 8

Into a reactor equipped with a high speed stirring device and a reflux cooler, chlorpyruphos 1,000g, acetone 500g, and polylactic acid 200g were added, heated to reflux cooling, and then slowly stirred to dissolve. When all were dissolved, the solution was slowly added with an aqueous solution of 100 g of sodium dodecyl sulfate and 20 g of xanthan gum in 3,000 g of water, increasing the stirring rotation to maintain 3,000 revolutions per minute for 4 hours. After dehydration in a centrifuge and dried, 1,320 g of chlorpyriphos 75% powder was encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 9

1,000 g of diazinone, 100 g of diacetone alcohol, and 200 g of polylactic acid were added to a reactor equipped with a high speed stirring device and a reflux condenser, followed by heating, reflux cooling, and agitation. When all are dissolved, slowly add an aqueous solution in which 100 g of NK-DIS20 (trade name) and 20 g of xanthan gum are dissolved in 3,000 g of water. The stirring speed is increased to maintain 3,000 revolutions per minute for 6 hours. After dehydration in a centrifuge and dried, 1,250 g of diazinon 80% powder was encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 10

Into a reactor equipped with a high speed stirrer and a reflux condenser, 800 g of deltamethrin, 1,000 g of Solvesso, and 200 g of polylactic acid were added, heated, and refluxed. When all were dissolved, the solution was slowly added with an aqueous solution of 100 g of sodium dodecyl sulfate and 20 g of xanthan gum in 3,000 g of water, increasing the stirring rotation to maintain 3,000 revolutions per minute for 4 hours. When dehydrated in a centrifuge and dried to obtain 1120 g of deltamethrin 70% powder encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 11

Into a reactor equipped with a high speed stirrer and a reflux condenser, 800 ml of permethrin, 500 g of acetone, and 200 g of polylactic acid were added, heated, and refluxed. When all were dissolved, the solution was slowly added with an aqueous solution in which 100 g of sodium dodecyl sulfate and 20 g of xanthan gum were dissolved in 3,000 g of water, and the stirring was increased to maintain 3,000 revolutions per minute for 6 hours. When dehydrated in a centrifuge and dried to obtain 1,120 g of a permethrin 70% powder formulation encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 12

Into a reactor equipped with a high speed stirrer and a reflux cooler, phenyltrotion 1,000g, 500 g Kocosol, and 200 g polylactic acid were added and heated to reflux and slowly stirred to dissolve. When all were dissolved, the solution was slowly added with an aqueous solution in which 100 g of sodium dodecyl sulfate and 20 g of xanthan gum were dissolved in 3,000 g of water, and the stirring was increased to maintain 3,000 revolutions per minute for 6 hours. When dehydrated in a centrifuge and dried to obtain 1,320 g of phenytrothion 75% powder encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 13

Into a reactor equipped with a high speed stirring device and a reflux condenser, 1,000 g of cyphermethrin, 400 g of methylene chloride, and 200 g of polylactic acid were added thereto, followed by heating and reflux cooling. When all were dissolved, the solution was slowly added with an aqueous solution in which 100 g of sodium dodecyl sulfate and 20 g of xanthan gum were dissolved in 3,000 g of water, and the stirring was increased to maintain 3,000 revolutions per minute for 6 hours. When dehydrated in a centrifuge and dried to obtain 1,320 g of Cypermethrin 75% powder encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

Example 14

Into a reactor equipped with a high speed stirrer and a reflux cooler, dichlorobos 800g, acetone 200g, and polylactic acid 200g are heated, and refluxed and slowly stirred to dissolve. When all are dissolved, slowly add the aqueous solution of 100g of Monopol and 50g of NK-DIS20 in 3,000g of water to the solution and increase the stirring speed to maintain 3,000 revolutions per minute for 6 hours. When dehydrated in a centrifuge and dried to obtain 1,000 g of dichlorbos 80% powder formulation encapsulated with polylactic acid having an average particle diameter of 10 to 100 microns.

According to the present invention, the encapsulated insecticide drug ingredient is continuously released slowly, thereby reducing the spraying frequency and the spraying amount of the insecticide, thereby reducing the effort and cost according to the natural environmental pollution and the drug spraying due to the drug spraying.

Claims (3)

A biodegradable microencapsulated insecticide comprising an organophosphorus insecticide or a pyrethroid insecticide, an organic solvent and an encapsulating agent as an active ingredient, and polylactic acid and at least one auxiliary agent selected from surfactants, dispersants, viscosity modifiers and water. The method according to claim 1, wherein the organophosphorus insecticide contains 5-60% by weight of chloropyriphos, diazinone, phenytrothion or dichloroboss, or deltamethrin, ciphermethrin or permethrin as pyrethroid insecticide. Biodegradable microencapsulated insecticide, characterized in that containing 30% by weight. The biodegradable microencapsulated insecticide according to claim 1, which is in the form of a suspension prepared by mixing and stirring the components of the insecticide composition, or a powder prepared by dehydrating and drying the suspension.