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Neem oil micro-capsule and preparation thereof

A technology of neem oil and microcapsules is applied in the fields of botanical equipment and methods, chemicals for biological control, animal repellents, etc., which can solve the problems of prolonging the effective action time and single dosage form, and achieves prolonging the effective action. Time, easy to decompose, and the effect of broad application prospects

Inactive Publication Date: 2008-11-05
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the registered products are compound preparations with neem oil as the main component or containing neem oil. For example, the patent application with application number 00114227.5 discloses the combination of neem oil with various surfactants, preservatives, and stabilizers. , organic solvents, etc. are formulated into three dosage forms of emulsifiable concentrate, wettable powder, and suspending agent, thereby solving the shortcomings of a single dosage form, but they are all made by adding preservatives, antifreeze agents, stabilizers, etc. to make neem oil easy to store. Effect
It has not been seen that neem oil itself is used as an insecticide, and it is coated in the microcapsule body, so that it can be released slowly through the semi-closed capsule wall, while maintaining the stability to light and heat, it also maintains its biological activity Unchanged, patent application for inventions and products sold to prolong their effective time of action

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Add 1.5 parts by weight of neem oil to 2.0 parts by weight of TDI, and stir for 5 minutes at a speed of 400 r / min at room temperature to form a uniform liquid;

[0048] (2) Under stirring at a rotating speed of 450r / min, add the above-mentioned homogeneous liquid to 50 parts by weight of 3% (weight) PVA aqueous solution, and continue stirring for 30 minutes;

[0049] (3) Slowly add a small amount of glycerol into the above mixed solution, and continue to stir for 30 minutes;

[0050] (4) adjust the pH of the above-mentioned mixed solution to make it pH=6~7, let it stand for 10min, filter, and the gained filter cake is dried at normal temperature to obtain the product of the present invention, and its raw material consumption and embedding rate are listed in the following table 1. The product is a regular spherical particle with a diameter of 10-200 microns.

Embodiment 2～8

[0052] Except changing the consumption of neem oil, TDI, PVA aqueous solution and PVA aqueous solution concentration, other implementation conditions are identical with embodiment 1. The dosage and embedding rate of each raw material in these examples are listed in Table 1 below, and the products are all regular spherical pale yellow particles with a diameter of 10-200 microns.

[0053] Table 1

[0054]

Embodiment 9

[0056] (1) Add 1.0 parts by weight of neem oil to 30 parts by weight of 1.00% (weight) sodium alginate aqueous solution, and stir for 5 minutes at a speed of 400 r / min at room temperature to form a uniform liquid;

[0057] (2) under stirring at a rotating speed of 300r / min, add the above-mentioned uniform liquid to 50 parts by weight of 2% (weight) calcium chloride aqueous solution, and continue to stir for 40min;

[0058] (3) Then adjust the pH of the solution to make it pH=6-7, let it stand for 10min, filter, and the gained filter cake is dried at normal temperature to obtain the product of the present invention, and its raw material consumption and embedding rate are listed in the following table 2 , the product is regular or irregular light yellow spherical particles with a diameter of 10-200 microns.

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PUM

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Abstract

The invention provides a botanical insecticide: neem oil microcapsule, and comprises 50.23 to 73.29 percent of neem oil and 26.71 to 49.77 percent of capsule wall material; wherein, the capsule wall material is prepared by one or a plurality of isocyanate, polyvinyl alcohol, polyethylene glycol, polyvinyl acetal, glycerol, sodium alginate and calcium chloride. The invention also provides a preparing method for the neem oil microcapsule; under the condition of keeping the constant bioactivity, the effective acting time of the neem oil after microencapsulation is 2.5 times compared with the neem oil which is not processed.

Description

[0001] The application of the present invention is a divisional application of 200510126414.x, the application date of the original application is December 8, 2005, the application number is 200510126414.x, and the title of the invention is: neem oil microcapsules and its preparation method. technical field [0002] The invention relates to a plant pesticide and a preparation method thereof, in particular to a microcapsule neem oil insecticide and a preparation method thereof. Background technique [0003] The effective insecticidal component of neem oil is azadirachtin (azadirachtin), which was first extracted from its neem seeds by Butterworth et al. in 1968, and its molecular formula is C 32 h 42 o 10 , is a tetracyclic triterpenoid with a series of isomers. Many studies have shown that azadirachtin has strong insecticidal, antifeedant, inhibiting the growth of pests, delaying insect oviposition, inhibiting insect hormone secretion, reducing insect fertility and fitness...

Claims

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Application Information

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IPC IPC(8): A01N25/28A01N65/00A01P7/00
CPCY02A50/30
Inventor 谷文祥莫莉萍
Owner SOUTH CHINA AGRI UNIV
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