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Pesticide composition and preparation method thereof

A technology of pesticide composition and liquid medicine, applied in the field of pesticides, can solve the problems of long extraction time, low yield rate and large concentration, and achieve the effects of advanced equipment, simple operation and short time.

Inactive Publication Date: 2016-10-12
钱坚明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a pesticide composition and its preparation method, which can solve the disadvantages of low yield rate in the prior art, resulting in long extraction time, large concentration, high loss, high cost and low benefit

Method used

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  • Pesticide composition and preparation method thereof
  • Pesticide composition and preparation method thereof
  • Pesticide composition and preparation method thereof

Examples

Experimental program
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specific Embodiment approach

[0021] 1. Physicochemical properties of toosendanin:

[0022] Toosendanin:

[0023] Drug Alias: Azadirachtin, Shuguojing, Lubaowei, Azadirachtin

[0024] Plant source: It is the active ingredient extracted from the root bark and bark of Toosendan.

[0025] Molecular formula: C 30 0H 38 o 11

[0026] Molecular weight: 574.63

[0027] Properties: white crystalline powder, melting point 244-245°C (decomposition). Optical rotation -13.1° (c=1.75, acetone). Soluble in pyridine, acetone, ethanol, methanol, slightly soluble in chloroform, benzene, almost insoluble in petroleum ether and water.

[0028] Main Ingredients: Azadirachtin

[0029] Functions and indications: There are roundworms, pinworms and whip.

[0030] Main use: As a botanical insecticide isolated from the bark of Meliaceae and Neem, it has stomach poisoning, contact killing and certain antifeedant effects.

[0031] Action characteristics: After pests eat and contact with toosendanin, it can block the conduc...

Embodiment 1

[0057] Extraction of toosendanin

[0058] First: Take 1 kg of Toosendan powder, sieve it, mesh number: 50 mesh, add 75% 10 liters of alcohol, the ratio of alcohol to powder is 1:10, and put it into an ultrasonic extraction pot. The extraction time is 45 minutes to 1 hour. The wavelength / frequency of the ultrasonic wave is 28Hz, the power is 1500w, and the temperature of the cooling water is controlled between 25°C and 30°C. After the extraction is completed, put down the alcohol liquid, filter the liquid, and filter the solid-liquid separation through a centrifuge to obtain the alcohol liquid. .

[0059]Step 2: Pour the alcohol liquid medicine into a rotary evaporator container for vacuum concentration to recover alcohol. The evaporation temperature of the rotary evaporator is 30-35°C. The water temperature of the condenser is at -5~-8°C, the vacuum degree is -0.99Mpa, and 10 liters of alcohol liquid medicine has been concentrated for 3 hours to 4 hours and all the alcohol h...

Embodiment 2

[0061] Example of method for extracting crotonoleic acid

[0062] First take 1000 grams of croton powder, mix with 8000 mL of petroleum ether (boiling point 60-90 ° C) and put it into an ultrasonic extraction pot. The extraction time is 1 hour, the ultrasonic wavelength is 28 Hz, the power is 1500 W, and the cooling water temperature is controlled between 25-30 ° C. After the end, put down the solution and filter for solid-liquid separation. Precipitate for 12 hours, and then filter through a 120 μm micropore to obtain petroleum ether clear liquid. Pour into a rotary evaporator to concentrate and recover petroleum ether. The evaporator temperature was controlled at 25°C and the condenser temperature was controlled at -8°C. After concentration, 450mL-500mL of pure crotonoleic acid can be obtained. Crotonoleic acid is used as a formula ingredient of pesticides, but its total content in the formula drug is controlled between 3% and 5%.

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Abstract

The invention discloses a pesticide composition. The pesticide composition is prepared from toosendanin, crotonic acid, added limonene, an organosilicon surfactant L-77 and a vegetable oil emulgator. The invention further discloses a preparation method of the pesticide composition. The preparation method comprises the following steps that a toosendanin solution is taken, and it is measured that the density ranges from 1.250 to 1.253; the crotonic acid is poured into water mother liquor, ethyl alcohol with the concentration of 98% or above is added, then limonene is added, and the mixture is placed in an emulsifying machine to be emulsified; in the emulsifying process, the organosilicon surfactant is slowly added, the vegetable oil emulgator is subjected to high-speed shearing and emulsifying through the emulsifying machine, the rotating speed ranges from 7,000 r / min to 8,000 r / min, the emulsifying time is controlled to range from 15 min to 20 min, the vacuum degree is controlled to be -0.92 Mpa, and the cooling water temperature is controlled to range from 20 DEG C to 25 DEG C. Only two plant ingredients, namely, the toosendanin and the crotonic acid are contained in the composition formula of the pesticide composition, so that the active ingredient is high.

Description

technical field [0001] The invention relates to the field of pesticides, more specifically a pesticide composition and a preparation method thereof. Background technique [0002] my country is a big agricultural country, and so far, artificially synthesized chemical pesticides that are not found in nature are still widely used. Since there is no corresponding microbial group in nature, the pesticide residues cannot be degraded, polluting land, water sources and the environment. Pesticide residues enter humans and animals through the food chain and induce various diseases. Furthermore, chemical pesticides have been used for half a century, and the resistance of pests has increased by dozens of times, which has greatly restricted the sustainable development of agriculture in our country. [0003] The quick-acting properties of this type of pesticide in the prior art are average, and the mortality rate of insect pests is not very high. Adjusted for mortality (7 days). Not v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N43/16A01N37/06A01N27/00A01N25/30A01P7/04
CPCA01N43/16A01N25/30A01N27/00A01N37/06A01N2300/00
Inventor 钱坚明
Owner 钱坚明