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A highly stable degradable natural pyrethrin emulsion and its preparation method

A technology of natural pyrethrins and pyrethrins, applied in the field of pesticides, can solve the problems of decreased quick-acting properties and achieve low cost, stable performance and good safety

Active Publication Date: 2017-12-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after microencapsulated pesticides are coated, their quick-acting properties tend to decrease (Chinese invention patent ZL201210034629.9)
There is no report on the use of polyaspartic acid as a natural pyrethrin dispersant

Method used

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  • A highly stable degradable natural pyrethrin emulsion and its preparation method
  • A highly stable degradable natural pyrethrin emulsion and its preparation method
  • A highly stable degradable natural pyrethrin emulsion and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Preparation of Emulsion in Water of Natural Pyrethrins

[0050] Preparation process: Weigh 5g of natural pyrethrins (hereinafter referred to as PS), 5g of ethyl acetate (hereinafter referred to as EAC), and 50g of ethanol (Ethanol, hereinafter referred to as ET) into the container in sequence, stir and mix thoroughly uniform. Then add 0.1 g of polyaspartic acid (Polyaspartic Acid, hereinafter referred to as PASP) to the system, add 10 g of water, and mix uniformly to obtain a stable dispersion containing 5% of natural pyrethrins. Take 0.001g of Kenyan tea extract (the main active ingredient is tea polyphenols, Tea Polyphenols, hereinafter referred to as TP), add the remaining proportion of water, stir thoroughly at 600-900 rpm for 10-30 minutes until evenly mixed, and prepare 100g of natural pyrethrum vegetarian lotion. The above prepared emulsion was subjected to various performance test experiments of pesticide water emulsion, and its various test results...

Embodiment 2

[0051] Example 2: Preparation of water emulsion of natural pyrethrins

[0052] Preparation process: Take 0.1 g of natural pyrethrins, 0.2 g of ethyl acetate, and 15 g of ethanol in sequence, and add them into the container according to the amount, and mix well. Then, 0.005 g of polyaspartic acid and 10 g of water were added to the system, and mixed uniformly to obtain a stable dispersion containing 0.1% of natural pyrethrins. Take 0.0001g of Kenya tea extract, add the remaining proportion of water, stir at 600-900 rpm for 10-30 minutes until fully mixed, and prepare 100g of natural pyrethrin emulsion.

[0053] The above prepared emulsion was subjected to various performance test experiments of pesticide water emulsion, and its various test results are shown in Table 1.

Embodiment 3

[0059] Example 3: Drug efficacy test of natural pyrethrin emulsion

[0060] Drug efficacy test: The drug efficacy test of natural pyrethrin emulsion adopts the mosquito resistance detection method-biological assay method (GB / T 26347-2010). According to the mortality rate of the mosquito population to be tested under the diagnostic dose as the criterion for judging the resistance. Among them, LC 50 Indicates the drug concentration when 50% of the tested animals died, LC 90 Indicates the dose concentration when 90% of the tested animals died. Drug efficacy test according to the regulations of GB / T 26347-2010, the 4th instar larvae of Culex pipiens and Aedes albopictus were used as the mosquito population to be tested. The test results are shown in Table 2.

[0061] content

Culex papillosa

Aedes albopictus

LC 50 Average (ppm)

0.0643

0.1874

LC 90 Average (ppm)

0.1651

0.2877

[0062] Note: The data is the average of 3 tests. ...

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Abstract

The invention relates to a natural pyrethrin emulsion high in stability and a preparing method thereof. The natural pyrethrin emulsion is prepared from, by mass, 0.05%-8% of natural pyrethrin, 0.05%-5% of ethyl acetate, 15%-60% of ethyl alcohol, 0.001%-0.5% of poly-aspartic acid, 0.0001%-1% of Kenya tea extract and the balance water. The materials are fully mixed under the normal temperature and the normal pressure to form the uniform and stable emulsion. The natural pyrethrin is natural plant extract and can be degraded in the natural environment, and thus the environmental toxicity of pesticide is eliminated; ethyl acetate serves as a complex solubilizer; poly-aspartic acid serves as a synergic dispersing agent.

Description

technical field [0001] The invention relates to the technical field of pesticides, in particular to an environment-friendly insecticide emulsion of a natural pyrethrin preparation and a preparation method thereof. Background technique [0002] With the acceleration of the process of agricultural industrialization, the production and use of pesticides in my country is increasing year by year. At present, the pesticides allowed to be used in my country mainly include organophosphorus, organochlorine, pyrethroids and carbamates. According to the summary of national agricultural statistics, the national pesticide output reached 3.744 million tons in 2014 alone. However, due to the low utilization efficiency of pesticides, about 80% of pesticides will enter the environment, causing water, air, soil, food pollution, and inducing pests to develop resistance. The 2015 Central Document No. 1 "Several Opinions on Intensifying Reform and Innovation to Accelerate Agricultural Moderniz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N65/08A01N53/10A01N25/04A01P7/04
CPCA01N25/04A01N53/00A01N65/00A01N65/08A01N2300/00
Inventor 李风亭王颖张冰如刘汨莎
Owner TONGJI UNIV