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Controlled release preparation for killing water hyacinth and preparation method of controlled release preparation

A technology for controlled release preparations and water hyacinth, which is applied in the directions of botanical equipment and methods, chemicals for biological control, herbicides and algaecides, etc. Effect

Inactive Publication Date: 2012-03-28
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the application of controlled-release technology in weed elimination, and there is no report on the application of the field of elimination of tenacious aquatic weeds, especially water hyacinth. The reason is that the preparation and application of controlled-release preparations have not yet There are many technical difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Dissolve 0.05g of polyvinyl alcohol in 100g of distilled water, add 0.5g of superfine talc powder, and stir to obtain an aqueous phase; mix 5g of methyl acrylate, 5g of ethyl acrylate, 1g of ethylene glycol diacrylate, 0.2g Azobisisobutyronitrile, 12g of Bendaron and 20g of butyl acetate were mixed and stirred evenly to obtain an oil phase; the water phase was transferred into the reaction flask, and the oil phase was introduced while stirring, and then stirred at a speed of 600r / min for 20 Minutes, at the same time feed nitrogen to remove the air in the reaction flask; heat up to 70°C, polymerize for 3 hours under nitrogen protection and constant stirring at 400r / min, and filter to obtain controlled-release microspheres with a drug loading of about 27%.

[0039](2) Dissolve 4g of xanthan gum and 40g of polyacrylamide in 1000g of water to prepare an aqueous solution, then add 15g of glutaraldehyde, stir evenly at room temperature, and place it for 24 hours to obtain ...

Embodiment 2

[0044] (1) Dissolve 0.03g carboxymethyl cellulose in 45g distilled water, add 0.3g superfine calcium carbonate, and stir to obtain an aqueous phase; mix 4g α-methyl methacrylate, 8g ethyl acrylate, 0.8g N, N -Dimethacrylamide, 0.15g of azobisisobutyronitrile, 10g of atrazine and 22g of dioxane were mixed uniformly to obtain an oil phase; the water phase was transferred into a reaction flask, and the oil phase was introduced while stirring, and then Stir at a speed of 800r / min for 20 minutes, and at the same time pass nitrogen gas to remove the air in the reaction bottle; heat up to 50°C, polymerize for 4 hours under nitrogen protection and constant speed stirring at 350r / min, and filter to obtain a drug loading of about 22% controlled release microspheres.

[0045] (2) Dissolve 3g of gum arabic and 40g of polymethacrylamide in 1000g of water to obtain an aqueous solution, then add 20g of glyoxal with a mass fraction of 40%, stir evenly at room temperature, and place it for 12 ...

Embodiment 3

[0050] (1) Dissolve 0.04g of hydroxyethyl cellulose in 120g of distilled water, add 0.2g of superfine kaolin, and stir to obtain an aqueous phase; mix 3g of styrene, 7g of ethyl acrylate, and 1.2g of N,N-dimethylpropylene Amide, 0.18g benzoyl peroxide, 16g propanil and 12g methyl ethyl ketone were mixed evenly to obtain the oil phase; the water phase was transferred into the reaction bottle, and the oil phase was introduced while stirring, and then stirred at a speed of 700r / min for 25 minutes , and at the same time feed nitrogen to remove the air in the reaction flask; heat up to 80°C, polymerize for 2 hours under nitrogen protection and constant stirring at 300r / min, and filter to obtain controlled-release microspheres with a drug loading of about 40%.

[0051] (2) 5g xanthan gum, 20g polyacrylamide and 20g polyacrylic acid are dissolved in 1000g water to obtain an aqueous solution, then 15g of glyoxal with a mass fraction of 40% is added therein, stirred evenly at room tempe...

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PUM

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Abstract

The invention discloses a controlled release preparation for killing water hyacinth and a preparation method of the controlled release preparation. The preparation method comprises the steps of: firstly, mixing a dispersing agent with water to prepare a water phase, mixing with an oil phase prepared from a polymer monomer, a weed killer, an initiating agent and a release rate regulating agent, stirring under an inert atmosphere for reacting for 2-6h, filtering to prepare a controlled release microsphere; dissolving a functional micromolecule in water, adding a cross-linking agent to be uniformly stirred and then placing for 12-24h to prepare a multifunctional medium, wherein the multifunctional medium has a suspension capacity and an adhesion film-forming capacity on the controlled release microsphere; and adding the controlled release microsphere in the multifunctional medium to be uniformly mixed to obtain the controlled release preparation. The controlled release preparation is sprayed on the leaf of the water hyacinth, the multifunctional medium is used for adhering the microsphere on the leaf, and the weed killer in the microsphere is dispersed to the leaf to ensure that the weed is wilted or killed. By using the medicine carrying stability and the controlled release characteristics of the controlled release microsphere, the weed killing efficiency of the weed killer can be increased, and the actual dosage of the weed killer can be reduced to 0.02g / m<2> so that the treatment cost of the water hyacinth is reduced.

Description

technical field [0001] The invention belongs to the intersecting field of functional polymer materials and invasive plant control, and particularly relates to a controlled-release preparation for eliminating water hyacinth and a preparation method thereof. Background technique [0002] In recent years, water hyacinth has become one of the top ten harmful weeds recognized internationally, which has caused serious ecological damage to many water areas and brought huge economic losses to the society. In foreign countries, the use of herbicides often leads to the death of amphibians, so it is not respected. In foreign countries, biological control methods are mainly used to control water hyacinth. Among them, water hyacinth weevil is the natural enemy insect of water hyacinth. , Thailand and other countries and regions introduced the insect, and achieved good results. There are also various methods such as plant pathogens to control water hyacinth. There have been preliminary e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/04A01N47/36A01N43/70A01N37/22A01P13/00
Inventor 王正辉石花蕾王青
Owner SOUTH CHINA AGRI UNIV
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