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Compsn. of agricultural pesticide and preparation method

A pesticide composition and the technology of the composition are applied in botany equipment and methods, animal repellants, plant growth regulators, etc., and can solve problems such as poor adsorption of loess, easy formation of clumps, and influence on drug efficacy

Inactive Publication Date: 2005-11-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But all these inorganic additives, because of their own deficiencies, when used as pesticide additives, have poor uniform distribution, are easy to form agglomerates, and affect drug efficacy, so they are not ideal.
For example, diatomite has poor adsorption and slightly higher hardness; bentonite has low hardness; loess has poor adsorption, low hardness and poor suspension, etc.
The main purpose of these inorganic additives is to use as pesticide dispersants and adsorbents, which cannot meet the slow release requirements of users.
[0008] As mentioned above, the deficiencies of medicines in traditional technology have caused great harm to users and producers, and have great limitations on the use of medicines
[0009] Therefore, there is a need in the prior art for a more effective pesticide composition with sustained release, which has a longer sustained release time and does not react with the active ingredients of the pesticide

Method used

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  • Compsn. of agricultural pesticide and preparation method
  • Compsn. of agricultural pesticide and preparation method
  • Compsn. of agricultural pesticide and preparation method

Examples

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preparation example Construction

[0046] hollow porous SiO 2 The preparation of nanoparticles is described in detail in the applicant's prior Chinese patent application: 02160383.9, which is hereby incorporated by reference in its entirety.

[0047] Specifically, the hollow porous SiO of the present invention 2 The preparation method of nanoparticle comprises the following steps:

[0048] (1) Add 1.5-30% surfactant to the inorganic template suspension selected from calcium carbonate, magnesium carbonate or barium carbonate, and then add a certain amount of organic solvent such as ethanol or methanol.

[0049] (2) Under alkaline conditions, add a silicon source to the mixture of step (1) including organosilicate such as ethyl orthosilicate or inorganic silicon such as sodium silicate, and its hydrolyzate or polymer deposits into the surfactant to form A hexagonal array of , wrapped around the rod-like micelles formed by the surfactant, constitutes the walls of the mesopores.

[0050] (3) filter the suspensio...

preparation Embodiment 1

[0469] Spherical hollow porous SiO 2 Preparation method of nanoparticle (thin-shell nanometer mesoporous sphere)

[0470] Take by weighing 40nm calcium carbonate powder (cubic) 8.7g, add deionized water 50g, add 2.5g cetyltrimethylammonium bromide (CTMAB) and 13.2g (about 15ml) analytical pure ammonia water, Then add 60g of ethanol, stir for 15min at a rotating speed of 300rpm, add tetraethyl orthosilicate (TEOS) according to silicon dioxide / calcium carbonate=0.15 (weight ratio), stir for 2 hours, filter and wash the filter cake with an appropriate amount of ethanol. Dry in an oven at a temperature of 90°C, and bake in a muffle furnace at a temperature of 550°C for 5 hours. Dissolve the sample with dilute hydrochloric acid, keep the pH below 1, and dry to obtain the product.

preparation Embodiment 2

[0472] Tubular hollow porous SiO 2 Preparation method of nanoparticles (mesoporous hollow tube)

[0473] Weigh 8.7g of calcium carbonate powder (needle) with a diameter of 200-300nm and an aspect ratio of 5, add 50g of deionized water, add 2.5g of cetyltrimethylammonium bromide (CTMAB) and 13.2g ( About 15ml) to analyze pure ammonia water, then add 60g ethanol, stir for 15min at a rotating speed of 300rpm, add tetraethyl orthosilicate (TEOS) according to silicon dioxide / calcium carbonate=0.2 (weight ratio), stir for 2 hours, filter, filter The cake was rinsed with an appropriate amount of ethanol, dried in an oven at a temperature of 90°C, and baked in a muffle furnace at a temperature of 550°C for 5 hours. Dissolve the sample with dilute hydrochloric acid, keep the pH below 1, and dry to obtain the product.

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Abstract

A composite agricultural chemical is composed of the active component and hollow porous SiO2 nanoparticles. Its preparing process is also disclosed. It may be liquid, emulsion, powder, or dry suspension.

Description

field of invention [0001] The present invention relates to a kind of nanopesticide controlled-release agent and preparation method thereof; Specifically, the present invention relates to a kind of pesticide composition, and it comprises pesticide active ingredient and hollow porous SiO 2 particles. Background technique [0002] Pesticides must go through a certain processing process to form a certain form of preparation before they can be applied. The quality of the formulation directly affects the effect and application of the pesticide. If the pesticide with a short lifespan is stored in a dosage form, the pesticide should be controlled to reach the required place continuously and stably within a certain period of time according to the necessary dose, so as to maintain a sufficient residual period and make full use of the pesticide. The technology that can control the effective dose of pesticides to reach the required place within the necessary time is called controlled r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/08
Inventor 陈建峰文利雄李珠柱
Owner BEIJING UNIV OF CHEM TECH
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