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Microcapsule preparation, soil nematode prevention and control microcapsule suspending agent, and preparation method of microcapsule preparation

A microcapsule suspension, microcapsule technology, applied in nematicides, botanical equipment and methods, biocides, etc., can solve the problems of difficult to control release rate, unsatisfactory field efficacy, and short duration of effect, etc. To achieve the effect of reducing the cost of prevention and treatment, reducing the frequency of medication, and prolonging the duration of the effect

Inactive Publication Date: 2017-07-14
SHANDONG ACADEMY OF PESTICIDE SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although there are reports on the preparation of microcapsules by in-situ polymerization or interfacial polymerization, there are generally problems such as difficulty in controlling the release rate and unsatisfactory drug efficacy in the field. Problems such as duration of validity are too short, the purpose of the present invention is exactly in order to coordinate the relationship between the two

Method used

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  • Microcapsule preparation, soil nematode prevention and control microcapsule suspending agent, and preparation method of microcapsule preparation
  • Microcapsule preparation, soil nematode prevention and control microcapsule suspending agent, and preparation method of microcapsule preparation
  • Microcapsule preparation, soil nematode prevention and control microcapsule suspending agent, and preparation method of microcapsule preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, in-situ polymerization method 0.25% tropane base microcapsule suspension

[0044] Dissolve 2.5 parts of tropane alkali crude oil in 2 parts of methyl oleate to obtain the core oil phase, add it to 60 parts of UF aqueous solution (5%), add 2 parts of emulsifier PVA and 2 parts of dispersant NNO; stir at 1000r / min Disperse into an O / W emulsion; slowly adjust the pH to 2.5 with 1moL / L HCl, then gradually raise the temperature to 60°C for 90 minutes, and solidify into capsules. After reaching the end of the reaction, adjust the pH to ≈7 with sodium hydroxide.

[0045] Then add 5 parts of wetting agent NP-10, 4 parts of dispersant NNO and 4 parts of sodium hydroxymethyl cellulose, a structure regulator, make up to 1000 parts with deionized water, and stir evenly, which is 0.25% tropane base microcapsule suspension.

[0046] Microcapsule average particle size d(μm) Microcapsule wall thickness (μm) 5.31 0.42

Embodiment 2

[0047] Example 2, in-situ polymerization method 2.0% tropane base multi-capsule wall thickness microcapsule suspension.

[0048] (1) Preparation of urea-formaldehyde resin prepolymer aqueous solution: Mix and dissolve 10 parts of urea and 24 parts of formaldehyde, add 42 parts of deionized water, adjust the pH to 8.0, and keep it at 70°C for 1 hour to obtain a mass fraction of 25% urea-formaldehyde resin prepolymer. polymer (UF) solution.

[0049] (2) preparation of killing thread microcapsules:

[0050] a: 20 parts of tropane base crude oil are dissolved in 5 parts of methyl oleate to obtain the capsule core oil phase, join in 60 parts of 5% UF aqueous solution (5% refers to the mass fraction of urea-formaldehyde resin prepolymer UF, by step (1 ) obtained by diluting the 25% urea-formaldehyde resin prepolymer solution obtained in ), the same below), adding 3 parts of emulsifier OP-10 and 2.5 parts of dispersant NNO; stirring and dispersing at 1000r / min into an O / W emulsion; ...

Embodiment 3

[0063] Example 3, in-situ polymerization method 2.5% tropane base multi-capsule wall thickness microcapsule suspension.

[0064] Method is the same as example 2, gets 25 parts of tropane alkali crude oils in the preparation process, agent a: 60 parts of UF prepolymers (3%), emulsifier OP-104 parts, dispersant agent sodium lignosulfonate 1.5 parts; Agent b: UF prepolymer (5%) 60 parts, emulsifier OP-104 parts, dispersant sodium lignosulfonate 2 parts; agent c: UF prepolymer (8%) 60 parts, emulsifier OP-104 parts, dispersant 2 parts of agent sodium lignosulfonate; Other process is the same as embodiment 1, is processed into 2.5% tropane alkali polycystic wall thickness microcapsule suspending agent.

[0065] Its particle size and capsule wall thickness are shown in the table below:

[0066]

[0067] Preparation examples of matrine microcapsules:

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Abstract

The present invention provides a processing preparation method of a soil nematode prevention and control microcapsule-containing suspending agent. According to the present invention, hyoscyamine and other soil nematode prevention and control microcapsules are prepared by using the existing in-situ polymerization method or interfacial polymerization method, and mixing according to a certain ratio is performed to prepare the microcapsule-containing suspending agent, wherein the release rate of the microcapsule is controlled according to different mixing ratios; and the preparation has advantages of high initial release rate, long lasting period, high effective pesticide utilization rate, environment protection, low phytotoxicity, eluviation reducing, low environment pollution, and the like.

Description

technical field [0001] The invention belongs to the field of processing and application of pesticide formulations, and relates to the improvement technology of pesticide microcapsules. Background technique [0002] At present, the more environment-friendly soil nematode control agents mainly include biogenic nematicides such as tropane, matrine, and veratridine, as well as chemical nematicides such as thiazophos and abamectin, and sulfuryl chloride. And other gas nematicides. [0003] At present, soil control nematodes such as tropane alkali are mainly processed into emulsifiable concentrate for use in China. Due to the large amount of organic solvent used, the damage to the environment is serious; and due to the high initial drug concentration, it is easy to cause phytotoxicity to crops. , the duration becomes shorter. [0004] Due to the protective effect of the capsule wall, the pesticide microcapsule suspension reduces the influence of the capsule core pesticide from t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/28A01N25/04A01N43/90A01P5/00
CPCA01N25/28A01N25/04A01N43/90A01N2300/00
Inventor 庄占兴郭雯婷庄治国崔蕊蕊范金勇刘钰徐娜娜徐英王龙龙
Owner SHANDONG ACADEMY OF PESTICIDE SCI
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