Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Preparation method of fosthiazate microcapsule suspension

A technology of microcapsule suspending agent and thiazophosphine, which is applied in the fields of botanical equipment and methods, biocides, biocides, etc., can solve the problems of reducing the control effect of pesticides, short duration of effect, etc. Long release period, easy-to-control effects

Pending Publication Date: 2014-09-24
河北三农农用化工有限公司
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation is friendly to the environment, and the pests are not easy to develop drug resistance. It has become the focus of research and development at home and abroad in recent years. The traditional pesticide formulations are prone to failure under the action of the external environment due to the existence of active ingredients, and the duration of the effect is short, reducing the control effect of pesticides. Therefore, the development of pesticides needs to focus on solving the problem of new formulations of pesticides in order to improve the control effect of pesticides

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of fosthiazate microcapsule suspension
  • Preparation method of fosthiazate microcapsule suspension
  • Preparation method of fosthiazate microcapsule suspension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of capsule material

[0027] Take by weighing 40.0kg urea and 97.3kg mass ratio concentration be the formaldehyde (n urea:n formaldehyde=1:1.8) of 37% and mix, use NH 4 Adjust the pH value of the Cl solution to 8-8.5, and slowly heat it to 70°C, and continue to stir for 1 hour under heat preservation to obtain a viscous and transparent solution substance. Add 194.6kg of distilled water to prepare a urea-formaldehyde prepolymerization with a mass ratio concentration of 28%. The aqueous solution of the substance is obtained as the capsule material.

[0028] 2. Formation of microcapsules

[0029] Add 3 to 5 drops of tributyl phosphate to 45 kg of thiazole phosphorus crude oil at room temperature, stir evenly and add to a container containing 45 kg of capsule material, then add 2.5 kg of styrene-maleic anhydride sodium salt with a mass ratio concentration of 30%, 2.5kg sodium alginate and 2.5kg sodium polyacrylate, 1500r·min -1 Stir for 20min to form a sta...

Embodiment 2

[0031] Add urea and formaldehyde (the molar ratio is about 1:1.5) into a three-neck flask equipped with a stirring device, and adjust the pH value of the solution to about 8-9 with sodium hydroxide solution. The temperature is raised to 70-80° C. to obtain a stable urea-formaldehyde resin prepolymer, and the amount of distilled water is twice that of formaldehyde to prepare a capsule material with a mass ratio concentration of 25-35%. Take 25g of thiazole phosphorus crude oil and 40g of capsule material into a 250ml three-necked flask, add 0.5g of octylphenol polyoxyethylene ether, 3g of sodium dodecylbenzene sulfonate, 1.5g of polyvinyl alcohol, 1300r min -1 Stir for 25 minutes to form a stable O / W emulsion; then reduce the speed to 600-1300r min -1 Add 4% (mass ratio) of acetic acid in batches within 60 minutes to adjust the pH value to 2.5, and polycondensation reaction occurs; gradually raise the temperature to 40-60°C to solidify the capsule wall; add sodium hydroxide to ...

Embodiment 3

[0033]Get 100 g of gelatin, add distilled water, and prepare a gelatin aqueous solution with a mass ratio concentration of 10%. Take 25g of gelatin aqueous solution, keep the temperature at 40°C, pH=7; mix 15g of thiazolphos, 8g of Tween-20, and 8g of diethylamine evenly, and add it to the gelatin aqueous solution under stirring. Continue to keep the temperature at 40°C, stir and add 25g of gum arabic aqueous solution with a mass ratio concentration of 10% to mix, stir and add acetic acid solution with a concentration of 10% until the pH value of the mixed system is 4.0, at this time, the viscosity of the sol increases gradually. become opaque. As a result, the original oil-in-water two-phase system was transformed into a coacervated phase that gathered around thiazophos and formed a coating. After the condensed phase is formed, let the mixture system leave the water bath to cool naturally to room temperature, and then cool the system to 5-10°C with an ice-water bath, keep it...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a preparation method of a fosthiazate microcapsule suspension. The preparation method comprises the following steps: after mixing urea and formaldehyde, adding distilled water to obtain a stable urea-formaldehyde prepolymer water solution; dissolving fosthiazate in an inorganic solvent, adding an emulsifying agent solution, and stirring to form a stable fosthiazate oil-water emulsion; and adding the urea-formaldehyde prepolymer water solution in the fosthiazate oil-water emulsion, stirring to ensure that urea-formaldehyde prepolymer is dissolved in a dispersion medium of the emulsion, slowly regulating a pH for performing a condensation polymerization, then adding a dispersing agent, and stopping the reaction after a warming reaction, regulating a pH value of a reactant, filtering, centrifuging and drying after cooling to prepare the fosthiazate microcapsule suspension. Compared with the prior art, the preparation method adopting a microcapsule technology has the advantages that an active material coats a macromolecule based material so as to be slowly released, thus the dry utilization efficiency is increased and the drug release period is controlled and prolonged, and the advantages of high efficiency, low toxicity, low residue, environment friendliness, and the like are also realized.

Description

technical field [0001] The invention relates to a preparation method of thiazophosphine microcapsule suspension, belonging to the technical field of pesticide preparations. Background technique [0002] Due to the development of science and technology and the strict requirements for environmental protection today, higher requirements have to be put forward for the conventional preparations of conventional pesticides. Global crops are threatened by pests and diseases every year, and the loss is about 1 / 3. Everyone knows that thiazophosphine needs a lot of benzene or ketone solvents to make emulsifiable concentrate. The emulsifiable concentrate is not only expensive but also pollutes the environment. It wastes a lot of chemical raw materials and is very uneconomical. Therefore, the country does not promote emulsifiable concentrate products. EC not only causes huge pollution to soil, water body and atmosphere, but also increases pesticide residues in agricultural by-products, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/04A01N25/28A01N57/32A01P5/00
Inventor 刘书延王莎
Owner 河北三农农用化工有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com