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Photodegradation nano imidacloprid micro-capsules preparation method

A technology of imidacloprid and photodegradation, applied in the fields of botanical equipment and methods, chemicals for biological control, animal repellents, etc. Inexpensive, good application prospects, good reproducibility

Inactive Publication Date: 2009-06-17
迟德富 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main difficulties in related research are: (1) Nano-microcapsules are prepared by emulsification and adsorption methods without adding photodegradable substances; these types of products are easy to inactivate, difficult to store, and difficult to degrade, resulting in residual pollution of pesticides

Method used

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preparation example Construction

[0039] (3) Preparation of photodegradable carrier: a certain concentration of Ti(SO 4 ) 2 Nano-TiO was obtained through the steps of hydrolysis, coagulation, seeding and roasting 2 , to adjust the pH value, 1-10g nano-TiO 2 Add to 1L of deionized water, add 1-5g of sodium dodecylsulfonate (SDS) powder, dry to powder, grind for 30s, and prepare SDS / TiO 2 , to adjust the pH, the TiO 2 In the aqueous solution, add AgNO with a volume concentration of 0.01-0.05mol / L 3 solution, into H 2 Reduced Ag + ions, making Ag / TiO 2 . SDS modified Ag / TiO 2 Photocatalyst, dried at 100°C to obtain SDS / Ag / TiO 2 , the photocatalyst is mixed with nano-imidacloprid, adsorbed to obtain photodegradable nano-imidacloprid.

[0040] The recrystallization organic reagent is a water-miscible organic solvent such as acetone, ethanol, methanol, etc.

[0041] The polyanions are sodium alginate, dextran sulfate, and sodium carboxymethylcellulose.

[0042] The polycations are chitosan, polyarginine ...

Embodiment 1

[0045] (1) Crystal recrystallization of imidacloprid original drug: Dissolve 0.1-1g imidacloprid original drug in 50mL acetone reagent, stir magnetically for 1h, and add 200mL containing 0.025% (m / v) hydroxypropyl methylcellulose immediately after the dissolution is complete (HPMC) deionized water, magnetic stirring. Use probe-type ultrasound to adjust the particle size of imidacloprid pesticide crystals, the ultrasonic time is 0-10 minutes, the particle size is 0.1-100 microns, and the recrystallized crystals of imidacloprid original drug are obtained.

[0046] (2) Preparation of nano-imidacloprid by LBL method: Disperse 10 mg-100 mg of recrystallized crystals of the obtained imidacloprid original drug in 500 μL of deionized water, add 1 mL of chitosan cationic polyelectrolyte chitosan solution 0.5-5 mg / mL, and ultrasonically adsorb for 5 —15min, after two cycles of centrifugation-removal of supernatant-washing-oscillation, add 1mL of sodium alginate solution of sodium algina...

Embodiment 2

[0049] (1) Crystal recrystallization of imidacloprid original drug: Dissolve 0.1-1g imidacloprid original drug in 50mL ethanol organic reagent, stir magnetically for 1h, and add 200mL containing 0.025% (m / v) hydroxypropyl methylcellulose immediately after the dissolution is complete Primer (HPMC) deionized water, magnetic stirring. Use probe-type ultrasound to adjust the particle size of imidacloprid pesticide crystals, the ultrasonic time is 0-10 minutes, the particle size is 0.1-100 microns, and the recrystallized crystals of imidacloprid original drug are obtained.

[0050] (2) Preparation of nano-imidacloprid by LBL method: Disperse 10 mg-100 mg of recrystallized crystals of the obtained imidacloprid technical drug in 500 μL deionized water, add 1 mL of polyarginine cationic polyelectrolyte chitosan solution 0.5-5 mg / mL, and ultrasonically adsorb 5-15min, after two cycles of centrifugation-removal of supernatant-water washing-oscillation, add 1mL dextran sulfate anionic po...

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Abstract

The invention relates to a photodegradation nanometer imidacloprid microcapsule preparing method comprising re-separating out agricultural chemicals in the form of crystal according that agricultural chemical imidacloprid has different dissolvability in different solvents, and modulating particle size by employing a probe type ultrasonic method or a vibration method.Imidacloprid micro-aggregation is used as template particles, two kinds of bioavailability polymers having opposite electric charges are used as a wall material, according to the principle that charges with opposite electrical signs attract each other, a paper-thin protective outer membrane is formed on the surface of the imidacloprid micro-aggregation, therefore, the imidacloprid microcapsule can be obtained.Preparing of nanometer photocatalyst TiO2 comprises using SDS and Ag+ to modulate the photodegradation activity of TiO2. According to physical demand, photodegradation nanometer imidacloprid is prepared by selecting an appropriate nanometer photocatalyst. The invention has characteristics of simple technique, moderate reaction condition, simple operation, good repeatability and good environment, provides a matter base and a technique guarantee for the development of high-efficient green agricultural chemicals, and has a favorable application prospect.

Description

technical field [0001] The invention belongs to the field of pesticide preparations, in particular to a preparation method of imidacloprid sustained-release microcapsules. Background technique [0002] At present, pesticides are widely used in agriculture as insecticides and herbicides, and play an important role in stabilizing and increasing grain production worldwide. In recent years, with the enhancement of people's awareness of environmental protection and the increase of pesticide poisoning incidents, the problem of pesticide residues has aroused great concern. Many broad-spectrum and high-efficiency insecticides (such as 666, DDT, etc.) have been abandoned by people because they cannot be degraded by the environment. It is imperative to develop degradable broad-spectrum and high-efficiency pesticides. Nanotechnology is widely used in agriculture, especially food processing and traditional agricultural transformation. Nano-material immobilized enzymes are used in foo...

Claims

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Application Information

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IPC IPC(8): A01N25/32A01N51/00A01P7/00
Inventor 迟德富关桦楠宇佳李晓灿
Owner 迟德富
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