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Pendimethalin micro-capsule suspending agent and preparation method thereof

A technology of pendimethalin and microcapsule suspension, applied in botany equipment and methods, biocides, biocides, etc., can solve problems such as polluting equipment, affecting users, and easy coloring of liquid preparations, and achieves low cost Inexpensive, prevents aggregation of microcapsules, and improves long-term storage stability

Active Publication Date: 2016-08-24
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the defects existing in the prior art, the object of the present invention is to provide a kind of pendimethalin microcapsule suspension and preparation method thereof, the method uses polyurea or polyurethane as capsule wall by interfacial polymerization, pendimethalin Pendimethalin is used as the capsule core, and suitable emulsifiers, dispersants, etc. are selected to prepare pendimethalin microcapsule suspensions, which overcomes the defects of emulsifiable concentrates and suspensions, and at the same time solves the problems that liquid preparations are easy to color, pollute equipment, and affect users.

Method used

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  • Pendimethalin micro-capsule suspending agent and preparation method thereof
  • Pendimethalin micro-capsule suspending agent and preparation method thereof
  • Pendimethalin micro-capsule suspending agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、10

[0079] Embodiment 1, 10g / L pendimethalin microcapsule suspension

[0080] According to the dosage in Table 1, heat pendimethalin (active ingredient 10g) to a molten state, add 10g toluene diisocyanate (vesicle wall material monomer), stir well and then add 100g AEO-10 ​​(emulsifier) , mix the three evenly to prepare an oil phase;

[0081] Add 10g of ethylenediamine (vesicle wall material monomer), 50g of glycerol (antifreeze), 30g of Morwet D-425 (dispersant) and 15g of SAG 1522 (defoamer) in distilled water in sequence, and stir evenly to prepare water Mutually;

[0082] The oil phase and the water phase were respectively kept warm under a constant temperature water bath at 60°C to prevent the pendimethalin original drug from being precipitated when cold, and after the oil phase and the water phase were mixed, shear emulsification at 10000rpm for 1.5min (D 50 controlled at 5 μm to 7 μm), to prepare an oil-in-water emulsion;

[0083] Heat the prepared oil-in-water emulsion ...

Embodiment 2

[0093] Embodiment 2.50g / L pendimethalin microcapsule suspension

[0094] According to the dosage in Table 3, the former drug of pendimethalin (50 g of active ingredient) was heated to a molten state, 90 g of diphenylmethane diisocyanate (vesicle wall material monomer) was added, and 20 g of OP-10 was added after stirring evenly. Mix the three evenly to prepare an oil phase;

[0095] Add 10g of pentaerythritol (capsule wall material monomer), 50g of urea (antifreeze), 20g of Emulsogen 3510 (dispersant) and 10g of polyether defoamer (defoamer) in deionized water in sequence, and stir evenly to prepare an aqueous phase;

[0096] The oil phase and the water phase were kept warm in a constant temperature water bath at 60°C, and after mixing the oil phase and the water phase, shear emulsified at 5000rpm for 2.5min (D 50 controlled at 4 μm to 7 μm), to prepare an oil-in-water emulsion;

[0097] Insulate the prepared oil-in-water emulsion in a water bath at 60°C, and react for 2 hou...

Embodiment 3

[0105] Embodiment 3.100g / L pendimethalin microcapsule suspension

[0106] According to the dosage in Table 5, heat pendimethalin (active ingredient 100g) to molten state, add 30g diphenylmethane diisocyanate (capsule wall material monomer), stir well and then add 50g AEO-9 ( emulsifier), the three are mixed evenly to prepare an oil phase;

[0107] Add 30g diethylaminopropylamine (capsule wall material monomer), 80g glycerol (antifreeze), 25g Dispersogen LFS (dispersant) and 8g organosilicon defoamer (defoamer) successively in deionized water, stir Uniformly prepared into an aqueous phase;

[0108] The oil phase and the water phase were kept warm in a constant temperature water bath at 60°C, and after mixing the oil phase and the water phase, they were sheared and emulsified at 8000rpm for 2min (D 50 controlled at 5 μm to 7 μm), to prepare an oil-in-water emulsion;

[0109] Insulate the prepared oil-in-water emulsion in a water bath at 60°C, and react for 2 hours under the s...

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Abstract

The invention relates to a pendimethalin micro-capsule suspending agent and a preparation method thereof. The pendimethalin is taken as the micro-capsule core of the pendimethalin micro-capsule suspending agent and the content thereof is 10-450g / L; polyuria or polyurethane is taken as a micro-capsule wall of the pendimethalin micro-capsule suspending agent and the content thereof is 20-100g / L; the pendimethalin micro-capsule suspending agent also contains 20-100g / L emulsifier, 20-60g / L dispersing agent, 30-100g / L antifreezing agent, 1-10g / L viscosity modifier and 2-15g / L antifoaming agents and the balance of water. The pendimethalin micro-capsule suspending agent can solve the problem that the liquid preparation is easy to color and pollute the drug applying equipment; the agent does not contain the solvent and is environment-friendly; the compound of dispersing agent and emulsifier adopted by the invention can solve the problem of system creaming caused by coarse crystal easily generated by the low melting point compound following the temperature fluctuation; according to the preparation method provided by the invention, the temperature control is adopted, the operation is performed under normal pressure, no catalyst is used, the process is simple, no special equipment is required and the cost is low.

Description

technical field [0001] The invention relates to the field of pesticide preparations, in particular to a pendimethalin microcapsule suspension and a preparation method thereof. Background technique [0002] Pendimethalin belongs to dinitroaniline herbicides. The pure product is orange-yellow crystalline solid with a melting point of 54-58°C. It is widely used in cotton, corn, rice, potato, soybean, peanut, Selective soil sealing herbicide for tobacco and vegetable fields. Pendimethalin is a selective systemic herbicide with poor conductivity. It does not affect the germination of weed seeds, but works after the young shoots, stems and roots absorb the agent during the germination process of weed seeds. Pendimethalin has a wide application range, good drug effect, and is not easy to cause drug injury. Suitable for soybean, corn, peanut, pea, cotton, celery, tobacco, sunflower, rice, various vegetables and orchards to control barnyardgrass, crabgrass, foxtail, lily, amaranth...

Claims

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Application Information

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IPC IPC(8): A01N33/18A01N25/28A01P13/00
CPCA01N25/28A01N33/18A01N2300/00
Inventor 杜凤沛李向东
Owner CHINA AGRI UNIV
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