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Preparation method of dry pesticide suspension agents

A technology of dry suspension concentrate and pesticide, which is applied in the field of preparation of pesticide dry suspension concentrate, which can solve the problems of reducing suspension slurry, high price, and difficulty, and achieve the effects of increasing solid content, reducing energy consumption, and saving energy

Inactive Publication Date: 2019-05-10
SHENZHEN NOPOSION AGROCHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of solid content will also increase the viscosity of suspension slurry, which will cause troubles to the crushing and transportation of materials. It is ideal to obtain high solid content and lower viscosity suspension agent slurry
However, some low-melting point, high water-soluble original drugs are difficult to prepare high-content suspending agents, and sometimes the solid content of the suspension slurry has to be reduced to ensure fluidity
Moreover, some pesticide technical materials are completely incompatible with lignin dispersants. Adding lignin dispersants not only cannot solve the dispersion problem, but also cannot obtain high-solid-content suspension agent slurry. Only expensive high-temperature-resistant polymers can be used. Dispersant, which increases the difficulty of preparation and processing cost

Method used

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  • Preparation method of dry pesticide suspension agents

Examples

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Effect test

Embodiment 1

[0027] Embodiment one: the preparation of 50% pymetrozine dry suspension

[0028] Formulation composition: Pymetrozine technical 50%; wetting agent (sodium lauryl sulfate) 2%; high-performance dispersant (sodium salt of alkylnaphthalenesulfonic acid formaldehyde condensate) 3%; high temperature resistant dispersant (Ultrazine NA type sodium lignosulfonate) 25%; defoamer (20% polydimethylsiloxane emulsion) 0.5%; disintegrant (potassium sulfate) 10%; filler (kaolin) to make up 100%.

[0029] The preparation method is as follows: Weigh 2Kg of wetting agent, 3Kg of high-performance dispersant, and 0.5Kg of defoamer into a stirring container containing 150 kg of water, stir and dissolve; then 50Kg of pymetrozine, 9.5 kg of filler Kaolin) is added into the stirring container batch by batch, and stirred to form a uniform slurry, which is passed into three series-connected sand mills, and sand-milled to obtain a suspending agent. Take the above-prepared pymetrozine suspension concent...

Embodiment 2

[0030] Embodiment two: the preparation of 70% pymetrozine dry suspension

[0031] Formulation composition: Pymetrozine original drug 70%; wetting agent (sodium lauryl sulfate) 2%; high-performance dispersant (sodium alkylnaphthalene sulfonate formaldehyde condensate) 5%; high temperature resistant dispersant (Ultrazine NA Model sodium lignosulfonate) 20%; defoamer (20% polydimethylsiloxane emulsion) 0.5%; disintegrant (potassium sulfate) 2.5%.

[0032] The preparation method is as follows: Weigh 2Kg of wetting agent, 5Kg of high-performance dispersant, and 0.5Kg of defoamer into a stirring container filled with 150 kg of water and stir to dissolve; then add 70Kg of pymetrozine into the stirring container batch by batch , stirred into a uniform slurry, the slurry was passed into three sand mills connected in series, and sand milled to obtain a suspending agent. Take the above-prepared pymetrozine suspension concentrate, add 20Kg high-temperature-resistant dispersant and 2.5Kg ...

Embodiment 3

[0033] Example 3: Preparation of 55% pymetrozine spirotetramat dry suspension

[0034] Formula composition: Pymetrozine technical 40%; spirotetramat technical 15%; wetting agent (sulfosuccinate sodium salt) 2%; high-performance dispersant (dialkyl succinic acid sulfonates) 3%; high temperature resistant dispersant (Ultrazine NA type sodium lignosulfonate) 25%; defoamer (20% polydimethylsiloxane emulsion) 0.5%; disintegrant (potassium sulfate) 10%; filler ( Kaolin) make up 100%.

[0035] The preparation method is: weigh 2Kg of wetting agent, 3Kg of high-performance dispersant, and 0.5Kg of defoamer, add them into a stirring container with 150 kg of water, and stir to dissolve; Add 4.5 kg of filler (kaolin) to the stirring vessel batch by batch, stir to form a uniform slurry, pass the slurry into three sand mills connected in series, and grind to obtain a suspending agent. Take the suspending agent prepared above, add 25Kg of high temperature resistant dispersant and 10Kg of w...

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Abstract

The invention belongs to the field of pesticide preparations, and discloses a preparation method of dry pesticide suspension agents. The method includes the steps: firstly, selecting high-performancedispersing agents to prepare high-content pesticide suspension agents; secondly, adding water-soluble high-temperature-resistant dispersing agents and water-soluble disintegrating agents into a suspension system and performing shear mixing; thirdly, performing spray drying to obtain dry suspension agent products. The method is mainly applicable to preparation of high-content suspension agent high-difficulty original medicine systems such as low-melting-point original medicines with the melting point lower than 80 DEG C, high-water-solubility original medicines with water solubility higher than0.5g / L and original medicines easily forming hydrogen bonds and water clusters with water. The preparation method is used for preparing the dry suspension agents, the solid content ratio of preparedsuspension slurry can be increased, spray drying energy consumption is reduced, and the granulating speed and the particle size of the dry suspension agents are increased.

Description

technical field [0001] The invention belongs to the field of pesticide preparations, and in particular relates to a method for preparing a pesticide dry suspension. Background technique [0002] The pesticide dry suspension concentrate needs to be prepared into a suspension slurry by wet grinding first, and then spray-dried to obtain the product. Pesticides are heat-sensitive products. In order to prevent the agglomeration of active ingredients after high-temperature granulation, it is necessary to select a heat-resistant dispersant to wrap the original drug particles before spray drying to ensure that the product can be normally dispersed after being heated. The lignin-based dispersant has excellent heat resistance and has a large amount of negative charge, which surrounds the surface of the original drug particles, which can ensure that the active ingredients do not agglomerate during the drying process and ensure product quality. Therefore, sodium lignosulfonate dispersa...

Claims

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Application Information

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IPC IPC(8): A01N25/14A01N43/707A01N47/06A01N51/00A01N47/24A01N43/40A01P7/04
CPCA01N25/14A01N43/40A01N43/707A01N47/06A01N47/24A01N51/00
Inventor 廖科超黄柯程骆风华李鹏飞李谱超
Owner SHENZHEN NOPOSION AGROCHEM
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