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Low-melting-point compound suspending agent and preparation method thereof

A compound and low melting point technology, applied in botany equipment and methods, animal repellants, plant growth regulators, etc., can solve the problems of easy melting or softening, low melting point, deterioration of physical properties, etc., and achieve physical stability Qualified, good fluidity, good physical stability

Active Publication Date: 2013-02-13
SINO AGRI LEADING BIOSCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also some compounds with a melting point of around 60°C, such as the melting point of pendimethalin at 54°C to 58°C, beta-cypermethrin at 64°C to 71°C, and myclobutanil at 63°C to 68°C. The melting point is low, and it is easy to deteriorate the physical properties in the thermal storage accelerated test, such as flocculation, creaming, or creaming and flocculation when it is transferred from the thermal storage state to normal temperature.
These active substances are processed into suspensions, which need to be ground to obtain a small particle size, but they are easily melted or softened during the crushing and sanding process, thus affecting the physical stability of the formulation
Due to the low melting point of this type of compound, if it is prepared as a suspension, it is prone to stratification and particle size increase during storage, and finally the entire system is destroyed and cannot be used.
Due to the technical difficulties mentioned above, the suspension concentrates of these low melting point compounds have not been applied in agriculture

Method used

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  • Low-melting-point compound suspending agent and preparation method thereof
  • Low-melting-point compound suspending agent and preparation method thereof
  • Low-melting-point compound suspending agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: prepare 1% beta-cypermethrin suspension concentrate

[0034] The mass percent of each component is as follows:

[0035]

[0036] Preparation:

[0037] Mix beta-cypermethrin and white carbon black evenly, add polyvinylpyrrolidone and mix evenly, then add appropriate amount of water, put the mixture in a stirring tank, add high molecular carboxylic acid polymer dispersant, wetting agent NP-7 , propylene glycol, and mix well. Then turn on the sand mill and perform sand grinding under the condition of ≤40° C. to obtain a sand grinding liquid with a particle size between 1 μm and 5 μm. Then add the pre-prepared xanthan gum liquid with a mass concentration of 4% and sodium benzoate into the sanding liquid, and stir evenly to obtain a 1% beta-cypermethrin suspending agent. Process flow chart see figure 1 .

Embodiment 2

[0038] Embodiment 2: prepare 10% beta-cypermethrin suspension concentrate

[0039] The weight percent of each component:

[0040]

[0041] Preparation:

[0042] Mix beta-cypermethrin and diatomaceous earth evenly, add polyvinylpyrrolidone and mix evenly, then add appropriate amount of water, put the mixture in a stirring tank, add naphthalenesulfonate dispersant, wetting agent NP-7, propylene glycol, mix uniform. Then turn on the sand mill and perform sand grinding under the condition of ≤40° C. to obtain a sand grinding liquid with a particle size between 1 μm and 5 μm. Then add the pre-prepared xanthan gum liquid with a mass concentration of 4% and sodium benzoate into the sanding liquid, and stir evenly to obtain a 30% beta-cypermethrin suspension concentrate. Process flow chart see figure 2 .

Embodiment 3

[0043] Embodiment 3: prepare 30% pendimethalin suspension

[0044] The weight percent of each component:

[0045]

[0046]

[0047] Preparation:

[0048]Pendimethalin original drug and diatomite are mixed evenly, then polyvinylpyrrolidone is added to mix evenly, then an appropriate amount of water is added, the mixture is placed in a stirring tank, and lignosulfonate dispersant and wetting agent lauryl sulfuric acid are added Sodium, propylene glycol, mix well. Then turn on the sand mill and perform sand grinding under the condition of ≤40° C. to obtain a sand grinding liquid with a particle size between 1 μm and 5 μm. Then add the pre-prepared xanthan gum liquid with a mass concentration of 4% and isothiazolinone into the sanding liquid, and stir evenly to obtain a 30% pendimethalin suspension. Process flow chart see image 3 .

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Abstract

The invention discloses a low-melting-point compound suspending agent and a preparation method thereof. The low-melting-point compound suspending agent is composed of the following substances by mass: 1%-50% of low-melting-point compound, 1%-10% of dispersing agent, 1%-6% of wetting agent, 5 %-30% of porous carrier, 1%-3% of polyvinylpyrrolidone, 0.1%-0.5% of thickener, 3%-5% of anti-freezing agent, 0.1%-0.5% of preservative and deionized water as the balance. The low-melting-point compound refers to the compound with the melting point as 50 DEG C- 70 DEG C. The suspending agent adopts a porous carrier to adsorb the low-melting-point compound, utilizes polyvinylpyrrolidone for wrapping, utilizes the proper dispersing agent and the proper wetting agent for assistance and improves physical stability. The agent is good in physical stability if stored under common condition and is still qualified, is not agglomerated and is good in mobility if stored under high temperature like 54 DEG C.

Description

technical field [0001] The invention relates to a low melting point compound suspending agent and a preparation method thereof. Background technique [0002] The suspension has good fluidity, dispersibility, spreadability and high biological activity; it does not use any organic solvents, does not generate dust, and is safe for operators, users and the environment; it is easy to dilute, mix and measure during application, Production costs are lower. In the past ten years, it has developed rapidly in our country and has become the most important processing dosage form except emulsifiable concentrate and wettable powder. Domestically processed emulsifiable concentrates contain a large amount of volatile and toxic benzene solvents, which are unsafe and harmful to humans and the natural environment. During the processing and manufacturing of wettable powder, the dust generated will also cause harm to producers and users; at the same time, it will pollute the environment, and s...

Claims

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Application Information

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IPC IPC(8): A01N25/04A01N33/18A01N53/08A01N43/653
Inventor 张小军康凯李彦飞
Owner SINO AGRI LEADING BIOSCI
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