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A kind of water-soluble granule containing paraquat and its preparation method

A water-soluble granule, paraquat technology, applied in the field of pesticides, can solve the problems of poor efficacy and quality stability, flying dichloride powder dust, increasing the risk of dust pollution, etc. The effect of simple granular method and high value of large-scale application

Active Publication Date: 2016-08-03
SHANDONG WEIFANG RAINBOW CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this patent are: the drying process increases the risk of dust pollution, and the energy consumption is extremely high
This patent also has the problems of poor drug efficacy and quality stability, not easy to dump, inconvenient use by farmers, and easy residue
[0011] The improvement of these patents mainly tends to overcome the problems of paraquat, which is easy to be taken by mistake and low safety, and does not involve other aspects
In these patents, the raw materials of paraquat used include dichloride salt solid powder, mother liquor, and synthetic liquid. Among them, the dichloride salt powder is easy to form dust, which poses a great safety hazard to production personnel. Mother liquor and synthetic liquid Contains a large amount of water. If it is used directly without treatment, some dosage forms cannot be formed. If it is concentrated, it is easy to solidify into a solid, which is not conducive to subsequent production.

Method used

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  • A kind of water-soluble granule containing paraquat and its preparation method
  • A kind of water-soluble granule containing paraquat and its preparation method
  • A kind of water-soluble granule containing paraquat and its preparation method

Examples

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Effect test

preparation example Construction

[0045] The preparation method of water-soluble granule is:

[0046] (1) Take the mother liquor of paraquat, add the mother liquor of paraquat to the vacuum distillation equipment, and distill it under the pressure of -0.08--0.095MPa until the water content is 27-33wt%, to obtain the concentrate of the mother liquor of paraquat;

[0047] (2) Immediately transfer the obtained concentrate to a closed device after concentration, first add adsorbent and mix thoroughly, then add surfactant and binder and mix to obtain a raw material mixture. Finally, the mixture is granulated by a twin-screw pre-extrusion granulation method, and the granulated granules are dried to obtain paraquat water-soluble granules.

Embodiment 1

[0049] The formula of water-soluble granules is: paraquat dichloride 83% (60% based on cations), adsorbent sucrose 6.4%, adsorbent sodium edetate 1.6%, surfactant tallow amine polyoxyethylene ether 5 %, binder polyvinylpyrrolidone 4%.

[0050] The preparation method is:

[0051] (1) Take 1000g of the paraquat mother liquor, add the paraquat mother liquor into the vacuum distillation equipment, and distill under the pressure of -0.085MPa until the water content is 30%, to obtain 600g of the concentrated solution of the paraquat mother liquor;

[0052] (2) Immediately transfer all the concentrate to a closed device after concentration, first add adsorbent and mix thoroughly for 0.5h according to the proportion, then add surfactant and binder and mix for 0.5h to obtain a raw material mixture. Finally, the mixture was granulated by a twin-screw pre-extrusion granulation method at a granulation temperature of 45° C., and the granulated granules were dried at 75° C. to obtain paraq...

Embodiment 2

[0055] The water-soluble granule formulation is the same as in Example 1.

[0056] The preparation method is:

[0057] (1) Take the mother liquor of paraquat, add the mother liquor of paraquat to the vacuum distillation equipment, distill under the pressure of -0.08MPa until the water content is 33%, and obtain the concentrated solution of the mother liquor of paraquat. The obtained concentrated liquid has no crystallization and concentration phenomenon, and can be easily removed from the vacuum distillation equipment. After the transfer, the inner wall of the vacuum distillation equipment has only a small amount of sticky wall phenomenon, and there is no residue at the bottom of the equipment.

[0058] (2) Immediately transfer all the concentrated liquid to the closed equipment after concentration, first add the adsorbent and mix thoroughly for 0.5h according to the proportion, then add the surfactant and binder and mix for 0.5h, and finally use the twin-screw pre-extrusion g...

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Abstract

The invention discloses paraquat-containing water soluble granules. The water soluble granules take paraquat as effective component, wherein the raw material of the paraquat is selected from concentrated solution of paraquat mother liquor, the concentrated solution is obtained by distilling and dewatering the paraquat mother liquor under the pressure of -0.08 to -0.095MPa, and the water content of the concentrated solution is 27-33wt%. The invention also provides a preparation method of the paraquat-containing water soluble granules. The whole preparation technology is simple and feasible, free from emission of the three wastes, high in productivity and good in environmental protection property; the paraquat mother liquor is taken as the raw material, and is free from the phenomena of crystallization and solidification and is hardly stuck on the wall when being concentrated by accurately controlling the concentration conditions and the water content; the obtained concentrated solution is easy to transfer, basically free from residue and free from resource waste, and a concentration device is not damaged, so that the paraquat-containing water soluble granules have good application prospect.

Description

technical field [0001] The invention relates to a paraquat-containing preparation and a preparation method thereof, in particular to a paraquat-containing water-soluble granule which uses paraquat mother liquor or a concentrate of the mother liquor as a raw material of paraquat and a preparation method thereof, belonging to the pesticide technology field. Background technique [0002] Paraquat, whose chemical name is 1-1-dimethyl-4-4-bipyridine cationic salt, is a fast-killing quaternary ammonium salt herbicide, which has contact killing effect and certain systemic effect, and can be quickly greened by plants. Tissue absorption, causing it to die, has no effect on non-green tissue. However, paraquat has no conduction effect, and can only damage the drug site, cannot penetrate the corked bark, cannot damage the roots of the plant and the seeds hidden in the soil, and can quickly combine with the soil in the soil to passivate it. Plant roots, perennial underground stems and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N43/40A01N25/14A01P13/00
Inventor 孙国庆侯永生吴勇陈帅高技峰
Owner SHANDONG WEIFANG RAINBOW CHEM