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High-effective lignosulfonate pesticide suspension dispersing agent and preparation and applications thereof

A technology of lignosulfonate and dispersant, applied in application, biocide, animal repellent, etc., can solve the problems of unclear process parameters, poor performance, high cost, and achieve favorable interaction and improve dispersion performance. , the effect of improving the dispersion performance

Inactive Publication Date: 2015-04-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 1209964C introduces the product of alkylene oxide unit into lignin as a pesticide suspension and dispersant, but the process is complicated, the cost is high, and the process parameters are not clear
Patent CN 101147480A prepares pesticide suspension and dispersant by sulfonating lignin with redox initiator, but the dispersion of the product is unstable, the performance after heat storage is not good, and the suspension rate is only about 90%
Patent CN 102786697A prepares high-molecular-weight medium-sulfonated lignin-based pesticide dispersant by formaldehyde polymerization, which is suitable for a variety of pesticide suspension systems, but still has the disadvantages of poor performance after thermal storage and a suspension rate lower than 90%.

Method used

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  • High-effective lignosulfonate pesticide suspension dispersing agent and preparation and applications thereof
  • High-effective lignosulfonate pesticide suspension dispersing agent and preparation and applications thereof
  • High-effective lignosulfonate pesticide suspension dispersing agent and preparation and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Dissolve 10g of alkali lignin in 20mL of water, add 2g of NaOH, adjust the pH to 12, and add 1g of 1,4-butyl sultone and 1g of 1,6-dibromohexane at the same time. The reaction was conducted under heating at ℃ for 8 hours; after the reaction, it was cooled to room temperature, and the lignosulfonate product (lignosulfonate high-efficiency pesticide suspension dispersant) was obtained after purification.

[0042] In the experiment, the instrument AutosystemXL / I-series / Spectrum2000 infrared spectrometer was used, and the potassium bromide tablet method was used to perform infrared characterization of the alkali lignin and the product of this example. Such as figure 1 As shown, 2935cm -1 There is a methylene stretching vibration peak, which is obviously enhanced; 1160cm -1 Where is the stretching vibration peak of the ether bond, the absorption strength of the product of Example 1 has been significantly improved, and the absorption peak of the sulfonate group is 1217 cm -1...

Embodiment 2

[0048] Dissolve 10g alkali lignin in 30mL ethanol, add 1.5g KOH, adjust the pH to 12, and add 1.5g 1,3-propyl sultone and 2g 1,5-dibromopentane dropwise at normal pressure. , Reaction at room temperature for 8h; after the reaction, the lignosulfonate product is obtained after purification.

Embodiment 3

[0050] Dissolve 10g alkali lignin in 30mL methanol and add 2g Na 2 CO 3 , Adjust the pH to 14, and at the same time add dropwise 2g 1,4-butane sultone and 2g 1,10-dibromodecane, and react for 8h under normal pressure and heating at 80℃; after the reaction, cool to room temperature, After purification, lignosulfonate products are obtained.

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Abstract

The invention discloses a high-effective lignosulfonate pesticide suspension dispersing agent and preparation and applications thereof. The preparation method comprises the following steps: dissolving industrial lignin or lignosulfonate into water, or into a mixed solution of an organic solvent and water, adding base substances so as to enable the pH of the system to be 9-14, and dropwise adding alkyl sulfonic acid sulfonating agent and dihalogenated alkane monomer; performing bridging polymerization and sulfonation reaction simultaneously under conditions of normal pressure and room temperature of approximately 100 DEG C, to obtain the novel high-effective lignosulfonate pesticide suspension dispersing agent. According to the high-effective lignosulfonate pesticide suspension dispersing agent and preparation and applications thereof, the raw materials are low in cost and rich in sources; high-effective lignosulfonate pesticide suspension dispersing agent contains both alkyl chain group and long alkyl chain sulfonic acid groups, so that the water solubility is good, the dispersion property is excellent, low doping amount can show suspension rate up to 99.86% when the high-effective lignosulfonate pesticide suspension dispersing agent is used in nitrogen-containing pesticide suspending agents such as carbendazim and Acetamiprid, the pesticide particle size is less than 2mum, and the dispersity of the nitrogen-containing pesticide in water can be greatly improved.

Description

Technical field [0001] The invention relates to the preparation and application of a modified lignosulfonate, especially a novel lignosulfonate high-efficiency pesticide suspension dispersant. Background technique [0002] Pesticides, as an important means of preventing pests and weeds and protecting crops, are currently developing towards new formulations with low toxicity, good environmental compatibility, high efficiency, long lasting effect, and convenient use. Due to its advantages such as no dust hazard, water as a dispersant to reduce the use of organic solvents, large active surface, strong penetrating power, and high efficacy, it shows great potential and broad prospects. However, pesticides are mainly hydrophobic structures, which are easy to agglomerate in water and have poor dispersion properties, which affect their efficacy. High-efficiency dispersants must be added to prevent the pesticide particles in the system from agglomerating and keep them stable and uniform. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/30A01N25/04C08H7/00
Inventor 邱学青李远曾伟媚杨东杰周明松庞煜霞
Owner SOUTH CHINA UNIV OF TECH
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