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Quaternary ammonium salt glycyrrhetinic acid cationic surfactant and its preparation method and application

A technology of surfactant and glycyrrhetinic acid, applied in the field of quaternary ammonium salt glycyrrhetinic acid cationic surfactant and its preparation, to achieve good inhibitory effect, convenient operation and good surface activity

Active Publication Date: 2020-10-20
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current research focuses on the regulation of the single physicochemical properties of the liquid, and few studies increase the wetting behavior of droplets on hydrophobic plant leaves through coordinated regulation. Therefore, if a new type of surfactant can be developed, While reducing the surface tension of the liquid, it can also control the rheology, viscosity and other properties of the liquid, which will be of great significance for suppressing the bouncing behavior of liquid droplets on the solid surface.

Method used

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  • Quaternary ammonium salt glycyrrhetinic acid cationic surfactant and its preparation method and application
  • Quaternary ammonium salt glycyrrhetinic acid cationic surfactant and its preparation method and application
  • Quaternary ammonium salt glycyrrhetinic acid cationic surfactant and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1: the synthesis of quaternary ammonium salt glycyrrhetinic acid cationic surfactant

[0042] The synthetic route of quaternary ammonium salt glycyrrhetinic acid cationic surfactant is as follows:

[0043]

[0044] (1) Synthesis of glycyrrhetinic acid methyl ester: Dissolve glycyrrhetinic acid GA (5.09g, 10.80mmol) in 40mL DMF, add anhydrous potassium carbonate (2.98g, 21.60mmol) and stir, slowly add iodomethane (1.35 mL, 21.65mmol), reacted at room temperature for 10h, stopped stirring to obtain a reaction solution, poured the reaction solution into 500mL water, left to stand to precipitate a large number of flocs, obtained a white solid by suction filtration, and dried with an infrared lamp. The crude product was separated by column chromatography (eluent: petroleum ether / ethyl acetate=15:1, v / v) to obtain 4.90 g of white solid GA-1 with a yield of 94%.

[0045] (2) Synthesis of 3-bromoacetyl-glycyrrhetinic acid methyl ester: GA-1 (2.00g, 4.12mmol) and an...

Embodiment 2

[0050] Embodiment 2: the mensuration of surface tension of quaternary ammonium salt glycyrrhetinic acid cationic surfactant

[0051] Prepare a series of surfactant aqueous solutions with different concentrations (1×10 -7 mol / L, 5×10 -7 mol / L, 1×10 - 6 mol / L, 5×10 -6 mol / L, 1×10 -5 mol / L, 5×10 -5 mol / L, 1×10 -4 mol / L, 5×10 -4 mol / L, 1×10 - 3 mol / L), using the hanging plate method to measure its surface tension at 25°C, each sample was repeatedly measured five times, and the surface tension of the solution was plotted as a function of concentration.

[0052] From Figure 4 The surface tension γ of the medium quaternary ammonium salt glycyrrhetinic acid cationic surfactant varies with the concentration C. It can be seen that the compound has good surface activity. As the concentration increases, the surface tension of the solution decreases from 72mN / m to 47mN / m, the critical micelle concentration is 5×10 -4 mol / L.

Embodiment 3

[0053] Example 3: Research on the regulation and control of the bouncing behavior of droplets on the PTFE hydrophobic membrane by the quaternary ammonium salt glycyrrhetinic acid cationic surfactant. The material used in the experiment is PTFE, the camera is a Nikon camera, and the droplets are regulated and extruded by the Flow EZ precision pressure controller to ensure that the size of each droplet is the same. After the droplet is extruded by the needle tube, a high-speed camera is used to record the spreading, retraction and bouncing of the droplet on the surface of the PTFE hydrophobic membrane.

[0054] Figure 5 A concentration of 1 x 10 was recorded -3 Mole / L of quaternary ammonium glycyrrhetinic acid cationic surfactant dropped on PTFE membrane at different heights to obtain the contact, spreading, retraction, bounce and final state moments. As the temperature rises continuously, the spreading area of ​​the droplet on the PTFE membrane gradually increases. For the ...

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Abstract

The invention discloses a quaternary ammonium salt glycyrrhetinic acid cationic surfactant, a preparation method and applications thereof. According to the invention, the critical micelle concentration of the surfactant at room temperature is 5*10<-4> mol / L, so that the surface tension can be reduced from 72 mN / m to 47 mN / m; the surfactant has a good regulation and control effect on the bouncing behavior of liquid drops on the hydrophobic solid surface, wherein when the concentration of the surfactant is higher than 5*10<-4> mol / L on the surfaces of leaves such as a hydrophobic PTFE film, setaria viridis, sonchus brachyotus and the like, the bouncing of liquid drops can be obviously inhibited, and good spreading is achieved; and the regulation and control of the quaternary ammonium salt glycyrrhetinic acid cationic surfactant on the liquid drop bouncing behavior can be extended to various crop leaves such as wheat, rice, corn, cabbage and the like, and the quaternary ammonium salt glycyrrhetinic acid cationic surfactant has good universality and has large application prospect in the field of agriculture.

Description

technical field [0001] The invention relates to the technical field of regulating the bouncing behavior of liquid droplets on a solid surface, in particular to a quaternary ammonium salt glycyrrhetinic acid cationic surfactant and a preparation method and application thereof. Background technique [0002] The wetting and spreading of liquid droplets on solid surfaces is of great significance to many industrial and agricultural processes. In the process of pesticide spraying, increasing the wetting and adhesion of the chemical solution on the plant leaves is conducive to promoting the absorption of pesticides and reducing the residues in the environment. However, the surface of most plant leaves contains a hydrophobic waxy layer, which is not easily wetted by water, resulting in more than 50% of the medicinal liquid flowing into the environment through bouncing, rolling and merging, which poses a huge threat to the ecological environment. Therefore, how to realize the effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/30C07J63/00
CPCA01N25/30C07J63/008
Inventor 高玉霞杜凤沛刘洋马悦赵克非李子璐
Owner CHINA AGRI UNIV
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