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Viscoelastic system formed by functional Gemini surface active agent

A surfactant and solution technology, applied in the field of viscoelastic systems, can solve the problems of insufficient viscoelasticity, poor stability, and easy turbidity of worm-like micelles

Inactive Publication Date: 2016-10-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conditions for forming worm-like micelles are usually very harsh, and surfactants with special structures are generally required. Gemini surfactants can form worm-like micelles by taking advantage of their own structure and supplementing with special groups. However, usually, The viscoelasticity of the formed worm-like micelles is not high enough or the stability is not good, such as easy turbidity, etc.

Method used

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  • Viscoelastic system formed by functional Gemini surface active agent
  • Viscoelastic system formed by functional Gemini surface active agent
  • Viscoelastic system formed by functional Gemini surface active agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of embodiment 1:12-3 (OH)-12

[0027] Add 1,3-dibromo-2-propanol (10.0g, 0.046mol), N,N-dimethyldodecylamine (21.6g, 0.102mol) and 100mL of absolute ethanol to the reaction equipped with a reflux condenser In a container, heat to reflux and stir for 48 hours. After the reaction, the ethanol is removed by rotary evaporation to obtain a yellow viscous liquid. Four equal parts of the obtained crude product are transferred to four 50mL centrifuge tubes, and 30mL anhydrous ether is added to wash three times, centrifuged, poured Remove the supernatant. Then recrystallize five times in the centrifuge tube with ethanol / ether, put the centrifuge tube into a vacuum drying oven and dry for 48 hours to obtain 10.8 g of white solid product with a yield of 65%.

Embodiment 2

[0029] Preparation of Viscoelastic Surfactant Solutions. Prepare 80mmol / L of Gemini cationic surfactant solution and 100mmol / L of salt solution, wherein each surfactant solution takes 1.25mL, and then add appropriate amount of sodium o-hydroxybenzoate, sodium m-hydroxybenzoate and sodium p-hydroxybenzoate salt solution, so that the molar ratio of salt to Gemini cationic surfactant reaches 2:25, 4:25, 5:25, 6:25, 7:25, 8:25, 9:25, 10:25, and then Add ultrapure water so that the total volume of the mixed solution is 2 mL, and after mixing evenly, a series of viscoelastic surfactant solutions are obtained.

Embodiment 3

[0031] The viscoelasticity measurement of the viscoelastic surfactant solution obtained by compounding salt and cationic surfactant solution in Example 2.

[0032] The resulting viscoelastic surfactant solution was left to stand at 25°C for 48 hours, and the rheological properties were tested at 25°C. Before the dynamic scanning, the stress scanning is carried out to determine the linear viscoelastic region of the test sample, and the tests of the samples are all carried out in the linear viscoelastic region. For specific data, see figure 1 , figure 2 with image 3 :

[0033] figure 1 It is a dynamic shear diagram of sodium o-hydroxybenzoate / 50mM 12-3(OH)-12. It can be seen that in the frequency range tested, the elastic modulus of the sample is always greater than the viscous modulus, indicating that the sample has good elasticity .

[0034] figure 2 is the steady-state shear diagram of the sample. With the increase of salt concentration, the zero-shear viscosity of ...

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Abstract

The invention discloses a viscoelastic system formed by a functional Gemini surface active agent and belongs to the technical field of a surface active agent. According to a preparation method of a viscoelastic surface active agent solution provided by the invention, organic salt comprises sodium o-hydroxybenzoate, 3-hydroxy-benzoic aci monosodium salt and sodium p-Hydroxybenzoate; Gemini surface active agent with hydroxyl group is taken as the main component and is compounded with few organic salts, and then the viscoelastic surface active agent solution is obtained; the preparation of the viscoelastic surface active agent solution comprises the two processes of compounding and testing viscoelastic property; Gemini cationic surface active agent is prepared into the solution in certain concentration and then is compounded with the salt at different ratio, thus, the viscoelastic surface active agent solution is acquired.

Description

technical field [0001] The invention relates to a viscoelastic system constructed by a functionalized Gemini surfactant, belonging to the technical field of surfactants. Background technique [0002] Gemini surfactants, also known as gemini surfactants, twinned surfactants, twin surfactants or coupled surfactants, are two traditional surfactant molecules that are connected at or near their hydrophilic head groups through a linking group. A new type of surfactant formed by linking hydrophilic head groups together. Due to the particularity of its structure, gemini surfactants exhibit many unique properties that conventional surfactants do not possess, so they have strong application potential. Gemini surfactant has good solubilization, wetting, foaming and saponification and dispersing capabilities, and can be widely used in various fields such as daily chemical industry, food industry and tertiary oil recovery. In addition, in some special fields , For example, it can be us...

Claims

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Application Information

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IPC IPC(8): B01F17/18C09K23/18
CPCC09K23/017
Inventor 裴晓梅张群李文楷宋冰蕾崔正刚
Owner JIANGNAN UNIV
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