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A kind of dimeric surfactant containing azophenyl group and its application

A surfactant, azophenyl technology, applied in the field of dimeric surfactants, can solve the problems of stability change, foam instability, etc., achieve high viscosity, low critical foam concentration, and avoid the effect of synthesis reaction

Active Publication Date: 2020-11-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported surfactants containing azophenyl groups are extremely unstable after being exposed to ultraviolet light, and the stability will change significantly, so they are often used as defoamers

Method used

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  • A kind of dimeric surfactant containing azophenyl group and its application
  • A kind of dimeric surfactant containing azophenyl group and its application
  • A kind of dimeric surfactant containing azophenyl group and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: Dipolymer quaternary ammonium salt surfactant synthetic route

[0040] Electrostatically constructed dimeric surfactants, the structural formula is as follows:

[0041]

[0042] The synthetic route of dimer quaternary ammonium salt is as follows:

[0043]

[0044] The preparation method of the dimeric surfactant of electrostatic construction is 1,1'-(diazene-1,2-diylbis(4,1-phenylene))bis(N,N,N-trimethyl methyl ammonium) mixed with sodium oleate in a molar ratio of 1:2 to generate the final dimeric surfactant with azophenyl groups.

Embodiment 2

[0045] Example 2: Synthesis of 1,1'-(diazene-1,2-diylbis(4,1-phenylene))bis(N,N,N-trimethylmethylammonium)

[0046] In a 250ml round bottom flask, add 6.86g (0.050mol) of p-nitrotoluene, 110ml of methanol, 1.5g (0.063mol) of magnesium chips and a small grain of iodine. Keep reflux. When the magnesium scrap basically reacts, cool down, add 1.5g (0.063mol) magnesium scrap, and then reflux on a hot water bath at 70-80°C until the magnesium scrap basically disappears. Cool, pour the mixture into a beaker containing 200ml of water, slowly add glacial acetic acid to weak acidity under stirring, and precipitate a light yellow solid, filter under reduced pressure, wash the filter cake with water, recrystallize from absolute ethanol three times, and obtain crystals in the first two times. The type did not meet the requirements, and a golden yellow solid was obtained after three times. In a 250ml beaker, add 2.8g (0.013mol) 4,4'-dimethylazobenzene, 5.2g (0.029mol) NBS, benzoyl peroxid...

Embodiment 3

[0047] Embodiment 3: Construction of dimeric surfactant

[0048] 1,1'-(diazene-1,2-diylbis(4,1-phenylene))bis(N,N,N-trimethylmethylammonium) (0.327g, 4×10 -4 mol), sodium oleate (0.243g, 8×10 -4 mol), ultrapure water (19.43g, 1.08mol) were added to a 20ml glass bottle. It was then stirred well to obtain a clear solution (20 mmol / L) of dimeric surfactant.

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Abstract

The invention discloses a dimeric surfactant containing an azobenzene group, and an application thereof, and belongs to the fields of surfactant science and application technologies thereof. Sodium oleate and a dimeric quaternary ammonium salt are compounded to obtain the electrostatically constructed dimeric surfactant, and the above amphiphilic compound molecularly structurally facilitates foamformation, so the surfactant can foam at a low dosage; and the surfactant solution can form a stable foam response performance system, and the foam stability keeps unchanged when the solution is irradiated with ultraviolet lights, so the influences of the azobenzene structure on the defoaming effect under ultraviolet irradiation are eliminated. The surfactant of the invention plays an active rolein promoting the basic research of the photoresponse of azobenzene derivatives, and can be widely applied to many fields of cosmetics, mineral flotation agents, textile fiber softeners, antistatic agents and pigment dispersants.

Description

technical field [0001] The invention relates to a dimeric surfactant containing an azophenyl group and its application, and belongs to the technical field of surfactant science and application. Background technique [0002] Surfactants are a class of substances that can significantly reduce the surface tension of a solution and form ordered molecular aggregates in the bulk phase when added in a very small amount, consisting of hydrophobic groups and hydrophilic groups. Due to its amphiphilic properties, surfactants can not only be adsorbed on the interface, but also form foam emulsions in a solution of a certain concentration, so they have properties such as foam flotation, ion flotation, foam flooding, and foam fire extinguishing. Surfactants can self-organize in solution to form various ordered molecular aggregates, such as spherical foams, rod-shaped foams, foams, vesicles, and liquid crystals. Surfactant foam, formation conditions and related mechanisms have always been...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C245/08C07C57/12C07C51/41A61K8/41A61Q19/00D06M13/463B03D1/01B03D101/04
Inventor 裴晓梅李朝旺宋冰蕾崔正刚
Owner JIANGNAN UNIV