Sulphonate Gemini surfactant and preparation method thereof
A surfactant, gemini surface technology, applied in chemical instruments and methods, dissolution, chemical/physical processes, etc., can solve the problem of limited types of gemini surfactants, not many, etc., to achieve good slime peeling characteristics, easy to operate , excellent surface activity
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[0030] Example 1
[0031] The present invention is further illustrated below through the synthesis example of EM-12
[0032] 1. Maleic anhydride ring-opening reaction
[0033] Under the condition of room temperature, the air in the dry 250mL three-necked flask equipped with the stirrer, thermometer and reflux condenser was exhausted with argon, 5mL of solvent acetone was added, 37.5g of maleic anhydride was added first, and then 15.6g of ethylenediamine was added dropwise. mL, the molar ratio of the dosage is 2.5:1, and then the catalyst BF is added dropwise 3 - 2 mL of ether solution (w=47%), heated and stirred to reflux under argon protection, reacted for 18 h, the crude product was washed 3-5 times with acetone, filtered with suction, and dried under vacuum at 60 °C to obtain a pale yellow intermediate I II Ethylamine bis(acyl-acrylic acid) powder 35.9g, yield 87.75%;
[0034] 2. Addition reaction
[0035] In a dry three-necked flask equipped with a stirrer, a thermomet...
Example Embodiment
[0038] Example 2
[0039] Surface Activity Determination of EM Series Surfactants
[0040] The surface tension of the product solution at different concentrations was measured by the ring method, and the surface tension variation curve of the EM-12 aqueous solution with the concentration was obtained, see Figure 4 . The critical micelle concentration value (cmc) and the surface tension at the critical micelle concentration (γ) are obtained from the curve turning points in the figure. cmc ). Experiments found that the critical micelle concentration and the surface tension at the critical micelle concentration of the EM series of surfactants are low. For example, the critical micelle concentration of EM-12 is 0.42 mmol / L, and the surface tension at the critical micelle concentration is 28.8 mN / m.
Example Embodiment
[0041] Example 3
[0042] Infrared Spectra of Intermediate and Target Products EM Series Surfactants
[0043] The infrared spectrum of the intermediate obtained by Example 1, see figure 1 , 2 ; For the infrared spectrum of EM-12 surfactant, see image 3 , which is obtained from spectral analysis:
[0044] figure 1 , Intermediate I: 3294.26cm -1 is the stretching vibration peak of N-H; 3065.47cm -1 is the stretching vibration peak of C-H; 2850.21cm -1 for -ch 2 Antisymmetric and symmetric stretching vibration peaks of -; 1697.21cm-1 is the -C=O stretching vibration peak in α, β unsaturated acids; 1629.68cm-1 is -N-C=O stretching vibration peak; 1582.36cm -1 is the bending vibration peak of secondary amine; 715.19cm -1 for -ch 2 stretching vibration peak.
[0045] figure 2 , Intermediate II: 3466.93cm -1 are the stretching vibration peaks of N-H; 2919.07 and 2851.07 cm -1 for -ch 2 The antisymmetric and symmetric stretching vibration peaks; 1706.35cm -1 It is th...
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