Gemini surface active agent and preparation method thereof
A technology of gemini surface and active agent, applied in the field of gemini surfactant and its preparation, can solve the problems of late start and limited types of gemini surfactant, and achieve the effects of easy separation, easy control of reaction conditions and excellent surface activity
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Embodiment 1
[0032] This example is the specific synthesis method of product CM-12 of the present invention.
[0033] 1. Synthesis of fatty acid chlorides
[0034] Add 10.0g of fatty acid into a dry 250mL three-necked flask equipped with a stirrer, thermometer and reflux condenser, heat to 45°C, after the acid is completely dissolved, add 3d DMF, drop 25.0mL of thionyl chloride, and use lye for the tail gas Absorption, after the reaction is moderated, heat up to 65°C and stir for 2h, then heat up to 85°C and reflux for 2h, distill under reduced pressure, collect fractions of fatty acid chlorides under a vacuum of 0.09-0.095MPa, the product is a colorless transparent liquid, the yield 89.6%, respectively.
[0035] 2. Ring-opening reaction of maleic anhydride
[0036]Use argon to exhaust the air in a dry 250mL three-neck flask equipped with a stirrer, a thermometer, and a reflux condenser, first add 31.5g of maleic anhydride, add 150mL of solvent acetone, and then dropwise add ethylenediam...
Embodiment 2
[0042] This example is the surface activity determination method of CM series surfactants
[0043] Adopt drop volume method to measure the surface tension of product solution under different concentrations, make CM-12 aqueous solution surface tension change curve with concentration, see figure 1 . The critical micelle concentration value (cmc) and the surface tension (γ cmc ). Experiments have found that the critical micelle concentration and surface tension at the critical micelle concentration of CM series surfactants are low, such as the critical micelle concentration of CM-12 is 0.21mmol / L, and the surface tension at the critical micelle concentration is 32.5 mN / m.
Embodiment 3
[0045] This example is the infrared spectrum of the intermediate product and the target product CM series surfactants
[0046] The infrared spectrum of the intermediate that obtains by example 1 sees figure 1 , 2 ; Infrared spectrum of CM-12 surfactant see image 3 , from the spectrum analysis we know:
[0047] figure 2 , intermediate product I: 2926.10cm -1 , 2855.31cm -1 for -CH 3 ,-CH 2 The antisymmetric and symmetric stretching vibration peaks; 1801.13cm -1 It is the stretching vibration peak of acid chloride-C=O; 1466.44cm -1 for -CH 2 scissor bending vibration absorption peak; 722.12cm -1 It is the saturated -C-H in-plane rocking bending vibration peak; 680.34cm-1 is the vibration peak of -C-Cl.
[0048] image 3 , intermediate product II: 3294.62cm -1 It is the stretching vibration peak of N-H; 3065.47cm -1 It is the stretching vibration peak of C-H; 2850.21cm -1 for -CH 2 The symmetrical stretching vibration peak of -; 1697.21cm -1 -C=O stretching vib...
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