Temperature-resistant and salt-resistant viscoelastic surfactant, and preparation method and application thereof
A surfactant, temperature and salt resistance technology, applied in the field of surfactants and their preparation, can solve the problems of poor temperature resistance, insufficient fresh water resources, poor salt resistance, etc., to achieve reduced utilization and solve fresh water resources Insufficient, good effect of salt tolerance
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Embodiment 1
[0045] A preparation method of a temperature-resistant and salt-resistant viscoelastic surfactant, comprising the following steps:
[0046](1) Dissolve p-aminobenzoic acid and epichlorohydrin in a mixed solvent 1 formed by mixing water and methanol at a volume ratio of 2:2, then add sodium hydroxide, and heat to 50°C for 7 hours to obtain intermediate 1 ; The molar ratio of p-aminobenzoic acid, epichlorohydrin and sodium hydroxide is 1:2:1;
[0047] (2) Add erucamide propyl dimethylamine and intermediate one obtained in step (1) into 20 wt% ethanol solution, heat to 70° C. for 15 h to obtain intermediate two; erucamide propyl dimethylamine and The intermediate-molar ratio is 2:1;
[0048] (3) Dissolve the intermediate two obtained in step (2) in the mixed solvent two formed by mixing ethyl acetate and ethanol at a volume ratio of 9:2 at a temperature of 40°C, recrystallize at a temperature of 0°C, and finally Evaporate and dry at 70°C and 200r / min to obtain a heat-resistant ...
Embodiment 2
[0050] A preparation method of a temperature-resistant and salt-resistant viscoelastic surfactant, comprising the following steps:
[0051] (1) Dissolve p-aminobenzoic acid and epichlorohydrin in a mixed solvent 1 formed by mixing water and methanol at a volume ratio of 2:3, then add sodium hydroxide, and heat to 50°C for 8 hours to obtain intermediate 1 ; The molar ratio of p-aminobenzoic acid, epichlorohydrin and sodium hydroxide is 1:2:1;
[0052] (2) Add oleic amidopropyl dimethylamine and intermediate one obtained in step (1) into 20 wt% ethanol solution, heat to 80° C. for 16 hours to obtain intermediate two; oleic amidopropyl dimethylamine and Intermediate-molar ratio is 2.5:1;
[0053] (3) Intermediate 2 obtained in step (2) was dissolved in a mixed solvent 2 formed by mixing ethyl acetate and ethanol at a volume ratio of 10:2 at a temperature of 45°C, and then recrystallized at a temperature of 2°C, and finally Evaporate and dry at 80°C and 300r / min to obtain a heat...
Embodiment 3
[0055] A preparation method of a temperature-resistant and salt-resistant viscoelastic surfactant, comprising the following steps:
[0056] (1) Dissolve p-aminobenzoic acid and epichlorohydrin in a mixed solvent 1 formed by mixing water and ethanol at a volume ratio of 2:5, then add sodium hydroxide, and heat to 50°C for 9 hours to obtain intermediate 1 ; The molar ratio of p-aminobenzoic acid, epichlorohydrin and sodium hydroxide is 1:2:1;
[0057] (2) Add stearic acid amidopropyl dimethylamine and intermediate one obtained in step (1) into a 30wt% ethanol solution, heat to 90° C. for 17 hours to obtain intermediate two; stearic acid amidopropyl dimethyl The molar ratio of amine to intermediate is 2.5:1;
[0058] (3) Dissolve the intermediate 2 obtained in step (2) in a mixed solvent 2 formed by mixing ethyl acetate and ethanol at a volume ratio of 10:2 at a temperature of 50° C., recrystallize at a temperature of 3° C., and finally Evaporate and dry at 90°C and 400r / min to...
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