A kind of microporous membrane material, preparation method and application thereof
A technology of microporous membrane and membrane, applied in chemical instruments and methods, preparation of test samples, ultrafiltration, etc., can solve the problems of unstable test results and low recovery rate, avoid adsorption and improve accuracy , the effect of expanding the scope of application
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[0061] Correspondingly, the present invention also provides a method for preparing the above-mentioned microporous filter membrane material, which may include the following steps: subjecting the hydrolyzed polyamide filter membrane obtained by hydrolysis of the polyamide filter membrane to an amidation reaction to form a benzoyl group.
[0062] Specifically, the hydrolyzed polyamide filter membrane is mixed with benzoic acid, so that the amino groups in the hydrolyzed polyamide filter membrane are reacted with benzoic acid to form a benzoyl group to obtain a benzoyl group surface-modified microporous filter membrane material.
[0063] By hydrolyzing the polyamide filter membrane in an alkaline solution, the amino groups on the membrane surface can be exposed and activated (that is, the amide bonds on the surface of the polyamide filter membrane are converted into active amino groups), which is beneficial to the subsequent reaction with benzoic acid. Then, it is mixed with benzo...
Embodiment 1
[0106] The present embodiment provides a preparation method of a benzoyl surface-modified polyamide microporous membrane material, which is specifically as follows:
[0107] Step (1): Weigh 2.00g of sodium hydroxide, dissolve it with about 200mL of 95vt% ethanol-water solution, let stand until the sodium hydroxide solution is cooled to room temperature, and transfer all the cooled sodium hydroxide solution to a 1000mL volumetric flask , wash the beaker twice with 100mL 95vt% ethanol-water solution, transfer the solution to a volumetric flask, and then dilute to 1000mL with 95vt% ethanol-water solution, which is 0.05mol / L sodium hydroxide-95vt% ethanol-water solution;
[0108] Step (2): Take 400mL of 0.1mol / L sodium hydroxide-95vt% ethanol-water solution in a 500mL wide-mouth bottle, completely immerse a polyamide membrane with a pore size of 0.2-0.5μm in the solution, and place it in a constant temperature oscillator at Hydrolyzed for 20 min at 60°C and 200 rpm to obtain a hyd...
Embodiment 2
[0129] The difference between this embodiment and embodiment 1 is (the remaining operation steps and conditions are the same):
[0130] The alkaline solution used for hydrolysis is 0.01mol / L sodium hydroxide-80vt% ethanol aqueous solution.
[0131] The hydrolysis temperature was 20°C, and the hydrolysis time was 30 min.
[0132] The first wash was a 45 vt% ethanol-water solution.
[0133] The benzoic acid-containing solution was a 1 vt% benzoic acid-ethanol solution.
[0134] The amidation reaction temperature was 50°C, and the amidation reaction time was 60 min.
[0135] The second wash was a 45 vt% ethanol-water solution.
[0136] Drying was carried out at 45°C for 70 minutes.
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