Modified polyolefin porous membrane with super wettability, preparation method and application
A polyolefin and porous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as changing the surface charge density of the membrane, and achieve the purpose of changing the hydrophobicity, improving the separation efficiency and simple preparation method. Effect
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[0046] In order to achieve the above-mentioned technical purpose, as an aspect of the application, the application provides a method for preparing a super-wettable modified polyolefin porous membrane, including:
[0047] Polyolefin porous membrane matrix material;
[0048] Activating the above-mentioned polyolefin porous membrane base material, so that the above-mentioned polyolefin porous membrane base material generates free radicals or active groups, and obtains an activated polyolefin porous membrane;
[0049] Performing a symmetrical chemical grafting reaction on both sides of the activated polyolefin porous membrane with an ethylenically polymerizable monomer containing carboxyl, amide, cyano, hydroxyl or amine groups to obtain a grafted polyolefin porous membrane;
[0050] Using a post-treatment solution corresponding to the type of polymerizable monomer, the above-mentioned grafted polyolefin porous membrane is post-treated, washed, and dried to obtain a modified polyo...
Embodiment 1
[0088] A modified polyolefin porous membrane with super wettability and its preparation method, the polypropylene nanofiber membrane is prepared by a dry biaxial stretching method; the obtained polypropylene nanofiber membrane is subjected to 20kGy under electron beam irradiation conditions Irradiation dose irradiation; the irradiated film is placed in the grafting reaction solution and deoxygenated with nitrogen for 30 minutes. Under the condition of heating in a water bath, the grafting reaction is carried out in a 20wt% acrylic acid solution for 60 minutes at 60 ° C to prepare a functional The grafted polypropylene porous membrane has a grafting rate; the above-mentioned functionalized grafted polypropylene porous membrane is reacted in a 25wt% sodium bicarbonate solution at 50°C for 30 minutes under the condition of heating in a water bath, and then reacted with a salt solution The functionalized grafted polypropylene porous membrane was washed with water to prepare a modif...
Embodiment 2
[0097] A modified polyolefin porous membrane with super wettability and its preparation method, the polyethylene nanofiber membrane is prepared by a wet biaxial stretching method; the obtained polyethylene nanofiber membrane is subjected to 10kGy under cobalt source irradiation Irradiation dose irradiation; the irradiated polyethylene nanofiber membrane was placed in the grafting reaction solution and used nitrogen to remove oxygen for 40min, under the condition of heating in a water bath, in 60°C of 15wt% acrylic acid and acrylonitrile (1: 1) reacted in the mixed grafting reaction solution for 30min to prepare a functionalized grafted polyethylene porous membrane; the above-mentioned functionalized grafted polyethylene porous membrane was heated in a water bath in a 5wt% hydroxylamine hydrochloride solution at 60°C React in medium for 40min, the amidoxime reaction is completed, after washing with water, in 10wt% sodium hydroxide solution at 50°C, react with alkali for 40min, w...
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