Polyhydroxy POSS-modified reverse osmosis composite membrane and preparation method thereof
A technology of reverse osmosis composite membrane and silsesquioxane, which is applied in the direction of semi-permeable membrane separation, reverse osmosis, chemical instruments and methods, etc., can solve the problems of no improvement in chlorine resistance and membrane pollution resistance, and achieve Effects of high permeability and separation performance, increase in free volume, and enhanced permeability
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[0027] As an aspect of the technical solution of the present invention, it relates to a method for preparing a polyhydroxy cage silsesquioxane modified reverse osmosis composite membrane, which includes:
[0028] The base film is first contacted with a reaction system containing polyhydroxy functionalized cage silsesquioxane nanoparticles and polyamines, and then contacted with polyacid chlorides, and the polyhydroxy functionalized cage silsesquioxane nano particles Particles, polyamine and polyacid chloride undergo interfacial polymerization reaction to obtain a polyhydroxy cage silsesquioxane modified reverse osmosis composite membrane.
[0029] In some embodiments, the preparation method specifically includes:
[0030] Providing an aqueous polyamine solution containing the polyhydroxy functionalized cage silsesquioxane nanoparticles;
[0031] The base film is immersed in the polyamine aqueous solution, taken out and then immersed in the polyacid chloride organic solution, so that t...
Example Embodiment
[0074] Example 1
[0075] Step 1. Prepare octahydroxy-functionalized cage silsesquioxane nanoparticles
[0076] The octahydroxy-functionalized cage silsesquioxane nanoparticles are prepared by click chemistry of octavinylsilsesquioxane (OvPOSS) and mercapto alcohol small molecules. The reaction mechanism is a double bond-thiol-ene Free radical addition. First, the initiator absorbs photons under the action of heat or light to be excited, cleaves and generates free radicals; then, the newly generated free radicals will deprive a hydrogen atom (H) on the sulfhydryl (-SH) group to generate sulfhydryl free radicals. Then the mercapto radical will attack the carbon-carbon double bond (C=C), and the active center will be transferred to generate a carbon radical; the carbon radical will deprive the O atom on the thiol compound to regenerate the thiol radical, repeat the above The process can complete the free radical addition of thiol-ene. Its typical chemical reaction formula is as fi...
Example Embodiment
[0087] Example 2
[0088] This example is basically the same as Example 1, except that the ratio of octahydroxy-functionalized cage silsesquioxane nanoparticles to m-phenylenediamine in step 3 is 1:50.
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