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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

Inactive Publication Date: 2018-10-16
苏州苏瑞膜纳米科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

POSS has great potential in the development of new high-flux and high-salt rejection reverse osmosis membranes. At present, patents with application numbers 201710579640 and 201710587996 introduce octavinyl-POSS into the aromatic polyamide functional layer of the reverse osmosis membrane respectively. structure, octaamino-POSS structure to improve the separation performance of the reverse osmosis membrane, although the separation and permeability of the modified membrane have been improved to a certain extent, but there are still the following problems: The amount increased by only 50%, did not improve the fouling resistance of the membrane, and did not improve the chlorine resistance of the membrane

Method used

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  • Polyhydroxy POSS-modified reverse osmosis composite membrane and preparation method thereof
  • Polyhydroxy POSS-modified reverse osmosis composite membrane and preparation method thereof
  • Polyhydroxy POSS-modified reverse osmosis composite membrane and preparation method thereof

Examples

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preparation example Construction

[0027] As an aspect of the technical solution of the present invention, it relates to a method for preparing a reverse osmosis composite membrane modified by polyhydroxy cage silsesquioxane, which includes:

[0028] The base film is first contacted with a reaction system containing polyhydroxyl-functionalized cage silsesquioxane nanoparticles and polyamines, and then contacted with polybasic acid chlorides, and the polyhydroxyl-functionalized caged silsesquioxane nanoparticles Particles, polyamines and polyacyl chlorides are subjected to interfacial polymerization to obtain a reverse osmosis composite membrane modified by polyhydroxy cage silsesquioxane.

[0029] In some embodiments, the preparation method specifically includes:

[0030] providing an aqueous polyamine solution comprising the polyhydroxyl-functionalized cage silsesquioxane nanoparticles;

[0031] The base film is soaked in the polyamine aqueous solution, and then soaked in the polyacyl chloride organic solutio...

Embodiment 1

[0075] Step 1. Preparation of Octahydroxyl Functionalized Caged Silsesquioxane Nanoparticles

[0076] Octahydroxyl-functionalized cage silsesquioxane nanoparticles are prepared by click chemistry of octavinyl silsesquioxane (OvPOSS) and small molecules of mercapto alcohols, and the reaction mechanism is double bond-thiol-ene Free radical addition. First, the initiator is excited by absorbing photons under the action of heat or light, cracks and generates free radicals; then, the newly generated free radicals will capture a hydrogen atom (H) on the mercapto group (-SH) to generate mercapto free radicals. Then the mercapto free radical will attack the carbon-carbon double bond (C=C), and the active center will transfer to generate a carbon free radical; process, the free radical addition of thiol-double bond (thiol-ene) can be completed, and its typical chemical reaction formula is as follows figure 2 shown.

[0077] Step 2. Prepare basement membrane

[0078] Polysulfone-ba...

Embodiment 2

[0088]This example is basically the same as Example 1, except that in Step 3, the ratio of octahydroxy-functionalized cage-type silsesquioxane nanoparticles to m-phenylenediamine is 1:50.

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Abstract

The invention discloses a polyhydroxy POSS-modified reverse osmosis composite membrane and a preparation method thereof. The preparation method comprises the following steps: providing an aqueous solution of polyamine containing polyhydroxy-functionalized POSS nanoparticles; infiltrating a base membrane in the aqueous solution of polyamine; infiltrating in an organic solution of polyacyl chlorideafter taking out; and performing interfacial polymerization on the polyhydroxy-functionalized POSS nanoparticles, polyamine and polyacyl chloride to obtain the polyhydroxy POSS-modified reverse osmosis composite membrane. The polyhydroxy POSS-modified reverse osmosis composite membrane prepared by the method of the invention has high reflux and desalinization rate, also has greatly improved pollution resistance and chlorine resistance, is simple in preparation process and convenient for large-scale production, can be widely applied to seawater desalination and other fields.

Description

technical field [0001] The invention belongs to the technical field of preparation of reverse osmosis membranes, in particular to a reverse osmosis composite membrane modified by polyhydroxy cage silsesquioxane and a preparation method thereof. Background technique [0002] Reverse osmosis membrane is the core of reverse osmosis technology. Compared with other reverse osmosis membranes, aromatic polyamide composite membrane has higher flux and desalination rate, better pressure resistance and acid-base tolerance range. In reverse osmosis technology The most widely used. However, polyamide composite membranes have limited their development in the field of seawater desalination technology due to their high energy consumption, weak pollution resistance and poor chlorine resistance. question. [0003] The polyamide composite reverse osmosis membrane is composed of a porous support layer and a functional layer, among which the porous support layer is generally composed of non-w...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D71/56B01D69/12B01D61/02C02F1/44C02F103/08
CPCB01D61/025B01D69/125B01D71/56B01D71/82C02F1/441C02F2103/08Y02A20/131
Inventor 不公告发明人
Owner 苏州苏瑞膜纳米科技有限公司
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