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Polysulfone-based membrane, reverse osmosis composite membrane containing polysulfone-based membrane and preparation method

A technology of reverse osmosis composite membrane and polysulfone-based membrane, applied in the field of reverse osmosis composite membrane, can solve problems such as performance stability and service life gap

Active Publication Date: 2021-04-30
中化(宁波)润沃膜科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main reason is that there is a big gap with foreign products in terms of product performance stability and service life

Method used

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  • Polysulfone-based membrane, reverse osmosis composite membrane containing polysulfone-based membrane and preparation method
  • Polysulfone-based membrane, reverse osmosis composite membrane containing polysulfone-based membrane and preparation method
  • Polysulfone-based membrane, reverse osmosis composite membrane containing polysulfone-based membrane and preparation method

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Embodiment 1

[0117] 1. Preparation of chloromethylated polysulfone: Weigh 900g of polysulfone and place it in a reaction kettle, add 15L of chloroform to dissolve it, pass nitrogen protection in the reaction kettle, and then add paraformaldehyde and trimethyl chloride with a mass ratio of 1:2 A total of 450g of silane was added, and finally 180ml of tin tetrachloride was added and reacted at 20°C for 72 hours. After the reaction, the product is poured into a methanol solution for reverse precipitation, and the precipitated product is washed with reverse osmosis (RO) water, and then dried in a vacuum oven to obtain chloromethylated polysulfone. The obtained chloromethylated polysulfone The degree of substitution is 0.86mmol / g.

[0118] 2. Preparation of chloromethylated polysulfone base membrane: prepare a casting solution with a mass fraction of chloromethylated polysulfone of 17.5%, and the solvent is dimethylformamide. The casting liquid is coated on a non-woven fabric with a thickness ...

Embodiment 2

[0123] 1. Preparation of chloromethylated polysulfone: Weigh 900g of polysulfone and place it in a reaction kettle, add 15L of chloroform to dissolve it, pass nitrogen protection in the reaction kettle, and then add paraformaldehyde and trimethyl chloride with a mass ratio of 1:2 A total of 450g of silane was added, and finally 180ml of tin tetrachloride was added and reacted at 20°C for 72 hours. After the reaction, the product is poured into a methanol solution for reverse precipitation, and the precipitated product is washed with reverse osmosis (RO) water, and then dried in a vacuum oven to obtain chloromethylated polysulfone. The obtained chloromethylated polysulfone The degree of substitution is 0.86mmol / g.

[0124] 2. Preparation of polysulfone grafted with octaamino POSS on the surface: a casting solution with a mass fraction of chloromethylated polysulfone of 17.5% was prepared, and the solvent was dimethylformamide. The casting solution is coated on a glass slide, a...

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Abstract

The invention provides a polysulfone base membrane, a reverse osmosis composite membrane containing the polysulfone base membrane and a preparation method of the reverse osmosis composite membrane. The polysulfone base membrane comprises halomethylated polysulfone of which the surface is grafted with polyamino polyhedral oligomeric silsesquioxane. The reverse osmosis composite membrane comprises a polysulfone base membrane and a polyamide separation layer formed on the polysulfone base membrane. The polyamino polyhedral oligomeric silsesquioxane is grafted on the surface of the polysulfone base membrane to enhance the bonding strength between the base membrane and the separation layer, thereby enhancing the service performance of the reverse osmosis composite membrane. While the same or better water flux and desalination rate are ensured, the bonding strength of the reverse osmosis membrane base membrane and the separation layer is greatly improved, and the mechanical strength and stability of the separation layer are improved, so that the physical and chemical cleaning resistance of the reverse osmosis membrane is improved, the service life of the reverse osmosis membrane is prolonged, and the product competitiveness is enhanced.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis composite membranes, in particular to a polysulfone base membrane, a reverse osmosis composite membrane containing the polysulfone base membrane and a preparation method thereof. Background technique [0002] After more than 50 years of development, the reverse osmosis composite membrane has been widely used in various fields such as water treatment, medicine, energy, and chemical industry. Domestic R&D and industrialization of reverse osmosis membranes started relatively late, and the current market is mainly monopolized by foreign brands, while domestic brands have a relatively low market share and are still relatively concentrated in low-end products. The main reason is that there is a big gap with foreign products in terms of product performance stability and service life. [0003] The reverse osmosis membrane is a composite membrane consisting of three different materials, for exampl...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D71/68
CPCB01D69/125B01D67/0002B01D67/0006B01D71/68Y02A20/131
Inventor 崔健钮振强殷勇张韦海曹敏郝长青曹春朱建军
Owner 中化(宁波)润沃膜科技有限公司
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