Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of high flux polytetrafluoroethylene composite nanofiltration membrane

A technology of polytetrafluoroethylene and composite nanofiltration membrane, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of large thickness and compactness of the separation layer, slow down interface polymerization, etc., and achieve slow down interface polymerization Reaction, high water flux, effect of improving filtration efficiency

Active Publication Date: 2020-08-18
浙江奥氏环境科技有限公司
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of excessive thickness and compactness of the separation layer caused by too fast interfacial polymerization in the prior art, and to provide a high-flux polymer four that can slow down the interface polymerization and reasonably control the thickness and compactness of the separation layer. Preparation method of vinyl fluoride composite nanofiltration membrane

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of high flux polytetrafluoroethylene composite nanofiltration membrane
  • A kind of preparation method of high flux polytetrafluoroethylene composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation method of hydrophilic polytetrafluoroethylene microfiltration membrane comprises the following steps:

[0033] Add polyacrylic acid to 60% ethanol aqueous solution to prepare a polyacrylic acid solution with a mass concentration of 2%, use sodium hydroxide to adjust the pH of the solution to 7.2, add γ-glycidyl etheroxypropyltrimethoxysilane, γ- The mass ratio of glycidyl etheroxypropyl trimethoxysilane to polyacrylic acid is 1:4, stir and mix evenly, then immerse the polytetrafluoroethylene microfiltration membrane in the above solution, add triphenylphosphine catalyst, triphenylphosphine catalyst The amount of addition is 2.5wt% of the mass of polyacrylic acid, and the reaction is carried out at 63°C for 2.5 hours. After the reaction is completed, it is cooled to room temperature, and 0.2mol / L HCl solution is slowly added dropwise to adjust the pH to 6.2, and the reaction is carried out for 4 hours. The vinyl fluoride microfiltration membrane is washed...

Embodiment 2

[0043] The preparation method of hydrophilic polytetrafluoroethylene microfiltration membrane comprises the following steps:

[0044] Add polyacrylic acid to 60% ethanol aqueous solution to prepare a polyacrylic acid solution with a mass concentration of 1%, use sodium hydroxide to adjust the pH of the solution to 7.2, add γ-glycidyl etheroxypropyltrimethoxysilane, γ- The mass ratio of glycidyl etheroxypropyl trimethoxysilane to polyacrylic acid is 1:4, stir and mix evenly, then immerse the polytetrafluoroethylene microfiltration membrane in the above solution, add triphenylphosphine catalyst, triphenylphosphine catalyst The amount of addition is 2.2wt% of the mass of polyacrylic acid, and the reaction is carried out at 63°C for 2.3 hours. After the reaction is completed, it is cooled to room temperature, and 0.2mol / L HCl solution is slowly added dropwise to adjust the pH to 6.2, and the reaction is carried out for 4 hours. The vinyl fluoride microfiltration membrane is washed...

Embodiment 3

[0054] The preparation method of hydrophilic polytetrafluoroethylene microfiltration membrane comprises the following steps:

[0055] Adding polyacrylic acid into a 60% ethanol aqueous solution to prepare a polyacrylic acid solution with a mass concentration of 4%, using sodium hydroxide to adjust the pH of the solution to 7.2, adding γ-glycidyl etheroxypropyltrimethoxysilane, γ- The mass ratio of glycidyl etheroxypropyltrimethoxysilane to polyacrylic acid is 1:5, stir and mix evenly, then immerse the polytetrafluoroethylene microfiltration membrane in the above solution, add triphenylphosphine catalyst, triphenylphosphine catalyst The amount of addition is 2.5wt% of the mass of polyacrylic acid, and the reaction is carried out at 64°C for 2.5 hours. After the reaction is completed, it is cooled to room temperature, and 0.25mol / L HCl solution is slowly added dropwise to adjust the pH to 6.2, and the reaction is carried out for 4 hours. The vinyl fluoride microfiltration membra...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
porosityaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of water treatment and environmental protection and discloses a preparation method of a high-throughput composite nano-filtering membrane. The method includes: 1) soaking a hydrophilic polytetrafluoroethylene micro-filtration membrane in an oil phase solution and allowing the solution to stand for 2-5 min; 2) moving out the membrane and soaking the membrane in a carboxymethylcellulose solution and allowing the solution to stand for 3-8 min; 3) moving out the membrane and allowing the membrane to stand for 10-20 min in air; 4) soaking the membrane ina water phase solution for a heat insulation reaction for 40-60 min at 30-40 DEG C to obtain initial composite nano-filtering membrane; 5) heating the nano-filtering membrane for curing and crosslinking the membrane, washing the membrane in deionized water, and drying the membrane to obtain the high-throughput composite nano-filtering membrane. By slowing down the interfacial polymerization reaction, thickness of a separation layer is reasonably controlled, so that the nano-filtering membrane is high in water throughput and improved in separation efficiency, and is suitable for water softening, wastewater treatment, seawater desalting, etc.

Description

technical field [0001] The invention relates to the technical field of water treatment and environmental protection, in particular to a preparation method of a high-flux polytetrafluoroethylene composite nanofiltration membrane. Background technique [0002] Nanofiltration is a pressure-driven osmosis process with separation performance between reverse osmosis and ultrafiltration. The retention performance of the nanofiltration process is better than that of the ultrafiltration process, and the size of the solute that can be retained is much smaller than that of the ultrafiltration process. The operating pressure required by nanofiltration is much lower than that of reverse osmosis, thus greatly reducing the energy consumption and operating costs of the separation process. The emergence of nanofiltration not only fills the gap between ultrafiltration and reverse osmosis, improves the membrane separation spectrum, but also has important use value because of the simple realiz...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/12B01D71/36B01D71/56
CPCB01D61/027B01D67/0006B01D69/02B01D69/12B01D71/36B01D71/56B01D2325/36B01D2325/48Y02A20/131
Inventor 陈超王建吴佩佩
Owner 浙江奥氏环境科技有限公司