Polymer membrane for mixing and ultrafilter and its preparing process

A technology of ultrafiltration membranes and polymers, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult use, whitening, and limited membranes, and achieve the effect of improving anti-pollution

Inactive Publication Date: 2002-12-04
TSINGHUA UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There are many harsh conditions and difficulties in the preparation of polymer blend membranes by phase inversion
First: It is required that the blended polymers must have a certain compatibility; Second: The polymer blend can be dissolved in a suitable solvent, and the formed polymer blend solution has relative stability and good film formation. Third: After some polymer blend solutions form a film, due to the evaporation and diffusion of the solvent, microphase separation occurs between the polymers, white flocs appear in the film-forming solution or completely white, and the obtained film Wrinkled or even cracked, the membrane is difficult to use in the ultrafiltration process
[0008] Based on the above reasons, the blend systems that have been discovered and used to prepare ultrafiltration membranes are very limited.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 2.5 grams of chloromethylated polysulfone and 7.5 grams of polyvinylidene fluoride were dissolved in 88 ml of dimethyl sulfoxide, and the chloromethyl content of the chloromethylated polysulfone was 2.2 mol / kg (meq / g); After the polymer is completely dissolved, it is filtered and left standing for defoaming. Using ultrafiltration water as the coagulation medium, the ultrafiltration membrane is prepared by the phase inversion method, and the thickness of the membrane is about 200 μm. The membrane has an operating pressure of 0.1MPa and a pure water flux of 445.6L / m 2 h, the rejection rate of 0.1 g / L bovine serum albumin aqueous solution is 82.7%.

Embodiment 2

[0057] 4 grams of chloromethylated polysulfone and 8 grams of polyvinylidene fluoride were dissolved in 86 ml of dimethyl sulfoxide, and the chloromethyl content of the chloromethylated polysulfone was 2.2 mol / kg (meq / g); After the polymer is completely dissolved, add 3 grams of polyethylene glycol 600. After the dissolution is uniform, filter and stand for defoaming, use ultrafiltered water as the coagulation medium, and the temperature of the coagulation medium is 10°C. Filter membrane with a thickness of about 200 μm. The membrane has an operating pressure of 0.1MPa and a pure water flux of 380.2L / m 2 h, the rejection rate of 0.1 g / L bovine serum albumin aqueous solution is 65.4%.

Embodiment 3

[0059] Dissolve 2.5 grams of chloromethylated polysulfone and 10 grams of polyvinylidene fluoride in 88 milliliters of dimethyl sulfoxide, and the chloromethyl content of the chloromethylated polysulfone is 2.2 mol / kg (meq / g); After the polymer is completely dissolved, it is filtered and left standing for defoaming. Using ultrafiltration water as the coagulation medium, the ultrafiltration membrane is prepared by the phase inversion method, and the thickness of the membrane is about 200 μm. The membrane has an operating pressure of 0.1MPa and a pure water flux of 144.4L / m 2 h, the rejection rate of 0.1 g / L bovine serum albumin aqueous solution is 86.1%, and the pure water flux attenuation coefficient m 1 It is 16.8; the pure water flux recovery coefficient of cathodic electrophoretic paint is 204.5.

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
glass transition temperatureaaaaaaaaaa
Login to view more

Abstract

A mixed polymers ultrafilter membrane is prepared from chloromethyl polysulfone (10-60%) containing chloromethyl content of 1.1-3.5 milligram equivalent /g and poly floroethyene, which are dissolved in dimethyl sulfoxide solvent by phase transfer method. The concentration of said mixture is 8-12%. Its advantage is higher pollution resistance.

Description

technical field [0001] The invention belongs to the technical field of separation and concentration of cathodic electrophoretic paint, and in particular relates to the composition and membrane-making process of an ultrafiltration membrane. Background technique [0002] Polymeric membranes have been widely used in ultrafiltration processes. For special separation systems, polymer membranes need to be functionalized to have specific chemical or physical structures. Charged and blending method is one of the important ways. [0003] The blending method improves the properties of the membrane material through the complementarity and synergistic effect between the constituent polymers, and adjusts the membrane structure and controls the membrane performance through the compatibility difference between the constituent polymers. To sum up, the blending method has several functions: [0004] (1) Change the structure of the membrane: By changing the composition of the casting solut...

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): B01D71/34B01D71/68B01D71/76
Inventor 郝继华陈翠仙余立新李琳蒋维钧
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap