Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A polyvinylidene fluoride ultrafiltration membrane and preparation method thereof

A polyvinylidene fluoride and ultrafiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as poor rejection rate, poor anti-pollution ability, and weak hydrophilicity

Inactive Publication Date: 2016-08-17
GUANGDONG PAPER IND RES INST
View PDF2 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 solve the problems of weak hydrophilicity, water permeability, rejection rate and poor anti-pollution ability of the existing polyvinylidene fluoride ultrafiltration 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

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0005] Embodiment 1: ① Dissolve LiCl in N,N-dimethylformamide at room temperature to prepare a dissolving agent with a mass concentration of 0.5%.

[0006] ②Heating the dissolving agent, at 65 ° C, the ternary blend polymer material with a mass ratio of PVDF:CA:PMMA of 9:0.5:0.5 was stirred and dissolved in the dissolving agent for 4 hours until it was completely dissolved to obtain a total mixture.

[0007] ③ Cool down to 50°C, add glacial acetic acid:NMP additive with a mass ratio of 0.5:1 to the blend, stir and mix for 1.5 hours to make a casting solution. Vacuum the casting solution for 4 hours to remove bubbles.

[0008] ④ Apply the defoamed casting solution on the film forming device to form it, and place the formed film together with the film forming plate in a dryer at a temperature of 92°C for 7 minutes. Quickly put the dried film together with the film-forming plate into a tap water gel bath at room temperature, soak for 3 minutes and shake the film-forming plate s...

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is: ① in the step, the LiCl / N, N-dimethylformamide solution with a dissolving agent mass concentration of 1%; ② in the step, the ternary total The polymer material of the mixture is PVDF:CA:PMMA with a mass ratio of 8:1:1, a dissolution temperature of 70° C., and a dissolution time of 4.5 hours. ③ In the step, the additive glacial acetic acid:NMP mass ratio is 1:1.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment one is: 1. in the step, the LiCl / N, N-dimethylformamide solution with a dissolving agent mass concentration of 1.5%; 2. in the step, the ternary total The polymer material of the mixture is PVDF:CA:PMMA with a mass ratio of 7:1.5:1.5, a dissolution temperature of 75° C., and a dissolution time of 5 hours. ③ In the step, the additive glacial acetic acid:NMP mass ratio is 1:1. ④ In the step, the drying temperature is 100°C, and the drying time is 9 minutes.

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
crystallinityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof. The preparation method comprises the following steps: at 50-90 DEG C, dissolving polyvinylidene fluoride, cellulose acetate and polymethylmethacrylate together in N,N-dimethyl formamide solution of lithium chloride, then adding a certain amount of glacial acetic acid and N-methyl pyrrolidone additive at 40-60 DEG C to prepare casting membrane liquid, forming the casting membrane liquid on a membrane forming plate by utilizing a membrane forming device after standing or defoaming through vacuum pumping, placing the formed membrane in a dryer at the temperature of 90-105 DEG C for drying for 4-15 min, then fast placing the membrane in water bath at the temperature of 0-30 DEG C, slightly oscillating after dipping for 1-5 min to enable the membrane to fall off the membrane forming plate automatically, and taking the membrane out for naturally drying to prepare a polyvinyl chloride membrane. According to the invention, by adopting a ternary polymer material for preparing the membrane through blending, the hydrophilicity and toughness of the polyvinylidene fluoride membrane are greatly enhanced; and moreover, the preparation technology is simple and practicable, and shorter in production cycle.

Description

technical field [0001] The invention belongs to the technical field of polymer membrane preparation, and relates to a method for preparing an ultrafiltration membrane by ternary blending polymer materials. Background technique [0002] Polyvinylidene fluoride is a new type of fluorocarbon thermoplastic. Polyvinylidene fluoride is a white powder semi-crystalline polymer with a crystallinity of 60% to 80%. The general fluorine content is 59% and the density is 1.75 to 1.789. / cm 3 , water absorption < 0.04%, glass transition temperature is -39°C, embrittlement temperature is below -62°C, crystallization melting point is about 170°C, thermal decomposition temperature is greater than 316°C, and the long-term use temperature range is -40°C to 150°C. One of the most important features is high toughness with a tensile strength of 500kg / cm 2 , the impact strength and wear resistance are also good, and it also has excellent weather resistance and chemical stability. Its performa...

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): B01D71/34B01D67/00
Inventor 刘文许桂红张燕兴
Owner GUANGDONG PAPER IND RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com