Polyvinylidene fluoride filter membrane as well as preparation method and application thereof

A polyvinylidene fluoride and filter membrane technology, applied in the field of membrane materials, can solve the problems of limiting the development and application of polyvinylidene fluoride filter membranes, high time cost, poor tensile strength, etc., and achieve high cost performance, large nano The effect of increasing the amount of dirt and improving the tensile strength

Active Publication Date: 2021-03-16
HANGZHOU COBETTER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fluorine-containing polymer filter membranes mainly include polyvinylidene fluoride filter membranes, polytetrafluoroethylene filter membranes, and polyperfluoroethylene propylene filter membranes. Among them, polyvinylidene fluoride filter membranes have excellent chemical corrosion resistance and Heat resistance, some people tend to use PVDF membrane for terminal filtration of raw liquid. PVDF membrane has lower adsorption than PES membrane, especially for lower protein absorption, higher yield and more stable flux, so it is widely used It is used in the field of biopharmaceuticals and sterilization filtration; however, the existing polyvinylidene fluoride membrane also has certain shortcomings, such as its flow rate is too small, the filtration time is long, resulting in high time cost; at the same time, some polyvinylidene fluoride The tensile strength of vinylidene fluoride membrane is poor; the existence of the above shortcomings greatly limits the development and application of polyvinylidene fluoride membrane

Method used

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  • Polyvinylidene fluoride filter membrane as well as preparation method and application thereof
  • Polyvinylidene fluoride filter membrane as well as preparation method and application thereof
  • Polyvinylidene fluoride filter membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A preparation method of a polyvinylidene fluoride filter membrane, comprising the following steps:

[0063] Step 1: configuring the casting solution, and casting it on the carrier to form a nascent film; the casting solution includes the following components by weight: 13 parts of PVDF resin, 3 parts of small molecule additives and 84 parts of the first organic solvent; Among them, the number average molecular weight of PVDF resin is 1 million, the small molecule additive is LiCl; the first organic solvent is N-methylpyrrolidone;

[0064] Step 2: Place the primary film in an air environment with a temperature of 20°C and an absolute humidity of 25g H 2 The air flow of 0 / kg is blown to the surface of the primary film for pre-separation treatment, the relative velocity between the air flow and the liquid film is 65m / min, and the duration is 18s. At this moment, the cloud point just reached, and the pre-separation is completed;

[0065] Step 3: Place the primary film afte...

Embodiment 2

[0067] A preparation method of a polyvinylidene fluoride filter membrane, comprising the following steps:

[0068] Step 1: configure the casting solution, and cast it on the carrier to form a nascent film; the casting solution includes the following components by weight: 18 parts of PVDF resin, 4 parts of small molecule additives, 76 parts of the first organic solvent and 2 parts of deionized water; wherein the number average molecular weight of the PVDF resin is 500,000, the small molecule additive is tetrahydrofuran; the first organic solvent is triethyl phosphate;

[0069] Step 2: Place the primary film in an air environment with a temperature of 30°C and an absolute humidity of 21g H 2 The air flow of 0 / kg is blown onto the surface of the primary film for pre-separation treatment, the relative velocity between the air flow and the liquid film is 6m / s, and the duration is 13s. At this moment, the cloud point is just reached, and the pre-separation is completed;

[0070] St...

Embodiment 3

[0072] A preparation method of a polyvinylidene fluoride filter membrane, comprising the following steps:

[0073] Step 1: configure the casting solution, and cast it on the carrier to form a nascent film; the casting solution includes the following components by weight: 15 parts of PVDF resin, 3 parts of small molecule additives and 82 parts of the first organic solvent; Among them, the number average molecular weight of PVDF resin is 800,000, and the small molecule additive is acetone; the first organic solvent is dimethylacetamide;

[0074] Step 2: Place the primary film in an air environment with a temperature of 15°C and an absolute humidity of 29g H 2 The air flow of 0 / kg is blown onto the surface of the primary film for pre-separation treatment, the relative velocity between the air flow and the liquid film is 55m / min, and the duration is 16s. At this moment, the cloud point is just reached, and the pre-separation is completed;

[0075] Step 3: Place the primary film a...

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Abstract

The invention provides a polyvinylidene fluoride filter membrane as well as a preparation method and application thereof. The outer surface of the filter membrane comprises a plurality of coiled fibers for forming a porous structure, the coiled fibers are thin and fine coiled fibers with non-uniform structures along the length of the fibers, the average length of the coiled fibers is 3-8 microns,and the average width of the coiled fibers is 0.2-0.6 microns. The water complete bubble point of the filter membrane is 240-420 KPa. The polyvinylidene fluoride filter membrane has higher flow rate and higher tensile strength, is wide in application range, and is particularly suitable for the fields of biopharmacy and degerming filtration. In addition, the invention also provides a preparation method of the filter membrane, the filter membrane is prepared by taking PVDF resin, a small molecular additive and a first organic solvent as raw materials through reaction, and the small molecular additive is at least one of LiCl, NH4Cl, nano silicon dioxide, acetone, butanone and tetrahydrofuran. The preparation method is quick, effective, simple to operate, environment-friendly and suitable forlarge-scale popularization.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a polyvinylidene fluoride filter membrane and its preparation method and application. Background technique [0002] Polymer filter membrane is a kind of film made of organic high molecular polymer according to a certain process. The membrane mainly plays the role of filtration and separation. With the development of petroleum industry and science and technology, the application field of polymer filter membrane is continuously expanding. At present, the application fields include gas separation, seawater desalination, ultrapure water preparation, sewage treatment, artificial organ manufacturing, medicine, food, Agriculture, chemical industry, etc.; in addition, according to the different polymers, polymer membranes can also be divided into cellulose polymer membranes, polyamide polymer membranes, polysulfone polymer membranes, including Fluorine polymer filter membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/02B01D69/10
CPCB01D71/34B01D67/0011B01D69/02B01D69/10B01D2325/02B01D2325/24
Inventor 贾建东卢红星
Owner HANGZHOU COBETTER TECH CO LTD
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