Method for preparing nano-composite polyvinylidene fluoride hollow fiber membrane by three-layer co-extrusion and co-extrusion equipment

A technology of polyvinylidene fluoride and polyvinylidene fluoride resin, which is applied in the field of three-layer co-extrusion to prepare nanocomposite polyvinylidene fluoride hollow fiber membranes, which can solve the problems of stability, poor modification effect and complicated modification process, etc. problem, to achieve the best modification effect, not easy to fall off, and good stability

Inactive Publication Date: 2021-04-02
杭州高通膜技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modification of nanomaterials is one of the current research hotspots. It has high activity and selectivity, stable chemical properties, hydrophilicity and corrosion resistance, non-toxicity, and low cost. However, the modification process is complicated and the stability , poor modification effect and other defects

Method used

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  • Method for preparing nano-composite polyvinylidene fluoride hollow fiber membrane by three-layer co-extrusion and co-extrusion equipment
  • Method for preparing nano-composite polyvinylidene fluoride hollow fiber membrane by three-layer co-extrusion and co-extrusion equipment
  • Method for preparing nano-composite polyvinylidene fluoride hollow fiber membrane by three-layer co-extrusion and co-extrusion equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]1) At 30°C, dissolve polyvinylidene fluoride resin with a mass fraction of 15wt% and additives with a mass fraction of 5wt% in a solvent or diluent with a mass fraction of 80wt%, and then defoam to obtain a polyvinylidene fluoride casting solution; The polyvinylidene fluoride resin is polyvinylidene fluoride powder with a weight average molecular weight of 300,000. The additives are polyethylene glycol with a molecular weight of 200-20,000, polyvinylpyrrolidone with a molecular weight of 10,000-100,000, polyoxyethylene-polyoxypropylene-polyoxyethylene with a molecular weight of 1000-16,000, nonylphenol polyoxyethylene ether, glycerin, One or more mixtures of sorbitan laurate. The solvent or diluent is N,N-dimethylacetamide, N,N-dimethylformamide, N-methylpyrrolidone, dimethyl sulfoxide, triethyl phosphate, diphenyl carbonate, Propylene carbonate, dimethyl terephthalate, diethyl terephthalate, dibutyl terephthalate, dioctyl terephthalate, glyceryl triacetate, benzophenon...

Embodiment 2

[0031] 1) At 100°C, dissolve polyvinylidene fluoride resin with a mass fraction of 20wt% and additives with a mass fraction of 8wt% in a solvent or diluent with a mass fraction of 72wt%, and then defoam to obtain a polyvinylidene fluoride casting solution ; The polyvinylidene fluoride resin is a polyvinylidene fluoride powder with a weight average molecular weight of 400,000.

[0032] 2) A nano-functional material solution was prepared by uniformly dispersing nano-silica with a mass fraction of 1 wt% in a polyvinylidene fluoride solution with a mass fraction of 1 wt%.

[0033] 4) The polyvinylidene fluoride hollow fiber membrane embryo body is immersed in a coagulation bath at a temperature of -5°C to undergo phase inversion.

[0034] Other steps are the same as in Example 1.

Embodiment 3

[0036] 1) At 150°C, dissolve polyvinylidene fluoride resin with a mass fraction of 20wt% and additives with a mass fraction of 10wt% in a solvent or diluent with a mass fraction of 70wt%, and then defoam to obtain a polyvinylidene fluoride casting solution; The polyvinylidene fluoride resin is polyvinylidene fluoride pellets with a weight average molecular weight of 500,000. The additive is a mixture of polyethylene glycol with a molecular weight of 2000 and polyvinylpyrrolidone with a molecular weight of 30000, and the solvent or diluent is a mixture of N-methylpyrrolidone, dioctyl terephthalate and tributyl citrate.

[0037] 2) Uniformly disperse nano titanium dioxide with a mass fraction of 8wt% in a polyvinylidene fluoride solution with a mass fraction of 2wt% to prepare a nano functional material solution; the polyvinylidene fluoride solution is a dilute solution composed of a solvent and polyvinylidene fluoride Solution, the polyvinylidene fluoride resin used has a weigh...

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Abstract

The invention discloses a method for preparing a nano composite polyvinylidene fluoride hollow fiber membrane through three-layer co-extrusion and co-extrusion equipment, and belongs to the technicalfield of membranes. The preparation method comprises the steps of 1) putting polyvinylidene fluoride resin and an additive into a solvent or a diluent, uniformly dissolving, and defoaming to obtain apolyvinylidene fluoride membrane casting solution; 2) uniformly dispersing a nano functional material into the polyvinylidene fluoride solution to prepare a nano functional material solution; 3) performing double-layer co-extrusion on the polyvinylidene fluoride membrane casting solution and the nano functional material solution by using a three-layer channel spinning nozzle; and 4) finally, immersing a polyvinylidene fluoride hollow fiber membrane blank into a coagulating bath tank for phase inversion, and curing to form the nano composite polyvinylidene fluoride hollow fiber membrane. According to the method for preparing the nano composite polyvinylidene fluoride hollow fiber membrane through three-layer co-extrusion and the co-extrusion equipment, the modification process does not influence the flux, solute interception and other properties of the membrane, the nano-functional layer compounded on the surface is not prone to falling off, and better stability and better modificationeffect are shown.

Description

technical field [0001] The invention belongs to the field of membrane technology, and specifically relates to a method for preparing a nanocomposite polyvinylidene fluoride hollow fiber membrane by three-layer co-extrusion and co-extrusion equipment thereof. Background technique [0002] Polyvinylidene fluoride PVDF is a membrane material with excellent performance, which has hydrophobicity, heat resistance, chemical stability, radiation resistance and good physical and mechanical properties, and general organic solvents have no effect on it. Polyvinylidene fluoride membrane can be used in separation, concentration, purification of biological products, pharmaceutical products and food industry, and can also be used in blood treatment, wastewater treatment and ultrapure water preparation. Although polyvinylidene fluoride membrane has high-efficiency separation performance, polyvinylidene fluoride has low surface energy, strong hydrophobicity, low hydrophilicity and anti-pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00
CPCB01D67/0011B01D69/085B01D69/088B01D2325/30
Inventor 朱利平方传杰周哲松周联友周志勤
Owner 杭州高通膜技术有限公司
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