Polyvinylidene fluoride microporous film prepared through gelatin extrusion tape casting method

A polyvinylidene fluoride, extrusion casting technology, used in flat products, other household appliances, coatings, etc., can solve the problems of large solvent volatilization and low solid content, and achieve low solvent consumption and high solid content. , the effect of saving energy

Inactive Publication Date: 2012-08-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The above-mentioned methods for preparing PVDF microporous membranes

Method used

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  • Polyvinylidene fluoride microporous film prepared through gelatin extrusion tape casting method
  • Polyvinylidene fluoride microporous film prepared through gelatin extrusion tape casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 2kg of N,N-dimethylacetamide (DMAC) into 10kg of PVDF, and stir at room temperature to form a uniform gel. Then the gel is added to the metering feeder (1) of the extruder, plasticized and melted in the screw extruder (2) at 200-215°C, and extruded through the die (3) at 80°C The film is cast on the steel belt (5) rotating at a uniform speed, and the steel belt speed is 3 revolutions / minute. After the continuously heated steel strip is dried, it is wound up by a winder (9) to form a film, and finally the finished microporous film is obtained. The thickness of the film is 20 μm, the thickness tolerance in the vertical and horizontal directions is less than 0.5 μm, the pore size of the micropore is 2-5 μm, the porosity is 43%, and the water flux under the pressure of 0.1MPa is 180L / m2·h.

Embodiment 2

[0034] Add 2kg of N,N-dimethylformamide (DMF) into 10kg of PVDF, and stir at room temperature to form a uniform gel. Then the gel is added to the metering feeder (1) of the extruder, plasticized and melted in the screw extruder (2) at 200-215°C, and extruded through the die (3) at 70°C The film is cast on the steel belt (5) rotating at a uniform speed, and the steel belt speed is 3 revolutions / minute. After the continuously heated steel strip is dried, it is wound up by a winder (9) to form a film, and finally the finished microporous film is obtained. The thickness of the film is 20 μm, the thickness tolerance in the vertical and horizontal directions is less than 0.5 μm, the pore diameter of the micropore is 2-5 μm, the porosity is 40%, and the water flux under the pressure of 0.1MPa is 175L / m2 h.

Embodiment 3

[0036] Add 2kg of N-methylpyrrolidone (NMP) into 10kg of PVDF, and stir at room temperature to form a uniform gel. Then add the gel into the metering feeder (1) of the extruder, plasticize and melt extrude in the screw extruder (2) at 200-215°C, pass through the die (3) at 100°C The film is cast on the steel belt (5) rotating at a uniform speed, and the steel belt speed is 3 revolutions / minute. After the continuously heated steel strip is dried, it is wound up by a winder (9) to form a film, and finally the finished microporous film is obtained. The thickness of the film is 20 μm, the thickness tolerance in the longitudinal and transverse directions is less than 0.5 μm, the micropore diameter is 2-5 μm, the porosity is 50%, and the water flux under the pressure of 0.1 MPa is 195 L / m2 h.

5. Description of drawings

[0037] The accompanying drawing of the description is a process flow chart of preparing polyvinylidene fluoride microporous membrane by gel extrusion casting met...

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Abstract

The invention relates to a process for preparing a polyvinylidene fluoride microporous film through a gelatin extrusion tape casting method. The process is as follows: polyvinylidene fluoride resin and a certain amount of solvent are mixed into gelatin and then are added into an extruder for smelting and extrusion through a feeding machine, and pass through the neck ring mold of a mold and form the film on a continuous heating and uniformly rotating roller or a steel strip, then the film is wound by a winding machine after drying, and eventually, the finished product of the microporous film is obtained. The steel strip is heated by a blaster, and air enters into an air inlet for heating and then passes through a casting machine, and then is discharged through an air outlet. The invention is characterized in that the solid content of gelinite added into the extruder is high, the volatilization quantity of the solvent is less, pollutions to air are less, besides, forming, drying and shaping can be performed at the same time during a thin film preparation process, the film forming rate is high, and the efficiency is high; the film preparing process is simple and flexible; and the film flatness is excellent, the thickness is uniform and adjustable, and the mechanical property is high.

Description

1. Technical field [0001] The invention relates to a process for preparing a polyvinylidene fluoride microporous membrane by a gel extrusion casting method, and belongs to the field of polymer processing. 2. Background technology [0002] Polyvinylidene fluoride (PVDF) is a fluorocarbon thermoplastic resin with excellent performance, which has outstanding solvent resistance, acid and alkali resistance, oxidation resistance, weather resistance and chemical stability. The PVDF film will not be brittle or cracked after being placed outdoors for one or twenty years, and its performance will basically remain unchanged after being irradiated with an ultraviolet lamp with a wavelength of 20-400nm for one year. PVDF can only be dissolved or partially dissolved in a few solvents such as oleum, strong alkali and dimethylformamide (DMF), and is not corroded by acids, alkalis, strong oxidants and halogens at room temperature. The difference between the melting point (about 170°C) and t...

Claims

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Application Information

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IPC IPC(8): B29C69/02B29C47/92B29C41/24B29K27/12B29L7/00B29C48/92
Inventor 苑会林杨晋娜邹本飞
Owner BEIJING UNIV OF CHEM TECH
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