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Preparation of polyvinyl fluoride thin film by fusion extrusion casting method

A technology of polyvinyl fluoride and melt extrusion, which is applied to flat products, other household utensils, coatings, etc. It can solve the problems of slow production speed of PVF film, easy pyrolysis of polyvinyl fluoride, and inability to melt extrusion processing, etc., to achieve The effect of wide thickness range, good transparency and short production cycle

Inactive Publication Date: 2008-04-30
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is characterized by solving the problems that polyvinyl fluoride is easy to decompose at high temperature and cannot be processed by melt extrusion, and realizes low-temperature melt casting of polyvinyl fluoride; at the same time, it avoids the slow production speed, large investment, high energy consumption, and The defect of low efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 10kg of PVF resin with a molecular weight of 320,000 to 20kg of γ-butyrolactone, and stir in a high-speed mixer at 55°C to make PVF gel. The gel is taken out and loaded into the metering feeder of the vented twin-screw extruder to melt and cast to form a film. The extrusion temperature is 125-165°C, the cooling water temperature is 15°C, and the infrared drying temperature is 175°C. The finished film has a thickness of 60 μm and a width of 600 mm.

Embodiment 2

[0023] Add 18kg of DMF to 10kg of PVF resin with a molecular weight of 440,000, stir in a high-speed mixer at 78°C to make PVF gel. The gel is taken out and loaded into the metering feeder of the twin-screw extruder to melt and cast to form a film, the extrusion temperature is 115-145°C, and the cooling water temperature is 15°C. The cooled film was stretched longitudinally (temperature: 125°C, stretch ratio: 2.5) and transversely stretched (temperature: 140°C, stretch ratio: 3), and then dried by infrared heating (temperature: 185°C) under continuous tension. ℃) film formation. The finished film has a thickness of 28 μm, a width of 1500 mm, a tensile strength of 76 MPa and a light transmittance of 94%.

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Abstract

The invention relates to a formula and technique for preparing polyvinyl fluoride thin films by using a melt-out extrusion blowing method, wherein the technique uses polyvinyl fluoride and solvent to prepare gelatins with high weight solid content at certain temperature, wherein the gelatin is melted, extruded, and flows and extends at low temperature via a screw type air-out extrusion machine, a flowing and extending melting film films via rapid cooling in the bosh, which is dried and shaped through hot-air or infra-red hot passage. The flowing and extending melting film before drying is also capable of being as a film planticle, which is dried and shaped after extending in lengthways and transverse directions. The preparing technique has the advantages that the technique employs gelatins with high weight solid content to melt and extrude out, thereby substantially reducing the processing temperature of the polyvinyl fluoride, avoiding disassembling at high temperature, besides, compared with a liquor flowing and extending filming technique, the invention has the advantages of short period of production, simple technique, energy saving, low investment for the apparatus, the thickness of the prepared flowing and extending film is capable of being adjusted randomly, and the tensile property is great, and the prepared film can be further extended in two-way to acquire a thin film product with high intensity and high modulus.

Description

technical field [0001] The invention relates to a process for preparing a polyvinyl fluoride film by a melting extrusion casting method, which belongs to the field of polymer processing. Background technique [0002] Polyvinyl Fluorite (PVF for short) is a class of polymers synthesized from derivatives in which hydrogen atoms in ethylene molecules are replaced by fluorine atoms. The repeating structural unit of its molecular formula is (-CH 2 CHF-), it has the smallest density and the least fluorine content among fluororesins, and it is also a low-cost variety among fluororesins. PVF film products have many excellent properties of fluorine materials, such as corrosion resistance, wear resistance, self-lubrication, dielectric properties, excellent ultraviolet resistance, weather resistance, etc., and are widely used in building packaging, solar cells, anti-corrosion cladding materials, etc. field. [0003] Due to the presence of hydrogen bonds between the molecular chains o...

Claims

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Application Information

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IPC IPC(8): B29C69/00B29C47/14B29C41/24B29C41/46B29C35/00B29C55/12B29K27/12B29L7/00B29C48/305
Inventor 苑会林王婧周玉生夏文广邵晶鑫赵薇
Owner BEIJING UNIV OF CHEM TECH
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