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Preparation of polyvinyl fluoride thin film by solution casting method

The technology of polyvinyl fluoride and polyvinyl fluoride resin is applied in the field of preparing polyvinyl fluoride film by solution casting method, which can solve the problems of long growth cycle, low production efficiency and high energy consumption, and achieve high film forming rate and low equipment investment. , the effect of saving energy

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

AI Technical Summary

Problems solved by technology

The process of this method is simple and easy to implement; but the growth cycle is long, energy consumption is high, and production efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 10kg of PVF resin with a molecular weight of 180,000 into 30kg of γ-butyrolactone, and dissolve completely at 150°C under the action of stirring. The homogeneously dissolved solution was filtered and defoamed for 2 hours, then the solution was poured into the metering feeder of the extruder, and cast on a steel belt rotating at a constant speed at a temperature of 160°C through a slit die to form a film. The thickness of the film is 18 μm, and the thickness tolerance in the longitudinal and transverse directions is less than 0.5 μm.

Embodiment 2

[0022] Add 10kg of PVF resin with a molecular weight of 460,000 to 45kg of γ-butyrolactone, and dissolve completely at 170°C under the action of stirring. The uniformly dissolved solution was filtered and defoamed for 5 hours, then the solution was poured into the metering feeder of the extruder, and cast on a uniformly rotating roller at a temperature of 180°C to form a film through a slit head. The diameter of the roller is 1.2 m, and the rotational speed is 2 revolutions / minute. The thickness of the film was 30 μm. The thickness tolerances in the longitudinal and transverse directions are both less than 0.5 μm.

Embodiment 3

[0024] Add 10kg of PVF resin with a molecular weight of 320,000 into 40kg of γ-butyrolactone, and dissolve completely at 155°C under the action of stirring. Filter the uniformly dissolved solution and pour it into a spacious solution tank for degassing for 3 hours, then use a roller that rotates continuously at a uniform speed to dip into the solution to form a film. The temperature of the roller is 170°C and the rotation speed is 10 rpm The thickness of the film is 19 μm, and the thickness tolerances in the longitudinal and transverse directions are both less than 0.5 μm.

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Abstract

The invention relates to a formula and technique for preparing polyvinyl fluoride thin film by using liquor flowing and extending method, wherein the technique comprises dissolving the polyvinyl fluoride in a strong polar solvent to be a dilute solution which is used as primary liquid for preparing films, then flowing and extending the primary liquid for preparing films from the machine gap after filtering and de-aerating, or coating the primary liquid on a dry roller which is continuously heated and rotates in uniform speed or on a steel belt via a roll-type coater, to form film, or using the roller which is continuously heated and rotates in uniform speed, to dip in the liquor for forming film, finally releasing film rapidly after evaporation of the solvent. The forming, drying and shaping are simultaneously carried through in the process of film preparation, the rate of filming is high, and the efficiency is high, the filming apparatuses which are fit for filming are many, the filming technique is simple and flexible, the thin film has good setting-out level and flat degree, homogeneous thickness and high extending degree.

Description

technical field [0001] The invention relates to a process for preparing a polyvinyl fluoride film by a solution casting method, which belongs to the field of polymer processing. Background technique [0002] Polyvinyl fluoride film has good electrical insulation, optical and anti-adhesion properties, non-flammability and durability, excellent resistance to sunlight, solvents, acids and alkalis, moisture and oxidation, and is suitable for any harsh climate and environment. Excellent mechanical properties and ductility, and can maintain toughness and flexibility in a wide temperature range. These excellent characteristics ensure that PVF films have broad application prospects in a series of important technologies, and occupy a unique and very important position in film materials. However, the production of PVF films has not been fully developed. This is because the decomposition temperature of polyvinyl fluoride resin is low, and the melting temperature is close to the decom...

Claims

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Application Information

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IPC IPC(8): B29C69/00B29C47/14B29C41/24B29C41/26B29C41/46B29C41/34B29C37/00B29K27/12B29L7/00B29C48/305
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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