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Film and method for producing same

A manufacturing method and polymer film technology, which can be used in the manufacture/assembly of flat products, piezoelectric/electrostrictive devices, and other household appliances, can solve the problems of reduced electrical insulation and reduced voltage resistance, and achieve excellent The effect of voltage resistance

Active Publication Date: 2016-06-15
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As a result of studying the above-mentioned production method, the inventors of the present invention have found that if the above-mentioned solution is not filtered, there is a problem that the electrical insulation of the membrane is lowered, and thus the withstand voltage of the membrane is lowered.

Method used

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  • Film and method for producing same
  • Film and method for producing same
  • Film and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0125] Process A (preparation process of liquid composition)

[0126] In step A, a liquid composition (paint) containing a vinylidene fluoride polymer and a solvent is prepared. For example, a vinylidene fluoride polymer and desired components (for example, polymers other than the above polymers, inorganic oxide particles, and affinity enhancer) are dissolved or dispersed in a solvent to prepare a liquid composition.

[0127] The dissolution temperature at the time of preparation of the liquid composition is not particularly limited, but it is preferable to increase the dissolution temperature because dissolution can be accelerated. However, if the dissolution temperature is too high, the obtained film tends to be colored, so the dissolution temperature is preferably room temperature or higher and 80° C. or lower.

[0128] In addition, in the sense of preventing such coloring, preferable examples of the above-mentioned solvents include ketone-based solvents (for example, me...

Embodiment 1

[0228] Example 1 (Example as Piezoelectric Film)

[0229] (1) Dissolve vinylidene fluoride / tetrafluoroethylene copolymer (TFE / VDF=20 / 80) in methyl ethyl ketone (MEK) to prepare a coating with a solid content of 25 wt%, and then use the coating with a pore size of 3 μm A deep pleated filter (ROKITECHNO Co., Ltd. DIAII series) was used to obtain a filtrate.

[0230] (2) Next, apply the above-mentioned filtrate on the PET film with a die coater, and further dry it, so that a vinylidene fluoride / tetrafluoroethylene copolymer film (film thickness of the copolymer film: 25 μm) is produced on the PET film. ). At this time, the above-mentioned drying is carried out as follows: in a drying oven with the drying temperatures of 4 zones (2m per zone) set to 50°C / 80°C / 120°C / 150°C, respectively, at a peripheral speed of 8m / min conduct.

[0231] (3) Next, the above-mentioned copolymer film is peeled off from the PET film, and the above-mentioned copolymer film is sandwiched from the upp...

Embodiment 2

[0255] Example 2 (Example as film for film capacitor)

[0256] (1) 90 parts by mass of a vinylidene fluoride / tetrafluoroethylene copolymer (TFE / VDF=7 / 93) and 10 parts by mass of carboxybutyl cellulose were mixed.

[0257] (2) Next, with respect to a mixed solvent of N-methylpyrrolidone (NMP) and methyl ethyl ketone (MEK) (NMP:MEK=3:7 (mass ratio)), the solid content is 20 wt%. The above-mentioned copolymer and carboxybutyl cellulose were dissolved, thereby preparing a dope.

[0258] (3) Next, the above-mentioned paint was filtered with a deep pleated filter (ROKITECHNO Co., Ltd. DIAII series) with a pore diameter of 3 μm to obtain a filtrate.

[0259] (4) Next, apply the above-mentioned filtrate on the PET film with a die coater, and further dry it, thereby producing a film capacitor film (film film) containing a vinylidene fluoride / tetrafluoroethylene copolymer on the PET film. Thickness: 3 μm). At this time, the above-mentioned drying is carried out at a peripheral spee...

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Abstract

The primary problem addressed by the present invention is to provide a film exhibiting high electrical insulation properties and exhibiting superior voltage resistance, and a method for producing the film. As a means of solving the problem, the present invention provides a fluorinated vinylidene polymer film of which the 99% voltage failure resistance value in a Weibull plot is at least 300 V / mum.

Description

technical field [0001] The present invention relates to a film and its manufacturing method. Background technique [0002] Conventionally, various organic dielectric films and inorganic dielectric films are known as piezoelectric films, thin films or films for electrowetting applications, and film capacitor applications. [0003] Among them, the polarized vinylidene fluoride polymer film has the advantages of being transparent and flexible unlike inorganic dielectric thin films, and thus can be applied to various applications. [0004] For example, Patent Document 1 and Patent Document 2 disclose techniques for imparting a contact pressure detection function to a touch panel using a polarized vinylidene fluoride polymer film. [0005] prior art literature [0006] patent documents [0007] Patent Document 1: Japanese Patent Laid-Open No. 2010-26938 [0008] Patent Document 2: Japanese Patent Laid-Open No. 2011-222679 Contents of the invention [0009] The problem to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C41/12C08J7/00B29K27/12B29L7/00H10N30/857C08J7/04H10N30/098
CPCC08J2327/16Y02P20/582C08J5/18C08J7/04H10N30/857H10N30/098C08J7/06C08L27/16H01G4/33H01G4/14H01G4/306
Inventor 高明天金村崇向井惠吏小谷哲浩
Owner DAIKIN IND LTD
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