Method for preparing polyvinylidene fluoride polarizable film

A technology of polyvinylidene fluoride and film, which is applied in the field of preparation of polarized polyvinylidene fluoride film, can solve problems such as unsuitable for industrial production, polyvinylidene fluoride copolymer is not good, etc., and achieve film thickness controllability and film forming Convenient and reasonable process effect

Inactive Publication Date: 2011-07-27
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polarizable layer is generally prepared by the method of solution coating, and the thickness is between 300nm and 400nm, which cannot be satisfied by the above two mechanical methods.
Ronald C.G.Naber and Cristina Tanase et al. reported the method for preparing information storage devices from polyvinylidene fluoride copolymers in the fourth issue of NatureMaterials 2005, but the polyvinylidene fluoride copolymers used are not relatively industrial polymers and are not suitable for industrial production

Method used

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  • Method for preparing polyvinylidene fluoride polarizable film
  • Method for preparing polyvinylidene fluoride polarizable film
  • Method for preparing polyvinylidene fluoride polarizable film

Examples

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Embodiment 1

[0024] A method for preparing a polyvinylidene fluoride polarizable film, the method comprising the following steps:

[0025] (1) Montmorillonite (cation exchange capacity 85mequiv·100g -1 ) was dispersed in deionized water, stirred at 70°C for 4 hours to obtain a montmorillonite suspension with a concentration equal to 2wt%, and set aside;

[0026] (2) dissolving polyvinylidene fluoride (PVDF) in N,N-dimethylformamide to make a solution with a concentration equal to 5wt% polyvinylidene fluoride;

[0027] (3) Mix the above polyvinylidene fluoride solution and montmorillonite suspension according to the mass ratio (100:0; 97.5:2.5; 95:5; 88.4:11.6; 78:22; 61.5:38.5) Polyvinylidene fluoride polarizable film was prepared by pouring and volatile solvent at 120°C. The content of montmorillonite in the film was 0wt%, 1wt%, 2wt%, 5wt%, 10wt% and 20wt%, and the thickness of the film was 0.01mm .

[0028] Cut the 0.01mm thick film obtained above into 1×1cm 2 Size, its voltage capac...

Embodiment 2

[0030] A method for preparing a polyvinylidene fluoride polarizable film, the method comprising the following steps:

[0031] (1) The original soil of montmorillonite (cation exchange capacity 100mequiv·100g -1 ) was dispersed in deionized water, stirred at 70°C for 4 hours to obtain a montmorillonite suspension with a concentration equal to 4wt%, and set aside;

[0032] (2) dissolving industrial grade polyvinylidene fluoride (PVDF) in industrial grade N,N-dimethylacetamide to make a solution with a concentration equal to 10wt% polyvinylidene fluoride;

[0033] (3) Mix the above polyvinylidene fluoride solution and montmorillonite suspension according to the mass ratio (100:0; 97.5:2.5; 95:5; 88.4:11.6; 78:22; 61.5:38.5) Polyvinylidene fluoride polarizable film was prepared by pouring and volatile solvent at 120°C. The content of montmorillonite in the film was 0wt%, 1wt%, 2wt%, 5wt%, 10wt% and 20wt%, and the thickness of the film was 0.01mm .

Embodiment 3

[0035] A method for preparing a polyvinylidene fluoride polarizable film, the method comprising the following steps:

[0036] (1) The original soil of montmorillonite (cation exchange capacity 120mequiv·100g -1 ) was dispersed in deionized water, stirred at 50°C for 6 hours to obtain a montmorillonite suspension with a concentration equal to 5wt%, and set aside;

[0037] (2) dissolving industrial grade polyvinylidene fluoride (PVDF) in chemically pure N,N-dimethylformamide to make a concentration equal to 20wt% polyvinylidene fluoride solution;

[0038] (3) Mix the above polyvinylidene fluoride solution and montmorillonite suspension evenly at a mass ratio of 17:12, pour and volatilize the solvent at a temperature of 100°C to prepare a polyvinylidene fluoride polarizable film, in which the montmorillonite The soil content was 15 wt%, and the film thickness was 0.01 mm.

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Abstract

The invention relates to a method for preparing a polyvinylidene fluoride polarizable film. The method comprises the following steps: (1) dispersing montmorillonoid into deionized water, and stirring the mixture for 2 to 6 hours at the temperature of between 50 and 90 DEG C to obtain montmorillonoid suspension for standby; (2) dissolving polyvinylidene fluoride (PVDF) into a solvent to form polyvinylidene fluoride solution; and (3) mixing the montmorillonoid suspension and the polyvinylidene fluoride solution evenly, and pouring and volatilizing the solvent at the temperature of lower than 150 DEG C to obtain the polyvinylidene fluoride polarizable film, wherein the content of the montmorillonoid in the film is 0.01 to 10 percent by weight. Compared with the prior art, the method has reasonable process and simple operation, can use a solution mixing method to mix and pour the polyvinylidene fluoride and the montmorillonoid to form the polyvinylidene fluoride polarizable film, has the advantages of film forming convenience, film thickness adjustment and the like, and is suitable for industrialized production; and meanwhile, the film can be polarized, and can be widely applied in the industries of piezoelectric materials, information storage devices and the like.

Description

technical field [0001] The invention relates to a polarizable film, in particular to a preparation method of a polyvinylidene fluoride polarizable film. Background technique [0002] The polyvinylidene fluoride polarizable film is mainly composed of polyvinylidene fluoride β crystal form, which can be polarized under an electric field, and is an ideal material for preparing piezoelectric materials and information storage devices. Polyvinylidene fluoride piezoelectric film is an important sensor material that has a wide range of applications in military and civilian fields because it can generate electrical signals to applied stress. [0003] At present, the β-crystalline polyvinylidene fluoride polarizable film is mainly prepared by stretching method, Naohiro Murayama; Takao Oikawa et al first described it in the US patent US3878274 entitled "Polyvinylidene fluoride resin film processing process" However, the preparation method of this piezoelectric film cannot achieve high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L27/16C08K3/34
Inventor 吴同飞杨桂生
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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