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Preparation method of 100% gamma phase PVDF (polyvinylidene fluoride) film

A thin film, illite technology, applied in the field of materials, can solve the problems of slow crystal growth rate, harsh conditions, unfavorable promotion and application, etc., and achieve the effect of fast crystallization rate and high efficiency

Active Publication Date: 2019-04-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current methods for preparing polyvinylidene fluoride materials with 100% γ phase are either under harsh conditions, the crystal growth rate is slow, or the cost is too high, which is not conducive to popularization and application.

Method used

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  • Preparation method of 100% gamma phase PVDF (polyvinylidene fluoride) film
  • Preparation method of 100% gamma phase PVDF (polyvinylidene fluoride) film
  • Preparation method of 100% gamma phase PVDF (polyvinylidene fluoride) film

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preparation example Construction

[0046] 1. Preparation method of organically modified illite

[0047] First, the illite is subjected to ultrasonic treatment, and then placed on an electromagnetic stirrer at a certain temperature to stir, and then a dilute hydrochloric acid solution and a certain mass fraction of cationic surfactant are slowly added, stirred for a certain period of time, and left to activate to complete the reaction. The suspension is vacuum-filtered. During the suction-filtration process, the unreacted ions are removed by alternating washing with deionized water and absolute ethanol several times, dried in a vacuum oven, and the modified silicate clay is ground, sieved, and bottled. The organically modified illite prepared by the present invention preferably has a stirring temperature of 60-100° C., and the preferred cationic surfactant is hexadecyltrimethylammonium bromide, octadecyltrimethylammonium bromide, didecyltrimethylammonium bromide, and didecyltrimethylammonium bromide. Dialkyldime...

Embodiment 1

[0054] The first step is to prepare modified illite with cetyltrimethylammonium bromide (CTAB). Add 10 g of illite to 150 mL of deionized water, sonicate for 2 h, and then stir on an 80° C. in the liquid. The mixed solution was electromagnetically stirred at 80° C. for 2 h, and left standing for 24 h to fully activate the reaction. The suspension was vacuum-filtered and washed three times alternately with deionized water and absolute ethanol to ensure the removal of CTAB free on the illite surface. Then it was dried in a vacuum oven at 70°C for 24 hours, taken out, and the dried organically modified illite was ground, sieved and bottled.

[0055] The second step is solution blending to prepare PVDF film containing 2.0wt% organic illite. Weigh 6mg of organic illite in dimethylacetamide (DMAc) in 30mL, ultrasonically disperse for 2h, weigh 294mg of PVDF pellets and add them to the conical flask, the concentration of the blended solution is 10mg / mL, and electromagnetically sti...

Embodiment 2

[0059] The first step is to prepare illite modified by octadecyltrimethylammonium bromide (STAB). Add 10g of illite to 150mL of deionized water, sonicate for 2h, and then stir on a 60°C electromagnetic stirrer. During the stirring process, slowly add 4mL (0.1mol / L) dilute hydrochloric acid solution and 3wt% CTAB to the clay suspension in the liquid. The mixed solution was electromagnetically stirred at 60° C. for 2 h, and left standing for 24 h to fully activate the reaction. The suspension was vacuum-filtered and washed three times alternately with deionized water and absolute ethanol to ensure the removal of STAB free on the illite surface. Then it was dried in a vacuum oven at 60°C for 24 hours, taken out, and the dried organically modified illite was ground, sieved and bottled.

[0060] The second step is solution blending to prepare PVDF film containing 0.1wt% organic illite. Weigh 0.25mg of organic illite in 50mL N,N-dimethylformamide (DMF), ultrasonically disperse fo...

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Abstract

The invention relates to a preparation method of a 100% gamma phase PVDF (polyvinylidene fluoride) film, and the method comprises the following steps: modified illite and PVDF granules are subjected to first mixing treatment, and the modified illite is obtained by carrying out surface activation treatment on illite; film-forming treatment is performed on a first mixed treatment product; drying isperformed on a film-forming treatment product; a drying treatment product is subjected to fusion treatment so as to eliminate heat history; and isothermal crystallization treatment is performed on a fused treatment product under the condition that the temperature is 158-168 DEG C so as to obtain the gamma-phase PVDF film. The method can be used for preparing a 100% gamma phase PVDF material, highin crystallization rate, high in efficiency, low in cost and suitable for large-scale popularization and application.

Description

technical field [0001] The present invention relates to the field of materials, specifically, the present invention relates to a preparation method of 100% γ-phase PVDF film, more specifically, the present invention relates to a preparation method of γ-phase PVDF film and the use of modified illite in preparing γ-phase PVDF film . Background technique [0002] Polyvinylidene fluoride (poly(vinylidene fluoride), PVDF) is a typical polymorphic polymer with five different crystal forms of α, β, γ, δ and ε. γ-crystalline PVDF has excellent piezoelectricity, pyroelectricity and ferroelectricity due to its special molecular conformation. As a new smart material, polymers with electrical properties can be applied to sensors, actuators, energy harvesting Devices and other smart materials. However, the current methods for preparing 100% γ-phase polyvinylidene fluoride materials have harsh conditions, slow crystal growth rate, or high cost, which is not conducive to popularization a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L27/16C08K9/02C08K9/04C08K3/34
CPCC08J5/18C08K9/02C08K9/04C08K3/34C08J2327/16
Inventor 闫寿科宋甜甜孙晓丽李慧慧
Owner BEIJING UNIV OF CHEM TECH
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