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A kind of preparation method of polyvinylidene fluoride piezoelectric composite film

A polyvinylidene fluoride piezoelectric and composite film technology, applied in the field of piezoelectric materials, can solve the problems of poor dispersion and low content of beta crystals, and achieve the effect of preventing agglomeration

Active Publication Date: 2022-05-17
SUZHOU GOLDEN TECH MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a preparation method of a polyvinylidene fluoride piezoelectric composite film, which is used to solve the problems of poor dispersion and low content of β-crystal when the piezoelectricity of PVDF is improved by adding nano-fillers

Method used

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  • A kind of preparation method of polyvinylidene fluoride piezoelectric composite film
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  • A kind of preparation method of polyvinylidene fluoride piezoelectric composite film

Examples

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Effect test

Embodiment 1

[0030] The preparation method of the polyvinylidene fluoride piezoelectric composite film, it comprises the steps:

[0031] 1) Preparation of carbon nanotube suspension: 80g of multi-walled carbon nanotubes, 1.5g of vinylbenzenetrimethylammonium chloride (modifier) ​​and 2g of sodium dodecylbenzenesulfonate (surfactant) were added to Mix in 1L of water to form a stable suspension of carbon nanotubes;

[0032] 2) PVDF suspension polymerization: add 600g VDF monomer, 0.5g diethyl peroxydicarbonate (initiator), 0.5g polyethylene glycol (dispersant), 4g ethyl acetate (chain transfer agent) and 2L water Carry out free radical suspension polymerization in a 5L polymerization reactor, heat to 60-80°C, and after 12 hours of polymerization, slowly add 100g of the carbon nanotube suspension prepared in step 1) into the polymerization reactor through a feed pump, The flow rate is controlled at 10ml / min. After the pressure is reduced to 0.1-0.3MPa, a terminator is added to discharge the ...

Embodiment 2

[0036] The preparation method of the polyvinylidene fluoride piezoelectric composite film, it comprises the steps:

[0037] 1) Preparation of carbon nanotube suspension: 120 g of multi-walled carbon nanotubes, 2 g of vinylbenzenetrimethylammonium chloride (modifier) ​​and 2 g of sodium dodecylbenzenesulfonate (surfactant) were added to 1 L Mix in water to form a stable suspension of carbon nanotubes;

[0038] 2) PVDF suspension polymerization: 400g VDF monomer, 2g cyclohexyl peroxydicarbonate (initiator), 0.2g methyl cellulose ether (dispersant), 2g diethyl carbonate (chain transfer agent) and 2L water Put it into a 5L polymerization reactor for free radical suspension polymerization, heat to 60-80°C, and after 8 hours of polymerization, slowly add 50g of the carbon nanotube suspension prepared in step 1) into the polymerization reactor through a feed pump , the flow rate is controlled at 10ml / min, after the pressure is reduced to 0.1-0.3MPa, a terminator is added to discharg...

Embodiment 3

[0042] The preparation method of the polyvinylidene fluoride piezoelectric composite film, it comprises the steps:

[0043] 1) Preparation of carbon nanotube suspension: 100 g of multi-walled carbon nanotubes, 1 g of vinylbenzenetrimethylammonium chloride (modifier) ​​and 2 g of sodium dodecylbenzenesulfonate (surfactant) were added to 1 L Mix in water to form a stable suspension of carbon nanotubes;

[0044] 2) PVDF suspension polymerization: 800g VDF monomer, 3.5g diisopropyl peroxydicarbonate (initiator), 0.8g hydroxyethyl cellulose ether (dispersant), 6g diethyl carbonate (chain transfer agent) Add 2L of water into a 5L polymerization reactor for free radical suspension polymerization, heat to 60-80°C, and after 14 hours of polymerization, slowly add 200g of the carbon nanotube suspension prepared in step 1) to the polymerization via a feed pump In the reaction kettle, the flow rate is controlled at 15ml / min. After the pressure is reduced to 0.1-0.3MPa, a terminator is ad...

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Abstract

The invention belongs to the technical field of piezoelectric materials, and in particular relates to a preparation method of a polyvinylidene fluoride piezoelectric composite film. It comprises the following steps: preparing carbon nanotube suspension, PVDF suspension polymerization, stretching into film and cooling and winding. In the technical solution provided by the invention, carbon nanotube suspension is added in the process of preparing PVDF by suspension polymerization, which effectively prevents the problem of agglomeration of nanoparticles and ensures that they can repeatedly play the role of crystallization nuclei in PVDF, thereby preparing a product with a high content of β crystals. High PVDF compression, and then by controlling the subsequent film-forming process, the conversion of β-crystal to α-crystal in the film-forming process is prevented, and finally a PVDF piezoelectric film with high β-crystal content is obtained.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric materials, and in particular relates to a preparation method of a polyvinylidene fluoride piezoelectric composite film. Background technique [0002] Piezoelectric materials are divided into piezoelectric single crystals, piezoelectric ceramics, piezoelectric polymers and piezoelectric composites according to their properties and compositions. Piezoelectric composites include polymer / nanoparticle composites and PZT / polymer composites. The polymer / nanoparticle composite dry material is to add nanoparticles to the piezoelectric polymer to enhance its piezoelectric performance while maintaining its flexibility and light weight. [0003] PVDF (polyvinylidene fluoride) is a semi-crystalline polymer compound. During the polymerization process, when the VDF (vinylidene fluoride) monomer expands into molecular chains, the C atoms link to form the main carbon chain, while the H and F atoms rotate a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/22C08F2/20C08F2/44C08K9/04C08K3/04C08J5/18B29D7/01B06B1/06
CPCY02P20/10
Inventor 唐超李华迟庆国张天栋冯宇张昌海
Owner SUZHOU GOLDEN TECH MATERIAL
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