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Preparation method for crosslinkable high voltage-resistant high-energy density polyvinylidene fluoride (PVDF) plastic film

A polyvinylidene fluoride and plastic film technology, which is applied in the field of preparation of cross-linkable, high-voltage, high-energy-storage polyvinylidene fluoride plastic films, can solve problems such as difficulty in film drawing at low temperature, and achieves simple and controllable methods and low cost. Low, human and environmental friendly effects

Active Publication Date: 2013-11-13
无锡鑫聚电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of existing film drawing technology, the object of the present invention is to provide a kind of preparation method of polyvinylidene fluoride plastic film that can cross-link high-voltage resistance and high energy storage by P(VDF-CTFE), cross-linking can improve film High tensile strength, which is conducive to stretching and solves the problem of difficult low-temperature stretching of fluoropolymer films; at the same time, cross-linking is also conducive to the microcrystallization of film materials, which helps to improve the breakdown field strength

Method used

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  • Preparation method for crosslinkable high voltage-resistant high-energy density polyvinylidene fluoride (PVDF) plastic film
  • Preparation method for crosslinkable high voltage-resistant high-energy density polyvinylidene fluoride (PVDF) plastic film
  • Preparation method for crosslinkable high voltage-resistant high-energy density polyvinylidene fluoride (PVDF) plastic film

Examples

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Embodiment 1

[0022] This embodiment includes the following steps:

[0023] Step 1. Add poly(vinylidene fluoride-chlorotrifluoroethylene) P(VDF-CTFE) into the three-necked flask, the molar composition is VDF / CTFE=80:20, and add solvent at the same time, poly(vinylidene fluoride-trifluoroethylene) The mass ratio of chlorofluoroethylene) P(VDF-CTFE) to solvent is 3:100. After the poly(vinylidene fluoride-trifluorochloroethylene)P(VDF-CTFE) is fully dissolved, add the catalyst, and the catalyst and poly(vinylidene fluoride) Cl atom molar ratio is 1:1 in vinyl fluoride-trifluorochloroethylene) P (VDF-CTFE), and continues stirring reaction at 50 ℃ for 24 hours;

[0024] The solvent is N-methylpyrrolidone;

[0025] Described catalyzer is triethylamine;

[0026]Step 2, pour the solution finally obtained in step 1 into a beaker filled with hydrochloric acid of PH=3, the volume ratio of hydrochloric acid to the solution obtained in step 1 is 5:1, after stirring for 1 hour, the polymer is precipita...

Embodiment 2

[0033] This embodiment includes the following steps:

[0034] Step 1. Add poly(vinylidene fluoride-chlorotrifluoroethylene) P(VDF-CTFE) into the three-necked flask, the molar composition is VDF / CTFE=80:20, and add solvent at the same time, poly(vinylidene fluoride-trifluoroethylene) The mass ratio of chlorofluoroethylene) P(VDF-CTFE) to solvent is 3:100. After the poly(vinylidene fluoride-trifluorochloroethylene)P(VDF-CTFE) is fully dissolved, add the catalyst, and the catalyst and poly(vinylidene fluoride) Cl atom molar ratio is 1:1 in vinyl fluoride-trifluorochloroethylene) P (VDF-CTFE), and continues stirring reaction at 50 ℃ for 24 hours;

[0035] The solvent is N-methylpyrrolidone;

[0036] Described catalyzer is triethylamine;

[0037] Step 2, pour the solution finally obtained in step 1 into a beaker filled with hydrochloric acid of PH=3, the volume ratio of hydrochloric acid to the solution obtained in step 1 is 6:1, after stirring for 1 hour, the polymer is precipit...

Embodiment 3

[0043] This embodiment includes the following steps:

[0044] Step 1. Add poly(vinylidene fluoride-chlorotrifluoroethylene) P(VDF-CTFE) into the three-necked flask, the molar composition is VDF / CTFE=80:20, and add solvent at the same time, poly(vinylidene fluoride-trifluoroethylene) The mass ratio of chlorofluoroethylene) P(VDF-CTFE) to solvent is 3:100. After the poly(vinylidene fluoride-trifluorochloroethylene)P(VDF-CTFE) is fully dissolved, add the catalyst, and the catalyst and poly(vinylidene fluoride) Cl atom molar ratio is 1:1 in vinyl fluoride-trifluorochloroethylene) P (VDF-CTFE), and continues stirring reaction at 50 ℃ for 24 hours;

[0045] The solvent is N-methylpyrrolidone;

[0046] Described catalyzer is triethylamine;

[0047] Step 2, pour the solution finally obtained in step 1 into a beaker filled with hydrochloric acid of PH=3, the volume ratio of hydrochloric acid to the solution obtained in step 1 is 4:1, after stirring for 1 hour, the polymer is precipit...

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Abstract

The invention provides a preparation method for a crosslinkable high voltage-resistant high-energy density PVDF plastic film. The preparation method comprises the following steps: step 1, adding P(VDF-CTFE) into a boiling flask with three necks, simultaneously adding a solvent and a catalyst and carrying out stirring for a reaction; step 2, dumping a solution finally obtained in the step 1 into a hydrochloric acid beaker and allowing a polymer to be precipitated; step 3, dissolving the polymer obtained in the step 2 in N,N-dimethyl formamide (DMF), adding the radical initiator benzoyl peroxide (BPO) and curing a glass flake on which a polymer film is attached in a baking oven after complete volatilization of the solvent so as to obtain a crosslinked polymer film; and step 4, preparing a dumbbell-like sample from the crosslinked polymer film obtained in the step 3, drawing the sample on a universal testing machine so as to obtain the high voltage-resistant PVDF plastic film. The method provided by the invention overcomes the problem of difficult drawing of a fluorine polymer at a low temperature; moreover, crosslinking is favorable for microcrystallization of a thin film material, which facilitates improvement of breakdown field strength.

Description

technical field [0001] The invention relates to a new method for dehydrochlorination reaction of fluorine-containing polymers, in particular to a cross-linkable, high-voltage, high-energy-storage poly(vinylidene fluoride) prepared from poly(vinylidene fluoride-chlorotrifluoroethylene) P(VDF-CTFE). The preparation method of vinyl fluoride plastic film. Background technique [0002] Polyvinylidene fluoride (PVDF) and its copolymer with trifluoroethylene (P(VDF-TrFE)) have attracted extensive attention due to their superior piezoelectric, ferroelectric, and dielectric properties, and are used in electrical Insulation, microelectronic devices, sensors and other fields. However, P(VDF-TrFE), as a typical ferroelectric polymer, has very high remnant polarization, which results in only a small part of its stored energy being released. In order to realize the application of such materials in energy storage capacitors, in 1998, Professor QM Zhang of Pennsylvania State University us...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J3/24C08L27/16C08L27/12
Inventor 张志成谭少博
Owner 无锡鑫聚电子科技有限公司
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