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Copolymer-sylvite composite film material and its preparation method

A technology of a copolymer and a composite membrane, which is applied in the field of composite membrane materials and their preparation, achieves the effects of simple and easy preparation process, convenient for large-scale industrial production, and easy availability of raw materials

Inactive Publication Date: 2012-10-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2007, Chen et al. reported adding acetylene black (AB) to PVDF, using DMF as a solvent, and using DMF as a solvent to make a PVDF / AB composite membrane material, which has a dielectric constant of about 50 at 1KHZ, but Compared with high dielectric ceramics and bulk composite materials, there is still a big gap

Method used

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  • Copolymer-sylvite composite film material and its preparation method
  • Copolymer-sylvite composite film material and its preparation method
  • Copolymer-sylvite composite film material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP): potassium carbonate (K 2 CO 3 ), weigh the raw materials according to their mass ratio of 0.7:0.3, place the weighed raw materials in a nylon ball mill tank, use absolute ethanol as the medium, and ball mill them on a conventional ball mill for 16 hours, take out the milled slurry and Dry in a constant temperature drying oven at 80°C to form a mixed powder; add 10ml of organic solvent N, N-dimethylformamide (DMF) to the dried mixed powder to obtain a mixed solution; place the mixed solution on a magnetic stirrer Heat to 50°C and stir to dissolve the PVDF-HFP completely; then use an ultrasonic oscillator to vibrate until potassium carbonate (K 2 CO 3) is uniformly dispersed in the mixed solution to obtain a composite solution, and then the obtained composite solution is poured on a flat glass sheet cleaned by deionized water and absolute ethanol and cast evenly; the flat glass sheet loaded with the compo...

Embodiment 2

[0040] Weigh polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP): potassium carbonate, and weigh the raw materials according to their mass ratio of 0.8:0.2, put the weighed raw materials in a nylon ball mill tank, and use absolute ethanol as the medium , milled on a conventional ball mill for 6 hours, the slurry after ball milling was taken out and dried in a constant temperature drying oven at 80°C to form a mixed powder; 15ml of organic solvent N,N-dimethyl was added to the dried mixed powder formamide (DMF) to obtain a mixed solution; heat the mixed solution to 60°C on a magnetic stirrer and stir to completely dissolve PVDF-HFP; then ultrasonically oscillate to K 2 CO 3 Disperse evenly in the mixed solution to obtain a composite solution, then pour the obtained composite solution on a flat glass sheet cleaned by deionized water and absolute ethanol and make it uniformly cast; place the flat glass sheet loaded with the composite solution Bake in a constant temp...

Embodiment 3

[0044] Weigh polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP): potassium carbonate, and weigh the raw materials according to their mass ratio of 0.9:0.1, put the weighed raw materials in a nylon ball mill tank, and use absolute ethanol as the medium , milled on a conventional ball mill for 10 hours, and the milled slurry was taken out and dried in a constant temperature drying oven at 80°C to form a mixed powder; 20ml of organic solvent N,N-dimethyl was added to the dried mixed powder formamide (DMF) to obtain a mixed solution; heat the mixed solution to 70°C on a magnetic stirrer and stir to completely dissolve PVDF-HFP; then ultrasonically oscillate to K 2 CO 3 Disperse evenly in the mixed solution to obtain a composite solution, then pour the obtained composite solution on a flat glass sheet cleaned by deionized water and absolute ethanol and make it uniformly cast; place the flat glass sheet loaded with the composite solution Bake in a constant temperature...

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Abstract

The invention relates to a copolymer-sylvite composite film material possessing a high dielectric constant, and its preparation method. The method comprises the following steps: weighing and mixing a polyvinylidene fluoride-hexafluoropropene (PVDF-HFP) copolymer and the sylvite according to a designed mass ratio; ball-milling in a ball milling jar with ethanol as a medium to form mixed powder, and adding an organic solvent to the mixed powder to fully dissolve the powder to obtain a mixed solution; and uniformly dumping the mixed solution to a clean and flat glass sheet to make the mixed solution uniformly flow, and drying the glass sheet in a constant temperature box to finally prepare the copolymer-sylvite composite film material with the thickness of 50-150mum. The relative dielectric constant of the composite film material is high to 10<5>-10<6> at 1kHz. The copolymer-sylvite composite film material prepared in the invention has a wide application prospect, and can be applied to polymer dielectric films and the like.

Description

technical field [0001] The invention relates to a composite membrane material and its preparation technology, in particular to a high dielectric constant copolymer polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP)-potassium salt composite membrane material and its preparation method , belongs to the field of high dielectric composite membrane materials. Background technique [0002] Due to its excellent dielectric properties, high dielectric materials have broad application prospects in solid capacitors, microwave dielectric components and other fields, such as: dynamic random access memory, high-power capacitors, etc. And high dielectric ceramics, such as CaCu 3 Ti 4 o 12 , has received extensive attention due to its good dielectric properties. However, high-dielectric ceramics are brittle and require extremely high preparation temperatures, which limits their applications, especially in integrated circuits. [0003] However, high dielectric copolymer ma...

Claims

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Application Information

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IPC IPC(8): C08L27/20C08K3/26C08K5/098C08K3/16C08J5/18
Inventor 朱基亮梁爽郑茂梅汪忠兴孙平张鹏宇
Owner SICHUAN UNIV
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