High-temperature-resistant dopamine-coated barium titanate/polyimide (BT@PDA/PI) dielectric nano composite film

A polydopamine-coated barium titanate and nanocomposite technology, which is applied in the fields of ceramic particles/polyimide nanocomposite film and its preparation, high temperature resistant polyimide dielectric nanocomposite material and its preparation, can solve the problem of compounding Problems such as poor temperature resistance of the film, to achieve the effect of increasing the dielectric constant, simple equipment maintenance and cleaning, and simple equipment

Inactive Publication Date: 2020-01-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The base material of this patent is PVDF, and the temperature resistance of the composite film is still not good

Method used

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  • High-temperature-resistant dopamine-coated barium titanate/polyimide (BT@PDA/PI) dielectric nano composite film
  • High-temperature-resistant dopamine-coated barium titanate/polyimide (BT@PDA/PI) dielectric nano composite film
  • High-temperature-resistant dopamine-coated barium titanate/polyimide (BT@PDA/PI) dielectric nano composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~4

[0026] (1) Preparation of BT@PDA nanoparticles: at room temperature, mix 3 g of BT nanoparticles (product of Shanghai Aladdin Biochemical Technology Co., Ltd., purity 99.9%) and 100 mL of 0.1 mol / L hydroxymethylaminomethane buffer (Tris) (product of Beijing Chemical Plant, purity 99%) and 200 mL of deionized water, and magnetically stirred for 20 min; add 100 mL of absolute ethanol and 1 g of dopamine hydrochloride solution (product of Beijing Chemical Plant, purity 98%) to the system ), continue stirring and coating for 6 h, until the system turns dark brown; filter, and wash the obtained product with 1:1 ethanol aqueous solution; centrifuge and wash after standing, and keep the lower sediment; repeat the centrifugation process 5 times, until the system The pH value was close to 7, and finally the obtained product was dried in an oven at 60 °C for 8 h to obtain BT@PDA nanoparticles.

[0027] (2) Synthesis of polyamic acid (PAA): PAA solution was prepared by in-situ polymeriza...

Embodiment 5~8

[0030] Examples 5-8: When preparing BT@PDA nanoparticles, the stirring coating time was extended to 10h, and other process conditions were the same.

[0031] Comparative examples 1-5, using the same process conditions, first blended BT nanoparticles and PAA, and then prepared BT / PI composite film, the filler content was 0, 1vol%, 3vol%, 5vol% and 7vol%, respectively, as a comparison Proportion. Concrete formulation is as shown in Table 1:

[0032] Table 1 embodiment 1 ~ 8 and comparative example 1 ~ 5 formula table

[0033]

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Abstract

The invention discloses a high-temperature-resistant dopamine-coated barium titanate/polyimide (BT@PDA/PI) dielectric nano composite film. The raw material is composed of 93-99vol% of polyimide (PI) as a matrix and 1-7vol% of dopamine-coated barium titanate nanoparticles (BT@PDA) as a filler, and the volume ratio of the barium titanate (BT) nanoparticles to dopamine (PDA) in the filler is (4-5):1;the preparation method comprises the following steps: reacting in an environment of a hydroxymethyl aminomethane buffer solution (Tris); coating BT nanoparticles with a dopamine hydrochloride solution to prepare BT@PDA nanoparticles with a core-shell structure, mechanically blending the BT@PDA nanoparticles with a PAA solution, defoaming a BT@PDA/PAA blending system in vacuum, coating to form a film, and carrying out high-temperature thermal imidization to obtain the composite dielectric film. According to the invention, the BT nanoparticles are coated by the dopamine layer; therefore, the distribution of BT particles in a PI matrix can be improved, the agglomeration among BT nano particles is reduced, the interface bonding among PI matrixes is enhanced, and the defects inside a compositematerial are reduced, so that the BT@PDA/PI nano composite film obtains excellent dielectric properties while maintaining good mechanical properties.

Description

technical field [0001] The invention relates to a high-temperature-resistant polyimide dielectric nanocomposite material and a preparation method thereof, specifically a ceramic particle / polyimide nanocomposite film with high dielectric properties and a preparation method thereof, belonging to high-performance dielectric materials. The field of electrical composite materials preparation. Background technique [0002] In the application of avionics, electrical and automotive industries, underground oil and gas exploration industries, and advanced propulsion systems, dielectric materials are required to work for a long time at 150°C or even higher temperatures. At present, the commonly used polymer dielectric material is biaxially stretched polypropylene (BOPP), which has excellent high breakdown strength (700MV / m) and extremely low dissipation factor (0.0002), but its relatively low dielectric The constant (2.2) and limited operating temperature (below 105 °C) limit its appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K9/10C08K3/24C08J5/18
CPCC08J5/18C08J2379/08C08K3/24C08K9/10C08K2201/003C08K2201/011
Inventor 陈妍慧吴志强周会会刘振国张亮亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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