Barium titanate particles, barium titanate/fluorine-containing polymer composite material, and preparation methods of barium titanate particles and barium titanate/fluorine-containing polymer composite material

A technology of composite materials and barium titanate, which is applied in the field of capacitors and energy storage materials, can solve the problems of low dielectric properties and achieve high dielectric properties, good breakdown performance, and improved dielectric constant

Active Publication Date: 2017-12-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to improve the compatibility between organic and inorganic substances, people have also carried out research on the surface modification of barium titanate particles. The modifiers used are mainly titanate coupling agents and silane coupling agents. The dielectric properties of the composite material are low, the dielectric constant is about 10, and the breakdown field strength of the material is about 100kv / mm

Method used

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  • Barium titanate particles, barium titanate/fluorine-containing polymer composite material, and preparation methods of barium titanate particles and barium titanate/fluorine-containing polymer composite material
  • Barium titanate particles, barium titanate/fluorine-containing polymer composite material, and preparation methods of barium titanate particles and barium titanate/fluorine-containing polymer composite material
  • Barium titanate particles, barium titanate/fluorine-containing polymer composite material, and preparation methods of barium titanate particles and barium titanate/fluorine-containing polymer composite material

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preparation example Construction

[0039] (1) Preparation of barium titanate particles

[0040] The coral-like barium titanate particles of the present invention can be synthesized by liquid phase methods, such as sol-gel method, co-precipitation method, solvothermal method and hydrothermal method. Preferably, the coral-like barium titanate particles of the present invention are prepared by a hydrothermal method.

[0041] The specific process of preparing coral-like barium titanate by hydrothermal method is as follows: deionized water is used as solvent, tetrabutyl titanate and barium hydroxide are used as titanium source and barium source respectively, and cetyltrimethylammonium bromide is used as additive , at a hydrothermal reaction temperature of 150-200°C and a reaction time of 6-15 hours, coral-like barium titanate particles were prepared.

[0042] The preferred reaction temperature and time ranges of the present invention are 180-200°C and 10-15h. More preferred reaction temperature and time are 180°C ...

Embodiment

[0061] Hereinafter, the present invention will be further described in detail through preferred embodiments.

[0062] For comparison, the spherical barium titanate / polyvinylidene fluoride flexible composite material and the spherical barium titanate / polyvinylidene fluoride flexible composite material modified with titanate coupling agent are also listed as the comparison of the present invention example.

Embodiment 1

[0068] The first step, preparation of coral-like barium titanate particles

[0069] Take by weighing 0.1g cetyltrimethylammonium bromide (CTAB) and place in 35ml of deionized water, after fully stirring and dissolving, 2.0g barium hydroxide (Ba(OH) 2 ·8H 2 O) placed in the above solution, fully mixed to form a suspension, then 2ml of tetrabutyl titanate was added to the above suspension and continued to stir for 10 minutes to obtain about 38ml of barium titanate precursor suspension, which was transferred to 100ml In a hydrothermal kettle with a polytetrafluoroethylene lining, seal it, screw it tightly, and place it in an oven at 180°C for hydrothermal reaction for 12 hours, then take the hydrothermal kettle out of the oven and cool it to room temperature, add 30ml of deionized After washing and filtering, the mixture was washed and filtered several times, and dried in a drying oven at 50°C for 7 hours to obtain a white powder. Take a small amount of dried powder for scannin...

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Abstract

The present invention relates to barium titanate particles, a barium titanate / fluorine-containing polymer composite material, and preparation methods of the barium titanate particles and the barium titanate / fluorine-containing polymer composite material. The composite material preparation method comprises: 1) providing barium titanate particles, a fluorine-containing polymer and an organic solvent, wherein the barium titanate particles are coral-like barium titanate particles defined in the claim 1 or 2; 2) modifying the barium titanate particles by using a catechol-based organic acid to obtain modified barium titanate particles; 3) completely mixing the modified barium titanate particles, the fluorine-containing polymer and the organic solvent to obtain a mixed slurry; and 4) casting the mixed slurry, and drying to obtain the composite material. According to the present invention, the barium titanate / polymer high-dielectric-constant composite material can be used as the energy storage dielectric material.

Description

technical field [0001] The invention relates to the field of capacitors and energy storage materials, in particular to barium titanate particles, barium titanate / fluorine-containing polymer high dielectric constant flexible composite materials and preparation methods thereof. Background technique [0002] In recent years, the application of dielectric functional materials in the electronics industry, information industry and energy storage has greatly promoted the development of functional materials, and thus has received great attention. [0003] At present, the research on lightweight and flexible dielectric composites is mainly focused on improving the dielectric properties of the composites by adding a small amount of barium titanate particles (<10% vol) under the premise of ensuring high breakdown performance. The added barium titanate particles are mostly spherical (100nm) in shape, and the organic phase is mostly polyvinylidene fluoride (PVDF). Due to its extraordi...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K9/04C08K3/24
CPCC08K3/24C08K9/04C08K2201/003C08K2201/004C08L2203/20C08L27/16
Inventor 刘晓林李成曲鹏
Owner BEIJING UNIV OF CHEM TECH
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