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Silicon dioxide/magnesium oxide/polymer dielectric and hydrophobic composite material and preparation method

A technology of hydrophobic material, silica, applied in the field of nanocomposite materials, can solve the problems of limited application, insufficient dielectric properties and hydrophobic properties, etc. Effect

Inactive Publication Date: 2018-04-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dielectric properties and hydrophobic properties are slightly insufficient, which limits its application in the fields of capacitance and electrowetting.

Method used

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  • Silicon dioxide/magnesium oxide/polymer dielectric and hydrophobic composite material and preparation method
  • Silicon dioxide/magnesium oxide/polymer dielectric and hydrophobic composite material and preparation method
  • Silicon dioxide/magnesium oxide/polymer dielectric and hydrophobic composite material and preparation method

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Embodiment 1-4

[0034] (1) Add 60ml of deionized water, 4g of magnesium chloride hexahydrate, and 1g of polyvinylpyrrolidone into a 100ml stainless steel reactor with a polytetrafluoroethylene liner, stir the solution at room temperature until it becomes clear, then add 3ml of ammonia water dropwise, and stir Seal it after 5 minutes, move it into a blast drying oven and keep it warm at 180°C for 3 hours.

[0035] (2) After the reaction, cool naturally to room temperature; centrifuge to obtain a white precipitate, alternately wash several times with deionized water and ethanol, move to a drying oven at 60° C. and dry for 24 hours to obtain the precursor magnesium hydroxide.

[0036] (3) Burn the precursor magnesium hydroxide in the air for 3 hours at a temperature of 500°C to obtain white magnesium oxide powder (its microscopic shape is flake, such as figure 1 ).

[0037] (4) Take 1 g of the flaky magnesium oxide prepared in step (3), and ultrasonically disperse it in 60 ml of ethanol. Add 0...

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Abstract

The invention relates to the technical field of nanocomposite materials and aims to provide a silicon dioxide / magnesium oxide / polymer dielectric and hydrophobic composite material and a preparation method. The dielectric and hydrophobic material is prepared from polymethyl methacrylate as a polymer matrix and magnesium oxide coated with a silicon dioxide shell as a filling material by blending andtape casting, wherein the filling material accounts for 10%-40% of the total mass of the dielectric and hydrophobic material and adopts silicon dioxide as the shell and flaky magnesium oxide as the core. The silicon dioxide / magnesium oxide / polymer dielectric and hydrophobic composite material and the preparation method have the following advantages: interfacial interaction areas between inorganicparticles as well as between the inorganic particles and a polymer can be increased, the interfacial polarization effect is enhanced, the dielectric constant of the composite material is increased, and the surface hydrophobicity is improved. The preparation process is simple, and the method is high in operability and repeatability. Dielectric, thermal and hydrophobic properties of the composite material can be regulated and controlled by regulating the adding content of inorganic filler, and the composite material can be applied to manufacturing of capacitors, electrowetting displays and other devices and has broad development prospect.

Description

technical field [0001] The invention relates to a silicon dioxide / magnesia / polymer composite dielectric hydrophobic material and a preparation method thereof, belonging to the technical field of nanocomposite materials. Background technique [0002] Dielectric wetting on dielectrics is a control technique for micro-droplets, which is widely used in display, optics, medical, microfluidics and other fields. Among many micro-droplet control technologies, electrowetting display is a new type of display device that uses voltage to control the spreading and aggregation of ink droplets. Compared with other display devices, electrowetting display combines the controllability of electronic display with the reflective display principle of traditional paper, and has excellent and unique development advantages. [0003] The dielectric layer is a particularly critical layer in electrowetting display devices. In addition to insulation, it also needs to have a high dielectric constant and...

Claims

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Application Information

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IPC IPC(8): C08L33/12C08K9/10C08K7/00C08K3/22C08J5/18
Inventor 张启龙夏宇婷陈佳云王倩倩杨辉
Owner ZHEJIANG UNIV
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