Method for making continuous dielectric films comprising dispersed nanoparticles
A nanoparticle and dielectric film technology, applied in the field of dielectrics, can solve the problems of no way to ensure the mixing of particles, and achieve the effects of reducing error introduction, short processing time, and cost saving
Active Publication Date: 2016-09-14
THE SEC OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTYS GOVERNMENT OF THE UK OF GREAT BRITAIN & NORTHERN IRELAND
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Problems solved by technology
However, such in-situ mixing is not possible in order to produce a continuous feed, and there is no way to ensure that the particles become properly mixed during the process
Method used
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[0029] Figure 1 explains the terms "distribution" and "dispersion". Particles 1 are contained in a matrix 2 . exist Figure 1a In , particles 1 agglomerate in one region. The particles are neither dispersed nor distributed. exist Figure 1b In , there are several random clumps of particles 1 . These particles are distributed but not yet dispersed. exist Figure 1c In , the particles are both dispersed and distributed.
[0030] go to figure 2 , figure 2The method is shown. The general extrusion of polystyrene is known in the prior art. Polystyrene particles are added to the machine 20 through a hopper 21 and entrained by overlapping co-rotating screws 22 located in a cylinder 23 which melt the polystyrene by friction and shear. The temperature along the screw 22 is measured and controlled to ensure constant temperature and pressure. At the end of the machine 20, molten polystyrene is extruded through a die 24 to determine the shape of the emerging strip 25. The str...
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Abstract
The invention provides a method of making a continuous free-form thermoplastic dielectric film (25) uniformly loaded with dispersed nanoparticles, the method comprising the steps of: feeding thermoplastic microparticles (21) into an extruder (23); spraying a secondary feedstock (27) comprising a suspension having nanoparticles in a liquid carrier to form a nanocomposite; and extruding said compound onto a cooled roll (26) at a preset rate , whereby the crystal structure of the nanocomposite film (25) can be controlled by means of an ultrasonic generator (29) while the secondary feedstock (27) is injected into the extruder (23) to continuously mix the secondary feed (27). By selecting the size of the nanoparticles based on their de Broglie wavelength in the crystalline polymer, the dielectric can be mass-produced to fabricate high-capacitance, high-energy-density storage capacitors.
Description
technical field [0001] This invention relates to dielectrics and their use in capacitors. A capacitor is a device that stores electrical charge and generally consists of two conducting plates separated by a dielectric. In an ideal system, the conductive plates hold their charge until discharge is required, and in doing so the conductive plates are able to supply power to the system in a controlled manner. Background technique [0002] Factors that affect capacitance are the area of the plates, their spacing, and the ability of the dielectric between them to store charge and delay applied voltage. The dielectric can be made of any suitable insulating material. The greater the dielectric constant and dielectric breakdown strength, the more energy can be stored. Eventually any capacitor will fail when the potential difference rises above the dielectric strength and causes electrical breakdown of the dielectric. [0003] Dielectrics are often made from thermoplastics or th...
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IPC IPC(8): B29C47/10B29C47/04B82Y30/00B29C47/88B29B7/90H01G4/14B29C48/08B29C48/10B29C48/16B29C48/305
CPCB29C48/16B29C48/914B29C48/08B29C48/287B29C48/288B29C48/142C08J5/18H01G4/18H01G4/206B29B7/90B29C43/222H01G4/14B29K2105/122B29K2105/124B29K2105/162B29K2995/0006B29C48/10B29C2948/92219C08J2325/06B29C48/022B29C2948/92714H01B3/442B29K2995/006B29K2025/06B29K2505/00B29K2505/14C08K3/08C08K3/22C08K2003/0806C08K2003/2241
Inventor M·A·布朗M·S·兰
Owner THE SEC OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTYS GOVERNMENT OF THE UK OF GREAT BRITAIN & NORTHERN IRELAND