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High-dielectric-property self-healing polyurethane composite material as well as preparation method and braking application thereof

A composite material, self-healing technology, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc., can solve restrictive development, dielectric elastomer burning, damage, etc. problems, to achieve the effect of improving dielectric properties, high electromechanical stability, and improving braking performance

Active Publication Date: 2021-06-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dielectric elastomer microbrake usually needs to apply a high voltage (up to thousands of volts) on the dielectric elastomer microbrake during the braking process, and the high voltage is easy to break down the dielectric and cause the life of the dielectric elastomer microbrake to be damaged.
When the dielectric is broken down, the voltage between the electrodes will be released suddenly, and a large amount of heat will be generated in the process, which will cause the dielectric elastomer to burn, thereby damaging the entire dielectric elastomer microbrake
At the same time, the dielectric elastomer microbrake is easily worn or partially damaged during operation, and these shortcomings severely limit its development.

Method used

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  • High-dielectric-property self-healing polyurethane composite material as well as preparation method and braking application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0030] Such as figure 1 Shown is the basic structure of the dielectric elastomer microbrake of the present invention, which is a capacitive structure consisting of a dielectric layer in the middle and flexible electrodes on both sides of the upper and lower sides. The material of the flexible electrodes is conductive carbon grease, and the two poles of the flexible electrodes pass through the The conductive copper foil is connected to the positive and negative electrodes of the high-voltage power supply; the dielectric layer is self-healing polyurethane (PU-UPy) filled with Au / TiC composite filler, wherein the weight content of Au / TiC is 0.02wt%, and the thickness is 100 μm. A method for preparing a dielectric elastomer microbrake with high dielectric performance self-healing performance, comprising the steps of:

[0031] ① Stir PTMEG at 120°C for 2 hours under vacuum, cool to 70°C after removing water;

[0032] ② Add HDI to the flask and stir for 1 hour, then add DBTDL and h...

Embodiment example 2

[0040] Such as figure 1 Shown is the basic structure of the dielectric elastomer microbrake of the present invention, which is a capacitive structure consisting of a dielectric layer in the middle and flexible electrodes on both sides of the upper and lower sides. The electrode material is conductive carbon grease, and the two poles are respectively connected by conductive copper foil. The positive and negative electrodes of the high-voltage power supply; the dielectric layer is self-healing polyurethane (PU-UPy) filled with Au / TiC composite filler, wherein the weight content of Au / TiC is 0.04wt, and the thickness is 100 μm. A method for preparing a dielectric elastomer microbrake with high dielectric performance self-healing performance, comprising the steps of:

[0041] ① Stir PTMEG at 120°C for 2 hours under vacuum, cool to 70°C after removing water;

[0042] ② Add HDI to the flask and stir for 1 hour, then add DBTDL (catalyst) and heat up to 80°C and stir for 3 hours;

...

Embodiment example 3

[0050] Such as figure 1 Shown is the basic structure of the dielectric elastomer microbrake of the present invention, which is a capacitive structure consisting of a dielectric layer in the middle and flexible electrodes on both sides of the upper and lower sides. The electrode material is conductive carbon grease, and the two poles are respectively connected by conductive copper foil. The positive and negative electrodes of the high-voltage power supply; the dielectric layer is a self-healing polyurethane (PU-UPy) filled with Au / TiC composite filler, wherein the weight content of Au / TiC is 0.06wt%, and the thickness is 100 μm. A method for preparing a dielectric elastomer microbrake with high dielectric performance self-healing performance, comprising the steps of:

[0051] ① Stir PTMEG at 120°C for 2 hours under vacuum, cool to 70°C after removing water;

[0052] ② Add HDI to the flask and stir for 1 hour, then add DBTDL and heat up to 80°C and stir for 3 hours;

[0053] ③...

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Abstract

The invention discloses a high-dielectric-property self-healing polyurethane composite material and a preparation method and braking application thereof. The high-dielectric-property self-healing polyurethane composite material is a mixed material composed of an M / TiC composite filler and a self-healing dielectric elastomer material. The weight content of the M / TiC composite filler is 0.02-0.1%, the M / TiC composite filler is a nanoparticle material, and M is any one of Au, Al, Ti, Zr, Fe, Co, Ni, Cu, Ag and Zn. By filling the M / TiC composite filler, on one hand, the dielectric property of an elastomer film is improved, and on the other hand, a new method for improving the braking performance of an elastomer brake is developed. Compared with a traditional ceramic filler, the material has the advantages that the doping amount of M / TiC is smaller, the excellent performance of high dielectricity and low dielectric loss is achieved, and a brake device shows higher electromechanical stability.

Description

technical field [0001] The invention belongs to the field of self-healing elastomer materials and dielectric elastomer micro-brakes, and in particular relates to a self-healing polyurethane composite material with high dielectric performance, a preparation method thereof, and a braking application. Background technique [0002] Most robots today rely on rigid components to excel at repetitive tasks in structured environments. In contrast, living things adapt to their external environment through their soft structures. This difference has prompted the development of soft robots, and new soft robots made of flexible materials that can adapt to their surroundings. Among various soft robotic actuation structures, electric brakes are considered to be the most promising means of braking due to their advantages of softness, high energy density, silent operation, and muscle-like performance. To date, many dielectric elastomer microactuators have been reported and have also been use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08L83/08C08L83/10C08K3/08C08K3/14C08J5/18H02N2/00
CPCC08K3/08C08K3/14C08J5/18H02N2/001C08J2375/08C08J2383/08C08J2383/10C08K2201/011C08K2003/0831C08K2003/0812C08K2003/0881C08K2003/0856C08K2003/0843C08K2003/0862C08K2003/085C08K2003/0806C08K2003/0893C08L75/08
Inventor 于军胜孙延华侯思辉徐康茗李璐
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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