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Liquid metal polymer mixed material and preparation method thereof

A technology of liquid metal and mixed materials, which is applied in the direction of instruments, measuring devices, measuring force, etc., can solve the problem of small dielectric constant, which cannot further meet the needs of improving the sensitivity of capacitive pressure sensors, and achieve high dielectric constant and maintain mechanical properties , The effect of low dielectric loss factor

Inactive Publication Date: 2019-12-13
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dielectric constant of the dielectric material in the prior art is generally small, which cannot further meet the requirements of improving the sensitivity of the capacitive pressure sensor.

Method used

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  • Liquid metal polymer mixed material and preparation method thereof
  • Liquid metal polymer mixed material and preparation method thereof
  • Liquid metal polymer mixed material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] See figure 1 , figure 1 It is a flowchart of a preparation method of a liquid metal-polymer mixed material provided by an embodiment of the present invention. Described preparation method comprises:

[0048] S1: Obtain a liquid metal and a polymer;

[0049]Specifically, choose eutectic gallium indium or gallium indium tin alloy as the liquid metal; choose platinum catalyzed silicone rubber (for example, Ecoflex), polydimethylsiloxane (PDMS) or silicone (for example, Dragon Skin10,20&30 ) as the polymer, wherein the polymer includes a liquid prepolymer and a corresponding curing agent. It should be noted that the silicone polymer material used in this example (such as platinum catalyzed silicone rubber, polydimethylsiloxane (PDMS) or silicone, etc.) contains two parts before mixing: prepolymer and The curing agent (cross-linking agent) is used together. After mixing the two parts, it will remain in a liquid state for a period of time. As time goes by, the mixture wil...

Embodiment 2

[0075] On the basis of the above-mentioned embodiment, this embodiment provides another method for preparing a liquid metal-polymer mixed material. The mixed material formed in this embodiment has a foam pore-like structure, and there are a large number of pores inside the material, so that it has a large Good flexibility, compressibility and stability, and has a variable dielectric constant.

[0076] The preparation method of this mixed material comprises:

[0077] Step 1: mixing a liquid metal with a liquid prepolymer of a polymer in a predetermined ratio;

[0078] Specifically, choose eutectic gallium indium or gallium indium tin alloy as the liquid metal; choose platinum catalyzed silicone rubber (for example, Ecoflex), polydimethylsiloxane (PDMS) or silicone (for example, Dragon Skin10,20&30 ) as the polymer. In this embodiment, eutectic gallium indium is preferred as the liquid metal component. The liquid metal is mixed with the prepolymer of the polymer in a liquid s...

Embodiment 3

[0110] On the basis of Embodiment 1 and Embodiment 2, this embodiment provides a liquid metal-polymer mixed material, which can be prepared by the preparation method described in Embodiment 1 or Embodiment 2.

[0111] Specifically, in this embodiment, eutectic gallium indium or gallium indium tin alloy is selected as the liquid metal; platinum catalyzed silicone rubber, polydimethylsiloxane (PDMS) or silicone is selected as the polymer,

[0112] The polymer includes a liquid prepolymer and a corresponding curing agent.

[0113] Further, the mass ratio of the liquid metal to the mixed material is 10%-95%.

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Abstract

The invention discloses a liquid metal polymer mixed material and a preparation method thereof. The preparation method comprises the following steps: obtaining a liquid metal and a polymer; mixing theliquid metal with a prepolymer of the polymer according to a preset proportion to form a mixed solution; adding a curing agent into the mixed solution, and stirring for curing to form a solid mixed material. According to the mixed material, the problem that rigid fillers in a traditional metal polymer mixed material do not match the internal flexibility of the polymer is solved, the mechanical property of a base material is kept, and unique combination of low mechanical rigidity and a high dielectric constant is achieved.

Description

technical field [0001] The invention belongs to the technical field of capacitive pressure sensors, and in particular relates to a liquid metal polymer mixed material and a preparation method thereof. Background technique [0002] Pressure sensors are electronic devices that convert pressure signals into electrical signals, and are widely used in robotics, health care and other fields. According to the working principle, the pressure sensor can be divided into: piezoresistive, capacitive, piezoelectric, inductive, etc. Among them, the capacitive pressure sensor is a kind of electricity that uses capacitive sensitive elements to convert the measured pressure into a certain relationship with it. Output pressure sensors have been widely studied in the field of pressure sensors due to their high sensitivity and temperature independence. [0003] Capacitive pressure sensors usually consist of two electrodes and a dielectric layer between the electrodes. External pressure acts on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K3/08G01L1/14
CPCC08K3/08G01L1/148C08L83/04
Inventor 李杨杨嘉怡张东光杨林安敖金平
Owner XIDIAN UNIV
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