Low-temperature stretchable flexible stress sensor based on 3D printing and preparation method

A stress sensor and 3D printing technology, applied in the direction of instruments, measuring force, measuring devices, etc., can solve the problems of instability and failure of flexible sensor devices, achieve high sensitivity, good stretchability, and broaden the research field.

Pending Publication Date: 2021-10-19
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the flexible sensing device will become extremely unstable or even fail under the influence of low temperature at sub-zero low temperature, and provide a flexible sensing device with strong stretchability, good stability and high sensitivity in low temperature environment. Stress sensor and preparation method

Method used

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  • Low-temperature stretchable flexible stress sensor based on 3D printing and preparation method

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preparation example Construction

[0038] like figure 1 As shown, a low-temperature stretchable flexible stress sensor based on 3D printing disclosed by the present invention and its preparation method include the following steps:

[0039] Step 1, mixing CNTs and Ag powder to obtain a composite conductive material with zero temperature coefficient;

[0040] Step 2, preparing a flexible substrate by means of 3D printing;

[0041] Step 3, apply the composite conductive substance obtained in step 1 on the flexible substrate prepared in step 2, and lead out electrodes to obtain a semi-finished flexible stress sensor;

[0042] In step 4, the semi-finished flexible stress sensor obtained in step 3 is packaged with PDMS solution to obtain a low-temperature stretchable flexible stress sensor based on 3D printing.

[0043] like figure 2 As shown, the low temperature stretchable flexible sensor provided by the present invention is composed of three layers, which are the base layer c obtained by 3D printing, the condu...

Embodiment 1

[0045] Step 1: Put 50mg of CNTs (carbon nanotubes) and 70mg of nanoscale Ag powder into a grinding bowl for thorough grinding. Then the ground powder is transferred to a beaker filled with 20ml ethanol solution, and the solution is sealed and preserved to prevent ethanol from volatilizing. Put it in an ultrasonic machine for ultrasonication for 1 hour, then place the mixed solution on a magnetic stirrer and stir for more than 10 hours until the mixture is evenly stirred and the mixed solution becomes viscous, and the composite conductive substance of the sensor is obtained.

[0046] Step 2: Weigh 2g Dragon Skin 10Cure Part A and 2g Dragon Skin 10Cure Part B and mix them in a 10ml beaker. This kind of silicone has good tensile properties and a wide temperature range, and can still be used normally in sub-zero low temperature environments. Then add 0.5ml of curing agent and 0.5ml of curing retarder to it, and keep stirring to make it fully mixed. The curing agent can make the m...

Embodiment 2

[0050] Step 1: Put 50mg of CNTs and 67.5mg of nanoscale Ag powder into a grinding bowl for thorough grinding. Then transfer the ground powder to a beaker containing 20ml of ethanol solution. Put it in an ultrasonic machine for ultrasonication for 1 hour, then place the mixed solution on a magnetic stirrer and stir for more than 10 hours until the mixture is evenly stirred and the mixed solution becomes viscous, and the composite conductive substance of the sensor is obtained.

[0051] Step 2: Weigh 2g Dragon Skin 10Cure Part A and 2g Dragon Skin 10Cure Part B and mix them in a 10ml beaker, then add 0.5ml curing agent and 0.5ml curing retarder to it, and keep stirring to make it fully mixed. Transfer the stirred colloid to the needle tube of the three-axis linkage dispensing machine, and fix it on the track movement end of the dispensing machine, add a pressure of 35PSI, and use the pre-designed dispensing machine program to print the mixed colloid on the The stencil is formed...

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Abstract

The invention discloses a low-temperature stretchable flexible stress sensor based on 3D printing and a preparation method thereof, and the method comprises the steps: 1, mixing CNTs and Ag powder, and obtaining a composite conductive material with a zero temperature coefficient; 2, preparing a flexible substrate; 3, coating the flexible substrate prepared in the step 2 with the composite conductive substance obtained in the step 1, and leading out an electrode to obtain a semi-finished product of the low-temperature stretchable flexible stress sensor; and 4, packaging the semi-finished product of the low-temperature stretchable flexible stress sensor obtained in the step 3 to obtain the low-temperature stretchable flexible stress sensor based on 3D printing. According to the method, the tensile property of the flexible stress sensor is greatly improved, and the flexible stress sensor is high in stability, wide in working range, low in cost, simple in process, safer and more environmentally friendly. The prepared sensor has the advantages of being high in stretchability, good in stability and high in sensitivity in a low-temperature environment below zero, and the application field of the flexible stress sensor is greatly widened.

Description

technical field [0001] The invention relates to the technical field of low-temperature flexible stress sensors, in particular to a low-temperature stretchable flexible stress sensor based on 3D printing and a preparation method. Background technique [0002] In recent years, with the development of electronic technology, flexible wearable devices have been widely used in various fields, such as medical pulse monitoring, flexible touch display, military armed equipment, and wearable electronic skin applied to robot arms. Wearable electronic devices use flexible stress sensors as the detection unit of the device. The device detects stress / strain changes based on changes in the resistance of the material itself during stretching or compression. At present, flexible stress sensors based on materials such as carbon nanotubes and metal powders have been well developed, showing broad application potential and development prospects in various fields. [0003] However, the electrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22
CPCG01L1/2293
Inventor 孙士斌何诗宇牛世聪常雪婷王东胜
Owner SHANGHAI MARITIME UNIVERSITY
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