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Preparation method of full-flexible tensile sensor suitable for 3D printing

A 3D printing, flexible and conductive technology, applied in 3D object support structure, additive manufacturing, manufacturing tools, etc., can solve the problems of low flexibility, no sensor stability, human injury, etc., to improve service life, good electricity Effects on Response Performance and Lifetime

Active Publication Date: 2020-04-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent has the following limitations: 1) The sensor is a pressure-sensitive sensor, which is not suitable for tensile load; 2) This patent lacks corresponding research on pressure-sensitive performance
3) SiO used 2 The modified powder is nano-scale (20-25nm), the dust is harmful to the human body, and the DMF and TEOS solvents used are both toxic
This patent has the following characteristics and limitations: 1) The sensor is a pressure sensor, which is not suitable for tensile load; 2) The elasticity of the sensor is mainly provided by the PDMS membrane, and the elasticity of the sensing membrane is low; 3) This patent lacks the pressure sensor. Testing of Sensing Performance Parameters
The material has the following limitations: 1) The material is prepared by screen printing, which cannot be prepared in any shape; 2) There is a lack of research on the flexible elongation and electrical performance of the material; 3) The filling content is high, reaching more than 60%
The material has the following limitations: 1) The sensor recognizes that the load is a bending load and does not have stretchability; 2) The flexible sensor fails when the bending load sensor is above 75°, and the flexibility is low
[0016] (1) Most of the flexible sensors currently prepared are pressure-sensitive sensors, and some are bending sensors. Some flexible stretch sensor sensing materials are inflexible, and there is a lack of preparation and performance research on fully flexible stretch sensors.
[0017] (2) Most of the sensor products in the patents lack sensor performance reports, and there is no research on sensor sensing stability
[0018] (3) The solvents and fillers used in many materials suitable for 3D printing have certain toxicity, and they are easy to cause damage to the health of personnel during operation

Method used

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  • Preparation method of full-flexible tensile sensor suitable for 3D printing
  • Preparation method of full-flexible tensile sensor suitable for 3D printing
  • Preparation method of full-flexible tensile sensor suitable for 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The liquid conductive rubber formula is 63wt% liquid silicone rubber, 27wt% silver-plated glass fiber (18wt% silver plating, aspect ratio 200μm:8μm), 4wt% carbon fiber, 4wt% 1,2 propylene glycol, 2wt% simethicone. Prepare according to the following steps: ① Mixing, add the prepared materials in order of liquid silicone rubber, silver-plated glass fiber, carbon fiber, 1,2 propylene glycol and simethicone oil and mix evenly; ② Degassing canned : Inject the mixed liquid conductive rubber into the printing syringe after vacuum degassing, and degassing again after injection; ③Print and shape, the inner diameter of the extrusion needle is 0.42mm, the pressure is 0.5MPa, the printing speed is 8cm / s; the embedding depth is 0.3mm; ④ Curing, curing temperature 120 ℃, 10min.

[0040] The finished product has a volume resistivity of 0.085Ω·cm, a tensile strength of 3.1MPa, an elongation at break of 265%, a sensitivity (resistance change rate / strain) of 17, and stable performance wi...

Embodiment 2

[0042] The liquid conductive rubber formula is 60wt% liquid silicone rubber, 32wt% silver-plated glass fiber (silver plating amount 18wt% aspect ratio 200μm: 8μm), 3wt% carbon fiber, 3wt% 1,2 propylene glycol, 2wt% simethicone. Prepare according to the following steps: ① Mixing, add the prepared materials in order of liquid silicone rubber, silver-plated glass fiber, carbon fiber, 1,2 propylene glycol and simethicone oil and mix evenly; ② Degassing canned : Inject the mixed liquid conductive rubber into the printing syringe after vacuum degassing, and degassing again after injection; ③Print and shape, the inner diameter of the extrusion needle is 0.42mm, the pressure is 0.5MPa, the printing speed is 8cm / s; the embedding depth is 0.3mm; ④ Curing, curing temperature 120 ℃, 10min.

[0043] The finished product has a volume resistivity of 0.021Ω·cm, a tensile strength of 2.6MPa, an elongation at break of 243%, a sensitivity (resistance change rate / strain amount) of 14, and stable ...

Embodiment 3

[0045] The liquid conductive rubber formula is 55wt% liquid silicone rubber, 35wt% silver-plated glass fiber (silver plating amount 18wt% aspect ratio 200μm: 8μm), 3wt% carbon fiber, 3wt% 1,2 propylene glycol, 4wt% thinner. Prepare according to the following steps: ① Mixing, add the prepared materials in order of liquid silicone rubber, silver-plated glass fiber, carbon fiber, 1,2 propylene glycol and simethicone oil and mix evenly; ② Degassing canned : Inject the mixed liquid conductive rubber into the printing syringe after vacuum degassing, and degassing again after injection; ③Print and shape, the inner diameter of the extrusion needle is 0.42mm, the pressure is 0.5MPa, the printing speed is 8cm / s; the embedding depth is 0.3mm; ④ Curing, curing temperature 120 ℃, 10min.

[0046] The finished product has a volume resistivity of 0.009Ω·cm, a tensile strength of 2.4MPa, an elongation at break of 232%, a sensitivity (resistance change rate / strain amount) of 11, and stable perf...

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Abstract

The invention discloses a preparation method of a full-flexible tensile sensor suitable for 3D printing, and belongs to the technical field of flexible electronic device manufacturing. The invention has the characteristics that: (1) a fibrous filler is selected as a conductive material in the composite material, and the material filling amount is low; (2) a rigid conductive material and solid compliant particles compound formula is adopted, so that the prepared sensor has stable sensing performance while the printing material has good printing performance; (3) the material preparation and printing process is simple and convenient, the printing material preparation time is less than 1h, and the printing molding only needs ten minutes; (4) the obtained 3D printing product is good in flexibility, the shore hardness is lower than 80, the tensile strength is larger than 2 MPa, and the ductility is larger than 200%; (5) the resistance change rate of the sensor prepared by adopting the methodcan reach 100% under 10% strain, the performance is stable under more than 600 times of cyclic loading, the resistance response is close to linear change, and the like; and (6) the preparation is safe, and the used raw materials are non-toxic and pollution-free silicone rubber and filler.

Description

technical field [0001] It belongs to the field of flexible electronic device manufacturing technology to ensure the flexible and intelligent development of the electronics industry. Background technique [0002] Flexible stretchable sensors are a hot topic in current research, and flexible stretchable sensors made of flexible conductive composite materials have good elasticity and conductivity, which is one of the main directions of current sensor research. [0003] The flexible conductive composite material refers to the addition of conductive materials to the flexible matrix, so that it has a certain degree of conductivity while having excellent elasticity. When the conductive composite material is subjected to external load deformation, its electrical properties will also respond, and it can be used as a mechanical sensor. Using 3D printing technology to obtain high-definition and complex-shaped flexible stretch sensors is a new type of preparation process, but there are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C08L91/00C08K7/06C08K9/10C08K9/02C08K7/14C08K5/053B29C64/124B33Y10/00B33Y70/10
CPCC08L83/04B29C64/124B33Y10/00B33Y70/00C08K2201/001C08L2205/025C08L91/00C08K7/06C08K9/10C08K9/02C08K7/14C08K5/053
Inventor 夏志东赵陈王雪龙林健
Owner BEIJING UNIV OF TECH
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