Porous impact-resistant tpu composite pressure sensing material, preparation method and application

A technology of sensing materials and impact resistance, applied in the direction of measuring force, instruments, measuring devices, etc., can solve the complex preparation process of three-dimensional porous conductive polymer composite materials, weak bonding force between conductive filler and polymer substrate, energy absorption and impact resistance Poor performance and other problems, to achieve the effect of excellent protection, good mechanical properties, excellent mechanical properties

Active Publication Date: 2020-11-10
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The bonding force between the conductive filler and the polymer substrate in many stress-sensing composite materials is relatively weak, and the conductive filler is easy to fall off from the structure during long-term use, resulting in a decrease in the performance of the conductive material
[0004] (2) The preparation process of three-dimensional porous conductive polymer composites is complicated and the manufacturing cost is high
However, the existing three-dimensional porous polymer composite stress sensor focuses on the research of electrical conductivity (i.e. stress sensing), and seldom considers its energy absorption and impact resistance performance. Therefore, the energy absorption and impact resistance of the existing three-dimensional porous polymer composite stress sensor poor performance

Method used

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  • Porous impact-resistant tpu composite pressure sensing material, preparation method and application
  • Porous impact-resistant tpu composite pressure sensing material, preparation method and application
  • Porous impact-resistant tpu composite pressure sensing material, preparation method and application

Examples

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Effect test

Embodiment 1

[0065] Example 1. Preparation of porous impact-resistant TPU composite stress-sensing material

[0066] (1) Dissolve 10g of TPU particles in 90mL of N'N-dimethylacetamide, mix well, then add 0.2g of carbon nanotubes, and disperse evenly to obtain a mixed solution;

[0067] (2), placing the mixed solution of step (1) in a desiccator filled with water at the bottom, sealing the steam to induce phase separation for 5 days, and obtaining the formed TPU composite pressure sensing material;

[0068] (3), the formed TPU composite pressure sensing material in step (2) was washed twice with 50 mL of ethanol, then washed twice with 100 mL of distilled water, and then the washed TPU composite pressure sensing material was frozen in a -80°C refrigerator for 12 hours , and then placed in a -72°C freeze dryer for 72 hours to obtain a freeze-dried porous impact-resistant TPU composite pressure sensing material.

[0069] In this embodiment, the added mass of conductive material carbon nanotu...

Embodiment 2

[0070] Example 2. Preparation of porous impact-resistant TPU composite stress-sensing material

[0071] (1) Dissolve 30g of TPU particles in 70mL of N'N-dimethylacetamide, mix well, then add 2.4g of carbon nanotubes, and disperse evenly to obtain a mixed solution;

[0072] (2), placing the mixed solution of step (1) in a desiccator filled with water at the bottom, and sealing the steam to induce phase separation for 10 days to obtain a molded TPU composite pressure sensing material;

[0073] (3), the formed TPU composite pressure sensing material in step (2) was washed twice with 50 mL of ethanol, then washed twice with 100 mL of distilled water, and then the washed TPU composite pressure sensing material was frozen in a -80°C refrigerator for 12 hours , and then placed in a -72°C freeze dryer for 72 hours to obtain a freeze-dried porous impact-resistant TPU composite pressure sensing material.

[0074] In this embodiment, the added mass of conductive material carbon nanotube...

Embodiment 3

[0075] Example 3, preparation of porous impact-resistant TPU composite stress sensing material

[0076] The basic scheme is the same as in Example 2, the difference is that in the step (1), 3g of carbon nanotubes are added, that is, the quality of the added carbon nanotubes is 10wt% of the TPU mass;

[0077] In the step (2), the closed steam induces phase separation for 15 days.

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Abstract

The invention discloses a preparation method of a porous impact-resistant TPU composite pressure sensing material. The preparation method comprises the following steps: (1) preparing a uniform mixed solution from thermoplastic polyurethane, a conductive material and an organic solvent; (2) treating the mixed solution by a steam-induced phase separation method to obtain a molded TPU composite pressure sensing material; and (3) washing the molded TPU composite pressure sensing material with alcohol for multiple times, then washing the material with water for multiple times, and performing freeze-drying to obtain the porous impact-resistant TPU composite pressure sensing material. In the mixed solution in the step (1), the mass volume ratio of TPU to the organic solvent is 1g : (1-10) mL. Theporous impact-resistant TPU composite pressure sensing material provided by the invention has good mechanical properties, high sensitive factors and excellent impact resistance and energy absorptionproperties. The preparation method is simple in process, high in quality controllability and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of pressure sensors, in particular to a porous impact-resistant TPU composite pressure sensing material, a preparation method and an application thereof. Background technique [0002] With the rapid development of artificial intelligence and robotics, pressure sensors are widely used in human motion detection, biosignal sensing, and wearable detectors. The materials used to prepare pressure sensors usually include metal or silicon-based composite materials, and conductive polymer composite materials. Different from traditional metal or silicon-based composites, pressure sensors made of conductive polymer composites have attracted much attention due to their good mechanical properties, deformation properties, easy processing, adjustable electrical conductivity, and low density. The conventional method for preparing conductive polymer composites is to introduce conductive fillers into the polymer, where the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08K3/04C08J9/28G01L1/00G01L1/22
CPCC08J9/0066C08J9/0071C08J9/0076C08J9/28C08J2201/0484C08J2375/04C08K3/041C08K3/042C08K3/046C08K2201/001G01L1/00G01L1/22
Inventor 唐秀之郭同罗璐蕾黄小忠
Owner CENT SOUTH UNIV
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