A through sls with scfco 2 Combined method for preparing polymer-based piezoelectric foam parts

A technology of polymer and polymer powder, which is applied in processing and manufacturing, manufacturing tools, additive manufacturing, etc., can solve the problems that restrict the promotion and development of piezoelectric foam products with complex structures, time-consuming design, high preparation cost, etc., and achieve the best market promotion Value, increase production efficiency, reduce the effect of holding pressure time

Active Publication Date: 2021-11-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned traditional process method needs to customize specific molds according to the requirements of the parts, and the production cost is high and the process is complicated.
[0005] In addition, the above-mentioned traditional three-dimensional manufacturing method often has the disadvantages of long design time and high manufacturing cost when faced with the increasingly updated technological development requirements, especially for the actual needs of various shapes and complex structures of electromechanical conversion devices. This has restricted the popularization and development of piezoelectric foam products with complex structures prepared by traditional methods to a certain extent.

Method used

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  • A through sls with scfco <sub>2</sub> Combined method for preparing polymer-based piezoelectric foam parts
  • A through sls with scfco <sub>2</sub> Combined method for preparing polymer-based piezoelectric foam parts
  • A through sls with scfco <sub>2</sub> Combined method for preparing polymer-based piezoelectric foam parts

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Experimental program
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Effect test

Embodiment 1

[0094] The present embodiment comprises the following steps in parts by weight:

[0095] (1) The polyvinylidene fluoride raw material is pulverized into polyvinylidene fluoride powder with a particle size of 60-250 μm, and dried for later use;

[0096] (2) 100 parts of the spare polyvinylidene fluoride powder of step (1) and flow aid nano-SiO 2 Mix 0.1 parts evenly, and pass through the selective laser sintering process to obtain the laser sintered part; among them, the process parameters of selective laser sintering are: preheating temperature 155 ℃, laser scanning speed 9600mm / s, laser scanning power 40W , the number of laser scans is 1 time, the laser scanning interval is 0.1-0.3mm, and the thickness of the powder layer is 0.1mm;

[0097] (3) The laser sintered part obtained in step (2) is prepared by a supercritical carbon dioxide autoclave pressure foaming method to obtain a PVDF foam part; wherein, the process parameters of the supercritical carbon dioxide autoclave pr...

Embodiment 2

[0101] Present embodiment except step (3) all the other are consistent with embodiment 1:

[0102] (3) The laser sintered parts obtained in step (2) are prepared by supercritical carbon dioxide autoclave pressure foaming method to obtain PVDF foam parts; wherein, the process parameters of supercritical carbon dioxide autoclave pressure foaming method are: the foaming process pressure is 14MPa , the foaming temperature is 161°C, the holding time is 30min, and the holding temperature is 45°C;

[0103] The final PVDF piezoelectric foam product is a test sample with a thickness of 3 mm. After testing, the average cell diameter is 61.70 μm, the cell wall thickness is 40.41 μm, the compression modulus is 8.85 MPa, the β crystal content is 59.4%, and the crystallinity is 40.6%. , The open circuit voltage can reach up to 2.1V, and the short circuit current can reach up to 42nA. After polarization, the open circuit voltage can reach up to 3.3V, and the short circuit current can reach ...

Embodiment 3

[0105] Present embodiment except step (3) all the other are consistent with embodiment 1:

[0106] (3) The laser sintered parts obtained in step (2) are prepared by supercritical carbon dioxide autoclave pressure foaming method to obtain PVDF foam parts; wherein, the process parameters of supercritical carbon dioxide autoclave pressure foaming method are: the foaming process pressure is 14MPa , the foaming temperature is 163°C, the holding time is 30min, and the holding temperature is 45°C;

[0107] The final PVDF piezoelectric foam product is a test sample with a thickness of 3 mm. After testing, the average cell diameter is 67.64 μm, the cell wall thickness is 32.32 μm, the compression modulus is 6.13 MPa, the β crystal content is 61.1%, and the crystallinity is 43.8%. , The open circuit voltage can reach up to 3.5V, and the short circuit current can reach up to 51nA. After polarization, the open circuit voltage can reach up to 4.4V, and the short circuit current can reach ...

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Abstract

The present invention provides a kind of through SLS and ScFCO 2 Combined with the method for preparing polymer-based piezoelectric foam parts, the method is to use piezoelectric functional polymer powder or a mixed powder of piezoelectric functional polymer powder and inorganic filler powder as the main raw material, through selective The laser sintering process is used to prepare laser sintered parts, and then the laser sintered parts are prepared by supercritical carbon dioxide autoclave pressure foaming method to obtain polymer-based foam parts, and finally polarized to obtain polymer-based piezoelectric foam parts. The method of the present invention limits the process parameters of the supercritical carbon dioxide autoclave pressure foaming method, and cooperates with selective laser sintering, and utilizes the special pore structure produced in the process of selective laser sintering to further improve the supercritical carbon dioxide autoclave pressure foaming process. CO during soaking 2 Diffusion, thereby significantly improving the piezoelectric properties and compressive modulus of the final polymer-based piezoelectric foam.

Description

technical field [0001] The invention belongs to the technical field of polymer-based piezoelectric foam products, and relates to a 2 Combining methods for preparing polymer-based piezoelectric foam parts, more specifically by selective laser sintering (SLS) and autoclave foaming with supercritical carbon dioxide (ScFCO 2 ) combined with a method for preparing high-performance polymer-based piezoelectric foam parts. Background technique [0002] In recent years, due to the shortcomings of traditional energy sources such as polluting the environment and being non-renewable, green energy has attracted more and more attention. As a kind of green energy, mechanical energy exists widely in nature, but it is difficult to be effectively utilized. One of the key technical issues is the power-to-electricity conversion efficiency. Therefore, how to improve the power conversion efficiency is a problem that needs to be solved urgently. [0003] Piezoelectric materials are widely used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/153B29C64/314B29B13/06B29C44/60B33Y10/00B33Y40/10
CPCB29B13/065B29C44/60B33Y10/00B29C64/153B29C64/314B33Y40/10
Inventor 陈宁杨程王琪李莉白时兵陈英红
Owner SICHUAN UNIV
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