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Method for preparing polyvinylidene fluoride piezoelectric foam part based on selective laser sintering

A polyvinylidene fluoride and laser sintering technology is applied in the field of polyvinylidene fluoride-based piezoelectric foam products, and can solve the problems of restricting the promotion and development of piezoelectric foam products with complex structures, high preparation costs, and high production costs, and achieves The best market promotion value, reduce the pressure holding time, and improve the effect of production efficiency

Active Publication Date: 2021-05-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Injection molding also has the above problems, and also needs to customize specific molds according to the requirements of the parts, 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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  • Method for preparing polyvinylidene fluoride piezoelectric foam part based on selective laser sintering
  • Method for preparing polyvinylidene fluoride piezoelectric foam part based on selective laser sintering
  • Method for preparing polyvinylidene fluoride piezoelectric foam part based on selective laser sintering

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Embodiment 1

[0076] The present embodiment comprises the following steps in parts by weight:

[0077] (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;

[0078] (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;

[0079] (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

[0083] The present embodiment comprises the following steps in parts by weight:

[0084] (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;

[0085] (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;

[0086] (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 pressur...

Embodiment 3

[0090] The present embodiment comprises the following steps in parts by weight:

[0091] (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;

[0092] (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;

[0093] (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...

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Abstract

The invention provides a method for preparing a polyvinylidene fluoride based piezoelectric foam part based on selective laser sintering, which is characterized by including: by using polyvinylidene fluoride powder as a main raw material, preparing a laser sintering part through a selective laser sintering process; then preparing the PVDF-based foam part from the laser sintering part by adopting a supercritical carbon dioxide kettle pressure foaming method, and finally carrying out polarization treatment to obtain the PVDF-based piezoelectric foam part. According to the preparation method disclosed by the invention, by limiting technological parameters of a supercritical carbon dioxide kettle pressure foaming method and cooperating with selective laser sintering, the beta crystal form content of polyvinylidene fluoride in the preparation process is maintained and further improved; and under the condition that the inorganic filler is added, the compression modulus can reach 1.44 MPa, and the highest piezoelectric output is 20.9 V.

Description

technical field [0001] The invention belongs to the technical field of polyvinylidene fluoride-based piezoelectric foam products, and in particular relates to a method for preparing polyvinylidene fluoride-based piezoelectric foam products based on selective laser sintering. 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 in electromechanical conversion. Polyvinylidene fluoride (PVDF) has the highest piezoelectric coefficient among known polymers (d33≈-20~-34pC / N)....

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K3/24C08K3/36C08K3/34C08J9/12
CPCC08J9/0066C08J9/0071C08J9/122C08J2203/06C08J2203/08C08J2327/16C08K3/24C08K3/34C08K3/36C08K2201/011
Inventor 陈宁杨程王琪刘鹏举张楚虹华正坤
Owner SICHUAN UNIV