Continuous production technology of polytetrafluoroethylene membrane with electromechanical energy transition function

A polytetrafluoroethylene piezoelectric and polytetrafluoroethylene technology, which is applied in the manufacture/assembly of piezoelectric/electrostrictive devices, circuits, electronic equipment, etc., can solve the problems of low storage stability, weakened piezoelectric effect, and loss of and other problems, to achieve excellent piezoelectric performance, high thermal temperature resistance, and high production efficiency.

Active Publication Date: 2012-02-15
SHANGHAI DAGONG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the low space charge storage stability of the PP material itself, the operating temperature of the PP piezoelectric electret film generally cannot exceed 60 o C, when the operating temperature is higher than the piezoelectric effect of the PP piezoelectric electret film will be sharply weakened or even completely lost
However, there is no report on the large-scale and continuous production process of piezoelectric electret films with high thermal stability.

Method used

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  • Continuous production technology of polytetrafluoroethylene membrane with electromechanical energy transition function
  • Continuous production technology of polytetrafluoroethylene membrane with electromechanical energy transition function
  • Continuous production technology of polytetrafluoroethylene membrane with electromechanical energy transition function

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Experimental program
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Effect test

Embodiment 1

[0034] see figure 1 As shown in the schematic diagram of the piezoelectric electret material microstructure, space charge distribution, and piezoelectric effect of the present invention, a continuous production process of polytetrafluoroethylene electromechanical energy conversion functional membranes, including microporous composite membranes The thermal bonding step and the charging step of the composite film are two parts, wherein,

[0035] The thermal bonding step of the microporous structure composite membrane is: adopt two layers of dense PTFE films 6 and 8 with a thickness of 5 μm and an expanded porous PTFE film 7 with a thickness of one layer of 5 μm, and sandwich the expanded porous PTFE film 7 between the two layers. Form a film system between the dense PTFE films 6 and 8, and then import two upper and lower hot pressing rollers 9 and 10 with a diameter of 150mm to carry out hot pressing bonding, and the embossing on the surface of the upper and lower hot pressing ...

Embodiment 2

[0042] A film surface electroplating system 14 and a contact charging system 15, 16 are arranged between the upper and lower hot pressing rollers 9, 10 and the winding roller 13.

[0043] A continuous production process of polytetrafluoroethylene electromechanical energy conversion functional film, including two parts: the thermal bonding step of the microporous structure composite film and the charging step of the composite film, wherein,

[0044] The thermal bonding step of the microporous structure composite membrane is: adopt two layers of dense PTFE film with a thickness of 20 μm and a layer of expanded porous PTFE film with a thickness of 400 μm, sandwich the expanded porous PTFE film between the two layers of dense PTFE film Form a film system between them, through two upper and lower hot pressing rollers 9, 10 with a diameter of 150mm, wherein the embossing on the surface of the upper hot pressing roller 9 is a cross pattern, the temperature is 420°C, and the upper ...

Embodiment 3

[0049] Two layers of 50 μm thick turning PTFE films 6, 8 and one layer of 2 μm thick expanded porous PTFE films 7 are used, and the expanded porous PTFE films 7 are sandwiched between two layers of dense PTFE films 6, 8 to form a film system, and then imported Two upper and lower hot pressing rollers 9 and 10 with a diameter of 150 mm are used for thermocompression bonding. The embossing on the surface of the upper and lower hot pressing rollers 9 and 10 is a cross pattern, and the temperature is 150 ° C. The upper and lower hot pressing rollers The pressure applied by 9 and 10 on the film system is 200MPa, and the speed of the film system traveling between the upper and lower hot pressing rollers 9 and 10 is 10m / min, and the microporous structure PTFE composite film is obtained after hot pressing;

[0050] see figure 2 As shown in the process schematic diagram of the present invention adopting corona polarization to produce PTFE piezoelectric electret film, the charging of d...

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Abstract

The invention relates to a continuous production technology of a polytetrafluoroethylene membrane with an electromechanical energy transition function. The technology comprises two parts consisting of a heat bonding step of a microporous composite membrane and a charging step of the composite membrane, wherein the heat bonding step of the microporous composite membrane is characterized in that: there are at least two compact polytetrafluoroethylene membranes, the composite membrane is prepared through arranging a layer of the porous polytetrafluoroethylene membrane between each adjacent polytetrafluoroethylene membranes to form an alternatively laminated layer, the alternatively laminated layer is introduced into a space between an upper hot press roll and a lower hot press roll, and a polytetrafluoroethylene piezoelectret membrane is obtained through charging the composite membrane; and the charging step of the composite membrane is that: the composite membrane enters a space between an electrode roll and a corona electrode and corona polarization is carried out, or is that: the composite membrane enters an electroplating zone, electrodes are adhered on the upper surface and the lower surface of the composite membrane, and then the composite membrane enters a contact method charging zone. The continuous production technology of the invention has the advantages of continuity and high production efficiency, and products of the polytetrafluoroethylene membrane with the electromechanical energy transition function have excellent piezoelectric performances and high temperature performances.

Description

technical field [0001] The invention relates to a preparation method of a polymer-based functional film, in particular to a continuous production process of a polytetrafluoroethylene electromechanical energy conversion functional film. Background technique [0002] piezoelectric electret piezo electrets (also known as ferroelectret ferroelectrets ) refers to the space charge electret material with piezoelectric effect (that is, the electromechanical energy conversion effect). figure 1 It is the schematic diagram of piezoelectric electret material microstructure, space charge distribution, and piezoelectric effect. [0003] Piezoelectric electret is a new class of piezoelectric functional materials that just appeared around 1990. It combines the strong piezoelectric effect of piezoelectric ceramics and the flexibility of polymer ferroelectric materials (such as polyvinylidene fluoride piezoelectric films) Therefore, this kind of material has broad application prospects i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B37/06B32B37/10
CPCB32B37/06B32B2457/00B32B2305/026B32B2309/02B32B2309/105B32B2309/14B32B2327/18B32B38/0008H10N30/045H10N30/098B32B37/10
Inventor 宫香山张晓青宫继业
Owner SHANGHAI DAGONG NEW MATERIALS
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