CN100416881C

CN100416881C - Ordered orientation device for high polymer piezoelectric material

Info

Publication number: CN100416881C
Application number: CNB2003101100511A
Authority: CN
Inventors: 刘雅言; 张风涛; 郝先; 李莹
Original assignee: Changchun Institute of Applied Chemistry of CAS
Current assignee: Changchun Institute of Applied Chemistry of CAS
Priority date: 2003-11-17
Filing date: 2003-11-17
Publication date: 2008-09-03
Anticipated expiration: 2023-11-17
Also published as: CN1545149A

Abstract

The present invention belongs to an ordered orientation device of high molecular piezoelectric materials, which is composed of a stretching instrument and an ordered orientation instrument of high molecular piezoelectric materials, wherein the stretching instrument and the ordered orientation instrument synchronously run. After being heated, a high molecular piezoelectric film is stretched; at the same time, the piezoelectric film is treated by corona polarization to realize the ordered orientation of crystal forms of the piezoelectric film; the stretching is controlled in a certain multiple; then the film is flattened by flattening rollers; finally, the film is wrapped. In the present invention, the deformation of high molecular films is generated by a mechanical force function; a speed reducer and a gear ratio control the different rotary speeds of two groups of rollers, and control the stretching ratio and the stretching speed of films; accordingly, the crystal form conversion of films is raised, the ordered orientation of films is synchronously carried out, and the purpose of the piezoelectric functionalization of films is achieved. The complete device has simple structure, easily controlled condition and convenient operation.

Description

The orderly aligning device of high polymer piezoelectric material

Technical field

The invention belongs to the orderly aligning device of high polymer piezoelectric material.

Background technology

High polymer piezoelectric material is widely used in industries such as space flight, electronics, medical treatment, and it is compared with the piezoelectric ceramics material has softness, can be made into the characteristics of large tracts of land transducer and transducer, therefore is subjected to people's extensive attention.1 years Naohiro Murayama; People such as Takao0ikawa are on U.S. Pat 3878274 in disclosed being entitled as " polyvinylidene fluoride resin processing film process ", the polyvinylidene fluoride resin powder that the preparation method of piezoelectric membrane adopts suspension polymerisation to obtain has been described, film extrusion, carry out 3.5 times stretching, stretching is divided into dual mode: perpendicular to winding direction; Be parallel to winding direction.With the aluminium electro-deposition in film surface, to the film processing that polarizes, 100～130 ℃ of its draft temperatures; 90 ℃ of polarization temperature; Between polarizing voltage 50～2000KV/cm; 30 minutes polarization times; Heat treatment temperature is 70 ℃, heat treatment time 1 hour.The stretching ratio of this technology can not reach that high crystal formation transforms and the orderly orientation of electricdomain, and technology can not serialization processable polymer piezoelectric membrane, thereby influence the film piezo-electric performance, and is difficult for the realization industrialization.

Summary of the invention

The purpose of this invention is to provide a kind of high polymer piezoelectric material device of orientation in order for preparing.

The present invention is made up of with orderly orientation instrument the tensilometer of synchronous operated high polymer piezoelectric material.The macromolecule piezoelectric membrane stretches after heating, and when stretching film is carried out corona polarizing, makes piezoelectric membrane realize that crystal formation is orientated in order, stretches and is controlled at certain multiple, by nip rolls film is flattened processing then, last rolling.

Description of drawings

Accompanying drawing 1 is the orderly aligning device schematic diagram of high polymer piezoelectric material.

The orderly aligning device of the present invention is made up of stretcher and orderly orientation instrument two parts, stretcher: 1-draws draw roll, the 2-hold-down roller, the 3-nip rolls, 4-brakes draw roll, 5-traction draw roll sprocket wheel, 6-braking draw roll sprocket wheel, two groups of decelerators of 7-, two on motor, external Motor Controller of Electromagnetic Speed Regulation; Orientation instrument: 8-is orientated the instrument outer cover in order in order, and 9-temperature controller, 10-are orientated switch in order, the 11-burner on light, 12-heater, 13-are orientated indicator light in order, and 14-hearth electrode, 15-are arranged the corona polarizing pin electrode more, the 16-voltmeter, external voltage controller, 17-wind-up roll.

Embodiment

Embodiment of the present invention are described below in conjunction with the accompanying drawings:

As shown in the figure, whole aligning device is fixed on the metal frame base, aligning device is divided into two main parts, stretcher and orderly orientation instrument, the traction draw roll 1 that is positioned at the stretcher front end is respectively a pair of steel rider with the braking draw roll 4 that is positioned at the stretcher rear end, each pair roller is all by knob control, the pressure between the scalable up-down rollers; Hold-down roller 2 is made for high-temperature-resisting silicon rubber, skids in the time of can preventing film stretching, guarantees that film has constant draw ratio; After film shaped, nip rolls 3 is housed, is the cydariform nip rolls; Traction draw roll 1, hold-down roller 2, nip rolls 3, braking draw roll 4 four pair rollers insert in the circular hole axle sleeve, be fixed on two groups of fixed supports that are installed on base with screw, two circular holes that have ball bearing are arranged on every group of fixed support, the two ends of traction draw roll 1, hold-down roller 2, nip rolls 3, braking draw roll 4 each upper and lower roll are bumped into respectively in one group of support bracket fastened circular hole, the upper end of support is equipped with regulating handle perpendicular to circular hole, and decelerator connects with axle sleeve with adjustable motor; The outside, lower roll two ends of traction draw roll 1 and braking draw roll 4 is connected traction draw roll sprocket wheel 5 and braking stretching sprocket wheel 6 respectively, the lower roll of the lower roll of traction draw roll 1 and braking draw roll 4 cooperates with chain, and chain is connected respectively on the sprocket wheel of each self-corresponding motor reducer 7; Motor reducer 7 is installed in the bottom of metab, and the decelerator sprocket wheel places same plane with traction draw roll sprocket wheel 5 and braking draw roll sprocket wheel 6; The lower roll other end of traction draw roll 1 is parallel with the end sprocket wheel of the lower roll of nip rolls 3 to be connected with the cross chain bar, and the lower roll other end of braking draw roll 4 is parallel with the end sprocket wheel of the lower roll of hold-down roller 2 to be connected with the cross chain bar; The equipment mid portion is the corona polarizing device, and heater 12 is the heating wire of overcoat metal tube, is fixed on the bottom of orientation instrument, utilizes base plate to conduct heat; Many row's corona polarizing pin electrode 15 materials are red copper, and crosswise fixed is in the central authorities of orientation instrument, and distance is adjustable between the hearth electrode 14, adds man-hour through forging, and material structure is closeer, helps reducing export license, and electrode stability is good; Hearth electrode 14 is a smooth aluminum panel, is fixed on the base plate of orderly orientation instrument, and heat can be transmitted simultaneously corresponding to many row's corona polarizing pin electrodes in the position, can guarantee that film begins to stretch in the middle of two electrodes; Voltmeter 16 is placed in the side of orderly orientation instrument outer cover, links to each other with external voltage controller, can read voltage between the electrode at any time, according to experiment needs regulation and control voltage; Orientation instrument outer cover 8 adopts the polyfluortetraethylene plate of high insulation to make in order, prevents that high-tension electricity from leaking; Burner on light 11 and orderly orientation indicator light 13 are contained in orderly orientation instrument outer cover side, and burner on light 11 links to each other with heater switch, are orientated indicator light 13 in order and are connected with orderly orientation switch 10; Wind-up roll 17 usefulness steelframes and screw are fixed on the base support right side.

Certain multiple can obtain best effect because the macromolecule piezoelectric membrane need stretch, the velocity of rotation of therefore drawing draw roll is the certain multiple of the velocity of rotation of braking draw roll, rotating speed, traction draw roll sprocket wheel 5 and the 6 gear ratio actings in conjunction of braking draw roll sprocket wheel by two groups of decelerators 7 reach this multiple, according to requirement of experiment, the scalable draw ratio.

The raw films of need preparations along braking draw roll 4, hold-down roller 2, is passed in the middle of the electrode of orderly orientation instrument, through traction draw roll 1, nip rolls 3, be wrapped on the wind-up roll 17 again.Open temperature controller 9, when film when heating reaches stretching experiment requirement temperature in the middle of orderly orientation instrument two electrodes, opening device stretching switch (external), by traction draw roll 1 and 4 actings in conjunction of braking draw roll, film is stretched, the speed of wherein drawing draw roll 1 is very fast, and braking draw roll 4 speed are slower; Open orientation instrument switch 10 in order simultaneously,, arrange the 15 beginning glow discharges of corona polarizing pin electrode more, form high voltage electric field between the electrode, film is orientated in order according to requirement of experiment regulation voltage table 16; Film after the polarization that stretches is through the heat-treatment zone, and heat treatment has two effects, and the one, make the film after the polarization be unlikely to the quenching distortion, form coarse surface, influence electrode evaporation, the 2nd, heat treatment can make the piezoelectric property of film more stable.Film after the heat treatment flattens through nip rolls 3, and rolling is on wind-up roll 17 then.

Adopt stretching and the orderly orientation of crystal formation to carry out synchronously, effectively shortened the time of processing macromolecule piezoelectric membrane, reduced the temperature of orderly orientation simultaneously, improved the piezoelectric constant of piezoelectric membrane; Adopt the different control draw ratios of gear ratio and rotating ratio, realized high polymer piezoelectric material serialization preparation; Utilize the macromolecule piezoelectric membrane piezoelectric constant d of this equipment preparation ₃₃Be 17.7～39.5pC/N.

Make macromolecule membrane generation deformation by mechanical force, decelerator and gear ratio are controlled the different rotating speeds of two groups of rollers, draw ratio, the draw speed of control film, thereby the crystal formation conversion that improves film, carry out the orderly orientation of film synchronously, reach the purpose of film piezo-electric functionalization.Package unit is simple in structure, and condition is easy to control, and is easy and simple to handle.

Claims

1. orderly aligning device of high polymer piezoelectric material, form by stretcher and orderly orientation instrument two parts, the braking draw roll (4) that is positioned at the traction draw roll (1) of stretcher front end and is positioned at the stretcher rear end is respectively a pair of steel rider, hold-down roller (2) is made for high-temperature-resisting silicon rubber, after film shaped, nip rolls (3) is housed, traction draw roll (1), hold-down roller (2), nip rolls (3), braking draw roll (4) four pair rollers insert in the circular hole axle sleeve, be fixed on two groups of fixed supports that are installed on base with screw, two circular holes that have ball bearing are arranged on every group of fixed support, traction draw roll (1), hold-down roller (2), nip rolls (3), braking draw roll (4) is on each, the two ends of lower roll are bumped into respectively in one group of support bracket fastened circular hole, the upper end of support is equipped with regulating handle perpendicular to circular hole, and decelerator connects with axle sleeve with adjustable motor; The outside, lower roll two ends of traction draw roll (1) and braking draw roll (4) is connected traction draw roll sprocket wheel (5) and braking draw roll sprocket wheel (6) respectively, the lower roll of the lower roll of traction draw roll (1) and braking draw roll (4) cooperates with chain, and chain is connected respectively on the sprocket wheel of each self-corresponding motor reducer (7); Motor reducer (7) is installed in the bottom of metab, and the decelerator sprocket wheel places same plane with traction draw roll sprocket wheel (5) and braking draw roll sprocket wheel (6); The lower roll other end of traction draw roll (1) is parallel with the end sprocket wheel of the lower roll of nip rolls (3) to be connected with the cross chain bar, and the lower roll other end of braking draw roll (4) is parallel with the end sprocket wheel of the lower roll of hold-down roller (2) to be connected with the cross chain bar; The equipment mid portion is the corona polarizing device, and heater (12) is the heating wire of overcoat metal tube, is fixed on the bottom of orientation instrument, utilizes base plate to conduct heat; Many row's corona polarizing pin electrode (15) materials are red copper, and crosswise fixed is in the central authorities of orientation instrument, and distance is adjustable between the hearth electrode (14), adds man-hour through forging, and material structure is closeer, helps reducing export license, and electrode stability is good; Hearth electrode (14) is a smooth aluminum panel, is fixed on the base plate of orderly orientation instrument, and heat can be transmitted simultaneously corresponding to many row's corona polarizing pin electrodes in the position, can guarantee that film begins to stretch in the middle of two electrodes; Voltmeter (16) is placed in the side of orderly orientation instrument outer cover, links to each other with external voltage controller, can read voltage between the electrode at any time, according to experiment needs regulation and control voltage; Orientation instrument outer cover (8) adopts the polyfluortetraethylene plate of high insulation to make in order, prevents that high-tension electricity from leaking; Burner on light (11) and orderly orientation indicator light (13) are contained in orderly orientation instrument outer cover side, and burner on light (11) links to each other with heater switch, are orientated indicator light (13) in order and are connected with orderly orientation switch (10); Wind-up roll (17) is fixed on the base support right side with steelframe and screw.