CN113414924A - Method and device for continuously preparing polymer-based conductive composite material - Google Patents

Method and device for continuously preparing polymer-based conductive composite material Download PDF

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CN113414924A
CN113414924A CN202110488165.8A CN202110488165A CN113414924A CN 113414924 A CN113414924 A CN 113414924A CN 202110488165 A CN202110488165 A CN 202110488165A CN 113414924 A CN113414924 A CN 113414924A
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flexible soft
soft roller
conductive composite
rolling
composite material
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CN113414924B (en
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吴大鸣
付红波
许红
刘颖
盖子鹏
黄尧
孙靖尧
高小龙
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Beijing University of Chemical Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
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Abstract

The invention discloses a method and a device for continuously preparing a polymer-based conductive composite material, wherein a flexible roller is elastically deformed within a certain range by applying a certain pressure on the flexible roller, and the flexible roller is driven by a transmission mechanism to perform continuous face-to-face three-dimensional space forced rolling compression molding on a blend taking a polymer matrix and a conductive filler as raw materials. The method and the device for continuously preparing the conductive composite material can realize continuous large-area preparation of the conductive composite material through the arrangement of the flexible soft rollers and the control arrangement of the stroke. The polymer-based conductive composite material prepared by the method has the characteristics of obviously reduced surface resistance, flexibility and continuous large-area molding. Compared with the traditional method, the invention has the characteristics of continuous forming, low production cost, simple process, high forming efficiency and the like.

Description

Method and device for continuously preparing polymer-based conductive composite material
Technical Field
The invention relates to the technical field of composite material preparation, in particular to a method and a device for continuously preparing a polymer-based conductive composite material, and belongs to the field of composite material processing technology.
Background
The polymer-based conductive composite material is widely applied to the fields of aerospace, wearable equipment, electromagnetic shielding, supercapacitors or battery electrodes and the like. For the polymer-based conductive composite material, the uniformity and the degree of densification of a conductive network formed by the added conductive filler in the polymer matrix directly influence the functionality and the application field of the polymer-based conductive composite material.
When the polymer-based conductive composite material is prepared by the traditional process, a forced mechanical compression method is adopted to disperse conductive filler in a two-dimensional plane into a polymer matrix, and a conductive network can be formed only when the content of the conductive filler in unit volume exceeds the conductive percolation threshold value of the material to obtain the conductive composite material; however, when the content of the conductive filler reaches a certain amount, the conductive filler is difficult to be effectively and uniformly dispersed in the polymer matrix in a forced mechanical compression manner, so that the dispersion distance between the fillers is uncontrollable, the formed conductive network is not uniformly distributed, and finally, the prepared conductive polymer often has the defects of poor local mechanical properties, non-uniform surface resistance and the like. Meanwhile, the method of mechanical compression is difficult to realize the large-area continuous preparation of the polymer-based conductive composite film. Meanwhile, when the traditional processing method is based on the limit of plane limited assembly, the conductive composite material with high conductivity and linear relation with the content cannot be prepared by simply increasing the content of the conductive filler, and in addition, the increase of the content of the conductive filler directly influences the viscosity of the blend, so that the uncontrollable property of the preparation process is caused. The method of increasing the content of the filler to improve the conductivity of the polymer-based conductive composite material can cause difficulty in a film forming process of the polymer-based conductive composite material, and seriously limits the popularization and application of the prepared polymer-based conductive composite material.
The invention is based on the principle of 'three-dimensional limited domain forced assembly' that rigid rolling rollers in the traditional rolling device are changed into flexible soft rollers with certain flexibility for rolling forming, the 'line-to-face' rolling mode between the traditional rigid rolling roller rolling and a rigid plane is converted into the 'face-to-face' rolling compression forming mode between the soft roller rolling and the rigid plane, and the rolling area formed by local deformation of the soft rollers and the pressure maintaining time of the rolling process are controlled by the controllable downward pressure exerted on the flexible soft rollers and the moving speed of the soft rollers. The blend of the polymer matrix and the conductive filler can uniformly flow in a three-dimensional space direction to form a compact and uniform conductive network to obtain the polymer-based conductive composite material by a face-to-face rolling mode, and the characteristics of continuous production of roll forming are combined. Therefore, the problem that the large-area continuous production of the conductive composite material is difficult to realize while the conductivity is difficult to improve by compression in the traditional processing method is solved.
Disclosure of Invention
The invention aims to provide a method and a device for continuously preparing a polymer-based conductive composite material, which are used for carrying out roll forming by selecting flexible soft rolls with certain elastic modulus to replace rigid rolling rolls. After a certain vertical pressure and a certain moving speed are applied to the soft roller with certain flexibility, the rolling pressure, the rolling area and the pressure maintaining time on the rolling surface in the rolling process can be quantitatively analyzed, and the analysis serves as a theoretical basis for the implementation method.
The invention carries out stress analysis on the pressure distribution on the contact surface of the flexible soft roller and the rigid plane based on the theory of elastic mechanics, and determines the three-dimensional pressure distribution of the contact area of the flexible soft roller and the rigid plane:
Figure BDA0003051282640000021
(1) wherein P is a pressure applied to the central axis of the flexible soft roll in the vertical direction, kgf;
Figure BDA0003051282640000022
is the pressure per unit length in the horizontal Y-axis direction in the contact area, gf; p (Y) pressures at points along the horizontal Y-axis; a is the length of the long edge of the ellipse of the soft roller contact area, and is mm; b is the length of the short edge of the contact zone ellipse, mm;
the deformation amount in the vertical direction z direction in the contact process of the flexible soft roller and the rigid plane is respectively
Figure BDA0003051282640000023
And 0, wherein D is the diameter of the flexible soft roll, mm. The force distribution of the flexible soft roller compression area is controlled by controlling P according to the force analysis of the formula (1).
Based on the elastic theory, under the condition that the length of the long side of the rectangle of the contact area of the flexible soft roller and the rigid surface is a, the invention analyzes the theoretical values of the area of the contact area after the flexible soft roller is compressed by force and the length of the short side of the contact area to obtain the theoretical value of the contact area:
Figure BDA0003051282640000031
(2) in which the area of the S-contact zone, i.e. the roll-forming area, mm2(ii) a b-half the length of the short side of the contact interval rectangle, mm; v1Material influence factor of flexible soft roll, mm2/gf；V2Influence factor of the plane of stiffness, mm2/gf；E1Modulus of elasticity, gf/mm, of the material of the flexible soft roll2；σ1-poisson's ratio of the material of the flexible soft roll; e2Elastic modulus of the material of the rigid plane, gf/mm2；σ2-poisson's ratio of the material of the rigid plane.
The invention analyzes the tangential linear velocity of the contact point of the flexible soft roller and the rigid plane and the horizontal linear velocity on the contact surface based on the plane kinematics. Obtaining the linear velocity of the tangent direction of a contact point A of the flexible soft roller and the rigid surface and the theoretical value of the horizontal velocity of a point B on the next instant rigid plane of the point A:
Figure BDA0003051282640000032
(3) in the formula vALinear velocity in the tangential direction of the contact area A point, mm & s-1；vBThe line speed in the horizontal direction of the point B of the plane of the contact area, mm & s-1(ii) a R is the radius of the flexible soft roller, mm; omega-angular speed, rads of rotation of flexible soft rolls-1(ii) a Theta is radian of an included angle between the contact point A and the flexible soft roller in the vertical direction, and rad;
the invention can control the pressure maintaining time of single rolling process in the continuous rolling forming process by controlling the pressure applied to the flexible soft roller in the vertical direction and the moving speed of the flexible soft roller based on the coulomb friction theorem.
Figure BDA0003051282640000033
Wherein t is the dwell time of a single rolling, s; t is ttotalFor the total dwell time, s, neRolling times are adopted; the pressure maintaining time can be adjusted according to different blend formulas, and the performance of the product obtained by roll forming can be effectively improved.
Thus, the theoretical pressure distribution and dwell time in the continuous roll forming process are obtained by the equations (1), (2), (3) and (4). The conductive composite material can be prepared by adjusting the vertical pressure and the moving speed of the flexible soft roller according to different conductive filler and polymer base formulas to perform continuous rolling forming on the conductive composite material, and the conductive filler is effectively dispersed in a polymer matrix to form a uniform conductive network through a three-dimensional space limited domain, so that the conductivity is effectively improved. Meanwhile, the processing technology can realize large-area continuous preparation of the conductive composite material.
The invention aims to provide a method and a device for continuously preparing a polymer-based conductive composite material, and provides a method and a device for continuously forming a conductive composite material through flexible imprinting in a three-dimensional space, aiming at the problems of uneven conductive network, difficult continuous film forming and the like caused by the fact that the conductive composite material is prepared in a traditional two-dimensional plane forced mechanical imprinting mode. The conductive filler can be uniformly distributed in a three-dimensional space, a uniform and compact conductive network is formed, the conductivity is improved, and meanwhile, the conductive composite material film can be continuously prepared in a large area.
In order to achieve the purpose, the technical scheme adopted by the invention is a device and an implementation method for continuously preparing a polymer-based conductive composite material. The device for continuously preparing the polymer-based conductive composite material comprises a mechanical flexible rolling platform, an electric control measuring system and an upper computer monitoring system.
Specifically, the mechanically compliant rolling platform comprises: the flexible soft roller, a pressing device, a transmission shaft, a linear guide sleeve, a baffle, an inner support frame, a tension spring, an outer support frame, an alternating current servo motor, a pressure sensor and a limit switch; the outer support frame is fixed on the support plate through a second bolt, the support plate is connected to the bottom plate through the second bolt, the guide sleeve is fixed on the outer support frame through a first connecting bolt, the nut first connecting bolt is fixed on the outer support frame, the pressing handle screw rod is fixed on the inner support frame through a welding mode, the guide sleeve is fixed on the outer support frame through the first bolt, the guide pillar and the guide sleeve are in transition fit, the guide pillar is fixed on the inner support frame through the welding mode, and the purpose of the part formed by the components is to apply force through the screw rod and ensure the direction of the pressing force of the guide pillar;
the tensioning spring is fixed between the inner support frame and the outer support frame through a first bolt, so that the magnitude of force applied is adjusted through the rigidity of the spring; the pressure sensor is fixed on the lower-pressure inner support frame through a first bolt;
the two ends of a central shaft of the flexible soft roller are fixed on bearings on the inner support frame, the bearings are fixed on the inner support frame through first bolts, the flexible soft roller is fixed on the central shaft through self tension, the central shaft is used for transmitting down pressure to ensure that the flexible soft roller is deformed through pressing a down handle to obtain a rolling area in a continuous rolling process, and the central shaft drives the flexible soft roller to move and rotate to realize continuous rolling; the central shaft is connected with the transmission clapboard through a bolt, the transmission clapboard is connected with the sliding template through a first bolt, the sliding template is fixed on a sliding block of the sliding module through the first bolt, and the above components aim to transmit the horizontal motion of the sliding module to the central shaft of the flexible soft roller through the transmission clapboard to drive the flexible soft roller, so that the horizontal motion can be realized under the drive of the sliding module, and the horizontal moving speed of the flexible soft roller can be adjusted;
the output shaft of the alternating current servo motor is connected with the sliding die speed reducer through a first bolt, and the speed reducer of the sliding die set is connected with the screw rod through key matching. The alternating current servo motor is provided with an encoder, a motor, an encoder cable and a power cable. AC motor encoder cable is connected with power cable AC motor servo driver
The electric control measuring system comprises low-voltage electrical appliances such as an electric control cabinet, a Siemens smart S7-200CPU-ST40PLC, a Siemens smart S7-200PLC functional module, an alternating current motor servo controller, a 24v direct current stabilized power supply, an alternating current power supply switch, an alternating current power supply indicator light, an emergency stop button, a matched relay and the like
The computer software simulation test system comprises an RCT display screen, an upper computer host and a Fame View monitoring system. The diameter of the flexible soft roller, the length of the flexible soft roller, the modulus value of the flexible soft roller, the Poisson ratio of the flexible soft roller, the modulus value of the rigid plane, the Poisson ratio of the rigid plane, a theoretical pressure value, the moving speed of the flexible soft roller, the theoretical thickness value of a sample, the theoretical length of the sample and the rolling frequency in the rolling process can be set through Fameview monitoring software of an upper computer, and a real-time change curve of time in the rolling process, the moving speed of the flexible soft roller and the time-actual pressure value can be obtained. The ac servo motor operates in a position mode. The upper computer communicates with a PLC in the electric control system through a network cable, the alternating current servo driver communicates with the corresponding PLC functional module, and the pressure sensor and the proximity switch communicate with the PLC functional module through the aviation plug. After the control system is started, signals collected by the pressure sensor and the position sensor, position pulse signals output by the PLC, speed signals output by the alternating current motor and the like are transmitted to the host computer by a network cable communication mode. And the monitoring software of the upper computer Fameview displays and monitors
Compared with the prior art, the invention has the beneficial effects that: the invention provides a method and a device for preparing a continuous conductive composite material, which can realize controllability of pressure, three-dimensional space and pressure maintaining time based on the principle of 'three-dimensional space limited forced assembly'. Compared with the traditional forming method, the conductive network formed by the same part of conductive filler is more uniform and compact.
The process can obviously reduce the percolation threshold of the conductive composite material, the conductive composite material with high conductivity can be obtained under the condition of adding low mass fraction conductive filler, the area of the prepared conductive composite material can be adjusted by adjusting the size and the pressing pressure of the flexible soft roller and the moving stroke of the flexible soft roller, and the forming period can be adjusted by adjusting the moving speed of the flexible soft roller. On the basis, the flexible soft roller continuous rolling method can effectively realize the continuity of the polymer-based conductive composite material and realize large-area molding.
The conductive composite material prepared by the invention has potential application prospect in the fields of wearable electronic equipment, battery electrodes, electromagnetic shielding materials and the like. Compared with the traditional method, the method for continuously preparing the conductive composite material has the characteristics of low cost, simple process, high preparation efficiency and continuous production.
Drawings
FIG. 1 is a schematic diagram of the mechanism of a process implementation apparatus;
FIG. 2 is a schematic view of a control system of the process implementation apparatus;
FIG. 3 is a schematic view of the principle of continuous preparation and molding;
FIG. 4 is a control flow chart for preparing the conductive composite material
FIG. 5 is a diagram of a portion of a sample prepared by a continuous process in an experiment;
FIG. 6 is a scanning electron microscope cross-sectional view of the PDMS/4 wt% carbon fiber composite prepared in example 1;
in the figure: 1. a flexible soft roll; 2. an upper partition plate; 3. a polymer blend; 4. a gasket; 5. a lower partition plate; 6. a central shaft; 7. a pressure bearing plate; 8. sliding the template; 9. a proximity switch; 10. a first connecting bolt; 11. a sliding module; 12. an AC servo motor; 13. a base; 14. a second connecting bolt; 15. a transmission clapboard guide sleeve; 16. a second connecting bolt; 17. a support plate; 18. a pin; 19. a second bolt; 20. a pressure sensor; 21. an inner support frame; 22. an outer support frame; 23. a first connecting bolt; 24. a guide sleeve; 25. a guide post; 26. pressing the handle; 27. a nut; 28. a first connecting bolt; 29. a first connecting bolt; 30. tensioning the spring; 31. a power indicator light; 32. an emergency stop button; 33. an AC power switch; 34. a PLC control core; 35. aerial plug group; 36. a 24V DC power supply; 37. an AC servo motor driver; 38. a transformer; 39. an electrical control cabinet; 40. an alternating current servo motor power cable; 41. an AC servo motor encoder cable; 42. a host computer; 42. an RCT display screen; 43. a Fameview monitoring system;
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1 to 6, a method and an apparatus for continuously preparing a high-conductivity polymer-based conductive composite material, wherein the apparatus for continuously preparing a high-conductivity polymer-based conductive composite material according to the present invention comprises a flexible rolling platform, an electrically controlled measuring system, and an upper computer monitoring system.
The outer support frame (22) is fixed on the base (17) through a second bolt (16), the support plate is connected to the bottom plate through the second bolt, the first nut connecting bolt (23) is fixed on the outer support frame, the lower pressing handle lead screw (26) is fixed on the inner support frame (21) through a welding mode, the guide sleeve (23) is fixed on the outer support frame (22) through the first connecting bolt (23), the guide pillar (24) and the guide sleeve (23) are in transition fit, the guide pillar (23) is fixed on the inner support frame (21) through a welding mode, and the parts formed by the components aim to apply force through the lead screw and ensure the direction of the pressure force of the guide pillar.
The tension spring (30) is fixed between the inner support frame and the outer support frame through a first bolt (29) for adjusting the magnitude of applied force through the rigidity of the spring; the pressure sensor (20) is fixed on the lower-pressure inner support frame through a first bolt;
two ends of a central shaft (6) of the flexible soft roller are fixed on bearings on the inner support frame (21), the bearings are fixed on the inner support frame (21) through first bolts, the flexible soft roller (1) is fixed on the central shaft (6) through self tension, the central shaft is used for transmitting down pressure to ensure that the flexible soft roller is pressed by a down pressing handle (26) to deform to obtain a rolling area in a continuous rolling process, and the central shaft (16) drives the flexible soft roller to move and rotate to realize continuous rolling;
the central shaft (16) of the flexible soft roller is connected with the transmission clapboard (15) through a bolt, the transmission clapboard (15) is connected with the sliding template (9) through a first bolt (10), the sliding template (9) is fixed on the sliding block of the sliding module (12) through the first bolt, the purpose of the components is to transmit the horizontal movement of the sliding module to the central shaft of the flexible soft roller through the transmission clapboard to drive the flexible soft roller to realize the horizontal movement under the driving of the sliding module and realize the adjustability of the horizontal movement speed of the flexible soft roller;
an output shaft of the alternating current servo motor (12) is connected with a speed reducer of the sliding module (12) through a first bolt, and the speed reducer of the sliding module is connected with the screw rod through key matching. The AC servo motor (12) is provided with an encoder, a motor, an encoder cable (40) and a power cable (41). The alternating current motor encoder cable (40) is connected with the power cable (41) and the alternating current motor servo driver (37).
The electric control measuring system comprises an electric control cabinet (39), a Siemens smart S7-200CPU-ST40PLC, a Siemens smart S7-200PLC functional module (34), an alternating current motor servo controller (37), a 24v direct current stabilized power supply (36), an alternating current power supply switch (33), an alternating current power supply indicator lamp (31), an emergency stop button (32), a matched relay and other low-voltage electric appliances.
The computer software simulation test system comprises an RCT display screen (43), an upper computer host (42) and a Fame View monitoring system (44). The diameter of the flexible soft roller, the length of the flexible soft roller, the modulus value of the flexible soft roller, the Poisson ratio of the flexible soft roller, the modulus value of the rigid plane, the Poisson ratio of the rigid plane, a theoretical pressure value, the moving speed of the flexible soft roller, the theoretical thickness value of a sample, the theoretical length of the sample and the rolling frequency in the rolling process can be set through Fameview monitoring software of an upper computer, and a real-time change curve of time in the rolling process, the moving speed of the flexible soft roller and the time-actual pressure value can be obtained. The ac servo motor (12) operates in a position mode. The upper computer communicates with a PLC in the electric control system through a network cable, the alternating current servo driver (37) communicates with the corresponding PLC functional module, and the pressure sensor and the proximity switch communicate with the PLC functional module through the aviation plug. After the control system is started, signals collected by the pressure sensor and the position sensor, position pulse signals output by the PLC, speed signals output by the alternating current motor and the like are transmitted to the host computer by a network cable communication mode. And displaying and monitoring by using upper computer Fameview monitoring software.
The implementation method of the invention comprises the following steps:
1) starting an upper computer, entering into an upper computer Fameview monitoring software, setting the diameter of the flexible soft roller, the length of the flexible soft roller, the modulus value of the flexible soft roller, the Poisson ratio of the flexible soft roller, the modulus value of the rigid plane, the Poisson ratio of the rigid plane, a theoretical pressure value, the moving speed of the flexible soft roller, the theoretical thickness value of the sample, the theoretical length of the sample and the rolling frequency in the working process according to the working principle diagram shown in figure 3, and displaying the rolling area and the pressure holding time which correspond to the formulas (1), (2), (3) and (4) obtained by conversion in an interface. And a time-speed curve and a corresponding pressure change curve in the rolling process can be obtained in a Fameview picture in the picture.
2) According to the schematic diagram of the continuous preparation and forming principle provided by fig. 3, the lower partition plate, the gasket, the polymer blend and the upper partition plate are arranged and placed on the bearing plate in fig. 1 according to the sequence from bottom to top of the conductive composite material with different size requirements shown in fig. 3, and the flexible soft roller is arranged at the initial position for preparation
3) And starting the electric control measuring system, and starting the electric control measuring system by opening the alternating current power supply switch (33) and the corresponding low-voltage electrical appliance in the figure 2. The values of the moving speed, the theoretical pressure value and the rolling frequency of the flexible soft roller set by the upper computer are transmitted to the PLC, and the PLC controls the device for controlling the process flow to carry out continuous rolling forming according to the forming principle diagram shown in figure 3 and the control flow diagram shown in figure 4.
4) The Fameview monitoring software acquires the moving speed, the actual pressure value and the rolling times of the flexible soft roller in the process flow in real time in a network communication mode, and can obtain time corresponding to different rolling times and real-time change curves of the moving speed and the time of the flexible soft roller and the actual pressure value.
5) The preparation states of the conductive composite materials with different size requirements can be obtained by adjusting the device parameters and the process parameters in the figures 1 and 3, and the device and the process provided by the invention can provide a theoretical basis for determining the optimal parameters of the device and the process for preparing the conductive composite material by representing the materials through the conductivity of the conductive composite material through repeated experiments.
Example 1
The method and the device for continuously preparing the polymer-based conductive composite material are adopted to process the combination of Polydimethylsiloxane (PDMS) and 4 wt% of Carbon Fiber (CF) to prepare the conductive composite material.
1) And (3) setting the technological parameters of the continuous preparation of the conductive composite material by adopting upper computer Fameview monitoring software.
2) Preparation of a homogeneous Polydimethylsiloxane (PDMS) and 4 wt% Carbon Fiber (CF) blend
Firstly, taking a polymer matrix and a conductive filler according to a mass fraction ratio; preparing a polydimethylsiloxane/Carbon Fiber (CF) mixed material with the mass fraction of carbon fiber being 4 wt%;
secondly, putting the blend prepared in the first step into a container, putting the blend into a homogenizer, and mechanically blending the blend by rotating and centrifuging according to the parameters of the homogenizer with the rotating speed of 1800r/min and the mixing time of 210 s;
adding the mixture obtained in the step (II) according to the proportion of 10: 1, putting the mixture into a homogenizer for mixing and vacuumizing, wherein the rotating speed of the homogenizer is 500r/min, and the mixing time is 20 s. Vacuumizing for 10min, opening a vacuum valve to remove bubbles, and standing for 2 min.
(iv) Polydimethylsiloxane (PDMS) and the curing agent described in the above examples were all available from Dow Corning, Inc., and the curing agent of PDMS was octamethylcyclotetrasiloxane. The carbon fiber is T300 carbon fiber of Dongli company in Japan, the diameter is 7um, and the length of the carbon fiber after mechanical blending by a homogenizer is 0.05mm-0.8 mm.
2) Preparing a Polydimethylsiloxane (PDMS) and 4 wt% of Carbon Fiber (CF) conductive composite material;
firstly, placing a lower clapboard, a gasket, a polymer blend and an upper clapboard in a descending order and placing the lower clapboard, the gasket, the polymer blend and the upper clapboard on a bearing plate, and placing a flexible soft roller at an initial position for preparation;
and secondly, continuously preparing the conductive composite material according to a theoretical pressure value P, a moving speed v of the flexible soft roller, a theoretical length l of the sample, rolling times n and a theoretical thickness value h of the sample which are set in Fameview software of an upper computer. After one circulation is completed, the flexible soft roller returns to the initial position, the flexible soft roller descends for a certain distance on the basis of the initial position, and the size of the sample is just equal to the theoretical thickness value h when the whole circulation is completed;
thirdly, the sample in the second step after the circulation is finished is placed between two copper plates at the temperature of 100 ℃ for heating and curing, and the polymer-based conductive composite material of silicon rubber/4 wt% carbon fiber can be prepared after the curing time is 30s
And fourthly, the size of the prepared PDMS/4 wt% Carbon Fiber (CF) conductive composite material is 11.2S/m of conductivity obtained by measuring and calculating with a four-probe resistance meter.
In the same way, the formula of different polymer matrixes and conductive fillers can be processed, and the conductive composite material meeting the requirements can be prepared by adjusting the technological parameters.
Compared with other preparation methods of conductive composite materials, the preparation method has the following obvious advantages:
1) the polymer-based conductive composite material can be simply and conveniently prepared by the characteristics of low preparation cost, simple process and high preparation efficiency;
2) on the basis of the invention, large-area continuous production of the conductive composite material can be simply and conveniently realized;
although the present invention and embodiments have been described above to facilitate the full understanding of the present application by those skilled in the art, such description is not limiting, and the above-described embodiments are only partial embodiments. In summary, it is within the scope of the present invention for a person of ordinary skill in the art to implement similar embodiments without inventive design or only modifying the appended claims without departing from the spirit of the present invention.

Claims (4)

1. The device for continuously preparing the polymer-based conductive composite material is characterized by comprising a mechanical flexible rolling platform, an electric control measuring system and an upper computer monitoring system;
in the mechanical flexible rolling platform, an outer support frame (22) is fixed on a base (17) through a second bolt (16), a support plate is connected onto a bottom plate through the second bolt, a first nut connecting bolt (23) is fixed on the outer support frame, a pressing handle lead screw (26) is fixed on the inner support frame (21) through a welding mode, a guide sleeve (23) is fixed on the outer support frame (22) through the first connecting bolt (23), a guide pillar (24) and the guide sleeve (23) are in transition fit, and the guide pillar (23) is fixed on the inner support frame (21) through a welding mode;
the tension spring (30) is fixed between the inner support frame and the outer support frame through a first bolt (29); the pressure sensor (20) is fixed on the lower-pressure inner support frame through a first bolt;
two ends of a central shaft (6) of the flexible soft roller are fixed on bearings of the inner support frame (21), the bearings are fixed on the inner support frame (21) through first bolts, and the flexible soft roller (1) is fixed on the central shaft (6) through self tension;
the central shaft (6) of the flexible soft roller is connected with the transmission clapboard (15) through a bolt, the transmission clapboard (15) is connected with the sliding template (9) through a first bolt (10), and the sliding template (9) is fixed on the sliding block of the sliding module (12) through the first bolt;
an output shaft of the alternating current servo motor (12) is connected with a speed reducer of the sliding module (12) through a first bolt, and the speed reducer of the sliding module is connected with the screw rod through key matching; the alternating current servo motor (12) is provided with an encoder, a motor, an encoder cable (40) and a power cable (41); the alternating current motor encoder cable (40) is connected with the power cable (41) and the alternating current motor servo driver (37);
in the upper computer monitoring system, the diameter of a flexible soft roller, the length of the flexible soft roller, the modulus value of the flexible soft roller, the Poisson ratio of the flexible soft roller, the modulus value of a rigid plane, the Poisson ratio of the rigid plane, a theoretical pressure value, the moving speed of the flexible soft roller, the theoretical thickness value of a sample, the theoretical length of the sample and the rolling frequency in the rolling process are set through Fameview monitoring software of an upper computer, and a real-time change curve of time in the rolling process, the moving speed of the flexible soft roller and the time-actual pressure value is obtained; displaying and monitoring by using upper computer Fameview monitoring software; the upper computer is communicated with a PLC in the electric control system through a network cable.
2. The apparatus for continuously preparing a polymer-based conductive composite material according to claim 1, wherein the ac servo motor (12) is operated in a position mode.
3. The apparatus for continuously preparing polymer-based conductive composite material according to claim 1, wherein the ac servo driver (37) communicates with the PLC function module corresponding to the electrically controlled measuring system, and the pressure sensor and the proximity switch communicate with the PLC function module through the air plug; after the control system is started, signals collected by the pressure sensor and the position sensor, position pulse signals output by the PLC, speed signals output by the alternating current motor and the like are transmitted to the host computer by a network cable communication mode.
4. A method for the continuous production of polymer-based conductive composites using the apparatus of claim 1, characterized in that: carrying out roll forming by selecting flexible soft rollers with elastic modulus to replace rigid rolling rollers; the implementation method comprises the following steps:
1) starting an upper computer, entering Fameview monitoring software of the upper computer, setting the diameter of a flexible soft roller, the length of the flexible soft roller, the modulus value of the flexible soft roller, the Poisson ratio of the flexible soft roller, the modulus value of a rigid plane, the Poisson ratio of the rigid plane, a theoretical pressure value, the moving speed of the flexible soft roller, the theoretical thickness value of a sample, the theoretical length of the sample and the rolling frequency in the working process according to the working principle, and displaying the corresponding rolling area and the pressure maintaining time obtained by conversion in an interface; obtaining a time-speed curve and a corresponding pressure change curve in the rolling process in a Fameview picture in the picture;
2) according to the provided continuous preparation and forming principle, the lower partition plate, the gasket, the polymer blend and the upper partition plate are placed on the bearing plate according to the sequence of the conductive composite materials with different size requirements from bottom to top, and the flexible soft roller is placed at the initial position for preparation
3) Starting the electric control measuring system, and starting the electric control measuring system by opening an alternating current power switch (33) and a corresponding low-voltage electrical appliance; the flexible soft roller moving speed, the theoretical pressure value and the rolling frequency value set by the upper computer are transmitted to the PLC, and the PLC controls the process flow to be continuously rolled and molded according to the control flow;
4) acquiring the moving speed, the actual pressure value and the rolling times of the flexible soft roller in the process flow in real time by Fameview monitoring software in a network communication mode, and obtaining time corresponding to different rolling times and a real-time change curve of the moving speed and the time of the flexible soft roller and the actual pressure value;
5) the preparation states of the conductive composite materials with different size requirements are obtained by adjusting device parameters and process parameters, and the materials are characterized by the conductivity of the conductive composite materials through repeated experiments, so that a theoretical basis can be provided for determining the optimal parameters of the provided device and process for preparing the conductive composite materials.
CN202110488165.8A 2021-05-06 2021-05-06 Method and device for continuously preparing polymer-based conductive composite material Active CN113414924B (en)

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