CN112537015A - Method and device for forming high-molecular heat-conducting composite material based on multi-field cooperative regulation - Google Patents
Method and device for forming high-molecular heat-conducting composite material based on multi-field cooperative regulation Download PDFInfo
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- CN112537015A CN112537015A CN202011317307.6A CN202011317307A CN112537015A CN 112537015 A CN112537015 A CN 112537015A CN 202011317307 A CN202011317307 A CN 202011317307A CN 112537015 A CN112537015 A CN 112537015A
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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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; 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
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Abstract
The invention relates to a method and a device for forming a high-molecular heat-conducting composite material based on multi-field coordinated regulation, wherein the method comprises the steps of heating a polymer matrix/paramagnetic filler composite material blank to a high-elastic state, carrying out plastic stretching on the blank in a constant-temperature environment, simultaneously applying a magnetic field to the blank, regulating and controlling the morphological structures of polymer molecular chains and fillers by utilizing a stretching force field and the magnetic field, and forming the polymer composite material with ordered arrangement of the fillers and stretching orientation of the molecular chains in one step. The device comprises an upper chuck and a lower chuck which are arranged along the same axis, and an upper coil and a lower coil which are connected with the chucks; horizontal magnetic field inducing devices connected with the rotary power are arranged on two sides of the chuck; the horizontal magnetic field inducing device and the chuck are both arranged in a thermostatic chamber; the rack is also provided with a guide rod and a screw rod; the screw rod and the guide rod are also provided with a lifting plate, and the upper traction head is connected with the lifting plate. The principle and the equipment of the invention are simple in structure, and simultaneously plastic stretching and magnetic field induction are applied, so that multi-field regulation and control in the forming process are realized.
Description
Technical Field
The invention relates to the technical field of processing and forming of high polymer materials, in particular to a method and a device for forming a high polymer heat-conducting composite material based on multi-field cooperative regulation and control.
Background
The polymer material has wide application prospect in the fields of heat exchange and heat management of a microelectronic system and the like due to the advantages of corrosion resistance, low density, low cost, easy processing and forming and the like, and the bottleneck problem of restricting the development of polymer heat conduction materials is that the heat conduction coefficient is low and the filler content is high. According to the approach of improving the thermal conductivity of polymer materials, the high thermal conductivity polymer materials can be broadly divided into two categories: 1) an intrinsic thermally conductive polymer material; 2) filled thermally conductive polymer composites.
The intrinsic heat-conducting composite material can directly improve the heat-conducting property of the material, but is not suitable for the material with a complex molecular structure, and the preparation difficulty is greatly increased. The filled heat conducting composite material has one or several kinds of heat conducting stuffing added to the polymer matrix to raise the heat conductivity of the composite material, and the filling material and the stuffing may contact and overlap to form continuous passage directly related to the orientation of the stuffing. Increasing the filler content can increase the possibility of forming a heat conduction path, but too high filler usage can also affect the mechanical properties and the comprehensive properties of the composite material, and can also cause the cost and the processing difficulty of the composite material to increase. On the other hand, in the molding and manufacturing process of the high thermal conductivity polymer composite material, in addition to fully playing the role of the thermal conductive filler, attention should be paid to the potential of the polymer matrix in constructing the thermal conductive network, and the intrinsic thermal conductivity contribution rate of the molecular crystal orientation of the polymer matrix is improved. The prior art can not realize the regulation and control of molecular chain morphology and filler orientation structure in one-step molding.
Aiming at the problems of high filler content, low mechanical property, incapability of realizing simultaneous regulation and control of matrix molecular chain morphology and filler orientation structure and the like existing in the conventional preparation method of the high-molecular heat-conducting composite material, the development of a novel method and a device for forming the high-molecular heat-conducting composite material based on multi-field coordinated regulation and control has great significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for molding a high-molecular heat-conducting composite material based on multi-field cooperative regulation, which is simple in structure and high in molding efficiency.
The invention also aims to provide a high-molecular heat-conducting composite material forming device based on multi-field cooperative regulation and control for realizing the method.
The technical scheme of the invention is as follows: a method for forming a high-molecular heat-conducting composite material based on multi-field coordinated regulation comprises the steps of firstly carrying out magnetization modification on a filler to enable the filler to have paramagnetism, preparing a composite material blank through melt blending or solution blending, then heating the polymer matrix/paramagnetic filler composite material blank to a high-elasticity state, carrying out plastic stretching on the composite material blank in a constant-temperature environment, opening entangled molecular chains and arranging the molecular chains along the stretching direction, simultaneously applying a magnetic field to the blank to induce the filler in the polymer to form an oriented structure, and forming the polymer composite material with ordered arrangement of the filler and molecular chain orientation in one step.
The filler can be a single filler or a mixed filler composed of a plurality of fillers.
In the plastic stretching, the stretching speed, the stretching ratio and the ambient temperature can be adjusted according to actual requirements.
The magnetic field includes a vertical magnetic field and a horizontal magnetic field.
The intensity, the type and the acting time of the vertical magnetic field and the horizontal magnetic field can be adjusted according to actual requirements.
The horizontally oriented magnetic field may also rotate reciprocally about an axis.
The invention relates to a polymer heat-conducting composite material forming device based on multi-field cooperative regulation and control for realizing the method, which comprises an upper chuck and a lower chuck which are arranged on a rack up and down along the same axis, and an upper coil and a lower coil which are connected with the chucks; horizontal magnetic field inducing devices are arranged on two sides of the chuck and connected with the rotary power; the horizontal magnetic field inducing device and the chuck are both arranged in a thermostatic chamber; the rack is also provided with a guide rod and a screw rod, and the screw rod is connected with lifting power; the screw rod and the guide rod are provided with a lifting plate, and the upper traction head is connected with the lifting plate.
The upper chuck and the lifting plate can move up and down along the screw rod through lifting power.
The upper limit positions of the upper chuck and the lifting plate do not exceed the constant temperature chamber.
The horizontal magnetic field induction device comprises a left coil and a right coil which are coaxially arranged, and a connecting rod for connecting the left coil and the right coil, wherein the left coil and the right coil are fixedly connected to a large gear, and the large gear is meshed with a small gear.
The pinion is connected with rotary power.
The left coil and the right coil are the same in coil size, the same in number of turns and the same in winding direction and are connected in series in the same circuit.
The upper coil and the lower coil are identical in coil size, same in number of turns and same in winding direction and are connected in series in the same circuit.
The currents in the left and right coils and the upper and lower coils are independently controlled.
The upper chuck is also provided with a magnetic field sensor.
The guide rod and the screw rod are also connected with an upper beam.
Taking polyethylene/carbon nanotube (PE/CNT) composite material as an example, when the device with the above structure is applied to the molding of PE/CNT composite material, the working principle is as follows: firstly, carrying out magnetization modification on CNT to enable the CNT to have paramagnetism, and preparing a PE/CNT blank by melt blending or solution blending; then, the PE/CNT blank is placed between an upper chuck and a lower chuck, the temperature in a thermostatic chamber is controlled to heat the blank to a high elastic state, so that the PE matrix and the CNT filler have certain mobility; starting lifting power, plastically stretching the PE/CNT blank by the upper chuck and the lifting plate under the driving of the screw rod, and opening tangled molecular chains and arranging the tangled molecular chains along the stretching direction; simultaneously electrifying the upper coil and the lower coil to generate a vertical magnetic field, electrifying the left coil and the right coil to generate a horizontal magnetic field, and inducing the filler in the polymer to form an oriented structure; according to actual requirements, the environmental temperature is adjusted through a thermostat, the stretching speed and the stretching ratio are adjusted through lifting power, the technological conditions such as the intensity, the type and the time of a vertical magnetic field and a horizontal magnetic field are adjusted through current, the rotating direction and the speed of the horizontal magnetic field are adjusted through rotary power, and therefore the regulation and control of the molecular chain form and the filler orientation structure are achieved; after a certain time, the temperature of the thermostatic chamber is reduced, and the product is cooled, thereby forming the polymer composite material with orderly arranged fillers and stretching and orienting molecular chains in one step.
Heating a polymer matrix/paramagnetic filler composite blank to a high elastic state, carrying out plastic stretching on the blank in a constant temperature environment, opening entangled molecular chains and arranging the entangled molecular chains along the stretching direction, simultaneously applying a magnetic field to the blank, realizing regulation and control on the form of the filler in the polymer by changing the process conditions of the magnetic field intensity, the type of the magnetic field, the direction of the magnetic field, the acting time of the magnetic field and the like, and forming the polymer composite with ordered arrangement of the filler and stretching orientation of the molecular chains in one step.
Compared with the prior art, the invention has the following beneficial effects:
the method and the device for forming the high-molecular heat-conducting composite material based on multi-field coordinated regulation are simple in principle, the polymer matrix/paramagnetic filler composite material blank is heated to a high-elastic state, plastic stretching is carried out on the polymer matrix/paramagnetic filler composite material blank in a constant-temperature environment, entangled molecular chains are opened and arranged along the stretching direction, meanwhile, a magnetic field is applied to the blank to induce the internal filler of the polymer to form an oriented structure, the polymer composite material with the orderly arranged filler and the stretching orientation of the molecular chains is formed in one step, and the forming efficiency is high.
The method and the device for molding the high-molecular heat-conducting composite material based on multi-field coordinated regulation realize regulation and control on the molecular chain morphology and the filler orientation structure of the composite material product by controlling the plastic stretching and magnetic field induction effects, can realize multi-level micro networks of various morphologies, and improve the product performance.
The polymer heat-conducting composite material forming device based on multi-field coordinated regulation and control is easy to operate and realize, can be used for preparing polymer heat-conducting composite materials of different matrixes and fillers, is wide in application range, can be used for finishing the regulation and control and forming of the molecular chain form and the filler orientation structure, can remarkably reduce the preparation flow and equipment cost, and is flexible and wide in application.
Drawings
Fig. 1 is a schematic structural diagram of a polymer heat-conducting composite material forming device based on multi-field cooperative regulation.
Fig. 2 is a schematic structural diagram of a horizontal magnetic field induction device in a polymer heat-conducting composite material forming device based on multi-field cooperative regulation.
Fig. 3 to fig. 4 are engineering flow charts of the polymer thermal conductive composite material molding apparatus based on multi-field cooperative control in sequence, in accordance with embodiment 1.
In the figure: 1-upper beam; 2-a screw rod; 3-upper traction head; 4-lifting plate; 5-a thermostatic chamber; 6-upper coil; 7-upper clamping head; 8-right coil; 9-lifting power; 10-a frame; 11-rotary power; 12-a pinion gear; 13-gearwheel; 14-lower coil; 15-lower chuck; 16-left coil; 17-a magnetic field sensor; 18-a guide bar; 19-a connecting rod; 20-product blank.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Examples
The embodiment of the invention discloses a method for forming a high-molecular heat-conducting composite material based on multi-field coordinated regulation, which comprises the steps of firstly carrying out magnetization modification on a filler to enable the filler to have paramagnetism, preparing a composite material blank through melt blending or solution blending, then heating the polymer matrix/paramagnetic filler composite material blank to a high-elasticity state, carrying out plastic stretching on the composite material blank in a constant-temperature environment, opening entangled molecular chains and arranging the molecular chains along the stretching direction, simultaneously applying a magnetic field to the blank to induce the filler in the polymer to form an oriented structure, and forming the polymer composite material with ordered arrangement of the filler and stretching orientation of the molecular chains in one step.
The filler can be a single filler or a mixed filler composed of a plurality of fillers. In plastic stretching, the stretching speed, stretching ratio and ambient temperature can be adjusted according to actual requirements.
The magnetic field includes a vertical magnetic field and a horizontal magnetic field.
The intensity, the type and the acting time of the vertical magnetic field and the horizontal magnetic field can be adjusted according to actual requirements. The horizontally oriented magnetic field may also rotate back and forth about the axis.
The molding device for polymer heat-conducting composite material with multi-scale structure control for realizing the method comprises an upper chuck 7 and a lower chuck 15 which are arranged on a frame 10 up and down along the same axis, and an upper coil 6 and a lower coil 14 which are connected with the chucks, as shown in figure 1; the upper chuck is also provided with a magnetic field sensor 17; horizontal magnetic field inducing devices are arranged on two sides of the chuck and connected with the rotary power 11; the horizontal magnetic field inducing device and the chuck are both arranged in the thermostatic chamber 5; the frame is also provided with a guide rod 18 and a screw rod 2, and the screw rod is connected with a lifting power 9; the screw rod and the guide rod are provided with a lifting plate 4, and the upper traction head 3 is connected with the lifting plate.
The upper chuck and the lifting plate can move up and down along the screw rod through lifting power.
The upper limit positions of the upper chuck and the lifting plate do not exceed the constant temperature chamber.
The horizontal magnetic field inducing device comprises a left coil 16 and a right coil 8 which are coaxially arranged, and a connecting rod 19 for connecting the left coil and the right coil, wherein the left coil and the right coil are fixedly connected to a large gear 13, and the large gear 13 and a small gear 12 are meshed with each other, as shown in fig. 2.
The pinion is connected with rotary power.
The left coil and the right coil are the same in coil size, the same in number of turns and the same in winding direction and are connected in series in the same circuit.
The upper coil and the lower coil are identical in coil size, same in number of turns and same in winding direction and are connected in series in the same circuit.
The currents in the left and right coils and the upper and lower coils are independently controlled.
The guide rod and the screw rod are also connected with an upper beam 1.
When the polymer heat-conducting composite material forming device based on multi-field cooperative regulation is used, the specific process comprises the following steps:
(1) opening the thermostatic chamber, placing the polymer matrix/paramagnetic filler composite blank 20 between the upper chuck and the lower chuck, and then closing the thermostatic chamber, as shown in fig. 3;
(2) adjusting the temperature of a thermostatic chamber to heat the blank, starting lifting power after the temperature of the blank reaches a specified temperature, plastically stretching the PE/CNT blank by an upper chuck and a lifting plate under the driving of a screw rod, and opening entangled molecular chains and arranging the molecular chains along the stretching direction; simultaneously electrifying the upper coil and the lower coil to generate a vertical magnetic field, electrifying the left coil and the right coil to generate a horizontal magnetic field, and inducing the filler in the polymer to form an oriented structure;
(3) according to actual requirements, the environmental temperature is adjusted through a constant temperature box, the stretching speed and the stretching ratio are adjusted through lifting power, the technological conditions such as the intensity, the type and the acting time of a vertical magnetic field and a horizontal magnetic field are adjusted through current, and the rotating direction and the rotating speed of the horizontal magnetic field are adjusted through rotary power;
(4) adjusting various process parameters to complete plastic stretching and magnetic field induction processes, wherein the upper stretching limit position is shown in figure 4, reducing the temperature of a thermostatic chamber, cooling a product, and thus forming the polymer composite material with orderly arranged fillers and stretching orientation of molecular chains in one step;
as mentioned above, the present invention can be better realized, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications made according to the present disclosure are intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. A method for forming a high-molecular heat-conducting composite material based on multi-field cooperative regulation is characterized in that a polymer matrix/paramagnetic filler composite material blank is heated to a high-elastic state, plastic stretching is carried out on the blank in a constant-temperature environment, entangled molecular chains are opened and arranged along the stretching direction, meanwhile, a magnetic field is applied to the blank to induce the internal filler of a polymer to form an oriented structure, and the polymer composite material with the ordered arrangement of the filler and the stretching orientation of the molecular chains is formed in one step.
2. The method for molding the polymer heat-conducting composite material based on the multi-field cooperative regulation and control as claimed in claim 1, wherein the filler can be a single filler or a hybrid filler composed of a plurality of fillers, and the filler is magnetized and modified to have paramagnetism.
3. The method for molding the polymer heat-conducting composite material based on the multi-field cooperative regulation and control as claimed in claim 1, wherein during the plastic stretching, the stretching speed, the stretching ratio and the environment temperature can be adjusted according to actual requirements.
4. The method for molding the polymer heat-conducting composite material based on multi-field cooperative regulation and control as claimed in claim 1, wherein the magnetic field includes a vertical magnetic field and a horizontal magnetic field, the strength, type and action time of the vertical magnetic field and the horizontal magnetic field can be adjusted according to actual requirements, and the horizontal magnetic field can also rotate around an axis in a reciprocating manner.
5. A polymer heat-conducting composite material forming device based on multi-field cooperative regulation is characterized by comprising an upper chuck and a lower chuck which are arranged on a rack up and down along the same axis, and an upper coil and a lower coil which are connected with the chucks; horizontal magnetic field inducing devices are arranged on two sides of the chuck and connected with the rotary power; the horizontal magnetic field inducing device and the chuck are both arranged in a thermostatic chamber; the rack is also provided with a guide rod and a screw rod, and the screw rod is connected with lifting power; the screw rod and the guide rod are provided with a lifting plate, and the upper traction head is connected with the lifting plate.
6. The device for forming the high polymer heat-conducting composite material based on multi-field cooperative regulation and control as claimed in claim 5, wherein the upper chuck and the lifting plate can move up and down along the screw rod through lifting power, and the upper limit positions of the upper chuck and the lifting plate do not exceed a thermostatic chamber.
7. The device for forming a high polymer heat-conducting composite material based on multi-field coordinated regulation and control as claimed in claim 5, wherein the horizontal magnetic field inducing device comprises a left coil and a right coil which are coaxially arranged, and a connecting rod for connecting the left coil and the right coil, the left coil and the right coil are fixedly connected to a large gear, the large gear and a small gear are meshed with each other, and the small gear is connected with rotary power.
8. The device for forming the high polymer heat-conducting composite material based on multi-field cooperative regulation and control as claimed in claim 5, wherein the left coil and the right coil have the same size, the same number of turns, the same winding direction, and are connected in series in the same circuit; the upper coil and the lower coil are identical in coil size, same in number of turns and same in winding direction and are connected in series in the same circuit.
9. The device for forming the high polymer heat-conducting composite material based on the multi-field cooperative regulation and control as claimed in claims 8 and 11, wherein the currents in the left and right coils and the upper and lower coils are independently controlled.
10. The device for forming the high polymer heat-conducting composite material based on multi-field cooperative regulation and control as claimed in claim 8, wherein the upper chuck is further provided with a magnetic field sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011317307.6A CN112537015B (en) | 2020-11-23 | 2020-11-23 | Method and device for forming high-molecular heat-conducting composite material based on multi-field cooperative regulation |
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| CN202011317307.6A CN112537015B (en) | 2020-11-23 | 2020-11-23 | Method and device for forming high-molecular heat-conducting composite material based on multi-field cooperative regulation |
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| CN112537015B CN112537015B (en) | 2022-11-15 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168605A (en) * | 2007-10-08 | 2008-04-30 | 华东理工大学 | Method for regulating mechanical property of polyethylene terephthalate/polyolefin mixture by using magnetic field |
| CN111590921A (en) * | 2020-05-21 | 2020-08-28 | 湘潭大学 | Method and device for forming high-molecular heat-conducting composite material based on multi-scale structure control |
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- 2020-11-23 CN CN202011317307.6A patent/CN112537015B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168605A (en) * | 2007-10-08 | 2008-04-30 | 华东理工大学 | Method for regulating mechanical property of polyethylene terephthalate/polyolefin mixture by using magnetic field |
| CN111590921A (en) * | 2020-05-21 | 2020-08-28 | 湘潭大学 | Method and device for forming high-molecular heat-conducting composite material based on multi-scale structure control |
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