CN210609758U - Low-voltage electrothermal film - Google Patents
Low-voltage electrothermal film Download PDFInfo
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- CN210609758U CN210609758U CN201921224241.9U CN201921224241U CN210609758U CN 210609758 U CN210609758 U CN 210609758U CN 201921224241 U CN201921224241 U CN 201921224241U CN 210609758 U CN210609758 U CN 210609758U
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Abstract
The utility model discloses a low-voltage electrothermal film, which comprises an insulating film substrate, a conductive coating, an electrode and an insulating protective layer; the conductive coating is prepared by coating high-conductivity slurry on an insulating film substrate; the electrodes are formed by pressing two copper foils on two sides of the conductive coating; the insulating protective layer is covered on the insulating film substrate which is coated with the conductive coating and is pressed with the electrode; the thickness of the insulating film substrate is 50-200 μm; the thickness of the conductive coating is 20-300 μm, and the sheet resistance is 80-300 omega; the thickness of the two copper foils is 10-40 μm, and the distance between the two copper foils is 8-20 cm. The utility model discloses a low-voltage electric heat membrane, the stable performance is safe, and can reach the best temperature under the low-voltage mode.
Description
Technical Field
The invention relates to the technical field of electrothermal films, in particular to a low-voltage electrothermal film.
Background
Low voltage electrothermal films are an important field of application for electrothermal films. Because the common electric heating film is powered by mains supply voltage, if the safety protection is not in place, certain potential safety hazards exist. Therefore, there is a need to develop a low-voltage electrothermal film to solve the worries of people in this respect.
Disclosure of Invention
The invention aims to: provides a low-voltage electrothermal film which has stable and safe performance and can be carried at any time.
The technical scheme of the invention is as follows: a low-voltage electrothermal film comprises an insulating film substrate, a conductive coating, an electrode and an insulating protective layer; the conductive coating is prepared by coating high-conductivity slurry on an insulating film substrate; the electrodes are formed by pressing two copper foils on two sides of the conductive coating; the insulating protective layer is covered on the insulating film substrate which is coated with the conductive coating and is pressed with the electrode; the sheet resistance of the conductive coating is 80-300 omega; the distance between the two copper foils is 8cm-20 cm.
Preferably, the thickness of the insulating film substrate is 50 μm to 200 μm.
Preferably, the insulating film substrate has a thickness of 150 μm.
Preferably, the conductive coating has a thickness of 20 μm to 300 μm.
Preferably, the two copper foils have a thickness of 10 μm to 40 μm.
Preferably, the two copper foils have a thickness of 25 μm.
Preferably, the insulating protective layer is a PET film coated with a hot melt adhesive.
Preferably, the components in the high-conductivity slurry comprise fat-soluble polyurethane, a lipid solvent, conductive carbon powder, a carbon tube, graphene, a high-molecular dispersing agent, a defoaming agent and a film-forming agent.
The components in the formula of the invention are uniformly mixed, wherein the components have the following functions:
fat-soluble polyurethane: the conductive medium has good adhesive property and provides a connecting function between the conductive medium and the substrate;
lipid solvent: the polyurethane adhesive has good polyurethane dissolving capacity, dilutes a connecting agent, is beneficial to forming a pasty substance after a conductive medium is added, and enables the paste to be used for further treatment in coating and printing processes;
conductive carbon powder, carbon tube, graphene: providing conductive carriers;
high-molecular dispersing agent: promoting the dispersion of the conductive medium in the solvent and the connecting agent, so that the slurry is uniformly conductive;
defoaming agent: the foam generated in the batching process is eliminated, and the coating effect is improved;
film-forming agent: the slurry is combined more closely and continuously when forming a film in the using process to form a smooth and uniform film, so that the scrubbing resistance, the weather resistance and the like of the coating are improved.
The low-voltage electrothermal film has the characteristics that: the high-conductivity slurry is adopted, and the thickness of the coating is controlled, so that the square resistance of the manufactured electrothermal film is in the range close to 100 omega. The electric heating film is powered by 12V/24V voltage, and the heating power of the unit area can reach 50-250W/square meter.
The low-voltage electrothermal film has the advantages that: the sheet resistance is low, and the surface temperature of the heating film can be maintained above 30 ℃ at normal room temperature in winter by adopting 12V/24V low-voltage power supply. The electric heating film can play a good role in the application of warming try-on wearing products and other related products.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a schematic diagram of the structure of the conductive coating and the electrode of the low voltage electrothermal film of the present invention;
FIG. 2 is a schematic diagram of the layer structure of the low voltage electrothermal film of the present invention;
wherein: 1. an insulating film substrate; 2. a conductive coating; 3. an electrode; 4. and an insulating protective layer.
Detailed Description
The first embodiment is as follows:
a low-voltage electrothermal film comprises an insulating film substrate 1, a conductive coating 2, an electrode 3 and an insulating protective layer 4; the conductive coating is prepared by coating high-conductivity slurry on an insulating film substrate; the electrodes are formed by pressing two copper foils on two sides of the conductive coating; the insulating protective layer is covered on the insulating film substrate which is coated with the conductive coating and is pressed with the electrode; the device comprises an insulating film substrate, a conductive coating, an electrode and an insulating protective layer; the conductive coating is prepared by coating high-conductivity slurry on an insulating film substrate; the electrodes are formed by pressing two copper foils on two sides of the conductive coating; the insulating protective layer is a PET film coated with hot melt adhesive and is covered on an insulating film substrate coated with a conductive coating and pressed with electrodes; the thickness of the conductive coating is 60 micrometers, and the sheet resistance of the conductive coating is 100 omega; the distance between the two copper foils is 14 cm; the thickness of the insulating film substrate is 150 micrometers; the thickness of the two copper foils is 25 μm; during test, 12V working voltage is applied, the working current is 0.59A, the unit area heating power of the low-voltage electrothermal film is 57 watts, and the surface maintaining temperature is 32 ℃.
Further describing the scheme, the components in the high-conductivity slurry comprise fat-soluble polyurethane, a lipid solvent, conductive carbon powder, a carbon tube, graphene, a polymer dispersant, a defoaming agent and a film-forming agent. The components in the formula of the invention are uniformly mixed, wherein the components have the following functions: fat-soluble polyurethane: the conductive medium has good adhesive property and provides a connecting function between the conductive medium and the substrate; lipid solvent: the polyurethane adhesive has good polyurethane dissolving capacity, dilutes a connecting agent, is beneficial to forming a pasty substance after a conductive medium is added, and enables the paste to be used for further treatment in coating and printing processes; conductive carbon powder: providing conductive carriers; carbon tubes: providing conductive carriers; graphene: providing conductive carriers; high-molecular dispersing agent: promoting the dispersion of the conductive medium in the solvent and the connecting agent, so that the slurry is uniformly conductive; defoaming agent: the foam generated in the batching process is eliminated, and the coating effect is improved; film-forming agent: the slurry is combined more closely and continuously when forming a film in the using process to form a smooth and uniform film, so that the scrubbing resistance, the weather resistance and the like of the coating are improved.
Example two:
the thickness of the conductive coating is 50 μm. The sheet resistance of the conductive coating is 120 omega; the distance between the two copper foils was 13 cm. The thickness of the insulating film substrate is 150 μm. The thickness of the two copper foils was 25 μm. The rest is the same as the first embodiment. During test, 12V working voltage is applied, the working current is 0.68A, the unit area heating power of the low-voltage electrothermal film is 71 watts, and the surface maintaining temperature is 36 ℃.
Example three:
the thickness of the conductive coating is 40 μm. The sheet resistance of the conductive coating is 150 omega; the distance between the two copper foils was 12 cm. The thickness of the insulating film substrate is 150 μm. The thickness of the two copper foils was 25 μm. The rest is the same as the first embodiment. During test, 12V working voltage is applied, the working current is 0.59A, the unit area heating power of the low-voltage electrothermal film is 67 watts, and the surface maintaining temperature is 35 ℃.
Example four:
the thickness of the conductive coating is 30 μm. The sheet resistance of the conductive coating is 200 omega; the distance between the two copper foils was 8 cm. The thickness of the insulating film substrate is 150 μm. The thickness of the two copper foils was 25 μm. The rest is the same as the first embodiment. During test, 12V working voltage is applied, the working current is 0.67A, the unit area heating power of the low-voltage electrothermal film is 113 watts, and the surface maintaining temperature is 39 ℃.
Example five:
the thickness of the conductive coating is 60 μm. The sheet resistance of the conductive coating is 100 omega; the spacing between the two copper foils was 14 cm. The thickness of the insulating film substrate is 150 μm. The thickness of the two copper foils was 25 μm. The rest is the same as the first embodiment. During test, 24V working voltage is applied, the working current is 1.12A, the unit area heating power of the low-voltage electrothermal film is 216 watts, and the surface maintaining temperature is 47 ℃. The parameters of the electric heating film of the implementation example are consistent with those of the implementation example, but the electric heating film generates obviously increased heat when doubled voltage is applied.
The preparation method of the low-voltage electrothermal film comprises the following steps: firstly, weighing the materials of the high-conductivity slurry in place, adding the materials into a closed plastic tank or a metal tank, and stirring the materials for more than 20 hours by using magnetic force or corundum until the materials become uniform paste for use; uniformly coating the prepared high-conductivity slurry on an insulating film substrate to prepare a conductive coating, and pressing and coating two copper foils on two sides of the conductive coating by using electrodes to ensure that the electrodes are in good contact with the coating; the insulating protective layer is made of a PET film coated with hot melt adhesive, the protective film is heated by a heating roller to melt the adhesive surface of the protective film, and then the protective film is covered with an insulating film substrate coated with a conductive coating and pressed with electrodes, so that an electric heating film product with good packaging is formed. The low-voltage electric heating film manufactured by the method has the square resistance close to 100 omega, the voltage of 12V/24V is adopted for power supply, and the heating power of the unit area can reach 50-250W/square meter.
The experimental test conditions for the five examples described above are shown in the following table:
further, the above experimental data are described in the table in which the holding temperature and the ambient temperature have a certain relationship, and the test result data are obtained at the ambient temperature of 27 ℃. The low-voltage electrothermal film is not limited to the parameters in the examples, and the same function can be realized by adopting different substrate thicknesses and copper foil thicknesses.
In conclusion, the square resistance and the electrode interval of the electrothermal film are well controlled, and the electrothermal film with proper working temperature can be obtained by adopting proper voltage for power supply. When the sheet resistance is in the range of 100-200 omega, the interval between the two copper foils is controlled to be 8-20 cm, 12V voltage is applied between the two electrodes, and the heating power of the unit area of the electric heating film can reach the level of 100W/square meter. Such heating power can maintain the surface temperature of the heat generating film at 30 ℃ or higher at normal room temperature in winter. The electric heating film can play a good role in the application of warming try-on wearing products and other related products.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed herein be covered by the appended claims.
Claims (7)
1. A low-voltage electrothermal film is characterized in that: the device comprises an insulating film substrate, a conductive coating, an electrode and an insulating protective layer; the conductive coating is prepared by coating high-conductivity slurry on an insulating film substrate; the electrodes are formed by pressing two copper foils on two sides of the conductive coating; the insulating protective layer is covered on the insulating film substrate which is coated with the conductive coating and is pressed with the electrode; the sheet resistance of the conductive coating is 80-300 omega; the distance between the two copper foils is 8cm-20 cm.
2. The low voltage electrothermal film of claim 1, wherein: the thickness of the insulating film substrate is 50-200 μm.
3. The low voltage electrothermal film of claim 2, wherein: the thickness of the insulating film substrate is 150 μm.
4. The low voltage electrothermal film of claim 1, wherein: the thickness of the conductive coating is 20-300 μm.
5. The low voltage electrothermal film of claim 1, wherein: the two copper foils have a thickness of 10 μm to 40 μm.
6. The low voltage electrothermal film of claim 5, wherein: the thickness of the two copper foils was 25 μm.
7. The low voltage electrothermal film of claim 1, wherein: the insulating protective layer adopts a PET film coated with hot melt adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921224241.9U CN210609758U (en) | 2019-07-31 | 2019-07-31 | Low-voltage electrothermal film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921224241.9U CN210609758U (en) | 2019-07-31 | 2019-07-31 | Low-voltage electrothermal film |
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| CN210609758U true CN210609758U (en) | 2020-05-22 |
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| CN201921224241.9U Expired - Fee Related CN210609758U (en) | 2019-07-31 | 2019-07-31 | Low-voltage electrothermal film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945107A (en) * | 2021-11-30 | 2022-01-18 | 北京工大环能科技有限公司 | High-pressure high-heat-flow molten salt energy storage, adjustment and utilization system |
-
2019
- 2019-07-31 CN CN201921224241.9U patent/CN210609758U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945107A (en) * | 2021-11-30 | 2022-01-18 | 北京工大环能科技有限公司 | High-pressure high-heat-flow molten salt energy storage, adjustment and utilization system |
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Granted publication date: 20200522 Termination date: 20210731 |
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| CF01 | Termination of patent right due to non-payment of annual fee |