CN113382488A - Flexible heating film with high temperature resistance, preparation method thereof and electric appliance comprising flexible heating film - Google Patents

Abstract

The invention discloses a flexible heating film with high temperature resistance, a preparation method thereof and an electric appliance comprising the same. The flexible heating film with high temperature resistance comprises a heating film body, wherein an electrode part is arranged in a partial area of the heating film body, and the electrode part comprises conductive silver paste printed on the heating film body and a flexible conductive element which is attached to one side, far away from the heating film body, of the conductive silver paste. The temperature resistance of the flexible conductive element is not lower than 300 ℃, and the flexible conductive element is a flexible heating film. The flexible conductive element is a carbon nano tube heating film. The preparation method of the flexible heating film comprises the following steps: printing conductive silver paste on partial area of the heating film body; before the conductive silver paste is not cured, attaching the flexible conductive element to the surface of the conductive silver paste; solidifying the conductive silver paste to firmly adhere the flexible conductive element and the conductive silver paste. The flexible heating film can keep longer service life at higher service temperature.

Description

Flexible heating film with high temperature resistance, preparation method thereof and electric appliance comprising flexible heating film

Technical Field

The invention relates to the technical field of heating films, in particular to a flexible heating film with high temperature resistance, a preparation method thereof and an electric appliance comprising the same.

Background

The flexible heating film has small volume and strong shape adaptability, so the flexible heating film is popular among various electrical appliance manufacturers. The flexible heating film generally includes a heating film body, and electrodes for achieving electrical connection with the heating film body.

At present, the electrodes used in the flexible heating film mainly have the following modes: firstly, using double-conductive copper foil with viscosity on one side, and attaching the double-conductive copper foil to a heating film body when in use; silver paste is printed on the heating film body to be used as an electrode; and thirdly, using the copper bar, and pressing the copper bar and the heating film body to form an electrode.

However, the electrode adopting the first mode is limited by the temperature resistance of the conductive adhesive on the double-conductive copper foil, and when the heating temperature exceeds 150 ℃, the viscosity of the conductive adhesive fails, so that the heating film body and the double-conductive copper foil are in poor contact; with the electrode adopting the second mode, as the long-term temperature resistance of the conductive silver paste is about 200 ℃, the epoxy resin contained in the conductive silver paste can crack along with the increase of the service time, so that the electric connection stability of the electrode is influenced, and the heating effect of the heating film is also influenced; the electrode adopting the third mode has the problem that the copper bar can be attached to the heating film body only by means of the adhesive layer, so that the common adhesive layer is difficult to meet the use requirement, and the adhesive layer with high temperature resistance has the problem of overhigh price.

Therefore, most of the conventional electrodes for flexible heating films are critical to influence the heating performance and the service life thereof, and most of the conventional electrodes can only bear the heating temperature within 200 ℃, but for the electric appliances which need a high service temperature (for example, above 200 ℃) and need to be used for a long time, the conventional electrodes for flexible heating films cannot meet the service requirements.

Disclosure of Invention

In order to overcome the defects, the invention aims to provide a flexible heating film with high temperature resistance, and the flexible heating film can keep longer service life at higher working temperature.

The flexible heating film with high temperature resistance comprises a heating film body, wherein an electrode part is arranged in a partial area of the heating film body, and the electrode part comprises conductive silver paste capable of being electrically conducted with the heating film body and a flexible conductive element which is attached to one side, far away from the heating film body, of the conductive silver paste. The flexible heating film uses the combination of the conductive silver paste and the flexible conductive element as the electrode, so that the electrode part has better conductivity, and the conductive effect of the electrode part cannot be influenced even if the conductive silver paste is subjected to fault due to heating.

Further, the flexible conductive element is a flexible conductive film.

Furthermore, the flexible conductive element is a carbon nano tube heating film. Therefore, the carbon nano tube heating film can ensure good bonding effect with the conductive silver paste by utilizing good flexibility of the carbon nano tube heating film, so that the electrode part can be ensured to have higher electric conduction effect.

The invention also provides a preparation method of the flexible heating film with high temperature resistance, which comprises the following steps: printing conductive silver paste on partial area of the heating film body;

before the conductive silver paste is not cured, attaching the flexible conductive element to the surface of the conductive silver paste;

solidifying the conductive silver paste to firmly adhere the flexible conductive element and the conductive silver paste.

Further, in the step I, conductive silver paste is printed on the heating film body through a silk screen, and the thickness of the silk screen is 1-50 mu m.

The invention also provides a preparation method of the flexible heating film with high temperature resistance, which comprises the following steps:

printing conductive silver paste on a flexible conductive element;

before the conductive silver paste is not cured, the flexible conductive element printed with the conductive silver paste is attached to the heating film body;

solidifying the conductive silver paste to firmly adhere the flexible conductive element and the conductive silver paste.

The invention also provides an electric appliance which comprises the flexible heating film with high temperature resistance. Therefore, the electric appliance of the invention has good temperature resistance and can keep long service life at higher working temperature.

Drawings

Fig. 1 is a schematic perspective view of embodiment 1 of the present invention;

FIG. 2 is a state diagram of a product after a life test of comparative example 1 of the present invention;

FIG. 3 is a state diagram of a product after a life test of comparative example 2 of the present invention;

FIG. 4 is a state diagram of a product after a life test of comparative example 3 of the present invention;

fig. 5 is a state diagram of a product after a life test of example 1 of the present invention.

In the figure:

1. a heating film body; 2. conductive silver paste; 3. a flexible conductive element.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

Example 1:

referring to the attached figure 1, the embodiment is a flexible heating film with high temperature resistance, which includes a heating film body 1, an electrode part is arranged in a partial area of the heating film body 1, and the electrode part includes aconductive silver paste 2 capable of being electrically conducted with the heating film body 1 and a flexibleconductive element 3 which is attached to one side of theconductive silver paste 2 away from the heating film body 1.

The heating film body 1 of the invention can adopt a carbon nano tube heating film, a graphene heating film or any other heating film

Some heating films. The temperature resistance of the flexibleconductive element 3 is not lower than 300 ℃, the long-term temperature resistance is not lower than 250 ℃, and the temperature resistance is preferably higher than that of silver paste. The flexibleconductive element 3 of the present invention is a flexible conductive film, and the square resistance value thereof should be less than 5 Ω, and the thickness thereof should be less than 50 μm.

The flexibleconductive element 3 of the embodiment adopts a carbon nano tube heating film, the long-term temperature resistance of the carbon nano tube heating film can reach 300 ℃, the square resistance value is 1-3 omega, and the thickness is less than 10 mu m. The flexibleconductive element 3 can also be other heating elements with higher temperature resistance and good flexibility. Therefore, the flexibleconductive element 3 can be well attached to theconductive silver paste 2, and when the heating film body 1 is heated, even if theconductive silver paste 2 is heated and is partially cracked, the flexibleconductive element 3 is arranged, so that the electric conduction effect can be ensured, and the flexible heating film disclosed by the invention has higher temperature resistance.

The electrode part of the invention can be arranged in any area of the heating film body 1, such as the edge of the heating film body 1 and/or the middle part of the heating film body 1, and the two ends of the electrode part extend to the edge of the heating film body 1.

The flexible heating film of the embodiment is prepared according to the following method:

firstly, screen printing theconductive silver paste 2 on the heating film body 1 corresponding to the area where the electrode needs to be arranged, wherein the thickness of the screen is 1-50 μm, and preferably 5-15 μm.

Before theconductive silver paste 2 is not cured, the flexibleconductive element 3 is attached to the surface of theconductive silver paste 2;

curing theconductive silver paste 2 to firmly bond the flexibleconductive element 3 and theconductive silver paste 2, wherein the curing temperature is preferably not more than 200 ℃, for example, the curing can be performed at 120 ℃ for 5-10 minutes, or the curing can be performed at less than 200 ℃ for a short time.

The flexible heating film of the embodiment can also be prepared according to the following steps:

printingconductive silver paste 2 on a flexibleconductive element 3;

before theconductive silver paste 2 is not cured, the flexible conductive element printed with the conductive silver paste is attached to the heating film body;

solidifying the conductive silver paste to firmly adhere the flexible conductive element and the conductive silver paste. The curing conditions were the same as in the preparation method described above.

Comparative example 1:

the results of the lifetime test of the electrode portion of the heat generating film of example 1 using theconductive silver paste 2 directly without providing the flexible heat generating film are shown in fig. 2.

Comparative example 2:

fig. 3 shows the results of the lifetime test performed on the electrode unit of example 1 by replacing it with an adhesive copper foil.

Comparative example 3:

the electrode portion of example 1 was replaced with silver paste and double-conductive copper foil, and a life test was performed thereon, and the result is shown in fig. 4.

The flexible heat-generating film of example 1 was compared with the heat-generating films of comparative examples 1 and 2, and the results are shown in table 1: the conductivity, the temperature resistance and the life test performance of the flexible heating film are compared, and the product state of the flexible heating film in the example 1 after the life test is shown in fig. 5, so that the flexible heating film in the example 1 can keep continuous working for 300 hours at 230 ℃ without perforation, scorching and other abnormal phenomena. The heating film of the comparative example 1 has the phenomenon of scorching after being treated for 24 hours at 200 ℃; the heating film of the comparative example 2 is burnt in a larger area after being treated for 50 hours at 200 ℃; the heat-generating film of comparative example 3 was burnt in a large area after 30 hours of treatment at 200 ℃.

Table 1 comparison of performance tests of example 1 with comparative examples 1, 2 and 3

	Example 1	Comparative example 1	Comparative example 2	Comparative example 3
					Thickness of	45±2μm	10±2μm	100±2μm	110±2μm
Conductivity of electricity	9±1mΩ	48±2mΩ	2.8±0.5mΩ	2.6±0.5mΩ/
					Temperature resistance	250-300℃	200℃	200℃	200℃
Life span	230℃/300H	200℃/24H	200℃/50H	200℃/30H

Therefore, the flexible heating film of the embodiment 1 can keep long-time working stability at a relative high temperature, and has no abnormal phenomena such as scorching, and the flexible heating film of the embodiment 1 has a thinner overall thickness and high temperature resistance, and can meet the long-term heating requirement of a higher heating temperature.

Example two:

the present embodiment is an electrical appliance, which includes the flexible heat generating film with high temperature resistance of the first embodiment. The electric appliances of the present embodiment include, but are not limited to, electric heating plates, electric baking pans, electric ovens, electric rice cookers, electric frying pans, and the like.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims (7)

1. The utility model provides a flexible heating film with high temperature resistance, includes the heating film body, its characterized in that the subregion of heating film body is provided with electrode portion, electrode portion including can with the electrically conductive silver thick liquid of heating film body electric conductance and with keeping away from of electrically conductive silver thick liquid the flexible conductive element that sets up of laminating mutually in heating film body one side.

2. The flexible heat generating film with high temperature resistance according to claim 1, wherein the flexible conductive element is a flexible conductive film.

3. The flexible heat generating film with high temperature resistance as claimed in claim 2, wherein the flexible conductive element is a carbon nanotube conductive film.

4. A preparation method of a flexible heating film with high temperature resistance is characterized by comprising the following steps:

printing conductive silver paste on partial area of the heating film body;

before the conductive silver paste is not cured, attaching the flexible conductive element to the surface of the conductive silver paste;

solidifying the conductive silver paste to firmly adhere the flexible conductive element and the conductive silver paste.

5. The method for preparing a flexible thermal film with high temperature resistance according to claim 4, wherein in the step (r), the conductive silver paste is printed on the thermal film body through a silk screen, and the thickness of the silk screen is 1-50 μm.

6. A preparation method of a flexible heating film with high temperature resistance is characterized by comprising the following steps:

printing conductive silver paste on a flexible conductive element;

before the conductive silver paste is not cured, the flexible conductive element printed with the conductive silver paste is attached to the heating film body;

solidifying the conductive silver paste to firmly adhere the flexible conductive element and the conductive silver paste.

7. An electric appliance characterized by comprising the flexible heat generating film having high temperature resistance claimed in any one of claims 1 to 6.

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