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36V and below low-voltage driven PTC electrothermal film and preparation method thereof

An electrothermal film and low-voltage technology, which is applied in the field of electrothermal material preparation, can solve problems such as potential safety hazards, electric leakage, electric shock, and easy formation of air bubbles, and achieve the effects of improving safety performance, prolonging service life, and improving stability

Inactive Publication Date: 2019-11-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using the above method to prepare PTC electric heating film, due to the difference in thermal expansion coefficient between the heating layer and the base material, air bubbles are easily formed between the heating layer and the base material during the repeated heating-cooling process, causing the heating layer to fall off; at the same time, repeated heating-cooling causes the heating layer It is easy to produce tiny cracks, so that the resistance value gradually increases during use, and the electric heating power attenuation is more obvious
[0004] In addition, the PTC electric heating film currently used in the market is connected to the household voltage of 220V. Due to its own problems or installation problems, the metal part of the connecting wire is often exposed to the outside of the PTC electric heating film, resulting in electric leakage and electric shock accidents, which poses a safety hazard.
[0005] The PTC electric heating film driven by low voltage requires a relatively low square resistance, and due to the limitation of the conductivity of the material, the square resistance of the existing PTC electric heating film is generally 20000-30000 ohms / sq, even if the parallel scheme is used to reduce the square resistance. It is difficult to meet the requirements of low voltage drive

Method used

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  • 36V and below low-voltage driven PTC electrothermal film and preparation method thereof
  • 36V and below low-voltage driven PTC electrothermal film and preparation method thereof
  • 36V and below low-voltage driven PTC electrothermal film and preparation method thereof

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preparation example Construction

[0032] The PTC electrothermal film preparation method driven by 36V low voltage of the present invention comprises the following steps:

[0033] 1. Preparation of graphene microchip-filled PTC conductive particles: Weigh 1.5-5 parts of graphene microchips, 63.5-97 parts of polyethylene resin, 1.5-31.5 parts of polymethyl methacrylate, and place in a high-speed mixer Stir at medium and high speed for 20-25 minutes to obtain the graphene microflake composition; use an extruder to melt and extrude, water-cool at room temperature, and then granulate through a cutting machine to obtain graphene microflake-filled PTC conductive particles;

[0034] 2. Preparation of heating layer 2: Use a casting film forming machine to cast the conductive particles prepared in step 1 at 120-150°C to form a film, and wind up to obtain a graphene microchip-filled PTC heating element 5 with a thickness of 30-150°C. 60 μm, and then two conductive copper strips 4 are hot-compressed in parallel at 120-150...

Embodiment 1

[0040] 1. Preparation of graphene microflake-filled PTC conductive particles: Weigh 0.2kg of graphene microflakes, 7kg of low-density polyethylene resin, 1kg of polymethyl methacrylate, and stir in a high-speed mixer for 20 minutes to obtain a mixture;

[0041] The extruder melts the mixture and extrudes and spins it, and after it is cooled in water, it is pelletized by a cutting machine to obtain graphene microflake-filled PTC conductive particles;

[0042]2. Preparation of heating layer 2: using a casting film forming machine, the conductive particles prepared in step 1 were cast into a film at 130°C, and rolled to obtain a graphene microchip-filled PTC heating element 5 with a thickness of 60 μm, and then in The prepared graphene microchip-filled PTC heating element 5 is parallel hot-pressed at 130°C on both sides and combined with two conductive copper strips 4 to obtain the heating layer 2;

[0043] 3. Composite insulating layer: thermally compound the upper insulating la...

Embodiment 2

[0046] 1. Prepare graphene microchip-filled PTC conductive particles: weigh 0.3kg of graphene microchip, 7kg of low-density polyethylene resin, 1kg of polymethyl methacrylate, and stir in a high-speed mixer for 20 minutes to obtain a mixture;

[0047] The extruder melts the mixture and extrudes and spins it, and after it is cooled in water, it is pelletized by a cutting machine to obtain graphene microflake-filled PTC conductive particles;

[0048] 2. Preparation of heating layer 2: Use a casting film forming machine to cast the conductive particles prepared in step 1 at 150°C to form a film, and wind up to obtain a graphene microchip-filled PTC heating element 5 with a thickness of 50 μm, and then in The prepared graphene microchip-filled PTC heating element 5 is parallel hot-pressed at 130°C on both sides and combined with two conductive copper strips 4 to obtain the heating layer 2;

[0049] 3. Composite insulating layer: thermally compound the upper insulating layer 1 and ...

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Abstract

The invention belongs to the technical field of electrothermal material preparation, and particularly relates to a 36V and below low-voltage driven PTC electrothermal film and a preparation method thereof. The electrothermal film is composed of an upper insulating layer, a lower insulating layer and a polymer PTC heating layer. The polymer PTC heating layer is composed of a graphene microchip filling type PTC heating body and a conductive copper bar, and the PTC heating body is prepared from graphene microchips, polyethylene resin and polymethyl methacrylate. The electrothermal film has the advantages of low starting resistance, low power attenuation rate after long-term use, stable and reliable PTC electrothermal function and the like. The preparation method provided by the invention comprises the following steps: preparing the graphene microchip filling type PTC heating body, and carrying out calendering molding on the upper insulating layer, the lower insulating layer, the graphenemicrochip filling type PTC heating body and the conductive copper bar. The method is simple in technological process and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of electrothermal material preparation, and in particular relates to a low-voltage driven PTC electrothermal film and a preparation method thereof. Background technique [0002] Inorganic or organic materials with a positive temperature coefficient of resistance (positive temperature coefficient, PTC) effect can be used to make self-controlling intelligent electric heating film. The PTC function can prevent local abnormal overheating, automatically control the change of current with temperature, and effectively control power consumption. . The manufacturing process of the PTC electrothermal film in the prior art is coating and screen printing on the surface of the insulating substrate. Chinese patent application CN 201310398903.5 discloses "PTC composite material heating film and its preparation method and application", the PTC composite slurry is coated on the epoxy resin prepreg, and then a layer of epoxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/12H05B3/34
CPCH05B3/12H05B3/34
Inventor 储富强陶永新王刚郭冰袁超
Owner CHANGZHOU UNIV