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Electrothermal film with PTC effect and preparation method

A technology of electric heating film and effect, applied in electric heating devices, ohmic resistance heating, ohmic resistance heating parts and other directions, can solve the problems of high development cost and long development cycle

Active Publication Date: 2019-04-09
BEIJING AINY ELE MECHANICAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when using this kind of technology to develop self-limiting temperature electric heating film, when the realization temperature of PTC effect is different, it can only be realized by replacing the support material of the heating element, and the change of support material will lead to the change of processing parameters and even processing equipment, making Long product development cycle and high development cost

Method used

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  • Electrothermal film with PTC effect and preparation method
  • Electrothermal film with PTC effect and preparation method
  • Electrothermal film with PTC effect and preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The present invention provides a method for preparing the above electrothermal film, comprising the following steps:

[0036] Prepare the third component particles containing conductive filler: mix the conductive filler and the third component at a weight ratio of 40-90:30-60, add to a screw extruder to melt and extrude, cool, granulate, and pulverize, That is, the third component particles containing conductive fillers;

[0037]Specifically, carbon black is mixed with the third component in a ratio of 40-90:30-60 by weight, and added to the screw extruder, and the temperature settings in each zone of the screw extruder should be higher than the melting point of the third component. -30°C. Then carry out melt extruding, through the steps of cooling and granulation to obtain slices containing carbon black, then pulverize the slices with a pulverizer, and use multi-layer sieves with different meshes to sieve to obtain carbon black-containing and The third component part...

Embodiment 1

[0048] Preparation of third component microparticles containing carbon black

[0049] The carbon black used had an average diameter of 15 nm. Mix 600 grams of carbon black with 400 grams of microcrystalline wax powder and add it to a twin-screw extruder with 6 temperature zones. ℃, 82℃. The screw speed is adjusted according to the screw outlet pressure, and the outlet pressure is kept at 5-10Mpa. The screw extruder is directly connected to the cooling granulator, and after granulation, slices containing carbon black are obtained. The slices were pulverized with an electric pulverizer, and sieved by a sieve machine with three layers of screens, the screens were 50 mesh, 200 mesh and 300 mesh respectively, and the third component particles with a mesh number of 200-300 mesh were collected.

[0050] Preparation of conductive carbon paste

[0051] In the reactor equipped with stirring device, add 200 grams of carbon black-containing particles prepared in the first step, the si...

Embodiment 2

[0056] The difference from Example 1 is that when preparing the third component particles containing carbon black, the third component used is PMMA; the temperature settings of each zone of the screw extruder are: 95°C, 100°C, 100°C, 100°C °C, 100 °C, 97 °C.

[0057] All the other steps are the same as in Example 1.

[0058] The finished product in this embodiment is subjected to a performance test, and the results of the power-on test are shown in the attached image 3 .

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Abstract

The invention provides an electrothermal film with a PTC (positive temperature coefficient) effect and a preparation method thereof. The electrothermal film comprises a conductive filler, a support material and a third component; the conductive filler is filled in the third component, and the thermal expansion coefficient of the third component is larger than the thermal expansion coefficient of the support material. According to the film and the method in the invention, the third component is adjusted and combined, and the electrothermal film with the PTC effect of different temperatures is designed in the electrothermal film of the same support material, so that the problems that exist in the prior art due to the fact that volume thermal expansion is provided by means of a high-molecularsupport material are effectively solved, the product development process is shortened, and the development cost is reduced.

Description

technical field [0001] The invention relates to the technical field of electrothermal materials, in particular to an electrothermal film with PTC effect and a preparation method thereof. Background technique [0002] The PTC effect refers to the positive temperature coefficient effect, which means that when the temperature of the material rises to a certain temperature, the resistivity of the material will increase rapidly, and the material will change from a conductor to a poor conductor or even an insulator. Because of this characteristic, materials with PTC effect are often used to design and prepare electrothermal materials that require self-limiting temperature under the condition of electric heating. After heating to a certain temperature, this electrothermal material will increase the heating power due to resistance. Reduce to achieve automatic temperature limit effect. [0003] The polymer-based electrothermal film is generally prepared by adding conductive particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/34H05B3/06
CPCH05B3/06H05B3/34Y02B30/00
Inventor 刘戈张继承
Owner BEIJING AINY ELE MECHANICAL
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