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Electric heating film and preparation method thereof

An electric heating film and insulating film technology, applied in the field of planar conductors and their preparation, to achieve the effects of low power variation, reduced production time, and stable power

Active Publication Date: 2010-10-27
刘忠耀
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention proposes an electric heating film and its preparation method, which greatly prolongs the service life of the product and solves the problem of stable product performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An electric heating film, which includes an adhesive and mixed powder mixed together, and a glass fiber cloth carrying the adhesive and mixed powder, which is a conductive base film made of the following raw materials: the adhesive is polyimide resin and mixed powder; the mixed powder includes conductive carbon black and graphite powder, the particle diameter of conductive carbon black is 10-100nm; the particle diameter of graphite powder is 1-10 μm; take the following weight materials: graphite powder 4.0kg; conductive carbon Black 4.0kg; polyimide resin 100kg; Al with a particle size of 10-100nm 2 o 3 powder 45g; dimethylacetamide 90kg;

[0020] A method for preparing an electric heating film, comprising the following steps: ①, first mixing conductive carbon black and graphite powder to obtain mixed powder, then mixing polyimide resin and mixed powder, and adding a diluent to dilute; ②, after The grinder moves continuously at a constant speed at a stirring speed of ...

Embodiment 2

[0024] The similarities between this embodiment and Embodiment 1 will not be repeated, and the difference is that the following weight materials are taken: 3.0kg of graphite powder; 3.6kg of conductive carbon black; 100kg of polyimide resin; 25g of Ag powder; Acetamide 90kg;

[0025]Repeating the steps of Example 1, the average resistance per unit area of ​​the obtained conductor was 2500Ω±10%. The conductor implanted with conductive aluminum foil as an electrode is wrapped with PET film on the upper and lower surfaces of the electric heating film at a temperature of 110°C±10% by a laminating machine to make an electric heating film with a thickness of 0.6mm. According to the provisions of Chapter 22 of GB / T 7287-2008 national standard, the simulated accelerated aging test method is used for life (aging) test. The conclusion of the test: ①, the service life of the product reaches more than 30,000 hours. ②. The power is stable, and the power change is within 2% after the accel...

Embodiment 3

[0027] The same parts of this embodiment and embodiment 1 will not be repeated, and the difference is that the following weight materials are taken: graphite powder 8kg; conductive carbon black 9.6kg; polyimide resin 100kg; TiO 2 powder 80g; dimethylacetamide 90kg;

[0028] After mixing the graphite powder and conductive carbon black evenly, the resin material is diluted with a diluent and then added to the above raw materials, and the grinding machine is continuously and uniformly moved at a stirring speed of 250rpm-500rpm for 60 minutes, and the diluent dimethylacetamide is added in the middle Adjust the viscosity between 200-300mmpa.s and mix into a gel-like mixture. Apply the jelly-like mixture on the glass fiber cloth through a coating machine, and after baking, the jelly-like mixture is immersed and solidified on the glass fiber cloth to form an electric heating film; the temperature during the above baking process is from 100°C to 300°C Gradually rising, the glue-coate...

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Abstract

The invention discloses an electric heating film which comprises an adhesive agent and mixed powder mixed together as well as glass fiber cloth for bearing the adhesive agent and the mixed powder. The electric heating film is characterized by comprising the following components in parts by weight: 100 parts of polyimide resin as the adhesive agent, 4-30 parts of the mixed powder and 0-2 parts of stabilizer, wherein the mixed powder comprises conductive carbon black and graphite powder, and the weight ratio of the graphite powder to the conductive carbon black is 1: (0.8-1.25). A preparation method of the electric heating film comprises the following steps of: firstly, mixing the conductive carbon black with the graphite powder according to the weight ratio of 1: (0.8-1.25) to obtain the mixed powder, mixing the polyimide resin with the mixed powder according to the weight ratio of 1: (0.04-0.30), and adding a thinning agent for diluting; secondly, grinding for 10-60 minutes by using a grinding machine to obtain a colloidal mixture; and thirdly, coating the colloidal mixture on the glass fiber cloth by using a coating machine, roasting the colloidal mixture so that the colloidal mixture is immersed in and cured on the glass fiber cloth to form the electric heating film. The invention is mainly used for manufacturing the electric heating film.

Description

technical field [0001] The invention relates to a high-temperature-resistant planar conductor (or conductive material) and a preparation method thereof, in particular to an electric heating film and a preparation method thereof. Background technique [0002] Conductive materials widely used at present can be divided into linear conductive materials (such as wire conductors) and planar conductors (such as carbon crystal film conductors, carbon fiber film conductors) according to their shapes. Electric heating materials are generally developed in the direction of energy saving and long service life. However, the electrothermal conversion efficiency of traditional electric heating materials (generally such as metal materials) is low, generally about 70%, but the planar conductor solves the problem of low electrothermal conversion efficiency. 5-10 times that of the body, and the same heating effect is at least 30% more energy-saving than metal wire. In recent years, people hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/14H05B3/34H01B1/24
Inventor 刘忠耀
Owner 刘忠耀
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