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Composite carbon element crystal electrothermal material and method for making same

A technology of electric heating materials and composite carbon, which is applied in the direction of heating element materials, etc., can solve the problems that affect the popularization and application of carbon fiber electric heating materials, the resistance value is not stable enough, and the working life is not long, so as to achieve good rigidity, constant and balanced temperature rise, and resistance value stable and even effect

Active Publication Date: 2007-12-05
BEL AIR JIANGSU ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practice has proved that single-component carbon fiber still has certain shortcomings as an electric heater material, such as: in the long-term high-temperature working state, the resistance value is not stable enough, resulting in a short working life; Power is more difficult to control, etc.
Therefore, to a certain extent, it has affected the deeper promotion and application of carbon fiber electric heating materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: (1) Take pitch-based carbon fibers, mix the carbon fibers through a 400-mesh sieve with those with fiber lengths of 5 and 12 mm, and weigh 20 kilograms, then heat-treat the raw materials at a temperature of 1200 ° C. Wait for the carbon fiber to form a floc, and then carry out crushing treatment, so that the volume density of the carbon fiber is 0.01-0.03g / cm 3 , the fiber length is 30-130um, and the fiber thickness is mostly below 0.6um; (2) add 30 kilograms of polyamide resin and acrylonitrile-ethylene-diene and polyethylene, polycarbonate mixed fat in the above-mentioned carbon fiber, 10 30 kilograms of phospholipid plasticizers of kilograms, 30 kilograms of graphite powders, 6.5 kilograms of far-infrared emitters, 3.5 kilograms of band regulators and band stabilizers, fully mixed with a Heinz mixer; (3) the above-mentioned mixture is placed in a graphite crucible for Compress to make the bulk density 0.7g / cm 3 , and cover it with a graphite platen for co...

Embodiment 2

[0014] Example 2: (1) Take polyacrylonitrile-based carbon fibers, mix the carbon fibers through a 450-mesh sieve with those with a fiber length of 6 and 8 mm, and weigh 30 kg, then heat-treat the raw material, and the temperature is controlled at 1500 ° C , wait for the carbon fiber to form a floc, and then crush it, so that the measured bulk density of the carbon fiber is 0.01-0.03g / cm 3 , the fiber length is 30-130um, and the fiber thickness is mostly below 0.6um; (2) Add 40 kg of polyamide resin, polytetrafluoroethylene resin (PTFE), polyphenylene ether (PPO) resin to the above carbon fiber Mixed fat, 15 kilograms of phosphite plasticizers, 40 kilograms of graphite powder, 10 kilograms of far-infrared emitters, 5 kilograms of band regulators and band stabilizers, fully mixed using a Heinz mixer; (3) placing the above mixture Compress in a graphite crucible so that the bulk density is 0.85g / cm 3 , and cover it with a graphite platen for compression, and then extrude it into...

Embodiment 3

[0015] Embodiment 3: (1) get the viscose-based carbon fiber, mix the carbon fiber through a 500-mesh sieve with the fiber length of 5.12 mm, and the weight is 25 kg. Then the raw material is heat-treated, and the temperature is controlled at 1300 ° C. Wait for the carbon fiber to form a floc, and then crush it, so that the measured bulk density of the carbon fiber is 0.01-0.03g / cm 3 , the fiber length is 30-130um, and the fiber thickness is mostly below 0.6um (2) Add 35 kg of polyamide resin, phenolic resin (PF), polyvinyl fluoride (PVF) mixed fat to the above carbon fiber, 12 kg Phosphate ester plasticizer, 35 kilograms of graphite powder, 13 kilograms of far-infrared emitters, 7 kilograms of band adjuster and band stabilizer, fully mixed by Heinz mixer; (3) the above mixture is placed in a graphite crucible and compressed , so that the bulk density is 1.0g / cm 3 , and cover it with a graphite platen for compression, and then extrude it into products in the shape of round rod...

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Abstract

The present invention provides a composite carbon crystal electro thermal material and its preparation methods. This composite carbon crystal material is mainly composed of carbon fiber, resins, plasticizers, graphite and additives. Percentages of the weight of each component are 20-30: 30-40: 10-15: 30-40: 10-20. The method of this invention includes the following steps. It would first implement fiber length pretreatment of short-cut carbon fiber material, and then implement heat treatment and crushing treatment, and then fully mixed all the components according to the referred weight ratio, and then squeeze the above mixture into all the required shape. In the dry inert gas environment or the vacuum environment, it would produced high-quality carbon composite crystal electro thermal material that has high heat value, large exchange rate of electric heating, good effect of energy-saving, good mechanical strength and long service life, with the maintenance a certain level of warming up speed, temperature increasing time, and high-temperature roasting. It has a large span of temperature, and could be made into different forms of composite carbon crystal heating elements, so it could be flexibly applied in various types of heating devices.

Description

technical field [0001] The invention relates to electrothermal material technology, in particular to a composite carbon crystal electrothermal material and a preparation method thereof. Background technique [0002] For a long time, there are many kinds of electric heater materials used for heating, which can be mainly attributed to: metal wire materials, PTC ceramic or plastic materials, silicon carbide, carbon fiber, etc. Among them, carbon fiber material has become a highly respected heating electric heating material because of its superior properties such as large-area uniform heating, heat dissipation, high electrothermal conversion efficiency, strong far-infrared radiation, and significant energy-saving effect. The carbon fiber is widely used as an electrothermal material in heating devices in aerospace, cutting-edge scientific research, and other industrial and agricultural fields. In recent years, carbon fiber materials have also been developed and applied in civil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/14
Inventor 方灿榆
Owner BEL AIR JIANGSU ELECTRIC
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