CN100518415C - Heating unit of infrared electric heating plate and producing method - Google Patents
Heating unit of infrared electric heating plate and producing method Download PDFInfo
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- CN100518415C CN100518415C CNB2006101351015A CN200610135101A CN100518415C CN 100518415 C CN100518415 C CN 100518415C CN B2006101351015 A CNB2006101351015 A CN B2006101351015A CN 200610135101 A CN200610135101 A CN 200610135101A CN 100518415 C CN100518415 C CN 100518415C
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Abstract
The invention relates to a heating unit of an infrared electric hot plate and a preparation method thereof. The infrared electric hot plate is made up of conductive material ranging from 1 percent to 30 percent, heat conduction material ranging from 30 percent to 92 percent, polymer adhesive ranging from 5 percent to 50 percent and toughener ranging from 2 percent to 10 percent.The preparation method is as followings: the front part of the heating unit is made through thermofixation or hot press molding, then under the protection of nitrogen or inert gas, the front part is carbonized for 3 to 12 hours at a high temperature ranging from 900 DEG C to 2200 DEGC, thus obtaining the heating unit of an infrared electric hot plate. The preparation is simple with low cost.The infrared electric hot plate, using 6-380V alternating or direct currents, can directly produce infrared radiation with high efficiency of energy conversion. Being a heating unit, the infrared electric hot plate can produce infrared radiation both on the upper surface and the lower surface dispensing with a substrate, which greatly increases radiation area and improves heating efficiency. As a novel infrared heating unit material, the invention not only can be extensively applied to technics such as heating, baking and heat treatment in agriculture and industry, but also can be applied to medical care and heating in winter, etc., with important application value and extensive application prospect.
Description
Technical field:
The present invention relates to the composition and the technology of preparing of functional heating unit of infrared electric heating plate material, particularly a kind of composition and preparation method with heating unit of infrared electric heating plate material of monolithic conductive infrared radiation.
Background technology:
Along with a large amount of consumption of the mankind to fossil energy, the deposit of fossil energy is day by day exhausted, and environmental pollution is on the rise, the mode of heating of a kind of cleaning of an urgent demand, and can utilize the energy expeditiously.Infrared heating technique is exactly new results in the technical field of heating in recent years.Infrared light supply energy transformation ratio height, the suitable object of the wavelength of radiation absorbs, and power is big, and fire safety, so Infrared Radiation Heating Technology are that a kind of perfect energy sources is utilized mode.
Infrared radiation heating has purposes widely in medical treatment, industrial and agricultural production and daily life.Well-known people is an infrared emitter, also is infrared absorber.The overwhelming majority of human body is a carbohydrate, and water has accounted for the about 70% of human body, thus human body to ultrared absorption spectra near water, at infrared band and middle-infrared band continuous absorption is arranged all.Generally speaking, radiation wavelength is long more, and absorption of human body is strong more, and it is shallow more to enter the degree of depth of human body.0.76-2.5 the short infrared ray radiation human body of μ m approximately can arrive subcutaneous 1cm.Short-wave infrared can directly be penetrated into corium hypodermis and muscle, and heating blood causes blood vessel dilatation, accelerates blood circulation.LONG WAVE INFRARED can directly arrive at corium, can promote the microcirculation of blood vessel tip greatly.Infrared radiation also stimulates nerve endings, meridian point etc., and passes the signal along to other positions and nerve center, evokes the pulse of whole body and accelerates, and blood pressure reduces, metabolism is active and immunity strengthens.This effect can also be after infrared radiation stops, the continuity long duration.
Use the infrared radiation object, atom, the molecule of nearly surf zone just absorb energy from electromagnetic wave, the aggravation motion; Heat energy also can raise whole object temperature to internal delivery simultaneously.So the thermal effect of infrared radiation is better than other wave band, the utilization Infrared Radiation Heating Technology, only the short several hrs of need just can be grain heat-drying, and flavor does not change colour.Therefore, the infrared radiation heating baking is energy savings greatly, improves product quality and production efficiency.Not only be used for now the paint drying of appliance shells such as processed such as food, medicine, cotton wool, chemical fiber yarn, cloth, timber, articles made of bamboo and refrigerator, washing machine, also can promote to numerous industries such as medical herding, breed, chemical industry, automobile and papermaking, printing, electronics.
The present source of infrared radiation generally is made of heater (thermal source), infrared coating and matrix and relevant annex.The effect of heater is to provide enough heat energy to infrared coating, to guarantee the necessary temperature of radiating layer normal transmission infrared ray.What adopt usually is electrothermal, gas combustion heat and steam heat.The function of infrared coating is to launch required infrared ray at a certain temperature.Coating material commonly used has titanium dioxide, manganese dioxide, silicon dioxide and carborundum etc.Matrix is used for supporting thermal source and coating.Infrared radiant material is coated in the surface of matrix, forms coating.The heat energy that thermal source sends is delivered to infrared radiating coating by matrix, gives off infrared ray at coating surface.From its operation principle as can be known, heat energy will just can be delivered to infrared coating by matrix, and this mode is easy to the produce power loss, and normally earlier electric energy is changed into heat energy, both by electric heating, again by heat to infrared radiation, so electric energy to convert the infrared radiation energy efficiency to lower.
Summary of the invention:
The purpose of this invention is to provide a kind of heating unit of infrared electric heating plate and preparation method thereof, to improve the infrared radiation conversion efficiency of electric energy.This infrared electric heating plate integrates heater, matrix and infrared coating, can be converted into infrared energy to electric energy, improves the heat efficiency greatly; This heating unit of infrared electric heating plate also has good materials processing performance and serviceability.
Technical scheme of the present invention is:
The invention provides a kind of heating unit of infrared electric heating plate, it is made of electric conducting material, heat conducting material, polymer bonding agent and flexibilizer.
The used electric conducting material of heating unit of infrared electric heating plate of the present invention preparation can be that (granularity is 20～60nm) and carbon nano-tube (single wall, double-walled, multi-walled carbon nano-tubes, one or more of the material such as grade of diameter 1.4nm～100nm) for crystalline flake graphite (granularity is 25～50 μ m), conductive black.The weight content of electric conducting material can be at 1%-30%, and optimum range is at 5%-20%.
The used heat conducting material of heating unit of infrared electric heating plate of the present invention preparation can be in carborundum (granularity is 4～25 μ m), boride (granularity is 5～30 μ m) and the silicon dioxide (granularity is 5～30 μ m) one or more.The weight content of heat conducting material can be at 92%-30%, and optimum range is at 80%-50%.
The used polymer bonding agent of heating unit of infrared electric heating plate of the present invention's preparation can be one or more compound formations in the polymer such as epoxy resin, polyvinyl chloride, phenolic resins and polyethylene.The weight content of polymer bonding agent can be at 5%-50%, and optimum range is at 10%-30%.
The used flexibilizer of heating unit of infrared electric heating plate of the present invention's preparation is ethanol, glycerine or polyvinyl alcohol etc.The weight content of flexibilizer can be at 2%-10%, and optimum range is at 2%-5%.
The preparation of heating unit of infrared electric heating plate among the present invention: at the heater presoma, when adopting thermosetting resin, with the method for being heating and curing; When adopting thermoplastic resin, adopt pressure sintering.Take off after naturally cooling to room temperature, obtain the heating unit of infrared electric heating plate presoma; Subsequently to presoma under nitrogen or inert gas shielding, 900-2200 ℃ high temperature carbonization 3-12 hour, obtain heating unit of infrared electric heating plate.
Advantage of the present invention:
1, the heating unit of infrared electric heating plate that adopts the present invention to obtain integrates heater, infrared coating and matrix, and this infrared electric heating plate can use 6-380V AC and DC electricity, directly produces infrared radiation, the energy conversion efficiency height.
2, infrared electric heating plate of the present invention self is a heater, without matrix, the heater upper and lower surface can produce infrared radiation, increased swept area greatly, having improved heating efficiency, is a class new infrared heating material, not only can be widely used in the technologies such as heating, oven dry and heat treatment of industrial or agricultural, but also can be used for fields such as medical treatment and warming, have important Practical significance.
3, preparation technology of the present invention is simple, and is with low cost, easy to implement.
Description of drawings
Fig. 1. heating unit of infrared electric heating plate preparation flow schematic diagram.
Fig. 2. the spectral radiance curve of the heating unit of infrared electric heating plate of embodiment 1 preparation.
Fig. 3. the spectral radiance curve of the heating unit of infrared electric heating plate of embodiment 2 preparations.
Fig. 4. the spectral radiance curve of the heating unit of infrared electric heating plate of embodiment 3 preparations.
Fig. 5. the spectral radiance curve of the heating unit of infrared electric heating plate of embodiment 4 preparations.
Embodiment
The preparation process of heating unit of infrared electric heating plate of the present invention is as follows:
1, the preparation of infrared electric heating plate presoma
When adopting thermosetting resin to do bonding agent, with the method for being heating and curing: at first electric conducting material and heat conducting material are made uniform mixture in mixer, join subsequently in the bonding agent that is stirring, after stirring, add flexibilizer, continue to stir and make uniform mixture.Said mixture is laminated on twin-roll machine, and then on vulcanizing press, 65-150 ℃ solidified 0.5-5 hour down, obtained the infrared electric heating plate presoma after naturally cooling to room temperature.
When adopting thermoplastic resin, adopt pressure sintering: at first electric conducting material and heat conducting material are made uniform mixture in mixer, join subsequently in the bonding agent, after stirring again, add flexibilizer, continue to stir and make uniform mixture.With said mixture on vulcanizing press, 150-300.℃, laminated in hot pressing 10-30 minute under the 5-20MPa, obtain the infrared electric heating plate presoma after naturally cooling to room temperature.
2, the preparation of heating unit of infrared electric heating plate
With above-mentioned presoma under nitrogen or inert gas shielding 900-2200 ℃ charing 3-12 hour, obtain heating unit of infrared electric heating plate.The concrete preparation flow of heating unit of infrared electric heating plate is seen Fig. 1.
Embodiment 1 crystalline flake graphite (granularity is 45 μ m), carborundum (granularity is 15 μ m), epoxy resin, ethanol are 2.5: 88: 7.5 according to weight ratio: 2 mix, after making the 1mm thin slice on the twin-roll machine, 65 ℃ were heating and curing 3 hours on vulcanizing press, obtained the infrared electric heating plate presoma after naturally cooling to room temperature.With the charing 6 hours under 900 ℃, blanket of nitrogen of above-mentioned infrared electric heating plate presoma, obtain heating unit of infrared electric heating plate.It is 0.49w/cm that infra-red emission is measured its surperficial maximum spectral radiance
2/ sr/m, corresponding wavelength is 2.41 μ m, heating unit of infrared electric heating plate maximum radiation temperature is 929.3 ℃ of (see figure 2)s.
Embodiment 3 multi-walled carbon nano-tubes (average diameter is 60nm), boron nitride (granularity is 15 μ m), acrylic resin and polyvinyl alcohol were by weight 1: 10: 8: 1 mixes, then on vulcanizing press, 1mm thickness sheet was made in hot pressing in 15 minutes under 160 ℃, 15MPa, obtained the infrared electric heating plate presoma after naturally cooling to room temperature.With the charing 3 hours under 900 ℃, blanket of nitrogen of above-mentioned infrared electric heating plate presoma, obtain infrared electric heating plate.It is 1.53w/cm that infra-red emission is measured its maximum spectral radiance of surface
2/ sr/m, corresponding wavelength is 2.22 μ m, heating unit of infrared electric heating plate maximum radiation temperature is 1032.0 ℃ of (see figure 4)s.
Embodiment 4 double-walled carbon nano-tubes (average diameter is 1.9nm) and conductive black (granularity is 60nm) mixture (weight ratio 1: 1), boron nitride (granularity is 25 μ m) and silicon dioxide (granularity is 20 μ m) mixture (weight ratio 1: 2), Corvic and glycerine were by weight 6: 10: 3: 1 mixes, then on vulcanizing press, 1mm thickness sheet was made in hot pressing in 30 minutes under 180 ℃, 10MPa, obtained the infrared electric heating plate presoma after naturally cooling to room temperature.With the charing 5 hours under 1200 ℃, blanket of nitrogen of above-mentioned infrared electric heating plate presoma, obtain heating unit of infrared electric heating plate.It is 1.32w/cm that infra-red emission is measured its maximum spectral radiance of surface
2/ sr/m, corresponding wavelength is 2.41 μ m, heating unit of infrared electric heating plate maximum radiation temperature is 929.3 ℃ of (see figure 5)s.
Embodiment 5 multi-walled carbon nano-tubes (average diameter 60nm) and crystalline flake graphite (granularity is 45 μ m) mixture (weight ratio 1: 2), carborundum (granularity is 15 μ m), phenolic resins, polyvinyl alcohol were by weight 2: 13: 4: 1 mixes, after making 1mm thickness sheet on the twin-roll machine, on vulcanizing press, 150 ℃ solidified 0.5 hour down, obtained the infrared electric heating plate presoma after naturally cooling to room temperature.With the charing 6 hours under 1800 ℃, argon atmospher of above-mentioned infrared electric heating plate presoma, obtain heating unit of infrared electric heating plate.It is 1.51w/cm that infra-red emission is measured its maximum spectral radiance of surface
2/ sr/m, corresponding wavelength is 2.33 μ m, heating unit of infrared electric heating plate maximum radiation temperature is 970.6 ℃.
Embodiment 6 conductive blacks (granularity is 20nm) and crystalline flake graphite (granularity is 45 μ m) mixture (weight ratio 1: 3), silicon dioxide (granularity is 20 μ m), epoxy resin, ethanol were by weight 15: 19: 15: 1 mixes, with said mixture after making 1mm thickness sheet on the twin-roll machine, on vulcanizing press, 65 ℃ solidified 3 hours down, obtained the infrared electric heating plate presoma after naturally cooling to room temperature.With the charing 5 hours under 2200 ℃, blanket of nitrogen of above-mentioned infrared electric heating plate presoma, obtain heating unit of infrared electric heating plate.It is 0.64w/cm that infra-red emission is measured its maximum spectral radiance of surface
2/ sr/m, corresponding wavelength is 2.38 μ m, heating unit of infrared electric heating plate maximum radiation temperature is 944.0 ℃.
Embodiment 7 conductive blacks (granularity is 60nm), carborundum (granularity is 15 μ m), phenolic resins, glycerine were by weight 6: 10: 3: 1 mixes, with said mixture after making 1mm thickness sheet on the twin-roll machine, on vulcanizing press, 150 ℃ solidified 0.5 hour down, obtained the infrared electric heating plate presoma after naturally cooling to room temperature.With charing under 1800 ℃ of above-mentioned infrared electric heating plate presomas, the blanket of nitrogen 12 hours, obtain heating unit of infrared electric heating plate.It is 0.54w/cm that infra-red emission is measured its maximum spectral radiance of surface
2/ sr/m, corresponding wavelength is 2.45 μ m, heating unit of infrared electric heating plate maximum radiation temperature is 909.0 ℃.
Embodiment 9 multi-walled carbon nano-tubes (average diameter is 40nm) and crystalline flake graphite (granularity is 45 μ m) mixture (weight ratio 1: 5), carborundum (granularity is 20 μ m), epoxy resin, ethanol were by weight 15: 19: 15: 1 mixes, with said mixture after making 1mm thickness sheet on the twin-roll machine, on vulcanizing press, 65 ℃ solidified 3 hours down, obtained the infrared electric heating plate presoma after naturally cooling to room temperature.With the charing 5 hours under 1800 ℃, blanket of nitrogen of above-mentioned infrared electric heating plate presoma, obtain heating unit of infrared electric heating plate.It is 0.64w/cm that infra-red emission is measured its maximum spectral radiance of surface
2/ sr/m, corresponding wavelength is 2.38 μ m, heating unit of infrared electric heating plate maximum radiation temperature is 944.0 ℃.
Claims (6)
1, a kind of heating unit of infrared electric heating plate is characterized in that, described heating unit of infrared electric heating plate is made of electric conducting material, heat conducting material, polymer bonding agent and flexibilizer, and by weight percentage, this heater raw material comprises:
Electric conducting material 1%-30%;
Heat conducting material 92%-30%;
Bonding agent 5%-50%;
Flexibilizer 2%-10%;
Described electric conducting material is one or more compound formations of crystalline flake graphite, carbon nano-tube, conductive black;
Described heat conducting material is one or more of carborundum, silicon dioxide, boride;
Described bonding agent is the polymer bonding agent, comprises one or more compound formations of epoxy resin, ABS resin, phenolic resins, Corvic and acrylic resin;
Described flexibilizer is ethanol, glycerine or polyvinyl alcohol.
According to the described heating unit of infrared electric heating plate of claim 1, it is characterized in that 2, by weight percentage, the preferred group of this heater raw material becomes:
Electric conducting material 5%-20%;
Heat conducting material 80%-50%;
Bonding agent 10%-30%;
Flexibilizer 2%-5%.
3, according to the preparation method of the described heating unit of infrared electric heating plate of claim 1, it is characterized in that, comprise the steps:
(1) electric conducting material, heat conducting material, polymer bonding agent and flexibilizer are mixed, be heating and curing then or hot-forming laminating;
(2) take out behind the natural cooling, obtain the infrared electric heating plate presoma; The weight of used infrared electric heating plate presoma consists of:
Electric conducting material 1%-30%;
Heat conducting material 92%-30%;
Bonding agent 5%-50%;
Flexibilizer 2%-10%;
(3) with above-mentioned infrared electric heating plate presoma under nitrogen or inert gas shielding, 900-2200 ℃ high temperature carbonization 3-12 hour, obtain heating unit of infrared electric heating plate.
4, according to the preparation method of the described heating unit of infrared electric heating plate of claim 3, it is characterized in that, in the infrared electric heating plate presoma preparation process, when adopting thermosetting resin, with the method for being heating and curing as bonding agent; Electric conducting material, heat conducting material are joined in the resin, and after mixing with flexibilizer, roll-in is laminated, and is heating and curing then, and curing temperature is 65-150 ℃, and the time is 0.5-5 hour.
5, according to the preparation method of the described heating unit of infrared electric heating plate of claim 3, it is characterized in that, in the infrared electric heating plate presoma preparation process, when adopting thermoplastic resin, use pressure sintering as bonding agent; Electric conducting material, heat conducting material and thermoplastic resin and flexibilizer are mixed, hot-forming laminating, heating-up temperature is 150-300 ℃, and the time is 10-30 minute, and pressure is 5-20MPa.
According to the preparation method of the described heating unit of infrared electric heating plate of claim 3, it is characterized in that 6, the thickness of thin slice is 0.1mm-2mm.
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| CNB2006101351015A CN100518415C (en) | 2006-12-27 | 2006-12-27 | Heating unit of infrared electric heating plate and producing method |
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