KR20110075874A - The manufacturing method of conductive material utilizing the graphite group materials - Google Patents

Abstract

PURPOSE: A method for manufacturing a heating element using graphite-based materials is provided to prevent environmental pollution and to suppress generation of harmful materials by using inorganic materials. CONSTITUTION: Mineral powders include C of 5-72.7 weight %, O of 20-86.7 weight %, Mg of 1-7.7 weight %, Al of 1-67.7 weight %, Si of 3-69.7 weight %, S of 0.5-67.2 weight %, Cl of 0.5-67.2 weight %, Ca of 2-68.7 weight %, Ti of 0.1-66.8 weight %, Mn of 0.05-66.75 weight %, Fe of 0.05-66.75 weight %, and In of 0.1-66.8 weight %. One or more compounds are selected from a group including the mineral powders of 10-90 weight percent, alkali metal chloride, and alkaline earth metal chloride. A hydrophobic polymer is coupled with a surface of a hydrophilic exzyme.

Description

The manufacturing method of the heating element using a graphite-based material {The manufacturing method of conductive material utilizing the graphite group materials}

The present invention relates to a method for producing a heating element using graphite-based materials such as carbon fiber, conductive graphite, conductive filler, carbon nanotubes, more specifically, C 5-72.7%, O 20-86.7%, Mg 1 ~ 67.7%, Al 1 to 67.7%, Si 3 to 69.7%, S 0.5 to 67.2%, Cl 0.5 to 67.2%, Ca 2 to 68.7%, Ti 0.1 to 66.8%, Mn 0.05 to 66.75%, Fe 0.05 to 66.75% And at least one compound selected from the group consisting of 10 to 90% by weight of the mineral powder having an elemental composition ratio of 0.1 to 66.8% and an alkali metal chloride and an alkaline earth metal chloride, on the surface of the hydrophilic enzyme. When a liquid binder is prepared in a solution in which an alkali metal or an alkaline earth metal is eluted by incorporating a hydrophobic polymer into a mixture of an amphiphilic surface-active enzyme and clustered water. Full use of clustered water used 60 to 98% by weight of a binder comprising 10 to 90% by weight of a liquid binder containing water and a pH regulator containing less than 1% by weight of rare earth elements, and carbon fibers, conductive graphite, conductive fillers and carbon nanotubes ( By uniformly mixing and molding at least one type of 2-40% by weight of the graphite-based materials composed of CNTs, and curing them at room temperature, all the materials used are inorganic, so there is no emission of harmful components to the human body. The present invention relates to a method of manufacturing a heating element using a graphite-based material that is excellent in heat generating efficiency without causing contamination, and has excellent adhesive strength and strength, and is easily processable and can be manufactured at low cost.

In general, a heating element is an object that transfers energy by converting electrical energy into thermal energy and radiates the heat to the outside, and is widely used in various home appliances or industrial fields, and is classified into a metal heating element, a non-metal heating element, and other heating elements depending on materials. do.

The metal heating elements that constitute the mainstream of the early heating elements include Fe-Cr-Al, Ni-Cr and high melting point metals (platinum, Mo, W, Ta, etc.), and far-infrared rays on the surface of metal tubes filled with inorganic insulators such as MgO. Surface treatment of the radioactive material. As the non-metallic heating element, silicon carbide, molybdenum silicide, lanthanum chromite, carbon, zirconia, and the like are used. Other heating elements include ceramic materials, barium carbonate, and thick film resistors.

When the heating elements are classified according to their external forms, they may be divided into linear heating elements and planar heating elements, commonly referred to as heating wires. Representative examples of the linear heating element include filament and nichrome wire. In addition, the planar heating element refers to a heating element that generates heat from the entire surface by installing metal electrodes at both ends on a thin planar conductive heating element, and then insulating with an insulating material, using a thin metal plate and using a heat generating paint (carbon black). And carbon fiber.

Recently, due to new awareness of energy saving and environmental issues, many studies on the manufacturing and application of heating elements have been conducted in many countries.

Nichrome wire alloyed with nickel and chromium has been commonly used as a heating resistance part of a conventional heating element. Since the nichrome wire heating element flows through a single wire, if any part of the heating wire is cut off, the nichrome wire becomes thin due to oxidation reaction as time passes while electricity is not used. There is a problem.

Among other heating element types, there is a ceramic heating element, which uses a ceramic slurry to make a soft green sheet, cuts the green sheet to an appropriate size, prints a resistance on the surface using a metal paste, and prints the resistance. The green sheet and the green sheet which is not printed with resistance are laminated and hot pressed, and then manufactured by firing at a temperature of 1400 ° C. to 1700 ° C.

By the way, in the conventional heating element using the ceramic slurry, since a separate dedicated equipment for pressing the green sheet is required, a considerable equipment investment cost is required, and the firing temperature must be high and at least 24 hours are required for the manufacturing process. There is a problem with this lengthening.

In addition, it is difficult to precisely control the size by shrinking about 15% of the volume during the firing process, and a large amount of crystallization agent contained in the green sheet during the firing process exists as residual carbon due to incomplete combustion, so that the electrical resistance and withstand voltage characteristics of the heating element are increased. There is a fatal adverse effect on the problem.

The metal heating element is less deformed at high temperatures, has good workability, has good oxidation resistance, but generates heat at high pressures, and thus the magnetic field generated when current flows is harmful.

Among the non-metal heating elements, silicon carbide heating elements are the most non-metal heating elements, and are widely used industrially for a wide range of fields. They are mainly used in the temperature range of 800 to 1600 ° C, and molybdenum silicide (MoSi ₂ ) -based and lanthanum chromate (LaCrO) are used. ₂ ) Heating elements are used at special high temperatures.

Graphite (carbon) heating elements are used as resistance heating elements that generate electricity directly by heating, and as various high temperature heating elements that use heat generated by high frequency induction. Graphite (carbon) heating elements are most often used at a temperature of 200 ~ 2500 ℃ when used in neutral or reducing atmospheres. In the case of resistance heating elements, the shape of pipes, rods, and plates is simple according to the use conditions or electrical conditions. To complex ones. As a characteristic of graphite (carbon) heating element, heat and electricity are well transmitted, small thermal expansion, excellent heat and impact resistance, high strength at high temperature, chemical stability, chemical resistance as well as processability. However, graphite (carbon) products have a disadvantage in that they start to be scattered at a certain temperature (350 ° C in the air, 450 ° C in the graphite) or more, and mechanical strength is lower than that of metal.

Graphite generates heat even at low pressure below 30 volts, and even if the temperature of the heating element changes, there is no change in the resistance value. Therefore, it is possible to maintain a predetermined temperature by adjusting the voltage. Similar to the earth's magnetic field, is not only harmless to the human body or animals, but also has the function of promoting the growth of animals and plants.

Graphite is a very difficult material to solidify the powder despite its advantages. In the case of using the conventional technology, the graphite powder cannot be solidified by a conventional method, so it must be solidified at high pressure or high temperature. However, the solidification of the graphite powder requires expensive equipment, which is expensive and expensive. Expensive graphite solids are used only in reactor control rods and special purpose high temperature heating furnaces.

In addition, the graphite can be solidified by drawing fine fibers, but does not generate heat at low pressure.

Although graphite heating element has many excellent advantages when used as heating element for human body or animals and plants, it is inexpensive, small in size and low in size due to the need of special equipment and technology of high pressure or high temperature in solidification molding process. In order to process using a machine tool, secondary processing costs are required.

Even after the graphite powder is formed, the fine powder is deposited on the surface and the graphite itself is an electrical conductor, so electricity flows from the surface, which may cause a short circuit through the surface of the heating element or an electric shock of a person or a plant or animal. In a vacuum or nitrogen atmosphere, or at low temperature heat generation, graphite is sealed with a synthetic resin or a metal material. In the case of a high temperature heating element, a special method is inevitable in order to prevent oxidation of graphite, but in the case of low temperature heating, it is expensive to coat with synthetic resin, and there is a risk that harmful substances are emitted during the heating of the heating element. Even though it is expensive, electricity or electricity through the heating element may be shorted through the metal or the metal sheath may come into contact with the animal or the animal.

Therefore, the object of the present invention is that all the materials used are inorganic, so there is no emission of harmful components to the human body, and it does not cause environmental pollution, and has excellent heat generation efficiency, excellent adhesive strength and strength, and easy processing. The present invention provides a method for manufacturing a heating element using a graphite-based material which can easily manufacture the used heating element at low cost.

In order to easily achieve the above objects as well as other objects that are easily expressed, in the present invention, C 5-72.7%, O 20-86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, Mineral powder having elements composition ratios of S 0.5 to 67.2%, Cl 0.5 to 67.2%, Ca 2 to 68.7%, Ti 0.1 to 66.8%, Mn 0.05 to 66.75%, Fe 0.05 to 66.75%, and In 0.1 to 66.8% Amphiphilic by combining at least one compound selected from the group consisting of 90% by weight and alkali metal chlorides and alkaline earth metal chlorides with a hydrophobic polymer on the surface of a hydrophilic enzyme. It is added to the mixture of the surface-active enzyme and the clustered water, and less than 1% by weight of the total amount of the clustered water used to prepare the liquid binder in the solution of the alkali or alkaline earth metal. Contains rare earth elements Is at least 60-98% by weight of a binder composed of 10-90% by weight of a liquid binder mixed with water and a pH adjuster, and at least one graphite-based material consisting of carbon fibers, conductive graphite, conductive fillers, and carbon nanotubes (CNT). 1 to 2 to 40% by weight of uniformly mixed and molded, and then cured at room temperature, all the materials used are inorganic, so there is no emission of harmful components to the human body, and it does not cause environmental pollution, and is excellent in heat generating efficiency, adhesive strength and The heating element using the graphite-based material having excellent strength and easy processability could be easily manufactured at low cost.

The method of manufacturing a heating element using the graphite-based material according to the present invention is not only the emission of harmful components to the human body because the materials used are all inorganic, it does not cause environmental pollution, excellent heat generation efficiency, excellent adhesion strength and strength, processability There is an effect that the heating element using this easy graphite-based material can be easily manufactured at low cost.

Method for producing a heating element using the graphite-based material according to the present invention is C 5-72.7%, O 20-86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, 10 to 90% by weight of mineral powder and alkali metal having an element composition ratio of 0.5 to 67.2% of Cl, Ca 2 to 68.7%, Ti 0.1 to 66.8%, Mn 0.05 to 66.75%, Fe 0.05 to 66.75%, and In 0.1 to 66.8% Amphiphilic surfactants by combining at least one compound selected from the group consisting of chlorides and alkaline earth metal chlorides with a hydrophobic polymer on the surface of a hydrophilic enzyme. A rare earth element containing less than 1% by weight of the total amount of clustered water used in the preparation of a liquid binder in a solution eluting alkali metal or alkaline earth metal in a mixture of surface-active enzyme and clustered water. Combined liquid with water and pH regulator 60 to 98% by weight of the binder composed of 10 to 90% by weight and at least one of 2 to 40% by weight of the graphite-based material consisting of carbon fibers, conductive graphite, conductive fillers, carbon nanotubes (CNT) uniformly mixed It is characterized by hardening at normal temperature after shaping | molding.

Mineral powder in the binder composition is C 5-81.7%, O 20-86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2 to 68.7%, 0.1 to 66.8% of Ti, 0.05 to 66.75% of Mn, 0.05 to 66.75% of Fe, and 0.1 to 66.8% of elements having an element composition ratio are used.

It is preferable to use a mineral powder that does not contain heavy metals that harms the human body, and may contain trace elements in addition to the above components, and some of the above components do not contain or are substituted with other components. Also available. In addition, the elemental composition ratio of the mineral powder is not particularly limited, but C, O, Mg, Al, Si, S, Cl, and Ca must be included, and although the function of each element is not clearly identified, the above elements When each of these is not contained, the effect by this invention cannot be acquired.

The mineral powder is effective to use those having a particle size of 200 ~ 325 mesh (mesh), when the particle size is less than 200 mesh, there is a problem that the strength of the heating element to be produced is not satisfactory, if the excess exceeds 325 mesh The cost is rising and not economical.

Meanwhile, alkali metal chlorides and alkaline earth metal chlorides refer to chlorides of Li, Na, K, Rb, Cs, Si, Al, Fe, Ca, Na, K, and Mg, and at least one of them should be used. Chloride and alkaline earth metal chlorides form a colloidal solution of mineral particles by surface-active enzyme and clustered water, and the colloidal solution formed functions as a binder by binding to minerals of mineral powder.

In addition, surface-active enzyme binds to hydrophilic enzyme surface to show amphiphilic by combining hydrophobic polymer with alkali metal chloride and alkaline earth metal. It is effective to support the activation of the chloride, it is effective to use the amount of 0.1 to 3% by weight based on the weight of the clustered water, when the amount of the surfactant is less than 0.1% by weight relative to the weight of the clustered water There is a disadvantage that the activation of the alkali metal chloride and alkaline earth metal chloride is weak, there is a problem that is not economical when it exceeds 3% by weight.

In addition, the clustered water may be prepared using the methods described in US Pat. Nos. 5,711,950 and 6,033,678, and there is a problem in that the colloidal solution prepared is not stabilized when non-clustered water is used.

At least one compound selected from the group consisting of alkali metal chlorides and alkaline earth metal chlorides is added to and dissolved in a mixture of clustered water and surfactant. At this time, the amount of the at least one compound selected from the group consisting of alkali metal chlorides and alkaline earth metal chlorides is effective to use the amount of 1 to 60% by weight based on the weight of the clustered water, alkali metal chloride and alkaline earth metal When at least one or more compounds selected from the group consisting of chlorides are used in less than 1% by weight, there is a disadvantage in that the binding strength with mineral components derived from the mineral powder is lowered. Weak

A liquid binder is prepared in which water containing a small amount of rare earth elements and a pH adjusting agent are mixed in a solution in which an alkali metal and / or alkaline earth metal chloride is dissolved in a mixture of surfactant and clustered water.

Rare earth elements include lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, turlium, yttbium, ruthenium, scandium, yttrium, etc. Also available. Water containing a small amount of rare earth elements functions as an adjuvant of alkali metals and / or alkaline earth metal chlorides, and at the same time, functions to easily combine minerals and colloidal solutions by sterilization and bacteriostatic action. The content of the rare earth element is effective to use less than 1% by weight based on the total weight of the clustered water, and even in the water containing the rare earth element, water is used as the clustered water.

On the other hand, by using a pH adjuster in the liquid binder to be prepared to make the pH of the product produced is slightly alkaline, the amount of the pH adjuster can be appropriately adjusted according to the required pH.

The liquid binder and the mineral powder prepared as described above are mixed in amounts of 10 to 90% by weight, respectively, to prepare a binder. If the liquid binder is less than 10% by weight or the mineral powder is more than 90% by weight, the strength of the heating element produced is low, the curing time takes a long time, the liquid binder is more than 90% by weight or mineral powder If the amount is less than 10% by weight, the strength of the heating element is improved, but there is a problem in that molding and curing of the heating element are not easy.

When the liquid binder and the mineral powder are mixed, the condensation and curing occur rapidly, so it is preferable to mix immediately before molding into a heating element.

It is effective to use 60-98 weight% with respect to the weight of a heat generating body, and the binder comprised as mentioned above can be suitably adjusted according to the graphite-type material used and the target calorific value. When the amount of the binder used is less than 60% by weight, the strength of the heating element to be manufactured is weak, and workability is not easy, and when the amount of the binder exceeds 98% by weight, the heat generation efficiency is deteriorated.

In addition, the present invention uses 2 to 40% by weight of at least one or more materials selected from the group consisting of carbon fibers, conductive graphite, conductive fillers, and carbon nanotubes (CNT) as the graphite material.

The carbon fiber is a fiber made by heating and carbonizing an organic fiber in an inert gas, and as a raw material, cellulose, acrylic fiber, vinylon, pitch, etc. are used, and the molecular arrangement and crystal change depending on the raw material or the processing temperature. Occurs. In general, hexagonal rings of carbon form a layered lattice successively, have a metallic luster, black or gray, and have a strength of 10 to 20 g / d and a specific gravity of 1.5 to 2.1. Excellent heat resistance and impact resistance, resistant to chemicals and high resistance to pests. Molecular weights such as oxygen, hydrogen, nitrogen, etc. are lost during the heating process, and thus the weight is reduced. Due to these characteristics, sporting goods (fishing rods, golf clubs, tennis rackets), aerospace industry (heat-resistant materials, aircraft fuselage), automobiles, civil construction (light materials, interior materials), electrical and electronics, telecommunications (antenna), environmental industry (air purifier) It is widely used as a high performance industrial material in each field.

In addition, although the conductive graphite utilizes the excellent electrical conductivity of the graphite, it has a disadvantage in that the electrical conductivity is not satisfactory compared to other materials, and thus must be used in a large amount.

In addition, a conductive filler commonly used in the art may be used.

Carbon nanotubes are hexagonal materials consisting of six carbons connected to each other to form a tubular shape, and the diameter of the tube is only tens to tens of nanometers, which is called carbon nanotubes, and its electrical conductivity is similar to that of copper. Is the best diamond in nature, with 100 times the strength of steel, carbon fiber breaks with only 1% strain, while carbon nanotubes can withstand 15% strain, and semiconductors, flat panel displays, batteries, and superpowers. Numerous devices using carbon nanotubes, such as fibers, biosensors and television CRTs, have been developed.

In the present invention, it is effective to use 2 to 40% by weight of the graphite-based material with respect to the weight of the heating element, and when the amount of the graphite-based material is less than 2% by weight, the heating efficiency of the manufactured heating element is not satisfactory. If it exceeds 40% by weight, the strength is lowered, and there is a problem that molding is not easy.

In the present invention, it is most preferable to use carbon nanotubes in the graphite-based material in terms of heat generation efficiency.

The heating element according to the present invention may be manufactured in various forms such as plate and rod.

The heating element according to the present invention is not only exhibits high strength and excellent heat generating efficiency by strongly binding the graphite-based material by the mechanism as shown in FIG. 1, but also enables the production of only the inorganic material without the use of cement or synthetic resin.

That is, a strong binding force is exerted by the reaction of dissolusion → formation of aquasols → condensation → gel formation → crystallization.

Heating element according to the present invention can block the harmfulness of the existing cement or synthetic resin, and can improve the strength high, do not cause environmental pollution and do not emit harmful components to the human body, as well as environmentally friendly and durable, excellent strength In addition, the effect of high heat generation efficiency and excellent workability.

1 is a schematic diagram illustrating a mechanism of action in the manufacture of a heating element according to the present invention,

2 is a photograph of a heating element according to the present invention.

Claims (2)

C 5-72.7%, O 20-86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2 68.7%, Ti 0.1 At least one selected from the group consisting of 10 to 90% by weight of mineral powder having an elemental composition ratio of 6 to 66.8%, Mn 0.05 to 66.75%, Fe 0.05 to 66.75%, and In 0.1 to 66.8%, and alkali metal chlorides and alkaline earth metal chlorides The above compound is combined with a hydrophobic polymer on the surface of a hydrophilic enzyme and added to a mixture of amphibiphilic surface-active enzyme and clustered water. 10 to 90% by weight of a liquid binder in which a pH eluting agent is mixed with water containing less than 1% by weight of rare earth elements based on the total amount of clustered water used in the preparation of the liquid binder in a solution in which an alkali metal or alkaline earth metal is eluted. 60 to 98% by weight of a binder composed of graphite 2 to 40 were uniformly mixed and molded by weight%, The method of heating using a graphite-based material, characterized in that the curing at room temperature. The method of claim 1, wherein the graphite material is at least one selected from the group consisting of carbon fibers, conductive graphite, conductive fillers, and carbon nanotubes.

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