Method for manufacturing microwave cooker equipped with waterproof and high-performance ceramic heating element

Abstract

The invention relates to a cooker formed by combining a metal heating plate, a waterproof film and a ceramic waterproof and hydrophobic blanket heat insulation material in a main body container. By means of the waterproof structure of the main body container and the pressure regulating valve used for discharging internal expansion pressure, the ceramic waterproof and hydrophobic blanket thermal insulation material and the waterproof layer are endowed with waterproof and hydrophobic functions so as to prevent water from flowing into the heating layer, so that the combination proportion of the heating layer composition can be conveniently regulated; and therefore, the required heating temperature is realized. The manufacturing method of the microwave cooker with the waterproof function and the high-performance ceramic heating body is provided.

Description

Technical Field

[0001] This invention relates to a method for manufacturing a microwave oven cooker that uses the heat generated when microwaves are converted into thermal energy when microwaves are irradiated onto a ceramic heating element composition, i.e., a heating layer, to cook food. Background Technology

[0002] As prior art, this includes Korean Patent No. 10-0937534, "Heating Cooker for Microwave Oven Equipped with Safety Device," and Korean Patent No. 10-1885955, "Ceramic Heating Cooker Utilizing Microwaves."

[0003] Although the technology can release the internal thermal expansion pressure through the vent at the bottom of the main container 4, water will flow into the interior when the container is washed after cooking. Since the ceramic blanket insulation material is hydrophilic, it will immediately absorb water and lose its function as an insulation material when it comes into contact with water. Furthermore, the heating layer uses hydrophilic adhesive materials, such as sodium silicate or fly ash, which will cause its structure to collapse when it comes into contact with water, thus resulting in the loss of its heating capacity.

[0004] Furthermore, the rated high-frequency output power of microwave ovens launched in recent years is not constant. Instead, various high-frequency output power products (rated high-frequency output power ranging from 200W to 2400W, etc.) have been introduced to complete cooking faster and more conveniently. For example, commercial microwave ovens have introduced high-output power models to shorten cooking time, while household microwave ovens have introduced models with relatively lower output power. In addition, even for products with the same high-frequency output power, the heating temperature can vary between different manufacturers.

[0005] Low-power microwave ovens require longer cooking times, while high-power microwave ovens risk burning food. Therefore, microwave ovens need a custom heating layer that can adapt to different output powers. However, existing microwave oven heating layers are made by mixing a binder with rolled iron scale, steelmaking slag, or magnetite (Fe3O4) particles. As mentioned above, this simple and uniform heating layer manufacturing method results in all heating layers having the same heating capacity, making it impossible to manufacture temperature-customized heating layers.

[0006] Furthermore, everyday food cooking utensils are used for cooking food and must be washed afterward, thus frequently coming into contact with water. Although existing technologies include precautions warning users against using dishwashers or immersing them in water, if water seeps in through the bottom vents due to negligence, the hydrophilic ceramic blanket insulation material and heating layer will become wet, resulting in the inability to achieve the desired heating effect even when exposed to microwaves.

[0007] In particular, when the air that expands due to heat during cooking is expelled through the vent, a low-pressure environment is created inside the main container. As a result, when the product is soaked in water for washing, water is quickly absorbed into the interior due to the pressure difference.

[0008] Prior technology documents

[0009] Patent documents

[0010] (Patent Document 1) Korean Patent Registration No. 10-0937534

[0011] (Patent Document 2) Korean Patent No. 10-1885955 Summary of the Invention

[0012] The present invention aims to solve the problems existing in the prior art as described above. Its purpose is to provide a method for manufacturing a microwave oven cooker that can prevent the heating layer from being wetted by water by equipping the main container with a waterproof structure and adding waterproof and hydrophobic functions to the heat insulation material and ceramic heating layer assembled inside. Furthermore, it can conveniently combine and manufacture a temperature-customized heating plate that can adapt to different microwave oven output power heating temperatures by separating the base adhesive manufacturing process and the heating layer manufacturing process. This improves the heating performance of microwave oven cookers in microwave ovens.

[0013] To achieve the objectives described above, the present invention is implemented through the following technical solutions.

[0014] * Equipped with a waterproof structure including valve groove 41, waterproof membrane 6, pressure regulating valve 5, and silicone seal 22;

[0015] After removing the vent structure formed at the bottom of the main container,

[0016] The main container 4 is equipped with a valve groove 41, a waterproof membrane 6, and a pressure regulating valve 5.

[0017] Equipped with a primary waterproofing system that prevents water from seeping into the interior by causing the silicone seal 22 of the heating plate 2 to fit tightly into the silicone seal groove 43 of the main container.

[0018] *Waterproof and hydrophobic structures used to protect the heating layer;

[0019] In this invention, since the heating layer 21 is the component that ultimately needs to be protected from contact with water, a two-stage waterproofing system is provided to protect the heating layer. This system uses ceramic waterproofing and hydrophobic blanket insulation material 3 to give the heating layer hydrophobic properties.

[0020] Therefore, even if some water flows into the main container, the water can be turned into steam and discharged through the pressure regulating valve 5, thereby preventing the problem of decreased heating performance.

[0021] *The base adhesive used to manufacture the required high-performance customized heating layer and the heating layer manufacturing steps;

[0022] In existing technologies, the manufacturing process of the heating layer is integrated, thus all heating layers exhibit the same heating capacity.

[0023] In order to adapt to microwave ovens with various high-frequency output power, the present invention separates the manufacturing steps of the base adhesive and the heating layer 21 composition through a convenient manufacturing process that allows for adjustment of the composition ratio, thereby proposing a method for manufacturing that allows for customized combination of the composition ratio of Fe3O4 powder, fly ash and rolled iron scale related to heating.

[0024] The present invention can solve the problem of heat generation caused by moisture by applying the first-level and second-level waterproof system structure.

[0025] Furthermore, the present invention can manufacture customized heating cookware suitable for microwave ovens with various output powers by producing a heating layer composed of a high-heating composition, a medium-heating composition, and a low-heating composition, thereby improving cooking satisfaction.

[0026] Furthermore, although the heating layer composition, i.e., rolled iron scale, has almost no stickiness when mixed with the binder, the fine particle size of Fe3O4 powder and fly ash can enhance its viscosity when mixed with the binder, thereby improving the mixability, adhesion and flowability of the mixture, and thus making the molding and adhesion process of the heating layer simpler.

[0027] Furthermore, the cooking utensils manufactured using this invention can increase the heating temperature by approximately 20-30% or more compared to heating layers based on existing technologies, thereby achieving the effect of shortening cooking time and improving cooking satisfaction.

[0028] Furthermore, heating methods that use natural gas as a heat source can cause air pollution problems such as global warming and indoor pollution from incompletely combusted gases due to the carbon dioxide produced by fossil fuels. However, the heat source of this invention is the heating of a ceramic heating layer heated by microwaves, rather than natural gas, thus providing an environmentally friendly cooking appliance.

[0029] Furthermore, the cookware manufactured by this invention uses the energy of converting microwaves into high-heat far-infrared rays to cook food, thus achieving the effect of enhancing the inherent flavor and aroma of the food. Attached Figure Description

[0030] Figure 1 This is a sequence diagram illustrating the manufacturing steps of the present invention.

[0031] Figure 2 This is an exploded perspective view of the cookware manufactured using this invention.

[0032] Figure 3 This is a cross-sectional view of the cookware manufactured using this invention.

[0033] Figure 4 This is a schematic diagram illustrating the heating layer of the heating plate according to the present invention.

[0034] Figure 5 This is a schematic diagram illustrating the pressure regulating valve according to the present invention.

[0035] Figure 6 This is an enlarged view of the valve groove inside the main container according to the present invention.

[0036] Figure 7 This is an enlarged view of the valve groove portion outside the main container according to the present invention.

[0037] Figure 8 The results are from hydrophobicity tests of the heating layer in the prior art and the heating layer of the present invention.

[0038] Figure 9 The results are from a comparative test of the waterproof and hydrophobic properties of existing ceramic blanket insulation materials and the ceramic blanket insulation material of this invention.

[0039] Explanation of reference numerals in the attached figures

[0040] 1: Lid

[0041] 2: Heating plate

[0042] 21: Heating layer

[0043] 22: Silicon seals

[0044] 23: Protruding end of the plate

[0045] 3: Ceramic waterproofing and hydrophobic insulation blanket materials

[0046] 4: Main Container

[0047] 41: Valve groove section

[0048] 42: Supporting leg

[0049] 43: Silicon seal groove

[0050] 44: Perforated section

[0051] 45: Protruding end of the main container

[0052] 46: Exhaust ribs (1), (2)

[0053] 47: Exhaust port

[0054] 48: Shelved ends (1), (2), (3)

[0055] 49: Cover Protector

[0056] 5: Pressure regulating valve

[0057] 51: Support platform

[0058] 52: Cover

[0059] 53: Supporting section

[0060] 54: Bending section

[0061] 55: Curved opening

[0062] 56: Recessed groove

[0063] 57: Exhaust passage

[0064] 6: Waterproof membrane (1), (2)

[0065] 7: Sealed space

[0066] 71: Airflow. Detailed Implementation

[0067] Next, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In describing the embodiments of the present invention, details will be omitted regarding matters not directly related to the technical features of the present invention, matters well-known to those skilled in the art, and parts that can be repeatedly applied in various embodiments.

[0068] Furthermore, the terms used thereafter are defined in consideration of their function in this invention and may change depending on the intentions or conventions of the user or user. Therefore, they should be defined based on the entire contents of this specification that describes this invention.

[0069] Furthermore, the photographs of the proposed diagrams only present a preferred embodiment of the present invention. Simple numerical or structural changes or modifications using equivalent elements made by others should be understood as being included within the technical scope of the present invention.

[0070] The manufacturing steps according to the present invention are as follows: Figure 1 As shown, the manufacturing steps will now be described in more detail.

[0071] [Main container manufacturing steps equipped with valve groove structure]

[0072] The main container 4 is preferably made of a material with high heat resistance that allows microwaves to pass through, such as thermoplastic resin, silicone rubber, or ceramic.

[0073] The valve groove 41 is located at a certain point on the bottom of the main body container 4. It consists of a perforated part 44 for the pressure regulating valve 5 to be connected, a plurality of exhaust ribs 46 arranged in a manner that allows air to flow through the space between the ribs on a part inside the main body container, and an exhaust port 47. It is equipped with a cover 49 on the outside to maintain the normal assembly state of the pressure regulating valve 5.

[0074] Even if the exhaust rib 46 comes into contact with foreign objects such as insulation material debris, the airflow in the space between the ribs will not be blocked, and the expansion pressure can be smoothly transmitted to the recess 56 of the pressure regulating valve 5.

[0075] [Waterproof Membrane Manufacturing Steps]

[0076] The waterproof membrane 6 is located between the bottom of the main container 4, including the valve groove 41, and the ceramic waterproof and hydrophobic blanket heat insulation material 3. It uses a material such as mica sheet that has waterproof properties, high heat resistance, insulation, and allows microwaves to pass through.

[0077] Even if water flows in through the joint of the pressure regulating valve 5, it can prevent water from flowing into the bottom of the ceramic waterproof and hydrophobic blanket insulation material.

[0078] The preferred waterproof membrane 6(1) is shaped to cover a certain part of the valve groove 41 and the bottom of the main container, but does not cover the exhaust port 47, leaving it open. Therefore, the expansion airflow 71 of the sealed space 7 can flow to the pressure regulating valve 5 through the exhaust port 47 of the valve groove 41.

[0079] Another preferred waterproof membrane 6(2) is a structure in which the waterproof membrane 6 is placed above the resting end 48 of the main container and only covers the valve groove 41, but does not cover the exhaust port 47, leaving it open.

[0080] The present invention can select an appropriate one of the waterproof membranes 6 according to the characteristics of the finished product.

[0081] [Pressure regulating valve manufacturing steps]

[0082] The pressure regulating valve 5 of the present invention is a structure that can discharge the thermal expansion pressure formed in a closed space to the outside when the heating layer 21 is heated to high temperature by irradiation with microwaves.

[0083] In particular, when moisture flows into the interior, it will turn into steam and cause an increase in pressure. If the internal pressure exceeds a certain benchmark value, it may cause the main container to explode. Therefore, accidents can be prevented by releasing excessive pressure.

[0084] The preferred pressure regulating valve 5 of the present invention is made of silicone rubber and has an upper support platform 51, a middle support column 53 and a lower cover 52. One or more exhaust channels 57 are formed on the support platform and the support column.

[0085] This is a structure in which thermal expansion pressure is transmitted through the exhaust channel 57 to the recessed groove 56 of the cover 52. When the internal pressure exceeds a certain reference value, the elasticity of the silicone rubber automatically causes the bending part 54 to bend downward and form a bending opening 55, thereby venting the pressure to the outside through the gap.

[0086] The silicon pressure regulating valve 5 has the advantages of occupying less space and being easily replaced and reassembled without disassembling the assembled main container.

[0087] Another preferred pressure regulating valve 5 of the present invention is a valve structure that opens and closes by means of spring elasticity. It is a structure in which a component that automatically opens and closes by means of the strength of internal pressure is inserted into the valve through port and moves up and down, including a connecting component with the main container to automatically discharge pressure.

[0088] [Basic Adhesive Manufacturing Steps]

[0089] The base binder is a precursor step used to manufacture the heating layer composition, and is separate from the heating layer composition manufacturing step.

[0090] Although the main components contained in the base adhesive, namely sodium silicate, Fe3O4 powder, and fly ash, are hydrophilic, they can maintain their hydrophobic properties even at high temperatures of 400–500°C after drying and hardening by combining with the inorganic hydrophobic agent added in this invention.

[0091] The preferred base adhesive composition of the present invention is prepared by stirring a mixture comprising, based on 100 parts by weight, 30 to 50 parts by weight of sodium silicate, 1.5 to 2 parts by weight of 99% acetic acid, 20 to 220 parts by weight of Fe3O4 powder, 10 to 70 parts by weight of fly ash, and 5 to 10 parts by weight of an inorganic hydrophobic agent.

[0092] The sodium silicate can be selectively used according to the SiO2 and Na2O content required by Class 1, Class 2, Class 3 and Class 4 of Korean Industrial Standard (KSM 1415). In the embodiments of the present invention, the sodium silicate used is Class 2, with SiO2 of 34 to 36 parts by weight and Na2O of 14 to 15 parts by weight.

[0093] The sodium silicate may also contain calcium oxide (K2O) or lithium oxide (Li2O) to further enhance its water resistance.

[0094] Adding acetic acid to the sodium silicate is to reduce the dissolution of the heating layer structure by water by generating crystalline silicate through stirring. Alternatively, a certain amount of concentrated hydrochloric acid (Conc-HCl) or other acid solution can be used instead of acetic acid. Since the type, amount, concentration and temperature of the acid will affect the silicate formed, the appropriate type and proportion of addition can be selected according to the type of composition required.

[0095] Furthermore, the preferred Fe3O4 powder of the present invention has a particle size ranging from less than 200 mesh to nanoparticles and a purity of more than 98%.

[0096] The Fe3O4 powder, as a strongly magnetic ceramic, can increase the heating temperature by enhancing the microwave absorption capacity of the heating layer and strengthen the impact strength by enhancing the adhesive bonding force when mixed with rolled iron scale and fly ash and dried and hardened.

[0097] Furthermore, the fly ash of the present invention is a fine powder produced during coal combustion. Because its particles are spherical, it can act as a ball bearing to reduce frictional resistance during molding. Moreover, the durability and strength of the heating element can be improved by means of volcanic ash reaction, and productivity can be improved by improving formability.

[0098] Furthermore, as the fly ash content increases, the viscosity also increases, thereby improving the formability, but the heating temperature gradually decreases. Therefore, it is necessary to apply a better mixing ratio.

[0099] On the other hand, silica sand can be mixed in to replace the fly ash mentioned above.

[0100] Furthermore, a preferred composition of the inorganic hydrophobic agent of the present invention is prepared by adding 5 to 7 parts by weight of hydrophobic nano silica powder or aerogel powder to a mixed solution of 100 parts by weight of 10 to 90 parts by weight of N-octyltriethoxysilane and 10 to 90 parts by weight of tetraethoxysilane and stirring.

[0101] Furthermore, the mixing method for the basic adhesive of the present invention is as follows.

[0102] Add the measured amount of water to the mixer.

[0103] Add a measured amount of sodium silicate to the water and stir for 30 minutes to 1 hour.

[0104] - Add a measured amount of acetic acid to the solution in small amounts while stirring for 30 minutes to 1 hour to generate and dissolve the silicate.

[0105] - After adding a measured amount of Fe3O4 powder and fly ash to the solution, stirring was performed for 1 hour.

[0106] - Stir for 1 hour after adding a measured amount of inorganic hydrophobic agent to the solution.

[0107] All of the processes were stirred at approximately 200 rpm to ensure that the dissolution occurred uniformly.

[0108] [Manufacturing steps of the heating layer composition]

[0109] The manufacturing step of the heating layer composition of the present invention is to add a certain amount of rolled iron scale to the base binder and mix it. The rolled iron scale is a strong magnetic ceramic that absorbs microwaves and converts them into heat energy to generate high heat in a short time when microwaves are projected. It is generated during the heat treatment of metal and is an oxide film layer containing Fe2O3, SiO2, Al2O3 and FeO.

[0110] The preferred heating layer composition of the present invention,

[0111] Based on the total weight parts of the base adhesive,

[0112] It is made by mixing 350 to 700 parts by weight of rolled iron scale.

[0113] The heating element used in this invention, namely rolled iron scale, is a material that has been crushed and screened after removing foreign matter from the film layer and can pass through a 3mm sieve. Moreover, it is a material with high microwave absorption rate, with a Fe2O3 and FeO content of 80-95%.

[0114] When the heating element composition is pasted as the heating layer of the heating element and then dried and hardened, its structure will form a porous body.

[0115] The porous structure can withstand thermal expansion and contraction well, thereby maintaining adhesion to the heating plate even under high heat and improving the durability and heat resistance of the heating layer.

[0116] Therefore, the present invention can achieve the desired heating temperature of the heating layer by incorporating rolled iron scale in different proportions into the base adhesive composition.

[0117] [Heating Plate Manufacturing Process]

[0118] The heating plate of the present invention is metallic and is constructed by forming and pasting a heating layer composition of the required shape, thickness and quantitative weight on the lower part of the heating plate, and then completely drying and hardening it at 250 to 350°C for 25 to 30 minutes.

[0119] In addition, the thickness, weight, and surface shape of the heating layer attached to the heating plate can affect the heating temperature.

[0120] Therefore, the heating temperature can be adjusted by constructing its surface into various shapes such as planar, concave, and convex.

[0121] That is, a raised heating layer attached to a metallic plate can improve microwave absorption capacity by 10-20% compared to a flat or recessed shape, thereby exhibiting a higher temperature.

[0122] Furthermore, by combining the silicone seal 22 with the edge of the heating plate 2, the silicone seal groove 43 of the main container and the silicone seal 22 can be pressed tightly together by the seal with elastic silicone rubber, thereby ensuring the waterproof function of the main container.

[0123] [Preparation, drying, and curing steps of the hydrophobic reinforcing coating agent for the heating layer]

[0124] In this invention, in order to achieve the hydrophobic function of the heating layer,

[0125] The manufacturing process of the heating layer, which exhibits basic hydrophobic properties through the inorganic adhesive contained in the base adhesive, is carried out.

[0126] Preferably, the process involves applying a hydrophobic reinforcing coating agent over the heating layer, followed by surface treatment such as spraying, drying, and hardening to enhance the hydrophobicity. Therefore, the basic process and the hydrophobic reinforcement process can be applied as needed in manufacturing.

[0127] The inorganic hydrophobic agent is dried and cured after it has been allowed to penetrate into the capillary pores of the heating layer of the porous structure with a small molecular size, thereby improving the hydrophobicity of the heating layer.

[0128] The additives in the hydrophobic reinforcing coating of the heating layer are required to have heat resistance at high temperatures of 400-500°C, and therefore must not contain organic compounds.

[0129] The composition of the hydrophobic reinforcing coating agent of the present invention is based on a mixed solution of 100 parts by weight of 10-90 wt% N-octyltriethoxysilane and 10-90 wt% tetraethoxysilane, with the addition of 5-7 parts by weight of hydrophobic nano silica powder or aerogel powder and 3-10 parts by weight of nano carbon powder, and is then stirred.

[0130] After the hydrophobic reinforcing coating agent is sprayed onto the surface of the heating layer, it can be dried and hardened in a tunnel drying oven at 250-350°C for 25-30 minutes to impart excellent permeability and hydrophobic properties, thereby exhibiting a hydrophobic phenomenon in which water in contact with the surface of the heating layer falls off in beads.

[0131] As a key component added to the hydrophobic coating agent of the present invention, nano-carbon powder plays a role in enhancing adhesion to the heating layer and improving durability and heat resistance by increasing surface hardness.

[0132] [Manufacturing steps for ceramic waterproofing and hydrophobic insulation blankets]

[0133] The preferred waterproof and hydrophobic blanket insulation material of the present invention can prevent the high heat of the heating layer 21 from being transferred to the lower part or side by wrapping the lower part of the heating plate 2. Moreover, the blanket structure is a porous inorganic series ceramic fiber structure, and it is elastic because it is manufactured by spinning a compressed blanket structure that does not contain any organic adhesives.

[0134] The preferred ceramic waterproof and hydrophobic blanket insulation material of the present invention is composed of a porous ceramic fiber blanket structure containing two or more components selected from Al2O3, SiO2, CaO, MgO, ZrO2, silicate groups and alkoxysilyl groups. Moreover, by surface treating the fiber structure with hydrophobic silica material or including the blanket structure in the fiber structure components, high thermal insulation and hydrophobicity can be maintained.

[0135] As another preferred thermal insulation material of the present invention, a hydrophobic blanket composed of a hydrophobic aerogel blanket can be used.

[0136] The ceramic waterproof and hydrophobic blanket insulation materials need to maintain high-temperature heat resistance above 500℃, and should be materials that are insulating yet allow microwaves to pass through.

[0137] [Assembly Steps]

[0138] The assembly steps of the finished product of the present invention,

[0139] After the pressure regulating valve 5 is attached to the valve groove 41 of the main container 4, a waterproof membrane 6 is covered and ceramic waterproof and hydrophobic insulation material 3 and heating plate 2 with heating layer 21 and silicone seal 22 are placed on top of it in sequence. Then, the silicone seal 22 is pressed down to fit tightly into the silicone seal groove 43 of the main container.

[0140] The main container 41 is made of heat-resistant materials such as silicone rubber, thermoplastic resin, or ceramic.

[0141] Generally speaking, when the temperature of the main body of plastic resin or silicone rubber rises, thermal expansion of about 3 / 1000 to 30 / 1000 occurs, which leads to an increase in the average distance between the constituent particles and further to an increase in volume.

[0142] As a process for fitting the silicon seal 22 tightly into the seal groove 43, the present invention utilizes the thermal expansion phenomenon of substances during heating. First, a silicon seal groove 43 of the main container is prepared, with an inner diameter designed to be the same as or smaller than the outer diameter of the seal 22 bonded to the heating plate 2 at room temperature. Next, the main container 4 is heated at an ambient temperature of approximately 100-150°C for 5-10 minutes to expand its volume, thereby allowing the silicon seal 22 bonded to the heating plate 2 to be inserted into the expanded seal groove 43 of the main container 4 without damage. Then, when the temperature of the main container 4 drops to room temperature, its volume will return to its original state and compress the outer contour of the silicon seal 22, thereby completing a waterproof structure that prevents water penetration through a seamless and tight fit.

[0143] Furthermore, regarding the bottom shape of the main container 4 and the heating plate 2 of the present invention, it is preferable to form a main container protrusion 45 on the outer side of the bottom of the main container.

[0144] In addition, it is advisable to form a protruding end 23 on the outer side of the bottom of the heating plate.

[0145] By means of one or more of the protruding structures, when the heating plate 2 is pressed down relative to the main container 4, the outer side of the ceramic waterproof and hydrophobic blanket insulation material 3 can be compressed more than the inner side, thereby reducing the pores on the outer side of the ceramic blanket insulation material, and further improving the waterproof effect by making it difficult for moisture to be transmitted to the heating layer.

[0146] (Experimental Example 1)

[0147] Waterproofing test of the present invention

[0148] * Testing organization: Korea Testing & Certification Institute (KTC)

[0149] Table 1

[0150]

[0151] [result]

[0152] Based on the aforementioned information, it can be confirmed that the structure of the valve groove 41, waterproof membrane 6, silicon seal 22 of the heating plate, and pressure regulating valve 5 of the main container according to the present invention can exhibit waterproof performance.

[0153] (Experimental Example 2)

[0154] Comparison test of the hydrophobicity of the heating layer of the prior art and the heating layer of the present invention

[0155] [result]

[0156] like Figure 8 As shown,

[0157] - The heating layer of the prior art (Photo 1) is made of hydrophilic material, so it will absorb water immediately when the material is immersed in water, and the adhesion between the tissues will gradually decrease after a certain period of time.

[0158] - The heating layer of the present invention (Photo 2) can exhibit hydrophobic properties even when immersed in water for more than 2 weeks.

[0159] - The inorganic hydrophobic agent of the present invention can maintain its hydrophobic function even at high temperatures of 400 to 500°C.

[0160] (Experimental Example 3)

[0161] Existing ceramic blanket insulation materials differ from the waterproof and hydrophobic ceramic waterproof and hydrophobic blanket insulation materials of this invention. Comparison Test

[0162] [result]

[0163] like Figure 9 As shown,

[0164] - Existing ceramic blanket insulation materials (Photo 1) will immediately absorb water to saturation when immersed in water and thus lose their function as insulation materials.

[0165] -The ceramic waterproof and hydrophobic blanket insulation material according to the present invention (Photo 2) can exhibit hydrophobic properties even when immersed in water for more than 2 weeks.

[0166] (Experimental Example 4)

[0167] Temperature under different combinations of fly ash, Fe3O4 powder, and rolled iron scale that affect the heating temperature Change (1)

[0168] Table 2

[0169]

[0170] ※ Heating error range ±5%, measured at the highest heating temperature

[0171] [Test Subjects]

[0172] - Circular metal plate: 190mm in diameter, 20mm in height, and 0.6mm in thickness.

[0173] - The heating layer used in the experiment was circular with a diameter of 150 mm and a thickness of 4 mm.

[0174] [Test Composition]

[0175] -Basic composition: Contains 40 parts by weight of sodium silicate, 1.5 parts by weight of acetic acid (99% concentration), and 5 parts by weight of inorganic hydrophobic agent relative to 100 parts by weight of water.

[0176] - Relative to the base binder composition, the addition of fly ash, Fe3O4 powder, and temperature variations during rolling of iron scale, as shown in the table, are as follows:

[0177] (result)

[0178] - It can be confirmed by the heating temperature during 3 minutes of heating in the table that the highest heating capacity is exhibited when mixed according to the combination ratio of test number (3).

[0179] (Experimental Example 5)

[0180] Temperature variations under different combinations of fly ash, Fe3O4 powder, and rolled iron scale that affect the heating temperature (2)

[0181] Table 3

[0182]

[0183] ※ Heating error range ±5%, measured at the highest heating temperature

[0184] [Test Subjects]

[0185] - Circular metal plate: 190mm in diameter, 20mm in height, and 0.6mm in thickness.

[0186] - The heating layer used in the experiment was circular with a diameter of 150 mm and a thickness of 4 mm.

[0187] [Test Composition]

[0188] -Basic composition: Contains 40 parts by weight of sodium silicate, 1.5 parts by weight of acetic acid (99% concentration), and 5 parts by weight of inorganic hydrophobic agent relative to 100 parts by weight of water.

[0189] - Relative to the base composition, the addition of fly ash, Fe3O4 powder, and temperature variations during the rolling of iron scale, as shown in the table above.

[0190] [result]

[0191] As shown in the table, various heating temperatures can be achieved by changing the composition.

[0192] (Experimental Example 6)

[0193] Comparison of heating temperatures under different rated high-frequency output powers of microwave ovens

[0194] Table 4

[0195]

[0196] ※ Heating error range ±5%, measured at the highest heating temperature

[0197] [Test Subjects]

[0198] - Circular plate: metallic, 190mm in diameter, 20mm in height, and 0.6mm in thickness.

[0199] - Heating layer (circular): Circular with a diameter of 150mm and a thickness of 4mm.

[0200] [Test Composition]

[0201] - Relative to 100 parts by weight of water, it contains 40 parts by weight of sodium silicate, 1.5 parts by weight of acetic acid (99% concentration), 5 parts by weight of inorganic hydrophobic agent, 10 parts by weight of fly ash, 20 parts by weight of Fe3O4 powder, and 700 parts by weight of rolled iron scale.

[0202] [result]

[0203] As shown in the table, the heating temperature varies depending on the type of microwave oven and its rated high-frequency output power.

[0204] Industry availability

[0205] As described above, this invention, as a microwave-enabled ceramic heating element, can convert secondary energy, namely electrical energy, into environmentally friendly and efficient tertiary energy. Therefore, it can reduce carbon dioxide, a major cause of global warming, produced from fossil fuels, namely natural gas, thereby reducing greenhouse gas emissions. It is a microwave-enabled, highly efficient ceramic heating cooking utensil that can be used in various applications such as microwave oven food cookers, microwave dryers, food processors, or water heaters.

Claims

1. A method for manufacturing a microwave cooker equipped with waterproof functionality and a high-performance ceramic heating element, characterized in that: This method is for manufacturing food cookware that utilizes the heating phenomenon where microwaves are converted into heat energy when they are projected onto a ceramic heating layer. After the pressure regulating valve (5) is attached to the perforated part of the main body container (4) equipped with the valve groove (41) and waterproof membrane (6) and ceramic waterproof and hydrophobic blanket insulation material are inserted inside, the heating plate (2) with the heating layer (21) mixed with the base adhesive or surface treated with hydrophobic reinforcing coating agent is attached to the silicon seal groove (43) of the main body container (4) by drying and hardening.

2. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: The valve groove (41), Formed in the main container (4), and comprising: The perforated portion (44) allows the pressure regulating valve (5) to be engaged; Multiple exhaust ribs (46) are formed on a portion of the inner side of the main body container (4); The exhaust port (47) is defined as the space between the plurality of exhaust ribs (46); The resting end (48) is formed at intervals on a portion or one side of the plurality of exhaust ribs (46); and, A cover (49) is formed on the outside of the main container (4) and can be engaged with the pressure regulating valve (5).

3. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: The valve groove (41) is formed in the main body container (4) and includes: a perforation (44) for engaging the pressure regulating valve (5); a plurality of exhaust ribs (46) formed on a portion of the inner side of the main body container (4); and an exhaust port (47) defined as the space between the plurality of exhaust ribs (46). The combination of the heating plate (2) and the main container (4) forms a sealed space (7) between the heating plate (2) and the main container (4). The waterproof membrane (6), Located between the main container (4) and the lower part of the ceramic waterproof and hydrophobic insulation material (3), The valve groove (41) is covered but the exhaust port (47) is open, so that air flows between the valve groove (41) and the sealed space (7). The material is made of a highly heat-resistant insulating material that allows microwaves to pass through.

4. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: The valve groove (41) is formed in the main body container (4) and includes: a perforation (44) for engaging the pressure regulating valve (5); a plurality of exhaust ribs (46) formed on a portion of the inner side of the main body container (4); and an exhaust port (47) defined as the space between the plurality of exhaust ribs (46). The pressure regulating valve (5), It is made of elastic silicone rubber and is bonded to the perforated portion (44). It includes a support platform (51) formed at the upper end, a cover (52) formed at the lower end, and a support column (53) connecting the support platform (51) and the cover (52). A recessed groove (56) is formed on the upper side of the cover (52), and a curved portion (54) is formed along the edge. One or more exhaust channels (57) are formed on the support platform (51) and the column (53) by cutting off a portion of them. Thermal expansion pressure is transmitted to the recessed groove (56) through the exhaust channel (57), which causes the curved portion (54) to bend and form a curved opening (55), thereby allowing the pressure to be discharged through the gap.

5. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: The pressure regulating valve (5), As a pressure relief structure, it is an opening and closing valve structure that relies on the elasticity of a spring. It is a structure in which a component that automatically opens and closes by means of the strength of pressure is inserted into the valve through port and moves up and down, including a connecting component with the main container, thereby automatically relieving pressure.

6. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: The base adhesive composition, It is prepared by stirring a mixture containing 30-50 parts by weight of sodium silicate, 1.5-2 parts by weight of 99% acetic acid, 10-70 parts by weight of fly ash, 22-220 parts by weight of Fe3O4 powder, and 5-10 parts by weight of inorganic hydrophobic agent, based on 100 parts by weight.

7. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 6, characterized in that: The Fe3O4 powder It contains nano-sized particles smaller than 200 mesh and has a purity of over 98%.

8. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 6, characterized in that: The inorganic hydrophobic agent It is a solution containing 5 to 10 parts by weight of hydrophobic nano silica powder or nano aerosol powder, based on a mixed solution of 100 parts by weight of 10 to 90 parts by weight of N-octyltriethoxysilane and 10 to 90 parts by weight of tetraethoxysilane. It is a highly heat-resistant inorganic hydrophobic agent.

9. The method for manufacturing a microwave cooker equipped with a waterproof function and a high-performance ceramic heating element according to claim 1, characterized in that: The heating layer is composed of a mixture of rolled iron scale with a particle size of less than 3 mm and a content of 80-95% Fe2O3 and FeO, based on 100 parts by weight of the base binder.

10. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: Hydrophobic reinforcing coating agent Based on a mixed solution of 100 parts by weight of 10-90 wt% N-octyltriethoxysilane and 10-90 wt% tetraethoxysilane, It is made by mixing 5 to 7 parts by weight of hydrophobic nano-silica powder or nano-aerosol powder and 3 to 10 parts by weight of nano-silica powder.

11. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: The surface treatment utilizing the hydrophobic reinforcing coating agent of the heating layer After spraying a hydrophobic reinforcing coating agent onto the surface of the heating layer, it is dried and cured in a tunnel drying oven at 250–350°C for 25–35 minutes.

12. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: The heating plate is metallic, and a heating layer composition is formed and pasted on the lower part of the plate in a planar shape such as a flat shape, a protruding shape or a recessed shape, and then dried and cured at 250-350°C for 25-35 minutes.

13. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: The ceramic waterproof and hydrophobic blanket insulation material (3), It is a porous ceramic fiber blanket structure containing two or more components selected from Al2O3, SiO2, CaO, MgO, ZrO2, silicate groups and alkoxysilyl groups, and is a ceramic blanket insulation material or aerosol blanket insulation material that uses hydrophobic silica material to surface treat the fiber structure or is contained in the fiber structure components.

14. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: The assembly process of attaching the heating plate (2) of the silicon seal (22) to the silicon seal groove (43) of the main container (4) involves heating the main container (4) at an ambient temperature of 100-150°C for 5-10 minutes to expand the volume of the seal groove (43) by means of thermal expansion, inserting and attaching the heating plate (2), and restoring the volume to its original state when the temperature of the main container (4) drops to room temperature, thereby pressing the elastic outer contour of the silicon seal and thereby fitting it tightly without gaps.

15. The method for manufacturing a microwave cooker equipped with waterproof function and high-performance ceramic heating element according to claim 1, characterized in that: During assembly, the outer contour of the ceramic waterproof and hydrophobic blanket insulation material (3) is compressed by one or more of the main container protrusion (45) forming the main container (4) or the plate protrusion (23) forming the heating plate (2).

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