Graphene-based light-weight pot and manufacturing process thereof
By using the design of graphene-enhanced thermal conductive layer and nano-aerogel thermal insulation layer in the pot, the problems of traditional pots with heavy weight, poor thermal conductivity and poor heat preservation effect are solved, achieving lightweight, efficient heat conduction and long-term heat preservation. effect.
Patent Information
- Application Number
- CN202411448044.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-01-21
AI Technical Summary
Traditional pots have problems such as heavy weight, poor thermal conductivity, poor thermal insulation effect, and poor non-stick performance, which is difficult to meet consumers' demand for high-quality pots.
A lightweight pot design based on graphene is used, including a food-grade non-stick coating, a functional powder layer, a graphene-enhanced thermal conductive layer and a nano-aerogel thermal insulation layer. The thermal conductive layer and thermal insulation layer are constructed through hot pressing and pasting methods. , combined with a variety of advanced materials and processes.
It achieves the pot's lightweight, high-speed thermal conductivity, good magnetic conductivity and long-term heat preservation effect, ensuring the pot's safety, reliability and efficient cooking performance.
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of kitchenware manufacturing technology, and in particular to a graphene-based lightweight cookware and a manufacturing process thereof. Background Art
[0002] As people's living standards improve, the requirements for cookware are getting higher and higher. Traditional cookware often has problems such as heavy weight, poor thermal conductivity, poor thermal insulation, and unsatisfactory non-stick performance. In order to meet consumers' demand for high-quality cookware, it is necessary to develop a cookware that is lightweight, fast in thermal conductivity, magnetic, has good thermal insulation, and is safe and reliable. As a new material with excellent performance, graphene's high thermal conductivity, high strength and good chemical stability make innovative design of cookware possible. At the same time, the application of nano aerogel insulation materials also provides a new solution for improving the thermal insulation performance of cookware. Summary of the invention
[0003] In view of the deficiencies of the prior art, the technical solution adopted by the present invention to solve the technical problems is: a graphene-based lightweight cookware, comprising a pot body and a pot cover, wherein the pot body is composed of a food-grade non-stick coating, a functional powder layer, a graphene-enhanced heat-conducting layer, and a nano-aerogel heat-insulating layer and a shell composite layer from the inside to the outside; wherein the functional powder layer is composed of 30% graphene, 10% short-fiber carbon fiber powder, 10% bamboo charcoal powder, 25% kaolin, 10% potassium feldspar, 2% boric acid, and 8% frit by weight percentage; the graphene-enhanced heat-conducting layer is formed by the graphene in the functional powder layer and the heat-conducting material; the nano-aerogel heat-insulating layer and the shell composite layer are closely combined by the nano-aerogel heat-insulating material and the shell;
[0004] The cookware has the following features: weight between 800g and 1200g, height between 8cm and 10cm when the cookware diameter is 30cm, dimensional tolerance within ±0.5mm, thermal conductivity above 45W / (m·K), good magnetic conductivity, thermal insulation performance that keeps the temperature inside the pot stable at above 80°C within 2 hours, smooth surface, uniform color, no scratches, no bubbles, and no deformation.
[0005] Preferably, the cookware is light, has fast heat conduction and is magnetically conductive.
[0006] A manufacturing process of a graphene-based lightweight cookware comprises the following steps:
[0007] Step 1: Prepare raw materials, and make sure that the raw materials graphene, powder materials, colloid materials, non-stick coating materials, and nano-aerogel insulation materials meet the quality standards. The specific standards are as follows:
[0008] Graphene: purity not less than 99.5%, sheet diameter between 5 microns and 10 microns, number of layers between 3 and 5;
[0009] Short fiber carbon fiber powder: fiber length is 3 mm to 5 mm, carbon content is not less than 95%;
[0010] Bamboo charcoal powder: fineness is between 200 mesh and 300 mesh, and iodine adsorption value is not less than 800 mg / g;
[0011] Kaolin: Alumina content is between 35% and 40%, silica content is between 45% and 50%;
[0012] Potassium feldspar: potassium oxide content is 10% to 12%, sodium oxide content is 3% to 5%;
[0013] Boric acid: purity not less than 99%;
[0014] Frit: softening point is between 700℃ and 800℃, expansion coefficient is between 4×10-6 / ℃ and 6×10-6 / ℃;
[0015] Phenolic resin: viscosity is 5000mPa·s to 8000mPa·s, solid content is 70% to 80%;
[0016] Polyvinyl butyral: viscosity is between 2000mPa·s and 3000mPa·s, and acetal degree is between 70% and 80%;
[0017] Alcohol: purity not less than 99.5%;
[0018] Non-stick coating material: hardness is between 2H and 3H, and adhesion is not less than level 3;
[0019] Nano aerogel insulation material: thermal conductivity is not higher than 0.02W / (m·K), density is 100kg / m 3 Up to 150kg / m 3 ;
[0020] Conduct incoming inspection on each batch of raw materials, including appearance inspection, chemical composition analysis, and physical property testing; store raw materials to avoid moisture, contamination, and deterioration, and establish a raw material inventory management system to ensure first-in-first-out of raw materials; the raw material storage environment temperature is between 15℃ and 25℃, and the relative humidity is between 40% and 60%;
[0021] Step 2: Powder mixing: weigh 30% of graphene, 10% of short fiber carbon fiber powder, 10% of bamboo charcoal powder, 25% of kaolin, 10% of potassium feldspar, 2% of boric acid, and 8% of frit by weight, mix them evenly to obtain functional powder, and use a high-speed mixer to mix them. The mixing time is controlled to be 30 minutes to 45 minutes, and the stirring speed is 1500 rpm to 2000 rpm; the mixing environment is required to be clean and dust-free, the temperature is 20°C to 25°C, and the relative humidity is 45% to 55%;
[0022] Step 3: colloid preparation, weigh 10% phenolic resin, 5% polyvinyl butyral and 85% alcohol, mix and stir evenly to obtain colloid, the preparation environment requires temperature between 22°C and 25°C, relative humidity between 40% and 50%, avoid direct sunlight;
[0023] Step 4: Pressing and molding: Use a 2000-ton punching machine to press the mixed material into the shape and thickness of a round pan to obtain a functional powder layer. Select a mold to ensure the shape and dimensional accuracy of the pot. Control the pressure to 1800 to 2000 tons and the pressing time to 15 to 20 minutes. The molding environment requires a temperature of 20°C to 25°C, a relative humidity of 45% to 55%, and no strong vibration sources around.
[0024] Step 5: Construct a thermal conductive layer. Outside the functional powder layer, a graphene enhanced thermal conductive layer is constructed by hot pressing. After mixing graphene and thermal conductive material in a ratio of 1:1, first, a thin sheet or film material is formed by roller pressing, and then it is tightly combined with the functional powder layer by a hot press. The temperature of the hot press is set at 180°C to 200°C, and the pressure is 12MPa to 15MPa. The hot pressing time is between 20 minutes and 30 minutes according to the material thickness and performance requirements. During the hot pressing process, the pressure is evenly distributed so that the graphene enhanced thermal conductive layer is fully combined with the functional powder layer. The hot pressing environment requires a stable temperature of 190°C to 200°C, a relative humidity of 40% to 50%, and dust-free and good ventilation;
[0025] Step 6: Lay the insulation layer. Lay the nano-aerogel insulation material outside the graphene enhanced thermal conductive layer by direct pasting. At the same time, it is tightly compounded with the shell to form a composite layer of the nano-aerogel insulation layer and the shell. Select an organic silicon high temperature resistant adhesive and mix the organic silicon high temperature resistant adhesive with a diluent in a ratio of 3:1. During the mixing process, use a stirring device to stir at 800 rpm for 20 minutes. Observe the viscosity change while stirring, and adjust the viscosity by gradually adding diluent until the viscosity is The viscosity reaches between 8000mPa·s and 10000mPa·s. The viscosity in the preparation process is monitored in real time using a viscometer. The adhesive is evenly applied to the bonding surface of the nano-aerogel material and the graphene enhanced thermal conductive layer. Then the nano-aerogel material is gently pressed on the surface of the pot to ensure that there are no bubbles or gaps. After pasting, it is pressurized and fixed. The adhesive is cured for 36 to 48 hours. The laying environment requires a temperature of 20°C to 25°C, a relative humidity of 45% to 55%, and no dust or debris.
[0026] Step 7: Coating application: select tetrafluoroethylene and apply it to the innermost layer of the pot body by spraying to form a food-grade non-stick coating. Ensure that the thickness of the coating is uniform. Use spraying equipment to control the spraying pressure to 0.4MPa to 0.5MPa and the spraying speed to 100mm / s to 120mm / s. The spraying environment is required to be clean and dust-free, with a temperature of 22℃ to 25℃, a relative humidity of 40% to 50%, and good ventilation to quickly discharge volatiles.
[0027] Step 8: Assemble and package. Assemble the cookware to ensure that all parts are firmly connected and not loose. Select packaging materials and methods to package and protect the cookware. The packaging materials are food-grade polyethylene film bags for the inner packaging, foam plastic boards and pearl cotton for the middle buffer, and double-layer corrugated boxes for the outer packaging. Print product information, warning signs and handling instructions on the surface of the corrugated boxes. The packaging method is to package the pot body and the lid separately. Wrap the pot body and the lid with polyethylene film bags respectively, and then put them in the corresponding buffering materials. Add foam particle fillers between the packaging of the pot body and the lid. For overall packaging, for small pots or set pots, package the pot body and the lid together. Before packaging, ensure that there is enough buffering material between the pot body and the lid to prevent mutual friction and collision. You can use cable ties or tape to fix the pot in the packaging. After packaging is completed, use tape to seal the opening of the corrugated box. The assembly and packaging environment requires a temperature of 20℃ to 25℃, a relative humidity of 45% to 55%, and a clean and tidy environment without pollution sources.
[0028] Preferably, ultrasonic dispersion technology is used to disperse the graphene and other powder components in the functional powder layer to improve the uniformity of graphene in the cookware material. The specific operation is to place the mixed functional powder in an ultrasonic device and perform ultrasonic treatment at a power of 500 W and a frequency of 40 kHz for 30 minutes.
[0029] Preferably, the surface of the cookware is treated with graphene spraying to improve the performance of the graphene enhanced thermal conductive layer, which is used to enhance the thermal conductivity and durability of the cookware. Using graphene spraying equipment, the surface of the thermal conductive layer is evenly sprayed with graphene material to form a coating with a thickness of 0.1 mm to 0.2 mm.
[0030] Preferably, graphene and ceramic materials are compounded by hot pressing composite technology to improve the strength and stability of the cookware. The graphene and ceramic materials are placed in a hot press in a ratio of 1:2. The graphene and ceramic materials are arranged in an alternating stack and hot pressed for 40 to 60 minutes at a temperature of 250°C to 300°C and a pressure of 15 MPa to 20 MPa.
[0031] Preferably, the cookware containing graphene is subjected to a photocuring treatment to improve the bonding strength between the graphene and other materials, and the cookware is irradiated with a light source with a wavelength of 365nm and a power of 1000W, and the irradiation time is 30 minutes to 40 minutes.
[0032] Preferably, the packaging material is a food-grade polyimide film, and the graphene is packaged by a hot pressing method. First, the food-grade polyimide film is cut and covered on the part containing the graphene, and then a hot press is used to perform hot pressing and bonding at a temperature of 180°C to 200°C and a pressure of 5MPa to 8MPa, so that the polyimide film is tightly wrapped around the graphene surface to form a packaging layer.
[0033] Preferably, the material properties and thickness range of the food-grade non-stick coating are 0.15 mm to 0.2 mm in thickness, and the material is polytetrafluoroethylene. The coating process is as follows: first, the innermost layer of the pot body is cleaned to remove surface oil and impurities, and then the polytetrafluoroethylene powder is evenly sprayed on the surface of the pot body by electrostatic spraying. During electrostatic spraying, the voltage of the spray gun is controlled at 50 kV to 80 kV, the spraying distance is 20 cm to 30 cm, and the spraying speed is 100 g to 150 g of powder per minute. After spraying, the pot is placed in an oven for curing at a curing temperature of 380°C to 400°C and a curing time of 20 minutes to 30 minutes. After curing, the polytetrafluoroethylene coating is firmly attached to the surface of the pot body to form a food-grade non-stick coating.
[0034] Preferably, the shell material of the shell composite layer is stainless steel, and the shell is composited with the nano aerogel thermal insulation material through a welding process.
[0035] The beneficial effects of the present invention are as follows:
[0036] The design of the cooker fully considers the actual use needs of users. By carefully selecting and combining various materials, the weight of the cooker is controlled between 800 grams and 1200 grams. This weight range makes it easy for both professional chefs and ordinary housewives to pick up, move and operate the cooker. In modern fast-paced life, people often need to carry cookers for outdoor cooking or travel. The lightweight characteristics of this cooker undoubtedly provide great convenience for users. Whether it is placed in a backpack or carried by hand, it will not bring a heavy burden to the user, so that cooking is no longer restricted by location, and a delicious cooking experience can be enjoyed anytime, anywhere.
[0037] The thermal conductivity of a cookware is one of the important indicators of its quality. The graphene-enhanced thermal conductive layer in this solution plays a key role. Combined with a variety of advanced thermal conductive technologies, the thermal conductivity of the cookware is as high as 45W / (m·K) or more. As a new type of material with ultra-high thermal conductivity, graphene can quickly and evenly transfer heat to the entire pot, greatly shortening the cooking time. Whether it is quickly frying vegetables or stewing meat, it can be completed in a shorter time, which not only saves energy but also improves cooking efficiency. The thermal conductive layer constructed by hot pressing and technical means such as graphene spraying treatment further enhance the thermal conductivity, ensure that heat can be distributed quickly and evenly, avoid local overheating or overcooling, and make the cooking process more stable and reliable. This not only brings an efficient cooking experience to users, but also better preserves the nutrients and taste of food.
[0038] Cookware with good magnetic conductivity can adapt to a variety of heating methods, providing users with more choices. This cookware has excellent magnetic conductivity, and it can be perfectly matched with induction cookers, gas stoves or other heating equipment. In modern kitchens, different heating equipment has its own advantages and applicable scenarios, and the magnetic conductivity of this cookware allows users to flexibly choose heating methods according to actual conditions to meet different cooking needs. Whether in a home kitchen, outdoor camping or commercial kitchen, it can exert stable performance and bring users a convenient cooking experience.
[0039] The application of nano-aerogel insulation layer is a highlight of this solution. This advanced insulation material can keep the temperature in the pot stable at above 80°C within 2 hours, greatly reducing energy waste. During the cooking process, once the food reaches the required temperature, the insulation layer can effectively maintain the temperature in the pot and avoid rapid heat loss. This not only saves energy and reduces cooking costs, but also keeps food warm for a longer period of time, so that you can enjoy delicious meals at any time. For dishes that require long-term stewing, insulation performance is particularly important. It can ensure that the food is always kept at a suitable temperature during the cooking process, making the cooking effect even better.
[0040] Food safety is the focus of people's attention. This cookware strictly follows food-grade safety standards in material selection and manufacturing process. The food-grade non-stick coating is made of polytetrafluoroethylene and is processed through a strict coating process to ensure that the coating is firmly attached to the surface of the pot and will not easily fall off or release harmful substances. At the same time, the graphene is encapsulated with food-grade polyimide film, which further improves the safety of the cookware. During the production process, the raw materials are strictly screened and inspected to ensure that each material meets food-grade safety standards. This high level of safety protection provides users with a healthy and secure cooking environment, allowing users to cook a variety of delicacies with peace of mind without worrying about food safety issues.
[0041] The strength and stability of the cookware have been significantly improved through various means such as hot-pressing composite technology of graphene and ceramic materials, light curing treatment, and packaging treatment. The combination of graphene and ceramic materials makes the cookware more resistant to pressure, impact and wear, and can withstand various external forces in daily cooking. The light curing treatment enhances the bonding strength between graphene and other materials, ensuring that the cookware will not delaminate or fall off during long-term use. The packaging treatment further protects the graphene and extends the service life of the cookware. The combined application of these technologies makes this cookware have excellent durability, able to stand the test of time, and provide users with long-term and reliable cooking tools. DETAILED DESCRIPTION
[0042] The present invention is further described in detail below in conjunction with specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.
[0043] Example:
[0044] Raw material preparation and control: In the production process of the graphene-based lightweight cookware, the preparation of raw materials is the first crucial step. First, strictly screen the raw material suppliers, and carefully select graphene and other powder materials (such as short fiber carbon fiber powder, bamboo charcoal powder, kaolin, potassium feldspar, frit, etc.), colloid materials (phenolic resin, polyvinyl butyral, alcohol, etc.), non-stick coating materials and nano aerogel insulation materials to ensure that each material meets strict quality standards.
[0045] For graphene, the purity is required to be no less than 99.5%, the sheet diameter is 5 microns to 10 microns, and the number of layers is 3 to 5 layers. The fiber length of short fiber carbon fiber powder is 3 mm to 5 mm, and the carbon content is not less than 95%. The fineness of bamboo charcoal powder is 200 mesh to 300 mesh, and the iodine adsorption value is not less than 800 mg / g. The aluminum oxide content of kaolin is 35% to 40%, and the silicon dioxide content is 45% to 50%. The potassium oxide content of potassium feldspar is 10% to 12%, and the sodium oxide content is 3% to 5%. The purity of boric acid is not less than 99%. The softening point of the melt is 700℃ to 800℃, and the expansion coefficient is 4×10 -6 / ℃ to 6×10 -6 / ℃. The viscosity of phenolic resin is between 5000mPa·s and 8000mPa·s, and the solid content is between 70% and 80%. The viscosity of polyvinyl butyral is between 2000mPa·s and 3000mPa·s, and the acetal degree is between 70% and 80%. The purity of alcohol is not less than 99.5%. The hardness of non-stick coating material is between 2H and 3H, and the adhesion is not less than level 3. The thermal conductivity of nano aerogel insulation material is not higher than 0.02W / (m·K), and the density is 100kg / m 3 Up to 150kg / m 3 .
[0046] Conduct a comprehensive incoming inspection on each batch of raw materials, including visual inspection to ensure that the materials have no obvious defects; conduct chemical composition analysis to verify that its composition meets the standard requirements; and conduct physical property tests such as hardness, viscosity, thermal conductivity and other indicators. At the same time, the raw materials are properly stored to avoid moisture, contamination and deterioration. Establish an advanced raw material inventory management system to ensure that raw materials follow the principle of first-in-first-out. Strictly control the storage environment of raw materials, keep the temperature at 15℃ to 25℃, and the relative humidity at 40% to 60%, to provide suitable storage conditions for raw materials.
[0047] Fine implementation of the production process, powder mixing: weigh 30% graphene, 10% short fiber carbon fiber powder, 10% bamboo charcoal powder, 25% kaolin, 10% potassium feldspar, 2% boric acid, 8% frit according to the precise weight percentage, and mix these materials evenly to obtain functional powder. Use a high-speed mixer for mixing, strictly control the mixing time to 30 minutes to 45 minutes, and the stirring speed to 1500 rpm to 2000 rpm. Ensure that the mixing environment is clean and dust-free, the temperature is between 20℃ and 25℃, and the relative humidity is between 45% and 55% to ensure the uniformity and stability of the mixing.
[0048] Colloid preparation: Weigh 10% phenolic resin, 5% polyvinyl butyral and 85% alcohol, mix and stir evenly under specific environmental conditions to obtain colloid. The preparation environment requires a temperature of 22°C to 25°C, a relative humidity of 40% to 50%, and avoid direct sunlight to ensure the stability of the colloid's performance.
[0049] Pressing: Use a 2000-ton punching machine to press the mixed material into a round pan shape and a suitable thickness to obtain a functional powder layer. Carefully select the mold to ensure that the shape and size accuracy of the pot reach a high standard. Control the pressure size to 1800 tons to 2000 tons, and the pressing time is 15 minutes to 20 minutes. The molding environment requires a temperature of 20℃ to 25℃, a relative humidity of 45% to 55%, and no strong vibration source around to ensure the stability of the molding process and the quality of the pot.
[0050] Constructing the thermal conductive layer: Outside the functional powder layer, a graphene enhanced thermal conductive layer is constructed by hot pressing. After mixing graphene and thermal conductive material in a 1:1 ratio, they are rolled into thin sheets or film-like materials, and then tightly combined with the functional powder layer using a hot press. The temperature of the hot press is set at 180°C to 200°C, the pressure is 12MPa to 15MPa, and the hot pressing time is between 20 minutes and 30 minutes depending on the material thickness and performance requirements. During the hot pressing process, ensure that the pressure is evenly distributed so that the graphene enhanced thermal conductive layer is fully combined with the functional powder layer. The hot pressing environment requires a stable temperature of 190°C to 200°C, a relative humidity of 40% to 50%, and dust-free and well ventilated to provide optimal conditions for the construction of the thermal conductive layer.
[0051] Laying the insulation layer: The nano-aerogel insulation material is laid outside the graphene enhanced thermal conductive layer by direct pasting, and at the same time, it is tightly compounded with the shell to form a composite layer of the nano-aerogel insulation layer and the shell. Use an organic silicon high temperature resistant adhesive and mix the organic silicon high temperature resistant adhesive with a diluent in a ratio of 3:1. During the mixing process, use a stirring device to stir at 800 rpm for 20 minutes, observe the viscosity change while stirring, and adjust the viscosity by gradually adding diluent until the viscosity reaches between 8000mPa·s and 10000mPa·s. Use a viscometer to monitor the viscosity in real time during the preparation process. Apply the adhesive evenly on the bonding surface of the nano-aerogel material and the graphene enhanced thermal conductive layer, and then gently press the nano-aerogel material on the surface of the pot to ensure that there are no bubbles and no gaps. After pasting, pressurize and fix, and wait for the adhesive to cure, and the curing time is 36 hours to 48 hours. The laying environment requires a temperature of 20℃ to 25℃, a relative humidity of 45% to 55%, and no dust or debris to ensure the laying quality of the insulation layer.
[0052] Coating application: Choose tetrafluoroethylene and apply it to the innermost layer of the pot body by spraying to form a food-grade non-stick coating. Use advanced spraying equipment to strictly control the spraying pressure to 0.4MPa to 0.5MPa and the spraying speed to 100mm / s to 120mm / s. The spraying environment requires clean and dust-free, the temperature is between 22℃ and 25℃, the relative humidity is between 40% and 50%, and the ventilation is good to quickly discharge volatiles to ensure the uniformity and stability of the coating. Assembly and packaging: Perform fine assembly operations on the pots to ensure that all parts are firmly connected and not loose. Choose appropriate packaging materials and methods to package and protect the pots. The packaging material is that the inner packaging is wrapped with food-grade polyethylene film bags, the middle buffer uses foam plastic boards and pearl cotton, and the outer packaging uses double-layer corrugated paper boxes. Product information, warning signs and handling instructions are printed on the surface of the corrugated paper boxes. The packaging method is to pack the pot body and the pot lid separately, wrap the pot body and the pot lid with polyethylene film bags respectively, and then put them into the corresponding buffer materials. Add foam particle filler between the packaging of the pot body and the pot lid. For small pots or set pots, the pot body and the pot lid can be packaged together. Before packaging, ensure that there is enough cushioning material between the pot body and the pot lid to prevent mutual friction and collision. You can use cable ties or tape to fix the pot in the package. After packaging, use tape to seal the opening of the corrugated box. The assembly and packaging environment requires a temperature of 20℃ to 25℃, a relative humidity of 45% to 55%, clean and tidy without pollution sources, to provide good protection and display for the pots.
[0053] The comprehensive application of technical optimization uses ultrasonic dispersion technology to disperse graphene and other powder components in the functional powder layer. The mixed functional powder is placed in an ultrasonic device and ultrasonically treated for 30 minutes at a power of 500W and a frequency of 40kHz to improve the uniformity of graphene in the cookware material, thereby improving the overall performance of the cookware.
[0054] The surface of the cookware is treated with graphene spraying. Using graphene spraying equipment, graphene material is evenly sprayed on the surface of the heat-conducting layer to form a coating with a thickness of 0.1 mm to 0.2 mm. This treatment can improve the performance of the graphene-enhanced heat-conducting layer, enhance the thermal conductivity and durability of the cookware, and extend the service life of the cookware.
[0055] Graphene and ceramic materials are compounded through hot pressing technology. Graphene and ceramic materials are placed in a hot press in a ratio of 1:2. Graphene and ceramic materials are arranged in alternating layers and hot pressed for 40 to 60 minutes at a temperature of 250°C to 300°C and a pressure of 15MPa to 20MPa. This composite technology can improve the strength and stability of the cookware, allowing it to withstand greater external force and pressure.
[0056] The cookware containing graphene is subjected to light curing. The cookware is irradiated with a light source with a wavelength of 365nm and a power of 1000W for 30 to 40 minutes. Light curing can improve the bonding strength between graphene and other materials, ensuring that the cookware will not delaminate or fall off during long-term use.
[0057] The packaging material is food-grade polyimide film, and the graphene is packaged by hot pressing. First, the food-grade polyimide film is cut and covered on the part containing graphene, and then hot pressing is performed using a hot press at a temperature of 180°C to 200°C and a pressure of 5MPa to 8MPa, so that the polyimide film is tightly wrapped on the graphene surface to form a packaging layer. This packaging process can further improve the safety and stability of the cookware.
[0058] Strict application of food-grade non-stick coating. The material is polytetrafluoroethylene with a thickness of 0.15 mm to 0.2 mm. The coating process is as follows: first, the innermost layer of the pot body is cleaned to remove oil and impurities on the surface, and then the polytetrafluoroethylene powder is evenly sprayed on the surface of the pot body by electrostatic spraying. During electrostatic spraying, the voltage of the spray gun is controlled at 50kV to 80kV, the spraying distance is 20 cm to 30 cm, and the spraying speed is 100 grams to 150 grams of powder per minute. After spraying, the pot is placed in an oven for curing. The curing temperature is 380℃ to 400℃ and the curing time is 20 minutes to 30 minutes. After curing, the polytetrafluoroethylene coating is firmly attached to the surface of the pot body to form a food-grade non-stick coating, providing users with a safe and healthy cooking experience.
[0059] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.
Claims
1. A graphene-based lightweight cookware, characterized in that: The invention comprises a pot body and a pot cover, wherein the pot body is composed of a food-grade non-stick coating, a functional powder layer, a graphene-enhanced heat-conducting layer, and a nano-aerogel heat-insulating layer and a shell composite layer from the inside to the outside; wherein the functional powder layer is composed of 30% graphene, 10% short-fiber carbon fiber powder, 10% bamboo charcoal powder, 25% kaolin, 10% potassium feldspar, 2% boric acid, and 8% frit by weight percentage; the graphene-enhanced heat-conducting layer is formed by the graphene in the functional powder layer and the heat-conducting material; the nano-aerogel heat-insulating layer and the shell composite layer are formed by the nano-aerogel heat-insulating material being tightly combined with the shell; The cookware has the following characteristics: a weight of 800 g to 1200 g, a height of 8 cm to 10 cm when the cookware diameter is 30 cm, a dimensional tolerance of ±0.5 mm, a thermal conductivity of more than 45 W / (m·K), and a heat preservation performance that keeps the temperature inside the cooker stable at more than 80°C within 2 hours.
2. A process for manufacturing lightweight cookware based on graphene, characterized in that: The following steps are involved: Step 1: Determine the raw materials graphene, powder materials, colloid materials, non-stick coating materials, and nano aerogel insulation materials; Step 2: Weigh 30% of graphene, 10% of short fiber carbon fiber powder, 10% of bamboo charcoal powder, 25% of kaolin, 10% of potassium feldspar, 2% of boric acid, and 8% of frit by weight, mix them evenly, and obtain functional powder; Step 3: Weigh 10% of phenolic resin, 5% of polyvinyl butyral and 85% of alcohol, mix and stir evenly to obtain a colloid; Step 4: Press the mixed material into a round pan shape and thickness to obtain a functional powder layer; Step 5: Outside the functional powder layer, a graphene enhanced thermal conductive layer is constructed by hot pressing, and graphene and thermal conductive material are mixed in a ratio of 1:1; Step 6: Lay the nano-aerogel insulation material outside the graphene enhanced thermal conductive layer by direct pasting method, and at the same time, closely compound it with the shell to form a composite layer of the nano-aerogel insulation layer and the shell; Step 7: Select tetrafluoroethylene and apply it to the innermost layer of the pot body by spraying. Use spraying equipment to control the spraying pressure to 0.4MPa to 0.5MPa and the spraying speed to 100mm / s to 120mm / s. The spraying environment temperature is 22℃ to 25℃ and the relative humidity is 40% to 50%. Step 8: Assemble and package. Assemble the cookware, select packaging materials and methods, and package and protect the cookware. The packaging materials are: the inner packaging is wrapped in food-grade polyethylene film bags, the middle cushioning uses foam plastic boards and pearl cotton, and the outer packaging uses double-layer corrugated cardboard boxes. Print product information, warning signs and handling instructions on the surface of the corrugated cardboard boxes; the packaging method is to package the pot body and the lid separately, wrap the pot body and the lid with polyethylene film bags respectively, and then put them in the corresponding cushioning materials, and add foam particle fillers between the packaging of the pot body and the lid; after packaging, use tape to seal the opening of the corrugated cardboard box. The assembly and packaging environment requires a temperature of 20℃ to 25℃, a relative humidity of 45% to 55%, and a clean and tidy environment without pollution sources.
3. According to the manufacturing process of a graphene-based lightweight cookware according to claim 2, the graphene in the functional powder layer is dispersed by ultrasonic dispersion technology at a power of 500 W and a frequency of 40 kHz for 30 minutes.
4. According to the manufacturing process of a graphene-based lightweight cookware according to claim 2, the surface of the cookware is subjected to graphene spraying treatment, and the graphene material is evenly sprayed on the surface of the heat conductive layer using graphene spraying equipment to form a coating with a thickness of 0.1 mm to 0.2 mm.
5. According to the manufacturing process of a graphene-based lightweight cookware according to claim 2, the graphene and ceramic materials are compounded by hot pressing composite technology, and the graphene and ceramic materials are placed in a hot press in a ratio of 1:
2. The graphene and ceramic materials are arranged in an alternating stacking manner and hot pressed for 40 to 60 minutes at a temperature of 250°C to 300°C and a pressure of 15 MPa to 20 MPa.
6. According to the manufacturing process of a graphene-based lightweight cookware according to claim 2, the cookware containing graphene is photocured, and the cookware is irradiated with a light source with a wavelength of 365nm and a power of 1000W, and the irradiation time is 30 minutes to 40 minutes.
7. According to the manufacturing process of a graphene-based lightweight cookware described in claim 2, the packaging material is a food-grade polyimide film, and the graphene is packaged by a hot pressing and bonding method. The food-grade polyimide film is cut and covered on the part containing the graphene, and a hot press is used to perform hot pressing and bonding at a temperature of 180°C to 200°C and a pressure of 5MPa to 8MPa, so that the polyimide film is tightly wrapped on the surface of the graphene to form a packaging layer.
8. According to the graphene-based lightweight cookware according to claim 1, the thickness of the food-grade non-stick coating is 0.15 mm to 0.2 mm, the material is polytetrafluoroethylene, and the coating process is as follows: the innermost layer of the pot body is cleaned to remove surface oil and impurities, and polytetrafluoroethylene powder is evenly sprayed on the surface of the pot body by electrostatic spraying. During electrostatic spraying, the voltage of the spray gun is controlled at 50 kV to 80 kV, the spraying distance is 20 cm to 30 cm, and the spraying speed is 100 g to 150 g of powder per minute. After spraying, the pot is placed in an oven for curing treatment, the curing temperature is 380°C to 400°C, and the curing time is 20 minutes to 30 minutes. After curing, the polytetrafluoroethylene coating is firmly attached to the surface of the pot body to form a food-grade non-stick coating.
9. According to the graphene-based lightweight cookware of claim 1, the shell material of the shell composite layer is stainless steel, and the shell is composited with the nano aerogel insulation material through a welding process.