Preparation method of high-purity quartz crystal electric cooker inner container

Abstract

The invention discloses a preparation method of a high-purity quartz crystal electric cooker inner container, the obtained electric cooker inner container is composed of an outer layer, an outer middle layer, an inner middle layer and an inner layer, zero-coating non-stick pan is achieved, and batch production can be achieved; the crystal electric cooker contains trace iron, calcium, zinc, selenium and other substances beneficial to the human body, and compared with other materials, the crystal electric cooker is safer and healthier.

Description

Technical Field

[0001] The invention belongs to the technical field of crystal cookers, and in particular relates to a method for preparing a high-purity quartz crystal rice cooker liner. Background Art

[0002] Existing rice cooker lining materials (aluminum, stainless steel, and Teflon coating) pose health risks, such as aluminum ion leaching and coating peeling, which can cause cancer. Ceramic linings are prone to lead and cadmium, and purple clay linings are difficult to control for impurities. Different coating materials and processes can affect the performance, lifespan, and safety of non-stick cookware. Continued use of a rice cooker after the coating has fallen off can be toxic. Rice cooker linings are often made with Teflon, a fluorine-containing polymer. This material is susceptible to corrosion from acidic substances, such as rice and meat, which can cause the coating to peel. If this coating enters the body, it cannot be decomposed and is not easily excreted. It may remain in the body for a long time. In severe cases, it may even cause cancer and lead to neurological degeneration. If excessive aluminum in the body invades the brain tissue, it may cause intellectual impairment, memory loss, Alzheimer's disease, and intellectual retardation in children. The Teflon raw materials produced by the coating can have a certain inhibitory effect on the activity of pepsin after entering the gastrointestinal tract, and then gastric acid secretion will be reduced, which may eventually cause digestive dysfunction. Studies have shown that when there is too much aluminum in the body, it can cause oxidative stress response in the body, causing cells to enter the aging state prematurely, thereby accelerating the aging of the body.

[0003] Crystal is a rare mineral with a unique crystal structure and high transparency. Due to its unique physical properties, such as high hardness, high gloss, and stable chemical properties, crystal is widely used in the production of high-end cookware. This invention uses a high-purity quartz crystal inner pot to achieve "zero coating, zero heavy metal" safe cooking. Summary of the Invention

[0004] The invention aims to provide a method for preparing a high-purity quartz crystal rice cooker liner.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A method for preparing a high-purity quartz crystal rice cooker liner, characterized in that it comprises the following steps: Step 1: Raw material purification: After peeling, removing impurities and crushing the natural crystal raw stone, purify it to a silicon dioxide SiO2 content of ≥99.98%; Step 2: Melting and molding: The purified crystal powder is melted in a high-temperature electric arc furnace at 7000℃-10000℃ and injected into the mold to form the outer layer of the inner tank; Step 3: Vacuum dripping: Under vacuum environment, micro-nano crystal powder with a purity of ≥99.999% is evenly dripped on the surface of the outer layer to form the middle layer of the inner liner; Step 4: Ion deposition: Silicon oxide ions with a purity of ≥99.9995% are deposited on the inner surface of the middle layer under high temperature and high pressure to form a mirror-grade inner layer; Step 5: Demolding and polishing: Demolding after cooling, frosting the outer layer, and retaining the crystalline growth structure of the inner layer.

[0006] Furthermore, the outer layer is a wear-resistant layer, the outer middle layer is a transition layer, the inner middle layer is a support layer, and the inner layer is a non-stick layer.

[0007] Furthermore, the melt molding step adopts a rotating tray dripping process with a dripping time of 48-72 hours to form a bubble-free transparent structure.

[0008] Furthermore, the inner pot releases far infrared rays with a wavelength of 8-14 μm and metasilicic acid H2SiO3 when heated.

[0009] An electric rice cooker inner pot is prepared by the method according to any one of claims 1 to 4, has a Mohs hardness of ≥7.0, and has an acid corrosion resistance 150 times that of stainless steel.

[0010] The above technical solution can achieve the following beneficial effects: The electric rice cooker inner pot obtained by the invention consists of four layers: an outer layer, an outer middle layer, an inner middle layer and an inner layer, so as to achieve a "0" coating non-stick pan and realize mass production.

[0011] Crystal rice cookers contain trace amounts of substances beneficial to the human body, such as iron, calcium, zinc, and selenium. Compared with other materials (aluminum can easily cause Alzheimer's disease, and the harm of heavy metals such as chromium, nickel, and manganese contained in stainless steel to the human body is well known), it is safer and healthier.

[0012] Crystal rice cookers are non-toxic, harmless, contain no heavy metals, and emit no radiation. Their unique piezoelectric effect and far-infrared properties also offer health benefits. Li Shizhen's Compendium of Materia Medica also notes that crystal is "pungent, cold, and non-toxic," and can treat "fright, palpitations, and heart heat; calms the mind, improves eyesight, removes red eyes, relieves heat and swelling, and treats cataracts." It can also treat "lung pain, vomiting pus, coughing, and shortness of breath," "benefit hair and improve complexion," and long-term use can "lighten the body and prolong life."

[0013] The crystal rice cooker is a non-stick pan without coating, which is easier to clean and has a lifelong non-stick effect.

[0014] The crystal pot heats up quickly and keeps heat well. After the heating stops, the food cools down slowly. The minerals it contains release trace elements into the food when heated, which has a healthy and nourishing effect on the human body. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with embodiments: Example 1

[0016] Step 1: Raw material purification Natural crystal raw stones are selected, mechanically crushed and then pickled (10% hydrofluoric acid, 2 hours) to remove metal impurities, and then purified by flotation to a SiO2 content of ≥99.99%.

[0017] Step 2: Melt-molding the outer layer Place the crystal powder in an electric arc furnace, melt it at 7500℃, inject it into a cylindrical graphite mold (inner shell prototype), cool it to 800℃ and keep it warm for 1 hour to eliminate internal stress.

[0018] Step 3: Vacuum instillation of the outer middle layer In a 10⁻³Pa vacuum environment, 99.999% pure crystal powder (particle size ≤ 100nm) was dripped at a speed of 0.05mm / s to form a 1mm thick transition layer.

[0019] Step 4: Ion deposition of inner layer At 1000°C and 6MPa, high-purity silane (SiH4) and oxygen are introduced to deposit silicon oxide ions on the surface of the middle layer for 48 hours, forming a 0.5mm thick mirror inner layer.

[0020] Step 5: Post-processing The top layer was sandblasted (aluminum oxide particles, Ra 1.2 μm), and the inner layer was polished with diamond polishing liquid to a roughness of ≤ 0.01 μm.

[0021] Based on the above embodiment 1: The non-stick performance was tested: after cooking rice 20 times, no residue was left when scraped with a spatula, which meets the GB / T 32095-2015 standard.

[0022] Corrosion resistance test: After immersion in citric acid solution with pH=1.5 for 30 days, the weight loss was less than 0.001%, which is in line with GB 4806.10-2016 standard.

[0023] Far infrared: 8-12μm wavelength radiation is detected during heating (ISO 20473 standard), with a sterilization rate of >99% (E. coli test). Example 2

[0024] In step 2, 1 wt% multi-walled carbon nanotubes (thermal conductivity ≥ 3000 W / m·K) were added to the outer layer of crystal powder to improve heating efficiency. The carbon nanotubes and crystal powder were ball-milled for 2 hours. In this embodiment, the heating rate was increased by 40%, the thermal conductivity was significantly improved, and the flexural strength was increased by 25%. Example 3

[0025] 3D printing gel injection molding is used to replace traditional drip injection, shortening the molding time, reducing the production cycle from 72 hours to 24 hours, and reducing raw material loss by 30%. Example 4

[0026] 0.5wt% magnesium silicate (MgSiO3) was added to the inner layer of crystal powder to promote the release of orthosilicic acid (H2SiO3). After boiling the water for 1 hour, the orthosilicic acid concentration was detected to be 1.2mg / L. Animal experiments showed that vascular elasticity increased by 8%.

[0027] The above are all preferred embodiments of the present invention. For ordinary technicians in this technical field, without departing from the principle of the present invention, various equivalent modifications to the present invention are within the scope of protection of the claims attached to this application.

Claims

1. A method for preparing a high-purity quartz crystal rice cooker liner, characterized in that: The following steps are involved: Step 1: Raw material purification: After peeling, removing impurities and crushing the natural crystal raw stone, purify it to a silicon dioxide SiO2 content of ≥99.98%; Step 2: Melting and molding: The purified crystal powder is melted in a high-temperature electric arc furnace at 7000℃-10000℃ and injected into the mold to form the outer layer of the inner tank; Step 3: Vacuum dripping: Under vacuum environment, micro-nano crystal powder with a purity of ≥99.999% is evenly dripped on the surface of the outer layer to form the middle layer of the inner liner; Step 4: Ion deposition: Silicon oxide ions with a purity of ≥99.9995% are deposited on the inner surface of the middle layer under high temperature and high pressure to form a mirror-grade inner layer; Step 5: Demolding and polishing: Demolding after cooling, frosting the outer layer, and retaining the crystalline growth structure of the inner layer.

2. The method for preparing a high-purity quartz crystal rice cooker liner according to claim 1, wherein: The outer layer is the wear-resistant layer), the outer middle layer is the transition layer, the inner middle layer is the support layer, and the inner layer is the non-stick layer.

3. The method for preparing a high-purity quartz crystal rice cooker liner according to claim 1, wherein: The melt molding step adopts a rotating tray dripping process with a dripping time of 48-72 hours to form a bubble-free transparent structure.

4. The method for preparing a high-purity quartz crystal rice cooker liner according to claim 1, wherein: The inner pot releases far infrared rays with a wavelength of 8-14μm and metasilicic acid H2SiO3 when heated.

5. An electric rice cooker liner, characterized in that: The steel sheet is prepared by the method according to any one of claims 1 to 4, has a Mohs hardness of ≥7.0, and has an acid corrosion resistance 150 times that of stainless steel.