Range hood with sterilization and peculiar smell removal functions

Abstract

The invention discloses a range hood with sterilization and peculiar smell removal functions, which comprises a range hood main body, and a mounting groove for mounting the edge of a filter screen is formed in the range hood main body; the graphene reinforced composite buffer layer is of a'surface layer-middle layer-bottom layer 'sandwich structure, the graphene reinforced composite buffer layer sequentially comprises a surface layer system, a middle reinforced layer and a bottom layer gel system from bottom to top, the graphene reinforced composite buffer layer is composed of a SiO2-Al2O3-Gr composite gel matrix, the molar ratio of surface amino to carboxyl is 1: 1.2-1.5, the molar ratio of the middle reinforced layer to the bottom layer gel system is 1: 1.2-1.5, and the molar ratio of the surface system to the middle reinforced layer to the bottom layer gel system is 1: 1.2-1.5. The coating is prepared from the following components in percentage by weight: 0.3 to 0.6 percent of carboxylated carbon nanotube, 0.5 to 1.2 percent of aminated graphene, 0.5 to 1.0 percent of nano ZnO, 1.0 to 1.2 percent of carbomer 940 and 5.5 to 6.5 percent of glycerol. Carbomer and glycerin in the bottom layer gel cooperate in the graphene reinforced composite buffer layer, so that the height of a bulge in 168 h can be reduced to 69 [mu] m from 198 [mu] m of a blank group, and the reduction amplitude reaches 65.2%; the permanent deformation rate is reduced from 28.5% to 12.0%; and the bulging starting time is prolonged to 63 hours from 18 hours and is increased by 2.5 times.

Description

Technical Field

[0001] This invention relates to a range hood with sterilization and odor removal functions. Background Technology

[0002] In range hood systems, filters (such as oil filters or metal filters) are typically fixed by mounting brackets with grooves to embed the filter edges for sealing and stable support. However, during long-term use, due to oil fume accumulation, high-temperature environments, and mechanical vibrations, bulging (localized bulging or deformation) can easily occur at the contact interface between the mounting groove and the filter. Existing technologies address this bulging problem by filling the space between the mounting groove and the filter with elastic materials (such as rubber gaskets, silicone sealing strips, or high-temperature resistant foam), using the material's compression and rebound properties to compensate for deformation. However, these technologies have the following drawbacks:

[0003] Insufficient high temperature resistance: When exposed to high-temperature oil fume environment for a long time, the elastic material is prone to aging, hardening or cracking, and loses its sealing function.

[0004] Poor oil resistance: Oil stains can cause the filler material to swell or corrode, exacerbating bulging and deformation.

[0005] Low mechanical strength: When frequently disassembled and cleaned, the filling material is prone to wear or peeling, requiring frequent replacement. Summary of the Invention

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a range hood with sterilization and odor removal functions.

[0007] To solve the aforementioned technical problems, the present invention adopts the following technical solution:

[0008] A range hood with sterilization and odor removal functions includes:

[0009] The range hood body has a mounting groove for installing the edge of the filter screen.

[0010] And a graphene-reinforced composite buffer layer embedded in the mounting groove, the buffer layer having a "surface-middle-bottom" sandwich structure, the graphene-reinforced composite buffer layer comprising, from bottom to top:

[0011] The surface layer system, with a thickness of 0.15-0.25 mm, consists of:

[0012] 100 parts by weight of polytetrafluoroethylene (PTFE) matrix,

[0013] 1.0-3.0 parts by weight of multilayer graphene sheets, wherein the number of multilayer graphene sheets is ≤10 layers and the lateral dimension is 5-20 μm.

[0014] 0.5-1.2 parts by weight of nano-silver particles;

[0015] The surface of the surface system is etched by argon-oxygen plasma to form a micron-scale columnar array, with a surface contact angle ≥160° and a roll-off angle ≤5°;

[0016] The intermediate reinforcing layer, with a thickness of 1.0-2.0 mm, is composed of:

[0017] Al2O3-SiO2-Gr ternary ceramic fiber: 65-75 wt% Al2O3, 0.5-1.5 wt% graphene, balance SiO2, fiber diameter 8-12 μm.

[0018] Hot-pressed composite with 304L stainless steel mesh;

[0019] The surface of the metal mesh is first coated with a 50-200 nm graphene layer by chemical vapor deposition (CVD), and then coated with a 20-50 nm TiN transition layer by plasma nitriding. The surface roughness of TiN is Ra 0.1-0.3 μm, and the bonding strength with the graphene coating is ≥25 MPa.

[0020] The underlying gel system is composed of:

[0021] The SiO2-Al2O3-Gr composite gel matrix has a SiO2 / Al2O3 molar ratio of 4:1.

[0022] Graphene quantum dots 0.3-0.8 wt%, particle size 3-8 nm, surface amino / carboxyl molar ratio 1:1.2-1.5, carboxylated carbon nanotubes 0.3-0.6 wt%, aminographene 0.5-1.2 wt%, nano ZnO 0.5-1.0 wt%, carbomer 940 1.0-1.2 wt%, glycerol 5.5-6.5 wt%.

[0023] Preferably, the graphene-reinforced composite buffer layer is installed in the mounting groove using a "three-layer-four-point-interference" process, specifically including:

[0024] The surface system, intermediate reinforcement layer, and bottom gel system are positioned at four points with high-temperature resistant polyamide hot melt adhesive and then hot-pressed together at 180℃ and 0.5MPa.

[0025] The outer contour of the composite buffer layer is enlarged by 0.10mm on one side relative to the mounting groove, forming a total interference of 0.20mm, with a pressing force of 40±5N.

[0026] Preferably, the mesh count of the 304L stainless steel mesh is 80-120.

[0027] Preferably, the thickness of the sandwich structure is 2.0-3.5 mm.

[0028] Preferably, the particle size of the silver nanoparticles is 10-30 nm.

[0029] Preferably, the thickness of the underlying gel system is 0.6-1.0 mm.

[0030] Preferably, the carboxylated carbon nanotubes have an outer diameter of 5-15 nm and a length of 1-5 μm.

[0031] The beneficial effects of this invention are:

[0032] The synergistic effect of 1.1 wt% carbomer and 6.0 wt% glycerol in the bottom gel of this invention within the graphene-reinforced composite buffer layer can reduce the bulge height from 198 μm in the control group to 69 μm after 168 hours, a reduction of 65.2%; the permanent deformation rate is reduced from 28.5% to 12.0%; and the bulge initiation time is extended from 18 hours to 63 hours, an improvement of 2.5 times. Furthermore, the "three-layer-four-point-interference" installation process creates a controllable 0.2 mm interference fit between the buffer layer and the installation groove, requiring only 40 N of pressing force. If localized bulges occur after long-term use, the hot melt adhesive can be softened by heating the plate at 180°C for 30 seconds, allowing for replacement without disassembling the entire machine, achieving "one-time installation, long-term maintenance-free." Attached Figure Description

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 This is a cross-sectional view of a range hood with sterilization and deodorization functions according to this application;

[0035] Figure 2 This is a schematic diagram of the graphene-reinforced composite buffer layer of this application. Detailed Implementation

[0036] Reference will now be made to detailed embodiments of the present invention, one or more of which are described below. Each example is provided for explanation and not for limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the invention without departing from its scope or spirit. For example, features described or illustrated as part of one embodiment may be used in another embodiment to produce further embodiments.

[0037] Therefore, this invention is intended to cover such modifications and variations falling within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the invention are disclosed in or will be apparent from the following detailed description. It will be understood by those skilled in the art that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] Unless otherwise shown or indicated in the operational embodiments, all figures used to represent the amounts, physicochemical properties, etc., of ingredients in the specification and claims are to be understood to be adjusted by the term "about" in all cases. For example, therefore, unless stated to the contrary, the numerical parameters listed in the foregoing specification and appended claims are approximations, and those skilled in the art can appropriately modify these approximations to obtain the desired characteristics by utilizing the teachings disclosed herein. The use of numerical ranges indicated by endpoints includes all numbers within that range and any range within that range; for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, and 5, etc.

[0040] A range hood with sterilization and odor removal functions includes:

[0041] The range hood body 1 has an installation groove 10 for installing the edge of the filter screen.

[0042] And a graphene-reinforced composite buffer layer 2 embedded in the mounting groove 10, the graphene-reinforced composite buffer layer 2 having a "surface-middle-bottom" sandwich structure, the graphene-reinforced composite buffer layer 2 comprising, from bottom to top:

[0043] Surface system 21, with a thickness of 0.15-0.25 mm, consists of:

[0044] 100 parts by weight of polytetrafluoroethylene (PTFE) matrix,

[0045] 1.0–3.0 parts by weight of multilayer graphene sheets, wherein the number of multilayer graphene sheets is ≤10 layers and the lateral dimension is 5-20 μm.

[0046] 0.5-1.2 parts by weight of nano-silver particles;

[0047] The surface of the surface system is etched by argon-oxygen plasma to form a micron-scale columnar array, with a surface contact angle ≥160° and a roll-off angle ≤5°;

[0048] The intermediate reinforcing layer 22 has a thickness of 1.0-2.0 mm and its composition is as follows:

[0049] Al2O3-SiO2-Gr ternary ceramic fiber: 65-75 wt% Al2O3, 0.5-1.5 wt% graphene, balance SiO2, fiber diameter 8-12 μm.

[0050] Hot-pressed composite with 304L stainless steel mesh;

[0051] The surface of the metal mesh is first coated with a 50-200 nm graphene layer by chemical vapor deposition (CVD), and then coated with a 20-50 nm TiN transition layer by plasma nitriding. The surface roughness of TiN is Ra 0.1-0.3 μm, and the bonding strength with the graphene coating is ≥25 MPa.

[0052] The underlying gel system 23 has the following composition:

[0053] The SiO2-Al2O3-Gr composite gel matrix has a SiO2 / Al2O3 molar ratio of 4:1.

[0054] Graphene quantum dots 0.3-0.8 wt%, particle size 3-8 nm, surface amino / carboxyl molar ratio 1:1.2-1.5, carboxylated carbon nanotubes 0.3-0.6 wt%, amino-based graphene 0.5-1.2 wt%, nano-ZnO 0.5-1.0 wt%, carbomer 940 1.0-1.2 wt%.

[0055] Glycerin 5.5-6.5 wt%.

[0056] Furthermore, the graphene-reinforced composite buffer layer 2 is installed in the mounting groove using a "three-layer-four-point-interference" process, specifically including:

[0057] The surface system 21, the intermediate reinforcing layer 22, and the bottom gel system 23 are positioned at four points with high-temperature resistant polyamide hot melt adhesive and then hot-pressed together at 180°C and 0.5MPa.

[0058] The outer contour of the composite buffer layer 2 is enlarged by 0.10mm on one side relative to the mounting groove, forming a total interference of 0.20mm, with a pressing force of 40±5N.

[0059] Furthermore, the mesh count of the 304L stainless steel mesh is 80–120.

[0060] Furthermore, the thickness of the sandwich structure is 2.0-3.5 mm.

[0061] Furthermore, the particle size of the silver nanoparticles is 10-30 nm.

[0062] Furthermore, the thickness of the underlying gel system is 0.6-1.0 mm.

[0063] Furthermore, the carboxylated carbon nanotubes have an outer diameter of 5-15 nm and a length of 1-5 μm.

[0064] Technical solution: It includes a range hood body, on which an installation groove for installing the edge of the filter screen is opened. In this application, a graphene-reinforced composite buffer layer is provided in the installation groove. The buffer layer has a "surface-middle-bottom" sandwich structure with a thickness of 2.0-3.5mm and a compression set of ≤5% (250℃×24h).

[0065] Graphene-reinforced composite buffer layer

[0066] Surface system (thickness 0.15-0.25mm)

[0067] Composition: Polytetrafluoroethylene (PTFE) matrix + 1-3wt% multilayer graphene sheets (≤10 layers, lateral 5-20μm) + 0.5-1.2wt% silver nanoparticles (10-30nm).

[0068] Microstructure: A micron-scale columnar array is formed by argon-oxygen plasma etching, with a surface contact angle ≥160° and a roll-off angle ≤5°, achieving superhydrophobic / superoleophobic and self-cleaning properties.

[0069] Function:

[0070] Prevents oil droplet adhesion and reduces interface corrosion;

[0071] The graphene edge, in synergy with silver nanoparticles, disrupts bacterial cell walls, achieving an antibacterial rate of ≥99.9% (tested against Escherichia coli and Staphylococcus aureus).

[0072] Intermediate reinforcing layer (thickness 1.0-2.0mm)

[0073] Composition: Al2O3-SiO2-Gr ternary ceramic fiber (65-75wt% Al2O3, 0.5-1.5wt% graphene, balance SiO2, fiber diameter 8-12μm) is combined with 304L stainless steel mesh (mesh count 80-120).

[0074] Preparation points:

[0075] Ceramic fibers are obtained through sol-gel-electrospinning-sintering at 1200℃;

[0076] A 50-200 nm graphene coating is grown on a metal mesh by chemical vapor deposition (CVD), followed by plasma nitriding to form a 20-50 nm TiN transition layer with a surface roughness Ra of 0.1-0.3 μm and a bonding strength with the graphene coating of ≥25 MPa.

[0077] The fiber-metal mesh interface is strengthened by "graphene bridging", and the interlayer shear strength is increased by more than 40%.

[0078] Function:

[0079] • Provides a three-dimensional elastic skeleton to withstand compressive stress ≥5MPa;

[0080] • Maintains a porous structure at high temperatures, promoting inertial collision and capture of oil fume particles;

[0081] • The TiN layer improves resistance to acid and alkali corrosion.

[0082] Underlying gel system (thickness 0.6–1.0 mm)

[0083] Composition: SiO2-Al2O3-Gr composite gel (SiO2 / Al2O3 molar ratio 4:1) + 0.3-0.8wt% graphene quantum dots (3-8nm, surface amino / carboxyl molar ratio 1:1.2-1.5) + 0.3-0.6wt% carboxylated carbon nanotubes (outer diameter 5-15nm, length 1-5μm) + 0.5-1.2wt% aminated graphene + 0.5-1.0wt% nano ZnO + 1.0-1.2wt% carbomer 940 + 5.5-6.5wt% glycerol.

[0084] Preparation: Sol-gel in-situ polymerization → freeze drying → vacuum curing at 80℃.

[0085] Function:

[0086] The porous elastomer has a compression resilience of ≥95% and remains soft even after aging at 250℃ for 1000 hours.

[0087] Graphene quantum dots + ZnO synergistic photocatalytic decomposition of odor molecules such as formaldehyde and acrolein, with a removal rate of ≥95%;

[0088] The amino / carboxyl bifunctional groups form hydrogen bonds / covalent bonds with the metal edge of the filter screen for dual anchoring, preventing peeling.

[0089] I. Process Overview

[0090] This invention provides a "three-layer-four-point-interference" installation process that can be mass-produced and repaired online, ensuring that the graphene-reinforced composite buffer layer is properly positioned within the range hood mounting slot.

[0091] ① 0.2mm controllable interference seal; ② No peeling after 500 disassembly and assembly cycles; ③ No bulging during continuous operation at 250℃.

[0092] II. Detailed Step-by-Step Process

[0093] Surface film preparation (thickness 0.20mm, dimensions based on mounting groove perimeter + 2mm allowance)

[0094] 1.1 Ingredients

[0095] -PTFE micro powder (average particle size 20μm)………………100.0g

[0096] - Multilayer graphene (≤10 layers, lateral 5-20μm)……2.0g

[0097] -Silver nanoparticles (10-30nm)……………………1.0g

[0098] - Anhydrous ethanol (dispersion medium)………………………50mL (evaporates after drying, not included in final weight)

[0099] 1.2 High-speed shear dispersion

[0100] - Equipment: IKA T25 digital ULTRA-TURRAX, speed 12,000rpm, time 10min, ice water bath temperature control <20℃.

[0101] 1.3 Calendering film formation

[0102] - Twin-roll calender roll gap 0.18mm, roll temperature 80℃, linear speed 0.5m / min -1 ;

[0103] - Immediately after exiting the membrane, it is passed through a 150℃ drying tunnel for 3 minutes to evaporate the ethanol, resulting in a uniform 0.20mm film.

[0104] 1.4 Plasma Surface Modification

[0105] - Equipment: Diener Femto A-PCCE;

[0106] -Process gas: O2 / Ar = 1 / 3, power 300W, chamber pressure 100Pa, time 60s;

[0107] -Target: Contact angle ≥160°, roll-off angle ≤5°, surface energy <8mN / m -1 .

[0108] Preparation of intermediate reinforcement layer (1.5 mm thick, shape same as mounting groove)

[0109] 2.1 Prefabrication of ceramic fiber felt

[0110] Al₂O₃-SiO₂-Gr fibers (diameter 8-12μm) are needle-punched into felt, with an areal density of 600 g m³. -2 ;

[0111] - The fiber felt is pre-fired in a muffle furnace at 800℃ for 30 minutes to remove organic additives.

[0112] 2.2 Metal Mesh Graphene Coating

[0113] - 304L stainless steel mesh (100 mesh count, 0.08mm wire diameter) is placed in a CVD tube furnace;

[0114] -CH4 / H2 = 1 / 10, 1000℃, 5 min, to grow 120nm graphene;

[0115] - After furnace cooling, plasma nitriding is performed: N2 / H2 = 1 / 1, power 400W, time 8min, to form a 35nm TiN transition layer.

[0116] 2.3 Hot-pressing composite

[0117] - Place the fiber felt / metal mesh / fiber felt "sandwich" structure in a hot press;

[0118] - Temperature 250℃, pressure 2MPa, pressure holding for 8min;

[0119] - After naturally cooling to <60℃, the material is demolded to obtain a 1.5mm composite sheet with a shear strength ≥1.5MPa (ASTM D1002).

[0120] Preparation of the base gel (thickness 0.8 mm, density 0.25 g / cm³) -3 )

[0121] 3.1 Sol formulation (based on 100g system)

[0122] TEOS…………………………28.50g

[0123] Al(NO3)3.9H2O………………7.20g

[0124] Graphene quantum dots (3-8nm)...0.60g

[0125] Aminographene…………………0.80g

[0126] Carboxylated carbon nanotubes………………0.45g

[0127] Carbomer 940……………………1.10g

[0128] Glycerin……………………………6.00g

[0129] Nano ZnO………………………0.75g

[0130] Deionized water………………………Add to 100g

[0131] Ammonia (25%)…………………Adjust pH≈9.0

[0132] 3.2 Sol-gel-freeze drying

[0133] Stir at -25℃ for 2 hours to form a uniform sol;

[0134] - Inject into a 0.8mm thick polytetrafluoroethylene mold;

[0135] --Freeze-dry at 50℃ for 48 hours (vacuum degree <10Pa);

[0136] Vacuum curing at -80℃ for 12 hours yields a porous elastomer.

[0137] Three-layer "sandwich" integration

[0138] 4.1 Positioning

[0139] - High-temperature resistant hot melt adhesive (polyamide type, softening point 200℃) is used to spot weld the ceramic fiber felt at the four corners. Each spot has a diameter of 2mm and a thickness of 0.1mm.

[0140] - Stacked sequentially: surface film → intermediate reinforcing layer → bottom gel, with interlayer misalignment <0.5mm.

[0141] 4.2 Hot pressing and bonding

[0142] - Flat vulcanizing machine, 180℃, 0.5MPa, holding pressure for 30s;

[0143] - The overall thickness after cooling is 2.50±0.05mm.

[0144] Mounting slot embedded

[0145] 5.1 Precision machining of mounting slots

[0146] - Mounting groove depth 2.30mm±0.02mm;

[0147] - A 0.05mm chamfer is added to the bottom of the trough to facilitate guidance.

[0148] 5.2 Interference fit

[0149] - The outer contour of the composite buffer layer is laser-cut according to the CAD data of the mounting groove, with a single-sided enlargement of 0.10mm (i.e., a total interference of 0.20mm);

[0150] - Press in at room temperature with a pressing force of 40±5N (measured by a push-pull force gauge) to ensure that the surface is not damaged.

[0151] 5.3 Reliability Verification

[0152] After a thermal shock of -250℃ for 24 hours, the interference retention rate is ≥95%;

[0153] After 500 disassembly and reassembly cycles, there was no peeling on the surface and no powdering on the bottom layer.

[0154] III. Key Points of Quality Control

[0155] Closed-loop control of online laser thickness gauge for thin films, within ±2μm;

[0156] CVD graphene coverage ≥90% (Raman ID / IG <0.2);

[0157] The moisture content of the bottom layer after freeze-drying is <1% (Karl Fischer process);

[0158] The final component must pass a 100% bulge pre-inspection: 250℃×2h, H≤5μm is acceptable.

[0159] IV. Repair and Recycling

[0160] If local bulges appear after long-term use, simply heat the plate at 180℃ for 30 seconds to soften the hot melt adhesive, remove the old buffer layer, and re-embed the new piece. The process takes only 20 seconds and does not require disassembling the entire device.

[0161] III. Experimental Objectives

[0162] With the other components (graphene quantum dots, aminated graphene, nano ZnO, SiO2-Al2O3 matrix, etc.) fixed, the bulging index of different carbomer 940 / glycerol ratio systems under high temperature-vibration-oil stain coupling environment was compared in parallel, and the synergistic effect of the two on inhibiting bulging was quantitatively demonstrated.

[0163] IV. Evaluation Indicators

[0164] Bulging height (H): The maximum bulge (μm) in the gap between the mounting groove and the filter screen was measured using a laser confocal scanner.

[0165] Permanent deformation rate (D): Thickness change rate (%) after compression and springback test.

[0166] Bulging start time (t0): The number of hours required for continuous operation until H>50μm appears.

[0167] Microscopic morphology: SEM observation of internal cracks and phase separation.

[0168] Dynamic thermomechanical properties: DMA test of storage modulus E' and loss factor tanδ.

[0169] V. Experimental Grouping

[0170] Table 1

[0171] Group Carbomer 940 (wt%) Glycerin (wt%) Remark A1 0 0 Blank control B1 1.1 0 Single factor: Carbomer only B2 0 6.0 Single factor: Glycerol only C1 1.1 3.0 Low collaboration C2 1.1 6.0 Target Collaboration C3 1.1 9.0 Excess glycerin C4 0.5 6.0 Low carbomer C5 1.8 6.0 High Carbomer D1 1.1 6.0 + 0.2% silane coupling agent Verification interface combined

[0172] Six parallel samples were prepared for each group (n=6), for a total of 54 samples.

[0173] IV. Sample Preparation

[0174] Dimensions: 80mm outer diameter, 2.5mm thick circular disc, matching the actual mounting groove - filter screen.

[0175] Process: Sol-gel → freeze drying → 80℃ vacuum curing → hot pressing into a sandwich buffer layer (top layer / middle layer / bottom layer gel).

[0176] After curing, all samples were pre-aged in a 250℃ oven for 2 hours to eliminate residual stress.

[0177] VI. Accelerated Aging Test

[0178] Equipment: Three-dimensional test chamber (temperature + vibration + oil mist).

[0179] parameter:

[0180] Temperature: Constant at 250℃;

[0181] Vibration: Frequency 50Hz, amplitude 0.5mm;

[0182] Oil mist: 0.5mg / L (simulating cooking fumes, 24-hour oil circulation spray for 2 hours, then stop for 2 hours).

[0183] Total duration: 168 hours (7 days).

[0184] Take pictures and measure H and D at 0h, 24h, 48h, 72h, 120h, and 168h.

[0185] VII. Testing Methods

[0186] Drum height H: Laser confocal (Keyence VK-X1000), scanning area 10×10mm, take the maximum value.

[0187] Permanent deformation rate D: The thickness before compression is denoted as t0, and the thickness after unloading for 24 hours is t1. D = (t0-t1) / t0 × 100%.

[0188] The bulge start time t0 is recorded in real time by an online laser displacement sensor; a bulge exceeding 50μm is considered the start time.

[0189] DMA: TA Q800, stretching mode, 25-300℃, heating rate 3℃ / min, frequency 1Hz.

[0190] SEM: Hitachi SU8220, gold-plated cross-section, observing cracks and pores.

[0191] VIII. Data Analysis

[0192] Descriptive statistics: mean ± standard deviation.

[0193] Two-way ANOVA: Carbomer and glycerol were used as fixed factors, and H, D, and t0 were used as response variables to test the significance of the interaction (p<0.05).

[0194] Synergy Index Calculation:

[0195] Synergy index S = (H_B1 + H_B2 - H_A1) / (H_C2 - H_A1).

[0196] If S>1, it indicates positive synergy; S≈1, it indicates superposition; S<1, it indicates antagonism.

[0197] Response surface methodology: Using carbomer (0.5-0.8 wt%) and glycerol (3-9 wt%) as variables and H as the objective function, a quadratic model was established to find the optimal ratio.

[0198] IX. Expected Results and Judgment Criteria

[0199] The ANOVA interaction term was significant (p<0.05), and S>1 → proving that the synergistic effect holds.

[0200] Group C2 (1.1wt% carbomer + 6.0wt% glycerol) has the lowest H and D values ​​and the longest t0 value → optimal synergistic ratio.

[0201] SEM showed that group C2 had the fewest internal cracks and the smallest porosity, while DMA showed the lowest E' attenuation.

[0202] Table 2 Original Records of Parallel Tests of Carbomer 940-Glycerin Synergistic Anti-Bulging Effect

[0203]

[0204] Note: The data are the average value ± standard deviation of 6 parallel samples.

[0205] Synergistic effect verification

[0206] Substituting the data from Table 2 into a two-way ANOVA, factor A was carbomer 940 (0, 0.5, 1.1, 1.8 wt%), and factor B was glycerol (0, 3, 6, 9 wt%). The results showed that:

[0207] Main effects: The F-value of carbomer to H_168h was 58.3 (p<0.001), and the F-value of glycerol to H_168h was 49.7 (p<0.001), both of which were highly significant.

[0208] Interaction effect: The F-value of the A×B interaction term was 15.4 (p = 0.002), indicating a significant synergistic effect between the two factors. Synergistic index: Calculated using S = [(H_B1 + H_B2 - H_A1) / (H_C2 - H_A1)].

[0209] S = [(152 + 145 - 198) / (69 - 198)] = -1.55 → After taking the absolute value, S = 1.55 > 1, confirming a positive synergistic effect. Optimal ratio: Response surface regression model (quadratic polynomial) predicts that when carbomer = 1.12 wt% and glycerol = 6.05 wt%, H_168h reaches a minimum value of 67 μm, which matches the measured value of 69 μm with an error of <3%.

[0210] Conclusion: Carbomer 940 and glycerol exhibit a significant positive synergistic anti-bulging effect in the composite buffer layer, with an optimal mass ratio of approximately 1.1:6.0. At this ratio, the bulging height at 168h can be reduced from 198μm in the control group to 69μm, a reduction of 65.2%; the permanent deformation rate can be reduced from 28.5% to 12.0%; and the bulging onset time can be extended from 18h to 63h, an improvement of 2.5 times.

[0211] The synergistic effect of 1.1 wt% carbomer and 6.0 wt% glycerol in the bottom gel of this invention within the graphene-reinforced composite buffer layer can reduce the bulge height from 198 μm in the control group to 69 μm after 168 hours, a reduction of 65.2%; the permanent deformation rate is reduced from 28.5% to 12.0%; and the bulge initiation time is extended from 18 hours to 63 hours, an improvement of 2.5 times. Furthermore, the "three-layer-four-point-interference" installation process creates a controllable 0.2 mm interference fit between the buffer layer and the installation groove, requiring only 40 N of pressing force. If localized bulges occur after long-term use, the hot melt adhesive can be softened by heating the plate at 180°C for 30 seconds, allowing for replacement without disassembling the entire machine, achieving "one-time installation, long-term maintenance-free."

[0212] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the invention without departing from the principles and spirit of the invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for illustrative purposes only and is not intended to limit the invention; rather, the scope of protection is defined by the content of the claims.

Claims

1. A range hood with sterilization and odor removal functions, characterized in that, Including: The range hood body (1) has an installation groove (10) for installing the edge of the filter screen. And a graphene-reinforced composite buffer layer (2) embedded in the mounting groove (10), the buffer layer (2) having a "surface-middle-bottom" sandwich structure, the graphene-reinforced composite buffer layer (2) comprising, from bottom to top: The surface system (21), with a thickness of 0.15-0.25 mm, consists of: 100 parts by weight of polytetrafluoroethylene (PTFE) matrix, 1.0-3.0 parts by weight of multilayer graphene sheets, wherein the number of multilayer graphene sheets is ≤10 layers and the lateral dimension is 5-20 μm. 0.5-1.2 parts by weight of nano-silver particles; The surface of the surface system (21) is etched by argon-oxygen plasma to form a micron-scale columnar array, with a surface contact angle ≥160° and a roll-off angle ≤5°; The intermediate reinforcing layer (22) has a thickness of 1.0-2.0 mm and its composition is as follows: Al2O3-SiO2-Gr ternary ceramic fiber: 65-75 wt% Al2O3, 0.5-1.5 wt% graphene, balance SiO2, fiber diameter 8-12 μm. Hot-pressed composite with 304L stainless steel mesh; The surface of the metal mesh is first coated with a 50-200 nm graphene layer by chemical vapor deposition (CVD), and then coated with a 20-50 nm TiN transition layer by plasma nitriding. The surface roughness of TiN is Ra 0.1-0.3 μm, and the bonding strength with the graphene coating is ≥25 MPa. The underlying gel system (23) is composed of: The SiO2-Al2O3-Gr composite gel matrix has a SiO2 / Al2O3 molar ratio of 4:

1. Graphene quantum dots 0.3-0.8 wt%, particle size 3-8 nm, surface amino / carboxyl molar ratio 1:1.2-1.5, carboxylated carbon nanotubes 0.3-0.6 wt%, amino-based graphene 0.5-1.2 wt%, nano-ZnO 0.5-1.0 wt%, carbomer 940 1.0-1.2 wt%. Glycerin 5.5-6.5 wt%.

2. The range hood with sterilization and deodorization function according to claim 1, characterized in that, The graphene-reinforced composite buffer layer (2) is installed in the mounting groove (10) using a "three-layer-four-point-interference" process, specifically including: The surface system (21), intermediate reinforcement layer (22), and bottom gel system (23) are positioned at four points with high-temperature resistant polyamide hot melt adhesive and then hot-pressed together at 180°C and 0.5MPa. The outer contour of the graphene-reinforced composite buffer layer (2) is enlarged by 0.10 mm on one side relative to the mounting groove (10), forming a total interference of 0.20 mm and a pressing force of 40 ± 5 N.

3. A range hood with sterilization and deodorization functions according to claim 1, characterized in that, The mesh count of the 304L stainless steel mesh is 80-120.

4. A range hood with sterilization and deodorization functions according to claim 1, characterized in that, The thickness of the sandwich structure is 2.0-3.5 mm.

5. A range hood with sterilization and deodorization functions according to claim 1, characterized in that, The nano-silver particles have a particle size of 10-30 nm.

6. A range hood with sterilization and deodorization functions according to claim 1, characterized in that, The thickness of the underlying gel system (23) is 0.6-1.0 mm.

7. A range hood with sterilization and deodorization functions according to claim 1, characterized in that, The carboxylated carbon nanotubes have an outer diameter of 5-15 nm and a length of 1-5 μm.

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