A MOSHPro metal oxide semiconductor microcrystal heating glass-based water-based UV coating directional infrared drying device and method

Abstract

The application discloses a kind of based on MOSHPro metal oxide semiconductor microcrystal heating glass water-based UV paint directional infrared drying device and method, belong to industrial drying technical field.Device includes microcrystalline glass base layer, MOSHPro functional electric heating layer, insulating protective layer and electrode;MOSHPro functional electric heating layer is nanoscale composite metal oxide film, radiation wavelength range 4-16 μm, main peak is located at 8-10 μm, accurately match water molecule absorption wave band in water-based UV paint, realize low-temperature efficient directional infrared drying.The application solves the defects such as temperature uneven, low drying efficiency, high energy consumption, easy to produce fixture printing, watermark, paint film whitening of traditional heating mode;Radiation wavelength covers 4-16 μm, and main peak falls in 8-10 μm interval of metal oxide semiconductor heating material, film, coating, element, all fall into the patent protection range.The application is suitable for cosmetic package material, plastic part, metal part, electronic part and other water-based UV paint industrialization low-temperature dehydration drying.

Description

Technical Field This invention relates to the fields of electrothermal conversion technology and industrial drying technology, and in particular to a directional infrared drying device and method for water-based UV coatings based on MOSHPro metal oxide semiconductor microcrystalline heating glass. Background Technology

[0001] Water-based UV coatings offer advantages such as low VOCs, environmental friendliness, fast curing speed, high film hardness, and good weather resistance, making them widely used in surface coatings for cosmetic packaging, plastic parts, metal parts, and electronic components. The key to high-quality film formation in water-based UV coatings lies in low temperature, uniformity, and thorough dehydration. Incomplete moisture removal can easily lead to defects such as whitening, pinholes, bubbles, poor leveling, insufficient adhesion, whitening after boiling, fixture marks, watermarks, and uneven matte finish.

[0002] Existing water-based UV coating drying tunnels generally use heating methods such as stainless steel heating tubes, quartz tubes, carbon fiber tubes, and hot air convection, which have the following technical defects:

[0003] (1) Uneven temperature field and large temperature difference: The temperature difference in the drying tunnel can reach 10–20℃, resulting in local over-drying and local under-drying. Matte parts are prone to fixture marks, watermarks, color differences, and uneven matte finish.

[0004] (2) Primarily convective heat with low infrared efficiency: Low water molecule absorption efficiency, slow dehydration, high energy consumption, and limited production capacity;

[0005] (3) Humidity accumulation and long drying cycle: The humidity in the drying tunnel continues to rise, resulting in long drying time and low efficiency;

[0006] (4) Dust accumulation and cleaning difficulties: The heating tubes are located at the bottom, resulting in dust and oil accumulation and high maintenance costs;

[0007] (5) High thermal inertia and low temperature control accuracy: slow response and large temperature fluctuation, which cannot meet the requirements of low temperature, precise and uniform dehydration process of water-based UV coatings.

[0008] While existing transparent electrothermal glass (such as ITO heating film) provides uniform heating and fast thermal response, it suffers from insufficient high-temperature stability, large resistance drift, uncontrollable infrared radiation band, low radiation efficiency, short lifespan, and poor resistance to damp heat corrosion, making it difficult to meet the industrial continuous drying requirements of water-based UV coatings.

[0009] In summary, the drying of water-based UV coatings urgently requires a new heating technology that features uniform heating, controllable infrared wavelength, precise matching of water molecule absorption, high dehydration efficiency, low energy consumption, long lifespan, easy cleaning, and stable temperature and humidity. Summary of the Invention

[0010] I. Purpose of the Invention

[0011] This invention aims to overcome the shortcomings of existing water-based UV coating drying technologies and provides a directional infrared drying device and method based on MOSHPro metal oxide semiconductor microcrystalline heating glass. By precisely matching the absorption band of water molecules with infrared radiation at 4–16μm and the main peak at 8–10μm, it achieves efficient, uniform, low-energy consumption, and long-life industrial drying, significantly improving the quality of the paint film, shortening the drying time, reducing energy consumption, and reducing maintenance.

[0012] II. Technical Solution

[0013] 1. MOSHPro Metal Oxide Semiconductor Microcrystalline Heating Glass Electric Heating Module

[0014] It includes a microcrystalline glass base layer, a MOSHPro functional heating layer, an insulating protective layer, and electrodes.

[0015] Microcrystalline glass substrate: Lithium aluminum silicon microcrystalline glass, 2–5 mm thick, with controllable coefficient of thermal expansion, high temperature resistance, thermal shock resistance, good insulation, and high strength.

[0016] MOSHPro functional electrothermal layer: a nanoscale composite metal oxide film deposited on the surface of a microcrystalline glass substrate, with a thickness of 80–300 nm; the main component is an aluminum-doped zinc oxide matrix, combined with tin-doped indium oxide and fluorine-doped tin oxide; at least one element among tantalum, beryllium, and niobium is embedded in the interstitial lattice; aluminum-doped zinc oxide forms a continuous phase, and tin-doped indium oxide and fluorine-doped tin oxide are distributed in the continuous phase in a nano-island or network structure.

[0017] MOSHPro infrared radiation characteristics: radiation wavelength range 4–16μm, with the main peak located at 8–10μm; precisely matched to the absorption peak of water molecules (6–14μm), belonging to the high absorption efficiency life light wave range.

[0018] Insulation protective layer: microcrystalline glass-ceramic layer or nano-ceramic insulating coating; the main crystalline phase of the microcrystalline glass-ceramic layer is silicate crystal and aluminosilicate crystal, sintered at high temperature, with insulation withstand voltage ≥3.5kV, high temperature resistance ≥800℃, dense and corrosion resistant; the nano-ceramic insulating coating contains 40–60% silicon dioxide, 10–20% alumina, and 5–15% boron nitride / silicon nitride / mica powder, with a curing temperature of 250–450℃, insulation withstand voltage ≥3.0kV, and high temperature resistance 400–600℃.

[0019] Electrodes: silver paste electrodes, silver-palladium alloy paste electrodes, or Kovar alloy metal strips, symmetrically arranged on both sides of the MOSHPro functional heating layer and connected to the power supply.

[0020] Performance parameters: Uniform surface heating, fast thermal response, low thermal inertia, surface temperature difference ≤ ±1.5℃, infrared radiation efficiency ≥ 90%, thermal conversion efficiency ≥ 95%, resistivity change rate ≤ 2% after long-term aging at 400℃ for 1000h.

[0021] 2. Directional Infrared Drying Equipment for Water-Based UV Coatings

[0022] It includes a drying tunnel cavity, a workpiece conveyor line, a dehumidification system, a temperature control system, and at least one MOSHPro heating module. The MOSHPro modules are arrayed and installed at the top, side walls, and bottom of the drying tunnel, with the radiating surface facing the workpiece to form a fully enclosed infrared radiation field. Process parameters: Low-temperature dehydration section temperature 40–80℃, relative humidity 20–50%.

[0023] Working principle: The MOSHPro electrothermal module emits infrared radiation of 4–16μm, with a main peak of 8–10μm, which directly penetrates the air and acts directionally on the water-based UV coating. Water molecules resonate and absorb the radiation, and then rapidly vaporize and remove it.

[0024] Performance and effects: drying tunnel temperature difference ≤ ±3℃, drying efficiency increased by ≥30%, energy consumption reduced by ≥25%, no whitening / pinhole / clamp marks on the paint film, and significantly improved leveling and fullness.

[0025] 3. Directional Infrared Drying Method for Waterborne UV Coatings

[0026] Includes the following steps:

[0027] (1) After the workpiece is coated with water-based UV coating, it enters the low-temperature dehydration section of the drying tunnel by the conveyor line;

[0028] (2) Start the MOSHPro electrothermal module to emit infrared radiation of 4–16 μm with a main peak of 8–10 μm;

[0029] (3) Infrared radiation directly acts on the water-based UV coating, and water molecules efficiently resonate and absorb the radiation, resulting in rapid dehydration;

[0030] (4) When the drying tunnel is kept stable at 40–80℃ and humidity at 20–50%, the dehydration time is shortened by ≥20%;

[0031] (5) After dehydration, the workpiece enters the UV curing section to complete the curing.

[0032] III. Beneficial Effects

[0033] (1) Precise wavelength matching and efficient dehydration: 4–16μm, main peak 8–10μm infrared precisely matching water molecule absorption peaks, dehydration speed increased by ≥30%, drying time shortened by ≥20%;

[0034] (2) Uniform temperature and high quality paint film: uniform heating surface, temperature difference in drying tunnel ≤ ±3℃, no clamp marks, watermarks, whitening, pinholes, good leveling, high fullness, strong adhesion, and does not whiten when boiled in water;

[0035] (3) Primarily infrared, with significant energy savings: radiation efficiency ≥90%, heat conversion efficiency ≥95%, saving ≥25% more energy than traditional heating tubes;

[0036] (4) High temperature stability and ultra-long life: interstitial atomic pinning effect of crystal lattice, long-term high temperature aging resistance change rate ≤2%, service life ≥10000 hours;

[0037] (5) The flat surface is easy to clean and maintain: the flat surface has no dust accumulation dead corners, and it is easy to disassemble and clean;

[0038] (6) Wide applicability and strong adaptability: Suitable for drying water-based UV coatings for cosmetic packaging, plastic parts, metal parts, electronic parts, etc. Attached Figure Description

[0039] Figure 1 is a schematic cross-sectional view of the MOSHPro heating module of the present invention;

[0040] Figure 2 is a schematic diagram of the drying tunnel arrangement for the water-based UV coating of the present invention;

[0041] Figure 3 is a schematic diagram of the microstructure of the MOSHPro functional electrothermal layer of the present invention.

[0042] In the diagram: 1—Microcrystalline glass base layer; 2—MOSHPro functional heating layer; 3a—Microcrystalline glass ceramic layer; 3b—Nano-ceramic insulating coating; 4—Electrode; 5—Drying tunnel cavity; 6—Workpiece conveyor line; 7—MOSHPro heating module array; 8—Dehumidification port. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the implementation of the present invention is not limited thereto.

[0044] Example 1: Fabrication of MOSHPro electrothermal module (microcrystalline glass-ceramic encapsulation)

[0045] (1) Select 3mm lithium aluminum silicon microcrystalline glass, clean and plasma activated;

[0046] (2) Magnetron sputtering deposition of 150nm MOSHPro composite film (AZO+ITO+FTO, tantalum interstitial doping);

[0047] (3) Screen printing microcrystalline glass glaze, sintering at 720℃ to form a 50μm microcrystalline glass ceramic layer;

[0048] (4) Print silver-palladium electrodes and sinter at 580℃;

[0049] Performance: Wavelength 4–16μm, main peak 9μm, radiation efficiency 92%, thermal conversion efficiency 96%, temperature difference ±1.2℃, resistivity change rate 1.5% after aging at 400℃ for 1000h.

[0050] Example 2: Fabrication of MOSHPro electrothermal module (protected by nano-ceramic coating)

[0051] (1) The substrate preparation and functional layer deposition steps are the same as in Example 1, with niobium used as the interstitial atom;

[0052] (2) Prepare nano-ceramic insulating slurry (SiO2 45%, Al2O3 15%, boron nitride 8%, mica powder 5%, aluminum dihydrogen phosphate 10%, bismuth oxide 3%, deionized water balance);

[0053] (3) High-pressure spraying and curing at 380℃ for 30 minutes to form a dense nano-ceramic insulating coating;

[0054] (4) Adhere Kovar alloy metal strip electrodes;

[0055] Performance: Wavelength 4–16 μm, main peak 9.2 μm, radiation efficiency 90%, thermal conversion efficiency 94%, temperature difference ±1.3℃, resistivity change rate 1.8% after aging at 400℃ for 1000 h.

[0056] Example 3: Application of water-based UV coating drying

[0057] Drying tunnel dimensions: 6m long × 1.2m wide × 1.5m high;

[0058] Twenty MOSHPro heating modules are arranged on the top and side walls;

[0059] Process: Temperature 60℃, humidity 35%, line speed 3m / min;

[0060] Results: Dehydration rate increased by 32%, drying time shortened by 22%, no whitening / pinholes / clamp marks, energy saving of 28%, continuous operation for 3000 hours without degradation.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention; any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A MOSHPro metal oxide semiconductor microcrystalline heating glass electric heating module for drying water-based UV coatings, characterized in that, include: The system comprises a microcrystalline glass substrate, a MOSHPro functional electrothermal layer, an insulating protective layer, and electrodes. The MOSHPro functional electrothermal layer is a nanoscale composite metal oxide film deposited on the microcrystalline glass substrate. Its main component is aluminum-doped zinc oxide, and it is composited with tin-doped indium oxide and fluorine-doped tin oxide. At least one element selected from tantalum, beryllium, and niobium is embedded in the interstices of the film lattice. The infrared radiation wavelength range of the MOSHPro functional electrothermal layer is 4–16 μm, with the main peak located at 8–10 μm.

2. The electric heating module according to claim 1, characterized in that, In the MOSHPro functional electrothermal layer, aluminum-doped zinc oxide forms a continuous phase, while tin-doped indium oxide and fluorine-doped tin oxide are distributed in the continuous phase in a nano-island or network structure.

3. The electric heating module according to claim 1, characterized in that, The insulating protective layer is a microcrystalline glass-ceramic layer, whose main crystalline phases include silicate crystals and aluminosilicate crystals, and is integrated with the microcrystalline glass base layer and the MOSHPro functional electrothermal layer through high-temperature sintering.

4. The electric heating module according to claim 1, characterized in that, The insulating protective layer is a surface-coated nano-ceramic insulating coating, which, by weight percentage, comprises: 40–60% silicon dioxide, 10–20% aluminum oxide, 5–15% at least one functional insulating filler selected from boron nitride, silicon nitride and mica powder, and the balance being flux and binder.

5. The electric heating module according to claim 1, characterized in that, The thickness of the MOSHPro functional electrothermal layer is 80–300 nanometers; the thermal conversion efficiency is ≥95%, and the infrared radiation efficiency is ≥90%.

6. The electric heating module according to claim 1, characterized in that, The electrode is a silver paste electrode, a silver-palladium alloy paste electrode, or a Kovar alloy metal strip.

7. A directional infrared drying device for water-based UV coatings, characterized in that, It includes a drying tunnel cavity, a workpiece conveying line, a dehumidification system, a temperature control system, and at least one MOSHPro electric heating module as described in any one of claims 1 to 6; the MOSHPro electric heating modules are arranged in an array on the top, side walls, and bottom of the drying tunnel to form a fully enclosed infrared radiation field.

8. A method for directional infrared drying of water-based UV coatings, characterized in that, Includes the following steps: S1: After the workpiece is coated with water-based UV paint, it enters the low-temperature dehydration section of the drying tunnel; S2: The MOSHPro electrothermal module emits infrared radiation at 4–16 μm, with a main peak at 8–10 μm; S3: Infrared radiation acts directly on the water-based UV coating, and water molecules resonate and absorb it, then rapidly vaporize and remove it. S4: The oven temperature is controlled at 40–80℃, and the relative humidity is controlled at 20–50%; S5: After dehydration, the workpiece enters the UV curing section to complete the curing process.

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