Preparation process of germicidal lamp cover and application thereof

Abstract

The application relates to the technical field of spraying processes, in particular to a preparation process of a sterilization lampshade and application thereof. The preparation process of the sterilization lampshade comprises the following steps: a spraying process: photocatalyst coating is sprayed on a blister board, and photocatalyst blister boards are prepared through solidification; the solidification temperature is 50-80 DEG C; a blistering process: the photocatalyst blister boards are heated and softened, placed on a mold for blistering, and sterilization lampshades are prepared; the heating and softening temperature is 350-600 DEG C, and the heating and softening time is 15-35 s. The water-based coating spraying process and the blistering process are effectively combined, photocatalyst materials are combined with the blistering substrate, and the photocatalyst materials are formed into the lampshades, so that the production steps of spraying the photocatalyst first and then shaping are realized; meanwhile, the coating solidification temperature is regulated, the blistering temperature is regulated, and the heating and softening time is regulated, so that the lampshades have good appearance yield, and the antibacterial rate is kept above 99%.

Description

Technical Field

[0001] This invention relates to the field of spray coating technology, specifically to a preparation process and application of a germicidal lamp cover. Background Technology

[0002] Currently, commonly used air purification methods include physical adsorption, plasma technology, negative ion technology, and ultraviolet disinfection. However, these purification technologies have unavoidable drawbacks. Physical adsorption is currently the most widely used physical treatment technology, mainly removing pollutants through the strong adsorption capacity generated by the numerous tiny pores or voids in materials such as activated carbon and molecular sieves. Although this method is relatively simple, it requires regular replacement and poses a possibility of secondary pollution. Plasma technology has the advantage of effectively degrading and removing most polluting gases with excellent removal results. Its disadvantage is the generation of harmful gases during the purification process, such as O3, CO, and NO. X The plasma reaction process involves the production of harmful gases, requiring additional equipment to treat them. Furthermore, plasma reaction equipment is expensive and complex to operate. Negative ion air purification technology suffers from short lifespans. Devices based on ultraviolet disinfection technology pose a risk to human health and cannot be used in conjunction with human comfort.

[0003] Visible light photocatalysis technology for degrading air pollutants has advantages such as safety, non-toxicity, high catalytic activity, and low energy consumption, making it a promising technology for air pollution control. When lamplight or sunlight shines on the surface of a lampshade, the visible light photocatalytic material on the surface absorbs the light energy, exciting electrons into the conduction band, thus generating a large number of electrons and holes with strong reducing and oxidizing capabilities. Oxygen absorbed on the surface gains electrons to generate strongly reducing negative oxygen ions, while holes remove OH groups from the surface. - It reacts with H₂O to form a strong oxidizing hydroxyl radical (·OH). Active component O 2- ·OH has a high catalytic capacity, capable of decomposing pollutants such as bacteria, viruses, formaldehyde, and odor molecules into harmless CO2 and H2O. However, research on the manufacturing process of lampshades for disinfection and sterilization ceiling lights and fan lights remains very limited. Conventional photocatalytic powder coating processes involve first manufacturing the lampshade and other components, and then spraying the manufactured lampshade with photocatalytic powder; however, spraying each component individually is not conducive to mass production, and if the photocatalytic powder is sprayed first and then the lampshade is shaped, it is difficult to maintain the sterilization rate and the yield of the lampshade's appearance.

[0004] Therefore, there is an urgent need to propose a manufacturing process for germicidal lamp covers. The germicidal lamp covers produced by this process can maintain a good germicidal rate and lamp cover appearance, while also achieving photocatalyst spraying followed by shaping, thereby improving production efficiency. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, it provides a manufacturing process for a germicidal lampshade and its application. The germicidal lampshade manufactured by the manufacturing process of this invention can achieve a good appearance yield and maintain an antibacterial rate of over 99%, while also enabling the lampshade to undergo a production step of first spraying a photocatalyst and then shaping.

[0006] The inventive concept of this invention is to effectively combine water-based coating spraying process and vacuum forming process to combine photocatalyst material with vacuum forming substrate and form it into lampshade, realizing the production steps of first spraying photocatalyst and then shaping; at the same time, by controlling the coating curing temperature, spray pressure and spraying flow rate, and controlling the vacuum forming temperature, the lampshade has a good appearance yield and maintains an antibacterial rate of over 99%.

[0007] A first aspect of the present invention provides a process for preparing a germicidal lamp cover, the process comprising the following steps:

[0008] (1) Spraying process: Photocatalytic coating is sprayed onto the vacuum forming board and cured to obtain a photocatalytic vacuum forming board; the curing temperature is 50-80℃.

[0009] (2) Vacuum forming process: The photocatalytic vacuum forming board is heated and softened, placed on a mold and vacuum formed to obtain the germicidal lamp cover; the heating and softening temperature is 350-600℃ and the heating and softening time is 15-35s.

[0010] Compared with the prior art, the beneficial effects of the preparation process of the germicidal lampshade provided by the first aspect of the present invention are as follows: by effectively combining the water-based coating spraying process and the vacuum forming process, the photocatalyst material is combined with the vacuum forming plate and formed into a lampshade, realizing the production steps of first spraying the photocatalyst and then shaping; at the same time, by controlling the coating curing temperature, controlling the vacuum forming temperature, and controlling the heating softening time, the lampshade has a good appearance yield and maintains an antibacterial rate of over 99%. The resulting germicidal lampshade has a uniform coating, no powdering or paint peeling, and the appearance and size of the lampshade meet the standard requirements.

[0011] Preferably, the material of the thermoforming board includes at least one of styrene (PS), methyl methacrylate resin (PMMA), styrene-methyl methacrylate copolymer (MS), styrene-acrylate copolymer (NAS), polymethylpentene (TPX), allyl diethylene glycol carbonate (ADC), polysulfone (PSU), polytricyclodecyl methacrylate (model 0Z-1000, OZ-1011, OZ-1012 or OZ-1013), and cycloalkenyl polymer (COP).

[0012] Preferably, the vacuum-formed panel further includes a frosted surface, which is the surface on which the photocatalytic coating is sprayed.

[0013] Preferably, the photocatalytic coating includes a photocatalyst, which is a material with photocatalytic activity under ultraviolet light, visible light, or sunlight; preferably, the photocatalyst includes at least one of TiO2, ZnO, CeO2, Ta2O5, InVO4, MnO2, Bi2O3, g-C3N4 (graphitic carbon nitride) and their derivatives and complexes.

[0014] Preferably, the method for preparing the photocatalytic coating includes: mixing 1-10 parts by weight of photocatalyst, 70-90 parts by weight of sodium silicate, and 9-20 parts by weight of oxide curing agent, by ball milling, ultrasonic dispersion, or mechanical stirring for 1-2 hours. Preferably, the oxide curing agent includes tert-butyl peroxide.

[0015] Preferably, the spraying method includes compound low-mist mobile spraying.

[0016] Preferably, the spraying pressure is 1-10 MPa; more preferably, the spraying pressure is 2-6 MPa.

[0017] Preferably, the spraying flow rate is 0.5-5 L / h; more preferably, the spraying flow rate is 1-3 L / h.

[0018] Preferably, the curing is heat curing.

[0019] Preferably, the curing temperature is 60-70℃.

[0020] Preferably, the curing time is 3-15 minutes; more preferably, the curing time is 5-10 minutes.

[0021] Preferably, the temperature for heating and softening is 400-550°C.

[0022] Preferably, when the material of the thermoforming board is styrene, the heating and softening time is 20-26s; when the material of the thermoforming board is methyl methacrylate resin, the heating and softening time is 27-35s; and when the material of the thermoforming board is styrene-methyl methacrylate resin copolymer, the heating and softening time is 26-29s.

[0023] Preferably, the thickness of the thermoforming board is 1.5-2.5mm; more preferably, the thickness of the thermoforming board is 1.7-2.1mm.

[0024] Preferably, when the material of the vacuum forming board is styrene and the thickness of the vacuum forming board is greater than or equal to 1.7 mm and less than 1.9 mm, the heating and softening time is 20-23 s; when the material of the vacuum forming board is styrene and the thickness of the vacuum forming board is greater than or equal to 1.9 mm and less than 2.1 mm, the heating and softening time is 24-26 s.

[0025] Preferably, the preparation process includes the following steps:

[0026] (1) Spraying process:

[0027] (a) Spraying photocatalyst material: Add photocatalyst coating to the paint tank; turn on the power of the sprayer and adjust the spraying pressure and flow parameters; start the conveyor belt and place the blister board on the conveyor belt with the frosted surface facing up; start the sprayer and when the blister board is conveyed to the spray gun position, a layer of photocatalyst coating is sprayed onto the frosted surface of the blister board.

[0028] (b) Heating and curing: After the spraying is completed, the vacuum forming board is conveyed to the oven for curing. The curing temperature is 60-70℃ and the curing time is 5-10 minutes. After the spraying and curing are completed, the power switches of the heating oven, spraying machine and conveyor belt are turned off.

[0029] (2) Vacuum forming process:

[0030] (a) Start the mask machine setting program: check the mask machine for foreign objects and clean it; check whether each part of the mask machine is normal and adjust it; turn on the main power of the mask machine; after the equipment is normal, open the oven and set the heating and softening temperature and the heating and softening time in the oven according to the different materials of the blister board.

[0031] (b) Softening the blister pack in an oven: The blister pack is placed in an oven to soften;

[0032] (c) Place it above the mold and vacuum-form it to obtain a molded lampshade;

[0033] (d) Separate the molded lampshade and edge waste to obtain the germicidal lampshade.

[0034] A second aspect of the present invention provides a germicidal lampshade, which is prepared by the aforementioned manufacturing process.

[0035] Preferably, the germicidal lamp cover includes a photocatalytic layer, wherein when the photocatalytic layer of the germicidal lamp cover is irradiated by light or sunlight under conditions containing O2 or H2O, oxidizing substances are generated on the photocatalytic layer; preferably, the oxidizing substances include hydroxyl radicals (·OH), O2, etc. 2- .

[0036] A third aspect of the present invention provides an air purifier, the air purifier including the germicidal lampshade described above.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] (1) By effectively combining water-based coating spraying and vacuum forming processes, photocatalyst materials are bonded to a vacuum-formed substrate and molded into a lampshade, achieving a production step of first spraying the photocatalyst and then shaping it. By optimizing and adjusting important process parameters during water-based coating spraying, the uniformity of the coating and the efficiency of disinfection and sterilization can be flexibly adjusted; by adjusting the coating curing temperature, the adhesion of the photocatalyst coating on the vacuum-formed board surface can be controlled; by controlling the heating and softening temperature before vacuum forming, the adhesion of the coating on the surface of the photocatalyst disinfection and sterilization lampshade of different materials and the efficiency of disinfection and sterilization can be improved, avoiding the phenomenon of powdering and paint peeling. The lampshade achieves a good appearance yield, maintains an antibacterial rate of over 99%, and the resulting sterilization lampshade has a uniform coating, no powdering or paint peeling, and the appearance and dimensions of the lampshade meet the standard requirements.

[0039] (2) The spraying equipment is a special equipment used for spraying vacuum-formed panels. It adopts a reciprocating low-mist moving spraying method and can complete the flat spraying operation in one go. Attached Figure Description

[0040] Figure 1 This is a schematic flowchart of the germicidal lamp cover preparation process in Example 1. Detailed Implementation

[0041] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0042] Unless otherwise specified, the raw materials, reagents or devices used in the following examples are available from conventional commercial sources or can be obtained by existing known methods.

[0043] Examples 1-3

[0044] Germicidal Lamp Cover and its Manufacturing Process

[0045] The preparation process steps of Examples 1-3 are as follows:

[0046] (1) Spraying process:

[0047] (a) Spraying photocatalyst material: Add photocatalyst coating to the paint tank; turn on the power of the sprayer and adjust the spraying pressure and flow parameters. The spraying pressure and flow rate of each embodiment are shown in Table 1 below; start the conveyor belt and place the blister pack on the conveyor belt with the frosted side facing up; start the sprayer, and when the blister pack is conveyed to the spray gun position, a layer of photocatalyst coating is sprayed onto the frosted surface of the blister pack; the photocatalysts of each embodiment are shown in Table 1 below;

[0048] Preparation method of photocatalytic coating: 10 parts of TiO2 photocatalyst, 80 parts of sodium silicate (Aladdin reagent), and 10 parts of oxide curing agent are mixed by ball milling for 1.5 hours; the oxide curing agent is tert-butyl peroxide.

[0049] (b) Heating and curing: After the spraying is completed, the vacuum forming board is conveyed to the oven for curing. The curing temperature and curing time of each embodiment are shown in Table 1 below. After the spraying and curing are completed, the power switches of the heating oven, spraying machine and conveyor belt are turned off.

[0050] (2) Vacuum forming process:

[0051] (a) Start the mask machine setting program: check if there are any foreign objects in the mask machine and clean them; check if each part of the mask machine is normal and adjust it; turn on the main power of the mask machine; after the equipment is normal, turn on the oven and set the heating and softening temperature and heating and softening time in the oven according to the different materials of the blister board; the materials of the blister board, the heating and softening temperature, and the heating and softening time of each embodiment are shown in Table 1 below;

[0052] (b) The thermoformed sheet is placed in an oven to soften it: The thermoformed sheet is placed in an oven to soften it;

[0053] (c) Place it above the mold and vacuum-form it to obtain a molded lampshade;

[0054] (d) Separate the molded lampshade and edge waste to obtain a germicidal lampshade.

[0055] Figure 1 This is a schematic flowchart of the germicidal lamp cover preparation process in Example 1.

[0056] Table 1 Process parameters for Examples 1-3

[0057]

[0058] The germicidal lamp covers prepared in Examples 1-3 were evaluated for appearance and their antibacterial rate was tested. The antibacterial rate test reference standard was GB / T 30706 Test method and evaluation of photocatalytic antibacterial materials and products under visible light irradiation. The appearance evaluation and antibacterial rate results are shown in Table 2 below.

[0059] Table 2. Appearance evaluation and antibacterial rate results of Examples 1-3

[0060] Example Lampshade Appearance Antibacterial rate Example 1 The coating is uniform, with no powdering or paint peeling, and the lampshade's appearance and dimensions meet the standard requirements. ≥99％ Example 2 The coating is uniform, with no powdering or paint peeling, and the lampshade's appearance and dimensions meet the standard requirements. ≥99％ Example 3 The coating is uniform, with no powdering or paint peeling, and the lampshade's appearance and dimensions meet the standard requirements. ≥99％

[0061] This invention effectively combines water-based coating spraying and vacuum forming processes to bond photocatalytic materials to a vacuum-formed substrate and mold them into a lampshade, achieving a production step of first spraying the photocatalyst and then shaping it. Furthermore, by optimizing and adjusting key process parameters during water-based coating spraying, the uniformity of the coating and the efficiency of sterilization can be flexibly adjusted; by adjusting the coating curing temperature, the adhesion of the photocatalytic coating on the vacuum-formed substrate can be controlled; and by controlling the pre-forming heating and softening temperature, the adhesion of the coating on the surface of the photocatalytic sterilization lampshade made of different materials and the efficiency of sterilization can be improved, avoiding powdering and paint peeling. This results in a lampshade with excellent appearance and yield, maintaining an antibacterial rate of over 99%, and producing a sterilization lampshade with a uniform coating, no powdering or paint peeling, and whose appearance and dimensions meet standard requirements.

[0062] In addition, the spraying equipment is a special equipment mainly used for spraying vacuum-formed panels. It adopts a reciprocating low-mist moving spraying method and can complete the flat spraying operation in one go.

[0063] Comparative Examples 1-3

[0064] Germicidal Lamp Cover and its Manufacturing Process

[0065] The preparation process steps for Comparative Examples 1-3 are as follows, and the specific process parameters involved are shown in Table 3:

[0066] (1) Spraying process:

[0067] (a) Spraying photocatalyst material: Add photocatalyst coating to the paint tank; turn on the power of the sprayer and adjust the spraying pressure and flow rate parameters. The spraying pressure and flow rate of each embodiment are shown in Table 3 below; start the conveyor belt and place the blister pack on the conveyor belt with the frosted side facing up; start the sprayer, and when the blister pack is conveyed to the spray gun position, a layer of photocatalyst coating is sprayed onto the frosted surface of the blister pack; the photocatalysts of each embodiment are shown in Table 3 below;

[0068] (b) Heating and curing: After the spraying is completed, the thermoformed board is transferred to the oven for curing. The curing temperature and curing time of each embodiment are shown in Table 3 below. After the spraying and curing are completed, the power switches of the heating oven, spraying machine and conveyor belt are turned off.

[0069] (2) Vacuum forming process:

[0070] (a) Start the mask machine setting program: check if there are any foreign objects in the mask machine and clean them; check if each part of the mask machine is normal and adjust it; turn on the main power of the mask machine; after the equipment is normal, turn on the oven and set the heating and softening temperature and heating and softening time in the oven according to the different materials of the blister board; the materials of the blister board, the heating and softening temperature, and the heating and softening time of each embodiment are shown in Table 3 below;

[0071] (b) The thermoformed sheet is placed in an oven to soften it: The thermoformed sheet is placed in an oven to soften it;

[0072] (c) Place it above the mold and vacuum-form it to obtain a molded lampshade;

[0073] (d) Separate the molded lampshade and edge waste to obtain a germicidal lampshade.

[0074] Table 3 Process parameters for Comparative Examples 1-3

[0075]

[0076] The appearance of the germicidal lamp covers prepared in Comparative Examples 1-3 was evaluated, and the antibacterial rate of the germicidal lamp covers was tested. The antibacterial rate test reference standard is GB / T 30706 Test method and evaluation of photocatalytic antibacterial materials and products under visible light irradiation. The appearance evaluation and antibacterial rate results are shown in Table 4 below.

[0077] Table 4. Appearance evaluation and antibacterial rate results for Comparative Examples 1-3

[0078]

[0079]

[0080] When the curing temperature of Comparative Examples 1-3 was reduced to 30℃ or below, and the softening temperature was lowered to below 350℃, the resulting lampshade coating was uneven and exhibited sagging. After vacuum forming, powder and paint peeling occurred, the lampshade deformed severely, and the antibacterial rate did not reach 99%.

Claims

1. A process for the production of germicidal lamp covers, characterized in that, The preparation process comprises the following steps: (1) spraying process: spraying photocatalyst paint on the blister plate, curing, and obtaining the photocatalyst blister plate; the curing temperature is 50-80℃; (2) blistering process: heating and softening the photocatalyst blister plate, placing it on a mold for blistering, and obtaining the sterilization lampshade; the heating and softening temperature is 350-600℃, and the heating and softening time is 15-35s; The material of the blister plate comprises at least one of styrene, methyl methacrylate resin, styrene-methyl methacrylate resin copolymer, styrene-acrylate copolymer, polymethylpentene, allyl diglycol carbonate, polysulfone, polytricyclodecane methyl methacrylate, and cyclic olefin polymer; when the material of the blister plate is styrene, the heating and softening time is 20-26s; when the material of the blister plate is methyl methacrylate resin, the heating and softening time is 27-35s; when the material of the blister plate is styrene-methyl methacrylate resin copolymer, the heating and softening time is 26-29s.

2. The manufacturing process according to claim 1, characterized in that, The photocatalyst paint comprises a photocatalyst, and the photocatalyst comprises at least one of TiO2, ZnO, CeO2, Ta2O5, InVO4, MnO2, Bi2O3, and g-C3N4.

3. The manufacturing process of claim 1, wherein, The spraying pressure is 0.5-5kg.

4. The manufacturing process of claim 1, wherein, The spraying flow rate is 0.5-5 L / h.

5. The manufacturing process of claim 1, wherein, The curing time is 3-15min.

6. The manufacturing process of claim 1, wherein, The thickness of the blister plate is 1.5-2.5mm.

7. A germicidal lamp shield characterized by, The sterilization lampshade is obtained by the preparation process of any one of claims 1-6.

8. An air cleaner characterized by comprising: The air purifier comprises the sterilization lampshade of claim 7.

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