Method for preparing glass for simulating oily dust accumulation on surface of photovoltaic panel

Abstract

The invention provides a method for preparing glass for simulating oily dust accumulation on the surface of a photovoltaic panel, and belongs to the technical field of photovoltaics. The method comprises the following steps: dropwise adding artificial oil stain onto a glass sheet, uniformly spin-coating, depositing dust on the glass sheet at the same time, and carrying out primary deposition and film coating; aging the glass sheet subjected to primary deposition and film covering to obtain a glass sheet with an oily dust accumulation layer; the step S1 is repeated for gradient deposition film coating and aging until the thickness of the oily dust accumulation layer reaches the target thickness, and the glass for simulating the oily dust accumulation on the surface of the photovoltaic panel is prepared; wherein in the step S2, when gradient deposition film coating is carried out, the spin coating speed during each time of deposition film coating is reduced in a gradient mode compared with the spin coating speed during last time of deposition film coating, and the time of each time of deposition film coating is increased in a gradient mode compared with the time of last time of deposition film coating. The method can solve the technical problems that a traditional simulated glass preparation method is long in consumed time and tedious in operation, and the uniformity and simulation degree of oil dirt dust retention are difficult to guarantee.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a method for preparing glass simulating oily dust accumulation on the surface of a photovoltaic panel. Background Art

[0002] The operating efficiency of photovoltaic power stations located near oil and fat factories is often affected by the complex pollutants caused by factory waste, especially the photovoltaic systems installed on the roof, which are often covered by a layer of oily dust film that is difficult to peel off naturally shortly after maintenance and cleaning. This layer of dust has multiple components and strong adhesion, which significantly reduces the light transmittance of photovoltaic glass panels and thus reduces the overall power generation efficiency of photovoltaic modules. When the factory production situation remains stable, the characteristics of these oily dusts show a high degree of similarity.

[0003] Traditional cleaning methods are ineffective for this type of stubborn oily dust, and special cleaning agents must be used to effectively remove it. In order to develop a more efficient and environmentally friendly cleaning solution, the first task is to simulate similar simulated glass sheets to reproduce the adhesion of oily dust on the photovoltaic panel glass. Naturally, simulating the adhesion of this type of oily dust on glass takes a long time, which is not conducive to the conduct of the experiment.

[0004] GB / T 35833-2018 "Kitchen Grease Cleaner" describes the preparation method of artificial dirt and the preparation method of glass substrate coated with artificial oil stain.

[0005] However, the use of this method to prepare glass that simulates oily dust accumulation on the surface of photovoltaic panels will have the following major technical problems. The entire preparation process, including the emulsification and aging of artificial oil pollution, and the preparation of dirt sheets (coating, aging, aging, etc.), takes more than 24 hours. This long preparation process is not conducive to the rapid progress of scientific research experiments, especially when it is necessary to frequently replace test samples or conduct multiple condition comparison tests, the efficiency is obviously insufficient. It is difficult to ensure the uniformity of the coating when forming oily dust on the glass by artificial coating, which will lead to large differences in distribution and thickness between the simulated oily dust glass and the oily dust on the actual photovoltaic panel surface, thereby affecting the accuracy and reliability of the test results. Summary of the invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a method for preparing glass that simulates oily dust accumulation on the surface of photovoltaic panels, so as to solve the technical problems that the traditional method of preparing simulated glass is time-consuming, cumbersome to operate, and difficult to ensure the uniformity and simulation degree of oily dust accumulation.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The present invention provides a method for preparing glass simulating oily dust accumulation on the surface of a photovoltaic panel, comprising the following steps:

[0009] S1: dropping artificial oil onto a glass sheet and evenly coating it by spin coating, and at the same time depositing dust on the glass sheet to perform a primary deposition coating; then aging the glass sheet after the primary deposition coating to obtain a glass sheet with an oily dust layer;

[0010] S2: Repeat the steps of S1 to perform gradient deposition coating and aging until the thickness of the oily dust layer reaches the target thickness, thereby preparing a glass simulating oily dust on the surface of a photovoltaic panel;

[0011] In S2, when gradient deposition of the coating is performed, the spin coating speed decreases gradually each time the coating is deposited compared to the spin coating speed of the previous deposition, and the time of each deposition of the coating increases gradually compared to the time of the previous deposition.

[0012] In one embodiment, in S1, the artificial oil pollution is prepared by mixing 65-70% edible oil, 20-25% lard and 10% glyceryl monostearate, by mass percentage.

[0013] In one embodiment, in S1, a spin coater is used for spin coating, and the speed parameters of the spin coating include the rotation speed of the spin coater and the acceleration of the spin coater;

[0014] When performing gradient deposition, the speed of the spin coater is reduced by 500 rad / min each time the coating is deposited, and the acceleration of the spin coater is reduced by 250 rad / s each time the coating is deposited. 2 .

[0015] In one embodiment, when performing gradient deposition coating, the minimum rotation speed of the spin coater is not less than 500 rad / min, and the acceleration of the spin coater is not less than half of the rotation speed of the spin coater.

[0016] In one embodiment, in S1, during the initial deposition of the coating, the rotation speed of the spin coater is 2500-3000 rad / min, and the acceleration of the spin coater is 1250-1500 rad / s 2 .

[0017] In one embodiment, when gradient deposition is performed, the time for each deposition is increased by 2 minutes compared to the time for the previous deposition.

[0018] In one embodiment, the air volume is the same each time the dust is deposited, and the air volume is 0.02-0.05m 3 / min.

[0019] 8. The method for preparing glass simulating oily dust accumulation on the surface of a photovoltaic panel according to claim 1, characterized in that in S1 and S2, the aging is carried out in a UV constant temperature box, and the aging time is 8 to 12 hours.

[0020] In one embodiment, the mass ratio of the artificial oil to dust is 1:1-10.

[0021] In one embodiment, a soot blowing step is further included after aging, and the soot blowing step is as follows:

[0022] Aim the sootblower at the surface of the glass sheet with an oily dust layer and blow away the dust on the surface.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a method for preparing glass simulating oily dust accumulation on the surface of a photovoltaic panel, wherein artificial oil is dripped onto a glass sheet to evenly distribute the oil on the surface of the glass sheet, and while the oil is spin-coated, dust is also deposited, effectively solving the problem of uneven distribution of oil on the simulated glass sheet, wherein the synchronous operation of spin-coating the oil and depositing the dust helps to evenly distribute dust particles in the oil, further enhancing the overall uniformity of the oil dust layer. The gradient deposition coating simulates the gradual accumulation of oil dust in the natural environment. Since the oil dust layer on the surface of an actual photovoltaic panel is often not formed in one go, but rather after a long period of accumulation, the gradient deposition can better simulate this process, making the simulation results closer to the actual situation.

[0025] Furthermore, gradually reducing the spin coating speed and acceleration helps to form a more uniform and dense dust layer on each layer of oil. As the number of layers increases, the cumulative effect of oil and dust will further enhance the uniformity and reduce the local unevenness caused by improper single operation. In addition, by repeating the steps of gradient deposition coating and aging, the thickness of the oil dust layer can be precisely controlled to meet the needs of different research and testing.

[0026] Furthermore, by gradually increasing the time of each deposition coating, each layer of oil and dust can have more time to interact and combine, which helps to form a more uniform and dense dust layer. This uniformity is not only reflected in the thickness of the dust layer, but also in the distribution of dust particles in the oil, reducing the phenomenon of local accumulation or sparseness. In the natural environment, the oil and dust on the surface of the photovoltaic panel gradually accumulate over time. By changing the gradient time, this natural accumulation process can be simulated, making the simulation results closer to the actual situation. The accumulation of each layer of oil and dust reflects the environmental conditions in different time periods, thereby improving the accuracy and reliability of the simulation. By changing the gradient time, the amount of oil and dust deposited in each layer and the degree of combination between them can be more accurately controlled. This precise control also helps to meet the needs of different research and testing, such as simulating the surface state of photovoltaic panels under different pollution levels and different environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of a method for preparing glass simulating oily dust accumulation on the surface of a photovoltaic panel according to the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the device for depositing a coating in the process of preparing glass simulating oily dust accumulation on the surface of a photovoltaic panel according to the present invention;

[0029] Among them: 1-oil dripping port; 2-dust distribution port; 3-blower port; 4-air outlet; 5-dust filtering device; 6-high-type protective cover; 7-spin coater; 8-rotating body. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0033] See also Figure 1 The present invention provides a method for preparing glass simulating oily dust accumulation on the surface of a photovoltaic panel, comprising the following steps:

[0034] S1: dropping artificial oil onto a glass sheet and evenly coating it by spin coating, and at the same time depositing dust on the glass sheet to perform a primary deposition coating; then aging the glass sheet after the primary deposition coating to obtain a glass sheet with an oily dust layer;

[0035] S2: Repeat the steps of S1 to perform gradient deposition coating and aging until the thickness of the oily dust layer reaches the target thickness, thereby preparing a glass simulating oily dust on the surface of a photovoltaic panel;

[0036] In S2, when gradient deposition of the coating is performed, the spin coating speed decreases gradually each time the coating is deposited compared to the spin coating speed of the previous deposition, and the time of each deposition of the coating increases gradually compared to the time of the previous deposition.

[0037] In one specific embodiment, the method for preparing the glass simulating oily dust accumulation on the surface of a photovoltaic panel is as follows:

[0038] Step S1: Initial deposition and aging

[0039] According to the mass percentage, 65-70% of edible oil, 20-25% of lard and 10% of glyceryl monostearate were mixed to prepare artificial oil stain. The prepared artificial oil stain was dropped onto a clean glass sheet. Then, a spin coater 7 was used at an initial speed of 2500-3000 rad / min and an initial acceleration of 1250-1500 rad / s. 2 Spin coating for 2 to 4 minutes. Spin the artificial oil stain evenly on the surface of the glass. 3The air volume of / min is passed through the dust outlet 2 to deposit the dust, completing the initial deposition coating. The coated glass sheet is placed in a UV constant temperature box for aging treatment, and the aging time is 8 to 12 hours to obtain a glass sheet with a preliminary oily dust layer.

[0040] Step S2: Gradient deposition and repeated aging

[0041] To achieve the target thickness of the oily dust layer, the steps in S1 are repeated to perform gradient deposition coating. During each repetition, the rotation speed of the spin coater 7 is reduced by 500 rad / min compared with the previous time until it is not less than 500 rad / min; at the same time, the acceleration is reduced by 250 rad / s compared with the previous time. 2 , and not less than half of the current rotation speed, so as to achieve a gradient decrease in the spin coating speed. The dust deposition air volume during each deposition remains unchanged at 0.02-0.05m 3 / min, and evenly spread the dust through the dust outlet 2. The time of each deposition coating is increased by 2 minutes compared with the previous time to ensure the gradual accumulation and compaction of the dust layer. After each gradient deposition coating is completed, it is necessary to perform aging treatment for 8 to 12 hours again, and repeat the above gradient deposition coating and aging process until the thickness of the oily dust layer reaches the predetermined standard, thereby preparing the oily dust glass simulating the surface of the photovoltaic panel.

[0042] During the entire preparation process, the mass ratio of artificial oil to dust was maintained at 1:1-10.

[0043] This embodiment also includes a soot blowing process. After each deposition coating and aging step, a soot blowing process is added to remove the floating dust that may remain on the surface of the glass sheet. A soot blowing tool is used to blow the surface of the glass sheet with an oily dust layer to ensure that the surface is clean and free of floating dust, further improving the realism and experimental effect of simulating the oily dust glass on the surface of the photovoltaic panel.

[0044] Dust blowing tools such as compressed air spray guns, soft brushes or special dust blowers can generate sufficient airflow or mechanical force to remove floating dust on the glass surface while avoiding damage to the glass and attached oily dust.

[0045] The method for preparing the glass simulating oily dust accumulation on the surface of photovoltaic panels provided in this embodiment is as follows: Figure 2 The device shown in the figure deposits the coating. The device includes a high-type protective cover 6, which is made of glass to form a closed glass cover environment. A spin coater 7 is arranged inside the high-type protective cover 6, and the spin coater 7 is connected to a rotating body 8, which is used to carry the glass substrate to be processed and rotate during the spin coating process.

[0046] A plurality of functional ports are provided on the top of the high-type protective cover 6, which are arranged in the following order from one end to the other: an oil drip port 1 for dripping simulated oily substances onto the rotating glass substrate; a dust distribution port 2 for evenly distributing simulated dust particles into the cover; an air outlet 4 for discharging the air in the cover and possible steam or residual gas, and a dust filter 5 is provided on the air outlet 4 to prevent the discharged air from carrying dust and polluting the external environment; and a blower port 3 close to one side of the air outlet 4, which is arranged on the side wall of the high-type protective cover 6 and is used to introduce processed air such as heated and humidified air to control the environmental conditions in the cover.

[0047] In particular, the blower port 3 is connected to the heater, blower and humidifier through a pipeline, and the three work together to provide clean airflow with suitable temperature and humidity into the cover, thereby simulating various climatic conditions that the photovoltaic panel may encounter in the actual environment.

[0048] In addition, in another embodiment, the number of times of gradient deposition is one, that is, deposition and aging are performed twice. During the second deposition, the rotation speed of the spin coater 7 is 2000-2500 rad / min, and the acceleration is 1000-1250 rad / s. 2 , the time is set to 4min~6min.

[0049] Specifically, the process is as follows:

[0050] Preparation of artificial oil pollution: Mix a certain amount of 65-70% edible oil + 20%-25% lard + 10% glyceryl monostearate using a magnetic stirrer and stir evenly for later use.

[0051] Initial deposition and aging:

[0052] After covering with the high-type protective cover 6, the glass sheet is placed on the rotating body 8. The spin coater 7 is turned on and the speed is set to 2500-3000 rad / min and the acceleration is set to 1250-1500 rad / s. 2 , the time is set to 2min~4min. At the same time, turn on the small blower (through the blower port 3) and set the air volume to 0.02~0.05m 3 / min. Add dry dust with a mass of 1 to 10 times the mass of the artificial oil droplets through the dust outlet 2 within the set time. During this period, the dust flows and settles in the protective cover 6. Maintain the blast temperature at 50 to 80°C to simulate the surface temperature of the photovoltaic panel when generating electricity; at the same time, the humidifier maintains the air outlet humidity at 40% to 60%. After the spin coater 7 stops, turn off the humidifier. The blower and heater continue to run for 1 minute and then stop. Take out the glass sheet after the dust settles. Take out the glass sheet, age it in a UV constant temperature box for 8 to 12 hours, and then gently blow off the floating dust on the surface to obtain a glass sheet with a preliminary oily dust layer.

[0053] Secondary deposition coating and aging:

[0054] After covering with the high-type protective cover 6, the aged glass sheet is placed on the rotating body 8 again. The spin coater 7 is turned on and the speed is set to 2000-2500 rad / min and the acceleration is set to 1000-1250 rad / s. 2 , the time is set to 4min~6min. At the same time, turn on the small blower (through the blower port 3), maintain the blowing temperature at 50~80℃, and the air volume at 0.02~0.05m 3 After the spin coating is completed, take out the glass sheet, age it in a UV constant temperature box for 8 to 12 hours, and then gently blow away the dust on the surface. At this time, the test piece can be used as a dirt sheet that evenly covers the oily dust.

[0055] And the repeated gradient deposition coating based on the above implementation is as follows:

[0056] Multiple gradient deposition coating and aging: When there are requirements for the quality of oily dust on the glass sheet, the third and fourth deposition coating and aging processes can be carried out.

[0057] The specific settings are as follows:

[0058] Each time the speed of the spin coater 7 is set to the speed of the previous level of film deposition minus 500 rad / min, but the minimum speed is not less than 500 rad / min. The acceleration is set to reduce the acceleration by 250 rad / s 2 , but the acceleration is not less than half of the current speed. The time is set to 2 minutes more than the previous level. While spinning, turn on the small blower (through the blower port 3), maintain the blowing temperature at 50-80℃, and the air volume at 0.02-0.05m 3 / min. The aging time is 8h~12h. After completion, gently blow off the dust on the surface. At this time, the test piece can be used as a dirt sheet to evenly cover the oily dust. Compared with the previous stage, the dust mass is larger and the oily dust coverage is more uniform.

[0059] The spin coater 7 evenly distributes the oil on the surface of the glass sheet by high-speed rotation, which effectively solves the problem that the traditional coating method is difficult to ensure uniformity, and the spin coating method is fast and continuous, which greatly improves the preparation efficiency. Combined with the dust sedimentation method, it can simulate the deposition process of dust on the surface of the oil in the natural environment, so that the simulation result is closer to the actual situation, and the uniform deposition of dust on the surface of the oil helps to form a more realistic oil dust accumulation layer. The time of each deposition coating gradually increases, giving the oil and dust more time to interact and combine. This gradient time change simulates the process of gradual accumulation of oil and dust over time in the natural environment, which improves the accuracy and reliability of the simulation. The aging treatment can enhance the adhesion of oil and dust on the surface of the glass sheet, making the simulated oil dust accumulation layer more stable. The aging under the UV constant temperature box simulates the light and temperature changes in the natural environment, which helps to form a more realistic oil dust accumulation characteristic. Compared with the traditional method that requires long-term aging and manual coating, this method significantly shortens the preparation time and improves the preparation efficiency by spin coating and gradient deposition.

[0060] Embodiment 1:

[0061] Preparation of artificial oil pollution: Use a magnetic stirrer to stir 100.0 g of 70% edible oil + 20% lard + 10% glyceryl monostearate evenly for later use; the dust is local soil that has been sieved through a 100-mesh sieve for later use.

[0062] Primary deposition coating: After covering with a high-type protective cover 6, place the glass sheet on a rotating body 8, start the spin coater 7, set the speed to 2500 rad / min, and the acceleration to 1500 rad / s 2 , the time is set to 2 minutes. At the same time, turn on the small blower through the dust outlet 2 (connected through the blower outlet 3), and set the air volume to 0.05m 3 / min, add 10.0g of dry dust, 10 times the mass of 1.0g of artificial oil, through the dust outlet 2 within 2min. During this period, the dust flows and settles in the protective cover 6, and the blast temperature is maintained at 80℃ to simulate the surface temperature of the photovoltaic panel when generating electricity. The humidifier maintains the air humidity at 60%. After the spin coater 7 stops, turn off the humidifier. The blower and heater continue to run for 1min and then stop, and take out the glass sheet after the dust settles.

[0063] Aging: Take out the glass sheet, age it in a UV constant temperature box for 12 hours, and then gently blow off the dust on the surface.

[0064] Secondary deposition coating: After covering the high-type protective cover 6 again, the aged glass sheet is placed on the rotating body 8 again, and the spin coater 7 is turned on, and the speed is set to 2000 rad / min and the acceleration is set to 1250 rad / s 2At the same time, the small blower is turned on through the blower port 3, but the blowing temperature is set to 80℃ and the air volume is adjusted to 0.05m 3 / min.

[0065] Secondary aging: Take out the glass sheet, age it in a UV constant temperature box for 12 hours, and then gently blow off the dust on the surface.

[0066] Obtain glass that is evenly covered with oily dust.

[0067] Embodiment 2:

[0068] Preparation of artificial oil pollution: Use a magnetic stirrer to stir 100.0 g of 70% edible oil + 20% lard + 10% glyceryl monostearate evenly for later use; the dust is local soil that has been sieved through a 100-mesh sieve for later use.

[0069] Primary deposition coating: After covering with a high-type protective cover 6, place the glass sheet on a rotating body 8, start the spin coater 7, set the speed to 3000 rad / min, and the acceleration to 1500 rad / s 2 , the time is set to 4 minutes. At the same time, turn on the small blower through the dust outlet 2 (connected through the blower outlet 3), and set the air volume to 0.05m 3 / min, add 1.0g of dry dust, which is 1 times the mass of 1.0g of artificial oil, through the dust outlet 2 within 4min. During this period, the dust flows and settles in the protective cover 6, and the blast temperature is maintained at 50℃ to simulate the surface temperature of the photovoltaic panel when generating electricity. The humidifier maintains the air humidity at 40%. After the spin coater 7 stops, turn off the humidifier. The blower and heater continue to run for 1min and then stop, and take out the glass sheet after the dust settles.

[0070] Aging: Take out the glass sheet, age it in a UV constant temperature box for 8 hours, and then gently blow off the dust on the surface.

[0071] Secondary deposition coating: After covering the high-type protective cover 6 again, the aged glass sheet is placed on the rotating body 8 again, and the spin coater 7 is turned on, and the speed is set to 2500 rad / min and the acceleration is set to 1250 rad / s 2 , the time is set to 6 minutes. At the same time, the small blower is turned on through the blower port 3, maintaining the blowing temperature at 50℃ and the air volume at 0.05m 3 / min.

[0072] Secondary aging: Take out the glass sheet, age it in a UV constant temperature box for 12 hours, and then gently blow off the dust on the surface.

[0073] Three deposition coatings and three agings: Cover with a high-type protective cover 6, place the glass sheet after the second aging on a rotating body 8, start the spin coater 7, set the speed to 2000 rad / min, and the acceleration to 1000 rad / s 2 At the same time, the small blower is turned on through the blower port 3 to maintain the blowing temperature within 50℃ and the air volume is adjusted to 0.05m 3 / min. The aging time is 8h. After the aging is completed, the dust on the surface is blown off gently. At this time, the test piece can be used as a dirt sheet to evenly cover the oily dust. Compared with the dirt sheet in the secondary deposition coating stage, the dirt sheet has a larger dust accumulation mass and more even coverage of the oily dust.

[0074] Embodiment 3:

[0075] Preparation of artificial oil pollution: Use a magnetic stirrer to stir 100.0 g of 65% edible oil + 25% lard + 10% glyceryl monostearate evenly for later use; the dust is local soil that has been sieved through a 100-mesh sieve for later use.

[0076] Primary deposition coating: After covering with a high-type protective cover 6, place the glass sheet on the rotating body 8, start the spin coater 7, set the speed to 2500 rad / min, and the acceleration to 1250 rad / s 2 , the time is set to 4 minutes. At the same time, turn on the small blower through the dust outlet 2 (connected through the blower outlet 3), and set the air volume to 0.02m 3 / min, add 1.0g of dry dust, which is 1 times the mass of 1.0g of artificial oil, through the dust outlet 2 within 4min. During this period, the dust flows and settles in the protective cover 6, and the blast temperature is maintained at 50℃ to simulate the surface temperature of the photovoltaic panel when generating electricity. The humidifier maintains the air humidity at 40%. After the spin coater 7 stops, turn off the humidifier. The blower and heater continue to run for 1min and then stop, and take out the glass sheet after the dust settles.

[0077] Aging: Take out the glass sheet, age it in a UV constant temperature box for 8 hours, and then gently blow off the dust on the surface.

[0078] Secondary deposition coating: After covering the high-type protective cover 6 again, the aged glass sheet is placed on the rotating body 8 again, and the spin coater 7 is turned on, and the speed is set to 2000 rad / min and the acceleration is set to 1000 rad / s 2 , the time is set to 6 minutes. At the same time, the small blower is turned on through the blower port 3, maintaining the blowing temperature at 50℃ and the air volume at 0.02m 3 / min.

[0079] Secondary aging: Take out the glass sheet, age it in a UV constant temperature box for 12 hours, and then gently blow off the dust on the surface.

[0080] Three deposition coating and three aging: Cover the high-type protective cover 6, place the glass sheet after the second aging on the rotating body 8, start the spin coater 7, set the speed to 1500rad / min, and the acceleration to 750rad / s2. At the same time, turn on the small blower through the blower port 3, maintain the blowing temperature within 50℃, and adjust the air volume to 0.02m 3 / min. The aging time is 8h. After the aging is completed, the dust on the surface is blown off gently. At this time, the test piece can be used as a dirt sheet to evenly cover the oily dust. Compared with the dirt sheet in the secondary deposition coating stage, the dirt sheet has a larger dust accumulation mass and more even coverage of the oily dust.

[0081] The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels provided by the present invention, firstly, combines the spin coating method and the dust settling method to produce a uniform oil film covering the surface of the glass sheet similar to the photovoltaic panel naturally formed in the oil factory area. Secondly, the gradient coating can achieve higher quality and more compact artificial oily dust accumulation on the glass sheet. Finally, the production speed is fast. Compared with long-term aging and manual coating, this method saves time and labor, and can eliminate the uneven coating caused by manual operation in the conventional method of preparing oily glass dust.

[0082] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels, characterized in that: The following steps are involved: S1: drop artificial oil onto the glass slide and spin-coat it evenly, and deposit dust on the glass slide at the same time for the initial deposition coating; Then, the glass sheet after the initial deposition coating is aged to obtain a glass sheet with an oily dust accumulation layer; S2: Repeat the steps of S1 to perform gradient deposition coating and aging until the thickness of the oily dust layer reaches the target thickness, thereby preparing a glass simulating oily dust on the surface of a photovoltaic panel; In S2, when gradient deposition of the coating is performed, the spin coating speed decreases gradually each time the coating is deposited compared to the spin coating speed of the previous deposition, and the time of each deposition of the coating increases gradually compared to the time of the previous deposition.

2. The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels according to claim 1, characterized in that: In S1, the artificial oil pollution is prepared by mixing 65-70% of edible oil, 20-25% of lard and 10% of glyceryl monostearate in terms of mass percentage.

3. The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels according to claim 1, characterized in that: In S1, a spin coater (7) is used for spin coating, and the speed parameters of the spin coating include the rotation speed of the spin coater (7) and the acceleration of the spin coater (7); When performing gradient deposition coating, the rotation speed of the spin coater (7) is reduced by 500 rad / min each time the coating is deposited compared with the rotation speed of the spin coater (7) during the previous coating deposition, and the acceleration of the spin coater (7) is reduced by 250 rad / s each time the coating is deposited compared with the acceleration of the spin coater (7) during the previous coating deposition. 2 .

4. The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels according to claim 3, characterized in that: When gradient deposition coating is performed, the minimum rotation speed of the spin coater (7) is not less than 500 rad / min, and the acceleration of the spin coater (7) is not less than half of the rotation speed of the spin coater (7).

5. The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels according to claim 3, characterized in that: In S1, during the initial deposition of the coating, the rotation speed of the spin coater (7) is 2500-3000 rad / min, and the acceleration of the spin coater (7) is 1250-1500 rad / s 2 .

6. The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels according to claim 1, characterized in that: When gradient deposition coating is performed, the time for each deposition coating is increased by 2 minutes compared with the time for the previous deposition coating.

7. The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels according to claim 1, characterized in that: The air volume is the same each time the dust is deposited, and the air volume is 0.02~0.05m 3 / min.

8. The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels according to claim 1, characterized in that: In S1 and S2, the aging is carried out in a UV constant temperature box, and the aging time is 8 to 12 hours.

9. The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels according to claim 1, characterized in that: The mass ratio of the artificial oil pollution to the dust is 1:1-10.

10. The method for preparing glass simulating oily dust accumulation on the surface of photovoltaic panels according to claim 1, characterized in that: It also includes a soot blowing step after aging, and the soot blowing step is as follows: Aim the sootblower at the surface of the glass sheet with an oily dust layer and blow away the dust on the surface.

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