Photovoltaic glass cleaning pre-filming agent, photovoltaic module cleaning device and cleaning method

Abstract

The invention discloses a cleaning pre-filming agent for photovoltaic glass, a photovoltaic module cleaning device and a cleaning method. The cleaning pre-filming agent for photovoltaic glass comprises raw material components including: 5-10% of nano-sized titanium dioxide, 1-2% of a silane coupling agent, 10-15% of a polymer with an amino functional group, 1-2% of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 0.3-0.5% of lauryl alcohol, 1-2% of an alcohol ether-based polymer, 0.2-0.4% of oleic acid, 0.01-0.02% of sodium hydroxide and the remainder of water. The cleaning pre-filming agent for photovoltaic glass of the invention has a basic cleaning function, and dust and oil stains are removed synchronously while cleaning the pre-filming. The obtained film layer has high transparency, low reflectivity, and significant permeability enhancement, and is superimposed with antistatic and dust-free properties, dustproof, decontamination, and permeability enhancement, and the comprehensive power generation is significantly improved, and the average value of the comprehensive power generation gain is more than 5%; the cleaning device has a simple structure, is easy to assemble, arrange, and operate.

Description

Technical Field

[0001] The invention relates to a cleaning pre-filming agent for photovoltaic glass, a photovoltaic component cleaning device and a cleaning method, and belongs to the technical field of nano coatings and photovoltaic components. Background Art

[0002] At present, with the rapid development of the global economy, the world's energy consumption has increased dramatically, traditional resources are consumed rapidly and are becoming increasingly scarce, and the difficulty of mining is increasing, making the world's energy supply tight. my country is in a stage of rapid economic development, with a large demand for energy. At present, the external dependence on oil has exceeded 50%, and the energy supply is seriously tight. Solar energy is a clean and renewable energy source. The solar energy radiated to the earth's surface each year is 35,000 times the total energy consumption of the earth. Moreover, solar energy is not restricted by region. In recent years, it has received widespread attention and rapid development in commercialization and academic research.

[0003] The function of photovoltaic modules is to convert solar energy into electrical energy and send it to batteries for storage, or to drive loads to work. The working principle of photovoltaic cells is based on the photoelectric effect, that is, when light shines on the surface of semiconductor materials, it will excite free carriers in the material, thereby generating current. Photovoltaic cells are usually composed of multiple solar cells, which are electrically connected together to form a photovoltaic cell group. With the sharp drop in the price of crystalline silicon, solar photovoltaic module power generation has become more and more popular and widely used. After photovoltaic modules are used outdoors for a long time, they will be dirty and affect power generation. For this reason, the present invention provides a cleaning pre-filming agent for photovoltaic glass, a photovoltaic module cleaning device and a cleaning method. Summary of the invention

[0004] The present invention provides a cleaning pre-filming agent for photovoltaic glass, a photovoltaic module cleaning device and a cleaning method. The cleaning pre-filming agent has the effect of film-forming and anti-reflection while cleaning, and improves the average value of the comprehensive power generation gain of the module by more than 5%.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A cleaning pre-filming agent for photovoltaic glass, the raw material components of which include: 5-10% of nano-grade titanium dioxide, 1-2% of a silane coupling agent, 10-15% of a polymer with an amino functional group, 1-2% of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 0.3-0.5% of lauryl alcohol, 1-2% of an alcohol ether-based polymer, 0.2-0.4% of oleic acid, 0.01-0.02% of sodium hydroxide and the balance of water, wherein the percentages are percentages by mass.

[0007] The alcohol ether-based polymer reacts with oleic acid to obtain alcohol ether-based oleate, which has the effects of decontamination, antistatic, film-forming, dispersion and the like; under the synergistic promotion of alcohol ether-based oleate and lauryl alcohol, it interacts with other components to obtain a stably dispersed dispersion; under the auxiliary film-forming and structural guidance of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, the polymer with amino functional group and silane coupling agent can interact with each other to form a film, and combine with nano-scale titanium dioxide to obtain a wear-resistant, weather-resistant, and anti-fouling anti-reflection film, and at the same time can inhibit the generation of static electricity on the surface of the substrate, so that dust is not easy to adhere to the substrate; the synergistic effect of mutual promotion between the raw materials is significant, and the attached dust can be self-cleaned when exposed to water, light, etc., so that the light transmittance and cleanliness of the photovoltaic glass surface are maintained for a long time, the efficiency attenuation of crystalline silicon photovoltaic modules is reduced, and the average comprehensive power generation gain of conventional modules is increased by more than 5%.

[0008] When the above cleaning pre-filming agent is used to clean and rub the photovoltaic glass and then dried naturally, a layer of anti-reflection film will be formed on the surface of the photovoltaic glass, which is anti-static, dust-free, easy to clean, anti-reflective, and decontamination, reducing the cleaning frequency and cleaning intensity. The next time you clean and rub, wipe off the residue and form a new film.

[0009] In order to improve the cleaning and anti-transmission effects, the polymer with amino functional group is a carbamate-based polymer; and the alcohol ether-based polymer is a polyoxymethylene glycol ether polymer.

[0010] The preparation method of the above-mentioned carbamate-based polymer is as follows: polypropylene glycol and toluene diisocyanate are stirred at 45-55°C for 2.5-3.5 hours under the catalytic action of dibutyltin diacetate; then 2,2-dihydroxymethylbutyric acid is added, and the chain extension reaction is carried out at 45-55°C for 1-1.5 hours, and then ammonia water is added for neutralization, and finally deionized water is added for dispersion and emulsification to obtain a carbamate-based polymer with a solid content of 18-25%. The mass ratio of polypropylene glycol to toluene diisocyanate is 1:(1.5-2).

[0011] The preparation method of the above-mentioned polyoxymethylene glycol ether polymer is as follows: formaldehyde and ethylene glycol in a mass ratio of 1: (1.8-2.2) are stirred and refluxed for 5.5-6.5 hours at a temperature of 120-130° C. and a pressure of 0.4-0.5 MPa under the catalysis of phosphomolybdic acid, neutralized, and distilled under reduced pressure to obtain the polyoxymethylene glycol ether polymer.

[0012] The above-mentioned cleaning and pre-filming agent for photovoltaic glass is used for cleaning and pre-filming of photovoltaic glass or solar photovoltaic modules; for example, when the power generation of photovoltaic modules is reduced by 30%, the photovoltaic modules can be cleaned.

[0013] The preparation method of the above-mentioned photovoltaic glass cleaning pre-filming agent is as follows:

[0014] 1) reacting an alcohol ether-based polymer and oleic acid under the catalysis of sodium hydroxide to obtain formaldehyde glycol ether oleate;

[0015] 2) The formaldehyde glycol ether oleate and other components are mixed, and then placed in an ultra-high pressure microfluidizer for treatment using an ultra-high pressure microfluidizer at a pressure of 300 to 500 MPa to obtain a cleaning pre-filming agent for photovoltaic glass.

[0016] The photovoltaic module has a large area. Manual cleaning alone has the problems of high intensity and low efficiency. Therefore, the present application has developed a photovoltaic module cleaning device, including a transmission device, a driving wheel, a first driven wheel, a first transmission belt, a second driven wheel, a third driven wheel, a second transmission belt, a cleaning device, a cleaning pre-filming agent box and a delivery pump;

[0017] The transmission device is connected to the driving wheel and drives the driving wheel to rotate; one end of the first transmission belt is sleeved on the driving wheel, and the other end is sleeved on the first driven wheel; one end of the second transmission belt is sleeved on the second driven wheel, and the other end is sleeved on the third driven wheel; the first transmission belt and the second transmission belt are opposite and parallel to each other;

[0018] The cleaning device is a columnar structure, and is provided with an infusion tube arranged along the length direction. The bottom of the cleaning device is provided with nozzles distributed along the length direction and communicated with the infusion tube. The two ends of the cleaning device in the length direction are respectively connected to the first conveyor belt and the second conveyor belt;

[0019] The cleaning pre-filming agent box, the delivery pump and the cleaning device are connected in sequence through pipelines. The cleaning pre-filming agent in the cleaning pre-filming agent box is delivered to the cleaning device through the delivery pump and then sprayed out from the nozzle; the cleaning pre-filming agent in the cleaning pre-filming agent box is the cleaning pre-filming agent for photovoltaic glass according to any one of claims 1 to 4.

[0020] The transmission device is a motor, etc. During cleaning, the transmission device drives the driving wheel to rotate, and then drives the first driven wheel to rotate through the first transmission belt. At the same time, the first transmission belt drives the cleaning device to operate, and during the operation of the cleaning device, it drives the second transmission belt to operate. The second driven wheel, the third driven wheel and the second transmission belt mainly play a role in assisting the operation and support of the cleaning device.

[0021] The above device can be controlled manually or automatically. In order to realize automatic control, the above photovoltaic module cleaning device also includes an automatic control system and a cleanliness sensor. The transmission device, the delivery pump and the cleanliness sensor are all connected to the automatic control system and controlled by the automatic control system. The cleanliness sensor is used to sense the cleanliness of the photovoltaic module surface.

[0022] The automatic control system of the present application may adopt an existing PLC electric control cabinet, etc. The present application does not make any special improvements to the structure, control method, etc. of the automatic control system, so they will not be elaborated.

[0023] If the area of ​​the photovoltaic module to be cleaned is large, it can be cleaned in sections, and a cleanliness sensor is installed in each section. The installation of the cleanliness sensor does not affect the cleaning, and can be installed with the help of a mounting bracket according to the on-site conditions.

[0024] In order to facilitate the stroke control of the cleaning device, the above-mentioned photovoltaic module cleaning device also includes two limit switches, which are respectively arranged at the two ends between the driving wheel and the first driven wheel. When the cleaning device touches the limit switch, it will run in the opposite direction. The materials used for the first conveyor belt and the second conveyor belt are both steel wire ropes; three rows of nozzles are arranged at the bottom of the cleaning device, namely the bottom row nozzle, the front row nozzle and the rear row nozzle, and the front row nozzle and the rear row nozzle are respectively arranged at 45° before and after the bottom row nozzle. That is, the angle between the line connecting the axial center of the cleaning device and the center of the bottom row nozzle and the line connecting the axial center of the cleaning device and the center of the front or rear row nozzle is 45°. The cleaning pre-filming agent sprayed by the bottom row nozzle and the front row nozzle can complete the soaking and cleaning of dirt, and the cleaning pre-filming agent sprayed by the rear row nozzle can form a film to increase transmittance.

[0025] The cleaning device is provided with a detachable elastic wiper outside the bottom nozzle, which is convenient for cleaning the photovoltaic module. In this way, the cleaning pre-filming agent sprayed by the bottom row nozzle and the front row nozzle combined with the elastic wiper can complete the soaking and cleaning of dirt, and the cleaning pre-filming agent sprayed by the rear row nozzle can form a film with enhanced transmittance.

[0026] As one of the implementation schemes, the transmission device, the driving wheel, the first driven wheel, the second driven wheel and the third driven wheel are all provided with lifting frames at the bottom, and each lifting frame is connected to and controlled by the automatic control system. When there is no need to scrub the surface of the photovoltaic module, the elastic wiper at the bottom of the cleaning device can be raised to not contact the surface of the photovoltaic module. Whether to install the lifting frame can be selected according to actual needs. If the temperature is low, in order to prevent the cleaning device from freezing together with the photovoltaic module, a lifting frame can be set up, and the cleaning device can be raised and separated from the surface of the photovoltaic module after cleaning; or if the cleaning device will block the photovoltaic module, a lifting frame can be set up to reduce the blocking of the photovoltaic module.

[0027] The transmission device and the driving wheel are connected together, and the lifting frame of the two is also shared.

[0028] A method for cleaning a photovoltaic module: a driving wheel, a first driven wheel, a second driven wheel and a third driven wheel are movably connected at the four corners of the photovoltaic module, and a cleaning device is placed on the surface of the photovoltaic module; the cleaning device sprays a cleaning pre-filming agent on the surface of the photovoltaic module and completes the cleaning, and after the spraying and cleaning are completed, the surface is naturally dried.

[0029] The transmission device is installed on the bracket at the corner of the photovoltaic module, or on an external bracket, which is determined according to the site conditions, and it is ensured that the transmission device can drive the driving wheel smoothly. The cleaning pre-filming agent box and the delivery pump are placed on the platform next to the photovoltaic module.

[0030] When in use, as one of the implementation schemes, the inverter of the photovoltaic module is connected to the automatic control system; the cleanliness sensor is installed above the photovoltaic module through a bracket; the automatic control system receives the value sensed by the cleanliness sensor and the power generation value of the inverter. When the value sensed by the cleanliness sensor exceeds the set value or the reduction in the power generation of the photovoltaic module exceeds the set value, the automatic control system controls the delivery pump and the transmission device to automatically start, the elastic wipe at the bottom of the cleaning device contacts the surface of the photovoltaic module, the cleaning device moves back and forth between the driving wheel and the first driven wheel, and the cleaning pre-filming agent sprayed by the nozzle is used to complete the soaking and cleaning of the dirt. When the set cleaning time is reached, the delivery pump and the transmission device stop running, and the automatic control system controls the lifting frame to rise, so that the bottom of the cleaning device does not contact the surface of the photovoltaic module, and the cleaning pre-filming agent remaining on the surface of the photovoltaic module naturally forms a film.

[0031] The technologies not mentioned in the present invention are all referred to the prior art.

[0032] The present invention has the following beneficial effects:

[0033] 1. The cleaning and pre-filming agent for photovoltaic glass of the present invention has both basic cleaning functions and film-forming and anti-reflection effects, and can remove dust and oil stains while cleaning the pre-filming.

[0034] 2. The obtained film layer has high transparency, low reflectivity, and significant transmittance enhancement. It is anti-static and dust-proof, and can prevent dust, remove dirt, and enhance transmittance. The comprehensive power generation is significantly improved, and the average comprehensive power generation gain is more than 5%.

[0035] 3. The water contact angle is small, and the dust or stains on the surface can be self-cleaned when encountering rain or condensation, reducing the cleaning frequency.

[0036] 4. Quick drying at room temperature will form an anti-reflective film on the surface of the photovoltaic glass, which is anti-static, dust-free, easy to clean, and anti-reflective, reducing the cleaning frequency and intensity.

[0037] 5. The cleaning device has a simple structure and is easy to assemble, arrange and operate.

[0038] 6. Save labor, be intelligent, save costs, and better meet user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The photovoltaic glass cleaning pre-filming agent prepared in Example 3 of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the photovoltaic module cleaning device of the present invention;

[0041] Figure 3 A schematic diagram of the nozzle setting is provided;

[0042] Figure 4 A photovoltaic module cleaned by using the photovoltaic glass cleaning pre-filming agent prepared by Example 3 of the present invention;

[0043] In the figure, 1 is a transmission device, 2 is a driving wheel, 3 is a first driven wheel, 4 is a first transmission belt, 5 is a second driven wheel, 6 is a third driven wheel, 7 is a second transmission belt, 8 is a cleaning device, 801 nozzle, 9 is a cleaning pre-filming agent box, 10 is a delivery pump, 11 is an automatic control system, 12 is a cleanliness sensor, 13 is a limit switch, 14 is a pipeline, and 15 is a cleaning pre-filming agent for photovoltaic glass. DETAILED DESCRIPTION

[0044] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0045] The directional words such as up and down, left and right, horizontal and vertical in this application are all based on the relative orientation or position relationship shown in the drawings and should not be understood as absolute limitations on this application. If no specific temperature is mentioned in each example, it is completed at room temperature (15-30°C).

[0046] Example 1

[0047] Preparation of polyoxymethylene glycol ether polymer: 135g formaldehyde, 285g ethylene glycol and 5.2g phosphomolybdic acid are mixed and added to a reaction device connected with a water separator and a condenser; the mixture is stirred and refluxed for 6.5h at a temperature of 120°C and a pressure of 0.5Mpa; after the reaction is completed, 5wt% sodium hydroxide solution is added to adjust the pH to 7; and the polyoxymethylene glycol ether polymer is obtained by reduced pressure distillation at 150°C and -0.09Mp with a yield of 62.3%.

[0048] Example 2

[0049] Preparation of carbamate-based polymer: 37g of polypropylene glycol PPG-600 (Haian Petrochemical Plant, Jiangsu Province, hydroxyl value mgKOH / g: 170-208) and 63g of toluene diisocyanate (TDI) were stirred at 55°C for 3.5 hours under the catalytic action of 0.05g of dibutyltin diacetate; then 138g of chain extender 2,2-dihydroxymethylbutyric acid was dissolved in 195g of propylene glycol butyl ether and added to the reactants obtained above, and the reaction was continued at 55°C for 1.5 hours; 260g of ammonia water with a mass concentration of 25% was added for neutralization, and the resulting material was added to 1485g of deionized water for emulsification to obtain a carbamate-based polymer with a solid content of about 23%.

[0050] Example 3

[0051] Preparation of a cleaning pre-filming agent for photovoltaic glass:

[0052] 1) After vacuum dehydration of 300 g of polyoxymethylene glycol ether polymer (prepared in Example 1), 60 g of oleic acid and 3 g of sodium hydroxide were added, and the mixture was vacuumed and heated to 180° C. under stirring, and the reaction was continued for 7 h. The acid value was measured by sampling, and if it was less than 15 mg KOH / g, the reaction was terminated, and vacuum dehydration was carried out at 50-60° C. to obtain formaldehyde glycol ether oleate;

[0053] 2) 206.6g of nano-sized titanium dioxide (PTT-GA05, anatase type, 5nm, Baoket New Materials), 41.3g of silane coupling agent (KH-560, Bogang), 619.5g of carbamate-based polymer (prepared in Example 2), 41.3g of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (alcohol fat twelve, Eastman C12), 12.4g of lauryl alcohol, 100g of formaldehyde glycol ether oleate and 3110g of water were placed in an ultra-high pressure microfluidizer and treated with 400MPa ultra-high pressure microfluidizer pressure to obtain a cleaning pre-filming agent for photovoltaic glass. Figure 1 As shown, a cleaning pre-filming agent is obtained, with appearance: transparent colorless to light milky white liquid, density: 0.95±0.1 (g / ml), pH: 7.5±1.0, and room temperature stability of more than 24 months.

[0054] Comparative Example 1

[0055] The difference from Example 3 is that formaldehyde glycol ether oleate is omitted, and the rest is the same as Example 3. Precipitation occurs after standing for 1 hour.

[0056] Comparative Example 2

[0057] The difference from Example 3 is that octylphenol polyoxyethylene ether (OP-10) is used to replace formaldehyde glycol ether oleate, and the rest is the same as Example 3. After standing for 2 weeks, precipitation occurs.

[0058] Example 4

[0059] like Figure 2 As shown, a photovoltaic module cleaning device includes a transmission device (motor), a driving wheel, a first driven wheel, a first transmission belt, a second driven wheel, a third driven wheel, a second transmission belt, a cleaning device, a cleaning pre-filming agent box and a delivery pump; the first transmission belt and the second transmission belt are both made of steel wire rope;

[0060] The transmission device is connected to the driving wheel and drives the driving wheel to rotate; one end of the first transmission belt is sleeved on the driving wheel, and the other end is sleeved on the first driven wheel; one end of the second transmission belt is sleeved on the second driven wheel, and the other end is sleeved on the third driven wheel; the first transmission belt and the second transmission belt are opposite and parallel to each other;

[0061] The cleaning device is a columnar structure, and is provided with an infusion tube arranged along the length direction. The bottom of the cleaning device is provided with nozzles distributed along the length direction and communicated with the infusion tube. The two ends of the cleaning device in the length direction are respectively connected to the first conveyor belt and the second conveyor belt;

[0062] The cleaning pre-filming agent box, the delivery pump and the cleaning device are connected in sequence through pipelines. The cleaning pre-filming agent in the cleaning pre-filming agent box is delivered to the cleaning device through the delivery pump and then sprayed out from each nozzle.

[0063] Example 5

[0064] On the basis of Example 4, the following improvements were made: Figure 2 As shown, a photovoltaic module cleaning device also includes an automatic control system (PLC electric control cabinet), a cleanliness sensor and two limit switches. The transmission device, the delivery pump, the cleanliness sensor and the two limit switches are all connected to the automatic control system and controlled by the automatic control system. The cleanliness sensor is used to sense the cleanliness of the surface of the photovoltaic module. The two limit switches are respectively arranged at the two ends between the driving wheel and the first driven wheel.

[0065] Example 6

[0066] On the basis of Example 5, the following improvements were further made: Figure 3 As shown, there are three rows of nozzles at the bottom of the cleaning device, namely the bottom row nozzles, the front row nozzles and the rear row nozzles. The front row nozzles and the rear row nozzles are respectively arranged at 45 degrees before and after the bottom row nozzles, and the interval between two adjacent nozzles in the same row is 20 cm. Cleaning cotton (replaceable) is arranged outside the nozzles at the bottom of the cleaning device.

[0067] Example 7

[0068] On the basis of Example 6, the following improvements are further made: the transmission device, the driving wheel, the first driven wheel, the second driven wheel and the third driven wheel are all provided with lifting frames at the bottom, and each lifting frame is connected to and controlled by the automatic control system, and when there is no need to scrub the surface of the photovoltaic module, the cleaning cotton at the bottom of the cleaning device can be raised to not contact the surface of the photovoltaic module. The transmission device and the driving wheel are connected together, and the lifting frames of the two are also shared.

[0069] The method for cleaning the photovoltaic module panel using the above-mentioned devices is as follows: the driving wheel, the first driven wheel, the second driven wheel and the third driven wheel are movably connected at the four corners of the photovoltaic module (when a lifting frame is included, the driving wheel, the first driven wheel, the second driven wheel and the third driven wheel are movably connected at the four corners of the photovoltaic module through the lifting frame, and a clamping structure can be provided at the bottom of the lifting frame to achieve the movably connected with the four corners of the photovoltaic module through the clamping structure), the transmission device and the driving wheel are located in the same plane (an external bracket can be used according to the site conditions, as long as the transmission device can drive the driving wheel smoothly, when a lifting frame is included, the driving wheel and the first driven wheel are arranged on the same lifting frame), the cleaning device falls on the surface of the photovoltaic module; the cleaning pre-filming agent box and the conveying pump are placed on the platform next to the photovoltaic module. Two limit switches are movably installed on the photovoltaic module between the driving wheel and the first driven wheel, and the limit switches do not contact the first conveyor belt.

[0070] If the area of ​​the photovoltaic panel to be cleaned is large, it can be cleaned in sections and a cleanliness sensor is installed in each section. The installation of the cleanliness sensor does not affect the cleaning and can be installed with the help of a mounting bracket according to the site conditions, as long as it can sense the cleanliness of the section.

[0071] The inverter of the photovoltaic module is connected to the automatic control system; the cleanliness sensor is installed above the photovoltaic module through a bracket; the automatic control system receives the value sensed by the cleanliness sensor and the power generation value of the inverter. When the value sensed by the cleanliness sensor exceeds the set value or the power generation of the photovoltaic module decreases by more than the set value, the automatic control system controls the delivery pump and the transmission device to automatically start, the transmission device drives the driving wheel to rotate, and then drives the first driven wheel to rotate through the first transmission belt. At the same time, the first transmission belt drives the cleaning device to operate. During the operation of the cleaning device, it will drive the second transmission belt to operate, and the second driven wheel, the third driven wheel and the second The conveyor belt mainly plays an auxiliary and supporting role. The cleaning pre-filming agent in the cleaning pre-filming agent box is transported to the cleaning device through the delivery pump and then sprayed from each nozzle to the surface of the photovoltaic module. The cleaning cotton at the bottom of the cleaning device contacts the surface of the photovoltaic module panel. The cleaning device reciprocates between the driving wheel and the first driven wheel (the cleaning device automatically reciprocates when it hits the limit switches on both sides) to achieve spray cleaning of the surface of the photovoltaic module. When the set cleaning time is reached, the delivery pump and the transmission device stop running, and the automatic control system controls the lifting frame to rise, so that the bottom of the cleaning device does not contact the surface of the photovoltaic module, and it dries naturally to form an anti-reflection film on the surface of the photovoltaic module. There are three rows of nozzles at the bottom of the cleaning device. Before the cleaning device runs back and forth between the driving wheel and the first driven wheel for the last time, the cleaning pre-filming agent sprayed by the cleaning device nozzle can soak and clean the dirt. When the cleaning device runs between the driving wheel and the first driven wheel for the last time, the cleaning pre-filming agent sprayed by the front nozzle can soak the dirt to a certain extent. The cleaning pre-filming agent sprayed by the bottom nozzle and the front nozzle is also used for the cleaning cotton at the bottom of the cleaning device to scrub the photovoltaic module. The cleaning pre-filming agent sprayed by the rear nozzle is used for film formation and anti-reflection, and the cleaning and film formation and anti-reflection of the surface of the photovoltaic module are completed at the same time. It is simple and efficient. When the photovoltaic module panel is cleaned for the next time, the previous film will be washed off and covered with a new film.

[0072] The cleaning pre-filming agent obtained in each example can be used to clean and film the photovoltaic modules using the cleaning device in Examples 4-7, or it can be cleaned, wiped or scraped manually; manually, 4 people can construct about 2,000 square meters per day, while using the cleaning device in Examples 4-7, 1 person can construct more than 15,000 square meters per day.

[0073] The cleaning pre-filming agent obtained in each example was used to conduct a cleaning test on the photovoltaic module panel (refer to JC T2170-2013), and the results are as follows:

[0074]

[0075] The change in light transmittance of the photovoltaic panel before and after cleaning refers to the difference between the light transmittance after the use of the cleaning pre-filming agent and the light transmittance before the use of the cleaning pre-filming agent when the photovoltaic panel is in a clean state. The change in light transmittance after the abrasion test refers to the difference between the transmittance after the abrasion test and the transmittance before the abrasion test after cleaning. The change in light transmittance after the UV test (%) refers to the difference between the transmittance after the UV test and the transmittance before the UV test after cleaning. The light transmittance test band is 380~1100nm.

Claims

1. A cleaning pre-filming agent for photovoltaic glass, characterized in that: The raw material components include: 5-10% of nano-grade titanium dioxide, 1-2% of silane coupling agent, 10-15% of polymer with amino functional group, 1-2% of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 0.3-0.5% of lauryl alcohol, 1-2% of alcohol ether polymer, 0.2-0.4% of oleic acid, 0.01-0.02% of sodium hydroxide and the balance of water, wherein the percentage is the mass percentage; The alcohol ether-based polymer is a polyoxymethylene glycol ether polymer; The alcohol ether polymer and oleic acid react under the catalysis of sodium hydroxide to obtain formaldehyde glycol ether oleate; The photovoltaic glass is cleaned and coated with the cleaning and pre-filming agent, and is naturally dried to form an anti-reflection film on the surface of the photovoltaic glass. The residue is wiped off during the next cleaning and pre-filming to form a new film.

2. The photovoltaic glass cleaning pre-filming agent according to claim 1, characterized in that: The amino-functional polymer is a carbamate-based polymer.

3. The cleaning pre-filming agent for photovoltaic glass according to claim 2, characterized in that: Preparation method of carbamate-based polymer: polypropylene glycol and toluene diisocyanate are stirred at 45-55°C for 2.5-3.5 hours under the catalysis of dibutyltin diacetate; then 2,2-dihydroxymethylbutyric acid is added, and the chain extension reaction is carried out at 45-55°C for 1-1.5 hours, and then ammonia water is added for neutralization, and finally deionized water is added for dispersion and emulsification to obtain a carbamate-based polymer.

4. The photovoltaic glass cleaning pre-filming agent according to any one of claims 1 to 3, characterized in that: The preparation of polyoxymethylene glycol ether polymer is as follows: formaldehyde and ethylene glycol in a mass ratio of 1: (1.8-2.2) are stirred and refluxed for 5.5-6.5 hours at a temperature of 120-130°C and a pressure of 0.4-0.5 MPa under the catalysis of phosphomolybdic acid, neutralized, and distilled under reduced pressure to obtain polyoxymethylene glycol ether polymer.

5. A method for preparing a cleaning pre-filming agent for photovoltaic glass according to any one of claims 1 to 4, characterized in that: The steps include: 1) reacting an alcohol ether polymer and oleic acid under the catalysis of sodium hydroxide to obtain formaldehyde glycol ether oleate; 2) The formaldehyde glycol ether oleate and other components are mixed, and then placed in an ultra-high pressure microfluidizer for treatment using an ultra-high pressure microfluidizer at a pressure of 300 to 500 MPa to obtain a cleaning pre-filming agent for photovoltaic glass.

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