Building cleaning agents and methods for cleaning buildings using them

Abstract

This invention provides a cleaning agent for structures, such as agricultural greenhouses, that prevents cleaning residue from drying and sticking to the film surface even when the surface of the structure becomes hot, eliminates the need for brushing, easily removes accumulated dirt, is easy to spray, and causes little phytotoxicity to plants, as well as a cleaning method using this cleaning agent. [Solution] A building cleaning agent characterized by containing 0.5 to 30.0% by mass of glycerin and 0.01 to 3.0% by mass of a surfactant, resulting in a surface temperature of 30 to 120°C, or a building cleaning agent characterized by containing 0.5 to 30.0% by mass of glycerin and having a pH of 10.0 to 13.0, resulting in a surface temperature of 30 to 120°C, and a method for cleaning buildings using these building cleaning agents.

Description

Technical Field

[0001] The present invention relates to a cleaning agent for buildings with a surface temperature of 30 to 120°C and a method for cleaning buildings with a surface temperature of 30 to 120°C using the same.

Background Art

[0002] Buildings such as vinyl greenhouses, rigid film greenhouses, glass greenhouses and other agricultural greenhouses, solar panels, building exterior walls and roofs, commercial facilities such as arcades, power generation facilities and oil storage tanks, theme park facilities, bridges, and smoke exhaust towers generally accumulate dirt in 2 to 3 years. When dirt accumulates, the original function of the building deteriorates and the appearance worsens, and it is necessary to clean it.

[0003] For example, in the case of agricultural greenhouses, although it depends on the usage situation, when dirt accumulates, the transmittance of sunlight decreases. As a result, it has an adverse effect on the growth of cultivated crops, bringing about disadvantages such as poor growth, excessive growth, and a decrease in the yield. Conventionally, for such dirt, it has been dealt with by cleaning by brushing or by discarding and replacing it with a new film. However, cleaning agricultural greenhouses by brushing requires labor and time, especially for large-scale agricultural greenhouses, which takes 4 to 5 days. On the other hand, replacing with a new film requires a large amount of cost. Therefore, a method of spraying a cleaning agent onto agricultural greenhouses using a spray or a power sprayer for cleaning has been spreading.

[0004] Patent Document 1 discloses a method for cleaning an agricultural greenhouse in which an aqueous solution of a cleaning agent containing polyoxyethylene alkyl ether and alkaline hypochlorite is uniformly sprayed onto the film surface of a plastic greenhouse, and after leaving it standing, it is washed with jet water while brushing.

[0005] Also, Patent Document 2 discloses a cleaning agent composition for agricultural facilities composed of a specific water-soluble solvent and an alkaline agent, and further adding a surfactant and hypochlorous acid or its salt thereto, and a cleaning method for removing dirt with a power sprayer without using a brush after applying this to agricultural facilities.

[0006] Furthermore, Patent Document 3 discloses an agricultural greenhouse cleaning agent consisting of sodium hypochlorite and a surfactant, which removes pollen and other dirt simply by spraying and then using a water stream.

[0007] However, structures such as agricultural greenhouses are exposed to direct sunlight, and their surface temperatures often reach around 50°C to 70°C. In such high-temperature conditions, the cleaning agents described in Patent Documents 1 and 3 evaporate quickly, leaving behind cleaning residue that dries and adheres to the surface of the structure, making it difficult to achieve a sufficient cleaning effect even after rinsing.

[0008] Furthermore, it is unclear whether the cleaning agent described in Patent Document 2 can handle the above surface temperature, and there are problems such as the high viscosity of the aqueous solution making it difficult to spray from the nozzle of a power sprayer.

[0009] Furthermore, the cleaning agents described in the above patent documents all commonly cause phytotoxicity to surrounding plants and crops if they accidentally come into contact with them or if they run off into the soil, and in the worst case, can lead to their death.

[0010] Furthermore, while the cleaning agents described in the above-mentioned patent documents all disclose methods for manually cleaning agricultural greenhouses using sprays or power sprayers, manual cleaning of agricultural greenhouses can present safety challenges. Specifically, in high-altitude work, the risk of falls and slips increases due to unstable footing and fatigue from prolonged work. Additionally, the scattering of cleaning agents and loosened dirt can come into contact with the eyes and skin of workers near the cleaning area, potentially causing health problems. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Japanese Patent Application Publication No. 62-160179 [Patent Document 2] Japanese Patent Publication No. 2001-355000 [Patent Document 3] Japanese Patent Publication No. 2002-256290 [Overview of the Initiative] [Problems that the invention aims to solve]

[0012] Therefore, the object of the present invention is to provide a cleaning agent for structures, such as agricultural greenhouses, that prevents cleaning residue from drying and sticking to the film surface even when the surface of the structure becomes hot, allows for easy removal of accumulated dirt without the need for brushing, is easy to spray, and causes little phytotoxicity to plants, as well as a cleaning method using the cleaning agent. [Means for solving the problem]

[0013] As a result of diligent research to solve the above problems, the inventors of the present invention have found that a detergent containing glycerin and a surfactant in a specific concentration range, and a detergent containing glycerin in a specific concentration range and having a specific pH range, can solve the above problems, and have completed the present invention.

[0014] In other words, the present invention is as follows: [1] A building cleaning agent characterized by containing 0.5 to 30.0% by mass of glycerin and 0.01 to 3.0% by mass of a surfactant, which results in a surface temperature of 30 to 120°C. [2] A building cleaning agent as described in [1], having a pH of 7.0 to 9.0. [3] A building cleaning agent according to [1] or [2], wherein the mass ratio of surfactant to glycerin is 0.3 to 1.0. [4] A cleaning agent for buildings characterized by containing glycerin in an amount of 0.5 to 30.0% by mass and having a pH of 10.0 to 13.0. [5] The building cleaning agent described in [4] further contains a surfactant in an amount of 0.01 to 3.0% by mass. [6] A building cleaning agent according to [4] or [5], wherein the mass ratio of surfactant to glycerin is 0.3 to 1.0. A method for cleaning a building, characterized by spraying the cleaning agent for buildings according to any one of [1] to [6] onto a building having a surface temperature of 30 to 120°C. [8] A method for cleaning a building having a surface temperature of 30 to 120°C, characterized by spraying the cleaning agent for buildings according to any one of [1] to [6] onto the building using a drone.

Effect of the Invention

[0015] The cleaning agent for buildings of the present invention is difficult to evaporate even when the surface of a building such as an agricultural greenhouse is at a high temperature of 30 to 120°C. Therefore, the cleaning residue is difficult to dry and adhere to the film surface, brushing is not required, and accumulated dirt can be easily removed. It is an excellent product with little phytotoxicity to plants.

[0016] Also, the cleaning agent for buildings of the present invention having a surface temperature of 30 to 120°C has the above-mentioned properties and is easy to spray, so that workers can work safely. Furthermore, if a drone is used, workers can work with even higher safety.

Embodiments for Carrying Out the Invention

[0017] First, among the cleaning agents for buildings of the present invention having a surface temperature of 30 to 120°C (referred to as "the cleaning agent of the present invention"), those containing 0.5 to 30.0% by mass of glycerin and 0.01 to 3.0% by mass of a surfactant (hereinafter referred to as "the cleaning agent of the present invention 1") will be described.

[0018] The glycerin used in the cleaning agent of the present invention 1 has the effect of improving the detergency by swelling the dirt adhering to the building surface, and also has the property of suppressing evaporation due to its high boiling point as an azeotropic mixture solvent of water-solvent. Thereby, efficient cleaning and evaporation suppression of a building having a surface temperature of 30 to 120°C become possible.

[0019] The glycerin described above is derived from natural raw materials of animal or plant origin or manufactured by synthetic chemical methods. Specifically, it includes natural raw materials such as vegetable oils (e.g., palm oil, soybean oil, rapeseed oil), animal fats (e.g., beef tallow, fish oil), and synthetic glycerin starting from propylene oxide, but is not limited thereto. The glycerin obtained based on these raw materials can be applied in purified or unpurified form, and its purity is selected according to the application. For example, it is possible to use high-purity glycerin of 99% or more or food-grade glycerin. The purity and form of glycerin are appropriately adjusted according to the usage conditions and purposes.

[0020] In the cleaning agent 1 of the present invention, the glycerin concentration is 0.5 to 30.0% by mass (hereinafter simply referred to as "%"), preferably 1.0 to 20.0%, more preferably 2.0 to 15.0%. If it is lower than this range, the cleaning agent will evaporate immediately and sufficient cleaning power cannot be obtained. On the contrary, if it is higher, not only will the viscosity increase, resulting in deteriorated handling properties during liquid preparation and spraying, but also phytotoxicity may occur, such as the growth of plants being impaired or the plants dying due to osmotic stress caused by glycerin damaging plant cells.

[0021] The surfactant used in the cleaning agent 1 of the present invention has the effect of imparting wettability to the building surface, improving detergency, and, if necessary, imparting the retention of the cleaning liquid on inclined and vertical surfaces by foaming.

[0022] The type of surfactant used in the detergent 1 of the present invention is not particularly limited, and a wide range of available anionic, nonionic, betaine, and cationic surfactants can be used. Typical surfactants include, for example, anionic surfactants such as aliphatic monocarboxylates, linear alkylbenzene sulfonates, alkyl sulfates, alkyl ether sulfates, (mono)alkyl phosphates, α-sulfo fatty acid methyl esters, α-olefin sulfonates, and alkanesulfonic acids; nonionic surfactants such as sucrose fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, fatty acid alkanolamides, polyoxyethylene alkyl ethers, alkyl glycosides, and polyoxyethylene alkylphenyl ethers; betaine surfactants such as alkylamino fatty acid salts, alkyl betaines, and alkylamine oxides; and cationic surfactants such as alkyltrimethylammonium salts, dialkyldimethylammonium salts, alkyldimethylbenzylammonium salts, N-methylbishydroethylamine fatty acid esters, and hydrochloric acid. In addition to these surfactants, a wide range of surfactants derived from natural raw materials such as aliphatic monocarboxylates (soaps), casein, saponins, and lecithin can also be used. These surfactants can be used individually or in combination of two or more. Among these surfactants, betaine-based surfactants are preferred, and betaine-based alkyl betaines are more preferred, considering factors such as cleaning ability, availability, and foaming properties.

[0023] In the detergent 1 of the present invention, the concentration of the surfactant is 0.01 to 3.0%, preferably 0.1 to 1.0%, although this depends on the type of surfactant. If the concentration is higher than this range, phytotoxicity to crops may occur, excessive foaming may occur, and handling during solution preparation and spraying may deteriorate. In addition, the mass ratio of surfactant to glycerin (surfactant / glycerin) is preferably 0.3 to 1.0, and if it is higher than this range, phytotoxicity to crops may occur.

[0024] The present invention's cleaning agent 1 can be prepared by dissolving the above-mentioned glycerin and surfactant in water. The pH of the present invention's cleaning agent is preferably 7.0 to 9.0, and more preferably 7.0 to 8.0. Normally, dissolving the above-mentioned glycerin and surfactant in water results in a pH within this range, so it does not contain alkali metal salts, etc., as described later. If the pH is lower than this range, not only will sufficient cleaning performance not be obtained, but if it comes into contact with plants, it can damage the plant surface tissue, causing leaf burn and wilting, and if it leaches into the soil, it can disrupt the balance of metal ions that plants absorb from the soil, leading to poor growth, thus causing strong phytotoxicity to crops. Furthermore, since the present invention's cleaning agent 1 does not contain alkali metal salts, etc., it does not affect structures that are corroded by alkali metals, such as solar panels, metal surfaces, and surfaces coated with alkali-soluble paints (acrylic, urethane, polyester paints, etc.).

[0025] The cleaning agent 1 of the present invention is preferably diluted with water immediately before use, using the following kit. <Kit for the present invention's cleaning agent 1> (A) Aqueous solution of glycerin and surfactant

[0026] Next, we will describe a building cleaning agent of the present invention that contains glycerin in an amount of 0.5 to 30.0% by mass and has a pH of 10.0 to 13.0 (hereinafter referred to as "Cleaning Agent 2 of the Present Invention").

[0027] In the present invention's detergent 2, glycerin is used at the same concentration as in the present invention's detergent 1.

[0028] The pH of the cleaning agent 2 of the present invention is 10.0 to 13.0, preferably 11.5 to 12.5. If the pH is higher than this range, the cleaning performance will be further improved, but metals such as aluminum and steel used in the framework of agricultural greenhouses may be corroded, and damage to cells due to alkali may become significant, potentially causing phytotoxicity to crops.

[0029] In adjusting the pH of the detergent 2 of the present invention, an alkali metal salt is used because the pH of the aqueous solution of glycerin is near neutral. The alkali metal salt is not particularly limited to any type that becomes alkaline when dissolved in water, but examples include hydroxides such as sodium hydroxide, potassium hydroxide, and lithium hydroxide; carbonates such as sodium carbonate, potassium carbonate, and lithium carbonate; bicarbonates such as sodium bicarbonate, potassium bicarbonate, and lithium bicarbonate; sodium metasilicate, potassium metasilicate, and lithium metasilicate. These alkali metal salts can be used individually or in combination of two or more. Due to its availability and cost-effectiveness, sodium hydroxide is most preferably used.

[0030] In the present invention, it is preferable that the detergent 2 further uses the surfactant used in the present invention 1 at the same concentration as in the present invention. Furthermore, it is preferable that the mass ratio of the surfactant to glycerin be the same as in the present invention 1.

[0031] The detergent 2 of the present invention may be prepared by dissolving the above-mentioned glycerin in water and then adjusting the pH with an alkali metal salt, or by dissolving the above-mentioned glycerin and an amount of alkali metal salt sufficient to adjust the pH in water.

[0032] The present invention's cleaning agent 2 is preferably prepared using the following kit, mixed immediately before use, and diluted with water. <Kit for the present invention's cleaning agent 2> (A) Aqueous solution of glycerin (B) Alkali metal salts <Kit for the present invention's cleaning agent 2> (A) Aqueous solution of glycerin and surfactant (B) Alkali metal salts

[0033] The cleaning agent of the present invention described above preferably contains the above-mentioned components, and more preferably consists solely of the above-mentioned components. Furthermore, if the surfactant and glycerin used in the cleaning agent of the present invention are derived from natural raw materials, a product with a low environmental impact can be produced.

[0034] Furthermore, in order to further enhance the cleaning performance of the cleaning agent of the present invention, while observing the effects on phytotoxicity, it is also possible to use small amounts of known water-soluble solvents, oxidizing agents, etc.

[0035] As water-soluble solvents, for example, ethylene glycol, diethylene glycol, triethylene glycol, butyl carbitol, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethanolamine, diethanolamine, and triethanolamine can be preferably used.

[0036] The concentration of these water-soluble solvents in the cleaning agent of the present invention is determined to be in the range of 0.1 to 10.0%, preferably 0.5 to 5.0%. If the concentration is lower than this range, improvement in cleaning performance cannot be expected, and conversely, if it is higher, depending on the type, it may cause phytotoxicity to crops.

[0037] Examples of oxidizing agents include sodium hypochlorite, calcium hypochlorite, hypochlorous acid, sodium dichloroisocyanurate, sodium trichloroisocyanurate, sodium percarbonate, sodium persulfate, and peracetic acid. In particular, aqueous sodium hypochlorite solution is widely used at low cost and has high oxidizing power. When the concentration of the oxidizing agent in the present invention exceeds 1.5%, phytotoxicity to crops occurs frequently. When using an oxidizing agent, it is desirable to use it at a concentration of less than 1.2%.

[0038] The cleaning agent of the present invention may be used with thickeners and metal chelating agents to adjust or maintain viscosity. Examples of thickeners include polyethylene glycol, polyvinyl alcohol, carboxymethylcellulose, xanthan gum, and carrageenan. To maintain the performance of the anionic surfactant, appropriate amounts of metal chelating agents such as EDTA (ethylenediaminetetraacetic acid), NTA (nitrilotriacetic acid), ASDA (L-aspartic acid-N,N-diacetate tetrasodium salt), and DTPA (diethylenetriaminepentaacetic acid) may also be added. These thickeners and metal chelating agents can be used individually or in combination of two or more.

[0039] The cleaning agent of the present invention is suitable for cleaning structures with a surface temperature of 30 to 120°C, but cleaning is also possible even if the surface temperature is lower, for example, 0 to 30°C. Here, structures with a surface temperature of 30 to 120°C refer to structures whose surface temperature becomes as high as described above due to sunlight, or structures that become as high as described above due to heat generation by the structure itself. The structures are not particularly limited, but examples include agricultural greenhouses such as vinyl greenhouses, rigid film greenhouses, and glass greenhouses, solar panels, building exterior walls, roofs, commercial facilities such as arcades, power generation facilities, oil storage tanks, theme park facilities, bridges, smoke towers, outdoor units, and factory facilities. Among these structures, agricultural greenhouses, solar panels, building exterior walls, roofs, theme park facilities, smoke towers, outdoor units, and factory facilities are preferred because they cannot be cleaned with conventional cleaning agents.

[0040] The cleaning agent of the present invention is intended for use on buildings with a surface temperature of 30 to 120°C. In particular, the slow-drying effect due to the glycerin content becomes significant when the surface temperature is 30°C or higher, allowing for the maintenance of an excellent cleaning effect. However, since it may volatilize when the surface temperature exceeds 80°C, its use is preferable for buildings with a surface temperature of 30 to 80°C from the standpoint of workability.

[0041] The method of cleaning a building using the cleaning agent of the present invention is not particularly limited; it is sufficient to simply spray the cleaning agent onto the building. Tools for spraying include, for example, power sprayers, drones, and watering cans, but drones are preferred from the standpoint of safety. The spraying amount should be sufficient to uniformly wet the surface of the building, ranging from 100 to 500 ml / m². 2 Typically, 200 ml / m² 2The order of application should be appropriate. After spraying, dirt may be washed away by rain, etc., but it is advisable to rinse with water within a few minutes to a few days. If the surface temperature of the structure is very high (for example, above 80°C), it is advisable to rinse with water for a short time. Rinsing can be done using a high-pressure washer, power sprayer, hose, or drone. The water flow strength should preferably be a pump pressure of 0.1 to 10.0 MPa; if it is lower than this range, the dirt may not be removed effectively, and if it is higher, the agricultural greenhouse may be damaged. Brushing is generally not necessary at this time, but it may be done if necessary. [Examples]

[0042] The present invention will be described in detail below with reference to examples of the present invention, but the present invention is not limited in any way to these examples.

[0043] Examples 1-12, Comparative Examples 1-7 Preparation and testing of cleaning agents: The drying time, cleaning ability, phytotoxicity, and pH of the detergent formulations shown in Table 1 were evaluated.

[0044] (1) Preparation of detergent A detergent was prepared by dissolving predetermined amounts of glycerin (manufactured by Tokyo Chemical Industry Co., Ltd., reagent grade), sodium hydroxide (manufactured by Tokyo Chemical Industry Co., Ltd., reagent grade), and alkylamine oxide (manufactured by Clariant Japan Co., Ltd., Genaminox K-12) in water. The viscosity of the detergent was estimated to be 100 mPa·s or less, as it did not affect the spraying. In the comparative example, an agricultural greenhouse cleaning agent containing 12% sodium hypochlorite (manufactured by Green Laboratory Co., Ltd., Sigma) was adjusted so that the active ingredient (sodium hypochlorite) was 1.2%. In another comparative example, diethylene glycol monobutyl ether (also known as butyl carbitol, manufactured by Tokyo Chemical Industry Co., Ltd., reagent) was added to this, and the butyl carbitol was adjusted to 10% while the active ingredient (sodium hypochlorite) remained at 1.2%.

[0045] (2)pH measurement (1) A 0.2 mL sample of the cleaning agent prepared in (1) was taken, and the pH was measured immediately before spraying using a pH meter (LAQUA twin, manufactured by Horiba, Ltd.).

[0046] (3) Method for evaluating slow drying The method for evaluating the slow drying time of the object being cleaned involves changing the cleaning time of the agricultural greenhouse (e.g., morning and midday in summer) and monitoring the temperature with a thermal viewer (HIKMICRO, B10) while applying 200 ml / m² of cleaning agent. 2 The product was sprayed and left to stand for 0.5 hours. For tests with a surface temperature of 80°C or higher, a silicone rubber heater (Hakko Electric Co., Ltd., SBH4362) was attached directly beneath the film to maintain a surface temperature of 80°C or higher, and the evaluation was performed using the same method as above. After standing, the dryness of the dirt on the agricultural greenhouse was evaluated by rubbing it with a finger and checking whether any liquid residue remained on the finger, and a three-stage evaluation was performed according to the following criteria.

[0047] <Criteria for evaluating slow drying> (Evaluation) (Content) ○: Not dry. (Some liquid remains on the fingertips.) △: Slightly dry. (A small amount of liquid remains on the finger.) ×: It is dry. (Almost no liquid remains on the finger.)

[0048] (4) Method for cleaning agricultural greenhouses The top 2m of an agricultural greenhouse, which has been in use for 3 years, is covered with algae, pollen, sand, and dust. 2 Next, using a power sprayer (Koshinsha backpack-type manual sprayer, 10L tank, Grand Master RW-10DX), apply 400 ml (200 ml / m²) of the cleaning agent after 0.5 hours of preparation. 2 The product was sprayed. After 0.5 hours, the same power sprayer was used to rinse with water at a pump pressure of 1.0 MPa without any brushing.

[0049] (5) Method for evaluating the cleanability of agricultural greenhouses After washing, agricultural greenhouses were visually inspected and evaluated on a three-point scale according to the following criteria. Surface temperature was also measured using a thermal viewer (HIKMICRO, B10).

[0050] <Criteria for evaluating cleanability> (Evaluation) (Content) ○: The dirt has been completely removed. (Approximately 80% or more of the initial dirt has been removed.) △: Some stains remain. (Approximately 40% to less than 80% of the initial stains were removed.) ×: A significant amount of dirt remains. (Approximately less than 40% of the initial dirt was removed.)

[0051] (6) Method for evaluating drug-induced harm The tomato plants were transplanted into 500ml pots, and 20ml of cleaning solution was poured around the base of the plants when they had grown to a height of 25-30cm. After 7 days, the plants were visually observed and evaluated on a 4-point scale according to the following criteria.

[0052] <Criteria for evaluating drug-induced harm> (Evaluation) (Content) ○: Almost no wilting △: Approximately 20-40% of the plants are wilted. ×: More than 50% of the entire plant wilted. XX: Withering

[0053] [Table 1]

[0054] Based on the above results, the detergents containing glycerin and surfactants in a specific concentration range (Examples 1-7), the detergents containing glycerin in a specific concentration range and with a specific pH range (Examples 8-10), and the detergents combining these detergents (Examples 11-12) showed less evaporation, higher cleaning performance, and lower phytotoxicity compared to the comparative examples, even when applied to objects to be cleaned at high temperatures.

[0055] Note that in Example 6, the slow drying and cleaning properties were rated as △ at a surface temperature of 90°C. This is because these evaluations were performed after allowing the cleaning agent to stand for 0.5 hours after spraying. If the standing or cleaning was performed for a shorter time, the evaluation would be ○. The cleaning agents in the examples were generally usable up to 120°C.

[0056] Implementation Example 13 Cleaning agricultural greenhouses using drones: A 1000 ml aqueous solution containing 30.0% glycerin and 5.0% sodium hydroxide was placed in a container to prepare a concentrated detergent solution.

[0057] The concentrated detergent solution was diluted with 9.0 L of water to prepare the detergent. This detergent contained 3.0% glycerin and 0.5% sodium hydroxide, and had a pH of 12.3. After 0.5 hours, 200 ml / m² of the detergent was dispensed into an agricultural greenhouse (surface temperature 45°C) using a drone (DJI ARGASMG-1) equipped with a liquid supply hose. 2 The area was sprayed with water. After another 0.5 hours, the same drone was used to spray water at a pump pressure of 5.0 MPa to clean the agricultural greenhouse without any brushing. This cleaning removed approximately 80% or more of the dirt.

[0058] Furthermore, when spraying the cleaning agent with the drone and rinsing with water, the drone was operated from a safe distance of approximately 20 meters from the object being cleaned, ensuring that the cleaning solution and loosened dirt did not come into contact with the workers.

[0059] Example 14 Cleaning solar panels using drones: A 1000 ml aqueous solution containing 30.0% glycerin and 1.0% alkylamine oxide was placed in a container to prepare a concentrated detergent solution.

[0060] The concentrated cleaning solution was diluted with 9.0 L of water to prepare a cleaning agent. This cleaning agent contained 3.0% glycerin and 0.1% alkylamine oxide, and had a pH of 7.2. After 0.5 hours, the cleaning agent was sprayed onto a solar panel (manufactured by Kyocera Corporation) (surface temperature 75°C) soiled with pollen, dust, bird droppings, etc., using a drone, in the same manner as in Example 8. After another 0.5 hours, the solar panel was cleaned by spraying water with a pump pressure of 5.0 MPa using a drone, without any brushing. This cleaning removed approximately 90% or more of the dirt, and the gloss of the dull solar panel was restored. In addition, the power generation amount improved by 8%.

[0061] Furthermore, when spraying the cleaning agent with the drone and during rinsing, the drone was operated from a safe distance of approximately 2 meters from the object being cleaned, ensuring that the cleaning solution and loosened dirt did not come into contact with the workers. [Industrial applicability]

[0062] The present invention's building cleaning agent can be used on structures where the surface temperature reaches 30-120°C, such as agricultural greenhouses including vinyl greenhouses, rigid film greenhouses, and glass greenhouses; solar panels; building exteriors and roofs; commercial facilities such as arcades; power generation facilities and oil storage tanks; theme park facilities; bridges; and smoke towers.

Claims

1. A building cleaning agent characterized by containing 0.5 to 30.0% by mass of glycerin and 0.01 to 3.0% by mass of a surfactant, which results in a surface temperature of 30 to 120°C.

2. A building cleaning agent according to claim 1, wherein the pH is 7.0 to 9.

0.

3. The building cleaning agent according to claim 1, wherein the mass ratio of surfactant to glycerin is 0.3 to 1.

0.

4. A cleaning agent for buildings characterized by containing 0.5 to 30.0% by mass of glycerin and having a pH of 10.0 to 13.0, with a surface temperature of 30 to 120°C.

5. Furthermore, the building cleaning agent according to claim 4 contains a surfactant in an amount of 0.01 to 3.0% by mass.

6. The building cleaning agent according to claim 4, wherein the mass ratio of surfactant to glycerin is 0.3 to 1.

0.

7. A method for cleaning a building, characterized by spraying a building cleaning agent according to any one of claims 1 to 6 onto a building whose surface temperature is 30 to 120°C.

8. A method for cleaning a building, characterized by spraying a building cleaning agent according to any one of claims 1 to 6 onto a building whose surface temperature is 30 to 120°C using a drone.

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