Water-based anti-sticking absorption liquid for high-temperature exhaust gas spray treatment and preparation method thereof

Abstract

This invention relates to the field of industrial organic waste gas purification and treatment technology, and particularly to an anti-adhesion absorbent liquid for high-temperature waste gas spray treatment in coating processes and its preparation method. The absorbent liquid consists of the following components by volume percentage: PEG600 13.4 vol%–22.0 vol%, Tween 80 2.8 vol%–6.0 vol%, triethanolamine 0.9 vol%–2.5 vol%, an alkaline co-solvent of anhydrous Na2CO3 or NaHCO3, and deionized water as the balance; wherein the sum of the volume percentages of PEG600, Tween 80, and triethanolamine is 17.1 vol%–30.5 vol%. Under simulated spray dynamic contact conditions (oscillation at 80°C), 10 mL can completely disperse 0.5 g–1.0 g of standard simulated pollutants (a mixture of benzoin oxide and tar solids); after absorption, the system pH ≈ 10 (sodium carbonate system) or pH ≈ 9 (sodium bicarbonate system). The absorbent of this invention comes into contact with high-temperature waste gas in the form of a spray and utilizes the high-temperature environment to enhance the dissolution and absorption effect. Even after gradual cooling, the system can still maintain uniformity and stability, without precipitation, stickiness, or adhesion to the wall, thus inhibiting adhesion and blockage from the source.

Description

Technical Field

[0001] This invention relates to the field of industrial organic waste gas purification and treatment technology, and in particular to a water-based anti-adhesion absorbent liquid for high-temperature waste gas spraying treatment in coating processes and its preparation method. Background Technology

[0002] On powder coating production lines for components such as air conditioner housings, sheet metal parts, and heat exchanger brackets, 0.5–2.0 wt% benzoin (diphenylethanol ketone) is typically added as a leveling and defoaming agent to improve coating leveling and eliminate pinhole defects. When the workpiece is baked at high temperatures in a curing oven at 200–220 °C, benzoin-based leveling agents undergo thermal oxidation and decomposition, generating benzoin oxides and volatile organic compounds (VOCs) such as benzaldehyde and benzoic acid. Simultaneously, the high-temperature chain lubricating oil used in the curing oven's drive system volatilizes, cracks, polymerizes, and undergoes deep carbonization, forming a large amount of water-insoluble, highly viscous heavy tar-like substances. These benzoin oxides, pyrolytic VOCs, and tar-like substances together constitute high-temperature composite waste gas, representing a key and challenging aspect of waste gas treatment in the coating industry.

[0003] Currently, the mainstream treatment methods for this type of waste gas in the industry are water spraying or water-alkali spraying. The main purpose is to cool the high-temperature waste gas and attempt to perform preliminary washing of the pollutants. However, in actual long-term operation, this conventional process has insurmountable core technical defects: First, pure water or alkaline spraying has extremely low solubility and poor emulsification and dispersion capabilities for benzoin oxidation products, pyrolysis organic components, and lubricating oil cracking tar. It is difficult to effectively dissolve or stably disperse these viscous substances in water, and it cannot utilize the high temperature of the waste gas itself to achieve enhanced absorption. Second, although pure water or alkaline spraying can cool the high-temperature waste gas to a certain extent, under cooling conditions, the benzoin oxides and tar-like substances, which were originally in a gaseous or molten state, will rapidly condense into viscous substances. These substances easily adhere to the spray tower packing, nozzles, pipelines, and demister surfaces, accumulating continuously and forming a difficult-to-clean scale layer. Ultimately, this causes equipment blockage, increased system pressure drop, and a sharp decline in gas-liquid mass transfer efficiency, requiring frequent shutdowns for cleaning, seriously affecting the continuous and stable operation of the production line. Therefore, developing a water-based absorbent that is water-based, adaptable to spraying conditions, can utilize the temperature of high-temperature waste gas to enhance absorption, and remains stable, non-sticky, and non-precipitated after cooling has become an urgent technical problem to be solved in this field.

[0004] Therefore, a water-based anti-adhesion absorbent liquid for high-temperature waste gas spray treatment in coating and its preparation method are designed to provide a technical solution to the above-mentioned technical problems. Summary of the Invention

[0005] Therefore, it is necessary to provide a water-based anti-adhesion absorbent for high-temperature waste gas spraying treatment in coating processes and its preparation method to address the above-mentioned technical problems. This solution aims to solve the technical issues in existing high-temperature waste gas spraying treatments, such as the extremely low solubility and poor emulsification and dispersion of benzoin oxidation products, pyrolysis organic components, and lubricating oil cracking tar. Furthermore, during the cooling process after treatment, the benzoin oxides and tar-like substances, which were originally in a gaseous or molten state, rapidly condense into viscous substances that easily adhere to the surface of the spray tower packing, nozzles, pipelines, and demisters.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] The water-based anti-adhesion absorbent liquid for high-temperature exhaust gas spray treatment in coating processes is composed of the following components:

[0008] PEG600, Tween 80, triethanolamine, alkaline cosolvent, and deionized water.

[0009] Preferably, the absorbent liquid is composed of the following components by volume percentage:

[0010] PEG600: 13.4 vol%–22.0 vol%; Tween 80: 2.8 vol%–6.0 vol%; Triethanolamine: 0.9 vol%–2.5 vol%; Alkaline solubilizer; Deionized water: balance.

[0011] Preferably, the sum of the volume percentages of PEG600, Tween 80 and triethanolamine is 17.1 vol% to 30.5 vol%.

[0012] Preferably, the alkaline co-solvent is either anhydrous sodium carbonate or sodium bicarbonate.

[0013] Preferably, the alkaline co-solvent is anhydrous sodium carbonate, and the amount added is 0.5wt% to 1.2wt% (w / v).

[0014] Preferably, the alkaline co-solvent is sodium bicarbonate, and its addition amount is 0.8wt% to 1.8wt% (w / v).

[0015] The absorbent is used for spray treatment of high-temperature exhaust gases from coating processes containing benzoin oxides and / or high-temperature tar from lubricating oil.

[0016] Preferably, the spraying treatment method is water spraying.

[0017] The preparation method of water-based anti-adhesion absorbent for high-temperature exhaust gas spray treatment in coating processes includes the following steps:

[0018] S1: Mix PEG600, Tween 80 and triethanolamine by volume percentage, stir well, and obtain the first solution;

[0019] S2: Add an alkaline solubilizer and continue stirring until a uniform paste is formed to obtain the second solution;

[0020] S3: Add deionized water and stir in a water bath at 70℃~80℃ until the solid is completely dissolved. Adjust the volume to the required level to obtain the absorbent solution.

[0021] It is clear without a doubt that the technical problems to be solved by the present invention can be solved by the above-described technical solutions of the present invention.

[0022] Meanwhile, through the above technical solutions, the present invention has at least the following beneficial effects:

[0023] 1. The present invention provides a water-based anti-adhesion absorbent for high-temperature waste gas spray treatment in coating and its preparation method. The absorbent comes into contact with the high-temperature waste gas in the form of spray and uses its high-temperature environment to enhance the dissolution and absorption effect. After gradual cooling, the system can still maintain uniformity and stability, without precipitation, sticking, or adhering to the wall, thus inhibiting adhesion and blockage from the source.

[0024] 2. The preparation method of the absorbent liquid of the present invention is simple, mild, easy to operate, requires no complicated equipment, has high preparation efficiency, is suitable for large-scale on-site preparation, and makes the absorbent liquid particularly suitable for the high-temperature curing exhaust gas spray treatment system of benzoin powder coating, which can significantly improve the system's operational stability and reduce maintenance frequency and operating costs.

[0025] 3. This invention utilizes the temperature of the exhaust gas itself to enhance absorption, and achieves cooling of the high-temperature exhaust gas when in contact with it. During the spray cooling process, viscous pollutants are simultaneously solubilized, absorbed, and dispersed, without condensation, precipitation, or sticking to the wall, thus completely solving the problem of easy clogging after traditional water spray cooling. At the same time, it significantly reduces the frequency of downtime for cleaning, reduces the intensity of operation and maintenance, and extends the continuous operation cycle of the equipment.

[0026] 4. This invention can simultaneously solubilize benzoin oxide, absorb some pyrolyzed VOCs, and disperse lubricating oil tar substances, making it suitable for high-temperature complex waste gas conditions.

[0027] 5. The organic components of this invention are easily biodegradable, water-based, non-volatile, environmentally friendly, and have low reagent costs.

[0028] 6. Under simulated spraying conditions, 10 mL of the absorbent of this invention can disperse 0.5 g to 1.0 g of standard simulated pollutants, while the dispersion of pure water and sodium carbonate aqueous solution (1.2 wt%) under the same conditions is less than 0.05 g, which is more than 10 times higher. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart of the preparation method of the absorbent liquid of the present invention;

[0031] Figure 2 This is a comparison diagram of the dissolution state of the mixture of benzoin oxide and tar-like solids before and after the absorption liquid spraying treatment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0034] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] Example 1

[0037] The water-based anti-adhesion absorbent for high-temperature exhaust gas spray treatment in coating processes is composed of the following components by volume percentage: PEG600: 13.4 vol%–22.0 vol%; Tween 80: 2.8 vol%–6.0 vol%; triethanolamine: 0.9 vol%–2.5 vol%; alkaline co-solvent; deionized water: balance; wherein the sum of the volume percentages of PEG600, Tween 80, and triethanolamine is 17.1 vol%–30.5 vol%.

[0038] Preferably, the alkaline co-solvent is either anhydrous sodium carbonate or sodium bicarbonate. If the alkaline co-solvent is anhydrous sodium carbonate, its addition amount is 0.5wt% to 1.2wt% (w / v), and the pH of the system is approximately 10 after absorption. If the alkaline co-solvent is sodium bicarbonate, its addition amount is 0.8wt% to 1.8wt% (w / v), and the pH of the system is approximately 9 after absorption.

[0039] Preferably, the composition is PEG600 13.4 vol%, Tween 80 2.8 vol%, triethanolamine 0.9 vol%, anhydrous sodium carbonate 0.5 wt%, and deionized water to bring the total to 100%.

[0040] refer to Figure 1 Preparation method: PEG600, Tween 80 and triethanolamine are measured in sequence according to the ratio and placed in a beaker and mixed. The mixture is stirred at low speed until it is uniform and transparent. Anhydrous sodium carbonate solid is added and stirred continuously until it forms a uniform paste without particle agglomeration. Deionized water is added and the beaker is placed in a water bath at 70-80℃ and stirred for 2-3 minutes until the solid is completely dissolved. The volume is adjusted to obtain a stable absorbent solution with microemulsification and no precipitation.

[0041] Following the test method of shaking at 80℃ for 15 minutes: 10 mL of this absorbent can completely disperse / dissolve 0.5 g of standard simulated pollutant; under enhanced shaking conditions (200 shakes / min, 20 minutes), it can disperse to 1.0 g. The system is a yellow, homogeneous emulsion with no solid residue. After cooling to room temperature and standing for 2 hours, there is no stratification, precipitation, stickiness, or adhesion to the tube wall. After absorption, the pH of the system is approximately 10.

[0042] The absorbent of this invention achieves its core function through the synergistic effect of multiple components:

[0043] High-temperature enhanced absorption: When the absorbent comes into contact with high-temperature waste gas (usually 180-220°C), the high temperature of the waste gas itself creates a temperature environment conducive to dissolution, solubilization and dispersion, which significantly improves the treatment efficiency of benzoin oxides, pyrolytic VOCs and tar.

[0044] Stable after cooling: After the exhaust gas and spray liquid are gradually cooled to room temperature, the system remains uniform and stable, and the pollutants do not become sticky, do not easily agglomerate, and have no visible precipitates.

[0045] Anti-sticking throughout the entire process: From high-temperature contact to cooling down, it remains in a dissolved and dispersed state, without condensation, precipitation, or sticking to the wall.

[0046] In the absorbent of this invention, PEG600 serves as a polar co-solvent and viscosity modifier, enhancing the system's compatibility and solubilization capacity for polar organic components; Tween 80, as a nonionic emulsifier, provides stable emulsification and solubilization, effectively dispersing tar particles; triethanolamine combines solubilization, pH adjustment, interface modification, and auxiliary dispersion functions; alkaline co-solvent improves the surface polarity of tar, promoting stable tar dispersion, while also enhancing the dissolution efficiency of benzoin oxides; the aqueous phase provides the spraying medium, enabling gas-liquid contact and serving as a continuous phase to support solubilization and dispersion.

[0047] In this embodiment, the aqueous anti-adhesion absorbent is used in the treatment of high-temperature coating exhaust gas containing benzoin oxide and / or lubricating oil tar. Specifically, it is used by water spraying. A comparison of the solubility state of the benzoin oxide and tar-like solid mixture before and after the absorbent spraying treatment is provided for reference. Figure 2 .

[0048] Example 2 (Sodium carbonate system, higher concentration)

[0049] The water-based anti-adhesion absorbent for high-temperature exhaust gas spray treatment in coating processes comprises, by volume percentage: PEG600 22.0 vol%, Tween 80 6.0 vol%, triethanolamine 2.5 vol%, anhydrous sodium carbonate 1.2 wt%, and deionized water to bring the total to 100%. The preparation method is the same as in Example 1.

[0050] Test results: 10 mL of this absorbent solution completely dispersed 1.0 g of standard simulated pollutant within 10 minutes of shaking at 80℃, with a faster dissolution rate. The system was stable after cooling, without precipitation or stickiness. pH≈10.

[0051] Example 3 (Sodium bicarbonate system, lower concentration)

[0052] The water-based anti-adhesion absorbent for high-temperature exhaust gas spray treatment in coating processes comprises, by volume percentage: PEG600 13.4 vol%, Tween 80 2.8 vol%, triethanolamine 0.9 vol%, sodium bicarbonate 0.8 wt%, and deionized water to bring the total to 100%. The preparation method is the same as in Example 1.

[0053] Test results: 10 mL of this absorbent solution can completely disperse 0.5 g under shaking conditions at 80℃, and with enhanced shaking, it can disperse up to 1.0 g of standard simulated pollutant. The clarity of the solution at high temperatures is better than that of the sodium carbonate system, forming a uniform and transparent emulsion. After cooling, there is no precipitation, no stickiness, and no turbidity. After absorption, the pH of the system is approximately 9.

[0054] Example 4 (Sodium bicarbonate system, higher concentration)

[0055] The water-based anti-adhesion absorbent for high-temperature exhaust gas spray treatment in coating processes comprises, by volume percentage: PEG600 22.0 vol%, Tween 80 6.0 vol%, triethanolamine 2.5 vol%, sodium bicarbonate 1.8 wt%, and deionized water to bring the total to 100%. The preparation method is the same as in Example 1.

[0056] Test results: 10 mL of this absorbent can rapidly disperse 1.0 g of standard simulated pollutant, and it is stable after cooling, without becoming sticky or precipitating, demonstrating the best anti-clogging effect. pH≈9.

[0057] Example 5

[0058] Based on Examples 1 to 4 above, a method for preparing pollutants for testing is disclosed, comprising the following steps:

[0059] A viscous substance condensed in the pre-stage pipeline of the exhaust gas scrubbing tower of a typical air conditioner casing powder coating production line was collected. The substance was heated and stirred in an 80°C constant temperature water bath for 30 minutes to homogenize it. While still hot, it was filtered through a 100-mesh stainless steel sieve to remove large mechanical impurities and carbonized lumps. After the filtrate cooled to room temperature and solidified, it was dried in an 80°C vacuum drying oven for 12 hours to constant weight. After removal, it was ground and passed through a 200-mesh standard sieve to obtain a uniform yellowish-black powder, which was then sealed and stored for later use.

[0060] Thermogravimetric analysis (TGA) showed that the powder lost less than 5% of its weight below 200°C. GC-MS analysis revealed that its main organic components included benzoyl, benzoic acid (benzoin oxidation products), and C12-C24 alkanes, aromatics, and oxygen-containing polymers (high-temperature chain oil cracking products). All laboratory tests described below used standard simulants prepared from the same batch.

[0061] The testing apparatus and method are as follows:

[0062] A stoppered colorimetric tube and a constant-temperature shaker were used. 10 mL of the absorbent solution to be tested was placed in a 50 mL colorimetric tube, and 0.5 g (or 1.0 g) of a standard simulated pollutant was added. The tube was placed in a constant-temperature water bath shaker at 80℃±1℃ and shaken at a frequency of 150 times / minute for 15 minutes to simulate the turbulent mixing and contact process of the gas-liquid two-phase flow in the spray tower. After shaking, the colorimetric tube was removed, and the state of the system (solid residue, degree of emulsification, and adhesion to the walls) was observed. The colorimetric tube was then allowed to cool naturally to 25℃±1℃ and allowed to stand for 2 hours. The presence of precipitates, stratification, or adhesion to the walls was observed again.

[0063] Judgment criteria:

[0064] "Completely dissolved / dispersed": After high-temperature shaking, the system is a homogeneous emulsion or solution with no visible solid particles and no adhesion to the tube wall.

[0065] "Stable after cooling": After cooling and standing, there is no phase separation, no solid precipitation, and no sticky substance adhering to the pipe wall.

[0066] Comparative example (used to verify synergistic effects)

[0067] Comparative Example 1 (excluding triethanolamine): The water-based anti-adhesion absorbent for high-temperature exhaust gas spray treatment in coating processes, by volume percentage, is PEG600 13.4 vol%, Tween 80 2.8 vol%, anhydrous sodium carbonate 0.5 wt%, and deionized water as the balance. The preparation method is the same as in Example 1, but triethanolamine is omitted.

[0068] Comparative Example 2 (excluding Tween 80): The water-based anti-adhesion absorbent for high-temperature exhaust gas spray treatment in coating processes, by volume percentage, consisted of PEG600 13.4 vol%, triethanolamine 0.9 vol%, anhydrous sodium carbonate 0.5 wt%, and deionized water as the balance. The preparation method was the same as in Example 1, but Tween 80 was omitted.

[0069] Comparative Example 3 (alkaline solution only): 0.5 wt% aqueous solution of anhydrous sodium carbonate.

[0070] Comparative Example 4 (pure water): Deionized water.

[0071] Test Example 1 (The same oscillating simulated spray test was performed on Example 1 and Comparative Examples 1 to 4 above, and the results are summarized in Table 1)

[0072] Table 1: Comparison of performance of different absorbents (simulated spraying conditions)

[0073] sample State after shaking at 80℃ (1.0g contaminant / 10mL) Phenomenon after cooling (25℃, 2h) Pipe wall adhesion rating Example 1 Uniform emulsion, no solid residue No precipitation, no layering, and no adhesion to the wall. 1 Comparative Example 1 (without TEA) Partially dissolved, black particles are visible. A small amount of precipitate was observed, with slight adhesion to the tube wall. 3 Comparative Example 2 (without Tween 80) Poor emulsification, oil phase and water phase separation Obvious lumpy substances were observed to precipitate out, and the bottom was viscous. 4 Comparative Example 3 (Alkali Solution Only) Basically insoluble, contaminants adhere to the pipe wall. A large amount of black, sticky solid precipitated out and severely adhered to the wall. 5 Comparative Example 4 (pure water) Insoluble, pollutants clump together. A large amount of black, sticky solid precipitated out and severely adhered to the wall. 5

[0074] Note: Adhesion rating: 1-Not sticky at all; 2-Slightly sticky; 3-Significantly sticky; 4-Extremely sticky; 5-Irresistible viscous paste.

[0075] Results Analysis: Under simulated spray dynamic contact conditions, Example 1 of this invention exhibited excellent dispersion and stabilization capabilities against standard simulated pollutants, with no precipitation or adhesion after cooling. In contrast, the comparative example, lacking any organic component (triethanolamine or Tween 80), showed good dispersion and cooling stability.

[0076] Test Example 2

[0077] The absorbent prepared in Example 1 was used in an exhaust gas scrubbing tower of an air conditioner casing powder coating production line (processing air volume of 15000 m³ / h, exhaust gas temperature of 190–210°C, tower body made of stainless steel, filled with PP Pall ring packing). It was continuously operated for 30 days at a spray density of 2.5 m³ / (m²·h), during which no fresh absorbent was added (only recycled).

[0078] The results show that:

[0079] The initial pressure difference between the inlet and outlet of the spray tower was 320 Pa, and it increased to 335 Pa after 30 days, with an increase of less than 5%, and there was no obvious blockage.

[0080] Shutdown inspection: There is no obvious sticky scale layer on the surface of the packing inside the tower, only a layer of soft solid that is easy to wash off; the demister blades are clean; the nozzles are not clogged.

[0081] In contrast, when the production line previously used pure water spraying, it was forced to shut down for cleaning every 7 days on average due to the pressure drop doubling. During cleaning, a 3-5mm thick layer of black sludge adhered to the surface of the packing material, requiring high-pressure water gun washing and replacement of some of the packing material.

[0082] The above field data and laboratory simulated spray test results show a consistent trend, proving that the absorbent liquid of this invention can effectively solve the problems of viscous pollutant precipitation and equipment blockage during the cooling process of high-temperature exhaust gas.

[0083] The aqueous anti-adhesion absorbent in this embodiment can be used in the field of spray treatment of high-temperature waste gas generated by high-temperature curing process of powder coating, or in the field of water spraying, which can enhance dissolution and absorption by utilizing the temperature of the high-temperature waste gas itself, maintain system stability after cooling, inhibit the precipitation and stickiness of viscous substances, and prevent equipment blockage.

[0084] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A water-based anti-adhesion absorbent for high-temperature waste gas spraying treatment, characterized in that, The absorbent liquid is composed of the following components: PEG600, Tween 80, triethanolamine, alkaline cosolvent, and deionized water.

2. The water-based anti-adhesion absorbent liquid for high-temperature waste gas spraying treatment in coating as described in claim 1, characterized in that, The absorbent consists of the following components by volume percentage composition: PEG600: 13.4 vol%–22.0 vol%; Tween 80: 2.8 vol%–6.0 vol% Triethanolamine: 0.9 vol%–2.5 vol%; alkaline cosolvent; deionized water: balance.

3. The water-based anti-adhesion absorbent liquid for high-temperature waste gas spraying treatment in coating as described in claim 1, characterized in that, The total volume percentage of PEG600, Tween 80 and triethanolamine is 17.1 vol% to 30.5 vol%.

4. The water-based anti-adhesion absorbent liquid for high-temperature waste gas spraying treatment in coating as described in claim 1, characterized in that, The alkaline co-solvent is either anhydrous sodium carbonate or sodium bicarbonate.

5. The water-based anti-adhesion absorbent liquid for high-temperature waste gas spraying treatment in coating as described in claim 4, characterized in that, The alkaline co-solvent is anhydrous sodium carbonate, and the amount added is 0.5wt% to 1.2wt% (w / v).

6. The water-based anti-adhesion absorbent liquid for high-temperature waste gas spraying treatment in coating as described in claim 4, characterized in that, The alkaline co-solvent is sodium bicarbonate, and its addition amount is 0.8wt% to 1.8wt% (w / v).

7. The absorbent as described in any one of claims 1-6 is used for spray treatment of high-temperature exhaust gas from coating processes containing benzoin oxide and / or high-temperature tar from lubricating oil.

8. The application according to claim 7, characterized in that, The spray treatment method is water spraying.

9. A method for preparing an anti-adhesion absorbent liquid based on water for high-temperature waste gas spray treatment in coating processes, characterized in that, The steps are as follows: S1: Mix PEG600, Tween 80 and triethanolamine by volume percentage, stir well, and obtain the first solution; S2: Add an alkaline solubilizer and continue stirring until a uniform paste is formed to obtain the second solution; S3: Add deionized water and stir in a water bath at 70℃~80℃ until the solid is completely dissolved. Adjust the volume to the required level to obtain the absorbent solution.

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