Microporous molecular sieve impregnation liquid, desiccant wheel and preparation method of desiccant wheel

Abstract

The invention discloses a microporous molecular sieve impregnation liquid, a desiccant runner and a preparation method of the desiccant runner, and relates to the technical field of desiccant, the microporous molecular sieve comprises a molecular sieve, acidic silica sol, sodium carboxymethyl cellulose or / and chitosan and glycerin, the acidic silica sol and the sodium carboxymethyl cellulose or / and chitosan are used as binders, so that the system is neutral, and the desiccant runner can be used for preparing the desiccant runner. The molecular sieve is good in dispersity and stability, has a good moisture absorption effect and can be stably attached to the inorganic fiber paper, meanwhile, the inorganic fiber paper impregnated with the microporous molecular sieve impregnation liquid is not prone to breakage during corrugating and winding by means of the moisturizing effect of sodium carboxymethyl cellulose or / and chitosan and glycerin, and the yield is increased.

Description

Technical Field

[0001] This invention relates to the field of dehumidification technology, and in particular to a microporous molecular sieve impregnation solution, a dehumidification impeller, and a method for preparing the same. Background Technology

[0002] Rotary dehumidifiers are one of the most widely used solid adsorption dehumidification technologies in practical engineering. They utilize the excellent hydrophilicity of solid adsorbent materials to adsorb moisture from the air, thus reducing humidity. Among existing technologies, molecular sieves are a widely researched and applied solid adsorbent material due to their superior ability to absorb moisture even in low-humidity environments. Current technologies using molecular sieves in rotary dehumidifiers can achieve an outlet air dew point as low as -60℃, making them ideal for deep dehumidification at low dew points.

[0003] The existing dehumidifying rotor coating molecular sieve preparation process is as follows: first, the rotor blank is prepared through corrugation, winding, high-temperature calcination and other processes, then the molecular sieve is coated on its surface, and finally the molecular sieve is activated at high temperature. However, the existing dehumidifying rotor preparation process has the following defects: (1) The process is complicated and requires two high-temperature calcinations, which will damage the substrate and reduce the service life; (2) There are problems such as uneven molecular sieve coating, low adhesion, and easy shedding of powder, which seriously affect the service life of the rotor; (3) During the high-temperature calcination process, some of the binder carbonizes, which on the one hand reduces the adhesion of the molecular sieve to the fiber paper, and on the other hand increases the rigidity of the composite material, making it easy to break during corrugation and winding.

[0004] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a microporous molecular sieve impregnation solution, a dehumidifying wheel and its preparation method, in order to solve the defects of the existing dehumidifying wheel preparation method being complicated and the molecular sieve adhesion being unstable.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A microporous molecular sieve impregnation solution, comprising: molecular sieve, acidic silica sol, sodium carboxymethyl cellulose and / or chitosan, and glycerol.

[0008] The microporous molecular sieve impregnation solution comprises, by mass percentage: 30%–40% molecular sieve, 6%–8% acidic silica sol, 0.5%–1.5% sodium carboxymethyl cellulose and / or chitosan, 0.5%–2% glycerol, and the balance being water.

[0009] In the microporous molecular sieve impregnation solution, the mass ratio of the molecular sieve to the acidic silica sol is 5:1.

[0010] In the microporous molecular sieve impregnation solution, the mass ratio of chitosan to glycerol is 2:3.

[0011] In the microporous molecular sieve impregnation solution, the molecular sieve is at least one of 10X, 13X, 4A, and 5A.

[0012] In the microporous molecular sieve impregnation solution, the solid content of the molecular sieve is 30% to 40%.

[0013] In the microporous molecular sieve impregnation solution, the acidic silica sol has a pH of 2-5, a SiO2 content of 20%-40%, and a particle size of 8-40 nm.

[0014] A method for preparing a dehumidifying rotor, wherein the method includes the following preparation steps:

[0015] Preparation of molecular sieve impregnation solution: Take molecular sieve, acidic silica sol, sodium carboxymethyl cellulose and / or chitosan, glycerol, ethanol and water according to the ratio, stir and mix well to obtain molecular sieve impregnation solution;

[0016] Impregnation: The inorganic fiber paper is impregnated in the microporous molecular sieve impregnation solution as described above for 10-30 seconds, lifted and scraped flat, and then dried with hot air to obtain molecular sieve composite fiber paper.

[0017] Preparation of the rotating wheel: Part of the molecular sieve composite fiber paper is pressed into a corrugated shape to obtain corrugated paper, while the other part remains flat to obtain flat paper. The corrugated paper is glued onto the flat paper to obtain a composite substrate. The composite substrate is then wound to form a rotating wheel.

[0018] Drying and activation: The rotor is dried and activated at 120-200℃ to obtain a dehumidifying rotor.

[0019] In the preparation method of the dehumidifying rotor, the hot air drying temperature is 80-150℃ and the drying time is 5-10 min.

[0020] A dehumidifying impeller, wherein it is prepared by the preparation method described above.

[0021] Beneficial effects:

[0022] This invention provides a microporous molecular sieve impregnation solution. By using acidic silica sol and sodium carboxymethyl cellulose and / or chitosan as binders, the system can be made neutral, and the molecular sieve exhibits good dispersibility and stability. This allows the molecular sieve to adhere uniformly and firmly to inorganic fiber paper. The dehumidifying rotor prepared using this microporous molecular sieve impregnation solution has a good moisture absorption effect. At the same time, the moisturizing effect of sodium carboxymethyl cellulose and / or chitosan and glycerol makes the inorganic fiber paper impregnated with the microporous molecular sieve impregnation solution less prone to breakage during corrugation and winding, thus improving the yield.

[0023] A second aspect of this invention provides a method for preparing a dehumidifying rotor. This method uses a microporous molecular sieve impregnation solution as the impregnation liquid, and obtains the dehumidifying rotor through impregnation, drying, corrugating, lamination, and subsequent drying activation. During the preparation process, no high-temperature baking or activation is required, resulting in a molecular sieve composite fiber paper with strong toughness that does not break during corrugating and winding, significantly improving product quality. The dehumidifying rotor prepared by this method has good hygroscopicity, and the molecular sieve adheres firmly to the inorganic fiber paper, greatly extending its service life. Attached Figure Description

[0024] Figure 1 Scanning electron microscope image of the molecular sieve composite fiber paper provided by the present invention. Detailed Implementation

[0025] This invention provides a microporous molecular sieve impregnation solution, a dehumidifying impeller, and a method for preparing the same. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the following embodiments are provided for further detailed explanation. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0026] This invention provides a microporous molecular sieve impregnation solution for preparing a dehumidifying impeller. The microporous molecular sieve impregnation solution comprises: a molecular sieve, acidic silica sol, sodium carboxymethyl cellulose or chitosan, and glycerol. The molecular sieve serves as the adsorbent material, the acidic silica sol, sodium carboxymethyl cellulose, and chitosan act as binders, and the glycerol serves as a humectant. Through the combined action of these multiple components, the prepared microporous molecular sieve impregnation solution exhibits good stability. The acidic silica sol not only provides adhesion to attach the molecular sieve to the inorganic fiber paper, but also neutralizes the alkalinity of the molecular sieve, making the impregnating material neutral and preventing the impregnating solution from being too acidic or too alkaline, thus preventing corrosion of the equipment. The sodium carboxymethyl cellulose / chitosan provides adhesion and also ensures more uniform dispersion of the molecular sieve in the system, preventing sedimentation and stratification, thereby improving the system's stability. Furthermore, the sodium carboxymethyl cellulose / chitosan has a certain moisturizing effect. In particular, the combination of chitosan and glycerol allows the inorganic fiber paper coated with the microporous molecular impregnating solution to retain good toughness after drying, preventing breakage during corrugation and winding, and also preventing the microporous molecular sieve adhering to the surface of the inorganic fiber paper from falling off.

[0027] In a preferred embodiment, the microporous molecular sieve impregnation solution comprises, by mass percentage: 30%–40% molecular sieve, 6%–8% acidic silica sol, 0.5%–1.5% sodium carboxymethyl cellulose and / or chitosan, 0.5%–2% glycerol, and the balance being water. This microporous molecular sieve impregnation solution, with its neutral composition and good system stability, produces a desiccant wheel with superior hygroscopic properties.

[0028] The mass ratio of molecular sieve to acidic silica sol affects the hygroscopicity of the molecular sieve and its adhesion to inorganic fiber paper, as well as the stiffness of the inorganic fiber paper. A higher proportion of acidic silica sol results in stronger adhesion of the molecular sieve to the inorganic fiber paper and better paper stiffness, but reduces hygroscopicity. Therefore, in a preferred embodiment, the mass ratio of molecular sieve to acidic silica sol is (4-6):1, more preferably 5:1, which provides better dehumidification while ensuring stronger adhesion of the molecular sieve to the inorganic fiber paper.

[0029] Both chitosan and glycerol have hygroscopic properties, and experiments have shown that when used together, they provide good moisture retention, preventing the molecular sieve composite fiber paper from becoming brittle and maintaining its good toughness, thus avoiding breakage during corrugation and winding. However, chitosan and glycerol also increase the difficulty of dehydration by the dehumidifying rotor, leading to increased energy consumption during backflushing. Therefore, in some preferred embodiments, the amount and ratio of chitosan and glycerol added are adjusted to obtain better toughness and moisture retention. As one implementation method, when the total amount of chitosan and glycerol added is ≤3%, and their mass ratio is (1-2):(2-3), the toughness of the molecular sieve composite fiber paper can be improved while also ensuring high dehydration efficiency of the dehumidifying rotor during backflushing. Even better, when the total amount of chitosan and glycerol added is 2.5% and the mass ratio of the two is 2:3, the molecular sieve composite fiber paper can have better hygroscopicity and toughness, while also enabling the dehydration wheel to dehydrate faster.

[0030] In a preferred embodiment, the molecular sieve is at least one of 10X, 13X, 4A, and 5A, and the particle size of the molecular sieve is 2-6 μm. Using molecular sieves of the aforementioned type and particle size range results in better dispersibility and stability in the system, and a more uniform distribution on the inorganic fiber paper (see details). Figure 1 It has better moisture absorption.

[0031] In a preferred embodiment, the acidic silica sol has a pH of 2-5, a SiO2 content of 20%-40%, and a particle size of 8-40 nm. It has good adhesion, can firmly adhere to molecular sieves, and can be evenly distributed on inorganic fiber paper, improving stiffness and preventing the collapse of corrugated channels.

[0032] A second aspect of the present invention also provides a method for preparing a dehumidifying impeller, the method comprising the following preparation steps:

[0033] Impregnation: The inorganic fiber paper is impregnated in the microporous molecular sieve impregnation solution for 10-30 seconds. The inorganic fiber paper is made of glass fiber and ceramic fiber, which are good carriers. The paper is then lifted and scraped flat, and then dried with hot air at a temperature of 80-150℃ for 5-10 minutes to obtain molecular sieve composite fiber paper.

[0034] Preparation of the rotating wheel: Part of the molecular sieve composite fiber paper is pressed into a corrugated shape to obtain corrugated paper, while the other part remains flat to obtain flat paper. The corrugated paper is glued onto the flat paper to obtain a composite substrate. The composite substrate is then wound to form a rotating wheel.

[0035] Drying and activation: The rotor is dried and activated at 120-200℃ to obtain a dehumidifying rotor.

[0036] In the aforementioned preparation method, the dehumidifying rotor is prepared using the aforementioned microporous molecular sieve impregnation solution. During the preparation process, it can achieve good dehumidification effect without high-temperature calcination activation, which not only reduces energy consumption, but also, since no high-temperature calcination is required, it does not damage the molecular structure of inorganic fiber paper, sodium carboxymethyl cellulose, and chitosan. This allows sodium carboxymethyl cellulose and chitosan to maintain their viscosity while retaining their hygroscopicity, which not only improves the adhesion of the molecular sieve to the inorganic fiber paper, giving the dehumidifying rotor a longer service life, but also makes the dehumidifying rotor have a better moisture absorption effect. Furthermore, the sodium carboxymethyl cellulose / chitosan and glycerol can improve the toughness of the molecular sieve composite fiber paper, preventing it from breaking during corrugation and winding, and improving the quality of the finished product.

[0037] It should be noted that in this preparation method, the hot air drying temperature in the impregnation step and the drying activation temperature in the drying activation step need to be controlled. The temperature during hot air drying should be below 150℃ to quickly remove moisture while allowing chitosan and glycerol to retain some moisture, thus giving the molecular sieve composite fiber paper good toughness so that it does not break during corrugation and winding. During drying activation, the temperature is higher than that during hot air drying to ensure that the moisture in the inorganic fiber composite material is removed more completely, thereby giving the dehumidifying roller good hygroscopicity.

[0038] The third invention also provides a dehumidifying impeller, which is prepared by the method described above. It has a good dehumidification effect, and the molecular sieve in the dehumidifying impeller is firmly attached to the inorganic fiber paper, which can withstand high wind speeds and has a long service life.

[0039] To further illustrate the microporous molecular sieve impregnation solution, dehumidifying impeller, and preparation method provided by the present invention, the following embodiments are provided.

[0040] Example 1

[0041] A dehumidifying impeller is prepared by the following method:

[0042] Preparation of microporous molecular sieve impregnation solution: By mass percentage, take: 35% molecular sieve, 7% acidic silica sol (SiO2 content is 30%), 1.0% chitosan, 1.5% glycerol, and the balance is water. Stir and mix well to obtain the molecular sieve impregnation solution.

[0043] Impregnation: The inorganic fiber paper is impregnated in the microporous molecular sieve impregnation solution for 20 seconds; it is then lifted and scraped flat, and then dried by hot air at a temperature of 100℃ for 6 minutes to obtain molecular sieve composite fiber paper.

[0044] Preparation of the rotating wheel: Part of the molecular sieve composite fiber paper is pressed into a corrugated shape to obtain corrugated paper, while the other part remains flat to obtain flat paper. The corrugated paper is glued onto the flat paper to obtain a composite substrate. The composite substrate is then wound to form a rotating wheel.

[0045] Drying and activation: The rotor is dried and activated at 180℃ for 10 minutes to obtain a dehumidifying rotor.

[0046] Example 2

[0047] A dehumidifying impeller is prepared by the following method:

[0048] Preparation of microporous molecular sieve impregnation solution: By mass percentage, take: 30% molecular sieve, 8% acidic silica sol (SiO2 content is 20%), 1.0% sodium carboxymethyl cellulose, 0.5% chitosan, 2% glycerol, and the balance is water. Stir and mix well to obtain the molecular sieve impregnation solution.

[0049] Impregnation: The inorganic fiber paper is impregnated in the microporous molecular sieve impregnation solution for 30 seconds; it is then lifted and scraped flat, and then dried by hot air at a temperature of 150℃ for 5 minutes to obtain molecular sieve composite fiber paper.

[0050] Preparation of the rotating wheel: Part of the molecular sieve composite fiber paper is pressed into a corrugated shape to obtain corrugated paper, while the other part remains flat to obtain flat paper. The corrugated paper is glued onto the flat paper to obtain a composite substrate. The composite substrate is then wound to form a rotating wheel.

[0051] Drying and activation: The rotor is dried and activated at 120℃ for 20 minutes to obtain a dehumidifying rotor.

[0052] Example 3

[0053] A dehumidifying impeller is prepared by the following method:

[0054] Preparation of microporous molecular sieve impregnation solution: By mass percentage, take: 40% molecular sieve, 6% acidic silica sol (SiO2 content is 40%), 0.5% chitosan, 0.5% glycerol, and the balance is water. Stir and mix well to obtain molecular sieve impregnation solution.

[0055] Impregnation: The inorganic fiber paper is impregnated in the microporous molecular sieve impregnation solution for 10 seconds. The inorganic fiber paper is made of glass fiber and ceramic fiber, which are good carriers. The paper is then lifted and flattened, and then dried with hot air at a temperature of 80°C for 10 minutes to obtain molecular sieve composite fiber paper.

[0056] Preparation of the rotating wheel: Part of the molecular sieve composite fiber paper is pressed into a corrugated shape to obtain corrugated paper, while the other part remains flat to obtain flat paper. The corrugated paper is glued onto the flat paper to obtain a composite substrate. The composite substrate is then wound to form a rotating wheel.

[0057] Drying and activation: The rotor is dried and activated at 200℃ for 5 minutes to obtain a dehumidifying rotor.

[0058] Example 4

[0059] A dehumidifying impeller is prepared by the following method:

[0060] Preparation of microporous molecular sieve impregnation solution: By mass percentage, take: 32% molecular sieve, 8% acidic silica sol (SiO2 content is 22%), 0.5% sodium carboxymethyl cellulose, 0.8% chitosan, 1.6% glycerol, and the balance is water. Stir and mix well to obtain the molecular sieve impregnation solution.

[0061] Impregnation: The inorganic fiber paper is impregnated in the microporous molecular sieve impregnation solution for 20 seconds; it is then lifted and scraped flat, and then dried by hot air at a temperature of 120℃ for 8 minutes to obtain molecular sieve composite fiber paper.

[0062] Preparation of the rotating wheel: Part of the molecular sieve composite fiber paper is pressed into a corrugated shape to obtain corrugated paper, while the other part remains flat to obtain flat paper. The corrugated paper is glued onto the flat paper to obtain a composite substrate. The composite substrate is then wound to form a rotating wheel.

[0063] Drying and activation: The rotor is dried and activated at 160℃ to obtain a dehumidifying rotor.

[0064] Example 5

[0065] A dehumidifying impeller is prepared by the following method:

[0066] Preparation of microporous molecular sieve impregnation solution: By mass percentage, take: 38% molecular sieve, 7% acidic silica sol (SiO2 content is 35%), 1.2% sodium carboxymethyl cellulose, 1.2% glycerol, and the balance is water. Stir and mix well to obtain the molecular sieve impregnation solution.

[0067] Impregnation: The inorganic fiber paper is impregnated in the microporous molecular sieve impregnation solution for 25 seconds. The inorganic fiber paper is made of glass fiber and ceramic fiber, which are good carriers. The paper is then lifted and flattened, and then dried with hot air at a temperature of 130°C for 8 minutes to obtain molecular sieve composite fiber paper.

[0068] Preparation of the rotating wheel: Part of the molecular sieve composite fiber paper is pressed into a corrugated shape to obtain corrugated paper, while the other part remains flat to obtain flat paper. The corrugated paper is glued onto the flat paper to obtain a composite substrate. The composite substrate is then wound to form a rotating wheel.

[0069] Drying and activation: The rotor is dried and activated at 180℃ to obtain a dehumidifying rotor.

[0070] Comparative Example 1

[0071] A dehumidifying impeller is prepared in a manner that is basically the same as in Example 1, except that chitosan and glycerin are not added.

[0072] Comparative Example 2

[0073] A dehumidifying impeller is prepared in a manner that is basically the same as in Example 1, except that glycerin is not added.

[0074] Comparative Example 3

[0075] A dehumidifying rotor is prepared in a manner that is basically the same as in Example 1, except that the acidic silica sol is replaced with an alkaline silica sol.

[0076] Comparative Example 4

[0077] A dehumidifying rotor is prepared in a manner that is basically the same as in Example 1, except that the drying and activation temperature is 400°C.

[0078] It should be noted that the molecular sieves used in Examples 1-5 and Comparative Examples 1-5 all have a pore size range of 2-6 μm, the acidic sodium silicate has a particle size of 8-40 nm, and the molecular sieves used are all of type 13X.

[0079] Performance testing

[0080] The dehumidification performance and adhesion strength of the molecular sieves in Examples 1-5 and Comparative Examples 1-5 were tested. Simultaneously, the breakage or detachment of the molecular sieve composite fiber paper was observed during corrugation and winding. The dehumidification performance was tested by cutting the prepared composite substrate into 10cm x 10cm pieces and placing them in a constant temperature and humidity chamber at 25℃ and 70% humidity to test its hygroscopicity. The adhesion strength of the molecular sieves was tested by blowing the corrugated holes with a high-pressure air gun at a wind speed of 40m / s and observing whether powder shedding occurred (the wind speed during the operation of the rotary dehumidifier is generally 3-5m / s). Specific test results are shown in Table 1.

[0081] Table 1 Performance Test Results

[0082]

[0083]

[0084] As shown in Table 1, the saturated moisture absorption rate of Examples 1-5 is 15%-20%, the molecular sieve is firmly attached, and no powder will fall off when blown at a high wind speed. At the same time, the molecular sieve composite fiber paper has good toughness when corrugated and will not break.

[0085] The difference between Comparative Example 1 and Example 1 is that chitosan and glycerol were not added, but its saturated moisture absorption rate decreased to 10%, and the molecular sieve adhesion strength decreased. It was easy to lose powder under high wind speed blowing, and it was easy to break during corrugation. It can be seen that chitosan and glycerol have an impact on the saturated moisture absorption rate of the dehumidifying wheel, the adhesion strength of the molecular sieve, and the toughness of the molecular sieve composite fiber paper.

[0086] Comparative Example 2, due to the lack of glycerin, resulted in insufficient toughness of the molecular sieve composite fiber paper, making it prone to breakage during corrugation.

[0087] The use of alkaline silica sol in Comparative Example 3 reduces the saturated moisture absorption rate of the material and decreases the adhesion strength of the molecular sieve on the inorganic fiber paper, resulting in powder shedding at higher wind speeds.

[0088] Comparative Example 4, due to the use of a higher drying and activation temperature, resulted in the carbonization of chitosan and glycerol, which reduced the adhesion strength of the molecular sieve on the inorganic fiber paper, making it prone to powdering. Furthermore, the toughness of the molecular sieve composite fiber paper decreased, making it easy to break during corrugation.

[0089] In the description of the embodiments of the present invention, it should be noted that the terms "inner," "outer," "upper," "lower," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0090] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0091] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A microporous molecular sieve impregnation solution, characterized in that, It includes: Molecular sieves, acidic silica sol, sodium carboxymethyl cellulose and / or chitosan, glycerol.

2. The microporous molecular sieve impregnation solution according to claim 1, characterized in that, The microporous molecular sieve impregnation solution comprises, by mass percentage: 30%–40% molecular sieve, 6%–8% acidic silica sol, 0.5%–1.5% sodium carboxymethyl cellulose and / or chitosan, 0.5%–2% glycerol, and the balance being water.

3. The microporous molecular sieve impregnation solution according to claim 2, characterized in that, The mass ratio of the molecular sieve to the acidic silica sol is 5:

1.

4. The microporous molecular sieve impregnation solution according to claim 2, characterized in that, The mass ratio of chitosan to glycerol is 2:

3.

5. The microporous molecular sieve impregnation solution according to claim 2, characterized in that, The molecular sieve is at least one of 10X, 13X, 4A, and 5A.

6. The microporous molecular sieve impregnation solution according to claim 1, characterized in that, The solid content of the molecular sieve is 30% to 40%.

7. The microporous molecular sieve impregnation solution according to claim 1, characterized in that, The acidic silica sol has a pH of 2-5, a SiO2 content of 20%-40%, and a particle size of 8-40 nm.

8. A method for preparing a dehumidifying impeller, characterized in that, The method includes the following preparation steps: impregnation: the inorganic fiber paper is impregnated in the microporous molecular sieve impregnation solution as described in any one of claims 1-7 for 10-30 seconds, lifted and scraped flat, and then dried with hot air to obtain molecular sieve composite fiber paper; Preparation of the rotating wheel: Part of the molecular sieve composite fiber paper is pressed into a corrugated shape to obtain corrugated paper, while the other part remains flat to obtain flat paper. The corrugated paper is glued onto the flat paper to obtain a composite substrate. The composite substrate is then wound to form a rotating wheel. Drying and activation: The rotor is dried and activated at 120-200℃ to obtain a dehumidifying rotor.

9. The method for preparing the dehumidifying impeller according to claim 8, characterized in that, The hot air drying temperature is 80–150°C, and the drying time is 5–10 minutes.

10. A dehumidifying impeller, characterized in that, It is prepared by the preparation method described in claim 8 or 9.

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