Molecular sieve coating for runner of dehumidifier and preparation method of molecular sieve coating

Abstract

The invention relates to the technical field of coatings, in particular to a molecular sieve coating for a dehumidifier rotating wheel and a preparation method of the molecular sieve coating. The coating is prepared from a water-soluble polymer solution, molecular sieve raw powder, nano silicon dioxide, a water-based additive and water. The invention further discloses a preparation method of the molecular sieve coating for the dehumidifier rotating wheel. Through the combined action of the film forming matter, the molecular sieve raw powder, the nano silicon dioxide and the auxiliary agent, a coating with excellent hygroscopicity is formed, and the coating can be coated on the aluminum foil of the rotating wheel of the dehumidifier, so that the surface of the rotating wheel has excellent hygroscopicity, and the dehumidification effect of the dehumidifier is improved.

Description

Technical Field

[0001] The invention relates to a molecular sieve coating for a dehumidifier rotor and a preparation method thereof. Background Art

[0002] The relative humidity in the air has an important impact on the living environment, industrial production and the operation of scientific research equipment. Especially in areas with high air humidity such as Guangdong in my country, how to ensure the required low humidity environment, improve living conditions, develop production technology, ensure production processes, and improve product quality are of great significance. The core component of the rotary dehumidifier, the rotary wheel, is equipped with a dehumidification coating. Its purpose is to absorb moisture in the air through a coating with a hygroscopic function, thereby achieving a dehumidification effect. Therefore, the development and application of dehumidification coatings have broad market value.

[0003] The patent with publication number CN105086687B discloses a molecular sieve layer coated aluminum foil and its preparation method, wherein the coating comprises molecular sieve and acrylic resin. Since the paint film formed after the acrylic resin is formed is relatively dense, the gaps of the molecular sieve will be shielded and blocked by the acrylic resin, thereby causing the hygroscopic performance of the coating to decrease. In addition, the selected molecular sieve must be activated to offset some of the side effects caused by the acrylic resin. Summary of the invention

[0004] The object of the present invention is to provide a molecular sieve coating for a dehumidifier rotor and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] To solve the above technical problems, the technical solution provided by the present invention is: a molecular sieve coating for a dehumidifier wheel, composed of the following raw materials: 20 to 50 parts of a water-soluble polymer solution, 25 to 50 parts of molecular sieve raw powder, 1 to 5 parts of nano-silicon dioxide, 1 to 5 parts of an aqueous additive, and 20 to 25 parts of water.

[0006] Preferably, the molecular weight of the water-soluble polymer solution is 7000-30000, and it is one or two of PVA, EVA and PEG.

[0007] Preferably, the molecular sieve raw powder is one or both of 4A molecular sieve raw powder and 3A molecular sieve raw powder, and the chemical formula of 4A molecular sieve raw powder is: Na 2 O.Al 2 O 3 ·2SiO 2 9 / 2H 2 O, 3A molecular sieve raw powder chemical formula: 2 / 3K 2 O·1 / 3Na 2 O.Al 2 O 3 ·2SiO2 9 / 2H 2 O.

[0008] Preferably, the nano-silicon dioxide has a particle size of 5-7 um and an oil absorption value of not less than 300.

[0009] Preferably, the aqueous auxiliary agent is a wetting defoaming agent.

[0010] Furthermore, the wetting defoaming agent is an acrylate resin.

[0011] A method for preparing a molecular sieve coating for a dehumidifier rotor comprises the following steps: adding water-soluble polymer particles to water at 90-95 DEG C, stirring for 1-2 hours with a dispersing machine to prepare a water-soluble polymer solution with a solid content of 2%-8%, releasing and cooling naturally to room temperature, and using the water-soluble polymer solution as standby; adding 20-50 parts of the water-soluble polymer solution into a container, placing the container in a dispersing machine for stirring, the dispersing machine rotating speed is 300-500 r / min, and sequentially adding 25-50 parts of molecular sieve raw powder, 1-5 parts of nano silicon dioxide, and 1-5 parts of water-based additives in a stirring state; then increasing the dispersing machine rotating speed to 1000-1500 r / min, dispersing at high speed for 0.5-1h, then reducing the dispersing machine rotating speed to 500-700 r / min, adding 20-25 parts of water; stirring for 10-20 minutes, and obtaining a finished molecular sieve coating.

[0012] The advantages of the present invention are as follows: the present invention adopts water-soluble macromolecules as the main film-forming material to form a loose microstructure that will not cover the pores of the original molecular sieve powder, thereby ensuring the hygroscopic effect of the original molecular sieve powder. The technical shortcoming of the prior art that activated molecular sieves must be used to achieve good hygroscopicity is improved. At the same time, a small amount of nano-silicon dioxide is added to fill the large pores in the coating, so that the capillary structure of the coating is more uniform, the surface hygroscopic effect is more uniform, and the strength of the coating is also improved. The solution provided by the present invention has lower cost and better hygroscopicity, and is more suitable for industrial production. DETAILED DESCRIPTION

[0013] For the purpose of the following detailed description, it should be understood that the present invention may adopt various alternative changes and step sequences, unless expressly specified to the contrary. In addition, except in any operating examples, or otherwise indicated, all numbers representing the amount of ingredients used in the specification and claims should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise indicated, the numerical parameters set forth in the following specification and the attached claims are approximate values ​​that vary according to the desired performance to be obtained by the present invention. At least it is not intended to limit the application of the doctrine of equivalents to the scope of the claims, and each numerical parameter should at least be interpreted according to the number of reported significant figures and by applying ordinary rounding techniques.

[0014] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0015] In addition, it should be understood that any numerical range described herein is intended to include all subranges subsumed therein. For example, a range of "1 to 10" is intended to include all subranges between (and including) the stated minimum value of 1 and the stated maximum value of 10, i.e., having a minimum value equal to or greater than 1 and a maximum value equal to or less than 10.

[0016] Example 1

[0017] A molecular sieve coating for a dehumidifier rotor, comprising the following raw materials:

[0018]

[0019] A method for preparing a molecular sieve coating for a dehumidifier rotor comprises the following steps: heating 18.4 kg of water to 95° C., stirring at a speed of 300-500 r / min on a dispersing machine, adding 1.6 kg of Kuraray EVA RS-1113 particles, and then maintaining 90° C.-95° C. and stirring for 1 hour until the Kuraray EVA RS-1113 particles are completely dissolved. 20 kg of Kuraray EVA RS-1113 aqueous solution is obtained, and the solution is placed to cool to room temperature. 20 kg of Kuraray EVA RS-1113 aqueous solution is added to a pull cylinder, and the solution is placed on a dispersing machine and stirred at a speed of 300-500 r / min, and 25 kg of 4A molecular sieve raw powder, 25 kg of 3A molecular sieve raw powder, 5 kg of nano silicon dioxide, and 5 kg of aqueous wetting defoaming agent are added. Then the speed is increased to 1000 r / min-1500 r / min, and high-speed dispersion is performed for 1 hour. Reduce the speed of the disperser to 500-700r / min, add 20kg of water, and continue stirring for 15 minutes until the coating is uniform. Filter with a 400-mesh filter cloth to obtain the finished molecular sieve coating.

[0020] Example 2

[0021] A molecular sieve coating for a dehumidifier rotor, comprising the following raw materials:

[0022]

[0023]

[0024] A method for preparing a molecular sieve coating for a dehumidifier rotor comprises the following steps: heating 47.5 kg of water to 95° C., stirring at a speed of 300-500 r / min on a dispersing machine, adding 2.5 kg of PEG20000 particles, and then maintaining 90° C.-95° C. and stirring for 1 hour until the PEG20000 particles are completely dissolved. Obtaining 50 kg of PEG20000 aqueous solution, placing and cooling to room temperature. Adding 50 kg of PEG20000 aqueous solution to a pull cylinder, placing on a dispersing machine and stirring at a speed of 300-500 r / min, adding 15 kg of 4A molecular sieve raw powder, 10 kg of 3A molecular sieve raw powder, 3 kg of nano silicon dioxide, and 1 kg of aqueous wetting defoaming agent. Then increasing the speed to 1000 r / min-1500 r / min, and dispersing at high speed for 1 hour. Reducing the speed of the dispersing machine to 500-700 r / min, adding 21 kg of water, and continuing to stir for 15 minutes after adding until the coating is uniform. Filter with 400 mesh filter cloth to obtain the finished molecular sieve coating.

[0025] Example 3

[0026] A molecular sieve coating for a dehumidifier rotor, comprising the following raw materials:

[0027]

[0028] A method for preparing a molecular sieve coating for a dehumidifier rotor comprises the following steps: heating 27.8 kg of water to 95° C., stirring at a speed of 300-500 r / min on a dispersing machine, adding 2.2 kg of PVA1788 particles, and then maintaining 90° C.-95° C. and stirring for 1 hour until the PVA1788 particles are completely dissolved. Obtaining 30 kg of PVA1788 aqueous solution, placing and cooling to room temperature. Adding 30 kg of PVA1788 aqueous solution to a pull cylinder, placing on a dispersing machine and stirring at a speed of 300-500 r / min, adding 35 kg of 4A molecular sieve raw powder, 8 kg of 3A molecular sieve raw powder, 2 kg of nano silicon dioxide, and 2 kg of aqueous wetting defoaming agent. Then increasing the speed to 1000 r / min-1500 r / min, and dispersing at high speed for 1 hour. Reducing the speed of the dispersing machine to 500-700 r / min, adding 23 kg of water, and continuing to stir for 15 minutes after adding until the coating is uniform. Filter with 400 mesh filter cloth to obtain the finished molecular sieve coating.

[0029] The test data of the molecular sieve coating of Example 3 are as follows:

[0030]

[0031]

[0032] The present invention adopts a water-soluble macromolecular polymer as the main film-forming material. On the premise of ensuring film-forming property, it has a loose microstructure to form capillary channels, which can better absorb moisture. 4A or 3A molecular sieve raw powder has good water absorption and can absorb moisture in the air. Due to the loose microstructure of the main film-forming material, the pores of the molecular sieve raw powder will not be covered, so the hygroscopicity of the molecular sieve raw powder can be fully utilized. A small amount of nano-silicon dioxide particles can be evenly filled in the large pores of the coating, so that the pores formed inside the coating are more uniform, thereby making the moisture absorption effect on the surface more uniform; at the same time, the filling of nano-silicon dioxide also makes the coating stronger and not easily destroyed by external forces. Adding an appropriate amount of water-based additives to the coating mainly plays the role of wetting the substrate and defoaming, so that the coating has good construction performance.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A molecular sieve coating for a dehumidifier rotor, characterized in that: The invention is composed of the following raw materials: 20 to 50 parts of water-soluble polymer solution, 25 to 50 parts of molecular sieve raw powder, 1 to 5 parts of nano silicon dioxide, 1 to 5 parts of water-based auxiliary agent and 20 to 25 parts of water.

2. The molecular sieve coating for a dehumidifier rotor according to claim 1, characterized in that: The molecular weight of the water-soluble polymer solution is 7000-30000, and the water-soluble polymer solution is one or two of PVA, EVA and PEG.

3. The molecular sieve coating for a dehumidifier wheel according to claim 1, characterized in that: The molecular sieve raw powder is one or both of 4A molecular sieve raw powder and 3A molecular sieve raw powder. The chemical formula of 4A molecular sieve raw powder is: Na2O·Al2O3·2SiO2·9 / 2H2O, and the chemical formula of 3A molecular sieve raw powder is: 2 / 3K2O·1 / 3Na2O·Al2O3·2SiO2·9 / 2H2O.

4. The molecular sieve coating for a dehumidifier rotor according to claim 1, characterized in that: The nano silicon dioxide has a particle size of 5-7 um and an oil absorption value of not less than 300.

5. The molecular sieve coating for a dehumidifier rotor according to claim 1, characterized in that: The aqueous auxiliary agent is a wetting and defoaming agent.

6. The molecular sieve coating for a dehumidifier rotor according to claim 5, characterized in that: The wetting and defoaming agent is acrylate resin.

7. A method for preparing a molecular sieve coating for a dehumidifier rotor according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: adding water-soluble polymer particles into water at 90-95 DEG C, stirring for 1-2 hours with a dispersing machine to prepare a water-soluble polymer solution with a solid content of 2%-8%, discharging and cooling naturally to room temperature, and using the water-soluble polymer solution as standby; adding 20-50 parts of the water-soluble polymer solution into a container, placing the container in a dispersing machine for stirring, the dispersing machine rotating speed is 300-500r / min, and sequentially adding 25-50 parts of molecular sieve original powder, 1-5 parts of nano silicon dioxide, and 1-5 parts of water-based additives in a stirring state; then increasing the dispersing machine rotating speed to 1000-1500r / min, dispersing at high speed for 0.5-1h, then reducing the dispersing machine rotating speed to 500-700r / min, adding 20-25 parts of water; stirring for 10-20 minutes, and obtaining a finished molecular sieve coating.

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