An anti-icing and slippage coating for a hopper in an ice jet cleaning equipment and its preparation method

Abstract

This invention provides an anti-icing and slip-removing coating for the hopper of an ice jet cleaning equipment and its preparation method, belonging to the field of material surface treatment technology. The preparation method includes: preparing an anti-icing and slip-removing coating by mixing polysilazane, a low surface energy modifying component, and an organic solvent in a certain proportion; coating treatment by applying the anti-icing and slip-removing coating to a solid surface using methods such as dip coating, spraying, spin coating, brush coating, or roller coating; and coating curing treatment by placing the sample coated with the anti-icing and slip-removing coating at room temperature or heating it in an oven to complete the coating curing process, thus obtaining the anti-icing and slip-removing coating surface. The anti-icing and slip-removing coating obtained by this invention has a simple preparation process, a wide range of applicable substrate materials, and excellent mechanical stability, durability, and transparency.

Description

Technical Field

[0001] This invention belongs to the field of material surface treatment technology, and relates to an anti-icing and slippage coating for the hopper of an ice jet cleaning equipment and its preparation method. Background Technology

[0002] Ice jet cleaning equipment is widely used for cleaning parts in aerospace, automotive, and other industries due to its low cost, environmental friendliness, and high cleaning efficiency. However, because ice jet cleaning equipment often uses dry ice at -78.5 degrees Celsius or water ice at tens of degrees below zero as raw material, the excessively low temperature ice particles often adhere and accumulate at the bottom of the hopper, clogging the ice inlet of the dispenser and preventing the ice particles from being ejected, leading to downtime for maintenance. Currently, the hopper material is mainly stainless steel plate. Due to the high surface energy of stainless steel, it is very prone to ice accumulation, resulting in extremely serious ice adhesion. Therefore, it is necessary to develop a coating that can reduce the adhesion of ice to the stainless steel surface, thereby achieving an anti-icing effect.

[0003] Slip coatings have been extensively studied due to their low adhesion to ice. For example, patent number ZL202111002123.5 discloses a coating for preparing super-slip coatings and its application. It involves mixing and stirring nano-silica particles, silicone oil / perfluoropolyether silicone oil / DuPont Krytox, silane coupling agent, ethyl acetate / acetone, etc., and then coating and curing it on the substrate surface to form a slip coating. However, the preparation process of this coating requires the addition of inert lubricants such as silicone oil, which prevents the coating from being fully cured and leaves an oil film on the surface, affecting its application in real life. Furthermore, it requires the separate preparation of liquid A and liquid B, resulting in low production efficiency. Literature (Langmuir 2020, 36, 15403-15409) reports the preparation of slip surfaces on epoxy resin by femtosecond laser etching and modification with perfluorodecyltrimethoxysilane, followed by lubricant infusion. However, the laser preparation process is costly, and the fluorosilane modification process has poor scalability, mostly applicable only to small-volume samples, limiting its large-scale industrial application. Literature (Langmuir 2020, 36, 14145-14154) reports the preparation of slip surfaces by depositing multilayer polyelectrolytes and nanoparticles, modifying with fluorosilane, and spin-coating with lubricant. However, this preparation process involves many steps and has low production efficiency. Literature (Chemical Engineering Journal 2021, 416, 127809) reports the construction of nano-rough structures using SiO2, tetraethoxysilane, ethanol, NH4OH, etc., via a sol-gel method, followed by lubricant infusion to obtain slip surfaces. However, the sol-gel process is time-consuming and has low production efficiency. Patent CN112457738A discloses a method of mixing boron-modified phenolic resin liquid binder with lubricating powder to form a coating, which is then uniformly brushed onto the substrate surface and sintered at a high temperature of over 1000℃ to obtain a solid sliding surface. However, the high-temperature sintering process has high energy consumption and poor scalability, making it difficult to promote its application in practice.

[0004] In summary, existing slip coatings have drawbacks such as complex preparation processes, high preparation costs, limited substrate materials, and easy depletion of lubricants, making them difficult to apply to the silos of ice jet cleaning equipment. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention proposes an anti-icing and slippage coating for silos in ice jet cleaning equipment, which has a simple preparation process, low preparation cost, requires no lubricant, and can be applied to the coating, as well as its preparation method.

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

[0007] A method for preparing an anti-icing and anti-slip coating for a hopper in an ice jet cleaning device includes the following steps:

[0008] Step (1) Coating preparation: At room temperature, add 0.1 to 0.2 parts by weight of low surface energy modifier and 5 to 8 parts by weight of polysilazane to 10 to 20 parts by weight of organic solvent and stir to obtain coating, wherein the stirring time is not less than 5 minutes.

[0009] Furthermore, in step (1): the low surface energy modifier is perfluorooctyltrichlorosilane, perfluorodecyltrimethoxysilane, perfluorohexyltrichlorosilane, etc.; the polysilazane is an organopolysilazane or a perhydropolysilazane; the organic solvent is acetone, ethyl acetate, butyl acetate, etc.

[0010] Step (2) Coating treatment: The coating obtained in step (1) is applied to the substrate through a one-step dip coating process. After coating, the substrate is tilted and left to stand, so that a uniform coating is formed on the solid surface.

[0011] Furthermore, in step (2): the tilt angle is 0° to 90°. The coating method includes, but is not limited to, dip coating, spray coating, spin coating, brush coating, and roller coating. The substrate includes, but is not limited to, stainless steel, aluminum alloy, canvas, glass, silicon, pine wood, and carbon fiber.

[0012] Step (3) Curing treatment: Place the coating obtained in step (2) in a room temperature air atmosphere for 24 hours to cure, and an anti-icing and slip coating can be obtained.

[0013] An anti-icing and slippage coating for a hopper in an ice jet cleaning equipment is prepared using the method described above. The polysilazane resin is a material with excellent heat resistance, wear resistance, and chemical resistance, capable of firmly anchoring to the substrate through chemical bonds, providing a stable protective layer. The perfluorinated groups (-CF3 or -CF2-) in the low surface energy modifier are highly hydrophobic groups composed of carbon and fluorine, with a surface energy of approximately 18 mJ / m². 2 Metals generally have higher surface energy; for example, the surface energy of iron is approximately 2000 mJ / m². 2 By combining the advantages of polysilazane and low surface energy modifiers, the proposed coating exhibits excellent chemical stability, significantly reduces the surface energy of the metal, and thus reduces the interaction force between ice and the coating surface, effectively reducing ice adhesion.

[0014] The innovation of this invention lies in the use of a novel low surface energy modifier combined with polysilazane to achieve uniform coating on the substrate through a simple dip-coating process. This avoids the use of lubricants in traditional coatings, thereby simplifying the preparation process and reducing costs. Furthermore, the proposed coating preparation method does not require high-temperature sintering or complex and expensive preparation processes, making it easy to scale up for mass production and possessing high industrial application potential.

[0015] Compared with existing slip coatings, the present invention has the following advantages:

[0016] (1) The coating preparation process only involves room temperature blending of two liquids. Since the Si-H bond in polysilazane and the methoxy or chlorine group in the low surface energy modifier can undergo polycondensation reaction at room temperature, there is no need for expensive industrial equipment.

[0017] (2) The preparation process is simple and can be carried out indoors and outdoors using coating methods such as dip coating, spray coating, spin coating, brush coating, and roller coating, making it easy to achieve large-area preparation.

[0018] (3) Because the polysilazane in the coating can be stably anchored to a variety of substrate materials, the coating has a wide range of substrate materials and can be applied to substrate materials such as stainless steel, aluminum alloy, glass, silicon wafer, wood, and carbon fiber.

[0019] (4) Because the polysilazane in the coating has a hard and smooth surface after curing, and the CF bond in the low surface energy modifier has extremely high stability, the prepared coating has good mechanical stability and durability.

[0020] (5) Since the polysilazane in the coating is a transparent hard material after curing, and both it and the low surface energy modifier are transparent to visible light, the prepared coating has excellent light transmittance, which is 100% in the entire visible light wavelength range. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the preparation process of the anti-icing and slippage coating of the present invention.

[0022] Figure 2 Optical photographs of glass coated with an anti-icing and anti-slip coating and its ultraviolet-visible transmission spectrum.

[0023] Figure 3 The sliding process of a 90 μL water droplet on an anti-icing slip coating tilted at 25°.

[0024] Figure 4 The adhesion strength of ice buildup on ordinary stainless steel surfaces and anti-icing slip coating surfaces. Detailed Implementation Plan

[0025] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

[0026] Example 1:

[0027] 0.1 g of perfluorooctyltrichlorosilane and 5 g of organopolysilazane were added to 10 g of ethyl acetate solution and magnetically stirred for 5 min to obtain a mixed solution.

[0028] Using a glass slide as a substrate, immerse it vertically (at a 90° angle) into the coating solution for 5 seconds, then slowly remove it at a speed of 5 mm / s.

[0029] Place it horizontally at room temperature for 24 hours to allow the polysilazane to cure on the substrate surface, thus obtaining an anti-icing and anti-slip coating.

[0030] The coating obtained in this embodiment has excellent light transmittance, maintaining 100% across the entire visible light wavelength range, such as... Figure 2 As shown, this image presents the results of a light transmittance test for the coating. As can be seen from the image, the transmittance remains close to 100% across the entire visible light range (400-800nm), indicating that the coating has excellent light transmittance across the visible light wavelength range. An embedded image shows a photograph taken through the coating, where the scene is clearly visible without significant distortion or color change, further demonstrating the coating's high transmittance.

[0031] Example 2:

[0032] Add 0.2g of perfluorodecyltrimethoxysilane and 8g of organopolysilazane to 20g of acetone solution and stir magnetically for 20min to obtain a mixed solution.

[0033] Using stainless steel as a substrate, the mixed solution obtained in this embodiment is sprayed onto the stainless steel substrate and placed at a 45° angle at room temperature for 24 hours to allow the polysilazane to cure on the substrate surface, thereby obtaining an anti-icing and anti-slip coating.

[0034] The coating obtained in this example exhibits excellent slip resistance and low ice adhesion strength, such as Figure 3 As shown: Approximately one second after a water droplet contacts the inclined stainless steel surface, it begins to slide along the surface to the bottom (70 mm in length), indicating good surface slip resistance. This slip behavior demonstrates that the applied coating provides the stainless steel surface with low water adhesion. The coating obtained in this example exhibits low ice adhesion strength, such as... Figure 4 As shown, the adhesion strength of ice on ordinary stainless steel surfaces is as high as 323 kPa, while the adhesion strength on the anti-icing and slippage coating obtained in this Example 2 is only 110 kPa, which is 34% of that on ordinary stainless steel surfaces. Therefore, the coating obtained in this example helps ice to detach from the surface.

[0035] Example 3:

[0036] Add 0.15g of perfluorohexyltrichlorosilane and 6.5g of organopolysilazane to 15g of butyl acetate solution and stir magnetically for 10min to obtain a mixed solution.

[0037] Using an aluminum alloy as a substrate, the mixed solution obtained in this embodiment is brushed onto the aluminum alloy substrate and placed vertically at a tilt angle of 0° at room temperature for 24 hours to allow the polysilazane to cure on the substrate surface, thereby obtaining an anti-icing and anti-slip coating.

[0038] The coating obtained in this example has a low ice adhesion strength. The adhesion strength of ice on a normal aluminum alloy surface is as high as 363 kPa, while the adhesion strength on the anti-icing and slippage coating obtained in Example 2 is only 100 kPa, which is 28% of that on a normal aluminum alloy surface. Therefore, the coating obtained in this example helps ice to detach from the surface.

[0039] Example 4:

[0040] 0.1 g of perfluorooctyltrichlorosilane and 5 g of perhydropolysilazane were added to 10 g of ethyl acetate solution and magnetically stirred for 5 min to obtain a mixed solution.

[0041] Using a silicon wafer as a substrate, a coating is spin-coated onto the substrate surface using a spin coater. The substrate is then placed at a 20° angle and left to stand at room temperature for 24 hours to allow the polysilazane to cure onto the substrate surface, thus obtaining an anti-icing and anti-slip coating.

[0042] The coating obtained in this example exhibits excellent stability. After ultrasonically vibrating it in an ethanol solution for 500 minutes, a water droplet applied to the tilted silicon wafer surface began to slide along the tilted surface to the bottom (70 mm long) in approximately one second, demonstrating good slip properties and mechanical stability. Polysilazane provides excellent anchoring to the substrate, and the low surface energy modifier is grafted onto the polysilazane surface via dehydration condensation to stabilize covalent bonds, thus contributing to the surface's excellent stability.

[0043] Example 5:

[0044] 0.2 g of perfluorodecyltrimethoxysilane and 10 g of perhydropolysilazane were added to 20 g of butyl acetate solution and magnetically stirred for 20 min to obtain a mixed solution.

[0045] Using a pine board as a substrate, the mixed solution obtained in this embodiment is roller-coated onto the substrate and placed at a 90° angle at room temperature for 24 hours to allow the polysilazane to cure on the substrate surface, thereby obtaining an anti-icing and anti-slip coating.

[0046] The coating obtained in this example exhibits excellent durability. After being exposed to air for 12 months, the surface remains slip-resistant, allowing water droplets to slide along the inclined surface, while also demonstrating low ice adhesion strength (111 kPa). The Si-O matrix in the polysilazane resin and the CF bonds in the low surface energy modifier are highly stable and do not decompose over time, thus contributing to the coating's durability.

[0047] The above-described embodiments are merely illustrative of the implementation methods of the present invention, but should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A method for preparing an anti-icing and anti-slip coating for a hopper in an ice jet cleaning equipment, characterized in that, The preparation method first involves mixing a low surface energy modifier with polysilazane to prepare a coating; Secondly, the coating is applied to the substrate surface to form a coating layer; Finally, the coating is cured to obtain an anti-icing and anti-slip coating. It consists of the following steps: Step (1): At room temperature, 0.1-0.2 parts by weight of low surface energy modifier and 5-8 parts by weight of polysilazane are added to 10-20 parts by weight of organic solvent and stirred to obtain a coating, wherein the stirring time is not less than 5 minutes; the low surface energy modifier is perfluorooctyltrichlorosilane, perfluorodecyltrimethoxysilane, or perfluorohexyltrichlorosilane. Step (2): Apply the coating obtained in step (1) to the substrate through a one-step dip coating process; after coating, tilt the substrate and let it stand so that a uniform coating is formed on the solid surface. Step (3): Place the coating obtained in step (2) in a room temperature air atmosphere for 24 hours to cure, and obtain an anti-icing and slip coating.

2. The method for preparing an anti-icing and anti-slip coating for a hopper in an ice jet cleaning equipment according to claim 1, characterized in that, In step (1): the polysilazane is an organopolysilazane or a perhydropolysilazane; the organic solvent is any one of acetone, ethyl acetate, and butyl acetate.

3. The method for preparing an anti-icing and anti-slip coating for a hopper in an ice jet cleaning equipment according to claim 1, characterized in that, In step (2): the tilt angle is 0°~90°; the substrate includes stainless steel, aluminum alloy, canvas, glass, silicon, pine wood, and carbon fiber.

4. An anti-icing and anti-slip coating for a hopper in an ice jet cleaning equipment, characterized in that, It is obtained by the preparation method described in any one of claims 1-3.

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