Preparation method of frost-proof and dust-proof self-cleaning glass curtain wall

Abstract

The application discloses a preparation method of frost-proof and dust-resistant self-cleaning glass curtain wall. The method comprises the following steps: depositing nano particles on the surface of glass; etching the glass by taking the nano particles as a template to obtain a mechanically stable nano conical column array structure; grafting liquid-like flexible molecular brushes on the surface of the nano conical column array structure to obtain super-hydrophobic curtain wall surface glass; and assembling the super-hydrophobic curtain wall surface glass into a glass curtain wall. The application provides a self frost-proof technology. Frost crystals are difficult to nucleate on the surface and frost formation is inhibited by the combination of high slip and low adhesion of the liquid-like flexible molecular brushes and the low surface solid area fraction of the rough structure. The frost-proof and dust-resistant self-cleaning glass curtain wall prepared by the application is self dust-proof. The deposition and adhesion of dust particles on the surface are inhibited by the combination of high slip and low adhesion of the liquid-like flexible molecular brushes and the low surface solid area fraction of the rough structure, so that self-cleaning is realized. The application is simple to use, low in cost and water resource saving.

Description

Technical Field

[0001] This invention relates to the field of glass curtain wall technology, specifically to a method for preparing a frost-proof, dust-resistant, and self-cleaning glass curtain wall. Background Technology

[0002] A glass curtain wall is a building envelope or decorative structure consisting of a supporting structural system that allows for a certain degree of displacement relative to the main structure and does not share the loads of the main structure. It offers superior lighting, unobstructed views, and a beautiful appearance; during the day, glass curtain walls reflect the blue sky and white clouds, and at night, they display dazzling light shows, combining aesthetics and practicality. Currently, the use of glass curtain walls has expanded from office buildings to residential buildings, and the demand is increasing. However, in use, glass curtain walls face problems such as dust accumulation from wind and sand, fogging due to indoor and outdoor temperature differences, and frost formation in winter, which affect lighting and aesthetics.

[0003] To solve the problem of frost formation, traditional technologies often use heating or mechanical cleaning methods for defrosting (CN211007211U, CN112681577A, CN217679876U, CN216195797U). Defrosting equipment has a complex structure, complicated processes, and high costs.

[0004] To address dust accumulation and achieve surface cleanliness, traditional technologies often employ water pumps for self-cleaning via water rinsing (CN210767419U) and TiO2 photocatalytic decontamination (CN108947268A, CN115650597A). However, even after TiO2 photocatalytically decomposes pollutants, water rinsing is still required to remove them and achieve a cleaning effect, making self-cleaning difficult in areas with insufficient rainfall. Therefore, traditional self-cleaning methods are highly dependent on water, which is detrimental to water conservation and environmental protection and energy saving. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a method for preparing a frost-proof, dust-resistant, and self-cleaning glass curtain wall.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The first aspect of this invention provides a method for preparing a frost-proof, dust-resistant, self-cleaning glass curtain wall, comprising the following steps:

[0008] (1) Depositing nanoparticles on a glass surface;

[0009] (2) Using nanoparticles as templates, glass is etched to obtain a nanocone-pillar array structure;

[0010] (3) A liquid-like flexible molecular brush is grafted onto the surface of the nanoconical array structure to obtain a superhydrophobic curtain wall surface glass.

[0011] (4) Assemble the superhydrophobic curtain wall surface glass into a glass curtain wall.

[0012] In step (1) of the preparation method of the anti-frost, anti-dust, and self-cleaning glass curtain wall of the present invention, nanoparticles are deposited on the glass surface to form a nanoparticle monolayer film.

[0013] Preferably, the nanoparticles include organic particles and inorganic particles. The organic particles include at least one of polystyrene (PS) and polymethyl methacrylate (PMMA), and the inorganic particles include at least one of silicon dioxide (SiO2), titanium dioxide (TiO2), gold, and silver particles. In some specific embodiments of the present invention, the nanoparticles are polystyrene particles.

[0014] Preferably, the nanoparticles have a particle size of <400nm, which must be smaller than the wavelength of visible light (<400nm) to ensure good light transmission performance of the glass curtain wall; more preferably, the nanoparticles have a particle size of <400nm; even more preferably, the nanoparticles have a particle size of <300nm.

[0015] Preferably, in step (1), the specific steps of depositing nanoparticles are: preparing nanoparticles into a nanoparticle dispersion, and then depositing a nanoparticle monolayer film on the glass surface; the mass concentration of nanoparticles in the nanoparticle dispersion is 0.01-10%; more preferably, the mass concentration of nanoparticles in the nanoparticle dispersion is 0.1-1%.

[0016] Preferably, in step (1), the deposition method includes at least one of pulling, spin coating, Langmuir-Blodgett (LB) film pulling, and gravity settling; in some preferred embodiments of the present invention, the deposition is carried out using Langmuir-Blodgett (LB) film pulling to prepare a nanoparticle monolayer film on the glass surface, and the extrusion and pulling speed is preferably <10 mm / min, more preferably <5 mm / min; the target surface pressure is preferably 1-50 mN / m, more preferably 2-20 mN / m.

[0017] Preferably, in step (2), the etching gas includes at least one of O2, Ar, N2, air, CF4, SF6, and CHF3.

[0018] Preferably, in step (2), the size of the nanoconical array structure is <400nm; more preferably, the size of the nanoconical array structure is ≤300nm, and the array structure size is determined by the diameter of the colloidal particles. The array structure size significantly affects the light transmittance of the curtain wall glass. The nanoconical array structure is a composite structure with an upper cone and a lower column, which can enhance the mechanical stability of the superhydrophobic surface. The height ratio of the cone to the column is 1:10-10:1, more preferably 1:2-2:1.

[0019] Preferably, in step (3), the liquid-like flexible molecular brush includes at least one of alkane, fluoroalkane, siloxane, fluorosilane, polyether, and fluoropolyether compounds.

[0020] More preferably, in step (3), the liquid-like flexible molecular brush includes at least one of organosiloxane and perfluoropolyether.

[0021] A second aspect of the present invention provides a frost-proof, dust-resistant, self-cleaning glass curtain wall, which is prepared by the aforementioned preparation method.

[0022] Preferably, the frost-proof, dust-resistant, and self-cleaning glass curtain wall also includes an inner layer of glass and a frame structure.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This invention provides a method for preparing a frost-proof, dust-resistant, and self-cleaning glass curtain wall. Compared to traditional heating or mechanical methods for defrosting the glass surface, this invention utilizes a liquid-like flexible molecular brush with high slip and low adhesion combined with a rough structure and low surface solids area fraction, making it difficult for frost crystals to nucleate on the surface and thus inhibiting frost formation. This method is self-defrosting, simple to use, low in cost, and saves energy such as electricity and heat.

[0025] Compared to traditional mechanical dust removal, water washing dust removal, and TiO2 dust removal, the anti-frost and dust-resistant self-cleaning glass curtain wall prepared by this invention is self-dustproof. It inhibits the deposition or adhesion of dust particles on the surface by combining the high slip and low adhesion of a liquid-like flexible molecular brush with the low surface solid area fraction of a rough structure, thus achieving self-cleaning. It is simple to use, low in cost, and saves water resources.

[0026] Compared to ordinary superhydrophobic structures, this invention improves the mechanical stability of superhydrophobic surfaces by fabricating a composite structure with an upper cone and a lower pillar. The upper cone structure results in a very small top diameter, achieving an ultra-low surface solid area fraction. This reduces the contact area between the structure surface and frost crystals and dust particles, thus reducing adhesion, while maintaining excellent superhydrophobic properties. The lower pillar structure ensures a large bottom and middle diameter, effectively improving the mechanical stability of the superhydrophobic surface. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the preparation process of the superhydrophobic curtain wall surface glass in Example 1;

[0028] Figure 2 SEM image of the nanoconical array structure in Example 1;

[0029] Figure 3 The transmittance spectra before and after etching in Example 1 are shown.

[0030] Figure 4 The images show the effects of dust accumulation, water washing, secondary dust accumulation, and secondary water washing on the glass surface, as well as the surface of the superhydrophobic curtain wall, serving as a reference.

[0031] Figure 5 The image shows the effect of frost falling on the glass surface of the reference glass and the superhydrophobic curtain wall surface.

[0032] Figure 6 The image shows the anti-fogging effect of frosting the glass surface of the reference glass and the superhydrophobic curtain wall surface for 5 minutes. Detailed Implementation

[0033] The specific embodiments of the present invention will be further described below. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods, and the experimental materials used in the following embodiments are all available through conventional commercial channels.

[0035] This invention provides a method for preparing a frost-proof, dust-resistant, self-cleaning glass curtain wall, such as... Figure 1 As shown, the process includes the following steps: 1. Preparation of nanoparticle monolayer films

[0036] 1) Prepare a nanoparticle dispersion with a mass concentration between 0.01% and 10%, preferably 0.1% to 1%. The nanoparticles can be, but are not limited to, organic particles, including polystyrene (PS), polymethyl methacrylate (PMMA), etc., as well as inorganic particles, including SiO2, TiO2, metallic gold, silver, etc.

[0037] 2) Nanoparticles are deposited on the cleaned glass surface and self-assembled to form a nanoparticle monolayer film. This can be achieved, but is not limited to, by methods such as dip coating, spin coating, Langmuir-Blodgett (LB) film stretching, and gravity settling. The nanoparticle size is preferably <400 nm, and more preferably ≤300 nm.

[0038] 2. Structure generated by plasma etching

[0039] Using nanoparticles as templates, the surface of curtain wall glass is etched to obtain a nanoscale rough structure, namely a nanoconical-pillar array structure. The etching gas can be one or a mixture of two or more gases, including but not limited to O2, Ar, N2, air, CF4, SF6, and CHF3. The size of the obtained nanoconical-pillar structure is preferably <400 nm, more preferably ≤300 nm. The nanoconical-pillar array structure is a composite structure with an upper cone and a lower pillar, which can enhance the mechanical stability of the superhydrophobic surface. The height ratio of the cone to the pillar is 1:10-10:1, more preferably 1:2-2:1.

[0040] 3. Grafted liquid flexible molecular brush

[0041] By grafting a liquid-like flexible molecular brush onto the etched surface of the curtain wall glass, a superhydrophobic curtain wall surface glass with high slippage and low adhesion is obtained. The liquid-like flexible molecule can be, but is not limited to, organosiloxanes, perfluoropolyethers, etc. The liquid-like flexible molecular brush possesses liquid-like properties, exhibiting high slippage and low adhesion, effectively reducing the adhesion of dust particles and frost to the surface.

[0042] 4. Assembly of glass curtain walls

[0043] Glass curtain walls consist of superhydrophobic curtain wall surface glass, insulated layer, inner glass, frame structure, and sealant.

[0044] Example 1

[0045] This embodiment provides a method for preparing a frost-proof, dust-resistant, and self-cleaning glass curtain wall. The method involves using polystyrene nanoparticles as a template to etch the glass surface of the curtain wall, and grafting a flexible molecular brush with a liquid-like material to prepare a superhydrophobic glass surface. The specific steps include:

[0046] 1. Preparation of nanoparticle monolayer films

[0047] 1) Prepare a polystyrene (PS) nanoparticle dispersion with a mass concentration of 1% and a particle size of 300 nm.

[0048] 2) A single layer of nanoparticles was deposited on the cleaned glass surface. The PS nanoparticle single layer was prepared by LB stretching method with an extrusion and stretching speed of 2 mm / min and a target surface pressure of 10 mN / m.

[0049] 2. Structure generated by plasma etching

[0050] Using nanoparticles as templates, curtain wall glass was etched to obtain a nanoscale rough structure, namely a nanoconical-pillar array structure, with a composite structure morphology of upper cones and lower pillars. The structure size was ≤300nm, and the cone-to-pillar height ratio was approximately 1:1.5. Figure 2 The SEM images show that the etching gas was Ar / CHF3. Figure 3The transmittance spectrum of the 300nm structure is shown, which shows a significant increase in transmittance compared to the unstructured surface.

[0051] 3. Grafted liquid flexible molecular brush

[0052] A flexible molecular brush made of liquid was grafted onto the etched curtain wall glass surface to obtain a superhydrophobic curtain wall surface glass with high slip and low adhesion. A perfluoropolyether liquid was selected, and after thermosetting at 130℃ for 30min, a superhydrophobic surface was obtained with a water droplet static angle of 157° and a water droplet roll-off angle of 3.6°, which meets the requirements of superhydrophobicity (water static angle > 150°, roll-off angle < 10°).

[0053] 4. Assembly of glass curtain walls

[0054] Performance tests were conducted on the superhydrophobic curtain wall surface glass, including self-cleaning tests, anti-frost and anti-fog tests.

[0055] (1) Self-cleaning. After dust is applied to the surface, water is dripped through a pipette to rinse the dust off the reference glass and superhydrophobic glass surfaces. The dust on the superhydrophobic glass surface is washed away by the water; however, the water and dust mix on the reference glass surface, and because the water is difficult to slide off the surface, dirty water remains on the reference glass surface, resulting in surface dirt. Subsequently, a second dust application and a second water wash are performed on the surface. The superhydrophobic glass surface can be cleaned a second time, while the reference glass surface becomes dirtier. For glass curtain walls, a small amount of water can clean the superhydrophobic curtain wall glass without leaving water stains; while for ordinary glass curtain wall surfaces, a large amount of water is needed to wash away the dust, and it is easy to leave dirty water stains, making it difficult to completely clean the surface dirt.

[0056] (2) Anti-frost and anti-fog. During use, it has been found that frost easily forms on the exterior glass surface when the outdoor temperature is low, while water droplets easily condense on the interior glass surface. This obstructs light transmission through the curtain wall glass, resulting in a poorer view. For example... Figure 5 The results of the frost test show that frost on the superhydrophobic surface is easy to roll off and difficult to leave residue; Figure 6 The fogging experiment showed that the superhydrophobic glass surface has an anti-fogging effect, and the text underneath can still be clearly seen after fogging. In contrast, the ordinary reference glass surface is prone to frost residue, and the text underneath is difficult to see after fogging.

[0057] Then, the superhydrophobic curtain wall surface glass, hollow layer, inner glass, frame structure and sealant are assembled to make a glass curtain wall.

[0058] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A method for preparing a frost-proof, dust-resistant, self-cleaning glass curtain wall, characterized in that, Includes the following steps: (1) Prepare a nanoparticle dispersion with a mass concentration of 0.01-10%, and then self-assemble a nanoparticle monolayer on a glass surface by at least one of the following methods: lifting, spin coating, Langmuir-Blodgett film stretching, and gravity sedimentation; wherein the nanoparticles have a particle size of <400 nm. (2) Using nanoparticles as templates, glass is etched to obtain a nanocone-pillar array structure; the size of the nanocone-pillar array structure is <400 nm; the nanocone-pillar array structure is a composite structure with an upper cone and a lower pillar, and the height ratio of the cone to the pillar is 1:10-10:

1. (3) A liquid-like flexible molecular brush is grafted onto the surface of the nanoconical array structure to obtain a superhydrophobic curtain wall surface glass; (4) Assemble the superhydrophobic curtain wall surface glass into a glass curtain wall.

2. The method for preparing the anti-frost, dust-resistant, self-cleaning glass curtain wall according to claim 1, characterized in that, The nanoparticles include organic particles and inorganic particles. The organic particles include at least one of polystyrene and polymethyl methacrylate, and the inorganic particles include at least one of silicon dioxide, titanium dioxide, gold, and silver particles.

3. The method for preparing the anti-frost, dust-resistant, self-cleaning glass curtain wall according to claim 1, characterized in that, In step (2), the etching gas includes at least one of O2, Ar, N2, air, CF4, SF6, and CHF3.

4. The method for preparing the anti-frost, dust-resistant, self-cleaning glass curtain wall according to claim 1, characterized in that, In step (3), the liquid-like flexible molecular brush includes at least one of the following: alkanes, fluoroalkanes, siloxanes, fluorosilanes, polyethers, and fluoropolyethers.

5. The method for preparing the anti-frost, dust-resistant, self-cleaning glass curtain wall according to claim 4, characterized in that, In step (3), the liquid-like flexible molecular brush includes at least one of organosiloxane and perfluoropolyether.

6. A frost-proof, dust-resistant, self-cleaning glass curtain wall, characterized in that, It is prepared by the preparation method according to any one of claims 1-5.

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