Method for producing anti-soiling easy-to-clean glass

Abstract

The application provides a preparation method of anti-dust easy-to-clean glass. A coating material is prepared by hydrolyzing and hydrophobic modifying an existing aluminum-titanium composite coupling agent, and then the coating material is coated on the surface of a glass substrate and dried and solidified to obtain the anti-dust easy-to-clean glass. The existing aluminum-titanium composite coupling agent is directly applied to the coating material of the easy-to-clean glass after simple treatment, and the anti-dust easy-to-clean glass with coating stability, self-cleaning property and dust resistance is prepared only by a simple treatment process. Compared with the existing technology in which a coating material is prepared by compounding multiple raw materials, the method has the advantages of simplicity and high efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of methods for preparing dust-resistant and easy-to-clean glass, and particularly to a method for preparing dust-resistant and easy-to-clean glass. Background Technology

[0002] Easy-clean glass is made by coating a special coating on the glass surface, making it difficult for dust or dirty liquids to adhere to the glass surface, thus keeping the glass surface clean and reducing the hassle of cleaning the glass surface.

[0003] In the prior art, patent application CN202010743993.7, published on October 27, 2020, entitled "A Long-Lasting Self-Cleaning Composition for Glass Surfaces," discloses a self-cleaning composition. This composition is obtained by compounding 0.5-5 parts of nano-titanium dioxide, 1-10 parts of a nano-silica mixture, 0.1-5 parts of an inorganic sol, 0.001-0.01 parts of a conductive agent, 0.01-0.1 parts of a metal salt, 0.01-2 parts of a catalyst, 0.01-1 parts of an acid, and 80-99 parts of a solvent. The addition of a conductive agent and titanium dioxide imparts self-cleaning ability to the composition and overcomes the light dependence inherent in existing self-cleaning coatings using titanium dioxide. However, the composition used in the above-mentioned technical solution for self-cleaning has a complex composition and a difficult-to-control manufacturing process.

[0004] In view of this, it is necessary to design an improved method for preparing dust-resistant and easy-to-clean glass to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing dust-resistant and easy-to-clean glass.

[0006] To achieve the above-mentioned objectives, the present invention provides a method for preparing dust-resistant and easy-to-clean glass, wherein the dust-resistant and easy-to-clean glass is obtained by applying a coating material to the surface of a glass substrate and then drying and curing it.

[0007] The preparation of the coating material includes the following steps:

[0008] S1. Under the catalytic action of ammonia, the aluminum-titanium composite coupling agent is hydrolyzed in isopropanol solution to obtain a mixture of aluminum hydroxide sol and titanium hydroxide sol.

[0009] S2. Add organosilicon to the mixture obtained in step S1 to modify the mixture hydrophobically, thereby obtaining a coating material.

[0010] Preferably, in step S1, the concentration of the isopropanol solution is 5-30%, and the amount of isopropanol solution added is 5-50%.

[0011] Preferably, in step S2, the organosilicon is an organohydrocyclic siloxane.

[0012] Preferably, the organosilicon is a methyl-hydro-cyclic siloxane or a hydrogen-based silsesquioxane.

[0013] Preferably, the amount of the methyl-hydro-cyclic siloxane added is 1-3 times the volume of the aluminum-titanium composite coupling agent.

[0014] Preferably, the amount of the hydrogen-based silsesquioxane added is 15-30%.

[0015] Preferably, the curing temperature is 200-300℃.

[0016] Preferably, the surface of the glass substrate needs to be pretreated before the coating material is applied to the surface of the glass substrate.

[0017] Preferably, the pretreatment is plasma treatment.

[0018] The beneficial effects of this invention are:

[0019] 1. The method for preparing dust-resistant and easy-to-clean glass proposed in this invention involves hydrolyzing and hydrophobically modifying an existing aluminum-titanium composite coupling agent to obtain a coating material, which is then coated onto the surface of a glass substrate and dried and cured. During this process, hydrolysis yields a mixture of aluminum hydroxide sol and titanium hydroxide sol containing nano-AlOOH / TiOOH particles. These nano-AlOOH / TiOOH particles bind with the active hydroxyl groups on the glass substrate surface. During the curing process, dehydration forms an Al2O3 / TiO2 particle layer. This particle layer blocks the pores on the glass surface and forms a dense nano-layer, giving the glass substrate excellent anti-fouling and self-cleaning capabilities. Furthermore, the organosilicon introduced during hydrophobic modification reacts chemically with the active hydroxyl groups on the surface of the nano-AlOOH / TiOOH particles at high temperatures, forming strong covalent bonds. This effectively enhances the adhesion between the coating and the glass, ensuring the stability of the coating. Simultaneously, the introduction of hydrophobic silane groups gives the coating material hydrophobicity, improving the anti-fouling ability of the glass substrate.

[0020] 2. The method for preparing dust-resistant and easy-to-clean glass proposed in this invention involves directly applying the existing aluminum-titanium composite coupling agent to the coating material of easy-to-clean glass after simple treatment. This process only requires a simple treatment procedure to obtain dust-resistant and easy-to-clean glass with coating stability, self-cleaning properties and dust resistance. Compared with the existing technology of preparing coating materials by compounding multiple raw materials, it has the advantages of simplicity and high efficiency. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to specific embodiments.

[0022] It should also be noted here that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] This invention provides a method for preparing dust-resistant and easy-to-clean glass. The dust-resistant and easy-to-clean glass is obtained by coating a coating material onto a glass substrate and then drying and curing it at 200-300℃. In order to make the bonding force between the glass substrate and the coating material stronger, the glass substrate needs to be pretreated by means of plasma treatment or other methods before coating, so that the surface of the glass substrate has active hydroxyl groups.

[0024] Specifically, the preparation of the coating material includes the following steps:

[0025] S1. Under the catalytic action of ammonia, the aluminum-titanium composite coupling agent is hydrolyzed in isopropanol solution to obtain a mixture of aluminum hydroxide sol and titanium hydroxide sol.

[0026] S2. Add organosilicon to the mixture of aluminum hydroxide sol and titanium hydroxide sol obtained in step S1 to modify the mixture hydrophobically and obtain a coating material.

[0027] Preferably, in step S1, the concentration of the isopropanol solution is 5-30%, and the amount added is 5-50%. The amount added is based on the percentage of the added isopropanol solution in the entire system. The effective components in the isopropanol solution can determine the content of aluminum hydroxide sol and titanium hydroxide sol obtained after hydrolysis of the aluminum-titanium composite coupling agent. The content of aluminum hydroxide sol and titanium hydroxide sol in the mixture of aluminum hydroxide sol and titanium hydroxide sol is 35-55%, and the sum of their contents is 100%.

[0028] Preferably, in step S2, the organosilicon is an organohydrocyclic siloxane, specifically a methyl-hydro-cyclic siloxane or a hydrogen-based silsesquioxane; when the organosilicon is a methyl-hydro-cyclic siloxane, the amount added is 1-3 times the volume of the aluminum-titanium composite coupling agent; when the organosilicon is a hydrogen-based silsesquioxane, the amount added is 15-30%, which is also the percentage of organosilicon in the entire system; it should be noted that the aluminum-titanium composite coupling agent in this scheme is a commercially available product, model LT-1.

[0029] The preparation method of the dust-resistant and easy-to-clean glass of the present invention will be further described below with reference to specific embodiments:

[0030] Example 1

[0031] This embodiment prepares a dust-resistant and easy-to-clean glass, which is obtained by coating a coating material onto the surface of a glass substrate and then drying and curing it at 100-300℃.

[0032] Furthermore, the preparation of the coating material includes the following steps:

[0033] S1. Under the catalytic action of ammonia, the aluminum-titanium composite coupling agent is hydrolyzed in isopropanol solution to obtain a mixture of aluminum hydroxide sol and titanium hydroxide sol; wherein, the concentration of isopropanol solution is 30% and the amount added is 50%.

[0034] S2. Add 70% of a hydrogen-based silsesquioxane to the mixture of aluminum hydroxide sol and titanium hydroxide sol in step S1 to hydrophobically modify the mixture and obtain a coating material.

[0035] To investigate the performance of the dust-resistant and easy-to-clean glass prepared in this embodiment, the following tests were conducted: The glass surface was wiped 5000 times with a soft cloth, and the degree of coating material retention on the glass surface after wiping was compared to evaluate the glass's abrasion resistance; colored items such as markers and lipsticks were applied to the glass surface, dried at room temperature, and then the stains on the glass surface were wiped off to evaluate the glass's self-cleaning ability; to evaluate the glass's dust resistance, the glass was placed in a dusty environment, and after a period of time, the dust on the glass surface was wiped off, with the ease of wiping used to evaluate the glass's dust resistance. Each performance characteristic was categorized into several levels: excellent, good, average, and poor.

[0036] Examples 2 to 5

[0037] The only difference between Examples 2 to 5 and Example 1 is the concentration and amount of isopropanol solution used in the preparation of the coating material. Other steps are essentially the same as in Example 1 and will not be repeated here. Table 1 shows the performance of the dust-resistant and easy-to-clean glass prepared under the corresponding conditions of isopropanol solution concentration and amount in Examples 1 to 5. The data in the table shows that when the isopropanol concentration is 30%, the dust-resistant and easy-to-clean glass exhibits excellent abrasion resistance, self-cleaning properties, and dust resistance. This is because adding an appropriate concentration of isopropanol solution ensures that the hydrolysis product of the aluminum-titanium composite coupling agent contains sufficient aluminum hydroxide sol and titanium hydroxide sol, which, after subsequent hydrophobic modification, can bind the glass substrate and coating material together using the interaction force between the two and the glass substrate surface.

[0038] Table 1 shows the concentration and amount of isopropanol solution used in Examples 1 to 5, and the performance of the dust-resistant and easy-clean glass prepared under the corresponding conditions.

[0039]

[0040] Examples 6 to 7

[0041] The only difference between Examples 6 and 7 and Example 1 is that the amount of organosilicon added during the hydrophobic modification process in step S1 is different from that in Example 1. The other steps are basically the same as in Example 1 and will not be repeated here. Table 2 shows the amount of organosilicon added in Examples 1 and 6 to 7 and the properties of the dust-resistant and easy-to-clean glass prepared under the corresponding conditions. The data in the table show that adding an appropriate amount of organosilicon can impart a certain degree of hydrophobicity to the mixture of aluminum hydroxide sol and titanium hydroxide sol, enabling the coating material to possess dust-resistant and self-cleaning properties.

[0042] Table 2 shows the amount of organosilicon added in Examples 1 and 6-7 and the properties of the dust-resistant and easy-clean glass prepared under the corresponding conditions.

[0043] project Amount of organosilicon added (%) abrasion resistance Self-cleaning Gray resistance Example 1 30 excellent excellent excellent Example 6 15 generally good good Example 7 20 good good good

[0044] Comparative Example 1

[0045] The difference between Comparative Example 1 and Example 1 is that the aluminum-titanium composite coupling agent is not hydrolyzed and hydrophobically modified, but is directly used as a coating material. The other steps are basically the same as those in Example 1, and will not be repeated here.

[0046] Comparative Example 2

[0047] The difference between Comparative Example 2 and Example 1 is that only the aluminum-titanium composite coupling agent is hydrolyzed, without hydrophobic modification. The other steps are basically the same as in Example 1, and will not be repeated here.

[0048] Comparative Example 3

[0049] The difference between Comparative Example 3 and Example 1 is that the coating material is not prepared using an aluminum-titanium composite coupling agent. Instead, the mixture of directly prepared aluminum hydroxide sol and titanium hydroxide sol is hydrophobically modified and used as the coating material. In this comparative example, the content of aluminum hydroxide sol and titanium hydroxide sol in the coating material is the same as in Example 1. Other steps are basically the same as in Example 1, and will not be repeated here. The performance of the dust-resistant and easy-to-clean glass prepared in Example 1 and Comparative Examples 1 to 3 is shown in Table 3. The data in the table shows that the dust-resistant and easy-to-clean glass prepared using the method proposed in this invention has superior performance. This is because: In the coating material prepared by hydrolysis and hydrophobic modification of the aluminum-titanium composite coupling agent in this invention, the nano-AlOOH or TiOOH particles in the sol of the hydrolyzed mixture combine with the active hydroxyl groups on the glass surface. During the drying and curing process, dehydration forms an Al2O3 or TiO2 particle layer. The presence of this particle layer effectively blocks the capillary pores on the glass surface and forms a dense nano-layer on its surface, thereby endowing the glass with anti-fouling and easy-to-clean properties, effectively preventing mold and stains. On the other hand, during the drying and curing process, the hydrogen-containing cyclic siloxane reacts chemically with the active hydroxyl groups on the surface of the nanoparticles to form very strong chemical covalent bonds, effectively enhancing the bonding force between the glass substrate and the coating material, ensuring the stability between the coating material and the glass substrate. In contrast, Comparative Examples 1 to 3 do not exhibit these effects; the coating material is simply deposited on the surface of the glass substrate and bonded together by electrostatic adsorption, thus its stability is not as good as that of Example 1.

[0050] Table 3. Performance of the dust-resistant and easy-clean glass prepared in Example 1 and Comparative Examples 1 to 3

[0051] project abrasion resistance Self-cleaning Gray resistance Example 1 excellent excellent excellent Comparative Example 1 Difference Difference Difference Comparative Example 2 Difference Difference Difference Comparative Example 3 Difference Difference Difference

[0052] In summary, the method for preparing dust-resistant and easy-to-clean glass proposed in this invention obtains a mixture of aluminum hydroxide sol and titanium hydroxide sol containing nano-AlOOH / TiOOH particles through hydrolysis. The nano-AlOOH / TiOOH particles bind to the active hydroxyl groups on the glass substrate surface, and during the curing process, dehydration forms an Al2O3 / TiO2 particle layer. This particle layer blocks the pores on the glass surface and forms a dense nano-layer, endowing the glass substrate with excellent anti-fouling and self-cleaning capabilities. Secondly, the organosilicon introduced during hydrophobic modification reacts chemically with the active hydroxyl groups on the surface of the nano-AlOOH / TiOOH particles at high temperatures, forming strong covalent bonds, effectively enhancing the adhesion between the coating and the glass and ensuring the stability of the coating. Simultaneously, the introduction of hydrophobic silane groups makes the coating material hydrophobic, improving the anti-fouling ability of the glass substrate. By simply treating existing aluminum-titanium composite coupling agents and directly applying them to the coating material of easy-to-clean glass, this method offers advantages in simplicity and efficiency compared to existing techniques that use multiple raw materials to prepare coating materials.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing dust-resistant and easy-to-clean glass, characterized in that, The dust-resistant and easy-to-clean glass is made by applying a coating material to the surface of a glass substrate and then drying and curing it. The preparation of the coating material includes the following steps: S1. Under the catalytic action of ammonia, the aluminum-titanium composite coupling agent is hydrolyzed in isopropanol solution to obtain a mixture of aluminum hydroxide sol and titanium hydroxide sol; the concentration of the isopropanol solution is 25-30%; the amount of isopropanol solution added is 50%. S2. Add organosilicon to the mixture obtained in step S1 to modify the mixture hydrophobically and obtain a coating material. The organosilicon is a hydrogen-based silsesquioxane; the amount of the hydrogen-based silsesquioxane added is 15-30%.

2. The method for preparing dust-resistant and easy-to-clean glass according to claim 1, characterized in that, The curing temperature is 200-300℃.

3. The method for preparing dust-resistant and easy-to-clean glass according to claim 1, characterized in that, Before applying the coating material to the surface of the glass substrate, the surface of the glass substrate is pretreated.

4. The method for preparing dust-resistant and easy-to-clean glass according to claim 3, characterized in that, The pretreatment is plasma treatment.

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