Thermal insulation toughened glass and preparation method thereof

Abstract

The application discloses a kind of heat insulation toughened glass and preparation method thereof, it is related to toughened glass coating technical field.The application is first with dopamine and the hydrogen bond combination of nanometer silicon dioxide and the self-aggregation reaction of dopamine, form the micrometer level particle with core-shell structure, and it is added to epoxy resin to form coating, coating is solidified after the surface of toughened glass, using dimethyl sulfoxide to the selective dissolution of polydopamine on coating surface, form the micrometer level pore structure;Then nanometer titanium dioxide is deposited on the surface of coating, forms the micro-nano double rough structure similar to lotus leaf surface;Micrometer level pore structure can effectively block the transmission of heat, the introduction of nanometer titanium dioxide enhances the infrared reflection performance of coating, reduces the transmittance of near infrared in sunlight, so as to significantly improve the heat insulation performance of coating;Finally, through the coating of gamma-methacryloxypropyl trimethoxysilane, prepare heat insulation, hydrophobic multi-coating toughened glass.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of toughened glass coating, in particular to a heat-insulating toughened glass and a preparation method thereof. BACKGROUND

[0002] As a functional material widely used in the fields of building, automobile and solar energy, heat-insulating toughened glass is favored due to its excellent mechanical strength and safety. However, with the increasing demand for energy saving and environmental protection, the heat-insulating performance of traditional toughened glass has been unable to meet the high standard requirements of modern applications. At present, common heat-insulating coating technologies mainly use metal oxides (such as indium tin oxide, zinc oxide) or organic polymer materials to form a heat-insulating layer on the surface of glass by sputtering, spraying or dipping, etc. However, these technologies have problems such as poor adhesion, low durability and poor optical performance, for example, the coating is easy to peel off, easy to age and fail in high temperature and high humidity environment, and the light transmittance is low, affecting the visual effect.

[0003] In recent years, nanomaterials (such as nanometer titanium dioxide, nanometer silicon dioxide) have been introduced into the field of heat-insulating coating to improve the performance of the coating by utilizing their unique optical, thermal and mechanical properties. However, the agglomeration of nanoparticles leads to uneven coating, and the preparation process is complex and costly, and the function is single, which is difficult to meet the demand for multifunctionalization. In addition, multi-layer composite coating technology realizes multifunctionalization by stacking different functional materials (such as heat-insulating layer, reflective layer, protective layer), but has problems such as difficulty in thickness control, poor interface compatibility and high production cost. Therefore, it is an urgent need to develop a new type of heat-insulating toughened glass with excellent heat-insulating performance, hydrophobicity and simple process, and a coating preparation method thereof, by optimizing the coating material, structure and process, to realize the integration of multiple functions such as heat insulation and self-cleaning, to meet the energy saving and environmental protection requirements of modern buildings and industries for high-performance glass SUMMARY

[0004] The purpose of the present application is to provide a heat-insulating toughened glass and a preparation method thereof to solve the problems in the prior art.

[0005] In order to solve the above technical problems, the present application provides the following technical scheme: a heat-insulating toughened glass, the surface of the toughened glass has a composite coating, micrometer-sized particles with core-shell structure are formed by polydopamine and nanometer-sized silicon dioxide, which are added to epoxy resin to form a coating, and the polydopamine on the surface of the coating is selectively dissolved by dimethyl sulfoxide to form a micrometer-sized pore structure; nanometer-sized titanium dioxide is deposited on the surface of the coating, and finally a sealing layer is prepared by gamma-methacryloxypropyl trimethoxysilane.

[0006] Further, a preparation method of a heat-insulating toughened glass comprises the following preparation steps:

[0007] (1) 1.0-6.0 g of dopamine hydrochloride is dissolved in 50 mL of Tris-HCl buffer, stirred to complete dissolution, the stirring speed is 120 rpm, and the stirring time is 30 min; then 0.5-1.5 g of nano-silicon dioxide is added, ultrasonic dispersion is performed for 10-30 min, the ultrasonic power is 100-300 W, then the mixture is stirred at room temperature for 24 h, the stirring speed is 60 rpm, dopamine is self-polymerized on the surface of nano-silicon dioxide to form a core-shell structure; then centrifugal separation is performed, the centrifugal speed is 8000 rpm, the time is 5-10 min, the solid particles are collected after the centrifugal separation is completed, and the solid particles are washed with deionized water for 3 times, finally, drying is performed at 50 °C for 6 h, to obtain the core-shell structure particles of polydopamine embedded nano-silicon dioxide;

[0008] (2) 10-20 g of epoxy resin is mixed with 20-50 mL of acetone, stirred at a speed of 120 rpm for 30 min, 1.0-3.8 g of polydopamine embedded nano-silicon dioxide particles are added, ultrasonic dispersion is performed for 30 min, the power is 300 W, then 1.0-2.0 g of a curing agent is added, stirring is performed at a speed of 120 rpm for 20 min, the mixed coating is coated on the surface of the tempered glass, and curing is performed at 80-120 °C for 2 h, to prepare the tempered glass coated with a gradient heat insulation structure coating;

[0009] (3) the tempered glass coated with the gradient heat insulation structure coating is immersed in dimethyl sulfoxide, the dimethyl sulfoxide needs to completely immerse the tempered glass, room temperature immersion is performed for 10-30 min, the tempered glass is taken out, washed with deionized water for 3 times to remove the residual dimethyl sulfoxide, and drying is performed at 60 °C for 1 h, to form a coating surface with a micron-level hole structure; then the tempered glass is completely immersed in a nano-titanium dioxide dispersion liquid, ultrasonic treatment is performed for 30 min, the ultrasonic power is 20 kHz-40 kHz, the tempered glass is taken out, and drying is performed at 60 °C for 1 h, so that the nano-titanium dioxide is deposited on the coating surface to form a micro-nano double rough structure similar to the surface of a lotus leaf;

[0010] (4) 5.0 g of γ-methacryloxypropyl trimethoxysilane is dissolved in 50 mL of an organic solvent, 10 mL of deionized water is added, 0.5-1.5 g of a catalyst is added, stirring is performed at a speed of 120 rpm for 30-150 min, to obtain a γ-methacryloxypropyl trimethoxysilane solution; the tempered glass is immersed in the γ-methacryloxypropyl trimethoxysilane solution, room temperature immersion is performed for 1-3 h, the tempered glass is slowly pulled out, drying is performed at 60 °C for 10-30 min, and curing is performed at 100-120 °C for 2 h, to obtain the heat insulation tempered glass.

[0011] Further, the concentration of the Tris-HCl buffer in the step (1) is 10-30 mM.

[0012] Further, the curing agent in the step (2) is 2-methylimidazole.

[0013] Further, the coating thickness in the step (2) is 80-100 mu m.

[0014] Further, the preparation method of the nano-titanium dioxide dispersion liquid in the step (3) is as follows: 1g of nano-titanium dioxide, 0.1g of dispersant and 20g of deionized water are mixed, first stirred by magnetic force at a speed of 60 rpm for 10-20 min, and then ultrasonic treatment is carried out for 30-60 min at a power of 200-500 W to obtain the nano-titanium dioxide dispersion liquid.

[0015] Further, the dispersant is sodium dodecyl sulfate.

[0016] Further, the organic solvent in the step (4) is ethanol.

[0017] Further, the catalyst in the step (4) is acetic acid.

[0018] Further, the speed of slow pulling in the step (4) is 1-10 cm / min.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] Firstly, the present application uses epoxy resin as raw material to prepare toughened glass paint, through hydrogen bond combination of dopamine and nano-silicon dioxide and self-polymerization of dopamine, micrometer-sized particles with core-shell structure are formed, and the micrometer-sized particles are added to the epoxy resin to form the paint, and the polydopamine embeds the nano-silicon dioxide in the paint to form a gradient structure; the polydopamine close to the outside absorbs and reflects part of the light and heat, the nano-silicon dioxide further scatters and reflects the remaining light, and blocks the heat conduction inward by virtue of low thermal conductivity, and the polydopamine close to the coated object again blocks the heat, forming multiple heat insulation lines of defense.

[0021] Secondly, after the coating is cured on the surface of the tempered glass, the polydopamine on the surface of the coating is selectively dissolved by using dimethyl sulfoxide to form a micrometer-sized pore structure; then, nanometer-sized titanium dioxide is deposited on the surface of the coating, and the micrometer-sized pores and the nanometer-sized titanium dioxide synergistically form a micro-nano double rough structure similar to the surface of a lotus leaf, which endows the coating with super-hydrophobic properties, and water droplets on the surface easily roll off, simultaneously taking away dust and dirt to achieve a self-cleaning effect; the micrometer-sized pore structure of the coating can effectively block the transfer of heat, and the introduction of the nanometer-sized titanium dioxide further enhances the infrared reflection performance of the coating, reduces the transmittance of near-infrared rays in sunlight, and thus significantly improves the heat insulation performance of the coating; finally, a dense siloxane network structure coating is formed by the self-condensation reaction of the silicon hydroxyl groups generated by the surface hydrolysis of γ-methacryloxypropyltrimethoxysilane, and then a sealing layer is formed, thereby preparing a heat-insulating, hydrophobic multi-coating tempered glass. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0023] In order to more clearly illustrate the method provided by the present application, the following embodiments are described in detail. In the following embodiments, the test methods of various indexes of a heat-insulating tempered glass prepared are as follows:

[0024] Hydrophobicity: The static water contact angle of the tempered glass prepared in the examples and the comparative examples is measured by a contact angle meter.

[0025] Heat insulation: A square foam heat preservation box with a side length of 20 cm and an open top is used, the tempered glass in the examples and the comparative examples is made into a shape slightly larger than the open top, and is placed on the top. A 500W infrared lamp similar to the infrared spectrum of sunlight is used as a light source, the sample is placed 30 cm away from the light source, and the temperature change in the box before and after irradiation for 2h is recorded, which is δT.

[0026] Example 1

[0027] (1) 1.0 g of dopamine hydrochloride was dissolved in 50 mL of Tris-HCl buffer, stirred to complete dissolution, the stirring speed was 120 rpm, and the stirring time was 30 min; then 0.5 g of nano-silicon dioxide was added, ultrasonic dispersion was performed for 10 min at a power of 100 W, and then the mixture was stirred at room temperature for 24 h at a stirring speed of 60 rpm to allow dopamine to self-assemble on the surface of nano-silicon dioxide to form a core-shell structure; then centrifugal separation was performed at a centrifugal speed of 8000 rpm for 5 min, and the solid particles were collected and washed with deionized water for 3 times, and finally dried at 50°C for 6 h to obtain core-shell structure particles of polydopamine-embedded nano-silicon dioxide;

[0028] (2) 10 g of epoxy resin was mixed with 20 mL of acetone, stirred at a speed of 120 rpm for 30 min, 1.0 g of polydopamine-embedded nano-silicon dioxide particles were added, ultrasonic dispersion was performed for 30 min at a power of 300 W, and then 1.0 g of a curing agent 2-methylimidazole was added, stirred at a speed of 120 rpm for 20 min, the mixed coating was coated on the surface of the tempered glass at a coating thickness of 80 μm, and cured at 80°C for 2 h to prepare a tempered glass coated with a gradient heat insulation structure coating;

[0029] (3) The tempered glass coated with the gradient heat insulation structure coating was immersed in dimethyl sulfoxide, the dimethyl sulfoxide needed to completely immerse the tempered glass, room temperature immersion was performed for 10 min, the tempered glass was taken out, washed with deionized water for 3 times to remove residual dimethyl sulfoxide, and dried at 60°C for 1 h to form a coating surface with a micrometer-level hole structure; 1 g of nano-titanium dioxide, 0.1 g of a dispersing agent sodium dodecyl sulfate and 20 g of deionized water were mixed, first stirred at a speed of 60 rpm for 10 min by a magnetic stirrer, and then ultrasonic dispersion was performed for 30 min at a power of 200 W to obtain a nano-titanium dioxide dispersion liquid; then the tempered glass was completely immersed in the nano-titanium dioxide dispersion liquid, ultrasonic treatment was performed for 30 min at an ultrasonic power of 20 kHz, the tempered glass was taken out, and dried at 60°C for 1 h to allow the nano-titanium dioxide to deposit on the surface of the coating to form a micro-nano double rough structure similar to the surface of a lotus leaf;

[0030] (4) 5.0 g of γ-methacryloxypropyl trimethoxysilane was dissolved in 50 mL of ethanol, 10 mL of deionized water was added, 0.5 g of acetic acid was added, and stirred at a speed of 120 rpm for 30 min to obtain a γ-methacryloxypropyl trimethoxysilane solution; the tempered glass was immersed in the γ-methacryloxypropyl trimethoxysilane solution, room temperature immersion was performed for 1 h, the tempered glass was slowly pulled out at a speed of 1 cm / min, first dried at 60°C for 10 min, and then cured at 100°C for 2 h to obtain a heat insulation tempered glass.

[0031] Example 2

[0032] (1) 3.5 g of dopamine hydrochloride was dissolved in 50 mL of Tris-HCl buffer, stirred to complete dissolution, the stirring speed was 120 rpm, and the stirring time was 30 min; then 1.0 g of nano-silicon dioxide was added, ultrasonic dispersion was performed for 20 min at a power of 200 W, and then the mixture was stirred at room temperature for 24 h at a stirring speed of 60 rpm to allow dopamine to self-polymerize on the surface of the nano-silicon dioxide to form a core-shell structure; then, centrifugal separation was performed at a centrifugal speed of 8000 rpm for 7.5 min, and the solid particles were collected and washed with deionized water for 3 times, and finally dried at 50°C for 6 h to obtain the core-shell structure particles of polydopamine-embedded nano-silicon dioxide;

[0033] (2) 15 g of epoxy resin was mixed with 35 mL of acetone, stirred at a speed of 120 rpm for 30 min, 2.4 g of polydopamine-embedded nano-silicon dioxide particles were added, ultrasonic dispersion was performed for 30 min at a power of 300 W, and then 1.5 g of a curing agent 2-methylimidazole was added, stirred at a speed of 120 rpm for 20 min, the mixed coating was coated on the surface of the tempered glass with a coating thickness of 90 μm, and cured at 100°C for 2 h to prepare the tempered glass coated with a gradient heat insulation structure coating;

[0034] (3) The tempered glass coated with the gradient heat insulation structure coating was immersed in dimethyl sulfoxide, the dimethyl sulfoxide needed to completely immerse the tempered glass, room temperature immersion was performed for 20 min, the tempered glass was taken out, washed with deionized water for 3 times to remove the residual dimethyl sulfoxide, and dried at 60°C for 1 h to form a coating surface with a micrometer-level hole structure; 1 g of nano-titanium dioxide, 0.1 g of a dispersing agent sodium dodecyl sulfate and 20 g of deionized water were mixed, first stirred at a speed of 60 rpm for 15 min by a magnetic stirrer, and then ultrasonic dispersion was performed for 45 min at a power of 350 W to obtain a nano-titanium dioxide dispersion liquid; then, the tempered glass was completely immersed in the nano-titanium dioxide dispersion liquid, ultrasonic treatment was performed for 30 min at an ultrasonic power of 30 kHz, the tempered glass was taken out, and dried at 60°C for 1 h to allow the nano-titanium dioxide to deposit on the coating surface to form a micro-nano double rough structure similar to the surface of a lotus leaf;

[0035] (4) 5.0 g of γ-methacryloxypropyl trimethoxysilane was dissolved in 50 mL of ethanol, 10 mL of deionized water was added, 1.0 g of acetic acid was added, and stirred at a speed of 120 rpm for 90 min to obtain a γ-methacryloxypropyl trimethoxysilane solution; the tempered glass was immersed in the γ-methacryloxypropyl trimethoxysilane solution, room temperature immersion was performed for 2 h, the tempered glass was slowly pulled out at a speed of 5.5 cm / min, first dried at 60°C for 20 min, and then cured at 110°C for 2 h to obtain the heat insulation tempered glass.

[0036] Example 3

[0037] (1) 6.0 g of dopamine hydrochloride was dissolved in 50 mL of Tris-HCl buffer, stirred to complete dissolution, the stirring speed was 120 rpm, and the stirring time was 30 min; then 1.5 g of nano-silicon dioxide was added, ultrasonic dispersion was performed for 30 min, the ultrasonic power was 300 W, and then the mixture was stirred at room temperature for 24 h at a stirring speed of 60 rpm to allow dopamine to self-polymerize on the surface of nano-silicon dioxide to form a core-shell structure; then centrifugal separation was performed at a centrifugal speed of 8000 rpm for 10 min, and the solid particles were collected and washed with deionized water for 3 times, and finally dried at 50°C for 6 h to obtain core-shell structure particles of nano-silicon dioxide embedded with polydopamine;

[0038] (2) 20 g of epoxy resin was mixed with 50 mL of acetone, stirred at a speed of 120 rpm for 30 min, 3.8 g of polydopamine embedded nano-silicon dioxide particles were added, ultrasonic dispersion was performed for 30 min at a power of 300 W, 2.0 g of a curing agent 2-methylimidazole was further added, stirring was performed at a speed of 120 rpm for 20 min, the mixed coating was coated on the surface of the tempered glass at a coating thickness of 100 μm, and the tempered glass coated with the gradient heat insulation structure coating was prepared by curing at 120°C for 2 h;

[0039] (3) The tempered glass coated with the gradient heat insulation structure coating was immersed in dimethyl sulfoxide, the dimethyl sulfoxide needed to completely immerse the tempered glass, room temperature immersion was performed for 30 min, the tempered glass was taken out, washed with deionized water for 3 times to remove residual dimethyl sulfoxide, and dried at 60°C for 1 h to form a coating surface with a micrometer level hole structure; 1 g of nano-titanium dioxide, 0.1 g of a dispersing agent sodium dodecyl sulfate and 20 g of deionized water were mixed, magnetic stirring was first performed at a speed of 60 rpm for 20 min, and then ultrasonic dispersion was performed for 60 min at a power of 500 W to prepare a nano-titanium dioxide dispersion liquid; then, the tempered glass was completely immersed in the nano-titanium dioxide dispersion liquid, ultrasonic treatment was performed for 30 min at an ultrasonic power of 40 kHz, the tempered glass was taken out, and dried at 60°C for 1 h to allow the nano-titanium dioxide to deposit on the coating surface to form a micro-nano double rough structure similar to the surface of a lotus leaf;

[0040] (4) 5.0 g of γ-methacryloxypropyl trimethoxysilane was dissolved in 50 mL of ethanol, 10 mL of deionized water was added, 1.5 g of acetic acid was further added, and stirring was performed at a speed of 120 rpm for 150 min to prepare a γ-methacryloxypropyl trimethoxysilane solution; the tempered glass was immersed in the γ-methacryloxypropyl trimethoxysilane solution, room temperature immersion was performed for 3 h, the tempered glass was slowly pulled out at a speed of 10 cm / min, dried at 60°C for 30 min, and cured at 120°C for 2 h to prepare the heat insulation tempered glass.

[0041] Comparative Example 1

[0042] The difference between Comparative Example 1 and Example 2 is that steps (1) (2) are different, which are changed to: (1) 3.5 g of dopamine hydrochloride is dissolved in 50 mL of Tris-HCl buffer, stirred to complete dissolution, stirred for 24 h, the stirring speed is 60 rpm, and dopamine is self-polymerized; then centrifugal separation is performed at a centrifugal speed of 8000 rpm for 7.5 min, the solid particles are collected at the end of centrifugation, and washed with deionized water for 3 times, and finally dried at 50°C for 6 h to obtain polydopamine;

[0043] (2) 15 g of epoxy resin is mixed with 35 mL of acetone, stirred at a speed of 120 rpm for 30 min, 2.4 g of polydopamine is added, ultrasonic dispersion is performed for 30 min at a power of 300 W, 1.5 g of curing agent 2-methylimidazole is further added, stirred at a speed of 120 rpm for 20 min, the mixed coating is coated on the surface of the tempered glass with a coating thickness of 90 μm, and cured at 100°C for 2 h to prepare the tempered glass coated with the gradient thermal insulation structure coating; the remaining steps are the same as those in Example 2.

[0044] Comparative Example 2

[0045] The difference between Comparative Example 2 and Example 2 is that there is no step (2), and step (3) is changed to: 1 g of nano-titanium dioxide, 1 g of nano-silicon dioxide, 0.1 g of dispersing agent sodium dodecyl sulfate and 20 g of deionized water are mixed, first stirred at a speed of 60 rpm for 15 min by magnetic stirring, and then a mixed dispersion liquid is prepared by ultrasonic treatment at a power of 350 W for 45 min; then, the tempered glass is completely immersed in the mixed dispersion liquid, ultrasonic treatment is performed for 30 min at an ultrasonic power of 30 kHz, the tempered glass is taken out, and dried at 60°C for 1 h; the remaining steps are the same as those in Example 2.

[0046] Comparative Example 3

[0047] The difference between Comparative Example 3 and Example 2 is that step (3) is different, which is changed to: the tempered glass coated with the gradient thermal insulation structure coating is immersed in dimethyl sulfoxide, the dimethyl sulfoxide needs to completely immerse the tempered glass, room temperature immersion is performed for 20 min, the tempered glass is taken out, washed with deionized water for 3 times to remove the residual dimethyl sulfoxide, and dried at 60°C for 1 h to form a coating surface with a micrometer-sized hole structure; the remaining steps are the same as those in Example 2.

[0048] Comparative Example 4

[0049] The difference between Comparative Example 4 and Example 2 is that there is no step (4), and step (3) is changed to: immerging the tempered glass coated with the gradient thermal insulation structure coating into dimethyl sulfoxide, the dimethyl sulfoxide needs to immerse the tempered glass completely, room temperature immersion for 20 min, taking out the tempered glass, washing with deionized water for 3 times to remove residual dimethyl sulfoxide, and drying at 60℃ for 1 h to form a coating surface with a micrometer-sized hole structure; mixing 1 g of nano-titanium dioxide, 0.1 g of dispersing agent sodium dodecyl sulfate and 20 g of deionized water, first stirring with a magnetic stirrer at a speed of 60 rpm for 15 min, and then ultrasonicating for 45 min with a power of 350 W to prepare a nano-titanium dioxide dispersion liquid; then, immerging the tempered glass completely into the nano-titanium dioxide dispersion liquid, ultrasonicating for 30 min with an ultrasonic power of 30 kHz, taking out the tempered glass, and drying at 60℃ for 1 h to make the nano-titanium dioxide deposit on the coating surface to form a micro-nano double rough structure similar to the surface of a lotus leaf, thereby preparing the thermal insulation tempered glass; and the rest of the steps are the same as those in Example 2.

[0050] Effect Example

[0051] The performance analysis results of one kind of thermal insulation tempered glass using Examples 1 to 3 and Comparative Examples 1 to 4 of the present application are shown in Table 1 below.

[0052] Table 1

[0053]

[0054]

[0055] From the comparison of the experimental data of the heat insulation of the examples and the comparative examples, it can be found that the tempered glass coating prepared by using the epoxy resin as the raw material in the present application, through the hydrogen bond combination of dopamine and nanosilica and the self-polymerization of dopamine, forms the micrometer-sized particles with the core-shell structure, and adds them into the epoxy resin to form the coating, and the nanosilica is embedded in the coating by the polydopamine to form the gradient structure; the polydopamine close to the outside absorbs and reflects part of the light and heat, the nanosilica further scatters and reflects the remaining light, and blocks the heat conduction inward by virtue of the low thermal conductivity, and the polydopamine close to the coated object blocks the heat again, forming multiple heat insulation lines of defense. The micrometer-sized hole structure of the coating after the deposition of nanoscale titanium dioxide can effectively block the heat transfer, and the introduction of nanoscale titanium dioxide further enhances the infrared reflection performance of the coating, reduces the transmittance of the near-infrared rays in the sunlight, thereby significantly improving the heat insulation performance of the coating. From the comparison of the experimental data of the hydrophobicity of the examples and the comparative examples, it can be found that after the coating on the surface of the tempered glass is cured, the polydopamine on the surface of the coating is selectively dissolved by using dimethyl sulfoxide to form a micrometer-sized hole structure; then nanoscale titanium dioxide is deposited on the surface of the coating, and the synergistic effect of the micrometer-sized hole and the nanoscale titanium dioxide forms a micro-nano double rough structure similar to the surface of a lotus leaf, which endows the coating with super-hydrophobic performance, and water droplets on the surface easily roll off, at the same time taking away dust and dirt, realizing the self-cleaning effect. Finally, through the self-condensation reaction of the silicon hydroxyl groups produced by the surface hydrolysis of γ-methacryloxypropyl trimethoxysilane, a dense silicon-oxygen network structure coating is formed to perform the sealing layer, thereby preparing the heat-insulating, hydrophobic multi-coating tempered glass.

[0056] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims.

Claims

1. A method for producing heat- insulating tempered glass, characterized by, The preparation steps include: (1) 1.0-6.0 g of dopamine hydrochloride is dissolved in 50 mL of Tris-HCl buffer, stirred until completely dissolved, the stirring speed is 120 rpm, and the stirring time is 30 min; then 0.5-1.5 g of nano-silicon dioxide is added, ultrasonic dispersion is performed for 10-30 min, the ultrasonic power is 100-300 W, then the mixture is stirred at room temperature for 24 h, the stirring speed is 60 rpm, dopamine is self-polymerized on the surface of nano-silicon dioxide to form a core-shell structure; then centrifugal separation is performed, the centrifugal speed is 8000 rpm, the time is 5-10 min, the solid particles are collected after the centrifugal separation is completed, and the solid particles are washed with deionized water for 3 times, finally, drying is performed at 50 ℃ for 6 h, to obtain the core-shell structure particles of nano-silicon dioxide embedded in polydopamine; (2) 10-20 g of epoxy resin is mixed with 20-50 mL of acetone, stirred at a speed of 120 rpm for 30 min, 1.0-3.8 g of the nano-silicon dioxide embedded in polydopamine particles is added, ultrasonic dispersion is performed for 30 min, the power is 300 W, then 1.0-2.0 g of a curing agent is added, stirring is performed at a speed of 120 rpm for 20 min, the mixed coating is coated on the surface of the tempered glass, and curing is performed at 80-120 ℃ for 2 h, to prepare the tempered glass coated with a gradient heat insulation structure coating; (3) the tempered glass coated with the gradient heat insulation structure coating is immersed in dimethyl sulfoxide, the dimethyl sulfoxide needs to completely immerse the tempered glass, room temperature immersion is performed for 10-30 min, the tempered glass is taken out, washed with deionized water for 3 times to remove the residual dimethyl sulfoxide, and drying is performed at 60 ℃ for 1 h, to form a coating surface with a micrometer-level hole structure; then the tempered glass is completely immersed in a nano-titanium dioxide dispersion liquid, ultrasonic treatment is performed for 30 min, the ultrasonic power is 20 kHz-40 kHz, the tempered glass is taken out, and drying is performed at 60 ℃ for 1 h, so that the nano-titanium dioxide is deposited on the coating surface to form a micro-nano double rough structure similar to a lotus leaf surface; (4) 5.0 g of γ-methacryloxypropyl trimethoxysilane is dissolved in 50 mL of an organic solvent, 10 mL of deionized water is added, 0.5-1.5 g of a catalyst is added, stirring is performed at a speed of 120 rpm for 30-150 min, to prepare a γ-methacryloxypropyl trimethoxysilane solution; the tempered glass is immersed in the γ-methacryloxypropyl trimethoxysilane solution, room temperature immersion is performed for 1-3 h, the tempered glass is slowly pulled out, drying is performed at 60 ℃ for 10-30 min, and then curing is performed at 100-120 ℃ for 2 h, to prepare the heat insulation tempered glass.

2. The method of claim 1, wherein the method further comprises, The concentration of the Tris-HCl buffer in step (1) is 10-30 mM.

3. The method of claim 1, wherein the method further comprises, The curing agent in step (2) is 2-methyl imidazole.

4. The method of claim 1, wherein the method further comprises, The coating thickness in step (2) is 80-100 μm.

5. The method of claim 1, wherein the method further comprises, The preparation method of the nano-titanium dioxide dispersion liquid in the step (3) is as follows: 1 g of nano-titanium dioxide, 0.1 g of dispersant and 20 g of deionized water are mixed, and then magnetic stirring is carried out at a speed of 60 rpm for 10-20 min, and then ultrasonic treatment is carried out for 30-60 min by using an ultrasonic device with a power of 200-500 W to obtain the nano-titanium dioxide dispersion liquid.

6. The method of claim 5, wherein the method further comprises, The dispersant is sodium dodecyl sulfate.

7. The method of claim 1, wherein the method further comprises the step of: The organic solvent in the step (4) is ethanol. ​ 8. The method of claim 1, wherein the method further comprises, The catalyst in the step (4) is acetic acid.

9. The method of claim 1, wherein the method further comprises, The speed of the slow pulling in the step (4) is 1-10 cm / min.

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