A mixed-phase glass coating for hot-bending forming and a method for preparing the same

Abstract

The application discloses a mixed-phase glass coating for hot bending forming and a preparation method thereof, and belongs to the technical field of glass coating preparation, and comprises an inorganic composition and an organic carrier; the inorganic composition comprises the following components in percentage by mass: pre-crystalline phase glass powder 15-30%, amorphous phase glass powder 40-65%, color powder 15-30% and sintering inhibitor 2-5%. The mixed-phase glass coating provided by the application controls the crystallization degree of the pre-crystalline phase through the sintering inhibitor during the sintering process, so that a dense crystalline layer is formed on the surface of the coating; the mixed-phase glass coating has stable anti-sticking performance under a wide sintering process, and can guarantee the safety performance of the base glass, and can be applied to the fields of household appliances, automobiles, buildings and photovoltaic glass.

Description

Technical Field

[0001] This invention relates to a mixed-phase glass coating for hot bending and its preparation method, belonging to the field of glass coating technology. Background Technology

[0002] Printed-coated glass is pressed into shape using molds after high-temperature treatment, giving it a specific curvature and shape. It is suitable for use in household appliances, construction, automobiles, and other fields. During the pressing process, it is crucial to ensure that the surface coating separates from the mold as quickly as possible to maintain the glass's shape and ensure high production efficiency.

[0003] During high-temperature sintering, the glass powder softens and binds the color powder and other materials into a dense coating, while simultaneously preventing adhesion to the mold during sintering. Generally, the softening temperature and the degree of crystallization of the coating are the most significant factors affecting its anti-sticking performance. A common approach is to add nucleating agents to the coating to form a dense crystalline phase on the surface, ensuring effective separation between the coating and the mold. However, nucleating agents exhibit strong selectivity for the base glass powder, and their dosage significantly affects the degree of crystallization, influencing the coating's softening temperature, anti-sticking performance, coefficient of thermal expansion, and chemical corrosion resistance to varying degrees, leading to coating performance instability. Therefore, it is necessary to provide a mixed-phase coating with controllable processing and stable performance for hot bending forming. Summary of the Invention

[0004] To address at least one problem in the prior art, the present invention provides a mixed-phase glass coating for hot bending and a method for preparing the same. By adjusting the relative content and composition of each component in the coating, the stability of the glass coating in hot bending is ensured without adding a nucleating agent.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a mixed-phase glass coating for hot bending forming, comprising an inorganic composition and an organic carrier; the inorganic composition, by mass percentage, comprises the following components: 15-30% precrystalline glass powder, 40-65% amorphous glass powder, 15-30% color powder, and 2-5% sintering inhibitor.

[0006] Preferably, the precrystalline glass powder comprises, by mass percentage, the following raw materials: Bi₂O₃ 45-68%, SiO₂ 20-30%, TiO₂ 0.5-2%, B₂O₃ 1-5%, Al₂O₃ 2-4%, La₂O₃ 0.5-1%, MgO 1-3%, ZnO 2-7%, Li₂O 1-3%, Na₂O 0.5-2%, and K₂O 0.5-2%.

[0007] Preferably, the amorphous glass powder comprises, by mass percentage, the following raw materials: Bi₂O₃ 30-55%, SiO₂ 25-35%, TiO₂ 0.5-1%, B₂O₃ 3-11%, Al₂O₃ 0.5-2%, La₂O₃ 0.5-2%, MgO 0.5-1%, ZnO 4-10%, BaO 1-3%, Li₂O 2-4%, Na₂O 2-3%, and K₂O 2-4%.

[0008] Preferably, the sintering inhibitor is one or more of nano-sized talc powder, nano-sized quartz powder, nano-sized alumina powder, nano-sized mica powder, and nano-sized cordierite powder.

[0009] Preferably, the colorant is one or more of copper chromium black, iron chromium black, manganese iron black, and cobalt black.

[0010] Preferably, the precrystalline phase glass powder and the amorphous phase glass powder have a particle size in the micrometer range, such as 0.5~10μm.

[0011] Preferably, during the preparation of the inorganic composition, the precrystalline phase glass powder is mixed and co-milled with a sintering inhibitor.

[0012] Preferably, the preparation process of the precrystalline phase glass powder is as follows: Bi2O3, SiO2, TiO2, B2O3, Al2O3, La2O3, MgO, ZnO, Li2O, Na2O, K2O and other raw materials are mixed evenly according to the above-mentioned raw material mass percentages, calcined at a temperature of 1100~1300℃ for 40~90min, then water-quenched to room temperature, dried, and then heated to 640~670℃ for nucleation for 1~2h, and then heated to 820~850℃ for crystallization for 2~4h, then cooled in the furnace, and pulverized to a particle size of micron to obtain precrystalline phase glass powder.

[0013] Preferably, the preparation process of the amorphous glass powder is as follows: Bi2O3, SiO2, TiO2, B2O3, Al2O3, La2O3, MgO, ZnO, BaO, Li2O, Na2O, K2O and other raw materials are mixed evenly according to the above-mentioned raw material mass percentages, calcined at a temperature of 1100~1300℃ for 40~90min, then quenched with water to room temperature, dried, and pulverized to a particle size of micron to obtain amorphous glass powder.

[0014] Preferably, the preparation process of the inorganic composition is as follows:

[0015] (1) Take each component according to the above component mass percentage, first mix the pre-crystallized glass powder and sintering inhibitor evenly, and ball mill to obtain abrasive I;

[0016] (2) The amorphous glass powder is then ball-milled to obtain abrasive II;

[0017] (3) Then, abrasive I, abrasive II and color powder are ground and mixed evenly by a three-roll mill to obtain an inorganic composition.

[0018] Preferably, the ball milling time in steps (1) and (2) is 1 to 8 hours.

[0019] The present invention also provides a method for preparing a mixed-phase glass coating for hot bending, comprising the following steps:

[0020] Step 1: Add the inorganic composition to the organic carrier and grind it evenly with a three-roll mill to form a glass slurry;

[0021] Step 2: Print the glass paste onto the glass that needs to be hot-bent, dry and cure it, and then sinter it to obtain a mixed-phase glass coating printed on the glass.

[0022] Preferably, the thickness of the mixed-phase glass coating printed on the glass is 10~25μm.

[0023] Preferably, the mass ratio of the inorganic composition to the organic carrier is 1:0.15~0.3.

[0024] Preferably, the organic carrier is a mixture of terpineol, ethylene glycol, acrylic resin, leveling agent and thixotropic agent.

[0025] Another object of the present invention is to apply the above-mentioned mixed-phase glass coating to a hot-bent glass coating.

[0026] The beneficial effects of this invention are:

[0027] 1. The mixed-phase glass coating of the present invention regulates the crystallization degree of the pre-crystalline phase by using a sintering inhibitor during the sintering process, thereby forming a dense crystalline layer on the coating surface. The mixed-phase glass coating has stable anti-sticking properties under a wide range of sintering processes and can ensure the safety performance of the base glass. It can be applied to home appliances, automobiles, buildings and photovoltaic glass and other fields.

[0028] 2. The mixed-phase glass coating of the present invention does not require the addition of a nucleating agent. It achieves the anti-sticking effect through the self-crystallization of pre-crystallized glass powder. The process is simple and controllable and has a wide range of applications.

[0029] 3. The mixed-phase glass coating of the present invention uses commercially available nanomaterials as sintering inhibitors, which are low in cost. Furthermore, the sintering inhibitors have extremely high wettability with precrystalline glass powder and amorphous glass powder, which can ensure that the coating is continuous and uniform after sintering, without stress concentration points, and does not affect the safety performance of the coating.

[0030] 4. The mixed-phase glass coating of the present invention is mixed with an organic carrier and coated on glass. After curing and sintering, it forms a continuous sheet coating with excellent gloss and anti-stick properties. During the high-temperature sintering process, it can ensure effective separation of the coating from the pressing mold. At the same time, it has excellent barrier properties, effectively blocking ultraviolet light. The coating has a low coefficient of thermal expansion and effectively improves the strength of the glass, ensuring the safety performance of the glass. Detailed Implementation

[0031] The following is a clear and complete description of the technical solutions in the implementation of this invention. The described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents, instruments, or components used that do not specify the manufacturer are all conventional products that can be purchased commercially.

[0032] The present invention provides a mixed-phase glass coating for hot bending forming, comprising an inorganic composition and an organic carrier; the inorganic composition, by mass percentage, comprises the following components: 15-30% precrystalline glass powder, 40-65% amorphous glass powder, 15-30% color powder, and 2-5% sintering inhibitor.

[0033] The precrystalline glass powder of the present invention comprises, by mass percentage, the following raw materials: Bi₂O₃ 45~68%, SiO₂ 20~30%, TiO₂ 0.5~2%, B₂O₃ 1~5%, Al₂O₃ 2~4%, La₂O₃ 0.5~1%, MgO 1~3%, ZnO 2~7%, Li₂O 1~3%, Na₂O 0.5~2%, and K₂O 0.5~2%.

[0034] The preparation process of the precrystalline phase glass powder of the present invention is as follows: Bi2O3, SiO2, TiO2, B2O3, Al2O3, La2O3, MgO, ZnO, Li2O, Na2O, K2O and other raw materials are prepared according to the mass percentage of raw materials, mixed evenly, and then fired at a temperature of 1100~1300℃ for 40~90min, then water-quenched to room temperature, dried, and then heated to 640~670℃ for nucleation for 1~2h, and then heated to 820~850℃ for crystallization for 2~4h. After that, it is cooled in the furnace and pulverized to a particle size of micrometers, such as 0.5~10μm, to obtain the precrystalline phase glass powder, which is denoted as phase A.

[0035] The amorphous glass powder of the present invention comprises, by mass percentage, the following raw materials: Bi₂O₃ 30~55%, SiO₂ 25~35%, TiO₂ 0.5~1%, B₂O₃ 3~11%, Al₂O₃ 0.5~2%, La₂O₃ 0.5~2%, MgO 0.5~1%, ZnO 4~10%, BaO 1~3%, Li₂O 2~4%, Na₂O 2~3%, and K₂O 2~4%.

[0036] The preparation process of the amorphous glass powder of the present invention is as follows: Bi2O3, SiO2, TiO2, B2O3, Al2O3, La2O3, MgO, ZnO, BaO, Li2O, Na2O, K2O and other raw materials are mixed evenly according to the mass percentage of raw materials in Table 2 below, calcined at a temperature of 1100~1300℃ for 40~90min, then quenched with water to room temperature, dried, and pulverized to a particle size of micrometers, such as 0.5~10μm, to obtain amorphous glass powder, denoted as B phase.

[0037] The specific process for preparing the inorganic composition of the present invention is as follows:

[0038] (1) Take each component according to the mass percentage (i.e. content) of each component of precrystalline glass powder, amorphous glass powder, sintering inhibitor and color powder. First, mix the precrystalline glass powder (i.e. A phase) and sintering inhibitor evenly, and ball mill for 1~8h to obtain abrasive I.

[0039] (2) The amorphous glass powder (i.e., phase B) is then ball-milled for 1-8 hours to obtain abrasive II;

[0040] (3) Then, abrasive I, abrasive II and color powder are ground and mixed evenly by a three-roll mill to obtain an inorganic composition.

[0041] The color powder used in this invention is one or more of commercially available copper chromium black, iron chromium black, manganese iron black, and cobalt black, with copper chromium black being preferred.

[0042] The sintering inhibitor used in this invention is one or more of the commercially available nano-sized talc powder, nano-sized quartz powder, nano-sized alumina powder, nano-sized mica powder, and nano-sized cordierite powder.

[0043] This invention discloses a method for preparing a mixed-phase glass coating for hot bending, comprising the following steps:

[0044] Step 1: Add the inorganic composition to the organic carrier, with a mass ratio of inorganic composition to organic carrier of 1:0.15~0.3, and grind it evenly with a three-roll mill to form a glass slurry;

[0045] Step 2: Print the glass paste onto the glass to be hot-bent, dry and cure it, and then sinter it to obtain a mixed-phase glass coating printed on the glass with a thickness of 10~25μm.

[0046] Preliminary Example 1: Preparation of Precrystalline Phase Glass Powder

[0047] The preparation process of precrystalline phase glass powder is as follows: Bi2O3, SiO2, TiO2, B2O3, Al2O3, La2O3, MgO, ZnO, Li2O, Na2O, K2O and other raw materials are prepared according to the raw material mass percentages in Table 1 below, mixed evenly, and then fired at 1200℃ for 60 min, then water quenched to room temperature, dried, and then heated to 650℃ for nucleation for 1.5 h, and then heated to 850℃ for crystallization for 3 h. After that, it is cooled in the furnace and crushed to a particle size of micron to obtain precrystalline phase glass powder, which is denoted as phase A.

[0048] Table 1. Raw material mass percentage of precrystalline phase glass powder

[0049]

[0050] Preliminary Example 2: Preparation of Amorphous Phase Glass Powder

[0051] The preparation process of amorphous glass powder is as follows: Bi2O3, SiO2, TiO2, B2O3, Al2O3, La2O3, MgO, ZnO, BaO, Li2O, Na2O, K2O and other raw materials are mixed evenly according to the raw material mass percentage in Table 2 below, calcined at 1200℃ for 60 min, then quenched with water to room temperature, dried, and pulverized to a particle size of micron to obtain amorphous glass powder, denoted as B phase.

[0052] Table 2. Raw material mass percentage of amorphous glass powder

[0053]

[0054] Example: Preparation of Inorganic Compositions

[0055] The specific process for preparing the inorganic composition is as follows:

[0056] (1) Take each component according to the mass percentage (i.e. content) of the three components in Table 3 below. First, mix the pre-crystallized glass powder (i.e. A phase) and sintering inhibitor evenly, and ball mill for 1~8h to obtain abrasive I;

[0057] (2) The amorphous glass powder (i.e., phase B) is then ball-milled for 1-8 hours to obtain abrasive II;

[0058] (3) Then, abrasive I, abrasive II and color powder (copper chromium black) are ground and mixed evenly by a three-roll mill to obtain an inorganic composition.

[0059] Table 3. Component content and process requirements of the inorganic compositions in the examples.

[0060]

[0061] Preparation of comparative inorganic compositions

[0062] The specific process for preparing the inorganic composition is as follows:

[0063] (1) Take each component according to the mass percentage (i.e. content) of the four components in Table 4 below. First, mix the pre-crystallized glass powder (i.e. A phase) and sintering inhibitor evenly, and ball mill for 2 hours to obtain abrasive I.

[0064] Alternatively: ball mill the precrystalline glass powder (i.e., phase A) for 2 hours, ball mill the sintering inhibitor for 2 hours, and then mix them evenly to obtain abrasive I; specific process requirements are shown in Table 4;

[0065] (2) The amorphous glass powder (i.e., phase B) is then ball-milled for 2 hours to obtain abrasive II;

[0066] (3) Then, abrasive I, abrasive II and color powder (copper chromium black) are ground and mixed evenly by a three-roll mill to obtain an inorganic composition;

[0067] The remaining steps are the same as in the example.

[0068] Table 4. Component content and process requirements of inorganic compositions in comparative examples

[0069]

[0070] Preparation of Miscible Glass Coatings (Example)

[0071] Step 1: Add the inorganic composition to the organic carrier (the organic carrier is a mixture of terpineol, ethylene glycol, acrylic resin, leveling agent and thixotropic agent), wherein the mass ratio of the inorganic composition to the organic carrier is 1:0.2, and grind it evenly with a three-roll mill to form a glass slurry;

[0072] Step 2: Print the glass paste onto the glass that needs to be hot-bent, dry and cure it, and then sinter it to obtain a mixed-phase glass coating printed on the glass.

[0073] Based on the above usage examples, the glass pastes prepared with organic carriers in Examples 1-14 and Comparative Examples 1-13 were printed onto flat glass with a thickness of 3 mm, respectively. After curing in a drying oven, they were sintered in a sintering furnace at 620-650°C to form a mixed-phase glass coating (18 μm) printed on the flat glass. Performance tests were then performed.

[0074] 1. Gloss (GU): The coating surface is tested using a gloss meter, and the average value is taken after testing 3 locations;

[0075] 2. Roughness Ra (μm): The coating surface is tested using a roughness tester, and the average value is taken after testing at 3 locations;

[0076] 3. Transmittance T (%): The coating was tested using an optical densitometer, and the average value was taken after testing at 3 locations;

[0077] 4. Coefficient of thermal expansion (CTE × 10) -6 / ℃): After preparing the inorganic compositions obtained in step (3) of Examples 1-14 and Comparative Examples 1-10, test the samples in the temperature range of 50-300℃.

[0078] 5. Bending strength: The glass pastes of Comparative Examples 1-14 and Comparative Examples 1-10 were printed onto the square glass surface after edge grinding. After sintering at 620-650°C, the bending strength of the non-printed surface was tested.

[0079] The test data results for Examples 1-14 are shown in Table 5 below, and the test data results for Comparative Examples 1-13 are shown in Table 6 below.

[0080] Table 5 Performance of Mixed-Phase Glass Coatings in Examples

[0081]

[0082] Table 6 Performance of Comparative Mixed-Phase Glass Coatings

[0083]

[0084] As shown in Tables 5 and 6 above, the coatings prepared in Examples 1-14, by co-milling precrystalline glass powder with sintering inhibitors and controlling the relative content of each component, exhibit stable gloss data and roughness values ​​between 0.6 and 0.8 μm. During high-temperature sintering, the coating can effectively separate from the pressing mold, demonstrating excellent anti-sticking properties. The transmittance is less than 0.3%, effectively blocking visible and ultraviolet light. By precipitating crystals with a small coefficient of thermal expansion, the coefficient of thermal expansion of the coating is controlled at 8.5 × 10⁻⁶. -6 The temperature is below ℃ and the bending strength is not less than 60MPa, ensuring the safety performance of the glass.

[0085] In particular, compared with Examples 11-14, Examples 1-10 further optimized the proportions of each raw material in the precrystalline glass powder (excluding barium oxide) and optimized the proportions of each raw material in the amorphous glass powder (containing a suitable amount of barium oxide). The resulting coating exhibited more stable gloss, a roughness value between 0.65 and 0.75 μm, excellent and suitable anti-adhesion properties, improved the bonding strength between the glass and adhesive in the later stages, a transmittance value below 0.24%, a flexural strength value above 65 MPa, and a coefficient of thermal expansion controlled at 8.4 × 10⁻⁶. -6Below ℃, the mixed-phase glass coatings prepared by the component formulations of Examples 1 to 10 have superior performance and can better improve the safety performance of the glass.

[0086] Comparative Examples 1-11 correspond to Examples 1-10, but the relative content of each component and the preparation process differ, which affects the flexural strength and coefficient of expansion. The other properties of the prepared coatings also differ significantly from those in the examples, as detailed below:

[0087] In Comparative Examples 1, 2, 10, and 11, the content of the introduced precrystalline glass powder was relatively low, or the content of the sintering inhibitor was relatively low. During high-temperature sintering, the low content of the precrystalline glass powder resulted in a weak crystallization ability of the component itself. Even if a large amount of sintering inhibitor was introduced to give the precrystalline phase sufficient time to crystallize, the number of crystals of the precrystalline glass powder was small, resulting in a lower roughness value and worse anti-adhesion performance. With a lower content of sintering inhibitor, even if the content of the precrystalline glass powder was high enough and the number of grains was greater, the grain size was relatively small, which also led to lower roughness and worse anti-adhesion performance. At the same time, the smaller the degree of crystallization, the lower its ability to absorb light and the higher its transmittance.

[0088] In Comparative Example 5, a relatively large amount of precrystalline glass powder was introduced, resulting in a greater degree of crystallization of the coating during high-temperature sintering and a significant increase in its roughness. In Comparative Example 6, the amorphous glass powder showed no tendency to crystallize and played a role in improving sintering. When its amount was small, the presence of sintering inhibitors led to a greater tendency for the precrystalline glass powder to crystallize. Excessive roughness, while ensuring good anti-sticking performance, resulted in a decrease in bonding strength when the glass was bonded to the adhesive in the later stages.

[0089] In Comparative Examples 7 and 8, when the content of pigment was too low, although it could ensure excellent anti-sticking performance, the transmittance was high. When the content of pigment was too high and the sintering inhibitor was too low, the crystallization trend was more obvious. This was mainly because the wettability of pigment to precrystalline glass powder was worse than that of sintering inhibitor to precrystalline glass powder. During the sintering process, when the precrystalline glass powder reached a certain degree of crystallization, the precrystalline glass powder and sintering inhibitor were completely wetted and combined to form a non-porous continuous phase, and its degree of crystallization was weakened. However, the wettability of pigment to precrystalline glass powder was poor. That is, the presence of pigment could promote the crystallization of the precrystalline phase, but it could not effectively block it when the degree of crystallization of the precrystalline phase was sufficient, resulting in excessive crystallization and excessive roughness.

[0090] In Comparative Examples 3, 4 and 9, no sintering inhibitor was introduced during ball milling of the precrystalline glass powder, resulting in the sintering inhibitor not being well dispersed and adsorbed on the surface of the precrystalline glass powder, and the sintering inhibition effect was weak, leading to a lower degree of crystallization of the precrystalline glass powder.

[0091] In Comparative Example 12, the inorganic composition did not contain precrystalline glass powder and showed no tendency to crystallize. It played a role in improving sintering during the sintering process. Even with the presence of sintering inhibitors, it could not crystallize, or only crystallized in trace amounts. Its roughness value was low and its anti-adhesion performance was poor. In Comparative Example 13, the inorganic composition did not contain amorphous glass powder. Due to the presence of sintering inhibitors, the crystallization of the precrystalline glass powder was significant, and the roughness increased dramatically. Although it improved the anti-adhesion performance, it affected the subsequent processing and product performance, and greatly reduced the bonding strength between the glass and the adhesive in the later stage. In addition, it was found that the absence of either precrystalline glass powder or amorphous glass powder in the inorganic composition led to a significant increase in the coefficient of thermal expansion of the coating and a significant decrease in flexural strength.

[0092] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit and essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0093] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mixed-phase glass coating for hot bending, characterized in that, It includes an inorganic composition and an organic carrier; the inorganic composition, by mass percentage, comprises the following components: 15-30% precrystalline glass powder, 40-65% amorphous glass powder, 15-30% colorant, and 2-5% sintering inhibitor; The precrystalline glass powder, by mass percentage, comprises the following raw materials: Bi₂O₃ 45~68%, SiO₂ 20~30%, TiO₂ 0.5~2%, B₂O₃ 1~5%, Al₂O₃ 2~4%, La₂O₃ 0.5~1%, MgO 1~3%, ZnO 2~7%, Li₂O 1~3%, Na₂O 0.5~2%, K₂O 0.5~2%; The amorphous glass powder comprises, by mass percentage, the following raw materials: Bi₂O₃ 30-55%, SiO₂ 25-35%, TiO₂ 0.5-1%, B₂O₃ 3-11%, Al₂O₃ 0.5-2%, La₂O₃ 0.5-2%, MgO 0.5-1%, ZnO 4-10%, BaO 1-3%, Li₂O 2-4%, Na₂O 2-3%, and K₂O 2-4%.

2. The mixed-phase glass coating for hot bending as described in claim 1, characterized in that, The sintering inhibitor is one or more of nano-grade talc powder, nano-grade quartz powder, nano-grade alumina powder, nano-grade mica powder, and nano-grade cordierite powder; the colorant is one or more of copper chromium black, iron chromium black, manganese iron black, and cobalt black.

3. The mixed-phase glass coating for hot bending as described in claim 1, characterized in that, The precrystalline phase glass powder and the amorphous phase glass powder have a particle size in the micrometer range.

4. The mixed-phase glass coating for hot bending as described in claim 1, characterized in that, In the preparation of the inorganic composition, the precrystalline phase glass powder is mixed and co-milled with a sintering inhibitor.

5. A mixed-phase glass coating for hot bending as described in claim 1, characterized in that, The preparation process of the precrystalline phase glass powder is as follows: Bi2O3, SiO2, TiO2, B2O3, Al2O3, La2O3, MgO, ZnO, Li2O, Na2O, and K2O raw materials are mixed evenly according to the above-mentioned raw material mass percentages, calcined at a temperature of 1100~1300℃ for 40~90min, then water-quenched to room temperature, dried, and then heated to 640~670℃ for nucleation for 1~2h, and then heated to 820~850℃ for crystallization for 2~4h. After that, it is cooled in the furnace and pulverized to a particle size of micrometers to obtain precrystalline phase glass powder.

6. The mixed-phase glass coating for hot bending as described in claim 1, characterized in that, The preparation process of the amorphous glass powder is as follows: Bi2O3, SiO2, TiO2, B2O3, Al2O3, La2O3, MgO, ZnO, BaO, Li2O, Na2O, and K2O raw materials are mixed evenly according to the above-mentioned raw material mass percentages, calcined at a temperature of 1100~1300℃ for 40~90min, then quenched with water to room temperature, dried, and pulverized to a particle size of micrometers to obtain amorphous glass powder.

7. The mixed-phase glass coating for hot bending as described in claim 1, characterized in that, The preparation process of the inorganic composition is as follows: (1) Take each component, first mix the precrystalline phase glass powder and sintering inhibitor evenly, and ball mill for 1~8h to obtain abrasive I; (2) The amorphous glass powder is then ball-milled for 1-8 hours to obtain abrasive II; (3) Then, abrasive I, abrasive II and color powder are ground and mixed evenly by a three-roll mill to obtain an inorganic composition.

8. A method for preparing a mixed-phase glass coating for hot bending as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Add the inorganic composition to the organic carrier and grind it evenly with a three-roll mill to form a glass paste; Step 2: Print the glass paste onto the glass to be hot-bent, dry and cure it, and sinter it to obtain a mixed-phase glass coating printed on the glass.

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