CN113372010A

CN113372010A - Glass cover plate, preparation method thereof and electronic equipment

Info

Publication number: CN113372010A
Application number: CN202110747724.2A
Authority: CN
Inventors: 向前飞; 王伟; 许仁; 李可峰; 余承智
Original assignee: VDL Industry Shenzhen Co Ltd
Current assignee: VDL Industry Shenzhen Co Ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2021-09-10

Abstract

The invention relates to a glass cover plate, a preparation method thereof and electronic equipment. The preparation method of the glass cover plate comprises the steps of coating ink on the surface of a glass substrate, drying the surface of the glass substrate, repeating the coating step and the drying step for n times, sintering the glass substrate under a specific condition to obtain the glass substrate with the ink layer, and then performing toughening treatment on the glass substrate with the ink layer to obtain the glass cover plate. Wherein, the temperature control program of the sintering step comprises: stage I; sintering at 400-700 deg.c for 30-180 min; and stage II: preserving the heat for 30min to 200min at the temperature of 500 ℃ to 750 ℃; n is an integer greater than or equal to 0. The glass cover plate prepared by the preparation method has the advantages of ink layer decoration, stable chemical property, high surface hardness and wear resistance.

Description

Glass cover plate, preparation method thereof and electronic equipment

Technical Field

The invention relates to the technical field of glass cover plate preparation, in particular to a glass cover plate, a preparation method thereof and electronic equipment.

Background

At present, the mainstream material of the protective cover plate of the electronic equipment is glass, an inner decoration process is usually adopted for preparing the glass cover plate, an ink decoration layer is arranged on one surface of the glass cover plate, which is in contact with a device, the inner surface is called, and by utilizing the good permeability of the glass, a user can see the decoration effect presented by the ink layer through the outer surface of the glass.

However, the traditional internal decoration process can only be applied to decoration of simple curved glass, complex curved glass such as four-curved glass or double-curved glass has strict requirements on decoration process conditions, and when the traditional internal decoration process is applied to preparation of a complex curved glass cover plate, the application of a decoration mode is limited by the shape of the glass, the decoration effect is affected, and the development of the glass cover plate is greatly limited. The skilled person tries to decorate the outer surface of the glass, for example, the outer surface of the glass is coated with a hard film by a coating process, so that the glass cover plate has a good visual effect and a frosted hand feeling. However, the glass surface is easily scratched during the coating process, resulting in a decrease in the mechanical properties of the resulting glass cover plate.

Therefore, how to develop a preparation method of the glass cover plate which can be decorated by the ink layer and can keep excellent mechanical properties is of great significance.

Disclosure of Invention

Based on the method, the glass cover plate with the ink layer decoration and the excellent mechanical property can be manufactured.

The technical scheme of the invention is as follows.

One aspect of the present invention provides a method for manufacturing a glass cover plate, comprising the steps of:

coating ink on the surface of an untempered glass substrate, drying the surface of the untempered glass substrate, repeating the coating step and the drying step for n times, and then sintering to obtain the glass substrate with the ink layer;

tempering the glass substrate with the ink layer to obtain a glass cover plate;

wherein, the temperature control program of the sintering step comprises:

stage I: sintering at 400-700 deg.c for 30-180 min;

and stage II: sintering at 500-880 deg.c for 30-120 min; the sintering temperature of the stage I is lower than that of the stage II;

n is an integer greater than or equal to 0.

In some of these embodiments, the sintering temperature difference between stage i and stage ii is no less than 200 ℃ and no greater than 600 ℃.

In some embodiments, when the glass substrate is 2D glass or 2.5D glass, after the sintering step and before the tempering step, a step of hot bending the sintered glass substrate is further included, and the glass cover plate is a 3D glass cover plate.

In some of these embodiments, the conditions for the hot roll forming are: performing hot bending treatment at 680-880 ℃ for 30-200 min.

In some of these embodiments, the thickness of the ink applied per application step is 15 μm to 60 μm. In some of these embodiments, the ink is a glazed glass ink.

In some of these embodiments, the step of tempering employs chemical tempering.

Another aspect of the present invention provides a glass cover plate, which is manufactured by the method for manufacturing a glass cover plate as claimed in the above.

The invention also provides electronic equipment comprising the glass cover plate.

Advantageous effects

According to the preparation method of the glass cover plate, the surface of a glass substrate is coated with the ink, the surface is dried, the coating step and the surface drying step are repeated for n times, then sintering is carried out under specific conditions to obtain the glass substrate with the ink layer, and then the glass substrate with the ink layer is subjected to toughening treatment to obtain the glass cover plate. Wherein, the temperature control program of the sintering step comprises: stage I: sintering at 400-700 deg.c for 30-180 min; and stage II: sintering at 500-880 deg.c for 30-200 min; and the sintering temperature of the stage I is controlled to be lower than that of the stage II; n is an integer greater than or equal to 0. The surface-dried ink is sintered under specific conditions, so that the ink layer and the glass substrate are tightly combined to form a hard ink layer which is solidified on the surface of the glass substrate, then the sintered glass substrate is toughened, the ink layer and the glass substrate are toughened together, and the wear-resistant glass cover plate which is decorated by the ink layer, stable in chemical property, high in surface hardness and capable of being manufactured by decorating common colored glaze glass ink.

Furthermore, in the method, the limitation of the shape of the glass substrate on the external decoration mode is small, the ink coating mode can be selected from various modes, such as silk screen printing, transfer printing, spraying, printing and the like, and the coating mode can be used for coating for multiple times in one mode or can be used in combination of multiple coating modes. The printing ink can be overlapped layer by layer and matched with various colors. The patterns after coating have various and complex forms, including effects of gradual change, multi-layer colors and the like, different complex shapes can be manufactured, and the manufacturing precision can reach the precision below +/-0.1 mm. The outer decorative pattern can be made into different rows according to the design requirement, thereby having special touch.

The invention also provides the glass cover plate prepared by the preparation method of the glass cover plate, and the glass cover plate has stable chemical properties, high surface hardness, wear resistance, ink layer decoration, concave-convex frosted hand feeling and complex and variable visual effects.

The invention also provides electronic equipment comprising the glass cover plate. The electronic equipment has high surface hardness, is wear-resistant, has concave-convex frosted hand feeling, and can present complicated and changeable visual effects.

Drawings

FIG. 1 is a photograph of a glass cover plate obtained in example 1.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the conventional art, when the glass cover plate is prepared, the decorative layer is arranged on the inner surface of the glass cover plate contacted with a device, and the user can see the decorative effect presented by the ink layer through the outer surface of the glass by utilizing the good permeability of the glass. However, the traditional internal decoration process can only be applied to decoration of simple curved glass, and when the traditional internal decoration process is applied to preparation of a complex curved glass cover plate, the shape of the glass can limit the application of a decoration mode, so that the decoration effect is influenced, and the development of the glass cover plate is greatly limited. The skilled person tries to decorate the outer surface of the glass, for example, to coat a hard film on the outer surface of the glass by a coating process, so that the glass cover plate has a good visual effect and a frosted hand feeling. However, the surface of the glass is easily scratched, and the glass is easily damaged in the coating process, so that the mechanical property of the prepared glass cover plate is reduced, and the coating process is complex and high in cost.

Moreover, in the attempt of decoration on the outer surface of the glass, those skilled in the art generally need to improve the basic colored glaze glass ink by adding additional glass frit, sintering and then tempering, thereby improving the bending fracture performance of the glass.

Based on this, after a lot of creative research, the technicians of the present invention developed a method for manufacturing a glass cover plate decorated by common colored glaze glass ink and maintaining excellent mechanical properties.

One embodiment of the present invention provides a method for manufacturing a glass cover plate, including the following steps S10 to S20.

Step S10, coating ink on the surface of the glass substrate, drying the surface of the glass substrate, repeating the coating step and the drying step for n times, and then sintering to obtain the glass substrate with the ink layer; wherein, the temperature control program of the sintering step comprises:

stage I: sintering at 400-700 deg.c for 30-180 min;

and stage II: sintering at 500-880 deg.c for 30-200 min; the sintering temperature of the stage I is lower than that of the stage II; n is an integer greater than or equal to 0.

And step S20, tempering the glass substrate with the ink layer obtained in the step S10 to obtain the glass cover plate.

In the preparation method of the glass cover plate, firstly, the surface of the glass substrate is coated with the printing ink and dried, the coating step and the surface drying step are repeated for n times, then, the glass substrate with the printing ink layer is obtained by sintering under specific conditions, and then, the glass substrate with the printing ink layer is subjected to toughening treatment, so that the glass cover plate is obtained. Sintering the surface-dried ink under a specific condition to enable the ink layer to be tightly combined with glass to form a hard ink layer which is solidified on the surface of a glass substrate, and then toughening the sintered glass to enable the prepared glass cover plate to be stable in chemical property, high in surface hardness and wear-resistant, and meanwhile, the sintered hard ink has a certain thickness and has a concave-convex frosted hand feeling; meanwhile, the prepared glass cover plate can present complicated and changeable visual effects through ink collocation and pattern design.

In step S10, the glass with dried surface is sintered for 30-180 min at 400-700 ℃ to remove organic matters in the ink, and then is insulated for 30-120 min at 500-750 ℃ to be completely sintered with the glass, the ink is tightly combined with the glass, and a hard ink layer is formed and is solidified on the surface of the glass substrate.

In some embodiments, the sintering temperature difference between stage i and stage ii is not less than 200 ℃ and not more than 600 ℃ in step S10.

Further, in step S10, the difference between the sintering temperatures of stage i and stage ii is not less than 200 ℃ and not more than 400 ℃.

Preferably, in step S10, the difference between the sintering temperatures of stage i and stage ii is not less than 30 ℃ and not more than 100 ℃.

Under the specific sintering condition, in the stage I, organic matters in the ink and oxygen in the environment are subjected to oxidation reaction to generate volatile matters, so that the organic matters in the ink are removed, and impurities which can influence the performance of the ink are not left; further in stage II, the ink layer and the glass substrate are further sintered and tightly combined to form a hard ink layer which is fixedly connected on the surface of the glass substrate.

In some of these embodiments, in step S10, the condition of the step of tack-free is: drying at 150-200 deg.c for 30-60 min.

In some of these embodiments, when n is an integer greater than or equal to 1, the conditions for each coating step are the same or different; the conditions for each run of the tack-free step may be the same or different.

It is understood that when n is an integer of 1 or more, the conditions for each coating step may be the same or different, i.e., the thickness of the applied ink layer, the type of ink used may be the same or different, and may be selected according to the actually desired decorative pattern. The conditions for each run of the tack-free step may be the same or different.

Further, the thickness of the ink applied in each application step is 15 μm to 60 μm. Further, when n is an integer greater than or equal to 1, the thickness of the coating layer can be made not less than 60 μm by the ink stack, and a complex decorative pattern with a certain thickness can be obtained by adjusting the color of the ink used in each coating step, so that the glass cover plate manufactured has both visual effect and hand feeling.

It will be appreciated that each layer of ink applied requires surface drying, and that after the desired thickness of the coating has been achieved, the surface dried glass is sintered.

In some embodiments, in step S10, the ink is a colored glaze glass ink.

The color of the ink can be single or multiple, and can be adjusted according to actual requirements.

Further, in step S10, the coating step is implemented by silk-screen printing, spraying or printing.

In some embodiments, the glass substrate is 2D glass, 2.5D glass, or 3D glass.

It is understood that the glass substrate may be selected from non-tempered 2D glass, non-tempered 2.5D glass, or non-tempered 3D glass, and a 2D glass cover plate, a 2.5D glass cover plate, or a 3D glass cover plate may be obtained, respectively.

Further, when the glass substrate is 2D glass, 2.5D glass or 3D glass, the temperature control procedure of the sintering step is as follows:

stage I: sintering at 400-700 deg.c for 30-180 min;

and stage II: sintering at 500-750 deg.c for 30-120 min.

In some embodiments, when the glass substrate is 2D or 2.5D glass, after the sintering step and before the chemical tempering step, a step of performing hot bending on the sintered glass is further included, and the glass cover plate is a 3D glass cover plate. Further, the temperature control program of the sintering step is as follows: stage I: sintering at 400-700 deg.c for 30-180 min; and stage II: sintering at 600-880 deg.c for 30-120 min.

When the glass substrate is 2D or 2.5D glass, a step of hot bending may be added after the step of sintering and before the step of chemical tempering treatment, so as to make the 2D or 2.5D glass into 3D glass, and the obtained glass cover plate is a 3D glass cover plate, so that a 3D glass cover plate with a complex curved surface can be made. Such as a large curved 3D glass cover plate.

In some of these embodiments, the conditions for hot roll forming are: hot bending at 680-880 deg.c for 30-200 min

It is understood that when the temperature of the hot-bending process overlaps with the temperature of the sintering step stage ii in step S10, the hot-bending process may be considered to be performed simultaneously with the sintering.

In some embodiments, the side coated with the ink layer is subjected to hot bending forming to form the convex surface.

Further, the hot bending forming step is carried out in a hot bending forming machine, and the forming is carried out in a pressurizing or hot sucking mode.

In some embodiments, the glass substrate has a thickness of 0.1mm to 3.0mm in step S10.

In some embodiments, in step S20, the tempering step employs chemical tempering.

The chemical tempering is to place the glass in molten alkali salt to exchange the ions in the surface layer of the glass with the ions in the molten salt, and because of the volume change after the exchange, the pressure stress is formed on the two surfaces of the glass and the tensile stress is formed inside the glass, thereby achieving the effect of improving the strength of the glass. When the glass cover plate with the thickness of less than 1.0mm is prepared, the purpose of forming stress difference is difficult to achieve through rapid cooling, and chemical tempering is basically adopted.

Furthermore, when the ink is the colored glaze glass ink, the ink can be chemically toughened to provide an ion exchange protective channel, and the toughening effect of the ink layer and the glass can be ensured to be consistent, so that the mechanical property of the glass cover plate is improved.

In some embodiments, after the sintering step and before the tempering step, the method further comprises a step of post-treating the sintered glass substrate; the post-treatment step includes at least one of polishing, sandblasting, and etching.

Polishing can increase the surface finish of the ink layer; the sand blasting or etching can change the permeability of the surface of the printing ink layer and increase the matte.

It should be noted that, when the manufacturing process includes the above-mentioned hot-roll forming step, the post-treatment step is performed after the above-mentioned hot-roll forming step and before the tempering step.

In some embodiments, after the post-treatment step and before the tempering step, the method further comprises a step of cleaning the glass.

The cleaning step is carried out under the ultrasonic condition, the ultrasonic frequency is 10 KHz-95 KHz, and the ultrasonic time is 0.5 h-3 h.

In some embodiments, step S20 is further performed by plating a film on the tempered glass after the tempering step. And further, coating a film on the surface of the tempered glass ink layer.

It can be understood that according to the requirement of practical application, the surface of the tempered glass ink layer is coated with a film to coat a functional film, such as an anti-fingerprint film, an anti-static film, etc.

The invention further provides a glass cover plate, which is prepared by adopting the preparation method of the glass cover plate.

The glass cover plate is stable in chemical property, high in surface hardness, wear-resistant, capable of achieving concave-convex frosted handfeel and capable of presenting complex and changeable visual effects.

Further, the invention also provides an electronic device comprising the glass cover plate.

The electronic equipment has high surface hardness, is wear-resistant, has a concave-convex frosted hand feeling, and can present a complicated and changeable visual effect.

In some embodiments, in the above electronic device, the glass cover plate serves as a protective rear cover of the electronic device, and the side of the glass cover plate having the ink layer serves as an outer surface of the protective rear cover.

The electronic equipment includes, but is not limited to, a mobile phone, a tablet computer, a digital camera, a GPS, various self-service terminal products, an ATM machine, a jukebox, and the like.

While the present invention will be described with respect to particular embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover by the appended claims the scope of the invention, and that certain changes in the embodiments of the invention will be suggested to those skilled in the art and are intended to be covered by the appended claims.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The following are specific examples.

Example 1

1) Cutting a large piece of incoming glass with the thickness of 0.7mm into glass sheets with the sizes of 163.22mm multiplied by 79.37 mm; and finally, putting the polished glass sheet into a cleaning machine to be cleaned, and obtaining the glass sheet base material.

2) Silk-screen printing is carried out on one surface of the glass sheet base material obtained in the step 1) by using glaze color printing ink, and the thickness of a coating is 10 mu m; then placing the coating into an oven, baking the coating at 180 ℃ for surface drying for 30min, silk-screening a second layer of printing ink, and performing surface drying, wherein the silk-screening and the surface drying are performed layer by layer in such a way that the total thickness of the coating reaches 60 mu m; and then transferring the surface-dried glass into a high-temperature oven for sintering: baking at 500 deg.C for 30min to volatilize organic components in the ink completely, heating to 620 deg.C, and baking for 60min to obtain glass with ink layer and concave-convex hand feeling.

3) Polishing the surface of the ink layer of the glass with the ink layer obtained in the step 2), increasing the surface smoothness, then putting the glass into a cleaning machine for cleaning, then carrying out chemical toughening on the cleaned glass, wherein the toughening agent adopted in the toughening step is potassium nitrate, the toughening temperature is 420 ℃, and the toughening time is 200 min. And then placing the toughened glass in a cleaning machine to clean, and finally plating a layer of anti-fingerprint film to obtain the 2D glass cover plate. As shown in particular in figure 1.

4) Testing the performance of the glass cover plate prepared in the step 3); the reliability of the ink layer on the glass cover plate is tested, and the test comprises high temperature and high humidity resistance, UV illumination resistance, salt spray resistance, cold and hot shock resistance and other environment tests.

The specific test methods of the high temperature and high humidity resistance, the UV illumination resistance, the salt spray resistance test, the thermal shock resistance and the buffer test are respectively as follows:

the specific conditions of the high temperature and high humidity resistance test are as follows: 60 ℃, 90% RH humidity, 72 hours; the time of the UV light irradiation test is 72 hours; the specific conditions of the salt spray resistance test are as follows: 5 wt% NaCl salt spray, 35 degrees C test 8 hours and 16H hours; the specific conditions of the buffer test were: pH 4.6 buffer for 48 hours. No change in ink occurred. The specific test results are shown in table 1. The results show that: the ink layer on the glass cover plate prepared in the example 1 has good high temperature and high humidity resistance, UV illumination resistance, salt spray resistance test and cold and hot shock resistance.

Testing the mechanical properties of the glass cover plate prepared in the step 3), including a wear resistance test, a bending property test and an impact property test, wherein the specific test methods are respectively as follows:

and (3) wear resistance test: bending performance test at 1kg pressure: adopting a four-point bending test method and an impact performance test: a ball drop test was performed using 60g of steel balls.

Wherein, wear-resisting test, bending property test and impact property test have tested 3 groups, 9 groups and 9 groups respectively, and 10 glass apron have all been tested to every group, calculate the average value. The results show that: the four-point bending performance of the 2D glass cover plate prepared in the embodiment 1 is not less than 500MP, the impact performance reaches 60g/40CM and above, and the 2D glass cover plate is resistant to abrasion for 1000g/3000 times and has no ink drop. The test results were averaged and the specific test results are shown in table 2.

Example 2

2) Silk-screen printing is carried out on one surface of the glass sheet base material obtained in the step 1) by using glaze color printing ink, and the thickness of the printing ink layer is 10 mu m; then placing the coating into an oven, baking the coating at 180 ℃ for surface drying for 30min, silk-screening a second layer of printing ink, and performing surface drying, wherein the silk-screening and the surface drying are performed layer by layer in such a way that the total thickness of the coating reaches 60 mu m; and transferring the dried glass into a high-temperature oven, baking for 30min at 500 ℃ to fully volatilize organic matter components in the printing ink, heating to 620 ℃ for heat preservation and baking for 60min to completely sinter the glaze color printing ink and the glass on the surface of the glass to obtain the glass with the printing ink layer, and performing sand blasting and etching on the printing ink layer to ensure that the printing ink layer has a certain thickness, has a concave-convex hand feeling and has an opaque matte light sensation.

3) Cleaning the glass with the ink layer obtained in the step 2) in a cleaning machine, and then chemically toughening the cleaned glass, wherein the toughening agent adopted in the toughening step is potassium nitrate, the toughening temperature is (420 ℃, and the toughening time is 200 min). And then placing the toughened glass in a cleaning machine to clean, and finally plating a layer of anti-fingerprint film to obtain the 2D glass cover plate.

4) The performance of the glass cover plate prepared in the step 3) is tested, the testing steps are the same as those of the step 4) in the example 1, and the specific testing results are shown in tables 1 and 2. The results show that: the ink layer on the glass cover plate prepared in the example 1 has good high temperature and high humidity resistance, UV illumination resistance, salt spray resistance test and cold and hot shock resistance. The four-point bending performance of the 2D glass cover plate prepared in the embodiment 2 is not less than 500MP, the impact performance reaches 60g/40CM and above, ink does not drop under the condition of abrasion resistance for 1000g/3000 times, and the mechanical standard of the 2D glass cover plate is reached.

Example 3

1) Cutting a large piece of incoming glass with the thickness of 0.7mm into glass sheets with the sizes of 163.22mm multiplied by 79.37 mm; and then, finely carving the glass sheet to obtain 2.5D glass with a preset shape, polishing and side polishing the front and back surfaces of the 2.5D glass, and finally, putting the polished glass sheet into a cleaning machine to clean, so as to obtain a glass sheet base material.

2) Silk-screen printing is carried out on one surface of the glass sheet base material obtained in the step 1) by using glaze color printing ink, and the thickness of the printing ink layer is 10 mu m; then placing the mixture into an oven, baking the mixture at 180 ℃ for surface drying for 30min, then carrying out silk-screen printing on a second layer of printing ink, and carrying out surface drying, wherein the silk-screen printing and the surface drying are carried out layer by layer in such a way, so that the total thickness of the printing ink reaches 60 mu m; and then transferring the glass with the dried surface into a high-temperature oven, sintering at 500 ℃ for 30min to fully volatilize organic matter components in the ink and completely sinter, then sintering in a hot bending furnace at 780-800 ℃ for 200min, and simultaneously performing pressure hot bending molding, wherein the convex surface is the surface with the ink layer, so as to obtain the glass with the ink layer.

3) Carrying out sand blasting and etching on the surface of the ink layer of the glass with the ink layer obtained in the step 2), then putting the glass into a cleaning machine to clean, and then carrying out chemical toughening on the cleaned glass, wherein a toughening agent adopted in the toughening step is potassium nitrate, the toughening temperature is 420 ℃, and the toughening time is 200 min. And then placing the toughened glass in a cleaning machine to clean, and finally plating a layer of anti-fingerprint film to obtain the 3D glass cover plate.

4) Testing the performance of the glass cover plate prepared in the step 3); the reliability of the ink layer on the glass cover plate is tested, and the test results include high temperature and high humidity resistance, UV illumination resistance, salt spray resistance, cold and heat impact resistance and other environment tests are shown in table 1. The results show that: the ink layer on the glass cover plate prepared in the example 1 has good high temperature and high humidity resistance, UV illumination resistance, salt spray resistance test and cold and hot shock resistance.

And (3) testing the mechanical properties of the glass cover plate prepared in the step 3), including wear resistance testing, bending property testing and impact property testing. Wherein, wear resistance test, bending property test and impact property test have been tested 3 respectively, 10 combination 10 groups, and the test result is the average value. The specific test results are shown in table 2. The result shows that the four-point bending performance of the 3D glass cover plate prepared in the embodiment 3 is not less than 400MP, the impact performance reaches 60g/15CM and above, the ink does not drop under the condition of resisting the wear for 1000g/3000 times, and the mechanical standard of the 3D glass cover plate is reached.

Example 4

Example 4 is essentially the same as example 1, except that: in the step 2), the conditions of the surface drying step are as follows: baking at 200 deg.C for 45 min.

The rest of the steps and process conditions are the same as in example 1, and the specific test results are shown in tables 1 and 2.

Example 5

Example 5 is essentially the same as example 1, except that: the conditions of the sintering step in the step 3) are as follows: baking at 600 deg.C for 90min to volatilize organic components in the ink, heating to 650 deg.C, and baking for 90 min.

Example 6

Example 6 is essentially the same as example 1, except that: the conditions of the sintering step in the step 3) are as follows: baking at 700 deg.C for 120min to volatilize organic components in the ink completely, heating to 750 deg.C, baking for 60min,

Example 7

Example 7 is essentially the same as example 1, except that: the conditions of the sintering step in the step 3) are as follows: baking at 600 deg.C for 180min to volatilize organic components in the ink, heating to 650 deg.C, and baking for 30 min.

Example 8

Example 8 is essentially the same as example 1, except that: the conditions of the sintering step in the step 3) are as follows: baking at 650 deg.C for 80min to volatilize organic components in the ink, heating to 680 deg.C, and baking for 30 min.

Example 9

Example 9 is essentially the same as example 1, except that: in the step 2), the conditions of the surface drying step are as follows: baking at 150 deg.C for 60 min.

Comparative example 1

Comparative example 1 is substantially the same as example 1 except that: the conditions of the sintering step in the step 3) are as follows: baking at 350 deg.C for 30min to volatilize organic components in the ink, heating to 620 deg.C, and baking for 60 min.

Comparative example 2

Comparative example 1 is substantially the same as example 1 except that: the conditions of the sintering step in the step 3) are as follows: directly placing at 800 deg.C, and baking for 90 min.

Comparative example 3

1) Cutting a large piece of incoming glass with the thickness of 0.7mm into glass sheets with the sizes of 163.22mm multiplied by 79.37 mm; and finally, polishing and side polishing the front and back surfaces of the 2D glass, cleaning the polished glass sheet in a cleaning machine, chemically toughening the cleaned glass, wherein a toughening agent adopted in the toughening step is potassium nitrate, the toughening temperature is 420 ℃, and the toughening time is 300min, so that the glass sheet base material is obtained.

2) Same as in step 2) of example 1.

3) Polishing the surface of the ink layer of the glass with the ink layer obtained in the step 2), increasing the surface smoothness, and then putting the glass into a cleaning machine to clean, so as to obtain the 2D glass cover plate.

4) The same as example 1, step 4), see tables 1 and 2 for the specific test results.

Comparative example 4

Comparative example 1 is substantially the same as example 1 except that: and 3) transferring the surface-dried glass into a high-temperature oven, sintering at 500 ℃ for 30min to fully volatilize organic matter components in the ink and completely sinter, and then sintering in a hot bending furnace at 780-800 ℃ for 3 min.

TABLE 1

The specific conditions of the high-temperature and high-humidity resistance test are as follows: 60 ℃, 90% RH humidity, 72 hours; the time of the UV light irradiation test is 72 hours; the specific conditions of the salt spray resistance test are as follows: 5 wt% NaCl salt spray, 35 degrees C test 8 hours and 16H hours; the specific conditions of the buffer test were: pH 4.6 buffer for 48 hours.

TABLE 2

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The preparation method of the glass cover plate is characterized by comprising the following steps:

coating ink on the surface of an untempered glass substrate, drying the surface of the untempered glass substrate, repeating the coating step and the drying step for n times, and then sintering to obtain the glass substrate with the ink layer; tempering the glass substrate with the ink layer to obtain a glass cover plate;

wherein, the temperature control program of the sintering step comprises:

stage I: sintering at 400-700 deg.c for 30-180 min;

and stage II: sintering at 500-880 deg.c for 30-200 min; the sintering temperature of the stage I is lower than that of the stage II;

n is an integer greater than or equal to 0.

2. The method for producing a glass cover plate according to claim 1, wherein the condition of the surface drying step is: drying at 150-200 deg.c for 30-60 min.

3. The method for producing a glass cover plate according to claim 2, wherein the difference between the sintering temperatures of the stage i and the stage ii is not less than 200 ℃ and not more than 600 ℃.

4. The method for manufacturing a glass cover plate according to claim 1, wherein when the glass substrate is 2D glass or 2.5D glass, after the step of sintering and before the step of tempering, the method further comprises a step of subjecting the sintered glass substrate to hot bending, and the glass cover plate manufactured is a 3D glass cover plate.

5. The method for producing a glass cover plate according to claim 4, wherein the conditions for the hot-bending are: performing hot bending treatment at 680-880 ℃ for 30-200 min.

6. The method for manufacturing a glass cover plate according to any one of claims 1 to 5, wherein the thickness of the ink applied in each application step is 15 μm to 60 μm.

7. The method for manufacturing a glass cover plate according to any one of claims 1 to 5, wherein the tempering treatment step is chemical tempering.

8. The method for manufacturing a glass cover plate according to any one of claims 1 to 5, wherein the ink is a colored glaze glass ink.

9. A glass cover plate produced by the method for producing a glass cover plate according to any one of claims 1 to 8.

10. An electronic device comprising the glass cover plate of claim 9.