Transparent glass ceramic with blue light blocking function and preparation method of transparent glass ceramic

Abstract

The invention relates to glass ceramics, in particular to transparent glass ceramics with a blue light blocking function and a preparation method of the transparent glass ceramics, and the transparent glass ceramics comprise the following components in percentage by weight: 45-65% of SiO2; 10% to 30% of Al2O3; 0 to 15% of MgO; 0 to 15% of ZnO; the transparent glass ceramic with the blue light blocking function has the advantages that the Mohs hardness of the transparent glass ceramic is larger than 6, the light transmittance of the transparent glass ceramic with the thickness of 1 mm is larger than 85%, the blue light blocking rate of the transparent glass ceramic with the blue light blocking function is larger than 30%, and the transparent glass ceramic with the blue light blocking function is high in light transmittance and blue light blocking rate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of glass-ceramics, and particularly refers to a transparent glass-ceramic with blue light blocking and a preparation method thereof. The transparent glass-ceramic with blue light blocking has a Mohs hardness greater than 6, a 1mm thickness transmittance greater than 85%, and a blue light blocking rate greater than 30%, and has high transmittance and high blue light blocking rate. BACKGROUND

[0002] Glass-ceramics refers to a specific composition of base glass with added crystal nucleus agent (or without added crystal nucleus agent), which is subjected to crystallization heat treatment at a certain temperature regime to uniformly precipitate a large number of small crystals in the glass to form a dense microcrystalline phase and a glass phase.

[0003] The existing glass-ceramics, such as CN111018356B, discloses a glass-ceramic with high crystal content, which is characterized in that the crystal phase includes lithium disilicate, petalite, and beta-lithium feldspar; the average crystal size of the glass-ceramic is 70nm-100nm; the crystal quality percentage in the glass-ceramic is 70%-95%; and the formula of the glass-ceramic is: SiO2: 67mol%-80mol%, Al2O3: 2mol%-5mol%, P2O5: 1mol%-4mol%, B2O3: 0mol%-3mol%, ZrO2: 1.5mol%-6mol%, TiO2: 0mol%-1mol%, K2O: 0mol%-1mol%, Na2O: 0mol%-3mol%, Li2O: 12mol%-22mol%, CeO2: 0mol%-0.3mol%, SnO2: 0mol%-0.2mol%, NaCl+Na2CO3+CaCO3: 0.5mol%-1mol%. At this time, the average visible light transmittance of the 1mm thick glass-ceramic is 85%-92%; the surface compressive stress of any face of the glass-ceramic is 300MPa-500MPa; and the tensile stress line density of the glass-ceramic is greater than 30000MPa / mm. The preparation method of the glass-ceramic with high crystal content includes the following steps: S1: melting the glass at a temperature of 1500℃-1600℃ to obtain a base glass with a certain size; S2: placing the base glass obtained in step S1 at a temperature T1 of 500℃-550℃ for heating for 1h-5h, then at a temperature T2 of 550℃-700℃ for heating for 1h-6h, and then at a temperature T3 of 700℃-800℃ for heating for 0-4h; S3: repeating step S2 at least twice to prepare the glass-ceramic. The crystal quality percentage in the glass-ceramic is ensured to be 70%-95%, the performance of the glass-ceramic is improved through the ultra-high crystal quality percentage, the actual production requirements are met, and the practicality of the glass-ceramic is enhanced.

[0004] Furthermore, the light that the eye can perceive is called visible light, which is an electromagnetic wave with a wavelength between 400 and 700 nanometers, including the colors we are familiar with, such as "red, orange, yellow, green, blue, indigo, and purple". Light with a wavelength greater than 700 nanometers is called infrared light, and light with a wavelength less than 400 nanometers is called ultraviolet light. Infrared light and ultraviolet light are usually blocked by the cornea and the lens, and have less effect on the retina. The real impact on the retina is blue light with a wavelength between 400 and 500 nanometers. The main source of blue light is the sun, but in recent years, with the development of semiconductor technology, many 3C products, including flat panel displays, LED neon lights, screen lights, computer monitors, and mobile phone screens, have background light sources. Among the light sources excited by strong electron flow, there is abnormally high-energy blue light. Blue light can help you improve your mood and enhance your awareness, but long-term exposure to blue light at night can reduce the production of melatonin (a hormone that regulates sleep) and disrupt your circadian rhythm. Researchers at Harvard University have linked night shift work and nighttime exposure to blue light to various types of cancer (breast cancer, prostate cancer), diabetes, heart disease, obesity, and the risk of depression. Researchers are not sure why exposure to blue light at night has such a harmful effect on our health, but it is well known that exposure to sunlight suppresses the secretion of melatonin, and lower levels of melatonin may explain the relationship with these health problems. Optometrists have even found high retinal pressure in young people, which can lead to the early onset of macular degeneration, which in extreme cases can lead to near blindness.

[0005] However, existing microcrystalline glass does not have a blue light blocking function, and an anti-blue light film layer needs to be formed on the surface of the microcrystalline glass by pasting or coating. However, after long-term use, the film layer will peel off and fail, and its light transmittance is only about 50%, which is a deficiency. How to add a blue light blocking function to the 3C products with background light sources such as flat panel displays, LED neon lights, screen lights, computer monitors, and mobile phone screens is a difficult problem that the industry needs to overcome. SUMMARY

[0006] The main purpose of the present application is to provide a transparent microcrystalline glass with blue light blocking, which has a weight percentage composition containing 45-65% SiO2; 10-30% Al2O3; 0-15% MgO; 0-15% ZnO; 1-10% TiO2, and it must contain one of MgO or ZnO, and the crystal after heat treatment is spinel microcrystalline glass.

[0007] The transparent microcrystalline glass with blue light blocking function further comprises 0-5% of P2O5, 0-2% of B2O3, 0-5% of ZrO2, 0-2% of Na2O, 0-2% of K2O, 0-2% of Li2O, 0-2% of SnO2 and 0-2% of CeO2.

[0008] The transparent microcrystalline glass with blue light blocking function has a Mohs hardness greater than 6, a 1mm thick transmittance greater than 85% and a blue light blocking rate greater than 30%.

[0009] The preparation method of the transparent microcrystalline glass with blue light blocking function comprises the following steps: S1, raw material preparation: the raw materials are mixed according to the weight percentage to prepare a transparent microcrystalline glass raw material with blue light blocking function; S2, melting: the transparent microcrystalline glass raw material with blue light blocking function is melted into a liquid raw material in a furnace at a high temperature; S3, clarification and defoaming: bubbles and impurities in the liquid raw material are removed; S4, furnace discharge and forming: the liquid raw material is discharged from the furnace and formed; S5, annealing: the formed product is annealed; S6, first stage crystal growth heat treatment: the annealed semi-finished product is subjected to first stage crystal growth heat treatment; S7, second stage crystal growth heat treatment: the first stage crystal growth heat treatment is completed, and then the second stage crystal growth heat treatment is performed; S8, transparent microcrystalline glass with blue light blocking function: the second stage crystal growth heat treatment is completed, and the transparent microcrystalline glass with blue light blocking function is prepared.

[0010] The melting temperature in the S2 step is 1550-1650℃, and the time is 1-8 hours.

[0011] The clarification and defoaming temperature in the S3 step is 1600-1650℃, and the time is 1-8 hours.

[0012] The furnace discharge and forming temperature in the S4 step is 1500-1600℃.

[0013] The annealing temperature in the S5 step is 700-800℃.

[0014] The first stage crystal growth heat treatment temperature in the S6 step is 650-850℃.

[0015] The second stage crystal growth heat treatment temperature in the S7 step is 850-1000℃.

[0016] The application has the following advantages: the preparation method is simple, low in cost and suitable for large-scale production; the transparent microcrystalline glass with blue light blocking has a Mohs hardness greater than 6, a 1mm thick transmittance greater than 85%, and a blue light blocking rate greater than 30%; the transparent microcrystalline glass with blue light blocking has a high blue light blocking rate, and can be widely used in mobile phone protection panels, optical instruments, communication equipment protection mirrors, magnetic sheet substrates, liquid crystal display panels and other optoelectronic device protection mirrors. DETAILED DESCRIPTION

[0017] The application will be further described in conjunction with specific examples, so that those skilled in the art can better understand the application and implement it. The examples are not intended to limit the application.

[0018] The transparent microcrystalline glass with blue light blocking comprises 45-65% of SiO2, 10-30% of Al2O3, 0-15% of MgO, 0-15% of ZnO, and 1-10% of TiO2, and must contain one of MgO and ZnO, and the crystal after heat treatment is spinel microcrystalline glass.

[0019] The transparent microcrystalline glass with blue light blocking further comprises 0-5% of P2O5, 0-2% of B2O3, 0-5% of ZrO2, 0-2% of Na2O, 0-2% of K2O, 0-2% of Li2O, 0-2% of SnO2, and 0-2% of CeO2.

[0020] The transparent microcrystalline glass with blue light blocking has a Mohs hardness greater than 6, a 1mm thick transmittance greater than 85%, and a blue light blocking rate greater than 30%.

[0021] The preparation method of the transparent microcrystalline glass with blue light blocking comprises the following steps: S1: raw material preparation: the raw materials are mixed according to the weight percentage to prepare the transparent microcrystalline glass raw material with blue light blocking; S2: melting: the transparent microcrystalline glass raw material with blue light blocking is melted into liquid raw material in a furnace at high temperature; S3: clarification and defoaming: the bubbles and impurities in the liquid raw material are removed; S4: furnace discharge and shaping: the liquid raw material is discharged from the furnace and shaped; S5: annealing: the shaped product is annealed after being discharged from the furnace. S6 first stage crystal growth heat treatment: the annealed semi-finished product of the previous step is subjected to first stage crystal growth heat treatment; S7 second stage crystal growth heat treatment: the first stage crystal growth heat treatment of the previous step is completed and then subjected to second stage crystal growth heat treatment; S8 complete blue light blocking transparent glass-ceramic: the second stage crystal growth heat treatment of the previous step is completed to obtain the blue light blocking transparent glass-ceramic of the present application.

[0022] The melting temperature of the aforementioned S2 step of the present application is 1550-1650℃, and the time is 1-8 hours. The aforementioned S3 step of the present application is clarified and defoamed at a temperature of 1600-1650℃ for 1-8 hours. The aforementioned S4 step of the present application is formed at a temperature of 1500-1600℃. The aforementioned S5 step of the present application is annealed at a temperature of 700-800℃. The aforementioned S6 step of the present application is subjected to first stage crystal growth heat treatment at a temperature of 650-850℃. The aforementioned S7 step of the present application is subjected to second stage crystal growth heat treatment at a temperature of 850-1000℃.

[0023] The present application has the following advantages: the preparation method used crystallizes and precipitates microcrystals from the glass matrix to prepare a microcrystalline glass with inherent blue light blocking, high transparency and high hardness. The preparation method of the present application is simple, low in cost and suitable for large-scale production. The transparent microcrystalline glass with blue light blocking of the present application has a Mohs hardness greater than 6, a 1mm thick transmittance greater than 85%, and a blue light blocking rate greater than 30%, with high transmittance and high blue light blocking rate. The transparent microcrystalline glass with blue light blocking of the present application has high blue light blocking rate, and can eliminate the lack of blue light blocking function of existing microcrystalline glass, which requires an anti-blue light film layer formed on the surface of the microcrystalline glass by pasting or plating. The transparent microcrystalline glass with blue light blocking of the present application can be widely used in mobile phone protection panels, optical instruments and communication equipment protection mirrors, magnetic sheet substrates, liquid crystal display panels and other optoelectronic device protection mirrors.

[0024] Example 1: First, according to weight percentages, 65.00% SiO2, 14.00% Al2O3, 4.00% MgO, 4.00% ZnO, 4.00% TiO2, 3.00% P2O5, 1.00% B2O3, 1.50% Na2O, 1.50% K2O, 1.00% Li2O, 0.50% SnO2, and 0.50% CeO2 are mixed evenly to form a transparent microcrystalline glass raw material with blue light blocking properties. Then, it is sequentially melted at a temperature of 1550-1650℃ for a time of 1... - An 8-hour melting process, a clarification and defoaming process at a temperature of 1600-1650℃ for 1-8 hours, a furnace forming process at a temperature of 1500-1600℃, an annealing process at a temperature of 700-800℃, a first-stage crystal growth heat treatment at a temperature of 650-850℃, and a second-stage crystal growth heat treatment at a temperature of 850-1000℃, finally producing a transparent microcrystalline glass with a Mohs hardness greater than 6, a light transmittance greater than 85% at a thickness of 1mm, and a blue light blocking rate greater than 30%.

[0025] Example 2: First, 45.00% SiO2, 27.00% Al2O3, 10.00% MgO, 9.50% ZnO, 6.50% TiO2, 1.50% Na2O, and 0.50% CeO2 are mixed evenly according to their weight percentages to form a transparent microcrystalline glass raw material with blue light blocking properties. Then, the raw material undergoes a melting process at a melting temperature of 1550-1650℃ for 1-8 hours, followed by a clarification and defoaming process at a temperature of 1600-1650℃. The process involves a clarification and defoaming step lasting 1-8 hours, followed by furnace forming at 1500-1600℃, annealing at 700-800℃, a first-stage crystal growth heat treatment at 650-850℃, and a second-stage crystal growth heat treatment at 850-1000℃. The result is a transparent microcrystalline glass with a Mohs hardness greater than 6, a light transmittance greater than 85% at a thickness of 1mm, and a blue light blocking rate greater than 50%.

[0026] Example 3: First, according to the weight percentages, 50.00% SiO2, 23.50% Al2O3, 8.50% MgO, 9.00% ZnO, 3.50% TiO2, 2.00% P2O5, 1.50% ZrO2, 1.50% Na2O, and 0.50% CeO2 are mixed evenly to form a transparent microcrystalline glass raw material with blue light blocking properties. Then, it undergoes a melting step at a melting temperature of 1550-1650℃ for 1-8 hours, followed by a clarification and defoaming process. The process involves a clarification and defoaming step at 1600-1650℃ for 1-8 hours, followed by furnace forming at 1500-1600℃, annealing at 700-800℃, a first-stage crystal growth heat treatment at 650-850℃, and a second-stage crystal growth heat treatment at 850-1000℃. The final product is a transparent microcrystalline glass with a Mohs hardness greater than 6, a light transmittance greater than 85% at a thickness of 1mm, and a blue light blocking rate greater than 35%.

[0027] Example 4: First, according to weight percentages, 60.00% SiO2, 13.00% Al2O3, 4.00% MgO, 12.50% ZnO, 2.00% TiO2, 2.50% P2O5, 3.00% ZrO2, 1.50% Na2O, 1.00% Li2O, and 0.50% CeO2 are mixed evenly to form a transparent microcrystalline glass raw material with blue light blocking properties. Then, it undergoes a melting process at a melting temperature of 1550-1650℃ for 1-8 hours. The process involves a clarification and defoaming step at 1600-1650℃ for 1-8 hours, followed by furnace forming at 1500-1600℃, annealing at 700-800℃, a first-stage crystal growth heat treatment at 650-850℃, and a second-stage crystal growth heat treatment at 850-1000℃. The final product is a transparent microcrystalline glass with a Mohs hardness greater than 6, a light transmittance greater than 85% at a thickness of 1mm, and a blue light blocking rate greater than 40%.

[0028] Example 5: First, 53.00% of SiO2, 22.00% of Al2O3, 15.00% of ZnO, 2.00% of TiO2, 2.00% of P2O5, 3.00% of ZrO2, 1.50% of Na2O, 1.00% of Li2O, 0.50% of CeO2 are mixed uniformly to prepare a blue light blocking transparent glass-ceramic raw material according to weight percentage, and then a melting step at a melting temperature of 1550-1650℃ for 1-8 hours, a fining and defoaming step at a fining and defoaming temperature of 1600-1650℃ for 1-8 hours, a furnace-out forming at a temperature of 1500-1600℃, annealing at a temperature of 700-800℃, a first stage of crystal growth heat treatment at a temperature of 650-850℃, a second stage of crystal growth heat treatment at a temperature of 850-1000℃ are sequentially performed, and finally a blue light blocking transparent glass-ceramic with a Mohs hardness greater than 6, a 1mm thick transmittance greater than 85%, and a blue light blocking rate greater than 35% is prepared.

[0029] The above-described embodiments are only preferred embodiments of the present application for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art based on the present application are within the protection scope of the present application. The protection scope of the present application is subject to the claims.

Claims

1. A transparent glass-ceramic with blue light barrier, characterized in that, The weight percentage composition contains 45-65% of SiO2; 10-30% of Al2O3; 0-15% of MgO; 0-15% of ZnO; 1-10% of TiO2, and wherein one of MgO or ZnO must be contained, and the crystal after heat treatment is spinel microcrystalline glass.

2. The transparent glass-ceramic with blue light barrier according to claim 1, characterized in that, The aforementioned transparent microcrystalline glass with blue light blocking further comprises 0-5% of P2O5; 0-2% of B2O3; 0-5% of ZrO2; 0-2% of Na2O; 0-2% of K2O; 0-2% of Li2O; 0-2% of SnO2; 0-2% of CeO2.

3. The transparent glass-ceramic with blue light barrier according to claim 1 or claim 2, characterized in that, The aforementioned transparent microcrystalline glass with blue light blocking has a Mohs hardness greater than 6, a 1mm thick transmittance greater than 85%, and a blue light blocking rate greater than 30%.

4. A method of making a transparent glass-ceramic with blue light barrier, characterized in that, The preparation steps are as follows: S1 raw material preparation: the aforementioned raw materials are mixed and uniformly prepared into a blue light blocking transparent microcrystalline glass raw material according to the aforementioned weight percentage; S2 melting: the aforementioned blue light blocking transparent microcrystalline glass raw material is melted into a liquid raw material in a furnace at a high temperature; S3 clarification and defoaming: bubbles and impurities in the liquid raw material of the previous step are removed; S4 furnace discharge and shaping: the liquid raw material of the previous step is discharged and shaped; S5 annealing: the furnace discharge and shaping of the previous step is annealed; S6 first stage crystal growth heat treatment: the annealed semi-finished product of the previous step is subjected to first stage crystal growth heat treatment; S7 second stage crystal growth heat treatment: the first stage crystal growth heat treatment of the previous step is completed and then subjected to second stage crystal growth heat treatment; S8 complete blue light blocking transparent microcrystalline glass: the second stage crystal growth heat treatment of the previous step is completed to obtain a blue light blocking transparent microcrystalline glass.

5. The method of claim 4, wherein the method further comprises adding a blue light blocking agent to the glass melt. 5 The melting temperature of the aforementioned S2 step is 1550-1650℃, and the time is 1-8 hours.

6. The method of claim 4, wherein the method further comprises adding a blue light blocking agent to the glass melt. 5 The clarification and defoaming temperature of the aforementioned S3 step is 1600-1650℃, and the time is 1-8 hours.

7. The method of claim 4, wherein the method further comprises adding a blue light blocking agent to the glass batch mixture.

8. The method of claim 4, wherein the method further comprises adding a blue light blocking agent to the glass batch mixture. The furnace discharge and shaping temperature of the aforementioned S4 step is 1500-1600℃.

8. The method for preparing transparent microcrystalline glass with blue light blocking as described in claim 4, characterized in that, The annealing temperature of the aforementioned S5 step is 700-800℃.

9. The method for preparing transparent microcrystalline glass with blue light blocking as described in claim 4, characterized in that, The first stage crystal growth heat treatment temperature of the aforementioned S6 step is 650-850℃.

10. The method for preparing transparent microcrystalline glass with blue light blocking as described in claim 4, characterized in that, The second stage crystal growth heat treatment temperature of the aforementioned S7 step is 850-1000℃.