Processing technology of sapphire optical sheet

Abstract

The invention relates to a processing technology of a sapphire optical sheet, in particular to a processing technology of a sapphire optical sheet. Comprising the following steps: cutting: cutting a raw material to obtain a cut sample; coarse grinding: grinding the cut sample by using a grinding liquid containing boron carbide to obtain a coarse grinding product; fine grinding is conducted, specifically, the rough grinding product is ground through grinding liquid containing agglomerated diamond, and a fine grinding product is obtained; and polishing: carrying out polishing treatment on the fine grinding product by adopting a polishing solution containing aluminum oxide to obtain the sapphire optical sheet. The high-hardness boron carbide grinding liquid, the agglomerated diamond grinding liquid and the aluminum oxide polishing liquid are adopted and matched with the production process, so that the surface of the obtained sapphire optical sheet is uniform and smooth, the particle size is smaller than a specific value, the surface roughness is remarkably reduced, and the product quality and the production efficiency are improved.

Description

Technical Field

[0001] The present application relates to a processing technology for a sapphire optical sheet, and in particular to a processing technology for a sapphire optical sheet. Background Art

[0002] As a high-performance transparent material, sapphire optical sheets are widely used in various optical devices, including mobile phone cameras, professional video cameras, cameras, drone lenses, watch mirrors, car cameras, telescopes, and optical systems of optoelectronic instruments. These applications place very high demands on the surface quality and dimensional accuracy of sapphire optical sheets, because any tiny defects may affect the performance and life of the final product. At present, the processing of sapphire optical sheets mainly relies on three methods: mechanical polishing, chemical polishing, and chemical mechanical polishing. Mechanical polishing usually uses abrasive liquid or abrasive powder for rough grinding to remove large-area protrusions and depressions on the surface of the workpiece. Subsequently, finer grinding liquid is used for fine grinding to achieve higher surface smoothness. Chemical polishing uses chemical reagents to react with the sapphire surface to gradually remove the uneven parts of the surface. Chemical mechanical polishing combines the advantages of the above two methods and achieves high-precision surface treatment through the dual effects of physics and chemistry. In actual production, these methods often require multiple repeated operations to achieve the required surface quality. However, there are some shortcomings in the existing sapphire optical sheet processing technology, especially in the environment of continuous mass production, it is difficult to ensure the consistency and accuracy of each grinding and polishing. For example, existing grinding and polishing liquid formulas may cause scratches and surface damage during the grinding process, thus affecting product quality. Therefore, how to improve the processing consistency and stability of sapphire optical sheets has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] The present application solves the problem of surface uniformity of sapphire optical sheets and ensures uniform quality of mass-produced sapphire optical sheets, and provides a processing technology for sapphire optical sheets.

[0004] A processing technology for a sapphire optical sheet comprises the following steps: Cutting: Cut the raw material to obtain cutting samples; Rough grinding: Grind the cutting sample with a grinding fluid containing boron carbide to obtain a rough grinding product; Fine grinding: The coarsely ground product is ground with a grinding liquid containing agglomerated diamonds to obtain a finely ground product; Polishing: The finely ground product is polished with a polishing liquid containing aluminum oxide to obtain a sapphire optical sheet. By adopting the above technical solution, a grinding liquid containing boron carbide, a grinding liquid containing agglomerated diamond, and a polishing liquid containing aluminum oxide are used in sequence for processing, which can effectively remove the hard layer on the surface of the sapphire optical sheet, reduce scratches and surface damage, and maintain a high cutting ability and precise polishing effect. The surface of the sapphire optical sheet finally obtained is uniform and smooth, and the particle size is less than a specific value, which significantly reduces the surface roughness and improves the quality and production efficiency of the product. Preferably, the pressure in the rough grinding process and the fine grinding process is 400-500kg, and the liquid flow rate is 20-25ml / min; the pressure in the polishing process is 650-750kg, and the liquid flow rate is 3.5-4.5L / min. By adopting the above technical solution, it can be ensured that the surface of the obtained sapphire optical sheet is uniform and smooth. During the coarse and fine grinding processes, the pressure is set at 400-500kg and the liquid flow rate is 20-25ml / min to ensure that the grinding liquid works under appropriate conditions, improving the grinding effect while reducing surface damage.

[0005] The pressure set during the polishing process is 650-750kg and the liquid flow rate is 3.5-4.5L / min, ensuring that the polishing liquid can fully contact the workpiece surface, improve the polishing efficiency and surface quality, and finally obtain a sapphire optical sheet with a uniform and smooth surface.

[0006] The surface roughness Ra value of the sapphire optical sheet of the present application obtained by production of the present application is below 0.1 nm. Preferably, the particle size of boron carbide in the grinding liquid containing boron carbide is a, the particle size of agglomerated diamond in the grinding liquid containing agglomerated diamond is b, and the particle size of alumina in the polishing liquid containing alumina is c, and a>b>c. By adopting the above technical scheme, the grinding liquid containing boron carbide, the grinding liquid containing agglomerated diamond and the polishing liquid containing alumina are used for processing in sequence, which can ensure that the surface of the sapphire optical sheet is uniform and smooth. Specifically: grinding liquid containing boron carbide: the high hardness of boron carbide enables it to easily remove the hard layer on the surface of the workpiece, while reducing scratches and surface damage. grinding liquid containing agglomerated diamond: the diamond particles in the agglomerated diamond grinding liquid are treated with a special process, and the agglomerated structure formed increases the number of combined edge angles and the aggregation strength, thereby maintaining a high cutting ability during the grinding process, ensuring a high-precision polishing effect, and making the surface of the sapphire optical sheet polished uniformly.

[0007] Polishing fluid containing aluminum oxide: Aluminum oxide polishing fluid with high removal rate can quickly remove excess material on the workpiece surface and improve polishing efficiency. Aluminum oxide polishing fluid is particularly suitable for polishing sapphire workpieces because it has a similar material structure to sapphire, can provide a uniform polishing effect, significantly reduce surface roughness, make the surface smoother and more delicate, reduce scratches, and protect the integrity of the workpiece surface.

[0008] Therefore, by controlling the particle size relationship (a>b>c), the fineness and smoothness of the surface of the sapphire optical sheet can be further guaranteed, and the overall quality and performance of the product can be improved. Preferably, a non-woven fabric grinding pad is used in the fine grinding process, and a non-woven fabric polishing pad is used in the polishing process. By adopting the above technical solution, the non-woven fabric grinding pad adopts an open grid structure, has good elasticity and adaptability, and can provide a uniform grinding effect during the fine grinding process. This uniformity helps to reduce the unevenness of the workpiece surface and improve the grinding quality. At the same time, the softness and elasticity of the non-woven fabric grinding pad can reduce the scratches generated during the grinding process and protect the integrity of the workpiece surface. It is particularly important for workpieces that require high precision and smooth surfaces. In addition, the non-woven fabric polishing pad can quickly remove scratches, stains and other defects on the workpiece surface, thereby improving the polishing efficiency. The surface quality of the workpiece polished with the non-woven fabric polishing pad is high and the gloss is good, which can meet the requirements of high precision and high quality. Preferably, the non-woven fabric grinding pad is a composite polyurethane non-woven fabric grinding pad; the non-woven fabric polishing pad is a damping cloth polishing pad. By adopting the above technical solution, the composite polyurethane non-woven polishing pad combines the elasticity of polyurethane and the wear resistance of non-woven fabric, and can maintain high strength and wear resistance during long-term use, thereby extending the service life. The good elasticity and flexibility of polyurethane materials can adapt to the surfaces of workpieces with different shapes and curvatures, ensuring the uniformity and consistency of the polishing effect. The surface structure and material design of the composite polyurethane non-woven polishing pad can quickly remove excess material on the surface of the workpiece, improve the efficiency of polishing and grinding, and make the surface quality of the polished workpiece high and the gloss good, which can meet the requirements of high precision and high quality.

[0009] The damping cloth polishing pad has a fine texture, a soft surface, and is covered with small holes, which can effectively accommodate the polishing liquid, making the polishing process more uniform and delicate, thereby obtaining a high-quality polished surface. The damping cloth polishing pad can well absorb the vibration and impact generated during the polishing process, avoid scratching the surface of the workpiece, reduce surface damage, and protect the integrity of the material. In addition, the fine openings on the surface of the damping cloth polishing pad help to fully conserve the polishing liquid, promote the full effect of mechanical and chemical reactions, thereby improving the utilization rate of the polishing liquid and the polishing efficiency. The damping cloth polishing pad also has good durability and stability, can withstand long-term continuous operation without losing its performance, extend its service life, and maintain a stable polishing effect for a long time, reducing the polishing quality problem caused by the degradation of the polishing pad performance. Preferably, the cutting process is specifically: the raw material is cut by a diamond cutting wire, and then combined with a cutting fluid to obtain a cutting sample of the corresponding size. By adopting the above technical solution, the diamond cutting wire has extremely high hardness and wear resistance, so that it can remain sharp for a long time during the cutting process, thereby greatly improving the cutting efficiency, and at the same time, it can also improve the cutting accuracy, so that the cut workpiece size is accurate and the shape is regular. The cutting fluid has the functions of cooling, lubricating and cleaning. Specifically, during the cutting process, the diamond cutting wire will generate a large amount of heat due to high-speed friction, resulting in an increase in the temperature of the cutting area. The cutting fluid can effectively reduce the temperature of the cutting area and prevent the diamond particles from graphitizing due to high temperature, thereby maintaining its hardness and cutting performance. At the same time, the cooling effect can also reduce the impact of thermal stress on the workpiece, avoiding the workpiece from breaking due to thermal deformation or thermal cracks. At the same time, the cutting fluid can wash away the debris and impurities generated in the cutting area and keep the cutting surface clean. This helps to reduce the wear of the particles in the cutting fluid on the diamond cutting wire, and is also conducive to the subsequent processing steps. In addition, the cleaning effect can also prevent the accumulation of debris in the cutting area, avoid scratches or affect the cutting accuracy. Preferably, the grinding fluid containing boron carbide, the grinding fluid containing agglomerated diamonds, and the polishing fluid containing aluminum oxide all contain a dispersion stabilizer. By adopting the above technical solution, the grinding fluid containing boron carbide, the grinding fluid containing agglomerated diamonds, and the polishing fluid containing aluminum oxide all contain a dispersion stabilizer, which can ensure the stability of these liquids during rough grinding, fine grinding and polishing. Dispersing stabilizers have a dispersing and stabilizing effect, which can promote the uniform distribution of boron carbide, agglomerated diamond and aluminum oxide particles, prevent particle agglomeration and sedimentation, and thus improve the consistency and uniformity of the grinding and polishing process. This not only improves the surface quality of sapphire optical sheets, but also ensures the quality stability during mass production.

[0010] Preferably, the dispersion stabilizer is composed of the following raw materials in percentage by weight: Alkyl lactate 13-18% Polyethylene glycol 10-23% Xylan derivatives 5-16% Silicone polyether copolymer 3-8% High molecular weight polymers containing amino and acid groups 5-10% 1-Carboxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt 3-5% The balance is water.

[0011] By adopting the above technical scheme, alkyl lactate has good solubility and dispersibility, which is helpful for the dissolution and dispersion of other components and improves the uniformity and stability of the whole system. Polyethylene glycol, as a commonly used dispersant, can significantly reduce the surface tension of the system, promote the dispersion of particles and the stability of the emulsion. Xylan derivatives interact with other components in the system through their special chemical structure and functional groups, improve the dispersion stability, and have lubricating and thickening effects, improving the fluidity and viscosity of the system. As a high molecular surfactant, silicone polyether copolymer forms an effective interface layer between solid particles and liquids to prevent particle agglomeration and sedimentation, and has high temperature stability and low foaming. High molecular polymers containing amino groups and acid groups interact with other components in the system through functional groups such as amino groups and acid groups, and may act as charge stabilizers, prevent particle agglomeration, and have thickening and rheology regulating effects.

[0012] 1. As an ionic liquid, carboxyethyl-3-methylimidazole bis(trifluoromethanesulfonyl)imide salt has special solubility and dispersibility, which helps dissolve and disperse other components and has a positive effect on the charge state and stability of the system. When alkyl lactate, polyethylene glycol, xylan derivatives, silicone polyether copolymers, polymers containing amino groups and acid groups, and 1-carboxyethyl-3-methylimidazole bis(trifluoromethanesulfonyl)imide salt are compounded, a synergistic effect is produced, which further enhances the performance of the dispersion stabilizer, improves the dispersion efficiency, enhances the stability, and improves the fluidity and viscosity, thereby ensuring the stability and raw material uniformity of the grinding liquid containing boron carbide, the grinding liquid containing agglomerated diamonds, and the polishing liquid containing aluminum oxide in the production process of sapphire optical sheets, further improving the uniformity of the surface of sapphire optical sheets, and ensuring the quality stability of the continuous production process of sapphire optical sheets. Preferably, the alkyl lactate is one or more of methyl lactate, ethyl lactate, and hexadecyl lactate. By adopting the above technical solution, the selection range of alkyl lactate includes one or more of methyl lactate, ethyl lactate, and hexadecyl lactate. These ester compounds have good solubility and dispersibility, can effectively promote the dissolution and dispersion of other components, and improve the uniformity and stability of the entire system.

[0013] Preferably, the xylan derivative is acetylated xylan. By adopting the above technical solution, acetylated xylan, hydroxy polyxylan, and arabinoxylan as xylan derivatives have good dispersing and stabilizing effects. These derivatives interact with other components in the system through their special chemical structure and functional groups, improve the dispersion stability, and improve the fluidity and viscosity of the system.

[0014] In summary, the present application includes at least one of the following beneficial technical effects: 1. The use of high-hardness boron carbide grinding liquid, agglomerated diamond grinding liquid, and aluminum oxide polishing liquid in combination with the production process of this application can effectively remove the hard layer on the surface of the sapphire optical sheet, reduce scratches and surface damage, and maintain a high cutting ability and precise polishing effect. The surface of the sapphire optical sheet finally obtained is uniform and smooth, and the particle size is less than a specific value, which significantly reduces the surface roughness and improves the quality and production efficiency of the product.

[0015] 2. A synergistic effect is produced by compounding alkyl lactate, polyethylene glycol, xylan derivatives, silicone polyether copolymers, high-molecular polymers containing amino groups and acid groups, and 1-carboxyethyl-3-methylimidazole bis(trifluoromethanesulfonyl)imide salt, further enhancing the performance of the dispersion stabilizer, improving the dispersion efficiency, enhancing the stability, and improving the fluidity and viscosity, thereby ensuring the stability of the grinding liquid containing boron carbide, the grinding liquid containing agglomerated diamonds, and the polishing liquid containing aluminum oxide in the production process of sapphire optical sheets and the uniformity of the raw materials, further improving the uniformity of the surface of the sapphire optical sheets, and ensuring the stable quality of the continuous production process of sapphire optical sheets. DETAILED DESCRIPTION

[0016] The present application is further described in detail below with reference to the embodiments.

[0017] Some raw material sources: Hexadecyl lactate is CAS No. 35274-05-6; The number average molecular weight of polyethylene glycol is 200-400; Acetylated xylan refers to a compound formed by replacing the hydroxyl group in the xylan molecule with an acetyl group. Specifically, acetylated xylan is a low-polymer sugar formed by 4 xyloses bonded by -1,4-glycosidic bonds, and then after the substitution reaction, its acetyl content is 1.8-2.1%. Silicone polyether copolymer polymer containing amino and acid groups is a polymer rheology control additive containing amino and acid groups, and its brand model is Lubrizol SOLTHIX 250; 1-Carboxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt has a CAS number of 174899-82-2.

[0018] Preparation Example of Dispersion Stabilizer Preparation Example 1 A dispersion stabilizer is prepared by the following method: According to the weight percentage, 13% of alkyl lactate, 10% of polyethylene glycol, 16% of xylan derivative, 8% of silicone polyether copolymer, 10% of polymer containing amino group and acid group, 5% of 1-carboxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt and 38% of water are weighed and put into a stirring device, and stirred at a speed of 200r / min for 20 minutes to fully mix and obtain a dispersion stabilizer. Among them, the alkyl lactate is methyl lactate; the xylan derivative is acetylated xylan.

[0019] Preparation Example 2-3 The difference between Preparation Example 2-3 and Preparation Example 1 is that the amount of raw materials used is different, as shown in Table 1: Table 1 Amount of raw materials used in Preparation Examples 1-3 (weight percentage %) Preparation Example 4 Preparation Example 4 is different from Preparation Example 2 in that the alkyl lactate is composed of methyl lactate and hexadecyl lactate in a weight ratio of 1:1.

[0020] Preparation Comparative Example Preparation Comparative Example 1 The difference between Preparation Comparative Example 1 and Preparation Example 1 is that alkyl lactate, xylan derivative, silicone polyether copolymer, high molecular weight polymer containing amino groups and acid groups, and 1-carboxyethyl-3-methylimidazole bis(trifluoromethanesulfonyl)imide salt are replaced by polyethylene glycol in equal amounts.

[0021] Preparation Comparative Example 2 The difference between Preparation Comparative Example 2 and Preparation Example 1 is that an equal amount of alkyl lactate is replaced by polyethylene glycol.

[0022] Preparation Comparative Example 3 The difference between Preparation Comparative Example 3 and Preparation Example 1 is that an equal amount of the xylan derivative is replaced by polyethylene glycol.

[0023] Preparation Comparative Example 4 The difference between Preparation Comparative Example 4 and Preparation Example 1 is that an equal amount of the xylan derivative is replaced by 1-carboxyethyl-3-methylimidazole bis(trifluoromethanesulfonyl)imide salt. Example

[0024] Example 1 A sapphire optical sheet is prepared by the following method: Cutting: Put the raw material into the cutting device and cut it with diamond cutting wire, and then use cutting fluid to obtain a cutting sample with a size of 60*55*0.3mm; Rough grinding: The cutting sample is transferred to the first grinding device, and the grinding process is carried out with a grinding liquid containing boron carbide for 30 minutes to obtain a rough grinding product; Fine grinding: The coarsely ground product is transferred to the second grinding equipment, and the grinding process is carried out with grinding liquid containing agglomerated diamonds for 30 minutes to obtain a finely ground product; Polishing: The finely ground product is transferred to the polishing equipment and polished with a polishing liquid containing aluminum oxide for 2 hours. It is then washed with clean water, the surface moisture is air-dried, and then packaged to obtain sapphire optical sheets.

[0025] The pressure during the rough grinding and fine grinding process is 400kg, and the liquid flow rate is 25ml / min; the pressure during the polishing process is 750kg, and the liquid flow rate is 3.5L / min; The particle size of boron carbide in the grinding liquid containing boron carbide is a, the particle size of agglomerated diamond in the grinding liquid containing agglomerated diamond is b, and the particle size of alumina in the polishing liquid containing alumina is c, a>b>c; wherein, the particle size of boron silicide is 2-5 microns, the particle size of agglomerated diamond is 0.01-1 micron, and the particle size of alumina is 10-100nm.

[0026] A cast iron disc is used in the rough grinding process; a non-woven fabric grinding pad is used in the fine grinding process, and a non-woven fabric polishing pad is used in the polishing process; the non-woven fabric grinding pad is a composite polyurethane non-woven fabric grinding pad; and the non-woven fabric polishing pad is a damping fabric polishing pad.

[0027] The number of pieces produced in continuous production for this application: 100 pieces.

[0028] The boron carbide-containing polishing liquid is composed of boron silicide, polishing liquid (model HS-300 from Shenzhen Huayi Technology Co., Ltd.), and water in a weight ratio of 0.1:10:180.

[0029] The agglomerated diamond-containing grinding fluid is composed of agglomerated diamond, grinding fluid (model HS-300 from Shenzhen Huayi Technology Co., Ltd.), and water in a weight ratio of 0.1:10:200.

[0030] The polishing liquid containing aluminum oxide is composed of aluminum oxide, polishing liquid (model XH2010YYRNTG of Hangzhou Jiupeng New Materials Co., Ltd.), and water in a weight ratio of 0.01:10:100.

[0031] Example 2 The difference between Example 2 and Example 1 is that the process parameters are different, as follows: The pressure during the coarse grinding and fine grinding processes is 450kg, and the liquid flow rate is 22ml / min; the pressure during the polishing process is 700kg, and the liquid flow rate is 4L / min.

[0032] Example 3 The difference between Example 3 and Example 1 is that the process parameters are different, as follows: The pressure during the coarse grinding and fine grinding processes is 500kg, and the liquid flow rate is 20ml / min; the pressure during the polishing process is 650kg, and the liquid flow rate is 4.5L / min.

[0033] Example 4 The difference between Example 4 and Example 1 is that the boron carbide-containing grinding liquid contains 2 wt % of the dispersion stabilizer obtained in Preparation Example 1.

[0034] Example 5 The difference between Example 5 and Example 4 is that the grinding liquid containing agglomerated diamond contains 1.8 wt % of the dispersion stabilizer obtained in Preparation Example 1.

[0035] Example 6 The difference between Example 6 and Example 5 is that the polishing liquid containing aluminum oxide contains 1.5 wt % of the dispersion stabilizer obtained in Preparation Example 1.

[0036] Embodiment 7-13 The difference between Examples 7-13 and Example 6 is that the sources of the dispersion stabilizer are different, as shown in Table 2; Table 2 Sources of dispersion stabilizers of Examples 6-13 Example Source of dispersion stabilizer Example 6 Preparation Example 1 Example 7 Preparation Example 2 Example 8 Preparation Example 3 Example 9 Preparation Example 4 Example 10 Preparation Comparative Example 1 Embodiment 11 Preparation Comparative Example 2 Example 12 Preparation Comparative Example 3 Embodiment 13 Preparation Comparative Example 4 Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the boron nitride in the boron carbide-containing polishing liquid is replaced by polydiamond.

[0037] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the agglomerated diamond in the agglomerated diamond-containing grinding liquid is replaced by boron nitride.

[0038] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the pressure during the coarse grinding process and the fine grinding process is 350 kg.

[0039] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the agglomerated diamond particle size in the agglomerated diamond grinding liquid and the silicon oxide particle size in the silicon oxide-containing polishing liquid are the same.

[0040] Performance testing Detection method / test method The sapphire optical sheets obtained in Examples 1-13 and Comparative Examples 1-4 were subjected to the following tests.

[0041] For each group of samples, take 5 samples, and take the transmittance of any three points on each sample for testing. The tested light wavelength is 308nm. The average difference of the three points is calculated by the average difference formula, which is recorded as the average difference A. The sum of the average difference A of the 5 samples is taken, and then divided by 5 to get the average A1; then the average difference A of the 5 samples is obtained, and the average difference is calculated by the average difference formula, which is recorded as the average difference B.

[0042] The specific data of the above experiments are shown in Table 3; Table 3 Experimental data of Examples 1-13 and Comparative Examples 1-4 Experimental items Average A1 Mean difference B Example 1 1.83 0.85 Example 2 1.78 0.81 Example 3 1.88 0.92 Example 4 1.56 0.68 Example 5 1.52 0.62 Example 6 0.32 0.19 Example 7 0.28 0.11 Example 8 0.35 0.22 Example 9 0.20 0.15 Example 10 1.21 0.53 Embodiment 11 1.08 0.42 Example 12 1.03 0.47 Embodiment 13 1.05 0.31 Comparative Example 1 2.23 1.58 Comparative Example 2 2.12 1.24 Comparative Example 3 2.08 1.18 Comparative Example 4 2.01 1.66 From Example 1 and Comparative Examples 1-4 and Table 3, it can be seen that the average A1 in Comparative Examples 1-4 is greater than 2 and the average difference B is higher than 1, while the average A1 of Example 1 is as low as 1.83 and the average difference B is as low as 0.85, indicating that the production process and parameter selection of the present application are better, and the obtained sapphire optical sheet has a uniform surface and stable quality after mass production.

[0043] Combining Example 5 and Example 6 with Table 3, it can be seen that the average A1 in Example 5 is greater than 1.5 and the average difference B is higher than 0.6, while the average A1 in Example 6 is as low as 0.32 and the average difference B is as low as 0.19, indicating that the dispersion stabilizer is obtained by using alkyl lactate, polyethylene glycol, xylan derivative, silicone polyether copolymer, high molecular polymer containing amino groups and acid groups, 1-carboxyethyl-3-methylimidazole bis(trifluoromethanesulfonyl)imide salt and water, and then used in the grinding liquid containing boron carbide, the grinding liquid containing agglomerated diamond, and the polishing liquid containing aluminum oxide, respectively, which can promote the uniformity of the dispersion of the raw material system, ensure stability during the production process, improve the uniformity of the surface of the sapphire optical sheet, and ensure the quality stability of the continuous production process of the sapphire optical sheet.

[0044] Combining Example 6 with Examples 11-13 and Table 3, it can be seen that the average A1 in Example 5 is greater than 1 and the average difference B is higher than 0.31, while the average A1 in Example 6 is as low as 0.32 and the average difference B is as low as 0.19, indicating that the compounding of alkyl lactate, polyethylene glycol, xylan derivative, silicone polyether copolymer, high molecular polymer containing amino groups and acid groups, and 1-carboxyethyl-3-methylimidazole bis(trifluoromethanesulfonyl)imide salt has a synergistic effect, further improves the uniformity of the sapphire optical sheet surface, and ensures the stable quality of the continuous production process of sapphire optical sheets.

[0045] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A processing technology for a sapphire optical sheet, characterized in that: The following steps are involved: Cutting: Cut the raw material to obtain cutting samples; Rough grinding: Grind the cutting sample with a grinding fluid containing boron carbide to obtain a rough grinding product; Fine grinding: The coarsely ground product is ground with a grinding liquid containing agglomerated diamonds to obtain a finely ground product; Polishing: The finely ground product is polished using a polishing liquid containing aluminum oxide to obtain a sapphire optical sheet.

2. The processing technology of a sapphire optical sheet according to claim 1, characterized in that: The pressure during the coarse grinding process and the fine grinding process is 400-500 kg, and the liquid flow rate is 20-25 ml / min; the pressure during the polishing process is 650-750 kg, and the liquid flow rate is 3.5-4.5 L / min.

3. The processing technology of a sapphire optical sheet according to claim 1, characterized in that: The particle size of boron carbide in the grinding liquid containing boron carbide is a, the particle size of agglomerated diamond in the grinding liquid containing agglomerated diamond is b, and the particle size of aluminum oxide in the polishing liquid containing aluminum oxide is c, and a>b>c.

4. The processing technology of a sapphire optical sheet according to claim 1, characterized in that: A non-woven fabric grinding pad is used in the fine grinding process, and a non-woven fabric polishing pad is used in the polishing process.

5. The processing technology of a sapphire optical sheet according to claim 4, characterized in that: The non-woven fabric grinding pad is a composite polyurethane non-woven fabric grinding pad; and the non-woven fabric polishing pad is a damping fabric polishing pad.

6. The processing technology of a sapphire optical sheet according to claim 1, characterized in that: The cutting process is specifically as follows: the raw material is cut by a diamond cutting wire, and then a cutting fluid is used to obtain a cutting sample of corresponding size.

7. A process for processing a sapphire optical sheet according to any one of claims 1 to 6, characterized in that: The grinding liquid containing boron carbide, the grinding liquid containing agglomerated diamonds and the polishing liquid containing aluminum oxide all contain a dispersion stabilizer.

8. The processing technology of a sapphire optical sheet according to claim 4, characterized in that: The dispersion stabilizer is composed of the following raw materials in percentage by weight: Alkyl lactate 13-18% Polyethylene glycol 10-23% Xylan derivatives 5-16% Silicone polyether copolymer 3-8% High molecular weight polymer containing amino and acid groups 5-10% 1-Carboxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt 3-5% The balance is water.

9. The process for processing a sapphire optical sheet according to claim 1, characterized in that: The alkyl lactate is one or more of methyl lactate, ethyl lactate and hexadecyl lactate.

10. The processing technology of a sapphire optical sheet according to claim 1, characterized in that: The xylan derivative is acetylated xylan.

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