A boron nitride polishing liquid and a method for preparing the same

Abstract

The application relates to the technical field of grinding, in particular to a boron nitride grinding liquid and a preparation method thereof. The boron nitride grinding liquid comprises the following preparation raw materials in parts by mass: modified boron nitride 18-22 parts, a suspension synergist 2-3 parts, a stabilizer 3-4 parts, a dispersing agent 1-2 parts, an accelerator 3-5 parts, nano particles 0.1-0.2 parts and a solvent 60-65 parts, wherein the suspension synergist is prepared by mixing isododecanic acid and ricinoleic acid. The boron nitride grinding liquid has the advantages that the abrasive still maintains good suspension under long-time shearing action, has long cycle life and high grinding efficiency; the grinding liquid has excellent dispersion effect, can effectively disperse the nano particles generated in the grinding process, avoids adsorption to the abrasive surface, avoids generation of agglomerated large particles and reduces scratches generated in the grinding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grinding, in particular to a boron nitride grinding liquid and a preparation method thereof. BACKGROUND

[0002] Grinding of hard materials such as resin lenses is carried out by grinding discs. The grinding process requires continuous injection of grinding liquid into the grinding disc. The quality of the grinding liquid is a major factor affecting the grinding effect. Currently, the grinding liquid used for grinding resin lenses mainly uses large-particle boron carbide, silicon carbide or diamond powder as the grinding agent, and adds a certain proportion of water and a dispersing agent. The dispersing agent has poor dispersing effect and is prone to sedimentation. The grinding efficiency is also not high, and the service life of the cycle is short. In the grinding process, the liquid film on the grinding disc is not evenly dispersed, the grinding lubricity is insufficient, the grinding rate is low, and the particles after grinding are prone to agglomeration, causing scratching and high Ra. SUMMARY

[0003] The present application aims to overcome the shortcomings of the current technology and provide a boron nitride grinding liquid and a preparation method thereof. The boron nitride grinding liquid of the present application still maintains good suspension under long-time shearing action, has a long service life and high grinding efficiency. The grinding liquid of the present application has excellent dispersing effect, can effectively disperse the nanoparticles generated during the grinding process, avoid adsorption to the surface of the abrasive, avoid the generation of agglomerated large particles, and reduce the scratching generated during grinding. Therefore, the grinding liquid of the present application has the advantages of shear resistance, high suspension, high dispersion, high efficiency, and good application prospect and large-scale industrialization potential.

[0004] In a first aspect, the present application provides a boron nitride grinding liquid, which adopts the following technical solution:

[0005] A boron nitride grinding liquid, comprising the following preparation raw materials in mass fraction: modified boron nitride 18-22 parts, suspension synergist 2-3 parts, stabilizer 3-4 parts, dispersing agent 1-2 parts, accelerator 3-5 parts, nanoparticles 0.1-0.2 parts, and solvent 60-65 parts, wherein the suspension synergist is prepared by mixing isomeric dodecanoic acid and ricinoleic acid.

[0006] By adopting the above technical scheme, the modified boron nitride, as one of the main components of the polishing liquid, provides basic grinding capacity. Through modification by γ-glycidyloxypropyltrimethoxysilane, the dispersion phase and compatibility of the modified boron nitride in the polishing liquid are improved, thereby ensuring the dispersion degree and stability of the polishing liquid. The suspension synergist is prepared by mixing isomeric dodecanoic acid and castor oil acid, and is used to improve the suspension and dispersion of the abrasive, and to enhance the flowability and shear resistance of the polishing liquid. The stabilizer is used to form a stable polishing liquid system, to improve the high suspension and dispersion of the polishing liquid, and to help the stable dispersion of nanoparticles. The dispersant is used to reduce the viscosity of the polishing liquid, to improve the spreading flowability of the polishing liquid on the polishing disc, to ensure uniform stress on the resin lens, and to reduce the roughness and scratches after polishing. The accelerator promotes the dispersion and stability of nanoparticles in the polishing liquid, and avoids agglomeration and reduces scratches by strong electrostatic action. The nanoparticles are embedded in the microcracks of the resin lens, form a splitting effect, increase the grinding efficiency, avoid agglomeration and reduce scratches by strong electrostatic action, and reduce the surface roughness Ra after polishing. The solvent provides a medium environment for the polishing liquid, ensures the effective dissolution and dispersion of other components, and affects the viscosity and flowability of the polishing liquid. These components improve the overall performance of the polishing liquid through synergistic effect. The modified boron nitride provides the grinding basis, the suspension synergist and the stabilizer improve the suspension and dispersion of the abrasive, the dispersant and the accelerator further optimize the flowability and grinding efficiency of the polishing liquid, and the nanoparticles enhance the grinding capacity and surface quality of the polishing liquid through their special effect. The interaction of these components ensures that the polishing liquid still maintains good suspension and dispersion under long-time shearing action, and improves the grinding efficiency and reduces the polishing cost.

[0007] Preferably, the mass fraction ratio of the isomeric dodecanoic acid and the castor oil acid is 3:1.

[0008] Preferably, the preparation method of the modified boron nitride is as follows: 6-8 parts of γ-glycidyloxypropyltrimethoxysilane, 200 parts of ethanol, and 300 parts of water are uniformly mixed, 450-500 parts of boron nitride with an average particle size of 10-30 microns is added, stirred for 5-7 hours, heated to 75°C, refluxed for 60 minutes, filtered, and dried to obtain the modified boron nitride.

[0009] By adopting the above technical scheme, the boron nitride is modified by γ-glycidyloxypropyltrimethoxysilane, which improves the dispersion phase and compatibility of the boron nitride in the polishing liquid, thereby obtaining a boron nitride polishing liquid with good dispersion degree, stability, and prolonged shelf life.

[0010] Preferably, the stabilizer is prepared by mixing amphoteric surfactant and fatty alcohol polyoxyethylene ether AEO3 in a mass fraction ratio of 4:3.

[0011] By adopting the technical scheme, the stabilizer in the application mainly plays a role in improving the stability of the grinding solution, avoiding agglomeration and precipitation, and thus ensuring that the abrasive can maintain a good suspended state during the grinding process. At the same time, the stabilizer also helps to reduce the viscosity of the grinding liquid, improve its spreading fluidity on the grinding disc, make the resin lens bear force uniformly, reduce the surface roughness Ra after grinding, and reduce scratches generated during grinding. The synergistic effect between the amphoteric surfactant and the fatty alcohol polyoxyethylene ether AEO3 mainly reflects in the following aspects: 1. improving the stability of the grinding liquid: the amphoteric surfactant and the fatty alcohol polyoxyethylene ether AEO3 together can enhance the stability of the grinding liquid, reduce the occurrence of agglomeration and precipitation, and thus ensure that the abrasive can maintain a good suspended state during the grinding process. 2. reducing the viscosity of the grinding liquid: the fatty alcohol polyoxyethylene ether AEO3 has a low surface tension, which can effectively reduce the viscosity of the grinding liquid and improve its spreading fluidity on the grinding disc. The amphoteric surfactant can further reduce the surface tension of the grinding liquid and enhance its fluidity, so that the resin lens bears force more uniformly, reduces the surface roughness Ra after grinding, and reduces scratches generated during grinding. 3. improving the dispersibility of the grinding liquid: the amphoteric surfactant and the fatty alcohol polyoxyethylene ether AEO3 together can enhance the dispersibility of the grinding liquid, so that the nanoparticles form a stable double electric layer in the solvent and avoid agglomeration. At the same time, these two substances can also modify the nanoparticles, improve their surface charge, and further improve the dispersibility of the nanoparticles in the grinding liquid to ensure that they always remain in a dispersed state during the circulation of the grinding liquid. In summary, the amphoteric surfactant and the fatty alcohol polyoxyethylene ether AEO3 in the stabilizer have a synergistic effect, which together improves the stability, dispersibility and fluidity of the grinding liquid, reduces the viscosity and surface tension of the grinding liquid, and thus ensures the efficiency and stability of the boron nitride grinding liquid in the resin lens rough grinding process.

[0012] Preferably, the preparation method of the amphoteric surfactant comprises the following steps:

[0013] S51, under nitrogen protection, 21.34g of dodecyl dimethyl tertiary amine is added to the reactor, then 30mL of isopropyl alcohol is added as a solvent, after stirring at 25℃ for 4-5min, 6.46g of 1,3-dichloro-2-propanol is added, the reaction system is heated to 70℃ after mixing uniformly, and reacts for 8-10h. After the reaction is completed, the solvent is removed by rotary evaporation, and recrystallization is performed 3 times using a mixed solvent of ethyl acetate / anhydrous ethanol, the volume ratio of ethyl acetate to anhydrous ethanol is 15:1, and a white solid is obtained;

[0014] S52, under nitrogen protection, 22.24g white solid is mixed with 30mL dichloromethane at 25℃ and added into the reactor, then 5.60g chlorosulfonic acid is mixed with 20mL dichloromethane and slowly added into the reactor, after 5h reaction, saturated aqueous solution of NaOH is slowly added to adjust pH to 9-10, after neutralization, the solvent is removed by rotary evaporation, refluxed in ethanol for 0.5h, inorganic salt is removed by filtration, and recrystallized with acetone for 3 times to obtain the amphoteric surfactant.

[0015] By adopting the technical scheme, the amphoteric surfactant with sulfate group on the linking group is synthesized by taking dodecyl dimethyl tertiary amine, 1,3-dichloro-2-propanol and chlorosulfonic acid as raw materials. The surfactant has amphoteric groups and can simultaneously adsorb anions and cations, so that the boron nitride grinding fluid forms a stable system, and the grinding fluid has high suspension and high dispersion. At the same time, the nanoparticles can be modified, the surface charge of the nanoparticles is improved, the dispersion of the nanoparticles in the grinding fluid is improved, and agglomeration is avoided, and the dispersion is maintained during the circulation of the grinding fluid.

[0016] Preferably, the dispersant is prepared by mixing glyceryl-3-distearate and dehydrated hexaglycerol dioleate in a mass ratio of 1:2.

[0017] By adopting the technical scheme, glyceryl-3-distearate and dehydrated hexaglycerol dioleate as dispersants play a crucial role in the boron nitride grinding fluid. Through mixing, these two substances form an efficient dispersion system, making the grinding fluid have excellent dispersion performance. First, the mixed use of glyceryl-3-distearate and dehydrated hexaglycerol dioleate enhances the stability of the grinding fluid. These two substances can effectively prevent the agglomeration of abrasives during grinding, ensuring uniform distribution of abrasives in the solvent and thus improving grinding efficiency. Second, the synergistic effect between these two substances further improves the dispersion of the grinding fluid. The mixture of glyceryl-3-distearate and dehydrated hexaglycerol dioleate makes the nanoparticles form a more stable double electric layer in the solvent, effectively preventing adsorption and agglomeration between nanoparticles, so that the grinding fluid always maintains good dispersion during circulation. In addition, these two substances also help to reduce the viscosity of the grinding fluid, improving its spreadability on the grinding disc. This makes the resin lens receive more uniform stress during grinding, thereby reducing the surface roughness Ra after grinding and reducing the occurrence of scratches. In summary, glyceryl-3-distearate and dehydrated hexaglycerol dioleate play an important role in the boron nitride grinding fluid. Through their synergistic effect, they improve the stability, dispersion and flowability of the grinding fluid, thereby ensuring the efficiency and stability of the boron nitride grinding fluid in the rough grinding process of the resin lens.

[0018] Preferably, the accelerator is prepared by mixing polyethylene glycol, polyurethane and polyacrylate in a mass ratio of 1:1:2.

[0019] By adopting the above technical solution, the accelerator is prepared by mixing polyethylene glycol, polyurethane and polyacrylate in a mass ratio of 1:1:2, which plays an important role in the boron nitride grinding liquid. The use of these three substances can effectively improve the speed and efficiency of the grinding process. First, the synergistic effect of polyethylene glycol, polyurethane and polyacrylate makes the grinding liquid have stronger reactivity in the grinding process. This accelerator can promote the chemical reaction between the abrasive and the resin lens, improve the grinding speed, and thus shorten the grinding time. Second, the use of these three substances can effectively reduce the energy consumption in the grinding process. By optimizing the grinding conditions, the grinding process is more energy-efficient and cost-effective. Finally, the use of the accelerator can also improve the stability and service life of the grinding liquid. During long-term use, the accelerator can maintain the performance stability of the grinding liquid, avoiding the problem of poor grinding effect caused by performance degradation. In summary, the accelerator prepared by mixing polyethylene glycol, polyurethane and polyacrylate in a mass ratio of 1:1:2 plays an important role in the boron nitride grinding liquid. Through their synergistic effect, the reactivity, energy efficiency and stability of the grinding liquid are improved, ensuring the efficiency and economy of the boron nitride grinding liquid in the resin lens rough grinding process.

[0020] Preferably, the nanoparticles are nano-zirconium oxide with a particle size of 20-40 nanometers.

[0021] Preferably, the solvent is prepared by mixing ethylene glycol and deionized water in a mass ratio of 5:2.

[0022] In a second aspect, the application provides a preparation method of a boron nitride grinding liquid, which adopts the following technical solution:

[0023] As a general technical concept, the application also provides the above-mentioned preparation method of a boron nitride grinding liquid, which includes the following steps:

[0024] S101, according to the mass fraction, the solvent, the stabilizer, the dispersant and the suspension synergist are sequentially added to the stirred tank, heated to 4050℃, and stirred and mixed uniformly to prepare solution A;

[0025] S102, according to the mass fraction, the nanoparticles and the accelerator are sequentially added to solution A, stirred for 0.5-1h under the condition of 100r / min stirring, and then the modified boron nitride is added and stirred for 1-2h to prepare the boron nitride grinding liquid.

[0026] In summary, the beneficial technical effects of the application are:

[0027] 1. High suspension and high dispersion: The synergistic effect of modified boron nitride, suspension synergist, stabilizer, dispersant and accelerator in the polishing liquid can maintain good suspension of the abrasive under long-time shearing action, avoid nanoparticle agglomeration, and improve polishing efficiency.

[0028] 2. Shear resistance and high efficiency: The structural design of the polishing liquid has high static, high viscosity and shear thinning characteristics, which improves the suspension, flowability and shear resistance of large-size abrasives in the system, thereby improving the grinding efficiency and prolonging the service life of the polishing liquid.

[0029] 3. Reduce polishing cost: By optimizing the composition and proportion of the polishing liquid, the scratch and roughness in the polishing process are reduced, thereby reducing the subsequent processing cost.

[0030] 4. Improve polishing quality: The use of dispersants and stabilizers, as well as the introduction of nanoparticles, together improve the dispersion and stability of the polishing liquid, making the stress on the resin lens more uniform, reducing the surface roughness and scratches after polishing, and improving the polishing quality.

[0031] 5. Prolong the shelf life: The modification of modified boron nitride improves its dispersion phase and compatibility in the polishing liquid, making the polishing liquid have a good shelf life.

[0032] 6. Environmental protection and economy: The composition and preparation method of the polishing liquid consider environmental protection and economy, reduce environmental pollution, and reduce production cost, which has good industrialization potential. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only for illustration of the present application and should not be regarded as limiting the scope of the present application. The specific conditions are not specified in the examples, which are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not specified by the manufacturer, which are conventional products that can be purchased on the market.

[0034] In the following examples and preparation examples, 1 part represents 1 kg.

[0035] Preparation Example 1 Preparation of modified boron nitride

[0036] The preparation method of modified boron nitride is as follows: 7 parts of γ-glycidoxypropyltrimethoxysilane, 200 parts of ethanol and 300 parts of water are mixed uniformly, then 480 parts of boron nitride with an average particle size of 15 microns is added and stirred for 6 hours, heated to 75°C, refluxed for 60 minutes, filtered, and dried to obtain modified boron nitride.

[0037] Preparation Example 2 Preparation of amphoteric surfactant

[0038] The preparation method of the amphoteric surfactant comprises the following steps:

[0039] S51, under the protection of nitrogen, 21.34 g of dodecyl dimethyl tertiary amine is added into a reactor, then 30 mL of isopropyl alcohol is added as a solvent, after stirring at 25 DEG C for 5 min, 6.46 g of 1, 3-dichloro-2-propanol is added, after mixing, the reaction system is heated to 70 DEG C and reacted for 10 h, after the reaction is completed, the solvent is removed by rotary evaporation, and recrystallization is carried out 3 times using an ethyl acetate / anhydrous ethanol mixed solvent, the volume ratio of the ethyl acetate / anhydrous ethanol mixed solvent is 15:1, and a white solid is obtained;

[0040] S52, under the protection of nitrogen, 22.24 g of the white solid is mixed with 30 mL of dichloromethane at 25 DEG C and added into a reactor, then 5.60 g of chlorosulfonic acid is mixed with 20 mL of dichloromethane and slowly added into the reactor, after reaction for 5 h, saturated aqueous NaOH solution is slowly added to adjust the pH to 10, after neutralization is completed, the solvent is removed by rotary evaporation, refluxing in ethanol for 0.5 h, inorganic salts are removed by filtration, and recrystallization is carried out 3 times using acetone, and an amphoteric surfactant is obtained.

[0041] Example 1

[0042] A boron nitride polishing liquid, comprising the following preparation raw materials in mass fractions: modified boron nitride 18 parts, suspension synergist 2 parts, stabilizer 3 parts, dispersant 1 part, accelerator 3 parts, nano zirconium oxide with a particle size of 30 nm 0.1 part, and solvent 60 parts, wherein the suspension synergist is prepared by mixing isododecenoic acid and ricinoleic acid at a mass fraction ratio of 3:1, the stabilizer is prepared by mixing amphoteric surfactant and fatty alcohol polyoxyethylene ether AEO3 at a mass fraction ratio of 4:3, the dispersant is prepared by mixing glycerol-3-distearyl ester and dehydrated hexaglycerol dioleate at a mass fraction ratio of 1:2, the accelerator is prepared by mixing polyethylene glycol, polyurethane and polyacrylate at a mass fraction ratio of 1:1:2, and the solvent is prepared by mixing ethylene glycol and deionized water at a mass fraction ratio of 5:2.

[0043] The preparation method of the above-mentioned boron nitride polishing liquid comprises the following steps:

[0044] S101, according to mass fractions, a solvent, a stabilizer, a dispersant and a suspension synergist are sequentially added into a stirred tank, heated to 40 DEG C, and mixed uniformly under stirring to prepare solution A;

[0045] S102, according to the mass fraction, to the solution A, in turn, add the nano zirconium oxide with the particle size of 30 nanometers and the accelerator, under the stirring condition of 100 r / min, stir for 0.5h, then add the modified boron nitride, continue to stir for 1h, prepare the boron nitride polishing liquid.

[0046] Example 2

[0047] A kind of boron nitride polishing liquid, according to mass fraction, includes the following preparation raw materials: modified boron nitride 22 parts, suspension synergist 3 parts, stabilizer 4 parts, dispersing agent 2 parts, accelerator 5 parts, nano zirconium oxide with the particle size of 30 nanometers 0.2 parts, solvent 65 parts, wherein, the suspension synergist is prepared by isomerized dodecanoic acid and ricinoleic acid with mass fraction ratio of 3:1, the stabilizer is prepared by amphoteric surfactant and fatty alcohol polyoxyethylene ether AEO3 with mass fraction ratio of 4:3, the dispersing agent is prepared by glycerol-3-distearyl acid ester and dehydrated hexaglycerol dioleate with mass fraction ratio of 1:2, the accelerator is prepared by polyethylene glycol, polyurethane and polyacrylate with mass fraction ratio of 1:1:2, and the solvent is prepared by ethylene glycol and deionized water with mass fraction ratio of 5:2.

[0048] The preparation method of the above boron nitride polishing liquid includes the following steps:

[0049] S101, according to the mass fraction, to the stirring kettle, in turn, add solvent, stabilizer, dispersing agent and suspension synergist, heat to 50℃, stir and mix uniformly, prepare solution A;

[0050] S102, according to the mass fraction, to the solution A, in turn, add the nano zirconium oxide with the particle size of 30 nanometers and the accelerator, stir for 1h under the stirring condition of 100 r / min, then add the modified boron nitride, continue to stir for 2h, prepare the boron nitride polishing liquid.

[0051] Example 3

[0052] A kind of boron nitride polishing liquid, according to mass fraction, includes the following preparation raw materials: modified boron nitride 20 parts, suspension synergist 2.5 parts, stabilizer 3.5 parts, dispersing agent 1.5 parts, accelerator 4 parts, nano zirconium oxide with the particle size of 30 nanometers 0.15 parts, solvent 63 parts, wherein, the suspension synergist is prepared by isomerized dodecanoic acid and ricinoleic acid with mass fraction ratio of 3:1, the stabilizer is prepared by amphoteric surfactant and fatty alcohol polyoxyethylene ether AEO3 with mass fraction ratio of 4:3, the dispersing agent is prepared by glycerol-3-distearyl acid ester and dehydrated hexaglycerol dioleate with mass fraction ratio of 1:2, the accelerator is prepared by polyethylene glycol, polyurethane and polyacrylate with mass fraction ratio of 1:1:2, and the solvent is prepared by ethylene glycol and deionized water with mass fraction ratio of 5:2.

[0053] The preparation method of the boron nitride polishing solution comprises the following steps:

[0054] S101, according to the mass fraction, the solvent, the stabilizer, the dispersant and the suspension synergist are sequentially added into the stirred tank, heated to 45 DEG C, and stirred and mixed uniformly to prepare solution A;

[0055] S102, according to the mass fraction, the nano zirconium oxide with a particle size of 30 nanometers and the accelerator are sequentially added into the solution A, stirred for 0.8 h under the condition of 100 r / min stirring, and then the modified boron nitride is added and continues to stir for 1.5 h to prepare the boron nitride polishing solution.

[0056] Comparative example 1

[0057] The same as example 3, except that an equal amount of boron nitride with an average particle size of 15 microns is used instead of modified boron nitride.

[0058] Comparative example 2

[0059] The same as example 3, except that the stabilizer is an amphoteric surfactant.

[0060] Comparative example 3

[0061] The same as example 3, except that the stabilizer is a fatty alcohol polyoxyethylene ether AEO3.

[0062] Comparative example 4

[0063] The same as example 3, except that the dispersant is glycerol-3-distearyl ester.

[0064] Comparative example 5

[0065] The same as example 3, except that the dispersant is dehydrated hexaglycerol dioleate.

[0066] Comparative example 6

[0067] The same as example 3, except that the accelerator is polyethylene glycol.

[0068] Comparative example 7

[0069] The same as example 3, except that the accelerator is polyurethane.

[0070] Comparative example 8

[0071] The same as example 3, except that the accelerator is polyacrylate.

[0072] Performance test

[0073] The boron nitride slurry prepared from Example 1, Example 3 and Comparative Examples 1-8 was sampled respectively, and the following evaluation tests were carried out, and the test results are shown in Table 1.

[0074] The resin lenses were used for the grinding test, and the removal rate, Ra, maximum scratch width after grinding, surface contamination after grinding and surface contamination after cleaning were tested, and the details are as follows:

[0075] Surface contamination after grinding: After grinding, the resin lens was washed with deionized water for 1 min, and then observed under a microscope to determine whether there were abrasive debris or particulate matter residues on the surface.

[0076] Surface contamination after cleaning: First, the lens was cleaned with 5% cleaning solution at 40°C for 10 min, and then cleaned with deionized water at 40°C, and then observed under a microscope to determine whether there were abrasive debris or other residues on the surface.

[0077] Maximum scratch width test after grinding: After cleaning, the resin lens was tested for maximum scratch width under a microscope at the same magnification and field of view, and the average value was obtained by measuring three times.

[0078] Suspension after 8h stirring: 200g of deionized water was added to 50g of boron nitride slurry, and stirred at 500r / min for 8h, then poured into a test tube and observed for 1h to determine the suspension of the modified boron nitride.

[0079] The specific grinding experiment equipment and conditions are as follows:

[0080] Grinding equipment: double-sided grinding machine from Chuangqi;

[0081] Resin lens size: 2 inches;

[0082] Test piece number: 1100 pieces; divided into 11 groups (corresponding to Example 1-Example 3 and Comparative Examples 1-8), 100 pieces per group;

[0083] Pressure: 4.0kpa;

[0084] Disc temperature: 20-30°C;

[0085] Grinding time: 10 min.

[0086] Table 1 Performance Test

[0087]

[0088]

[0089] From the data in Table 1, it can be seen that:

[0090] 1) The boron nitride polishing liquid prepared in Examples 1-3 has the advantages of good suspension of the abrasive under long-time shearing action, long cycle life, and high grinding efficiency. The polishing liquid has excellent dispersion effect, can effectively disperse the nanoparticles generated in the polishing process, avoid adsorption to the surface of the abrasive, avoid the generation of agglomerated large particles, and reduce scratches generated in the polishing.

[0091] 2) The performance comparison analysis of the boron nitride polishing liquid prepared in combination with Example 3 and Comparative Example 1 shows that the modification of boron nitride by γ-glycidoxypropyltrimethoxysilane improves the dispersion phase and compatibility of boron nitride in the polishing liquid, thereby obtaining a boron nitride polishing liquid with good dispersion, stability, and extended shelf life.

[0092] 3) The performance comparison analysis of the boron nitride polishing liquid prepared in combination with Example 3 and Comparative Examples 2-3 shows that the stable agent is prepared by mixing amphoteric surfactant and fatty alcohol polyoxyethylene ether AEO3 in a mass fraction ratio of 4:3. The role of the stable agent in the present application is mainly to improve the stability of the polishing liquid, avoid agglomeration and precipitation, and thereby ensure that the abrasive can maintain a good suspended state during the polishing process. At the same time, the stable agent also helps to reduce the viscosity of the polishing liquid, improve its spreading fluidity on the polishing disc, make the resin lens bear force evenly, reduce the surface roughness Ra after polishing, and reduce scratches generated in the polishing. The synergistic effect between the amphoteric surfactant and the fatty alcohol polyoxyethylene ether AEO3 improves the stability, dispersibility, and fluidity of the polishing liquid, reduces the viscosity and surface tension of the polishing liquid, and thereby ensures the efficiency and stability of the boron nitride polishing liquid in the rough grinding process of the resin lens.

[0093] 4) The performance comparison analysis of the boron nitride polishing liquid prepared in combination with Example 3 and Comparative Examples 4-5 shows that the dispersant is prepared by mixing glycerol-3-distearyl acid ester and dehydrated hexaglycerol dioleate in a mass fraction ratio of 1:2. The synergistic effect of glycerol-3-distearyl acid ester and dehydrated hexaglycerol dioleate in the boron nitride polishing liquid improves the stability, dispersibility, and fluidity of the polishing liquid, and thereby ensures the efficiency and stability of the boron nitride polishing liquid in the rough grinding process of the resin lens.

[0094] 5) The performance comparison analysis of the boron nitride polishing liquid prepared in Example 3 and Comparative Examples 6-8 shows that the accelerator prepared by mixing polyethylene glycol, polyurethane and polyacrylate in a mass ratio of 1:1:2 can effectively improve the speed and efficiency of the polishing process. First, the synergistic effect of polyethylene glycol, polyurethane and polyacrylate makes the polishing liquid have stronger reactivity during the polishing process. This accelerator can promote the chemical reaction between the abrasive and the resin lens, improve the polishing speed, and thus shorten the polishing time. Second, the mixed use of the three substances can effectively reduce the energy consumption during the polishing process. By optimizing the polishing conditions, the polishing process is more energy-efficient and cost-effective. Finally, the use of the accelerator can also improve the stability and service life of the polishing liquid. During long-term use, the accelerator can keep the performance of the polishing liquid stable, avoiding the problem of poor polishing effect caused by performance decline.

[0095] The above examples are only used to explain the technical solutions of the present application and not to limit them. Although the above examples have been specifically described, it should be understood by those skilled in the art that the specific embodiments of the present application can still be modified or replaced by equivalents without departing from the spirit and scope of the present application. Any modification and equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the present application.

Claims

1. A boron nitride polishing liquid, characterized by, The preparation raw materials include the following by mass fraction: modified boron nitride 18-22 parts, suspension synergist 2-3 parts, stabilizer 3-4 parts, dispersant 1-2 parts, accelerator 3-5 parts, nanoparticles 0.1-0.2 parts, and solvent 60-65 parts, wherein the suspension synergist is prepared by mixing isododecanoic acid and ricinoleic acid; The preparation method of the modified boron nitride comprises the following steps: uniformly mixing 6-8 parts of γ-glycidyl ether oxypropyl trimethoxysilane, 200 parts of ethanol, and 300 parts of water, then adding 450-500 parts of boron nitride with an average particle size of 10-30 microns, fully stirring for 5-7 hours, heating to 75 DEG C, refluxing for 60 minutes, and then drying after filtration to obtain the modified boron nitride; The stabilizer is prepared by mixing amphoteric surfactant and fatty alcohol polyoxyethylene ether AEO3 in a mass ratio of 4:

3. The preparation method of the amphoteric surfactant comprises the following steps: S51, under nitrogen protection, 21.34g of dodecyl dimethyl tertiary amine is added into a reactor, then 30mL of isopropyl alcohol is added as a solvent, after stirring at 25 DEG C for 4-5 minutes, 6.46g of 1, 3-dichloro-2-propanol is added, the reaction system is heated to 70 DEG C after uniform mixing, and then reacts for 8-10 hours, after the reaction is completed, the solvent is removed by rotary evaporation, and the white solid is obtained by recrystallization three times using ethyl acetate / anhydrous ethanol mixed solvent, wherein the volume ratio of ethyl acetate to anhydrous ethanol is 15:1; S52, under nitrogen protection, 22.24g of white solid is mixed with 30mL of dichloromethane at 25 DEG C and then added into a reactor, 5.60g of chlorosulfonic acid is mixed with 20mL of dichloromethane and then slowly added into the reactor, after reacting for 5 hours, saturated aqueous NaOH solution is slowly added to adjust the pH to 9-10, after neutralization, the solvent is removed by rotary evaporation, the reaction system is refluxed in ethanol for 0.5 hours, inorganic salts are removed by filtration, and the amphoteric surfactant is obtained by recrystallization three times using acetone; The dispersant is prepared by mixing glyceryl-3-distearyl acid ester and dehydrated hexaglycerol dioleate in a mass ratio of 1:2; The accelerator is prepared by mixing polyethylene glycol, polyurethane and polyacrylate in a mass ratio of 1:1:2; The nanoparticles are nano zirconium oxide with a particle size of 20-40 nanometers.

2. The boron nitride polishing liquid according to claim 1, wherein The mass ratio of isododecanoic acid to ricinoleic acid is 3:

1.

3. The boron nitride slurry of claim 1, wherein The solvent is prepared by mixing ethylene glycol and deionized water in a mass ratio of 5:

2.

4. A method of producing the boron nitride slurry according to any one of claims 1 to 3, characterized by The preparation method comprises the following steps: S101, according to the mass fraction, the solvent, the stabilizer, the dispersant and the suspension synergist are sequentially added into a stirred tank, heated to 40-50 DEG C, and then uniformly stirred and mixed to obtain solution A; S102, according to the mass fraction, the nanoparticles and the accelerator are sequentially added into solution A under the condition of stirring at 100r / min for 0.5-1h, and then the modified boron nitride is added, and the stirring is continued for 1-2h to obtain the boron nitride polishing liquid.

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