High-efficiency glass processing polishing powder and preparation method thereof

Abstract

The application discloses a kind of high-efficiency glass processing polishing powder and preparation method thereof.The polishing powder is composed of modified nano cerium oxide, composite rare earth grinding aid, beta-silicon nitride abrasive, surface control agent, temperature control slow-release dispersant and zirconia-silica core-shell particles.By the synergistic modification of phosphite and epoxy silane, the application constructs high-activity Ce 3+ / Ce 4+ Surface structure, and introduces the zirconia-silica core-shell particles that can absorb local mechanical impact, combines porous beta-silicon nitride particles with composite grinding aid, forms a "chemical-mechanical-energy absorption" synergistic polishing mechanism.The prepared polishing powder has excellent dispersibility, stability and low damage characteristics, realizes higher material removal rate and fewer scratches while maintaining low surface roughness, is significantly superior to existing polishing materials, and is suitable for efficient polishing processing of optical glass, cover glass and precision components.

Description

Technical Field

[0001] This invention relates to the field of glass processing technology, and in particular to a high-efficiency glass processing polishing powder and its preparation method. Background Technology

[0002] With the increasing prevalence of high-alumina-silicon glass, ultra-thin touch glass, 3D curved cover glass, and automotive optical glass, the glass processing industry has placed higher demands on polishing powders, namely, achieving high removal rates, low surface roughness, minimal scratches, and long-term dispersion stability. Currently, mainstream polishing powders still use cerium oxide as the core material. However, traditional cerium oxide particles have limited surface chemical activity, and single silane or organic acid modifications are prone to failure under high shear and temperature conditions. Rare earth grinding aids have limited chemical reaction-promoting capabilities due to insufficient lattice defects. Conventional dense particles cannot absorb stress during polishing, easily causing localized scratches. Simultaneously, nanoparticles exhibit significant agglomeration and sedimentation in water, reducing polishing stability. Powders obtained through conventional mechanical sieving have a wide particle size distribution, resulting in poor surface uniformity. Furthermore, existing dispersants are mostly single-function structures, making it difficult to effectively regulate changes in glass surface charge, and the chemical-mechanical synergy at the polishing interface is insufficient. These factors all limit the efficiency and quality of high-end glass processing. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a high-efficiency glass polishing powder and its preparation method. This invention solves the problems of low polishing efficiency, poor dispersion stability, and frequent mechanical scratches in existing glass polishing powders.

[0004] This invention can be achieved through the following technical solutions: A high-efficiency glass processing polishing powder comprises the following components in parts by weight: 40-75 parts of modified nano-cerium oxide, 10-25 parts of composite rare earth grinding aid, 3-15 parts of β-silicon nitride abrasive particles, 1-8 parts of surface conditioner, 0.5-5 parts of temperature-controlled slow-release dispersant, and 2-10 parts of zirconium oxide-silica core-shell particles.

[0005] A method for preparing a high-efficiency glass processing and polishing powder includes the following steps: Step 1: Add deionized water, nano-cerium oxide with a particle size of 30-80nm, and metaphosphate to a beaker to carry out a displacement reaction. Then add epoxy silane to carry out a hydrolysis-condensation reaction. Filter, dry the filter cake, and calcine at 300-450℃ to obtain modified cerium oxide. Step 2: Add lanthanum oxide, praseodymium oxide, and neodymium oxide to a V-type mixer and mix at 20-40 rpm for 20-40 minutes. Then add the mixture to a ball mill jar, add deionized water, and ball mill at 250-350 rpm for 2-4 hours. After that, dry the slurry, pulverize it, pass it through a 200-300 mesh sieve, place it in an aluminum crucible in a muffle furnace, calcine it at 900-1050℃ for 2-4 hours, cool it to room temperature, remove it, pulverize it, pass it through a 300-400 mesh sieve, and dry it to obtain the composite rare earth grinding aid. Step 3: Add modified cerium oxide, composite rare earth grinding aid, and β-silicon nitride abrasive particles to deionized water, disperse ultrasonically, then add surface conditioner and temperature-controlled slow-release dispersant, and spray dry to obtain composite polishing powder base particles; Step 4: Add the polishing powder base particles to the zirconium oxide-silica core-shell particles, stir at 2500-3000 rpm for 3-5 minutes, and use an air classifier to shape the particle size to obtain high-efficiency glass processing polishing powder.

[0006] Preferably, in step 1, the mass ratio of nano-cerium oxide, metaphosphate, and epoxysilane is 100:(2-8):(4-12).

[0007] Preferably, in step 1, the pH of the displacement reaction is 4-6, the temperature is 30-50℃, and the time is 20-40 min.

[0008] Preferably, the hydrolysis-condensation reaction in step 1 is carried out at a temperature of 40-70°C for 1-3 hours.

[0009] Preferably, the mass ratio of lanthanum oxide, praseodymium oxide, and neodymium oxide in step 2 is (1-2):(0.5-1):(0.5-1).

[0010] Preferably, in step 3, the particle size of the β-silicon nitride abrasive grains is 20-60 nm, and the aperture ratio is 30-55%.

[0011] Preferably, the surface regulator in step 3 is prepared as follows: Under a nitrogen atmosphere, acrylic acid, vinylphosphonic acid, mercaptoethanol, and deionized water are added to a reaction vessel in a mass ratio of (10-25) g: (3-12) g: (0.05-0.5) g. The mixture is stirred at 65-75°C, and then (2-5) g of ammonium persulfate is added to carry out a copolymerization reaction for 2-4 hours. The temperature is then lowered to 40-50°C, and (5-15) g of epichlorohydrin and ammonia are added. The pH is adjusted to 6.0-7.0, and the mixture is distilled under reduced pressure to obtain the surface regulator.

[0012] Preferably, the temperature-controlled slow-release dispersant in step 3 is a polyethylene oxide-polycaprolactone-polyethylene oxide triblock copolymer.

[0013] Preferably, the operating parameters of the air classifier in step 4 are: rotation speed 8000-12000 rpm, airflow velocity 35-55 m / s, and temperature 20-35℃.

[0014] The beneficial effects of this invention are: This invention significantly improves the efficiency and surface quality of glass polishing through enhanced chemical activity, mechanical energy absorption buffering, and structurally stable dispersion. The nano-cerium oxide used in this invention undergoes dual surface modification with metaphosphate ester and epoxy silane, resulting in a Ce-rich surface. 3+ / Ce 4+ The reversible transformation activity is significantly enhanced, accelerating the silicon-oxygen bond breaking process on the glass surface and greatly increasing the chemical wear rate. Combined with the oxygen vacancy structure formed by rare earth doping, the material removal rate is significantly improved by 20%-35%. The zirconia-silica inorganic core-shell energy-absorbing particles and porous β-silicon nitride abrasive particles introduced in this invention work together to homogenize contact pressure and absorb instantaneous impact loads during polishing, thereby effectively suppressing the generation of microcracks, micropits, and scratches on the glass surface, resulting in a significant reduction in surface roughness after polishing. The introduction of a dual-coordination interface regulator gives the polishing powder excellent dispersion stability in the liquid phase, preventing particle agglomeration and ensuring consistency and controllability during long-term polishing. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 The average roughness of the glass and the removal rate are given. Detailed Implementation

[0016] The following provides a detailed description of the embodiments of the present invention: These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and processes. However, the scope of protection of the present invention is not limited to the following embodiments. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions. Example

[0017] A high-efficiency glass processing polishing powder comprises the following components in parts by weight: 40 parts modified nano-cerium oxide, 10 parts composite rare earth grinding aid, 3 parts β-silicon nitride abrasive particles, 1 part surface conditioner, 0.5 parts temperature-controlled slow-release dispersant, and 2 parts zirconium oxide-silicon dioxide core-shell particles.

[0018] This embodiment describes a method for preparing a high-efficiency glass processing and polishing powder, comprising the following steps: Step 1: Add 150mL of deionized water, 50g of cerium oxide nanoparticles with a particle size of 30nm and 2g of metaphosphate to a beaker. Carry out a displacement reaction at pH 4 and 30℃ for 40min. Then add 4g of epoxy silane and carry out a hydrolysis-condensation reaction at 40℃ for 3h. Filter, dry the filter cake and calcine at 300℃ to obtain modified cerium oxide. Step 2: Add 10g of lanthanum oxide, 5g of praseodymium oxide, and 5g of neodymium oxide to a V-type mixer and mix at 20 rpm for 40 minutes. Then add the mixture to a ball mill jar, add deionized water, and ball mill at 250 rpm for 4 hours. After that, dry the slurry, pulverize it, pass it through a 200-mesh sieve, place it in an aluminum crucible in a muffle furnace, calcine it at 900℃ for 4 hours, cool it to room temperature, remove it, pulverize it, pass it through a 300-mesh sieve, and dry it to obtain a composite rare earth grinding aid. Step 3: Under a nitrogen atmosphere, add 10g acrylic acid, 3g vinylphosphonic acid, 0.05g mercaptoethanol and 200mL deionized water to the reactor, stir at 65°C, then add 2g ammonium persulfate for copolymerization reaction for 4h, cool to 40°C, add 5g epichlorohydrin and ammonia water, adjust the pH to 6.0, and distill under reduced pressure to obtain the surface regulator. Step 4: Add modified cerium oxide, composite rare earth grinding aid, and β-silicon nitride abrasive particles with a particle size of 20 nm and an opening rate of 30% to deionized water, disperse by ultrasonication, then add surface regulator and polyethylene oxide-polycaprolactone-polyethylene oxide triblock copolymer, and spray dry to obtain composite polishing powder base particles. Step 5: Add the polishing powder base particles to the zirconium oxide-silica core-shell particles, stir at 2500 rpm for 5 min, and use an air classifier at 8000 rpm, airflow speed of 35 m / s, and 20℃ to perform particle size shaping to obtain high-efficiency glass processing polishing powder. Example

[0019] A high-efficiency glass processing polishing powder comprises the following components in parts by weight: 57.5 parts modified nano-cerium oxide, 17.5 parts composite rare earth grinding aid, 9 parts β-silicon nitride abrasive particles, 4.5 parts surface conditioner, 2.75 parts temperature-controlled slow-release dispersant, and 6 parts zirconium oxide-silica core-shell particles.

[0020] This embodiment describes a method for preparing a high-efficiency glass processing and polishing powder, comprising the following steps: Step 1: Add 200mL of deionized water, 50g of cerium oxide nanoparticles with a particle size of 55nm and 5g of metaphosphate to a beaker. Carry out a displacement reaction at pH 5 and 40℃ for 30min. Then add 8g of epoxy silane and carry out a hydrolysis-condensation reaction at 55℃ for 2h. Filter, dry the filter cake and calcine at 375℃ to obtain modified cerium oxide. Step 2: Add 15g of lanthanum oxide, 7.5g of praseodymium oxide, and 7.5g of neodymium oxide to a V-type mixer and mix at 30 rpm for 30 minutes. Then add the mixture to a ball mill jar, add deionized water, and ball mill at 300 rpm for 3 hours. After that, dry the slurry, pulverize it, pass it through a 250-mesh sieve, place it in an aluminum crucible in a muffle furnace, calcine it at 975℃ for 3 hours, cool it to room temperature, remove it, pulverize it, pass it through a 350-mesh sieve, and dry it to obtain a composite rare earth grinding aid. Step 3: Under a nitrogen atmosphere, add 17.5g acrylic acid, 7.5g vinylphosphonic acid, 0.275g mercaptoethanol and 300mL deionized water to the reactor, stir at 70°C, then add 3.5g ammonium persulfate to carry out copolymerization reaction for 3h, cool down to 45°C, add 10g epichlorohydrin and ammonia water, adjust the pH to 6.5, and distill under reduced pressure to obtain the surface regulator; Step 4: Add modified cerium oxide, composite rare earth grinding aid, and β-silicon nitride abrasive particles with a particle size of 40 nm and an opening rate of 42.5% to deionized water, disperse by ultrasonication, then add surface regulator and polyethylene oxide-polycaprolactone-polyethylene oxide triblock copolymer, and spray dry to obtain composite polishing powder base particles. Step 5: Add the polishing powder base particles to the zirconium oxide-silica core-shell particles, stir at 2750 rpm for 4 min, and use an air classifier at 10000 rpm, airflow speed of 45 m / s, and 27.5℃ to perform particle size shaping to obtain high-efficiency glass processing polishing powder. Example

[0021] A high-efficiency glass processing polishing powder comprises the following components in parts by weight: 75 parts modified nano-cerium oxide, 25 parts composite rare earth grinding aid, 15 parts β-silicon nitride abrasive particles, 8 parts surface conditioner, 5 parts temperature-controlled slow-release dispersant, and 10 parts zirconium oxide-silicon dioxide core-shell particles.

[0022] This embodiment describes a method for preparing a high-efficiency glass processing and polishing powder, comprising the following steps: Step 1: Add 250mL of deionized water, 50g of cerium oxide nanoparticles with a particle size of 80nm and 8g of metaphosphate to a beaker. Carry out a displacement reaction at pH 6 and 50℃ for 20min. Then add 12g of epoxy silane and carry out a hydrolysis-condensation reaction at 70℃ for 1h. Filter, dry the filter cake and calcine at 450℃ to obtain modified cerium oxide. Step 2: Add 20g of lanthanum oxide, 10g of praseodymium oxide, and 10g of neodymium oxide to a V-type mixer and mix at 40 rpm for 20 minutes. Then add the mixture to a ball mill jar, add deionized water, and ball mill at 350 rpm for 2 hours. After that, dry the slurry, pulverize it, pass it through a 300-mesh sieve, place it in an aluminum crucible in a muffle furnace, calcine it at 1050℃ for 2 hours, cool it to room temperature, remove it, pulverize it, pass it through a 400-mesh sieve, and dry it to obtain a composite rare earth grinding aid. Step 3: Under a nitrogen atmosphere, add 25g acrylic acid, 12g vinylphosphonic acid, 0.5g mercaptoethanol and 400mL deionized water to the reactor, stir at 75°C, then add 5g ammonium persulfate for copolymerization reaction for 2h, cool to 50°C, add 15g epichlorohydrin and ammonia water, adjust the pH to 7.0, and distill under reduced pressure to obtain the surface regulator. Step 4: Add modified cerium oxide, composite rare earth grinding aid, and β-silicon nitride abrasive particles with a particle size of 60nm and an opening rate of 55% to deionized water, disperse by ultrasonication, then add surface regulator and polyethylene oxide-polycaprolactone-polyethylene oxide triblock copolymer, and spray dry to obtain composite polishing powder base particles. Step 5: Add the polishing powder base particles to the zirconium oxide-silica core-shell particles, stir at 3000 rpm for 3 min, and use an air classifier at 12000 rpm, airflow speed of 55 m / s, and 35℃ to perform particle size shaping to obtain high-efficiency glass processing polishing powder. Example

[0023] A high-efficiency glass processing polishing powder comprises the following components in parts by weight: 40 parts modified nano-cerium oxide, 25 parts composite rare earth grinding aid, 15 parts β-silicon nitride abrasive particles, 1 part surface conditioner, 0.5 parts temperature-controlled slow-release dispersant, and 10 parts zirconium oxide-silicon dioxide core-shell particles.

[0024] This embodiment describes a method for preparing a high-efficiency glass processing and polishing powder, comprising the following steps: Step 1: Add 250mL of deionized water, 50g of cerium oxide nanoparticles with a particle size of 30nm and 8g of metaphosphate to a beaker. Carry out a displacement reaction at pH 6 and 30℃ for 20min. Then add 12g of epoxysilane and carry out a hydrolysis-condensation reaction at 70℃ for 1h. Filter, dry the filter cake and calcine at 450℃ to obtain modified cerium oxide. Step 2: Add 10g of lanthanum oxide, 10g of praseodymium oxide, and 5g of neodymium oxide to a V-type mixer and mix at 40 rpm for 40 minutes. Then add the mixture to a ball mill jar, add deionized water, and ball mill at 250 rpm for 2 hours. After that, dry the slurry, pulverize it, pass it through a 200-mesh sieve, place it in an aluminum crucible in a muffle furnace, calcine it at 1050℃ for 4 hours, cool it to room temperature, remove it, pulverize it, pass it through a 400-mesh sieve, and dry it to obtain a composite rare earth grinding aid. Step 3: Under a nitrogen atmosphere, add 25g acrylic acid, 3g vinylphosphonic acid, 0.5g mercaptoethanol and 400mL deionized water to the reactor, stir at 75°C, then add 2g ammonium persulfate for copolymerization reaction for 2h, cool to 50°C, add 5g epichlorohydrin and ammonia water, adjust the pH to 7.0, and distill under reduced pressure to obtain the surface regulator. Step 4: Add modified cerium oxide, composite rare earth grinding aid, and β-silicon nitride abrasive particles with a particle size of 20nm and an opening rate of 55% to deionized water, disperse by ultrasonication, then add surface regulator and polyethylene oxide-polycaprolactone-polyethylene oxide triblock copolymer, and spray dry to obtain composite polishing powder base particles. Step 5: Add the polishing powder base particles to the zirconium oxide-silica core-shell particles, stir at 2500 rpm for 3 min, and use an air classifier at 8000 rpm, airflow speed of 35 m / s, and 35℃ to perform particle size shaping to obtain high-efficiency glass processing polishing powder.

[0025] Comparative Example 1: The difference between this comparative example and Example 1 is that no composite rare earth grinding aid is added.

[0026] A high-efficiency glass processing polishing powder comprises the following components in parts by weight: 40 parts modified nano-cerium oxide, 3 parts β-silicon nitride abrasive particles, 1 part surface conditioner, 0.5 parts temperature-controlled slow-release dispersant, and 2 parts zirconium oxide-silica core-shell particles.

[0027] The preparation method of a high-efficiency glass processing polishing powder in this comparative example includes the following steps: Step 1: Add 150mL of deionized water, 50g of cerium oxide nanoparticles with a particle size of 30nm and 2g of metaphosphate to a beaker. Carry out a displacement reaction at pH 4 and 30℃ for 40min. Then add 4g of epoxy silane and carry out a hydrolysis-condensation reaction at 40℃ for 3h. Filter, dry the filter cake and calcine at 300℃ to obtain modified cerium oxide. Step 2: Under a nitrogen atmosphere, add 10g acrylic acid, 3g vinylphosphonic acid, 0.05g mercaptoethanol and 200mL deionized water to the reactor, stir at 65℃, then add 2g ammonium persulfate for copolymerization reaction for 4h, cool to 40℃, add 5g epichlorohydrin and ammonia water, adjust the pH to 6.0, and distill under reduced pressure to obtain the surface regulator. Step 3: Add modified cerium oxide and β-silicon nitride abrasive particles with a particle size of 20 nm and an opening rate of 30% to deionized water, disperse by ultrasonication, then add surface modifier and polyethylene oxide-polycaprolactone-polyethylene oxide triblock copolymer, and spray dry to obtain composite polishing powder base particles. Step 4: Add the polishing powder base particles to the zirconium oxide-silica core-shell particles, stir at 2500 rpm for 5 min, and use an air classifier at 8000 rpm, airflow speed of 35 m / s, and 20℃ to perform particle size shaping to obtain high-efficiency glass processing polishing powder.

[0028] Comparative Example 2: The difference between this comparative example and Example 1 is that no zirconium oxide-silica core-shell particles are added.

[0029] A high-efficiency glass processing polishing powder comprises the following components in parts by weight: 40 parts modified nano-cerium oxide, 10 parts composite rare earth grinding aid, 3 parts β-silicon nitride abrasive particles, 1 part surface conditioner, 0.5 parts temperature-controlled slow-release dispersant, and zirconium oxide-silicon dioxide core-shell.

[0030] The preparation method of a high-efficiency glass processing polishing powder in this comparative example includes the following steps: Step 1: Add 150mL of deionized water, 50g of cerium oxide nanoparticles with a particle size of 30nm and 2g of metaphosphate to a beaker. Carry out a displacement reaction at pH 4 and 30℃ for 40min. Then add 4g of epoxy silane and carry out a hydrolysis-condensation reaction at 40℃ for 3h. Filter, dry the filter cake and calcine at 300℃ to obtain modified cerium oxide. Step 2: Add 10g of lanthanum oxide, 5g of praseodymium oxide, and 5g of neodymium oxide to a V-type mixer and mix at 20 rpm for 40 minutes. Then add the mixture to a ball mill jar, add deionized water, and ball mill at 250 rpm for 4 hours. After that, dry the slurry, pulverize it, pass it through a 200-mesh sieve, place it in an aluminum crucible in a muffle furnace, calcine it at 900℃ for 4 hours, cool it to room temperature, remove it, pulverize it, pass it through a 300-mesh sieve, and dry it to obtain a composite rare earth grinding aid. Step 3: Under a nitrogen atmosphere, add 10g acrylic acid, 3g vinylphosphonic acid, 0.05g mercaptoethanol and 200mL deionized water to the reactor, stir at 65°C, then add 2g ammonium persulfate for copolymerization reaction for 4h, cool to 40°C, add 5g epichlorohydrin and ammonia water, adjust the pH to 6.0, and distill under reduced pressure to obtain the surface regulator. Step 4: Add modified cerium oxide, composite rare earth grinding aid, and β-silicon nitride abrasive particles with a particle size of 20 nm and an opening rate of 30% to deionized water, disperse by ultrasonication, then add surface regulator and polyethylene oxide-polycaprolactone-polyethylene oxide triblock copolymer, and spray dry to obtain composite polishing powder base particles. Step 5: Add the polishing powder base particles to the zirconium oxide-silica core-shell particles, stir at 2500 rpm for 5 min, and use an air classifier at 8000 rpm, airflow speed of 35 m / s, and 20℃ to perform particle size shaping to obtain high-efficiency glass processing polishing powder.

[0031] 1. Removal rate test Step 1: Select a standard soda-lime glass with dimensions of 50mm×50mm×5mm, and clean it with deionized water and anhydrous ethanol for 10 minutes in sequence, then let it air dry naturally. Step 2: Weigh the polishing powder sample and prepare a polishing solution with a mass fraction of 5wt%. Use deionized water as solvent, stir magnetically for 10 minutes at room temperature, and then disperse ultrasonically for 10 minutes to obtain a uniformly suspended polishing solution. Let it stand for 5 minutes before use to observe whether there is obvious sedimentation. Shake gently before use. Step 3: Test on a surface polishing machine. The polishing conditions for all samples are: polyurethane polishing pad, polishing disc speed 75 rpm, carrier speed 30 rpm, load pressure 15 kPa, polishing fluid flow rate 30 mL / min, and polishing time 30 min. Step 4: Before polishing, weigh each glass sample and record the mass as m0. After polishing, rinse the sample surface with deionized water to remove residual polishing powder, then rinse with ethanol, blow dry, and weigh again, recording the mass as m1. Calculate the material removal rate per unit time: Removal rate = (m0 - m1) / ρ * A * t Where ρ is the density of glass (g / cm³) 3 A represents the polished area (cm²) 2 ), t is the polishing time (min), and the result is converted to μm / min.

[0032] Table 1 Removal Rate Test Data sample Initial mass (g) Mass after polishing (g) Removal rate (μm / min) Example 1 25.46 25.32 0.85 Example 2 25.51 25.34 1.04 Example 3 25.48 25.29 1.16 Example 4 25.50 25.33 1.03 Comparative Example 1 25.47 25.39 0.49 Comparative Example 2 25.49 25.36 0.79 Table 1 shows that Examples 1-4 all exhibited excellent overall polishing performance under the same polishing conditions. The dual-modified cerium oxide active core and composite rare earth grinding aid used in this invention significantly improved the chemical bond breaking rate of the glass surface, increasing the material removal rate by an average of 18-35%, demonstrating the high reactivity of the system in the chemomechanical synergistic reaction. In Comparative Example 1, without dual-modified cerium oxide, the polishing slurry exhibited poor dispersion stability and a significantly decreased removal rate.

[0033] 2 Surface roughness test Step 1: Clean the polished glass sample with deionized water and ethanol, blow it dry, and place it in a dust-free environment for 15 minutes. Step 2: Set the profilometer test parameters: sampling length 4.0 mm, scanning speed 0.3 mm / s, cutoff wavelength 0.8 mm; Step 3: Select 5 different locations for each sample, scan along the same direction, record the Ra value, and take the average of 5 measurements for each piece of glass as the Ra value of that sample.

[0034] Table 2 Surface Roughness Test Data sample Average roughness (nm) Example 1 1.83 Example 2 1.45 Example 3 1.39 Example 4 1.52 Comparative Example 1 2.67 Comparative Example 2 2.15 Table 2 shows that in Examples 1-4, the porous β-silicon nitride abrasive grains and the zirconium oxide-silicon dioxide core-shell energy-absorbing structure can homogenize the polishing contact pressure and absorb local mechanical impacts, resulting in a lower Ra value after glass polishing, approximately 30-55% lower than the comparative examples. In Comparative Example 2, lacking the composite rare earth grinding aid, the chemical reactivity was insufficient, and the surface finish was significantly weaker than in Example 1. The comparative examples, without core-shell energy-absorbing particles, relied solely on the abrasive grains, easily leading to localized stress concentration and an increased Ra value.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-efficiency glass processing and polishing powder, characterized in that, It includes the following components by weight: 40-75 parts of modified nano-cerium oxide, 10-25 parts of composite rare earth grinding aid, 3-15 parts of β-silicon nitride abrasive particles, 1-8 parts of surface conditioner, 0.5-5 parts of temperature-controlled slow-release dispersant, and 2-10 parts of zirconium oxide-silica core-shell particles.

2. The high-efficiency glass processing and polishing powder according to claim 1, characterized in that, The preparation method of the high-efficiency glass processing and polishing powder includes the following steps: Step 1: Add deionized water, nano-cerium oxide with a particle size of 30-80nm, and metaphosphate to a beaker to carry out a displacement reaction. Then add epoxy silane to carry out a hydrolysis-condensation reaction. Filter, dry the filter cake, and calcine at 300-450℃ to obtain modified cerium oxide. Step 2: Add lanthanum oxide, praseodymium oxide, and neodymium oxide to a V-type mixer and mix at 20-40 rpm for 20-40 minutes. Then add the mixture to a ball mill jar, add deionized water, and ball mill at 250-350 rpm for 2-4 hours. After that, dry the slurry, pulverize it, pass it through a 200-300 mesh sieve, place it in an aluminum crucible in a muffle furnace, calcine it at 900-1050℃ for 2-4 hours, cool it to room temperature, remove it, pulverize it, pass it through a 300-400 mesh sieve, and dry it to obtain the composite rare earth grinding aid. Step 3: Add modified cerium oxide, composite rare earth grinding aid, and β-silicon nitride abrasive particles to deionized water, disperse by ultrasonication, then add surface conditioner and temperature-controlled slow-release dispersant, and spray dry to obtain composite polishing powder base particles; Step 4: Add the polishing powder base particles to the zirconium oxide-silica core-shell particles, stir at 2500-3000 rpm for 3-5 minutes, and use an air classifier to shape the particle size to obtain high-efficiency glass processing polishing powder.

3. The method for preparing high-efficiency glass processing and polishing powder according to claim 2, characterized in that, In step 1, the mass ratio of nano-cerium oxide, metaphosphate, and epoxysilane is 100:(2-8):(4-12).

4. The method for preparing high-efficiency glass processing and polishing powder according to claim 2, characterized in that, In step 1, the pH of the displacement reaction is 4-6, the temperature is 30-50℃, and the time is 20-40 min.

5. The method for preparing high-efficiency glass processing and polishing powder according to claim 2, characterized in that, The hydrolysis-condensation reaction in step 1 is carried out at a temperature of 40-70℃ for 1-3 hours.

6. The method for preparing high-efficiency glass processing and polishing powder according to claim 2, characterized in that, In step 2, the mass ratio of lanthanum oxide, praseodymium oxide, and neodymium oxide is (1-2):(0.5-1):(0.5-1).

7. The method for preparing high-efficiency glass processing and polishing powder according to claim 2, characterized in that, In step 3, the particle size of the β-silicon nitride abrasive grains is 20-60 nm, and the aperture ratio is 30-55%.

8. The method for preparing high-efficiency glass processing and polishing powder according to claim 2, characterized in that, The surface regulator in step 3 is prepared as follows: Under a nitrogen atmosphere, acrylic acid, vinylphosphonic acid, mercaptoethanol and deionized water are added to the reactor in a mass ratio of (10-25) g: (3-12) g: (0.05-0.5) g. The mixture is stirred at 65-75°C, and then (2-5) g of ammonium persulfate is added to carry out a copolymerization reaction for 2-4 hours. The temperature is then lowered to 40-50°C, and (5-15) g of epichlorohydrin and ammonia are added. The pH is adjusted to 6.0-7.0, and the mixture is distilled under reduced pressure to obtain the surface regulator.

9. The method for preparing high-efficiency glass processing and polishing powder according to claim 2, characterized in that, In step 3, the temperature-controlled slow-release dispersant is a polyethylene oxide-polycaprolactone-polyethylene oxide triblock copolymer.

10. The method for preparing high-efficiency glass processing and polishing powder according to claim 2, characterized in that, The operating parameters of the air classifier in step 4 are: rotation speed 8000-12000 rpm, airflow velocity 35-55 m / s, and temperature 20-35℃.

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