High-refractive wear-resistant glass microbeads and preparation method thereof

Abstract

The application relates to the technical field of glass bead manufacturing, in particular to high-refraction wear-resistant glass beads and a preparation method thereof. The preparation method of the high-refraction wear-resistant glass beads comprises the following steps: S1, raw material pretreatment and dry mixing; S2, raw material mixing: the powder and a modifier are put into a mixing machine, dry mixing is carried out for 15-20 minutes to obtain dry mixed material, the dry mixed material is smelted at 1480-1520 DEG C for 2-4 hours under stirring, the temperature is increased to 1520-1550 DEG C after smelting, and the smelted material is clarified and homogenized for 2-3 hours under standing and heat preservation until no obvious bubbles are generated, a smelted liquid is obtained, gear jet spinning forming is adopted to form beads, and the beads are shaped in a shaping area to obtain microbeads; and S3, post-treatment. The application provides high-refraction wear-resistant glass beads and a preparation method thereof, so as to solve the problems of insufficient refractive index and poor wear resistance of glass beads in the prior art.

Description

Technical Field

[0001] This application relates to the field of glass microsphere manufacturing technology, and in particular to a high-refractive-index wear-resistant glass microsphere and its preparation method. Background Technology

[0002] Glass microspheres possess advantages such as light weight, low thermal conductivity, high strength, and good chemical stability. As the core reflective material for road markings, their performance directly determines their reflectivity and durability. To enhance the reflectivity of road markings under adverse conditions such as rain and nighttime, microspheres must have the highest possible refractive index (greater than 1.9); and because they must withstand repeated rolling by vehicle wheels and abrasion from road surface gravel, they also need to possess excellent wear resistance.

[0003] Currently, the large-scale production of high-refractive-index glass microspheres mainly employs the high-temperature melting method. This method involves melting the prepared glass batch into a homogeneous molten glass in a furnace, then dispersing the melt into fine droplets using methods such as gear centrifugal casting, followed by cooling and solidification to form microspheres. This process boasts advantages such as high efficiency and low cost, making it the mainstream manufacturing route for glass microspheres used in road markings in China. However, to increase the refractive index of the glass, a large amount of high-polarizability components are typically introduced into the formulation, which weakens the mechanical strength and wear resistance of the glass itself. Simultaneously, additional reinforcing components are added to improve wear resistance, leading to a significant increase in melt viscosity and melting temperature. This makes subsequent bead formation difficult and increases energy consumption, making it difficult to simultaneously achieve high refractive index, high wear resistance, and high sphericity, thus hindering the development of high-refractive-index wear-resistant glass microspheres. Summary of the Invention

[0004] This application provides a high-refractive-index wear-resistant glass microsphere and its preparation method to solve the problems of insufficient refractive index and poor wear resistance of glass microspheres in related technologies.

[0005] In a first aspect, a method for preparing high-refractive-index wear-resistant glass microspheres is provided, comprising the following steps: S1. Raw material pretreatment and dry mixing: According to the mass fractions, grind 28-32 parts of quartz sand, 30-35 parts of titanium dioxide, 20-24 parts of barium carbonate, 5-7 parts of zinc oxide, 2-4 parts of zirconium oxide, 6-9 parts of boric acid, and 1-2 parts of alumina to below 200 mesh, put them into a mixer and add 0.5-1 parts of soda ash, dry mix for 15-25 minutes to obtain powder; S2. Raw material mixing: The powder and modifier are put into a mixer and dry-mixed for 15-20 minutes to obtain a dry mixture. Under stirring conditions, the dry mixture is melted at 1480-1520℃ for 2-4 hours. After melting, the temperature is raised to 1520-1550℃ and kept at the temperature for 2-3 hours to clarify and homogenize until there are no obvious bubbles. The melt is then formed into beads using a gear spray molding method and shaped in a shaping area to obtain microbeads. The amount of the modifier added is 5-8% of the powder mass; S3, Post-processing: S301. Anneal the microspheres, cool them to room temperature, immerse them in a 1-2 wt% sodium hydroxide aqueous solution, stir at room temperature for 10-15 min, wash and dry. S302. The washed and dried microspheres are placed into the post-treatment solution and immersed for 15-20 minutes under stirring. After being taken out and drained, they are treated at 100-110℃ for 0.5-1 hours to obtain high-refractive-index wear-resistant glass microspheres. The method for preparing the post-treatment solution includes: dispersing 3-aminopropyltriethoxysilane in an ethanol solution, adjusting the pH to 3.8-4.2, stirring at room temperature for 20-30 minutes, and then adding povidone under stirring conditions to obtain the post-treatment solution; The mass ratio of 3-aminopropyltriethoxysilane to ethanol solution is 1:(98~100), the amount of povidone added is 1~2% of the mass of ethanol solution, and the ethanol solution comprises anhydrous ethanol and deionized water in a mass ratio of 10:(0.8~1).

[0006] Preferably, in step S2, the method for preparing the modifier includes: The modifier is obtained by mixing hydrotalcite, metal phosphate and alkali metal oxide precursor in a mass ratio of 6:(2~3):1 and grinding them, and then passing them through a 250-mesh sieve.

[0007] Preferably, the metal phosphate is selected from anhydrous disodium hydrogen phosphate; The alkali metal oxide precursor is selected from lithium carbonate or potassium carbonate.

[0008] Preferably, the modifier further includes sodium molybdate, and the amount of sodium molybdate added is 3 to 5% of the mass of hydrotalcite.

[0009] Preferably, in step S2, the gear spray forming method uses a high-speed rotating toothed disc with a rotational speed of 900~1250 r / min and a melt flow rate of 8~16 kg / h; the forming zone temperature is 900~1000℃.

[0010] Preferably, step S2 further includes a pretreatment step for the high-speed rotating toothed disk: After preheating the high-speed rotating toothed disk to 200~260°C, a suspension is sprayed on it to form a lubricating coating. The suspension comprises boron nitride and anhydrous ethanol in a mass ratio of 5:(95~100).

[0011] Preferably, in step S301, the annealing temperature is 560~600℃.

[0012] Preferably, in S302, the mass-to-volume ratio of microbeads to treatment liquid is 1g:2mL.

[0013] In a second aspect, a high-refractive-index wear-resistant glass microsphere is provided, characterized in that it is prepared by any of the above-described methods for preparing high-refractive-index wear-resistant glass microspheres.

[0014] The beneficial effects of the technical solution provided in this application include: This application provides a method for preparing high-refractive-index wear-resistant glass microspheres. Titanium dioxide and barium carbonate, as high-refractive-index components, endow the glass microspheres with high-refractive-index properties. MgO and Al2O3 generated from the thermal decomposition of hydrotalcite in the modifier can be embedded in the glass network voids to enhance compactness. Simultaneously, the microbubbles generated from the decomposition also have a clarifying effect. Metal phosphates and alkali metal oxide precursors help lower the melting temperature, while the introduction of P... 5+ The material is stretched; after annealing, it is impregnated with alkaline solution and post-treatment solution. The silanol generated by the hydrolysis of silane coupling agent condenses with Si-OH on the glass surface to form a chemically bonded polysiloxane network. Polyvinyl ketone, as a toughening component, synergistically reduces stress concentration during wear and provides a protective layer with a low coefficient of friction, effectively improving the retroreflection coefficient retention rate. Therefore, it can solve the problems of insufficient refractive index and poor wear resistance of glass microspheres in related technologies. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A flowchart illustrating the preparation method of high-refractive-index wear-resistant glass microspheres provided in this application; Figure 2 A flowchart of the post-processing steps in the preparation method of high-refractive-index wear-resistant glass microspheres provided in this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] See Figures 1-2As shown, this application provides a high-refractive-index wear-resistant glass microsphere and its preparation method.

[0019] In the following examples and comparative examples, the quartz sand used was refined quartz sand with SiO2 ≥ 99.5%; the titanium dioxide was anatase type with TiO2 ≥ 98%, average particle size ≤ 5 μm, and whiteness ≥ 94; barium carbonate, zinc oxide, boric acid, and lithium carbonate were all industrial grade; zirconium oxide was monoclinic phase with ZrO2 ≥ 99%, d 50 <10μm; Alumina is α-Al2O3, d50<5μm; Soda ash is light soda ash, Na2CO3≥99.2%; Hydrotalcite is magnesium aluminum hydrotalcite; Sodium molybdate is sodium molybdate dihydrate (Na2MoO4·2H2O); Boron nitride is hexagonal boron nitride h-BN, particle size 1~3μm; Povidone PVP K30, average molecular weight about 40000, K value 28.

[0020] Example 1 The method for preparing high-refractive-index wear-resistant glass microspheres provided in this embodiment includes the following steps: S1. Raw material pretreatment and dry mixing: Grind 300g of quartz sand, 320g of titanium dioxide, 200g of barium carbonate, 60g of zinc oxide, 20g of zirconium oxide, 80g of boric acid and 10g of aluminum oxide to below 200 mesh, put them into a mixer and add 5g of soda ash, dry mix for 20 minutes to obtain powder. S2. Raw material mixing: The powder obtained in S1 and 65g of modifier are put into a mixer and dry-mixed for 15 minutes to obtain a dry mixture. Under stirring conditions, the dry mixture is melted at 1500℃ for 3 hours. After melting, the temperature is raised to 1530℃ and kept at the temperature for 2.5 hours to clarify and homogenize until there are no obvious bubbles. The melt is then formed into beads using a gear spray molding method and shaped in the shaping area to obtain microbeads. The gear spray forming method uses a high-speed rotating toothed disc with a rotation speed of 1000 r / min and a melt flow rate of 10 kg / h; the forming zone temperature is 1000℃. Furthermore, the high-speed rotating toothed disk undergoes suspension pretreatment: after preheating the high-speed rotating toothed disk to 230℃, a suspension is sprayed on to form a lubricating coating. The suspension is prepared by dispersing 5g of boron nitride powder in 95g of anhydrous ethanol and ultrasonically dispersing for 15min to obtain the suspension; it needs to be shaken well before spraying.

[0021] S3, Post-processing: S301. Anneal the microspheres at 600℃, cool them to room temperature, immerse them in a 2wt% sodium hydroxide aqueous solution, stir at room temperature for 10 minutes, wash and dry. S302. 200g of washed and dried microspheres were put into 400mL of post-treatment solution and immersed for 15min under stirring. After being taken out and drained, they were treated at 100℃ for 1h to obtain high refractive wear-resistant glass microspheres. In S2, the modifier is prepared by mixing 48g of hydrotalcite, 16g of anhydrous disodium hydrogen phosphate, 8g of lithium carbonate, and 1.5g of sodium molybdate, grinding them, and then passing them through a 250-mesh sieve to obtain the modifier.

[0022] In S302, the post-treatment solution is prepared as follows: 4g of 3-aminopropyltriethoxysilane (KH-550) is dispersed in 400g of ethanol solution (anhydrous ethanol and deionized water in a mass ratio of 10:1), the pH is adjusted to 4.0, and after stirring at room temperature for 20min, 4g of povidone is added under stirring conditions to obtain the post-treatment solution.

[0023] Example 2 The difference from Example 1 is that in this example, step S2 does not involve spraying the suspension onto the high-speed rotating toothed disk, and sodium molybdate is not added to the modified liquid.

[0024] Example 3 The method for preparing high-refractive-index wear-resistant glass microspheres provided in this embodiment includes the following steps: S1. Raw material pretreatment and dry mixing: Grind 280g of quartz sand, 300g of titanium dioxide, 200g of barium carbonate, 50g of zinc oxide, 20g of zirconium oxide, 60g of boric acid and 10g of aluminum oxide to below 200 mesh, put them into a mixer and add 5g of soda ash, dry mix for 15 minutes to obtain powder. S2. Raw material mixing: The powder obtained in S1 and 46.25g of modifier are put into a mixer and dry-mixed for 15 minutes to obtain a dry mixture. Under stirring conditions, the dry mixture is melted at 1480℃ for 3 hours. After melting, the temperature is raised to 1520℃ and kept at the temperature for 2 hours to clarify and homogenize until there are no obvious bubbles. The melt is obtained by using a gear spray molding method to form beads and shaping them in the shaping area to obtain microbeads. The gear spray forming method uses a high-speed rotating toothed disc with a rotation speed of 900 r / min and a melt flow rate of 8 kg / h; the forming zone temperature is 900℃. Furthermore, the high-speed rotating toothed disk undergoes suspension pretreatment: after preheating the high-speed rotating toothed disk to 200℃, a suspension is sprayed on to form a lubricating coating. The suspension is prepared by dispersing 5g of boron nitride powder in 100g of anhydrous ethanol and ultrasonically dispersing for 15min to obtain the suspension; it needs to be shaken well before spraying.

[0025] S3, Post-processing: S301. Anneal the microspheres at 560℃, cool them to room temperature, immerse them in a 1wt% sodium hydroxide aqueous solution, stir at room temperature for 10 minutes, wash and dry. S302. 200g of washed and dried microspheres were put into 400mL of post-treatment solution and immersed for 15min under stirring. After being taken out and drained, they were treated at 100℃ for 0.5h to obtain high refractive wear-resistant glass microspheres. In S2, the modifier is prepared by mixing 30g of hydrotalcite, 15g of anhydrous disodium hydrogen phosphate, 5g of potassium carbonate, and 0.9g of sodium molybdate, grinding them, and then passing them through a 250-mesh sieve to obtain the modifier.

[0026] In S302, the post-treatment solution is prepared as follows: 4.1g of 3-aminopropyltriethoxysilane (KH-550) is dispersed in 401.8g of ethanol solution (anhydrous ethanol and deionized water in a mass ratio of 10:0.8), the pH is adjusted to 3.8, and after stirring at room temperature for 20min, 6g of povidone is added under stirring conditions to obtain the post-treatment solution.

[0027] Example 4 The method for preparing high-refractive-index wear-resistant glass microspheres provided in this embodiment includes the following steps: S1. Raw material pretreatment and dry mixing: Grind 320g of quartz sand, 350g of titanium dioxide, 240g of barium carbonate, 70g of zinc oxide, 40g of zirconium oxide, 90g of boric acid and 20g of aluminum oxide to below 200 mesh, put them into a mixer and add 10g of soda ash, dry mix for 25 minutes to obtain powder. S2. Raw material mixing: The powder obtained in S1 and 91.2g of modifier are put into a mixer and dry-mixed for 20 minutes to obtain a dry mixture. The dry mixture is melted at 1520℃ for 4 hours under stirring conditions. After melting, the temperature is raised to 1550℃ and kept at the temperature for 3 hours to clarify and homogenize until there are no obvious bubbles. The melt is then formed into beads using a gear spraying molding method and shaped in the shaping area to obtain microbeads. The gear spray forming method uses a high-speed rotating toothed disc with a rotation speed of 1250 r / min and a melt flow rate of 16 kg / h; the forming zone temperature is 1000℃. Furthermore, the high-speed rotating toothed disk undergoes suspension pretreatment: after preheating the high-speed rotating toothed disk to 260℃, a suspension is sprayed on to form a lubricating coating. The suspension is prepared by dispersing 5g of boron nitride powder in 95g of anhydrous ethanol and ultrasonically dispersing for 15min to obtain the suspension; it needs to be shaken well before spraying.

[0028] S3, Post-processing: S301. Anneal the microspheres at 600℃, cool them to room temperature, immerse them in a 2wt% sodium hydroxide aqueous solution, stir at room temperature for 15 minutes, wash and dry. S302. 200g of washed and dried microspheres were put into 400mL of post-treatment solution and immersed for 20min under stirring. After being taken out and drained, they were treated at 110℃ for 0.5h to obtain high refractive wear-resistant glass microspheres. In S2, the modifier is prepared by mixing 60g of hydrotalcite, 30g of anhydrous disodium hydrogen phosphate, 10g of lithium carbonate, and 3g of sodium molybdate, grinding them, and then passing them through a 250-mesh sieve to obtain the modifier.

[0029] In S302, the post-treatment solution is prepared as follows: 4g of 3-aminopropyltriethoxysilane (KH-550) is dispersed in 400g of ethanol solution (anhydrous ethanol and deionized water in a mass ratio of 10:1), the pH is adjusted to 4.2, and after stirring at room temperature for 30min, 8g of povidone is added under stirring conditions to obtain the post-treatment solution.

[0030] Comparative Example 1 The difference between this comparative example and Example 1 is that no modifier is added in step S2, and step S302 is not performed.

[0031] Comparative Example 2 The difference between this comparative example and Example 1 is that no modifier is added in step S2.

[0032] Comparative Example 3 The difference between this comparative example and Example 1 is that step S302 is not performed.

[0033] The high-refractive-index wear-resistant glass microspheres (hereinafter referred to as "glass microspheres") prepared in the above embodiments and comparative examples were tested.

[0034] Refer to GB / T 24722 The 2020 standard for "Glass Beads for Road Markings" specifies that glass microbeads with a diameter of 106-800 μm are used as finished products, and the refractive index of the finished glass microbeads is tested using the immersion method.

[0035] Further referring to this standard, a glass bead sorter was used to separate round glass microspheres and defective glass microspheres. The total mass N of all the separated round glass microspheres and the total mass C of the defective glass microspheres were weighed, accurate to 0.1g, and the roundness P of the glass microspheres was calculated.

[0036] Where: P - roundness rate (%); Total mass (g) of N-spherical glass microspheres; C - Total mass (g) of defective glass microspheres.

[0037] Furthermore, the retroreflectance retention rate of the glass microspheres prepared in the examples was tested. The road marking paint used in this test was a hot-melt type.

[0038] Glass microspheres were mixed with hot-melt road marking paint (the glass microsphere content was 20% of the paint mass). The mixture was molded into marking templates measuring 300mm × 100mm × 2mm. These templates were then cured at room temperature (23±2)℃ and relative humidity (50±5)% for 72 hours. The cured templates were then placed horizontally on a test bench. Retroreflection coefficients were measured at five different locations (four corners and the center) using a retroreflection coefficient measuring instrument (measurement angle: observation angle 0.2°, incident angle -4°). The values ​​were recorded, and the arithmetic mean of the five points was calculated as the initial retroreflection coefficient R0 (mcd). m -2 lx -1 ).

[0039] After measuring the R0 of the marking template, fix it on the worktable of the abrasion testing machine, ensuring full contact between the grinding wheel and the template surface. Set the wear cycle to 500 cycles and conduct the abrasion test. After completion, continue to measure the retroreflection coefficient at 5 measuring points using the above method, and use this as the retroreflection coefficient R1 after wear. Calculate the retroreflection coefficient retention rate η: Referring to the thermal shock test in GB / T 11419-2008 "Test Method for Thermal Shock Resistance of Enamel", the thermal shock breakage rate was calculated as follows: 10g of glass microspheres were taken, kept in an electric furnace at 600℃ for 10 min, and then quickly poured into ice water at 10℃. The microspheres were then removed, dried, and sieved. The mass passing through the lower limit sieve (106μm) was calculated. This part represents the fragments generated by the breakage of the glass microspheres. The breakage rate was calculated as follows: Breakage rate (%) = (Mass of fragments passing through the lower limit sieve / Total mass of the sample) × 100%.

[0040] Table 1 In Example 2, compared to Example 1, no suspension spraying was performed on the high-speed rotating toothed disk. The molten liquid tended to adhere and trail when detaching from the disk, resulting in a lower roundness and a higher breakage rate. In Example 3, compared to Example 1, the proportions of the raw materials were slightly adjusted, and lithium carbonate was replaced with potassium carbonate in the modifier. + The ionic electronic polarizability is lower than that of Li + Furthermore, the proportions of titanium dioxide and barium carbonate in the raw materials were slightly reduced, the refractive index was slightly reduced, the melting temperature was also slightly reduced, the homogenization effect was slightly weaker, and the wear resistance decreased slightly as a result. In Example 4, the proportion of modifier was increased, and the amount of titanium dioxide and barium carbonate was also increased. The refractive index and retroreflection coefficient retention rates were the highest in Example 1.

[0041] Compared to Example 1, Comparative Example 1 did not use a modifier and did not undergo any post-treatment. Its refractive index decreased, its sphericity was poor, and some glass microspheres cracked after wear, resulting in a decrease in retroreflection coefficient retention rate. Comparative Example 2 was impregnated with a post-treatment solution but did not use a modifier. Its refractive index decreased. Although the post-treatment solution could improve the initial retroreflection coefficient R0, its wear resistance was poor, and its retroreflection coefficient retention rate η decreased. The overall value was higher than that of Comparative Example 1 but lower than that of Example 1. Comparative Example 3 was not impregnated with a post-treatment solution. As can be seen from Table 1, it had little effect on the refractive index and sphericity, but its breakage rate was higher than that of the examples.

[0042] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for preparing high-refractive-index wear-resistant glass microspheres, characterized in that, It includes the following steps: S1. Raw material pretreatment and dry mixing: According to the mass fractions, grind 28-32 parts of quartz sand, 30-35 parts of titanium dioxide, 20-24 parts of barium carbonate, 5-7 parts of zinc oxide, 2-4 parts of zirconium oxide, 6-9 parts of boric acid, and 1-2 parts of alumina to below 200 mesh, put them into a mixer and add 0.5-1 parts of soda ash, dry mix for 15-25 minutes to obtain powder; S2. Raw material mixing: The powder and modifier are put into a mixer and dry-mixed for 15-20 minutes to obtain a dry mixture. Under stirring conditions, the dry mixture is melted at 1480-1520℃ for 2-4 hours. After melting, the temperature is raised to 1520-1550℃ and kept at the temperature for 2-3 hours to clarify and homogenize until there are no obvious bubbles. The melt is then formed into beads using a gear spray molding method and shaped in a shaping area to obtain microbeads. The amount of the modifier added is 5-8% of the powder mass; The method for preparing the modifier includes: The modifier is obtained by mixing hydrotalcite, metal phosphate and alkali metal oxide precursor in a mass ratio of 6:(2~3):1 and grinding them. S3, Post-processing: S301. Anneal the microspheres, cool them to room temperature, immerse them in a 1-2 wt% sodium hydroxide aqueous solution, stir at room temperature for 10-15 minutes, wash and dry them. S302. The washed and dried microspheres are placed into the post-treatment solution and immersed for 15-20 minutes under stirring. After being taken out and drained, they are treated at 100-110℃ for 0.5-1 hours to obtain high-refractive-index wear-resistant glass microspheres. The method for preparing the post-treatment solution includes: dispersing 3-aminopropyltriethoxysilane in an ethanol solution, adjusting the pH to 3.8-4.2, stirring at room temperature for 20-30 minutes, and then adding povidone under stirring conditions to obtain the post-treatment solution; The mass ratio of 3-aminopropyltriethoxysilane to ethanol solution is 1:(98~100), the amount of povidone added is 1~2% of the mass of ethanol solution, and the ethanol solution comprises anhydrous ethanol and deionized water in a mass ratio of 10:(0.8~1).

2. The method for preparing high-refractive-index wear-resistant glass microspheres as described in claim 1, characterized in that: The metal phosphate is selected from anhydrous disodium hydrogen phosphate; The alkali metal oxide precursor is selected from lithium carbonate or potassium carbonate.

3. The method for preparing high-refractive-index wear-resistant glass microspheres as described in claim 1, characterized in that: The modifier also includes sodium molybdate, and the amount of sodium molybdate added is 3 to 5% of the mass of hydrotalcite.

4. The method for preparing high-refractive-index wear-resistant glass microspheres as described in claim 1, characterized in that: In S2, the gear spray forming method uses a high-speed rotating toothed disc with a rotation speed of 900~1250 r / min and a melt flow rate of 8~16 kg / h; the forming zone temperature is 900~1000℃.

5. The method for preparing high-refractive-index wear-resistant glass microspheres as described in claim 4, characterized in that: S2 also includes a pretreatment step for the high-speed rotating toothed disk: After preheating the high-speed rotating toothed disk to 200~260°C, a suspension is sprayed on it to form a lubricating coating. The suspension comprises boron nitride and anhydrous ethanol in a mass ratio of 5:(95~100).

6. The method for preparing high-refractive-index wear-resistant glass microspheres as described in claim 1, characterized in that: In S301, the annealing temperature is 560~600℃.

7. The method for preparing high-refractive-index wear-resistant glass microspheres as described in claim 1, characterized in that: In S302, the mass-to-volume ratio of microbeads to treatment liquid is 1g:2mL.

8. A type of high-refractive-index wear-resistant glass microsphere, characterized in that, It is prepared by the method for preparing high-refractive-index wear-resistant glass microspheres as described in any one of claims 1 to 7.

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