A polishing composition for high-speed polishing

Abstract

The present application belongs to abrasive tool technical field, and relates to a kind of high-speed grinding abrasive composition.The high-speed grinding abrasive composition is mainly made of 40-50 parts by weight of abrasive, 2-3 parts by weight of pore-forming agent granules, 48-57 parts by weight of ceramic binder by irregular granulation, sintering.The present application uses melt-blown non-woven fabric, cross-linked phenolic resin to make pore-forming agent granules, which gives the abrasive composition a multi-pore structure, improves the gap structure between abrasive fines, and makes the new cutting edge easy to emerge after the abrasive fines are blunt, giving the abrasive better self-sharpening property.Meanwhile, by preparing traditional spherical abrasive into irregular shape with multiple jagged edge structure, the abrasive is tightly combined with the resin binder, and the resin has strong holding force on the abrasive during grinding, so the abrasive is not easy to fall off and cause scratches.The abrasive pad made of the abrasive composition can adapt to high-speed grinding and achieve high removal rate when grinding hard and brittle materials.

Description

Technical Field

[0001] This invention belongs to the field of abrasive and grinding tool technology, and relates to an abrasive composition for high-speed grinding. Background Technology

[0002] Currently, in the consumer electronics field, high-speed, continuous processing is commonly used for thinning mobile phone glass. The grinding disc maintains a high rotation speed, which greatly improves grinding efficiency. This high-efficiency processing method places extremely high demands on the stability of the equipment and grinding consumables. Due to the high rotation speed of the grinding disc, the abrasive particles experience significant friction, making it easy for the abrasive to detach from the grinding media, causing scratches on the workpiece. Furthermore, high-speed grinding necessitates that the abrasive possess high cutting force, strong toughness, and wear resistance, which places even higher demands on the abrasives used in high-speed grinding.

[0003] Abrasives such as diamond, CBN, corundum, silicon carbide, and boron carbide are widely used in industrial production due to their high hardness and wear resistance. However, these abrasives are single crystals, which, although possessing extremely high hardness, exhibit anisotropy, few cutting edges, poor toughness, and are highly prone to scratching workpieces. Commonly used polycrystalline abrasives, such as polycrystalline diamond, while possessing high particle toughness, numerous cutting edges, and good self-sharpening properties, are limited in large-scale application due to low production volume and high price. Summary of the Invention

[0004] The purpose of this invention is to provide a high-speed grinding composition to solve the problems of low removal rate and easy scratching of workpieces in existing grinding compositions.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A high-speed grinding composition is provided, wherein the high-speed grinding composition is mainly composed of 40-50 parts by weight of abrasive, 2-3 parts by weight of pore-forming granules and 48-57 parts by weight of ceramic binder, which are irregularly granulated and sintered; the sphericity of the granules obtained by irregular granulation is not greater than 0.8, and the pore-forming granules are mainly obtained by granulation of meltblown nonwoven fabric scraps and cross-linked phenolic resin.

[0007] The high-speed grinding composition provided by this invention uses meltblown nonwoven fabric and cross-linked phenolic resin to create a pore-forming granule, giving the grinding composition a multi-porous structure. This improves the void structure between abrasive microparticles, making it easier for new cutting edges to emerge after the abrasive microparticles become dull, thus giving the abrasive better self-sharpening properties. Simultaneously, by preparing traditional spherical abrasives into an irregular shape with multiple serrated edges, they are tightly bonded to the resin binder. During grinding, the resin has a strong holding force on the abrasive, making it less likely for the abrasive to fall off and cause scratches. Grinding pads made with this grinding composition can adapt to high-speed grinding and achieve high removal rates when grinding hard and brittle materials.

[0008] This invention can use waste masks as a source of meltblown nonwoven fabric material. The waste masks can be used in this invention after simple sterilization treatment, realizing waste utilization and reducing production costs.

[0009] Furthermore, the meltblown nonwoven fabric is a polypropylene meltblown nonwoven fabric.

[0010] As a further improvement, the particle size of the pore-forming agent granules is 10–20 μm.

[0011] As a further improvement, the irregular granulation includes spray drying using a blade-type atomizing dispersion disc, and adjusting the roundness of the granules obtained from irregular granulation by adjusting the curvature of the blades of the blade-type atomizing dispersion disc. The beneficial effects of the above technical solution are: using a blade-type atomizing dispersion disc for spray drying is conducive to obtaining irregularly shaped granules, reducing the likelihood of scratching the workpiece, and improving processing quality.

[0012] As a further improvement, the blade radius of the blade-type atomizing dispersion disc is 10-40 mm. By reducing the blade radius of the blade-type atomizing dispersion disc, particles with smaller sphericity are obtained. The beneficial effects of the above technical solution are: adopting the above design helps to improve the irregularity of the grinding composition shape, giving the grinding composition a multi-serrated edge shape, further improving the resin's holding force on the grinding composition during the grinding process, and further improving the grinding effect. Moreover, the smaller the blade radius of the blade-type atomizing dispersion disc, the smaller the sphericity of the particles obtained from irregular granulation, the more irregular the shape of the particles obtained from irregular granulation, and the better the grinding effect.

[0013] As a further improvement, the roundness of the granules obtained from irregular granulation is 0.40 to 0.62. The beneficial effect of the above technical solution is that the roundness of the granules obtained from irregular granulation is within the above range, which can make the grinding composition have sharper edges and corners, further improving the grinding effect of the grinding composition.

[0014] As a further improvement, the inlet temperature of the spray dryer is 260–300°C, and the outlet temperature is 120–150°C. The beneficial effect of the above technical solution is that the above design facilitates the preparation of traditional spherical abrasives into irregular shapes with multiple serrated edges.

[0015] As a further improvement, the abrasive is one or any combination of diamond, CBN, corundum, silicon carbide, and boron carbide. The beneficial effects of the above technical solution are: these materials have high hardness, and by granulating and binding the abrasive powder together, the hardness advantage of single-crystal materials can be utilized to achieve the grinding effect of polycrystalline materials.

[0016] Furthermore, the abrasive of the present invention can be a single crystal, a polycrystalline material, or a mixture of single crystal and polycrystalline material.

[0017] Furthermore, the particle size of the abrasive is 15–30 μm.

[0018] As a further improvement, the mass ratio of the meltblown nonwoven fabric scraps to the crosslinked phenolic resin is (0.2-0.6):(20-40). The beneficial technical effects of the above solution are: the crosslinked phenolic resin can act as a crosslinking agent and a pore-forming agent; the meltblown nonwoven fabric with the above-mentioned content, in combination with the crosslinked phenolic resin, facilitates the formation of the pore-forming agent granules and gives it better pore-forming performance.

[0019] Further, the preparation of the pore-forming agent granules includes: pulverizing meltblown nonwoven fabric to obtain nonwoven fabric fragments; mixing cross-linked phenolic resin with ethanol to prepare a cross-linked phenolic resin solution; mixing the cross-linked phenolic resin solution with the nonwoven fabric fragments, curing at 120-180°C, and then crushing, shaping, and sieving the cured pore-forming agent granules.

[0020] As a further improvement, the sintering temperature is 750–800°C. The beneficial effects of the above technical solution are: the pore-forming agent granules can form a uniform pore structure at the above temperature, which can improve the self-sharpening property of the grinding composition and further improve the removal rate of the grinding composition.

[0021] As a further improvement, the granules are mixed with sodium chloride before sintering, and the mass ratio of the granules to sodium chloride is 2:1 to 3:1. The beneficial effect of the above technical solution is that it can effectively prevent the adhesion between granules during the sintering process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a centrifugal atomizing dryer that uses a columnar atomizing dispersion disc in the prior art.

[0023] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0024] Figure 3 yes Figure 1 Three-dimensional structural diagram of the central columnar atomizing dispersion disk;

[0025] Figure 4 yes Figure 1 Perspective view of the central columnar atomizing dispersion disk;

[0026] Figure 5 This is a schematic diagram of the blade-type atomizing dispersion disc in Example 4;

[0027] Figure 6This is a schematic diagram of the blade-type atomizing dispersion disc in Example 5;

[0028] Figure 7 This is a schematic diagram of the blade-type atomizing dispersion disc in Example 6;

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-Feed pipe, 2-Distribution plate, 3-Annular cavity, 4-Atomizing dispersion plate, 5-Motor, 6-Column, 7-Blade, 8-Upper opening, 9-Outer edge. Detailed Implementation

[0031] The high-speed grinding composition provided by the present invention is mainly made of 40-50 parts by weight of abrasive, 2-3 parts by weight of pore-forming granules and 48-57 parts by weight of ceramic binder through irregular granulation and sintering; the sphericity of the granules obtained by irregular granulation is not greater than 0.8, and the pore-forming granules are mainly obtained by granulation of meltblown nonwoven fabric scraps and cross-linked phenolic resin.

[0032] This invention utilizes a centrifugal atomizing dryer to achieve the aforementioned irregular granulation. Conventional circular granulation typically uses a columnar atomizing dispersion disc, and the structure of a centrifugal atomizing dryer using a columnar atomizing dispersion disc is as follows... Figure 1 and Figure 2 As shown, the structure of the columnar atomizing dispersion disk is as follows: Figure 3 and Figure 4 As shown, the centrifugal atomization process is as follows: the slurry to be atomized enters the annular cavity 3 of the separating plate 2 through the feed pipe 1, and then flows into the atomizing dispersion plate 4. The atomizing dispersion plate 4 rotates at high speed under the drive of the output shaft of the motor 5. The column 6 on the atomizing dispersion plate 4 disperses the slurry into small droplets that fly outward and are then dried into granules by hot air.

[0033] Extensive experiments have revealed that the sphericity of the granules obtained by the centrifugal atomizing dryer using the aforementioned columnar atomizing dispersion disc is greater than 0.8. This means that the sphericity of the granules is higher simply by using the column 6 of the columnar atomizing dispersion disc to disperse the slurry film.

[0034] This invention uses a centrifugal atomizing dryer with a blade-type atomizing dispersion disc for spray drying. Unlike a columnar atomizing dispersion disc, it uses blades for atomization and dispersion. For example... Figure 5 , Figure 6 and Figure 7 As shown, the blade 7 is arc-shaped, and multiple arc-shaped blades 7 are spaced apart along the circumference of the dispersion disk. One end of the arc-shaped blade 7 extends to the upper opening 8 of the dispersion disk, and the other end of the arc-shaped blade 7 extends to the outer edge 9 of the dispersion disk.

[0035] This invention obtains highly irregular granules by adjusting the radius of the blades, that is, by adjusting the curvature of the blades (in conjunction with centrifugal atomization parameters). The granules have a serrated edge structure and are tightly bonded to the resin binder. During the grinding process, the resin has a strong holding force on the abrasive, and the abrasive is not easy to fall off and cause scratches.

[0036] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. Unless otherwise specified, all experimental reagents used in the following embodiments are commercially available conventional products. Among them, the cross-linked phenolic resin powder is product model 1902, manufactured by Shijiazhuang Yiao. The ceramic binder is a commercially available product with a suitable sintering temperature range of 750–800℃.

[0037] I. An Example of an Abrasive Composition for High-Speed ​​Grinding

[0038] 1. Description of the implementation and experiment of pore-forming agent granulation material

[0039] Example 1

[0040] The high-speed grinding composition of this embodiment is prepared by the following steps:

[0041] First, the pore-forming agent granules are prepared. The pore-forming agent granules, by weight percentage, are prepared from the following raw materials: polypropylene meltblown nonwoven fabric: 0.2%, cross-linked phenolic resin powder: 20%, and anhydrous ethanol: 79.8%.

[0042] First, the polypropylene meltblown nonwoven fabric is pulverized to a size no larger than 300μm per piece. Then, cross-linked phenolic resin powder is mixed with anhydrous ethanol. After the phenolic resin powder is completely dissolved, the pulverized meltblown nonwoven fabric is added to the mixture while stirring. The mixture is then cured at 170℃. After curing, the fabric is crushed, shaped, and sieved, and 10-20μm segments are taken for later use.

[0043] Next, three materials were weighed according to their weight percentages: 40% 30μm diamond single crystal micro powder, 3% 10-20μm pore-forming agent granulator, and 57% ceramic binder. These three materials were mixed for 3 hours using a three-dimensional mixer. The mixed material was then added in small amounts to a 0.3% HEC (hydroxyethyl cellulose) aqueous solution (the proportion of the mixed material in the total mass of the mixed material and the 0.3% HEC aqueous solution was 20%–60%, more preferably 30%–50%, and 40% was used in this embodiment). After ultrasonication and stirring for 30 minutes, the mixture was granulated. Granulation was performed using a centrifugal atomizing dryer with a blade-type atomizing dispersion disc, where the blade radius R = 30mm. The inlet temperature of the centrifugal atomizing dryer was controlled at 270℃ and the outlet temperature at 125℃ to obtain granules.

[0044] Finally, the granular material and analytical grade sodium chloride were mixed evenly at a mass ratio of 3:1, and calcined in a muffle furnace at 750℃ for 8 hours. The calcined material was then washed with pure water multiple times to remove the sodium chloride adhering to the surface of the material. The conductivity was measured to be less than 100 μS / cm. The material was then dried and passed through 60# and 210# sieves to obtain the grinding composition for high-speed grinding.

[0045] Example 2

[0046] The high-speed grinding composition of this embodiment is prepared by the following steps:

[0047] First, the pore-forming agent granules are prepared. The pore-forming agent granules, by weight percentage, are prepared from the following raw materials: polypropylene meltblown nonwoven fabric: 0.4%, cross-linked phenolic resin powder: 30%, and anhydrous ethanol: 69.6%.

[0048] First, the polypropylene meltblown nonwoven fabric is pulverized to a size no larger than 300μm per piece. Then, cross-linked phenolic resin powder is mixed with anhydrous ethanol. After the phenolic resin powder is completely dissolved, the pulverized meltblown nonwoven fabric is added to the mixture while stirring. The mixture is then cured at 170℃. After curing, the fabric is crushed, shaped, and sieved, and 10-20μm segments are taken for later use.

[0049] Next, weigh out the following three materials by weight percentage: 30μm diamond single crystal powder: 40%, 10-20μm pore-forming agent granulation material: 3%, and ceramic binder: 57%. Other steps are the same as in Example 1.

[0050] Example 3

[0051] The high-speed grinding composition of this embodiment is prepared by the following steps:

[0052] First, the pore-forming agent granules are prepared. The pore-forming agent granules, by weight percentage, are prepared from the following raw materials: polypropylene meltblown nonwoven fabric: 0.6%, cross-linked phenolic resin powder: 40%, and anhydrous ethanol: 59.4%.

[0053] First, the polypropylene meltblown nonwoven fabric is pulverized to a size no larger than 300μm per piece. Then, cross-linked phenolic resin powder is mixed with anhydrous ethanol. After the phenolic resin powder is completely dissolved, the pulverized meltblown nonwoven fabric is added to the mixture while stirring. The mixture is then cured at 170℃. After curing, the fabric is crushed, shaped, and sieved, and 10-20μm segments are taken for later use.

[0054] Next, weigh out the following three materials by weight percentage: 30μm diamond single crystal powder: 40%, 10-20μm pore-forming agent granulation material: 3%, and ceramic binder: 57%. Other steps are the same as in Example 1.

[0055] Comparative Example 1

[0056] The high-speed grinding composition of this comparative example was prepared by the following steps:

[0057] First, the pore-forming agent granules are prepared. The pore-forming agent granules, by weight percentage, are prepared from the following raw materials: cross-linked phenolic resin powder: 30%, anhydrous ethanol: 70%.

[0058] Dissolve 30% crosslinked phenolic resin in 70% anhydrous ethanol and cure it at 170℃. After curing, crush, sort, and sieve the resin, and take 10-20μm segments for later use.

[0059] Next, weigh out the following three materials by weight percentage: 30μm diamond single crystal powder: 40%, 10-20μm pore-forming agent granulation material: 3%, and ceramic binder: 57%. Other steps are the same as in Example 1.

[0060] Comparative Example 2

[0061] The high-speed grinding composition of this comparative example is a granulated material without a pore-forming agent in Comparative Example 2.

[0062] The high-speed grinding composition of Comparative Example 2 was prepared by the following steps: two materials were weighed by weight percentage: 30μm diamond single crystal micro powder: 40%, ceramic binder: 60%. Other steps were the same as in Example 1.

[0063] The abrasive compositions of Examples 1-3 and Comparative Examples 1-2 were used to prepare abrasive pads using conventional techniques in the art. The prepared abrasive pads were then used to grind K9 glass on a Kizi single-sided grinder at a pressure of 300 g / cm². 2 Record the grinding removal rate, roughness, and grinding state of K9 glass.

[0064] Method for detecting roundness: Using a Baxter particle image analyzer, images of the object to be tested are captured via video, and then the particle shape is analyzed using software to obtain roundness parameters.

[0065] Impact strength testing method: Use a synthetic diamond strength tester, weigh the test material according to the standard amount, impact it according to the standard frequency and number of impacts, and the ratio of the D50 of the material after impact to the D50 of the material before impact is the impact strength.

[0066] The test results of the grinding compositions of Examples 1-3 and Comparative Examples 1-2 are shown in Table 1.

[0067] Table 1. Test results of the grinding compositions of Examples 1-3 and Comparative Examples 1-2

[0068]

[0069] Wherein, the grinding composition Mv refers to the average particle size of the grinding composition.

[0070] As can be seen from Table 1, as the content of polypropylene meltblown nonwoven fabric increases from 0.2% to 0.6%, the impact strength of the abrasive composition decreases sequentially, the removal rate of the abrasive pad increases accordingly, and the roughness increases accordingly. Comparing the increase in removal rate and roughness, Example 2 performs better overall, and 0.4% polypropylene meltblown nonwoven fabric is the optimal addition amount.

[0071] Comparative Example 1, without adding polypropylene meltblown nonwoven fabric during the preparation of the pore-forming agent granulation material, used only cross-linked phenolic resin as the pore-forming agent, resulting in short scratches on K9 glass after grinding. Comparative Example 2, without adding any pore-forming agent, directly performed spray granulation; the grinding pad made from the grinding composition showed low removal rate, heavy grinding marks, and long scratches on K9 glass.

[0072] The main reason for the differences in the above experiments may be that polypropylene meltblown nonwoven fabric can adjust the hardness and brittleness of the resin composite block. As the content of polypropylene meltblown nonwoven fabric increases, the toughness of the phenolic resin composite block increases. Under the same crushing, shaping, and sieving conditions, the resulting pore-forming agent granules are larger and more rounded. The subsequent grinding composition obtained by spray granulation has relatively larger pores and a relatively higher porosity. If the content of polypropylene meltblown nonwoven fabric is too high, using this grinding composition to make a grinding pad to grind K9 glass may cause glass scratches during the grinding process due to poor bonding strength and easy breakage of the grinding composition.

[0073] 2. Description of the implementation and experiment of irregular granular materials

[0074] Example 4

[0075] The high-speed grinding composition of this embodiment is prepared by the following steps:

[0076] First, the pore-forming agent granules are prepared. The pore-forming agent granules, by weight percentage, are prepared from the following raw materials: polypropylene meltblown nonwoven fabric: 0.4%, cross-linked phenolic resin powder: 30%, and anhydrous ethanol: 69.6%.

[0077] First, the polypropylene meltblown nonwoven fabric is pulverized to a size no larger than 300μm per piece. Then, cross-linked phenolic resin powder is mixed with anhydrous ethanol. After the phenolic resin powder is completely dissolved, the pulverized meltblown nonwoven fabric is added to the mixture while stirring. The mixture is then cured at 170℃. After curing, the fabric is crushed, shaped, and sieved, and 10-20μm segments are taken for later use.

[0078] Next, three materials were weighed according to their weight percentages: 50% for 15μm silicon carbide micropowder, 2% for 10-20μm pore-forming granulator, and 48% for ceramic binder. These three materials were mixed for 3 hours using a three-dimensional mixer. The mixed material was then added in small amounts to a 0.3% HEC (hydroxyethyl cellulose) aqueous solution (the proportion of the mixed material in the total mass of the mixed material and the 0.3% HEC aqueous solution was 20%–60%, more preferably 30%–50%, and 40% was used in this embodiment). After ultrasonication and stirring for 30 minutes, granulation was performed. Granulation was carried out using a centrifugal atomizing dryer with a blade-type atomizing dispersion disc. The structure of the blade-type atomizing dispersion disc is as follows... Figure 5 As shown, the radius R of the arc-shaped blade is 40 mm. The inlet temperature of the centrifugal atomizing dryer is controlled at 270℃ and the outlet temperature at 125℃ to obtain granular material.

[0079] Finally, the granular material and analytical grade sodium chloride were mixed evenly at a mass ratio of 2:1, and calcined in a muffle furnace at 800℃ for 6 hours. The calcined material was then washed with pure water multiple times to remove the sodium chloride adhering to the surface of the material. The conductivity was measured to be less than 100 μS / cm. The material was then dried and passed through 150# and 210# sieves to obtain the grinding composition for high-speed grinding.

[0080] Example 5

[0081] The high-speed grinding composition of this embodiment is prepared by the following steps:

[0082] First, the pore-forming agent granules are prepared. The pore-forming agent granules, by weight percentage, are prepared from the following raw materials: polypropylene meltblown nonwoven fabric: 0.4%, cross-linked phenolic resin powder: 30%, and anhydrous ethanol: 69.6%.

[0083] First, the polypropylene meltblown nonwoven fabric is pulverized to a size no larger than 300μm per piece. Then, cross-linked phenolic resin powder is mixed with anhydrous ethanol. After the phenolic resin powder is completely dissolved, the pulverized meltblown nonwoven fabric is added to the mixture while stirring. The mixture is then cured at 170℃. After curing, the fabric is crushed, shaped, and sieved, and 10-20μm segments are taken for later use.

[0084] Next, three materials were weighed according to their weight percentages: 50% for 15μm silicon carbide micropowder, 2% for 10-20μm pore-forming granulator, and 48% for ceramic binder. These three materials were mixed for 3 hours using a three-dimensional mixer. The mixed material was then added in small batches to a 0.3% HEC aqueous solution (the proportion of the mixed material in the total mass of the mixed material and the 0.3% HEC aqueous solution was 20%–60%, more preferably 30%–50%, and 40% was used in this embodiment). After ultrasonication and stirring for 30 minutes, granulation was performed. Granulation was carried out using a centrifugal atomizing dryer with a blade-type atomizing dispersion disc. Figure 6 The radius of the arc-shaped blades is R = 20 mm. The inlet temperature of the centrifugal atomizing dryer is controlled at 270℃ and the outlet temperature is controlled at 125℃ to obtain granular material.

[0085] Finally, the granular material and analytical grade sodium chloride were mixed evenly at a mass ratio of 2:1 and calcined in a muffle furnace at 800℃ for 6 hours. The calcined material was then washed with pure water multiple times to remove the sodium chloride adhering to the surface of the material. The conductivity was measured to be less than 100 μS / cm. The material was then dried and sieved to obtain the grinding composition for high-speed grinding.

[0086] Example 6

[0087] The high-speed grinding composition of this embodiment is prepared by the following steps:

[0088] First, the pore-forming agent granules are prepared. The pore-forming agent granules, by weight percentage, are prepared from the following raw materials: polypropylene meltblown nonwoven fabric: 0.4%, cross-linked phenolic resin powder: 30%, and anhydrous ethanol: 69.6%.

[0089] First, the polypropylene meltblown nonwoven fabric is pulverized to a size no larger than 300μm per piece. Then, cross-linked phenolic resin powder is mixed with anhydrous ethanol. After the phenolic resin powder is completely dissolved, the pulverized meltblown nonwoven fabric is added to the mixture while stirring. The mixture is then cured at 170℃. After curing, the fabric is crushed, shaped, and sieved, and 10-20μm segments are taken for later use.

[0090] Next, three materials were weighed according to their weight percentages: 50% for 15μm silicon carbide micropowder, 2% for 10-20μm pore-forming granulator, and 48% for ceramic binder. These three materials were mixed for 3 hours using a three-dimensional mixer. The mixed material was then added in small batches to a 0.3% HEC aqueous solution (the proportion of the mixed material in the total mass of the mixed material and the 0.3% HEC aqueous solution was 20%–60%, more preferably 30%–50%, and 40% was used in this embodiment). After ultrasonication and stirring for 30 minutes, granulation was performed. Granulation was carried out using a centrifugal atomizing dryer with a blade-type atomizing dispersion disc. Figure 7 The radius of the arc-shaped blades is R = 10 mm. The inlet temperature of the centrifugal atomizing dryer is controlled at 270℃ and the outlet temperature is controlled at 125℃ to obtain granular material.

[0091] Finally, the granular material and analytical grade sodium chloride were mixed evenly at a mass ratio of 2:1 and calcined in a muffle furnace at 800℃ for 6 hours. The calcined material was then washed with pure water multiple times to remove the sodium chloride adhering to the surface of the material. The conductivity was measured to be less than 100 μS / cm. The material was then dried and sieved to obtain the grinding composition for high-speed grinding.

[0092] Comparative Example 3

[0093] The high-speed grinding composition of this comparative example was prepared by the following steps:

[0094] The other steps are the same as in Example 5, except that granulation is carried out using a centrifugal atomizing dryer, the structure of which is as follows: Figure 1 and Figure 2 As shown, the granulation dispersion disk is a conventional columnar atomizing dispersion disk, and its structure is as follows: Figure 3 and Figure 4 As shown.

[0095] Comparative Example 4

[0096] The high-speed grinding composition of this comparative example was prepared by the following steps:

[0097] The other steps are the same as in Example 5, except that: no pore-forming agent is added in Comparative Example 4, and 15μm silicon carbide and ceramic binder are granulated to obtain spherical particles, with a mass ratio of 50:50 between 15μm silicon carbide and ceramic binder.

[0098] The abrasive compositions of Examples 4-6 and Comparative Examples 3-4 were used to prepare abrasive pads using conventional techniques in the art. The prepared abrasive pads were then used to grind K9 glass on a Kizi single-sided grinder at a pressure of 300 g / cm². 2 Record the grinding removal rate, roughness, and grinding state of K9 glass.

[0099] The test results of the grinding compositions of Examples 4-6 and Comparative Examples 3-4 are shown in Table 2.

[0100] Table 2. Test results of the grinding compositions in Examples 4-6 and Comparative Examples 3-4

[0101]

[0102] Wherein, the grinding composition Mv refers to the average particle size of the grinding composition.

[0103] As can be seen from the comparison of Examples 4, 5, and 6 with Comparative Examples 3 and 4 in Table 2, the selection of the dispersion disk and the curvature of the dispersion disk have a significant impact on the properties of the grinding composition. Specifically, the grinding composition prepared using a blade-type atomizing dispersion disk has a higher removal rate than the grinding composition prepared using a columnar atomizing dispersion disk. The smaller the blade radius and the larger the curvature of the blade-type atomizing dispersion disk, the lower the impact strength and the stronger the self-sharpening property of the prepared grinding composition. When grinding K9 glass, the removal rate is higher and the grinding effect is better.

[0104] In summary, experiments on the Kizi low-speed grinder demonstrate that the grinding composition of the present invention has significant overall advantages.

[0105] The grinding composition of Example 2 was used to make a 585*180 grinding pad and tested on a high-speed grinder. The test results of the grinding composition of Example 2 on the high-speed grinder are shown in Table 3.

[0106] Table 3. Test results of the grinding composition in Example 2 on a high-speed grinding mill.

[0107]

[0108]

[0109] As can be seen from Table 3, the grinding composition of the present invention can achieve a high removal rate and is suitable for high-speed grinding. It will not scratch the glass during the grinding process.

Claims

1. A polishing composition for high-speed polishing, characterized by comprising: The high-speed grinding composition is made by irregular granulation and sintering of 40-50 parts by weight of abrasive, 2-3 parts by weight of pore-forming agent granules, and 48-57 parts by weight of ceramic binder. The sphericity of the granules obtained by irregular granulation is not greater than 0.

8. The pore-forming agent granules are mainly obtained by granulation of polypropylene meltblown nonwoven fabric scraps and cross-linked phenolic resin: the cross-linked phenolic resin is mixed with ethanol to prepare a cross-linked phenolic resin solution; the cross-linked phenolic resin solution is mixed with polypropylene meltblown nonwoven fabric scraps and cured at 120-180℃; after curing, the scraps are crushed, shaped, and sieved to obtain the pore-forming agent granules. The irregular granulation process includes spray drying using a blade-type atomizing dispersion disc, and adjusting the roundness of the granules obtained from the irregular granulation by adjusting the curvature of the blades of the blade-type atomizing dispersion disc.

2. The high-speed polishing abrasive composition according to claim 1, wherein The particle size of the pore-forming agent granules is 10~20μm.

3. The high-speed polishing abrasive composition according to claim 1, wherein The abrasive has a particle size of 15~30μm.

4. The high-speed polishing abrasive composition according to claim 3, wherein The blade radius of the blade-type atomizing dispersion disc is 10~40mm. By reducing the blade radius of the blade-type atomizing dispersion disc, particles with smaller roundness can be obtained.

5. The high-speed polishing abrasive composition according to claim 1 or 3 or 4, characterized by, The roundness of the granules obtained by irregular granulation is 0.40~0.

62.

6. The high-speed polishing abrasive composition according to claim 3 or 4, characterized by, The inlet temperature of the spray dryer is 260~300℃ and the outlet temperature is 120~150℃.

7. The high-speed polishing abrasive composition according to claim 1, wherein The abrasive is one or any combination of diamond, CBN, corundum, silicon carbide, and boron carbide.

8. The high-speed polishing abrasive composition according to claim 1, wherein The mass ratio of the meltblown nonwoven fabric scraps to the cross-linked phenolic resin is (0.2~0.6):(20~40).

9. The grinding composition for high-speed grinding according to claim 1, characterized in that, The sintering temperature is 750~800℃.

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