Anti-clogging ceramic sandpaper and preparation method thereof

Abstract

The present invention relates to the field of coated abrasive technology, specifically to anti-clogging ceramic sandpaper and its preparation method. The technical key features are as follows: from bottom to top, it comprises: latex paper, a base glue, abrasive, a double glue, and an anti-clogging coating. The anti-clogging coating is prepared from the following components, calculated by weight: 30-50 parts aqueous emulsion, 10-15 parts graded filler, 3-5 parts dispersant, 2-3 parts water-soluble curing agent, and 60-70 parts water. The graded filler is ceramic corundum particles with the following gradation: particle size R < 250nm, 1-3%; 250≤R < 350nm, 65-75%; 350nm≤R < 450nm, 15-19%; 450≤R < 550nm, 3-5%. The anti-clogging ceramic sandpaper and its preparation method provided by the present invention significantly enhance the anti-clogging effect of the anti-clogging coating while effectively improving the sharpness and self-sharpening properties of the sandpaper surface.

Description

Technical Field

[0001] The invention relates to the technical field of coated abrasive tools, and in particular to an anti-clogging ceramic sandpaper and a preparation method thereof. Background Art

[0002] Ceramic corundum abrasives are a revolutionary new generation of microcrystalline aluminum oxide abrasives that emerged in the late 20th century. Compared to traditional abrasives, ceramic corundum abrasives possess a unique microstructure, high hardness, great toughness, and excellent self-sharpening properties. They offer high cutting speeds, long grinding life, resistance to workpiece burns, and low energy consumption. Sandpaper products, while offering excellent flexibility and affordability, are suitable for grinding workpieces of various shapes. However, they suffer from a shorter lifespan, primarily due to the increased grinding pressure required after the abrasive tip wears out, which can damage the paper base.

[0003] To address these issues, dense or semi-open planting methods are often used. This method makes coated abrasives relatively hard and brittle, making them prone to clogging during grinding, impacting grinding efficiency and service life. Therefore, most sandpaper is coated with an anti-clogging coating. However, this coating often reduces the self-sharpening properties of the sandpaper and is prone to peeling.

[0004] In view of the above-mentioned defects of existing grinding sandpaper, the inventors, based on their rich experience and professional knowledge in working with such materials for many years, combined with theoretical analysis, conducted research and innovation to develop an anti-clogging ceramic sandpaper and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to develop an anti-clogging ceramic sandpaper. An anti-clogging coating is coated on the surface of the sandpaper. Ceramic corundum particles with gradient particle sizes are used as graded fillers in the coating. Ceramic corundum particles with large particle sizes and small particle sizes are compounded and used so that small-sized ceramic corundum particles are doped between ceramic corundum particles with a particle size range of 350 to 450 nm. Thus, protrusions with a diameter of 350 to 450 nm are orderly formed in the coating, generating a "maze effect" and forming a layer of air cushion, thereby greatly improving the anti-clogging effect of the anti-clogging coating. At the same time, the ceramic corundum particles are used as fillers to effectively improve the self-sharpening property of the sandpaper surface.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] The present invention provides an anti-clogging ceramic sandpaper, which comprises, from bottom to top: latex paper, base glue, abrasive, double glue and anti-clogging coating.

[0008] The anti-clogging coating is prepared from the following components in parts by weight:

[0009] 30-50 parts of aqueous emulsion, 10-15 parts of graded filler, 3-5 parts of dispersant, 2-3 parts of water-soluble curing agent and 60-70 parts of water;

[0010] The graded filler is ceramic corundum particles, and the gradation is as follows: particle size R < 250nm, 1-3%; 250≤R < 350nm, 65-75%; 350nm≤R < 450nm, 15-19%; 450≤R < 550nm, 3-5%.

[0011] Furthermore, the preparation method of the graded filler is as follows: pseudo-boehmite powder and PEG are prepared into a suspension, HNO3 is added thereto, and the suspension is aged to obtain a gel; rare earth composite additives, α-Al2O3 seeds and ZrO2 powder are added to the gel, and the precursor is ground to obtain a precursor; the precursor is calcined in three stages to obtain a graded filler.

[0012] In the present invention, a three-stage calcination is adopted, and the particle size of the grains is controlled by the temperature and holding time of each calcination stage, thereby forming a natural gradation. Compared with the graded filler obtained by later blending, the particles of different sizes are dispersed more evenly, thereby obtaining orderly protrusions and achieving the technical effect of anti-clogging.

[0013] Furthermore, the rare earth composite additive is La2O3, TiO2 and SiO2, and the mass ratio thereof is (1.4-1.5): (1.3-1.4):1.

[0014] In the present invention, the rare earth composite additive is added, and the La, Si, and Ti elements are evenly distributed on the surface of the grains to form a thin film, which can inhibit grain growth and prevent the initiation and expansion of microcracks, reduce stress concentration inside the abrasive, and thus improve the hardness of the abrasive.

[0015] Furthermore, the three-stage calcination is specifically as follows: raising the temperature to 1450-1500°C at a heating rate of 3-4°C / min, and keeping it warm for 10-20 minutes; then lowering the temperature to 1200-1300°C at a cooling rate of 5-7°C / min, and keeping it warm for t1=5-12 hours; then lowering the temperature to 1000-1100°C at a cooling rate of 3-4°C / min, and keeping it warm for t2=5-12 hours.

[0016] In the present invention, the first sintering temperature is 1450-1500°C, during which volume diffusion-controlled sintering occurs within the system, achieving an initial density exceeding 80%. However, if the holding time is too long, sufficient energy can be continuously supplied during the later stages of high-temperature sintering, increasing the proton free energy within the grains. Grain boundary diffusion and rapid grain boundary migration synergistically promote rapid grain growth, which in turn becomes nucleation point for secondary growth, leading to abnormal grain growth and preventing the target gradation achieved by the present invention's technical solution.

[0017] Therefore, the present invention adopts a method of suddenly lowering the temperature to 1200-1300°C, so that volume diffusion and grain boundary diffusion form inside the system to jointly control sintering. As a result, inside the system, a portion of the grains continue to shrink in volume due to the action of the rare earth composite additive, forming densification, while another portion of the grains grow rapidly due to the synergistic effect of grain boundary diffusion and rapid grain boundary migration, and become nucleation points for secondary growth, thereby expanding the range of rapid grain growth. Under the action of La, the grains stop growing when they grow to a certain size, thereby obtaining the large grains required by the present invention.

[0018] The present invention continues to cool down, and at this time the system is completely controlled by the grain boundary diffusion effect. At this time, due to the further decrease in temperature, the La- and Ti-containing aluminosilicate liquid phase increases in viscosity due to the decrease in temperature, and is segregated at the grain boundaries, which will inhibit the growth of some grains, but other grains will continue to grow, thereby obtaining the target graded filler.

[0019] Furthermore, t1 / t2=(mTiO2+mSiO2) / mLa2O3.

[0020] In the present invention, when the sintering temperature is maintained at 1200-1300°C, the viscosity of the La-containing aluminosilicate liquid phase obtained in the first high-temperature sintering stage increases due to the decrease in temperature, causing it to segregate at the crystal interface, resulting in uneven stress distribution and reduced hardness. Therefore, the present invention also incorporates TiO2. The viscosity of the Ti-containing aluminosilicate liquid phase changes little within this temperature range, but when the temperature is reduced to 1000-1100°C, the viscosity of the Ti-containing aluminosilicate liquid phase also increases. Therefore, to achieve the target gradation of the present invention, the holding time of the third and second calcinations is limited by the La, Ti, and Si contents. This can reduce the required amount of grains, thereby achieving the desired technical effect of the present invention.

[0021] Furthermore, the aqueous solution is a water-based acrylic resin. Using a water-based acrylic resin can ensure that the filler can be evenly distributed on the surface of the product without showing any patterns or shrinkage points, and will not contaminate the polished workpiece due to coating shedding, thereby achieving grinding consistency in the application.

[0022] Furthermore, the latex content of the latex paper is ≥30%. Using latex paper with a higher latex content can improve the toughness of the base material.

[0023] Furthermore, the composite glue is a water-soluble phenolic resin containing a water-based epoxy resin toughening agent component.

[0024] Furthermore, the dispersant is sodium fatty alcohol polyoxyethylene ether sulfate.

[0025] The second object of the present invention is to provide a method for preparing anti-clogging ceramic sandpaper, which has the same technical effect.

[0026] The above technical objectives of the present invention are achieved by the following technical solutions:

[0027] The present invention provides a method for preparing anti-clogging ceramic sandpaper, which specifically comprises the following steps:

[0028] S1. Apply primer on the surface of latex paper;

[0029] S2, electrostatic sand planting, drying;

[0030] S3, apply adhesive and dry;

[0031] S4, applying an anti-clogging coating;

[0032] S5, solidification;

[0033] S6, multi-directional kneading.

[0034] Furthermore, the specific steps include:

[0035] S1. Apply adhesive on the surface of latex paper and dry it for 10-20 minutes at a temperature of 70-80°C.

[0036] S2. Apply primer to the lower surface of the latex paper, use static electricity or gravity to apply sand, so that the abrasive particles adhere to the primer, dry it with hot air at 50-70°C, then apply the primer to embed the primer in the abrasive particles, and cure it at 60-80°C for 20-40 minutes to form an abrasive layer.

[0037] S3, sequentially performing a post-curing process and a multi-directional kneading process on the latex paper after the abrasive layer is formed;

[0038] S4. Apply anti-clogging coating and cure.

[0039] Furthermore, in the multi-directional kneading process, the radial kneading in the mechanical kneading is combined with two 45° kneading, and the water content is ≤20g / m 2 After mechanical bending, the curling degree is ≤12mm.

[0040] In summary, the present invention has the following beneficial effects:

[0041] The present invention provides ceramic abrasive sandpaper. It is primarily used in surface coating and paint restoration processes for various vehicles, high-end furniture, and handicrafts. This product utilizes microcrystalline ceramic abrasives as anti-clogging fillers, evenly distributed with conventional abrasives on the paper base. The resulting sandpaper exhibits superior wear resistance and a longer service life. It also exhibits excellent anti-clogging performance, which is over 20% greater than that of existing similar products. DETAILED DESCRIPTION

[0042] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, an anti-clogging ceramic sandpaper and a preparation method thereof proposed in accordance with the present invention, its specific implementation method, characteristics and effects are described in detail as follows.

[0043] Example 1

[0044] The anti-clogging ceramic sandpaper provided in this embodiment comprises, from bottom to top: latex paper, base glue, abrasive, double glue and anti-clogging coating;

[0045] The anti-clogging coating is prepared from the following components in parts by weight:

[0046] 50 parts of water-based acrylic emulsion, 15 parts of graded ceramic corundum particles, 3 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 3 parts of water-soluble curing agent and 70 parts of water;

[0047] The grading of graded ceramic corundum particles is as follows: particle size R<250nm, 1-3%; 250≤R<350nm, 65-75%; 350nm≤R<450nm, 15-19%; 450≤R<550nm, 3-5%.

[0048] The preparation method of graded ceramic corundum particles is as follows:

[0049] 300 g of pseudo-boehmite powder with a particle size of 4 μm and 3 g of PEG1000 were added to 1000 g of water, and the mixture was stirred in a 50°C water bath for 15 min. HNO3 with a concentration of 1 mol / L was added to the white suspension by titration to adjust the pH value to 2.5 to prepare a suspension, and the suspension was aged to obtain a gel. 7 g of a rare earth composite additive, 9 g of α-Al2O3 seeds and 4.5 g of ZrO2 powder were added to the gel, and the mixture was ground to obtain a precursor. The precursor was calcined in three stages to obtain a graded filler, wherein the rare earth composite additive was La2O3, TiO2 and SiO2 in a mass ratio of 1.5:1.3:1.

[0050] The three-stage calcination process involves raising the temperature to 1450°C at a heating rate of 3°C / min and holding for 15 minutes; then cooling it to 1200°C at a cooling rate of 6°C / min and holding for t1 = 552 minutes; and finally cooling it to 1000°C at a cooling rate of 4°C / min and holding for t2 = 300 minutes. t1 / t2 = (mTiO2 + mSiO2) / mLa2O3.

[0051] The preparation method of the anti-clogging ceramic sandpaper provided in this embodiment is as follows:

[0052] S1. Apply adhesive on the surface of latex paper and dry it for 20 minutes at 80℃.

[0053] S2. Apply primer to the lower surface of the latex paper, use gravity single sanding to make the abrasive particles adhere to the primer, dry it with hot air at 70°C, then apply the top coat to embed the top coat in the abrasive particles, and cure it at 80°C for 40 minutes to form an abrasive layer. The abrasive is brown corundum.

[0054] S3. Curing the latex paper after forming the abrasive layer in a curing oven at 110°C for 20 hours, using a combination of radial curving and two 45° curving in mechanical curving, wherein the water content is ≤20g / m2, and the curl after mechanical curving is ≤12mm;

[0055] S4. Apply anti-clogging coating and cure at 80°C for 15 hours.

[0056] The base glue includes acrylic modified epoxy resin, clay, KH550 coupling agent and water in a mass ratio of 100:25:2:30; the top glue includes urea-formaldehyde resin, clay, KH550 coupling agent and water in a mass ratio of 100:20:5:30.

[0057] Example 2

[0058] The anti-clogging ceramic sandpaper provided in this embodiment comprises, from bottom to top: latex paper, base glue, abrasive, double glue and anti-clogging coating;

[0059] The anti-clogging coating is prepared from the following components in parts by weight:

[0060] 50 parts of water-based acrylic emulsion, 10 parts of graded ceramic corundum particles, 3 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 3 parts of water-soluble curing agent and 70 parts of water;

[0061] The grading of graded ceramic corundum particles is as follows: particle size R<250nm, 1-3%; 250≤R<350nm, 65-75%; 350nm≤R<450nm, 15-19%; 450≤R<550nm, 3-5%.

[0062] The preparation method of graded ceramic corundum particles is as follows:

[0063] 300 g of pseudo-boehmite powder with a particle size of 4 μm and 3 g of PEG1000 were added to 1000 g of water, and the mixture was fully stirred in a 50°C water bath for 15 min. HNO3 with a concentration of 1 mol / L was added to the white suspension by titration to adjust the pH value to 2.5 to prepare a suspension, and the suspension was aged to obtain a gel. 7 g of a rare earth composite additive, 9 g of α-Al2O3 seeds and 4.5 g of ZrO2 powder were added to the gel, and the mixture was ground to obtain a precursor. The precursor was calcined in three stages to obtain a graded filler, wherein the rare earth composite additive was La2O3, TiO2 and SiO2 in a mass ratio of 1.4:1.3:1.

[0064] The three-stage calcination process involves raising the temperature to 1500°C at a rate of 3°C / min and holding for 15 minutes; then cooling it down to 1200°C at a rate of 6°C / min and holding for t1 = 493 minutes; and finally cooling it down to 1100°C at a rate of 4°C / min and holding for t2 = 300 minutes. t1 / t2 = (mTiO2 + mSiO2) / mLa2O3.

[0065] The preparation method of the anti-clogging ceramic sandpaper provided in this embodiment is as follows:

[0066] S1. Apply adhesive on the surface of latex paper and dry it for 20 minutes at 80℃.

[0067] S2. Apply primer to the lower surface of the latex paper, use gravity single sanding to make the abrasive particles adhere to the primer, dry it with hot air at 70°C, then apply the top coat to embed the top coat in the abrasive particles, and cure it at 80°C for 40 minutes to form an abrasive layer. The abrasive is brown corundum.

[0068] S3. Curing the latex paper after forming the abrasive layer in a curing oven at 110°C for 20 hours, using a combination of radial curving and two 45° curving in mechanical curving, wherein the water content is ≤20g / m2, and the curl after mechanical curving is ≤12mm;

[0069] S4. Apply anti-clogging coating and cure at 80°C for 15 hours.

[0070] The base glue includes acrylic modified epoxy resin, clay, KH550 coupling agent and water in a mass ratio of 100:25:2:30; the top glue includes urea-formaldehyde resin, clay, KH550 coupling agent and water in a mass ratio of 100:20:5:30.

[0071] Example 3

[0072] The anti-clogging ceramic sandpaper provided in this embodiment comprises, from bottom to top: latex paper, base glue, abrasive, double glue and anti-clogging coating;

[0073] The anti-clogging coating is prepared from the following components in parts by weight:

[0074] 50 parts of water-based acrylic emulsion, 10 parts of graded ceramic corundum particles, 3 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 3 parts of water-soluble curing agent and 60 parts of water;

[0075] The grading of graded ceramic corundum particles is as follows: particle size R<250nm, 1-3%; 250≤R<350nm, 65-75%; 350nm≤R<450nm, 15-19%; 450≤R<550nm, 3-5%.

[0076] The preparation method of graded ceramic corundum particles is as follows:

[0077] 300 g of pseudo-boehmite powder with a particle size of 4 μm and 3 g of PEG1000 were added to 1000 g of water, and the mixture was fully stirred in a 50°C water bath for 15 min. HNO3 with a concentration of 1 mol / L was added to the white suspension by titration to adjust the pH value to 2.5 to prepare a suspension, and the suspension was aged to obtain a gel. 7 g of a rare earth composite additive, 9 g of α-Al2O3 seeds and 4.5 g of ZrO2 powder were added to the gel, and the mixture was ground to obtain a precursor. The precursor was calcined in three stages to obtain a graded filler, wherein the rare earth composite additive was La2O3, TiO2 and SiO2 in a mass ratio of 1.4:1.3:1.

[0078] The three-stage calcination process involves raising the temperature to 1500°C at a rate of 3°C / min and holding for 15 minutes; then cooling it down to 1200°C at a rate of 6°C / min and holding for t1 = 493 minutes; and finally cooling it down to 1100°C at a rate of 4°C / min and holding for t2 = 300 minutes. t1 / t2 = (mTiO2 + mSiO2) / mLa2O3.

[0079] The preparation method of the anti-clogging ceramic sandpaper provided in this embodiment is as follows:

[0080] S1. Apply adhesive on the surface of latex paper and dry it for 20 minutes at 80℃;

[0081] S2. Apply primer to the lower surface of the latex paper, use gravity single sanding to make the abrasive particles adhere to the primer, dry it with hot air at 70°C, then apply the top coat to embed the top coat in the abrasive particles, and cure it at 80°C for 40 minutes to form an abrasive layer. The abrasive is brown corundum.

[0082] S3. Curing the latex paper after forming the abrasive layer in a curing oven at 110°C for 20 hours, using a combination of radial curving and two 45° curving in mechanical curving, wherein the water content is ≤20g / m2, and the curl after mechanical curving is ≤12mm;

[0083] S4. Apply anti-clogging coating and cure at 80°C for 15 hours.

[0084] The base glue includes acrylic modified epoxy resin, clay, KH550 coupling agent and water in a mass ratio of 100:25:2:30; the top glue includes urea-formaldehyde resin, clay, KH550 coupling agent and water in a mass ratio of 100:20:5:30.

[0085] Comparative Example 1

[0086] The anti-clogging ceramic sandpaper provided in this embodiment comprises, from bottom to top: latex paper, base glue, abrasive, double glue and anti-clogging coating;

[0087] The anti-clogging coating is prepared from the following components in parts by weight:

[0088] 50 parts of water-based acrylic emulsion, 15 parts of ceramic corundum particles, 3 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 3 parts of water-soluble curing agent and 70 parts of water.

[0089] The preparation method of ceramic corundum particles is as follows:

[0090] 300 g of pseudo-boehmite powder with a particle size of 4 μm and 3 g of PEG1000 were added to 1000 g of water, and the mixture was fully stirred in a 50°C water bath for 15 min. HNO3 with a concentration of 1 mol / L was added to the white suspension by titration to adjust the pH value to 2.5 to prepare a suspension, and the suspension was aged to obtain a gel. 7 g of a rare earth composite additive, 9 g of α-Al2O3 seeds and 4.5 g of ZrO2 powder were added to the gel, and the mixture was ground to obtain a precursor. The precursor was calcined, the temperature was raised to 1500°C at a heating rate of 3°C / min, the mixture was kept warm for 700 min, and the mixture was cooled with the furnace to obtain a graded filler, wherein the rare earth composite additive was La2O3, TiO2 and SiO2 in a mass ratio of 1.4:1.3:1.

[0091] The preparation method of the anti-clogging ceramic sandpaper provided in this embodiment is as follows:

[0092] S1. Apply adhesive on the surface of latex paper and dry it for 20 minutes at 80℃;

[0093] S2. Apply primer to the lower surface of the latex paper, use gravity single sanding to make the abrasive particles adhere to the primer, dry it with hot air at 70°C, then apply the top coat to embed the top coat in the abrasive particles, and cure it at 80°C for 40 minutes to form an abrasive layer. The abrasive is brown corundum.

[0094] S3. After forming the abrasive layer, the latex paper was cured in a curing oven at 110°C for 20 hours, using a combination of radial bending and two 45° bending in mechanical bending, with the water content ≤20g / m 2 , after mechanical bending, the curl degree is ≤12mm;

[0095] S4. Apply anti-clogging coating and cure at 80°C for 15 hours.

[0096] The base glue includes acrylic modified epoxy resin, clay, KH550 coupling agent and water in a mass ratio of 100:25:2:30; the top glue includes urea-formaldehyde resin, clay, KH550 coupling agent and water in a mass ratio of 100:20:5:30.

[0097] Comparative Example 2

[0098] The anti-clogging ceramic sandpaper provided in this embodiment comprises, from bottom to top: latex paper, base glue, abrasive, double glue and anti-clogging coating;

[0099] The anti-clogging coating is prepared from the following components in parts by weight:

[0100] 50 parts of water-based acrylic emulsion, 15 parts of graded ceramic corundum particles, 3 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 3 parts of water-soluble curing agent and 70 parts of water.

[0101] The preparation method of graded ceramic corundum particles is as follows:

[0102] 300 g of pseudo-boehmite powder with a particle size of 4 μm and 3 g of PEG1000 were added to 1000 g of water, and the mixture was fully stirred in a 50°C water bath for 15 min. HNO3 with a concentration of 1 mol / L was added to the white suspension by titration to adjust the pH value to 2.5 to prepare a suspension, and the suspension was aged to obtain a gel. 7 g of a rare earth composite additive, 9 g of α-Al2O3 seeds and 4.5 g of ZrO2 powder were added to the gel, and the mixture was ground to obtain a precursor. The precursor was calcined in two stages to obtain a graded filler, wherein the rare earth composite additive was La2O3, TiO2 and SiO2 in a mass ratio of 1.4:1.3:1.

[0103] The three-stage calcination is specifically as follows: the temperature is raised to 1500°C at a heating rate of 3°C / min and kept at this temperature for 15 minutes; then the temperature is lowered to 1200°C at a cooling rate of 6°C / min, kept at this temperature for t1=600 minutes, and then cooled with the furnace.

[0104] The preparation method of the anti-clogging ceramic sandpaper provided in this embodiment is as follows:

[0105] S1. Apply adhesive on the surface of latex paper and dry it for 20 minutes at 80℃;

[0106] S2. Apply primer to the lower surface of the latex paper, use gravity single sanding to make the abrasive particles adhere to the primer, dry it with hot air at 70°C, then apply the top coat to embed the top coat in the abrasive particles, and cure it at 80°C for 40 minutes to form an abrasive layer. The abrasive is brown corundum.

[0107] S3. Curing the latex paper after forming the abrasive layer in a curing oven at 110°C for 20 hours, using a combination of radial curving and two 45° curving in mechanical curving, wherein the water content is ≤20g / m2, and the curl after mechanical curving is ≤12mm;

[0108] S4. Apply anti-clogging coating and cure at 80°C for 15 hours.

[0109] The base glue includes acrylic modified epoxy resin, clay, KH550 coupling agent and water in a mass ratio of 100:25:2:30; the top glue includes urea-formaldehyde resin, clay, KH550 coupling agent and water in a mass ratio of 100:20:5:30.

[0110] Performance Testing

[0111] The test results of the above embodiments and comparative examples are shown in Table 1 below.

[0112] Table 1 Performance test results of comparative examples

[0113] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Radial breaking strength N / 5cm 312 315 314 314 313 Weft breaking strength N / 5cm 139 142 143 137 135 Gold removal g / 5 times 4.5 4.7 4.8 3.1 3.7 Desanding amount g / 5 times 0.12 0.12 0.11 1.2 1.4

[0114] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been presented as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An anti-clogging ceramic sandpaper, characterized in that, From bottom to top, it includes: latex paper, primer, abrasive, double glue and anti-clogging coating, wherein, calculated by weight, the anti-clogging coating is prepared from the following components: 30-50 parts of aqueous emulsion, 10-15 parts of graded filler, 3-5 parts of dispersant, 2-3 parts of water-soluble curing agent and 60-70 parts of water; The graded filler is ceramic corundum particles, and the gradation is as follows: particle size R < 250nm, 1~3%; 250≤R < 350nm, 65~75%; 350nm≤R < 450nm, 15~19%; 450≤R < 550nm, 3~5%; The preparation method of the graded filler is as follows: pseudo-boehmite powder and PEG are prepared into a suspension, HNO3 is added thereto, and the suspension is aged to obtain a gel; a rare earth composite additive containing La, Si, and Ti elements, α-Al2O3 seeds, and ZrO2 powder are added to the gel, and the gel is ground to obtain a precursor; and the precursor is calcined in three stages to obtain the graded filler.

2. The anti-clogging ceramic sandpaper according to claim 1, characterized in that: The rare earth composite additive is La2O3, TiO2 and SiO2, and the mass ratio thereof is (1.4-1.5): (1.3-1.4):

1.

3. The anti-clogging ceramic sandpaper according to claim 1, characterized in that: The three-stage calcination is specifically as follows: raising the temperature to 1450-1500°C at a heating rate of 3-4°C / min and keeping it warm for 10-20 minutes; then lowering the temperature to 1200-1300°C at a cooling rate of 5-7°C / min and keeping it warm for t1=5-12 hours; then lowering the temperature to 1000-1100°C at a cooling rate of 3-4°C / min and keeping it warm for t2=5-12 hours.

4. The anti-clogging ceramic sandpaper according to claim 3, characterized in that: t1 / t2=(mTiO2+mSiO2) / mLa2O3.

5. The anti-clogging ceramic sandpaper according to claim 1, characterized in that: The aqueous emulsion is an aqueous acrylic resin.

6. The anti-clogging ceramic sandpaper according to claim 1, characterized in that: The latex content of the latex paper is ≥30%.

7. The anti-clogging ceramic sandpaper according to claim 1, characterized in that: The composite glue is a water-soluble phenolic resin containing a water-based epoxy resin toughening agent component.

8. The method for preparing anti-clogging ceramic sandpaper according to any one of claims 1 to 7, characterized in that: The specific steps include: S1. Applying primer on the pre-treated latex paper surface; S2, electrostatic sand planting; S3, pre-drying; coating and re-adhesion; S4, drying; applying anti-clogging coating; S5, solidification; S6, multi-directional kneading.

9. The method for preparing anti-clogging ceramic sandpaper according to claim 8, characterized in that: In step S6, radial kneading and two 45° kneading are combined in mechanical kneading, wherein the water content is ≤20g / m 2 After mechanical bending, the curling degree is ≤12mm.