A composite sanding paper and a method of making the same

Abstract

This invention discloses a composite abrasive cloth and its preparation method, the process of which is as follows: A sand-planting device is used to implant abrasives of different particle sizes and / or different types onto a base adhesive, thereby distributing the abrasives of different particle sizes and / or different types in a longitudinal strip pattern on the surface of the substrate, forming several longitudinal abrasive surfaces, with adjacent abrasive surfaces having different abrasive particle sizes and / or abrasive types; the sand-planting device includes a sand box, an upper electrode plate, a lower electrode plate, and a sand conveying belt. The lower electrode plate is located below the sand conveying belt, and the substrate is located below the upper electrode plate and opposite to the sand conveying belt. The sand box is provided with several sand box partitions to divide the sand box into several sand-loading units, and the sand conveying belt is provided with several sand conveying belt partitions to divide the sand conveying belt into several conveying units. The abrasive falls from the sand outlet at the bottom of the sand-loading unit into the corresponding conveying unit. The sand conveying belt moves parallel to and towards the substrate, and under the action of an electric field, the abrasive on the sand conveying belt is adsorbed onto the surface of the substrate.

Description

Technical Field

[0001] This invention belongs to the field of abrasives and grinding tools, specifically relating to a composite abrasive cloth and its preparation method. Background Technology

[0002] Abrasive cloth: refers to abrasive tools made by adhering abrasive to a flexible substrate with an adhesive, also known as flexible abrasive tools. It has the characteristics of good flexibility, ease of use, high grinding efficiency, low production cost, and short production cycle.

[0003] Composite abrasive cloth: refers to abrasive cloth with two or more types of longitudinal abrasive surfaces, and the abrasive grain size and / or abrasive type are different in different types of abrasive surfaces.

[0004] As my country transforms from a "manufacturing giant" to a "manufacturing powerhouse," the domestic manufacturing industry will further upgrade and consolidate its advantages through the transformation of traditional manufacturing sectors, and improve its manufacturing capabilities through technological innovation. Upgrading and advanced manufacturing place increasingly higher demands on the processing precision and efficiency of parts and products. In the future, abrasive cloth will inevitably develop towards higher efficiency and higher precision.

[0005] Composite abrasive cloth is mainly used for workpiece materials that require two or more grinding passes, including: metal materials, wood, ceramics, plastics, leather, rubber, and non-metallic materials such as paint and putty, for grinding, polishing, and sanding.

[0006] Because the surface of the grinding wheel has sanding surfaces with different grit sizes and / or different types of abrasives along its longitudinal direction, and different sanding surfaces can meet different processing requirements, for workpieces requiring multiple grinding passes, when the sanding hand or robotic arm performs the grinding operation, only one sander and one piece of sanding cloth are needed to grind on different types of sanding surfaces in sequence, which can meet the requirements of multiple processing passes. It has the characteristics of high grinding efficiency, low processing cost, and ease of use.

[0007] Existing abrasive cloths only offer one grit size or type of abrasive. When grinding a workpiece, the surface finish after just one pass is often insufficient to meet processing requirements. It is necessary to use abrasive cloths with different grit sizes and / or different types of abrasives for two or more passes to ensure the workpiece's surface finish meets the requirements. Currently, the grinding method for workpieces requiring multiple passes involves using multiple sanders equipped with different types of abrasive cloths to perform grinding separately to meet processing needs. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a composite abrasive cloth and its preparation method. Because the grinding wheel surface has abrasive surfaces with different longitudinal grit sizes and / or different types of abrasives, and different abrasive surfaces can meet different machining accuracy requirements, for workpieces requiring multi-pass grinding, only one sander and one abrasive cloth are needed for grinding operations performed by a sander or robotic arm. Grinding on different types of abrasive surfaces sequentially can meet the multi-pass machining accuracy requirements. It features high grinding efficiency, low processing cost, and ease of use.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A sand-planting device includes a sand box, an upper electrode plate, a lower electrode plate, and a sand conveying belt. The lower electrode plate is located below the sand conveying belt, and the substrate is located below the upper electrode plate and opposite to the sand conveying belt. The sand box is provided with several sand box partitions to divide the sand box into several sand-loading units. The sand conveying belt is provided with several sand conveying belt partitions to divide the sand conveying belt into several conveying units. The abrasive falls from the sand outlet at the bottom of the sand-loading unit into the corresponding conveying unit. The sand conveying belt and the substrate move in parallel and towards each other. Under the action of electric field force, the abrasive on the sand conveying belt is adsorbed onto the surface of the substrate.

[0011] Furthermore, the shape of the sand box partition is consistent with the shape of the longitudinal section inside the sand box; specifically, the width of the sand box partition is 5mm.

[0012] Furthermore, the sand box partition is made of 45# steel, and the top of the sand box partition is provided with a fixing buckle, which can fix it inside the sand box to prevent displacement.

[0013] Furthermore, the sand conveyor belt partition is a flexible strip that can be wound longitudinally on the sand conveyor belt, with a height of 20mm and a width of 5mm.

[0014] Furthermore, the sand conveyor belt partition is made of high-pressure resistant polyester material.

[0015] Furthermore, the sand conveyor belt partition is provided with connecting buckles at both ends, which can be tightly wrapped around the sand conveyor belt to prevent displacement.

[0016] The method for preparing composite sandpaper using the above-mentioned sand-planting device is as follows:

[0017] (1) Apply the primer to the surface of the substrate;

[0018] (2) Abrasives of different grit sizes and / or different types of abrasives are implanted into the substrate using a sand-planting device, so that abrasives of different grit sizes and / or different types of abrasives are distributed longitudinally on the substrate surface, forming several longitudinal sand surfaces, and the abrasive grit size and / or abrasive type in adjacent sand surfaces are different.

[0019] The specific process is as follows: different particle sizes and / or different types of abrasives are loaded into the sand loading unit, so that the particle size and / or type of abrasives loaded into two adjacent sand loading units are different. Different particle sizes and / or different types of abrasives fall from the sand inlet at the bottom of the sand loading unit into the corresponding conveying unit. The sand conveying belt moves parallel to the substrate and towards each other. Under the action of electric field force, the abrasives on the sand conveying belt are adsorbed onto the surface of the substrate. Different particle sizes and / or different types of abrasives are longitudinally distributed on the substrate surface, forming several longitudinal sand surfaces.

[0020] (3) Pre-drying, applying adhesive, main drying, curing, kneading, and resting.

[0021] Furthermore, the abrasive grain size of different rows of the same grinding wheel can differ by a maximum of 2 grain size numbers; the width of the abrasive surface is between 5cm and 82cm, and the number of abrasive surfaces is between 2 and 31.

[0022] Furthermore, the abrasive is corundum-based or silicon carbide-based abrasive with a particle size of 8 mesh to 1200 mesh.

[0023] Furthermore, the abrasive grain loading is 80–1000 g / m³. 2 The gap between the sand box and the sand inlet is 1500-4000μm.

[0024] Furthermore, the sand conveyor belt operates at a speed of 2–6 m / min, and the substrate operates at a speed of 10–50 m / min.

[0025] The composite abrasive cloth prepared by the above method has a longitudinal strip distribution of abrasive surfaces formed by abrasives of different particle sizes and / or different types, and the abrasive particle size and / or abrasive type are different in adjacent rows of abrasive surfaces.

[0026] The substrate, located at the bottom layer of the abrasive cloth, serves to support the abrasive and impart flexibility to the cloth. The substrate is made of treated polyester, pure cotton, or a polyester-cotton blend. The substrate's weight is 200–800 g / m². 2 The base adhesive layer adheres to the surface of the substrate, bonding the abrasive and the substrate together, thus acting as a bridge.

[0027] The design of the abrasive surface morphology of composite abrasive cloth and the design of the electrostatic abrasive coating device in the production system have a significant impact on product performance. The abrasive surface morphology of the abrasive cloth is distributed longitudinally in strips, with different abrasive grit sizes and / or types in adjacent rows, allowing different rows to meet different grinding requirements. The number of longitudinal abrasive surfaces, the width of each row, the type of abrasive in the surface, and the abrasive grit size are mainly designed based on the requirements of the abrasive cloth for the workpiece being ground. For example, when machining 304 stainless steel castings, the rough grinding process requires removing burrs or weld seams. At this stage, the machining allowance is large, the grinding pressure is high, and the grinding heat is high; therefore, ceramic corundum-P40 abrasive cloth, which has high processing efficiency and low grinding heat, is typically used. In subsequent semi-precision machining, the machining allowance is small, the grinding pressure is lower, and the grinding heat is low; generally, processing efficiency and abrasive cloth lifespan are prioritized, and zirconium corundum-P60 abrasive cloth is typically used. When the total width of the abrasive cloth used with the grinding machine is 20cm, the shape design of the product of this invention is as follows: there are 2 longitudinal abrasive surfaces, each row of abrasive surfaces is 10cm wide, the total width of the grinding wheel is 20cm, and the abrasive types in adjacent rows of abrasive surfaces are ceramic corundum-P40 and zirconium corundum-P60, respectively. This invention can simultaneously achieve the above two or more processing steps on a single sander, meeting the requirements for abrasive cloth characteristics, thereby improving processing efficiency, improving processing accuracy, and reducing processing costs.

[0028] The preparation method of composite abrasive cloth is similar to that of conventional abrasive cloth, including: applying a base coat, abrasive planting, pre-drying, applying a top coat (super coating), main drying, curing, flexing, and resting. The abrasive planting device in the abrasive planting process is similar to a conventional device, but with the following difference: the abrasive planting device in the production system is modified by using a sand box partition and a conveyor belt partition to provide lateral physical isolation between the abrasive in the sand box and the abrasive on the conveyor belt, ensuring that the abrasive particle size and / or abrasive type are different on both sides of the partition. After the abrasive in the sand box falls onto the conveyor belt through the abrasive outlet, the conveyor belt moves parallel to the substrate and towards it. Under the action of an electric field, the abrasive on the conveyor belt is adsorbed onto the substrate surface. Because the partitions provide lateral physical isolation between different particle sizes and / or types of abrasive, the abrasive of different sizes and / or types is longitudinally distributed on the substrate surface, forming several longitudinal abrasive surfaces. The number of partitions in the sand box and conveyor belt, the spacing between the partitions, and the abrasive type on both sides of the partitions determine the morphology of the abrasive cloth surface.

[0029] This invention relates to a composite abrasive cloth, comprising a cloth body, the cloth body including a substrate, a base layer, a composite abrasive layer, and a top layer, with an option to add an overcoat layer depending on the specific application scenario.

[0030] The base adhesive layer adheres to the surface of the substrate; the composite abrasive layer is embedded in the base adhesive layer; the top adhesive layer covers the surface of the composite abrasive layer; and the super coating layer covers the surface of the top adhesive layer.

[0031] The composite abrasive layer contains multiple rows of longitudinally spaced abrasives of different sizes and / or different types.

[0032] This invention does not have special requirements for the base adhesive and top adhesive used on the abrasive cloth; existing abrasive cloth adhesives can meet the requirements.

[0033] For example, the base adhesive formulation consists of the following components by weight: 30-60 parts binder, 20-40 parts filler, 1-2 parts defoamer, 1-2 parts surfactant, 1-2 parts thickener, and 1 part pigment.

[0034] In the primer formulation, the binder is water-soluble phenolic resin, the filler is one or both of wollastonite and calcium carbonate, the defoamer is polyether-modified silicone oil, the surfactant is fatty alcohol polyoxyethylene ether, the thickener is polyvinyl alcohol, and the pigment is iron oxide black.

[0035] The adhesive formulation consists of the following components by weight: 30-60 parts binder, 20-40 parts filler, 1-2 parts defoamer, 1-2 parts surfactant, 1-2 parts thickener, and 1 part pigment.

[0036] In the aforementioned adhesive formulation, the binder is water-soluble phenolic resin, the filler is one or more of wollastonite, cryolite, potassium fluoroborate, and sodium fluoroborate, the defoamer is polyether-modified silicone oil, the surfactant is fatty alcohol polyoxyethylene ether, the thickener is polyvinyl alcohol, and the pigment is iron oxide black.

[0037] Depending on the specific application scenario, it is possible to choose whether to apply a super coating layer to the surface of the mold. The super coating formulation consists of the following components by weight: 20-40 parts binder, 40-60 parts filler, 1-2 parts defoamer, and 1-2 parts surfactant.

[0038] In the supercoating formulation, the binder is phenolic resin, the filler is one or more of cryolite, potassium fluoroborate, sodium fluoroborate, zinc stearate, and calcium stearate, the defoamer is polyether-modified silicone oil, and the surfactant is fatty alcohol polyoxyethylene ether.

[0039] Base adhesive: It bonds the abrasive and the substrate together, acting as a bridge;

[0040] Coating: Applied to the surface of the abrasive to improve the substrate's holding power over the abrasive and prevent the abrasive from falling off completely during grinding.

[0041] Supercoating: Applied to the surface of the adhesive layer, giving the abrasive certain special properties, such as heat dissipation, anti-clogging, and anti-static properties.

[0042] Existing abrasive cloths can only meet one processing requirement, while the composite abrasive cloth of this invention can meet two or more processing requirements. Therefore, there is no similar technology in the prior art to the product involved in this invention.

[0043] This invention proposes a composite abrasive cloth. Because the abrasive surface has longitudinally varying grit sizes and / or different types of abrasive, and these different abrasive surfaces can meet different machining accuracy requirements, for workpieces requiring multi-pass grinding, only one sander and one abrasive cloth are needed for sanding operations by hand or robotic arm. Grinding on different types of abrasive surfaces sequentially can meet the accuracy requirements of multiple passes. It features high grinding efficiency, low processing cost, and ease of use. This invention can simultaneously achieve the abrasive cloth characteristic requirements of two or more processing steps on a single sander, thereby improving processing efficiency, increasing processing accuracy, and reducing processing costs. Attached Figure Description

[0044] Figure 1 This is a front view of the electrostatic sand-planting device; Figure 1 In the middle, both the substrate and the sand conveyor belt move outwards;

[0045] Figure 2 This is a side view of the electrostatic sand-planting device;

[0046] Figure 3 This is the main view of the composite sanding cloth.

[0047] Figure 4 This is a top view of composite sanding cloth.

[0048] In the figure, 1. Abrasive A, 2. Abrasive B, 3. Sand box, 4. Sand box partition, 5. Fixing buckle, 6. Upper electrode plate, 7. Lower electrode plate, 8. Substrate, 9. Sand conveyor belt, 10. Sand conveyor belt partition, 11. Sand surface, 12. Electric field. Detailed Implementation

[0049] Example 1:

[0050] The method for preparing a composite abrasive cloth in this embodiment is similar to the conventional abrasive cloth preparation method, except for the sand planting system. It includes: applying a base coat, sand planting, pre-drying, applying a top coat (super coating), main drying, curing, flexing, and resting.

[0051] The substrate is polyester fabric with a single unit weight of 500g / m². 2 The substrate has a width of 140cm.

[0052] In the primer application process, the primer application amount is 160g / m². 2 The base adhesive formulation, by weight percentage, consists of: 55 parts phenolic resin, 40 parts wollastonite, 1.5 parts polyether-modified silicone oil, 1.5 parts fatty alcohol polyoxyethylene ether, 1 part polyvinyl alcohol, and 1 part iron oxide black, prepared according to existing processes.

[0053] In the adhesive coating process, the coating amount is 200g / m². 2The compounding formula is as follows by weight percentage: 55 parts phenolic resin, 40 parts cryolite, 1.5 parts polyether modified silicone oil, 1.5 parts fatty alcohol polyoxyethylene ether, 1 part polyvinyl alcohol, and 1 part iron oxide black, prepared according to existing processes.

[0054] In the supercoating process, the supercoating amount is 380g / m². 2 The super coating formulation, by weight percentage, consists of 37 parts phenolic resin, 60 parts potassium fluoroborate, 1 part polyether-modified silicone oil, and 2 parts fatty alcohol polyoxyethylene ether, prepared according to existing processes.

[0055] The sand planting device is similar to a normal sand planting device, except that the sand planting device in the production system is modified by using a sand box partition 4 and a sand conveyor belt partition 10 to physically separate the abrasive in the sand box 3 and the abrasive on the sand conveyor belt 9, respectively, to ensure that the abrasive particle size and / or abrasive type on both sides of the partition are different. Specifically, as shown in the figure... Figure 1 and Figure 2 As shown, the sand-planting device includes a sand box 3, an upper electrode plate 6, a lower electrode plate 7, and a sand conveying belt 9. The lower electrode plate 7 is located below the sand conveying belt 9. The substrate 8, coated with primer, is located below the upper electrode plate 6 and is positioned opposite to the sand conveying belt 9. The sand box 3 is provided with several sand box partitions 4, which divide the sand box 3 into several sand-loading units. Adjacent sand-loading units are respectively loaded with different types of abrasives—abrasive A1 and abrasive A2. The sand conveying belt 3 is provided with several sand conveying belt partitions 10, which divide the sand conveying belt 9 into several conveying units. Different types of abrasives fall from the sand outlet at the bottom of the sand-loading unit into the corresponding conveying unit. The sand conveying belt 9 and the substrate 8 move in parallel and towards each other. Under the action of the electric field 12, the abrasives on the sand conveying belt 9 are adsorbed onto the surface of the substrate 8. Abrasives A1 and Abrasive B2 are longitudinally distributed on the surface of the substrate 8, forming several longitudinal sand surfaces 11. The final sand cloth is as shown. Figure 3 and Figure 4 As shown.

[0056] In this embodiment, the shape of the sand box partition 4 is consistent with the internal cross-sectional shape of the sand box 3, and the width of the sand box partition 4 is 5mm; the material of the sand box partition 4 is 45 steel; the top of the sand box partition has a fixing buckle 5, which can fix it inside the sand box 3 to prevent displacement.

[0057] In this embodiment, the sand conveyor belt partition 10 is a flexible strip that can be longitudinally wound onto the sand conveyor belt 9, with a height of 20mm and a width of 5mm; the sand conveyor belt partition 10 is made of high-pressure resistant polyester material; the sand conveyor belt partition 10 has connecting buckles at both ends, which can be tightly wound onto the sand conveyor belt 9 to prevent displacement; the spacing between the partitions of the sand box 3 or the sand conveyor belt 9 is 5cm, and the number of partitions is 27.

[0058] The abrasive types on both sides of the sand box partition 4 or the sand conveyor belt partition 10 are: zirconium corundum-P36 and zirconium corundum-P50.

[0059] The process parameters of the sand-planting system are: the sand-planting amount of the product is 650g / m³. 2 The gap between the sand box and the sand inlet is 2800μm, the sand conveyor belt runs at a speed of 3m / min, and the substrate runs at a speed of 25m / min.

[0060] The large roll of abrasive cloth prepared in Example 1 was cut into 10cm*2100cm pieces and mounted on a sander for grinding tests. The sander speed was 30m / s, the contact wheel hardness was 75°, and the grinding object was a 304 stainless steel workpiece that required two sanding processes using zirconium corundum-P36 and zirconium corundum-P50 abrasive cloths. The surface morphology of 10 workpieces after grinding and the time consumed in the grinding operation were recorded.

[0061]

[0062] Comparative Example 1:

[0063] The comparative examples were produced under the same production conditions as in Example 1, using zirconium-alumina-P36 and zirconium-alumina-P50 abrasive cloths (without partitions on the sand box and conveyor belt, i.e., using existing abrasive feeding devices to produce single-surface zirconium-alumina-P36 and zirconium-alumina-P50 abrasive cloths). These were installed on two sanding machines with the same grinding parameters as in Example 1. The grinding objects were 304 stainless steel workpieces requiring two sanding cycles using zirconium-alumina-P36 and zirconium-alumina-P50 abrasive cloths. The surface morphology and total grinding time of 10 workpieces after grinding were statistically analyzed.

[0064]

[0065] As can be seen from Example 1 and Comparative Example 1, the composite abrasive cloth of this application can significantly improve the grinding efficiency of the workpiece and shorten the grinding time.

[0066] Example 2:

[0067] The sand planting device is the same as in Embodiment 1, except that the spacing between the sand box or sand conveyor belt partitions is 10cm and the number of partitions is 14.

[0068] The abrasive types on both sides of the sand box or sand conveyor belt partition are: ceramic corundum-P40 and zirconium corundum-P60.

[0069] The base adhesive, top adhesive, and coating were all produced according to the production process and formula of Example 1.

[0070] The composite abrasive cloth roll prepared in Example 2 was cut into 20cm*2100cm abrasive cloths and installed on a sander for grinding tests. The sander speed was 30m / s, the contact wheel hardness was 75°, the grinding pressure was 100N, and the grinding object was a 304 stainless steel casting. The grinding requirements were to first use ceramic corundum-P40 abrasive cloth for rough grinding to remove burrs, and then use zirconium corundum-P60 abrasive cloth for semi-finish grinding to repair the appearance of the workpiece and form a certain degree of smoothness.

[0071] The surface morphology of 10 workpieces after grinding (workpiece surface roughness Ra < 0.1 mm indicates that the workpiece morphology is qualified) and the time consumed by the grinding operation were statistically analyzed.

[0072]

[0073] Comparative Example 2:

[0074] Comparative Example 2 products are single-surface ceramic corundum-P40 abrasive cloth and zirconium corundum-P60 abrasive cloth produced using the same production process as Example 2 (the difference is that the sand planting device is different. In the production of Comparative Example 2, there are no partitions on the sand box and the sand conveyor belt, that is, the existing sand planting device is used). They are installed on two sanding machines respectively. The grinding parameters and grinding conditions of the sanding machines are the same as those in Example 2.

[0075] The grinding object is a 304 stainless steel casting. The grinding requirements are to first use ceramic corundum-P40 abrasive cloth for rough grinding to remove burrs, and then use zirconia corundum-P60 abrasive cloth for semi-finish grinding to repair the appearance of the workpiece and form a certain degree of smoothness.

[0076] The surface morphology of 10 workpieces after grinding (workpiece surface roughness Ra < 0.1 mm indicates that the workpiece morphology is qualified) and the time consumed by the grinding operation were statistically analyzed.

[0077]

[0078] As can be seen from Example 2 and Comparative Example 2, the composite abrasive cloth of this application can significantly improve the grinding efficiency of the workpiece and shorten the grinding time.

Claims

1. A method for preparing composite abrasive cloth using a sand-planting device, characterized in that, The sand-planting device includes a sand box, an upper electrode plate, a lower electrode plate, and a sand conveying belt. The lower electrode plate is located below the sand conveying belt, and the substrate is located below the upper electrode plate and opposite to the sand conveying belt. The sand box is provided with several sand box partitions to divide the sand box into several sand-loading units. The sand conveying belt is provided with several sand conveying belt partitions to divide the sand conveying belt into several conveying units. The abrasive falls from the bottom sand inlet of the sand-loading unit into the corresponding conveying unit. The sand conveying belt and the substrate move in parallel and opposite directions. Under the action of the electric field force, the abrasive on the sand conveying belt is adsorbed onto the surface of the substrate. The shape of the sand box partition is consistent with the internal cross-sectional shape of the sand box. The two ends of the top of the sand box partition are fixed to the sand box by fixing buckles. The sand conveying belt partition is made of flexible material, and the two ends of the sand conveying belt partition are provided with connecting buckles. The sand conveying belt partition is wrapped tightly around the sand conveying belt by the connecting buckles. The specific preparation process is as follows: (1) Apply the primer to the surface of the substrate; (2) Abrasives of different grit sizes and / or different types of abrasives are implanted into the substrate using a sand-planting device, so that abrasives of different grit sizes and / or different types of abrasives are distributed longitudinally on the substrate surface, forming several longitudinal sand surfaces, and the abrasive grit size and / or abrasive type in adjacent sand surfaces are different. The specific process is as follows: different particle sizes and / or different types of abrasives are loaded into the sand loading unit, so that the particle size and / or type of abrasives loaded into two adjacent sand loading units are different. Different particle sizes and / or different types of abrasives fall from the sand inlet at the bottom of the sand loading unit into the corresponding conveying unit. The sand conveying belt moves parallel to the substrate and towards each other. Under the action of electric field force, the abrasives on the sand conveying belt are adsorbed onto the surface of the substrate. Different particle sizes and / or different types of abrasives are longitudinally distributed on the substrate surface, forming several longitudinal sand surfaces. (3) Pre-drying, applying adhesive, main drying, curing, kneading, and resting; The abrasive grit size of different rows of the same grinding wheel may differ by a maximum of two grit sizes; the width of the abrasive surface is between 5 cm and 82 cm, and the number of abrasive surfaces is between 2 and 31; the abrasive is corundum or silicon carbide, with a grit size of 8 mesh to 1200 mesh; the abrasive loading is 80 to 1000 g / m². 2 The gap between the sand box and the sand inlet is 1500~4000 μm; The sand conveyor belt operates at a speed of 2~6 m / min, and the substrate operates at a speed of 10~50 m / min; The base adhesive formulation consists of the following components by weight: 30-60 parts binder, 20-40 parts filler, 1-2 parts defoamer, 1-2 parts surfactant, 1-2 parts thickener, and 1 part pigment. The binder is water-soluble phenolic resin, the filler is one or both of wollastonite and calcium carbonate, the defoamer is polyether-modified silicone oil, the surfactant is fatty alcohol polyoxyethylene ether, the thickener is polyvinyl alcohol, and the pigment is iron oxide black. The composite adhesive formulation comprises, by weight, 30-60 parts of binder, 20-40 parts of filler, 1-2 parts of defoamer, 1-2 parts of surfactant, 1-2 parts of thickener, and 1 part of pigment. In the composite adhesive formulation, the binder is water-soluble phenolic resin, the filler is one or more of wollastonite, cryolite, potassium fluoroborate, and sodium fluoroborate, the defoamer is polyether-modified silicone oil, the surfactant is fatty alcohol polyoxyethylene ether, the thickener is polyvinyl alcohol, and the pigment is iron oxide black.

2. The composite abrasive cloth prepared by the method described in claim 1, characterized in that, The abrasive surfaces formed by different particle sizes and / or different types of abrasives are distributed in a longitudinal strip pattern, and the abrasive particle size and / or abrasive type in two adjacent rows of abrasive surfaces are different.

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