A polyurethane polishing wheel and a method of making the same

Abstract

The present application relates to a kind of polyurethane polishing wheels for stainless steel mirror polishing, which is made by impregnating base cloth with a composition containing polyurethane and DMF, and then removing DMF, wherein the base cloth contains, by weight percentage: 50-100% polyester fiber, 0-30% viscose fiber, and 0-30% nylon fiber; the composition containing polyurethane and DMF contains, by weight percentage: 8-50% polyurethane with an elastic modulus of 30-60, and 50-92% DMF; the weight percentage of base cloth in the polyurethane polishing wheel is 60-90%, and the weight percentage of polyurethane is 10-40%. The polyurethane polishing wheel of the present application has a greater improvement in wear resistance, stainless steel mirror flatness and cutting force compared to wool felt polishing wheel.

Description

Technical Field

[0001] This invention relates to the field of metal polishing, specifically to a polyurethane polishing wheel for fine polishing of stainless steel mirror surfaces and its preparation method. Background Technology

[0002] The stainless steel mirror polishing process mainly includes two steps: thinning and fine polishing. The thinning step mainly uses a scouring pad polishing wheel, while the fine polishing step mainly uses a wool felt polishing wheel. Currently, wool felt polishing wheels are primarily made from wool, and are formed through physical processes such as rubbing, squeezing, and felting. This results in lower structural strength and consequently, a shorter wear lifespan. The lifespan of wool felt polishing wheels is generally around 160 hours.

[0003] Furthermore, because the main raw material of wool felt polishing wheels is wool, and the coarseness of wool is approximately 28-33μm, it is impossible to achieve a standard fineness. Experimental data shows that after polishing stainless steel plates, the surface flatness difference of wool felt polishing wheels is approximately 14-18μm. Moreover, the low hardness of wool leads to low polishing efficiency. Experimental data indicates that the forward speed of stainless steel products on wool felt polishing wheels in a fine polishing production line is approximately 2 meters / min.

[0004] There is a demand for polishing products for stainless steel products that offer better wear resistance, smoothness, and cutting power. Summary of the Invention

[0005] The purpose of this invention is to provide a polyurethane polishing wheel for stainless steel mirror polishing, which significantly improves upon wool felt polishing wheels in terms of wear resistance, stainless steel mirror surface flatness, and cutting force. Under the same working conditions, wool felt polishing wheels have a wear resistance of approximately 160 hours, a stainless steel mirror surface flatness difference of approximately 14-18 μm, and a cutting force that results in a stainless steel product feed speed of approximately 2 m / min in a fine polishing production line. In contrast, the polyurethane polishing wheel of this invention has a wear resistance of at least 220 hours, a stainless steel mirror surface flatness difference of approximately 6-10 μm, and a stainless steel product feed speed of at least 2.6 m / min in a fine polishing production line.

[0006] According to one aspect of the present invention, a polyurethane polishing wheel for stainless steel mirror polishing is provided, which is made by impregnating a base fabric with a composition containing polyurethane and DMF, and then removing the DMF. The base fabric contains, by weight percentage: 50-100% polyester fiber, 0-30% viscose fiber, and 0-30% nylon fiber; the composition containing polyurethane and DMF contains, by weight percentage: 8-50% polyurethane with an elastic modulus of 30-60 and 50-92% DMF; the polyurethane polishing wheel has a base fabric weight percentage of 60-90% and a polyurethane weight percentage of 10-40%.

[0007] Preferably, the base fabric is a needle-punched nonwoven fabric.

[0008] Preferably, the thickness of the base fabric is 15-45 mm, more preferably about 20 mm.

[0009] Preferably, the base fabric is composed of 50-100% polyester fiber, 0-30% viscose fiber, and 0-30% nylon fiber by weight percentage.

[0010] Preferably, the composition containing polyurethane and DMF consists of polyurethane and DMF with an elastic modulus of 30-60.

[0011] Preferably, in the composition containing polyurethane and DMF, the weight percentage of polyurethane with an elastic modulus of 30-60 is 10-20%, and the weight percentage of DMF is 80-90%.

[0012] Preferably, the elastic modulus of the polyurethane is 55.

[0013] Preferably, polyurethane polishing wheels are used for fine polishing of stainless steel mirror surfaces.

[0014] According to another aspect of the present invention, the present invention provides a method for preparing the above-mentioned polyurethane polishing wheel, comprising the following steps:

[0015] (1) The base fabric was prepared using a needle-punched nonwoven fabric manufacturing process;

[0016] (2) Prepare a composition containing polyurethane and DMF;

[0017] (3) Impregnate the base fabric with a composition containing polyurethane and DMF;

[0018] (4) Remove DMF.

[0019] In a preferred embodiment, in step (4), the base fabric impregnated with a composition containing polyurethane and DMF is introduced into a coagulation tank, where the DMF is reduced by the mutual dissolution of water and DMF in the coagulation tank, thereby causing the polyurethane to coagulate; it is then introduced into a water washing tank to remove DMF by water washing; and the moisture is removed by heating at 110-150°C (preferably for 15-30 minutes).

[0020] In a preferred embodiment, the process further includes the following steps: using a belt sander or a sheeting machine to further process the material to the required thickness; and using a profiling machine or a stamping machine to further process it to the required shape.

[0021] According to another aspect of the invention, the present invention provides the use of the above-described polyurethane polishing wheel in stainless steel mirror polishing. Preferably, it is used in the fine polishing of stainless steel mirror surfaces.

[0022] According to another aspect of the present invention, a stainless steel mirror polishing machine is provided, which uses the above-described polyurethane polishing wheel.

[0023] According to another aspect of the present invention, the present invention provides a method for polishing stainless steel mirror surface using the above-described polyurethane polishing wheel.

[0024] The inventors have discovered that the polyurethane polishing wheel of this invention, made primarily from polyurethane and polyester fibers using a combination of needle punching and chemical cross-linking processes, exhibits improved wear resistance compared to wool felt polishing wheels. Under the same working conditions, its service life is increased from approximately 160 hours to at least 220 hours. Furthermore, compared to wool, the fineness of polyester fibers is approximately 14-16 μm, resulting in a reduction in the surface flatness difference of stainless steel from approximately 14-18 μm to 6-10 μm under the same working conditions. In particular, there is a significant improvement in cutting force; compared to wool felt polishing wheels, the hardness is increased, and the forward speed of stainless steel products in a fine polishing production line is increased from 2 meters / min to at least 2.6 meters / min. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by this invention.

[0026] Example 1

[0027] 1. Preparation of base fabric

[0028] The fabric is 100% polyester fiber by weight. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0029] 2. Formulate a composition containing polyurethane and DMF.

[0030] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 55 and 8 parts DMF as solvent, by weight.

[0031] 3. Preparation of polyurethane polishing wheel

[0032] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The fabric is then placed in a washing tank to remove excess DMF. Finally, it is heated at 130°C for 20 minutes to remove moisture. The semi-finished product is processed to a thickness of 20 mm using a belt sander. A profiling machine is then used to process the semi-finished product into a circle with a diameter of 240 mm. The base fabric comprises approximately 82% by weight, and the polyurethane comprises approximately 18% by weight.

[0033] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is 78 degrees. Its service life for stainless steel mirror polishing is approximately 240 hours, with a surface flatness difference of approximately 9 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 3 meters per minute. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 meters per minute.

[0034] Example 2

[0035] 1. Preparation of base fabric

[0036] By weight percentage, the fabric consists of 90% polyester fiber and 10% nylon fiber. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0037] 2. Formulate a composition containing polyurethane and DMF.

[0038] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 55 and 8 parts DMF as solvent, by weight.

[0039] 3. Preparation of polyurethane polishing wheel

[0040] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The product is then placed in a washing tank to remove excess DMF. Finally, it is heated at 120°C for 25 minutes to remove moisture. The semi-finished product is processed to a thickness of 20 mm using a belt sander. It is then processed into a circle with a diameter of 240 mm using a stamping machine. The weight percentage of the base fabric is approximately 82.2%, and the weight percentage of the polyurethane is approximately 17.8%.

[0041] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is approximately 77 degrees. Its service life for stainless steel mirror polishing is approximately 238 hours, with a surface flatness difference of approximately 8 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 3 meters per minute. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 meters per minute.

[0042] Example 3

[0043] 1. Preparation of base fabric

[0044] By weight percentage, the composition is 80% polyester fiber, 10% nylon fiber, and 10% viscose fiber. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0045] 2. Formulate a composition containing polyurethane and DMF.

[0046] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 55 and 8 parts DMF as solvent, by weight.

[0047] 3. Preparation of polyurethane polishing wheel

[0048] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The fabric is then placed in a washing tank to remove excess DMF. Finally, it is heated at 110°C for 28 minutes to remove moisture. The semi-finished product is processed to a thickness of 20 mm using a sheeting machine. The semi-finished product is then processed into a circle with a diameter of 240 mm using a stamping machine. The weight percentage of the base fabric is approximately 83.7%, and the weight percentage of polyurethane is approximately 16.3%.

[0049] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is approximately 78 degrees. Its service life for stainless steel mirror polishing is approximately 242 hours, with a surface flatness difference of approximately 10 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 3 meters per minute. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 meters per minute.

[0050] Example 4

[0051] 1. Preparation of base fabric

[0052] By weight percentage, the composition is 70% polyester fiber, 20% nylon fiber, and 10% viscose fiber. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0053] 2. Formulate a composition containing polyurethane and DMF.

[0054] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 55 and 8 parts DMF as solvent, by weight.

[0055] 3. Preparation of polyurethane polishing wheel

[0056] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The fabric is then placed in a washing tank to remove excess DMF. Finally, it is heated at 130°C for 20 minutes to remove moisture. The semi-finished product is processed to a thickness of 20 mm using a sheeting machine. A shaping machine is then used to process the semi-finished product into a circle with a diameter of 240 mm. The weight percentage of the base fabric is approximately 82.9%, and the weight percentage of the polyurethane is approximately 17.1%.

[0057] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is approximately 79 degrees. Its service life for stainless steel mirror polishing is approximately 258 hours, with a surface flatness difference of approximately 8 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 2.9 m / min. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 m / min.

[0058] Example 5

[0059] 1. Preparation of base fabric

[0060] By weight percentage, the composition is 60% polyester fiber, 10% nylon fiber, and 30% viscose fiber. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0061] 2. Formulate a composition containing polyurethane and DMF.

[0062] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 55 and 8 parts DMF as solvent, by weight.

[0063] 3. Preparation of polyurethane polishing wheel

[0064] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The fabric is then placed in a washing tank to remove excess DMF. Finally, it is heated at 140°C for 18 minutes to remove moisture. The semi-finished product is processed to a thickness of 20 mm using a belt sander. A profiling machine is then used to process the semi-finished product into a circle with a diameter of 240 mm. The weight percentage of the base fabric is approximately 81.1%, and the weight percentage of the polyurethane is approximately 18.9%.

[0065] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is approximately 76 degrees. Its service life for stainless steel mirror polishing is approximately 230 hours, with a surface flatness difference of approximately 7 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 3.2 m / min. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 m / min.

[0066] Example 6

[0067] 1. Preparation of base fabric

[0068] By weight percentage, the composition is 50% polyester fiber, 30% nylon fiber, and 20% viscose fiber. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0069] 2. Formulate a composition containing polyurethane and DMF.

[0070] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 55 and 8 parts DMF as solvent, by weight.

[0071] 3. Preparation of polyurethane polishing wheel

[0072] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The fabric is then placed in a washing tank to remove excess DMF. Finally, it is heated at 150°C for 16 minutes to remove moisture. The semi-finished product is then processed to a thickness of 20 mm using a sheeting machine. Finally, the semi-finished product is processed into a circle with a diameter of 240 mm using a stamping machine. The base fabric comprises approximately 80.7% by weight, and the polyurethane comprises approximately 19.3% by weight.

[0073] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is approximately 77 degrees. Its service life for stainless steel mirror polishing is approximately 232 hours, with a surface flatness difference of approximately 10 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 3.1 m / min. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 m / min.

[0074] Example 7

[0075] 1. Preparation of base fabric

[0076] The fabric is 100% polyester fiber by weight. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0077] 2. Formulate a composition containing polyurethane and DMF.

[0078] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 55 and 6 parts DMF as solvent, by weight.

[0079] 3. Preparation of polyurethane polishing wheel

[0080] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The fabric is then placed in a washing tank to remove excess DMF. Finally, it is heated at 130°C for 20 minutes to remove moisture. The semi-finished product is processed to a thickness of 20 mm using a belt sander. A profiling machine is then used to process the semi-finished product into a circle with a diameter of 240 mm. The weight percentage of the base fabric is approximately 75.3%, and the weight percentage of the polyurethane is approximately 24.7%.

[0081] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is approximately 80 degrees. Its service life for stainless steel mirror polishing is approximately 260 hours, with a surface flatness difference of approximately 9 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 3.4 m / min. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance time of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 m / min.

[0082] Example 8

[0083] 1. Preparation of base fabric

[0084] The fabric is 100% polyester fiber by weight. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0085] 2. Formulate a composition containing polyurethane and DMF.

[0086] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 55 and 4 parts DMF as solvent, by weight.

[0087] 3. Preparation of polyurethane polishing wheel

[0088] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The fabric is then placed in a washing tank to remove excess DMF. Finally, it is heated at 130°C for 20 minutes to remove moisture. The semi-finished product is processed to a thickness of 20 mm using a sheeting machine. A shaping machine is then used to process the semi-finished product into a circle with a diameter of 240 mm. The weight percentage of the base fabric is approximately 68.8%, and the weight percentage of the polyurethane is approximately 31.2%.

[0089] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is approximately 82 degrees. Its service life for stainless steel mirror polishing is approximately 280 hours, with a surface flatness difference of approximately 9 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 3.6 m / min. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance time of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 m / min.

[0090] Example 9

[0091] 1. Preparation of base fabric

[0092] The fabric is 100% polyester fiber by weight. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0093] 2. Formulate a composition containing polyurethane and DMF.

[0094] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 30 and 8 parts DMF as solvent, by weight.

[0095] 3. Preparation of polyurethane polishing wheel

[0096] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The fabric is then placed in a washing tank to remove excess DMF. Finally, it is heated at 130°C for 20 minutes to remove moisture. The semi-finished product is processed to a thickness of 20 mm using a belt sander. A profiling machine is then used to process the semi-finished product into a circle with a diameter of 240 mm. The weight percentage of the base fabric is approximately 80.9%, and the weight percentage of the polyurethane is approximately 19.1%.

[0097] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is approximately 73 degrees. Its service life for stainless steel mirror polishing is approximately 220 hours, with a surface flatness difference of approximately 6 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 2.6 m / min. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 m / min.

[0098] Example 10

[0099] 1. Preparation of base fabric

[0100] The fabric is 100% polyester fiber by weight. The base fabric is prepared using a needle-punched nonwoven fabric manufacturing process.

[0101] 2. Formulate a composition containing polyurethane and DMF.

[0102] A homogeneous composition was prepared by combining 1 part polyurethane with an elastic modulus of 30 and 6 parts DMF as solvent, by weight.

[0103] 3. Preparation of polyurethane polishing wheel

[0104] The base fabric is impregnated with a composition containing polyurethane and DMF, then placed in a coagulation tank. The DMF content is reduced by the miscibility of water and DMF in the coagulation tank, causing the polyurethane to solidify. The fabric is then placed in a washing tank to remove excess DMF. Finally, it is heated at 130°C for 20 minutes to remove moisture. The semi-finished product is processed to a thickness of 20 mm using a sheeting machine. A shaping machine is then used to process the semi-finished product into a circle with a diameter of 240 mm. The weight percentage of the base fabric is approximately 74.7%, and the weight percentage of the polyurethane is approximately 25.3%.

[0105] The Shore C hardness of the polyurethane polishing wheel, measured using the Shore hardness measurement method (compliant with national standards GB / T531, GB / T2489, GB2411), is approximately 74 degrees. Its service life for stainless steel mirror polishing is approximately 228 hours, with a surface flatness difference of approximately 6 μm. In terms of cutting force, it is reflected in a fine polishing production line speed of approximately 2.7 m / min. In contrast, the wool felt polishing wheel, under the same working conditions, has a wear resistance of approximately 160 hours, a surface flatness difference of approximately 18 μm on stainless steel mirror surfaces, and a cutting force reflected in a fine polishing production line speed of approximately 2 m / min.

[0106] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polyurethane polishing wheel for polishing stainless steel mirror surfaces, characterized in that, The product is manufactured by impregnating a base fabric with a composition containing polyurethane and DMF, followed by removal of the DMF. The base fabric comprises, by weight percentage: 50-100% polyester fiber, 0-30% viscose fiber, and 0-30% nylon fiber; the composition containing polyurethane and DMF comprises, by weight percentage: 8-50% polyurethane with an elastic modulus of 30-60 and 50-92% DMF; the polyurethane polishing wheel contains 60-90% base fabric and 10-40% polyurethane by weight; the base fabric is a needle-punched nonwoven fabric with a thickness of 15-45 mm.

2. The polyurethane polishing wheel according to claim 1, characterized in that, The thickness of the base fabric is 20 mm.

3. The polyurethane polishing wheel according to claim 1, characterized in that, The weight percentage of polyurethane with an elastic modulus of 30-60 is 10-20%, and the weight percentage of DMF is 80-90%.

4. The method for preparing a polyurethane polishing wheel according to any one of claims 1-3, comprising the following steps: (1) The base fabric was prepared using a needle-punched nonwoven fabric manufacturing process; (2) Prepare a composition containing polyurethane and DMF; (3) Impregnate the base fabric with a composition containing polyurethane and DMF; (4) Remove DMF.

5. The preparation method according to claim 4, characterized in that, In step (4), the base fabric impregnated with the composition containing polyurethane and DMF is put into a coagulation tank, where the DMF is reduced by the water in the coagulation tank and the DMF is mutually soluble, so that the polyurethane is coagulated; it is then put into a water washing tank to remove DMF by water washing; and the moisture is removed by heating at 110-150°C for 15-30 minutes.

6. The preparation method according to claim 4, characterized in that, Further steps include: using a belt sander or a sheeting machine to further process to the required thickness; using a profiling machine or a stamping machine to further process to the required shape.

7. Use of the polyurethane polishing wheel according to any one of claims 1-3 in stainless steel mirror polishing.

8. The use according to claim 7, wherein, The polyurethane polishing wheel is used for fine polishing of stainless steel mirror surfaces.

9. A stainless steel mirror polishing machine, using a polyurethane polishing wheel according to any one of claims 1-3.

10. A method for polishing stainless steel mirror surface, using a polyurethane polishing wheel according to any one of claims 1-3.