A damping cloth resistant to cracks and its production process

Abstract

The present invention discloses a crack-proof damping cloth and its production process, belonging to the technical field of damping cloth, which includes a base layer, a crack-proof layer and an abrasive layer. The base layer is adhesively connected to the lower surface of the crack-proof layer through hot melt adhesive, and the abrasive layer is adhesively connected to the upper surface of the crack-proof layer through hot melt adhesive. The thickness ratio of the base layer, the crack-proof layer and the abrasive layer is 1:0.8-1.6:1. The present invention solves the problem that when the existing damping cloth is used, during long-term polishing, the damping cloth is prone to cracks, which in turn affects the polishing effect of the damping cloth and shortens the service life of the damping cloth. The crack-proof damping cloth and its production process of the present invention produce the damping cloth through the base layer, the crack-proof layer and the abrasive layer, which can improve the overall elasticity and wear resistance of the damping cloth, avoid surface cracks of the damping cloth caused by long-term use, fully guarantee the polishing effect of the damping cloth, and extend the service life of the damping cloth.

Description

Technical Field

[0001] The present invention relates to the technical field of damping cloth, and specifically to an anti-crack damping cloth and its production process. Background Art

[0002] Damping cloth is a velvety polishing material. It has a delicate texture, a soft surface, is porous and elastic, and has a long service life. During grinding, it can effectively impregnate the grinding fluid, improve the cutting force while avoiding scratching the workpiece. Damping cloth is suitable for the final polishing of optical elements, crystals, and metal and glass materials, and can also be used to polish special materials such as silicon, germanium, zinc selenide, gallium arsenide, alloy steel, ceramics, plastics (acrylic glass), etc.

[0003] When the existing damping cloth is in use, during long-term polishing, the damping cloth is prone to cracks, which in turn affects the polishing effect of the damping cloth and shortens the service life of the damping cloth. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-crack damping cloth and its production process, which can improve the overall elasticity and wear resistance of the damping cloth, avoid surface cracks of the damping cloth caused by long-term use, fully guarantee the polishing effect of the damping cloth, and extend the service life of the damping cloth, solving the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An anti-crack damping cloth includes a base layer, an anti-crack layer, and an abrasive layer. The base layer is adhesively bonded to the lower surface of the anti-crack layer through hot melt adhesive, and the abrasive layer is adhesively bonded to the upper surface of the anti-crack layer through hot melt adhesive. The thickness ratio of the base layer, the anti-crack layer, and the abrasive layer is 1:0.8 - 1.6:1. Among them, the hot melt adhesive includes the following raw materials in parts by mass: 30 - 50 parts of EVA resin, 20 - 35 parts of tackifier, 8 - 12 parts of paraffin wax, 3 - 7 parts of filler, and 1 - 3 parts of antioxidant.

[0007] Preferably, the base layer is made of polyethylene pellets and polypropylene pellets as raw materials, and is heated, melted, extruded, and spun through a single-screw melt-blown cloth extruder and a jet spinning machine to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and polypropylene fibers are woven by a knitting machine to form the base layer, where the mass ratio of polyethylene pellets to polypropylene pellets is 1:0.8 - 1.2.

[0008] Preferably, the anti-crack layer includes a flexible connection layer and elastic connectors. The lower surface of the flexible connection layer is connected to the base layer, the upper surface of the flexible connection layer is connected to the abrasive layer, elastic connectors are arranged on the flexible connection layer, the lower ends of the elastic connectors are connected to the base layer, and the upper ends of the elastic connectors are connected to the abrasive layer.

[0009] Preferably, the flexible connection layer comprises raw materials in the following parts by mass: 10-16 parts of polyurethane material and 8-12 parts of polyester material. The polyurethane material and the polyester material are heated, melted, extruded and spun by a single-screw meltblown fabric extruder and a jet spinning machine to form polyurethane fibers and polyester fibers. The polyurethane fibers and the polyester fibers are woven by a knitting machine to form the flexible connection layer.

[0010] Preferably, the elastic connecting piece is made of thermoplastic polyurethane elastomer, is melted by heating in the heating barrel of an injection molding machine, is pushed by the screw or piston of the injection molding machine, enters the mold cavity through the nozzle and the pouring system of the mold, and is hardened and shaped in the cavity to form the elastic connecting piece.

[0011] Preferably, the elastic connecting piece comprises an elastic sphere, a first elastic protrusion and a second elastic protrusion. The elastic sphere is embedded in the flexible connection layer. The first elastic protrusion is arranged at the upper end of the elastic sphere and is embedded in the abrasive layer. The second elastic protrusion is arranged at the lower end of the elastic sphere and is embedded in the base layer.

[0012] Preferably, a second connection groove for the second elastic protrusion to be inserted into is arranged on the base layer, the second elastic protrusion is matched with the second connection groove, a first connection groove for the first elastic protrusion to be inserted into is arranged on the abrasive layer, and the first elastic protrusion is matched with the first connection groove.

[0013] Preferably, the abrasive layer comprises raw materials in the following parts by mass: 50-70 parts of submicron cerium oxide, 2-5 parts of zirconia, 5-10 parts of chromium oxide, 10-15 parts of rare earth, 5-10 parts of silicon dioxide and the balance cobalt.

[0014] According to another aspect of the present invention, a production process of a crack-proof damping cloth according to the above is provided, comprising the following steps:

[0015] S1. Producing the base layer:

[0016] Polyethylene pellets and polypropylene pellets with a mass ratio of 1:0.8-1.2 are added into a single-screw meltblown fabric extruder, heated, melted and extruded by the single-screw meltblown fabric extruder, and then spun by a jet spinning machine to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and the polypropylene fibers are woven by a knitting machine to form the base layer;

[0017] S2. Producing the crack-proof layer:

[0018] The polyurethane material and the polyester material with a mass ratio of 1:0.9-1.3 are heated, melted, extruded and spun by a single-screw melt-blown cloth extruder and a jet spinneret to form polyurethane fibers and polyester fibers, which are woven by a braiding machine to form a flexible connecting layer, and the thermoplastic polyurethane elastomer is heated and melted in the heating barrel of the injection molding machine, pushed by the screw or piston of the injection molding machine, and enters the mold cavity through the nozzle and the pouring system of the mold, and hardens and shapes in the mold cavity to form an elastic connecting piece, and the elastic connecting piece is assembled on the flexible connecting layer to form an anti-cracking layer;

[0019] S3. Production of abrasive layer:

[0020] Add submicron cerium oxide, zirconium oxide, chromium oxide, rare earth, silicon dioxide and cobalt into a mixing grinder in proportion, mix and grind them thoroughly to form an abrasive layer;

[0021] S4. Production of damping cloth:

[0022] The upper end of the elastic connector is assembled in the abrasive layer, the lower end of the elastic connector is assembled in the base layer, and hot melt adhesive is set in the gap between the base layer, the anti-cracking layer and the abrasive layer, and the damping cloth is formed by compression molding using a compression molding machine.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The base layer of the present invention is bonded to the lower surface of the anti-cracking layer by hot-melt adhesive, and the abrasive layer is bonded to the upper surface of the anti-cracking layer by hot-melt adhesive. The damping cloth is produced by the base layer, the anti-cracking layer and the abrasive layer, which can improve the overall elasticity and wear resistance of the damping cloth, avoid surface cracks caused by long-term use of the damping cloth, fully guarantee the polishing effect of the damping cloth, and extend the service life of the damping cloth.

[0025] 2. The elastic sphere of the present invention is embedded in the flexible connecting layer, the first elastic protrusion arranged on the upper end of the elastic sphere is embedded in the abrasive layer, and the second elastic protrusion arranged on the lower end of the elastic sphere is embedded in the base layer, so that the base layer, the anti-cracking layer and the abrasive layer are tightly connected and have good overall flexibility. It has high elasticity and can quickly restore its original shape. During long-term use, its surface is not prone to cracks, which can fully guarantee the polishing effect of the damping cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a forward schematic diagram of the anti-crack damping cloth of the present invention;

[0027] Figure 2 A longitudinal cross-sectional view of the anti-crack damping fabric of the present invention;

[0028] Figure 3 For the present invention Figure 2 A in the enlarged view;

[0029] Figure 4 The enlarged sectional view of the second connecting groove provided on the base layer of the present invention;

[0030] Figure 5 The enlarged sectional view of the first connecting groove provided on the abrasive layer of the present invention;

[0031] Figure 6 The sectional schematic view of the elastic connecting member of the present invention.

[0032] In the figure: 1. Base layer; 11. Second connecting groove; 2. Anti-cracking layer; 21. Flexible connecting layer; 22. Elastic connecting member; 221. Elastic sphere; 222. First elastic protrusion; 223. Second elastic protrusion; 3. Abrasive layer; 31. First connecting groove. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] In order to solve the problem that when the existing damping cloth is in use, during long-term polishing, cracks are likely to appear on the damping cloth, which will affect the polishing effect of the damping cloth and shorten the service life of the damping cloth. Please refer to Figures 1-6 , the following technical solutions are provided in this embodiment:

[0035] Embodiment 1

[0036] A crack-proof damping cloth includes a base layer 1, an anti-cracking layer 2 and an abrasive layer 3. The base layer 1 is adhesively connected to the lower surface of the anti-cracking layer 2 through hot melt adhesive, and the abrasive layer 3 is adhesively connected to the upper surface of the anti-cracking layer 2 through hot melt adhesive. The thickness ratio of the base layer 1, the anti-cracking layer 2 and the abrasive layer 3 is 1:0.8 - 1.6:1. Among them, the hot melt adhesive includes the following raw materials in parts by mass: 30 - 50 parts of EVA resin, 20 - 35 parts of tackifier, 8 - 12 parts of paraffin wax, 3 - 7 parts of filler, and 1 - 3 parts of antioxidant.

[0037] It should be noted that the base layer 1 is adhesively connected to the lower surface of the anti-cracking layer 2 through hot melt adhesive, and the abrasive layer 3 is adhesively connected to the upper surface of the anti-cracking layer 2 through hot melt adhesive. By producing the damping cloth with the base layer 1, the anti-cracking layer 2 and the abrasive layer 3, the overall elasticity and wear resistance of the damping cloth can be improved, the surface cracks of the damping cloth caused by long-term use can be avoided, the polishing effect of the damping cloth can be fully guaranteed, and the service life of the damping cloth can be extended.

[0038] The base layer 1 is made of polyethylene pellets and polypropylene pellets. Through a single-screw meltblown fabric extruder and a jet spinning machine, they are heated, melted, extruded, and spun to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and polypropylene fibers are woven by a knitting machine to form the base layer 1, where the mass ratio of polyethylene pellets to polypropylene pellets is 1:0.8 - 1.2.

[0039] The crack prevention layer 2 includes a flexible connection layer 21 and elastic connectors 22. The lower surface of the flexible connection layer 21 is connected to the base layer 1, the upper surface of the flexible connection layer 21 is connected to the abrasive layer 3, elastic connectors 22 are arranged on the flexible connection layer 21, the lower ends of the elastic connectors 22 are connected inside the base layer 1, and the upper ends of the elastic connectors 22 are connected inside the abrasive layer 3.

[0040] The flexible connection layer 21 is composed of the following raw materials in parts by mass: 10 parts of polyurethane material and 8 parts of polyester material. The polyurethane material and polyester material are heated, melted, extruded, and spun through a single-screw meltblown fabric extruder and a jet spinning machine to form polyurethane fibers and polyester fibers. The polyurethane fibers and polyester fibers are woven by a knitting machine to form the flexible connection layer 21.

[0041] It should be noted that polyurethane has good stability, chemical resistance, resilience, and mechanical properties, with a small compression deformation; polyurethane fiber is an elastic fiber with excellent elasticity, characterized by high elongation at break, low modulus, and high elastic recovery rate, and good acid and alkali resistance and wear resistance. When the produced damping cloth is used repeatedly, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0042] It should be noted that polyester has high strength and elastic recovery ability; polyester fiber has characteristics such as high modulus, high strength, high elasticity, good shape retention, and abrasion resistance. When the produced damping cloth is used repeatedly, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0043] The elastic connectors 22 are made of thermoplastic polyurethane elastomer. They are heated and melted in the heating barrel of an injection molding machine, and are pushed by the screw or piston of the injection molding machine, and enter the mold cavity through the nozzle and the pouring system of the mold, and are hardened and shaped in the cavity to form the elastic connectors 22.

[0044] It should be noted that thermoplastic polyurethane elastomer has outstanding characteristics, such as excellent abrasion resistance, extremely good ozone resistance, high hardness, high strength, and good elasticity. Using thermoplastic polyurethane elastomer to produce the elastic connectors 22 can make the elastic connectors 22 flexible and highly elastic.

[0045] The elastic connecting member 22 includes an elastic sphere 221, a first elastic protrusion 222 and a second elastic protrusion 223. The elastic sphere 221 is embedded in the flexible connecting layer 21. The first elastic protrusion 222 is arranged at the upper end of the elastic sphere 221 and is embedded in the abrasive layer 3. The second elastic protrusion 223 is arranged at the lower end of the elastic sphere 221 and is embedded in the base layer 1.

[0046] A second connecting groove 11 for the second elastic protrusion 223 to snap into is arranged on the base layer 1. The second elastic protrusion 223 matches the second connecting groove 11. A first connecting groove 31 for the first elastic protrusion 222 to snap into is arranged on the abrasive layer 3. The first elastic protrusion 222 matches the first connecting groove 31.

[0047] It should be noted that the elastic sphere 221 is embedded in the flexible connecting layer 21, the first elastic protrusion 222 arranged at the upper end of the elastic sphere 221 is embedded in the abrasive layer 3, and the second elastic protrusion 223 arranged at the lower end of the elastic sphere 221 is embedded in the base layer 1, which can make the connection between the base layer 1, the crack prevention layer 2 and the abrasive layer 3 tight and the whole has good flexibility, high elasticity and can quickly restore its original shape. During long-term use, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0048] The abrasive layer 3 comprises the following raw materials in parts by mass: 50 - 70 parts of submicron cerium oxide, 2 - 5 parts of zirconia, 5 - 10 parts of chromium oxide, 10 - 15 parts of rare earth, 5 - 10 parts of silicon dioxide and the balance of cobalt.

[0049] In order to better show the production process of a crack-proof damping cloth, the present embodiment now proposes a production process of a crack-proof damping cloth according to the above, which comprises the following steps:

[0050] S1. Producing the base layer 1:

[0051] Adding polyethylene pellets and polypropylene pellets with a mass ratio of 1:0.8 - 1.2 into a single-screw meltblown cloth extruder, after heating, melting and extruding by the single-screw meltblown cloth extruder, and then performing spinning by a jet spinning machine to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and polypropylene fibers are woven by a knitting machine to form the base layer 1;

[0052] S2. Producing the crack prevention layer 2:

[0053] The polyurethane material and the polyester material with a mass ratio of 1:0.9-1.3 are heated, melted, extruded and spun by a single-screw melt-blown cloth extruder and a jet spinneret to form polyurethane fibers and polyester fibers, which are woven by a braiding machine to form a flexible connecting layer 21, and the thermoplastic polyurethane elastomer is heated and melted in the heating barrel of the injection molding machine, pushed by the screw or piston of the injection molding machine, and enters the mold cavity through the nozzle and the pouring system of the mold, and hardens and shapes in the mold cavity to form an elastic connecting piece 22, and the elastic connecting piece 22 is assembled on the flexible connecting layer 21 to form an anti-cracking layer 2;

[0054] S3, production of abrasive layer 3:

[0055] Add submicron cerium oxide, zirconium oxide, chromium oxide, rare earth, silicon dioxide and cobalt into a mixing grinder in proportion, mix and grind them thoroughly to form an abrasive layer 3;

[0056] S4. Production of damping cloth:

[0057] The upper end of the elastic connecting member 22 is assembled in the abrasive layer 3, and the lower end of the elastic connecting member 22 is assembled in the base layer 1, and hot melt adhesive is set in the gap between the base layer 1, the anti-cracking layer 2 and the abrasive layer 3, and is molded by a molding machine to form a damping cloth.

[0058] Embodiment 2

[0059] A crack-proof damping cloth comprises a base layer 1, an anti-cracking layer 2 and an abrasive layer 3, wherein the base layer 1 is adhered to the lower surface of the anti-cracking layer 2 by hot-melt adhesive, and the abrasive layer 3 is adhered to the upper surface of the anti-cracking layer 2 by hot-melt adhesive, and the thickness ratio of the base layer 1, the anti-cracking layer 2 and the abrasive layer 3 is 1:0.8-1.6:1, wherein the hot-melt adhesive comprises the following raw materials in parts by mass: 30-50 parts of EVA resin, 20-35 parts of tackifier, 8-12 parts of paraffin, 3-7 parts of filler and 1-3 parts of antioxidant.

[0060] It should be noted that the base layer 1 is bonded to the lower surface of the anti-cracking layer 2 by hot-melt adhesive, and the abrasive layer 3 is bonded to the upper surface of the anti-cracking layer 2 by hot-melt adhesive. By producing the damping cloth through the base layer 1, the anti-cracking layer 2 and the abrasive layer 3, the overall elasticity and wear resistance of the damping cloth can be improved, and surface cracks caused by long-term use of the damping cloth can be avoided. The polishing effect of the damping cloth can be fully guaranteed, and the service life of the damping cloth can be extended.

[0061] The base layer 1 is made of polyethylene pellets and polypropylene pellets as raw materials, which are heated, melted, extruded and spun by a single-screw melt-blown cloth extruder and a jet spinneret to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and polypropylene fibers are woven by a braiding machine to form the base layer 1, wherein the mass ratio of the polyethylene pellets to the polypropylene pellets is 1:0.8-1.2.

[0062] The anti-cracking layer 2 includes a flexible connection layer 21 and elastic connectors 22. The lower surface of the flexible connection layer 21 is connected to the base layer 1, and the upper surface of the flexible connection layer 21 is connected to the abrasive layer 3. Elastic connectors 22 are provided on the flexible connection layer 21. The lower ends of the elastic connectors 22 are connected to the inside of the base layer 1, and the upper ends of the elastic connectors 22 are connected to the inside of the abrasive layer 3.

[0063] The flexible connection layer 21 comprises raw materials in the following parts by mass: 10 parts of polyurethane material and 12 parts of polyester material. The polyurethane material and the polyester material are heated, melted, extruded and spun by a single-screw meltblown fabric extruder and a jet spinning machine to form polyurethane fibers and polyester fibers. The polyurethane fibers and the polyester fibers are woven by a knitting machine to form the flexible connection layer 21.

[0064] It should be noted that polyurethane has good stability, chemical resistance, resilience and mechanical properties, and has a small compression deformation; polyurethane fiber is an elastic fiber with excellent elasticity, characterized by high elongation at break, low modulus and high elastic recovery rate, and has good acid and alkali resistance and wear resistance, so that when the produced damping cloth is used repeatedly, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0065] It should be noted that polyester has high strength and elastic recovery ability; polyester fiber has characteristics such as high modulus, high strength, high elasticity, good shape retention and abrasion resistance, so that when the produced damping cloth is used repeatedly, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0066] The elastic connectors 22 are made of thermoplastic polyurethane elastomer, heated and melted in the heating barrel of an injection molding machine, and pushed by the screw or piston of the injection molding machine, and enter the mold cavity through the nozzle and the gating system of the mold, and are hardened and shaped in the cavity to form the elastic connectors 22.

[0067] It should be noted that thermoplastic polyurethane elastomer has outstanding characteristics such as excellent abrasion resistance, excellent ozone resistance, high hardness, high strength and good elasticity. Using thermoplastic polyurethane elastomer to produce the elastic connectors 22 can make the elastic connectors 22 flexible and elastic.

[0068] The elastic connectors 22 include elastic spheres 221, first elastic protrusions 222 and second elastic protrusions 223. The elastic spheres 221 are embedded in the flexible connection layer 21. The first elastic protrusions 222 are arranged at the upper ends of the elastic spheres 221 and are embedded in the abrasive layer 3. The second elastic protrusions 223 are arranged at the lower ends of the elastic spheres 221 and are embedded in the base layer 1.

[0069] A second connection groove 11 for the second elastic protrusion 223 to snap into is provided on the base layer 1, the second elastic protrusion 223 matches the second connection groove 11, a first connection groove 31 for the first elastic protrusion 222 to snap into is provided on the abrasive layer 3, and the first elastic protrusion 222 matches the first connection groove 31.

[0070] It should be noted that the elastic sphere 221 is embedded in the flexible connection layer 21, the first elastic protrusion 222 provided at the upper end of the elastic sphere 221 is embedded in the abrasive layer 3, and the second elastic protrusion 223 provided at the lower end of the elastic sphere 221 is embedded in the base layer 1, which can make the connection between the base layer 1, the crack prevention layer 2 and the abrasive layer 3 tight and the whole has good flexibility and high elasticity, and can quickly return to its original shape. During long-term use, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0071] The abrasive layer 3 comprises the following raw materials in parts by mass: 50 - 70 parts of submicron cerium oxide, 2 - 5 parts of zirconia, 5 - 10 parts of chromium oxide, 10 - 15 parts of rare earth, 5 - 10 parts of silicon dioxide and the balance of cobalt.

[0072] The damping cloth is produced by the same production process as in Example 1, and the difference from Example 1 is that the mass fraction of the polyester material in Example 2 is increased.

[0073] Example 3

[0074] A crack - proof damping cloth, comprising a base layer 1, a crack prevention layer 2 and an abrasive layer 3. The base layer 1 is adhesively connected to the lower surface of the crack prevention layer 2 by hot - melt adhesive, the abrasive layer 3 is adhesively connected to the upper surface of the crack prevention layer 2 by hot - melt adhesive, and the thickness ratio of the base layer 1, the crack prevention layer 2 and the abrasive layer 3 is 1:0.8 - 1.6:1. The hot - melt adhesive comprises the following raw materials in parts by mass: 30 - 50 parts of EVA resin, 20 - 35 parts of tackifier, 8 - 12 parts of paraffin wax, 3 - 7 parts of filler and 1 - 3 parts of antioxidant.

[0075] It should be noted that the base layer 1 is adhesively connected to the lower surface of the crack prevention layer 2 by hot - melt adhesive, and the abrasive layer 3 is adhesively connected to the upper surface of the crack prevention layer 2 by hot - melt adhesive. By producing the damping cloth with the base layer 1, the crack prevention layer 2 and the abrasive layer 3, the overall elasticity and wear resistance of the damping cloth can be improved, cracks on the surface of the damping cloth caused by long - term use can be avoided, the polishing effect of the damping cloth can be fully guaranteed, and the service life of the damping cloth can be prolonged.

[0076] The base layer 1 uses polyethylene pellets and polypropylene pellets as raw materials, is heated, melted, extruded and spun by a single - screw melt - blown cloth extruder and a jet - type spinneret to form polyethylene fibers and polypropylene fibers, and the polyethylene fibers and polypropylene fibers are woven by a knitting machine to form the base layer 1, wherein the mass fraction ratio of the polyethylene pellets to the polypropylene pellets is 1:0.8 - 1.2.

[0077] The anti-cracking layer 2 includes a flexible connection layer 21 and elastic connectors 22. The lower surface of the flexible connection layer 21 is connected to the base layer 1, and the upper surface of the flexible connection layer 21 is connected to the abrasive layer 3. Elastic connectors 22 are arranged on the flexible connection layer 21. The lower ends of the elastic connectors 22 are connected to the inside of the base layer 1, and the upper ends of the elastic connectors 22 are connected to the inside of the abrasive layer 3.

[0078] The flexible connection layer 21 comprises raw materials in the following parts by mass: 16 parts of polyurethane material and 8 parts of polyester material. The polyurethane material and the polyester material are heated, melted, extruded and spun by a single-screw meltblown fabric extruder and a jet spinning machine to form polyurethane fibers and polyester fibers. The polyurethane fibers and the polyester fibers are woven by a knitting machine to form the flexible connection layer 21.

[0079] It should be noted that polyurethane has good stability, chemical resistance, resilience and mechanical properties, and has a small compression deformation; polyurethane fiber is an elastic fiber with excellent elasticity, characterized by high elongation at break, low modulus and high elastic recovery rate, and has good acid and alkali resistance and wear resistance, so that when the produced damping cloth is used repeatedly, cracks are not likely to appear on its surface, and the polishing effect of the damping cloth can be fully guaranteed.

[0080] It should be noted that polyester has high strength and elastic recovery ability; polyester fiber has characteristics such as high modulus, high strength, high elasticity, good shape retention and abrasion resistance, so that when the produced damping cloth is used repeatedly, cracks are not likely to appear on its surface, and the polishing effect of the damping cloth can be fully guaranteed.

[0081] The elastic connectors 22 are made of thermoplastic polyurethane elastomer, heated and melted in the heating barrel of an injection molding machine, pushed by the screw or piston of the injection molding machine, and enter the mold cavity through the nozzle and the pouring system of the mold, and are hardened and shaped in the cavity to form the elastic connectors 22.

[0082] It should be noted that thermoplastic polyurethane elastomer has outstanding characteristics such as excellent abrasion resistance, excellent ozone resistance, high hardness, high strength and good elasticity. Using thermoplastic polyurethane elastomer to produce the elastic connectors 22 can make the elastic connectors 22 flexible and elastic.

[0083] The elastic connectors 22 include elastic spheres 221, first elastic protrusions 222 and second elastic protrusions 223. The elastic spheres 221 are embedded in the flexible connection layer 21. The first elastic protrusions 222 are arranged at the upper ends of the elastic spheres 221 and are embedded in the abrasive layer 3. The second elastic protrusions 223 are arranged at the lower ends of the elastic spheres 221 and are embedded in the base layer 1.

[0084] A second connection groove 11 for the second elastic protrusion 223 to snap into is provided on the base layer 1, the second elastic protrusion 223 matches the second connection groove 11, a first connection groove 31 for the first elastic protrusion 222 to snap into is provided on the abrasive layer 3, and the first elastic protrusion 222 matches the first connection groove 31.

[0085] It should be noted that the elastic sphere 221 is embedded in the flexible connection layer 21, the first elastic protrusion 222 provided at the upper end of the elastic sphere 221 is embedded in the abrasive layer 3, and the second elastic protrusion 223 provided at the lower end of the elastic sphere 221 is embedded in the base layer 1, which can make the connection between the base layer 1, the crack prevention layer 2 and the abrasive layer 3 tight and the whole flexible, with high elasticity and can quickly recover to the original shape. During long-term use, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0086] The abrasive layer 3 comprises the following raw materials in parts by mass: 50 - 70 parts of submicron cerium oxide, 2 - 5 parts of zirconia, 5 - 10 parts of chromium oxide, 10 - 15 parts of rare earth, 5 - 10 parts of silicon dioxide and the balance of cobalt.

[0087] The damping cloth is produced by the same production process as in Example 1, and the difference from Example 1 is that the mass fraction of the polyurethane material in Example 3 is increased.

[0088] Example 4

[0089] A crack - proof damping cloth, comprising a base layer 1, a crack prevention layer 2 and an abrasive layer 3. The base layer 1 is adhesively connected to the lower surface of the crack prevention layer 2 by hot - melt adhesive, the abrasive layer 3 is adhesively connected to the upper surface of the crack prevention layer 2 by hot - melt adhesive, and the thickness ratio of the base layer 1, the crack prevention layer 2 and the abrasive layer 3 is 1:0.8 - 1.6:1. The hot - melt adhesive comprises the following raw materials in parts by mass: 30 - 50 parts of EVA resin, 20 - 35 parts of tackifier, 8 - 12 parts of paraffin wax, 3 - 7 parts of filler and 1 - 3 parts of antioxidant.

[0090] It should be noted that the base layer 1 is adhesively connected to the lower surface of the crack prevention layer 2 by hot - melt adhesive, and the abrasive layer 3 is adhesively connected to the upper surface of the crack prevention layer 2 by hot - melt adhesive. By producing the damping cloth with the base layer 1, the crack prevention layer 2 and the abrasive layer 3, the overall elasticity and wear resistance of the damping cloth can be improved, cracks on the surface of the damping cloth caused by long - term use can be avoided, the polishing effect of the damping cloth can be fully guaranteed, and the service life of the damping cloth can be prolonged.

[0091] The base layer 1 uses polyethylene pellets and polypropylene pellets as raw materials, and is heated, melted, extruded and spun by a single - screw melt - blown cloth extruder and a jet - type spinneret to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and polypropylene fibers are woven by a knitting machine to form the base layer 1, where the mass ratio of the polyethylene pellets to the polypropylene pellets is 1:0.8 - 1.2.

[0092] The anti-cracking layer 2 includes a flexible connection layer 21 and elastic connectors 22. The lower surface of the flexible connection layer 21 is connected to the base layer 1, the upper surface of the flexible connection layer 21 is connected to the abrasive layer 3, elastic connectors 22 are arranged on the flexible connection layer 21, the lower ends of the elastic connectors 22 are connected within the base layer 1, and the upper ends of the elastic connectors 22 are connected within the abrasive layer 3.

[0093] The flexible connection layer 21 comprises raw materials in the following parts by mass: 16 parts of polyurethane material and 12 parts of polyester material. The polyurethane material and the polyester material are heated, melted, extruded, and spun by a single-screw meltblown fabric extruder and a jet spinning machine to form polyurethane fibers and polyester fibers, and the polyurethane fibers and the polyester fibers are woven by a knitting machine to form the flexible connection layer 21.

[0094] It should be noted that polyurethane has good stability, chemical resistance, resilience, and mechanical properties, and has a small compression deformation; polyurethane fiber is an elastic fiber with excellent elasticity, characterized by high elongation at break, low modulus, and high elastic recovery rate, and its acid and alkali resistance and wear resistance are both good, so that when the produced damping cloth is repeatedly used, cracks are not likely to appear on its surface, and the polishing effect of the damping cloth can be fully guaranteed.

[0095] It should be noted that polyester has high strength and elastic recovery ability; polyester fiber has characteristics such as high modulus, high strength, high elasticity, good shape retention, and abrasion resistance, so that when the produced damping cloth is repeatedly used, cracks are not likely to appear on its surface, and the polishing effect of the damping cloth can be fully guaranteed.

[0096] The elastic connectors 22 are made of thermoplastic polyurethane elastomer, are melted by heat in the heating barrel of an injection molding machine, are pushed by the screw or piston of the injection molding machine, enter the mold cavity through the nozzle and the pouring system of the mold, and are hardened and shaped in the cavity to form the elastic connectors 22.

[0097] It should be noted that thermoplastic polyurethane elastomer has outstanding characteristics, such as excellent abrasion resistance, extremely good ozone resistance, high hardness, high strength, and good elasticity. Using thermoplastic polyurethane elastomer to produce the elastic connectors 22 can make the elastic connectors 22 have good flexibility and large elasticity.

[0098] The elastic connectors 22 include elastic spheres 221, first elastic protrusions 222, and second elastic protrusions 223. The elastic spheres 221 are embedded in the flexible connection layer 21, the first elastic protrusions 222 are arranged at the upper ends of the elastic spheres 221 and are embedded in the abrasive layer 3, the second elastic protrusions 223 are arranged at the lower ends of the elastic spheres 221 and are embedded in the base layer 1.

[0099] A second connection groove 11 for the second elastic protrusion 223 to snap into is provided on the base layer 1, the second elastic protrusion 223 matches the second connection groove 11, a first connection groove 31 for the first elastic protrusion 222 to snap into is provided on the abrasive layer 3, and the first elastic protrusion 222 matches the first connection groove 31.

[0100] It should be noted that the elastic sphere 221 is embedded in the flexible connection layer 21, the first elastic protrusion 222 provided at the upper end of the elastic sphere 221 is embedded in the abrasive layer 3, and the second elastic protrusion 223 provided at the lower end of the elastic sphere 221 is embedded in the base layer 1, which can make the connection between the base layer 1, the crack prevention layer 2 and the abrasive layer 3 tight and the overall flexibility good, with high elasticity and can quickly return to the original shape. During long-term use, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0101] The abrasive layer 3 comprises the following raw materials in parts by mass: 50 - 70 parts of submicron cerium oxide, 2 - 5 parts of zirconia, 5 - 10 parts of chromium oxide, 10 - 15 parts of rare earth, 5 - 10 parts of silicon dioxide and the balance of cobalt.

[0102] The damping cloth is produced by the same production process as in Example 1, and the difference from Example 1 is that the mass parts of the polyurethane material and the polyester material are increased in Example 4.

[0103] Comparative Example 1

[0104] A crack - resistant damping cloth, comprising a base layer 1, a crack prevention layer 2 and an abrasive layer 3. The base layer 1 is adhesively bonded to the lower surface of the crack prevention layer 2 by hot - melt adhesive, and the abrasive layer 3 is adhesively bonded to the upper surface of the crack prevention layer 2 by hot - melt adhesive. The thickness ratio of the base layer 1, the crack prevention layer 2 and the abrasive layer 3 is 1:0.8 - 1.6:1. Among them, the hot - melt adhesive comprises the following raw materials in parts by mass: 30 - 50 parts of EVA resin, 20 - 35 parts of tackifier, 8 - 12 parts of paraffin, 3 - 7 parts of filler and 1 - 3 parts of antioxidant.

[0105] It should be noted that the base layer 1 is adhesively bonded to the lower surface of the crack prevention layer 2 by hot - melt adhesive, and the abrasive layer 3 is adhesively bonded to the upper surface of the crack prevention layer 2 by hot - melt adhesive. By producing the damping cloth with the base layer 1, the crack prevention layer 2 and the abrasive layer 3, the overall elasticity and wear resistance of the damping cloth can be improved, the surface cracks of the damping cloth caused by long - term use can be avoided, the polishing effect of the damping cloth can be fully guaranteed, and the service life of the damping cloth can be prolonged.

[0106] The base layer 1 uses polyethylene pellets and polypropylene pellets as raw materials, and is heated, melted, extruded and spun by a single - screw melt - blown cloth extruder and a jet - type spinneret to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and polypropylene fibers are woven by a knitting machine to form the base layer 1, where the mass ratio of the polyethylene pellets to the polypropylene pellets is 1:0.8 - 1.2.

[0107] The crack prevention layer 2 includes a flexible connection layer 21. The lower surface of the flexible connection layer 21 is connected to the base layer 1, and the upper surface of the flexible connection layer 21 is connected to the abrasive layer 3.

[0108] The flexible connection layer 21 includes raw materials in the following parts by mass: 10 parts of polyurethane material and 8 parts of polyester material. The polyurethane material and the polyester material are heated, melted, extruded, and spun by a single-screw meltblown fabric extruder and a jet spinning machine to form polyurethane fibers and polyester fibers. The polyurethane fibers and the polyester fibers are woven by a knitting machine to form the flexible connection layer 21.

[0109] It should be noted that polyurethane has good stability, chemical resistance, resilience, and mechanical properties, and has a small compression deformation; polyurethane fiber is an elastic fiber with excellent elasticity, characterized by high elongation at break, low modulus, and high elastic recovery rate. Its acid and alkali resistance and wear resistance are both good, so that when the produced damping cloth is used repeatedly, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0110] It should be noted that polyester has high strength and elastic recovery ability; polyester fiber has characteristics such as high modulus, high strength, high elasticity, good shape retention, and abrasion resistance, so that when the produced damping cloth is used repeatedly, cracks are not likely to appear on its surface, which can fully guarantee the polishing effect of the damping cloth.

[0111] The abrasive layer 3 includes raw materials in the following parts by mass: 50 - 70 parts of submicron cerium oxide, 2 - 5 parts of zirconia, 5 - 10 parts of chromium oxide, 10 - 15 parts of rare earth, 5 - 10 parts of silicon dioxide, and the balance of cobalt.

[0112] Compared with the first embodiment, in the first comparative example, the structure of the elastic connector 22 is cancelled. The damping cloth is produced by the same production process as in the first embodiment in the production process, and at the same time, the preparation step of the elastic connector 22 is cancelled accordingly.

[0113] Comparative Example Two

[0114] A crack-resistant damping cloth includes a base layer 1 and an abrasive layer 3. The base layer 1 is adhered to the abrasive layer 3 by hot melt adhesive. The thickness ratio of the base layer 1 to the abrasive layer 3 is 1:1. Among them, the hot melt adhesive includes raw materials in the following parts by mass: 30 - 50 parts of EVA resin, 20 - 35 parts of tackifier, 8 - 12 parts of paraffin, 3 - 7 parts of filler, and 1 - 3 parts of antioxidant.

[0115] The base layer 1 is made of polyethylene pellets and polypropylene pellets. Through a single-screw meltblown fabric extruder and a jet spinning machine, they are heated, melted, extruded, and spun to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and polypropylene fibers are woven by a knitting machine to form the base layer 1, where the mass ratio of polyethylene pellets to polypropylene pellets is 1:0.8 - 1.2.

[0116] The abrasive layer 3 comprises raw materials in the following mass parts: 50 - 70 parts of submicron cerium oxide, 2 - 5 parts of zirconia, 5 - 10 parts of chromium oxide, 10 - 15 parts of rare earth, 5 - 10 parts of silicon dioxide, and the balance cobalt.

[0117] Compared with Example 1, in Comparative Example 2, the crack prevention layer 2 structure is cancelled. The damping cloth is produced using the same production process as in Example 1 in the production process, and at the same time, the preparation steps of the crack prevention layer 2 are cancelled accordingly.

[0118] The damping cloths prepared in Examples 1 - 4 and Comparative Examples 1 - 2 are subjected to performance tests, and the performance test results of the damping cloths are shown in Table 1:

[0119] Table 1: Performance Test Results of Damping Cloth

[0120]

[0121] As can be seen from the above table, the damping cloths prepared in Examples 1 to 4 all have good elasticity and crack prevention performance.

[0122] Among them, compared with Example 1, in Example 2, both its elasticity and crack prevention performance are improved, indicating that increasing the mass parts of the polyester material can improve the elasticity and crack prevention performance of the damping cloth;

[0123] Among them, compared with Example 1, in Example 3, both its elasticity and crack prevention performance are improved, indicating that increasing the mass parts of the polyurethane material can improve the elasticity and crack prevention performance of the damping cloth;

[0124] Among them, compared with Example 1, in Example 4, both its elasticity and crack prevention performance are improved, indicating that increasing the mass parts of the polyurethane material and the polyester material can improve the elasticity and crack prevention performance of the damping cloth;

[0125] Among them, compared with Example 1, in Comparative Example 1, both its elasticity and crack prevention performance are reduced. Since the elastic connector 22 is not added in Comparative Example 1, the elasticity and crack prevention performance of the damping cloth are both reduced, indicating that the elastic connector 22 can improve the elasticity and crack prevention performance of the damping cloth;

[0126] Among them, compared with Example 1, in Comparative Example 2, both its elasticity and crack prevention performance are reduced. Since the crack prevention layer 2 is not added in Comparative Example 2, the elasticity and crack prevention performance of the damping cloth are both reduced, indicating that the crack prevention layer 2 can improve the elasticity and crack prevention performance of the damping cloth.

[0127] In summary, for the anti-crack damping cloth and its production process of the present invention, the base layer 1 is adhesively bonded to the lower surface of the anti-crack layer 2 through hot melt adhesive, and the abrasive layer 3 is adhesively bonded to the upper surface of the anti-crack layer 2 through hot melt adhesive. The damping cloth is produced by the base layer 1, the anti-crack layer 2 and the abrasive layer 3, which can improve the overall elasticity and wear resistance of the damping cloth, avoid surface cracks of the damping cloth caused by long-term use, fully ensure the polishing effect of the damping cloth, and extend the service life of the damping cloth.

[0128] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0129] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crack-proof damping cloth, comprising a base layer (1), a crack-proof layer (2) and an abrasive layer (3), characterized in that: The base layer (1) is adhered to the lower surface of the crack prevention layer (2) by hot melt adhesive. The abrasive layer (3) is adhered to the upper surface of the crack prevention layer (2). The thickness ratio of the base layer (1), the crack prevention layer (2) and the abrasive layer (3) is 1:0.8 - 1.6:

1. The hot melt adhesive includes the following raw materials in parts by mass: 30 - 50 parts of EVA resin, 20 - 35 parts of tackifier, 8 - 12 parts of paraffin, 3 - 7 parts of filler, and 1 - 3 parts of antioxidant; The crack prevention layer (2) includes a flexible connection layer (21) and elastic connectors (22). The lower surface of the flexible connection layer (21) is connected to the base layer (1), and the upper surface of the flexible connection layer (21) is connected to the abrasive layer (3). Elastic connectors (22) are arranged on the flexible connection layer (21). The elastic connectors (22) include elastic spheres (221), first elastic protrusions (222) and second elastic protrusions (223). The elastic spheres (221) are embedded in the flexible connection layer (21). The upper end of the elastic sphere (221) is provided with a first elastic protrusion (222), and the first elastic protrusion (222) is embedded in the abrasive layer (3). The lower end of the elastic sphere (221) is provided with a second elastic protrusion (223), and the second elastic protrusion (223) is embedded in the base layer (1).

2. The damping cloth for preventing cracks according to claim 1, wherein: The base layer (1) uses polyethylene pellets and polypropylene pellets as raw materials, and is heated, melted, extruded and spun by a single-screw meltblown cloth extruder and a jet spinning machine to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and polypropylene fibers are woven by a knitting machine to form the base layer (1), where the mass ratio of polyethylene pellets to polypropylene pellets is 1:0.8 - 1.

2.

3. A crack-proof damping cloth according to claim 2, characterized in that: The flexible connection layer (21) includes the following raw materials in parts by mass: 10 - 16 parts of polyurethane material and 8 - 12 parts of polyester material. The polyurethane material and the polyester material are heated, melted, extruded and spun by a single-screw meltblown cloth extruder and a jet spinning machine to form polyurethane fibers and polyester fibers. The polyurethane fibers and polyester fibers are woven by a knitting machine to form the flexible connection layer (21).

4. The damping cloth for preventing cracks according to claim 3, characterized in that: The elastic connector (22) uses thermoplastic polyurethane elastomer as the raw material, is heated and melted in the heating barrel of an injection molding machine, and is pushed by the screw or piston of the injection molding machine, enters the mold cavity through the nozzle and the pouring system of the mold, and hardens and shapes in the cavity to form the elastic connector (22).

5. The damping cloth for preventing cracks according to claim 4, characterized in that: A second connection groove (11) for the second elastic protrusion (223) to be inserted into is provided on the base layer (1). The second elastic protrusion (223) matches the second connection groove (11). A first connection groove (31) for the first elastic protrusion (222) to be inserted into is provided on the abrasive layer (3). The first elastic protrusion (222) matches the first connection groove (31).

6. The damping cloth for preventing cracks according to claim 5, characterized in that: The abrasive layer (3) includes the following raw materials in parts by mass: 50 - 70 parts of submicron cerium oxide, 2 - 5 parts of zirconia, 5 - 10 parts of chromium oxide, 10 - 15 parts of rare earth, 5 - 10 parts of silicon dioxide, and the balance cobalt.

7. A production process of a crack-resistant damping cloth according to claim 6, characterized in that: Including the following steps: S1. Production of the base layer (1): Polyethylene pellets and polypropylene pellets with a mass ratio of 1:0.8 - 1.2 are added into a single-screw meltblown fabric extruder. After being heated, melted, and extruded by the single-screw meltblown fabric extruder, they are then spun by a jet spinner to form polyethylene fibers and polypropylene fibers. The polyethylene fibers and polypropylene fibers are woven by a knitting machine to form the base layer (1); S2. Production of the anti-cracking layer (2): Polyurethane material and polyester material with a mass ratio of 1:0.9 - 1.3 are heated, melted, extruded, and spun by a single-screw meltblown fabric extruder and a jet spinner to form polyurethane fibers and polyester fibers. The polyurethane fibers and polyester fibers are woven by a knitting machine to form the flexible connection layer (21). And the thermoplastic polyurethane elastomer is heated and melted in the heating barrel of an injection molding machine, and is pushed by the screw or piston of the injection molding machine, enters the mold cavity through the nozzle and the pouring system of the mold, and hardens and sets in the cavity to form the elastic connector (22). The elastic connector (22) is assembled on the flexible connection layer (21) to form the anti-cracking layer (2); S3. Production of the abrasive layer (3): Sub-micron cerium oxide, zirconium oxide, chromium oxide, rare earth, silicon dioxide, and cobalt are added to a mixing and grinding machine in proportion and fully mixed and ground to form the abrasive layer (3); S4. Production of the damping cloth: The upper end of the elastic connector (22) is assembled in the abrasive layer (3), and the lower end of the elastic connector (22) is assembled in the base layer (1). And hot melt adhesive is set at the gap between the base layer (1), the anti-cracking layer (2), and the abrasive layer (3), and is molded by a molding press to form the damping cloth.

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