A non-sulfurized nitrile rubber punching pad and its preparation process and composite pad

Abstract

The invention discloses a non-sulfurized nitrile rubber punching pad, a preparation process thereof and a composite pad, belonging to the technical field of rubber pads for punching. Based on the weight of 100 weight parts of nitrile rubber, the composite pad comprises: 500phr of calcium carbonate + magnesium carbonate; 70phr of 2123 phenolic resin + 210 rosin modified phenolic resin; 3-5phr of stearic acid; 4-6phr of dibutyl ester. The invention is conducive to reducing costs, and can increase the elasticity of the punching pad without adding sulfur, improve the disadvantages of the pads made of reinforced polypropylene, modified PVC and other materials in the prior art, and eliminate the harmful gases generated in the vulcanization process, reducing environmental pollution. When the punching pad has too many knife marks and cannot be used, several unusable pads are put into the rubber mixing machine roll one by one, and the sheets are produced according to the specified size, so that the recycling can be realized. If there is a small amount of loss during use, only some new materials need to be added, and the nitrile punching pad of the invention will not drop chips and has no effect on the quality of the finished product.

Description

Technical Field

[0001] The invention relates to a rubber pad for punching, in particular to a non-sulfurized nitrile rubber punching pad and a preparation process thereof and a composite pad. Background Art

[0002] The function of the punching pad is to be placed on the bottom of the object when punching (such as semi-finished rubber soles) to prevent the blade of the tool from hitting the hard surface and being damaged. It also has the function of protecting the working surface (punching equipment table) from being cut by the tool.

[0003] The punching pads usually used for semi-finished rubber molded soles and semi-finished outsoles / waist strips of vulcanized shoes are vulcanized in a vulcanizer. Reinforced polypropylene, modified PVC, etc. have no elasticity, high cost, cannot be recycled, and have low environmental efficiency. After a period of use, the chips will fall off and mix into the semi-finished rubber products, affecting product quality. Summary of the invention

[0004] The invention aims to provide a sulfur-free nitrile rubber punching pad and its preparation process and a composite pad, which can reduce costs, increase elasticity, improve the disadvantages of pads such as reinforced polypropylene and modified PVC, and have good environmental protection.

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

[0006] The present invention provides a non-sulfurized nitrile rubber punching pad, which comprises, based on 100 parts by weight of nitrile rubber:

[0007]

[0008] The present invention provides a preparation process of a sulfur-free nitrile rubber punching pad, which comprises the following steps:

[0009] 1) The time for nitrile to wrap the roller on the rubber mixing machine is: 7 to 8 minutes;

[0010] 2) Add half of calcium carbonate, magnesium carbonate, half of 2123 phenolic resin, and 210 rosin-modified phenolic resin. The basic mixing time is: 10 to 12 minutes

[0011] 3) Add the remaining half of calcium carbonate, magnesium carbonate, the remaining half of 2123 phenolic resin, 210 rosin-modified phenolic resin, stearic acid, dibutyl ester, and mix thoroughly for about 10 to 12 minutes.

[0012] 4) The distance between the rubber mixer rollers is adjusted to 10-12 mm. The rubber material is rolled on the rubber mixer rollers until the surface is smooth and free of bubbles. The rubber material is produced into sheets according to the specified size and can be used after being left for 24 hours.

[0013] The present invention also provides a composite pad, using the above-mentioned sulfur-free nitrile rubber punching pad as the surface rubber layer of the composite pad, and the composite pad also includes a core layer with elastic buffering function.

[0014] Furthermore, the core layer includes a laminated layer and a reinforcing component, wherein the laminated layer is formed by laminating a woven fabric structure made of high-strength and high-tenacity fibers and a laminated fabric made of mixed rubber, and the reinforcing component includes a metal backing plate and covering plates arranged on both sides of the metal backing plate, and corrugated metal sheets are symmetrically arranged between the metal backing plate and the covering plates on both sides;

[0015] The corrugated metal sheet is in the shape of a sine curve, and grooves are arranged at its crests and troughs; the corrugated metal sheet is evenly arranged in a group on both sides of the metal pad, and each group of corrugated metal sheets is penetrated by a limit strip at its groove that slides relative to the metal pad and the cover plate.

[0016] Furthermore, the high-strength and high-tenacity textile fiber is nylon fiber or polyester fiber.

[0017] Furthermore, the interlayer is adhered to the outer sides of the covering plates on both sides of the metal backing plate, and the interlayer is provided with 2 to 5 layers of interlayer fabrics.

[0018] Furthermore, the surfaces of the metal backing plate and the cover plate are provided with a plurality of groups of limiting grooves.

[0019] Furthermore, a plurality of groups of limit blocks are fixedly connected to the surface of the limit strip.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The punching pad of the present invention adopts a nitrile rubber punching pad without sulfur, which has a certain elasticity and does not damage the knife or drop chips when punching the semi-finished rubber product.

[0022] (2) When the punching pad of the present invention has too many cuts and cannot be used, several unusable pads (approximately according to the rubber mixing machine's rubber loading capacity) are put into the rubber mixing machine roll one by one, and the rubber surface is smooth and free of bubbles, and the sheets are produced according to the specified size. After being parked for 24 hours, it can be used again, and can be recycled. If there is a small amount of loss during use, only a small amount of new material needs to be added, and the nitrile punching pad of the present invention will not shed chips and will not affect the quality of the finished product.

[0023] (3) The punching pad of the present invention is low-cost. In comparison, the pads made of reinforced polypropylene and modified PVC polymer materials in the prior art do not degrade and have a significant negative impact on the environment. The sulfur-free nitrile punching pad of the present invention can be recycled, making a significant contribution to green environmental protection.

[0024] (4) Secondly, the present invention combines a core layer with elastic buffering function to produce a composite pad, which has better elasticity and can absorb energy and cushion shock, which is beneficial to improving the production environment. The above-mentioned recycling process can be achieved by only peeling off the surface adhesive layer.

[0025] (5) Finally, when the limit strip of the present invention slides, it will push the limit block to slide inside the limit groove, so that the limit groove limits the limit strip and prevents the limit strip from sliding out of the surface of the corrugated metal sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the composite pad in Example 2.

[0027] Figure 2 This is a schematic diagram of the structure in which the metal pad and the cover plate cooperate with each other in Example 2.

[0028] Figure 3 This is a schematic diagram of the structure in which the corrugated metal sheet and the groove cooperate with each other in Example 2.

[0029] Figure 4 This is a schematic diagram of the structure of the cooperation between the limit groove and the limit block in Example 2.

[0030] Among them, 100, surface adhesive layer; 200, core layer; 210, interlayer layer; 220, reinforcement component; 221, metal pad; 222, cover plate; 223, corrugated metal sheet; 224, groove; 225, limit strip; 226, limit groove; 227, limit block. DETAILED DESCRIPTION

[0031] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0032] In the description of the present invention, it should be noted that the terms "inside", "outside", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0033] Example 1

[0034] The present embodiment provides a non-sulfurized nitrile rubber punching pad, which comprises, based on the weight parts per 100 weight parts of nitrile rubber:

[0035]

[0036] The present embodiment provides a preparation process of a non-sulfurized nitrile rubber punching pad, which comprises the following steps:

[0037] 1) The time for nitrile to wrap the roller on the rubber mixing machine is: 7 to 8 minutes;

[0038] 2) Add half of calcium carbonate, magnesium carbonate, half of 2123 phenolic resin, and 210 rosin-modified phenolic resin. The basic mixing time is: 10 to 12 minutes

[0039] 3) Add the remaining half of calcium carbonate, magnesium carbonate, the remaining half of 2123 phenolic resin, 210 rosin-modified phenolic resin, stearic acid, dibutyl ester, and mix thoroughly for about 10 to 12 minutes.

[0040] 4) The distance between the rubber mixer rollers is adjusted to 10-12 mm. The rubber material is rolled on the rubber mixer rollers until the surface is smooth and free of bubbles. The rubber material is produced into sheets according to the specified size and can be used after being left for 24 hours.

[0041] The hardness range of the nitrile rubber punching pad provided in this embodiment is: HA: 85~90.

[0042] The nitrile rubber punching pad in this embodiment adopts a nitrile rubber punching pad without sulfur, which has a certain elasticity and does not damage the knife or drop chips when punching the rubber semi-finished product.

[0043] In this embodiment, when the punching pad has too many cuts and cannot be used, several unusable pads (approximately according to the rubber mixing machine's rubber loading capacity) are put into the rubber mixing machine roll one by one, and the rubber surface is smooth and free of bubbles, and the sheets are produced according to the specified size. After being parked for 24 hours, it can be used again, and can be recycled. If there is a small amount of loss during use, only a small amount of new material needs to be added, and the nitrile punching pad of the present invention will not drop chips and has no effect on the quality of the finished product.

[0044] The punching pad of the present invention has low cost. In comparison, the pads made of reinforced polypropylene and modified PVC polymer materials in the prior art do not degrade and have a significant negative impact on environmental protection. The sulfur-free nitrile punching pad of the present invention can be recycled, making a significant contribution to green environmental protection.

[0045] Example 2

[0046] like Figures 1 to 3 As shown, the present invention also provides a composite pad, using the above-mentioned unsulphurized nitrile rubber punching pad as the surface rubber layer 100 of the composite pad, and the composite pad also includes a core layer 200 with elastic buffering function.

[0047] Furthermore, the core layer 200 includes a laminated layer 210 and a reinforcing component 220, wherein the laminated layer 210 is formed by laminating a woven fabric structure made of high-strength and high-tenacity fibers and a laminated fabric made of mixed rubber, and the reinforcing component 220 includes a metal backing plate 221 and covering plates 222 arranged on both sides of the metal backing plate 221, and corrugated metal sheets 223 are symmetrically arranged between the metal backing plate 221 and the covering plates 222 on both sides;

[0048] The corrugated metal sheet 223 is in the shape of a sine curve, and grooves 224 are provided at its crests and troughs; the corrugated metal sheet 223 is evenly arranged in a group on each side of the metal pad 221, and each group of corrugated metal sheets 223 is penetrated by a limit bar 225 at its groove 224 for sliding relative to the metal pad 221 and the cover plate 222. The setting of the limit bar 225 can also enable the corrugated metal sheets 223 on the metal pad 221 to slide synchronously in groups.

[0049] In this embodiment, the high-strength and high-tenacity textile fiber is nylon fiber or polyester fiber.

[0050] In this embodiment, the interlayer 210 is adhered to the outer sides of the cover plate 222 on both sides of the metal backing plate 221, and the interlayer 210 is provided with 2 to 5 layers of interlayer fabrics.

[0051] In this embodiment, multiple groups of limiting grooves 226 are formed on the surfaces of the metal backing plate 221 and the cover plate 222 .

[0052] In this embodiment, a plurality of groups of limiting blocks 227 are fixedly connected to the surface of the limiting strip 225 .

[0053] A composite pad in the present embodiment has a certain elasticity during the punching process, which can buffer the impact between the tool and the table without damaging the tool. First, it is compressed by the impact, which plays a primary buffering and energy absorption effect; secondly, the interlayer 210 in the present embodiment utilizes the overlapping structure of multiple layers of interlayer fabrics. After the surface layer 100 is compressed, the interlayer 210 is deformed and compressed, which can also play a certain buffering and energy absorption effect; finally, in the core layer 200, the corrugated metal sheet 223 is in an arched structure, which serves as a load-bearing arch. When the surface layer 100 and the interlayer 210 are compressed, they can serve as a supporting structure to provide a certain structural strength, and when punching In the later stage of the cutting process, the elastic deformation of the corrugated metal sheet 223 is utilized, and the limiting strips 225 arranged in the grooves 224 at the crests and troughs thereof slide relative to the metal pad 221 and the covering plate 222, and the friction and deformation are utilized to consume the impact energy, which is beneficial to prolonging the service life of the punching pad, and is also beneficial to reducing the impact vibration on the table surface during the punching process, thereby protecting the tool; when the limiting strip 225 slides, it will push the limiting block 227 to slide inside the limiting groove 226, so that the limiting groove 226 limits the limiting strip 225 to prevent the limiting strip 225 from sliding out of the surface of the corrugated metal sheet 223.

[0054] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A composite pad based on an unsulphurized nitrile rubber punching pad, the unsulphurized nitrile rubber punching pad being used as the surface rubber layer of the composite pad, the composite pad also comprising a core layer having an elastic buffering effect; characterized in that: The unsulphurized nitrile rubber punching pad is based on the weight parts per 100 weight parts of nitrile rubber, and comprises: Calcium carbonate + magnesium carbonate 500 phr; 2123 phenolic resin + 210 rosin modified phenolic resin 70 phr; Stearic acid 3-5 phr; Dibutyl ester 4-6 phr; The core layer includes a laminated layer and a reinforcement component, wherein the laminated layer is formed by laminating a woven cloth made of high-strength and high-tenacity fibers and a laminated cloth made of mixed rubber, and the reinforcement component includes a metal backing plate and cover plates arranged on both sides of the metal backing plate, and corrugated metal sheets are symmetrically arranged between the metal backing plate and the cover plates on both sides; The corrugated metal sheet is in the shape of a sine curve, and grooves are arranged at the crests and troughs of the corrugated metal sheet; a group of the corrugated metal sheet is evenly arranged on both sides of the metal backing plate, and each group of corrugated metal sheets is provided with a limit strip at its groove that slides relative to the metal backing plate and the cover plate; The interlayer is adhered to the outer sides of the covering plates on both sides of the metal backing plate. The surfaces of the metal backing plate and the covering plate are both provided with a plurality of groups of limiting grooves. The surface of the limiting strip is fixedly connected with a plurality of groups of limiting blocks.

2. The composite backing plate based on the unsulphurized nitrile rubber punching backing plate according to claim 1, characterized in that: The high-strength and high-tenacity fibers are nylon fibers or polyester fibers.

3. The composite backing plate based on the unsulphurized nitrile rubber punching backing plate according to claim 1, characterized in that: The interlayer is provided with 2 to 5 layers of interlayer fabrics.

4. The composite backing plate based on the unsulphurized nitrile rubber punching backing plate according to claim 1, characterized in that: The method for preparing the non-sulfurized nitrile rubber punching pad comprises the following steps: 1) The time for nitrile to wrap the roller on the rubber mixing machine is: 7 to 8 minutes; 2) Add half of calcium carbonate, magnesium carbonate, half of 2123 phenolic resin, and 210 rosin-modified phenolic resin. The basic mixing time is 10 to 12 minutes. 3) Add the remaining half of calcium carbonate, magnesium carbonate, the remaining half of 2123 phenolic resin, 210 rosin-modified phenolic resin, stearic acid, dibutyl ester, and mix thoroughly for 10 to 12 minutes; 4) The distance between the rubber mixer rollers is adjusted to 10-12 mm. The rubber material is rolled on the rubber mixer until the surface is smooth and free of bubbles. The rubber material is produced into sheets according to the specified size and can be used after being left for 24 hours.

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