Tubular conveying belt with low-friction edge rubber and preparation method of tubular conveying belt

Abstract

The invention belongs to the technical field of tubular conveying belts, and particularly provides a tubular conveying belt with low-friction side rubber and a preparation method thereof.The tubular conveying belt with the low-friction side rubber comprises a belt body and the side rubber, and the side rubber covers the side face of the belt body; the edge rubber is prepared from the following raw materials in parts by weight: 80-120 parts of raw rubber, 3-15 parts of zinc oxide, 0.5-3 parts of stearic acid, 30-100 parts of carbon black, 1-5 parts of an anti-aging agent, 0-50 parts of operating oil, 5-100 parts of graphite, 1-20 parts of a slipping agent, 0.2-5 parts of a vulcanization accelerator, 0.5-1 part of a vulcanizing agent and 0-15 parts of tackifying resin. The tubular conveying belt with the low-friction edge rubber has the advantages of being low in friction, high in toughness and long in service life.

Description

Technical Field

[0001] The present application belongs to the technical field of tubular conveyor belts, and in particular relates to a tubular conveyor belt with low-friction edge rubber and a preparation method thereof. Background Art

[0002] Tubular conveyor belts are a specialized type of conveying system developed from troughed belt conveyors. Roller systems apply force to guide the flat conveyor belt into a circular tubular shape, enclosing the conveyed material within the tube and achieving a sealed conveying path. Tubular conveyor belts offer advantages such as sealed conveying, flexible spatial layout, and large conveying angles, meeting clean conveying requirements and are widely used in modern industries such as coal mining, metallurgy, power generation, ports, and chemicals.

[0003] Under various working conditions, whether it is a straight section or a curved section, the tubular conveyor belt must maintain a good tube shape and tight edge overlap. Therefore, it needs to meet the following basic performance requirements: 1. It needs to have appropriate lateral rigidity to avoid tube collapse or excessive resistance that prevents operation; 2. It needs to have good elasticity and longitudinal flexibility to ensure that the belt can withstand repeated and long-term severe bending and compression; 3. It needs to have properties that adapt to the material, such as wear resistance, oil resistance, and corrosion resistance.

[0004] In addition to the above basic performance, the edges of the tubular conveyor belt are subjected to strong external forces during the process of tube retraction and tube expansion. These two processes are achieved by applying strong external forces to the conveyor belt. Generally, the edges of the tubular conveyor belt will tear to varying degrees within a few months of use. Generally, after one year, the torn parts of the tubular conveyor belt will expand, exposing the belt core and the upper and lower covering rubbers due to tearing.

[0005] The main reasons for the above phenomenon are: first, the shape of the edge rubber part of the conveyor belt is rectangular, which causes the edge part of the lower covering rubber surface of the tubular conveyor belt to form a line contact with the upper covering rubber of the belt when the conveyor belt tube is folded and opened. Under the strong extrusion and shearing action, this part is very easy to be torn and damaged; second, the edge rubber used in previous tubular conveyor belts, whether it is a fabric layered tubular conveyor belt or a wire rope core tubular conveyor belt, is generally made of the same material as the upper and lower covering rubber of the conveyor belt. The upper and lower covering rubber of the conveyor belt is mainly designed to meet the needs of conveying materials. This kind of edge rubber is applicable to conveyor belts for trough conveying, but it is not applicable to tubular conveyor belts. During the process of folding and opening the tube, the tubular conveyor belt requires a smaller friction between the edge rubber and the upper covering rubber to reduce the tearing damage to the edge rubber, so a side rubber material with a smaller friction coefficient than the covering rubber is required. Summary of the Invention

[0006] In view of the above problems, in order to further improve the problem of severe edge loss of tubular conveyor belts, the present application provides a tubular conveyor belt with low-friction edge rubber and a preparation method thereof.

[0007] The present application first provides a tubular conveyor belt with low-friction edge glue, comprising a belt body and an edge glue, wherein the edge glue covers the side surface of the belt body.

[0008] Furthermore, at least a portion of the edge glue is an arc surface, the axis of the arc surface coincides with the side surface of the belt body, and the bottom of the arc surface is tangent to the lower surface of the belt body.

[0009] Furthermore, the radius of the arc surface and the thickness of the belt body satisfy the following formula:

[0010] r=d*c;

[0011] Wherein, r is the radius of the arc surface, d is the thickness of the strip, and 0.5≤c≤1.

[0012] Furthermore, the edge glue is made of the following raw materials in parts by weight: 80-120 parts of raw rubber, 3-15 parts of zinc oxide, 0.5-3 parts of stearic acid, 30-100 parts of carbon black, 1-5 parts of antioxidant, 0-50 parts of operating oil, 5-100 parts of graphite, 1-20 parts of lubricant, 0.2-5 parts of vulcanization accelerator, 0.5-1 parts of vulcanizing agent, and 0-15 parts of tackifying resin.

[0013] Furthermore, the raw rubber is one or more of natural rubber, styrene-butadiene rubber, butadiene rubber, and nitrile-butadiene rubber;

[0014] And / or, the antioxidant is antioxidant RD or antioxidant 4020.

[0015] The present application also provides a method for preparing a tubular conveyor belt with a low-friction edge rubber, comprising the following steps:

[0016] 1) mixing raw rubber, zinc oxide, stearic acid, carbon black, antioxidant, process oil, graphite, lubricant, and tackifying resin to obtain a masterbatch; and kneading the masterbatch to obtain a rubber mix;

[0017] 2) allowing the rubber mix to stand for aging, and then extruding and molding the rubber mix and allowing it to stand to obtain a rubber strip;

[0018] 3) Fix the adhesive strips on both sides of the belt body and then vulcanize it.

[0019] Furthermore, in the step 1), the banburying temperature is 100-140° C., and the banburying time is 6-8 min;

[0020] And / or, in the step 1), the mixing temperature is 80-90° C., and the mixing time is 5-20 min.

[0021] Furthermore, in the step 2), the temperature for static aging is 15-40° C., and the time is greater than 8 hours.

[0022] Furthermore, in the step 2), the extrusion temperature of the extrusion molding is 70-100°C;

[0023] And / or, in the step 2), the storage is at a temperature of 15-40° C. for 2-8 hours.

[0024] Furthermore, in the step 3), the vulcanization temperature is 140-160° C., and the vulcanization time is 10-40 minutes.

[0025] Compared with the prior art, this application has the following beneficial effects:

[0026] 1. The edge rubber portion of the tubular conveyor belt of the present application adopts an arc-shaped structural design, which changes the line contact of the tubular conveyor belt to surface contact when the tube is folded and opened, greatly reducing the squeezing and shearing effects on the rubber surface of this part, and avoiding early damage to this part.

[0027] 2. The raw materials of the edge glue of the present application use a combination of one or more rubbers such as natural rubber, styrene-butadiene rubber, butadiene rubber and acrylonitrile-butadiene rubber as the raw rubber component, which can meet the use requirements of different working conditions. In addition, different additives are added, such as lubricants and graphite. The lubricant can migrate to the surface of the rubber product to form a layer of inert film. Graphite has a flaky structure and has a good lubricating effect. The interaction between the above two materials can reduce the friction coefficient between the edge glue and the upper cover glue, and reduce the tearing phenomenon of the edge glue during the process of closing and opening the tube. The addition of carbon black mainly plays a reinforcing role, and the operating oil and tackifying resin can increase the plasticity of the rubber, adjust the hardness of the rubber, adjust the process performance, and facilitate the calendering and extrusion of the rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a tubular conveyor belt with low-friction edge rubber according to Example 3 of the present application.

[0029] Figure 2 This is a schematic structural diagram of a tubular conveyor belt with low-friction edge rubber according to Example 4 of the present application. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] After extensive experimental research, the present application provides a tubular conveyor belt with low-friction edge glue, comprising a belt body and an edge glue, wherein the edge glue covers the side surface of the belt body.

[0032] Furthermore, at least a portion of the edge glue is an arc surface, the axis of the arc surface coincides with the side surface of the belt body, and the bottom of the arc surface is tangent to the lower surface of the belt body.

[0033] Furthermore, the radius of the arc surface and the thickness of the belt body satisfy the following formula:

[0034] r=d*c;

[0035] Wherein, r is the radius of the arc surface, d is the thickness of the strip, and 0.5≤c≤1.

[0036] Furthermore, the edge glue is made of 80-120 parts of raw rubber and additives, and the edge glue is made of the following raw materials in parts by weight: 80-120 parts of raw rubber, 3-15 parts of zinc oxide, 0.5-3 parts of stearic acid, 30-100 parts of carbon black, 1-5 parts of antioxidant, 0-50 parts of operating oil, 5-100 parts of graphite, 1-20 parts of lubricant, 0.2-5 parts of vulcanization accelerator, 0.5-1 parts of vulcanizing agent, and 0-15 parts of tackifying resin.

[0037] Furthermore, the raw rubber is one or more of natural rubber, styrene-butadiene rubber, butadiene rubber, and nitrile-butadiene rubber;

[0038] And / or, the antioxidant is antioxidant RD or antioxidant 4020.

[0039] The present application also provides a method for preparing a tubular conveyor belt with a low-friction edge rubber, comprising the following steps:

[0040] 1) mixing raw rubber, zinc oxide, stearic acid, carbon black, antioxidant, process oil, graphite, lubricant, and tackifying resin to obtain a masterbatch; and kneading the masterbatch to obtain a rubber mix;

[0041] 2) allowing the rubber mix to stand for aging, and then extruding and molding the rubber mix and allowing it to stand to obtain a rubber strip;

[0042] 3) Fix the adhesive strips on both sides of the belt body and then vulcanize it.

[0043] Furthermore, in the step 1), the banburying temperature is 100-140° C., and the banburying time is 6-8 min;

[0044] And / or, in the step 1), the mixing temperature is 80-90° C., and the mixing time is 5-20 min.

[0045] In some specific embodiments, in step 1), the banburying temperature may be 100° C., 105° C., 110° C., 115° C., 120° C., 125° C., 130° C., 135° C., or 140° C. Generally, better experimental results can be achieved when the banburying temperature is 125° C. or 130° C.

[0046] In some specific embodiments, in step 1), the banburying time can be 6 min, 6.5 min, 7 min, 7.5 min, or 8 min. Generally, a banburying time of 7 min can achieve better experimental results.

[0047] In some specific embodiments, in step 1), the mixing temperature can be 80° C., 81° C., 82° C., 83° C., 84° C., 85° C., 86° C., 87° C., 88° C., 89° C., or 90° C. Generally, a mixing temperature of 90° C. can achieve better experimental results.

[0048] In some specific embodiments, in step 1), the mixing time can be 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, or 20 min. Generally, a mixing time of 15 min can achieve better experimental results.

[0049] Furthermore, in the step 2), the temperature for static aging is 15-40° C., and the time is greater than 8 hours.

[0050] Furthermore, in the step 2), the extrusion temperature of the extrusion molding is 70-100°C;

[0051] And / or, in the step 2), the storage is at a temperature of 15-40° C. for 2-8 hours.

[0052] Furthermore, in the step 3), the vulcanization temperature is 140-160° C., and the vulcanization time is 10-40 minutes.

[0053] In some specific embodiments, in step 2), the temperature for static aging can be 15-20° C., 20-25° C., 55-30° C., 30-35° C., or 35-40° C. Generally, in step 2), when the temperature for static aging is 20-25° C., better experimental results can be obtained.

[0054] In some specific embodiments, in step 2), the aging time can be 10 hours, 12 hours, 14 hours, 16 hours, 18 hours, 20 hours, 22 hours, or 24 hours. Generally, in step 2), when the aging time is 24 hours, better experimental results can be obtained.

[0055] In some specific embodiments, in step 2), the extrusion temperature can be 70° C., 75° C., 80° C., 85° C., 90° C., 95° C., or 100° C. Generally, a better experimental effect can be obtained when the extrusion temperature is 90° C.

[0056] In some embodiments, in step 2), the storage can be at 15-20°C, 20-25°C, 55-30°C, 30-35°C, or 35-40°C for 2 hours, 4 hours, 6 hours, or 8 hours. More preferably, the storage is at 20-25°C for 5 hours.

[0057] In some specific embodiments, in step 2), the vulcanization temperature may be 141° C., 142° C., 143° C., 144° C., 145° C., 146° C., 147° C., 148° C., 149° C., 150° C., 151° C., 152° C., 153° C., 154° C., 155° C., 156° C., 157° C., 158° C., 159° C., or 160° C. Typically, in step 2), better experimental results can be achieved when the vulcanization temperature is 150° C.

[0058] In some specific embodiments, in step 2), the vulcanization time can be 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, or 40 min. Generally, a vulcanization time of 30 min can achieve better experimental results.

[0059] Example 1

[0060] The tubular conveyor belt with low-friction edge rubber of this embodiment includes a belt body and an edge rubber.

[0061] The edge bead of this embodiment is made from the following raw materials by weight: 100 kg of raw rubber, 4 kg of zinc oxide, 1 kg of stearic acid, 15 kg of lubricant, 40 kg of carbon black, 20 kg of graphite, 4 kg of operating oil, 2.5 kg of antioxidant, 2.2 kg of vulcanizing agent, and 1 kg of vulcanization accelerator.

[0062] The raw rubber is a mixture of 70 kg of nitrile rubber and 30 kg of styrene-butadiene rubber. The operating oil is aromatic oil. The antioxidant is a mixture of 1.5 kg of antioxidant RD and 1 kg of antioxidant 4020. The vulcanizing agent is sulfur. The vulcanization accelerator is accelerator CZ.

[0063] The method for preparing a tubular conveyor belt with low-friction edge rubber in this embodiment includes the following steps:

[0064] 1) Weighing the raw materials according to the above weight ratio, then placing the raw rubber, zinc oxide, stearic acid, carbon black, antioxidant, process oil, graphite, lubricant, and tackifying resin in a closed rubber mixer, mixing and kneading to obtain a masterbatch, the kneading temperature is 130° C., the kneading time is 7 minutes, and the masterbatch is placed at a temperature of 20-25° C. for 2 hours; then placing the masterbatch, vulcanization accelerator, and vulcanizing agent together in a closed rubber mixer, kneading to obtain a rubber mix, the kneading temperature is 90° C., and the kneading time is 15 minutes;

[0065] 2) The mixed rubber is allowed to stand at a temperature of 20-25°C for 24 hours, and then extruded on an extruder with a die temperature (extrusion temperature) of 90°C. The extruded thickness is equal to the thickness of the strip body and the width is 2-10 mm (set according to product requirements). The strip is left at a temperature of 20-25°C for 5 hours to obtain the strip;

[0066] 3) The rubber strips are attached to both sides of the belt body. The belt body is composed of a belt core, an upper cover rubber covering the upper surface of the belt core, and a lower cover rubber covering the lower surface of the belt core. Depending on the product type (fabric core tubular conveyor belt, steel cord core tubular conveyor belt), the belt core can be a fabric belt core or a steel cord belt core.

[0067] Depending on the shape of the edge glue, the structure of the tubular conveyor belt can be as shown in Example 3, Example 4, and Example 5.

[0068] When the belt core is a fabric belt core, the edge glue machine is used to firmly adhere the above-mentioned rubber strip to the belt core on the belt blank forming machine, and then the upper cover glue and the lower cover glue are adhered and fixed to obtain the belt blank, and then it is stored at a temperature of 15-40℃ for use;

[0069] When the belt core is a steel wire rope belt core, apply adhesive to the edge of the belt core, wait for the adhesive solvent to evaporate, then stick the above adhesive strip to the belt core and fix it, then stick and fix the upper cover glue and the lower cover glue to obtain the belt blank, and then store it at a temperature of 15-40℃ for use;

[0070] The belt blanks parked for use are then vulcanized at a temperature of 150°C and a time of 30 minutes. For the belt blanks of the structure shown in Example 1, normal rectangular iron pads are used for vulcanization; for the belt blanks of the structure shown in Example 2 or 3, relatively arc-shaped iron pads are used for vulcanization.

[0071] The physical and mechanical properties of the tubular conveyor belt of this embodiment are as follows:

[0072] Tensile strength: 16.3 MPa;

[0073] 300% tensile strength: 11 MPa;

[0074] Elongation at break: 462%;

[0075] Shao Boer wear: 114mm 3 .

[0076] Example 2

[0077] The tubular conveyor belt with low-friction edge rubber of this embodiment includes a belt body and an edge rubber.

[0078] The edge glue of this embodiment is made of the following raw materials: 100 kg of raw rubber, 3 kg of zinc oxide, 1 kg of stearic acid, 5 kg of slip agent, 40 kg of carbon black, 80 kg of graphite, 3 kg of antioxidant, 1.5 kg of vulcanizing agent, 1.2 kg of vulcanization accelerator, and 5 kg of tackifying resin.

[0079] The raw rubber is styrene-butadiene rubber. The antioxidant is a mixture of 1 kg of antioxidant RD and 2 kg of antioxidant 4020. The vulcanizing agent is sulfur. The vulcanization accelerator is accelerator CZ.

[0080] The method for preparing a tubular conveyor belt with low-friction edge rubber in this embodiment includes the following steps:

[0081] 1) Weighing the raw materials according to the above weight ratio, then placing the raw rubber, zinc oxide, stearic acid, carbon black, antioxidant, graphite, slip agent, and tackifying resin in a closed rubber mixer, mixing and kneading to obtain a masterbatch, the kneading temperature is 125° C., the kneading time is 7 minutes, and the masterbatch is placed at a temperature of 20-25° C. for 2 hours; then placing the masterbatch, vulcanization accelerator, and vulcanizing agent together in a closed rubber mixer, kneading to obtain a rubber mix, the kneading temperature is 90° C., and the kneading time is 15 minutes;

[0082] 2) The mixed rubber is allowed to stand at a temperature of 20-25°C for 24 hours, and then extruded on an extruder with a die temperature (extrusion temperature) of 90°C. The extruded thickness is equal to the thickness of the strip body and the width is 2-10 mm (set according to product requirements). The strip is left at a temperature of 20-25°C for 5 hours to obtain the strip;

[0083] 3) The rubber strips are attached to both sides of the belt body. The belt body is composed of a belt core, an upper cover rubber covering the upper surface of the belt core, and a lower cover rubber covering the lower surface of the belt core. Depending on the product type (fabric core tubular conveyor belt, steel cord core tubular conveyor belt), the belt core can be a fabric belt core or a steel cord belt core.

[0084] Depending on the shape of the edge glue, the structure of the tubular conveyor belt can be as shown in Example 3, Example 4, and Example 5.

[0085] When the belt core is a fabric belt core, the edge glue machine is used to firmly adhere the above-mentioned rubber strip to the belt core on the belt blank forming machine, and then the upper cover glue and the lower cover glue are adhered and fixed to obtain the belt blank, and then it is stored at a temperature of 15-40℃ for use;

[0086] When the belt core is a steel wire rope belt core, apply adhesive to the edge of the belt core, wait for the adhesive solvent to evaporate, then stick the above adhesive strip to the belt core and fix it, then stick and fix the upper cover glue and the lower cover glue to obtain the belt blank, and then store it at a temperature of 15-40℃ for use;

[0087] The belt blanks parked for use are then vulcanized at a temperature of 150°C and a time of 30 minutes. For the belt blanks of the structure shown in Example 1, normal rectangular iron pads are used for vulcanization; for the belt blanks of the structure shown in Example 2 or 3, relatively arc-shaped iron pads are used for vulcanization.

[0088] The physical and mechanical properties of the tubular conveyor belt of this embodiment are as follows:

[0089] Tensile strength: 19.3 MPa;

[0090] 300% tensile strength: 9.3 MPa;

[0091] Elongation at break: 620%;

[0092] Shao Boer wear: 153mm 3 .

[0093] Example 3

[0094] like Figure 1 As shown, the tubular conveyor belt of this embodiment includes a belt body and an edge glue, and the edge glue is prepared according to Example 1 or Example 2.

[0095] The belt body comprises a belt core 1 , an upper covering rubber 2 and a lower covering rubber 3 . The upper covering rubber 2 covers the upper surface of the belt core 1 , and the lower covering rubber 3 covers the lower surface of the belt core 1 .

[0096] Edge glue 4 covers the side of the strip. One side of edge glue 4 is an arc-shaped surface, and the radius r of the arc surface is equal to the thickness d of the strip. The upper surface of edge glue 4 is flush with the upper surface of upper cover glue 2. The lower edge of the arc-shaped surface of edge glue 4 is tangent to the lower surface of lower cover glue 3. The center angle of the circle containing the arc surface is 90°, and the center of the circle is located at the junction of the upper surface of edge glue 4 and the upper surface of upper cover glue 2.

[0097] Example 4

[0098] like Figure 2 As shown, the tubular conveyor belt of this embodiment includes a belt body and an edge glue, and the edge glue is prepared according to Example 1 or Example 2.

[0099] The belt body comprises a belt core 1 , an upper covering rubber 2 and a lower covering rubber 3 . The upper covering rubber 2 covers the upper surface of the belt core 1 , and the lower covering rubber 3 covers the lower surface of the belt core 1 .

[0100] Edge glue 4 covers the side of the strip body. A portion of edge glue 4 is an arc-shaped surface, with a radius calculated by multiplying the strip body thickness by a coefficient of 0.5-1. The upper surface of edge glue 4 is flush with the upper surface of upper cover glue 2. The lower edge of the arc-shaped surface of edge glue 4 is tangent to the lower surface of lower cover glue 3. The center angle of the circle containing the arc-shaped surface is 90°, and the center of the circle is located at the junction of the upper surface of edge glue 4 and the upper surface of upper cover glue 2. The outermost contact portion A of edge glue 4 with the upper surface of upper cover glue 2 is a straight line and tangent to the upper edge of the arc. The width of the contact portion between the upper surface of edge glue 4 and upper cover glue 2 is equal to the arc radius.

[0101] When the edge glue structure of Example 3 is used, the resulting tubular conveyor belt minimizes squeezing and shearing between the edge and the upper cover glue during the retraction and expansion process. The arc-shaped shims used during vulcanization have the longest arc length, requiring high strength from the shim material. Other production processes can meet production requirements using existing production processes.

[0102] When the edge glue structure of Example 4 is used, the resulting tubular conveyor belt experiences increasing compression and shearing between the edge and the upper cover glue during the belt's retraction and expansion process as the edge glue's arc radius decreases. However, this still meets operational requirements. The arc length of the curved iron pads used during vulcanization gradually decreases, lowering the strength requirements for the iron pad material. Commonly used iron pad materials can meet these requirements. Other production processes can meet production requirements using existing processes.

[0103] Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present invention.

Claims

1. A tubular conveyor belt with low-friction edge rubber, characterized by: It comprises a belt body and an edge glue, wherein the edge glue covers the side surface of the belt body.

2. The tubular conveyor belt with low-friction edge rubber according to claim 1, characterized in that: At least a portion of the edge glue is an arc surface, the axis of the arc surface coincides with the side surface of the belt body, and the bottom of the arc surface is tangent to the lower surface of the belt body.

3. The tubular conveyor belt with low friction edge rubber according to claim 2, characterized in that: The radius of the arc surface and the thickness of the belt body satisfy the following formula: r=d*c; Wherein, r is the radius of the arc surface, d is the thickness of the strip, and 0.5≤c≤1.

4. The tubular conveyor belt with low-friction edge rubber according to claim 1, characterized in that: The edge glue is made of the following raw materials in parts by weight: 80-120 parts of raw rubber, 3-15 parts of zinc oxide, 0.5-3 parts of stearic acid, 30-100 parts of carbon black, 1-5 parts of antioxidant, 0-50 parts of operating oil, 5-100 parts of graphite, 1-20 parts of lubricant, 0.2-5 parts of vulcanization accelerator, 0.5-1 parts of vulcanizing agent, and 0-15 parts of tackifying resin.

5. The tubular conveyor belt with low friction edge rubber according to claim 1, characterized in that: The raw rubber is one or more of natural rubber, styrene-butadiene rubber, butadiene rubber, and nitrile rubber; And / or, the antioxidant is antioxidant RD or antioxidant 4020.

6. A method for preparing a tubular conveyor belt with low-friction edge rubber according to any one of claims 1 to 5, characterized in that: The steps include: 1) mixing raw rubber, zinc oxide, stearic acid, carbon black, antioxidant, process oil, graphite, lubricant, and tackifying resin to obtain a masterbatch; and kneading the masterbatch to obtain a rubber mix; 2) allowing the rubber mix to stand for aging, and then extruding and molding the rubber mix and allowing it to stand to obtain a rubber strip; 3) Fix the adhesive strips on both sides of the belt body and then vulcanize it.

7. The method for preparing a tubular conveyor belt with low-friction edge rubber according to claim 6, characterized in that: In the step 1), the banburying temperature is 100-140° C. and the banburying time is 6-8 min; And / or, in the step 1), the mixing temperature is 80-90° C., and the mixing time is 5-20 min.

8. The method for preparing a tubular conveyor belt with low-friction edge rubber according to claim 6, characterized in that: In the step 2), the temperature for static aging is 15-40° C. and the time is greater than 8 hours.

9. The method for preparing a tubular conveyor belt with low-friction edge rubber according to claim 6, characterized in that: In the step 2), the extrusion temperature is 70-100°C; And / or, in the step 2), the storage is at a temperature of 15-40° C. for 2-8 hours.

10. The method for preparing a tubular conveyor belt with low-friction edge rubber according to claim 6, characterized in that: In the step 3), the vulcanization temperature is 140-160° C., and the vulcanization time is 10-40 minutes.

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