Burning-resistant rubber conveyor belt and preparation method thereof

Abstract

The present invention belongs to the technical field of conveyor belts, and specifically relates to a burn-resistant rubber conveyor belt and a preparation method thereof. The burn-resistant rubber conveyor belt of the present invention comprises a core layer and a covering rubber layer arranged on both sides of the core layer, and the covering rubber layer comprises the following components by weight: 80-120 parts of styrene-butadiene rubber, 0.2-1.0 parts of vulcanizing agent, 0.5-3.0 parts of accelerator, 2-6 parts of antioxidant, 3-7 parts of zinc oxide, 1.0-2.5 parts of stearic acid, 5-15 parts of coumarone, 40-60 parts of carbon black, 5-10 parts of zinc borate, 5-10 parts of aluminum hydroxide and 5-10 parts of glass fiber. The present invention can form a dense heat-insulating layer with a certain support strength by adding glass fiber, cooperating with the carbon-forming properties of the resin and the synergistic effect of the flame retardant system, preventing the high-temperature material from further damaging the belt body, and improving the service life of the conveyor belt.

Description

Technical Field

[0001] The invention belongs to the technical field of conveyor belts and relates to a rubber conveyor belt, in particular to a burn-resistant rubber conveyor belt and a preparation method thereof. Background Art

[0002] In the metallurgy, building materials, casting, coking, chemical and other industries, conveying high-temperature solid materials such as sintered ore, coke, cement, fertilizer, etc. requires not only a conveyor belt with good heat resistance, but also a burn-resistant performance. However, the existing heat-resistant and high-temperature resistant conveyor belts do not have ideal burn-resistant performance. Most of their covering rubber layers use EPDM as the main raw material, which can generally only be used for a long time at a temperature of about 150-180°C. Once it is used to convey high-temperature materials above 180°C, its covering rubber layer will be scalded or even burned, and the heat of the high-temperature material will quickly spread inward through the damaged surface, thereby causing damage to the skeleton layer, affecting the service life of the conveyor belt. In addition, the EPDM material is expensive, and the economic benefits of the conveyor belt are poor. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a burn-resistant rubber conveyor belt and a preparation method thereof. The burn-resistant rubber conveyor belt prepared by the present invention has good economic benefits and a long service life. By adding glass fiber, the carbon-forming properties of the resin and the synergistic effect of the flame retardant system can form a dense heat-insulating layer with a certain supporting strength, prevent high-temperature materials from further damaging the belt body, and improve the service life of the conveyor belt.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the embodiment of the present invention is:

[0005] In the first aspect, an embodiment of the present invention provides a burn-resistant rubber conveyor belt, comprising a core layer and a covering rubber layer arranged on both sides of the core layer, wherein the covering rubber layer comprises the following components by weight: 80-120 parts of styrene-butadiene rubber, 0.2-1.0 parts of vulcanizer, 0.5-3.0 parts of accelerator, 2-6 parts of antioxidant, 3-7 parts of zinc oxide, 1.0-2.5 parts of stearic acid, 5-15 parts of coumarone, 40-60 parts of carbon black, 5-10 parts of zinc borate, 5-10 parts of aluminum hydroxide and 5-10 parts of glass fiber.

[0006] Furthermore, the accelerator includes two or more of accelerator NS, accelerator CZ and accelerator DTDM.

[0007] Furthermore, the vulcanizing agent is TMTD.

[0008] Furthermore, the antioxidant includes two or more of antioxidant RD, antioxidant 4020, antioxidant BLE and antioxidant MB.

[0009] Furthermore, the coumarone is 1# coumarone.

[0010] Furthermore, the styrene butadiene rubber is oil-extended styrene butadiene rubber or non-oil-extended styrene butadiene rubber.

[0011] Furthermore, the carbon black is one or more of N115, N220, N550 and white carbon black.

[0012] Furthermore, the glass fiber is a long glass fiber with a size of 10-15 mm.

[0013] In a second aspect, an embodiment of the present invention provides a method for preparing the burn-resistant rubber conveyor belt according to the first aspect, comprising the following steps:

[0014] According to the formula of the covering rubber layer, the required weight proportions of styrene-butadiene rubber, antioxidant, zinc oxide, stearic acid, coumarone, carbon black, zinc borate, aluminum hydroxide, glass fiber, accelerator and vulcanizing agent are added to an internal mixer in sequence, the mixing temperature is 70-90°C, and the mixing is carried out for 5-15 minutes to obtain a mixed rubber sheet, which is then calendered to obtain a covering rubber sheet, and the covering rubber sheet is laminated to the core layer and then vulcanized at 140-155°C and a pressure of 10-15MPa to obtain the burn-resistant conveyor belt.

[0015] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0016] The burn-resistant rubber conveyor belt of the present invention improves the carbonization effect by adding coumarone resin, forms a dense carbon layer, isolates heat transfer, and improves the service life of the product. The synergistic effect of zinc borate and aluminum hydroxide improves the carbonization effect and also has good flame retardant properties. By adding glass fiber and interspersing it in the carbonization layer, not only the heat insulation effect is significantly improved, but also a good supporting capacity is provided, thereby preventing high-temperature materials from causing greater damage to the belt body and improving the service life of the product. DETAILED DESCRIPTION

[0017] A burn-resistant rubber conveyor belt comprises a core layer and covering rubber layers arranged on both sides of the core layer. The covering rubber layers comprise the following components by weight: 80-120 parts of styrene-butadiene rubber, 0.2-1.0 parts of vulcanizer, 0.5-3.0 parts of accelerator, 2-6 parts of antioxidant, 3-7 parts of zinc oxide, 1.0-2.5 parts of stearic acid, 5-15 parts of coumarone, 40-60 parts of carbon black, 5-10 parts of zinc borate, 5-10 parts of aluminum hydroxide and 5-10 parts of glass fiber.

[0018] The promoter includes two or more of promoter NS, promoter CZ and promoter DTDM.

[0019] The curing agent was TMTD.

[0020] The antioxidant includes two or more of antioxidant RD, antioxidant 4020, antioxidant BLE and antioxidant MB.

[0021] The coumarone is 1# coumarone.

[0022] The styrene butadiene rubber is oil-extended styrene butadiene rubber or non-oil-extended styrene butadiene rubber.

[0023] The carbon black is one or more of N115, N220, N550 and white carbon black.

[0024] The glass fibers are long glass fibers with a size of 10-15 mm.

[0025] The preparation method of the above-mentioned burn-resistant rubber conveyor belt comprises the following steps: according to the formula of the covering rubber layer, the required weight proportions of styrene-butadiene rubber, antioxidant, zinc oxide, stearic acid, coumarone, carbon black, zinc borate, aluminum hydroxide, glass fiber, accelerator and vulcanizing agent are added to an internal mixer in sequence, the mixing temperature is 70-90°C, and the mixing is performed for 5-15 minutes to obtain a mixed rubber sheet, and then the mixed rubber sheet is calendered to obtain a covering film, and the covering film is laminated to the core layer and then vulcanized at 140-155°C and a pressure of 10-15MPa to obtain the above-mentioned burn-resistant conveyor belt.

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Example 1

[0028] A burn-resistant rubber conveyor belt comprises a core layer and covering rubber layers arranged on both sides of the core layer, wherein the covering rubber layers are made of the following components: 90 kg of unoiled styrene-butadiene rubber, 0.9 kg of vulcanizing agent TMTD, 1.26 kg of accelerator NS, 1.26 kg of accelerator DTDM, 0.9 kg of antioxidant RD, 1.8 kg of antioxidant 4020, 0.9 kg of antioxidant MB, 6.3 kg of zinc oxide, 1.8 kg of stearic acid, 9 kg of 1# coumarone, 45 kg of N220 carbon black, 5.4 kg of zinc borate, 5.4 kg of aluminum hydroxide and 9 kg of glass fiber (length of 10 mm).

[0029] The preparation method of the above-mentioned burn-resistant rubber conveyor belt comprises the following steps: according to the formula of the covering rubber layer, the required weight proportions of unoiled styrene-butadiene rubber, small materials (antiaging agent RD, antioxidant 4020, antioxidant MB, zinc oxide, stearic acid, 1# coumarone, N220 carbon black, zinc borate, aluminum hydroxide, glass fiber), accelerator NS, accelerator DTDM and vulcanizing agent TMTD are sequentially put into an internal mixer, the mixing temperature is 80°C, and the mixing is carried out for 6 minutes to obtain a mixed rubber sheet, and then the mixed rubber sheet is calendered to obtain a covering rubber sheet, and the covering rubber sheet is laminated to the core layer and then vulcanized at 150°C±2 and a pressure of 10MPa to obtain a burn-resistant conveyor belt.

[0030] Example 2

[0031] A burn-resistant rubber conveyor belt comprises a core layer and a covering rubber layer arranged on both sides of the core layer, wherein the covering rubber layer is made of the following components: 90 kg of unfilled styrene-butadiene rubber, 0.9 kg of vulcanizing agent TMTD, 1.26 kg of accelerator NS, 1.26 kg of accelerator DTDM, 0.9 kg of antioxidant RD, 1.8 kg of antioxidant 4020, 0.9 kg of antioxidant MB, 6.3 kg of zinc oxide, 1.8 kg of stearic acid, 9 kg of 1# coumarone, 45 kg of N220 carbon black, 5.4 kg of zinc borate, 5.4 kg of aluminum hydroxide and 4.5 kg of long glass fiber (length is 10 mm). The manufacturing process is the same as that of Example 1.

[0032] Example 3

[0033] A burn-resistant rubber conveyor belt comprises a core layer and covering rubber layers arranged on both sides of the core layer, wherein the covering rubber layers are made of the following components: 90 kg of unfilled styrene-butadiene rubber, 0.9 kg of vulcanizing agent TMTD, 1.26 kg of accelerator NS, 1.26 kg of accelerator DTDM, 0.9 kg of antioxidant RD, 1.8 kg of antioxidant 4020, 0.9 kg of antioxidant MB, 6.3 kg of zinc oxide, 1.8 kg of stearic acid, 13.5 kg of 1# coumarone, 45 kg of N220 carbon black, 5.4 kg of zinc borate, 5.4 kg of aluminum hydroxide and 4.5 kg of long glass fiber (length is 10 mm). The manufacturing process is the same as that of Example 1.

[0034] Comparative Example 1

[0035] A burn-resistant rubber conveyor belt comprises a core layer and covering rubber layers arranged on both sides of the core layer, wherein the covering rubber layers are made of the following components: 90 kg of unfilled styrene-butadiene rubber, 0.9 kg of vulcanizing agent TMTD, 1.26 kg of accelerator NS, 1.26 kg of accelerator DTDM, 0.9 kg of antioxidant RD, 1.8 kg of antioxidant 4020, 0.9 kg of antioxidant MB, 6.3 kg of zinc oxide, 1.8 kg of stearic acid, 9 kg of 1# coumarone, 45 kg of N220 carbon black, 5.4 kg of zinc borate, and 9 kg of glass fiber (length 10 mm). The manufacturing process is the same as that of Example 1.

[0036] Comparative Example 2

[0037] A burn-resistant rubber conveyor belt comprises a core layer and covering rubber layers arranged on both sides of the core layer, wherein the covering rubber layers are made of the following components: 90 kg of unfilled styrene-butadiene rubber, 0.9 kg of vulcanizing agent TMTD, 1.26 kg of accelerator NS, 1.26 kg of accelerator DTDM, 0.9 kg of antioxidant RD, 1.8 kg of antioxidant 4020, 0.9 kg of antioxidant MB, 6.3 kg of zinc oxide, 1.8 kg of stearic acid, 9 kg of 1# coumarone, 45 kg of N220 carbon black, 5.4 kg of zinc borate and 5.4 kg of aluminum hydroxide. The manufacturing process is the same as that of Example 1.

[0038] Comparative Example 3

[0039] A burn-resistant rubber conveyor belt comprises a core layer and a covering rubber layer arranged on both sides of the core layer, wherein the covering rubber layer is made of the following components: 90 kg of unfilled styrene-butadiene rubber, 0.9 kg of vulcanizing agent TMTD, 1.26 kg of accelerator NS, 1.26 kg of accelerator DTDM, 0.9 kg of antioxidant RD, 1.8 kg of antioxidant 4020, 0.9 kg of antioxidant MB, 6.3 kg of zinc oxide, 1.8 kg of stearic acid, 9 kg of 1# coumarone, 45 kg of N220 carbon black, 5.4 kg of aluminum hydroxide, and 9 kg of long glass fiber (length of 10 mm). The manufacturing process is the same as that of Example 1.

[0040] Comparative Example 4

[0041] A burn-resistant rubber conveyor belt comprises a core layer and covering rubber layers arranged on both sides of the core layer, wherein the covering rubber layers are made of the following components: 90 kg of unfilled styrene-butadiene rubber, 0.9 kg of vulcanizing agent TMTD, 1.26 kg of accelerator NS, 1.26 kg of accelerator DTDM, 0.9 kg of antioxidant RD, 1.8 kg of antioxidant 4020, 0.9 kg of antioxidant MB, 6.3 kg of zinc oxide, 1.8 kg of stearic acid, 45 kg of N220 carbon black, 5.4 kg of zinc borate, 5.4 kg of aluminum hydroxide and 9 kg of glass fiber (length 10 mm). The manufacturing process is the same as that of Example 1.

[0042] It should be noted that the core layers of the burn-resistant rubber conveyor belts of Examples 1-3 and Comparative Examples 1-4 are the same. Since the present application mainly examines the burn-resistant performance of the covering rubber, the material of the core layer is not limited.

[0043] The determination method of the present invention is in accordance with the following standards:

[0044] The conveyor belt burning resistance test method is carried out according to HG / T4732-2014 standard. The specific test method is: select an iron ball with a diameter of 30 mm, place it in a muffle furnace and fully heat it to 800°C, take it out and place it on the surface of the burning-resistant conveyor belt of Example 1-3 and Comparative Example 1-4, start timing 5mm, compare the burning depth and width, and the results are shown in Table 1.

[0045] Table 1 Comparison of the performance of the conveyor belt covering rubber layer in Examples 1-3 of the present invention and Comparative Examples 1-4

[0046]

[0047] By comparing the burning depth and burning width of Examples 1-3 and Comparative Examples 1-4 in Table 1, it can be seen that the present invention can significantly improve the burning resistance of the conveyor belt product through the synergistic effect of coumarone resin, zinc borate and alumina; further adding glass fiber can further improve the burning resistance of the conveyor belt product.

[0048] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A burn-resistant rubber conveyor belt, comprising a core layer and covering rubber layers arranged on both sides of the core layer, characterized in that: The covering rubber layer includes the following components by weight: 80-120 parts of styrene-butadiene rubber, 0.2-1.0 parts of vulcanizer, 0.5-3.0 parts of accelerator, 2-6 parts of antioxidant, 3-7 parts of zinc oxide, 1.0-2.5 parts of stearic acid, 5-15 parts of coumarone, 40-60 parts of carbon black, 5-10 parts of zinc borate, 5-10 parts of aluminum hydroxide and 5-10 parts of glass fiber.

2. The burn-resistant rubber conveyor belt according to claim 1, characterized in that: The accelerator includes two or more of accelerator NS, accelerator CZ and accelerator DTDM.

3. The burn-resistant rubber conveyor belt according to claim 1, characterized in that: The vulcanizing agent is TMTD.

4. The burn-resistant rubber conveyor belt according to claim 1, characterized in that: The antioxidant includes two or more of antioxidant RD, antioxidant 4020, antioxidant BLE and antioxidant MB.

5. The burn-resistant rubber conveyor belt according to claim 1, characterized in that: The coumarone described is 1# coumarone.

6. The burn-resistant rubber conveyor belt according to claim 1, characterized in that: The styrene butadiene rubber is oil-extended styrene butadiene rubber or non-oil-extended styrene butadiene rubber.

7. The burn-resistant rubber conveyor belt according to claim 1, characterized in that: The carbon black is one or more of N115, N220, N550 and white carbon black.

8. The burn-resistant rubber conveyor belt according to claim 1, characterized in that: The glass fiber is a long glass fiber with a length of 10-15 mm.

9. The method for preparing the burn-resistant rubber conveyor belt according to any one of claims 1 to 8, characterized in that: The following steps are involved: According to the formula of the covering rubber layer, the required weight proportions of styrene-butadiene rubber, antioxidant, zinc oxide, stearic acid, coumarone, carbon black, zinc borate, aluminum hydroxide, glass fiber, accelerator and vulcanizing agent are added to an internal mixer in sequence, the mixing temperature is 70-90°C, and the mixing is carried out for 5-15 minutes to obtain a mixed rubber sheet, which is then calendered to obtain a covering rubber sheet, and the covering rubber sheet is laminated to the core layer and then vulcanized at 140-155°C and a pressure of 10-15MPa to obtain the burn-resistant conveyor belt.

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