A high temperature resistant conveyor belt and preparation method thereof

Abstract

The invention relates to the technical field of rubber conveyor belts, and proposes a high-temperature resistant conveyor belt and a preparation method thereof. The high-temperature resistant conveyor belt comprises a skeleton layer and a rubber coating layer; the rubber coating layer comprises the following components in parts by weight: 40-60 parts of styrene-butadiene rubber, 10-20 parts of EPDM rubber, 15-20 parts of chloroprene rubber, 15-25 parts of ceramic fiber, 5-15 parts of aromatic sulfone fiber, 2-4 parts of vulcanizing agent, 1-2 parts of accelerator, 1-2 parts of zinc oxide, 0.5-1 parts of stearic acid, 5-10 parts of white carbon black, and 1-2 parts of antioxidant; the skeleton layer is nylon canvas; the rubber coating layer and the skeleton layer are bonded by phenolic resin. Through the above technical scheme, the problem of poor heat resistance of styrene-butadiene rubber conveyor belts in the prior art is solved.

Description

Technical Field

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

[0002] The development of conveyor belts is rapid, because it can make transportation production continuous and efficient, which is of great significance in terms of technical and economic benefits. Compared with other forms of transportation, rubber conveying has the advantages of safe operation, simple use, convenient maintenance, saving manpower and material resources, and low freight. Therefore, it has gradually been widely used in industry, agriculture, transportation and other fields.

[0003] High-heat-resistant conveyor belts are made of multiple layers of rubber cotton canvas (polyester cotton cloth) or polyester canvas covered with high-temperature flame-retardant rubber, bonded together by high-temperature vulcanization. High-temperature flame-retardant conveyor belts are widely used in high-temperature working environments such as metallurgy, coking, and building materials. They mainly transport high-temperature solid materials such as hot coke, cement, slag, hot castings, sintered ore, etc. below 175°C. Due to insufficient cooling, the material temperature can instantly reach 400°C~600°C. Therefore, in order to ensure normal operation and transportation, the conveyor belt must have good high-temperature resistance.

[0004] Styrene-butadiene rubber (SBR) is a copolymer of styrene and butadiene, and is one of the most widely used synthetic rubbers. It is mainly used in the tire industry, auto parts, hoses, tapes, rubber shoes, papermaking, and construction industries. Among them, the tire industry uses the most styrene-butadiene rubber. However, when styrene-butadiene rubber is directly used as a cover rubber for conveyor belts, its heat resistance often fails to meet the requirements of high-temperature transportation, and the physical and mechanical properties of the cover rubber decrease quickly, and aging occurs, which seriously affects the service life of the cover rubber and the conveyor belt. Summary of the invention

[0005] The invention provides a high temperature resistant conveyor belt and a preparation method thereof, which solves the problem of poor heat resistance of styrene butadiene rubber conveyor belts in the related art.

[0006] The technical solution of the present invention is as follows:

[0007] The invention provides a high-temperature resistant conveyor belt, which comprises a skeleton layer and a rubber coating layer; the rubber coating layer comprises the following components in parts by weight: 40-60 parts of styrene-butadiene rubber, 10-20 parts of ethylene-propylene-diene rubber, 15-20 parts of chloroprene rubber, 15-20 parts of ceramic fiber, 5-15 parts of aromatic sulfone fiber, 2-4 parts of vulcanizing agent, 1-2 parts of accelerator, 1-2 parts of zinc oxide, 0.5-1 parts of stearic acid, 5-10 parts of white carbon black, 2-4 parts of emulsifier, and 1-2 parts of antioxidant; the skeleton layer is nylon canvas; the rubber coating layer and the skeleton layer are bonded by using phenolic resin.

[0008] As a further technical solution, the mass ratio of the ceramic fiber to the aromatic sulfone fiber is 2:1 to 4:1.

[0009] As a further technical solution, the white carbon black is loaded on the surface of the ceramic fiber and the aromatic sulfone fiber.

[0010] As a further technical solution, the preparation method of the white carbon black loaded on the surface of the ceramic fiber and the aromatic sulfone fiber comprises the following steps:

[0011] S1, ultrasonically dispersing white carbon black in a silane coupling agent solution, and drying to obtain modified white carbon black;

[0012] S2, dispersing the ceramic fiber and the aromatic sulfone fiber in a dilute hydrochloric acid solution, stirring, and washing with water until neutral, to obtain modified ceramic fiber and aromatic sulfone fiber;

[0013] S3, adding the modified silica, the modified ceramic fiber and aramid fiber, and an emulsifier into water for reaction, washing, and drying to obtain ceramic fiber and aramid fiber with silica loaded on the surface.

[0014] As a further technical solution, the ultrasonic dispersion time in S1 is 1-2 hours; the stirring time in S2 is 40-60 minutes; the mixing time in S3 is 4-6 hours, and the temperature is 80-90°C.

[0015] As a further technical solution, the volume fraction of the silane coupling agent solution is 0.1%~2%; the volume fraction of the dilute hydrochloric acid solution is 0.1~0.5%; the mass of the emulsifier is 0.5 times the mass of white carbon black; the mass of the silane coupling agent is 0.2 times the mass of white carbon black.

[0016] As a further technical solution, the length of the ceramic fiber is 1-2 mm; the length of the aromatic sulfone fiber is 3-4 mm.

[0017] As a further technical solution, the ceramic fiber is one or more of aluminum silicate fiber, alumina fiber and silicon carbide fiber; the vulcanizing agent is sulfur; the accelerator is one of accelerator CZ, accelerator TMTD and accelerator DM; the emulsifier is one of Tween 80 and Span 80; the antioxidant is one of antioxidant 1010, antioxidant 4020 and antioxidant 4010.

[0018] As a further technical solution, a method for preparing a high temperature resistant conveyor belt comprises the following steps:

[0019] A1, mixing styrene-butadiene rubber, EPDM rubber and chloroprene rubber, adding stearic acid, zinc oxide, accelerator, antioxidant, ceramic fiber, aromatic sulfone fiber and white carbon black in sequence, and finally adding sulfur, producing a sheet to obtain a mixed rubber;

[0020] A2, the skeleton layer is immersed in a phenolic resin adhesive to obtain an impregnated skeleton layer;

[0021] A3. The mixed rubber is laminated on the upper and lower surfaces of the impregnated skeleton layer, and after vulcanization, a high temperature resistant conveyor belt is obtained.

[0022] As a further technical solution, the mixing temperature in A1 is 70-90°C; the calendering temperature in A3 is 85-95°C, and the vulcanization temperature is 150-160°C.

[0023] The working principle and beneficial effects of the present invention are:

[0024] 1. In the present invention, styrene-butadiene rubber is used as a matrix, EPDM rubber and chloroprene rubber are matched, and ceramic fiber and aromatic sulfone fiber are added to synergistically improve the high temperature resistance and wear resistance of the conveyor belt. After matching with other components and bonding with nylon canvas, the obtained conveyor belt not only has excellent high temperature resistance, but also has good wear resistance.

[0025] 2. In the present invention, by length grading of ceramic fiber and aramid fiber, and loading white carbon black on the surface of ceramic fiber and aramid fiber, white carbon black fills and covers the surface of fiber and is added to the rubber matrix, thereby further improving the high temperature resistance of the high temperature resistant conveyor belt. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the following examples and comparative examples, the silane coupling agent model is KH550, Shandong Qiyun Chemical Technology Co., Ltd.; aluminum silicate fiber, aluminum oxide fiber, and silicon carbide fiber are all purchased from Forsman Technology (Beijing) Co., Ltd.; aromatic sulfone fiber is purchased from Shanghai Teanlun Fiber Co., Ltd.; white carbon black 300 mesh is purchased from Jinan Delan Chemical Co., Ltd.; stearic acid and zinc oxide are both purchased from Merck Chemical Co., Ltd.; the phenolic resin adhesive model is KBM573, purchased from Guangzhou Soman Trading Co., Ltd.

[0028] Example 1

[0029] A rubber coating layer of a high temperature resistant conveyor belt comprises the following components in parts by weight: 40 parts of styrene-butadiene rubber, 20 parts of EPDM rubber, 15 parts of chloroprene rubber, 15 parts of aluminum silicate fiber with a length of 1 mm, 7.5 parts of aromatic sulfone fiber with a length of 2 mm, 2 parts of sulfur, 1 part of accelerator CZ, 1 part of zinc oxide, 0.5 parts of stearic acid, 5 parts of white carbon black, and 1 part of antioxidant 1010;

[0030] The preparation method of the high temperature resistant conveyor belt comprises the following steps:

[0031] A1. At 70°C, styrene-butadiene rubber, EPDM rubber and chloroprene rubber are mixed, and stearic acid, zinc oxide, accelerator CZ, antioxidant 1010, aluminum silicate fiber, aromatic sulfone fiber and white carbon black are added in sequence for mixing, and finally sulfur is added to produce sheets to obtain a mixed rubber;

[0032] A2, the skeleton layer is immersed in a phenolic resin adhesive to obtain an impregnated skeleton layer;

[0033] A3. At 85°C, the mixed rubber is calendered and laminated on the upper and lower impregnated skeleton layers, and after vulcanization at 150°C, a high temperature resistant conveyor belt (total thickness 9mm) is obtained.

[0034] Example 2

[0035] A rubber coating layer of a high temperature resistant conveyor belt comprises the following components in parts by weight: 50 parts of styrene-butadiene rubber, 15 parts of EPDM rubber, 17 parts of chloroprene rubber, 20 parts of alumina fiber with a length of 2 mm, 10 parts of aromatic sulfone fiber with a length of 5 mm, 3 parts of sulfur, 1.5 parts of accelerator TMTD, 1.5 parts of zinc oxide, 0.7 parts of stearic acid, 7 parts of white carbon black, and 1.5 parts of antioxidant 4020;

[0036] The preparation method of the high temperature resistant conveyor belt comprises the following steps:

[0037] A1. At 80°C, styrene-butadiene rubber, EPDM rubber and chloroprene rubber are mixed, and stearic acid, zinc oxide, accelerator TMTD, antioxidant 4020, alumina fiber, aromatic sulfone fiber and white carbon black are added in sequence for mixing, and finally sulfur is added to produce sheets to obtain a mixed rubber;

[0038] A2, the skeleton layer is immersed in a phenolic resin adhesive to obtain an impregnated skeleton layer;

[0039] A3. At 90°C, the mixed rubber is laminated on the upper and lower layers of the impregnated skeleton layer, and after vulcanization at 155°C, a high temperature resistant conveyor belt (total thickness 9mm) is obtained.

[0040] Example 3

[0041] A rubber coating layer of a high temperature resistant conveyor belt comprises the following components in parts by weight: 60 parts of styrene-butadiene rubber, 10 parts of EPDM rubber, 20 parts of chloroprene rubber, 20 parts of silicon carbide fiber with a length of 1 mm, 10 parts of aromatic sulfone fiber with a length of 2 mm, 4 parts of sulfur, 2 parts of accelerator DM, 2 parts of zinc oxide, 1 part of stearic acid, 10 parts of white carbon black, and 2 parts of antioxidant 4010;

[0042] The preparation method of the high temperature resistant conveyor belt comprises the following steps:

[0043] A1. At 90°C, styrene-butadiene rubber, EPDM rubber and chloroprene rubber are mixed, and stearic acid, zinc oxide, accelerator DM, antioxidant 4010, silicon carbide fiber, aromatic sulfone fiber and white carbon black are added in sequence for mixing, and finally sulfur is added to produce sheets to obtain a mixed rubber;

[0044] A2, the skeleton layer is immersed in a phenolic resin adhesive to obtain an impregnated skeleton layer;

[0045] A3. At 95°C, the mixed rubber is laminated on the upper and lower layers of the impregnated skeleton layer, and after vulcanization at 160°C, a high temperature resistant conveyor belt (total thickness 9mm) is obtained.

[0046] Example 4

[0047] The only difference between this embodiment and embodiment 3 is that 24 parts of silicon carbide fibers with a length of 1 mm and 6 parts of aromatic sulfone fibers with a length of 2 mm are added.

[0048] Example 5

[0049] The only difference between this embodiment and embodiment 3 is that 15 parts of silicon carbide fibers with a length of 1 mm and 15 parts of aromatic sulfone fibers with a length of 2 mm are added.

[0050] Example 6

[0051] The only difference between this embodiment and embodiment 3 is that 25 parts of silicon carbide fibers with a length of 1 mm and 5 parts of aromatic sulfone fibers with a length of 2 mm are added.

[0052] Example 7

[0053] The only difference between this embodiment and embodiment 4 is that 24 parts of silicon carbide fibers with a length of 1 mm and 6 parts of aromatic sulfone fibers with a length of 3 mm are added.

[0054] Example 8

[0055] The only difference between this embodiment and embodiment 4 is that 24 parts of silicon carbide fibers with a length of 1 mm and 6 parts of aromatic sulfone fibers with a length of 4 mm are added.

[0056] Example 9

[0057] The difference between this embodiment and embodiment 7 is that white carbon black is loaded on the surface of ceramic fiber and aromatic sulfone fiber, and the preparation method thereof comprises the following steps:

[0058] S1. Ultrasonic dispersion of silica in a 2% by volume silane coupling agent solution for 1 hour, and drying to obtain modified silica, wherein the mass of the silane coupling agent is 0.2 times the mass of the silica;

[0059] S2, dispersing the ceramic fiber and the aromatic sulfone fiber in a dilute hydrochloric acid solution with a volume fraction of 0.5%, stirring for 40 minutes, and washing with water until neutral, to obtain modified ceramic fiber and aromatic sulfone fiber;

[0060] S3. Add the modified silica, modified silicon carbide fiber, aramid fiber and Tween 80 into water, mix at 80°C for 6 hours, react, wash and dry to obtain silicon carbide fiber and aramid fiber loaded with silica on the surface, wherein the mass of Tween 80 is 0.5 times the mass of silica.

[0061] Example 10

[0062] The difference between this embodiment and embodiment 7 is that white carbon black is loaded on the surface of ceramic fiber and aromatic sulfone fiber, and the preparation method thereof comprises the following steps:

[0063] S1. Ultrasonic dispersion of silica in a 0.1% by volume silane coupling agent solution for 2 h, followed by drying to obtain modified silica, wherein the mass of the silane coupling agent is 0.2 times the mass of the silica;

[0064] S2, dispersing silicon carbide fiber and aromatic sulfone fiber in a dilute hydrochloric acid solution with a volume fraction of 0.1%, stirring for 60 minutes, and washing with water until neutral to obtain modified silicon carbide fiber and aromatic sulfone fiber;

[0065] S3. Add the modified silica, modified silicon carbide fiber and aramid fiber, and Tween 80 into water, mix at 90° C. for 4 hours, react, wash, and dry to obtain silicon carbide fiber and aramid fiber loaded with silica on the surface, wherein the mass of Tween 80 is 0.5 times the mass of silica.

[0066] Comparative Example 1

[0067] The difference between this comparative example and Example 3 is that only 30 parts of silicon carbide fibers with a length of 1 mm are added, and no aromatic sulfone fibers with a length of 2 mm are added.

[0068] Comparative Example 2

[0069] The difference between this comparative example and Example 3 is that only 30 parts of 2 mm long arylsulfone fibers are added, and no 1 mm long silicon carbide fibers are added.

[0070] High temperature resistance test

[0071] According to the standard GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", the tensile strength and elongation at break of the high temperature resistant conveyor belts prepared in Examples 1 to 9 and Comparative Examples 1 to 2 were tested at room temperature (28°C), as well as the tensile strength and elongation at break after being placed at 180°C for 168 hours. The test results are shown in Table 1:

[0072] Table 1 High temperature resistance performance test results of high temperature resistant conveyor belt

[0073]

[0074] By comparing the data of Examples 1 to 10 and Comparative Examples 1 to 2, it is found that compared with the comparative examples, the tensile strength and elongation at break of the high temperature resistant conveyor belts prepared in the examples are higher before and after high temperature; compared with Example 3, the tensile strength and elongation at break of the high temperature resistant conveyor belts prepared in Examples 7 to 8 are better; compared with Example 7, the tensile strength and elongation at break of the high temperature resistant conveyor belts prepared in Examples 9 to 10 are better; this indicates that the high temperature resistance of the conveyor belt is synergistically improved by adding ceramic fibers and aromatic sulfone fibers and the length grading of the two, and at the same time, white carbon black is loaded on the surface of the ceramic fibers and aromatic sulfone fibers, so that the white carbon black fills and coats the surface of the fibers and is added to the rubber matrix, thereby further improving the high temperature resistance of the high temperature resistant conveyor belt.

[0075] According to the standard GB / T 9867-2008 "Determination of wear resistance of vulcanized rubber or thermoplastic rubber (rotating roller abrasion machine method)", the relative volume wear of the high temperature resistant conveyor belts of Example 3 and Comparative Examples 1-2 was tested. The test results are shown in Table 2:

[0076] Table 2 Wear resistance test of high temperature resistant conveyor belt

[0077]

[0078] By comparing the data of Example 3 and Comparative Examples 1-2, it is found that compared with Comparative Examples 1-2, the relative volume wear of the high temperature resistant conveyor belt of Example 3 is less, indicating that adding ceramic fiber and aromatic sulfone fiber can improve the wear resistance of the high temperature resistant conveyor belt.

[0079] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature resistant conveyor belt, It is characterized in that The high temperature resistant conveyor belt comprises a skeleton layer and a rubber coating layer; the rubber coating layer comprises the following components in parts by weight: 40-60 parts of styrene-butadiene rubber, 10-20 parts of EPDM rubber, 15-20 parts of chloroprene rubber, 15-25 parts of ceramic fiber, 5-15 parts of aromatic sulfone fiber, 2-4 parts of vulcanizing agent, 1-2 parts of accelerator, 1-2 parts of zinc oxide, 0.5-1 parts of stearic acid, 5-10 parts of white carbon black, and 1-2 parts of antioxidant; the skeleton layer is nylon canvas; the rubber coating layer and the skeleton layer are bonded with phenolic resin.

2. A high temperature resistant conveyor belt according to claim 1, It is characterized in that The mass ratio of the ceramic fiber to the aromatic sulfone fiber is 2:1 to 4:

1.

3. A high temperature resistant conveyor belt according to claim 1, It is characterized in that The white carbon black is loaded on the surfaces of the ceramic fiber and the aromatic sulfone fiber.

4. A high temperature resistant conveyor belt according to claim 3, It is characterized in that The preparation method of white carbon black loaded on the surface of ceramic fiber and aromatic sulfone fiber comprises the following steps: S1, ultrasonically dispersing white carbon black in a silane coupling agent solution, and drying to obtain modified white carbon black; S2, dispersing the ceramic fiber and the aromatic sulfone fiber in a dilute hydrochloric acid solution, stirring, and washing with water until neutral, to obtain modified ceramic fiber and aromatic sulfone fiber; S3, adding the modified silica, the modified ceramic fiber and the aramid fiber, and the emulsifier into water, mixing, washing, and drying to obtain the ceramic fiber and the aramid fiber with the silica loaded on the surface.

5. A high temperature resistant conveyor belt according to claim 4, It is characterized in that The ultrasonic dispersion time in S1 is 1-2 hours; the stirring time in S2 is 40-60 minutes; the mixing time in S3 is 4-6 hours, and the temperature is 80-90°C.

6. A high temperature resistant conveyor belt according to claim 4, It is characterized in that The volume fraction of the silane coupling agent solution is 0.1%-2%; the volume fraction of the dilute hydrochloric acid solution is 0.1-0.5%; the mass of the emulsifier is 0.5 times the mass of white carbon black; and the mass of the silane coupling agent is 0.2 times the mass of white carbon black.

7. A high temperature resistant conveyor belt according to claim 1, It is characterized in that The length of the ceramic fiber is 1-2 mm; the length of the aromatic sulfone fiber is 3-4 mm.

8. A high temperature resistant conveyor belt according to claim 4, It is characterized in that The ceramic fiber is one or more of aluminum silicate fiber, alumina fiber and silicon carbide fiber; the vulcanizing agent is sulfur; the accelerator is one of accelerator CZ, accelerator TMTD and accelerator DM; the emulsifier is one of Tween 80 and Span 80; the antioxidant is one of antioxidant 1010, antioxidant 4020 and antioxidant 4010.

9. The method for preparing a high temperature resistant conveyor belt according to claim 1, It is characterized in that The following steps are involved: A1, mixing styrene-butadiene rubber, EPDM rubber and chloroprene rubber, adding stearic acid, zinc oxide, accelerator, antioxidant, ceramic fiber, aromatic sulfone fiber and white carbon black in sequence, and finally adding vulcanizing agent, producing sheets to obtain a mixed rubber; A2, the skeleton layer is immersed in a phenolic resin adhesive to obtain an impregnated skeleton layer; A3. The mixed rubber is laminated on the upper and lower surfaces of the impregnated skeleton layer, and after vulcanization, a high temperature resistant conveyor belt is obtained.

10. A method for preparing a high temperature resistant conveyor belt according to claim 9, It is characterized in that The mixing temperature in A1 is 70-90°C; the calendering temperature in A3 is 85-95°C, and the vulcanization temperature is 150-160°C.

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