Environment-friendly heat-resistant and wear-resistant white conveying belt and preparation method thereof

Abstract

The present application relates to the technical field of conveying belt, and proposes an environment-friendly heat-resistant and wear-resistant white conveying belt and a preparation method thereof, which comprises a framework layer and a covering rubber layer, the covering rubber layer comprises an upper covering rubber layer and a lower covering rubber layer, and the covering rubber layer comprises the following components by weight: 90-110 parts of ethylene-propylene rubber, 40-50 parts of white carbon black, 10-15 parts of titanium white, 10-15 parts of paraffin oil, 6-10 parts of activator, 2-2.5 parts of antioxidant, 1.4-1.8 parts of crosslinking agent, 2.5-3.5 parts of vulcanizing agent, 1-2 parts of microcrystalline wax, 1.5-2.5 parts of tackifier, 1.5-2 parts of wear-resistant agent, and 2-5 parts of 4,4'-cyclohexylidene diphenylamine. Through the above technical solution, the problem of poor heat resistance and wear resistance of the conveying belt in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of conveyor belt technology, specifically to an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt and its preparation method. Background Technology

[0002] The conveyor belt is the main component of a belt conveyor, serving to carry materials. It is widely used in continuous transportation in industries such as steel, coal, alloys, chemicals, building materials, and grain. The transported materials include lumps, powders, pastes, and packaged goods. Compared with other transportation methods, using conveyor belts as the transport carrier has advantages such as ease of use, safe operation, easy maintenance, continuous operation, shorter transportation distances, and savings in manpower and resources.

[0003] During operation, the cover rubber layer of a conveyor belt comes into direct contact with high-temperature materials. Low heat resistance can lead to cracking and other problems, while low abrasion resistance can cause severe wear on the cover rubber layer, affecting normal material transport and shortening the conveyor belt's lifespan. Therefore, there is a need for a conveyor belt with good heat and abrasion resistance. Summary of the Invention

[0004] This invention proposes an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt and its preparation method, which solves the problem of poor heat resistance and wear resistance of conveyor belts in related technologies.

[0005] The technical solution of the present invention is as follows:

[0006] An environmentally friendly, heat-resistant, and wear-resistant white conveyor belt includes a skeleton layer and a cover rubber layer. The cover rubber layer includes an upper cover rubber layer and a lower cover rubber layer. The cover rubber layer comprises the following raw materials in parts by weight: 90-110 parts ethylene propylene rubber, 40-50 parts silica, 10-15 parts titanium dioxide, 10-15 parts paraffin oil, 6-10 parts activator, 2-2.5 parts antioxidant, 1.4-1.8 parts crosslinking agent, 2.5-3.5 parts vulcanizing agent, 1-2 parts microcrystalline wax, 1.5-2.5 parts tackifier, 1.5-2 parts wear-resistant agent, and 2-5 parts 4,4'-cyclohexylene diphenylamine.

[0007] As a further technical solution, the activator is zinc oxide.

[0008] As a further technical solution, the skeleton layer consists of an upper skeleton layer and a lower skeleton layer, and the material of the skeleton layer is nylon canvas treated with adhesive solution.

[0009] As a further technical solution, the impregnation solution is a water-soluble resin impregnation solution.

[0010] As a further technical solution, the ethylene propylene rubber is composed of binary ethylene propylene rubber and ternary ethylene propylene rubber.

[0011] As a further technical solution, the ethylene propylene rubber is composed of binary ethylene propylene rubber J-0050 and ternary ethylene propylene rubber 5601.

[0012] As a further technical solution, the binary ethylene propylene rubber is 40%-60% of the mass of ethylene propylene rubber.

[0013] As a further technical solution, the binary ethylene propylene rubber is 50% of the mass of the ethylene propylene rubber.

[0014] As a further technical solution, the particle size of the silica is 200-400 mesh.

[0015] As a further technical solution, the mass ratio of the silica to 4,4'-cyclohexylene diphenylamine is 10-25:1.

[0016] As a further technical solution, the mass ratio of the silica to 4,4'-cyclohexylene diphenylamine is 12.5:1.

[0017] The present invention has found that when the mass ratio of silica to 4,4'-cyclohexylene diphenylamine is 10-25:1, the wear resistance and heat resistance of the conveyor belt cover rubber layer can be improved better, and when the mass ratio of silica to 4,4'-cyclohexylene diphenylamine is 12.5:1, the wear resistance and heat resistance of the prepared conveyor belt cover rubber layer are the best.

[0018] As a further technical solution, the method for preparing the covering adhesive layer includes the following steps:

[0019] S1. After plasticizing ethylene propylene rubber, plasticized rubber is obtained;

[0020] S2. Add silica and 4,4'-cyclohexylene diphenylamine to the plasticized rubber and mix them to obtain the compounded rubber.

[0021] S3. Add the remaining components to the compound, and after mixing and calendering, obtain the covering rubber layer.

[0022] As a further technical solution, the plasticizing temperature in S1 is 40-50℃, and the plasticizing time is 8-10 minutes.

[0023] As a further technical solution, the mixing temperature in S2 is 120-130℃, and the mixing time is 3-6 minutes.

[0024] As a further technical solution, the mixing temperature in S3 is 120-130℃, and the mixing time is 8-10 minutes.

[0025] The present invention also includes a method for preparing an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt, comprising the following steps: laminating the belt in the order of lower cover rubber layer, skeleton layer, and upper cover rubber layer from bottom to top, followed by calendering and vulcanization to obtain an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt.

[0026] As a further technical solution, the thickness of the upper cover adhesive layer is 6-12mm, and the thickness of the lower cover adhesive layer is 1.5-3mm.

[0027] As a further technical solution, the vulcanization temperature is 155°C, and the mixing temperature is 15-20 min.

[0028] The working principle and beneficial effects of this invention are as follows:

[0029] 1. In this invention, the cover rubber layer of the conveyor belt is made of ethylene propylene rubber as the base material, with the addition of silica, titanium dioxide, crosslinking agent, vulcanizing agent, 4,4'-cyclohexylene diphenylamine and other auxiliary materials. The addition of 4,4'-cyclohexylene diphenylamine can not only further improve the reinforcing effect of silica in the base material and improve the wear resistance of the cover rubber layer, but also improve the heat resistance of the cover rubber layer.

[0030] 2. In this invention, the ethylene propylene rubber is composed of binary ethylene propylene rubber J-0050 and ternary ethylene propylene rubber 5601. The blending of binary ethylene propylene rubber J-0050 and ternary ethylene propylene rubber 5601 not only improves the processing performance in the preparation of the cover rubber layer, but also improves the wear resistance and heat resistance of the cover rubber layer. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] In the following embodiments and comparative examples:

[0033] Ethylene propylene diene monomer (EPDM) rubber J-0050, manufactured by PetroChina Jilin Petrochemical.

[0034] EPDM rubber 5601, manufacturer: Exxon Chemicals;

[0035] Ethylene propylene diene monomer (EPDM) rubber J-0010, manufactured by PetroChina Jilin Petrochemical.

[0036] EPDM rubber 3745, manufactured by Dow Chemical, USA;

[0037] The skeleton layer consists of two layers of nylon canvas treated with resin impregnation;

[0038] Titanium dioxide, type R, manufactured by Hebei Qicai Pigment Co., Ltd.

[0039] Paraffin oil, colorless, manufactured by Hebei Shengkang Chemical Co., Ltd.

[0040] Zinc oxide, model NC236, manufactured by Global Chemicals, Inc., USA;

[0041] Microcrystalline wax, model 160S, melting point 65.5-76.6℃, manufactured by Southeast Petrochemical, South Korea;

[0042] Tackifier, model MK-140, manufactured by Dongguan Bailing New Materials Co., Ltd.

[0043] Wear-resistant agent, model WR-651D, manufactured by Dongguan Shanmu New Materials Co., Ltd.

[0044] Example 1

[0045] A method for preparing an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt includes the following steps:

[0046] S1. Plasticize 90 parts of ethylene propylene rubber at 40℃ for 10 min to obtain plasticized rubber; wherein the ethylene propylene rubber is composed of binary ethylene propylene rubber J-0050 and ternary ethylene propylene rubber 5601 in a mass ratio of 2:3.

[0047] S2. Add 40 parts of 200 mesh silica and 2 parts of 4,4'-cyclohexylene diphenylamine to the plasticized rubber and mix at 120°C for 6 minutes to obtain the compounded rubber.

[0048] S3. Add 10 parts titanium dioxide, 10 parts paraffin oil, 6 parts zinc oxide, 2 parts antioxidant MB, 1.4 parts crosslinking agent TAIC, 2.5 parts vulcanizing agent DCP, 1 part microcrystalline wax, 1.5 parts tackifier, and 1.5 parts abrasion resistant agent to the compound rubber. Continue to mix at 120℃ for 10 minutes, and calender to obtain a 6mm upper cover rubber layer and a 1.5mm lower cover rubber layer.

[0049] S4. The layers are bonded in the following order from bottom to top: lower cover rubber layer, skeleton layer, and upper cover rubber layer. After calendering and vulcanization at 155℃ for 15 minutes, an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt is obtained.

[0050] Example 2

[0051] A method for preparing an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt includes the following steps:

[0052] S1. 100 parts of ethylene propylene rubber were plasticized at 45°C for 9 minutes to obtain plasticized rubber; wherein the ethylene propylene rubber was composed of binary ethylene propylene rubber J-0050 and ternary ethylene propylene rubber 5601 in a mass ratio of 1:1.

[0053] S2. Add 45 parts of silica (400 mesh) and 3 parts of 4,4'-cyclohexylene diphenylamine to the plasticized rubber and mix at 125°C for 4 min to obtain the compounded rubber.

[0054] S3. Add 13 parts titanium dioxide, 13 parts paraffin oil, 8 parts zinc oxide, 2.3 parts antioxidant MB, 1.6 parts crosslinking agent TAIC, 3 parts vulcanizing agent DCP, 1.5 parts microcrystalline wax, 2 parts tackifier, and 1.8 parts abrasion resistant agent to the compound rubber. Continue to mix at 125℃ for 9 minutes, and calender to obtain an 8mm upper cover rubber layer and a 2mm lower cover rubber layer.

[0055] S4. The layers are bonded in the following order from bottom to top: lower cover rubber layer, skeleton layer, and upper cover rubber layer. After calendering and vulcanization at 155℃ for 18 minutes, an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt is obtained.

[0056] Example 3

[0057] A method for preparing an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt includes the following steps:

[0058] S1. Plasticize 110 parts of ethylene propylene rubber at 50℃ for 8 minutes to obtain plasticized rubber; wherein the ethylene propylene rubber is composed of binary ethylene propylene rubber J-0050 and ternary ethylene propylene rubber 5601 in a mass ratio of 3:2.

[0059] S2. Add 50 parts of 325 mesh silica and 4 parts of 4,4'-cyclohexylene diphenylamine to the plasticized rubber and mix at 130°C for 3 minutes to obtain the compounded rubber.

[0060] S3. Add 15 parts titanium dioxide, 15 parts paraffin oil, 10 parts zinc oxide, 2.5 parts antioxidant MB, 1.8 parts crosslinking agent TAIC, 3.5 parts vulcanizing agent DCP, 2 parts microcrystalline wax, 2.5 parts tackifier, and 2 parts abrasion resistant agent to the compound rubber. Continue to mix at 130℃ for 8 minutes, and calender to obtain a 12mm upper cover rubber layer and a 3mm lower cover rubber layer, respectively.

[0061] S4. The layers are bonded in the following order from bottom to top: lower cover rubber layer, skeleton layer, and upper cover rubber layer. After calendering and vulcanization at 155℃ for 20 minutes, an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt is obtained.

[0062] Example 4

[0063] The difference between this embodiment and Embodiment 1 is that the mass ratio of ethylene propylene diene monomer (EPDM) rubber J-0050 to ethylene propylene diene monomer (EPDM) rubber 5601 is 1:1.

[0064] Example 5

[0065] The difference between this embodiment and Embodiment 1 is that the mass ratio of binary ethylene propylene rubber J-0050 to ternary ethylene propylene rubber 5601 is 3:2.

[0066] Example 6

[0067] The difference between this embodiment and Embodiment 1 is that the EPDM rubber 5601 is replaced with an equal amount of EPDM rubber J-0050.

[0068] Example 7

[0069] The difference between this embodiment and Embodiment 1 is that the binary ethylene propylene rubber J-0050 is replaced with an equal amount of ternary ethylene propylene rubber 5601.

[0070] Example 8

[0071] The difference between this embodiment and Embodiment 1 is that the ethylene propylene diene monomer (EPDM) rubber J-0050 is replaced with an equal amount of EPDM rubber J-0010.

[0072] Example 9

[0073] The difference between this embodiment and Embodiment 1 is that the EPDM rubber 5601 is replaced with an equal amount of EPDM rubber 3745.

[0074] Example 10

[0075] The difference between this embodiment and Embodiment 3 is that the amount of 4,4'-cyclohexylene diphenylamine is 5 parts.

[0076] Example 11

[0077] The difference between this embodiment and Embodiment 3 is that the amount of 4,4'-cyclohexylene diphenylamine is 2 parts.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 3 is that 4,4'-cyclohexylene diphenylamine is not added.

[0080] Test case

[0081] The performance of the top cover rubber layer of the environmentally friendly, heat-resistant, and wear-resistant white conveyor belts prepared in the examples and comparative examples was tested using the following methods:

[0082] Abrasion: The abrasion resistance of the upper cover rubber layer of the environmentally friendly heat-resistant and abrasion-resistant white conveyor belt was determined according to the test method in GB / T 9867-2008 "Determination of abrasion resistance of vulcanized rubber or thermoplastic rubber (rotary roller abrasion tester method)".

[0083] Heat resistance: The tensile strength and elongation at break of the upper cover rubber layer before and after heat treatment were determined according to the test method in GB / T 20021-2017 "Heat-resistant conveyor belt with canvas core". The change rate of tensile strength and elongation at break was calculated, and the formulas are as follows: Change rate of tensile strength (%) = (Tensile strength after heat treatment / Tensile strength after heat treatment - 1) × 100%, Change rate of elongation at break (%) = (Elongation at break after heat treatment / Elongation at break after heat treatment - 1) × 100%. The heat treatment conditions are 180℃ × 168h.

[0084] The measurement results are shown in Table 1.

[0085] Table 1. Performance of the environmentally friendly, heat-resistant, and wear-resistant white conveyor belts in the examples and comparative examples.

[0086]

[0087] Compared with Example 3, Comparative Example 1 did not add 4,4'-cyclohexylene diphenylamine. As a result, the changes in tensile strength, elongation at break, and wear of the conveyor belt cover rubber layer in Comparative Example 1 were all higher than those in Example 3. This indicates that adding 4,4'-cyclohexylene diphenylamine can not only improve the wear resistance of the conveyor belt cover rubber layer, but also improve its heat resistance.

[0088] Compared with Example 3, Examples 10-11 changed the addition of 4,4'-cyclohexylene diphenylamine. As a result, the changes in tensile strength, elongation at break, and wear of the conveyor belt cover rubber layer in Example 3 were all lower than those in Examples 10-11. This indicates that when the mass ratio of silica to 4,4'-cyclohexylene diphenylamine is 12.5:1, the wear resistance and heat resistance of the conveyor belt cover rubber layer can be further improved.

[0089] Compared with Example 1, Example 6 only added ethylene propylene diene monomer (EPDM) rubber J-0050, Example 7 only added ethylene propylene diene monomer (EPDM) rubber 5601, Example 8 replaced EPDM rubber J-0050 with an equal amount of EPDM rubber J-0010, and Example 9 replaced EPDM rubber 5601 with an equal amount of EPDM rubber 3745. The results showed that the changes in tensile strength, elongation at break, and abrasion of the conveyor belt cover rubber layer in Examples 6-9 were all higher than those in Example 1. This indicates that the compounding of EPDM rubber and EPDM rubber can give the conveyor belt cover rubber layer higher abrasion resistance and heat resistance. It also shows that the combination of EPDM rubber J-0050 and EPDM rubber 5601 can further improve the abrasion resistance and heat resistance of the conveyor belt cover rubber layer.

[0090] Compared with Example 1, Examples 4-5 changed the mass ratio of EPDM rubber J-0050 and EPDM rubber 5601. As a result, the changes in tensile strength, elongation at break, and wear of the conveyor belt cover rubber layer in Example 4 were all lower than those in Examples 1 and 5. This shows that when the mass ratio of EPDM rubber J-0050 to EPDM rubber 5601 is 1:1, the wear resistance and heat resistance of the conveyor belt cover rubber layer can be further improved.

[0091] The above are merely 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 within the protection scope of the present invention.

Claims

1. An environmentally friendly, heat-resistant, and wear-resistant white conveyor belt, comprising a skeleton layer and a cover rubber layer, wherein the cover rubber layer comprises an upper cover rubber layer and a lower cover rubber layer, characterized in that, The covering adhesive layer comprises the following raw materials in parts by weight: 90-110 parts ethylene propylene rubber, 40-50 parts silica, 10-15 parts titanium dioxide, 10-15 parts paraffin oil, 6-10 parts activator, 2-2.5 parts antioxidant, 1.4-1.8 parts crosslinking agent, 2.5-3.5 parts vulcanizing agent, 1-2 parts microcrystalline wax, 1.5-2.5 parts tackifier, 1.5-2 parts abrasion resistant agent, and 2-5 parts 4,4'-cyclohexylene diphenylamine; The mass ratio of the silica to 4,4'-cyclohexylene diphenylamine is 10-25:

1.

2. The environmentally friendly, heat-resistant, and wear-resistant white conveyor belt according to claim 1, characterized in that, The skeleton layer consists of an upper skeleton layer and a lower skeleton layer, and the material of the skeleton layer is nylon canvas treated with adhesive solution.

3. The environmentally friendly, heat-resistant, and wear-resistant white conveyor belt according to claim 2, characterized in that, The impregnation solution is a water-soluble resin impregnation solution.

4. The environmentally friendly, heat-resistant, and wear-resistant white conveyor belt according to claim 1, characterized in that, The ethylene propylene rubber is composed of binary ethylene propylene rubber and ternary ethylene propylene rubber.

5. The environmentally friendly, heat-resistant, and wear-resistant white conveyor belt according to claim 4, characterized in that, The binary ethylene propylene rubber is 40%-60% of the mass of ethylene propylene rubber.

6. The environmentally friendly, heat-resistant, and wear-resistant white conveyor belt according to claim 1, characterized in that, The particle size of the silica is 200-400 mesh.

7. The environmentally friendly, heat-resistant, and wear-resistant white conveyor belt according to claim 1, characterized in that, The method for preparing the covering adhesive layer includes the following steps: S1. After plasticizing ethylene propylene rubber, plasticized rubber is obtained; S2. Add silica and 4,4'-cyclohexylene diphenylamine to the plasticized rubber and mix them to obtain the compounded rubber. S3. Add the remaining components to the compound, and after mixing and calendering, obtain the covering rubber layer.

8. A method for preparing an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt according to any one of claims 1-7, characterized in that, Includes the following steps: The layers are bonded together in the following order from bottom to top: lower cover rubber layer, skeleton layer, and upper cover rubber layer. After calendering and vulcanization, an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt is obtained.

9. The method for preparing an environmentally friendly, heat-resistant, and wear-resistant white conveyor belt according to claim 8, characterized in that, The thickness of the upper cover adhesive layer is 6-12mm, and the thickness of the lower cover adhesive layer is 1.5-3mm.

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