A rubber conveyor belt and a method of manufacturing the same

Abstract

The application relates to the technical field of rubber conveying belts, and discloses a rubber conveying belt and a preparation method thereof. The rubber conveying belt comprises a framework layer and a covering rubber arranged on at least one surface of the framework layer, and the covering rubber comprises the following components in parts by weight: natural rubber 70-80 parts, butadiene rubber 10-20 parts, styrene-butadiene rubber 20-30 parts, zinc oxide 6-8 parts, stearic acid 2-3 parts, solid coumarone resin 3-4 parts, rubber protective wax 2-3 parts, aromatic oil 5-6 parts, antioxidant 3-4 parts, dispersing agent 1.5-2.5 parts, inorganic filler 38-45 parts, vulcanizing agent 0.5-1 part, accelerator 2.5-3.5 parts, adhesive 4-6 parts and water slurry loaded aminonaphthol compound 8-12 parts. Through the technical scheme, the problems of low strength and poor aging resistance of the rubber conveying belt in the related art are solved.

Description

Technical Field

[0001] This invention relates to the field of rubber conveyor belt technology, specifically to a rubber conveyor belt and its preparation method. Background Technology

[0002] Rubber conveyor belts, as core equipment in the material handling field, are widely used in industrial scenarios such as mining, port transshipment, building materials production, and power transmission. Their service environments often involve complex conditions such as high-intensity mechanical friction, frequent stress tension, alternating high and low temperatures, outdoor ultraviolet radiation, and humid heat corrosion. Therefore, the cover rubber, as the key surface layer of the rubber conveyor belt that directly contacts the materials and withstands the effects of the external environment, directly determines the service life, operational safety, and maintenance costs of the conveyor belt due to its strength and aging resistance.

[0003] To improve the strength and aging resistance of the cover rubber, current methods often include optimizing the rubber matrix ratio, replacing conventional fillers, or compounding multiple antioxidants. However, the effects are relatively limited. While these methods can improve individual properties to some extent, they often fail to achieve a synergistic improvement in mechanical strength and aging resistance. Furthermore, some fillers suffer from poor dispersibility and insufficient compatibility with the rubber matrix, limiting their effectiveness and preventing them from fully realizing their potential. Therefore, there is an urgent need for a rubber conveyor belt with high strength and good aging resistance. Summary of the Invention

[0004] This invention proposes a rubber conveyor belt and its preparation method, which solves the problems of low strength and poor aging resistance of rubber conveyor belts in related technologies.

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

[0006] This invention proposes a rubber conveyor belt, comprising a skeleton layer and a cover rubber disposed on at least one side of the skeleton layer. The cover rubber comprises the following components in parts by weight: 70-80 parts natural rubber, 10-20 parts butadiene rubber, 20-30 parts styrene-butadiene rubber, 6-8 parts zinc oxide, 2-3 parts stearic acid, 3-4 parts solid coumarone resin, 2-3 parts rubber protective wax, 5-6 parts aromatic oil, 3-4 parts antioxidant, 1.5-2.5 parts dispersant, 38-45 parts inorganic filler, 0.5-1 part vulcanizing agent, 2.5-3.5 parts accelerator, 4-6 parts adhesive, and 8-12 parts hydrotalcite-supported aminonaphthol compound.

[0007] As a further technical solution, the preparation method of the hydrotalcite-supported aminonaphthol compound includes the following steps:

[0008] The aminonaphthol compound, hydrotalcite, and ethanol were mixed, stirred, and dried to obtain the hydrotalcite-supported aminonaphthol compound.

[0009] As a further technical solution, the mass ratio of the aminonaphthol compound to hydrotalcite is 0.5~0.9:5;

[0010] The mass ratio of hydrotalcite to ethanol is 5g:75~100mL.

[0011] As a further technical solution, the aminonaphthol compound is 1-acetamido-7-naphthol and / or 1-methoxycarbonylamino-7-naphthol; preferably, the aminonaphthol compound is 1-acetamido-7-naphthol and 1-methoxycarbonylamino-7-naphthol.

[0012] In the rubber conveyor belt of this invention, by loading 1-acetamino-7-naphthol and 1-methoxycarbonyl-7-naphthol onto hydrotalcite, the acetamino group has less steric hindrance, making it easier to combine with free radicals generated during rubber aging, resulting in a faster combination rate. The methoxycarbonyl group has strong hydrophobicity and moderate steric hindrance, making it less prone to molecular aggregation after being loaded onto hydrotalcite, thus improving the combination efficiency with free radicals. The two work synergistically to further improve the aging resistance of the cover rubber, thereby further improving the aging resistance of the rubber conveyor belt.

[0013] As a further technical solution, when the aminonaphthol compound is 1-acetamido-7-naphthol and 1-methoxycarbonyl-7-naphthol, the mass ratio of 1-acetamido-7-naphthol to 1-methoxycarbonyl-7-naphthol is 1:3 to 5:7.

[0014] As a further technical solution, the antioxidant includes one or more of antioxidant MB, antioxidant RD, and antioxidant BLE-W.

[0015] As a further technical solution, the vulcanizing agent is sulfur.

[0016] As a further technical solution, the accelerator is accelerator CZ and accelerator TMTD.

[0017] In the rubber conveyor belt of this invention, accelerators CZ and TMTD are used in combination. Accelerator TMTD can quickly initiate the cross-linking reaction between rubber molecular chains in the early stage of vulcanization, while accelerator CZ continuously and stably promotes the cross-linking reaction in the subsequent stage. The two work together to make the vulcanization reaction more efficient and uniform.

[0018] As a further technical solution, the inorganic filler includes one or two of carbon black and silica.

[0019] As a further technical solution, the carbon black includes N234 carbon black and N550 carbon black.

[0020] In the rubber conveyor belt of this invention, N234 carbon black and N550 carbon black are selected as fillers. N234 carbon black has a relatively small particle size and a large specific surface area, so it can form more physical adsorption and chemical binding sites with rubber molecules. Through the interaction with rubber molecules, it restricts the movement of molecular chains, thereby improving the strength, hardness and wear resistance of rubber. N550 carbon black has a larger particle size, which can form a relatively loose network structure in rubber, reduce the viscosity of rubber compound, and improve the mixing and molding processing performance.

[0021] As a further technical solution, the adhesive includes adhesive AS-88.

[0022] In the rubber conveyor belt of this invention, adhesive AS-88 is used as the adhesive. One end of the AS-88 molecule can react chemically with the active sites on the rubber molecular chain to form a covalent bond; the other end can connect with the active groups on the surface of the filler, which enhances the interfacial bonding force between the rubber and the filler, allowing the filler to be better dispersed in the rubber matrix, forming a uniform and stable overall structure, improving the mechanical properties of the cover rubber, and thus improving the mechanical properties of the rubber conveyor belt.

[0023] As a further technical solution, the dispersant includes dispersant AT-B.

[0024] This invention also proposes a method for preparing a rubber conveyor belt, comprising the following steps:

[0025] The components of the cover rubber are mixed according to the stated weight proportions to obtain the cover rubber; the cover rubber and the skeleton layer are directly bonded together, calendered, and vulcanized to obtain the rubber conveyor belt.

[0026] The working principle and beneficial effects of this invention are as follows:

[0027] In this invention, by loading aminonaphthol compounds onto hydrotalcite, the tear strength and aging resistance of the cover rubber are improved. Loading aminonaphthol compounds onto hydrotalcite improves the compatibility between the hydrotalcite and the rubber matrix, inhibits the aggregation of hydrotalcite particles, and results in more uniform dispersion of hydrotalcite in the cover rubber, leading to a denser structure and thus improved tear strength. Simultaneously, the layered structure of the hydrotalcite reduces the contact between the rubber and oxygen, and the aminonaphthol compounds can capture aging free radicals, terminating chain reactions and further improving the aging resistance of the cover rubber. Detailed Implementation

[0028] 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.

[0029] In the following examples and comparative examples, the natural rubber is of type SCR5; the butadiene rubber is of type BR-9000; the styrene-butadiene rubber is of type SBR 1500; the solid coumarone resin is of type ELD-80, manufactured by Qingdao Xinhengda Chemical Co., Ltd.; the rubber protective wax is of type LY-01, manufactured by Nanyang Paraffin Fine Chemical Plant; the aromatic oil is of type SSDY-Ⅰ, manufactured by Shandong Furunda Chemical Co., Ltd.; the silica has a particle size of 20nm; and the hydrotalcite is magnesium aluminum hydrotalcite with a particle size of 30nm.

[0030] Example 1

[0031] The cover rubber comprises the following components in parts by weight: 70 parts natural rubber, 10 parts butadiene rubber, 20 parts styrene-butadiene rubber, 6 parts zinc oxide, 2 parts stearic acid, 3 parts solid coumarone resin, 2 parts rubber protective wax, 5 parts aromatic oil, 0.5 parts antioxidant MB, 1.5 parts antioxidant RD, 1.0 part antioxidant BLE-W, 1.5 parts dispersant AT-B, 25 parts N234 carbon black, 8 parts N550 carbon black, 5 parts silica, 0.5 parts sulfur, 1.5 parts accelerator CZ, 1.0 part accelerator TMTD, 4 parts adhesive AS-88, and 8 parts hydrotalcite-supported aminonaphthol compounds.

[0032] A method for preparing aminonaphthol compounds supported on hydrotalcite includes the following steps:

[0033] 6g of 1-amino-7-naphthol, 50g of hydrotalcite and 750mL of ethanol were mixed, stirred for 4h, and dried to obtain hydrotalcite-supported aminonaphthol compounds.

[0034] The method for preparing a rubber conveyor belt includes the following steps:

[0035] The components of the cover rubber are mixed according to the above weight proportions to obtain the cover rubber; the cover rubber is bonded to the upper and lower surfaces of the skeleton layer, calendered, and vulcanized to obtain the rubber conveyor belt.

[0036] Example 2

[0037] The cover rubber comprises the following components in parts by weight: 80 parts natural rubber, 20 parts butadiene rubber, 30 parts styrene-butadiene rubber, 8 parts zinc oxide, 3 parts stearic acid, 4 parts solid coumarone resin, 3 parts rubber protective wax, 6 parts aromatic oil, 4 parts antioxidant MB, 2.5 parts dispersant AT-B, 45 parts silica, 1 part sulfur, 1.5 parts accelerator CZ, 2.0 parts accelerator TMTD, 6 parts adhesive AS-88, and 12 parts hydrotalcite-supported aminonaphthol compound;

[0038] A method for preparing aminonaphthol compounds supported on hydrotalcite includes the following steps:

[0039] 5g of 1-amino-7-naphthol, 50g of hydrotalcite and 1000mL of ethanol were mixed, stirred for 4h, and dried to obtain hydrotalcite-supported aminonaphthol compounds.

[0040] The method for preparing a rubber conveyor belt includes the following steps:

[0041] The components of the cover rubber are mixed according to the above weight proportions to obtain the cover rubber; the cover rubber is bonded to the upper and lower surfaces of the skeleton layer, calendered, and vulcanized to obtain the rubber conveyor belt.

[0042] Example 3

[0043] The cover rubber comprises the following components in parts by weight: 75 parts natural rubber, 15 parts butadiene rubber, 25 parts styrene-butadiene rubber, 7 parts zinc oxide, 2.5 parts stearic acid, 3.5 parts solid coumarone resin, 2.5 parts rubber protective wax, 5.5 parts aromatic oil, 3.5 parts antioxidant RD, 2 parts dispersant AT-B, 25 parts N234 carbon black, 15 parts N550 carbon black, 0.8 parts sulfur, 1.5 parts accelerator CZ, 1.5 parts accelerator TMTD, 5 parts adhesive AS-88, and 10 parts hydrotalcite-supported aminonaphthol compound.

[0044] A method for preparing aminonaphthol compounds supported on hydrotalcite includes the following steps:

[0045] 9g of 1-amino-7-naphthol, 50g of hydrotalcite and 1000mL of ethanol were mixed, stirred for 4h, and dried to obtain hydrotalcite-supported aminonaphthol compounds.

[0046] The method for preparing a rubber conveyor belt includes the following steps:

[0047] The components of the cover rubber are mixed according to the above weight proportions to obtain the cover rubber; the cover rubber is bonded to the upper and lower surfaces of the skeleton layer, calendered, and vulcanized to obtain the rubber conveyor belt.

[0048] Example 4

[0049] The only difference between this embodiment and Example 1 is that 1-amino-7-naphthol is replaced with 1-acetamido-7-naphthol.

[0050] Example 5

[0051] The only difference between this embodiment and Example 1 is that 1-amino-7-naphthol is replaced with 1-methoxycarbonylamino-7-naphthol.

[0052] Example 6

[0053] The only difference between this embodiment and Example 1 is that 6g of 1-amino-7-naphthol is replaced with 2.5g of 1-acetamido-7-naphthol and 3.5g of 1-methoxycarbonyl-7-naphthol.

[0054] Example 7

[0055] The only difference between this embodiment and Example 1 is that 6g of 1-amino-7-naphthol is replaced with 1.5g of 1-acetamido-7-naphthol and 4.5g of 1-methoxycarbonyl-7-naphthol.

[0056] Example 8

[0057] The only difference between this embodiment and Example 1 is that 6g of 1-amino-7-naphthol is replaced with 1g of 1-acetamido-7-naphthol and 5g of 1-methoxycarbonyl-7-naphthol.

[0058] Example 9

[0059] The only difference between this embodiment and Example 1 is that 6g of 1-amino-7-naphthol is replaced with 4g of 1-acetamido-7-naphthol and 2g of 1-methoxycarbonyl-7-naphthol.

[0060] Comparative Example 1

[0061] The only difference between this comparative example and Example 1 is that 1-amino-7-naphthol is replaced with 1-naphthylamine-5-sulfonic acid.

[0062] Comparative Example 2

[0063] The only difference between this comparative example and Example 1 is that 1-amino-7-naphthol is replaced with 6-hydroxy-2-naphthoic acid.

[0064] Comparative Example 3

[0065] The only difference between this comparative example and Example 1 is that the aminonaphthol compound loaded on hydrotalcite is replaced with hydrotalcite.

[0066] The aging resistance tests were conducted on the cover adhesives prepared in Examples 1-9 and Comparative Examples 1-3, respectively:

[0067] Tear strength: The tear strength of the cover rubber before aging was determined according to the test method specified in GB / T 529-2008 "Determination of tear strength of vulcanized rubber or thermoplastic rubber (trouser-shaped, right-angled and crescent-shaped specimens)". The specimen was a right-angled specimen with a cut depth of 1 mm and the test temperature was 25℃.

[0068] Aging resistance: The cover rubber was subjected to a heat aging test according to the method specified in GB / T 3512-2014 "Accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber in hot air". The aging temperature was 150℃ and the aging time was 120h. The tear strength after aging was tested according to the above method, and the tear strength change rate was calculated; Tear strength change rate = (tear strength before aging - tear strength after aging) / tear strength before aging × 100%;

[0069] The results are shown in Table 1 below.

[0070] Table 1 Results of Aging Resistance Test

[0071]

[0072] By comparing the data of Example 1 and Comparative Examples 1-3, it was found that the tear strength of the cover rubber prepared by loading aminonaphthol compounds onto hydrotalcite in Example 1 was greater than that of Comparative Examples 1-3, and the tear strength change rate was smaller than that of Comparative Examples 1-3. This indicates that by adding aminonaphthol compounds loaded onto hydrotalcite as functional additives, the tear strength and aging resistance of the cover rubber can be improved, thereby improving the strength and aging resistance of the rubber conveyor belt.

[0073] By comparing the data from Examples 1 and 4-5, the tear strength of the cover rubber prepared in Examples 4-5 was greater than that in Example 1. This indicates that by adding hydrotalcite-loaded aminonaphthol compounds, and when the aminonaphthol compounds are 1-acetamido-7-naphthol or 1-methoxycarbonyl-7-naphthol, the tear strength of the cover rubber can be further improved, thereby increasing the strength of the rubber conveyor belt.

[0074] Comparing the data from Examples 1 and 4-9, the tear strength variation rate of the cover rubber prepared in Examples 6-9 was smaller than that of Examples 1 and 4-5. This indicates that the aging resistance of the cover rubber can be improved by adding hydrotalcite-loaded aminonaphthol compounds, especially when the aminonaphthol compounds are 1-acetamido-7-naphthol and 1-methoxycarbonyl-7-naphthol. Comparing the data from Examples 6-9, Examples 6-7 further improved the aging resistance of the cover rubber by optimizing the mass ratio of 1-acetamido-7-naphthol to 1-methoxycarbonyl-7-naphthol to 5:7 to 1:3, thereby further improving the aging resistance of the rubber conveyor belt.

[0075] 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. A rubber conveyor belt, characterized in that, The material includes a skeleton layer and a cover adhesive disposed on at least one side of the skeleton layer. The cover adhesive comprises the following components in parts by weight: 70-80 parts natural rubber, 10-20 parts butadiene rubber, 20-30 parts styrene-butadiene rubber, 6-8 parts zinc oxide, 2-3 parts stearic acid, 3-4 parts solid coumarone resin, 2-3 parts rubber protective wax, 5-6 parts aromatic oil, 3-4 parts antioxidant, 1.5-2.5 parts dispersant, 38-45 parts inorganic filler, 0.5-1 part vulcanizing agent, 2.5-3.5 parts accelerator, 4-6 parts adhesive, and 8-12 parts hydrotalcite-supported aminonaphthol compound. The aminonaphthol compounds are 1-acetamido-7-naphthol and 1-methoxycarbonyl-7-naphthol; The mass ratio of 1-acetamido-7-naphthol to 1-methoxycarbonyl-7-naphthol is 1:3 to 5:

7.

2. The rubber conveyor belt according to claim 1, characterized in that, The method for preparing the hydrotalcite-supported aminonaphthol compound includes the following steps: The aminonaphthol compound, hydrotalcite, and ethanol were mixed, stirred, and dried to obtain the hydrotalcite-supported aminonaphthol compound.

3. A rubber conveyor belt according to claim 2, characterized in that, The mass ratio of the aminonaphthol compound to the hydrotalcite is 0.5~0.9:5; The mass ratio of hydrotalcite to ethanol is 5g:75~100mL.

4. A rubber conveyor belt according to claim 1, characterized in that, The antioxidants include one or more of antioxidants MB, antioxidant RD, and antioxidant BLE-W.

5. A rubber conveyor belt according to claim 1, characterized in that, The vulcanizing agent is sulfur.

6. A rubber conveyor belt according to claim 1, characterized in that, The accelerators are accelerator CZ and accelerator TMTD.

7. A rubber conveyor belt according to claim 1, characterized in that, The inorganic filler includes one or both of carbon black and silica.

8. A method for preparing a rubber conveyor belt, used to prepare a rubber conveyor belt according to any one of claims 1 to 7, characterized in that, Includes the following steps: The components of the cover rubber are mixed according to the stated weight proportions to obtain the cover rubber; the cover rubber and the skeleton layer are directly bonded together, calendered, and vulcanized to obtain the rubber conveyor belt.

Images