A cut-resistant tread rubber composition for wide-body vehicles and a method of manufacturing the same

Abstract

The application discloses a kind of wide-body vehicle cut-resistant tread rubber and preparation method thereof, belong to tire manufacturing industry technical field.The tread rubber includes by weight parts: butadiene styrene rubber 80-100 parts, natural rubber 0-20 parts, carbon black 50-60 parts, zinc oxide 3-5 parts, stearic acid 1-2 parts, protective wax 2-3 parts, antioxidant 3-5 parts, tear-resistant resin 5-10 parts, sulfur 0.8-1.5 parts, accelerator 1-2 parts.Preparation method includes three steps of low-temperature mixing, low-temperature mixing and final mixing, low-temperature low-speed process is adopted, and discharge temperature is controlled at 130 DEG C and below.The application reduces the combination of glue generation by the synergistic effect of high butadiene styrene rubber content and tear-resistant resin, significantly improves the cut-resistant performance of tread rubber while ensuring uniform dispersion of the rubber, the tensile strength increases by 10.5% after aging, and the heat generation performance under long distance is considered, to meet the requirements of wide-body vehicle in mining area.

Description

Technical Field

[0001] This invention relates to the field of tire manufacturing technology, specifically to a cut-resistant tread compound composition for wide-body vehicles and its preparation method. Background Technology

[0002] Wide-body vehicles used in mines face poor road conditions. Due to variations in ore type, vehicle type, transport distance, speed, and load, wide-body vehicle tires require high cut resistance. For longer transport distances, the heat-generating properties of the tread compound must also be considered. Styrene-butadiene rubber (SBR), with its styrene segments in its molecular structure, exhibits high rigidity and good cut resistance; increasing SBR content improves the compound's cut resistance. However, SBR's poor self-adhesion leads to poor bonding between components during manufacturing, necessitating the addition of resin to increase adhesion. While SBR has good resistance to heat and oxygen aging, engineers previously used high-temperature, high-speed mixing processes to improve efficiency, achieving discharge temperatures of 170°C to 180°C. However, this excessive temperature resulted in a large amount of binder between carbon black and SBR, leading to high elongation at a fixed point and low elongation rate. This resulted in less molecular chain slippage when encountering obstacles, reducing cut resistance. Adjusting the tread compound formulation and mixing process can synergistically improve the tread compound's cut resistance. Summary of the Invention

[0003] This invention provides a cut-resistant tread compound composition for wide-body vehicles, which balances the cut resistance and heat generation properties of the tread compound when the transportation distance is long.

[0004] Another objective of this invention is to provide a method for preparing the aforementioned cut-resistant tread compound, which employs a low-temperature, low-speed rubber mixing process that synergizes with the properties of the cut-resistant tread compound components.

[0005] This invention is implemented as follows:

[0006] A cut-resistant tread compound for wide-body vehicles, comprising the following components by weight: 80-100 parts styrene-butadiene rubber, 0-20 parts natural rubber, 50-60 parts carbon black, 3-5 parts zinc oxide, 1-2 parts stearic acid, 2-3 parts protective wax, 3-5 parts antioxidant, 5-10 parts tear-resistant resin, 0.8-1.5 parts sulfur, and 1-2 parts accelerator.

[0007] Preferably, the composition includes 80 parts styrene-butadiene rubber, 20 parts natural rubber, 57 parts N220 carbon black, 4.5 parts zinc oxide, 2 parts stearic acid, 2 parts protective wax, 3 parts antioxidant, 9 parts tear-resistant resin, 1.5 parts sulfur, and 1.5 parts accelerator.

[0008] Preferably, the tear-resistant resin is a rosin-based resin or a dicyclopentadiene-based DCPD resin.

[0009] Preferably, the carbon black is one or two of N115 carbon black, N220 carbon black, and N234 carbon black.

[0010] Preferably, the antioxidant is a combination of 6PPD and TMQ, and the accelerator is one or a combination of NS and CZ.

[0011] The aforementioned method for preparing a cut-resistant tread compound for wide-body vehicles is characterized by comprising the following steps:

[0012] S1 Low-Temperature Mixing

[0013] All styrene-butadiene rubber and natural rubber, some carbon black and some tear-resistant resin, all zinc oxide and antioxidant were put into a BB430 internal mixer and mixed for 120s to 130s. The rotor type was 6WI, the speed was 20 rpm to 30 rpm, and the discharge temperature was 130℃. After cooling, a first stage of masterbatch was obtained.

[0014] S2 two-stage low-temperature mixing

[0015] The first stage of masterbatch, the remaining carbon black, the tear-resistant resin, stearic acid and the protective wax from step S1 are put into a BB430 internal mixer with a 6WI rotor, a speed of 25 rpm, a discharge temperature of 130℃ and a mixing time of 80s to 90s; after cooling, the second stage of masterbatch is obtained.

[0016] S3 Final Refinement

[0017] The second-stage masterbatch, sulfur, and accelerator from step S2 are fed into a GK270 internal mixer at a speed of 20 rpm, a discharge temperature of 110°C, and a mixing time of 100-110 seconds. After cooling, a cut-resistant tread rubber for wide-body vehicles is obtained.

[0018] The cut-resistant tread compound for wide-body vehicles of this invention has a high styrene-butadiene rubber content and a large amount of tear-resistant resin, which greatly increases the cut resistance of the tread compound. The optimized mixing process of this invention reduces the speed of the internal mixer and significantly lowers the discharge temperature, achieving the following technical effects: all materials are uniformly dispersed, reducing the binding between styrene-butadiene rubber and carbon black, resulting in superior cut resistance of the compound, meeting the requirements for wide-body vehicles used in mining areas. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1

[0021] Styrene-butadiene rubber 80 parts, natural rubber 20 parts, N220 carbon black 57 parts, zinc oxide 4.5 parts, stearic acid 2 parts, protective wax 2 parts, antioxidant 3 parts, rosin resin and DCPD resin mixed together 9 parts, sulfur 1.5 parts, accelerator 1.5 parts.

[0022] The preparation steps are as follows:

[0023] S1 Low-Temperature Mixing

[0024] All styrene-butadiene rubber and natural rubber, some carbon black and some tear-resistant resin, all zinc oxide and antioxidant were put into a BB430 internal mixer and mixed for 120 s to 130 s. The rotor type was 6WI, the speed was 20 rpm to 30 rpm, and the discharge temperature was 130℃. After cooling, a first stage of masterbatch was obtained.

[0025] S2 two-stage low temperature mixing

[0026] The first stage of masterbatch, the remaining carbon black, the tear-resistant resin, stearic acid, and the protective wax from step S1 are put into a BB430 internal mixer with a 6WI rotor, a rotation speed of 25 rpm, and a discharge temperature of 130°C; after cooling, the second stage of masterbatch is obtained.

[0027] S3 Final Refinement

[0028] The second-stage masterbatch, sulfur, and accelerator from step S2 are fed into a GK270 internal mixer at a speed of 20 rpm and a discharge temperature of 110°C. After cooling, a cut-resistant tread compound for wide-body vehicles is obtained.

[0029] The tread compound prepared in this embodiment was tested using a cut resistance tester. The sample rotation speed was 720 rpm, the impact frequency was 120 times / min, the test time was 20 min, and the cut loss rate was 2.0%. Specific performance characteristics are as follows:

[0030]

[0031] Compared with rubber produced by high temperature mixing in an internal mixer, the low-temperature rubber mixing process of this invention significantly improves the elongation at break before aging and reduces the 300% fixed elongation.

[0032] Aging performance (key indicator): After thermo-oxidative aging (100℃×24h), the strength and elongation of the rubber compound remained good, and the tensile volume increased by 10.5% compared with the high-temperature treatment in the internal mixer. This indicates that low-temperature and low-shear processing reduces the formation of the binder, effectively improving the cut resistance of the finished tires and extending their service life.

[0033] Example 2

[0034] Styrene-butadiene rubber 100 parts, N115 carbon black 55 parts, zinc oxide 3 parts, stearic acid 2 parts, protective wax 3 parts, antioxidant 5 parts, dicyclopentadiene DCPD resin 6 parts, sulfur 0.8 parts, accelerator 1 part.

[0035] The preparation method is the same as in Example 1. The performance is as follows:

[0036]

[0037] Example 3

[0038] 90 parts styrene-butadiene rubber, 10 parts natural rubber, 57.5 parts N220 carbon black, 4 parts zinc oxide, 1.5 parts stearic acid, 2.5 parts protective wax, 4 parts antioxidant, 10 parts rosin resin and dicyclopentadiene DCPD resin, 1 part sulfur, and 1.3 parts accelerator.

[0039] The preparation method is the same as in Example 1. The performance is as follows:

[0040]

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cut-resistant tread compound for wide-body vehicles, characterized in that, By weight, it comprises the following components: 80-100 parts styrene-butadiene rubber, 0-20 parts natural rubber, 50-60 parts carbon black, 3-5 parts zinc oxide, 1-2 parts stearic acid, 2-3 parts protective wax, 3-5 parts antioxidant, 5-10 parts tear-resistant resin, 0.8-1.5 parts sulfur, and 1-2 parts accelerator.

2. The cut-resistant tread compound for wide-body vehicles according to claim 1, characterized in that: By weight, it includes 80 parts styrene-butadiene rubber, 20 parts natural rubber, 57 parts N220 carbon black, 4.5 parts zinc oxide, 2 parts stearic acid, 2 parts protective wax, 3 parts antioxidant, 9 parts tear-resistant resin, 1.5 parts sulfur, and 1.5 parts accelerator.

3. The cut-resistant tread compound for wide-body vehicles according to claim 1 or 2, characterized in that: The tear-resistant resin is a rosin-based resin or a dicyclopentadiene-based DCPD resin.

4. The cut-resistant tread compound for wide-body vehicles according to claim 1 or 2, characterized in that, The carbon black is one or two of N115 carbon black, N220 carbon black, and N234 carbon black.

5. The cut-resistant tread compound for wide-body vehicles according to claim 1 or 2, characterized in that, The antioxidant is a combination of 6PPD and TMQ, and the accelerator is one or both of NS and CZ.

6. The method for preparing the cut-resistant tread compound for wide-body vehicles as described in any one of claims 1-5, characterized in that, Includes the following steps: S1 Low-Temperature Mixing All styrene-butadiene rubber and natural rubber, some carbon black and some tear-resistant resin, all zinc oxide and antioxidant were put into a BB430 internal mixer and mixed for 120s to 130s. The rotor type was 6WI, the speed was 20 rpm to 30 rpm, and the discharge temperature was 130℃. After cooling, a first stage of masterbatch was obtained. S2 two-stage low-temperature mixing The first stage of masterbatch, the remaining carbon black, the tear-resistant resin, stearic acid and the protective wax from step S1 are put into a BB430 internal mixer with a 6WI rotor, a speed of 25 rpm, a discharge temperature of 130℃ and a mixing time of 80s to 90s; after cooling, the second stage of masterbatch is obtained. S3 Final Refinement The second-stage masterbatch, sulfur, and accelerator from step S2 are fed into a GK270 internal mixer at a speed of 20 rpm, a discharge temperature of 110°C, and a mixing time of 100-110 seconds. After cooling, a cut-resistant tread rubber for wide-body vehicles is obtained.

Images