High-viscosity crack-resistant tire carcass rubber material

Abstract

The invention discloses a high-viscosity crack-resistant tire carcass rubber material, and relates to the technical field of tires. According to the technical scheme, the rubber composition is prepared from the following components in parts by weight: 100 parts of natural rubber, 46 to 53 parts of carbon black, 5 to 10 parts of white carbon black, 5 to 8 parts of zinc oxide, 2 to 3 parts of anti-aging agent, 2 to 3 parts of tackifying resin MK76, 0.1 to 0.2 part of peptizer, 10 to 13 parts of vulcanized resin RN-6080, 4 to 7 parts of insoluble sulfur, 2 to 3 parts of accelerant and 0.15 to 0.3 part of scorch retarder. According to the invention, the bonding performance of the tire body is obviously improved, the anti-cracking performance is enhanced, the problem of delamination of the tire caused by insufficient viscosity under severe working conditions of mines is reduced, and the service life of the tire is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of tires, and in particular to a high-viscosity and crack-resistant tire carcass rubber material. Background Art

[0002] In the mining market, construction machinery tires are key components whose performance directly affects the operating efficiency and safety of the equipment. However, current construction machinery tires generally have problems such as insufficient carcass viscosity and easy cracking, which is particularly prominent in the complex and changeable operating environment of mines.

[0003] During the operation of mining engineering tires, due to the heavy load, the tire body is constantly deformed and reciprocating. If the tire body viscosity is insufficient, it is easy to cause the tire body layers to separate, which in turn affects the overall structural strength and stability of the tire. The mining operating environment is harsh, and the tires often come into contact with sharp stones, ores and other objects, which can easily cause cracks. At the same time, the heat accumulated inside the tire body is difficult to dissipate, causing the tire body to be in a high temperature state for a long time, further aggravating the aging of the rubber and the tendency to crack. During the operation of mining engineering tires, a large amount of heat will be generated inside the tire body due to friction, compression and other factors. If the heat cannot be effectively dissipated, the tire body temperature will rise and the rubber performance will decrease, which will affect the tire's viscosity and crack resistance.

[0004] The service life of mining engineering machinery tires is seriously affected by the problems of insufficient carcass viscosity and easy cracking. Frequent tire replacement not only increases operating costs, but also affects the normal operation and production efficiency of equipment. In addition, tire failure may also cause safety accidents and pose a threat to personnel and equipment. Therefore, improving the viscosity and crack resistance of carcass rubber is not only a technical improvement for mining engineering machinery tires, but also an important measure to improve the overall level of the industry and ensure safe production. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a high-viscosity and crack-resistant tire carcass rubber material, thereby significantly improving the tire carcass bonding performance and enhancing the crack resistance performance, reducing the delamination problem caused by insufficient viscosity of the tire under harsh working conditions in mines, and extending the service life of the tire.

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

[0007] The high-viscosity and crack-resistant tire carcass rubber material comprises the following components, measured in parts by weight: 100 parts of natural rubber, 46-53 parts of carbon black, 5-10 parts of white carbon black, 5-8 parts of zinc oxide, 2-3 parts of antioxidant, 2-3 parts of tackifying resin MK76, 0.1-0.2 parts of peptizer, 10-13 parts of vulcanized resin RN-6080, 4-7 parts of insoluble sulfur, 2-3 parts of accelerator, and 0.15-0.3 parts of scorch retarder.

[0008] Among them, the tackifying resin MK76 is provided by Shanghai Qixiang New Material Technology Co., Ltd.; the vulcanized resin RN-6080 is provided by Jiangsu Ruiba New Material Technology Co., Ltd.

[0009] Preferably, the natural rubber is RSS3# smoked rubber imported from Thailand.

[0010] Preferably, the carbon black is N220 carbon black or N326 carbon black; and the white carbon black is HM6175.

[0011] Preferably, the antioxidant is p-phenylenediamine antioxidant 4020 and ketoamine antioxidant RD.

[0012] Preferably, the peptizer is peptizer SJ-103.

[0013] Preferably, the insoluble sulfur is OT10 or OT20.

[0014] Preferably, the accelerator is a sulfenamide accelerator DZ and a hexamethylenetetramine accelerator HMT.

[0015] Preferably, the anti-scorch agent is anti-scorch agent CTP.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Compared with the prior art, the high-viscosity and crack-resistant tire carcass rubber compound of the present invention achieves a significant improvement in tire carcass adhesion and crack-resistant performance. It not only reduces the delamination problem caused by insufficient viscosity of the tire under harsh working conditions in mines, but also effectively reduces early damage caused by crack expansion, thereby significantly extending the service life of the tire, reducing maintenance costs and reducing downtime caused by tire failure. In addition, the improvement of this carcass rubber compound also improves the stability and safety of engineering machinery under complex road conditions, thereby improving operating efficiency and ensuring the continuity and reliability of mining operations. DETAILED DESCRIPTION

[0018] In order to enable persons skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0019] Examples 1-3 and Comparative Examples 1-3

[0020] The tire carcass rubber compound formulations of Examples 1-3 and Comparative Examples 1-3 are shown in Table 1:

[0021] Table 1 Tire carcass rubber compound formula of Examples 1-3 and Comparative Examples 1-3

[0022]

[0023]

[0024] The method for preparing the engineering machinery tire carcass rubber material of Examples 1-3 and Comparative Examples 1-3 comprises the following steps:

[0025] S1 one-stage mixing

[0026] RSS3# tobacco sheet rubber and plasticizer SJ-103 were put into an internal mixer for plasticizing to obtain plasticized tobacco sheet rubber, and then the plasticized tobacco sheet rubber, 40 parts of carbon black and all white carbon black were put into the internal mixer for mixing for 35 seconds, and then tackifying resin MK76 and zinc oxide were added, and the mixing was carried out at a speed of 38rpm, and the lump was lifted and pressed every 30 seconds. When the temperature of the rubber material reached 155°C, the rubber was discharged and the sheet was placed at room temperature for more than 4 hours to obtain a first-stage masterbatch after cooling, and then the masterbatch was subjected to second-stage mixing;

[0027] S2 two-stage mixing

[0028] The first masterbatch of step S1 and the remaining carbon black, vulcanized resin RN-6080, antioxidant RD, and antioxidant 4020 are simultaneously put into an internal mixer, mixed at a speed of 35 rpm, and the lump is lifted and pressed every 30 seconds. When the temperature of the rubber material reaches 150°C, the rubber is discharged and the sheets are dropped. The rubber is placed at room temperature for more than 4 hours to obtain a cooled second masterbatch. The second masterbatch is then returned to the mixer and placed for 4 hours to cool, and then subjected to final refining.

[0029] S3 Final Refining

[0030] The second-stage masterbatch of step S2, insoluble sulfur, accelerator DZ, accelerator HMT and anti-scorch agent CTP are put into an internal mixer and mixed at a speed of 28 rpm. The mixture is lifted and pressed at intervals of 30 s, 25 s and 25 s respectively. When the temperature of the rubber material reaches 100°C, the rubber material is discharged and sliced. After being left to cool, the tire carcass rubber material for engineering machinery tire is obtained.

[0031] The engineering machinery tire carcass rubber materials of Examples 1-3 and Comparative Examples 1-3 were vulcanized at 145° C.×60 min to prepare test samples, which were then tested for physical properties. The test results are shown in Table 2:

[0032] Table 2 Physical property test results of engineering machinery tire carcass rubber materials of Examples 1-3 and Comparative Examples 1-3

[0033]

[0034]

[0035] Among them, the test conditions of static high temperature slow tearing tear energy are: test speed: 50mm / min, test temperature: 100℃.

[0036] By comparing Example 1 with Comparative Example 1, it can be seen that by adding octylphenol vulcanized resin RN-6080 and tackifying resin MK76 to the carcass rubber compound at the same time, the tensile stress of the vulcanized rubber is improved, the tensile strength does not change much, the elongation at break is slightly decreased, the hardness is reduced, the static high-temperature slow tearing tear energy of the rubber compound is improved by about 25%, the crack growth resistance is improved by about 26%, and the tear and crack resistance of the rubber compound are significantly improved; the aging retention rate is increased by about 16%, the steel wire extraction force is increased by about 12%, and the viscosity of the rubber compound is significantly improved during long-term use.

[0037] Comparing Example 1 with Comparative Examples 2-3, it can be seen that the addition of octylphenol vulcanized resin RN-6080 and tackifying resin MK76 to the carcass rubber material at the same time significantly improves the performance of adding only one of them to the rubber material. However, it can be seen from Comparative Examples 1-3 that the rubber material with only one of the materials improves some properties while reducing other properties and cannot meet the product use requirements.

[0038] Octylphenol vulcanized resin RN-6080 is a heat-reactive resin containing hydroxymethyl active groups. It is suitable for a variety of rubbers, including butyl rubber, EPDM rubber, nitrile rubber, etc. The cross-linking network is formed by the reaction of the vulcanizer with the phenolic group in the tackifying resin MK76, which improves the anti-destruction ability of the rubber. This cross-linking network increases the interaction between the rubber molecular chains, hinders the free movement of the rubber molecules, thereby increasing the viscosity and making the rubber more viscous; at the same time, it can also reduce the Mooney viscosity of the rubber, improve the self-adhesiveness of the rubber, and improve the physical and mechanical properties and thermal aging properties of the rubber. Tackifying resin MK76 is a modified non-self-curing phenolic adhesive resin used to promote the adhesion of rubber and skeleton materials (such as steel wire, fiber, etc.). It reacts with methylene donors to generate thermosetting resins, which can significantly improve the adhesion of rubber to various steel wires and fiber cords; at the same time, the resin contains functional groups such as phenolic hydroxyl and hydroxymethyl, which are easy to form a hydrogen bond network structure with rubber, which can further increase the viscosity of the rubber.

[0039] In addition, the hydrocarbon functional groups in the chemical components of octylphenol vulcanized resin RN-6080 can effectively improve the tear resistance and flex crack resistance of non-polar rubber, and have a significant effect on enhancing the crack resistance of rubber. The application of tackifying resin MK76 can improve the processing performance of rubber and help to evenly disperse the rubber material.

[0040] When octylphenol vulcanized resin RN-6080 and tackifying resin MK76 are used at the same time, they form a complex cross-linked network, which not only enhances the cohesion of the rubber, but also improves the adhesion between the rubber and the skeleton material. This synergistic effect significantly improves the tear and crack resistance of the rubber. In addition, the addition of the two resins also improves the aging retention rate and wire extraction force of the rubber, and the viscosity of the rubber has been significantly improved during long-term use. In contrast, although the single addition of octylphenol vulcanized resin RN-6080 improves the hardness and mechanical strength of the rubber, the improvement of viscosity and crack resistance is limited; and the single addition of tackifying resin MK76, although it improves the adhesive performance of the rubber, it is insufficient to improve the overall mechanical properties. Therefore, adding these two resins at the same time can make full use of their cohesion and adhesion enhancement effects to comprehensively improve the performance of the rubber.

[0041] In summary, the present invention simultaneously adds octylphenol vulcanized resin RN-6080 and tackifying resin MK76, which not only play their respective positive roles, but also play a synergistic role, making up for the shortcomings of a single material, thereby significantly improving the adhesion and crack resistance of the rubber material, thereby achieving the purpose of improving comprehensive performance.

Claims

1. Highly viscous and crack-resistant tire carcass rubber, characterized in that: The invention comprises the following components in parts by weight: 100 parts of natural rubber, 46-53 parts of carbon black, 5-10 parts of white carbon black, 5-8 parts of zinc oxide, 2-3 parts of antioxidant, 2-3 parts of tackifying resin MK76, 0.1-0.2 parts of peptizer, 10-13 parts of vulcanizing resin RN-6080, 4-7 parts of insoluble sulfur, 2-3 parts of accelerator and 0.15-0.3 parts of scorch retarder.

2. The high-viscosity, crack-resistant tire carcass rubber material according to claim 1, characterized in that: The natural rubber is smoked sheet rubber RSS3#.

3. The high-viscosity, crack-resistant tire carcass rubber material according to claim 1, characterized in that: The carbon black is N220 carbon black or N326 carbon black; the white carbon black is HM6175.

4. The high-viscosity, crack-resistant tire carcass rubber material according to claim 1, characterized in that: The antioxidants are antioxidant 4020 and antioxidant RD.

5. The high-viscosity, crack-resistant tire carcass rubber material according to claim 1, characterized in that: The peptizer is peptizer SJ-103.

6. The high-viscosity, crack-resistant tire carcass rubber material according to claim 1, characterized in that: The insoluble sulfur is OT10 or OT20.

7. The high-viscosity, crack-resistant tire carcass rubber material according to claim 1, characterized in that: The accelerators are accelerator DZ and accelerator HMT.

8. The high-viscosity, crack-resistant tire carcass rubber material according to claim 1, characterized in that: The anti-scorching agent is anti-scorching agent CTP.

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