Anti-skid tire tread rubber for mining

Abstract

The invention discloses a kind of anti-slip tire tread rubber for mining, and relates to the technical field of tread rubber. Its technical scheme is: by weight, it includes the following components: 100 parts of rubber component, 35-45 parts of carbon black, 20-30 parts of white carbon black, 4-6 parts of silane coupling agent, 6-10 parts of environmentally friendly aromatic oil, 3-5 parts of AT-KSH resin, 2-4 parts of WSR6100 resin, 4-6 parts of antioxidant, 1-2 parts of microcrystalline wax, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 1.2-1.6 parts of sulfur, 1.5-1.8 parts of accelerator and 0.1-0.2 parts of anti-scorch agent. The present invention solves the friction reduction and slipping phenomenon caused by slippery road surface of mining tires under adverse climatic conditions, especially in rainy and snowy seasons and climbing conditions, thereby solving the abnormal wear of tires due to slipping, improving the service life of tires, and improving the safety and operating efficiency during mining operations.

Description

Technical Field

[0001] The invention relates to the technical field of tread rubbers, and in particular to a tread rubber for a mining anti-skid tire. Background Art

[0002] Mining tires face unprecedented challenges in harsh climate and road conditions. These challenges are particularly prominent in rainy and snowy areas and complex climbing conditions. In these environments, the tire's anti-skid performance, wear resistance and durability have become key indicators to measure its performance. In rainy and snowy areas, the road surface is slippery and the friction between the tire and the ground is greatly reduced, which directly leads to the tire's easy slipping during driving.

[0003] This slipping phenomenon will not only increase tire wear and shorten tire service life, but may also cause a series of safety accidents. In mining operations, once a safety accident occurs, it will not only threaten the lives of operators, but may also cause equipment damage and affect production progress. Therefore, how to maintain good grip on slippery roads has become an important topic in the research and development of mining engineering tires.

[0004] In view of this problem, it is particularly urgent to develop a mining engineering tire tread compound with excellent anti-skid performance. 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 tread rubber for anti-skid tires for mining, so as to solve the problem of reduced friction and slipping of mining tires caused by slippery roads under adverse climatic conditions, especially in rainy and snowy seasons and climbing conditions, thereby solving the abnormal wear of tires due to slipping, increasing the service life of tires, and improving the safety and operating efficiency during mining operations.

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

[0007] The anti-skid tire tread rubber for mining includes the following components, measured in parts by weight: 100 parts of rubber component, 35-45 parts of carbon black, 20-30 parts of white carbon black, 4-6 parts of silane coupling agent, 6-10 parts of environmentally friendly aromatic oil, 3-5 parts of AT-KSH resin, 2-4 parts of WSR6100 resin, 4-6 parts of antioxidant, 1-2 parts of microcrystalline wax, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 1.2-1.6 parts of sulfur, 1.5-1.8 parts of accelerator and 0.1-0.2 parts of scorch retarder.

[0008] Preferably, the rubber component includes 0-20 parts of natural rubber and 80-100 parts of styrene-butadiene rubber.

[0009] Preferably, the carbon black is N220 carbon black or N234 carbon black.

[0010] Preferably, the white carbon black is precipitated white carbon black 175MP or 1165MP.

[0011] Preferably, the silane coupling agent is a silane mixture TESPT with an effective content of Si69 of 50%, and its dosage is one fifth of that of white carbon black.

[0012] Preferably, the antioxidant is ketoamine antioxidant RD and p-phenylenediamine antioxidant 4020.

[0013] Preferably, the accelerator is a sulfenamide accelerator NS.

[0014] Preferably, the anti-scorch agent is a highly active anti-scorch agent CTP.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] Compared with common mining tire tread rubber, the anti-slip performance of the mining tire tread rubber of the present invention is significantly improved. Through formula optimization, AT-KSH resin and WSR6100 resin are added to the tread rubber formula, which significantly improves the anti-slip performance of the tire. AT-KSH resin improves the wet grip performance by improving the viscoelasticity of the rubber and the compatibility with white carbon black; and the property of WSR6100 resin swelling when exposed to water increases the friction coefficient between the rubber and the wet road surface, reduces the contact angle between the tire and the ground, thereby improving the grip of the tire on the wet road surface, effectively solving the problem of tire slipping in the rainy and snowy season or when climbing, and enhancing driving safety and comfort. DETAILED DESCRIPTION

[0017] 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.

[0018] Examples 1-3 and Comparative Examples 1-3

[0019] The tread rubber formulas of mining tires of Examples 1-3 and Comparative Examples 1-3 are shown in Table 1:

[0020] Table 1 Tread rubber formulations of Examples 1-3 and Comparative Examples 1-3

[0021]

[0022]

[0023] The preparation method of the mining tire tread rubber of Examples 1-3 and Comparative Examples 1-3 comprises the following steps:

[0024] S1 one-stage mixing

[0025] 20# standard rubber, SBR1502 and carbon black N220 were put into an internal mixer and mixed for 30 seconds, then WSR6100 resin (Jiangsu Ruiba New Material Technology Co., Ltd.), microcrystalline wax, zinc oxide and stearic acid were added, and mixed at a speed of 38rpm. When the temperature of the rubber compound reached 120℃, it was lifted and pressed, and environmentally friendly aromatic oil was added at the same time. Subsequently, it was lifted and pressed every 30 seconds. When the temperature of the rubber compound reached 160℃, it was discharged and flaked. After cooling at room temperature for 4 hours, a masterbatch was obtained, and then it was subjected to two-stage mixing;

[0026] S2 two-stage mixing

[0027] The first-stage masterbatch of step S1, white carbon black 175MP, silane coupling agent TESPT, AT-KSH resin (Jiangsu Kaou Chemical Co., Ltd.), antioxidant 4020, and antioxidant RD were put into an internal mixer, mixed at a speed of 34 rpm, and the lumps were lifted and pressed every 30 seconds. When the temperature of the rubber material reached 154°C, the rubber was discharged and the sheets were dropped. After cooling at room temperature for 4 hours, the second-stage masterbatch was obtained, and then the masterbatch was subjected to final refining;

[0028] S3 Final Refining

[0029] The second-stage masterbatch of step S2, sulfur, accelerator NS and anti-scorch agent CTP are put into an internal mixer and mixed at a speed of 25 rpm. The blocks are lifted and pressed at intervals of 30 s, 30 s and 25 s respectively. After the mixing time reaches 120 s, the rubber is discharged and sliced. After being left to cool, the tread rubber for mining tires is obtained.

[0030] The mining tire tread rubbers prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to high temperature vulcanization to prepare test samples, which were then subjected to performance tests. The test results are shown in Table 2:

[0031] Table 2 Performance test results of mining engineering tire tread rubber prepared in Examples 1-3 and Comparative Examples 1-3

[0032] Physical property test items Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Shore hardness A / degree 61 62 62 64 64 63 10% tensile stress / MPa 0.56 0.55 0.61 0.67 0.58 0.66 100% tensile stress / MPa 2.52 2.17 2.30 2.62 2.56 2.61 Tensile strength / MPa 22.6 22.4 22.4 23.3 22.6 22.8 Elongation at break / % 580 577 581 545 550 583 Tensile product 13108 12925 13014 12699 12430 13292 Tan value (0℃) 0.331 0.311 0.302 0.266 0.285 0.287 Tan value (60℃) 0.182 0.181 0.179 0.175 0.177 0.175

[0033] Test sample vulcanization conditions: 147℃×60min; aging test conditions: 100℃×48h.

[0034] Comparing Example 1 with Comparative Example 1, it can be seen that when AT-KSH resin and WSR6100 resin are added to the tread rubber at the same time, the hardness and tensile stress of the rubber are reduced, and the tensile strength is slightly reduced; the elongation at break is slightly increased, and the tensile product is improved. This is mainly because the two added resin materials promote the dispersion of fillers on the one hand, and play a good lubricating role in the rubber molecular chain on the other hand, the mobility of the molecular chain is increased, which has a positive effect on improving the anti-wet skid performance of the tread rubber. At the same time, it can also be seen that compared with Comparative Example 1, the anti-wet skid performance (Tan value (0°C)) of the rubber material of Example 1 is improved by about 24%, and the anti-wet skid performance is significantly improved; the rolling resistance (Tan value (60°C)) increases by 4%, which is basically equivalent.

[0035] Comparing Example 1 with Comparative Examples 2-3, it can be seen that adding AT-KSH resin and WSR6100 resin to the rubber simultaneously has obvious advantages in terms of anti-slip performance compared with adding only one of them to the rubber.

[0036] Adding AT-KSH resin and WSR6100 resin to the tire tread rubber formula at the same time, their synergistic effect significantly improves the tire's anti-skid performance. AT-KSH resin is a specially modified styrene-based functional resin with branched isomerized active groups, which can improve the viscoelastic properties of the rubber, especially reducing elasticity and increasing viscosity in low-temperature areas, thereby enhancing wet grip performance. WSR6100 resin is a hydrogenated aromatic modified petroleum resin, containing rigid groups, and has good compatibility with rubber. It can move the glass transition temperature of the rubber toward high temperature, increase the 0℃ tanδ of the rubber, and improve the anti-skid performance of the rubber; at the same time, the property of swelling in water causes its functional polar groups to interact strongly with water molecules on the road surface, increasing the force of the rubber to pierce the water film, increasing the friction coefficient, reducing the contact angle between the tire and the ground, and increasing the wet contact area. At the same time, the synergistic use of the two resins improves the dispersibility of white carbon black, reduces the Payne effect, improves the contact between the rubber and the road surface, and enhances the anti-skid performance. In addition, they are well compatible in both low and high temperature areas, balancing the dynamic mechanical properties of the tread rubber. The improvement in the interface lubrication state reduces the surface friction caused by the rupture of the lubricant layer, further improving the anti-skid performance. Overall, the synergistic effect of AT-KSH resin and WSR6100 resin has achieved a significant improvement in the anti-skid performance of the tire through multiple factors such as improving dynamic mechanical properties, enhancing filler dispersion, adjusting microstructure and hardness, and enhancing interface effects. This improvement effect far exceeds the case of using one of the materials alone.

[0037] In the present invention, the combined use of AT-KSH resin and WSR6100 resin has a significant effect on improving the anti-skid performance of the tread rubber material, while not causing a significant increase in rolling resistance, which well solves the problem of insufficient anti-skid performance of mining tires when used on wet roads, and provides drivers with a safer and more comfortable driving experience.

Claims

1. Anti-skid tire tread rubber for mining, characterized in that: The invention comprises the following components in parts by weight: 100 parts of rubber component, 35-45 parts of carbon black, 20-30 parts of white carbon black, 4-6 parts of silane coupling agent, 6-10 parts of environmentally friendly aromatic oil, 3-5 parts of AT-KSH resin, 2-4 parts of WSR6100 resin, 4-6 parts of antioxidant, 1-2 parts of microcrystalline wax, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 1.2-1.6 parts of sulfur, 1.5-1.8 parts of accelerator and 0.1-0.2 parts of scorch retarder.

2. The anti-skid tire tread rubber for mining according to claim 1, characterized in that: The rubber component comprises 0-20 parts of natural rubber and 80-100 parts of styrene-butadiene rubber.

3. The anti-skid tire tread rubber for mining use according to claim 1, characterized in that: The carbon black is N220 carbon black or N234 carbon black.

4. The anti-skid tire tread rubber for mining according to claim 1, characterized in that: The white carbon black is white carbon black 175MP or 1165MP.

5. The anti-skid tire tread rubber for mining use according to claim 1, characterized in that: The silane coupling agent is a silane mixture TESPT with an effective content of Si69 of 50%, and its dosage is one fifth of that of white carbon black.

6. The anti-skid tire tread rubber for mining use according to claim 1, characterized in that: The antioxidants are ketoamine antioxidant RD and p-phenylenediamine antioxidant 4020.

7. The anti-skid tire tread rubber for mining use according to claim 1, characterized in that: The accelerator is a sulfonamide accelerator NS.

8. The anti-skid tire tread rubber for mining use according to claim 1, characterized in that: The anti-scorch agent is a highly active anti-scorch agent CTP.

Images