A full styrene-butadiene rubber tread composition for hard mining areas and a mixing process thereof and a mining tire

Abstract

The present invention relates to an engineering tire, in particular to a full styrene-butadiene rubber tread composition for hard mining areas and a mixing process thereof and a mining tire, comprising the following components in parts by weight: 100 parts of styrene-butadiene rubber; 59-66 parts of reinforcing agent; 3-6 parts of zinc oxide; 1.5-3 parts of stearic acid; 3-6 parts of antioxidant; 2-5 parts of tackifier; 5-10 parts of oil; 0-2 parts of tear-resistant resin; 1-1.5 parts of vulcanizing agent; 1.2-2.5 parts of mixing accelerator; 0.1-0.4 parts of scorch retarder. Compared with the prior art, the present invention solves the defects of short tread life, poor cutting resistance, flower collapse, high heat generation, etc. of mining tires in the prior art. The present solution realizes mining tires with full styrene-butadiene rubber as the raw rubber system, ensuring its cutting resistance, flower collapse resistance and low heat generation.

Description

Technical Field

[0001] The invention relates to an engineering tire, in particular to a full styrene-butadiene rubber tread composition used in hard mining areas and a mixing process thereof and a mining tire. Background Art

[0002] Mining tires are used in harsh conditions, especially in quarries, iron mines, copper mines, etc., where the hardness of the rocks is high. Due to harsh road conditions, heavy vehicle loads, and continuous operations, the tires generate a lot of heat during operation, which makes it easy for the tread to be cut and gnawed, and it is also easy to produce crown and shoulder voids.

[0003] Therefore, when designing the formula for hard mineral treads, it is necessary to comprehensively consider the raw rubber system, reinforcement system, and vulcanization system to minimize heat generation while ensuring the tread's resistance to cutting and chipping.

[0004] CN200710050528.X discloses a rubber material for the tread of a mining tire, wherein the raw materials in the rubber material include: natural rubber, dispersant FS-200, active zinc oxide, stearic acid, rubber protective wax, N-phenyl-N'-isopropyl p-phenylenediamine, 2, 2, 4-trimethyl-1, 2-dihydroquinoline polymer, acetone-diphenylamine high temperature condensate, N220 carbon black, white carbon black, bis(triethoxypropyl)silane tetrasulfide, aromatic oil, N-tert-butyl-2-benzothiazolylsulfonamide, oil-extended sulfur powder (S), and N-cyclohexylthiophthalimide. The white carbon black and bis(triethoxypropyl)silane tetrasulfide are added to rubber (natural rubber) and chemical materials to improve the cutting resistance, puncture resistance, chipping resistance and durability of the tread of the mining tire, thereby improving the service life of the mining tire. This patent uses a natural rubber system, which can meet the use requirements of general soft mines (such as coal mines, etc.), but for metal hard ores (such as iron ore, copper, gold mines, etc.), its puncture resistance and cutting resistance cannot meet the use requirements, so its service life in metal hard mine scenarios is very short.

[0005] CN202410637502.9 discloses a cut-resistant, low-heat mining tire tread rubber and its preparation method, and a mining tire. The tire tread rubber includes the following components by weight: 0-70 parts of natural rubber, 30-100 parts of styrene-butadiene rubber, 0-30 parts of reclaimed rubber, 10-65 parts of carbon black, 0-45 parts of white carbon black, 3-4 parts of zinc oxide, 1-1.5 parts of stearic acid, 1-2 parts of microcrystalline wax, 2-4 parts of antioxidant, 2-14 parts of softener, 0-3.2 parts of silane coupling agent, 1.4-1.8 parts of sulfur, and 0.5-2.3 parts of accelerator. This patent uses a mixture of natural rubber and styrene-butadiene rubber as the raw rubber system, and its cut resistance is weaker than that of the full styrene-butadiene rubber system. At the same time, a large amount of white carbon black and coupling agent are used, which increases the processing difficulty and poor component stability.

[0006] It can be seen that although the prior art has proposed tread rubbers for coping with the harsh operating environment of mining tires, their performance is still not enough to achieve the expected effect to effectively extend the service life. Therefore, it is still necessary to improve the treads of existing mining tires. Summary of the invention

[0007] The purpose of the present invention is to solve at least one of the above problems and to provide a full styrene-butadiene rubber tread composition and its mixing process and a mining tire for hard mining areas, so as to solve the defects of the mining tires in the prior art such as short tread life, low cut resistance, chipping, high heat generation, etc. The present scheme realizes the mining tire with full styrene-butadiene rubber as the raw rubber system, ensuring its cut resistance, chipping resistance and low heat generation.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] The first aspect of the present invention discloses a full styrene-butadiene rubber tread composition for hard mining areas, comprising the following components in parts by weight:

[0010] 100 parts of styrene-butadiene rubber;

[0011] Reinforcing agent 59-66 parts;

[0012] 3-6 parts of zinc oxide;

[0013] 1.5-3 parts of stearic acid;

[0014] 3-6 parts of antioxidant;

[0015] 2-5 parts of tackifier;

[0016] Tear-resistant resin 0-2 parts;

[0017] Oil 5-10 parts;

[0018] 1-1.5 parts of vulcanizing agent;

[0019] Mixing accelerator 1.2-2.5 parts;

[0020] Anti-scorch agent 0.1-0.4 parts.

[0021] Preferably, the all-styrene-butadiene rubber tread composition includes 2 parts of tear-resistant resin.

[0022] Preferably, the tear-resistant resin is KPE-F6115 resin.

[0023] Preferably, the reinforcing agent comprises 50-57 parts of carbon black and 5-15 parts of white carbon black.

[0024] Preferably, the carbon black comprises 2 series carbon black with low structure.

[0025] Preferably, the carbon black comprises N219.

[0026] Preferably, the mixed accelerator comprises 0.5-1.5 parts of accelerator NS, 0.5-1.0 parts of accelerator DM and 0.1-0.3 parts of accelerator D.

[0027] Preferably, the antioxidant comprises 1.5-2.5 parts of antioxidant 6PPD (antioxidant 4020), 0.5-1.5 parts of antioxidant RD and 1-2 parts of protective wax.

[0028] Preferably, the protective wax includes high-temperature protective wax (a type of rubber protective wax).

[0029] Preferably, the styrene butadiene rubber is latex styrene butadiene rubber (rubber), specifically SBR1502. In this solution, a high fraction (≥50 parts) of latex styrene butadiene rubber is used as the main ingredient in the composition formula, which can fully utilize the characteristics of its molecular structure and is conducive to improving the cut resistance of the tread made from the composition formula.

[0030] Preferably, the tackifier is a tackifying resin, including 204 resin.

[0031] Preferably, the oil comprises paraffin oil.

[0032] Preferably, the vulcanizing agent comprises ordinary sulfur.

[0033] Preferably, the anti-scorch agent includes anti-scorch agent CTP.

[0034] Preferably, the all-styrene-butadiene rubber countertop composition comprises the following components in parts by weight:

[0035] Styrene butadiene rubber SBR1502 100 parts;

[0036] N219 for 50 copies;

[0037] 9 parts of white carbon black;

[0038] 4 parts of zinc oxide;

[0039] 2 parts of KPE-F6115 resin;

[0040] 2 parts of stearic acid;

[0041] Antiaging agent 4020 1.5 parts;

[0042] Antiaging agent RD 1.3 parts;

[0043] 2 parts of protective wax;

[0044] 204 resin 3 parts;

[0045] 10 parts of paraffin oil;

[0046] 1.5 parts of sulfur;

[0047] Accelerator NS 1 part;

[0048] Accelerator DM 0.7 parts;

[0049] Accelerator D 0.15 parts;

[0050] Anti-scorch agent CTP 0.4 parts.

[0051] The second aspect of the present invention discloses a refining process of the all-styrene-butadiene rubber tread composition for hard mining areas as described above, comprising the following steps:

[0052] S1: first stage mixing: adding styrene-butadiene rubber, antioxidant, zinc oxide, stearic acid, resin (including tear-resistant resin and tackifier), pressing and holding for a certain period of time, adding part of reinforcing agent after lifting, pressing and mixing to the first target temperature, adding oil after lifting, pressing and mixing to the second target temperature, pressing and mixing to the third target temperature after lifting, and then discharging the rubber to obtain a first stage mixed rubber;

[0053] S2: second stage mixing: adding the first stage mixed rubber and the remaining part of the reinforcing agent, pressing and mixing for a certain period of time, lifting the support, and pressing and mixing again to the fourth target temperature to obtain the second stage mixed rubber;

[0054] S3: the third mixing stage: adding the second-stage mixed rubber and the vulcanizing agent, the mixing accelerator, and the anti-scorching agent, pressing the ball for a certain period of time and then lifting the support, pressing the ball for a certain period of time and then lifting the support, pressing the ball again to mix to the fifth target temperature and discharge the rubber to obtain a full styrene-butadiene rubber tread;

[0055] Among them, antioxidants, zinc oxide, stearic acid, and resins can be collectively referred to as compounding agents; vulcanizing agents, mixing accelerators, and scorch retardants can be collectively referred to as final refining fines.

[0056] Preferably, the method comprises the following steps:

[0057] S1: The first stage of mixing: add styrene-butadiene rubber, antioxidant, zinc oxide, stearic acid, resin (including tear-resistant resin and tackifier), press and hold for 20-25 seconds, add part of reinforcing agent after lifting, press and mix to 120-125℃, add oil after lifting, press and mix to 140-145℃, press and mix to 155-160℃ after lifting, and then discharge the rubber to obtain a first-stage mixed rubber;

[0058] S2: Second stage mixing: add the first stage mixed rubber and the remaining part of the reinforcing agent, press and mix for 30-35 seconds, then lift the support, press and mix again to 150-155°C to obtain the second stage mixed rubber;

[0059] S3: The third mixing stage: add the second-stage mixed rubber and vulcanizer, mixing accelerator, and scorch retarder, press the ball and hold it for 30-40 seconds, then lift it up, press the ball and hold it for 25-35 seconds, then lift it up, press the ball and mix it again to 110-115℃ to discharge the rubber, and obtain a full styrene-butadiene rubber tread.

[0060] The third aspect of the present invention discloses a mining tire, wherein the tread of the mining tire is prepared by refining any of the above-mentioned all-styrene-butadiene rubber tread compositions.

[0061] Compared with the prior art, the present invention has the following beneficial effects:

[0062] (1) The raw rubber system adopts all-styrene-butadiene rubber. The benzene ring structure and branched chain in the styrene-butadiene rubber molecule ensure the cut resistance under hard mineral conditions. Compared with the conventional all-natural rubber tread (such as CN200710050528.X), due to the properties of all-styrene-butadiene rubber itself and its combination with specific multiple compounding agents and final refined fine materials, the service life of the tread obtained by this formula can reach more than 1 times that of the existing technology.

[0063] (2) The reinforcement system uses N219 and white carbon black. Compared with N234 and N220 carbon black, N219 has a lower structure and can provide the formula composition with higher strength-elongation product, tear strength and lower heat generation. The use of some white carbon black can improve the anti-chipping performance.

[0064] (3) Resin KPE-F6115 is synthesized from cyclopentadiene DCPD and phenol. After addition, it can significantly increase the hardness, reduce the strain stress, and at the same time increase the elongation, thereby improving the cut resistance and chipping resistance of the formula.

[0065] (4) Use a system of multiple accelerators to improve vulcanization efficiency and reduce heat generation. DETAILED DESCRIPTION

[0066] The present invention is described in detail below with reference to specific embodiments, but this is by no means a limitation of the present invention.

[0067] In the following description, unless otherwise specified, the reagents used may be conventional commercially available products, and the methods used may be those known in the art.

[0068] A full styrene-butadiene rubber tread composition for hard mining areas, comprising the following components in parts by weight:

[0069] 100 parts of styrene-butadiene rubber;

[0070] Reinforcing agent 59-66 parts;

[0071] 3-6 parts of zinc oxide;

[0072] 1.5-3 parts of stearic acid;

[0073] 3-6 parts of antioxidant;

[0074] 2-5 parts of tackifier;

[0075] Tear-resistant resin 0-2 parts;

[0076] Oil 5-10 parts;

[0077] 1-1.5 parts of vulcanizing agent;

[0078] Mixing accelerator 1.2-2.5 parts;

[0079] Anti-scorch agent 0.1-0.4 parts.

[0080] Preferably, the all-styrene-butadiene rubber tread composition includes 2 parts of tear-resistant resin.

[0081] Preferably, the tear-resistant resin is KPE-F6115 resin.

[0082] Preferably, the reinforcing agent comprises 50-57 parts of carbon black and 5-15 parts of white carbon black.

[0083] Preferably, the carbon black comprises 2 series carbon black with low structure.

[0084] Preferably, the carbon black comprises N219.

[0085] Preferably, the mixed accelerator comprises 0.5-1.5 parts of accelerator NS, 0.5-1.0 parts of accelerator DM and 0.1-0.3 parts of accelerator D.

[0086] Preferably, the antioxidant comprises 1.5-2.5 parts of antioxidant 6PPD (antioxidant 4020), 0.5-1.5 parts of antioxidant RD and 1-2 parts of protective wax.

[0087] The protective wax is a high-temperature protective wax.

[0088] Preferably, the styrene butadiene rubber is latex styrene butadiene (rubber) rubber, specifically SBR1502.

[0089] The tackifier is a tackifying resin, specifically 204 resin.

[0090] The oil is paraffin oil.

[0091] The vulcanizing agent is common sulfur.

[0092] The anti-scorch agent is anti-scorch agent CTP.

[0093] Preferably, the all-styrene-butadiene rubber countertop composition comprises the following components in parts by weight:

[0094] Styrene butadiene rubber SBR1502 100 parts;

[0095] N219 for 50 copies;

[0096] 9 parts of white carbon black;

[0097] 4 parts of zinc oxide;

[0098] 2 parts of KPE-F6115 resin;

[0099] 2 parts of stearic acid;

[0100] Antiaging agent 4020 1.5 parts;

[0101] Antiaging agent RD 1.3 parts;

[0102] 2 parts of protective wax;

[0103] 204 resin 3 parts;

[0104] 10 parts of paraffin oil;

[0105] 1.5 parts of sulfur;

[0106] Accelerator NS 1 part;

[0107] Accelerator DM 0.7 parts;

[0108] Accelerator D 0.15 parts;

[0109] Anti-scorch agent CTP 0.4 parts.

[0110] A refining process for the all-styrene-butadiene rubber tread composition for hard mining areas as described above comprises the following steps:

[0111] S1: The first stage of mixing: After adding styrene-butadiene rubber and compounding agent, press the ball and keep it for 20-25s. After lifting, add part of reinforcing agent and press and mix to 120-125℃. After lifting, add oil and press and mix to 140-145℃. After lifting, press and mix to 155-160℃ and then discharge the rubber to obtain a first-stage mixed rubber.

[0112] S2: Second stage mixing: add the first stage mixed rubber and the remaining part of the reinforcing agent, press and mix for 30-35 seconds, then lift the support, press and mix again to 150-155°C to obtain the second stage mixed rubber;

[0113] S3: The third mixing stage: add the second-stage mixed rubber and the final refined fine material, press the ball and hold it for 30-40 seconds, then lift it, press the ball and hold it for 25-35 seconds, then lift it, press the ball and mix it again until the temperature reaches 110-115℃ and discharge the rubber to obtain a full styrene-butadiene rubber tread;

[0114] The compounding agent comprises an antioxidant, zinc oxide, stearic acid, a tackifier and an anti-tear resin;

[0115] The final refined fine material comprises a vulcanizing agent, a mixing accelerator and a scorch retarder.

[0116] The all-styrene-butadiene rubber tread composition for hard mining areas as described above is used as the tread of mining tires after being refined.

[0117] The following Table 1 shows the formulations of the tread compositions of Examples 1-3 and Comparative Examples 1 and 2.

[0118] Table 1 Formulas of tread compositions of Examples 1-3 and Comparative Examples 1 and 2

[0119]

[0120] The tread composition formulations of Examples 1-3 and Comparative Examples 1 and 2 are mixed by the following specific process:

[0121] S1: The first stage of mixing: After adding styrene-butadiene rubber and compounding agent, press the ball and keep it for 20-25s. After lifting, add part of reinforcing agent and press and mix to 120-125℃. After lifting, add oil and press and mix to 140-145℃. After lifting, press and mix to 155-160℃ and then discharge the rubber to obtain a first-stage mixed rubber.

[0122] S2: Second stage mixing: add the first stage mixed rubber and the remaining part of the reinforcing agent, press and mix for 30-35 seconds, then lift the support, press and mix again to 150-155°C to obtain the second stage mixed rubber;

[0123] S3: The third mixing stage: add the second-stage mixed rubber and the final refined fine material, press the ball and hold it for 30-40 seconds, then lift it up, press the ball and hold it for 25-35 seconds, then lift it up, press the ball and mix it again until the temperature reaches 110-115℃ to discharge the rubber, and obtain a full styrene-butadiene rubber tread.

[0124] The performance tests were conducted on the treads prepared from the tread compositions of Examples 1-3 and Comparative Examples 1 and 2. The results are shown in Table 2.

[0125] in,

[0126] Tensile properties test of specimens: GB / T 528-2009;

[0127] Tear performance test of the sample: tear strength, GB / T 529-2008;

[0128] Fatigue temperature rise performance test of the sample: Compression heat generation (final fatigue temperature rise), according to GB / T 1687.3-2016: temperature 55°C, frequency 30Hz, stroke 4.45mm, time 25min;

[0129] Sample VMI abrasion test: GB / T 40797-2021;

[0130] Sample cutting amount test: The test uses RCC-1 testing machine, with a speed of 725 rpm, a striking frequency of 2 Hz, and a test interval of 30 minutes;

[0131] Sample rebound performance test: refer to ISO 4662-2017;

[0132] Sample hardness test: GB / T 531.1-2008.

[0133] Table 2 Performance test of the treads mixed with the tread compositions of Examples 1-3 and Comparative Examples 1 and 2

[0134]

[0135] Combining Table 1 and Table 2, we can see that:

[0136] 1. From the analysis of the data of Example 1 and Comparative Example 1 and Comparative Example 2, it is known that by using N219 carbon black and optimizing the vulcanization system, the strength-elongation product (the product of tensile strength and elongation at break), cutting volume, and compression heat generation of the formula are significantly improved.

[0137] 2. From the analysis of the data of Examples 1, 2, and 3, it is known that when KPE-F6115 resin is added, the 50% modulus and Shore hardness of the formula are increased, the 300% modulus is reduced, and the elongation at break is increased; while the cutting amount is reduced, the compression heat generation is also increased. Therefore, the amount of KPE-F6115 resin (mainly corresponding to the change in cutting amount) and carbon black (mainly corresponding to the change in compression heat generation) can be adjusted according to the actual situation to meet the use requirements.

[0138] 3. The tire tread mixed according to the embodiment formulation was road tested on a 16.00R25 E4 pattern. The test mining area was a copper mine in southern my country. The service life was increased by about 1000 hours compared with the comparative formulation.

[0139] 4. The present invention uses high-fraction emulsion polystyrene butadiene rubber, low-structure 2 series carbon black, new KPE-F6115 resin and multiple accelerators to achieve high cut resistance and chipping resistance of the tread formula, while reducing heat generation to meet the harsh use conditions of hard minerals.

[0140] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A full styrene-butadiene rubber tread composition for hard mining areas, characterized in that: The composition comprises the following components in parts by weight: 100 parts of styrene-butadiene rubber; Reinforcing agent 59-66 parts; 3-6 parts of zinc oxide; 1.5-3 parts of stearic acid; 3-6 parts of antioxidant; 2-5 parts of tackifier; Tear-resistant resin 0-2 parts; Oil 5-10 parts; 1-1.5 parts of vulcanizing agent; Mixing accelerator 1.2-2.5 parts; Anti-scorch agent 0.1-0.4 parts; The tear-resistant resin is KPE-F6115 resin; The reinforcing agent is 50-57 parts of carbon black and 5-15 parts of white carbon black, wherein the carbon black is low-structure 2 series carbon black N219 The mixed accelerator is 0.5-1.5 parts of accelerator NS, 0.5-1.0 parts of accelerator DM and 0.1-0.3 parts of accelerator D.

2. The all-styrene-butadiene rubber tread composition for hard mining areas according to claim 1, characterized in that: The all-styrene-butadiene rubber tread composition comprises 2 portions of tear-resistant resin.

3. A refining process for the all-styrene-butadiene rubber tread composition for hard mining areas as claimed in claim 1 or 2, characterized in that: The steps include: S1: first stage mixing: adding styrene-butadiene rubber and compounding agent, pressing the mixture into a ball, adding part of reinforcing agent after lifting, pressing and mixing the mixture to the first target temperature, adding oil after lifting, pressing and mixing the mixture to the second target temperature, pressing and mixing the mixture to the third target temperature after lifting, and then discharging the rubber to obtain a first stage mixed rubber; S2: second stage mixing: adding the first stage mixed rubber and the remaining part of the reinforcing agent, pressing and mixing, lifting, pressing and mixing again to the fourth target temperature, and obtaining the second stage mixed rubber; S3: the third mixing stage: adding the second-stage mixed rubber and the final refined fine material, pressing the ball and then lifting the support, pressing the ball again and then lifting the support, pressing the ball again and mixing to the fifth target temperature to discharge the rubber, and obtaining a full styrene-butadiene rubber tread; The compounding agent comprises an antioxidant, zinc oxide, stearic acid, a tackifier and an anti-tear resin; The final refined fine material comprises a vulcanizing agent, a mixing accelerator and a scorch retarder.

4. The refining process of the full styrene-butadiene rubber tread composition for hard mining areas according to claim 3, characterized in that: The steps include: S1: The first stage of mixing: After adding styrene-butadiene rubber and compounding agent, press the ball and keep it for 20-25s. After lifting, add part of reinforcing agent and press and mix to 120-125℃. After lifting, add oil and press and mix to 140-145℃. After lifting, press and mix to 155-160℃ and then discharge the rubber to obtain a first-stage mixed rubber. S2: Second stage mixing: add the first stage mixed rubber and the remaining part of the reinforcing agent, press and mix for 30-35 seconds, then lift the support, press and mix again to 150-155°C to obtain the second stage mixed rubber; S3: The third mixing stage: add the second-stage mixed rubber and the final refined fine material, press the ball and hold it for 30-40 seconds, then lift it up, press the ball and hold it for 25-35 seconds, then lift it up, press the ball and mix it again until the temperature reaches 110-115℃ to discharge the rubber, and obtain a full styrene-butadiene rubber tread.

5. A mining tire, characterized in that: The all-styrene-butadiene rubber tread composition as claimed in claim 1 or 2 is refined and used as the tread of the mining tire.

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