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CN-121991418-A - Low-hysteresis high-durability tire ply rubber composition, mixing method and tire

CN121991418ACN 121991418 ACN121991418 ACN 121991418ACN-121991418-A

Abstract

The invention relates to the technical field of tire manufacturing, in particular to a low-hysteresis high-durability tire ply rubber composition, a mixing method and a tire. The rubber comprises, by weight, 100 parts of a rubber component, natural rubber, first and second oil-free solution polymerized styrene-butadiene rubber (BF 2055H/L), and auxiliary agents such as carbon black. Wherein BF2055H/L has 20% of styrene, 55% of vinyl content and bimodal molecular weight distribution, and the dynamic modulus distribution and filler dispersion uniformity of the rubber are synergistically improved. Experiments prove that the composition can realize the comprehensive performance of tan delta (60 ℃) less than or equal to 0.088, adhesive strength more than or equal to 12.2N mm ‑1 , DIN abrasion less than or equal to 114mm 3 and master batch section torque controlled at 68-72 N.m on the premise of not sacrificing hardness and bearing capacity, and has excellent combustion efficiency, durability and process adaptability.

Inventors

  • REN HUIMING
  • ZHANG BINGYING
  • YAN JINJIE
  • CHEN SHENG
  • WANG DANLING

Assignees

  • 中策橡胶集团股份有限公司
  • 杭州海潮橡胶有限公司

Dates

Publication Date
20260508
Application Date
20260306

Claims (10)

  1. 1. The low-hysteresis high-durability tire ply rubber composition is characterized in that the rubber composition is prepared by mixing the following raw materials in parts by weight, wherein the raw materials comprise the following components in parts by weight: 70-90 parts of natural rubber; 5-15 parts of first solution polymerized styrene-butadiene rubber; 5-55 parts of second solution polymerized styrene-butadiene rubber; 40-55 parts of carbon black; Wherein, the first solution polymerized styrene-butadiene rubber and the second solution polymerized styrene-butadiene rubber are oil-free rubber, the styrene content is 20 plus or minus 1wt%, the vinyl content is 55 plus or minus 3wt%, the glass transition temperature is minus 35 plus or minus 2 ℃, and the weight average molecular weight is 380-420kg & mol -1 and 280-320kg & mol -1 respectively.
  2. 2. The low-hysteresis high-durability tire-ply rubber composition of claim 1, wherein said composition is prepared by mixing raw materials comprising, in parts by weight: 75-85 parts of natural rubber; 8-12 parts of first solution polymerized styrene-butadiene rubber; 8-12 parts of second solution polymerized styrene-butadiene rubber; 45-50 parts of carbon black.
  3. 3. The low-hysteresis high-durability tire-ply rubber composition according to claim 1, wherein the first solution polymerized styrene-butadiene rubber and the second solution polymerized styrene-butadiene rubber are respectively BF2055H and BF2055L solution polymerized styrene-butadiene rubber manufactured by chinese petrochemical company, ltd, wherein BF2055H has a styrene content of 20%, a vinyl content of 55%, no oil filling, tg= -35 ℃, a weight average molecular weight of 380-420 kg-mol -1 , BF2055L has a styrene content of 20%, a vinyl content of 55%, no oil filling, tg= -35 ℃, a weight average molecular weight of 280-320 kg-mol -1 , and a preferable mass ratio of 1.2:1-0.8:1.
  4. 4. A low hysteresis high endurance tire ply rubber composition as in claim 1, wherein the BET specific surface area of the carbon black particles is preferably 20 to 160m 2 /g, more preferably 40 to 130m 2 /g, still more preferably 50 to 120m 2 /g.
  5. 5. The low hysteresis high endurance tire ply rubber composition of claim 4 wherein the carbon black is one or more of N134, N220, N234, N375 or N375, N330, N339, N347, N326, N550, preferably the carbon black is N330 and/or N550.
  6. 6. The low-hysteresis high-durability tire-ply rubber composition according to claim 1, wherein the compounded raw material further comprises an activator, an anti-aging agent and a vulcanizing agent, preferably, the activator comprises 2-5 parts of zinc oxide, 1-3 parts of stearic acid, 2-4 parts of an anti-aging agent and 1.0-3.0 parts of insoluble sulfur and 1.0-2.0 parts of an accelerator.
  7. 7. The low hysteresis high endurance tire ply rubber composition of claim 6 wherein the accelerator comprises one or more of N-t-butyl-2-benzothiazole sulfenamide or N-cyclohexyl-2-benzothiazole sulfenamide, diphenyl guanidine accelerators, hexamethylenetetramine, 4 '-dithiodimorpholine, di-caprolactam disulfide, and the anti-aging agent comprises one or more of N-phenyl-N' - (1, 3-dimethylbutyl) -p-phenylenediamine, 2, 4-trimethyl-1, 2-dihydroquinoline polymer.
  8. 8. A compounding process for preparing the rubber composition of any one of claims 1 to 7, characterized in that the process comprises the steps of: 1) The rubber and the carbon black are put into an internal mixer for mixing for 50-60s at the temperature of 110-125 ℃; 2) Heating to 145-148 ℃ and continuously mixing for 40s to form master batch; 3) Cooling the masterbatch to 95-100deg.C, adding sulfur and promoter, and final refining.
  9. 9. Use of the rubber composition of any of claims 1-7 for making low hysteresis, high endurance automotive tire plies.
  10. 10. Tyre, characterized in that its ply compound is obtained by vulcanization of the rubber composition according to any one of claims 1 to 7.

Description

Low-hysteresis high-durability tire ply rubber composition, mixing method and tire Technical Field The invention relates to the technical field of tire manufacturing, in particular to a low-hysteresis high-durability tire ply rubber composition, a mixing method and a tire. Background The ply is the core bearing structure of the tire carcass and has the main functions of bearing the pressure in the tire, transmitting the road load and resisting the flexural fatigue, and the performance directly determines the service life, the high-speed safety and the rolling resistance level of the tire. The traditional ply rubber formula takes Natural Rubber (NR) as a main material, and is matched with emulsion polymerized styrene-butadiene rubber (SBR) or common oil-extended solution polymerized styrene-butadiene rubber (SSBR) for performance adjustment, and is matched with fillers such as carbon black and the like, so as to balance structural strength and processing fluidity. In the prior art scheme of the ply rubber formula, three major core pain points exist, namely 1) the durable attenuation caused by oil migration, namely free filling oil tends to migrate to a cord-rubber interface in the conventional oil-filled SSBR for the ply in the long-term service process, the bonding layer between the cord and the rubber is damaged, the ply delamination risk is increased, the durability (such as mileage life) of the tire is reduced, 2) the performance contradiction of the unimodal molecular weight rubber is that the unimodal high molecular weight SSBR can improve the ply strength, but the high viscosity can cause the mixing torque to be increased, the scorching risk is easily caused, the unimodal low molecular weight SSBR can improve the processability, but the stretching stress (M300) of the vulcanized rubber is reduced, the carcass bearing requirement cannot be met, 3) the hysteresis loss is large, the rolling resistance contribution is high, namely the vinyl content of the emulsion polymerized styrene-butadiene rubber is low (about 23 percent) in the conventional formula, or the molecular chain friction of the oil-filled SSBR is large, the dynamic hysteresis loss (tan delta (60 ℃) of the ply is higher than 0.10, the total rolling resistance of the tire is 20% -30%, and the green low-resistance requirement is difficult to adapt to the tire. Therefore, there is a need to develop a new ply formulation that achieves synergistic optimization of endurance improvement and rolling resistance reduction while preserving structural strength and processability. Disclosure of Invention In order to solve the technical problems, the invention aims to provide a low-hysteresis high-durability tire ply rubber composition, which realizes the balance of the comprehensive properties of ply rubber. In order to achieve the above purpose, the present invention adopts the following technical scheme: the low-hysteresis high-durability tire ply rubber composition is prepared by mixing the following raw materials in parts by weight, wherein the raw materials comprise the following components in parts by weight: 70-90 parts of natural rubber; 5-15 parts of first solution polymerized styrene-butadiene rubber; 5-55 parts of second solution polymerized styrene-butadiene rubber; 40-55 parts of carbon black; Wherein, the first solution polymerized styrene-butadiene rubber and the second solution polymerized styrene-butadiene rubber are oil-free rubber, the styrene content is 20 plus or minus 1wt%, the vinyl content is 55 plus or minus 3wt%, the glass transition temperature is minus 35 plus or minus 2 ℃, and the weight average molecular weight is 380-420kg & mol -1 and 280-320kg & mol -1 respectively. Preferably, the material is prepared by mixing the following raw materials in parts by weight: 75-85 parts of natural rubber; 8-12 parts of first solution polymerized styrene-butadiene rubber; 8-12 parts of second solution polymerized styrene-butadiene rubber; 45-50 parts of carbon black. Preferably, the first solution polymerized styrene-butadiene rubber and the second solution polymerized styrene-butadiene rubber are respectively BF2055H and BF2055L solution polymerized styrene-butadiene rubber manufactured by China petrochemical company, wherein the BF2055H comprises 20% of styrene, 55% of vinyl, no oil is filled, the Tg= -35 ℃, the weight average molecular weight is 380-420 kg-mol -1, the BF2055L comprises 20% of styrene, 55% of vinyl, no oil is filled, the Tg= -35 ℃, the weight average molecular weight is 280-320 kg-mol -1, and the preferable mass ratio is 1.2:1-0.8:1. Preferably, the BET specific surface area of the carbon black particles is preferably 20 to 160m 2/g, more preferably 40 to 130m 2/g, still more preferably 50 to 120m 2/g, still more preferably, the carbon black is one or more of N134, N220, N234, N375 or N375, N330, N339, N347, N326, N550, preferably the carbon black is N330 and/or N550. Preferably, the mixing raw materials further compris