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CN-121975194-A - Low-heat-generation high-flex-resistance tire base rubber composition, mixing method and tire

CN121975194ACN 121975194 ACN121975194 ACN 121975194ACN-121975194-A

Abstract

The invention relates to the technical field of tire manufacturing, in particular to a low-heat-generation high-flex-resistance tire base rubber composition, a mixing method and a tire. The rubber comprises 100 parts by weight of rubber component, and comprises natural rubber, first and second oil-free solution polymerized styrene-butadiene rubber (BF 2055H/L), butadiene rubber and auxiliary agents such as carbon black and silane coupling agent. 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 comprehensive performance of tan delta (60 ℃) less than or equal to 0.07, bonding strength more than or equal to 3.6 kN/m and flex crack life reaching 15.2-17.8 ten thousand times on the premise of not sacrificing hardness and bearing capacity, is obviously superior to the existing oil-filled formula, and has excellent combustion efficiency, low heat generation, flex resistance and process adaptability.

Inventors

  • REN HUIMING
  • LIU HUI
  • DONG XINGWANG
  • LIU GUOQING
  • HUANG DAYE
  • 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
20260505
Application Date
20260306

Claims (10)

  1. 1. The low-heat-generation high-flex-resistance tire base rubber composition is characterized by being prepared by mixing the following raw materials in parts by weight, wherein the raw materials comprise the following components in parts by weight: 45-65 parts of natural rubber; 10-30 parts of solution polymerized styrene-butadiene rubber; 15-35 parts of butadiene rubber; 40-60 parts of carbon black; 1.0 to 5.0 parts of silane coupling agent; The solution polymerized styrene-butadiene rubber consists of a first solution polymerized styrene-butadiene rubber and a second solution polymerized styrene-butadiene rubber which are used together according to the mass ratio of 1:1.5 to 1.5:1, 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+/-1 wt%, the vinyl content is 55+/-3 wt%, the glass transition temperature is-35+/-2 ℃, and the weight average molecular weight is 380-420 kg.mol -1 and 280-320 kg.mol -1 respectively.
  2. 2. The low-heat-generation high-flex-resistance tire base rubber composition according to claim 1, is characterized by being prepared by mixing the following raw materials in parts by weight: 55-65 parts of natural rubber; 15-25 parts of solution polymerized styrene-butadiene rubber; 15-25 parts of butadiene rubber; 50-60 parts of carbon black; 1.5-3.0 parts of silane coupling agent.
  3. 3. The low heat generation high flex resistance tire base 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 produced by China petrochemical Co., ltd., wherein the weight average molecular weight is 380-420kg & mol -1 , the weight average molecular weight is 20%, the weight average molecular weight is 55%, the weight average molecular weight is not 35%, the weight average molecular weight is 280-320kg & mol -1 , and the preferred mass ratio is 1:1.5 to 1:1.
  4. 4. A low heat generation high flex resistant tire base rubber composition according to claim 1, characterized in that the BET specific surface area of the carbon black particles is preferably 20-160m 2 /g, more preferably 40-130m 2 /g, still more preferably 50-120m 2 /g.
  5. 5. The low heat generation high flex tire base rubber composition as described in 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 heat generation high flex resistant tire base rubber composition as defined in claim 1, wherein the silane coupling agent has the structural formula Y-R-Si (OR) 3, wherein Y is an organic functional group, siOR is a siloxy group, preferably, the silane coupling agent is one OR more selected from the group consisting of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris (beta-methoxyethoxy) silane, bis- [ gamma- (triethoxysilane) propyl ] tetrasulfide, bis-propyltriethoxysilane disulfide, 3- (Xin Xianliu yl) propyltriethoxysilane and n-octyltriethoxysilane.
  7. 7. The low-heat-generation high-flex-resistance tire base rubber composition according to claim 1, wherein the mixing raw materials further comprise 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, the vulcanizing agent comprises 1.0-3.0 parts of insoluble sulfur and 1.0-2.0 parts of an accelerator, and further preferably, the accelerator comprises one or more of N-tert-butyl-2-benzothiazole sulfenamide or N-cyclohexyl-2-benzothiazole sulfenamide, diphenyl guanidine accelerator, hexamethylenetetramine, 4' -dithiodimorpholine and dihexactane disulfide.
  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, the carbon black, the high-dispersion white carbon black and the silane coupling agent are put into an internal mixer for mixing for 30-90 s at 100-115 ℃; 2) Heating to 140-145 ℃ and continuously mixing 30-40 s to form master batch; 3) Cooling the masterbatch to 90-95 ℃, and adding sulfur and an accelerator for final refining.
  9. 9. Use of the rubber composition according to any one of claims 1 to 7 for the manufacture of a low heat build up high flex resistance automotive tire base stock.
  10. 10. Tyre, characterized in that its base rubber is obtained by vulcanization of the rubber composition according to any one of claims 1to 7.

Description

Low-heat-generation high-flex-resistance tire base rubber composition, mixing method and tire Technical Field The invention relates to the technical field of tire manufacturing, in particular to a low-heat-generation high-flex-resistance tire base rubber composition, a mixing method and a tire. Background In the service process of the tire, the base rubber needs to bear dynamic load transmitted by the tread and shear stress generated by deformation of the tire body, and the performance of the base rubber directly influences the durability and the safety of the tire. The traditional base rubber formula is mainly filled by adopting a basic system of Natural Rubber (NR) +emulsion polymerized styrene-butadiene rubber (ESBR) +butadiene rubber (BR) and matching carbon black, but has the following technical defects that 1) the emulsion polymerized styrene-butadiene rubber is oil-filled rubber, oil plasticizers increase the friction between molecular chains, so that dynamic hysteresis loss (Tan delta (60 ℃) is increased, the base rubber is easy to cause thermal oxidation aging due to heat accumulation in high-speed running, the service life of the tire is shortened, 2) the flex resistance is insufficient, the oil-free rubber system/the rubber system without adding the oil plasticizers are difficult to combine the processing flowability and the uniformity of a crosslinked network, cracks are easy to occur under long-term repeated deformation, and 3) the interfacial adhesion is unstable, the compatibility of the ESBR and the natural rubber is poor, the viscosity influence of a carbon black dispersion receptor system is large, and an adhesion weak area is easy to form at the interface between the base rubber and the tread/a ply, so that interlayer stripping is caused. In the prior art, although oil-filled high-vinyl SSBR is adopted to replace part of ESBR to improve the flexibility, the heat generation problem cannot be solved by an oil-filled design, and a scheme that the oil-filled high-vinyl SSBR (such as Mw=400 kg, mol -1) is adopted without oil-filled SSBR is adopted, so that the heat generation is reduced, but the processing is difficult due to high viscosity, and the carbon black is unevenly dispersed, so that the flexibility is affected. Therefore, developing a base adhesive formulation that combines low heat generation, high flex resistance and processing flexibility becomes a critical requirement for the tire industry. Disclosure of Invention In order to solve the technical problems, the invention aims to provide the low-heat-generation high-flex-resistance tire base rubber composition, which realizes the technical bottleneck that the base rubber cannot achieve both low heat generation and high flex resistance, and has outstanding energy conservation and industrial popularization value. In order to achieve the above purpose, the present invention adopts the following technical scheme: the low-heat-generation high-flex-resistance tire base 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: 45-65 parts of natural rubber; 10-30 parts of solution polymerized styrene-butadiene rubber; 15-35 parts of butadiene rubber; 40-60 parts of carbon black; 1.0 to 5.0 parts of silane coupling agent; The solution polymerized styrene-butadiene rubber consists of a first solution polymerized styrene-butadiene rubber and a second solution polymerized styrene-butadiene rubber which are used together according to the mass ratio of 1:1.5 to 1.5:1, 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+/-1 wt%, the vinyl content is 55+/-3 wt%, the glass transition temperature is-35+/-2 ℃, and the weight average molecular weight is 380-420 kg.mol -1 and 280-320 kg.mol -1 respectively. Preferably, the material is prepared by mixing the following raw materials in parts by weight: 55-65 parts of natural rubber; 15-25 parts of solution polymerized styrene-butadiene rubber; 15-25 parts of butadiene rubber; 50-60 parts of carbon black; 1.5-3.0 parts of silane coupling agent. 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 percent of styrene, 55 percent of vinyl, no oil charge, the Tg= -35 ℃, the weight average molecular weight is 380-420 kg-mol -1, the BF2055L comprises 20 percent of styrene, 55 percent of vinyl, no oil charge, the Tg= -35 ℃, the weight average molecular weight is 280-320 kg-mol -1, and the preferable mass ratio is 1:1.5-1:1. Preferably, the BET specific surface area of the carbon black particles is preferably 20 to 160m 2/g, more preferably 40 to 130m 2/