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CN-120484352-B - Tire sidewall rubber composition and preparation method and application thereof

CN120484352BCN 120484352 BCN120484352 BCN 120484352BCN-120484352-B

Abstract

The invention belongs to the field of tire manufacturing, and particularly relates to a tire sidewall rubber composition, a preparation method and application thereof. The tire sidewall rubber composition comprises, by mass, 10-100 parts of natural rubber, 10-100 parts of butadiene rubber, 30-80 parts of carbon black, 1-15 parts of zinc oxide, 3-15 parts of rubber oil, 1-5 parts of fatty acid compounds, 1-4 parts of protective wax, 0.5-4 parts of anti-aging agents, 1-8 parts of sulfur powder, 0.5-3 parts of accelerators, 0.05-0.5 part of scorch retarders, 0.3-3 parts of pyrazolone heterocyclic compounds and 0.5-5 parts of phenolic compounds. Wherein, pyrazolone heterocyclic compound, phenolic compound and traditional anti-aging agent synergistic effect have made up the deficiency of traditional anti-aging agent, have also promoted the comprehensive properties of the whole rubber composite material obviously, thus has lengthened the life time of the tire sidewall effectively, tire made of this rubber composition, tire sidewall has excellent durability and use safety.

Inventors

  • MOU CHENGQIAN
  • NIU FEI
  • JIN QI
  • XU JUNLONG
  • HAN SONGLIANG
  • ZHAO DONGHAI
  • KONG DELU
  • LIU LU

Assignees

  • 山东华勤橡胶科技有限公司
  • 通力轮胎有限公司
  • 华勤橡胶工业集团有限公司

Dates

Publication Date
20260508
Application Date
20250611

Claims (9)

  1. 1. The tire sidewall rubber composition is characterized by comprising a pyrazolone heterocyclic compound and a phenolic compound, wherein the pyrazolone heterocyclic compound is 1-phenyl-3-methyl-5-pyrazolone, and the phenolic compound is D-alpha tocopherol; The tire sidewall rubber composition comprises, by mass, 10-40 parts of natural rubber, 60-100 parts of butadiene rubber, 30-80 parts of carbon black, 1-15 parts of zinc oxide, 3-15 parts of rubber oil, 1-5 parts of fatty acid compounds, 1-4 parts of protective wax, 0.5-4 parts of anti-aging agents, 1-8 parts of sulfur powder, 0.5-3 parts of accelerators, 0.05-0.5 part of scorch retarders, 0.3-3 parts of pyrazolone heterocyclic compounds and 0.5-5 parts of phenolic compounds.
  2. 2. The tire side wall rubber composition according to claim 1, wherein the pyrazolone heterocyclic compound is 0.5 to 2 parts by mass and the phenolic compound is 1 to 4 parts by mass.
  3. 3. The tire side wall rubber composition according to claim 2, wherein the pyrazolone heterocyclic compound is 0.8 to 1.2 parts by mass and the phenolic compound is 2 to 3 parts by mass.
  4. 4. The tire sidewall rubber composition of claim 1, wherein the fatty acid compound is stearic acid.
  5. 5. The tire sidewall rubber composition of claim 1, wherein the anti-aging agent is 6PPD and the scorch retarder is CTP.
  6. 6. The tire sidewall rubber composition of claim 1, wherein the carbon black is at least one of N330, N375.
  7. 7. The tire sidewall rubber composition of claim 1, wherein the accelerator is at least one of accelerator NS, accelerator CZ, accelerator DZ, and accelerator DM.
  8. 8. The method for producing a tire side wall rubber composition according to claim 1, comprising the steps of: (1) Adding natural rubber, butadiene rubber, 3/4 carbon black, zinc oxide, a fatty acid compound, protective wax and an anti-aging agent into an internal mixer for mixing, adding rubber oil, mixing and discharging rubber to obtain a primary master batch M1; (2) Adding the first-stage masterbatch M1 into an internal mixer, adding residual carbon black and pyrazolone heterocyclic compound in the formula for mixing, and finally adding phenolic compound for mixing and discharging rubber to obtain the first-stage masterbatch M2; (3) And final mixing, namely adding the two-stage master batch M2, sulfur powder, an accelerator and a scorch retarder CTP into an internal mixer for mixing, discharging rubber, and tabletting for manufacturing the tread in the next working procedure.
  9. 9. Use of the tire side wall rubber composition according to any one of claims 1 to 7 or the tire side wall rubber composition prepared according to claim 8 in the manufacture of a tire.

Description

Tire sidewall rubber composition and preparation method and application thereof Technical Field The invention belongs to the field of tire manufacturing, and particularly relates to a tire sidewall rubber composition, a preparation method and application thereof. Background The information disclosed in the background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. The tire sidewall is used as a key part directly exposed to the external environment, is influenced by severe environmental factors such as high temperature, ozone, ultraviolet rays and the like for a long time, and causes breakage, crosslinking or oxidative degradation of a rubber molecular chain, thereby triggering tortoise cracks and seriously influencing the service life and the driving safety of the tire. At present, the aging process is mainly delayed by adding an anti-aging agent (such as amine compounds) and an anti-ozone auxiliary agent (such as protective wax) into a rubber formula in the industry. However, the prior art has the obvious defects that on one hand, the traditional amine anti-aging agent is easy to migrate and lose efficacy under the high-temperature condition, so that the protection effect is gradually attenuated along with the service time, and on the other hand, the carbon distribution of the protection wax is difficult to meet the constant migration speed in different temperature intervals, so that the protection effect is unstable. In addition, under the synergistic effect of ozone and ultraviolet rays, photooxidation and ozone cracking reactions are easy to occur on the surface of the rubber, and the existing auxiliary agent has limited ageing resistance, so that the mechanical property and weather resistance of the rubber are difficult to maintain for a long time. Therefore, development of a novel rubber formula is needed, and the high-performance and long-life product requirements of the tire industry are met by optimizing an anti-aging agent system or introducing high-efficiency and stable anti-aging components to obviously improve the protection capability of the tire sidewall under the combined action of high temperature, ozone and ultraviolet rays and simultaneously ensure long-acting durability. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a tire sidewall rubber composition, and a preparation method and application thereof. The rubber composition provided by the invention can obviously improve the protective capability of the tire sidewall under the comprehensive actions of high temperature, ozone and ultraviolet rays, and simultaneously ensure long-acting durability. In order to achieve the above purpose, the technical scheme of the invention is as follows: in a first aspect, the invention provides a tire sidewall rubber composition, which comprises a pyrazolone heterocyclic compound and a phenolic compound, wherein the pyrazolone heterocyclic compound is 1-phenyl-3-methyl-5-pyrazolone, and the structural formula is shown as formula I: the phenolic compound is D-alpha tocopherol. The pyrazolone heterocyclic compound contains active groups capable of capturing free radicals, and can effectively interrupt an oxidation reaction chain initiated by the free radicals, so that the aging process of rubber is delayed. On the one hand, the phenolic compound has excellent oxidation resistance, can stabilize peroxide in rubber and prevent the peroxide from decomposing to damage a rubber molecular chain, and on the other hand, the phenolic compound can endow the rubber with better flexibility and further improve the crack resistance and durability. The two compounds are synergistic with traditional antioxidants to form a more efficient antioxidant system. In some embodiments, the tire sidewall rubber composition consists of natural rubber, butadiene rubber, carbon black, zinc oxide, rubber oil, fatty acid compounds, protective wax, anti-aging agents, sulfur powder, accelerators, scorch retarders, 1-phenyl-3-methyl-5-pyrazolone, D-alpha tocopherol. In some embodiments, the tire sidewall rubber composition consists of the following raw materials in parts by mass: 10-100 parts of natural rubber, 10-100 parts of butadiene rubber, 30-80 parts of carbon black, 1-15 parts of zinc oxide, 3-15 parts of rubber oil, 1-5 parts of fatty acid compound, 1-4 parts of protective wax, 0.5-4 parts of anti-aging agent, 1-8 parts of sulfur powder, 0.5-3 parts of accelerator, 0.05-0.5 part of scorch retarder, 0.3-3 parts of pyrazolone heterocyclic compound and 0.5-5 parts of phenolic compound. Further, the natural rubber is STR20 and acetone extract 1.5-3.2%, and the natural rubber is preferably 20-80 parts by mass, more preferably 40-60 parts by mass. Further, the butadie