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CN-121975193-A - Tread rubber composition, tread rubber, and preparation method and application thereof

CN121975193ACN 121975193 ACN121975193 ACN 121975193ACN-121975193-A

Abstract

The invention provides a tread rubber composition, tread rubber and a preparation method and application thereof. The tread rubber composition comprises, by weight, 80-120 parts of base rubber, 45-65 parts of white carbon black, 3-8 parts of a silane coupling agent, 1-7 parts of an ionic liquid and 1-2 parts of a vulcanizing agent, wherein the ionic liquid has a chemical structure shown in a formula (I), R 1 is selected from alkyl of C 1 ～C 5 , alkenyl of C 2 ～C 4 , -R 3 COOH or R 4 SO 3 H;R 3 and R 4 are respectively and independently selected from alkylene of C 1 ～C 4 , R 2 is selected from alkenyl of C 2 ～C 4 , and X ‑ is selected from halogen ions, tetrafluoroborate ions, hexafluorophosphate ions or bistrifluoromethane sulfonyl imide ions. The ionic liquid with the specific chemical structure is introduced into the tread rubber composition, so that an additional and reversible energy dissipation path can be constructed between the white carbon black and the base rubber, and the wear resistance of the prepared tread rubber is improved. (I)

Inventors

  • WANG NA
  • XIE MINGXIU
  • HE FUJIN
  • ZHANG YUANHONG
  • WU ZHONGCHAO

Assignees

  • 赛轮集团股份有限公司

Dates

Publication Date
20260505
Application Date
20260206

Claims (10)

  1. 1. The tread rubber composition is characterized by comprising, by weight, 80-120 parts of base rubber, 45-65 parts of white carbon black, 3-8 parts of a silane coupling agent, 1-7 parts of an ionic liquid and 1-2 parts of a vulcanizing agent, wherein the ionic liquid has a chemical structure shown in a formula (I): (I), Wherein R 1 is selected from the group consisting of alkyl of C 1 ～C 5 , alkenyl of C 2 ～C 4 , -R 3 COOH, or-R 4 SO 3 H;R 3 and R 4 are each independently selected from the group consisting of alkylene of C 1 ～C 4 , R 2 is selected from the group consisting of terminal alkenyl of C 2 ～C 4 , and X - is selected from the group consisting of halide ion, tetrafluoroborate ion, hexafluorophosphate ion, or bistrifluoromethane sulfonyl ion.
  2. 2. The tread band composition of claim 1, wherein in formula (I), the R 1 is selected from the group consisting of C 1 ～C 4 linear or branched alkyl, C 2 ～C 3 linear or branched alkenyl, -CH 2 COOH, or- (CH 2 ) 3 SO 3 H; the R 2 is selected from the group consisting of C 2 ～C 4 linear or branched alkenyl, the X - is selected from the group consisting of chloride, bromide, tetrafluoroborate, hexafluorophosphate, or bistrifluoromethanesulfonyl imide; Preferably, R 1 is selected from methyl, ethyl, n-butyl or vinyl, R 2 is selected from vinyl or allyl, and X - is selected from chloride or bromide; More preferably, the ionic liquid is selected from one or more of 1-allyl-3-methylimidazole chloride, 1-allyl-3-ethylimidazole bromide and 1-vinyl-3-ethylimidazole bromide.
  3. 3. The tread rubber composition according to claim 1 or 2, wherein the weight average molecular weight of the base rubber is 30 to 300 ten thousand g/mol, preferably the base rubber is one or more selected from the group consisting of polybutadiene rubber, natural rubber and styrene-butadiene rubber; preferably, the nitrogen adsorption specific surface area of the white carbon black is 90-300 m 2 /g, and the diameter of primary particles is 10-40 nm; preferably, the silane coupling agent is selected from one or more of sulfur-containing silane coupling agents and/or mercapto-containing silane coupling agents, more preferably bis- [ gamma- (triethoxysilane) propyl ] tetrasulfide, bis- [3- (triethoxysilane) propyl ] disulfide, 3- (Xin Xianliu yl) propyltriethoxysilane and 3-mercaptopropylethoxybis (tridecyl-pentaethoxy-siloxane); preferably, the vulcanizing agent is sulfur.
  4. 4. The tread band composition of any of claims 1 to 3, wherein the tread band composition further comprises a scorch retarder, preferably the tread band composition further comprises 0.01 to 0.5 parts by weight of the scorch retarder; Preferably, the scorch retarder is selected from the group consisting of N-cyclohexylthiophthalimide and/or N-nitrosodiphenylamine; Preferably, the tread band composition further comprises an auxiliary agent; more preferably, the tread rubber composition further comprises 10-20 parts by weight of the auxiliary agent; more preferably, the auxiliary agent is selected from one or more of an activator, an anti-aging agent, a protective wax, and a vulcanization accelerator; More preferably, the auxiliary agent comprises 3-5 parts by weight of the activating agent, 3-8 parts by weight of the anti-aging agent, 1-3 parts by weight of the protective wax and 3-4 parts by weight of the vulcanization accelerator.
  5. 5. Tread band, characterized in that it is obtained from the tread band composition according to any one of claims 1 to 4 by mixing and vulcanization.
  6. 6. A method of preparing the tread band of claim 5, comprising: step S1, mixing matrix rubber, white carbon black, a silane coupling agent and a solvent, and sequentially performing condensation treatment, solid-liquid separation and drying to obtain master batch; s2, mixing the master batch with ionic liquid to obtain a mixed batch; and step S3, mixing the mixed rubber and a vulcanizing agent, and vulcanizing to obtain the tread rubber.
  7. 7. The method for preparing tread rubber according to claim 6, wherein a part of the anti-aging agent is further introduced during the mixing in the step S1; Preferably, the step S1 comprises the steps of mixing the matrix rubber with the solvent to obtain a rubber solution, mixing the rubber solution, the white carbon black, the silane coupling agent and the part of the anti-aging agent to obtain a mixture, introducing the mixture into a coagulation device to contact and mix with a fluid medium and perform coagulation treatment to obtain a mixture, and sequentially performing solid-liquid separation and drying on the mixture to obtain the masterbatch, wherein the fluid medium is one or more selected from water, nitrogen, water vapor and oil; More preferably, the solid content of the rubber solution is 5-40wt%, and even more preferably, the solvent is one or more selected from n-hexane, toluene, xylene and chloroform; More preferably, the temperature of the fluid medium is 70-180 ℃; more preferably, the drying temperature is 100-250 ℃.
  8. 8. The method for producing a tread rubber according to claim 6 or 7, wherein one or more of an activator, a remaining part of an anti-aging agent and a protective wax are further introduced during the kneading in the step S2; Preferably, the step S2 comprises the steps of sequentially carrying out mixing and first heat preservation treatment on the masterbatch to obtain a first section of rubber material, mixing the first section of rubber material with the ionic liquid, and carrying out second heat preservation treatment to obtain a second section of rubber material; more preferably, the temperature of the first heat preservation treatment is 120-160 ℃ for 2-10 min, and even more preferably, the temperature of the first heat preservation treatment is 140-160 ℃ for 2-5 min; more preferably, the temperature of the second heat preservation treatment is 120-160 ℃ for 0.5-10 min, and still more preferably, the temperature of the second heat preservation treatment is 140-160 ℃ for 0.5-5 min.
  9. 9. The method for producing a tread rubber according to any one of claims 6 to 8, wherein an anti-scorch agent and/or a vulcanization accelerator is further introduced during the kneading in the step S3; preferably, the vulcanizing temperature is 140-165 ℃, the pressure is 8-15 MPa, and the vulcanizing time is 8-30 min.
  10. 10. Use of the tread band composition of any one of claims 1 to 4, or the tread band of claim 5, in a passenger car tire, truck tire or passenger car tire.

Description

Tread rubber composition, tread rubber, and preparation method and application thereof Technical Field The invention relates to the technical field of rubber, in particular to tread rubber composition, tread rubber and a preparation method and application thereof. Background In 1992, milcalin proposed a green tire using white carbon black as a reinforcing filler, which has lower rolling resistance and a certain wear resistance than a conventional tire. Because the surface of the white carbon black has a large number of hydroxyl groups, the surface of the white carbon black needs to be modified by adopting a silane coupling agent to improve the dispersibility of the white carbon black in a rubber matrix. However, a large number of chemical bonding actions, while advantageous for improving tensile strength, are disadvantageous in terms of elongation and tear resistance, and thus the abrasion resistance exhibited by white carbon compounds remains to be improved. The prior document (publication No. CN 104804231A) discloses a method for preparing high-performance tread rubber by utilizing the silanization reaction of ionic liquid in-situ catalytic filler, which uses ionic liquid as a catalyst for silanization of the filler surface, effectively promotes the dispersion of light-color fillers such as white carbon black and the like in rubber and the interface performance of rubber-filler, greatly reduces the silane consumption, improves the dynamic performance of tread rubber materials, and reduces rolling resistance and dynamic heat generation. However, from the results of the examples of this document, this method reduces the rolling resistance and elongation at break of the compound and increases the T300 modulus, apparently due to the too strong polymer-filler interactions. In the long term, too strong polymer-filler interactions can lead to poor rubber fatigue properties and reduce its elasticity and durability, thereby adversely affecting the rubber wear resistance. In addition, the ionic liquid selected in the document is a non-reactive ionic liquid (without double bonds), and cannot play a role in dissipating energy through hydrogen bond cleavage under the action of external force. The prior document (publication No. CN 118006009A) discloses a rubber composition, a preparation method and application thereof, which solves the problem of poor compatibility of resin and rubber matrix by in-situ modification of ionic liquid and resin in an internal mixer, and can completely replace stearic acid, and form an organic-metal complex with an accelerator and a vulcanizing agent. However, the ionic liquid in this document is mainly used for in-situ modification of terpene phenol resin to improve dispersibility of terpene phenol resin and rubber matrix, and its influence on dispersibility of white carbon black and abrasion resistance is not known. In summary, the above technical solutions have not been able to effectively improve the wear resistance of rubber. It is well known that the abrasion resistance of rubber is closely related to its resistance to crack propagation, and thus, establishing an efficient energy dissipation path, thereby improving the tear resistance of rubber is one of the important strategies for improving the abrasion resistance of rubber. But how to construct an additional and reversible energy dissipation path on the surface of the white carbon black without sacrificing other properties (such as hysteresis property, tensile strength and the like) is a problem to be solved at present. Therefore, a tread rubber composition with better white carbon black dispersibility and a permanently reversible energy dissipation path, tread rubber and a preparation method thereof are researched and developed, and the tread rubber composition has important significance for improving the wear resistance of the tread rubber. Disclosure of Invention The invention mainly aims to provide a tread rubber composition, tread rubber and a preparation method and application thereof, and aims to solve the problem that the prepared tread rubber is poor in wear resistance due to the fact that the chemical bonding strength of white carbon black rubber is too high and the energy dissipation path is weak in the prior art. In order to achieve the above purpose, the invention provides a tread rubber composition, which comprises, by weight, 80-120 parts of base rubber, 45-65 parts of white carbon black, 3-8 parts of silane coupling agent, 1-7 parts of ionic liquid and 1-2 parts of vulcanizing agent, wherein the ionic liquid has a chemical structure shown in formula (I): (I) Wherein R 1 is selected from the group consisting of alkyl of C 1～C5, alkenyl of C 2～C4, -R 3 COOH, or-R 4SO3H;R3 and R 4 are each independently selected from the group consisting of alkylene of C 1～C4, R 2 is selected from the group consisting of terminal alkenyl of C 2～C4, and X - is selected from the group consisting of halide ion, tetrafluoroborate ion, hex