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CN-122011528-A - Low-rolling-resistance tire tread rubber and preparation method thereof

CN122011528ACN 122011528 ACN122011528 ACN 122011528ACN-122011528-A

Abstract

The invention discloses a low rolling resistance tire tread rubber and a preparation method thereof, which belong to the technical field of rubber, and adopt high-strength aging-resistant styrene-butadiene rubber and natural rubber as basic rubber, and carry out modification treatment on potassium hexatitanate whisker through gamma-methacryloxypropyl trimethoxysilane to endow double bonds, then, the modified potassium hexatitanate whisker can be stably dispersed in a polymerization network of the high-strength aging-resistant styrene-butadiene rubber by irradiation, so that the dispersion and chain segment movement capacity of a filler in the rubber are optimized, the rolling resistance is obviously reduced, and good aging resistance and mechanical strength are provided for an integral material.

Inventors

  • ZHANG NA

Assignees

  • 浙江开放大学瑞安学院(瑞安城市学院、瑞安社区学院、瑞安市老年大学)

Dates

Publication Date
20260512
Application Date
20260416

Claims (10)

  1. 1. The low rolling resistance tire tread rubber comprises the following components in parts by weight: 80-90 parts of natural rubber, 40-50 parts of high-strength anti-aging styrene-butadiene rubber, 20-22 parts of carbon black N330, 5-7 parts of silane coupling agent Si-69, 2-4 parts of stearic acid, 3-5 parts of zinc oxide, 3-5 parts of naphthenic oil, 2-3 parts of anti-aging agent RD, 3-4 parts of sulfur, 1.6-1.8 parts of accelerator TMTD and 1.2-1.4 parts of accelerator NOBS.
  2. 2. The low rolling resistance tire tread rubber according to claim 1, wherein the high-strength anti-aging styrene-butadiene rubber is specifically prepared by the following steps: Step one, liquid polybutadiene and styrene are used as raw materials, glycidyl methacrylate is used as a third functional monomer, and modified styrene-butadiene rubber latex is obtained through free radical copolymerization; Step two, preparing ageing-resistant styrene-butadiene rubber latex by taking modified styrene-butadiene rubber latex and para-aminodiphenylamine as raw materials through amino ring-opening epoxy reaction; And thirdly, vulcanizing and shrinking the anti-aging styrene-butadiene rubber latex under irradiation to form rubber nano particles, wherein residual double bonds in the structure can be broken with double bonds of the modified potassium hexatitanate whisker and hydroxyethyl methacrylate under irradiation to obtain the high-strength anti-aging styrene-butadiene rubber.
  3. 3. The low rolling resistance tire tread rubber according to claim 2, wherein the modified styrene-butadiene rubber latex is specifically prepared by the following steps: Placing the pre-emulsion in a reaction kettle, stirring for 10-12min at 30-35 ℃ and 400-500r/min, then adding potassium persulfate, continuously stirring for reaction for 1-2h, then adding glycidyl methacrylate, continuously stirring for reaction for 1h, and naturally cooling to room temperature to obtain modified styrene-butadiene rubber latex; The dosage ratio of the pre-emulsion to the potassium persulfate to the glycidyl methacrylate is 190-195mL, 1.4-1.6g and 3.2-4.4g.
  4. 4. The low rolling resistance tire tread band according to claim 3, wherein the pre-emulsion is specifically prepared by the following steps: Adding liquid polybutadiene, styrene, alkylphenol ethoxylates and sodium dodecyl sulfate into a reaction kettle, stirring for 20-30min at 50-60 ℃ and 400-500r/min, then adding trisodium phosphate solution with the mass fraction of 10-12%, adjusting the pH value to 8-9, continuously stirring for 30-40min, placing the product into ice water at 0 ℃, and performing ultrasonic dispersion for 30-40min to obtain the pre-emulsion.
  5. 5. The low rolling resistance tire tread rubber according to claim 2, wherein the dosage ratio of the liquid polybutadiene, the styrene, the alkylphenol ethoxylates, the sodium dodecyl sulfate and the trisodium phosphate solution is 160-170g:120-122g:11.5-11.7g:1.4-1.6g:30-40mL.
  6. 6. The low rolling resistance tire tread rubber according to claim 2, wherein the specific preparation steps of the anti-aging styrene-butadiene rubber latex are as follows: adding the para-aminodiphenylamine and the modified styrene-butadiene rubber latex into a reaction kettle according to the dosage ratio of 50-60g to 180-190mL, stirring for 20-30min at 50-60 ℃ and 400r/min, continuously stirring for 2-4h under nitrogen atmosphere, and naturally cooling to room temperature to obtain the anti-aging styrene-butadiene rubber latex.
  7. 7. The low rolling resistance tire tread rubber according to claim 2, wherein the modified potassium hexatitanate whisker is specifically prepared by the following steps: Adding ethanol and deionized water into a reaction kettle, stirring for 20-30min at 50-60 ℃ and 400r/min, then regulating the pH value to 4-5 with acetic acid, then adding gamma-methacryloxypropyl trimethoxy silane, continuously stirring for 1-2h, adding potassium hexatitanate whisker, performing ultrasonic dispersion for 40-60min, naturally standing for 30-40min, performing suction filtration, washing the product with deionized water for 2-4 times, and performing vacuum drying for 1-2h at 120-130 ℃ to obtain the modified potassium hexatitanate whisker.
  8. 8. The low rolling resistance tire tread rubber according to claim 7, wherein the dosage ratio of ethanol, deionized water, gamma-methacryloxypropyl trimethoxysilane and potassium hexatitanate whiskers is 900-1000ml:100-120ml:30-40g:100-120g.
  9. 9. The low rolling resistance tire tread rubber according to claim 2, wherein the high-strength anti-aging styrene-butadiene rubber is specifically prepared by the following steps: stirring and mixing the ageing-resistant styrene-butadiene rubber latex, the modified potassium hexatitanate whisker and the hydroxyethyl methacrylate, then irradiating for 4-6 hours under the irradiation dose of 10-12kGy, filtering, washing the product with deionized water for 2-4 times, and vacuum drying for 1-2 hours at 40-50 ℃ to obtain high-strength ageing-resistant styrene-butadiene rubber; The usage ratio of the anti-aging styrene-butadiene rubber latex to the modified potassium hexatitanate whisker to the hydroxyethyl methacrylate is 70-80g, 3-5g and 4-8g.
  10. 10. The method for preparing the low rolling resistance tire tread rubber according to claim 1, wherein the specific preparation steps of the low rolling resistance tire tread rubber are as follows: Placing natural rubber and high-strength aging-resistant styrene-butadiene rubber into an open mill for plasticating, plasticating for 16-18min at 56-58 ℃, then carrying out thin-pass for 3-5 times to obtain plasticated rubber, adding the plasticated rubber into the internal mixer, mixing for 2-4min at 65-70 ℃ and 50-60r/min, then adding carbon black, si-69, stearic acid, zinc oxide, naphthenic oil and an anti-aging agent, mixing for 12-14min, discharging, naturally cooling for 10-12h to obtain the banburying rubber, transferring the banburying rubber into the open mill, controlling the processing temperature at 60-70 ℃, adding sulfur, an accelerator TMTD and an accelerator NOBS, carrying out thin-pass for 4-6 times, naturally cooling the obtained piece to obtain the rubber compound, and vulcanizing the rubber compound at 150-160 ℃ for 25-30min to obtain the tread rubber of the low-rolling-resistance tire.

Description

Low-rolling-resistance tire tread rubber and preparation method thereof Technical Field The invention belongs to the technical field of rubber, and particularly relates to low-rolling-resistance tire tread rubber and a preparation method thereof. Background The tyre is an important component of modern automobiles, and plays important roles in bearing, traction, braking and the like on automobile bodies. Tires are a typical rubber composite system, and since natural rubber has higher rubber strength, excellent physical properties and adhesive properties, all natural rubber or natural rubber is usually selected and a small amount of styrene-butadiene rubber is used for the tire body rubber material of the automobile tire, and most of fillers are carbon black systems. The tire is continuously deformed in the running process, heat can be generated due to hysteresis loss under the action of alternating load, so that the internal temperature is increased, the air tightness of the tire and the adhesive strength between the tire and a framework material are further reduced, meanwhile, the rolling resistance of the tire is increased due to deformation increase, and fatigue damage is generated on a natural rubber system, so that possible safety accidents are caused. Therefore, the material selection and formula adjustment of the rubber composite material system are used for reducing the rolling resistance and dynamic heat rise of the tire, and the method has important practical significance. The Chinese patent application with publication number of CN108912420A discloses a preparation method of a high wear-resistant rubber material for a tire, in the scheme, potassium hexatitanate whisker and boron nitride can be used as carriers of sulfur, so that the dispersibility of the sulfur in a rubber substrate is promoted, the aggregation of the sulfur is prevented, the uniform distribution of the sulfur in the substrate is promoted, and the mechanical property of the rubber is improved, but in the scheme, strong repulsive force exists between the potassium hexatitanate whisker and boron nitride filler and a rubber interface, so that the filler tends to aggregate, cannot be effectively dispersed in the rubber, and the mechanical strength of the rubber material is insufficient. Disclosure of Invention The invention aims to provide a low rolling resistance tire tread rubber and a preparation method thereof, wherein high-strength ageing-resistant styrene-butadiene rubber and natural rubber are adopted as base rubber, gamma-methacryloxypropyl trimethoxy silane is used for modifying potassium hexatitanate whisker and then endowing double bonds, and then irradiation is utilized to enable the modified potassium hexatitanate whisker to be stably dispersed in a polymerization network of the high-strength ageing-resistant styrene-butadiene rubber, so that the dispersion and chain segment movement capacity of a rubber internal filler are optimized, the rolling resistance is obviously reduced, and the good ageing resistance and mechanical strength of an integral material are endowed. The aim of the invention can be achieved by the following technical scheme: the low rolling resistance tire tread rubber comprises the following components in parts by weight: 80-90 parts of natural rubber, 40-50 parts of high-strength anti-aging styrene-butadiene rubber, 20-22 parts of carbon black N330, 5-7 parts of silane coupling agent Si-69, 2-4 parts of stearic acid, 3-5 parts of zinc oxide, 3-5 parts of naphthenic oil, 2-3 parts of anti-aging agent RD, 3-4 parts of sulfur, 1.6-1.8 parts of accelerator TMTD and 1.2-1.4 parts of accelerator NOBS. Further, the preparation method of the high-strength anti-aging styrene-butadiene rubber specifically comprises the following steps: The first step is to use liquid polybutadiene and styrene as raw materials, glycidyl methacrylate as a third functional monomer, and obtain the modified styrene-butadiene rubber latex through free radical copolymerization. And secondly, preparing the anti-aging styrene-butadiene rubber latex by taking the modified styrene-butadiene rubber latex and the para-aminodiphenylamine as raw materials through an amino ring-opening epoxy reaction. And thirdly, vulcanizing and shrinking the anti-aging styrene-butadiene rubber latex under irradiation to form rubber nano particles, wherein residual double bonds in the structure can be broken with double bonds of the modified potassium hexatitanate whisker and hydroxyethyl methacrylate under irradiation to obtain the high-strength anti-aging styrene-butadiene rubber. Further, the specific preparation steps of the modified styrene-butadiene rubber latex are as follows: Placing the pre-emulsion in a reaction kettle, stirring for 10-12min at 30-35 ℃ and 400-500r/min, then adding potassium persulfate, continuously stirring for reaction for 1-2h, then adding glycidyl methacrylate, continuously stirring for reaction for 1h, and naturally cooling to