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CN-121975195-A - Low-heat-generation tread rubber composition and mixing method thereof

CN121975195ACN 121975195 ACN121975195 ACN 121975195ACN-121975195-A

Abstract

The invention relates to the technical field of tire rubber manufacturing, and discloses a low-heat-generation tread rubber composition and a mixing method thereof. The tread rubber composition is added with a silicon carbide nanowire composite material (NR/SiCnw-SH), and the silicon carbide nanowire composite material is prepared from a silicon carbide nanowire grafted with mercapto and natural latex, and has good compatibility with a rubber matrix. NR/SiCnw-SH can effectively replace part of carbon black, reduce internal heat generation of the tread rubber composition and reduce energy loss of the tire. And a new wet mixing process is used, which is different from dry mixing, so that the dispersibility of the filler is greatly improved, and the physical properties of the sizing material are obviously improved.

Inventors

  • LU XIAOQI
  • SHAO YULONG
  • CHEN LI
  • HUANG DAYE
  • YU BOWEN
  • ZHAO JIANBO
  • LIU HUI
  • 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
20260310

Claims (10)

  1. 1. The low-heat-generation tread rubber composition is characterized by being prepared by mixing the following raw materials in parts by weight: 50.0-70.0 parts of natural rubber, 20.0-40.0 Parts of styrene butadiene rubber, 5.0 To 20.0 parts of butadiene rubber, 20.0-50.0 Parts of carbon black, 10.0 To 15.0 parts of silicon carbide nanowire composite material, 5.0-20.0 Parts of operation oil; the silicon carbide nanowire composite material is prepared from a mercapto-grafted silicon carbide nanowire and natural latex.
  2. 2. The low heat generation tread rubber composition as claimed in claim 1, wherein the rubber composition is prepared by mixing the following raw materials in 100 parts by weight of raw rubber: 55.0-65.0 parts of natural rubber, 25.0-35.0 Parts of styrene butadiene rubber, 5.0 To 15.0 parts of butadiene rubber, 30.0-40.0 Parts of carbon black, 5.0 To 20.0 parts of silicon carbide nanowire composite material, 5.0-15.0 Parts of operation oil, 1.0 To 4.0 parts of an anti-aging agent, 1.0 To 5.0 parts of active agent, 1.0-4.0 Parts of promoter, 1.0-5.0 Parts of vulcanizing agent.
  3. 3. A low heat generation tread rubber composition according to claim 1 or 2, wherein the method of preparing the silicon carbide nanowire composite comprises the steps of: (1) Preparing a sulfhydrylation silicon carbide nanowire, namely carrying out surface hydroxylation activation on the silicon carbide nanowire, then adopting a silane coupling agent to modify the surface of the silicon carbide nanowire to graft sulfhydrylation, and carrying out vacuum drying on a product to obtain the sulfhydrylation silicon carbide nanowire; (2) Adding a vulcanizing agent, a vulcanizing active agent, a vulcanizing accelerator and a pH regulator into deionized water to prepare a uniform mixed solution A, preparing a solution of the mercapto silicon carbide nanowire and natural latex into the mixed solution to prepare a uniform precursor suspension, performing quick freezing and freeze-drying treatment on the precursor suspension, and finally vulcanizing to obtain the silicon carbide nanowire composite material.
  4. 4. A low heat generation tread rubber composition according to claim 3, wherein the surface hydroxylation activation is performed by alkali treatment, and the silicon carbide nanowires are treated with 4.5 to 5.5mol/L sodium hydroxide solution.
  5. 5. The low heat generation tread rubber composition of claim 3, wherein the silane coupling agent is formulated as an aqueous ethanol solution having a concentration of 1.5 to 2.5 wt.%; and/or the silane coupling agent is 3-mercaptopropyl triethoxysilane.
  6. 6. A low heat generation tread rubber composition according to claim 3, wherein the vulcanizing agent concentration in the mixed solution a is 0.5 to 1.5 wt.%, the vulcanizing active agent concentration is 0.3 to 0.5wt.%, and the vulcanizing accelerator concentration is 0.4 to 0.6wt.%; And/or, the vulcanizing agent is sulfur; and/or, the vulcanization activator is zinc oxide; and/or, the vulcanization accelerator is zinc diethyl dithiocarbamate; And/or, the pH regulator is potassium hydroxide.
  7. 7. A low heat generation tread rubber composition according to claim 3, wherein the precursor suspension is flash frozen by liquid nitrogen for a period of 5 to 15 minutes; And/or the freeze-drying condition is-45 ℃ to-35 ℃ and 35-45 Pa.
  8. 8. The low heat generation tread rubber composition according to claim 1 or 2, wherein the carbon black has a particle diameter of 30 to 40nm.
  9. 9. The low heat generation tread rubber composition according to claim 2, wherein the active agent is zinc oxide and stearic acid, wherein the zinc oxide is 1.0-4.0 parts and the stearic acid is 1.0-3.0 parts; And/or the accelerator adopts an accelerator NS and an accelerator CZ, wherein the accelerator NS is 0.2-2.0 parts, and the accelerator CZ is 0.2-2.0 parts; And/or the vulcanizing agent adopts sulfur.
  10. 10. A method of kneading a low heat generation tread rubber composition according to any one of claims 1 to 9, wherein wet kneading is employed, comprising the steps of: 1) Preparing master batch, namely mixing and grinding filler, silicon carbide nanowire composite material and water to prepare filler dispersion liquid, preparing raw rubber into raw rubber aqueous solution, adding the filler dispersion liquid into the raw rubber aqueous solution, uniformly stirring, adding calcium chloride aqueous solution to flocculate, and cleaning and drying a flocculated product to obtain the master batch; 2) Mixing by an open mill, namely preheating by the open mill, adding the masterbatch to plasticate to a wrapping roller, adding the processing aid to continue mixing, adjusting the roll spacing to sequentially perform triangular wrapping and rolling, and adjusting the roll spacing to obtain the tread rubber composition after repeating for three times.

Description

Low-heat-generation tread rubber composition and mixing method thereof Technical Field The invention relates to the technical field of tire rubber manufacturing, in particular to a low-heat-generation tread rubber composition and a mixing method thereof. Background In recent years, due to the enhancement of energy conservation and environmental protection consciousness, a green tire is rapidly popularized. It is advocated to prepare tires having excellent fuel saving performance, wet skid resistance, low noise pollution and low emission by changing the tire formulation and pattern design. Compared with the traditional tire, the rolling resistance of the tire can be reduced by 22% -35%, and the fuel consumption of the vehicle can be reduced by 3% -8%. While the tread in a tire is a critical part affecting energy consumption. The tread, as a part of the vehicle directly contacting the ground, plays roles in protecting the carcass, transmitting driving force and braking force, damping, noise reduction, and the like. The tyre tread has three main damage modes, namely (1) mechanical damage, namely when the tyre is impacted by the ground or the penetrating power generated by sharp objects reaches the limit of rubber strength in the running process of the vehicle, the tyre can generate cracks, rubber dropping and other phenomena, and (2) fatigue damage, namely, the main component forming the tyre tread part is rubber material which has viscoelasticity, and the tyre can bear alternating stress and strain in the rolling process of the tyre, so that the rubber molecular chain is slowly broken to generate permanent deformation, and (3) thermal damage, namely, the rubber has poor heat conducting property, the generated endogenous heat under the alternating stress mostly exists in the rubber material in the form of heat energy, the rubber is thermally decomposed to generate gas at high temperature, the tyre explodes to a certain extent, and the higher temperature also leads to the increase of the flexibility of the rubber molecular chain and the decrease of the tensile strength, modulus and wear resistance of the rubber material, so that the sedimentation of the tyre is increased, and the tread temperature is finally more serious in rolling loss. According to the bench and running experiments of the tire, overheat failure caused by heat generated in the tire is a main factor causing the rubber tire to fail. The contribution of the tread to the total energy loss of the tire is about 60% -70%, so reinforcing the tread material is a major approach to reduce the energy loss of the tire. At present, the low heat generation achievement method of the tire is considered or designed from the directions of a rubber matrix, a filler, resin and the like, and the low heat generation rubber is often accompanied with low strength and low wear resistance, so that the application prospect of the low heat generation rubber is limited. The Chinese patent (publication No. CN102675695B, publication No. 2015.04.01) discloses a rubber composition with low heat generation and low rolling resistance, which is prepared by taking natural rubber as a rubber raw material, taking carbon black or white carbon black as a reinforcing agent and sequentially performing plasticating, mixing and vulcanization processes on the rubber, wherein silicon carbide micro powder is adopted to replace part of the reinforcing agent in the rubber mixing process, and a silane coupling agent is added, and the weight ratio of the rubber raw material, the reinforcing agent, the silicon carbide micro powder and the silane coupling agent in the rubber mixing process is 100 parts of the rubber raw material, 20-45 parts of the carbon black or white carbon black, 5-50 parts of the silicon carbide micro powder and 0.4-2.45 parts of the silane coupling agent, wherein the silicon carbide micro powder is in an alpha or beta crystal form, and the particle size is 0.001-50 mu m. The processability of the rubber compound is improved, the compression heat generation of vulcanized rubber is reduced, the rolling resistance is obviously reduced, and the wet skid resistance is improved. Disclosure of Invention The invention provides a tread rubber composition with low heat generation and a mixing method thereof, aiming at the defects of the prior art. The tread rubber composition is added with the silicon carbide nanowire composite material (NR/SiCnw-SH), so that the tread rubber composition can effectively replace carbon black, reduce internal heat generation of the tread rubber composition and reduce energy loss of a tire. In order to achieve the above purpose, the present invention adopts the following technical scheme: the low-heat-generation tread rubber composition is prepared by mixing the following raw materials in 100 parts by weight: 50.0-70.0 parts of natural rubber, 20.0-40.0 Parts of styrene butadiene rubber, 5.0 To 20.0 parts of butadiene rubber, 20.0-50.0 Parts of carbon bl