Low-rolling-resistance new-energy wide-body tire tread material and preparation method thereof

Abstract

The invention relates to a low-rolling-resistance new-energy wide-body tire tread material and a preparation method thereof, and belongs to the field of tire materials and preparation, and the low-rolling-resistance new-energy wide-body tire tread material is prepared from the following raw materials in parts by weight: a rubber component, white carbon black, whisker composite carbon nanotubes, C5 petroleum resin, stearic acid, naphthenic oil and an anti-aging agent. A tire prepared from the low-rolling-resistance new-energy wide-body tire tread material has excellent wear resistance and low rolling resistance, the comprehensive performance of the tire is optimized, and the service life of the tire is prolonged.

Description

Technical Field

[0001] The present invention belongs to the field of tire materials and preparation thereof, and in particular relates to a low rolling resistance new energy wide-body tire tread material and a preparation method thereof. Background Art

[0002] Compared with traditional fuel vehicles, new energy vehicles have increased vehicle mass, and their power forms and energy replenishment methods have also changed. These differences bring higher performance requirements to the development of tires for new energy vehicles, such as large load capacity, small rolling resistance, and good wear resistance.

[0003] Wide-body tires can enable new energy vehicles to withstand greater loads and have better grip and driving stability, but they will also increase the rolling resistance of the vehicle, affecting the endurance and tire wear performance. In the prior art, the mechanical properties of wide-body tire tread materials can be improved by adding fillers such as white carbon black and carbon nanotubes to enhance and modify the rubber material. However, due to the weak bonding ability and poor dispersibility of the reinforcing material with the rubber matrix, the tire has high hysteresis loss and endogenous heat, which makes it difficult to achieve a more ideal use effect in terms of rolling resistance and wear resistance.

[0004] Therefore, it is of great significance to develop a low rolling resistance tire material suitable for the tread of new energy wide-body tires, so that its rolling resistance and wear resistance can be coordinated with each other and meet the requirements of new energy vehicle tires in terms of high speed, safety, energy saving and environmental protection. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a low rolling resistance new energy wide-body tire tread material and a preparation method thereof.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A low rolling resistance new energy wide-body tire tread material, wherein the raw materials thereof include the following components by weight: 100 parts of a rubber component, 30 to 40 parts of white carbon black, 4 to 6 parts of whisker composite carbon nanotubes, 3 to 5 parts of C5 petroleum resin, 3 to 5 parts of stearic acid, 2 to 3 parts of cyclohexane oil and 0.5 to 1 part of an antioxidant.

[0010] Furthermore, the rubber component is a mixture of butadiene rubber and natural rubber in a mass ratio of 1:1.

[0011] Furthermore, the antioxidant is antioxidant RD and / or antioxidant 4020.

[0012] The preparation of whisker composite carbon nanotubes comprises the following steps:

[0013] Q1. Weigh 1 part of methyltrimethoxysilane by weight, add it to 5-10 parts of 70-85% ethanol aqueous solution, stir evenly, add 0.3-0.5 parts of nitric acid to obtain a mixed solution, stir for 2-3 hours, filter and obtain a siloxane sol;

[0014] Q2, placing the siloxane sol obtained in Q1 in a vacuum drying oven and drying for 4 to 10 hours, with a vacuum degree of 0.5 to 0.8 MPa and a drying temperature of 50 to 80° C., to obtain a siloxane dry glue;

[0015] Q3, spreading the siloxane dry glue obtained in Q2 on graphite paper, folding and wrapping the graphite paper, and then placing it in a graphite can, placing the graphite can in a tubular furnace, continuously introducing nitrogen into the graphite can, heating it to 1400-1500° C., keeping it warm for 2-4 hours, and cooling it to obtain silicon nitride whiskers;

[0016] Q4. The silicon nitride whiskers prepared in Q3 are placed in a tubular furnace. At 600-800°C, ethanol, ethylenediamine and ferrocene are mixed in a mass ratio of 5:10:1 by a floating CVD method and then placed in the tubular furnace to in-situ grow carbon nanotubes on the surface of the silicon nitride whiskers, thereby finally obtaining whisker composite carbon nanotubes.

[0017] Furthermore, the nitrogen flow rate in Q3 is 100-300 mL / min.

[0018] Furthermore, the heating rate in Q3 is 3-10°C / min.

[0019] Furthermore, when the mass ratio of silicon nitride whiskers to whisker-composite carbon nanotubes is 1:1.20-1.30, the growth of carbon nanotubes is stopped.

[0020] A method for preparing a tread material of a new energy wide-body tire with low rolling resistance specifically comprises the following steps:

[0021] S1: weighing raw materials according to weight, adding rubber component, white carbon black, whisker composite carbon nanotubes and C5 petroleum resin into a rubber extruder through a material conveying device, fully plasticizing for 10 to 15 minutes, passing through an extruder flow channel discharge port, and finally spitting out a certain shape of rubber to obtain an extruded rubber, wherein the discharge port extrusion temperature is 110 to 130° C.;

[0022] S2: mixing the extruded rubber material in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, mixing for 5 to 10 minutes and then sheeting to obtain a mixed rubber;

[0023] S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 150-170° C., the pressure is 14-17 MPa, and the vulcanization time is 30-60 min.

[0024] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0025] Carbon nanotubes are one-dimensional nanomaterials with high specific surface area, and have properties such as high strength, high modulus and high thermal conductivity, while silicon nitride whiskers have high toughening ability. The present invention obtains silicon nitride whiskers through a specific preparation method, and obtains in-situ grown carbon nanotubes on the surface of silicon carbide whiskers. This improved method improves the agglomeration phenomenon of carbon nanotubes. The composite use of carbon nanotubes and silicon nitride whiskers achieves a good strengthening and toughening effect, and greatly improves the rolling resistance and wear resistance of tires.

[0026] When the rubber tire is in use, due to the support of the silicon nitride whiskers, when axial pressure is applied, the carbon nanotubes will not break even if they bend at a large angle. When the external force is released, the carbon nanotubes return to their original shape, thereby avoiding high hysteresis losses and reducing the rolling resistance of the tire. At the same time, the carbon nanotubes and silicon nitride whiskers can build a complete thermal conductivity network system to dissipate heat in a timely and effective manner, avoiding friction losses of the tire at high temperatures and improving the wear resistance of the tire.

[0027] The present invention provides a low rolling resistance new energy wide-body tire tread material, which adopts a special formula and related improvement measures to reduce the rolling resistance of the tire while maintaining good wear resistance, achieving a relatively ideal reinforcement effect, thereby improving the service life and comprehensive performance of the tire. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] A low rolling resistance new energy wide-body tire tread material, whose raw materials include the following components by weight: 100 parts of rubber component, 35 parts of white carbon black, 5 parts of whisker composite carbon nanotubes, 5 parts of C5 petroleum resin, 5 parts of stearic acid, 2.5 parts of cyclohexane oil, and 0.5 parts of antioxidant.

[0031] The rubber component is a mixture of butadiene rubber and natural rubber in a mass ratio of 1:1.

[0032] The antioxidant is antioxidant RD.

[0033] A method for preparing whisker composite carbon nanotubes in a tread material of a new energy wide-body tire with low rolling resistance comprises the following steps:

[0034] Q1. Weigh 1 part of methyltrimethoxysilane by weight, add it to 8 parts of 80% ethanol aqueous solution, stir evenly, add 0.4 parts of nitric acid to obtain a mixed solution, stir for 2 to 3 hours, filter and obtain a siloxane sol;

[0035] Q2, the siloxane sol obtained in Q1 was placed in a vacuum drying oven and dried for 8 hours at a vacuum degree of 0.6 MPa and a drying temperature of 65°C to obtain siloxane dry glue;

[0036] Q3, spreading the siloxane dry glue obtained in Q2 on graphite paper, folding and wrapping the graphite paper, and then placing it in a graphite can, placing the graphite can in a tube furnace, continuously passing nitrogen into the graphite can, the nitrogen flow rate is 200mL / min, and heating to 1450°C at a rate of 5°C / min, keeping the temperature for 3h, and cooling to obtain silicon nitride whiskers;

[0037] Q4. The silicon nitride whiskers prepared in Q3 are placed in a tubular furnace. At 700°C, ethanol, ethylenediamine and ferrocene are mixed in a mass ratio of 5:10:1 by a floating CVD method and then placed in the tubular furnace to in-situ grow carbon nanotubes on the surface of the silicon nitride whiskers to finally obtain whisker composite carbon nanotubes. The growth ends when the mass ratio of the silicon nitride whiskers to the whisker composite carbon nanotubes is 1:1.25.

[0038] A method for preparing a tread material of a new energy wide-body tire with low rolling resistance specifically comprises the following steps:

[0039] S1: weighing raw materials according to weight, adding rubber component, white carbon black, whisker composite carbon nanotubes and C5 petroleum resin into a rubber extruder through a material conveying device, fully plasticizing for 10 minutes, passing through an extruder flow channel outlet, and finally spitting out a certain shape of rubber to obtain an extruded rubber, wherein the extrusion temperature of the outlet is 120°C;

[0040] S2: mixing the extruded rubber in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, and mixing for 10 minutes before sheeting to obtain a mixed rubber;

[0041] S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 160° C., the pressure is 15 MPa, and the vulcanization time is 30 min.

[0042] Example 2

[0043] A low rolling resistance new energy wide-body tire tread material, whose raw materials include the following components by weight: 100 parts of rubber components, 30 parts of white carbon black, 4 parts of whisker composite carbon nanotubes, 3 parts of C5 petroleum resin, 3-5 parts of stearic acid, 2 parts of cyclohexane oil, and 0.5 parts of antioxidant.

[0044] The rubber component is a mixture of butadiene rubber and natural rubber in a mass ratio of 1:1.

[0045] The antioxidant is antioxidant 4020.

[0046] A method for preparing whisker composite carbon nanotubes in a tread material of a new energy wide-body tire with low rolling resistance comprises the following steps:

[0047] Q1. Weigh 1 part of methyltrimethoxysilane by weight, add it to 5 parts of 70% ethanol aqueous solution, stir evenly, add 0.3 parts of nitric acid to obtain a mixed solution, stir for 2 hours, filter and obtain a siloxane sol;

[0048] Q2, the siloxane sol obtained in Q1 was placed in a vacuum drying oven and dried for 4 hours at a vacuum degree of 0.5 MPa and a drying temperature of 50°C to obtain siloxane dry glue;

[0049] Q3, spreading the siloxane dry glue obtained in Q2 on graphite paper, folding and wrapping the graphite paper, and then placing it in a graphite can, placing the graphite can in a tubular furnace, continuously passing nitrogen into the graphite can, the nitrogen flow rate is 100 mL / min, and heating to 1400°C at a rate of 3°C / min, keeping the temperature for 2 hours, and cooling to obtain silicon nitride whiskers;

[0050] Q4. The silicon nitride whiskers prepared in Q3 are placed in a tubular furnace. At 600°C, ethanol, ethylenediamine and ferrocene are mixed in a mass ratio of 5:10:1 by a floating CVD method and then placed in the tubular furnace to in-situ grow carbon nanotubes on the surface of the silicon nitride whiskers to finally obtain whisker composite carbon nanotubes. The growth ends when the mass ratio of the silicon nitride whiskers to the whisker composite carbon nanotubes is 1:1.20.

[0051] A method for preparing a tread material of a new energy wide-body tire with low rolling resistance specifically comprises the following steps:

[0052] S1: weighing raw materials according to weight, adding rubber component, white carbon black, whisker composite carbon nanotubes and C5 petroleum resin into a rubber extruder through a material conveying device, fully plasticizing for 10 minutes, passing through an extruder flow channel discharge port, and finally spitting out a certain shape of rubber to obtain an extruded rubber, wherein the discharge port extrusion temperature is 110°C;

[0053] S2: mixing the extruded rubber in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, and mixing for 5 minutes before sheeting to obtain a mixed rubber;

[0054] S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 150° C., the pressure is 14 MPa, and the vulcanization time is 30 min.

[0055] Example 3

[0056] A low rolling resistance new energy wide-body tire tread material, whose raw materials include the following components by weight: 100 parts of rubber components, 40 parts of white carbon black, 6 parts of whisker composite carbon nanotubes, 5 parts of C5 petroleum resin, 5 parts of stearic acid, 3 parts of cyclohexane oil, and 1 part of antioxidant.

[0057] The rubber component is a mixture of butadiene rubber and natural rubber in a mass ratio of 1:1.

[0058] The antioxidant is a mixture of antioxidant RD and antioxidant 4020 in a mass ratio of 1:1.

[0059] A method for preparing whisker composite carbon nanotubes in a tread material of a new energy wide-body tire with low rolling resistance comprises the following steps:

[0060] Q1. Weigh 1 part of methyltrimethoxysilane by weight, add it to 10 parts of 85% ethanol aqueous solution, stir evenly, add 0.5 parts of nitric acid to obtain a mixed solution, stir for 3 hours, filter and obtain a siloxane sol;

[0061] Q2, the siloxane sol obtained in Q1 was placed in a vacuum drying oven and dried for 10 hours at a vacuum degree of 0.8 MPa and a drying temperature of 80°C to obtain siloxane dry glue;

[0062] Q3, spreading the siloxane dry glue obtained in Q2 on graphite paper, folding and wrapping the graphite paper, and then placing it in a graphite can, placing the graphite can in a tubular furnace, continuously passing nitrogen into the graphite can, the nitrogen flow rate is 300 mL / min, and heating to 1500° C. at a rate of 10° C. / min, keeping the temperature for 4 hours, and cooling to obtain silicon nitride whiskers;

[0063] Q4. The silicon nitride whiskers prepared in Q3 are placed in a tubular furnace. At 800°C, ethanol, ethylenediamine and ferrocene are mixed in a mass ratio of 5:10:1 by a floating CVD method and then placed in the tubular furnace to in-situ grow carbon nanotubes on the surface of the silicon nitride whiskers to finally obtain whisker composite carbon nanotubes. The growth ends when the mass ratio of the silicon nitride whiskers to the whisker composite carbon nanotubes is 1:1.30.

[0064] A method for preparing a tread material of a new energy wide-body tire with low rolling resistance specifically comprises the following steps:

[0065] S1: weighing raw materials according to weight, adding rubber component, white carbon black, whisker composite carbon nanotubes and C5 petroleum resin into a rubber extruder through a material conveying device, fully plasticizing for 15 minutes, passing through an extruder flow channel outlet, and finally spitting out a certain shape of rubber to obtain an extruded rubber, wherein the extrusion temperature at the outlet is 130°C;

[0066] S2: mixing the extruded rubber in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, and mixing for 10 minutes before sheeting to obtain a mixed rubber;

[0067] S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 170°C, the pressure is 17 MPa, and the vulcanization time is 60 min.

[0068] Example 4

[0069] A low rolling resistance new energy wide-body tire tread material, wherein the raw materials thereof include the following components by weight: 100 parts of rubber component, 32 parts of white carbon black, 4.5 parts of whisker composite carbon nanotubes, 3.5 parts of C5 petroleum resin, 3.5 parts of stearic acid, 2.3 parts of cyclohexane oil, and 0.6 parts of antioxidant.

[0070] The rubber component is a mixture of butadiene rubber and natural rubber in a mass ratio of 1:1.

[0071] The antioxidant is antioxidant RD.

[0072] A method for preparing whisker composite carbon nanotubes in a tread material of a new energy wide-body tire with low rolling resistance comprises the following steps:

[0073] Q1. Weigh 1 part of methyltrimethoxysilane by weight, add it to 6 parts of 75% ethanol aqueous solution, stir evenly, add 0.3-0.5 parts of nitric acid to obtain a mixed solution, stir for 2-3 hours, filter and obtain a siloxane sol;

[0074] Q2, the siloxane sol obtained in Q1 was placed in a vacuum drying oven and dried for 5 hours at a vacuum degree of 0.6 MPa and a drying temperature of 56°C to obtain siloxane dry glue;

[0075] Q3, spreading the siloxane dry glue obtained in Q2 on graphite paper, folding and wrapping the graphite paper, and then placing it in a graphite can, placing the graphite can in a tubular furnace, continuously passing nitrogen into the graphite can, the nitrogen flow rate is 150mL / min, and heating to 1430°C at a rate of 4°C / min, keeping warm for 2.5h, and cooling to obtain silicon nitride whiskers;

[0076] Q4. The silicon nitride whiskers prepared in Q3 are placed in a tubular furnace. At 650°C, ethanol, ethylenediamine and ferrocene are mixed in a mass ratio of 5:10:1 by a floating CVD method and then placed in the tubular furnace to in-situ grow carbon nanotubes on the surface of the silicon nitride whiskers to finally obtain whisker composite carbon nanotubes. The growth ends when the mass ratio of the silicon nitride whiskers to the whisker composite carbon nanotubes is 1:1.23.

[0077] A method for preparing a tread material of a new energy wide-body tire with low rolling resistance specifically comprises the following steps:

[0078] S1: weighing raw materials according to weight, adding rubber component, white carbon black, whisker composite carbon nanotubes and C5 petroleum resin into a rubber extruder through a material conveying device, fully plasticizing for 12 minutes, passing through an extruder flow channel outlet, and finally spitting out a certain shape of rubber to obtain an extruded rubber, wherein the extrusion temperature at the outlet is 115°C;

[0079] S2: mixing the extruded rubber in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, and mixing for 6 minutes before sheeting to obtain a mixed rubber;

[0080] S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 155°C, the pressure is 15MPa, and the vulcanization time is 40min.

[0081] Example 5

[0082] A low rolling resistance new energy wide-body tire tread material, wherein the raw materials thereof include the following components in parts by weight: 100 parts of a rubber component, 38 parts of white carbon black, 5.5 parts of whisker composite carbon nanotubes, 4.5 parts of C5 petroleum resin, 4.5 parts of stearic acid, 2.8 parts of cyclohexane oil, and 0.9 parts of an antioxidant.

[0083] The rubber component is a mixture of butadiene rubber and natural rubber in a mass ratio of 1:1.

[0084] The antioxidant is antioxidant RD.

[0085] A method for preparing whisker composite carbon nanotubes in a tread material of a new energy wide-body tire with low rolling resistance comprises the following steps:

[0086] Q1. Weigh 1 part of methyltrimethoxysilane by weight, add it to 9 parts of 84% ethanol aqueous solution, stir evenly, add 0.45 parts of nitric acid to obtain a mixed solution, stir for 2.8 hours, filter and obtain a siloxane sol;

[0087] Q2, the siloxane sol obtained in Q1 was placed in a vacuum drying oven and dried for 9 hours at a vacuum degree of 0.75 MPa and a drying temperature of 75°C to obtain siloxane dry glue;

[0088] Q3, spreading the siloxane dry glue obtained in Q2 on graphite paper, folding and wrapping the graphite paper, and then placing it in a graphite can, placing the graphite can in a tubular furnace, continuously passing nitrogen into the graphite can at a nitrogen flow rate of 250 mL / min, and heating to 1480°C at a rate of 8°C / min, keeping the temperature for 3.5 hours, and cooling to obtain silicon nitride whiskers;

[0089] Q4. The silicon nitride whiskers prepared in Q3 are placed in a tubular furnace. At 750°C, ethanol, ethylenediamine and ferrocene are mixed in a mass ratio of 5:10:1 by a floating CVD method and then placed in the tubular furnace to in-situ grow carbon nanotubes on the surface of the silicon nitride whiskers to finally obtain whisker composite carbon nanotubes. The growth ends when the mass ratio of silicon nitride whiskers to whisker composite carbon nanotubes is 1:1.28.

[0090] A method for preparing a tread material of a new energy wide-body tire with low rolling resistance specifically comprises the following steps:

[0091] S1: weighing raw materials according to weight, adding rubber component, white carbon black, whisker composite carbon nanotubes and C5 petroleum resin into a rubber extruder through a material conveying device, fully plasticizing for 14 minutes, passing through an extruder flow channel outlet, and finally spitting out a certain shape of rubber to obtain an extruded rubber, wherein the extrusion temperature of the outlet is 125°C;

[0092] S2: mixing the extruded rubber in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, and mixing for 9 minutes before sheeting to obtain a mixed rubber;

[0093] S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 165°C, the pressure is 16.5MPa, and the vulcanization time is 55min.

[0094] Comparative Example 1

[0095] The only difference from Example 1 is that in the preparation of a low rolling resistance new energy wide-body tire tread material, the whisker composite carbon nanotubes are replaced by silicon nitride whiskers.

[0096] A low rolling resistance new energy wide-body tire tread material, wherein the raw materials thereof include the following components in parts by weight: 100 parts of a rubber component, 35 parts of white carbon black, 5 parts of silicon nitride whiskers, 5 parts of C5 petroleum resin, 5 parts of stearic acid, 2.5 parts of cyclohexane oil, and 0.5 parts of an antioxidant.

[0097] A method for preparing silicon nitride whiskers in a tread material of a new energy wide-body tire with low rolling resistance comprises the following steps:

[0098] Q1. Weigh 1 part of methyltrimethoxysilane by weight, add it to 8 parts of 80% ethanol aqueous solution, stir evenly, add 0.4 parts of nitric acid to obtain a mixed solution, stir for 2 to 3 hours, filter and obtain a siloxane sol;

[0099] Q2, the siloxane sol obtained in Q1 was placed in a vacuum drying oven and dried for 8 hours at a vacuum degree of 0.6 MPa and a drying temperature of 65°C to obtain siloxane dry glue;

[0100] Q3. Spread the siloxane dry glue obtained in Q2 on graphite paper, fold and wrap the graphite paper, and then place it in a graphite can. Place the graphite can in a tubular furnace, continuously introduce nitrogen into the graphite can at a rate of 200 mL / min, and heat to 1450°C at a rate of 5°C / min, keep warm for 3 hours, and cool to obtain silicon nitride whiskers.

[0101] A method for preparing a tread material of a new energy wide-body tire with low rolling resistance specifically comprises the following steps:

[0102] S1: weighing raw materials according to weight, adding rubber component, white carbon black, silicon nitride whisker and C5 petroleum resin into a rubber extruder through a material conveying device, fully plasticizing for 10 minutes, passing through the extruder flow channel discharge port, and finally spitting out a certain shape of rubber to obtain an extruded rubber, wherein the discharge port extrusion temperature is 120°C;

[0103] S2: mixing the extruded rubber in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, and mixing for 10 minutes before sheeting to obtain a mixed rubber;

[0104] S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 160° C., the pressure is 15 MPa, and the vulcanization time is 30 min.

[0105] Comparative Example 2

[0106] The only difference from Example 1 is that the whisker composite carbon nanotubes are replaced by carbon nanotubes.

[0107] A low rolling resistance new energy wide-body tire tread material, wherein the raw materials thereof include the following components in parts by weight: 100 parts of rubber components, 35 parts of white carbon black, 5 parts of carbon nanotubes, 5 parts of C5 petroleum resin, 5 parts of stearic acid, 2.5 parts of cyclohexane oil, and 0.5 parts of antioxidant.

[0108] A method for preparing a tread material of a new energy wide-body tire with low rolling resistance specifically comprises the following steps:

[0109] S1: weighing raw materials according to weight, adding rubber component, white carbon black, carbon nanotubes and C5 petroleum resin into a rubber extruder through a material conveying device, fully plasticizing for 10 minutes, passing through the extruder flow channel discharge port, and finally spitting out a certain shape of rubber to obtain an extruded rubber, wherein the discharge port extrusion temperature is 120°C;

[0110] S2: mixing the extruded rubber in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, and mixing for 10 minutes before sheeting to obtain a mixed rubber;

[0111] S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 160° C., the pressure is 15 MPa, and the vulcanization time is 30 min.

[0112] Comparative Example 3

[0113] The only difference from Example 1 is that whisker composite carbon nanotubes are not added in the preparation of a low rolling resistance new energy wide-body tire tread material.

[0114] A low rolling resistance new energy wide-body tire tread material, wherein the raw materials thereof include the following components in parts by weight: 100 parts of rubber components, 35 parts of white carbon black, 5 parts of C5 petroleum resin, 5 parts of stearic acid, 2.5 parts of cyclohexane oil, and 0.5 parts of antioxidant.

[0115] A method for preparing a tread material of a new energy wide-body tire with low rolling resistance specifically comprises the following steps:

[0116] S1: weigh the raw materials according to the weight, add the rubber component, white carbon black and C5 petroleum resin into the rubber extruder through the material conveying device, fully plasticize for 10 minutes, pass through the extruder flow channel discharge port, and finally spit out a certain shape of rubber to obtain an extruded rubber, wherein the discharge port extrusion temperature is 120°C;

[0117] S2: mixing the extruded rubber in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, and mixing for 10 minutes before sheeting to obtain a mixed rubber;

[0118] S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 160° C., the pressure is 15 MPa, and the vulcanization time is 30 min.

[0119] Comparative Example 4

[0120] The only difference from Example 1 is that in the preparation of the whisker composite carbon nanotubes, the silicon nitride whiskers and the carbon nanotubes are simply mixed without in-situ growth.

[0121] A method for preparing whisker composite carbon nanotubes in a tread material of a new energy wide-body tire with low rolling resistance comprises the following steps:

[0122] Q1. Weigh 1 part of methyltrimethoxysilane by weight, add it to 8 parts of 80% ethanol aqueous solution, stir evenly, add 0.4 parts of nitric acid to obtain a mixed solution, stir for 2 to 3 hours, filter and obtain a siloxane sol;

[0123] Q2, the siloxane sol obtained in Q1 was placed in a vacuum drying oven and dried for 8 hours at a vacuum degree of 0.6 MPa and a drying temperature of 65°C to obtain siloxane dry glue;

[0124] Q3, spreading the siloxane dry glue obtained in Q2 on graphite paper, folding and wrapping the graphite paper, and then placing it in a graphite can, placing the graphite can in a tube furnace, continuously passing nitrogen into the graphite can, the nitrogen flow rate is 200mL / min, and heating to 1450°C at a rate of 5°C / min, keeping the temperature for 3h, and cooling to obtain silicon nitride whiskers;

[0125] Q4. The silicon nitride whiskers prepared in Q3 are mixed with carbon nanotubes and placed in a tubular furnace. After the reaction is completed at 700°C, whisker composite carbon nanotubes are obtained. The mass ratio of silicon nitride whiskers to whisker composite carbon nanotubes is 1:1.25.

[0126] Performance Test:

[0127] 1. Rolling resistance: The rolling resistance of vulcanized rubber is characterized by the index of 60°C Tanδ. The smaller the value, the lower the rolling resistance.

[0128] 2. Wear resistance: Based on the wear resistance of rubber measured by DIN abrasion in GB / T9867-2008, where the contact pressure is 10N. The smaller the value, the better the wear resistance.

[0129] The above performance test results are shown in Table 1.

[0130] Table 1

[0131]

[0132]

[0133] It can be seen from Examples 1 to 5 combined with the data in Table 1 that the tire made of the low rolling resistance new energy wide-body tire tread material prepared by the technical solution of the present invention has smaller rolling resistance and excellent wear resistance.

[0134] From the data in Table 1, it can be seen that the rolling resistance of the tire prepared with the low rolling resistance new energy wide body tire tread material of Comparative Example 1 is 0.084, which is significantly greater than the rolling resistance of the tire prepared with the low rolling resistance new energy wide body tire tread material of Example 1, which is 0.071. The DIN 206.2% obtained by the tire prepared with the low rolling resistance new energy wide body tire tread material of Comparative Example 1 is significantly greater than the DIN 183.7% obtained by the tire prepared with the low rolling resistance new energy wide body tire tread material of Example 1. In Table 1, the rolling resistance of Comparative Example 2 is 0.093, which is greater than the corresponding data of Example 1, which is 0.071. The DIN 214.6% of Comparative Example 2 is greater than the corresponding data of Example 1, which is 183.7%.

[0135] Combining the contents of Comparative Example 1, Comparative Example 2 and Example 1 and Table 1, it can be clearly seen that the use of carbon nanotubes and silicon nitride whiskers alone does not have the excellent rolling force and wear resistance of the tire prepared when the two are present at the same time.

[0136] The rolling resistance of the tire prepared with the low rolling resistance new energy wide body tire tread material of Comparative Example 3 is greater than the rolling resistance of the tire prepared with the low rolling resistance new energy wide body tire tread material of Example 1. The DIN of the tire prepared with the low rolling resistance new energy wide body tire tread material of Comparative Example 3 is significantly greater than that of Example 1, proving that the addition of whisker composite carbon nanotubes can improve the wear resistance and reduce the rolling resistance of the tire prepared with the low rolling resistance new energy wide body tire tread material.

[0137] The tested rolling resistance and DIN of the tire made of the low rolling resistance new energy wide body tire tread material of Comparative Example 4 are significantly greater than the corresponding data in Table 1 of Comparative Example 1 and Comparative Example 2. Combined with the contents and test results in Comparative Example 3 and Example 1, it is proved that silicon nitride whiskers and carbon nanotubes in situ grown on the surface of silicon nitride whiskers have a synergistic effect in improving the wear resistance and reducing the rolling resistance of tires made of low rolling resistance new energy wide body tire tread materials.

[0138] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low rolling resistance new energy wide-body tire tread material, characterized by: The raw materials include the following components by weight: 100 parts of rubber component, 30-40 parts of white carbon black, 4-6 parts of whisker composite carbon nanotubes, 3-5 parts of C5 petroleum resin, 3-5 parts of stearic acid, 2-3 parts of cyclohexane oil and 0.5-1 part of antioxidant.

2. The low rolling resistance new energy wide-body tire tread material according to claim 1, characterized in that: The rubber component is a mixture of butadiene rubber and natural rubber in a mass ratio of 1:

1.

3. The low rolling resistance new energy wide-body tire tread material according to claim 1, characterized in that: The antioxidant is antioxidant RD and / or antioxidant 4020.

4. The low rolling resistance new energy wide-body tire tread material according to any one of claims 1 to 3, characterized in that: The preparation of whisker composite carbon nanotubes comprises the following steps: Q1. Weigh 1 part of methyltrimethoxysilane by weight, add it to 5-10 parts of 70-85% ethanol aqueous solution, stir evenly, add 0.3-0.5 parts of nitric acid to obtain a mixed solution, stir for 2-3 hours, filter and obtain a siloxane sol; Q2, placing the siloxane sol obtained in Q1 in a vacuum drying oven and drying for 4 to 10 hours, with a vacuum degree of 0.5 to 0.8 MPa and a drying temperature of 50 to 80° C., to obtain a siloxane dry glue; Q3, spreading the siloxane dry glue obtained in Q2 on graphite paper, folding and wrapping the graphite paper, and then placing it in a graphite can, placing the graphite can in a tubular furnace, continuously introducing nitrogen into the graphite can, heating it to 1400-1500° C., keeping it warm for 2-4 hours, and cooling it to obtain silicon nitride whiskers; Q4. The silicon nitride whiskers prepared in Q3 are placed in a tubular furnace. At 600-800°C, ethanol, ethylenediamine and ferrocene are mixed in a mass ratio of 5:10:1 by a floating CVD method and then placed in the tubular furnace to in-situ grow carbon nanotubes on the surface of the silicon nitride whiskers, thereby finally obtaining whisker composite carbon nanotubes.

5. The low rolling resistance new energy wide-body tire tread material according to claim 4, characterized in that: The nitrogen flow rate in Q3 is 100-300 mL / min.

6. The low rolling resistance new energy wide-body tire tread material according to claim 4, characterized in that: The heating rate in Q3 is 3-10°C / min.

7. The low rolling resistance new energy wide-body tire tread material according to claim 4, characterized in that: When the mass ratio of silicon nitride whiskers to whisker-composite carbon nanotubes is 1:1.20-1.30, the growth of carbon nanotubes is stopped.

8. A method for preparing a low rolling resistance new energy wide-body tire tread material according to any one of claims 1 to 7, comprising the following steps: S1: weighing raw materials according to weight, adding rubber component, white carbon black, whisker composite carbon nanotubes and C5 petroleum resin into a rubber extruder through a material conveying device, fully plasticizing for 10 to 15 minutes, passing through an extruder flow channel discharge port, and finally spitting out a certain shape of rubber to obtain an extruded rubber, wherein the discharge port extrusion temperature is 110 to 130° C.; S2: mixing the extruded rubber material in an internal mixer, adding stearic acid, cyclohexane oil and antioxidant in sequence during the mixing process, mixing for 5 to 10 minutes and then sheeting to obtain a mixed rubber; S3. Vulcanize the rubber mixture obtained in S2 using a steam flat vulcanizer to obtain a low rolling resistance new energy wide-body tire tread material; wherein the vulcanization temperature is 150-170° C., the pressure is 14-17 MPa, and the vulcanization time is 30-60 min.

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