Formula of high-conductivity low-rolling-resistance tread base rubber for car tire and preparation method of high-conductivity low-rolling-resistance tread base rubber
By using conductive carbon black with developed structure instead of expensive materials, combined with specific refining processes, the problems of high-conductivity and high-performance tires are solved, and high conductivity, low rolling resistance and excellent wetland braking performance are achieved.
Patent Information
- Application Number
- CN202510204296.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-05-13
AI Technical Summary
When manufacturing highly conductive and high-performance tires, the prior art has high cost and complex processes, making it difficult to meet the requirements of conductivity, wetland braking performance and rolling resistance at the same time.
Using highly developed conductive carbon black instead of expensive carbon nanotubes or graphene, a formula of high-conductive, low-roll resistance tread base glue for car tires is prepared, and the manufacturing process is simplified through a specific refining process.
It achieves high conductivity, low rolling resistance and excellent wetland braking performance, while reducing production costs, simplifying process flow, and solving the problems of high-conductive high-performance tire manufacturing costs and complex manufacturing processes.
Smart Images
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Figure BDA0005284080380000072
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of rubber tires, and in particular to a formula of a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire and a preparation method thereof. Background Art
[0002] With the rapid development of social economy and the rapid expansion of demand for transportation facilities, people have an increasing demand for automobile tires and higher performance requirements for tires. At present, the tire market has higher performance requirements for wet braking performance and rolling resistance performance of tires, which increases the use of white carbon black in tires. However, this will also cause the conductivity of the tire tread rubber to deteriorate, making the tire prone to static electricity, and it is difficult to achieve both performance. Therefore, when producing high-performance tires, different formulations of base rubber and chimney rubber are generally required to achieve low rolling resistance and conductivity at the same time. However, this will lead to complex processes, large equipment investment, and high production costs.
[0003] In pursuit of lower rolling resistance, people have not only made extreme improvements to the tread rubber, but also to the tread base rubber, using expensive carbon nanotubes or graphene to simultaneously meet the requirements of high conductivity and low hysteresis loss, thereby improving product performance and obtaining products that meet market demand. However, this not only increases the overall cost of the tire, but also complicates the mixing process, makes it difficult to disperse the filler, and increases the difficulty of manufacturing.
[0004] It can be seen that the current technology is costly and complex in manufacturing high-conductivity, high-performance (wet braking performance, low rolling resistance, low hysteresis) tires.
[0005] Therefore, in view of the shortcomings of the above-mentioned scheme in actual production and implementation, it has been revised and improved. At the same time, in the spirit and concept of seeking excellence, with the assistance of professional knowledge and experience, and after many ingenuity and experiments, a formula of high-conductivity and low-rolling resistance tread base rubber for passenger car tires and a preparation method thereof are provided to solve the technical problems of high manufacturing cost and complex manufacturing process of high-conductivity and high-performance tires. Summary of the invention
[0006] The purpose of the present invention is to provide a formula of a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire and a preparation method thereof, so as to solve the technical problems of high manufacturing cost and complex manufacturing process of high-conductivity and high-performance tires.
[0007] In order to meet the requirements of conductivity and tire performance (wet braking performance and rolling resistance, etc.) while taking into account the cost, the present invention uses conductive carbon black instead of expensive materials to prepare a high-conductivity and low-rolling-resistance tread base rubber for passenger car tires.
[0008] The technical solution of the present invention is achieved in this way:
[0009] A formula of a high-conductivity, low-rolling-resistance tread base rubber for a passenger car tire comprises the following components in parts by weight: 70-86 parts of natural rubber, 14-30 parts of butadiene rubber, 35-55 parts of conductive carbon black, 2-4 parts of zinc oxide, 1-2 parts of stearic acid, 3-5 parts of an antioxidant, 1.8-2.2 parts of an accelerator, 0.1-0.2 parts of a scorch retarder, and 1.6-2.8 parts of sulfur, wherein the total parts of the natural rubber and butadiene rubber are 100 parts.
[0010] As a preferred embodiment, conductive carbon black with a higher DBP oil absorption value (detection method GB / T3780.2) is used, and the DBP oil absorption value of the conductive carbon black is in the range of 120±8ml / 100g and the iodine absorption value (GB / T3780.1) is in the range of 55±5mg / g.
[0011] The above conductive carbon black has a very high specific surface area and a well-developed structure.
[0012] As a preferred embodiment, the natural rubber is hemp natural rubber, and the butadiene rubber is neodymium-based high-cis butadiene rubber.
[0013] As a preferred embodiment, the antioxidant is two or three of the antioxidant TMQ, antioxidant 6PPD, antioxidant DTPD, and microcrystalline wax;
[0014] The melting point of microcrystalline wax is above 75°C.
[0015] As a preferred embodiment, the sulfur is heat-stable insoluble sulfur with an oil content of 20%, and the insoluble sulfur content is more than 75% at 105°C.
[0016] As a preferred embodiment, the accelerator is any one of accelerator DM and accelerator CBS, or a combination of both.
[0017] As a preferred embodiment, the anti-scorch agent is anti-scorch agent CTP.
[0018] A method for preparing a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire comprises the following steps:
[0019] S1 Masterbatch Production:
[0020] Add natural rubber, butadiene rubber, conductive carbon black, antioxidant, zinc oxide and stearic acid to the internal mixer in sequence, press the top bolt for 40 seconds, the top bolt pressure is 0.4Mpa-0.6Mpa, the bolt is raised for 10 seconds, the top bolt is pressed for 40 seconds, the mixing temperature is 125°C, the speed is 40rpm-45rpm, the bolt is raised for 10 seconds, the top bolt is pressed, the mixing temperature rises to 155°C, and the rubber is discharged;
[0021] S2 final rubber production:
[0022] Add masterbatch, accelerator DM and accelerator CBS, anti-scorch agent CTP and sulfur to the internal mixer, set the speed to 30rpm-45rpm, press the top bolt for 35s, the pressure of the top bolt is 0.4Mpa-0.6Mpa, after the bolt is raised for 10s, press the top bolt for 35s, raise the bolt for 10s, press the top bolt, the mixing temperature rises to 105℃, increase the speed to 50rpm, and discharge the rubber.
[0023] The beneficial effects of this program are:
[0024] This formula uses conductive carbon black with a well-developed structure to replace expensive materials such as carbon nanotubes and graphene. Using this formula to manufacture tire rubber can simultaneously meet the conductivity, wet braking and rolling resistance requirements of the tire, while reducing costs and improving processing technology, solving the technical problems of high manufacturing costs and complex manufacturing processes for high-conductivity and high-performance tires.
[0025] In terms of production cost, the present invention can significantly reduce the production cost of tires. Taking a semi-steel factory with an annual output of 10 million sets as an example, the annual cost savings can reach more than 2 million yuan.
[0026] In terms of processing technology, this solution improves the internal mixing process and tread extrusion processing technology in the following ways: on the one hand, the base rubber and the chimney rubber use the same formula, so the feeding screw can be saved, and the extruder is simplified from four-screw feeding to three-screw feeding, simplifying the extrusion process; on the other hand, conductive carbon black is easier to disperse than carbon nanotubes and graphene, so the internal mixing time is shortened, which is equivalent to simplifying the internal mixing process. DETAILED DESCRIPTION
[0027] In actual production, conductive carbon black can use products from Jiangxi Black Cat or Shanxi Yongdong. Both have high DBP oil absorption values (test method GB / T3780.2). The DBP oil absorption value range is 120±8ml / 100g. The iodine absorption value (GB / T3780.1) ranges from 55±5mg / g.
[0028] The natural rubber is made of trifoliate natural rubber, and the butyl rubber is neodymium-based high-cis butyl rubber, which can be CB25, GND45, BR54, etc.
[0029] The present application is further described in detail below in conjunction with embodiments and comparative examples.
[0030] Source of raw materials: The raw materials used in the examples and comparative examples can be purchased commercially.
[0031] Embodiment 1:
[0032] A high-conductivity and low-rolling-resistance tread base rubber formula for passenger car tires, comprising the following components in parts by weight: 75 parts of natural rubber, 25 parts of butadiene rubber, 40 parts of conductive carbon black (a product of Black Cat), 3 parts of zinc oxide, 1.5 parts of stearic acid, 5 parts of antioxidant, 1.5 parts of accelerator, 0.15 parts of anti-scorch agent, and 2.5 parts of sulfur.
[0033] The method for preparing a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire in this embodiment comprises the following steps:
[0034] S1 Masterbatch Production
[0035] Add natural rubber, cis-1,4-butadiene rubber, conductive carbon black, antioxidant, zinc oxide and stearic acid to the internal mixer in sequence. Press the top bolt for 40 seconds, the top bolt pressure is 0.4-0.6Mpa, the bolt stays for 10 seconds, the top bolt is pressed for 40 seconds, the mixing temperature is 125℃, the speed is 40-45rpm, the bolt stays for 10 seconds, the top bolt is pressed, the mixing temperature rises to 155℃, and the rubber is discharged.
[0036] S2 Final Rubber Production
[0037] Add masterbatch, accelerators DM and CBS, anti-scorch agent CTP and sulfur to the internal mixer, set the speed to 30-45rpm, press the top bolt for 35s, the pressure of the top bolt is 0.4-0.6Mpa, after the bolt is raised for 10s, press the top bolt for 35s, the bolt is raised for 10s, press the top bolt, the mixing temperature rises to 105℃, the speed is increased to 50rpm, and the rubber is discharged.
[0038] Embodiment 2:
[0039] A high-conductivity and low-rolling-resistance tread base rubber formula for passenger car tires, comprising the following components in parts by weight: 75 parts of natural rubber, 25 parts of butadiene rubber, 45 parts of conductive carbon black (a product of Black Cat), 3 parts of zinc oxide, 1.5 parts of stearic acid, 5 parts of antioxidant, 1.5 parts of accelerator, 0.15 parts of anti-scorch agent, and 2.5 parts of sulfur.
[0040] The method for preparing a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire in this embodiment comprises the following steps:
[0041] S1 Masterbatch Production
[0042] Add natural rubber, cis-1,4-butadiene rubber, conductive carbon black, antioxidant, zinc oxide and stearic acid to the internal mixer in sequence. Press the top bolt for 40 seconds, the top bolt pressure is 0.4-0.6Mpa, the bolt stays for 10 seconds, the top bolt is pressed for 40 seconds, the mixing temperature is 125℃, the speed is 40-45rpm, the bolt stays for 10 seconds, the top bolt is pressed, the mixing temperature rises to 155℃, and the rubber is discharged.
[0043] S2 Final Rubber Production
[0044] Add masterbatch, accelerators DM and CBS, anti-scorch agent CTP and sulfur to the internal mixer, set the speed to 30-45rpm, press the top bolt for 35s, the pressure of the top bolt is 0.4-0.6Mpa, after the bolt is raised for 10s, press the top bolt for 35s, the bolt is raised for 10s, press the top bolt, the mixing temperature rises to 105℃, the speed is increased to 50rpm, and the rubber is discharged.
[0045] Embodiment 3:
[0046] A high-conductivity and low-rolling-resistance tread base rubber formula for passenger car tires, comprising the following components in parts by weight: 75 parts of natural rubber, 25 parts of butadiene rubber, 40 parts of conductive carbon black (a product of Yongdong), 3 parts of zinc oxide, 1.5 parts of stearic acid, 5 parts of antioxidant, 1.5 parts of accelerator, 0.15 parts of anti-scorch agent, and 2.5 parts of sulfur.
[0047] The method for preparing a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire in this embodiment comprises the following steps:
[0048] S1 Masterbatch Production
[0049] Add natural rubber, cis-1,4-butadiene rubber, conductive carbon black, antioxidant, zinc oxide and stearic acid to the internal mixer in sequence. Press the top bolt for 40 seconds, the top bolt pressure is 0.4-0.6Mpa, the bolt stays for 10 seconds, the top bolt is pressed for 40 seconds, the mixing temperature is 125℃, the speed is 40-45rpm, the bolt stays for 10 seconds, the top bolt is pressed, the mixing temperature rises to 155℃, and the rubber is discharged.
[0050] S2 Final Rubber Production
[0051] Add masterbatch, accelerators DM and CBS, anti-scorch agent CTP and sulfur to the internal mixer, set the speed to 30-45rpm, press the top bolt for 35s, the pressure of the top bolt is 0.4-0.6Mpa, after the bolt is raised for 10s, press the top bolt for 35s, the bolt is raised for 10s, press the top bolt, the mixing temperature rises to 105℃, the speed is increased to 50rpm, and the rubber is discharged.
[0052] Embodiment 4:
[0053] A high-conductivity and low-rolling-resistance tread base rubber formula for passenger car tires, comprising the following components in parts by weight: 75 parts of natural rubber, 25 parts of butadiene rubber, 45 parts of conductive carbon black (a product of Yongdong), 3 parts of zinc oxide, 1.5 parts of stearic acid, 5 parts of antioxidant, 1.5 parts of accelerator, 0.15 parts of anti-scorch agent, and 2.5 parts of sulfur.
[0054] The method for preparing a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire in this embodiment comprises the following steps:
[0055] S1 Masterbatch Production
[0056] Add natural rubber, cis-1,4-butadiene rubber, conductive carbon black, antioxidant, zinc oxide and stearic acid to the internal mixer in sequence. Press the top bolt for 40 seconds, the top bolt pressure is 0.4-0.6Mpa, the bolt stays for 10 seconds, the top bolt is pressed for 40 seconds, the mixing temperature is 125℃, the speed is 40-45rpm, the bolt stays for 10 seconds, the top bolt is pressed, the mixing temperature rises to 155℃, and the rubber is discharged.
[0057] S2 Final Rubber Production
[0058] Add masterbatch, accelerators DM and CBS, anti-scorch agent CTP and sulfur to the internal mixer, set the speed to 30-45rpm, press the top bolt for 35s, the pressure of the top bolt is 0.4-0.6Mpa, after the bolt is raised for 10s, press the top bolt for 35s, the bolt is raised for 10s, press the top bolt, the mixing temperature rises to 105℃, the speed is increased to 50rpm, and the rubber is discharged.
[0059] Comparative Example:
[0060] A high-conductivity and low-rolling-resistance tread base rubber formula for a passenger car tire comprises the following components in parts by weight: 75 parts of natural rubber, 25 parts of butadiene rubber, 2.0 parts of graphene, 40 parts of carbon black N660, 3 parts of zinc oxide, 1.5 parts of stearic acid, 5 parts of antioxidant, 1.5 parts of accelerator, 0.15 parts of anti-scorch agent and 2.5 parts of sulfur.
[0061] The method for preparing a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire in this embodiment comprises the following steps:
[0062] S1 Masterbatch Production
[0063] Add natural rubber, cis-1,4-butadiene rubber, conductive carbon black, antioxidant, zinc oxide and stearic acid to the internal mixer in sequence. Press the top bolt for 40 seconds, the top bolt pressure is 0.4-0.6Mpa, the bolt stays for 10 seconds, the top bolt is pressed for 40 seconds, the mixing temperature is 125℃, the speed is 40-45rpm, the bolt stays for 10 seconds, the top bolt is pressed, the mixing temperature rises to 155℃, and the rubber is discharged.
[0064] S2 Final Rubber Production
[0065] Add masterbatch, accelerators DM and CBS, anti-scorch agent CTP and sulfur to the internal mixer, set the speed to 30-45rpm, press the top bolt for 35s, the pressure of the top bolt is 0.4-0.6Mpa, after the bolt is raised for 10s, press the top bolt for 35s, the bolt is raised for 10s, press the top bolt, the mixing temperature rises to 105℃, the speed is increased to 50rpm, and the rubber is discharged.
[0066] The physical properties of Examples 1-4 of the present invention and the comparative example are shown in Table 1.
[0067] The performance of Examples 1-4 of the present invention and the comparative example on the experimental tire is shown in Table 2.
[0068]
[0069] Table 1
[0070] It can be seen from Table 1 that when 40 or 45 parts of conductive carbon black are used, both Tanδ@60℃ and resistivity can reach levels similar to those of graphene and carbon nanotubes.
[0071]
[0072] Table 2
[0073] From the test results in Table 2, it can be seen that conductive carbon black can meet the basic performance requirements of tires, while meeting the conductivity and not increasing the rolling resistance of tires. The use of conductive carbon black reduces costs, allows the base rubber and the chimney rubber to use a single formula, simplifies the extrusion process, reduces the requirements for the extruder, and reduces equipment investment.
[0074] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.
Claims
1. A formula of a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire, characterized in that: The formula includes the following components in parts by weight: 70-86 parts of natural rubber, 14-30 parts of butadiene rubber, 35-55 parts of conductive carbon black, 2-4 parts of zinc oxide, 1-2 parts of stearic acid, 3-5 parts of antioxidant, 1.8-2.2 parts of accelerator, 0.1-0.2 parts of anti-scorch agent and 1.6-2.8 parts of sulfur, wherein the total parts of natural rubber and butadiene rubber are 100 parts.
2. The formula of the high-conductivity and low-rolling-resistance tread base rubber for passenger car tires according to claim 1, characterized in that: The DBP oil absorption value of the conductive carbon black is in the range of 120±8 ml / 100 g, and the iodine absorption value is in the range of 55±5 mg / g.
3. The formula of the high-conductivity and low-rolling-resistance tread base rubber for passenger car tires according to claim 1, characterized in that: The natural rubber is trifoliate natural rubber, and the butadiene rubber is neodymium-based high-cis butadiene rubber.
4. The formula of the high-conductivity and low-rolling-resistance tread base rubber for passenger car tires according to claim 1, characterized in that: The antioxidant is two or three of the antioxidant TMQ, antioxidant 6PPD, antioxidant DTPD, and microcrystalline wax; The melting point of microcrystalline wax is above 75°C.
5. The formula of the high-conductivity and low-rolling-resistance tread base rubber for passenger car tires according to claim 1, characterized in that: The sulfur is heat-stable insoluble sulfur with an oil content of 20%. Under the condition of 105° C., the insoluble sulfur content is more than 75%.
6. The formula of the high-conductivity and low-rolling-resistance tread base rubber for passenger car tires according to claim 1, characterized in that: The accelerator is any one of accelerator DM and accelerator CBS, or a combination of both.
7. The formula of the high-conductivity and low-rolling-resistance tread base rubber for passenger car tires according to claim 1, characterized in that: The anti-scorching agent is anti-scorching agent CTP.
8. A method for preparing a high-conductivity and low-rolling-resistance tread base rubber for a passenger car tire, characterized in that: The following steps are involved: S1 Masterbatch Production: Add natural rubber, butadiene rubber, conductive carbon black, antioxidant, zinc oxide and stearic acid to the internal mixer in sequence, press the top bolt for 40 seconds, the top bolt pressure is 0.4Mpa-0.6Mpa, the bolt is raised for 10 seconds, the top bolt is pressed for 40 seconds, the mixing temperature is 125°C, the speed is 40rpm-45rpm, the bolt is raised for 10 seconds, the top bolt is pressed, the mixing temperature rises to 155°C, and the rubber is discharged; S2 final rubber production: Add masterbatch, accelerator DM and accelerator CBS, anti-scorch agent CTP and sulfur to the internal mixer, set the speed to 30rpm-45rpm, press the top bolt for 35s, the pressure of the top bolt is 0.4Mpa-0.6Mpa, after the bolt is raised for 10s, press the top bolt for 35s, raise the bolt for 10s, press the top bolt, the mixing temperature rises to 105℃, increase the speed to 50rpm, and discharge the rubber.