A rubber compound and its preparation method, base rubber and tires

Abstract

This invention relates to the field of rubber materials, and particularly to a rubber compound and its preparation method, a base rubber, and tires. The rubber compound provided by this invention is formed by combining natural rubber, special butadiene rubber, carbon black, antioxidants, protective waxes, resin, zinc oxide, stearic acid, accelerators, vulcanizing agents, and specific multifunctional crosslinking agents in a certain proportion. This combination enables the construction of a highly stable carbon-carbon crosslinking network, utilizes the self-reinforcing effect of SPB resin in VCR617 to reduce carbon black content, and balances rolling resistance and mechanical properties, thereby achieving a balance between low rolling resistance and excellent mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of rubber materials, and in particular to a rubber compound and its preparation method, a base rubber, and tires. Background Technology

[0002] With the increasingly severe global energy crisis and the continuous upgrading of environmental protection regulations, "green tires" and energy conservation and emission reduction have become the core trends in the development of the modern tire industry. Rolling resistance, as one of the three key performance indicators of tires, directly determines a vehicle's fuel economy and carbon emission levels. Statistics show that the energy consumed by tire rolling resistance accounts for approximately 20%-30% of a vehicle's total energy consumption. Therefore, how to significantly reduce tire rolling resistance while ensuring the tire's basic mechanical properties (such as hardness and strength) is currently a key focus and challenge in tire industry research and development.

[0003] In tire structure, the base rubber (the transition layer between the tire belt layer and the tread, mainly serving the functions of adhesion, cushioning, and heat insulation) is the core load-bearing component of the tire. It is usually composed of natural rubber (NR), polybutadiene rubber (BR), and other main materials combined with a carbon black reinforcement system and a vulcanization system. In existing technologies, conventional methods to reduce the rolling resistance of the base rubber compound mainly focus on two directions: one is to optimize the dispersion of carbon black or select low-hysteresis carbon black; the other is to adjust the vulcanization system, increasing the proportion of monosulfide bonds (CSC) or disulfide bonds (CSSC) to reduce network loss of the vulcanized rubber under dynamic fatigue.

[0004] However, those skilled in the art have found that simply relying on carbon black variety optimization or adjustments to traditional vulcanization systems has significant limitations. Traditional polysulfide bonds (-SS-) have relatively low bond energies. Under dynamic conditions of high-speed tire driving and repeated compression deformation, the molecular chains are prone to relaxation and heat accumulation. This makes it difficult to reduce tanδ60℃ (an important indicator of rubber's dynamic mechanical properties, tested at 60℃; this value reflects the energy loss of rubber during dynamic deformation; a lower value indicates less internal frictional heat generation and lower rolling resistance) to a lower level, thus limiting further improvements in fuel economy. Simultaneously, to maintain the reinforcing effect of the base compound, traditional formulations often require a high filler content of carbon black. Friction between fillers and at the filler-rubber interface remain the main sources of hysteresis loss, resulting in limited reductions in rolling resistance.

[0005] For example, a typical publicly disclosed low rolling resistance base rubber technology is as follows: using natural rubber / ordinary butadiene rubber (BR9000) as the base material, with 50-55 parts carbon black filler, employing a traditional sulfur-accelerator vulcanization system, and adding a small amount of reinforcing resin or processing aids to some formulations. In general, the core components of this system are as follows: ① Rubber phase: natural rubber + ordinary high-cis BR; ② Filler system: high-volume carbon black (50-55 PHR); ③ Vulcanization system: sulfur + thiazole / sulfenamide accelerators, forming a CS / SS crosslinking network; ④ Functional additives: conventional antioxidants, plasticizers, and reinforcing resins. The technical logic of this solution is: relying on high carbon black to ensure modulus and strength, relying on the sulfur system to achieve crosslinking; and attempting to reduce heat generation by reducing sulfur content and optimizing the carbon black structure. However, this technical solution also has the following drawbacks: ① High carbon black filling → filler friction heat generation → increased rolling resistance: High carbon black filler is required to maintain strength; carbon black aggregates to form a filler network, and under dynamic conditions, carbon black-carbon black and carbon black-rubber friction generates a large amount of heat, further increasing tanδ60℃. ② Low crosslinking bond energy → high dynamic internal friction → persistently high heat generation and rolling resistance: The sulfur system generates CS / SS bonds, which have low bond energy and are easily broken and rearranged under dynamic deformation, resulting in high internal friction of molecular chain movement, directly leading to a high tanδ60℃ and high rolling resistance. ③ Difficulty in synergistic performance → contradiction between reduction and strength: Simple carbon black reduction leads to insufficient modulus and support; adding resin only provides physical reinforcement and does not change the type of crosslinking bonds, so it cannot reduce internal friction at the molecular level.

[0006] In summary, existing technologies have not effectively solved the problems of low heat generation and low rolling resistance, exhibiting inherent drawbacks such as high heat generation, high rolling resistance, and high dependence on fillers. Therefore, the industry urgently needs to develop a new rubber composition technology to achieve a balance between low heat generation, low rolling resistance, and excellent mechanical properties. Summary of the Invention

[0007] In view of this, the present invention provides a rubber compound and its preparation method, a base rubber, and a tire. The rubber compound provided by the present invention can effectively reduce tanδ60℃ while ensuring mechanical properties.

[0008] This invention provides a rubber compound, the raw materials for which are prepared include the following components in parts by weight:

[0009] Natural rubber: 50-80 parts;

[0010] Butadiene rubber: 20-50 parts;

[0011] Carbon black: 30-60 parts;

[0012] Anti-aging agent: 1.4~4.0 parts;

[0013] Protective wax: 1.0~2.0 parts;

[0014] Resin: 1.0~4.0 parts;

[0015] Zinc oxide: 1.5~3.0 parts;

[0016] Stearic acid: 1.5~3.0 parts;

[0017] Vulcanizing agent: 2.0~4.0 parts;

[0018] Accelerator: 1.0~3.0 parts;

[0019] Multifunctional crosslinking agent: 0.3~0.9 parts;

[0020] The butadiene rubber is VCR617;

[0021] The multifunctional crosslinking agent has the structure shown in formula (1):

[0022] Equation (1).

[0023] Preferably, the antioxidant includes antioxidant TMQ and antioxidant 6PPD;

[0024] The content of the antioxidant TMQ is 0.4 to 1.0 parts, and the content of the antioxidant 6PPD is 1.0 to 3.0 parts.

[0025] Preferably, the resin is an unsaturated hydrocarbon resin.

[0026] Preferably, the resin is A-90.

[0027] Preferably, the accelerator includes accelerator CBS and accelerator TBBS;

[0028] The content of the accelerator CBS is 0.5 to 1.5 parts, and the content of the accelerator TBBS is 0.5 to 1.5 parts.

[0029] Preferably, the natural rubber is SCRWF;

[0030] The carbon black is N550;

[0031] The protective wax is H2122H;

[0032] The stearic acid is plant-based stearic acid;

[0033] The vulcanizing agent is sulfur.

[0034] The present invention also provides a method for preparing the rubber compound described in the above technical solution, comprising: mixing, internally mixing and discharging natural rubber, butadiene rubber, carbon black, antioxidant, protective wax, resin, zinc oxide, stearic acid, accelerator, vulcanizing agent and multifunctional crosslinking agent to obtain the rubber compound.

[0035] Preferred, including:

[0036] S1. Natural rubber, butadiene rubber, carbon black, antioxidant, protective wax, resin, zinc oxide and stearic acid are mixed, kneaded and discharged to obtain the initial rubber mixture;

[0037] S2. The initial rubber mixture is mixed with an accelerator, a vulcanizing agent and a multifunctional crosslinking agent, and the mixture is discharged to obtain a rubber compound.

[0038] The present invention also provides a base adhesive, which is made from a rubber compound; the rubber compound is the rubber compound described in the above technical solution or is prepared by the preparation method described in the above technical solution.

[0039] The present invention also provides a tire, wherein the base rubber is the base rubber described in the above technical solution.

[0040] This invention provides a low-heat rubber compound, which is formed by blending natural rubber, a special butadiene rubber, carbon black, antioxidant, protective wax, resin, zinc oxide, stearic acid, accelerator, vulcanizing agent, and a specific multifunctional crosslinking agent in a certain proportion. Specifically, UBEPOL VCR617 rubber is compounded with Qixiang WY9188 multifunctional crosslinking agent. Through the technology of "high bond energy carbon-carbon bond crosslinking network construction + SPB resin self-reinforcing and carbon black reduction," the tanδ60℃ and heat generation of the rubber compound are reduced from the source without compromising the mechanical properties of the tire base compound, thus optimizing rolling resistance. This invention fundamentally changes the structural characteristics of the rubber crosslinking network, introducing high bond energy and high stability crosslinking bond types, and combining them with an efficient filler dispersion and reinforcement mechanism, thereby achieving a balance between low heat generation, low rolling resistance, and excellent mechanical properties.

[0041] The test results show that the rolling resistance tanδ60℃ of the rubber compound of the present invention is below 0.062, while the tensile strength is above 17MPa and the elongation at break is above 400%. While ensuring mechanical properties, it effectively reduces rolling resistance. Detailed Implementation

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0043] In this article, the technical features described in an open-ended manner include both closed technical solutions composed of the listed features and open technical solutions that include the listed features.

[0044] The term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0045] In this document, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when a range refers to an integer, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0046] In this article, when referring to units for data ranges, if the unit is only followed by the right endpoint, it indicates that the units for the left and right endpoints are the same. For example, 95~105℃ means that the units for the left endpoint "95" and the right endpoint "105" are both in degrees Celsius.

[0047] [First Aspect] The present invention provides a rubber compound, the raw materials for which are prepared include the following components in parts by weight:

[0048] Natural rubber: 50-80 parts;

[0049] Butadiene rubber: 20-50 parts;

[0050] Carbon black: 30-60 parts;

[0051] Anti-aging agent: 1.4~4.0 parts;

[0052] Protective wax: 1.0~2.0 parts;

[0053] Resin: 1.0~4.0 parts;

[0054] Zinc oxide: 1.5~3.0 parts;

[0055] Stearic acid: 1.5~3.0 parts;

[0056] Vulcanizing agent: 2.0~4.0 parts;

[0057] Accelerator: 1.0~3.0 parts;

[0058] Multifunctional crosslinking agent: 0.3~0.9 parts;

[0059] The butadiene rubber is VCR617;

[0060] The multifunctional crosslinking agent has the structure shown in formula (1):

[0061] Equation (1).

[0062] Existing technologies fail to address the issues of low heat generation and low rolling resistance from the perspectives of crosslinking bond nature and rubber self-reinforcing, exhibiting inherent drawbacks such as high heat generation, high rolling resistance, and high filler dependence. The rubber compound provided by this invention is a low tanδ 60℃ compound, meeting the energy-saving requirements of green tires. It employs a high-bond-energy carbon-carbon single-bond crosslinking network to replace the traditional sulfur bond network, improving network stability and reducing carbon black frictional heat generation and dynamic internal losses. Carbon black reduction is achieved through SPB self-reinforcing in VCR617, further reducing filler frictional heat generation and optimizing rolling resistance while maintaining mechanical properties. A synergistic match is achieved between high cis rubber, multifunctional crosslinking agent, and carbon black reduction, significantly reducing the heat generation and rolling resistance of the base rubber without compromising hardness, strength, or modulus.

[0063] About natural rubber:

[0064] In this invention, the source of the natural rubber is not particularly limited, and it can be a commercially available product; preferably, it is SCRWF, which can be sourced from Yunnan Natural Rubber Industry Group Xishuangbanna Jingyang Co., Ltd. In this invention, the content of the natural rubber is 50-80 parts by weight, specifically 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, or 80 parts.

[0065] About butadiene rubber:

[0066] In this invention, the butadiene rubber is VCR617, specifically Ube Industries, Ltd.'s VCR617 (or written as UBEPOL-VCR617). This butadiene rubber is composed of a high-cis-1,4-polybutadiene rubber matrix (cis content 98%) and a micro-dispersed isotactic 1,2-polybutadiene resin (SPB content 2%), with a Mooney viscosity ML(1+4) of 57-67 at 100°C. The SPB resin in VCR617 forms microdomains in the BR matrix, providing a filler-like reinforcing effect, but without filler-filler frictional heat generation. In this invention, the content of the butadiene rubber is 20-50 parts by weight, specifically 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, or 50 parts.

[0067] About carbon black:

[0068] In this invention, the carbon black is preferably N550, which can be sourced from Shanghai Cabot Chemical Co., Ltd., and has an external surface area of ​​34~44m². 2 / g. In this invention, the content of carbon black is 30-60 parts by weight, specifically 30 parts, 33 parts, 35 parts, 36 parts, 40 parts, 43 parts, 45 parts, 50 parts, 55 parts, and 60 parts.

[0069] Regarding anti-aging agents:

[0070] In this invention, the antioxidant includes antioxidant TMQ and antioxidant 6PPD. The antioxidant TMQ has the chemical name 2,2,4-trimethyl-1,2-dihydroquinoline polymer and can be sourced from Shandong Shangshun Chemical Co., Ltd. The antioxidant 6PPD has the chemical name N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine and can also be sourced from Shandong Shangshun Chemical Co., Ltd. In this invention, the total amount of the antioxidant is 1.4 to 4.0 parts by weight, specifically 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2.0 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3.0 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts, and 4.0 parts. The content of the antioxidant TMQ is 0.4 to 1.0 parts by weight, specifically 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, and 1.0 parts. The content of the antioxidant 6PPD is 1.0~3.0 parts by weight, specifically 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2.0 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, and 3.0 parts.

[0071] Regarding protective wax:

[0072] In this invention, the protective wax is preferably H2122H, which can be sourced from Shandong Yanggu Huatai Chemical Co., Ltd. In this invention, the content of the protective wax is 1.0~2.0 parts by weight, specifically 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, and 2.0 parts.

[0073] About resin:

[0074] In this invention, the resin is preferably an unsaturated hydrocarbon resin, more preferably A-90, which can be sourced from Qingdao Haijia Additives Co., Ltd. In this invention, the content of the resin is 1.0~4.0 parts, specifically 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2.0 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3.0 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts, and 4.0 parts.

[0075] Regarding zinc oxide and stearic acid:

[0076] In this invention, the source of the zinc oxide is not particularly limited; it can be a commercially available product, such as ZnO from Guangzhou Luchang Chemical Co., Ltd. The content of the zinc oxide in this invention is 1.5~3.0 parts by weight, specifically 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 1.99 parts, 2.0 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, and 3.0 parts.

[0077] In this invention, the stearic acid is preferably plant-based stearic acid, more preferably STEARIC ACID PALMATA1865, which may be derived from PT. PERMATA HIJAU PALM OLEO. In this invention, the content of the stearic acid is 1.5~3.0 parts by weight, specifically 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.89 parts, 1.9 parts, 2.0 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, and 3.0 parts.

[0078] Regarding vulcanizing agents:

[0079] In this invention, the vulcanizing agent is preferably sulfur, more preferably insoluble sulfur. The source of the insoluble sulfur is not particularly limited; it can be a commercially available product, such as HD-OT-20 (or HD OT 20), which can be sourced from Wuxi Huasheng Rubber New Material Technology Co., Ltd. In this invention, the content of the vulcanizing agent is 2.0~4.0 parts by weight, specifically 2.0 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3.0 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts, and 4.0 parts.

[0080] Regarding accelerators:

[0081] In this invention, the accelerator preferably includes accelerator CBS and accelerator TBBS. The chemical name of accelerator CBS is N-cyclohexyl-2-benzothiazole sulfenamide, which can be sourced from Shandong Shangshun Chemical Co., Ltd. The chemical name of accelerator TBBS is N-tert-butyl-2-benzothiazole sulfenamide, which can be sourced from Shandong Dairui New Materials Co., Ltd. In this invention, the total amount of the accelerator is 1.0~3.0 parts by weight, specifically 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2.0 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, and 3.0 parts. The content of the accelerator CBS is 0.5-1.5 parts by weight, specifically 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, or 1.5 parts. The content of the accelerator TBBS is 0.5-1.5 parts by weight, specifically 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, or 1.5 parts.

[0082] Regarding multifunctional crosslinking agents:

[0083] In this invention, the source of the multifunctional crosslinking agent of the component shown in formula (1) is not particularly limited, and it can be a commercially available product, such as WY9188 (full spelling SUPERVULER). ® WY9188 and KA9188 are preferred, with WY9188 (sourced from Jiangsu Qixiang High-Tech Materials Co., Ltd.) being more preferred. This crosslinking agent has unsaturated sulfur atoms at both ends of its carbon chain and a carbon atom in the middle, with a relatively high C-C bond energy. In the system of this invention, the crosslinking bonds formed during the crosslinking reaction stage are extremely stable, giving it advantages such as low heat generation, resistance to reversion, and small compression deformation. Furthermore, due to its long molecular chain, it also possesses the same good dynamic properties as polysulfide bonds. In this invention, the content of the multifunctional crosslinking agent is 0.3~0.9 parts by mass, specifically 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, and 0.9 parts.

[0084] [Second Aspect] This invention provides a method for preparing the rubber compound described in the above-mentioned technical solution, comprising: mixing, internally mixing, and discharging natural rubber, butadiene rubber, carbon black, antioxidant, protective wax, resin, zinc oxide, stearic acid, accelerator, vulcanizing agent, and multifunctional crosslinking agent to obtain the rubber compound. The types and amounts of each raw material are consistent with those described in the preceding technical solution and will not be repeated here.

[0085] In this invention, preferably, the preparation method specifically includes:

[0086] S1. Natural rubber, butadiene rubber, carbon black, antioxidant, protective wax, resin, zinc oxide and stearic acid are mixed, kneaded and discharged to obtain the initial rubber mixture;

[0087] S2. The initial rubber mixture is mixed with an accelerator, a vulcanizing agent and a multifunctional crosslinking agent, and the mixture is discharged to obtain a rubber compound.

[0088] In step S1: The mixing and internal mixing are carried out in an internal mixer. Specifically, natural rubber, butadiene rubber, carbon black, antioxidant, protective wax, resin, zinc oxide, and stearic acid are added to the internal mixer, mixed, and heated to 140°C for cleaning. Then, the temperature is raised to 160°C for discharge to obtain the initial rubber mixture. The total time from input to discharge is controlled between 120s and 180s.

[0089] In step S2: After step S1, preferably, the initial rubber mixture is first cooled to room temperature, then the accelerator, vulcanizing agent, and multifunctional crosslinking agent are added and mixed in a mixer. After mixing for a period of time, the mixture is cleaned, and then the rubber is automatically discharged when the mixer temperature reaches 95~105℃, yielding the rubber compound. The mixing time is preferably 40 seconds. The total time from input to discharge is controlled between 90 and 120 seconds. The discharge temperature is preferably 95~105℃, specifically 95℃, 96℃, 97℃, 98℃, 99℃, 100℃, 101℃, 102℃, 103℃, 104℃, and 105℃. After the above treatment, the rubber compound is obtained, which is a semi-finished material for manufacturing rubber products, commonly known as rubber compound. The rubber compound can be directly processed, molded, and vulcanized to produce the desired rubber products.

[0090] [Third Aspect] The present invention also provides a Base rubber, which is made from a rubber compound; the rubber compound is the rubber compound described in the above-mentioned technical solution or is prepared by the preparation method described in the above-mentioned technical solution. The Base rubber (also known as the base layer rubber) is a transition rubber layer between the tire belt layer and the tread.

[0091] [Fourth aspect] The present invention also provides a tire, wherein the Base adhesive is the Base adhesive described in the above technical solution.

[0092] Compared with the prior art, the present invention has the following advantages:

[0093] ① Significantly reduces dynamic heat generation of the rubber compound, optimizing core performance indicators

[0094] This invention utilizes the self-reinforcing effect of SPB resin in UBEPOL-VCR617 to reduce the amount of carbon black used, significantly reducing interfacial friction between carbon black particles and between carbon black and the rubber matrix. Combined with the high bond energy CC crosslinking network formed by WY9188 crosslinking agent, it greatly reduces the dynamic internal consumption of molecular chain segments and significantly reduces the tanδ60℃ value of the rubber compound, thus solving the industry pain point of excessive dynamic heat generation in traditional base rubber compounds from the source.

[0095] ② Effectively reduces tire rolling resistance, meeting the needs of green tire development.

[0096] Leveraging the high bond energy of C and C bonds and the low heat generation from molecular motion, combined with the reduced hysteresis loss due to carbon black reduction, the dual effect significantly reduces tire rolling resistance, effectively reducing vehicle energy consumption. It perfectly matches the R&D and production standards of green, low rolling resistance tires, improves tire energy-saving performance, and breaks through the technical bottleneck of traditional formulas that are difficult to further optimize rolling resistance.

[0097] ③ The formulation combines low rolling resistance with excellent mechanical properties, resulting in superior overall performance.

[0098] It achieves a triple synergistic effect of SPB self-reinforcing, CC crosslinking, and carbon black reduction, while significantly reducing heat generation and rolling resistance, and fully maintaining the original tensile strength, modulus, hardness and other key mechanical properties of the base compound. It solves the contradiction in existing technologies where reducing rolling resistance leads to a decrease in mechanical properties, while maintaining performance results in high heat generation, thus achieving a balance between low rolling resistance and high performance.

[0099] ④ It has strong industrial applicability and is easy to mass-produce.

[0100] This invention only optimizes and adjusts the raw material composition, without requiring the addition of special processing equipment. It can be directly adapted to the existing production lines of tire companies, with no additional process modification costs. It has strong industrial applicability and is conducive to large-scale promotion and application.

[0101] The test results show that the rolling resistance tanδ60℃ of the rubber compound of the present invention is below 0.062, while the tensile strength is above 17MPa and the elongation at break is above 400%. While ensuring mechanical properties, it effectively reduces rolling resistance.

[0102] To further understand the present invention, preferred embodiments are described below with reference to examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims. In the following examples and comparative examples, the sources of the raw materials are consistent with those described above. In the comparative examples, the butadiene rubber BR9000 is sourced from Zhejiang Chuanhua Synthetic Materials Co., Ltd.

[0103] Example 1

[0104] 1. Raw materials:

[0105] Natural rubber SCRWF: 60 parts;

[0106] Butadiene rubber VCR617: 40 parts;

[0107] Carbon black N550: 36 parts;

[0108] Antioxidant: 2.6 parts (0.6 parts of antioxidant TMQ, 2.0 parts of antioxidant 6PPD);

[0109] Protective wax H2122H: 1.5 parts;

[0110] Resin A-90: 3.0 parts;

[0111] Zinc oxide: 1.99 parts;

[0112] Stearic acid 1865: 1.89 parts;

[0113] Vulcanizing agent (insoluble sulfur HD-OT-20): 3.1 parts;

[0114] Accelerator: 1.4 parts (0.7 parts CBS accelerator, 0.7 parts TBBS accelerator);

[0115] Multifunctional crosslinking agent WY9188: 0.3 parts.

[0116] 2. Preparation of rubber compound

[0117] S1. Natural rubber, butadiene rubber, carbon black, antioxidant, protective wax, resin, zinc oxide and stearic acid are mixed in an internal mixer. The mixture is first heated to 140°C for cleaning, and then heated to 160°C for debinding to obtain the initial rubber mixture.

[0118] S2. The initial rubber mixture is cooled to room temperature, and then accelerator, vulcanizing agent and multifunctional crosslinking agent are added and mixed in an internal mixer. The mixture is first mixed for 40 seconds for cleaning, and then the rubber is automatically discharged when the temperature of the internal mixer rises to 100°C to obtain the rubber compound.

[0119] Example 2

[0120] 1. Raw materials:

[0121] Natural rubber SCRWF: 60 parts;

[0122] Butadiene rubber VCR617: 40 parts;

[0123] Carbon black N550: 36 parts;

[0124] Antioxidant: 2.6 parts (0.6 parts of antioxidant TMQ, 2.0 parts of antioxidant 6PPD);

[0125] Protective wax H2122H: 1.5 parts;

[0126] Resin A-90: 3.0 parts;

[0127] Zinc oxide: 1.99 parts;

[0128] Stearic acid 1865: 1.89 parts;

[0129] Vulcanizing agent (insoluble sulfur HD-OT-20): 3.1 parts;

[0130] Accelerator: 1.4 parts (0.7 parts CBS accelerator, 0.7 parts TBBS accelerator);

[0131] Multifunctional crosslinking agent WY9188: 0.6 parts.

[0132] 2. Preparation of adhesive: Same as in Example 1.

[0133] Example 3

[0134] 1. Raw materials:

[0135] Natural rubber SCRWF: 60 parts;

[0136] Butadiene rubber VCR617: 40 parts;

[0137] Carbon black N550: 36 parts;

[0138] Antioxidant: 2.6 parts (0.6 parts of antioxidant TMQ, 2.0 parts of antioxidant 6PPD);

[0139] Protective wax H2122H: 1.5 parts;

[0140] Resin A-90: 3.0 parts;

[0141] Zinc oxide: 1.99 parts;

[0142] Stearic acid 1865: 1.89 parts;

[0143] Vulcanizing agent (insoluble sulfur HD-OT-20): 3.1 parts;

[0144] Accelerator: 1.4 parts (0.7 parts CBS accelerator, 0.7 parts TBBS accelerator);

[0145] Multifunctional crosslinking agent WY9188: 0.9 parts.

[0146] 2. Preparation of adhesive: Same as in Example 1.

[0147] Example 4

[0148] 1. Raw materials:

[0149] Natural rubber SCRWF: 50 parts;

[0150] Butadiene rubber VCR617: 50 parts;

[0151] Carbon black N550: 33 parts;

[0152] Antioxidant: 2.6 parts (0.6 parts of antioxidant TMQ, 2.0 parts of antioxidant 6PPD);

[0153] Protective wax H2122H: 1.5 parts;

[0154] Resin A-90: 3.0 parts;

[0155] Zinc oxide: 1.99 parts;

[0156] Stearic acid 1865: 1.89 parts;

[0157] Vulcanizing agent (insoluble sulfur HD-OT-20): 3.1 parts;

[0158] Accelerator: 1.4 parts (0.7 parts CBS accelerator, 0.7 parts TBBS accelerator);

[0159] Multifunctional crosslinking agent WY9188: 0.6 parts.

[0160] 2. Preparation of adhesive: Same as in Example 1.

[0161] Example 5

[0162] 1. Raw materials:

[0163] Natural rubber SCRWF: 80 parts;

[0164] Butadiene rubber VCR617: 20 parts;

[0165] Carbon black N550: 43 parts;

[0166] Antioxidant: 2.6 parts (0.6 parts of antioxidant TMQ, 2.0 parts of antioxidant 6PPD);

[0167] Protective wax H2122H: 1.5 parts;

[0168] Resin A-90: 3.0 parts;

[0169] Zinc oxide: 1.99 parts;

[0170] Stearic acid 1865: 1.89 parts;

[0171] Vulcanizing agent (insoluble sulfur HD-OT-20): 3.1 parts;

[0172] Accelerator: 1.4 parts (0.7 parts CBS accelerator, 0.7 parts TBBS accelerator);

[0173] Multifunctional crosslinking agent WY9188: 0.6 parts.

[0174] 2. Preparation of adhesive: Same as in Example 1.

[0175] Comparative Example 1

[0176] The implementation follows Example 1, except that the raw material formulation is modified by replacing the rubber raw material "60 parts natural rubber SCRWF + 40 parts butadiene rubber VCR617" with "80 parts natural rubber SCRWF + 20 parts butadiene rubber BR9000", increasing the amount of carbon black to 50 parts, and not adding the multifunctional crosslinking agent WY9188.

[0177] Comparative Example 2

[0178] The implementation follows Example 1, except that the raw material formulation is modified by replacing the rubber raw material "60 parts natural rubber SCRWF + 40 parts butadiene rubber VCR617" with "80 parts natural rubber SCRWF + 20 parts butadiene rubber VCR617", increasing the amount of carbon black to 50 parts, and not adding the multifunctional crosslinking agent WY9188.

[0179] Comparative Example 3

[0180] The implementation follows Example 1, except that the raw material formulation is modified so that the rubber raw material “60 parts natural rubber SCRWF + 40 parts butadiene rubber VCR617” is replaced with “80 parts natural rubber SCRWF + 20 parts butadiene rubber VCR617”, the amount of carbon black is increased to 43 parts, and the multifunctional crosslinking agent WY9188 is not added.

[0181] Comparative Example 4

[0182] The implementation followed Example 1, except that the multifunctional crosslinking agent WY9188 was not added.

[0183]

Performance testing

[0184] Performance tests were conducted on each embodiment and comparative product, and the results are shown in Table 1.

[0185] (1) Tanδ60℃: The dynamic viscoelastic performance tester of UESHIMA VR7130 was used. The viscoelastic test conditions were: 0.2% strain, frequency 10Hz, temperature 30-80 degrees Celsius temperature scan. Tanδ60℃ reflects the energy loss of rubber during dynamic deformation. The lower the value, the less internal frictional heat is generated and the lower the rolling resistance.

[0186] (2) Tensile strength and elongation at break: T2000 tester was used. Test conditions: 3# dumbbell specimen, thickness 2±0.2mm, tensile speed 500±50mm / min.

[0187] Table 1: Test Results of Each Example and Comparative Product

[0188]

[0189] As can be seen from the test results in the table above, the rolling resistance tanδ60℃ of the products obtained in Examples 1-5 of this invention is below 0.062, while the tensile strength is above 17MPa and the elongation at break is above 400%. While ensuring mechanical properties, the rolling resistance is effectively reduced.

[0190] Comparative Example 1 uses a formula of natural rubber, ordinary butadiene rubber, and high carbon black content. The tensile strength, elongation at break, and hardness meet the design requirements, but the rolling resistance Tanδ at 60℃ is relatively high.

[0191] Compared with Comparative Example 1, Comparative Example 2 uses UBEPOL-VCR617 to replace ordinary butadiene rubber, which slightly improves the mechanical properties, but the rolling resistance Tanδ 60℃ further increases.

[0192] Compared with Comparative Example 2, Comparative Example 3 reduced the amount of carbon black used, and the rolling resistance Tanδ 60°C was lower, but it was still higher than that of the Example.

[0193] Compared with Example 1, Comparative Example 4 did not add the multifunctional crosslinking agent WY9188, and the resulting product had an increased rolling resistance Tanδ60℃.

[0194] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely to aid in understanding the method and core ideas of the present invention, including the best mode, and to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to those expressed in the claims, or if they include equivalent structural elements that are not substantially different from those expressed in the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A rubber compound, characterized in that, Its preparation raw materials include the following components in parts by weight: Natural rubber: 50-80 parts; Butadiene rubber: 20-50 parts; Carbon black: 30-60 parts; Anti-aging agent: 1.4~4.0 parts; Protective wax: 1.0~2.0 parts; Resin: 1.0~4.0 parts; Zinc oxide: 1.5~3.0 parts; Stearic acid: 1.5~3.0 parts; Vulcanizing agent: 2.0~4.0 parts; Accelerator: 1.0~3.0 parts; Multifunctional crosslinking agent: 0.3~0.9 parts; The butadiene rubber is VCR617; The multifunctional crosslinking agent has the structure shown in formula (1): Equation (1).

2. The rubber compound according to claim 1, characterized in that, The antioxidants include antioxidant TMQ and antioxidant 6PPD; The content of the antioxidant TMQ is 0.4 to 1.0 parts, and the content of the antioxidant 6PPD is 1.0 to 3.0 parts.

3. The rubber compound according to claim 1, characterized in that, The resin is an unsaturated hydrocarbon resin.

4. The rubber compound according to claim 1 or 3, characterized in that, The resin is A-90.

5. The rubber compound according to claim 1, characterized in that, The accelerators include accelerator CBS and accelerator TBBS; The content of the accelerator CBS is 0.5 to 1.5 parts, and the content of the accelerator TBBS is 0.5 to 1.5 parts.

6. The rubber compound according to claim 1, characterized in that, The natural rubber is SCRWF; The carbon black is N550; The protective wax is H2122H; The stearic acid is plant-based stearic acid; The vulcanizing agent is sulfur.

7. A method for preparing a rubber compound according to any one of claims 1 to 6, characterized in that, include: Natural rubber, butadiene rubber, carbon black, antioxidant, protective wax, resin, zinc oxide, stearic acid, accelerator, vulcanizing agent and multifunctional crosslinking agent are mixed, kneaded and discharged to obtain rubber compound.

8. The preparation method according to claim 7, characterized in that, include: S1. Natural rubber, butadiene rubber, carbon black, antioxidant, protective wax, resin, zinc oxide and stearic acid are mixed, kneaded and discharged to obtain the initial rubber mixture; S2. The initial rubber mixture is mixed with an accelerator, a vulcanizing agent and a multifunctional crosslinking agent, and the mixture is discharged to obtain a rubber compound.

9. A base adhesive, characterized in that, It is made from rubber compound; the rubber compound is any one of claims 1 to 6 or is prepared by any one of claims 7 to 8.

10. A tire, characterized in that, The Base adhesive is the Base adhesive described in claim 9.

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