High-performance tire tread rubber based on synergistic system and preparation method

Abstract

The invention relates to the technical field of tread rubber, and discloses high-performance tire tread rubber based on a synergistic system and a preparation method thereof.The method comprises the following steps of first-stage mixing, second-stage mixing, third-stage mixing, final mixing and vulcanization molding. By adopting a composite vulcanization system composed of dicumyl peroxide and sulfur and cooperating with zinc methacrylate as a functional auxiliary agent, a dual synergistic cross-linked structure composed of a free radical cross-linked network and an ionic cross-linked network is formed in the vulcanization process, so that the uniformity and stability of the cross-linked network structure of the tread rubber can be effectively improved, and the service life of the tread rubber is prolonged. The reasonable regulation and control of the crosslinking density of the tread rubber in the vulcanization process are ensured, the problem that a traditional single vulcanization system cannot give consideration to the wear resistance and the dynamic heat generation performance is solved, the comprehensive mechanical property and the dynamic use performance of the tread rubber are further improved, and firm chemical combination between the reinforcing filler and rubber molecules is ensured.

Description

Technical Field

[0001] This invention relates to the field of tread compound technology, specifically to a high-performance tire tread compound based on a synergistic system and its preparation method. Background Technology

[0002] The tread compound is the outermost rubber layer of the tire that comes into direct contact with the road surface. It has a patterned design on its surface and is mainly composed of natural rubber and styrene-butadiene rubber. Carbon black is added to enhance its physical properties. Its core functions include transmitting traction and braking force, cushioning driving impacts, protecting the internal cord layers from damage, and increasing grip and anti-skid ability through the patterned structure.

[0003] Currently, due to the interaction of various materials and processes in the formulation and preparation of tire tread compounds, the single vulcanization system used in the preparation of high-performance tire tread compounds cannot control the generation rate and structure of cross-linked networks in real time during the vulcanization process. When the generated cross-linked network structure is singular and unevenly distributed, the wear resistance and dynamic heat generation performance of the tread compound cannot be simultaneously taken into account, and the balance of tread compound performance cannot be guaranteed.

[0004] Therefore, a high-performance tire tread compound based on a synergistic system and its preparation method are proposed to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-performance tire tread compound based on a synergistic system and its preparation method, which solves the problem mentioned in the background technology that the wear resistance and dynamic heat generation properties of the tread compound cannot be simultaneously achieved, and the balance of the tread compound's performance cannot be guaranteed.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-performance tire tread compound based on a synergistic system and its preparation method, comprising the following raw materials in parts by weight: 100 parts rubber matrix, 50-70 parts reinforcing filler, 1.5-2.8 parts vulcanizing agent, 1.5-2.0 parts vulcanization accelerator, 3-4 parts antioxidant, 5-10 parts processing oil, 4-6 parts activator, and 2-5 parts functional additives. The vulcanizing agent consists of dicumyl peroxide (DCP) and sulfur, and the functional additive is zinc methacrylate (ZDMA). The weight percentages of DCP are 0.5-1.2 parts, sulfur is 1.0-1.8 parts, and ZDMA is 2-5 parts. The rubber matrix is ​​a combination of at least two of the following: natural rubber (NR), solution styrene-butadiene rubber (SSBR), and cis-butadiene rubber (BR). The reinforcing filler is composed of carbon black and silica, with a weight ratio of carbon black to silica of (3-10):1. The tread rubber forms a synergistic double cross-linked network structure through free radical cross-linking initiated by DCP and ionic cross-linking formed by ZDMA.

[0007] Preferably, the rubber matrix is ​​composed of natural rubber, solution-polymerized styrene-butadiene rubber and butadiene rubber, wherein the natural rubber accounts for 50-70 parts by weight, the solution-polymerized styrene-butadiene rubber accounts for 20-40 parts by weight, and the butadiene rubber accounts for 10-30 parts by weight.

[0008] Preferably, the solution-polymerized styrene-butadiene rubber is a tin-coupled SSBR with a styrene content of 20-30% and a vinyl content of 45-65%. The cis-butadiene rubber is a neodymium-based cis-butadiene rubber Nd-BR, with a cis-1,4 structure content greater than 98%.

[0009] Preferably, the carbon black is selected from at least one of N234, N330, and N375; The silica is precipitated silica with a specific surface area of ​​150-200 m² / g; The reinforcing filler also includes a silane coupling agent, which is 1.5-2.5 parts by weight. The silane coupling agent is bis-3-triethoxysilylpropyltetrasulfide Si-69.

[0010] Preferably, the activator is composed of zinc oxide and stearic acid, wherein the weight parts of zinc oxide are 3-5 parts and the weight parts of stearic acid are 1-2 parts; The vulcanization accelerator is composed of accelerator CZN-cyclohexyl-2-benzothiazole sulfenamide and accelerator DM dibenzothiazole disulfide. The weight parts of accelerator CZ are 1.0-1.5 parts and the weight parts of accelerator DM are 0.5-1.0 parts.

[0011] Preferably, the antioxidant is a mixture of antioxidant RD 2,2,4-trimethyl-1,2-dihydroquinoline polymer and antioxidant 4020 or antioxidant 6PPDN-1,3-dimethylbutyl-N'-phenyl-p-phenylenediamine, wherein the antioxidant RD is present in 1-2 parts by weight and the antioxidant 4020 or 6PPD is present in 1-2 parts by weight. The operating oil is environmentally friendly aromatic oil TDAE, with a weight ratio of 8-10 parts.

[0012] Preferably, it includes the following steps: Step 1: First stage of mixing. Add the rubber matrix, antioxidant, and stearic acid to the internal mixer and mix for 1-2 minutes at a speed of 40-60 r / min. After heating to 80-90℃, discharge the rubber to the upper and lower sheets of the open mill to obtain the first stage of mixed rubber. Step 2: Two-stage mixing. Put the first-stage compound back into the internal mixer, add reinforcing filler, silane coupling agent and processing oil, mix at 50-70 r / min for 3-5 min, heat to 120-130℃, and discharge the compound to the upper and lower sheets of the open mill to obtain the two-stage compound. Step 3: Three-stage mixing. Put the two-stage compound back into the internal mixer, cool it to 100-110℃, add ZDMA and DCP, and mix at 30-50 r / min for 2-3 minutes. Control the discharge temperature at 105-115℃ to obtain the three-stage compound. Step 4: Final mixing. Wrap the three-stage compound rubber on the open mill, add sulfur and vulcanization accelerator, and pass through the mill 3-4 times at a roll temperature of 60-70℃. Then, roll the compound into triangular shapes 4-5 times and sheet it to obtain the tread rubber compound. Step 5: Vulcanization molding. Place the tread compound into a mold and vulcanize it in a hot press. The vulcanization temperature is 160-175℃, the vulcanization pressure is 10-15MPa, and the vulcanization time is 10-18min to obtain a high-performance tire tread compound.

[0013] Preferably, in step three, the rotor speed of the internal mixer is 40 r / min, the mixing time is 2.5 min, and the discharge temperature is strictly controlled below 110℃; In step four, the roll gap of the open mill is set to 0.5-1.0mm for thin pass and 3.0-4.0mm for triangular wrapping and sheeting.

[0014] Preferably, in step five, the vulcanization process adopts a two-stage heating procedure: the first stage vulcanizes at 160-165℃ for 5-8 minutes, and the second stage vulcanizes at 170-175℃ for 5-10 minutes, and the vulcanization mold is a tire tread pattern mold.

[0015] Preferably, in step two, the silane coupling agent and silica form a chemical bond through an in-situ reaction during the mixing process; In step five, during vulcanization, DCP decomposes to generate free radicals that initiate the cross-linking of rubber molecular chains and the polymerization of ZDMA. The nanoscale particles formed after ZDMA polymerization form ionic cross-linking points with the rubber matrix, together constituting a double cross-linked network structure.

[0016] Beneficial effects Compared with the prior art, the present invention provides a high-performance tire tread compound based on a synergistic system and its preparation method, which has the following beneficial effects: 1. In this invention, when designing the formulation of high-performance tire tread compound, a composite vulcanization system composed of dicumyl peroxide and sulfur is adopted, and zinc methacrylate is used as a functional additive. During the vulcanization process, a dual synergistic cross-linking structure composed of free radical cross-linking network and ionic cross-linking network is formed, which can effectively improve the uniformity and stability of the cross-linking network structure of the tread compound, ensure the reasonable control of the cross-linking density of the tread compound during the vulcanization process, solve the problem that the traditional single vulcanization system cannot take into account both wear resistance and dynamic heat generation performance, and further improve the comprehensive mechanical properties and dynamic performance of the tread compound.

[0017] 2. In this invention, when preparing high-performance tire tread compound, a specific ratio of natural rubber, solution-polymerized styrene-butadiene rubber, and cis-butadiene rubber is used as the rubber matrix. The use of carbon black and silica reinforcing filler system, combined with silane coupling agents, improves the dispersibility and bonding strength of the fillers in the rubber matrix. This effectively prevents filler agglomeration during mixing. Furthermore, when filler dispersion is uneven, in-situ reaction of the silane coupling agent achieves interface modification, ensuring a strong chemical bond between the reinforcing filler and rubber molecules, further enhancing the mechanical strength and wear resistance of the tread compound.

[0018] 3. In this invention, when optimizing the process of high-performance tire tread compound, a multi-stage mixing process is adopted and the processing temperature and feeding sequence of each stage are strictly controlled. In particular, zinc methacrylate and dicumyl peroxide are added separately in the third stage of mixing, which can effectively disperse and control the pre-crosslinking of functional additives. This allows the system to precisely regulate the vulcanization process and the formation of the crosslinking network, solving the problem of mutual constraints between dynamic and static mechanical properties when balancing multiple properties of the tread compound. This further achieves a synergistic improvement in the rolling resistance, wet skid resistance and wear resistance of the tread compound, ensuring the comprehensive performance and service life of the final product. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: A high-performance tire tread compound based on a synergistic system and its preparation method, comprising the following raw materials in parts by weight: 100 parts rubber matrix, 50 parts reinforcing filler, 1.5 parts vulcanizing agent, 1.5 parts vulcanization accelerator, 3 parts antioxidant, 5 parts processing oil, 4 parts activator, and 2 parts functional additives. The vulcanizing agent consists of dicumyl peroxide (DCP) and sulfur, and the functional additive is zinc methacrylate (ZDMA). The weight percentages of DCP are 0.5 parts, sulfur is 1.0 part, and ZDMA is 2 parts. The rubber matrix is ​​a combination of at least two of the following: natural rubber (NR), solution styrene-butadiene rubber (SSBR), and cis-butadiene rubber (BR). The reinforcing filler is composed of carbon black and silica, with a weight ratio of carbon black to silica of 3:1. The tread rubber forms a synergistic double cross-linked network structure through free radical cross-linking initiated by DCP and ionic cross-linking formed by ZDMA; The rubber matrix is ​​composed of natural rubber, solution-polymerized styrene-butadiene rubber and cis-butadiene rubber, wherein the weight percentage of natural rubber is 50 parts, the weight percentage of solution-polymerized styrene-butadiene rubber is 20 parts, and the weight percentage of cis-butadiene rubber is 10 parts. Solution-polymerized styrene-butadiene rubber (SSBR) is a tin-coupled type SSBR with a styrene content of 20% and a vinyl content of 45%. Neodymium-based butadiene rubber (Nd-BR) has a cis-1,4 structure content greater than 98%. The carbon black is selected from at least one of N234, N330, and N375; The silica is precipitated silica with a specific surface area of ​​150 m² / g; The reinforcing filler also includes a silane coupling agent, which is 1.5 parts by weight and is bis-3-triethoxysilylpropyltetrasulfide Si-69. The activator consists of zinc oxide and stearic acid, with zinc oxide comprising 3 parts by weight and stearic acid comprising 1 part by weight. The vulcanization accelerator is composed of accelerator CZN-cyclohexyl-2-benzothiazole sulfenamide and accelerator DM dibenzothiazole disulfide, with accelerator CZ having a weight of 1.0 part and accelerator DM having a weight of 0.5 part. The antioxidant is a mixture of antioxidant RD 2,2,4-trimethyl-1,2-dihydroquinoline polymer and antioxidant 4020 or antioxidant 6PPDN-1,3-dimethylbutyl-N'-phenyl-p-phenylenediamine, wherein antioxidant RD is 1 part by weight and antioxidant 4020 or 6PPD is 1 part by weight. The operating oil is environmentally friendly aromatic oil TDAE, with a weight of 8 parts; Includes the following steps: Step 1: First stage of mixing. Add the rubber matrix, antioxidant, and stearic acid to the internal mixer and mix for 1 minute at a speed of 40 r / min. After heating to 80℃, discharge the rubber to the upper and lower sheets of the open mill to obtain the first stage of mixed rubber. Step 2: Two-stage mixing. Put the first-stage compound back into the internal mixer, add reinforcing filler, silane coupling agent and processing oil, mix at 50 r / min for 3 min, heat to 120℃, and discharge the compound to the upper and lower sheets of the open mill to obtain the second-stage compound. Step 3: Three-stage mixing. Put the two-stage compound back into the internal mixer, cool it to 100℃, add ZDMA and DCP, mix at 30r / min for 2min, and control the discharge temperature at 105℃ to obtain the three-stage compound. Step 4: Final mixing. Wrap the three-stage compound rubber on the open mill, add sulfur and vulcanization accelerator, pass through the mill three times at a roller temperature of 60°C, make triangular wraps four times, and then sheet the rubber to obtain the tread rubber compound. Step 5: Vulcanization molding. The tread compound is placed into a mold and vulcanized in a hot press at a vulcanization temperature of 160℃, a vulcanization pressure of 10MPa, and a vulcanization time of 10min to obtain a high-performance tire tread compound. In step three, the rotor speed of the internal mixer is 40 r / min, the mixing time is 2.5 min, and the discharge temperature is strictly controlled below 110℃. In step four, the roll gap of the open mill is set to 0.5mm for thin pass and 3.0mm for triangular packing and sheeting. In step five, the vulcanization process adopts a two-stage heating procedure: the first stage vulcanizes at 160℃ for 5 minutes, and the second stage vulcanizes at 170℃ for 5 minutes. The vulcanization mold is a tire tread pattern mold. In step two, the silane coupling agent and silica form a chemical bond through an in-situ reaction during the mixing process; In step five, during vulcanization, DCP decomposes to generate free radicals that initiate the cross-linking of rubber molecular chains and the polymerization of ZDMA. The nanoscale particles formed after ZDMA polymerization form ionic cross-linking points with the rubber matrix, together constituting a double cross-linked network structure.

[0021] Example 2: A high-performance tire tread compound based on a synergistic system and its preparation method, comprising the following raw materials in parts by weight: 100 parts rubber matrix, 60 parts reinforcing filler, 1.9 parts vulcanizing agent, 1.8 parts vulcanization accelerator, 3.5 parts antioxidant, 8 parts processing oil, 5 parts activator, and 3 parts functional additives. The vulcanizing agent consists of dicumyl peroxide (DCP) and sulfur, and the functional additive is zinc methacrylate (ZDMA). The weight percentages of DCP are 0.7 parts, sulfur is 1.5 parts, and ZDMA is 3 parts. The rubber matrix is ​​a combination of at least two of the following: natural rubber (NR), solution styrene-butadiene rubber (SSBR), and cis-butadiene rubber (BR). The reinforcing filler is composed of carbon black and silica, with a weight ratio of carbon black to silica of 6:1. The tread rubber forms a synergistic double cross-linked network structure through free radical cross-linking initiated by DCP and ionic cross-linking formed by ZDMA; The rubber matrix is ​​composed of natural rubber, solution-polymerized styrene-butadiene rubber and cis-butadiene rubber, wherein the weight percentage of natural rubber is 60 parts, the weight percentage of solution-polymerized styrene-butadiene rubber is 30 parts, and the weight percentage of cis-butadiene rubber is 20 parts. Solution-polymerized styrene-butadiene rubber (SSBR) is a tin-coupled type SSBR with a styrene content of 25% and a vinyl content of 55%. Neodymium-based butadiene rubber (Nd-BR) has a cis-1,4 structure content greater than 98%. The carbon black is selected from at least one of N234, N330, and N375; The silica is a precipitated silica with a specific surface area of ​​170 m² / g; The reinforcing filler also includes a silane coupling agent, which is 2.0 parts by weight and is bis-3-triethoxysilylpropyltetrasulfide Si-69. The activator consists of zinc oxide and stearic acid, with zinc oxide comprising 4 parts by weight and stearic acid comprising 1.5 parts by weight. The vulcanization accelerator consists of accelerator CZN-cyclohexyl-2-benzothiazole sulfenamide and accelerator DM dibenzothiazole disulfide, with accelerator CZ having a weight ratio of 1.2 parts and accelerator DM having a weight ratio of 0.8 parts. The antioxidant is a mixture of antioxidant RD 2,2,4-trimethyl-1,2-dihydroquinoline polymer and antioxidant 4020 or antioxidant 6PPDN-1,3-dimethylbutyl-N'-phenyl-p-phenylenediamine, wherein antioxidant RD is 1.5 parts by weight and antioxidant 4020 or 6PPD is 1.5 parts by weight. The operating oil is environmentally friendly aromatic oil TDAE, which is 9 parts by weight; Includes the following steps: Step 1: First stage of mixing. Add the rubber matrix, antioxidant, and stearic acid to the internal mixer and mix for 1.5 minutes at a speed of 50 r / min. After heating to 85℃, discharge the rubber to the upper and lower sheets of the open mill to obtain the first stage of mixed rubber. Step 2: Two-stage mixing. Put the first-stage compound back into the internal mixer, add reinforcing filler, silane coupling agent and processing oil, mix at 60 r / min for 4 min, heat to 125℃, and discharge the compound to the upper and lower sheets of the open mill to obtain the two-stage compound. Step 3: Three-stage mixing. Put the two-stage compound back into the internal mixer, cool it to 105℃, add ZDMA and DCP, mix at 40r / min for 2.5min, and control the discharge temperature at 109℃ to obtain the three-stage compound. Step 4: Final mixing. Wrap the three-stage compound rubber on the open mill, add sulfur and vulcanization accelerator, and pass through the mill 3.5 times at a roll temperature of 65°C, then roll it into a triangular shape 4.5 times. Sheet it out to obtain the tread rubber compound. Step 5: Vulcanization molding. The tread compound is placed into a mold and vulcanized in a hot press at a temperature of 167°C, a pressure of 13MPa, and a time of 15 minutes to obtain a high-performance tire tread compound. In step three, the rotor speed of the internal mixer is 40 r / min, the mixing time is 2.5 min, and the discharge temperature is strictly controlled below 110℃. In step four, the roll gap of the open mill is set to 0.7mm for thin pass and 3.5mm for triangular packing and sheeting. In step five, the vulcanization process adopts a two-stage heating procedure: the first stage vulcanizes at 162℃ for 6 minutes, and the second stage vulcanizes at 172℃ for 7 minutes. The vulcanization mold is a tire tread pattern mold. In step two, the silane coupling agent and silica form a chemical bond through an in-situ reaction during the mixing process; In step five, during vulcanization, DCP decomposes to generate free radicals that initiate the cross-linking of rubber molecular chains and the polymerization of ZDMA. The nanoscale particles formed after ZDMA polymerization form ionic cross-linking points with the rubber matrix, together constituting a double cross-linked network structure.

[0022] Example 3: A high-performance tire tread compound based on a synergistic system and its preparation method, comprising the following raw materials in parts by weight: 100 parts rubber matrix, 70 parts reinforcing filler, 2.8 parts vulcanizing agent, 2.0 parts vulcanization accelerator, 4 parts antioxidant, 10 parts processing oil, 6 parts activator, and 5 parts functional additives. The vulcanizing agent consists of dicumyl peroxide (DCP) and sulfur, and the functional additive is zinc methacrylate (ZDMA). The weight percentages of DCP are 1.2 parts, sulfur is 1.8 parts, and ZDMA is 5 parts. The rubber matrix is ​​a combination of at least two of the following: natural rubber (NR), solution styrene-butadiene rubber (SSBR), and cis-butadiene rubber (BR). The reinforcing filler is composed of carbon black and silica, with a weight ratio of carbon black to silica of 10:1. The tread rubber forms a synergistic double cross-linked network structure through free radical cross-linking initiated by DCP and ionic cross-linking formed by ZDMA; The rubber matrix is ​​composed of natural rubber, solution-polymerized styrene-butadiene rubber and cis-butadiene rubber, wherein the weight percentage of natural rubber is 70 parts, the weight percentage of solution-polymerized styrene-butadiene rubber is 40 parts, and the weight percentage of cis-butadiene rubber is 30 parts. Solution-polymerized styrene-butadiene rubber (SSBR) is a tin-coupled type SSBR with a styrene content of 30% and a vinyl content of 65%. Neodymium-based butadiene rubber (Nd-BR) has a cis-1,4 structure content greater than 98%. The carbon black is selected from at least one of N234, N330, and N375; The silica is precipitated silica with a specific surface area of ​​200 m² / g; The reinforcing filler also includes a silane coupling agent, which is 2.5 parts by weight. The silane coupling agent is bis-3-triethoxysilylpropyltetrasulfide Si-69. The activator consists of zinc oxide and stearic acid, with zinc oxide comprising 5 parts by weight and stearic acid comprising 2 parts by weight. The vulcanization accelerator is composed of accelerator CZN-cyclohexyl-2-benzothiazole sulfenamide and accelerator DM dibenzothiazole disulfide, with 1.5 parts by weight of accelerator CZ and 1.0 part by weight of accelerator DM. The antioxidant is a mixture of antioxidant RD 2,2,4-trimethyl-1,2-dihydroquinoline polymer and antioxidant 4020 or antioxidant 6PPDN-1,3-dimethylbutyl-N'-phenyl-p-phenylenediamine, wherein antioxidant RD is 2 parts by weight and antioxidant 4020 or 6PPD is 2 parts by weight. The operating oil is environmentally friendly aromatic oil TDAE, with a weight of 10 parts; Includes the following steps: Step 1: First stage of mixing. Add the rubber matrix, antioxidant, and stearic acid to the internal mixer and mix for 2 minutes at 60 r / min. After heating to 90℃, discharge the rubber to the upper and lower sheets of the open mill to obtain the first stage of mixed rubber. Step 2: Two-stage mixing. Put the first-stage compound back into the internal mixer, add reinforcing filler, silane coupling agent and processing oil, mix at 70 r / min for 5 min, heat to 130℃, and discharge the compound to the upper and lower sheets of the open mill to obtain the second-stage compound. Step 3: Three-stage mixing. Put the two-stage compound back into the internal mixer, cool it to 110℃, add ZDMA and DCP, mix at 50r / min for 3min, and control the discharge temperature at 115℃ to obtain the three-stage compound. Step 4: Final mixing. The three-stage compound is rolled on a two-roll mill, sulfur and vulcanization accelerator are added, and the mixture is passed through the mill 4 times at a roll temperature of 70°C, then rolled into a triangular shape 5 times, and finally sheeted to obtain the tread compound. Step 5: Vulcanization molding. The tread compound is placed into a mold and vulcanized in a hot press at a temperature of 175°C, a pressure of 15MPa, and a time of 18 minutes to obtain a high-performance tire tread compound. In step three, the rotor speed of the internal mixer is 40 r / min, the mixing time is 2.5 min, and the discharge temperature is strictly controlled below 110℃. In step four, the roll gap of the open mill is set to 1.0mm for thin pass and 4.0mm for triangular packing and sheeting. In step five, the vulcanization process adopts a two-stage heating procedure: the first stage vulcanizes at 165℃ for 8 minutes, and the second stage vulcanizes at 175℃ for 10 minutes. The vulcanization mold is a tire tread pattern mold. In step two, the silane coupling agent and silica form a chemical bond through an in-situ reaction during the mixing process; In step five, during vulcanization, DCP decomposes to generate free radicals that initiate the cross-linking of rubber molecular chains and the polymerization of ZDMA. The nanoscale particles formed after ZDMA polymerization form ionic cross-linking points with the rubber matrix, together constituting a double cross-linked network structure.

[0023] Comparative Example 1 differs from Example 1 in that the functional additive zinc methacrylate (ZDMA) was not added during the preparation of the tread compound in this comparative example.

[0024] Comparative Example 2 differs from Example 2 in that the DCP / sulfur composite vulcanization system was not used in the preparation of the tread rubber in this comparative example; only the traditional sulfur vulcanization system was used.

[0025] Comparative Example 3 differs from Example 3 in that it does not use a rubber matrix that combines solution-polymerized styrene-butadiene rubber and cis-butadiene rubber, but only uses natural rubber as the rubber matrix.

[0026] Comparative Example 4 differs from Example 3 in that it does not employ a multi-stage mixing process in the mixing process, but rather a traditional single-stage mixing process.

[0027] The performance of the high-performance tire tread compounds prepared in Examples 1-3 and Comparative Examples 1-4 was tested. The test items and test methods are as follows: Tensile strength testing was performed using a universal testing machine to measure the maximum stress at which the dumbbell-shaped specimen was stretched to break. Tear strength testing was performed using a universal testing machine to measure the maximum force when a right-angled specimen was torn, and the tear strength was calculated. Abrasion resistance testing was performed using an Akron abrasion tester to measure the volume loss of the specimen under specific conditions. The rebound value test uses a rebound testing machine to measure the ratio of the rebound height to the initial height of the specimen after being impacted by a pendulum. Rolling resistance testing uses a dynamic mechanical analyzer to measure the loss factor tanδ of the sample at a specific frequency and temperature. The lower the tanδ value, the smaller the rolling resistance.

[0028] The test data of the high-performance tire tread compounds prepared in Examples 1-3 and Comparative Examples 1-4 are recorded in the table below:

[0029] By comparing and analyzing the data in the table, it can be seen that the high-performance tire tread rubber prepared using the processes in Examples 1-3 has significantly better performance than the tread rubber prepared using the processes in Comparative Examples 1-4. This indicates that when designing the formulation of high-performance tire tread rubber, using a composite vulcanization system composed of dicumyl peroxide and sulfur, and combining it with zinc methacrylate as a functional additive, a dual synergistic crosslinking structure composed of free radical crosslinking network and ionic crosslinking network is formed during the vulcanization process. This effectively improves the uniformity and stability of the crosslinking network structure of the tread rubber, ensures reasonable control of the crosslinking density of the tread rubber during the vulcanization process, and solves the problem that traditional single vulcanization systems cannot simultaneously achieve both wear resistance and dynamic heat generation performance. This further enhances the comprehensive mechanical properties and dynamic performance of the tread rubber. In the preparation of high-performance tire tread rubber, by using a specific ratio of natural rubber, solution-polymerized styrene-butadiene rubber, and cis-butadiene rubber as the rubber matrix, and optimizing the reinforcing filler system of carbon black and silica, the following steps are taken. The use of silane coupling agents can improve the dispersibility and bonding strength of fillers in the rubber matrix, effectively preventing filler agglomeration during mixing. Furthermore, when filler dispersion is uneven, in-situ reaction of the silane coupling agent can achieve interface modification, ensuring a strong chemical bond between the reinforcing filler and rubber molecules. This further improves the mechanical strength and wear resistance of the tread compound. In optimizing the process of high-performance tire tread compounds, a multi-stage mixing process is adopted, with strict control of the processing temperature and feeding sequence at each stage. In particular, the separate addition of zinc methacrylate and dicumyl peroxide in the third stage of mixing enables effective dispersion and pre-crosslinking control of functional additives. This allows the system to precisely regulate the vulcanization process and the formation of the crosslinking network, solving the problem of dynamic and static mechanical property constraints when balancing multiple tread compound properties. This further achieves a synergistic improvement in rolling resistance, wet skid resistance, and wear resistance, ensuring the overall performance and service life of the final product.

[0030] By comparing and analyzing the relevant data in the table, it can be seen that the high-performance tire tread compound prepared by the present invention not only has high tensile strength and tear strength, but also excellent wear resistance, high resilience and low rolling resistance. This indicates that the high-performance tire tread compound based on the synergistic system and the preparation method provided by the present invention have a broader market prospect and are more suitable for promotion.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-performance tire tread compound based on a synergistic system, characterized in that, Made from the following ingredients in parts by weight: 100 parts rubber matrix, 50-70 parts reinforcing filler, 1.5-2.8 parts vulcanizing agent, 1.5-2.0 parts vulcanization accelerator, 3-4 parts antioxidant, 5-10 parts processing oil, 4-6 parts activator, and 2-5 parts functional additives. The vulcanizing agent is composed of dicumyl peroxide (DCP) and sulfur, and the functional additive is zinc methacrylate (ZDMA). The DCP is 0.5-1.2 parts by weight, the sulfur is 1.0-1.8 parts by weight, and the ZDMA is 2-5 parts by weight. The rubber matrix is ​​a combination of at least two of natural rubber NR, solution styrene-butadiene rubber SSBR, and cis-butadiene rubber BR; The reinforcing filler is composed of carbon black and silica, and the weight ratio of carbon black to silica is (3-10):

1. The tread compound forms a synergistic double crosslinking network structure through free radical crosslinking initiated by DCP and ionic crosslinking formed by ZDMA.

2. The high-performance tire tread compound based on a synergistic system according to claim 1, characterized in that, The rubber matrix is ​​composed of natural rubber, solution-polymerized styrene-butadiene rubber and butadiene rubber, wherein the weight percentage of natural rubber is 50-70 parts, the weight percentage of solution-polymerized styrene-butadiene rubber is 20-40 parts, and the weight percentage of butadiene rubber is 10-30 parts.

3. The high-performance tire tread compound based on a synergistic system according to claim 1, characterized in that, The solution-polymerized styrene-butadiene rubber is a tin-coupled SSBR with a styrene content of 20-30% and a vinyl content of 45-65%. The butadiene rubber is neodymium-based butadiene rubber Nd-BR, with a cis-1,4 structure content greater than 98%.

4. The high-performance tire tread compound based on a synergistic system according to claim 1, characterized in that, The carbon black is selected from at least one of N234, N330, and N375; The silica is precipitated silica with a specific surface area of ​​150-200 m² / g; The reinforcing filler also includes a silane coupling agent, wherein the silane coupling agent is 1.5-2.5 parts by weight, and the silane coupling agent is bis-3-triethoxysilylpropyltetrasulfide Si-69.

5. A high-performance tire tread compound based on a synergistic system according to claim 1, characterized in that: The activator is composed of zinc oxide and stearic acid, wherein the zinc oxide is in the amount of 3-5 parts by weight and the stearic acid is in the amount of 1-2 parts by weight. The vulcanization accelerator is composed of accelerator CZN-cyclohexyl-2-benzothiazole sulfenamide and accelerator DM dibenzothiazole disulfide, wherein the weight fraction of accelerator CZ is 1.0-1.5 parts and the weight fraction of accelerator DM is 0.5-1.0 parts.

6. The high-performance tire tread compound based on a synergistic system according to claim 1, characterized in that, The antioxidant is a mixture of antioxidant RD2,2,4-trimethyl-1,2-dihydroquinoline polymer and antioxidant 4020 or antioxidant 6PPDN-1,3-dimethylbutyl-N'-phenyl-p-phenylenediamine, wherein the antioxidant RD is present in 1-2 parts by weight and the antioxidant 4020 or 6PPD is present in 1-2 parts by weight. The operating oil is environmentally friendly aromatic oil TDAE, with a weight of 8-10 parts.

7. A method for preparing a high-performance tire tread compound based on a synergistic system, achieving the high-performance tire tread compound based on a synergistic system as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: First stage of mixing. Add the rubber matrix, antioxidant, and stearic acid to the internal mixer and mix for 1-2 minutes at a speed of 40-60 r / min. After heating to 80-90℃, discharge the rubber to the upper and lower sheets of the open mill to obtain the first stage of mixed rubber. Step 2: Two-stage mixing. Put the first-stage compound back into the internal mixer, add reinforcing filler, silane coupling agent and processing oil, mix at 50-70 r / min for 3-5 min, heat to 120-130℃, and discharge the compound to the upper and lower sheets of the open mill to obtain the two-stage compound. Step 3: Three-stage mixing. Put the two-stage compound back into the internal mixer, cool it to 100-110℃, add ZDMA and DCP, and mix at 30-50 r / min for 2-3 minutes. Control the discharge temperature at 105-115℃ to obtain the three-stage compound. Step 4: Final mixing. Wrap the three-stage compound rubber on the open mill, add sulfur and vulcanization accelerator, and pass through the mill 3-4 times at a roll temperature of 60-70℃. Then, roll the compound into triangular shapes 4-5 times and sheet it to obtain the tread rubber compound. Step 5: Vulcanization molding. The tread compound is placed into a mold and vulcanized in a hot press at a temperature of 160-175℃, a pressure of 10-15MPa, and a time of 10-18min to obtain the high-performance tire tread compound.

8. The method for preparing a high-performance tire tread compound based on a synergistic system according to claim 7, characterized in that, In step three, the rotor speed of the internal mixer is 40 r / min, the mixing time is 2.5 min, and the discharge temperature is strictly controlled below 110℃. In step four, the roll gap of the open mill is set to 0.5-1.0 mm for thin pass and 3.0-4.0 mm for triangular packing and sheeting.

9. The method for preparing a high-performance tire tread compound based on a synergistic system according to claim 7, characterized in that, In step five, the vulcanization process adopts a two-stage heating procedure: the first stage vulcanizes at 160-165℃ for 5-8 minutes, and the second stage vulcanizes at 170-175℃ for 5-10 minutes. The vulcanization mold is a tire tread pattern mold.

10. The method for preparing a high-performance tire tread compound based on a synergistic system according to claim 7, characterized in that, In step two, the silane coupling agent and silica form a chemical bond through an in-situ reaction during the mixing process. In step five, during the vulcanization process, DCP decomposes to generate free radicals that initiate the cross-linking of rubber molecular chains and the polymerization of ZDMA. The nano-sized particles formed after ZDMA polymerization form ionic cross-linking points with the rubber matrix, together constituting a double cross-linked network structure.

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