Non-slip all-steel heavy-duty truck tire tread rubber composition

Abstract

Provided is a non-slip all-steel heavy-duty truck tire tread rubber composition, which is composed of the following raw materials in parts by weight: 60-70 parts of natural rubber, 5-15 parts of neodymium cis-polybutadiene rubber, 15-35 parts of dual glass transition temperature, solution-polymerized styrene-butadiene rubber, 45-60 parts of carbon black, 10-20 parts of high-specific surface area white carbon black, 1.2-2.5 parts of a silane coupling agent, 8-10 parts of a modified anti-skid resin, 2-5 parts of zinc oxide, 1-3 parts of stearic acid, 1-3 parts of anti-aging agent 4020, 1-3 parts of anti-aging agent RD, 1-3 parts of protective wax, 1-1.8 parts of sulfur, and 1-1.5 parts of accelerator NS. The tread rubber composition has two glass transition temperatures, the first glass transition temperature being ≤-60℃, which meets the usage requirements in extremely cold regions, and -40℃≤the second glass transition temperature≤-20℃, which provides excellent anti-skid performance and grip performance on icy and snowy roads; in addition, heat generation is reduced and wear resistance is increased by more than 30% compared with existing products, meeting the usage requirements of tires in extremely cold regions.

Description

Anti-skid all-steel truck tire tread rubber composition Technical Field

[0001] The invention relates to the technical field of tire tread rubber compositions, in particular to an anti-skid all-steel truck tire tread rubber composition. Background Art

[0002] With the rapid development of my country's transportation and logistics industries, all-steel trucks are often required to transport goods across large geographical areas, such as from Guangdong Province to Heilongjiang Province. In these situations, tires must withstand a variety of road conditions, from high temperatures and heavy rain to low temperatures and snow. Therefore, tire treads must exhibit excellent wear resistance, wet skid resistance, and grip on ice and snow to provide good handling performance and ensure vehicle safety.

[0003] In the prior art, when designing anti-skid all-steel truck tire tread rubber compositions, to ensure both wear resistance and low-temperature performance, a certain percentage of cis-1,4-butadiene rubber (CIBR) is typically added to natural rubber. CIBR is the most cold-resistant synthetic rubber, with a glass transition temperature (Tg) reaching -100°C. This reduces the brittleness of the tread rubber at low temperatures and provides excellent wear resistance. However, CIBR has poor wet skid resistance, making it prone to slipping in rainy and snowy conditions. Patent CN105037824B combines solution-polymerized styrene-butadiene rubber (SBR), which has a Tg close to that of natural rubber, with oil-extended neodymium-based CIBR (NdBR) with a lower Tg, along with the addition of highly dispersed silica. This results in a tread with moderate hardness at low temperatures and excellent snow and wet skid resistance. Patent CN111333934B combines functionalized SBR with a Tg below -60°C, liquid rubber, highly dispersed silica, and a tear-resistant resin to improve the tread's grip on snow and wet conditions while reducing heat generation.

[0004] Compared with the traditional system of combining natural rubber and butadiene rubber, the above technical solution overcomes the disadvantage of poor anti-skid performance of butadiene rubber by combining low-Tg solution-polymerized styrene-butadiene rubber and highly dispersed silica. The tread rubber has good low-temperature performance (low E' value at -25°C) and excellent anti-wet skid performance (high tanδ value at 0°C). However, its technical means also lead to high heat generation (high tanδ value at 60°C), and the particle size of highly dispersed silica is small and the reinforcement is insufficient, so the wear resistance of the tire needs to be improved. Summary of the Invention

[0005] The invention provides an anti-skid all-steel truck tire tread rubber composition, which is used to solve the defects of an anti-skid all-steel truck tire tread rubber composition in the prior art.

[0006] The invention provides an anti-skid all-steel truck tire tread rubber composition. The composition comprises the following raw materials, in parts by weight: 60-70 parts of natural rubber, 5-15 parts of neodymium-based butadiene rubber, 15-35 parts of double glass transition temperature solution-polymerized styrene-butadiene rubber, 45-60 parts of carbon black, 10-20 parts of high specific surface area white carbon black, 1.2-2.5 parts of a silane coupling agent, 8-10 parts of a modified anti-skid resin, 2-5 parts of zinc oxide, 1-3 parts of stearic acid, 1-3 parts of an antioxidant 4020, 1-3 parts of an antioxidant RD, 1-3 parts of a protective wax, 1-1.8 parts of sulfur, and 1-1.5 parts of an accelerator NS.

[0007] According to the present invention, a non-slip all-steel truck tire tread rubber composition is provided. The dual glass transition temperature solution-polymerized styrene-butadiene rubber has a dual glass transition temperature, wherein the first Tg is less than -70°C and the second Tg temperature ranges from -55°C to -35°C, and the peak value of the loss factor is lower than that of an ordinary low glass transition temperature solution-polymerized styrene-butadiene rubber having a single glass transition temperature.

[0008] According to the anti-skid all-steel truck tire tread rubber composition provided by the present invention, the carbon black is N115 or N220.

[0009] According to the anti-skid all-steel truck tire tread rubber composition provided by the present invention, the high specific area white carbon black has a specific surface area of ​​220-300m2 as measured by BET. 2 / g, dibutyl phthalate absorption value is 250-300cm 3 / 100g.

[0010] According to the anti-skid all-steel truck tire tread rubber composition provided by the present invention, the silane coupling agent is Si-75, and the weight ratio of the silane coupling agent to high specific surface area white carbon black is 1:10-1.4:10.

[0011] According to the anti-skid all-steel truck tire tread rubber composition provided by the present invention, the modified moisture-resistant resin is a modified styrene and dicyclopentadiene copolymer resin.

[0012] According to the present invention, a non-skid all-steel truck tire tread rubber composition is provided, and a method for preparing the non-skid all-steel truck tire tread rubber composition is carried out according to the following steps:

[0013] (a) Natural rubber, neodymium-based butadiene rubber, double glass transition temperature solution-polymerized styrene-butadiene rubber, part of the carbon black, high specific surface area white carbon black, and silane coupling agent were placed in an internal mixer and mixed for 40-50 seconds at a mixer speed of 40-55 rpm and a top bolt pressure of 45-55 N / cm 2, lift the top bolt twice, hold for 5-10 seconds each time, and when the mixing temperature reaches 150-155℃, discharge the rubber and get a masterbatch;

[0014] (b) Place a masterbatch, the remaining carbon black, zinc oxide, stearic acid, modified anti-slip resin, antioxidant 4020, antioxidant RD, and protective wax into an internal mixer and mix for 10-30 seconds at a mixer speed of 45-50 rpm and a top bolt pressure of 45-55 N / cm 2 When the mixing temperature is 155-165℃, the rubber is discharged and the sheet is obtained to obtain the second-stage masterbatch;

[0015] (c) Add the second stage masterbatch, sulfur and accelerator NS into the internal mixer and mix for 20-30 seconds. The internal mixer speed is 20-25 rpm and the upper bolt pressure is 40-45 N / cm 2 When the mixing temperature is 100-110℃, the rubber is discharged into sheets to obtain the tread rubber.

[0016] The present invention provides an anti-skid all-steel truck tire tread rubber composition, which has the following technical effects: the anti-skid all-steel truck tire tread rubber composition has two glass transition temperatures, the first glass transition temperature (Tg1) ranges from Tg1≤-60°C, has excellent low-temperature resistance, and meets the conditions for use in severely cold areas; the second glass transition temperature (Tg2) ranges from -40°C≤Tg2≤-20°C, has a low E' at -25°C, and a high tanδ at 0°C, and has excellent grip performance on wet land and icy and snowy roads; the tanδ at 60°C is low, the heat generation of the rubber material is low, and the wear resistance is improved by more than 30% compared with the existing technology, meeting the high-performance use requirements of tires for safety in severely cold and rainy and snowy climates and for fuel saving and high wear resistance in normal weather.

[0017] 1. Using solution-polymerized styrene-butadiene rubber (SBR) with dual glass transition temperatures (Tg), the first Tg is less than or equal to -70°C, and the second Tg temperature range is -55°C to -35°C. In addition, the peak value of the loss factor during temperature scanning is lower than that of ordinary low-Tg SBR with a single glass transition temperature. This allows the tread rubber of all-steel truck tires to have two glass transition temperatures. On the one hand, this allows the rubber compound to have moderate hardness at low temperatures and good low-temperature resistance. On the other hand, it allows the rubber compound to have a low elastic modulus at -25°C, a high loss factor tanδ value at 0°C, and a low loss factor tanδ value at 60°C, thus taking into account high ice and snow grip, wet skid resistance, and low heat buildup.

[0018] 2. Use high specific surface area white carbon black, BET specific surface area is 220-300m 2 / g, dibutyl phthalate absorption value 250-300cm 3 / 100g, through the adjustment of components and optimization of the ratio with silane coupling agent Si75, the ability to penetrate water film is improved to ensure grip on wet ground, ice and snow, while the wear resistance is significantly improved compared to the tread rubber compound using high-dispersion silica with low specific surface area.

[0019] 3. Use modified styrene and dicyclopentadiene copolymer anti-skid resin, the resin has good compatibility with rubber, which can simultaneously improve the anti-skid performance of the tread rubber and reduce rolling resistance.

[0020] The present invention uses low-peak dual-glass transition temperature solution-polymerized styrene-butadiene rubber, high-area silica, modified styrene and dicyclopentadiene copolymer resin, and optimizes the ratio of each component of the formulation system to prepare an all-steel tread rubber composition. The composition has excellent low-temperature resistance, meets the conditions for use in severe cold regions, has superior grip performance on wetlands and icy and snowy roads, and has wear resistance improved by more than 30% compared to existing technologies. This meets the high-performance use requirements of tires for safety in severe cold, rainy and snowy climates, and for fuel efficiency and high wear resistance in ordinary weather. This solves the problem that the current technical means of using low-Tg solution-polymerized styrene-butadiene rubber and highly dispersed silica to overcome the poor anti-skid performance of butadiene rubber are relatively small in particle size and insufficient reinforcement of the highly dispersed silica, resulting in a need to improve the wear resistance of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] FIG1 is a DMA temperature scanning curve of the tread rubber prepared in Comparative Example 1 and Example 5 of the present invention. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention are described in further detail below in conjunction with the examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0024] In order to better understand the purpose of the present invention, the present invention is described in further detail below.

[0025] A non-skid all-steel truck tire tread rubber composition according to an embodiment of the present application is composed of the following raw materials, in parts by weight: 60-70 parts of natural rubber, 5-15 parts of neodymium-based butadiene rubber, 15-35 parts of double glass transition temperature solution-polymerized styrene-butadiene rubber, 45-60 parts of carbon black, 10-20 parts of high specific surface area white carbon black, 1.2-2.5 parts of silane coupling agent, 8-10 parts of modified anti-skid resin, 2-5 parts of zinc oxide, 1-3 parts of stearic acid, 1-3 parts of antioxidant 4020, 1-3 parts of antioxidant RD, 1-3 parts of protective wax, 1-1.8 parts of sulfur, and 1-1.5 parts of accelerator NS.

[0026] To further optimize the above technical solution, the double glass transition temperature solution-polymerized styrene-butadiene rubber has a double glass transition temperature, the first Tg of which is less than -70°C, and the second Tg temperature range is -55°C to -35°C, and the peak value of its loss factor is lower than that of the ordinary low glass transition temperature solution-polymerized styrene-butadiene rubber with a single glass transition temperature.

[0027] In order to further optimize the above technical solution, the carbon black is N115 or N220.

[0028] In order to further optimize the above technical solution, the high specific area white carbon black was measured by BET to have a specific surface area of ​​220-300m 2 / g, dibutyl phthalate absorption value is 250-300cm 3 / 100g.

[0029] In order to further optimize the above technical solution, the silane coupling agent is Si-75, and the weight ratio of the silane coupling agent to the high specific surface area white carbon black is 1:10-1.4:10.

[0030] In order to further optimize the above technical solution, the modified moisture-resistant resin is a modified styrene and dicyclopentadiene copolymer resin.

[0031] To further optimize the above technical solution, a method for preparing a non-slip all-steel truck tire tread rubber composition is carried out according to the following steps:

[0032] (a) Natural rubber, neodymium-based butadiene rubber, double glass transition temperature solution-polymerized styrene-butadiene rubber, part of the carbon black, high specific surface area white carbon black, and silane coupling agent were placed in an internal mixer and mixed for 40-50 seconds at a mixer speed of 40-55 rpm and a top bolt pressure of 45-55 N / cm 2 , lift the top bolt twice, hold for 5-10 seconds each time, and when the mixing temperature reaches 150-155℃, discharge the rubber and get a masterbatch;

[0033] (b) Place a masterbatch, the remaining carbon black, zinc oxide, stearic acid, modified anti-slip resin, antioxidant 4020, antioxidant RD, and protective wax into an internal mixer and mix for 10-30 seconds at a mixer speed of 45-50 rpm and a top bolt pressure of 45-55 N / cm 2 When the mixing temperature is 155-165℃, the rubber is discharged and the sheet is obtained to obtain the second-stage masterbatch;

[0034] (c) Add the second stage masterbatch, sulfur and accelerator NS into the internal mixer and mix for 20-30 seconds. The internal mixer speed is 20-25 rpm and the upper bolt pressure is 40-45 N / cm 2 When the mixing temperature is 100-110℃, the rubber is discharged into sheets to obtain the tread rubber. Example 1

[0035] 70 parts of natural rubber, 15 parts of neodymium-based butadiene rubber, 15 parts of double glass transition temperature solution-polymerized styrene-butadiene rubber, 24 parts of carbon black, 15 parts of highly dispersed white carbon black, and 1.2 parts of silane coupling agent were put into an internal mixer and mixed for 45 seconds at a mixer speed of 50 rpm and a top bolt pressure of 50 N / cm. 2 , lift the top bolt twice, hold for 10 seconds each time, and when the mixing temperature reaches 150℃, discharge the rubber and get a masterbatch;

[0036] Put a masterbatch, 24 parts of carbon black, 3 parts of zinc oxide, 2 parts of stearic acid, 8 parts of anti-slip resin, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, and 1.5 parts of protective wax into an internal mixer and mix for 20 seconds. The internal mixer speed is 45 rpm and the upper bolt pressure is 50 N / cm 2 When the mixing temperature is 155-165℃, the rubber is discharged and the sheet is obtained to obtain the second-stage masterbatch;

[0037] Put the second stage masterbatch, 1.6 parts of sulfur and 1.3 parts of accelerator NS into the internal mixer and mix for 25 seconds. The internal mixer speed is 22 rpm and the upper bolt pressure is 42 N / cm 2 When the mixing temperature is 105℃, the rubber is discharged into sheets to obtain the tread rubber. Example 2

[0038] 65 parts of natural rubber, 15 parts of neodymium-based butadiene rubber, 20 parts of double glass transition temperature solution-polymerized styrene-butadiene rubber, 24 parts of carbon black, 15 parts of high specific surface area white carbon black and 1.5 parts of silane coupling agent were put into an internal mixer and mixed for 45 seconds at a mixer speed of 50 rpm and a top bolt pressure of 50 N / cm. 2 , lift the top bolt twice, hold for 10 seconds each time, and when the mixing temperature reaches 150℃, discharge the rubber and get a masterbatch;

[0039] Put a masterbatch, 24 parts of carbon black, 3 parts of zinc oxide, 2 parts of stearic acid, 8 parts of modified anti-slip resin, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, and 1.5 parts of protective wax into an internal mixer and mix for 20 seconds. The internal mixer speed is 45 rpm and the upper bolt pressure is 50 N / cm 2 When the mixing temperature is 160℃, the rubber is discharged and the sheet is obtained to obtain the second-stage masterbatch;

[0040] Put the second-stage masterbatch, 1.5 parts of sulfur and 1.4 parts of accelerator NS into the internal mixer and mix for 25 seconds. The internal mixer speed is 23 rpm and the upper bolt pressure is 42 N / cm 2 When the mixing temperature is 105℃, the rubber is discharged into sheets to obtain the tread rubber. Example 3

[0041] 60 parts of natural rubber, 5 parts of neodymium-based butadiene rubber, 35 parts of double glass transition temperature solution-polymerized styrene-butadiene rubber, 24 parts of carbon black, 15 parts of high specific surface area white carbon black and 1.5 parts of silane coupling agent were put into an internal mixer and mixed for 45 seconds at a mixer speed of 50 rpm and a top bolt pressure of 50 N / cm. 2 , lift the top bolt twice, hold for 10 seconds each time, and when the mixing temperature reaches 150℃, discharge the rubber and get a masterbatch;

[0042] Put a masterbatch, 24 parts of carbon black, 3 parts of zinc oxide, 2 parts of stearic acid, 8 parts of modified anti-slip resin, 1.2 parts of antioxidant 4020, 1.2 parts of antioxidant RD, and 1.5 parts of protective wax into an internal mixer and mix for 20 seconds. The internal mixer speed is 45 rpm and the upper bolt pressure is 50 N / cm 2 When the mixing temperature reaches 160℃, the rubber is discharged and the sheet is obtained to obtain the second-stage masterbatch;

[0043] Put the second stage masterbatch, 1.5 parts of sulfur and 1.4 parts of accelerator NS into the internal mixer and mix for 25 seconds. The internal mixer speed is 22 rpm and the upper bolt pressure is 42 N / cm 2 When the mixing temperature is 105℃, the rubber is discharged into sheets to obtain the tread rubber. Example 4

[0044] 65 parts of natural rubber, 15 parts of neodymium-based butadiene rubber, 20 parts of double glass transition temperature solution-polymerized styrene-butadiene rubber, 23 parts of carbon black, 20 parts of high specific surface area white carbon black and 2.4 parts of silane coupling agent were put into an internal mixer and mixed for 45 seconds at a mixer speed of 50 rpm and a top bolt pressure of 50 N / cm. 2 , lift the top bolt twice, hold for 10 seconds each time, and when the mixing temperature reaches 150℃, discharge the rubber and get a masterbatch;

[0045] Put a masterbatch, 23 parts of carbon black, 3 parts of zinc oxide, 2 parts of stearic acid, 10 parts of modified anti-slip resin, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, and 1.5 parts of protective wax into an internal mixer and mix for 10-30 seconds. The internal mixer speed is 45 rpm and the upper bolt pressure is 50 N / cm 2 When the mixing temperature reaches 160℃, the rubber is discharged and the sheet is obtained to obtain the second-stage masterbatch;

[0046] Put the second stage masterbatch, 1.5 parts of sulfur and 1.4 parts of accelerator NS into the internal mixer and mix for 25 seconds. The internal mixer speed is 22 rpm and the upper bolt pressure is 42 N / cm 2 When the mixing temperature is 105℃, the rubber is discharged into sheets to obtain the tread rubber. Example 5

[0047] 60 parts of natural rubber, 15 parts of neodymium-based butadiene rubber, 25 parts of double glass transition temperature solution-polymerized styrene-butadiene rubber, 23 parts of carbon black, 20 parts of high specific surface area white carbon black and 2.4 parts of silane coupling agent were put into an internal mixer and mixed for 45 seconds. The internal mixer speed was 50 rpm and the upper bolt pressure was 50 N / cm 2 , lift the top bolt twice, hold for 10 seconds each time, and when the mixing temperature reaches 150℃, discharge the rubber and get a masterbatch;

[0048] Put a masterbatch, 23 parts of carbon black, 3 parts of zinc oxide, 2 parts of stearic acid, 10 parts of modified anti-slip resin, 1.3 parts of antioxidant 4020, 1.3 parts of antioxidant RD, and 1.5 parts of protective wax into an internal mixer and mix for 20 seconds. The internal mixer speed is 45 rpm and the upper bolt pressure is 50 N / cm 2 When the mixing temperature is 160℃, the rubber is discharged and the sheet is obtained to obtain the second-stage masterbatch;

[0049] Put the second stage masterbatch, 1.4 parts of sulfur and 1.5 parts of accelerator NS into the internal mixer and mix for 25 seconds. The internal mixer speed is 22 rpm and the upper bolt pressure is 42 N / cm 2 When the mixing temperature is 105℃, the rubber is discharged into sheets to obtain the tread rubber.

[0050] Comparative Example 1

[0051] 70 parts of natural rubber, 15 parts of neodymium-based butadiene rubber, 15 parts of low glass transition temperature solution-polymerized styrene-butadiene rubber, 24 parts of carbon black, 15 parts of highly dispersed silica and 1.2 parts of silane coupling agent were put into an internal mixer and mixed for 45 seconds at a mixer speed of 50 rpm and a top bolt pressure of 50 N / cm. 2 , lift the top bolt twice, hold for 10 seconds each time, and when the mixing temperature reaches 150℃, discharge the rubber and get a masterbatch;

[0052] Put a masterbatch, 24 parts of carbon black, 3 parts of zinc oxide, 2 parts of stearic acid, 8 parts of anti-slip resin, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, and 1.5 parts of protective wax into an internal mixer and mix for 20 seconds. The internal mixer speed is 45 rpm and the upper bolt pressure is 50 N / cm 2 When the mixing temperature is 160℃, the rubber is discharged and the sheet is obtained to obtain the second-stage masterbatch;

[0053] Put the second stage masterbatch, 1.6 parts of sulfur and 1.3 parts of accelerator NS into the internal mixer and mix for 25 seconds. The internal mixer speed is 22 rpm and the upper bolt pressure is 42 N / cm 2 When the mixing temperature is 105℃, the rubber is discharged into sheets to obtain the tread rubber.

[0054] Table 1: Composition of Comparative Example 1 and Examples 1-5

[0055]

[0056] The tread rubber, as specified in Table 1, was prepared in a BR Banbury internal mixer using three separate mixing stages: two non-productive mixing stages and one productive mixing stage. The two non-productive mixing stages were completed with mixing lasting approximately 2-3 minutes, until the rubber temperature reached 150-155°C and 155-165°C, respectively. The productive mixing stage was completed with mixing lasting approximately 1-1.5 minutes, until the rubber temperature reached 100-110°C.

[0057] Table 2 Mechanical and physical properties of Comparative Example 1 and Examples 1-5

[0058]

[0059] Table 2 lists the physical and mechanical properties of the comparative examples and examples. All properties of the rubber compounds were tested in accordance with national or industry standards, with the vulcanization conditions being 151°C for 30 min. Dynamic mechanical properties were characterized by temperature sweeps of the vulcanized rubber using a dynamic viscoelastic spectrum analyzer (DMA) manufactured by GABO, Germany. The test conditions were compression mode, 10 Hz frequency, 5% static strain, 0.2% dynamic strain, a temperature range of -70°C to 70°C, and a heating rate of 2°C / min.

[0060] Usually, the elastic modulus E' at -25℃ is used to characterize the grip on ice and snow. The lower the value, the lower the modulus and the better the grip on ice and snow. The tanδ at 0℃ is used to characterize the anti-skid performance. The higher the value, the stronger the anti-skid performance. The tanδ at 60℃ is used to characterize the heat generation performance of the rubber. The lower the value, the lower the heat generation of the rubber, that is, the lower the rolling resistance of the tire.

[0061] As can be seen from Table 2 and Figure 1, solution-polymerized styrene-butadiene rubber with a low peak double glass transition temperature Tg can adjust the Tg and DMA curve peak shape of the tread rubber, lower the Tg of the tread rubber, increase tanδ at -25°C and 0°C, reduce E' at -25°C, and reduce tanδ at 60°C, thereby improving the tread rubber's ice and snow grip and anti-wet skid performance, reducing heat generation and improving wear resistance; high-specific area silica can pierce the water film and improve the reinforcement effect of the rubber composite material, making it anti-wet skid and more wear-resistant; modified styrene and dicyclopentadiene copolymer resin can improve anti-wet skid performance and reduce rolling resistance.

[0062] Table 3 Performance test data of 12R22.5 specification all-steel snow tires produced with tread rubber of Comparative Example 1 and Example 5

[0063]

[0064] Table 3 shows the performance test data for 12R22.5 all-steel snow tires produced using the tread rubbers of Comparative Example 1 and Example 5. Tire rolling resistance was tested at the National Engineering Laboratory, snow performance was tested at the Heilongjiang Red River Valley Automobile Testing Center according to ECE-R117 regulations, and tire wear performance was tested in accordance with GB / T 29041-2012.

[0065] As can be seen from Table 3, the all-steel snow tire produced with the tread rubber prepared in Example 5 has obvious advantages in rolling resistance, wet skid performance, snow performance, wear resistance, etc., and can achieve the optimal balance of various performance indicators of the tread rubber.

[0066] In summary, the present invention utilizes low-peak dual-glass transition temperature solution-polymerized styrene-butadiene rubber, high-area silica, modified styrene and dicyclopentadiene copolymer resin, and optimizes the ratios of the components of the formulation system to prepare an all-steel tread rubber composition having two glass transition temperatures, Tg1 and Tg2, with Tg1 ≤ -60°C, excellent low-temperature resistance, and meeting the conditions for use in severely cold regions; -40°C ≤ Tg2 ≤ -20°C, low E' at -25°C (good ice and snow grip), high tanδ at 0°C (high wet grip performance), and superior grip performance on wet and icy roads; low tanδ at 60°C (low heat generation of the rubber compound), and wear resistance improved by more than 30% compared to the prior art, meeting the high-performance requirements for tire safety in severely cold, rainy and snowy climates, as well as fuel efficiency and high wear resistance in normal weather.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A non-slip all-steel truck tire tread rubber composition, characterized in that, Composed of the following raw materials by weight parts: 60 - 70 parts of natural rubber, 5 - 15 parts of neodymium cis - 1,4 - polybutadiene rubber, 15 - 35 parts of solution - polymerized styrene - butadiene rubber with double glass transition temperatures, 45 - 60 parts of carbon black, 10 - 20 parts of high - specific - surface - area silica, 1.2 - 2.5 parts of silane coupling agent, 8 - 10 parts of modified anti - wet - skid resin, 2 - 5 parts of zinc oxide, 1 - 3 parts of stearic acid, 1 - 3 parts of antioxidant 4020, 1 - 3 parts of antioxidant RD, 1 - 3 parts of protective wax, 1 - 1.8 parts of sulfur, 1 - 1.5 parts of accelerator NS.

2. The anti-slip all-steel truck tire tread rubber composition according to claim 1, wherein, The solution - polymerized styrene - butadiene rubber with double glass transition temperatures has double glass transition temperatures. Its first Tg is less than - 70 °C, the second Tg ranges from - 55 °C to - 35 °C, and the peak value of its loss factor is lower than that of ordinary solution - polymerized styrene - butadiene rubber with a single glass transition temperature and a low glass transition temperature.

3. The tread rubber composition of an anti-slip all-steel heavy-duty truck tire according to claim 1, characterized in that, The carbon black is N115 or N220.

4. A tread rubber composition for a non-slip all-steel heavy-duty truck tire according to claim 1, characterized in that, The specific surface area of the high specific surface area precipitated silica is measured by BET to be 220 - 300 m 2 / g, and the dibutyl phthalate absorption value is 250 - 300 cm 3 / 100 g.

5. The tread rubber composition of an anti-slip all-steel heavy-duty truck tire according to claim 1, characterized in that, The silane coupling agent is Si - 75, and the weight - part ratio of it to the high - specific - surface - area silica is 1:10 - 1.4:

10.

6. The tread rubber composition of a non-slip all-steel heavy-duty truck tire according to claim 1, characterized in that, The modified anti - wet resin is a copolymer resin of modified styrene and dicyclopentadiene.

7. The tread rubber composition of a non-slip all-steel heavy-duty truck tire according to claim 1, wherein, The preparation method of the anti - skid all - steel truck tire tread rubber composition is carried out according to the following steps: (a)Put natural rubber, neodymium-based cis-butadiene rubber, solution-polymerized styrene-butadiene rubber with double glass transition temperatures, part of carbon black, high specific surface area white carbon black and silane coupling agent into a mixer and knead for 40 - 50 s, the mixer speed is 40 - 55 rpm, and the upper plug pressure is 45 - 55 N / cm 2 , lift the upper plug twice, each time for 5 - 10 s, and discharge the rubber and cut into sheets when the kneading temperature is 150 - 155 °C to obtain the first-stage masterbatch; (b) Put a section of masterbatch and the remaining carbon black, zinc oxide, stearic acid, modified anti-wet skid resin, antioxidant 4020, antioxidant RD, and protective wax into a mixer and knead for 10 - 30 s. The mixer speed is 45 - 50 rpm, and the upper plug pressure is 45 - 55 N / cm 2 , and discharge the rubber and take out the sheet at a kneading temperature of 155 - 165 °C to obtain the second-stage masterbatch; (c) Put the second-stage masterbatch, sulfur, and accelerator NS into the internal mixer and knead for 20 - 30 s. The rotational speed of the internal mixer is 20 - 25 rpm, and the pressure of the upper plug is 40 - 45 N / cm 2 , and discharge the rubber and sheet it out to obtain the tread rubber when the kneading temperature is 100 - 110 °C.

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