A tire tread rubber composite material based on high extraction resistance liquid rubber and preparation method thereof

Abstract

A tire tread rubber composite material based on high extraction resistance liquid rubber and a preparation method thereof. The present invention belongs to the field of rubber materials and their preparation. The purpose of the present invention is to solve the technical problems of poor extraction resistance and decreased mechanical properties of traditional plasticizers. The material of the present invention is prepared from olefin rubber, iron-based butyl-pentane liquid rubber, zinc oxide, plasticizer, sulfur, accelerator and antioxidant, and the olefin rubber is mixed with natural rubber, butadiene rubber, styrene-butadiene rubber and iron-based butyl-pentane rubber, and the molecular weight of the iron-based butyl-pentane liquid rubber is 0.5-5w, and the total content of vinyl side groups and propenyl side groups is 30-60%. The present invention introduces iron-based butyl-pentane liquid rubber into the rubber formula, while ensuring the processing performance of the rubber composite material, the extraction resistance rate is increased by 70%, and the mechanical properties of the rubber material are improved, the tensile properties are increased by about 10.34%, and the tear resistance is increased by about 11.54%.

Description

Technical Field

[0001] The invention belongs to the field of rubber materials and preparation thereof, and in particular relates to a tire tread rubber composite material based on highly extraction-resistant liquid rubber and a preparation method thereof. Background Art

[0002] The rubber industry has developed into one of the important pillar industries of my country's national economy. As the largest production and consumption market of tires, the research and development of high-performance tires is of great significance to improving product competitiveness.

[0003] As one of the five major systems of rubber, the plasticizing system has an important influence on the processing performance and use performance of the product. With the deepening of green environmental protection concepts and the increasing depletion of fossil energy, the need to find a safe and environmentally friendly new plasticizer is becoming increasingly urgent. Due to the poor extraction resistance of traditional plasticizers, it has never been possible to break through the "devil's triangle" in tire manufacturing, which in turn leads to problems such as the inability of rubber products for tires to have excellent processing performance and mechanical properties. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of poor extraction resistance and decreased mechanical properties of traditional plasticizers, and to provide a liquid rubber composite material with high extraction resistance and a preparation method thereof.

[0005] The tire tread rubber composite material based on high extraction resistance liquid rubber of the present invention is prepared from the following components in parts by weight:

[0006] 100 parts of olefin rubber;

[0007] 5-40 parts of iron-based butylene-pentadiene liquid rubber;

[0008] Reinforcing filler 20-90 parts;

[0009] Zinc oxide 1-5 parts;

[0010] 0.5-5 parts of stearic acid;

[0011] Plasticizer 0-20 parts;

[0012] 1-3 parts of sulfur;

[0013] Accelerator 0.5-5 parts;

[0014] Anti-aging agent 0.5-5 parts;

[0015] The olefin rubber is mixed by weight of 0-30 parts of natural rubber, 0-30 parts of butadiene rubber, 0-70 parts of styrene-butadiene rubber and 5-70 parts of iron-based butadiene-elastomer rubber, wherein the parts of natural rubber and butadiene rubber are not 0 at the same time, the molecular weight of the iron-based butadiene-elastomer liquid rubber is 0.5-5w, and the total content of vinyl side groups and propenyl side groups is 30-60%.

[0016] It is further defined that the glass transition temperature of the iron-based N-butylene-pentadiene liquid rubber is from -70°C to -40°C.

[0017] It is further defined that the iron-based butadiene-pentadiene liquid rubber is made from butadiene monomer and isoprene monomer in a molar ratio of (0.5-2):1.

[0018] It is further defined that the iron-based butadiene-pentadiene rubber is composed of butadiene structural units and isoprene structural units, the molar content of 1,2-butadiene in the butadiene structural units is 30-60%, the molar content of 1,4-butadiene is 40-70%, the molar content of 3,4-isoprene in the isoprene structural units is 30-60%, and the molar content of 1,4-isoprene is 40-70%.

[0019] It is further defined that the reinforcing filler is one of carbon black and white carbon black or a mixture of the two in any ratio.

[0020] It is further defined that the carbon black is one or a mixture of any proportions of contact carbon black, furnace carbon black, thermal carbon black and new process carbon black.

[0021] It is further defined that white carbon black is a mixture of one or more of fumed white carbon black and precipitated white carbon black in any ratio.

[0022] It is further defined that the plasticizer is one or a mixture of any ratio of aromatic oil, cyclohexane oil, paraffin oil, coal tar and naphtha.

[0023] It is further defined that the accelerator is one or a mixture of any ratio of sulfonamide, thiazole, thiuram, thiourea, dithiocarbamate, aldehyde amine, guanidine and xanthate accelerators.

[0024] It is further defined that the antioxidant is one or a mixture of any proportion of quinolines, p-phenylenediamines, naphthylamines, aromatic amines, amines, phenols, and aromatic amines.

[0025] The preparation method of a tire tread rubber composite material based on high extraction resistance liquid rubber of the present invention is carried out according to the following steps:

[0026] Step 1: Add olefin rubber and iron-based butadiene-pentadiene rubber into an internal mixer for mixing, mix at 120-135° C. for 180-240 seconds, let stand for more than 4 hours, then add iron-based butadiene-pentadiene liquid rubber, reinforcing filler, zinc oxide, stearic acid, plasticizer, coupling agent and antioxidant, mix at 135-150° C. for 240-300 seconds to obtain a mixed rubber;

[0027] Step 2: Add sulfur and an accelerator to the mixed rubber and continue mixing to obtain a tire tread rubber composite material based on a highly extraction-resistant liquid rubber.

[0028] Compared with the prior art, the present invention has the following significant effects:

[0029] 1) The present invention introduces iron-based butyl pentane liquid rubber into the rubber formula, thereby ensuring the processing performance of the rubber composite material and increasing the extraction resistance by 70%. At the same time, the mechanical properties of the rubber material are improved, the tensile performance is increased by about 10.34%, and the tear resistance is increased by about 11.54%.

[0030] 2) The present invention introduces iron-based butyl pentane liquid rubber into the rubber formula, thereby improving the anti-skid performance of the rubber composite material by about 10.44% and reducing the rolling resistance of the rubber composite material by about 12.96%, thereby improving the safety and fuel economy of tire use.

[0031] 3) The present invention introduces iron-based butylene-pentane liquid rubber into the rubber formula, which can reduce the Mooney value and glass transition temperature of the mixed rubber while using a smaller amount, and the plasticizing effect is significantly improved compared with aromatic oil; aromatic oil needs to be used in an increased amount to achieve the same effect, resulting in a loss of mechanical properties.

[0032] 4) Compared with aromatic oil, the iron-based butadiene-pentadiene liquid rubber in the rubber formula of the present invention has a high structural similarity with the rubber matrix (especially the iron-based butadiene-pentadiene rubber in the system), so it has better compatibility in the system, the plasticizing effect is significantly improved compared with aromatic oil, the mixing processing performance is improved, the agglomerates of the reinforcing filler in the rubber matrix are reduced, the dispersion is uniform, and the reinforcement effect is improved; in addition, the relative molecular mass of the iron-based butadiene-pentadiene liquid rubber is much greater than that of the aromatic oil, the force between the molecular chains is increased, and the strain resistance is improved; at the same time, the iron-based butadiene-pentadiene liquid rubber has carbon-carbon double bonds on the molecular chain, participates in vulcanization crosslinking during the vulcanization process of the rubber composite material, the extraction resistance is improved, the crosslinking density of the vulcanized product is increased, and the performance is improved.

[0033] 5) The 3,4-propylene group in the rubber system of the present invention has an electron-donating side methyl group connected to the double bond carbon, which increases the activity of α-H and reduces the double bond dissociation energy, forming carbon anions that interact with the surface of the reinforcing filler, thereby improving the dispersion effect of the reinforcing filler in the rubber matrix, destroying the agglomeration between the fillers, and reducing the filler-filler grid. When the tire is deformed under stress, the friction between the fillers is reduced, the resistance to the movement between the molecules is reduced, and the rolling resistance is reduced. On the other hand, the iron-based butadiene-pentadiene liquid rubber has a low relative molecular mass and a low glass transition temperature. During the deformation process, the internal friction of the rubber composite material is reduced, the hysteresis loss is reduced, and the rolling resistance is further reduced.

[0034] 6) The addition of iron-based butadiene-pentadiene liquid rubber increases the multiplicity of moving units in the rubber composite material. At the same time, the presence of side groups increases the number of molecular chains in contact with the ground when the tire is running, thereby improving the anti-skid performance. The glass transition temperature range is narrow, and the "frozen" molecular chain segments can puncture the water film on the tire surface, increasing the contact between the tire and the ground. Under lower temperature changes, the molecular chain segments are "thawed", the hysteresis effect is enhanced, and the loss modulus is increased, which together improve the anti-skid performance. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents, methods and instruments used are conventional materials, reagents, methods and instruments in the art unless otherwise specified, and can be obtained through commercial channels by those skilled in the art.

[0037] The terms "comprising," "including," "having," "containing," or any other variations thereof, as used in the following examples, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus comprising the listed elements is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.

[0038] When equivalent, concentration or other value or parameter is represented by the range limited by range, preferred range or a series of upper preferred value and lower preferred value, this should be understood as specifically disclosing all ranges formed by any pairing of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether the scope is disclosed separately. For example, when disclosing range "1 to 5", described range should be interpreted as including range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When numerical range is described in this article, unless otherwise stated, the scope is intended to include its end value and all integers and fractions within the scope. In the present application specification and claims, range limitation can be combined and / or interchanged, if these ranges are not otherwise stated, include all sub-ranges contained therein.

[0039] The indefinite articles "a" and "an" before the elements or components of the present invention have no limitation on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the quantity obviously refers to the singular form only.

[0040] Example 1: The formula of the tire tread rubber composite material based on high extraction resistance liquid rubber of this example is shown in Table 1, and the performance test results are shown in Table 2;

[0041] Among them, the molecular weight of the iron-based butyl-pentene rubber is 30.1w, and it is made of butadiene monomer and isoprene monomer in a molar ratio of 3:7, and the total content of vinyl side groups and propenyl side groups is 43%;

[0042] The molecular weight of the iron-based butyl pentane liquid rubber is 2.1w, the total content of vinyl side groups and propylene side groups is 31%, the glass transition temperature of the iron-based butyl pentane liquid rubber is -56°C, and the iron-based butyl pentane liquid rubber is an iron-based butyl pentane liquid rubber that does not contain gel;

[0043] The iron-based butadiene-pentadiene liquid rubber is prepared from butadiene monomer and isoprene monomer in a molar ratio of 1:1. The iron-based butadiene-pentadiene liquid rubber consists of butadiene structural units and isoprene structural units. The molar content of 1,2-butadiene in the butadiene structural units is 31%, and the sum of the molar contents of cis-1,4-butadiene and trans-1,4-butadiene is 69%. The molar content of 3,4-isoprene in the isoprene structural units is 31%, and the sum of the molar contents of cis-1,4-isoprene and trans-1,4-isoprene is 69%.

[0044] The preparation method of the tire tread rubber composite material based on high extraction resistance liquid rubber is carried out according to the following steps:

[0045] Step 1: Add olefin rubber to an internal mixer for mixing, the filling factor is 0.7, mix at 130°C for 240 seconds, let stand for more than 4 hours, then add iron-based butylene-pentane liquid rubber, reinforcing filler, zinc oxide, stearic acid, plasticizer, coupling agent and antioxidant, the filling factor is 0.72, mix at 140°C for 300 seconds to obtain a mixed rubber;

[0046] Step 2: Add sulfur and an accelerator to the mixed rubber and continue mixing to obtain a tire tread rubber composite material based on a highly extraction-resistant liquid rubber.

[0047] Example 2: The formula of the tire tread rubber composite material based on high extraction resistance liquid rubber of this example is shown in Table 1, and the performance test results are shown in Table 2;

[0048] Among them, the molecular weight of the iron-based butyl-pentene rubber is 32.3w, and it is made of butadiene monomer and isoprene monomer in a molar ratio of 3:7, and the total content of vinyl side groups and propenyl side groups is 42%;

[0049] The molecular weight of the iron-based butyl pentane liquid rubber is 2.7w, the total content of vinyl side groups and propylene side groups is 39%, the glass transition temperature of the iron-based butyl pentane liquid rubber is -45°C, and the iron-based butyl pentane liquid rubber is an iron-based butyl pentane liquid rubber that does not contain gel;

[0050] The iron-based butadiene-pentadiene liquid rubber is prepared from butadiene monomer and isoprene monomer in a molar ratio of 1:1. The iron-based butadiene-pentadiene liquid rubber consists of butadiene structural units and isoprene structural units. The molar content of 1,2-butadiene in the butadiene structural units is 38%, the sum of the molar contents of cis-1,4-butadiene and trans-1,4-butadiene is 62%, the molar content of 3,4-isoprene in the isoprene structural units is 40%, and the sum of the molar contents of cis-1,4-isoprene and trans-1,4-isoprene is 60%.

[0051] The preparation method of the tire tread rubber composite material based on high extraction resistance liquid rubber is carried out according to the following steps:

[0052] Step 1: Add olefin rubber to an internal mixer for mixing, the filling factor is 0.69, mix at 135°C for 240 seconds, let stand for more than 4 hours, then add iron-based butylene-pentane liquid rubber, reinforcing filler, zinc oxide, stearic acid, plasticizer, coupling agent and antioxidant, the filling factor is 0.73, mix at 145°C for 300 seconds to obtain a mixed rubber;

[0053] Step 2: Add sulfur and an accelerator to the mixed rubber and continue mixing to obtain a tire tread rubber composite material based on a highly extraction-resistant liquid rubber.

[0054] Example 3: The formula of the tire tread rubber composite material based on high extraction resistance liquid rubber of this example is shown in Table 1, and the performance test results are shown in Table 2;

[0055] Among them, the molecular weight of the iron-based butyl-pentene rubber is 35.9w, and it is made of butadiene monomer and isoprene monomer in a molar ratio of 3:7, and the total content of vinyl side groups and propenyl side groups is 38%;

[0056] The molecular weight of the iron-based butyl pentane liquid rubber is 2.5w, the total content of vinyl side groups and propylene side groups is 34%, the glass transition temperature of the iron-based butyl pentane liquid rubber is -48°C, and the iron-based butyl pentane liquid rubber is an iron-based butyl pentane liquid rubber that does not contain gel;

[0057] The iron-based butadiene-pentadiene liquid rubber is prepared from butadiene monomer and isoprene monomer in a molar ratio of 1:1. The iron-based butadiene-pentadiene liquid rubber consists of butadiene structural units and isoprene structural units. The molar content of 1,2-butadiene in the butadiene structural units is 36%, and the sum of the molar contents of cis-1,4-butadiene and trans-1,4-butadiene is 64%. The molar content of 3,4-isoprene in the isoprene structural units is 32%, and the sum of the molar contents of cis-1,4-isoprene and trans-1,4-isoprene is 68%.

[0058] The preparation method of the tire tread rubber composite material based on high extraction resistance liquid rubber is carried out according to the following steps:

[0059] Step 1: Add olefin rubber to an internal mixer for mixing, the filling factor is 0.73, mix at 129°C for 240s, let stand for more than 4h, then add iron-based butylene-pentane liquid rubber, reinforcing filler, zinc oxide, stearic acid, plasticizer, coupling agent and antioxidant, the filling factor is 0.75, mix at 142°C for 300s to obtain a mixed rubber;

[0060] Step 2: Add sulfur and an accelerator to the mixed rubber and continue mixing to obtain a tire tread rubber composite material based on a highly extraction-resistant liquid rubber.

[0061] Example 4: The formula of the tire tread rubber composite material based on high extraction resistance liquid rubber of this example is shown in Table 1, and the performance test results are shown in Table 2;

[0062] Among them, the molecular weight of the iron-based butyl-pentene rubber is 29.7w, and it is made of butadiene monomer and isoprene monomer in a molar ratio of 3:7, and the total content of vinyl side groups and propenyl side groups is 41%;

[0063] The molecular weight of the iron-based butyl pentane liquid rubber is 2.3w, the total content of vinyl side groups and propylene side groups is 33%, the glass transition temperature of the iron-based butyl pentane liquid rubber is -52°C, and the iron-based butyl pentane liquid rubber is an iron-based butyl pentane liquid rubber that does not contain gel;

[0064] The iron-based butadiene-pentadiene liquid rubber is prepared from butadiene monomer and isoprene monomer in a molar ratio of 1:1. The iron-based butadiene-pentadiene liquid rubber consists of butadiene structural units and isoprene structural units. The molar content of 1,2-butadiene in the butadiene structural units is 31%, and the sum of the molar contents of cis-1,4-butadiene and trans-1,4-butadiene is 69%. The molar content of 3,4-isoprene in the isoprene structural units is 35%, and the sum of the molar contents of cis-1,4-isoprene and trans-1,4-isoprene is 65%.

[0065] The preparation method of the tire tread rubber composite material based on high extraction resistance liquid rubber is carried out according to the following steps:

[0066] Step 1: Add olefin rubber to an internal mixer for mixing, the filling factor is 0.75, mix at 132°C for 240 seconds, let stand for more than 4 hours, then add iron-based butylene-pentane liquid rubber, reinforcing filler, zinc oxide, stearic acid, plasticizer, coupling agent and antioxidant, the filling factor is 0.76, mix at 146°C for 300 seconds to obtain a mixed rubber;

[0067] Step 2: Add sulfur and an accelerator to the mixed rubber and continue mixing to obtain a tire tread rubber composite material based on a highly extraction-resistant liquid rubber.

[0068] Comparative Example 1: This comparative example is different from Example 1 in that: no iron-based butylene-pentane liquid rubber is added, the aromatic oil TDAE is 20 parts, and the specific formula is shown in Table 1;

[0069] The preparation method is as follows:

[0070] Step 1: Add olefin rubber to an internal mixer for mixing, the filling factor is 0.71, mix at 125°C for 240 seconds, let stand for more than 4 hours, then add reinforcing filler, zinc oxide, stearic acid, plasticizer, coupling agent and antioxidant, the filling factor is 0.73, mix at 141°C for 300 seconds, and obtain a mixed rubber;

[0071] Step 2: Add sulfur and accelerator to the mixed rubber and continue mixing to obtain a tire tread rubber composite material.

[0072] Comparative Example 2: This comparative example is different from Example 1 in that: no iron-based butylene-pentane liquid rubber is added, the aromatic oil TDAE is 35 parts, and the specific formula is shown in Table 1;

[0073] The preparation method is as follows:

[0074] Step 1: Add olefin rubber to an internal mixer for mixing, the filling factor is 0.71, mix at 125°C for 240 seconds, let stand for more than 4 hours, then add reinforcing filler, zinc oxide, stearic acid, plasticizer, coupling agent and antioxidant, the filling factor is 0.73, mix at 141°C for 300 seconds, and obtain a mixed rubber;

[0075] Step 2: Add sulfur and accelerator to the mixed rubber and continue mixing to obtain a tire tread rubber composite material.

[0076] Comparative Example 3: The formula of the tire tread rubber composite material of this comparative example is shown in Table 1, and the performance test results are shown in Table 2;

[0077] Among them, the molecular weight of the iron-based butyl-pentene rubber is 30.1w, and it is made of butadiene monomer and isoprene monomer in a molar ratio of 3:7, and the total content of vinyl side groups and propenyl side groups is 43%;

[0078] The molecular weight of the iron-based butyl pentane liquid rubber is 2.48w, the total content of vinyl side groups and propylene side groups is 33%, the glass transition temperature of the iron-based butyl pentane liquid rubber is -49°C, and the iron-based butyl pentane liquid rubber is an iron-based butyl pentane liquid rubber that does not contain gel;

[0079] The iron-based butadiene-pentadiene liquid rubber is prepared from butadiene monomer and isoprene monomer in a molar ratio of 1:1. The iron-based butadiene-pentadiene liquid rubber consists of butadiene structural units and isoprene structural units. The molar content of 1,2-butadiene in the butadiene structural units is 34%, and the sum of the molar contents of cis-1,4-butadiene and trans-1,4-butadiene is 66%. The molar content of 3,4-isoprene in the isoprene structural units is 32%, and the sum of the molar contents of cis-1,4-isoprene and trans-1,4-isoprene is 68%.

[0080] The preparation method of the tire tread rubber composite material is carried out according to the following steps:

[0081] Step 1: Add olefin rubber to an internal mixer for mixing, the filling factor is 0.72, mix at 130°C for 240 seconds, let stand for more than 4 hours, then add iron-based butylene-pentane liquid rubber, reinforcing filler, zinc oxide, stearic acid, plasticizer, coupling agent and antioxidant, the filling factor is 0.73, mix at 145°C for 300 seconds to obtain a mixed rubber;

[0082] Step 2: Add sulfur and accelerator to the mixed rubber and continue mixing to obtain a tire tread rubber composite material.

[0083] Table 1 Formulation of rubber composite materials

[0084]

[0085]

[0086] Table 2 Rubber composite material properties

[0087] Performance parameters Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 <![CDATA[M L ]]> 1.156 1.187 1.124 1.091 1.134 0.975 1.567 <![CDATA[M H ]]> 9.137 9.596 9.841 10.257 8.923 6.324 15.763 <![CDATA[t 90 ,min]]> 16.60 17.80 19.20 20.10 14.30 13.40 31.20 ML(1+4)100℃ 71.2 68.7 64.3 60.5 75.4 61.3 36.2 Tensile strength, MPa 16.79 17.25 17.67 18.03 16.34 10.37 12.38 100% tensile stress, MPa 2.67 2.59 2.71 2.74 2.63 1.74 3.63 300% tensile stress, MPa 14.43 15.61 18.67 19.31 11.72 5.62 13.89 Elongation at break, % 442.27 412.35 389.16 356.31 483.17 634.45 312.56 Shore A Hardness 59 59 59 60 59 53 66 Tear strength, KN / m 31.9 32.6 33.3 34.8 31.2 21.8 26.7 <![CDATA[DIN wear, mm 3 / 40m]]> 0.1802 0.1794 0.1811 0.1789 0.1797 0.2053 0.1982 Tg, ℃ -19.57 -21.64 -23.03 -25.92 -18.21 -24.34 -28.61 0℃tanδ 0.372 0.385 0.391 0.402 0.364 0.274 0.439 60℃tanδ 0.105 0.101 0.098 0.094 0.108 0.088 0.172 Solvent extraction rate, % 0.0077 0.0056 0.0041 0.0028 0.0095 0.0138 0.0036

[0088] Analysis of the data in Table 2 shows that the addition of iron-based butyl pentane liquid rubber, whether it partially or completely replaces aromatic oil, compared with the control example, the tensile and tearing mechanical properties of the composite material are excellent, the DIN wear value remains unchanged, especially the 0℃ tanδ remains at a high level while the 60℃ tanδ is significantly reduced, and the solvent extraction resistance remains at a high level. The iron-based butyl pentane liquid rubber is used as a plasticizer, and the mechanical properties of the material are greatly improved. At the same time, while keeping the wear value unchanged, the anti-skid performance is greatly improved, and the rolling resistance is significantly reduced. It has a clear application prospect in the manufacture of high-performance tire tread rubber.

[0089] This is mainly due to: 1) compared with aromatic oil, the iron-based butadiene-pentadiene liquid rubber in the rubber formula of the present invention has a high structural similarity with the rubber matrix (especially the iron-based butadiene-pentadiene rubber in the system), so it has better compatibility in the system, the plasticizing effect is significantly higher than that of aromatic oil, the mixing processing performance is improved, the agglomerates of the reinforcing filler in the rubber matrix are reduced, the dispersion is uniform, and the reinforcement effect is improved; in addition, the relative molecular mass of the iron-based butadiene-pentadiene liquid rubber is much greater than that of aromatic oil, the interaction force between the molecular chains is increased, and the ability to resist strain is improved; at the same time, the iron-based butadiene-pentadiene liquid rubber has carbon-carbon double bonds on its molecular chain, which participates in vulcanization crosslinking during the vulcanization process of the rubber composite material, the extraction resistance is improved, the crosslinking density of the vulcanized product is increased, and the performance is improved.

[0090] 2) The 3,4-propylene group in the rubber system of the present invention has an electron-donating side methyl group connected to the double bond carbon, which increases the activity of α-H, reduces the double bond dissociation energy, forms carbon anions that interact with the surface of the reinforcing filler, improves the dispersion effect of the reinforcing filler in the rubber matrix, destroys the agglomeration between the fillers, reduces the filler-filler grid, and when the tire is deformed under stress, the friction between the fillers is reduced, reducing the resistance to movement between molecules and reducing the rolling resistance. On the other hand, the iron-based butadiene-pentadiene liquid rubber has a low relative molecular mass and a low glass transition temperature. During the deformation process, the internal friction of the rubber composite material is reduced, the hysteresis loss is reduced, and the rolling resistance is further reduced.

[0091] 3) The addition of iron-based butadiene-pentadiene liquid rubber increases the multiplicity of moving units in the rubber composite material. At the same time, the presence of side groups increases the number of molecular chains in contact with the ground when the tire is running, thereby improving the anti-skid performance. The glass transition temperature range is narrow, and the "frozen" molecular chain segments can puncture the water film on the tire surface, increasing the contact between the tire and the ground. Under lower temperature changes, the molecular chain segments are "thawed", the hysteresis effect is enhanced, and the loss modulus is increased, which together improves the anti-skid performance.

[0092] The above are only preferred specific embodiments of the present invention, which are all different implementations based on the overall concept of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A tire tread rubber composite material based on highly extractable liquid rubber, characterized in that: It is prepared from the following components by weight: 100 parts of olefin rubber; 5-40 parts of iron-based butylene-pentadiene liquid rubber; Reinforcing filler 20-90 parts; Zinc oxide 1-5 parts; 0.5-5 parts of stearic acid; Plasticizer 0-20 parts; 1-3 parts of sulfur; Accelerator 0.5-5 parts; Anti-aging agent 0.5-5 parts; The olefin rubber is mixed by weight of 0-30 parts of natural rubber, 0-30 parts of cis-1,4-butadiene rubber, 0-70 parts of styrene-butadiene rubber and 5-70 parts of iron-based butadiene-elastomer rubber, wherein the parts of natural rubber and butadiene rubber are not 0 at the same time, the molecular weight of the iron-based butadiene-elastomer rubber is 0.5-5w, the total content of vinyl side groups and propenyl side groups is 30-60%, and the iron-based butadiene-elastomer rubber is made of butadiene monomer and isoprene monomer in a molar ratio of (0.5-2):

1.

2. The tire tread rubber composite material based on highly extraction-resistant liquid rubber according to claim 1, characterized in that: The glass transition temperature of iron-based NBR liquid rubber is -70℃ to -40℃.

3. The tire tread rubber composite material based on highly extraction-resistant liquid rubber according to claim 1, characterized in that: Iron-based butadiene-pentadiene rubber is composed of butadiene structural units and isoprene structural units.

4. The tire tread rubber composite material based on highly extraction-resistant liquid rubber according to claim 3, characterized in that: The molar content of 1,2-butadiene in the butadiene structural unit is 30-60%, and the molar content of 1,4-butadiene is 40-70%. The molar content of 3,4-isoprene in the isoprene structural unit is 30-60%, and the molar content of 1,4-isoprene is 40-70%.

5. The tire tread rubber composite material based on highly extraction-resistant liquid rubber according to claim 1, characterized in that: The reinforcing filler is carbon black, white carbon black or a mixture of the two.

6. The tire tread rubber composite material based on highly extraction-resistant liquid rubber according to claim 5, characterized in that: The carbon black is one or a mixture of contact carbon black, furnace carbon black, thermal carbon black and new process carbon black.

7. The tire tread rubber composite material based on highly extraction-resistant liquid rubber according to claim 5, characterized in that: White carbon black is one or a mixture of fumed white carbon black and precipitated white carbon black.

8. The tire tread rubber composite material based on highly extraction-resistant liquid rubber according to claim 1, characterized in that: The plasticizer is one or a mixture of aromatic oil, cyclohexane oil, paraffin oil, coal tar and naphtha; the accelerator is one or a mixture of sulfonamide, thiazole, thiuram, thiourea, dithiocarbamate, aldehyde amine, guanidine and xanthate accelerators; the antioxidant is one or a mixture of quinoline, p-phenylenediamine, naphthylamine and phenol.

9. The method for preparing a tire tread rubber composite material based on highly resistant to extraction of liquid rubber according to any one of claims 1 to 8, characterized in that: The method proceeds as follows: Step 1: Add olefin rubber to an internal mixer for mixing, mix at 120-135° C. for 180-240 seconds, let stand for more than 4 hours, then add iron-based butylene-pentane liquid rubber, reinforcing filler, zinc oxide, stearic acid, plasticizer and antioxidant, mix at 135-150° C. for 240-300 seconds to obtain a mixed rubber; Step 2: Add sulfur and an accelerator to the mixed rubber and continue mixing to obtain a tire tread rubber composite material based on a highly extraction-resistant liquid rubber.

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