A wear-resistant large-scale new energy vehicle tire and its preparation method and application

Abstract

The present invention provides a wear-resistant large-scale new energy vehicle tire and a preparation method and application thereof, and relates to the technical field of tire manufacturing. The present invention provides a tread rubber that takes into account wear resistance, low rolling resistance and high hardness, and provides a new tread rubber material for large-scale new energy vehicles. In addition, the present invention uses GEMINI surfactant as a tread rubber surfactant for the first time, which solves the problem of low tensile strength under high temperature environment, so that the anti-aging and high temperature resistance of the tread rubber are further improved. The present invention also provides a preparation method of the tread rubber, wherein sodium carbonate is used for the first time in combination with microwave treatment to improve the dispersibility of the components in the tread rubber and improve the qualified rate in the preparation process. The present invention also provides a tire for a large-scale new energy vehicle containing the tread rubber, and the tire has better durability than commercially available tires.

Description

Technical Field

[0001] The present application relates to the field of tire manufacturing technology, and in particular to a wear-resistant large-scale new energy vehicle tire and a preparation method and application thereof. Background Art

[0002] Tires are important components of automobiles and important products of the rubber industry. They support loads and transmit braking, driving and steering forces to the ground. Domestic tire production has always been at the forefront of the world, and it is also one of the important industries of my country's national economy. According to the statistics of the Rubber Industry Association, the sales of the tire industry in 2016 were nearly 230 billion yuan, and the annual output of various automobile tires was nearly 610 million, accounting for about 40% of the world's total tire production.

[0003] At present, new energy vehicles are gradually entering the public eye due to their green and environmentally friendly characteristics. According to the latest data released by the China Association of Automobile Manufacturers in September 2018, the production and sales of new energy vehicles in August increased by 50% year-on-year and 20% month-on-month. From January to August, the production and sales of new energy vehicles increased by 75.4% and 88% respectively compared with the same period last year. On the other hand, the research on hub motor drive and wheel side motor drive is also in the ascendant, and the prototype will be launched soon. However, due to the increase in vehicle driving torque, the instantaneous speed of starting is accelerated, the tire wear increases sharply, the tread wear rate increases by 100%, and the tire mileage is only 50% or even lower than that of traditional fuel vehicles. In large new energy vehicles, this problem is even more serious. The impact of the hub or wheel side motor drive mode on tire wear is expected to be more challenging than that of new energy vehicles. Therefore, it is urgent to improve the wear resistance of tires to make them more suitable for new energy vehicles, especially large new energy vehicles. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a tire tread rubber suitable for large new energy vehicles with low rolling resistance and high wear resistance, as well as a preparation method and application thereof.

[0005] On the one hand, the present application provides a wear-resistant tire tread rubber composition, which includes: 60-80 parts of natural rubber, 20-30 parts of recycled rubber, 5-10 parts of zinc oxide, 5-10 parts of stearic acid, 5-10 parts of pine tar, 40-50 parts of white carbon black, 1-5 parts of accelerator, 1-5 parts of sulfur, 1-5 parts of carbonate, and 1-5 parts of surfactant.

[0006] Furthermore, the accelerator is selected from one or more of dibenzothiazyl disulfide (DM), N-cyclohexyl-2-benzothiazole sulfenamide (CBS), N-tert-butyl-2-benzothiazole sulfenamide (TBBS), and zinc diethyldithiocarbamate (ZDC).

[0007] Preferably, the accelerator is dibenzothiazyl disulfide (DM).

[0008] Furthermore, the surfactant is selected from one or more of GEMINI surfactant, fatty alcohol polyoxyethylene ether ammonium sulfate (AESA), and nonylphenol polyoxyethylene (10) ether (TX-10).

[0009] Preferably, the surfactant is a GEMINI surfactant.

[0010] Furthermore, the carbonate is selected from one or more of sodium carbonate, potassium carbonate, calcium carbonate and magnesium carbonate.

[0011] Preferably, the carbonate is sodium carbonate.

[0012] In a preferred embodiment, 60-80 parts of natural rubber, 20-30 parts of recycled rubber, 5-10 parts of zinc oxide, 5-10 parts of stearic acid, 5-10 parts of pine tar, 40-50 parts of white carbon black, 1-5 parts of dibenzothiazole disulfide, 1-5 parts of sulfur, 1-5 parts of sodium carbonate, and 1-5 parts of GEMINI surfactant.

[0013] The content of natural rubber may be any one of 60 parts, 65 parts, 70 parts, 75 parts and 80 parts.

[0014] The recycled rubber may be any value among 20 parts, 25 parts and 30 parts.

[0015] The content of zinc oxide can be any one of 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts.

[0016] The amount of stearic acid may be any one of 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts.

[0017] The amount of pine tar oil may be any one of 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, and 10 parts.

[0018] The amount of white carbon black can be any one of 40 parts, 45 parts and 50 parts.

[0019] The content of dibenzothiazyl disulfide can be any one of 1 part, 2 parts, 3 parts, 4 parts and 5 parts.

[0020] The amount of sulfur can be any one of 1 part, 2 parts, 3 parts, 4 parts and 5 parts.

[0021] The amount of sodium carbonate can be any one of 1 part, 2 parts, 3 parts, 4 parts and 5 parts.

[0022] The amount of GEMINI surfactant can be any value among 1 part, 2 parts, 3 parts, 4 parts and 5 parts.

[0023] Preferably, the tread rubber composition comprises: 80 parts of natural rubber, 26 parts of recycled rubber, 6 parts of zinc oxide, 5 parts of stearic acid, 6 parts of pine tar, 45 parts of white carbon black, 2 parts of dibenzothiazole disulfide, 4 parts of sulfur, 1 part of sodium carbonate, and 2 parts of GEMINI surfactant.

[0024] On the other hand, the present application also provides a method for preparing the wear-resistant tire tread rubber composition, the method comprising the following steps:

[0025] Step 1, mixing natural rubber and regenerated rubber at a temperature of 100° C. to 150° C. and a rotation speed of 10 to 80 rpm for 5 to 10 min, adding zinc oxide and stearic acid and continuing mixing for 5 to 10 min to obtain a mixed masterbatch;

[0026] Step 2, mixing white carbon black, pine tar, accelerator, carbonate, surfactant and mixed masterbatch evenly, and kneading to obtain a masterbatch;

[0027] Step 3, mixing the masterbatch described in step 2 with sulfur at 100° C.-150° C. and 10-80 rpm for 5-10 min, and removing the masterbatch to obtain a mixed rubber;

[0028] Step 4: vulcanize the mixed rubber at 100° C.-150° C. and 10-15 MPa for 10-60 min to obtain a tread rubber.

[0029] Furthermore, the step 2 also includes the step of subjecting the white carbon black, pine tar, accelerator, carbonate and surfactant to microwave treatment, wherein the microwave treatment conditions are 700-800 W, 300-400 MHz for 10-20 min.

[0030] Preferably, the microwave treatment condition is 750 W, 350 MHz for 15 min.

[0031] Furthermore, in the step 2, the mixing conditions are 100° C.-150° C. and 10-80 rpm for 5-10 min.

[0032] Preferably, the mixing conditions in step 2 are mixing at 130° C. and 40 rpm for 10 min.

[0033] In a preferred embodiment, the method for preparing the wear-resistant tire tread rubber composition comprises the following steps:

[0034] Step 1, mixing natural rubber and regenerated rubber at a temperature of 100° C. to 150° C. and a rotation speed of 10 to 80 rpm for 5 to 10 min, adding zinc oxide and stearic acid and continuing mixing for 5 to 10 min to obtain a mixed masterbatch;

[0035] Step 2, mix white carbon black, pine tar, accelerator DM, sodium carbonate and GEMINI surfactant evenly, treat with microwave at 700-800 W, 300-400 MHz for 10-20 min, mix with mixed masterbatch, mix at 100°C-150°C, 10-80rpm for 5-10 min, and obtain masterbatch;

[0036] Step 3, mixing the masterbatch described in step 1 with sulfur at 100° C.-150° C. and 10-80 rpm for 5-10 min, and draining to obtain a mixed rubber;

[0037] Step 4: vulcanize the mixed rubber at 100° C.-150° C. and 10-15 MPa for 10-60 min to obtain a tread rubber.

[0038] Preferably,

[0039] Step 1, mixing natural rubber and regenerated rubber at a temperature of 100° C. and a rotation speed of 60 rpm for 5 minutes, adding zinc oxide and stearic acid and continuing to mix for 5 minutes to obtain a mixed masterbatch;

[0040] Step 2, mix white carbon black, pine tar, accelerator DM, sodium carbonate and GEMINI surfactant evenly, microwave for 15 min at 750 W and 350 MHz, mix with the mixed masterbatch, and mix at 130 ° C and 40 rpm for 10 min to obtain a masterbatch;

[0041] Step 3, mixing the masterbatch described in step 1 with sulfur at 100° C. and 60 rpm for 10 min, and draining to obtain a mixed rubber;

[0042] Step 4: vulcanize the mixed rubber at 150° C. and 15 MPa for 50 min to obtain a tread rubber.

[0043] On the other hand, the present application also provides the use of the composition in preparing high wear-resistant tires.

[0044] On the other hand, the present application also provides a wear-resistant tire, characterized in that the tire comprises the tread rubber.

[0045] Those skilled in the art will appreciate that the tire can be prepared using a common method.

[0046] Furthermore, the tire is a large new energy vehicle tire, and the specification of the tire is 255 / 50 R19107W.

[0047] The tread rubber described in the present application can effectively solve the problem of severe tire wear of large-scale new energy vehicles, and provides a new tire and tread rubber material thereof for large-scale new energy vehicles.

[0048] The present invention has the following beneficial effects:

[0049] The present invention provides a tread rubber that combines wear resistance, low rolling resistance and high hardness, and provides a new tread rubber material for large new energy vehicles. In addition, the present invention uses GEMINI surfactant as a tread rubber surfactant for the first time, which solves the problem of low tensile strength in a high temperature environment, and further improves the anti-aging and high temperature resistance of the tread rubber.

[0050] The present invention also provides a method for preparing the tread rubber, wherein sodium carbonate is used for the first time in combination with microwave treatment to improve the dispersibility of components in the tread rubber and increase the qualified rate in the preparation process.

[0051] The present invention also provides a large-scale new energy vehicle tire containing the tread rubber, and the tire has better durability than commercially available tires. DETAILED DESCRIPTION

[0052] In order to more clearly illustrate the overall concept of the application, the following is described in detail by way of embodiment. In the following description, a large amount of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0053] If no specific conditions are specified in the examples, the experiments were carried out according to conventional conditions or conditions recommended by the manufacturer.

[0054] Among them, natural rubber and recycled rubber were purchased from Hainan Natural Rubber Industry Group Co., Ltd., GEMINI surfactant was purchased from Shenzhen Nengjie Chemical Technology Co., Ltd., the internal mixer was WQ-1010 purchased from Dongguan Weiqing Machinery Preparation Co., Ltd., the open mixer was SK-160B purchased from Shanghai No. 1 Rubber Machinery Factory, the flat plate vulcanizer was XQL13 purchased from Shanghai No. 1 Rubber Machinery Factory, the high and low temperature universal tensile testing machine was AI-7000-SGD purchased from Taiwan High Speed ​​Rail Testing Instrument Co., Ltd., the rubber hardness tester was HTS-800A purchased from Shanghai Yi-Zong Precision Instrument Co., Ltd., the Akron abrasion machine was CSI-A00 purchased from Shanghai Chengsi Intelligent Technology Co., Ltd., and the dynamic mechanical analyzer (BMM, MachOne) was purchased from Continental.

[0055] Unless otherwise specified, in the following embodiments, the reagents or instruments used without indicating the manufacturer are all conventional products that can be purchased commercially.

[0056] In a preferred embodiment, the method for preparing the tread rubber comprises the following steps:

[0057] Tread rubber ingredients: 60-80 parts of natural rubber, 20-30 parts of recycled rubber, 5-10 parts of zinc oxide, 5-10 parts of stearic acid, 5-10 parts of pine tar, 40-50 parts of white carbon black, 1-5 parts of accelerator DM, 1-5 parts of sulfur, 1-5 parts of sodium carbonate (Na2CO3), 1-5 parts of GEMINI surfactant.

[0058] (1) Weigh natural rubber and reclaimed rubber and mix them in an internal mixer at 100°C-150°C and 10-80 rpm for 5-10 min, then add zinc oxide and stearic acid and continue mixing for 5-10 min;

[0059] (2) Mix white carbon black, pine tar, accelerator DM, sodium carbonate and GEMINI surfactant evenly, place in a microwave device for microwave treatment, microwave power is 700-800 W, microwave frequency is 300-400 MHz, microwave time is 10-20 min, then add the microwave treated mixture in (1) and mix in an internal mixer at 100°C-150°C and 10-80 rpm for 5-10 min, and take out to obtain a masterbatch;

[0060] (3) The masterbatch described in (2) and sulfur are continuously mixed in an open mixer at 100° C.-150° C. and 10-80 rpm for 5-10 min, and the mixed rubber is discharged and allowed to stand for 12-24 h;

[0061] (4) The rubber mixture after standing is vulcanized at 100°C-150°C and 10-15 MPa for 10-60 min using a flat vulcanizer to obtain a tread rubber.

[0062] Example 1 Screening of components of tread rubber composition

[0063] In this embodiment, the formula of the tread rubber is screened in order to find a large-scale new energy vehicle tire material with both low rolling resistance and high wear resistance. Specifically, rubber, zinc oxide, stearic acid, pine tar, carbon black (or white carbon black), accelerator, sulfur and other ingredients are compounded, and the specific formula is shown in 1#-8# as follows:

[0064] 1#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g carbon black, 2 g accelerator DM, 4 g sulfur.

[0065] 2#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 40 g white carbon black, 2 g accelerator DM, 4 g sulfur.

[0066] 3#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, and 4 g sulfur.

[0067] 4#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 50 g white carbon black, 2 g accelerator DM, 4 g sulfur.

[0068] 5#: 106 g natural rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur.

[0069] 6#: 50 g natural rubber, 56 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur.

[0070] 7#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator CBS, 4 g sulfur.

[0071] 8#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 1 g accelerator DM, 4 g sulfur.

[0072] The tread rubber preparation method is as follows:

[0073] (1) Weigh the rubber and mix it in an internal mixer at 100°C and 60 rpm for 5 min, then add zinc oxide and stearic acid and continue mixing for 5 min; add carbon black (or white carbon black), pine tar and accelerator and continue mixing for 5 min, and take out the masterbatch;

[0074] (2) The masterbatch described in (1) and sulfur are continuously mixed in an open mixer at 100° C. and 60 rpm for 10 min, and the mixed rubber is discharged and allowed to stand for 24 h;

[0075] (3) The rubber mixture after standing was vulcanized at 150°C and 15 MPa for 50 min using a flat vulcanizer to obtain a tread rubber.

[0076] The hardness, wear resistance, elongation and rolling resistance of the tread rubbers 1#-8# obtained by the above method were tested. The specific test method is as follows, and the test results are shown in Table 1.

[0077] Hardness test: According to GB / T531.1-2008 standard, the tread rubber was tested for Shore hardness using a rubber hardness tester. A total of three measurements were performed and the final test results were averaged. The test results are shown in Table 2.

[0078] Wear resistance test: The wear resistance of the rubber was characterized using an Akron abrasion machine according to GB / T 1689-1998. A total of three measurements were performed for each sample, and the average value was taken as the final test result.

[0079] Rolling resistance test: Use a dynamic mechanical analyzer in tensile strain mode, with a strain frequency of 10 Hz and an amplitude of 0.3%. Use a heating rate of 3°C / min to perform a temperature sweep test in the range of -80°C to 80°C. For each sample, a total of 3 measurements were performed and the final test results were averaged.

[0080] Tensile test: Use a high and low temperature universal tensile testing machine to test the rubber composite material and observe its mechanical properties. According to GB / T528-2009, the prepared vulcanized rubber samples were cut and tested. The test conditions were: room temperature (25°C) or high temperature (50°C), the clamp distance was 75 mm, the mark distance was 25 mm, and the tensile speed was 500 mm / min. For each sample, a total of 3 measurements were performed, and the final test results were averaged.

[0081] Elongation = (stretched length - original length) / original length × 100%.

[0082] Table 1

[0083]

[0084] As shown in Table 1, this embodiment proves that within a certain range, as the mass of white carbon black increases, the hardness and wear resistance of the tread rubber increase accordingly. In addition, the best tread rubber formula obtained in this embodiment is 80 g of natural rubber, 26 g of recycled rubber, 6 g of zinc oxide, 5 g of stearic acid, 6 g of pine tar, 45 g of white carbon black, 2 g of accelerator DM, and 4 g of sulfur.

[0085] However, it is found in this embodiment that the preferred tread rubber can maintain good hardness, wear rate, rolling resistance and elongation at room temperature, but its elongation at high temperature needs to be improved.

[0086] Example 2 Screening of surfactants

[0087] In this embodiment, the preferred tread rubber components of Embodiment 1 are further optimized. Specifically, the tread rubber formula is as follows:

[0088] 9#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 1 part fatty alcohol polyoxyethylene ether ammonium sulfate (AESA).

[0089] 10#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 1 part nonylphenol polyoxyethylene (10) ether (TX-10).

[0090] 11#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 1 part GEMINI surfactant.

[0091] 12#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 2 parts GEMINI surfactant.

[0092] 13#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 5 parts GEMINI surfactant.

[0093] The tread rubber preparation method is as follows:

[0094] (1) Weigh natural rubber and reclaimed rubber and mix them in an internal mixer at 100°C and 60 rpm for 5 min, then add zinc oxide and stearic acid and continue mixing for 5 min; add white carbon black, pine tar, accelerator DM and surfactant and continue mixing for 5 min, and take out the masterbatch;

[0095] (2) The masterbatch described in (1) and sulfur are continuously mixed in an open mixer at 100° C. and 60 rpm for 10 min, and the mixed rubber is discharged and allowed to stand for 24 h;

[0096] (3) The rubber mixture after standing was vulcanized at 150°C and 15 MPa for 50 min using a flat vulcanizer to obtain a tread rubber.

[0097] The tread rubbers 3# and 9#-13# obtained by the above method were tested for hardness, wear resistance, elongation and rolling resistance. The specific testing methods were the same as those in Example 1. The test results are shown in Table 2.

[0098] Table 2

[0099]

[0100] In this embodiment, GEMINI surfactant is used as the tread rubber surfactant for the first time and compounded with the specific tread rubber combination of this application to solve the problem of low tensile strength in high temperature environment, so that the anti-aging and high temperature resistance of the tread rubber are further improved.

[0101] Example 3 Ingredient Improvement and Stability Test

[0102] In the actual application of this embodiment, it was found that after adding the GEMINI surfactant, some tread rubber composition systems had insufficient dispersibility, that is, small particles aggregated in the cross section of the tread rubber, resulting in uneven physical properties of the tread rubber finally produced. To solve this problem, further improvements were made in this embodiment with respect to its preparation method and composition ingredients.

[0103] 14#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 2 parts GEMINI surfactant, 1 part sodium carbonate.

[0104] The preparation method comprises:

[0105] Weigh the rubber and mix it in an internal mixer at 100°C and 60 rpm for 5 min, then add zinc oxide and stearic acid and continue mixing for 5 min; add white carbon black, pine tar, accelerator DM, GEMINI surfactant and carbonate and continue mixing for 5 min, then take out to obtain a masterbatch; (2) continue mixing the masterbatch described in (1) and sulfur in an open mixer at 100°C and 60 rpm for 10 min, remove the rubber and obtain a mixed rubber, and let it stand for 24 h;

[0106] (3) The rubber mixture after standing was vulcanized at 150°C and 15 MPa for 50 min using a flat vulcanizer to obtain a tread rubber.

[0107] 15#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 2 parts GEMINI surfactant, 1 part potassium carbonate. The preparation method is the same as 14#.

[0108] 16#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 2 parts GEMINI surfactant, 1 part calcium carbonate. The preparation method is the same as 14#.

[0109] 17#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 2 parts GEMINI surfactant, 1 part sodium carbonate.

[0110] The preparation method comprises:

[0111] (1) Weigh the rubber and mix it in an internal mixer at 100°C and 60 rpm for 5 min. Then add zinc oxide and stearic acid and continue mixing for 5 min.

[0112] (2) Mix white carbon black, pine tar, accelerator DM, sodium carbonate and GEMINI surfactant evenly, place in a microwave device for microwave treatment, microwave power is 750 W, microwave frequency is 350 MHz, microwave time is 15 min, then add the microwave treated mixture in (1) and mix in an internal mixer at 130 ° C and 40 rpm for 10 min, and take out to obtain a masterbatch;

[0113] (3) The masterbatch described in (2) and sulfur are continuously mixed in an open mixer at 100° C. and 60 rpm for 10 min, and the mixed rubber is discharged and allowed to stand for 24 h;

[0114] (4) The rubber mixture after standing was vulcanized at 150°C and 15 MPa for 50 min using a flat vulcanizer to obtain a tread rubber.

[0115] 18#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 2 parts GEMINI surfactant, 1 part potassium carbonate. The preparation method is the same as 17#.

[0116] 19#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 2 parts GEMINI surfactant, 1 part sodium carbonate.

[0117] The preparation method comprises:

[0118] (1) Weigh the rubber and mix it in an internal mixer at 100°C and 60 rpm for 5 min. Then add zinc oxide and stearic acid and continue mixing for 5 min.

[0119] (2) Mix white carbon black, pine tar, accelerator DM, sodium carbonate and GEMINI surfactant evenly, place in a microwave device for microwave treatment, microwave power is 700 W, microwave frequency is 350 MHz, microwave time is 15 min, then add the microwave treated mixture in (1) and mix in an internal mixer at 130 ° C and 40 rpm for 10 min, and take out to obtain a masterbatch;

[0120] (3) The masterbatch described in (2) and sulfur are continuously mixed in an open mixer at 100° C. and 60 rpm for 10 min, and the mixed rubber is discharged and allowed to stand for 24 h;

[0121] (4) The rubber mixture after standing was vulcanized at 150°C and 15 MPa for 50 min using a flat vulcanizer to obtain a tread rubber.

[0122] 20#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 2 parts GEMINI surfactant, 1 part sodium carbonate.

[0123] The preparation method comprises:

[0124] (1) Weigh the rubber and mix it in an internal mixer at 100°C and 60 rpm for 5 min. Then add zinc oxide and stearic acid and continue mixing for 5 min.

[0125] (2) Mix white carbon black, pine tar, accelerator DM, sodium carbonate and GEMINI surfactant evenly, place in a microwave device for microwave treatment, microwave power is 750 W, microwave frequency is 300 MHz, microwave time is 15 min, then add the microwave treated mixture in (1) and mix in an internal mixer at 130 ° C and 40 rpm for 10 min, and take out to obtain a masterbatch;

[0126] (3) The masterbatch described in (2) and sulfur are continuously mixed in an open mixer at 100° C. and 60 rpm for 10 min, and the mixed rubber is discharged and allowed to stand for 24 h;

[0127] (4) The rubber mixture after standing was vulcanized at 150°C and 15 MPa for 50 min using a flat vulcanizer to obtain a tread rubber.

[0128] 21#: 80 g natural rubber, 26 g recycled rubber, 6 g zinc oxide, 5 g stearic acid, 6 g pine tar, 45 g white carbon black, 2 g accelerator DM, 4 g sulfur, 2 parts GEMINI surfactant, 1 part sodium carbonate.

[0129] The preparation method comprises:

[0130] (1) Weigh the rubber and mix it in an internal mixer at 100°C and 60 rpm for 5 min. Then add zinc oxide and stearic acid and continue mixing for 5 min.

[0131] (2) Mix white carbon black, pine tar, accelerator DM, sodium carbonate and GEMINI surfactant evenly, place in a microwave device for microwave treatment, microwave power is 750 W, microwave frequency is 350 MHz, microwave time is 10 min, then add the microwave treated mixture in (1) and mix in an internal mixer at 130 ° C and 40 rpm for 10 min, and take out to obtain a masterbatch;

[0132] (3) The masterbatch described in (2) and sulfur are continuously mixed in an open mixer at 100° C. and 60 rpm for 10 min, and the mixed rubber is discharged and allowed to stand for 24 h;

[0133] (4) The rubber mixture after standing was vulcanized at 150°C and 15 MPa for 50 min using a flat vulcanizer to obtain a tread rubber.

[0134] The dispersion test method is to observe whether there are irregular particles in the tread rubber cross section, that is, to record the qualified rate of the tread rubber. The qualified rate counting method is to record the number of 100 tread rubber cross sections without irregular particles (that is, the cross section is flat). The results are shown in Table 3.

[0135] Qualified rate = number of tread rubbers without irregular particles / total number of tread rubbers * 100%

[0136] Table 3

[0137]

[0138] As shown in the results in Table 3, sodium carbonate and potassium carbonate as additives can improve the dispersibility of the components in the tread rubber to a certain extent and thus improve the qualified rate of the tread rubber, especially sodium carbonate combined with microwave treatment can make the qualified rate of the tread rubber reach 98%. And the mechanical properties (hardness), wear resistance, high and low temperature tensile properties and rolling resistance properties of the tread rubber 17# in this embodiment and 12# in Example 2 are compared, and the performance of the two is consistent, with no significant difference.

[0139] Example 4

[0140] This embodiment provides a formula of tread rubber and a preparation method thereof.

[0141] Tread rubber formula: 88 parts of natural rubber, 24 parts of recycled rubber, 5 parts of zinc oxide, 3.5 parts of stearic acid, 3 parts of pine tar, 43 parts of white carbon black, 0.8 parts of accelerator DM, 3 parts of sulfur, 1 part of sodium carbonate, and 2 parts of GEMINI surfactant.

[0142] The preparation method of the tread rubber comprises the following steps:

[0143] (1) Weigh natural rubber and reclaimed rubber and mix them in an internal mixer at 100°C and 60 rpm for 5 min, then add zinc oxide and stearic acid and continue mixing for 5 min;

[0144] (2) Mix white carbon black, pine tar, accelerator DM, sodium carbonate and GEMINI surfactant evenly, place in a microwave device for microwave treatment, microwave power is 750 W, microwave frequency is 350 MHz, microwave time is 15 min, then add the microwave treated mixture in (1) and mix in an internal mixer at 130 ° C and 40 rpm for 10 min, and take out to obtain a masterbatch;

[0145] (3) The masterbatch described in (2) and sulfur are continuously mixed in an open mixer at 100° C. and 60 rpm for 10 min, and the mixed rubber is discharged and allowed to stand for 24 h;

[0146] (4) The rubber mixture after standing was vulcanized at 150°C and 15 MPa for 50 min using a flat vulcanizer to obtain a tread rubber.

[0147] Example 5

[0148] The only difference between this embodiment and embodiment 4 is that the mixing conditions in step (2) are mixing in an internal mixer at 100° C. and 40 rpm for 10 min.

[0149] Example 6

[0150] The only difference between this embodiment and embodiment 4 is that the mixing conditions in (2) are mixing in an internal mixer at 130° C. and 40 rpm for 5 min.

[0151] Example 7

[0152] The only difference between this embodiment and embodiment 4 is that the mixing condition in step (2) is mixing in an internal mixer at 130° C. and 60 rpm for 10 min.

[0153] Example 8

[0154] The difference between this embodiment and embodiment 4 is that the vulcanization conditions are 100° C., 15 MPa and 50 min.

[0155] Example 9

[0156] The difference between this embodiment and embodiment 4 is that the vulcanization conditions are 150° C. and 10 MPa for 50 min.

[0157] Example 10

[0158] The difference between this embodiment and embodiment 4 is that the vulcanization conditions are 150° C., 15 MPa and 10 min.

[0159] Test example: Tire performance test

[0160] In order to simulate the actual use scenario requirements of large new energy vehicles as much as possible, in this embodiment, the tread rubber of the above embodiments 4-10 is installed on the tire, the tire specification is 255 / 50 R19 107W, and the commercially available tires of the same specification are used as the control group for tire performance testing. The tires are subjected to conventional durability tests according to GB / T4501-2023, and the cumulative mileage when the tread bursts is counted. The experimental results are shown in Table 4.

[0161] Table 4

[0162]

[0163] It can be seen from the results in Table 4 that in actual application, the tire made of the tread rubber prepared by the method of Example 4 has better performance.

[0164] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A wear-resistant tire tread rubber composition, characterized in that: The composition comprises: 80 parts of natural rubber, 26 parts of reclaimed rubber, 6 parts of zinc oxide, 5 parts of stearic acid, 6 parts of pine tar, 45 parts of white carbon black, 2 parts of dibenzothiazole disulfide, 4 parts of sulfur, 1 part of sodium carbonate, and 2 parts of GEMINI surfactant; The preparation method of the wear-resistant tire tread rubber composition comprises the following steps: Step 1, mixing natural rubber and regenerated rubber at a temperature of 100° C. and a rotation speed of 60 rpm for 5 minutes, adding zinc oxide and stearic acid and continuing to mix for 5 minutes to obtain a mixed masterbatch; Step 2, mix white carbon black, pine tar, accelerator DM, sodium carbonate and GEMINI surfactant evenly, microwave for 15 min at 750 W and 350 MHz, mix with the mixed masterbatch, and mix for 10 min at 130 ° C and 40 rpm to obtain a masterbatch; Step 3, mixing the masterbatch described in step 1 with sulfur at 100° C. and 60 rpm for 10 min, and draining to obtain a mixed rubber; Step 4: vulcanize the mixed rubber at 150° C. and 15 MPa for 50 min to obtain a tread rubber.

2. Use of the composition as claimed in claim 1 in preparing high wear-resistant tires.

3. A wear-resistant tire, characterized in that: The tire comprises the tread rubber composition according to claim 1.

4. The tire according to claim 3, characterized in that The tire is a large new energy vehicle tire.

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