Rosin resin, tread rubber composition containing rosin resin, and production method and use thereof

Abstract

The present application relates to the technical field of rosin resin, and particularly relates to a rosin resin, a tread rubber composition containing the rosin resin, and a preparation method and application thereof. The rosin resin is obtained by esterification of rosin and polyhydric alcohol under the action of a catalyst, and the proportion of isopimaric acid in the rosin is not more than 5%. The rosin resin of the present application is applied to tires, and meanwhile, the wet grip, the rolling resistance and the wear resistance are simultaneously improved, and the effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rosin resin, in particular to a rosin resin, a tread rubber composition containing the rosin resin, and a preparation method and application thereof. BACKGROUND

[0002] With the rapid development of the automobile industry, especially the development of electric vehicles, the performance of tires becomes increasingly important to the safety of vehicles and the economy of energy. Among them, wet grip, rolling resistance and wear resistance are the three core indicators to measure the performance of tires, which are mutually restrictive.

[0003] Wet grip refers to the gripping ability of tires on wet roads, which directly affects the braking performance and handling stability of vehicles; rolling resistance is closely related to the energy consumption of vehicles; wear resistance determines the service life of tires and the emission of particulate matter.

[0004] At present, anti-wet skid resin is widely used in tires to improve wet grip, but it has some negative effects on rolling resistance and wear resistance, and it is difficult to improve and balance the three performances at the same time. Different resins used to improve the performance of tires in the prior art often have the problem that only one performance can be improved, and the other two performances cannot be improved and balanced.

[0005] For example, Japanese Patent Publication No. 2012-512290 discloses a rubber composition, which improves the wet grip performance and rolling resistance by adding an alpha-methylstyrene polymer resin as a plasticizer, but does not consider its wear resistance, which still needs to be further improved.

[0006] The prior art (Feng Kun-hao, Long Yan-ni, Chen Zhaohui, et al. Effect of modified rosin resin dosage on the performance of solution polymerized styrene-butadiene rubber / butadiene rubber blend [J]. Synthetic Rubber Industry, 2019, 42(3): 5.) discloses that the application of modified rosin resin in solution polymerized styrene-butadiene rubber (SSBR) / butadiene rubber (BR) blend can improve the wet skid resistance of SSBR / BR compound while basically not affecting its rolling resistance. However, the rosin resin used therein needs to be modified, and the rolling resistance is not improved, and the wear resistance needs to be further improved.

[0007] Therefore, there is an urgent need to provide a rosin resin that can effectively improve the wet grip of tires, while reducing the rolling resistance and enhancing the wear resistance.

[0008] Compared with traditional petroleum resin, rosin resin has important influence as a renewable resource. Therefore, it is necessary to develop a rosin resin, a tread rubber composition containing the rosin resin, and a preparation method and application thereof, which can solve the above technical problems. SUMMARY

[0009] The present application aims to overcome the deficiencies of the prior art and provide a rosin resin, a tread rubber composition containing the rosin resin, and a preparation method and application thereof, which can significantly improve the wet grip, rolling resistance and wear resistance of tires.

[0010] The present application is implemented by the following technical solutions:

[0011] The present application provides a preparation method of rosin resin, which is obtained by esterification of rosin and polyol under the action of a catalyst, and the content of isopimaric acid in the rosin is not more than 5%.

[0012] The rosin according to the present application can be at least one of Masson's pine rosin, wet pine rosin, Simao pine rosin, southern yellow pine rosin, and Caribbean pine rosin.

[0013] The rosin used in the present application meets the requirements of GB / T 8145-2021 Fat Rosin, and the components in the rosin are measured according to GB / T 14020-2024 Hydrogenated Rosin.

[0014] As an embodiment of the present application, the polyol includes at least one of dihydric alcohol, trihydric alcohol and tetrahydric alcohol.

[0015] Preferably, the dihydric alcohol includes at least one of ethylene glycol and diethylene glycol, the trihydric alcohol includes at least one of glycerol and trihydroxypropane, and the tetrahydric alcohol includes pentaerythritol.

[0016] As an embodiment of the present application, the catalyst includes at least one of sulfur, sulfide, phosphoric acid, phosphorous acid, hypophosphorous acid, nano cerium oxide, nano titanium dioxide, nano lanthanum oxide, neodymium oxide, magnesium oxide, zinc oxide, lithium carbonate, calcium hydroxide and p-toluenesulfonic acid.

[0017] As an embodiment of the present application, the esterification reaction is carried out at a temperature of 220-300℃ for 3-20h. Within this range, as long as the acid value of the prepared rosin resin is below 50mg / g, the hydroxyl value is below 60mg / g, and the sum of the acid value and the hydroxyl value is below 60mg / g, the esterification reaction can be carried out.

[0018] Further preferably, the preparation method includes: crushing the rosin and adding it to a reaction kettle, melting at 180℃ under nitrogen protection, turning off the nitrogen, adding the polyol and the catalyst, and carrying out the esterification reaction by heating, the esterification reaction temperature is 220-300℃, the esterification reaction time is 3-20h, and the acid value, the hydroxyl value and the softening point are monitored in real time.

[0019] Index testing:

[0020] Acid value: measured according to GB / T 8146-2022 "Rosin test methods";

[0021] Hydroxyl value: measured according to the acetic anhydride method in GB / T 7383-2020 "Nonionic surfactants - Determination of hydroxyl value";

[0022] Softening point: measured according to GB / T 8146-2022 "Rosin test methods".

[0023] As an embodiment of the present application, the raw material for preparing the rosin resin comprises, by weight fraction:

[0024] Rosin 100 parts by weight

[0025] Polyol 5-22 parts by weight

[0026] Catalyst 0.1-1 parts by weight.

[0027] The second aspect of the present application provides a rosin resin prepared by the above preparation method.

[0028] As an embodiment of the present application, the acid value of the rosin resin is 50 mg / g or less, preferably not more than 30 mg / g, more preferably not more than 15 mg / g.

[0029] The acid value of the rosin resin in the present application is determined by referring to GB / T 8146-2022 "Rosin test methods".

[0030] As an embodiment of the present application, the hydroxyl value of the rosin resin is 60 mg / g or less, preferably not more than 35 mg / g, more preferably not more than 30 mg / g, and particularly preferably not more than 20 mg / g.

[0031] The hydroxyl value of the rosin resin in the present application is determined by referring to the acetic anhydride method in GB / T 7383-2020 "Nonionic surfactants - Determination of hydroxyl value", and the hydroxyl value means the milligrams of potassium hydroxide required to neutralize the acid generated by esterifying 1 g of sample with acetic anhydride or the milligrams of potassium hydroxide equivalent to the hydroxyl groups in 1 g of sample.

[0032] As an embodiment of the present application, the sum of the acid value and the hydroxyl value of the rosin resin is 60 mg / g or less, preferably not more than 30 mg / g, and more preferably not more than 20 mg / g.

[0033] As an embodiment of the present application, the softening point of the rosin resin is greater than 65°C.

[0034] The third aspect of the present application provides a tread rubber composition containing a rosin resin, which comprises the following components, by weight fraction:

[0035] Rubber 100 parts

[0036] Rosin resin 1-60 parts

[0037] Filler 60-140 parts.

[0038] As an embodiment of the present application, the rubber includes at least one of natural rubber NR, styrene butadiene rubber SBR, and butadiene rubber BR. The styrene butadiene rubber SBR is not particularly limited, and can include solution polymerized SBR (S-SBR), unmodified emulsion polymerized SBR (E-SBR), and modified SBR thereof, etc. Preferably, the styrene butadiene rubber includes at least one of solution polymerized styrene butadiene rubber SSBR and emulsion polymerized styrene butadiene rubber ESBR. The butadiene rubber BR is cis-BR, and includes various BRs such as modified BR and high cis-BR, or a combination thereof.

[0039] Preferably, the rubber includes styrene butadiene rubber SBR and butadiene rubber BR, and the mass percentage of the styrene butadiene rubber in the rubber is 80%.

[0040] As an embodiment of the present application, the filler includes at least one of silica and carbon black.

[0041] The silica refers to silica or other silicic acid derivatives, including precipitated silica, aluminum silicate or calcium silicate, fumed silica, etc., and bio-based white carbon black such as rice husk white carbon black.

[0042] The carbon black includes furnace black, acetylene black, thermal cracking carbon black, channel black, graphite, etc., including N110 / N220 / N234 / N330 / N345 / N472 / N550 / N660 / N650 / N770 / N772 / N774 / N880 / N990, etc., and the carbon black can be used alone or in combination.

[0043] Preferably, the amount of the silica is 60-140 parts, and further preferably 80-120 parts.

[0044] As an embodiment of the present application, the amount of the rosin resin in the tread rubber composition is 1-10 parts, or 10-20 parts, or 20-30 parts, or 30-40 parts, or 40-50 parts, or 50-60 parts.

[0045] As an embodiment of the present application, the tread rubber composition further includes other commonly used compounding agents in rubber, such as plasticizers, coupling agents, vulcanizing agents, accelerators, and anti-aging agents, etc.

[0046] Plasticizer, also known as processing oil or operating oil, includes petroleum derived processing oil (aromatic oil, paraffin oil, naphthenic oil, etc.), vegetable oil (rapeseed oil, soybean oil, etc.) and paraffin, preferably 0-30 parts by mass, further preferably 10-20 parts.

[0047] Coupling agent, preferably sulfide silane coupling agent, mercapto silane coupling agent, such as Si-69 and Si-75, etc., preferably 5-10 parts.

[0048] Vulcanizing agent, preferably using sulfur, mainly including vulcanizing powder, insoluble sulfur, colloidal sulfur, etc., preferably 1-3 parts.

[0049] Accelerator, including thiazole vulcanization accelerator such as accelerator M, DM, MZ and MTT, etc., sulfenamide vulcanization accelerator such as CZ, NS, DZ and NOBS, etc., thiuram vulcanization accelerator such as TMTD, TMTM, TETD, TBzTD, DPTT, TIBTD and DDTS, etc., dithiocarbamate vulcanization accelerator such as EZ, BZ, PZ, ZBEC, TDEC, etc., guanidine vulcanization accelerator such as DPG, DOTG, etc., thiourea vulcanization accelerator such as ETU, DETU, DPTU, etc. Usually with active agents such as zinc oxide and stearic acid, etc., used to improve the vulcanization efficiency.

[0050] Preferably, the accelerator includes sulfenamide vulcanization accelerator, thiazole vulcanization accelerator and guanidine vulcanization accelerator, which can be used alone or in combination. Preferably 2-5 parts.

[0051] Antioxidant, including amine antioxidant, phenolic antioxidant, heterocyclic antioxidant, phosphite antioxidant and other antioxidants, such as TMQ, 6PPD and IPPD, which can be used alone or in combination. Preferably 2-4 parts.

[0052] As an embodiment of the present application, the tread rubber composition, by weight parts, includes the following components:

[0053] Styrene butadiene rubber 80 parts

[0054] Butadiene rubber 20 parts

[0055] Silicon dioxide 90 parts

[0056] Carbon black 6 parts

[0057] Naphthene aromatic oil 15 parts

[0058] Rosin resin 20 parts

[0059] Silane coupling agent 7.2 parts

[0060] Zinc oxide 3.5 parts

[0061] accelerator CBS 1.8 parts

[0062] accelerator DPG 2 parts

[0063] antioxidant 6PPD 3 parts

[0064] wax 2 parts

[0065] stearic acid 2.5 parts

[0066] sulfur 2 parts.

[0067] The fourth aspect of the present application provides a method for preparing the above-mentioned tread rubber composition, comprising the following steps: mixing the raw materials in a proportion in a mixer, and obtaining the product.

[0068] As an embodiment of the present application, the mixing is carried out in stages, and the first-stage mixing is carried out at 145℃ for 300s at a rotation speed of 65rpm, and the second-stage mixing is carried out at 155℃ for 180s at a rotation speed of 45rpm.

[0069] As an embodiment of the present application, the Mooney viscosity of the tread rubber composition is 55±10MPa·s under the condition of ML 1+4, 125℃. "ML 1+4, 125℃" means the torque value measured by a large rotor under the condition of preheating for 1min at 125℃ and rotating for 4min.

[0070] The fifth aspect of the present application provides the use of the above-mentioned rosin resin or the above-mentioned tread rubber composition or the tread rubber composition prepared by the above-mentioned method in the preparation of tires.

[0071] The beneficial effects of the present application are:

[0072] The present application adds rosin resin containing a specific content of isopimaric acid into the tread rubber composition, and adjusts the preparation process of the rosin resin to make the softening point of the rosin resin in a specific range, which can significantly improve the wet grip, effectively reduce the rolling resistance, and enhance the wear resistance. By improving the wet grip of the tire, the braking distance is reduced, and the safety of the vehicle on the wet road surface is improved. By reducing the rolling resistance of the tire, the energy efficiency of the vehicle is improved, and the carbon dioxide emission is reduced.

[0073] The rosin resin of the present application is derived from natural plants, and has renewability and environmental friendliness.

[0074] The present application can further improve the wet grip, reduce the rolling resistance, and enhance the wear resistance by adjusting the acid value, the hydroxyl value, and the sum of the two of the rosin resin in a specific range.

[0075] The tread rubber composition of the present application can significantly improve wet grip, effectively reduce rolling resistance, and enhance wear resistance compared with commercially available tread modified resins. DETAILED DESCRIPTION

[0076] The advantages and features of the present application will become more apparent with the description of the specific embodiments. However, these embodiments are only exemplary and do not constitute any limitation on the scope of the present application. Those skilled in the art should understand that the details and forms of the technical solutions of the present application can be modified or replaced without departing from the spirit and scope of the present application, and such modifications and replacements fall within the protection scope of the present application.

[0077] The rosin used in the following examples meets the requirements of GB / T 8145-2021 Rosin.

[0078] The content of isodehydroabietic acid in each rosin component is as follows, measured according to GB / T 14020-2024 Hydrogenated Rosin.

[0079] Masson's pine rosin 1.1%;

[0080] Wet pine rosin 13.9%;

[0081] Caribbean pine rosin 10.1%;

[0082] Xishuangbanna pine rosin 4%;

[0083] South Asian pine rosin 14.3%.

[0084] Example 1

[0085] A rosin resin, the components are as follows according to weight fraction:

[0086] Masson's pine rosin 100 parts

[0087] Pentaerythritol 12 parts

[0088] Nano zinc oxide 0.8 parts

[0089] The preparation method of the rosin resin is as follows: the Masson's pine rosin is crushed and added to a reaction kettle, heated to 180℃ under nitrogen protection to melt, the nitrogen is turned off, pentaerythritol and nano zinc oxide catalyst are added, and the esterification reaction is carried out by heating, the esterification reaction temperature is 280℃, the esterification reaction time is 11h, and the real-time monitoring indexes are acid value, hydroxyl value and softening point, and the product indexes are shown in Table 1.

[0090] Example 2

[0091] A rosin resin, the components are as follows according to weight fraction:

[0092] Masson's pine rosin 100 parts

[0093] Glycerol 12 parts

[0094] p-toluenesulfonic acid 0.8 parts

[0095] The preparation method of the rosin resin is as follows: the slash pine rosin is crushed and added into a reaction kettle, and is melted by heating to 180℃ under nitrogen protection. The nitrogen is closed, and glycerol and p-toluenesulfonic acid catalyst are added. Esterification is carried out by heating, the esterification temperature is 275℃, the esterification time is 8h, and the indicators of acid value, hydroxyl value and softening point are monitored in real time. The product indicators are shown in Table 1.

[0096] Example 3

[0097] A rosin resin, the components are as follows according to weight parts:

[0098] Wet pine rosin 30 parts

[0099] Slash pine rosin 70 parts

[0100] Pentaerythritol 12 parts

[0101] Hypophosphorous acid 0.8 parts

[0102] The preparation method of the rosin resin is as follows: the wet pine rosin and the slash pine rosin are crushed and added into a reaction kettle, and are melted by heating to 180℃ under nitrogen protection. The nitrogen is closed, and pentaerythritol and hypophosphorous acid catalyst are added. Esterification is carried out by heating, the esterification temperature is 280℃, the esterification time is 11h, and the indicators of acid value, hydroxyl value and softening point are monitored in real time. The product indicators are shown in Table 1.

[0103] Example 4

[0104] A rosin resin, the components are as follows according to weight parts:

[0105] Simao pine rosin 90 parts

[0106] Wet pine rosin 10 parts

[0107] Glycerol 7.5 parts

[0108] Ethylene glycol 5 parts

[0109] Lithium carbonate 0.8 parts

[0110] The preparation method of the rosin resin is as follows: the Simao pine rosin and the wet pine rosin are crushed and added into a reaction kettle, and are melted by heating to 180℃ under nitrogen protection. The nitrogen is closed, and glycerol, ethylene glycol and lithium carbonate catalyst are added. Esterification is carried out by heating, the esterification temperature is 276℃, the esterification time is 15h, and the indicators of acid value, hydroxyl value and softening point are monitored in real time. The product indicators are shown in Table 1.

[0111] Example 5

[0112] A rosin resin, the components are as follows according to weight fraction:

[0113] Masson's pine rosin 85 parts

[0114] Wet pine rosin 15 parts

[0115] Sulfur 0.8 parts

[0116] The preparation method of the rosin resin is as follows: the Masson's pine rosin and the wet pine rosin are crushed and added to a reaction kettle, and then heated to 180℃ under nitrogen protection to melt, the nitrogen is closed, glycerol and sulfur catalyst are added, and esterification reaction is carried out by heating, the esterification reaction temperature is 275℃, the esterification reaction time is 8h, the indicators of real-time monitoring are acid value, hydroxyl value and softening point, and the product indicators are shown in Table 1.

[0117] Example 6

[0118] A rosin resin, the components are as follows according to weight fraction:

[0119] Masson's pine rosin 100 parts

[0120] Pentaerythritol 2 parts

[0121] Ethylene glycol 10 parts

[0122] Nano zinc oxide 0.8 parts

[0123] The preparation method of the rosin resin is as follows: the Masson's pine rosin is crushed and added to a reaction kettle, and then heated to 180℃ under nitrogen protection to melt, the nitrogen is closed, pentaerythritol, ethylene glycol and nano zinc oxide catalyst are added, and esterification reaction is carried out by heating, the esterification reaction temperature is 278℃, the esterification reaction time is 15h, the indicators of real-time monitoring are acid value, hydroxyl value and softening point, and the product indicators are shown in Table 1.

[0124] Example 7

[0125] A rosin resin, the components are as follows according to weight fraction:

[0126] Simao pine rosin 100 parts

[0127] Pentaerythritol 13 parts

[0128] Nano zinc oxide 0.8 parts

[0129] The preparation method of the rosin resin is as follows: the Simao pine rosin is crushed and added to a reaction kettle, and then heated to 180℃ under nitrogen protection to melt, the nitrogen is closed, pentaerythritol and nano zinc oxide catalyst are added, and esterification reaction is carried out by heating, the esterification reaction temperature is 280℃, the esterification reaction time is 11h, the indicators of real-time monitoring are acid value, hydroxyl value and softening point, and the product indicators are shown in Table 1.

[0130] Example 8

[0131] A rosin resin, the components are as follows according to parts by weight:

[0132] Saimao rosin 92 parts

[0133] Caribbean rosin 8 parts

[0134] Trimethylolpropane 15.5 parts

[0135] Nano zinc oxide 0.8 parts

[0136] The preparation method of the rosin resin is as follows: the saimao rosin and the caribbean rosin are crushed and added to a reaction kettle, heated to 180℃ under nitrogen protection, the nitrogen is turned off, trimethylolpropane and nano zinc oxide catalyst are added, and the esterification reaction is carried out by heating, the esterification reaction temperature is 275℃, the esterification reaction time is 8h, and the real-time monitoring indexes are acid value, hydroxyl value and softening point, and the product indexes are shown in Table 1.

[0137] Table 1 product indexes of each example

[0138]

[0139] Comparative example 1-comparative example 7

[0140] Comparative example 1-comparative example 4 and example 1 are different in rosin type and its ratio, the type and amount of polyol, the temperature and time of esterification reaction. Among them, when pentaerythritol is used as polyol, the esterification reaction temperature is 280℃, the esterification reaction time is 11h; when glycerol or trimethylolpropane is used as polyol, the esterification reaction temperature is 275℃, the esterification reaction time is 8h; when ethylene glycol is used as polyol, the esterification reaction temperature is 275℃, the esterification reaction time is 15h; comparative example 2 contains pentaerythritol and ethylene glycol, the esterification reaction temperature is 278℃, and the esterification reaction time is 13h. The type and amount of polyol of each comparative example are shown in Table 2, and the product indexes are shown in Table 3.

[0141] Among them, the difference between comparative example 1 and example 1 is mainly that the softening point is not within the protection range, the difference between comparative example 2 and example 2 is mainly that the sum of acid value and hydroxyl value is not within the protection range, the difference between comparative example 3 and example 4 is mainly that the acid value is not within the protection range, the difference between comparative example 4 and example 3 is mainly that the acid value and the sum of acid value and hydroxyl value are not within the protection range, the difference between comparative example 5 and example 3 is mainly that the ratio of masson pine rosin and slash pine rosin is changed to equal weight ratio, the content of isopimaric acid is not within the protection range, comparative example 6 replaces the rosin resin with α-methyl styrene resin purchased from the market, and the difference between comparative example 7 and example 1 is that the type of rosin is different, which is changed to south Asian pine rosin, and the rest of the conditions are the same.

[0142] Table 2 Formulation of each comparative example

[0143]

[0144] Table 3 Product index of each comparative example

[0145]

[0146] Application Example 1

[0147] A tread rubber composition, comprising the following components in parts by weight:

[0148] Styrene-butadiene rubber 80 parts

[0149] Butadiene rubber 20 parts

[0150] Silicon dioxide 90 parts

[0151] Carbon black 6 parts

[0152] Naphthenic aromatic oil 15 parts

[0153] Rosin resin 20 parts

[0154] Silane coupling agent Si-69 7.2 parts

[0155] Zinc oxide 3.5 parts

[0156] Accelerator CBS 1.8 parts

[0157] Accelerator DPG 2 parts

[0158] Antioxidant 6PPD 3 parts

[0159] Wax 2 parts

[0160] Stearic acid 2.5 parts

[0161] Sulfur 2 parts.

[0162] Main material description: (1) Styrene-butadiene rubber (SBR) brand SL 4602, from TRINSEO; (2) Butadiene rubber (BR) brand CB25, from LANXESS; (3) White carbon black (silicon dioxide) brand HD 165MP, from QUECHEM; (4) Carbon black brand N330, from BlackCat; (5) Naphthenic aromatic oil brand Norman346, from Orgkhim; (6) Rosin resin is the rosin resin prepared in each example or comparative example; the rest of the additives are conventional commercially available products.

[0163] Preparation of the tread rubber composition: the raw materials were proportioned and mixed in a mixer in stages, first stage mixing: 145°C x 300s, rotation speed 65 rpm; second stage mixing: 155°C x 180s, rotation speed 45 rpm, the Mooney viscosity of the tread rubber composition was controlled to be 55±10 MPa·s under the condition of ML(1+4), 125°C, and the tread rubber composition was obtained.

[0164] Performance testing and evaluation of the tread rubber composition of Test Example 1

[0165] Tan δ value testing: the dynamic mechanical property testing was performed by DMA, using a tensile mode from -60°C to +100°C, a temperature rising rate of 5 K / min, 10 Hz, and a dynamic strain of 0.25%.

[0166] Wet grip: indicated by the tan δ value at 0°C, the greater the tan δ value, the better the wet grip.

[0167] Rolling resistance: indicated by the tan δ value at 60°C, the smaller the tan δ value, the smaller the rolling resistance.

[0168] Wear resistance: determined according to GB / T 9867-2008 “Determination of the wear resistance of vulcanized or thermoplastic rubber (rotating roller abrasion machine method)”, indicated by the relative volume loss amount mm 3 of the tire under specific conditions, the smaller the relative volume loss amount, the better the wear resistance.

[0169] Performance determination and evaluation of the tread rubber composition are shown in Table 4.

[0170] Table 4: Test indexes of the tread rubber composition

[0171]

[0172] From the data in Table 4, it can be seen that the rosin resins of Examples 1 to 8 all meet the preparation characteristics of the rosin resins described in the present application, in contrast, the rosin resins of Comparative Examples 1 to 5 do not meet or only partially meet the characteristics of the present application in some aspects, especially worth mentioning is that the α-methyl styrene resin used in Comparative Example 6 is the best tread modifying resin in performance on the market. The test results show that Examples 1 to 8 are superior to Comparative Example 6 in wet grip, rolling resistance and wear resistance, on the other hand, further analysis of Comparative Examples 1 to 5 and Comparative Example 6 shows that the performance difference between them is not significant, which shows that the resins prepared by the present application have significant advantages in wet grip, rolling resistance and wear resistance at the same time.

[0173] The above detailed description is a specific description of one of the possible embodiments of the present application, which is not used to limit the patent scope of the present application, and any equivalent implementation or change made without departing from the present application shall be included in the scope of the technical solutions of the present application.

Claims

1. A tread rubber composition containing rosin resin, characterized in that, Based on parts by weight, it includes the following components: 100 parts of rubber 1-60 parts of rosin resin 60-140 parts of filler; The rubber includes styrene-butadiene rubber and butadiene rubber; The rosin resin is obtained by esterification reaction of rosin and polyol under the action of a catalyst. The proportion of isopyric acid in the rosin is not greater than 5%. The acid value of the rosin resin is less than 50 mg / g. The sum of the acid value and hydroxyl value of the rosin resin is less than 60 mg / g. The softening point of the rosin resin is greater than 65°C.

2. The tread rubber composition according to claim 1, characterized in that, The polyol includes at least one of diols, triols, and tetraols.

3. The tread rubber composition according to claim 2, characterized in that, The diol includes at least one of ethylene glycol and diethylene glycol, the triol includes at least one of glycerol and trihydroxypropane, and the tetraol includes pentaerythritol.

4. The tread rubber composition according to claim 1, characterized in that, The catalyst includes at least one of sulfur, sulfides, phosphoric acid, phosphorous acid, hypophosphoric acid, nano-cerium oxide, nano-titanium dioxide, nano-lanthanum oxide, neodymium oxide, magnesium oxide, zinc oxide, lithium carbonate, calcium hydroxide, and p-toluenesulfonic acid.

5. The tread rubber composition according to claim 1, characterized in that, The esterification reaction is carried out at a temperature of 220-300℃ for 3-20 hours.

6. The tread rubber composition according to claim 1, characterized in that, The raw materials for preparing the rosin resin, by weight, include: 100 parts by weight of rosin 5-22 parts by weight of polyols Catalyst 0.1-1 parts by weight.

7. The tread rubber composition according to claim 1, characterized in that, The hydroxyl value of the rosin resin is below 60 mg / g.

8. The tread rubber composition according to any one of claims 1-7, characterized in that, The filler includes at least one of silica and carbon black.

9. The tread rubber composition according to claim 1, characterized in that, The tread rubber composition also includes plasticizers, coupling agents, vulcanizing agents, accelerators, and antioxidants.

10. The tread rubber composition according to claim 8, characterized in that, The styrene-butadiene rubber in the rubber is 80% by mass.

11. The tread rubber composition according to claim 9, characterized in that, Based on parts by weight, it includes the following components: 80 parts of styrene-butadiene rubber 20 parts butadiene rubber 90 parts of silica 6 parts carbon black 15 parts of naphthenic aromatic oil 20 parts rosin resin 7.2 parts of silane coupling agent 3.5 parts zinc oxide Accelerator CBS 1.8 parts Accelerator DPG 2 parts Anti-aging agent 6 PPD 3 parts 2 portions of wax 2.5 parts stearic acid Two parts sulfur.

12. A method for preparing the tread rubber composition according to any one of claims 1-11, characterized in that, The process includes the following steps: mixing the raw materials in a mixer according to the specified proportions to obtain the final product.

13. The preparation method according to claim 12, characterized in that, The mixing process is carried out in stages: the first stage of mixing is 145℃×300s at a speed of 65rpm; the second stage of mixing is 155℃×180s at a speed of 45rpm.

14. The preparation method according to claim 12, characterized in that, The Mooney viscosity of the tread rubber composition is 55±10 MPa·s at ML 1+4, 125°C.

15. The use of the tread rubber composition according to any one of claims 1-11 or the tread rubber composition prepared by any one of claims 12-14 in the manufacture of tires.

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