DESC:TECHNICAL FIELD
The present disclosure relates to a field of polymer technology. More particularly, the present disclosure relates to tyre tread composition using tannin as a biofiller and method of preparation.

BACKGROUND OF INVENTION
Natural rubber is natural rubber latex that has been dried and baled. Natural rubber possesses unique properties such as self-reinforcement, abrasion, tear, and impact resistance. These properties make natural rubber ideal for applications such as tires, conveyor belts, hoses, and gaskets.
Similarly, solution-based and emulsion-based styrene butadiene rubbers (SBR) and polybutadiene rubber (PBR) are used in tire components of rubber composition to provide its unique properties like grip, low rolling resistance and wear property. Since polymeric materials do not decompose easily, disposal of waste polymers is a serious environmental problem. Increased consumption of rubber is increasing the rubber waste and hence polluting the environment.
Fillers serve either as inexpensive diluents of the more expensive polymer phase or as reinforcing fillers to improve the physical properties of the rubber product. Diluent fillers must be especially low in cost to be of practical use. Historically, diluent fillers have been made from minerals of various kinds. Reinforcing fillers are expensive, can have high carbon footprints and generally require a very small particle size (< 300 nm).
Reference made to the following:
Publication no. JP2012207088 relates to a method of producing a rubber wet master batch, which prevents a filler from aggregating again with time by dispersing the 5 filler uniformly, thereby reducing the amount of coagulants used such as a strong acid. The patent discusses about the use of polyphenols such as tannin, for protecting latex against from natural rubber from the rubber tree Hevea brasiliensis against biological degradation, dispensing with the use of ammonia. With the use of polyphenols for treating latex, the present disclosure provides the production of a natural rubber latex raw material which allows the production of hypoallergenic products for medical use, such as surgical gloves, probes etc., whereas the present disclosure uses tannin as replacement of or in addition to carbon black in tyre tread composition and composition preparation method.
Publication no. IN1135/DEL/2002 relates to a tyre tread compound. The compound has 70-80 parts carbon black, 15-20 parts process oil, 2.5-7.5 parts of corn powder, 2-1.25 parts zinc oxide, 1-2 parts of stearic acid, 1.5-2 parts of sulfur and 1-1.25 parts of accelerators present in every 100 parts of non-extended styrene butadiene rubber and oil extended styrene butadiene rubber, whereas the present disclosure uses tannin as replacement of or in addition to carbon black in tyre tread composition and preparation method of composition.
Publication no. US2020139762 relates to a rubber composition for tire tread or a rubber composition for tire sidewall, comprising one or more rubber components, and a composite powder which comprises a persimmon fruit extract and sodium carbonate and which is in an amount of 1.0 to 10 parts by mass when a total amount of the rubber component(s) is regarded as 100 parts by mass. In the rubber compositions, it is preferable that in the composite powder, a ratio by mass of the persimmon fruit extract to the sodium carbonate is from 1:1 to 5:1. Moreover, in the rubber compositions, it is preferable that when a total amount of the rubber component(s) is regarded as 100 parts by mass, an effective component amount of the persimmon fruit extract in the composite powder is from 0.01 to 8.0 parts by mass, whereas the present disclosure uses tannin as replacement of or in addition to carbon black in tyre tread composition and preparation method of composition.
Publication no. JP2014091810 provides a rubber wet master batch in which stretches at breaking time and tear propagation resistance are excellent, and that becomes a material of a vulcanized rubber in a rubber wet master batch in which carbon black is uniformly dispersed, and reaggregation of carbon black by passing time is suppressed; and a production method of the same. The patent discusses a method for producing a rubber wet masterbatch, wherein at least a carbon black, a dispersion solvent, an anti-aging agent and a rubber latex solution are used as a raw material, wherein the carbon black is dispersed in the dispersion solvent to improve tear propagation resistance and to have a stretch at breaking time, whereas the present disclosure uses tannin as replacement of or in addition to carbon black in tyre tread composition and preparation method of composition to improve the dynamic properties along with wear resistance.
Publication no. JP2022513922 relates to a rubber composition based on at least one functionalized elastomer containing polar functional groups, a reinforcing filler, and a specific polyphenol compound, whereas the present disclosure uses tannin as replacement of or in addition to carbon black in tyre tread composition and preparation method of composition.
Hence there is a need for an improved tread compound, which improves the dynamic mechanical properties along with wear resistance of tyre.

SUMMARY OF THE INVENTION
In first aspect of the present disclosure a tyre tread rubber composition using tannin as biofiller is provided.
In second aspect of the present disclosure, a method for preparing the tyre tread rubber composition using tannin as biofiller is provided.

OBJECTS OF THE DISCLOSURE
The principal object of the present disclosure is to provide a tyre tread composition using tannin as a biofiller.
The other object of the present disclosure is to provide a preparation method of a tyre tread composition using tannin.
Another object of the present disclosure is to provide an improved tread compound which improves dynamic mechanical properties.
Yet another object of disclosure is a partial replacement of reinforcing filler carbon black with tannin as a biofiller in tire tread rubber composition.
Yet another object of the present disclosure is to provide high rubber elasticity.
Still another object of the present disclosure is to provide a cost-effective tread compound.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Various embodiments of the disclosure are discussed in detail below. While specific implementations are discussed, it should be understood that this is done for illustration purposes only. A person skilled in the relevant art will recognize that other components and configurations may be used without parting from the spirit and scope of the disclosure. Numerous specific details are described to provide a thorough understanding of the disclosure. However, in certain instances, known details are not described in order to avoid obscuring the description.
References to one or an embodiment in the present disclosure can be references to the same embodiment or any embodiment; and such references mean at least one of the embodiments. Reference to "one embodiment", "an embodiment", “one aspect”, “some aspects”, “an aspect” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the disclosure. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Moreover, various features are described which may be exhibited by some embodiments and not by others.
The terms used in this specification generally have their ordinary meanings in the art, within the context of the disclosure, and in the specific context where each term is used. Alternative language and synonyms may be used for any one or more of the terms discussed herein, and no special significance should be placed upon whether a term is elaborated or discussed herein. In some cases, synonyms for certain terms are provided.
A recital of one or more synonyms does not exclude the use of other synonyms. The use of examples anywhere in this specification including examples of any terms discussed herein is illustrative only and is not intended to further limit the scope and meaning of the disclosure or of any example term. Likewise, the disclosure is not limited to various embodiments given in this specification. Without intent to limit the scope of the disclosure, examples of instruments, apparatus, methods and their related results according to the embodiments of the present disclosure are given below. Note that titles or subtitles may be used in the examples for convenience of a reader, which in no way should limit the scope of the disclosure. Unless otherwise defined, technical and scientific terms used herein have the meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. In the case of conflict, the present document, including definitions, will be controlled.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or can be learned by practice of the herein disclosed principles. These and other features of the disclosure will become more fully apparent from the following description and appended claims or can be learned by the practice of the principles set forth herein.
As mentioned before, there is a need for an improved tread compound, which improves the dynamic mechanical properties along with wear resistance of tyre.
Therefore, the present disclosure presents a tyre tread composition using tannin as a biofiller. The use of tannin as a bio filler in tyre tread rubber composition to improve modulus, dynamic mechanical properties along with wear resistance of rubber vulcanizate. Thus, it reduces the cost and provides less carbon footprint. The present disclosure relates to the tyre tread composition using tannin as a biofiller and its method of preparation. The tyre tread rubber composition containing 100 phr of an elastomeric matrix or one more rubbers, selected rubbers can be from the blends of NR: BR or NR:SBR: BR or NR: SSBR:BR or SSBR: BR or SBR: BR blend along with reinforcing filler carbon black, 0.25 to 35 phr of Tannin powder as a biofiller as a partial replacement of reinforcing filler carbon black to provide better dynamic mechanical properties along with processing properties.
In another aspect of the present disclosure, selected SBR can be oil extended, or non-oil extended having bound styrene content 40% or it can be lesser than 40%.
In another object of the present disclosure, selected polybutadiene rubber (PBR) can be produced using catalysts like neodymium, cobalt, and nickel.
In another aspect of the present disclosure, reinforcement filler is carbon black and it is selected from the grades which is having any of the colloidal properties like iodine adsorption No. 138 to 152 mg/gm, tinting strength value between 118 to 128 % ITRB, nitrogen surface area value between 121 to 131 m2/gm and COAN value ranges between 90 to 104 cc/100 gm.
In another aspect of the present disclosure, bio filler is derived from renewable resources having greater than 60% tannins by mass and it is characterized by SEM EDS i.e., scanning electron microscopy (SEM) equipped with an energy-dispersive spectroscopy (EDS) system for elemental analysis and the presence of main elements in weight % is as Oxygen content (O K) is 76.48%, Sodium content (Na K) is 13.67%, Potassium content (K K) is 4.07%. Also, the bio filler particle is of spherical shape, and it is embedded with needle shape particles.
In another object of the present disclosure, process oil can be from MES oil or Low PCA oil (Mild Extract Solvate), TDAE oil or any of the naturally occurring oil is used to improve the processability of rubber compounds.
In another object of the present disclosure, protection system is selected from MC Wax and it is migrates to the surface of a tyre/rubber vulcanizate and forms a physical barrier on the rubber's surface, protecting it from ozone and UV light, which can cause degradation and cracking or with the combination of total protection system consisting of MC Wax, 6PPD, TMQ and/or Pil 100 etc., in the range of 0.5 phr to 5 phr.
In another object of the present disclosure, the activator system is Zinc oxide and stearic acid to activate sulphur vulcanization. Moreover, Stearic acid, is a process aid. Also, zinc oxide reacts with stearic acid forming zinc stearate which is essential for improving the efficiency of crosslinking from 3F Industries, Andhra Pradesh.
In another object of the present disclosure, primary accelerator is selected from sulfonamide accelerators like CBS - (N-cyclohexyl-2-benzothiazolesulfenamide) or can be from TBBS, TMTD, MBTS, TBzTD etc.,
In another object of the present disclosure, the vulcanizing agent is selected from Sulphur or insoluble sulphur.
Table 1 Rubber Composition in Phr

Ingredients C1, Control Rubber Composition (Comparative Example) Formulation related to invention (Examples)
F1 F2
NR 1 20.00 20.00 20.00
PBR 2 20.00 20.00 20.00
SBR 1739 3 82.50 82.50 82.50
Carbon Black N110 4 72.00 57.00 37.00
Tannin Bio Filler 5 - 15.0 35.0
MES OIL or Low PCA Oil 6 6.00 6.00 -
MC Wax 7 1.50 1.50 1.50
Zinc Oxide 8 2.50 2.50 2.50
Stearic Acid 9 1.50 1.50 1.50
Sulphur 10 1.35 1.35 1.35
CBS 11 1.35 1.35 1.35

1. NR, ISNR 20 Indian Standard Natural Rubber ISNR 20 from M/s. Mamparambil Rubber India Pvt ltd, India,
2. PBR – It is a high cis content greater than 96% from Kumho Petrochemical Ltd., Korea.
3. SBR 1739 - It is oil extended styrene butadiene rubber (emulsion polymerized) with 40% of bound styrene content from Reliance Industries Limited, India.
4. Carbon Black N110 -ASTM Grade N110 from PBCL (TN) Ltd, Chennai. It is the reinforcing filler SAF, Superior Abrasion Furnace having the Iodine adsorption No. 138 to 152 mg/gm, tinting strength value between 118 to 128 % ITRB, nitrogen surface area value between 121 to 131 m2/gm and COAN value ranges between 90 to 104 cc/100 gm.
5. Bio filler Tannin - Tannin or Cutch Tannin powder is derived from renewable resources having greater than 60% tannins by mass and it is characterized by SEM EDS i.e., scanning electron microscopy (SEM) equipped with an energy-dispersive spectroscopy (EDS) system for elemental analysis and the presence of main elements in weight % is as Oxygen content (O K) is 76.48%, Sodium content (Na K) is 13.67%, Potassium content (K K) is 4.07%, etc., is obtained from Agrosyn Impex, Reg.office: 374/1 Sarodhi Tighra Road Sutrai Falia, Village: SARODHI;Taluka – Pardi; District – Valsad; Gujarat 396185 India.
6. Process Oil – MES oil or Low PCA oil (Mild Extract Solvate) is used to improve the processability of rubber compounds from GP Petroleums limited, India.
7. MC Wax –It is migrating to the surface of a tyre/rubber vulcanizate and forms a physical barrier on the rubber's surface, protecting it from ozone and UV light, which can cause degradation and cracking. It is from Gujarat Paraffins Private limited, India
8. Zinc oxide - It is an activator added to the rubber compound to activate sulphur vulcanization from Pondy Oxides & chemicals Ltd, Kancheepuram, Tamilnadu.
9. Stearic acid - It is a process aid. Also, zinc oxide reacts with stearic acid forming zinc stearate which is essential for improving the efficiency of crosslinking from 3F Industries, Andhra Pradesh.
10. CBS - (N-cyclohexyl-2-benzothiazolesulfenamide) It is a delayed action accelerator suitable for diene rubbers from Nocil Limited, India.
11. Sulphur - Sulphur is the vulcanizing agent from The Standard Chemical Co. Pvt Ltd, India.
Mixing Sequence:
Using a Banbury mixer with a tangential rotor, a tyre tread rubber composition prepared by a thermo- mechanical process is as follows:
The method of preparation of tyre tread rubber composition includes following steps:
A) Preparation of Master batch:
Mixing is done with the rotation speed of the mixer between 50 to 60 rpm and with the head temperature of the Banbury mixer with a tangential rotor maintained between 70 to 80°C.
Step I: Mixing chamber has been charged with the elastomers and tannin as biofiller and allowed to mix for 20 to 70 seconds to provide uniform dispersion of biofiller tannin in elastomer matrix.
Step II: The reinforcing filler carbon black, process oil, zinc oxide, stearic acid, and MC Wax are added, and allowed to mix for 120 to 200 seconds,
Step III: Sweeping down in the orifice the masterbatch rubber compound and allowed it to mix for 90 to 150 seconds. The masterbatch rubber compound is sheeted out in the laboratory two-roll mill.
B) Preparation of final batch:
The final batch preparation includes following steps:
Mixing chamber charged with the master batch and the curatives namely sulphur, accelerator is added, and allowed to mix for 60 to 90 seconds, and the final batch compound is dumped at the temperature range of 95°C to 110°C. The final batch sheet out has been done in the laboratory two roll mill.
Characterization of Cured Rubber Vulcanizate and Uncured Rubber Compound:
Tests:
M1. Better processability (Process Requirements) of a Rubber Compound:
The Mooney Scorch measurements are carried out with a Mooney Viscometer (MV 2000 Alpha technologies, USA) according to ASTM D1646. MV indicates the minimum viscosity, t5 indicates the time to scorch (MV+5) which indicates the processing properties (process safety).
M2. Shore A hardness of the rubber vulcanizate is assessed in accordance with ASTM D 2240.
M3. Tensile properties of the rubber vulcanizate is accessed in accordance with ASTM D412.
Tensile Strength multiplied by elongation at break value of rubber vulcanizates indicates its toughness This value represents the total amount of energy the material can absorb before it fractures. The value greater than 4200 is suitable for tyre tread rubber compounds.
M4. High Rubber Elasticity of Rubber Vulcanizate
Rebound Resilience of Rubber Vulcanizate is measured in accordance with ASTM D 7121 using Rebound Resilience tester. Higher the index value indicates the high rubber elasticity.
M5. The dynamic properties of the rubber vulcanizate are measured on a dynamic mechanical analyzer (DMA Metravib +1000) in tension mode as per ASTM D5992.
Test Conditions temperature sweep; -40 Deg C to + 80 Deg C; Frequency 10 Hz; Static Strain: 0.6%, Dynamic Strain: 0.3%.
Tan delta at 0 Deg C indicates the wet grip of tyre. Higher the tan delta value is good to obtain wet grip and tan delta at 60 Deg C indicates the rolling resistance. Lower the tan delta value is good to obtain lower rolling resistance property.
Tan delta at – 10 Deg C indicates the ice traction and higher tan delta value is good to obtain wet grip. Higher the index value is better.
E’ at -20 Deg C indicates the snow traction, lower the E’ value indicates the winter traction and lower the index value is better.
E* at -20 Deg C indicates the snow traction, lower the E’ value indicates the snow traction and lower the index value is better.
A dynamic stiffness (E*) that is lower at cold temperatures indicates that the rubber compound can provide optimal performance in sub-freezing conditions, as it allows the tire to remain flexible and maintain grip on cold surfaces. Lower the index value is better.
Table 2: Characterization of Rubber Compound and Rubber Vulcanizate
Properties C1 F1 F2 F1, Index F2, Index
M1. Processability of Rubber Compound
T5, minutes: minutes
(t5 value greater than 15 minutes is suitable for tread compounds) 39.22 36.03 31.30 - -
M2. Hardness of Rubber Vulcanizate
Hardness, Shore A 65 67 52 - -
M3. High Rubber Elasticity of Rubber Vulcanizate
Rebound Resilience at 23+/- 2 Deg C, %
(Higher the Index Value is better) 30.11 34.34 41.39 114.05 120.53
M4. Dynamic Mechanical Properties of Rubber Vulcanizate
Tan delta at -10 Deg C
(Higher the Index Value is better) 0.485 0.516 0.611 106.39 125.98
Tan delta at 0 Deg C
(Higher the Index Value is better) 0.373 0.380 0.392 101.88 103.16
Tan delta at 60 Deg C
(Lower the Index Value is better) 0.237 0.227 0.235 95.78
99.16
E* at -20 Deg C
(Lower the Index Value is better) 158.0 86.1 68.9 54.49
43.61
E’ at -20 Deg C, Mpa
(Lower the Index Value is better) 137.0 71.7 53.0 52.34
38.69

In the present invention, two rubber compositions (examples – rubber composition related to invention are prepared and its properties are measured against the control rubber composition (comparative example).
Two rubber compositions based on NR (20 phr): SBR (60 phr): PBR (20 phr) formulation, reinforced by reinforcing filler carbon black is partially replaced with 15 & 35 phr of biofiller tannin against NR (20 phr):SBR (60 phr): PBR (20 phr) based formulation reinforced by 72 phr of carbon black (Control, C1) are prepared and evaluated.
The present invention provides a 100 parts by weight of rubber composition (F1, F2) NR:SBR:BR tri blend based rubber composition reinforced by reinforcing filler carbon black is partially replaced with 15 & 35 phr of biofiller tannin provides t5 values 36.03 minutes & 31.30 minutes respectively when compared to NR:SBR:BR based rubber composition containing reinforcing filler carbon black, F1 (Control/Comparative example). Ideal t5 value of tread compound is about 15 minutes @ 125 Deg C.
The present invention provides a 100 parts by weight of rubber composition (F1, F2) NR:SBR:BR tri blend based rubber composition reinforced by reinforcing filler carbon black is partially replaced with 15 and 35 phr of bio filler tannin provides t5 values as 36.03 minutes & 31.30 minutes respectively when compared to NR:SBR:BR based rubber composition containing reinforcing filler carbon black, F1 (Control/Comparative example). Ideal t5 value of tread compound is about 15 minutes @ 125 Deg C.
Also, the present invention provides a 100 parts by weight of rubber composition (F1, F2) NR:SBR:BR tri blend based rubber composition reinforced by reinforcing filler carbon black is partially replaced with 15 and 35 phr of bio filler tannin replaced with reinforcing filler provides hardness value as 67 Shore A and 52 Shore A respectively when compared to NR:SBR:BR based rubber composition containing reinforcing filler carbon black, F1 (Control/Comparative example).
Futher, the present invention provides a 100 parts by weight of rubber composition (F1, F2) NR:SBR:BR tri blend based rubber composition reinforced by reinforcing filler carbon black is partially replaced with 15 and 35 phr of bio filler tannin provides high rubber elasticity and it is improved by 14.05% and 20.53% respectively when compared to NR:SBR:BR based rubber composition containing reinforcing filler carbon black, F1 (Control/Comparative example).
Futher, the present invention provides a 100 parts by weight of rubber composition (F1, F2) NR:SBR:BR tri blend based rubber composition reinforced by reinforcing filler carbon black is partially replaced with 15 and 35 phr of bio filler tannin provides high rubber elasticity and it is improved by 14.05% and 20.53% respectively when compared to NR:SBR:BR based rubber composition containing reinforcing filler carbon black, F1 (Control/Comparative example).
Moreover, the present invention provides a 100 parts by weight of rubber composition (F1, F2) NR:SBR:BR tri blend based rubber composition reinforced by reinforcing filler carbon black is partially replaced with 15 and 35 phr of bio filler tannin provides better ice grip (tan delta at -10 Deg C) and it is improved by 6.39% and 25.98%, optimum wet grip (tan delta at 0 Deg C) and it is improved by1.88% and 3.16%, lower rolling resistance (tan delta at 60 Deg C) and it is improved from comparable to 4.22%.
Moreover, the present invention provides a 100 parts by weight of rubber composition (F1, F2) NR:SBR:BR tri blend based rubber composition reinforced by reinforcing filler carbon black is partially replaced with 15 and 35 phr of bio filler tannin provides better winter traction (E’ at -20 Deg C) and it is improved by 45.51% and 56.39% and also provides E* at -20 Deg C is lowered by 47.66% and 61.39% which clearly indicates that the tyre remain flexible in cold, winter and snowy conditions.
Hence, the present invention NR:SBR:BR tri blend-based rubber composition reinforced by reinforcing filler carbon black is partially replaced with 15 and 35 phr of bio filler tannin provides better ice grip, winter traction along with optimum wet grip and lower rolling resistance and its hardness of rubber vulcanizate ranging from 52 to 67 Shore A. Further, the present invention NR:SBR:BR tri blend based rubber composition reinforced by reinforcing filler carbon black is partially replaced with 15 and 35 phr of bio filler tannin provides better processing properties.
Advantages:
• Tyre tread compound reinforced by reinforcing filler carbon black is partially replaced with biofiller tannin provides better ice grip, winter traction and optimum wet grip and lower resistance can be used for all seasoned two-wheeler tyres, and it is most suitable for winter tyres.
• Tyre tread compound containing environmentally friendly renewable materials which helps to satisfy regulations and focus on sustainability.
• Tyre tread compound containing environmentally friendly renewable materials which helps to reduce the carbon footprint. ,CLAIMS:WE CLAIM
1. A rubber composition for a pneumatic tire tread, formulated on the basis of 100 parts by weight of elastomer (phr), comprising:
? an elastomer matrix – 100 phr;
? reinforcing carbon black – 20 to 80 phr;
? bio filler tannin – 0.25 to 35 phr;
? process oil – 0 to 10 phr;
? microcrystalline (MC) wax – 1 to 2 phr;
? N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine– 1 to 2 phr;
? zinc oxide – 2 to 3.5 phr;
? stearic acid – 1 to 3.5 phr;
? sulfur – 1 to 2 phr; and
? N-cyclohexylbenzothiazole-2-sulfenamide (CBS) – 1 to 2.5 phr;
? wherein phr denotes parts by weight per 100 parts of total elastomer,
? wherein biofiller tannin having greater than 60% tannins by mass.
2. The composition as claimed in claim 1, wherein the elastomer matrix comprises styrene-butadiene rubber (SBR) 10–90 phr, polybutadiene rubber (PBR) 10–60 phr, and natural rubber (NR) 10–80 phr.
3. The composition as claimed in claim 1, wherein the tannin is a bio filler having main elements of oxygen content (O K) is 76.48%, Sodium content (Na K) is 13.67%, Potassium content (K K) is 4.07%.
4. The composition as claimed in claim 3, wherein the biofiller tannin is a spherical particle embedded with needle shape particle.
5. The composition as claimed in claim 1, wherein the process oil is MES (Mild Extracted Solvate) oil or TDAE oil.
6. The composition as claimed in claim 1, wherein the biofiller tannin is used to replace partially the reinforcing filler carbon black.
7. The composition as claimed in claim 1, wherein the biofiller tannin partially replaces carbon black in an amount of 0.35 to 35 phr, thereby improving winter traction, and lowering rolling resistance.
8. The composition as claimed in claim 1, wherein the biofiller tannin partially replaces carbon black in an amount of 0.35 to 35 phr, thereby enhancing process safety, high rubber elasticity and ice grip with wet grip.
9. The composition as claimed in claim 1, wherein the selected elastomer SBR having bound styrene content lesser than 40%.
10. The composition as claimed in claim 1, wherein the accelerator system comprises CBS, and the protective system comprises MC wax, optionally along with the antidegradant like 6PPD, TMQ, Pil 100.
11. A method of preparation of rubber composition for tire tread comprising:
Step 1: Preparing a master batch by charging a Banbury mixer with rubbers and biofiller tannin, mixing for 20 to 70 seconds at a head temperature of 70 °C to 80 °C and an unloaded rotor speed of 50 to 60 rpm, sequentially adding carbon black, process oil, and MC wax, allowing mixing for 120 to 200 seconds, then dumping the masterbatch mixture and sheeting out the rubber compound in a laboratory two-roll mill;
Step 2: Charging the master-batch of Step into a mixing chamber, adding accelerator and sulfur as vulcanization agent and mixing for 60 to 90 seconds, dumping the rubber compound at 95 °C to 110 °C, followed by sheeting out the final batch rubber compound in a laboratory two-roll mill.
12. The method as claimed in claim 11, wherein the rubber composition obtained exhibits improved winter traction, ice grip, wet grip and lower rolling resistance, high rubber elasticity with the tyre tread hardness of 52 to 67 Shore A while maintaining the processability.