DESC:TECHNICAL FIELD OF THE INVENTION
The present invention relates to the field of Polymer Technology. The present invention in particular relates to the use of bio carbon black in tyre innerliner rubber composition and its method of preparation.
BACKGROUND OF THE INVENTION
Carbon black is used as a filler, pigment and/or reinforcing material in polymer composites, for example, in rubbers and in plastic master batches. Manufacturers require consistent quality and consistency in the carbon black. Price is also a major factor when selecting a carbon black. Tire companies and compounders do selection of a carbon black based on its dispersive properties, hardness of the pellet, colloidal properties of the carbon black based on the end-product requirements and its functions. Quality is increasingly being recognized as an aspect of cost savings and thus as a basis for competition.
Bio carbon black which is obtained from sustainable wood residue can be replacement for the reinforcing filler carbon black produce using fossil resources like petroleum, natural gas etc. Use of Bio carbon black is very limited in moulded rubber goods and tyres. Now a days, more initiatives are taken towards to reduce carbon foot print. Potential use of bio carbon black in tyre rubber composition shall be a major contribution in reducing the carbon foot print.
Publication No. IN 202241033225 relates to a motorcycle tyre tread base rubber composition using recovered carbon black and its method thereof. A motorcycle tyre tread base rubber composition includes 100 parts by weight of a rubber; with the tri-blend NR, SBR and PBR or NR and PBR blend; produced using conventional reinforcing carbon black grade N220 or N330 replaced with 5 to 20 phr of recovered carbon black provides better processing properties, lower Payne effect, lower rolling resistance along with high rubber elasticity whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition.
Publication No. IN 201621013899 an innerliner system for pneumatic tubeless tyre comprising a single innerliner layer, said layer being air-impermeable and compatible with inner ply eliminating the need for additional layers in innerliner systems whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition.
Publication No. IN 202041048775 provides a tyre innerliner nanocomposite and its method of preparation, capable of providing lower modulus, improved barrier and processability characteristics. The rubber composition of tyre innerliner includes 100 phr of rubber selected from natural rubber (NR), non-oil extended styrene butadiene rubber, poly butadiene rubber, reinforcing filler such as carbon black, naturally occurring, unmodified fuller’s earth nanoclay. It further discloses a tyre comprising the innerliner nanocomposite whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition.
Publication No. US2821232 relates to the rubber tire tread composition containing carbon black and silica and tire made from same. The referred patent discusses about the tire tread rubber composition containing carbon black having surface area in the range-of 50 to 200 square meters per gram whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition having specific surface area value ranges from 16 to 28 m2/ gm.
Publication No. US6476154 relates to the rubber composition is provided comprising a diene-based elastomer, a vulcanizing agent, a vulcanizing accelerator and a reinforcement comprising a conical carbon. The present invention discusses about use of conical carbon comprises cones, flat plates, nanotubes in rubber composition wherein said conical carbon has an Iodine number of less than 30 g/kg and a DBP number of greater than 150 cm3/100 gm whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition having oil absorption no value ranges from 62 to 73 cc/100 gm.
Publication No. EP1254786 relates to a tire has a circumferential tread of a cis 1,4-polyisoprene rubber based rubber composition reinforced with a carbon black/silica composite. The carbon black/silica composite is a treated carbon black having silicon-containing domains, namely domains of silica, primarily on the surface of the carbon black. The referred patent discusses about the tire tread rubber composition containing treated carbon black having silicon contain domains whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition, and it is not treated with silicon domains.
Publication No. IN202217008179 relates to a Composite particles may be produced by drying slurries containing silica particles and graphenic carbon particles in a liquid carrier. Elastomeric formulations comprising a base elastomer composition and the silica-graphenic carbon composite particles are also disclosed. The formulations possess favorable properties such as increased stiffness and are useful for many applications such as tire treads. The referred patent discusses about the silica-graphenic carbon composite particles whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition.
Publication No. IN202117044363 relates to a cross-linkable rubber composition, the cross-linkable rubber composition comprising, based upon parts by weight per 100 parts by weight rubber (phr): =60 phr to =80 phr of a butadiene rubber, a syndiotactic 1, 2-polybutadiene, coupling agent, a filler, and a resin, wherein the composition comprises =10 phr to =20 phr of the syndiotactic 1, 2- polybutadiene, and wherein the composition comprises =1 phr to =20 phr of at least two coupling agents wherein one of the coupling agents is or comprises a mercapto based silane and wherein the ratio of the mercapto based silane to the second coupling agent is in the range of = 2:1 to =:10:1. The referred patent relates to a cross-linkable tyre tread rubber composition containing two coupling agents mercapto based silanes and disulfide silanes, tetra sulfide silanes or a combination thereof whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition and it doesn't contain any type of coupling agent.
Publication No. IN202117007010 relates to a filler comprising a recovered carbon black having an iodine adsorption number, measured according to ASTM D- 1510-17 of between 9 g/kg and 160 g/kg, preferably between 115 g/kg and 140 g/kg. The referred patent discusses about a filler comprising a recovered carbon black having an iodine adsorption number, measured according to ASTM D- 1510-17 of between 9 g/kg and 160 g/kg, preferably between 115 g/kg and 140 g/kg in tyre, such as, a passenger car tyre, a truck tyre, an agricultural tyre, an OTR (off-the-road) tyre, an aircraft tyre, a solid tyre, a bicycle tyre or a mining tyre whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition. Both the fillers are entirely different from each other.
Publication No. IN201931051577 relates to the carbon black composition to improve aesthetic and mechanical properties of elastomer compounds. The referred patent discusses about the use of novel filler along with conventional ASTM grade in different ratio in elastomeric compound to improve properties such as tensile strength, elongation at break, tear strength, cut growth etc. along with improvement of the aesthetic and colour properties whereas present invention discusses about the use of bio carbon black in tyre innerliner rubber composition.
Hence there needed an improved tyre innerliner nanocomposite which is low cost and also to provide low air permeability.
OBJECT OF THE PRESENT INVENTION
The principal object of the present invention is to provide the bio carbon black in tyre innerliner rubber composition and its method of preparation.
Another object of the present invention is to provide rubber composition is in low cost.
Yet another object of the present invention is to replace reinforcing filler carbon black obtained from fossil resources with the bio filler carbon black obtained from wood residues.
Yet another object of the present invention is to provide lower air permeability i.e., better barrier properties
SUMMARY OF THE INVENTION
One or more of the problems of the conventional prior art may be overcome by
In one aspect of the present disclosure, a tyre innerliner rubber composition is provided.
The composition includes an elastomeric matrix comprising 100 parts by weight of rubber selected from the group comprising of natural rubber (NR), oil-extended styrene-butadiene rubber (SBR), and butyl rubber (IIR). The composition further includes bio carbon black as a filler, wherein the carbon weight percentage of the bio carbon black is greater than 75% as measured through SEM EDAX, the bio carbon black having an oil absorption number value ranging from 62 to 73 cc/100 gm and a specific surface area value ranging from 16 to 28 m²/gm, and wherein, the bio carbon black is present in an amount ranging from 20.0 to 120.0 parts by weight per 100 parts by weight of rubber (phr). The composition further includes process oil present in an amount ranging from 5.0 to 25.0 phr. The composition further includes antidegradant 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ) present in an amount ranging from 1.0 to 3.0 phr. The composition further includes accelerator N-tert-butylbenzothiazyl-2-sulfenamide (TBBS) present in an amount ranging from 1.0 to 3.0 phr. The composition further includes vulcanizer sulfur present in an amount ranging from 1.0 to 3.0 phr.
In some aspects of the present disclosure, the bio carbon black is manufactured using renewable resources like tree wood having a calorific value.
In some aspects of the present disclosure, the hardness of the rubber composition ranges from 53 to 63 Shore A.
In some aspects of the present disclosure, the oxygen transmission rate of the rubber composition is 29.694 to 115.710 cc/m².gm.
In some aspects of the present disclosure, the oxygen transmission rate index is lower than 85.511.
In second aspect of the present disclosure, a method of preparing a tyre innerliner rubber composition is provided.
The method includes mixing bio carbon black with an elastomeric matrix and other ingredients to form a master batch. The method further includes adding the master batch to a mixer and mixing with an accelerator and a vulcanization agent to form a final batch. The method further includes sheeting out the final batch.
In some aspects of the present disclosure, the step of preparing the master batch includes charging a mixing chamber with rubbers and allowing them to mix for 0 to 35 seconds, adding bio carbon black as a filler, process oil, and rubber chemicals including antidegradant, and allowing them to mix for 110 to 280 seconds, sweeping in the orifice and allowing the mixture to mix for another 45 to 80 seconds and dumping the rubber compound at a temperature in the range of 140°C to 155°C and sheeting it out in a laboratory two-roll mill.
In some aspects of the present disclosure, the step of preparing the master batch further includes adding the master batch to a Lab Banbury Mixer and mixing for 90 to 160 seconds and dumping the rubber compound at a temperature of 110 to 140°C and sheeting it out in a laboratory two-roll mill.
In some aspects of the present disclosure, the step of preparing the final batch includes charging a mixing chamber with the master batch rubber compound and mixing for 5 to 30 seconds, adding the accelerator and vulcanization agent and mixing for 60 to 90 seconds, dumping the rubber compound at a temperature in the range of 95°C to 115°C and sheeting it out in a laboratory two-roll mill.
BRIEF DESCRIPTION OF DRAWINGS
The accompanying drawings, which are incorporated in and constitute a part of this specification, show certain aspects of the subject matter disclosed herein and, together with the description, help explain some of the principles associated with the disclosed implementations. In the drawing,
Figure 1 illustrates an image representing particles of biocarbon black analyzed with HRTEM at 50 nm, in accordance with an aspect of the present disclosure;
Figure 2 illustrates an image representing particles of biocarbon black analyzed with HRTEM at 200 nm, in accordance with an aspect of the present disclosure; and
Figure 3 illustrates an image representing particles of biocarbon black analyzed with SEM at 50 µm, in accordance with an aspect of the present disclosure.
It is to be noted, however, that the drawings illustrate only a preferred embodiment of the invention and is therefore not to be considered limiting of the invention's scope as it may admit to other equally effective embodiments.
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. Thus, the following description and drawings are illustrative and are not to be construed as limiting. 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 or not a term is elaborated or discussed herein. In some cases, synonyms for certain terms are provided.
Although the invention has been described and illustrated with respect to the exemplary embodiments thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omissions and additions may be made therein and thereto, without parting from the spirit and scope of the present invention.
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. The features and advantages of the disclosure can be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. 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 technology that overcomes these drawbacks associated with the prior arts. The present disclosure, therefore, also provides a tyre innerliner rubber composition and method of preparing tyre innerliner rubber composition. In order to overcome above listed prior art, the present disclosure aims to provide the bio carbon black in tyre innerliner rubber composition and its method of preparation. The present disclosure relates to a tyre innerliner rubber composition and its method of preparation which is capable of providing improved barrier properties and processability characteristics.
In some aspects of the present disclosure, a tyre innerliner rubber composition is provided. The tyre innerliner rubber composition includes an elastomeric matrix.
In some aspects of the present disclosure, the elastomeric matrix comprises 100 parts by weight of a rubber, selected from natural rubber (NR), oil extended styrene butadiene rubber (SBR), butyl rubber (IIR), bio carbon black as a filler wherein the carbon weight % of Bio carbon black is greater than 75% which is measured through SEM EDAX, wherein the bio carbon black has an oil absorption number value ranging from 62 to 73 cc/100 gm and a specific surface area value ranging from 16 to 28 m2/gm.
In some aspects of the present disclosure, the bio carbon black is manufactured using renewable resources like tree wood (biomass) having high calorific value 2400 Kcal/kg to 4500 Kcal/Kg, and particularly 4500 Kcal/Kg.
In some aspects of the present disclosure, the bio carbon black is present in an amount ranging from 20.0 to 120.0 parts by weight per 100 parts by weight of rubber (phr).
The tyre innerliner rubber composition further includes activators, process oil, antidegradant, accelerator, and vulcanizer.
In some aspects of the present disclosure, the activators comprise zinc oxide and stearic acid.
In some aspects of the present disclosure, the process oil is present in an amount ranging from 5.0 to 25.0 phr.
In some aspects of the present disclosure, the antidegradant is 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ) is present in an amount ranging from 1.0 to 3.0 phr.
In some aspects of the present disclosure, the accelerator is N-tert- butylbenzothiazyl-2-sulfenamide (TBBS) and is present in an amount ranging from 1.0 to 3.0 phr.
In some aspects of the present disclosure, the vulcanizer is sulfur and is present in an amount ranging from 1.0 to 3.0 phr.
A method of preparing a tyre innerliner rubber composition, in accordance with an aspect of the present disclosure. The method includes the following steps:
At step 1 the method includes mixing bio carbon black with an elastomeric matrix and other ingredients to form a master batch.
At step 2 the method includes rewarming the step 1 master batch to form a master batch.
At step 3, the method includes adding the master batch obtained from step 2 to a Banbury mixer and mixing with an accelerator and a vulcanization agent to form a final batch and sheeting out the final batch.
A method of preparing a master batch associated with the method of preparing a tyre-innerliner rubber composition, in accordance with an aspect of the present disclosure.
At step 1, charging a mixing chamber with rubbers and allowing them to mix for 0 to 35 seconds.
Adding bio carbon black as a filler, process oil, and rubber chemicals including antidegradant, and allowing them to mix for 110 to 280 seconds.
sweeping in the orifice and allowing the mixture to mix for another 45 to 80 seconds.
dumping the rubber compound at a temperature in the range of 140°C to 155°C and sheeting it out in a laboratory two-roll mill.
At step 2, adding the step 1 master batch to a Lab Banbury Mixer and mixing for 90 to 160 seconds.
dumping the rubber compound at a temperature of 110 to 140°C and sheeting it out in a laboratory two-roll mill to obtain master batch.
A method of preparing a final batch associated with the method of preparing a tyre innerliner rubber composition, in accordance with an aspect of the present disclosure. The method includes the following steps:
charging a mixing chamber with the step 2 master batch rubber compound and mixing for 5 to 30 seconds.
adding the accelerator and vulcanization agent and mixing for 60 to 90 seconds.
dumping the rubber compound at a temperature in the range of 95°C to 115°C and sheeting it out in a laboratory two-roll mill.
Figure 1 illustrates an image representing particles of biocarbon black analyzed with HRTEM at 50nm, in accordance with an aspect of the present disclosure. Figure 2 illustrates an image representing particles of biocarbon black analyzed with HRTEM at 200nm, in accordance with an aspect of the present disclosure. Figure 3 illustrates an image representing particles of biocarbon black analyzed with SEM at 50µm, in accordance with an aspect of the present disclosure.
Method of Preparation of a rubber composition for tyre innerliner rubber composition
In some aspects of the present disclosure, a method of preparing a tyre innerliner rubber composition is provided. The method of preparing a tyre innerliner rubber composition include mixing bio carbon black with an elastomeric matrix and other ingredients to form a master batch. The method of preparing a tyre innerliner rubber composition further include adding the master batch to a mixer and mixing with accelerator and vulcanization agent to form a final batch. The method of preparing a tyre innerliner rubber composition further include sheeting out the final batch.
Step 1: preparation of master batch
Mixing was done with the head temperature of the Banbury maintained between 65 °C and 80°C and the unloaded rotor speed maintained between 45 and 60 rpm.
The mixing cycle was followed as: a) The mixing chamber was charged with rubbers and allowed to mix for 0 to 35 seconds. b) Bio carbon black was added as a filler, process oil, and rubber chemicals like antidegradant, and they were allowed to mix for 110 to 280 seconds. c) Sweeping was done in the orifice and the mixture was allowed to mix for another 45 to 80 seconds. The rubber compound has been dumped at a temperature in the range of 140°C to 155°C and sheeted out in the laboratory two roll mill.
Step 2: Master Batch Preparation
Step I master batch was added to the Lab Banbury Mixer and mixed for 90 to 160 seconds. The rubber compound has been dumped at a temperature of 110 to 140°C and sheeted out in the laboratory two roll mill.
Step 3: Final Batch Preparation
The mixing chamber was charged with the Step II master batch rubber compound and mixed for 5 to 30 seconds. The accelerator and vulcanization agent were added, and the mixture was mixed for 60 to 90 seconds. The rubber compound was dumped at a temperature in the range of 95°C to 115°C. The final batch has been sheeted out in the laboratory two roll mill.
Table 1 depicts rubber composition in phr.
Ingredients Control C1, phr Rubber Composition related to invention
F1, phr F2, phr F3, phr F4, phr
Natural Rubber,
ISNR 20 1 60.00 60.00 60.00 60.00 60.00
SBR 1723 2 41.25 41.25 41.25 41.25 41.25
Butyl Rubber, IIR 3 10.00 10.00 10.00 10.00 10.00
Carbon Black N326 4 50.00 40.00
Bio Carbon black 5 20.00 50.00 75.00 100.00
TMQ 6 1.50 1.50 1.50 1.50 1.50
Zinc oxide 7 3.50 3.50 3.50 3.50 3.50
Stearic acid 8 2.00 2.00 2.00 2.00 2.00
TBBS 9 1.50 1.50 1.50 1.50 1.50
Sulphur 10 1.50 1.50 1.50 1.50 1.50
1. The Natural rubber ISNR 20 from Alpha Rub Trading Manufacturing, Kerala.
2. The Styrene butadiene rubber (SBR 1723) having 37.5% oil extended with TDAE oil & 23.5 weight % of Bound styrene content from Reliance Industries, Gujarat. i.e., the rubber composition contains 11.25 phr of process oil (TDAE oil).
3. The Butyl Rubber, IIR from Reliance Sibur Elastomers Pvt ltd, Gujarat.
4. The Carbon Black N326 ASTM grade carbon black having iodine adsorption number ranges from 77 to 87 mg/gm, oil absorption number ranges from 67 to 77 gm/100 gm, nitrogen surface area (specific surface area) ranges from 73 to 85 m2/gm and tinting strength ranges from 106 to 116 % ITRB from Himadri Carbon Black, West Bengal.
5. The Bio Carbon Black having the carbon weight percentage of the bio carbon black is greater than 75% as measured through SEM EDAX, the bio carbon black having an oil absorption number value ranging from 62 to 73 cc/100 gm and a specific surface area value ranging from 16 to 28 m²/gm from Engrow Carbon Energy Private Limited, Erode, Tamilnadu, India.
6. The TMQ is an antioxidant to protect the rubber articles from oxidative degradation at room temperature as well as higher temperatures from Nocil Ltd, Mumbai.
7. The Zinc Oxide is as an activator for the rubber compound to activate the sulphur vulcanization from POCL, Tamil Nadu.
8. The Stearic Acid from 3F Industries Ltd, Nellore, Andhra Pradesh. It is used as a Process aid. Also, Zinc oxide and Stearic acid are added to form zinc soap, improves the solubility of zinc oxide in the compound, and with the accelerator to form a complex, this complex reacts with sulphur to produce a strong cure activating system.
9. The TBBS (N-tert-butyl-2-benzothiazole sulfenamide) is a delayed action accelerator from Shandong Sunshine Chemical co ltd, China.
10. The Sulphur is the vulcanizing agent from Southern Minerals & Chemicals, Kerala.
The compound properties are listed in Table 2 as mentioned below:
Table 2: Characterization of cured rubber vulcanizate & uncured rubber compound of NR: SBR: IIR triblend based tyre innerliner rubber composition
Properties Control, C1 Rubber Composition related to invention
F1 F2 F3 F4
t5, minutes: minutes
(t5 value greater than 15 minutes is good for processability) 21.6 21.43 28.97 24.78 19.93
Hardness, Shore A 62 63 56 53 59
Oxygen Transmission Rate (OTR), cc/m2.gm 115.710 96.060 98.949 56.250 29.694
Oxygen Transmission Rate (OTR), Index
(Lower the index value is better) 100 83.01
85.511
48.61
25.66

The purpose of these tests is to measure the improved properties of the formulation related to the invention against control formulation. For this, NR: SBR: IIR tri blend based tyre inner liner rubber composition F1 reinforced by N326 carbon black 50 phr was replaced with bio carbon black 20 phr (F1) having specific surface area value ranging from 16 to 28 m2/gm and oil absorption number ranging from 62 to 73 cc/100 gm were prepared against NR: SBR: IIR triblend based tyre innerliner rubber composition reinforced by carbon black grade N326 (C1) was prepared and evaluated.
Also, three NR: SBR: IIR tri blend based tyre innerliner rubber composition F2, F3, F4 reinforced by bio carbon black 50 phr to 100 phr having specific surface area value ranging from 16 to 28 m2/gm and oil absorption number ranging from 62 to 73 cc/100 gm were prepared against NR: SBR: IIR triblend based tyre innerliner rubber composition reinforced by carbon black grade N326, C1 was prepared and evaluated.
The present disclosure provides a tyre innerliner NR: SBR: IIR tri-blend based rubber composition reinforced by N326 carbon black 50 phr is replaced with bio carbon black 20 phr (F1) gave t5 value is 19.47 minutes which indicates the process safety when compared to NR: SBR: IIR triblend tyre inner liner rubber composition C1 reinforced by 50 phr of N326 carbon black (Control) having t5 value 21.6 minutes. Note: t5 value greater than 18 minutes is good for processability.
Further, the present invention provides a tyre innerliner NR: SBR: IIR tri-blend based rubber composition (F2, F3, F4) reinforced by bio carbon black 50 phr to 100 phr gave t5 values ranges from 19.93 to 28.97 minutes which indicates process safety when compared to NR: SBR: IIR triblend tyre inner liner rubber composition C1 reinforced by 50 phr of N326 carbon black (Control) having t5 value 21.6 minutes. Note: t5 value greater than 18 minutes is good for processability.
The present disclosure provides a tyre innerliner NR: SBR: IIR tri-blend based rubber composition reinforced by N326 carbon black 50 phr was replaced with bio carbon black 20 phr (F1) gave hardness value is 63 Shore A against the NR: SBR: IIR triblend tyre inner liner rubber composition C1 reinforced by 50 phr of N326 carbon black (Control) having hardness 62 Shore A.
Further, the present disclosure provides a tyre innerliner NR: SBR: IIR tri-blend based rubber composition (F2, F3, F4) reinforced by bio carbon black 50 phr to 100 phr gave hardness value ranges between 53 to 59 Shore A against the NR: SBR: IIR triblend tyre inner liner rubber composition C1 reinforced by 50 phr of N326 carbon black (Control) having hardness 62 Shore A.
The present disclosure provides a tyre innerliner NR: SBR: IIR tri-blend based rubber composition reinforced by N326 carbon black 50 phr was replaced with bio carbon black 20 phr (F1) gave 16.99% lower oxygen transmission rate (low air permeability) when compared to NR: SBR: IIR triblend tyre inner liner rubber composition C1 reinforced by N326 carbon black (Control).
Further, the present disclosure provides a tyre innerliner NR: SBR: IIR tri-blend based rubber composition reinforced bio carbon black 50 phr to 100 phr (F2, F3, F4) gave 14.49% to 74.34% lower oxygen transmission rate (low air permeability) when compared to NR: SBR: IIR triblend tyre inner liner rubber composition C1 reinforced by N326 carbon black (Control).
Hence, NR: SBR: IIR tri blend based tyre innerliner reinforced by N326 carbon black 50 phr was replaced with bio carbon black 20 phr (F1) provides excellent barrier properties i.e., lower oxygen transmission rate (lower air permeability) when compared to NR: SBR: IIR triblend tyre innerliner rubber composition C1 reinforced by N326 carbon black (Control). Also, the present invention provides a tyre innerliner NR: SBR: IIR tri-blend based rubber composition reinforced by bio carbon black 50 phr to 100 phr (F2, F3 & F4) provides excellent barrier properties along with better processability. The present invention provides tyre innerliner composition having Shore A ranges from 53 to 63 Shore A.
Measurements and Tests:
Better processability (Process Requirements) of a Rubber Compound:
M1. Mooney Scorch Characteristics (pre vulcanization characteristics using large rotor) for processability:
The Mooney Scorch measurements were carried out with a Mooney Viscometer (MV 2000 Alpha technologies, USA) according to ASTM D1646, t5 indicates the time to scorch (MV+5) which indicates the processing properties (process safety).
M2. Hardness of the rubber vulcanizate
Hardness of the Rubber Vulcanizate is measured in accordance with ASTM D 2240.
M3. Barrier Properties of a Rubber Vulcanizate:
Oxygen transmission rate of a rubber vulcanizate is measured in Mocon Make, Model MH 2/21, USA in accordance with ASTM F1927.
The implementation set forth in the foregoing description do not represent all implementations consistent with the subject matter described herein. Instead, they are merely some examples consistent with aspects related to the described subject matter. Although a few variations have been described in detain above, other modifications or additions are possible. In particular, further features and/or variations can be provided in addition to those set forth herein. For example, the implementation described can be directed to various combinations and sub combinations of the disclosed features and/or combinations and sub combinations of the several further features disclosed above. In addition, the logic flows depicted in the accompany figures and/or described herein do not necessarily require the particular order shown, or sequential order, to achieve desirable results. Other implementations may be within the scope of the following claims.

,CLAIMS:1. A tyre innerliner rubber composition comprising:
an elastomeric matrix comprising 100 parts by weight of rubber selected from the group comprising of natural rubber (NR), oil-extended styrene-butadiene rubber (SBR), and butyl rubber (IIR);
bio carbon black as a filler, wherein the carbon weight percentage of the bio carbon black is greater than 75% as measured through SEM EDAX, the bio carbon black having an oil absorption number value ranging from 62 to 73 cc/100 gm and a specific surface area value ranging from 16 to 28 m²/gm, and wherein, the bio carbon black is present in an amount ranging from 20.0 to 120.0 parts by weight per 100 parts by weight of rubber (phr);
process oil present in an amount ranging from 5.0 to 25.0 phr;
antidegradant 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ) present in an amount ranging from 1.0 to 3.0 phr;
accelerator N-tert-butylbenzothiazyl-2-sulfenamide (TBBS) present in an amount ranging from 1.0 to 3.0 phr; and
vulcanizer sulfur present in an amount ranging from 1.0 to 3.0 phr.

2. The tyre innerliner rubber composition as claimed in claim 1, wherein the bio carbon black is manufactured using renewable resources like tree wood (biomass) having high calorific value.

3. The tyre innerliner rubber composition as claimed in claim 1, wherein the hardness of the rubber composition ranges from 53 to 63 Shore A.

4. The tyre innerliner rubber composition as claimed in claim 1, wherein the oxygen transmission rate of the rubber composition is 29.694 to 115.710 cc/m².gm.

5. The tyre inner liner rubber composition as claimed in claim 1, wherein the oxygen transmission rate index is lower than 85.511.

6. A method of preparing a tyre innerliner rubber composition comprising:
mixing bio carbon black with an elastomeric matrix and other ingredients to form a master batch;
adding the master batch to a mixer and mixing with an accelerator and a vulcanization agent to form a final batch; and
sheeting out the final batch.

7. The method as claimed in claim 6, wherein the step 1 of preparing the master batch comprising:
charging a mixing chamber with rubbers and allowing them to mix for 0 to 35 seconds;
adding bio carbon black as a filler, process oil, and rubber chemicals including antidegradant, and allowing them to mix for 110 to 280 seconds;
sweeping in the orifice and allowing the mixture to mix for another 45 to 80 seconds; and
dumping the rubber compound at a temperature in the range of 140°C to 155°C and sheeting it out in a laboratory two-roll mill.

8. The method as claimed in claim 7, wherein the step 2 of preparing the master batch further comprising:
adding the master batch obtained from step 1 to a Lab Banbury Mixer and mixing for 90 to 160 seconds; and
dumping the rubber compound at a temperature of 110 to 140°C and sheeting it out in a laboratory two-roll mill.

9. The method as claimed in claim 6, wherein the step 3 of preparing the final batch comprises:
charging a mixing chamber with the step 2 master batch rubber compound and mixing for 5 to 30 seconds;
adding the accelerator and vulcanization agent and mixing for 60 to 90 seconds; and
dumping the rubber compound at a temperature in the range of 95°C to 115°C and sheeting it out in a laboratory two-roll mill.