WO2021260718A1 - Nanocomposite élastomère renforcé d'argile de terre de fuller non modifiée et de noir de carbone et procédé associé - Google Patents

Nanocomposite élastomère renforcé d'argile de terre de fuller non modifiée et de noir de carbone et procédé associé Download PDF

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WO2021260718A1
WO2021260718A1 PCT/IN2021/050431 IN2021050431W WO2021260718A1 WO 2021260718 A1 WO2021260718 A1 WO 2021260718A1 IN 2021050431 W IN2021050431 W IN 2021050431W WO 2021260718 A1 WO2021260718 A1 WO 2021260718A1
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Prior art keywords
rubber
filler composition
phr
elastomeric
elastomeric nanocomposite
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PCT/IN2021/050431
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English (en)
Inventor
Sankaran Kumar
Nair VISHNU RAMACHANDRAN
Kotnees DINESH KUMAR
Kadambanathan THIAGARAJAN
Viswanathan Sivaramakrishnan
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Tvs Srichakra Ltd
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Publication of WO2021260718A1 publication Critical patent/WO2021260718A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0016—Compositions of the tread
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/20—Silicates
    • C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
    • C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
    • C01B33/40—Clays
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/10—Tyres specially adapted for particular applications for motorcycles, scooters or the like
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08J2309/06—Copolymers with styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2315/00—Characterised by the use of rubber derivatives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C08J2323/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
    • C08J2323/22—Copolymers of isobutene; butyl rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2407/00—Characterised by the use of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L15/00—Compositions of rubber derivatives

Definitions

  • the present invention relates to the field of tyres and elastomeric compositions in the field of tyres. More particularly, it relates to un-modified fuller’s earth nanoclay and carbon black reinforced elastomeric nanocomposite.
  • the present invention relates to an elastomeric nanocomposite of excellent wet grip and superior processing characteristics and the process of preparation thereof.
  • US4522970 relates to a pneumatic tire with sulfur cured rubber tread composition containing a medium vinyl polybutadiene rubber and at least one rubber selected from cis 1 ,4-polyisoprene rubber, styrene/butadiene copolymer rubber and cis 1,3 -polybutadiene rubber.
  • the composition also contains both carbon black and clay reinforcement in conjunction with a 3,3'- bis(trimethoxysilylpropyl) polysulfide.
  • US7220794B2 relates to a rubber composition for tire treads which significantly improves the wet skid performance of the tire, which comprises (A) 100 parts by weight of a diene rubber containing at least 35% by weight of styrene-butadiene rubber, (B) 5 to 50 parts by weight of clay, (C) at least 5 parts by weight of silica having a nitrogen absorption specific surface area of 100 to 300 m.sup.2/g and (D) at least 1 parts by weight of carbon black having a nitrogen absorption specific surface area of 70 to 300 m.sup.2/g, wherein, the total amount of (B) clay and (C) silica is at least 30 parts by weight and a total amount of (B) clay, (C) silica and (D) carbon black is at most 100 parts by weight.
  • WO2018118855A1 relates to elastomeric compositions comprising at least one polyindane resin.
  • the elastomeric composition of the invention can comprise one or more fillers.
  • the fillers can comprise any filler that can improve the thermo physical properties of the elastomeric composition (e.g., modulus, strength, and expansion coefficient).
  • the fillers can comprise silica, carbon black, clay, alumina, talc, mica, discontinuous fibers including cellulose fibers and glass fibers, aluminum silicate, aluminum trihydrate, barites, feldspar, nepheline, antimony oxide, calcium carbonate, kaolin, and combinations thereof.
  • the fillers comprise an inorganic and nonpolymeric material
  • the acid-activated clay catalyst may include naturally occurring clay mineral such as kaolinite, bentonite, attapulgite, montmorillonite, clarite, Fuller's earth, hectorite, or beidellite.
  • US20180291181 relates to polar silane linkers that attach to resins to form silane-functionalized resins.
  • the composition comprises one or more fillers, such as, but not limited to, carbon black, calcium carbonate, clay and other silicates, titanium oxide, and zinc oxide.
  • the compositions comprise at least about 10, 20, 30, or about 40 and/or not more than about 90, 80, 70, or about 55 weight percent of at least one filler.
  • the composition comprises one or more fillers, such as, but not limited to, carbon black, calcium carbonate, clay and other silicates, titanium oxide, and zinc oxide.
  • KR100902392 relates to a bead wire coated rubber composition having improved adhesion, and more particularly, to a bead wire coated rubber composition having a lime saturation factor (LSF) of 93 to 95% and a siliceous modulus 2.5 to 2.5%, and Iron Modulus (IM) of 1.4 to 1.7%.
  • the bead wire coating rubber composition further comprises any one 30-95 parts by weight selected from the group consisting of carbon black, syndiotactic- 1,2-polybutadiene, silica, titanium dioxide, clay, layered silicate and tungsten.
  • EP2607098B1 relates to a pneumatic tire with a component containing syndiotactic polybutadiene.
  • the invention particularly relates to a tire with a tread configured with an outer cap rubber layer and an inner or internal underlying rubber layer where the underlying rubber layer comprises such syndiotactic polybutadiene-containing rubber composition.
  • the filler reinforcement comprising at least the carbon black and silica may optionally additionally contain at least one of the platelets of exfoliated clay in an amount of up to 10 phr and the clay (unexfoliated clay) in an amount of up to 40 phr.
  • current invention aims to partially replace the carbon black with naturally available fuller’s earth clay to reduce the production of petroleum originated carbon black and thus helping in reducing the atmospheric pollution and global warming.
  • the present invention aims to provide development of un-modified fuller’s earth nanoclay- carbon black reinforced elastomeric nanocomposite that gives excellent wet grip and superior processing characteristics for the tire tread.
  • an elastomeric nanocomposite reinforced with dual filler composition comprising one or more elastomeric compounds - 100 parts by weight; dual filler composition comprising chemically un-modified Fuller’s Earth (FE) nanoclay -
  • the additives comprises of vulcanization agent - 3 - 10 phr; coupling agent - 1.20 - 3 phr, vulcanization activators - 1.50 - 4.50 phr, anti-degradants - 1- 2 phr, anti-aging additives - 0.5 - 1 phr; cure accelerators - 0.20 - 1.20 phr; and processing aid / oil comprising general TDAE (Treated distilled aromatic extract) grade oils wherein the filler composition for reinforcement comprises chemically unmodified fuller’s earth nanoclay preferably acicular in structure having a length between range 10 and 5000 nanometer with diameter range between 1 and 30 nanometer and carbon black as primary filler.
  • the filler composition for reinforcement comprises chemically unmodified fuller’s earth nanoclay preferably acicular in structure having a length between range 10 and 5000 nanometer with diameter range between 1 and 30 nanometer and carbon black as primary filler.
  • anti-degradants comprises of 6PPD-N-(1,3-Dimethylbutyl)-N’- phenyl-p-phenylenediamine and Microcrystalline wax (MC wax) in a weight ratio of 1 : 1.
  • Preparation of master batch by: mastication of one or more elastomers for 35 - 45 seconds in a mixer; mixing of masticated elastomers with dual filler composition comprising 10 - 70 phr fuller’s earth nanoclay and 30 - 90 phr primary filler carbon black, additives and processing oil; addition of processing aid / oil and mixing for a time period range between 295 - 305 seconds followed by sweeping off the chemicals from the chamber walls and again mixing for a time period of 85 - 95 seconds to yield master batch; and dumping the rubber nanocomposite at 160°C, preparation of final batch by: warming of master batch for 40 - 50 seconds followed by mixing with cure chemicals and accelerators for 115 - 125 seconds; and dumping at a temperature range of 108 - 112 °C.
  • additives comprises of 1.20 - 3 phr coupling agent - Bis(triethoxy silyl propyl) disulphide, 1.50 - 4.50 phr vulcanization activators comprising zinc oxide and stearic acid, 1 - 2 phr anti-degradants comprising 6PPD-N-(1,3- Dimethylbutyl)-N’ -phenyl -p-phenylene diamine and Microcrystalline wax (MS wax), 0.5 - 1 phr anti-aging additive TMQ (2, 2, 4-Trimethyl- 1,2-hydroquinoline) polymer, 3 - 10 phr vulcanization agent sulphur, 0.20 - 1.20 phr cure accelerators comprising N-cyclohexyl-2- benzothiazolesulfenamide and Diphenyl guanidine.
  • additives comprises of 1.20 - 3 phr coupling agent - Bis(triethoxy silyl propyl) disulphide, 1.50 -
  • Figure 1 illustrates the cure time of compounds claiming in present invention (Control, CB/FE- 35/15, CB/FE-25/25, CB/FE-15/15).
  • Figure 2 illustrates the cure time of compounds used as reference in present invention (CB/Si - 35/15, CB/Si - 25/25, CB/Si - 15/15).
  • Figure 3 illustrates the Mooney viscosity of the compounds claiming in present invention (Control, CB/FE -35/15, CB/FE - 25/25, CB/FE -15/15).
  • Figure 4 illustrates the Mooney viscosity of compounds used as reference in present invention (CB/Si -35/15, CB/Si- 25/25, CB/Si - 15/15).
  • Figure 5 illustrates the tan d values of compounds claiming in present invention (Control, CB/FE - 35/15, CB/FE-25/25, CB/FE -15/15).
  • Figure 6 illustrates the tan d values of compounds used as reference in present invention (CB/Si- 35/15, CB/Si-25/25, CB/Si - 15/15).
  • the present invention relates to the field of tyres and elastomeric compositions capable of providing products with excellent wet grip and superior processing characteristics.
  • an elastomeric nanocomposite composition comprising of reinforcing dual filler composition comprising of chemically un modified fuller’s earth nanoclay and primary filler -carbon black.
  • the developed nanocomposite has good processing characteristics (lower mooney viscosity) as compared with conventional carbon black-silica based dual filler composition. It thereby reduces the tear and wear of the process equipment viz rubber mixer, tread extruder, etc.
  • an elastomeric nanocomposite composition also containing elastomeric compounds selected from one or more of natural rubber, epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), hydrogenated natural rubber, styrene butadiene rubber (SBR), modified styrene butadiene rubber, butadiene rubber (BR), modified butadiene rubber, chlorosulfonated polyethylene rubber, epichlorohydrin rubber, fluorine rubber, nitrile rubber, hydrogenated nitrile rubber, nitrile butadiene rubber (NBR), modified nitrile butadiene rubber, chlorinated polyethylene rubber, styrene ethylene butylenes styrene (SEBS) rubber, ethylene propylene rubber, ethylene propylenediene (EPDM) rubber, Hypalon rubber, chloroprene rubber, ethylene vinylacetate rubber, acrylic rubber, hydrin rubber, vinyl benzyl chloride
  • an elastomeric nanocomposite composition which consists of elastomer(s) 100 by weight, fuller’s earth nanoclay preferably acicular in structure having a length of 10 nm to 5000 nm and without any organic modification 10 - 70 parts by weight, carbon black 30 - 90 parts by weight and a rubber composition consisting of conventional additives and mixing procedure thereof.
  • An elastomeric nanocomposite composition which can be used to produce products with excellent wet grip and with superior processing characteristics, consists of 100 parts by weight of elastomeric compounds, comprising 60 parts by weight of solution polymerized styrene -butadiene rubber terminally di-fuctionalized with an alkoxysilane group and a primary amine group, 20 parts by weight of polybutadiene rubber or simply butadiene rubber having 96% cis-1,4 configuration and mooney viscosity 45 ML(l+4) @ 100°C, and 20 parts by weight of natural rubber having mooney viscosity 78ML(l+4)@ 100°C; a dual filler composition comprising of 10 - 70 parts by weight of fuller’s earth nanoclay and 30 - 90 parts by weight of carbon black.
  • Preferred embodiments may comprise of any grades of solution polymerized styrene butadiene rubber (S SBR).
  • the elastomeric nanocomposite also consists of 3 - 10 phr of vulcanization agent as Sulphur, coupling agent as Bis(triethoxy silylpropyl)disulphide - 1.20 - 3 phr; vulcanization activators - 1.50 - 4.50 phr comprising zinc oxide and stearic acid preferably in a weight ratio of 3:1.50; anti-degradants 1-2 phr comprising 6PPD - N-(l,3-dimethylbutyl)-N’-phenyl-p-phenylenediamine and microcrystalline wax (MC wax); anti-aging additives as TMQ (2,2,4-Trimethyl- 1,2-hydroquinoline) polymer 0.5 - 1 phr ; cure accelerators 0.20 - 1.20 phr comprising N-cyclohexyl-2-benzothi azolesulfenamide and diphenyl guanidine preferably
  • An embodiment of the present invention discloses a method of preparation of an elastomeric nanocomposite comprising of dual filler composition comprising a chemically un-modified fuller’s earth nanoclay and primary filler as carbon black.
  • the steps comprises of:
  • the process can be carried out using one of plasticoder, intermix, banbury, two-roll mill and the like.
  • the ingredients are initially mixed in an internal mixture.
  • the rotor speed is maintained constantly around 43 - 47 rpm.
  • the temperature of rotor of the internal mixer is maintained around 53 - 57 °C and the temperature of the chamber of the internal mixer is maintained around 48 - 52°C.
  • the ram 2 pressure is kept to 4.95 - 5.05 kp/cm .
  • the batch weight is decided based in the chamber volume of the mixer.
  • the fill factor of the chamber is 0.88 - 0.92.
  • the total mixing time of the master batch compound is around 7 minutes.
  • Rubber is initially masticated for 35 - 45 minutes.
  • the rubber chemicals, unmodified fuller’s earth nanoclay and processing oil / aid is added to the masticated rubber. Further, the chemicals are added in the following order: cure activators, anti-degradants.
  • the initial addition of fuller’s earth nanoclay helps in the fine dispersion of the nano material into the rubber matrix. This mixing process is carried out for295 - 305 seconds. This is followed by sweeping off the chemicals from the chamber walls and again the mixing is continued up to 85 - 95 seconds. Finally, the mixed rubber nanocomposite is dumped. The dump temperature of the rubber nanocomposite is 160°C.
  • the rubber chemicals are coupling agent Bis(triethoxysilylpropyl)disulphide, vulcanization activators as zinc oxide and stearic acid, anti-degradants as 6PPD -N-(1,3-Dimethylbutyl)-N’- phenyl-p-phenylenediamine and Microcrystalline wax, anti-aging additive as TMQ (2,2,4- Trimethyl- 1 ,2-hydroquinoline)polymer, vulcanization agent sulphur, cure accelerators as N- cyclohexyl-2-benzothiazolesulfenamide and Diphenyl guanidine and dual filler composition comprising unmodified fuller’s earth nanoclay and primary filler as carbon black.
  • TMQ 2,2,4- Trimethyl- 1 ,2-hydroquinoline
  • Rotor speed is maintained at 28 - 32 rpm and the starting temperature of mixing is 38 - 42°C.
  • the ram pressure is kept to 5 kp/cm .
  • the master batch is warmed for 40 - 50 seconds.
  • the cure chemical and accelerator were added further and mixed for 115 - 125 seconds.
  • the dump temperature is kept at 108 - 112 °C.
  • the main parameters which decide the ease of processing of an elastomeric composite are viscosity and curing of the respective composites. If the mooney viscosity of a compound is high, for processing that compound, one needs to apply more shear force which leads to more power usage and ultimately cost of production also get increases. Similarly, the cure time is the time required to keep the elastomeric composite under prescribed cure temperature and pressure for getting cross- linked with the added curatives. If the cure time is high for an elastomeric composite, the time required for producing a product using that composite will also increase which will lead to low production output.
  • Example 1 Example 1:
  • a set of four (4) compounds is designed as shown in Table 1.
  • the control compound is designed in such a way that there is no filler is used to reinforce the Solution Polymerized Styrene -butadiene rubber (SSBR)/ Butadiene Rubber (BR)/ Natural rubber (NR) Tri-blend.
  • SSBR Solution Polymerized Styrene -butadiene rubber
  • BR Butadiene Rubber
  • NR Natural rubber
  • the present invention discloses a set of compound formulations in which a dual filler system of carbon black and FE nano-clay is used to reinforce a tri-blend system of rubbers, the said rubbers are a) Solution polymerized styrene-butadiene rubber terminally di-functionalized with an alkoxysilane group and a primary amine group b) Indian standard natural rubber grade 20 c) Polybutadiene Rubber or simply Butadiene Rubber
  • the cure behaviour of all the compounds has been measured in accordance with the ASTM standard D 1646-04 at 160°C using an Oscillating disc rheometer (model :EKT-100H, Ektron Tek Co. Ltd.Taiwan ).
  • the control compound has recorded a curing time of 10 minutes 18 seconds at 160°C.
  • the compound CB/FE-25/25 has shown a cure time of 7 - 9 minutes (i.e. appropriately 8 minutes 54 seconds) at 160°C as shown in Figure 1 and Table 3, while the conventional compound CB/Si-25/25 is having a cure time of 13 minutes 36 seconds at 160°C as shown in Figure 2, Table 4.
  • the compounds according to the present invention are showing lower cure time as compared to the reference compounds ( Figure 2) (Table 4).
  • the Mooney viscosity of the compounds was measured in accordance with the ASTM standard D 1646-04 at 125°C using a Mooney viscometer (model: Mooney MV-2000, Alpha Technologies, Ohio, USA).
  • the Mooney viscosity values are expressed as X ML(l+4) at 125°C where X is the Mooney viscosity values, M indicates that the unit is in Mooney scale, L stands for the rotor size, L is for large rotor, 1 is the rotor pre -heating time in minutes, 4 is the test duration in minutes and 125°C is the test temperature.
  • the control compound has recorded a mooney viscosity of 30 ML(l+4) at 125°C, which is the base Mooney viscosity value for the SSBR/BR/NR tri blend without any reinforcements.
  • CB/FE-35/15 has Mooney viscosity 69.1 ML(l+4) at 125°C ( Figure 3., Table 3.)
  • CB/Si-35/15 were the corresponding reference compound has 81ML(l+4) at 125°C ( Figure 4, Table 4).
  • the FE based compounds offer processing benefits over the conventional compounds.
  • Mooney viscosity and the cure time are the parameter which decides the ease of processing of an elastomeric compound. Since the present invention offers a lower mooney viscosity and cure time than the reference compounds it exhibits better processing characteristics than the reference compounds.
  • the scorch time is another major processing parameter for rubber vulcanisates which determines the extent of safe processing before the vulcanization of the compound.
  • the present invention offers a minimum scorch time of atleast 25 minutes and 37 seconds for CB/FE-35/15 and a maximum of 31 minutes for the CB/FE-15/35 at 125°C which is sufficient for shaping complex articles such as tires.
  • the dynamic mechanical analysis of the compounds has been done in temperature sweep mode from -100°C to +60°C at 20Hz frequency with a dynamic strain of 0.1% using a dynamic mechanical analyzer (DMA) (model: DMA+1000, Metravib, Limonest, France) to obtain the tan d values at 0°C.
  • DMA dynamic mechanical analyzer
  • the tan d value at 0°C is conventionally taken as an authentic measure for predicting the wet grip of the tyre tread compound.
  • the CB/FE-25/25 shown a tan d value at 0°C of 0.581 in Figure 5, Table 5.
  • the conventional reference compound CB/Si-25/25 is showing only 0.568 ( Figure 6, Table 6) which implicates that the compound CB/FE-25/25 offers good wet grip than the reference compound (CB/Si-25/25).
  • the wet grip of the unmodified fuller’s earth nanoclay - carbon black reinforced elastomeric compound is better than the conventional carbon black filled elastomeric composites. 2.
  • the resultant elastomeric composite it can be effectively employed in the motor cycle tire tread having excellent wet grip.

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  • Health & Medical Sciences (AREA)
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Abstract

La présente invention se rapporte à un nanocomposite élastomère pour bande de roulement de pneumatique conférant une excellente adhérence sur sol mouillé et des caractéristiques de traitement supérieures. Le nanocomposite élastomère ayant une composition de charge double renforcée comprend 100 en poids d'élastomère(s), de 10 à 70 parties en poids d'argile de terre de fuller de préférence aciculaire dans une structure ayant une longueur comprise entre 10 nm et 5 000 nm et sans modification organique, de 30 à 90 parties en poids de noir de carbone et une composition de caoutchouc constituée d'additifs classiques. La présente invention se rapporte en outre à un procédé de préparation de nanocomposite élastomère.
PCT/IN2021/050431 2020-06-24 2021-05-04 Nanocomposite élastomère renforcé d'argile de terre de fuller non modifiée et de noir de carbone et procédé associé WO2021260718A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030181562A1 (en) * 2000-09-15 2003-09-25 Laure Belin Rubber composition for a tire comprising a citraconimido-alkoxysilane as coupling agent
US6818693B2 (en) * 2000-11-29 2004-11-16 Continental Aktiengesellschaft Rubber compound for tire tread rubber
US20130261242A1 (en) * 2010-10-01 2013-10-03 Bridgestone Corporation Method for manufacturing rubber composition
EP2719549A1 (fr) * 2012-10-12 2014-04-16 The Goodyear Tire & Rubber Company Polymère fonctionnalisé, composition de caoutchouc et pneu

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030181562A1 (en) * 2000-09-15 2003-09-25 Laure Belin Rubber composition for a tire comprising a citraconimido-alkoxysilane as coupling agent
US6818693B2 (en) * 2000-11-29 2004-11-16 Continental Aktiengesellschaft Rubber compound for tire tread rubber
US20130261242A1 (en) * 2010-10-01 2013-10-03 Bridgestone Corporation Method for manufacturing rubber composition
EP2719549A1 (fr) * 2012-10-12 2014-04-16 The Goodyear Tire & Rubber Company Polymère fonctionnalisé, composition de caoutchouc et pneu

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