JSR AT series for Tire applications

Transcription

1 JSR AT series for Tire applications JSR Corporation Petrochemical Products Div. Thermoplastic Elastomer Dept. This information contained herein is given in good faith but without any guarantee or warranty and involve proprietary rights of third parties. Our advice given in this information does not release you from the obligation to check its validity and to test our products as to their suitability for the intended process and uses. The application, use and processing of our products manufactured by you on the basis of our technical advice are beyond our control and, therefore, entirely on your own responsibility. Our products are sold only in accordance with Product Specification separately issued by us. 1

2 JSR AT (Syndiotactic 1,2-Polybutadiene) JSR AT is Syndiotactic 1,2 Polybutadiene (JSR AT) for Tire applications. Melting point exists due to crystalline nature of Syndiotactic structure. JSR AT is the rubber with high hardness & low viscosity. Grade AT300 AT400 Form Pellet Pellet Packing 25kgs Bag 25kgs Bag Structure 1,2-Butadiene microstructure (%) Crystallinity (%) Non-Cure Properties Density (mg/m 3 ) Melting point ( ) MFR ( N) (g/10min) Cure Properties * ML1+4 (120 C) ML1+4 (130 C) Hardness (Duro A) M100 (MPa) M300 (MPa) Strength at break (MPa) Elongation at break (%) *:Recipe;Polymer/ZnO/Stearic acid/acc.dm ** /Acc.TET ** /S=100/3/2/1.5/0.66/1.6phr *Acc.DM ; Dibenzothiazyldisulfide *Acc.TET ; Tetra ethylthiuramdisulfide 2

3 JSR AT series for Tire applications Component Tread Base tread (Belt) Bead Carcass Side wall Base polymer S-SBR/BR NR/E-SBR NR/Phenol NR BR/NR Processability Low Viscosity Decrease of consumption energy - High green strength Small mill shrinkage of sheet - - Driving stability High-Hardness High-elastic shear modulus (G ) - Rolling Resistance Physical properties Low 50 tanδ (by using Soft Carbon Black) Better Rolling Resistance (by decreasing content of Carbon Black) Better Modulus(M300) - Better Tensile strength Better Tear strength - - Durability Better crack growth - - Better Heat Resistance - - JSR AT is suitable for various tire applications. 3

4 Recipe ; Effect of JSR AT for NR compound Run No. Ref NR(RSS#3) AT AT N330(HAF) OIL(T-DAE) Stearic acid/zno/6c *1 /CZ *2 /S = 2.0/5.0/1.0/1.0/4.0 Mixing Procedure ; Mixer ; 250cc Laboratory-plastomill *1;N-(1,3-Dimethyl-butyl)-N -phenyl-p-phenylendiamine *2;N-Cyclohexyl-2-benzothiazyl-sulfenamide(CBS) Tim (min) Ingredients Circulating Oil Temp. Rotor Speed Stage Polymer (NR) AT300orAT400,CB ZnO, Stearic Acid, 6C, Oil Clean up Damp at about 130 o C 100 o C 60rpm Stage Batch from Stage 1 Accelerator, Sulfur Damp at about 100 o C 70 o C 60rpm 4

5 Physical properties of unvulcanized rubber I. Viscosity & Properties of flow II. Extrusion test III.Green strength & Shrinkage ratio 5

6 I. Viscosity & Properties of flow Comp'd ML1+4 (125 ) Flow rate Flow rate test conditions 1)Set temp;130 2)Die size;2mm 2mmφ 3)Load;60kgf Addition of AT decreases compound viscosity and increases flow rate. 6

7 II. Extrusion test Extruder Conditions 1)Cylinder & Die temp ; 100 2)Die type ; Garvey die 3)Screw rotation ; 20rpm Run No. Ref-1 NR only 1 AT300 2 AT400 Die swell 182% 155% 149% Edge Poor Good Surface Poor Good Sample Addition of AT improves extrudability. Especially, compound with At400 shows excellent extrudability. 7

8 III. Green strength & Shrinkage ratio Green strength Shrinkage ratio Shrinkage test conditions 1)Roll temp;60 2)times;1minute 3)Measurement time;2 hours after Addition of AT increases green strength and decreases mill shrinkage. JSR AT can improve the processability. 8

9 Physical properties of vulcanized rubber i. Hardness & Elastic modulus ii. Vulcanized adhesion to steel cord iii. Vulcanized adhesion to Tread and Carcass iv. Durability(Heat resistance) 9

10 i. Hardness & Elastic modulus Hardness [Duro-A] Elastic modulus at 3% G *Test mode ; Strain Dependence Temp=50 Frequency=100rad/sec Addition of AT provides high Hardness and high Elastic modulus. 10

11 ii. Vulcanized adhesion to steel cord Test Method Steel cord : Brass plated cord Size : φ0.25mm 4 Cure Condition : min Test speed : 50mm/min Strength to pull out [Unit : N] Run No. Ref-1 NR only Steel cord Tension 1 AT mm Φ4mm Compound 2 AT400 Original Heat cycle test 50times Heat cycle test 100times Amount of remaining rubber [INDEX] Run No. Ref-1 NR only 1 AT300 2 AT400 Original Heat cycle test 50times Heat cycle test 100times Heat cycle test 1cycle : 0 Temperature rise at 5 /min 30min Hold at 100 Temperature drop at 5 /min 30min Hold at 0 Addition of AT can improve the vulcanized adhesion to steel cord. 11

12 iii. Vulcanized adhesion to Tread and Carcass Test Method Cure Condition : min Test speed : 50mm/min Tension 15mm 4mm Tension Peel Strength [Unit : N/15mm] Run No. Ref-1 NR only 1 AT300 2 AT400 Tread Carcass Tread;HP355R/BR01/1165MP/Si75/N339/OIL/Stearic acid/zno/6c/dpg/cz/s=80/20/65/5.2/5/10/2/3/1/1.5/1.8/1.5 Carcass ; NR(RSS#3)/N330/OIL/Stearic acid/zno/6c/cz/s=100/50/10/1/5/1/1/4 Vulcanized adhesion of compound with AT is as same as NR compound. 12

13 iv. Durability(Heat resistance) *Test condition ; Temp=100 aging Tensile strength Hardness[Duro-A] Addition of AT provides good durability. JSR AT can improve the physical properties of NR compound. 13

14 Summary Adding AT to NR compound can improve following properties. Decreases compound viscosity and increases flow rate. extrudability. Increases green strength and decreases mill shrinkage. High hardness and High Elastic modulus. High vulcanized adhesion to steel cord. Good durability. NR compound with AT can improve following Tire properties. Processability(low compound viscosity) Driving stability(high hardness and modulus) High adhesive property of steel cord 14 Durability(Good Heat resistance)