JSR AT series for Tire applications

JSR Confidential
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.
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JSR Confidential
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
(%)
93
94
Crystallinity
(%)
29
36
(mg/m3)
0.909
0.914
(℃)
105
126
(g/10min)
3.0
9.0
ML1+4 (120ﾟC)
15.3
-
ML1+4 (130ﾟC)
-
24.2
(Duro A)
91
94
M100
(MPa)
6.7
9.9
M300
(MPa)
13.5
17.1
Strength at break
(MPa)
15.3
21.2
(%)
320
330
Non-Cure Properties
Density
Melting point
MFR （150℃、21.2N）
Cure Properties*
Hardness
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
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JSR Confidential
JSR AT series for Tire applications
Tread
Base tread
（Belt）
Bead
Carcass
Side wall
S-SBR/BR
NR/E-SBR
NR/Phenol
NR
BR/NR
Low Viscosity
◎
◎
◎
◎
◎
Decrease of consumption energy
◎
◎
-
◎
◎
High green strength
◎
◎
◎
◎
◎
Small mill shrinkage of sheet
-
◎
-
◎
◎
High-Hardness
◎
◎
◎
◎
◎
High-elastic shear modulus (G’)
◎
◎
-
◎
◎
-
◎
-
◎
-
-
◎
-
◎
-
Better Modulus(M300)
◎
◎
◎
-
◎
Better Tensile strength
-
-
◎
-
-
Better Tear strength
-
◎
◎
-
◎
Better crack growth
-
◎
-
◎
◎
Better Heat Resistance
-
◎
◎
◎
-
Component
Base polymer
Processability
Driving stability
Rolling Resistance
Low 50℃ tanδ
(by using Soft Carbon Black)
Better Rolling Resistance
(by decreasing content of Carbon Black)
Physical
properties
Durability
JSR AT is suitable for various tire applications.
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JSR Confidential
Effect of JSR AT for NR compound
Recipe ;
Run No.
Ref-1
1
2
100
80
80
AT300
-
20
-
AT400
-
-
20
N330（HAF）
50
50
50
OIL（T-DAE）
10
10
10
NR（RSS#3）
Stearic acid/ZnO/6C*1/CZ*2/S = 2.0/5.0/1.0/1.0/4.0
*1；N-(1,3-Dimethyl-butyl)-N’-phenyl-p-phenylendiamine
*2；N-Cyclohexyl-2-benzothiazyl-sulfenamide(CBS)
Mixing Procedure ;
Mixer ; 250cc Laboratory-plastomill
Stage 1
Tim (min)
Ingredients
Circulating Oil Temp.
Rotor Speed
0.0
0.5
Polymer (NR)
AT300orAT400,CB
ZnO, Stearic Acid, 6C, Oil
Clean up
Damp at about 130oC
100oC
60rpm
Batch from Stage 1
Accelerator, Sulfur
Damp at about 100oC
70oC
60rpm
2.5
3.5
Stage 2
0.0
1.5
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Physical properties of unvulcanized rubber
I. Viscosity & Properties of flow
II. Extrusion test
III.Green strength & Shrinkage ratio
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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
Excellent
Excellent
JSR Confidential
Addition of AT decreases compound viscosity and increases flow rate.
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JSR Confidential
II. Extrusion test
〔Extruder Conditions〕
1)Cylinder & Die temp ; 100℃
2)Die type ; Garvey die
3)Screw rotation ; 20rpm
Ref-1
NR only
1
AT300
2
AT400
182%
155%
149%
Edge
Poor
Good
Excellent
Surface
Poor
Good
Excellent
Run No.
Die swell
Sample
Addition of AT improves extrudability.
Especially, compound with At400 shows excellent extrudability.
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JSR Confidential
III. Green strength & Shrinkage ratio
Green strength
Excellent
Excellent
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.
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JSR Confidential
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)
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i. Hardness & Elastic modulus
Hardness [Duro-A]
Excellent
Elastic modulus at 3% G’
Excellent
JSR Confidential
*Test mode ; Strain Dependence
Temp=50℃
Frequency=100rad/sec
Addition of AT provides high Hardness and high Elastic modulus.
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JSR Confidential
ii. Vulcanized adhesion to steel cord
【Test Method】
・Steel cord : Brass plated cord Size : φ0.25mm×4
・Cure Condition : 160℃×10min
Steel cord
・Test speed : 50mm/min
←
650mm
→
↑
Tension
Compound
Φ4mm
↓
Strength to pull out [Unit : N]
Ref-1
NR only
1
AT300
2
AT400
Original
140
180
180
Heat cycle test 50times
160
170
190
Heat cycle test 100times
130
160
160
Run No.
Ref-1
NR only
1
AT300
2
AT400
Original
100
125
120
Heat cycle test 50times
105
115
120
80
105
120
Run No.
Amount of remaining rubber [INDEX]
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
JSR Confidential
iii. Vulcanized adhesion to Tread and Carcass
Tension
15mm
4mm
Tension
【Test Method】
・Cure Condition : 160℃×10min
・Test speed : 50mm/min
Peel Strength [Unit : N/15ｍｍ]
Ref-1
NR only
1
AT300
2
AT400
Tread
120
140
130
Carcass
240
230
270
Run No.
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.
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JSR Confidential
iv. Durability(Heat resistance)
*Test condition ; Temp=100℃ aging
Tensile strength
Excellent
Hardness[Duro-A]
Excellent
Addition of AT provides good durability.
⇒ JSR AT can improve the physical
properties of NR compound.13
JSR Confidential
Summary
★Adding AT to NR compound can improve following properties.
Decreases compound viscosity and increases flow rate.
Excellent 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
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Durability（Good Heat resistance）