� Kuraray Liquid Rubber 9
Silane-modified GS-L-BR
Features � Improves silica dispersion � Crosslinkable with rubber base � High reactivity with silica � Improves silica-polymer interaction � Lower silica-silica interaction
Silane coupling agents are used in silica-filled rubber compounds to increase filler-polymer interactions and lower the filler-filler interactions. In addition, silane functionalized low molecular weight ‘liquid’ polymers can be used. Our silane-modified GS-L-BR is one of the latest development of functionalized liquid rubber grades.
What is the function of GS-L-BR in rubber compounds?
Crosslink
Solid rubber
Expectation � Good silica dispersion � Improved abrasion resistance � Low tan δ
Silica
GS-L-BR
enhanced fuel economy
Vulcanization
Formulation & mixing conditions
Control
Formulation
Mixing Conditions
NP1
Banbury-type mixer
S-SBR
80
80
0'00" 0'20" 5'30"
Solid rubber (60˚C)
BR
20
20
Filler, SCA, Oil, LR, AO, ZnO, Stearic acid
TDAE
40
30
Dump out (150-160˚C)
Kuraray liquid rubber
-
10
NP2
Banbury-type mixer
Silica
100
100
0'00" 4'30"
First mixed compound (90˚C)
SCA (Si-75)
8.0
8.0
Dump out (150-160˚C)
ZnO
3.0
3.0
FM
Banbury-type mixer
Stearic Acid
2.5
2.5
0'00" 0'75"
Compound, S, Accelerator (50˚C)
Anti oxidant 6C
2.5
2.5
Dump out (90-100˚C)
Wax
2.0
2.0
OT-20
1.9
1.9
Accelerator DPG
0.5
0.5
Summary Feature of GS-L-BR-114 � Better rolling resistance and silica dispersion than L-BR � Better abrasion
Accelerator CBS
3.5
3.5
Accelerator TBTD
1.5
1.5
Abrasion resistance
Structure & typical properties of GS-L-BR
120
GS-L-BR-114 TDAE (control)
Tg (˚C)
Number of functional group / chain
Structure
Mw
Development code
100
and wet grip performance
Graft functionalized
GS-L-BR-114*
6,000 -50
2
80
Non-functionalized
Rolling resistance @60˚C
Wet grip
5,500 -49
none
L-BR
60
*Only for the research purpose.
GS-L-BR is superior in terms of well-balanced properties.
Silica dispersion
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