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Tensile Strength

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Tensile Strength
INCORPORATION OF DEVULCANIZED RUBBER INTO A VIRGIN TIRE TREAD RUBBER COMPOUND
Mohammad Meysami, Shuihan Zhu, and Costas Tzoganakis
Department Of Chemical Engineering, University of Waterloo
Waterloo, Ontario, Canada
Elongation at break

Characterization

•Devulcanization of waste rubber with scCO2 in an extruder is an environmentally friendly continuous process;
•A reasonably high throughput of devulcanized rubber has been obtained in the devulcanization process in a twin screw extruder, which was stable
•Devulcanized rubber obtained from the devulcanization process can be re-vulcanized again by adding proper amount of curing chemicals
• To incorporate the devulcanized rubber into a virgin tire compound for material cost- reduction ;
•To study the impact of devulcanized rubber utilization on tire compound performance ;

•Mooney viscosity
•Curing characterizations
•Tensile properties ( Tensile strength, Elongation at break) •Hardness
•Hysteresis (heat build up)
•Cut and chip (% of mass loss)

20
12

Objectives

120

Mooney Viscosity

Devulcanization

Valve

Feeder
CO2
Cylinder

50 rpm
200 C

Syringe Pump
Thermocouples

35
30
25
20
15
10

0

10

20

30

40

85.5%
80
60
40
20

Pressure
Transducers

Extruder

Die

Curing characterizations

10

20

30

40

Hardness
70
65

62

63

63

62

0

10

20

30

60
55
50
45
40
35
30

Devulcanized rubber content in virgin tire compound (%)

Gear box 80.4%

Devulcanized rubber content in virgin tire compound (%)

Hardness (shore A)

Valve

Mooney viscosity (ML(1+4))

Sc Co2 injection system

94.7%

100

0

45
40

100%

0

50

Twin screw extrusion, CO2 injection, and data acquisition
Control Panel

Retention of Elongation at break
(%)

Background

Devulcanized rubber content in virgin tire compound (%)

Hysteresis
Hysteresis

1.4

30

Recipe for sample preparation
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