Acoustic Absorption and Physicomechanical Properties
of SBR/RR Foam
Acoustic Absorption and Physicomechanical Properties
of SBR/RR Foam
Mr. Bashir Algaily
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Introduction
• worldwide increasing use of car as the main of transport.
• Massive stockpiles.• Negative environmental
impact. • RMA reported in 2013.• (50%) waste tires used as
fuel energy.
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Noise pollution???3
Porous material Perforated panels absorber Waste tire rubber material
What is Blowing Agent?
Chemical substance to create foam.
It is called ‘baking powder’ this materials
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Sound absorption mechanisms5Internal Rubber Molecular Chains Processes
Damping losses
Viscous-friction losses
Objectives
The aims of this work to:
develop a new sound absorbing material and evaluate the physic- mechanical properties of SBR/RR foam as well.
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Materials and Chemicals7
SBR
Reclaimed Rubber
Ingredients (phr ) S1 S2 S3
SBR 100 80 60
Reclaimed rubber (RR) 0 20 40
Zinc oxide 4 4 4
Stearic acid 2 2 2
CBS 1 1 1
6PPD 1 1 1
Sodium bicarbonate 10 10 10
Sulfur 1.5 1.5 1.5
Experimental Procedure 8
Left for 24 h at 25˚C
Experimental Methods Mechanical properties
Tensile strength elongation at break.
At room temperature with 50 mm/minute.
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Rubber dumbbell test specimen Tensile machine
Acoustic properties
Standing wave Tube (Kundt’s tube)
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Cross-link density11
Results
Cure characteristics S1 S2 S3
Maximum torque MH (dNm) 3.58 9.83 11:59
Minimum Torque ML (dNm) 1.05 2.27 2.46Curing time t90 (min) 11:52 12:19 14:25
Physicomechanical PropertiesTensile strength (Mpa) 0.667 2.033 3.056
Elongation at break % 203 485 617.5
Cross link density (mole.m-3) 50.45 70.63 81.13
Average apparent density (g.cm-3) 0.643 0.686 0.769
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Table 2. Cure Characteristic and Physicomechanical properties OF foamed SBR/RR
SOUND ABSORPTION 13
Figure 1. Acoustic absorption coefficient of SBR/RR foams for different RR loadings.
S1 0 RR≡S2 20 RR≡S3 40 RR≡
Conclusion
New acoustic absorption material. High acoustic absorption In wider
frequency ranges.
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Thank you for your attention15
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