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Grds conferences icst and icbelsh (2)

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This presentation was done in June 2014 by one of our participants in ICST and ICBELSH conferences.

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Grds conferences icst and icbelsh (2)

  1. 1. Acoustic Absorption and Physicomechanical Properties of SBR/RR Foam Acoustic Absorption and Physicomechanical Properties of SBR/RR Foam Mr. Bashir Algaily 1
  2. 2. 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. 2
  3. 3. Noise pollution??? 3 Porous material Perforated panels absorber Waste tire rubber material
  4. 4. What is Blowing Agent?  Chemical substance to create foam.  It is called ‘baking powder’ this materials 4
  5. 5. Sound absorption mechanisms5 Internal Rubber Molecular Chains Processes Damping losses Viscous-friction losses
  6. 6. 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. 6
  7. 7. 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
  8. 8. Experimental Procedure 8 Left for 24 h at 25˚C
  9. 9. Experimental Methods Mechanical properties  Tensile strength elongation at break.  At room temperature with 50 mm/minute. 9 Rubber dumbbell test specimen Tensile machine
  10. 10. Acoustic properties  Standing wave Tube (Kundt’s tube) 10
  11. 11. Cross-link density11
  12. 12. Results Cure characteristics S1 S2 S3 Maximum torque MH (dNm) 3.58 9.83 11:59 Minimum Torque ML (dNm) 1.05 2.27 2.46 Curing time t90 (min) 11:52 12:19 14:25 Physicomechanical Properties Tensile 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 12 Table 2. Cure Characteristic and Physicomechanical properties OF foamed SBR/RR
  13. 13. SOUND ABSORPTION13 Figure 1. Acoustic absorption coefficient of SBR/RR foams for different RR loadings. S1 0 RR≡ S2 20 RR≡ S3 40 RR≡
  14. 14. Conclusion  New acoustic absorption material.  High acoustic absorption In wider frequency ranges. 14
  15. 15. Thank you for your attention 15

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