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Acoustic Absorption and Physicomechanical Properties

of SBR/RR Foam

Acoustic Absorption and Physicomechanical Properties

of SBR/RR Foam

Mr. Bashir Algaily

1

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