This paper is targeting towards studying on the possibility to modify some properties
of unsaturated Polyester compounds by adding rubber materials in order to improve its
flexibility property. For this target, Waste of cars' tires was used in two
forms powder and
pieces, and the liquid rubber Styrene-butadiene was used as another type of rubber. After
that the modification was detected by measuring the possibility of the resulted compound
materials to absorb vibration power, and reduce the noise that is produced by eccentric
crankshaft circulation at different rotating speeds, (300, 500, 700) rpm.
Test results demonstrate that there will be Modification in the construction of the
compounds at low rotating speeds (300 rpm). On the other hand, it demonstrates different
results at high rotating speeds.
In this research study the effect of adding thermal cement as a filler on the properties
of natural rubber STR20, through the preparation of natural rubber mixtures containing
different ratios of thermal cement (0,5,10,15,20 pphr) on the rolling ru
bber machine, then
characterization physico-mechanical properties and chemical of mixtures that prepared
and then tested to measure the tensile strength, resistance friction and determine the
hardness and swelling values in different solvents.
The results showed increased tensile strength with increased thermal cement ratio
until
15( pphr) but after this percentage take tensile strength to decline gradually, where
the relationship becomes counterproductive between the additives and the resistance ratio,
as noted the low percentage of elongation at break gradually with increasing the proportion
of thermal cement, as for the hardness values it has increased in extrusive with increase
the proportion of thermal cement in mixtures, also observed a decrease in friction
resistance with increase the additives proportion even (15 pphr) to rise after that.
Results of the study also showed that the samples swelling in mineral oil was lower
compared to all of the gasoline and diesel, the swelling was in the mineral oil 1.29%, while
in gasoline was 14.15% and in diesel was 12.43%.
