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The percent free sulfur was lower in the VVO compounds with 1.0 phr ZDMC, 2.0 phr TMTD, 2.0 phr ZDMC and 2.0 phr DPG than the control compound with no acceleration.
All accelerated VVO compounds had equivalent to lower acetone extract than the control compound with no acceleration.
The VVO compounds were mixed into a NR compound to evaluate aging properties and ozone resistance.
The VVO was evaluated at 20 phr or 10% total weight of the mixed rubber compound.
The scorch time was much shorter on the VVO synthesized in the lab (control 3), and decreased when the loading level of accelerator was raised.
Once again, the scorch time and Tc90 are much faster on the VVO synthesized in the lab (table 5, figure 3).
Overall, the addition of VVO increases elongation (figure 5) and lowers 100% modulus (figure 4).
There is a noticeable drop in tensile from the Control 1 compound with no VVO and the Control 2 compound with commercially manufactured 2L Brown VVO (figure 6).
The commercially manufactured 2L Brown VVO has a higher percent change on 100% modulus than the Control 1 compound with no VVO.
The compounds with 1.0 phr ZDMC, 1.0 phr TBBS and 2.0 phr DPG had the same change in durometer that the Control 1 compound has with no VVO. The compounds with 1.0 phr DPG and 2.0 phr TMTD had a lower change in durometer units than the Control 1 compound.
Compound developers often hold the opinion that VVO has a significant influence on the compound hardness and acts as a plasticizer.
In order to extrude EPDM profiles with complex structures and delicate geometry economically, the use of VVO is highly recommended as a processing additive.
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