Abstract
The influences of quantities and addition sequences of extra sulfur into silicafilled NR compounds, with bis-(triethoxysilylpropyl) disulfide (TESPD) as coupling agent, on the properties are investigated in comparison with the compound with bis(triethoxysilylpropyl) tetrasulfide (TESPT) as reference. The addition of extra sulfur during mixing of TESPD-silica-NR in the internal mixer significantly changes the overall properties of the materials. On the other hand, compounds with extra sulfur added on a cold two-roll mill show no significant changes. Extra sulfur at approximately 0.15 - 0.20 phr, or 3.4 - 5.1 wt% relative to the TESPD content is an optimal amount to achieve better scorch safety of the compounds, as well as comparable properties of the vulcanizates, compared with those based on TESPT as coupling agent without extra sulfur.
| Original language | English |
|---|---|
| Pages (from-to) | 33-39 |
| Number of pages | 7 |
| Journal | KGK Kautschuk Gummi Kunststoffe |
| Volume | 67 |
| Issue number | 5 |
| Publication status | Published - May 2014 |
Keywords
- NLA
- Natural rubber
- Reinforcement
- Silane
- Silica
- Coupling agents