Page 60 - 《橡塑技术与装备》英文版2025年12月

HINA R&P TECHNOLOGY AND EQUIPMENT

(a) Softening point; (b) Penetration; (c) Ductility; (d) Elastic recovery
Figure 4 Conventional physical properties of PMA and SMA at different desulfurization speeds
rubber molecular chains to undergo de-crosslinking, forming rotational speed, and desulfurizing agent content increase, the
more soluble molecules and increasing the sol content. The sol content rises and the crosslinking density decreases. Loose
structure and properties of these molecular chains change, and particles in the DCR disappear, the surface becomes sticky and
their elasticity is inferior to that of rubber molecular chains in a develops holes and gaps, and the internal crosslinking network
crosslinked state. After being subjected to external forces, they of the DCR is destroyed.
are difficult to effectively recover to their original state like (2) With the increase of desulfurization temperature and
unsulfurized or low-desulfurized rubber powder, thus reducing rotational speed, the ductility and penetration of crumb rubber
the elastic recovery performance of asphalt. modified asphalt (CMA) increase, but the softening point and
elastic recovery decrease, resulting in improved comprehensive
3 Conclusion performance. Desulfurized rubber is highly environmentally
(1) Using a twin-screw shearing desulfurization process to friendly and economical.
prepare desulfurized rubber, as the desulfurization temperature,

·54· Vol.51，No.12