Page 10 - 《橡塑技术与装备》英文版2025年12月

HINA RUBBER/PLASTIC TECHNOLOGY AND EQUIPMENT

-1
vibration absorption peak at 1712.31 cm is the stretching
vibration of -C=O, and the stretching vibration peak
-1
at 1264.21 cm is the stretching vibration of C-O on
the hydroxyl group of the bonding alcohol, indicating
the degradation of solid-phase PET. The ester bond of
the polyester chain is replaced by the hydroxyl group of
ethylene glycol to generate small molecule PHET that can
be dissolved in ethylene glycol.

4 Conclusion
A a kind of of catalyst for ethylene glycol
depolymerization of PET with silanol salt was synthesized,
Figure 6 Infrared spectrum of silanol salt catalyst
and its optimal alcoholysis process parameters were
investigated.Compared with other catalysts, the conversion depolymerization monomers, and improve the quality of
rate is higher, the catalytic effect is obvious, and it is regenerated products.The treatment of recalcitrant PET
safe and non-toxic. It can avoid the adverse effects of plastics provides a new direction that is more in line with
residual traditional alcoholysis catalysts on regeneration the concept of green chemistry.
polymerization, help simplify the purification of

·4· Vol.51，No.12