Bio-based cross-linked recyclable polyurethane composite material and preparation method thereof

The invention discloses a bio-based cross-linked recyclable polyurethane composite material and a preparation method thereof. The bio-based cross-linked recyclable polyurethane composite material is prepared from a polyurethane prepolymer containing a diene structure and a bio-based modified polyester cross-linking agent. The polyurethane material is cured through a diene addition reaction, a forward-reversible reaction of a chemical bond is achieved through temperature stimulation, flowing and non-curing at 110-130 DEG C are achieved, curing is achieved at 60-70 DEG C, and the polyurethane material can be recycled after being heated. 本发明公开了一种生物基交联可回收聚氨酯组合料及其制备方法，所述生物基交联可回收聚氨酯组合料包括：含有双烯烃结构的聚氨酯预聚体，和一种生物基改性聚酯交联剂，本发明的聚氨酯材料是通过双烯加成反应实现固化，并通过温度刺激实现化合键的正向-可逆反应，实现110-130℃可流动不固化，在60-70℃固化，加热可回收再利用。