基于多巴胺的聚氨酯黏合剂的合成与性能

Synthesis and Performance of Polyurethane Adhesives Based on Dopamine

通过化学键将多巴胺引入聚氨酯侧链,制备出一种新型的聚氨酯黏合剂。首先通过四步化学反应制备了一种含多巴胺的新型聚氨酯功能扩链剂-多巴胺二羟甲基丙酰胺(DMPA-DA),然后将此扩链剂与1,4-丁二醇(BDO)按不同的比例,制备出一系列含多巴胺的新型聚氨酯热熔胶。利用FT-IR、1 H-NMR、GPC、UV-Vis和剪切黏结强度性能测试等手段对该新型聚氨酯的结构和黏附性能进行了表征。结果表明:对于基材聚丙烯(PP),剪切黏结强度随着聚氨酯中多巴胺含量的增加而增强,含多巴胺的聚氨酯其剪切黏结强度达到了0.68MPa,比不含多巴胺的聚氨酯增强了160%;对于基材低密度聚乙烯(LDPE)、Al、不锈钢,含多巴胺聚氨酯的剪切黏结强度分别达到2.00、1.70MPa和4.55MPa,比不含多巴胺的聚氨酯均增强了100%以上。

A new-type of dopamine dimethylopropropionic amide（DMPA-DA） was successfully synthe- sized and then reacted with NCO-terminated urethane prepolymer. A series of polyurethane with different contents of dopamine were synthesized by changing the ratio between DMPA-DA and another chain extender 1,4-butanediol. The structure and adhesive performance of the novel polyurethane （PU） was characterized by FT-IR,^1H-NMR,GPC ,UV-Vis and shear strength test. Results showed that the shear adhesive strength was increased in accordance with the contents of dopamine in the PU on the substrate of polypropylene. The shear adhesive strength of PU with dopamine was 0.68 MPa, increased by 160% when compared with PU without dopamine. As for the substrate of LDPE,Al,stainless steel, the shear adhesive strengths of PU with dopamine were 2.00,1.70,4.55 MPa, respectively, increased at least 100% when compared with PU without dopamine.