己二酸系聚酯型水性聚氨酯胶黏剂的制备及性能研究

Synthesis and properties of waterborne polyurethane adhesives based on adipic acid polyester

以己二酸系列聚酯二元醇为软段,合成了稳定的水性聚氨酯乳液,探讨了聚酯二元醇的分子量、链段长度及支链结构对于水性聚氨酯粒径、吸水率、力学性能、T-型剥离强度、热学性能的影响。结果表明,随着聚酯二元醇分子量的增加,乳液粒径先降低后增大,耐水性能、力学性能、T-型剥离强度、硬度及耐热性均逐渐提高,当PBA分子量为4 000时,拉伸强度及T-型剥离强度最优,分别可达28.6 MPa和26.8 N/cm;聚酯的链段结构越长,支链结构越少,耐水性能、力学性能及粘接性能越好,其中PHA为软段制备的水性聚氨酯综合性能最优,拉伸强度可达26.3 MPa,T-型剥离强度可达26.1 N/cm。

A series of waterborne polyurethane based on adipic acid polyester was synthesized,and the effect of the molecular weight of polyester glycol,chain length and structure of the branched chain on the performance of waterborne polyurethane particle size,water absorption,mechanics properties,T-type peel strength and thermal properties was discussed. The result showed that： with the increase of molecular weight of polyester glycol,the particle size of emulsion reduced first increased then,but the water resistance,mechanical properties,T-peel strength,hardness and heat resistance were increased,when the PBA molecular weight was 4 000,the tensile strength and T-type peel strength were the highest,catching28. 6 MPa and 26. 8 N / cm; however,the longer the chain structure of polyester glycol were and the less branched chain structure were,the better water resistance,mechanical properties and bonding performance were,the performance of waterborne polyurethane based on PHA was the best,the tensile strength reached to 26. 3 MPa and T-type peel strength reached to 26. 1 N / cm.