赖氨酸改性抗菌水性聚氨酯的制备及性能

Preparation and properties of lysine modified antibacterial waterborne polyurethane

采用预聚体法,以聚醚二元醇、异佛尔酮二异氰酸酯(IPDI)为预聚物原料,引入交联剂三羟甲基丙烷(TMP),亲水扩链试剂N-甲基二乙醇胺(MDEA)、聚乙二醇,以及中和剂3,4-二羟基苯甲酸(PCA),制备了具有抗菌性能的阳-非离子型水性聚氨酯,在此基础上引入赖氨酸(Lys)改性以提高抗菌性能,研究了Lys含量对聚氨酯乳液性能以及胶膜分子结构、力学性能及抗菌性能的影响规律。结果表明,可同时采用MDEA阳离子、聚乙二醇聚合单元、Lys和PCA 4种具有抗菌作用的组分合成抗菌水性聚氨酯;以MDEA、聚乙二醇为亲水组分的阳-非离子水性聚氨酯具有抗菌特性;Lys的引入能够有效提高水性聚氨酯的抗菌性能;当Lys含量为聚氨酯乳液固体部分质量的3%时,水性聚氨酯胶膜具有较好的力学性能和抗菌性能;无Lys改性和Lys改性的阳-非离子水性聚氨酯的抗菌机理均为接触型抗菌。

Cationic and non-ionic waterborne polyurethane with antibacterial properties was prepared by prepolymer method,using polyether diol and isoflurone diisocyanate(IPDI)as prepolymer raw materials,introducing cross-linking agent trimethylolpropane(TMP),hydrophilic chain extender N-methyldiethanolamine(MDEA),polyethylene glycol,and neutralizer 3,4-dihydroxybenzoic acid(PCA).On this basis,lysine(Lys)was introduced to improve antibacterial properties.The effects of Lys content on the properties of polyurethane emulsion,as well as the molecular structure,mechanical properties and antibacterial properties of the polyurethane film were studied.The results show that the antibacterial waterborne polyurethane can be synthesized by simultaneously using four components with antibacterial effects including MDEA cation,polyethylene glycol polymerization unit,Lys,and PCA.Cationic and non-ionic waterborne polyurethane with MDEA and polyethylene glycol as the hydrophilic components has antibacterial properties.The introduction of Lys can effectively improve the antibacterial properties of waterborne polyurethane.When Lys content accounts for 3%of the solid mass of polyurethane emulsion,the waterborne polyurethane film has better mechanical properties and antibacterial properties.Both non Lys modified and Lys modified cationic and non-ionic waterborne polyurethanes exhibit contact type antibacterial mechanisms.