TPU防腐可剥离膜的制备与性能研究

Study on the preparation and properties of TPU strippable film

为保护金属原材料器件等在运输、储存过程中不被腐蚀,又便于在其使用时可及时剥离,制备了以热塑性聚氨酯(TPU)为成膜物质,硅酸聚合粉(KD)为缓蚀剂共混的TPU/KD防腐可剥离保护膜.采用~1H-NMR和FT-IR对自主合成的TPU结构进行了表征,研究了KD含量对TPU/KD膜的力学性能和可剥离性能的影响,并且进行了质量分数为3.5%NaCl溶液浸泡和电化学测试,探讨了不同KD含量的TPU/KD膜的防腐性能.研究结果表明:随KD含量增加,TPU/KD膜的拉伸强度和断裂伸长率有所下降,180°剥离强度逐渐增大;当KD含量为5%时,TPU/KD膜的腐蚀电位较大,腐蚀电流密度最小,并且其在3.5wt%NaCl浸泡30天中,膜表面少锈斑、少起泡现象,耐腐蚀性能最佳;TG结果表明,KD的加入使TPU的耐热性能有所提高.

In order to protect the metal material devices from corrosion during transportation and storage and to peel film easily when metal devices are used,TPU/KD anticorrosive strippable film is prepared by thermoplastic polyurethane(TPU)as the membrane material and the polymeric silicate powder(KD)as a corrosion inhibitor.The structure of thermoplastic polyurethane(TPU)is characterized by1H NMR and FT IR.The effects of KD content on the mechanical properties and strippable properties of TPU/KD film are investigated.The corrosion resistance of TPU/KD films with different KD content in3.5wt%NaCl solution is analyzed.The results show that,tensile strength and elongation at break of TPU/KD films decrease and180掳peel strength increase with the increase of KD content;when the content of KD is5%,the corrosion potential of TPU/KD film is high and corrosion current density is the smallest,and its resistance to3.5wt%NaCl corrosion performance is best;TG analysis results show that the addition of KD can improve the heat resistance of TPU.