为解决海洋工程中金属器件的腐蚀问题，本工作以聚四氢呋喃醚二醇(PTMG1000)、二苯基甲烷二异氰酸酯(MDI)和4，4'-亚甲基二(2-氯苯胺)(MOCA)为原料合成聚氨酯脲弹性体，利用环氧树脂对其进行改性，将环氧链段引入到聚氨酯脲分子结构中，制备出无定形结构的环氧树脂改性聚氨酯脲弹性体(PUU-s)以作为器件的包覆材料提高包覆材料的力学性能、附着力、耐水性等性能，并系统地研究了在4.5 MPa、25 ℃的人造海水环境中环氧树脂E51 含量对包覆材料的力学性能、附着力、耐水性能、抗渗透性能和耐腐蚀性能的影响。 结果表明，随着环氧树脂E51 用量的增加，包覆材料的抗拉强度、断裂伸长率和附着力先增大后减小，包覆材料的吸水率逐渐降低，抗渗透性能和耐腐蚀能力先增强后减弱。 当环氧树脂E51 用量为5%(质量分数)时，改性聚氨酯脲的综合性能最优异。 改性聚氨酯脲的拉伸强度、断裂伸长率和附着力分别为25.8 MPa、605%和14.5 MPa，与未改性的聚氨酯脲相比，3 种性能分别提高了4.2 MPa、45%、5 MPa，浸泡960 h 后改性聚氨酯脲具有更好的抗渗透性能；与未改性的聚氨酯脲相比，改性聚氨酯脲保护的基材未出现明显的腐蚀点，对基材具有一定的保护能力。
In order to address the corrosion issues of metallic components in marine engineering,polyurethane urea elastomers were synthesized using polytetrahydrofuran ether diol (PTMG1000), diphenylmethane diisocyanate (MDI) and 4,4'-methylenebis(2-chloroaniline) (MOCA)as raw materials.The elastomers were modified with epoxy resin, and epoxy segments were introduced into the polyurethane molecular structure to prepare an amorphous structure of epoxy resin-modified polyurethane urea elastomer (PUU-s) as coating material.This modification was intended to enhance the mechanical properties, adhesion, water resistance and other properties of the coating material.A systematic investigation was conducted to evaluate the effects of epoxy resin E51 content on the mechanical properties, adhesion, water resistance, permeability resistance and corrosion resistance of the coating material in a synthetic seawater environment at 4.5 MPa and 25 ℃.The results showed that, with the increase in the amount of epoxy resin E51, the tensile strength, elongation at break and adhesion of the coating material first increased and then decreased, while the water absorption rate was gradually decreased.The permeability resistance and corrosion resistance were initially improved and subsequently were diminished.When the epoxy resin E51 content was maintained at 5%(mass fraction),the modified polyurethane urea was found to exhibit optimal overall performance.The tensile strength, elongation at break and adhesion of the modified polyurethane urea were measured to be 25.8 MPa, 605%and 14.5 MPa, respectively, representing improvements of 4.2 MPa, 45%and 5 MPa compared to the unmodified polyurethane urea.After soaking for 960 h, superior permeability resistance was demonstrated by the modified polyurethane urea；moreover, the substrate protected by the modified polyurethane urea was found to show no significant corrosion points compared to the unmodified polyurethane urea, indicating a certain degree of protective capability for the substrate.
