CAJ | 학술논문

为制备80℃下长期使用的低压缩永久变形密封材料，以聚己内酯二元醇（ PCL）、4，4′－二苯基甲烷二异氰酸酯（ MDI）、1，4－丁二醇（ BDO）、氢醌双（2－羟乙基）醚（ HQEE）为原料，采用预聚体法合成热塑性聚氨酯弹性体（ TPU）。研究聚合温度、—NCO／—OH摩尔比以及混合扩链剂HQEE／BDO质量比对TPU力学和动态力学性能的影响。实验结果表明：随着聚合温度的提高， TPU的拉伸强度和撕裂强度提高，聚合温度为120℃时TPU的力学性能最好；随着—NCO／—OH摩尔比的提高， TPU的拉伸强度提高，撕裂强度先增加然后降低，压缩永久变形先降低然后增加，微相分离程度降低，弹性滞后增加；随着混合扩链剂HQEE／BDO质量比的增加， TPU的硬度、回弹率逐渐增加，拉伸强度和撕裂强度先增加后降低，压缩永久变形先降低后增加，微相分离程度提高，弹性滞后减小，当混合扩链剂HQEE／BDO质量比为80／20时TPU的压缩永久变形（80℃×70 h）最低为21％。
위제비80℃하장기사용적저압축영구변형밀봉재료，이취기내지이원순（ PCL）、4，4′－이분기갑완이이청산지（ MDI）、1，4－정이순（ BDO）、경곤쌍（2－간을기）미（ HQEE）위원료，채용예취체법합성열소성취안지탄성체（ TPU）。연구취합온도、—NCO／—OH마이비이급혼합확련제HQEE／BDO질량비대TPU역학화동태역학성능적영향。실험결과표명：수착취합온도적제고， TPU적랍신강도화시렬강도제고，취합온도위120℃시TPU적역학성능최호；수착—NCO／—OH마이비적제고， TPU적랍신강도제고，시렬강도선증가연후강저，압축영구변형선강저연후증가，미상분리정도강저，탄성체후증가；수착혼합확련제HQEE／BDO질량비적증가， TPU적경도、회탄솔축점증가，랍신강도화시렬강도선증가후강저，압축영구변형선강저후증가，미상분리정도제고，탄성체후감소，당혼합확련제HQEE／BDO질량비위80／20시TPU적압축영구변형（80℃×70 h）최저위21％。
In order to prepare the low permanent compression deformation seal materials for long?term use at 80 ℃, a thermoplastic polyurethane elastomer( TPU) were synthesized with polycaprolactone diol( PCL) ,4,4′?diphenyl methane di?isocyanate(MDI),Hydroquinone bis(2?hydroxyethyl)ether(HQEE),1,4?butanediol(BDO)as raw materials by prepoly?mer method.The effects of polymerization temperature,mass ratio of chain extender and isocyanate index on the mechanical properties and dynamic mechanical properties of TPU were studied.The results show that with the increasing of polymeriza?tion temperature,the tensile strength and tear strength are improved,the TPU synthesized at the polymerization temperature of 120 ℃ has the best mechanical properties.With the increasing of isocyanate index,the tensile strength is increased,the tear strength is first increased and then decreased,the compression set is first decreased and then increased,the degree of microphase separation is reduced,elastic hysteresis is increased.With the increasing of the ratio of HQEE and BDO chain extenders,the hardness and resilience rate are gradually increased,the tensile strength and the tear strength are increased first and then decreased,the permanent compression deformation is decreased first and then increased,the micro phase sep?aration degree is increased,and the elastic hysteresis is reduced. The synthesized TPU has the minimum permanent com?pression deformation of 21% at 80 ℃ and 70 h when the mass ratio of HQEE/BDO is 80/20.