Effects of crosslinker on physicochemical and mechanical properties of polyurethane

doi:10.19936/j.cnki.2096-8000.20220528.012

Abstract

Abstract: Five kinds of polyurethanes resins (PU) were prepared with polymethylene polyphenyl isocyanate(PMDI) and polyether polyol and using small molecule ternary alcohols with different structures as crosslinker. The effects of crosslinker structure on heat release, rheological properties, thermal properties and mechanical properties of polyurethane were studied. The results showed that the secondary hydroxyl group and benzene ring in the molecular structure of the crosslinker prolonged the gelation time of the polyurethane resin, and slightly increased the heat resistance and T_g. The activity of polyurethane synthesized by crosslinking agent containing long unsaturated carbon chain is decreased,and the applicable period is greatly increased,but the hard segment regularity is poor,and the T_g and mechanical properties are decreased. When DIPA-PGE was used as crosslinker, the maximum T_g was 73.8 ℃. MIPA-PGE had the best comprehensive mechanical properties, and the tensile strength reached 51.6 MPa.

Key words: two-component polyurethane, crosslinker, rheological property, pot life, composites

CLC Number:

TB332

YU Kai, WANG Jun, QI Fu-min, HE Chuan. Effects of crosslinker on physicochemical and mechanical properties of polyurethane[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(5): 85-91.

References

[1] MADBOULY S A, XIA Y, KESSLER M R. Rheological behavior of environmentally friendly castor oil-based waterborne polyurethane dispersions[J]. Macromolecules, 2013, 46(11): 4606-4616.
[2] 崔璐, 强西怀, 李玉, 等. 聚氨酯皮革固色剂的应用性能研究[J]. 皮革科学与工程, 2016, 26(6): 29-33.
[3] BLIEM P, VAN HERWIJNEN H W G, RIEGLER M, et al. Investigation of important influencing factors on the tensile shear strength of two component polyurethane with distinct foaming behaviour[J]. International Journal of Adhesion and Adhesives, 2018, 84: 343-349.
[4] 鲍铮, 刘钧, 张鉴炜, 等. 硬质聚氨酯泡沫压缩性能增强研究进展[J]. 工程塑料应用, 2016, 44(8): 124-128.
[5] XU Y, PETROVIC Z, DAS S, et al. Morphology and properties of thermoplastic polyurethanes with dangling chains in ricinoleate-based soft segments[J]. Polymer, 2008, 49(19): 4248-4258.
[6] 苗毅, 史铁钧, 杭国培, 等. 硬段含量对聚氨酯和聚氨酯脲氢键化程度的影响[J]. 化学推进剂与高分子材料, 2008, 6(2): 40-44.
[7] 朱广超, 王贵友, 胡春圃. 交联密度对脂肪族聚氨酯弹性体结构与性能的影响[J]. 高分子学报, 2011(3): 274-280.
[8] HEJNA A, KIRPLUKS M, KOSMELA P, et al. The influence of crude glycerol and castor oil-based polyol on the structure and performance of rigid polyurethane-polyisocyanurate foams[J]. Industrial Crops and Products, 2017, 95: 113-125.
[9] 朱永群, 黄亦军. 软段结构对聚酯型聚氨酯结晶性影响的研究[J]. 高分子材料科学与工程, 1994(3): 80-83.
[10] YARMOHAMMADI M, KOMEILI S, SHAHIDZADEH M. Studying crosslinker chemical structure effect on the tuning properties of HTPB-based polyurethane [J]. Propellants, Explosives, Pyrotechnics, 2018, 43(2): 156-161.
[11] LUONG N D, SINH L H, MINNA M, et al. Synthesis and characterization of castor oil-segmented thermoplastic polyurethane with controlled mechanical properties[J]. European Polymer Journal, 2016, 81: 129-137.
[12] 赵庆波, 赵春丽, 冯曼, 等. 连续玻纤增强聚氨酯树脂复合材料制备及性能研究[J]. 聚氨酯工业, 2016, 31(3): 5-9.
[13] 张波. 低发泡高强度高韧性聚氨酯树脂的制备与性能研究[D]. 武汉: 武汉理工大学, 2017.
[14] LI G, LI E, WANG C, et al. Effect of the blocked ratio on properties of natural fiber-waterborne blocked polyurethane composites[J]. Journal of Composite Materials, 2014, 49(16): 1929-1936.
[15] PETER J, HALLEY, et al. Chemorheology of thermosets-an overview[J]. Polymer Engineering & Science, 1996, 36(5): 593-609.