Abstract: Copolymerized polyether-polyurethane elastomers (CEUs) are prepared by transesterification polycondensation method with castor oil-based polyoxyethylene ether (EL),polyoxytetramethylene glycol (PTMG) and 1,6-dimethylhexane dicarbamate (HDC) as raw materials,dibutyltin dilaurate as catalyst,and 1,4-butanediol as chain extender.EL and PTMG are used as the soft segment,and HDC is used as the hard segment.The properties of CEUs are characterized by IR,TGA and mechanical performance tests.Effects of the material ratio,the temperature,time and pressure in pre-polymerization stage,and the temperature and time in polycondensation stage on the mechanical properties of CEUs are investigated by a series of single factor experiments.The results show that the optimum conditions are determined as follows:n(EL)∶n(PTMG)=1∶5,n(soft segment)∶n(hard segment)=1∶1.07,the temperature,time and pressure are 110℃,45 min and 0.03 MPa in the pre-polymerization stage,and the temperature and time 170℃ and 180 min in the polycondensation stage.The CEUs prepared under the optimum conditions has a tensile strength of 3.23 MPa,an elongation at break of 972.38%,and a Shore A hardness of 60.
[1] 山西化工研究所编.聚氨酯弹性体手册[M].北京:北京化学工业出版社,2011:1-9. [2] Rogulska M,Kultys A,Podkoscielny W.Studies on thermoplastic polyurethanes based on new diphenylethane-derivative diols.Ⅱ.Synthesis and characterization of segmented polyurethanes from HDI and MDI[J].European Polymer Journal,2007,43(4):1402-1414. [3] 张志毅,牛慧军,崔言云.不同异氰酸酯型聚氨酯弹性体的制备与力学性能研究[J].弹性体,2012,22(3):52-55. [4] 张丽.我国聚氨酯产业现状分析及展望(续完)[J].化学工业,2015,33(2):12-22. [5] Guan J,Song Y,Lin Y,et al.Progress in study of non-isocyanate polyurethane[J].Industrial&Engineering Chemistry Research,2011,50(11):6517-6527. [6] 筱羽.1,6-六亚甲基二氨基甲酸甲酯绿色合成研究[A].中国化工学会化学工程专业委员会、中国化工学会生物化工专业委员会.第三届全国化学工程与生物化工年会论文摘要集(下)[C].中国化工学会化学工程专业委员会、中国化工学会生物化工专业委员会:中国化工学会,2006:1. [7] 刘冰灵,田恒水,崔喜.钛酸四乙酯催化酯交换缩聚法合成聚醚型聚氨酯[J].化工进展,2016,35(3):856-860. [8] 袁野,王强,欧阳春发,等.非异氰酸酯聚氨酯的最新研究进展[J].聚氨酯工业,2015,30(1):5-8. [9] Trevino A S,Trumbo D L.Acetoacetylated castor oil in coatings applications[J].Progress in Organic Coatings,2002,44(1):49-54. [10] 杜辉,殷宁,赵雨花,等.蓖麻油-聚醚基聚氨酯弹性体的制备和表征[J].化工新型材料,2009,37(2):106-108. [11] Hablot E,Zheng D,Bouquey M,et al.Polyurethanes based on castor oil:Kinetics,chemical,mechanical and thermal properties[J].Macromolecular Materials and Engineering,2008,293(11):922-929. [12] Yeganeh H,Amin M,Shamekhi M A.Novel polyurethane insulating coatings based on polyhydroxy compounds,derived from glycolyzed PET and castor oil[J].Journal of Applied Polymer Science,2006,99(3):1222-1233. [13] 李阳.蓖麻油改性环氧聚氨酯防腐蚀涂料的研制[J].当代化工,2012,41(6):566-568. [14] 何蕾,杨隽,涂洁,等.蓖麻油基水性聚氨酯的合成及性能[J].武汉工程大学学报,2010,32(3):79-81. [15] Yeganeh H,Mehdizideh M R.Synthesis and properties of isocyanate curable millable polyurethane elastomers based on castor oil as a renewable resource polyol[J].European Polymer Journal,2004,40:1233-1238. [16] Mishra A K,Chattopadhyay D,Sreedhar B,et al.FT-IR and XPS studies of polyurethane-urea-imide coatings[J].Progress in Organic Coatings,2006,55(3):231-243. [17] Jia S Y,Ren Y R,Liu L M,et al.Stannous-acetylacetonate:A new catalyst for poly (trimethylene terephthalate) synthesis[J].Chinese Chemical Letters,2007,18(7):827-830. [18] Ferreira P,Pereira R,Coelho J F J,et al.Modification of the biopolymer castor oil with free isocyanate groups to be applied as bioadhesive[J].International Journal of Biological Macromolecules,2007,40:144-152. [19] 罗红,侯晓辉,康永.聚氨酯弹性体研究应用天津化工[J].天津化工,2011,1(25):9-12. [20] 褚衍倩,魏永梅,田恒水,等.PEG/PTMG共聚醚型聚氨酯弹性体制备工艺的研究[J].现代化工,2018,38(7):132-135,137. [21] 汪昆华,罗传秋,周啸.聚合物近代仪器分析[M].北京:清华大学出版社,2000:171-173.