插线板用高抗冲阻燃耐热PET/PC合金的制备
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摘要
采用双螺杆挤出机熔融共混挤出制备了聚对苯二甲酸乙二酯/聚碳酸酯(PET/PC)合金。研究了PET和PC黏度对合金力学性能、耐热性能、阻燃性能的影响。结果表明,PC树脂的黏度不会影响PET的结晶行为,且PC树脂的黏度越大,合金的力学性能和耐热性能越好。中黏PET的结晶度高有利于提高合金的耐热性能,但是会降低合金的韧性。选用高黏PET和高黏PC的组合可以得到高韧性、高耐热的合金。酯交换抑制剂的加入可以抑制PET和PC之间的酯交换反应,使得合金的球压痕直径减小。但是过多的酯交换抑制剂会降低材料的韧性,当酯交换抑制剂添加量超过0.6份后,合金的悬臂梁缺口冲击强度降低至23kJ/m~2以下。加入少量的扩链剂可以提高合金的力学性能。在增容剂、阻燃剂等加工助剂一定的情况下,基体树脂选用高黏PET和高黏PC,并加入0.4份酯交换抑制剂、0.2份扩链剂,此时合金的综合性能最好,缺口冲击强度达到62kJ/m~2,球压痕直径为1.9mm,满足插线板的国家标准要求。
The polyethylene terephthalate/polycarbonate(PET/PC) alloy was prepared by melt blending,extruded by twin screw extruder. The effects of the viscosity of PET and PC on the mechanical properties,heat resistance and flame retardancy of the PET/PC alloy were studied. The results show that the viscosity of PC resin does not affect the crystal behavior of PET,and increased viscosity of PC can improve the mechanical properties and heat resistance of the the PET/PC alloy. High crystallinity of moderately bonded PET is beneficial to improve the heat resistance of the the PET/PC alloy,but reduces the toughness of the the PET/PC alloy. Choosing high viscosity PET and PC can get the PET/PC alloy with high toughness and heat resistance. The addition of transesterification inhibitors can inhibit the transesterification reaction between PET and PC,reduce the ball indentation diameter of the PET/PC alloy. But too many transesterification inhibitors can significantly reduce the toughness of the alloy,when the dosage of transesterification inhibitor reaches 0.6 phr,the notched Izod impact strength of the alloy decreases to below 23 kJ/m~2. The mechanical properties of the alloy can be improved by adding a small amount of chain extender. Under certain conditions of compatibilizer and flame retardant,chosing high viscous PET and high viscous PC as matrix resin,adding 0.4 phr of ester exchange inhibitor and 0.2 phr of chain extender,the comprehensive performance of the alloy is the best. The impact strength is 62 kJ/m~2,the ball indentation diameter is 1.9 mm. The alloy meets the national standard requirements of plugboard.
The polyethylene terephthalate/polycarbonate(PET/PC) alloy was prepared by melt blending,extruded by twin screw extruder. The effects of the viscosity of PET and PC on the mechanical properties,heat resistance and flame retardancy of the PET/PC alloy were studied. The results show that the viscosity of PC resin does not affect the crystal behavior of PET,and increased viscosity of PC can improve the mechanical properties and heat resistance of the the PET/PC alloy. High crystallinity of moderately bonded PET is beneficial to improve the heat resistance of the the PET/PC alloy,but reduces the toughness of the the PET/PC alloy. Choosing high viscosity PET and PC can get the PET/PC alloy with high toughness and heat resistance. The addition of transesterification inhibitors can inhibit the transesterification reaction between PET and PC,reduce the ball indentation diameter of the PET/PC alloy. But too many transesterification inhibitors can significantly reduce the toughness of the alloy,when the dosage of transesterification inhibitor reaches 0.6 phr,the notched Izod impact strength of the alloy decreases to below 23 kJ/m~2. The mechanical properties of the alloy can be improved by adding a small amount of chain extender. Under certain conditions of compatibilizer and flame retardant,chosing high viscous PET and high viscous PC as matrix resin,adding 0.4 phr of ester exchange inhibitor and 0.2 phr of chain extender,the comprehensive performance of the alloy is the best. The impact strength is 62 kJ/m~2,the ball indentation diameter is 1.9 mm. The alloy meets the national standard requirements of plugboard.
引文
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[3]Jiang Jing,Wang Shiwei,Hou Jianhua,et al.Effect of injection velocity on the structure and mechanical properties of micro injection molded polycarbonate/poly(ethylene terephthalate)blends[J].Materials&Design,2018,141:132-141.
[4]Ishigami I,Kodama Y,Wagatsuma T,et al.Evaluation of structures and morphologies of recycled PC/PET blends fabricated by high-shear kneading processing[J].Polymer Processing,2017,32(5):568-573.
[5]段浩,汤俊杰,李昌鸿,等.相容剂对PC/R-PET合金的影响[J].塑料工业,2017,45(4):31-35.Duan Hao,Tang Junjie,Li Changhong,et al.The influence of compatibilizer on PC/R-PET alloy[J].China Plastics Industry,2017,45(4):31-35.
[6]陶永亮,陈晓东.PC/PET合金制品开裂的原因分析与解决方法[J].工程塑料应用,2016,44(8):69-72.Tao Yongliang,Chen Xiaodong.Reason analysis and solutions for cracking of PC/PET alloy parts[J].Engineering Plastics Application,2016,44(8):69-72.
[7]Habibelahi M,Ehsani M,Morshedian J.Compatibilization of polycarbonate/poly(ethyleneterephalate)blends by addition of their transesterification product[J].Polyolefins Journal,2019,6(1):75-83.
[8]崔恩兵.PBT/PC与PBT/PET共混体系性能研究[D].济南:山东大学,2016.Cui Enbing.Research on properties of PBT/PC and PBT/PETcomposites[D].Jinan:Shandong University,2016.
[9]Wiwattananukul R,Hachiya Y,Nobukawa S,et al.Selective localization of carbon nanotubes in PC/PET blends[J].Polymer Composites,2017,38(6):1 103-1 111.
[10]Ishigami A,Kodama Y,Wagatsuma T,et al.Evaluation of structures and morphologies of recycled PC/PET blends fabricated by high-shear kneading processing[J].International Polymer Processing Journal of the Polymer Processing Society,2017,32(5):568-573.
[11]刘昳阳.高性能化PET和PC/PET合金[D].广州:华南理工大学,2018.Liu Yiyang.High performance PET and PC/PET alloy[D].Guangzhou:South China University of Technology,2018.
[12]高磊,李强,李文强,等.含再生材料的PC/PET无卤阻燃合金加工稳定性[J].工程塑料应用,2016,44(5):55-59.Gao Lei,Li Qiang,Li Wenqiang,et al.Processing stability of recycled materials PC/PET alloy containing halogen-free flame retardant[J].Engineering Plastics Application,2016,44(5):55-59.
[13]王静,揣成智.有机刚性粒子增韧改性PC/PET共混物[J].塑料,2015,44(1):7-9.Wang Jing,Chuai Chengzhi.Toughening modification of PC/PETblend by organic rigid particles[J].Plastics,2015,44(1):7-9.
[14]刘裕红.PC/PET合金的制备与性能研究[J].塑料科技,2015,43(11):36-39.Liu Yuhong.Study on properties of PC/PET alloy and its preparation[J].Plastics Science and Technology,2015,43(11):36-39.
[15]周立权,温浩宇,徐刚,等.PET/PC合金的研制与性能研究[J].现代塑料加工应用,2017,29(6):13-15.Zhou Liquan,Wen Haoyu,Xu Gang,et al.Research and properties of the PET/PC alloy[J].Modern Plastics Processing and Application,2017,29(6):13-15.
[16]王香香.废聚酯瓶片/聚碳酸酯共混改性及轻质化研究[D].广州:华南理工大学,2016.Wang Xiangxiang.Study on recycled PET bottle flaks/polycarbonate lightweight modified blends[D].Guangzhou:South China University of Technology,2016.