r-PET扩链增粘工艺及其单丝力学性能  被引量:6

Chain Extending Process of r-PET and Its Monofilament Mechanical Property

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作  者:陆烨邦 马海燕[1] 赵化祎 殷小峰 Lu Yebang;Ma Haiyan;Zhao Huayi;Yin Xiaofeng(College of textile and garment, Nantong University, Nantong 226000, China)

机构地区:[1]南通大学纺织服装学院,江苏南通226000

出  处:《工程塑料应用》2017年第11期13-18,共6页Engineering Plastics Application

基  金:建筑用高性能纤维及土工材料的制备与工程应用关键技术研究项目(2016YFB0303100);基于液体冷却的功能性聚合物单丝研发及产业化项目(BA2015127)

摘  要:在废旧聚对苯二甲酸乙二酯(r-PET)泡泡料中分别加入2,2'-(1,3-亚苯基)二恶唑啉(BOZ)、均苯四甲酸二酐(PMDA)扩链剂,利用双螺杆反应挤出进行扩链试验,并经熔融纺丝后多级拉伸制得r-PET单丝。通过改变扩链剂含量、挤出温度、停留时间以及抽真空条件,对扩链后的r-PET特性黏度以及单丝力学性能等进行了测试。结果表明,抽真空可显著提高扩链效果;BOZ质量分数为2.5%时,在250℃下停留60 s,特性黏度上升最高为0.77 dL/g,单丝断裂强度为4.9 cN/dtex,断裂伸长率为21.4%;PMDA质量分数为1.25%时,在260℃下停留60 s,特性黏度上升最高为0.82 dL/g,单丝断裂强度为5.2 cN/dtex,断裂伸长率为15.6%;BOZ与PMDA联用时,其含量应比各自单独扩链时的最佳含量低,当联用体系中BOZ质量分数为2%,PMDA质量分数为0.75%时,在270℃下停留60 s,r-PET特性黏度可达0.88 dL/g,单丝断裂强度为5.8 cN/dtex,断裂伸长率为18.2%。Using1,3-Bisdihydrooxazolylbenzene(BOZ)and pyromellitic dianhydride(PMDA)as chain extenders,reactive extrusion for recycled poly(ethylene terephthalate)(r-PET)was carried out in a co-rating twin screw extruder.The r-PET monofilament was prepared by melt spinning and multi-stage drawing process.Changing the content of chain extender,extrusion temperature,residence time and vacuum condition,the intrinsic viscosity,and monofilament mechanical properties of r-PET were analyzed.It is found that vacuum can significantly improve the chain extension effect.The intrinsic viscosity of r-PET extended by2.5%(mass fraction)BOZ under250℃for60s reaches a maximum value of0.77dL/g,the breaking strength of the monofilament reaches4.9cN/dtex and the elongation at break reaches21.4%.The intrinsic viscosity of r-PET extended by1.25%(mass fraction)PMDA under260℃for60s reaches a maximum value of0.82dL/g,the breaking strength of the monofilament reaches5.2cN/dtex and the elongation at break reaches15.6%.When BOZ and PMDA are took as combined chain extender of r-PET,their contents shall be lower than the optimal contents of their each single chain extension,when the mass fraction of BOZ and PMDA in the combined chain extender system is2%and0.75%respectively and the chain extending process is270℃for60s,the intrinsic viscosity can reach0.88dL/g,the breaking strength reaches5.8cN/dtex and the elongation at break reaches18.2%.

关 键 词:回收聚对苯二甲酸乙二酯 二恶唑啉 均苯四甲酸二酐 扩链 特性黏度 单丝 力学性能 

分 类 号:TQ323.4[化学工程—合成树脂塑料工业]

 

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