管道热收缩带热熔胶熔融情况对黏结性能的影响
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摘要
胶黏剂充分润湿被黏结基体表面是实现良好黏结的关键,对于热熔胶体系,热熔胶的温度与熔体流动性及表面张力密切相关,从而对其润湿性具有决定作用。采用差示扫描量热法和环球软化点法分别从微观和宏观层面对国内外热收缩带热熔胶的熔融性能进行试验,根据热熔胶熔融软化情况设计不同条件制备剥离试件并考察其黏结性能。结果表明:大部分热熔胶熔融黏结时温度应达到160℃以上,且与被黏结表面接触至少20 min,才能实现内聚破坏并取得良好黏结效果;不同加热方式剥离试件和安装系统的制备安装及剥离强度试验,验证了热熔胶在160℃以上能实现良好的熔融黏结。
The substrate surface fully wetted by adhesives is a key factor for achieving good adhesion.For hot melt adhesives system,the temperature of hot melt adhesive,which is closely related to fluidity and surface tension,has a decisive effect on the wetting property. The differential scanning calorimetry method and ring and ball softening point method are used to investigate the meltability of the hot melt adhesives of heat shrinkable tapes at home and abroad from the micro and macro levels respectively.Stripping test pieces prepared under different conditions are used to investigate the adhesive property.The results show that a suitable bonding temperature above 160 ℃ and a contact time of at least 20 min are important for hot melt adhesives to achieve cohesion failure and good bonding effect. It is verified that adhesives can achieve good bonding above 160 ℃ by the results of test pieces and installation systems prepared by different heating methods. Finally,in view of the thermal shock resistance of the base material for heat shrinkable tapes, suggestions on the suitable operating temperature and other details about using heat shrinkable tapes are proposed.
The substrate surface fully wetted by adhesives is a key factor for achieving good adhesion.For hot melt adhesives system,the temperature of hot melt adhesive,which is closely related to fluidity and surface tension,has a decisive effect on the wetting property. The differential scanning calorimetry method and ring and ball softening point method are used to investigate the meltability of the hot melt adhesives of heat shrinkable tapes at home and abroad from the micro and macro levels respectively.Stripping test pieces prepared under different conditions are used to investigate the adhesive property.The results show that a suitable bonding temperature above 160 ℃ and a contact time of at least 20 min are important for hot melt adhesives to achieve cohesion failure and good bonding effect. It is verified that adhesives can achieve good bonding above 160 ℃ by the results of test pieces and installation systems prepared by different heating methods. Finally,in view of the thermal shock resistance of the base material for heat shrinkable tapes, suggestions on the suitable operating temperature and other details about using heat shrinkable tapes are proposed.
引文
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[2]沈光霁,陈洪源,薛致远,等.管道涂层应用现状分析[J].腐蚀科学与防护技术,2013,25(3):246-249.SHEN Guangji,CHEN Hongyuan,XUE Zhiyuan,et al.Analysis of current status of pipeline coating application[J].Corrosion Science and Protection Technology,2013,25(3):246-249.
[3]那骥宇,赫连建峰,李爱贵,等.管道外防腐补口技术发展和趋势[J].石油工程建设,2017,43(2):1-4.NA Jiyu,HELIAN Jianfeng,LI Aigui,et al.Discussion on development of field joint coatings for pipelines[J].Petroleum Engineering Construction,2017,43(2):1-4.
[4]陈洪源,刘玲莉,赵君,等.三层PE管道热收缩带失效原因[J].腐蚀与防护,2010,31(2):154-157.CHEN Hongyuan,LIU Lingli,ZHAO Jun,et al.Failure reasons of heat shrinkable sleeve for 3PE pipeline[J].Corrosion and Protection,2010,31(2):154-157.
[5]罗锋,王国丽,窦鹏,等.管道热收缩带补口失效原因分析及相关对策研究[J].石油规划设计,2012,23(1):11-15.LUO Feng,WANG Guoli,DOU Peng,et al.Analysis of causes for failure of pipeline heat shrinkable tape coatings and related countermeasures[J].Petroleum Planning and Engineering,2012,23(1):11-15.
[6]王世银,范小银,刘长海.3PE热收缩带老化失效的原因分析及改进建议[J].腐蚀与防护,2018,39(2):162-166.WANG Shiyin,FAN Xiaoyin,LIU Changhai.Analysis of aging failure of 3PE heat shrinkable sleeve and improvement measures[J].Corrosion and Protection,2018,39(2):162-166.
[7]孙海明,刘立群,张海雷.管道3LPE防腐蚀层补口失效原因及建议[J].腐蚀与防护,2016,37(1):60-67.SUN Haiming,LIU Liqun,ZHANG Hailei.Failure reason and suggestion for 3LPE pipeline field joint coating[J].Corrosion and Protection,2016,37(1):60-67.
[8]KHONAKDAR H A,JAFARI S H,YAVARI A,et al.Morphology and estimation of interfacial tension of LDPE/EVA and HDPE/EVA Blends[J].Polymer Bulletin,2005(54):75-84.
[9]International Standardization Organization Technical Committee 61.Plastics-Differential scanning calorimetry(DSC)-Part 3:Determination of temperature and enthalpy of melting and crystallization:ISO 11357-3-2018[S].Geneva:International Standardization Organization,2018:1-6.
[10]张小英,王翠红,黄鹤,等.沥青软化点测定法环球法:GB/T 4507-2014[S].北京:中国标准出版社,2014:1-6.ZHANG Xiaoying,WANG Cuihong,HUANG He,et al.Standard Test Method for Softening Point of BitumenRing-and-Ball Apparatus:GB/T 4507-2014[S].Beijing:Standards Press of China,2014:1-6.
[11]金卫星,陈维斌,王灿,等.胶粘带剥离强度的试验方法:GB/T 2792-2014[S].北京:中国标准出版社,2014:1-13.JIN Weixing,Chen Weibin,WANG Can,et al.Measurement of Peer Adhesion Properties for Adhesive Tapes:GB/T 2792-2014[S].Beijing:Standards Press of China,2014:1-13.
[12]International Standardization Organization Technical Committee 67.Petroleum and natural gas industries-External coatings for buried or submerged pipelines used in pipeline transportation systems-Part 3:Field joint coatings:ISO21809-3-2016[S].Geneva:International Standardization Organization,2016:106-108.
[13]张其滨,刘金霞,赫连建锋,等.埋地钢质管道聚乙烯防腐层:GB/T 23257-2017[S].北京:中国标准出版社,2017:30-31.ZHANG Qibin,LIU Jinxia,HELIAN Jianfeng,et al.Polyethylene Coating for Buried Steel Pipeline:GB/T23257-2017[S].Beijing:Standards Press of China,2017:30-31.
[14]RADHAKRISHNAN C K,SUJITH A,UNNIKRISHNANG.Thermal behaviour of styrene butadiene rubber/poly(ethylene-co-vinyl acetate)blends[J].Journal of Thermal Analysis and Calorimetry,2007,90(1):191-199.