表面处理对聚乙烯粘接性能的影响
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摘要
为了提高聚乙烯板材的粘接性能,分别用火焰和空气等离子体处理方法对聚乙烯板材试样表面进行处理,根据拉伸剪切强度确定最佳处理工艺。采用傅立叶变换红外光谱、X射线光电子能谱、扫描电子显微镜、能谱仪、接触角检测等手段分析试样表面处理前后的化学组成、形貌、润湿性。结果表明,火焰处理最佳工艺条件:试样未打磨,处理距离1cm,处理速率0.625cm/s;空气等离子体处理最佳工艺条件:试样未打磨,放电功率500W,气体压力0.06MPa,放电气体为空气,处理距离1.5cm,处理时间4s。表面处理能够去除试样表面的弱边界层,引入含氧极性基团羟基和羧基,提高表面化学活性。经过火焰或空气等离子体处理的试样表面接触角分别降低为91.04°和22.43°,润湿性能得到改善。两种表面处理方法都能够明显提高试样的粘接性能。其中天山1956胶粘剂粘接火焰处理的未打磨试样,其拉伸剪切强度最大可达到4.063MPa,破坏方式为粘附破坏。
In order to enhance the bonding properties of polyethylene sheets,?ame and air plasma treatment were conducted,the optimum treatment process was determined by tensile shear strength. The results are correlated with the surface composition,morphology and wettability,which are detected by FTIR,SEM,EDS,XPS and contact angle. Optimum processing conditions for?ame treatment :unpolished sample,treatment distance 1 cm,treatment rate 0.625 cm/s. Optimum processing conditions for air plasma treatment :unpolished sample,discharge power 500 W,gas pressure 0.06 MPa,discharge gas air,treatment distance 1.5 cm,treatment time 4 s. The results show that the surface treatment can remove the weak interface layer and introduces polar groups such as hydroxyl and carbonyl group,which can obviously improve the surface chemical activity. After ?ame or air plasma treatment,the surface contact angle of the sample decreased to 91.04° and 22.43° respectively. The wettablility and the bonding properties of sample can be improved obviously by these surface treatment methods. The maximum tensile shearing strength of sample that bonded with Tianshan 1956 after ?ame treatment is 4.063 MPa,the destructive mode is adhesion destruction.
In order to enhance the bonding properties of polyethylene sheets,?ame and air plasma treatment were conducted,the optimum treatment process was determined by tensile shear strength. The results are correlated with the surface composition,morphology and wettability,which are detected by FTIR,SEM,EDS,XPS and contact angle. Optimum processing conditions for?ame treatment :unpolished sample,treatment distance 1 cm,treatment rate 0.625 cm/s. Optimum processing conditions for air plasma treatment :unpolished sample,discharge power 500 W,gas pressure 0.06 MPa,discharge gas air,treatment distance 1.5 cm,treatment time 4 s. The results show that the surface treatment can remove the weak interface layer and introduces polar groups such as hydroxyl and carbonyl group,which can obviously improve the surface chemical activity. After ?ame or air plasma treatment,the surface contact angle of the sample decreased to 91.04° and 22.43° respectively. The wettablility and the bonding properties of sample can be improved obviously by these surface treatment methods. The maximum tensile shearing strength of sample that bonded with Tianshan 1956 after ?ame treatment is 4.063 MPa,the destructive mode is adhesion destruction.
引文
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[3]杜慧勇,吴鹤翔,杨晓芳,等.粘接技术在机车车辆行业的应用[J].时代汽车,2018(3):33-34Du Huiyong,Wu Hexiang,Yang Xiaofang,et al.Application of adhesion technology in locomotive and vehicle industry[J].Auto Time,2018(3):33-34.
[4]张翼,齐暑华,段国晨,等.聚烯烃粘接的研究进展[J].材料导报,2011,25(9):77-80.Zhang Yi,Qi Shuhua,Duan Guochen,et al.The development of polyolef in adhesion[J].Material Review,2011,25(9):77-80.
[5]马晓星,刘会雪.聚烯烃材料表面改性研究[J].现代工业经济和信息化,2017,7(13):22-23,25.Ma Xiaoxing,Liu Huixue.Study on surface modification of polyolefin[J].Modern Industrial Economy and Informationization,2017,7(13),22-23,25.
[6]董怀斌.等离子体表面处理在有机高分子材料中的应用研究[J].橡塑技术与装备,2016,42(14):60-61.Dong Huaibin.Application of plasma surface treatment in organic polymer materials[J].China Rubber/Plastics Technology and Equipment,2016,42(14):60-61.
[7]Song Jing,Gunst U,Arlinghaus H F,et al.Flame treatment of lowdensity polyethylene:Surface chemistry across the length scales[J].Applied Surface Science,2007,253(24):9 489-9 499.
[8]Strobel M,Sullivan N,Branch M C,et al.Gas-phase modeling of impinging flames used for the flame surface modification of polypropylene film[J].Journal of Adhesion Science and Technology,2001,15(1):1-21.
[9]Sheng Enshan,Sutherland I,Brewis D M,et al.Surface studies of polyethylene modified by flame treatment[J].Journal of Materials Chemistry,1994,4(3):487-490.
[10]孙洁.常压等离子体处理高分子材料诱导自由基及其引发表面改性反应的研究[D].上海:东华大学,2011.Sun Jie.The Mechanism of free radical reactions induced by atmospheric pressure plasma treatment on polymer surfaces[D].Shanghai:Donghua University,2011.
[11]Penkov O V,Khadem M,Lim W S,et al.A review of recent applications of atmospheric pressure plasma jets for materials processing[J].Journal of Coatings Technology and Research,2015,12(2):225-235.
[12]Moritzer E,Budde C,Leister C.Effect of atmospheric pressure plasma pre-treatment and aging conditions on the surface of thermoplastics[J].Welding in the World,2015,59(1):23-32.
[13]颜婧,王玥,冯建明,等.空气等离子体处理时间对聚丙烯微孔膜微观结构与亲水性的影响[J].塑料工业,2015,43(11):43-46,64.Yan Jing,Wang Yue,Feng Jianming,et al.The effect of air plasma treated time on microstructure and hydrophilcity of polypropylene microporous membranes[J].China Plastics Industry,2015,43(11):43-46,64.
[14]杨晓娜.表面粗糙度对厌氧平面密封胶初固时间和粘接强度的影响[J].粘接,2018,39(5):17-20,16.Yang Xiaona.Effect of surface roughness on initial fixing time and adhesive strength of anaerobic flat sealant[J].Cohesion,2018,39(5):17-20,16.
[15]Packham D E.Surface energy,surface topography and adhesion[J].International Journal of Adhesion and Adhesives,2003,23(6):437-448.
[16]陈淼,尹业琳,刘亚琼,等.双组分聚氨酯密封胶的制备与性能研究[J].中国胶粘剂,2016,25(10):32-35.Chen Miao,Yin Yelin,Liu Yaqiong,et al.Study on preparation and properties of two-component polyurethane sealant[J].China Adhesives,2016,25(10):32-35.