接枝改性聚乙烯与聚甲醛的激光透射连接  

Laser Transmission Joining of the Graft-Modified Polyethylene and Polyoxymethylene

作　　者：姜英杰 蒋海荣[1] 谭文胜 刘会霞[1] 王霄[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]常州市大型塑料件智能化制造重点实验室,江苏常州213164

出　　处：《高分子材料科学与工程》2018年第1期95-100,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51275219);常州市高新技术研究重点实验室项目(CM20153001)

摘　　要：针对不同种类聚合物极性差异大、相容性差、不能进行激光透射连接的问题,通过对聚乙烯进行马来酸酐接枝改性来改善聚乙烯与聚甲醛的激光连接性能。首先介绍聚乙烯接枝改性的配方与工艺,并分析改性前后聚乙烯的热力学性能差异。然后进行激光透射连接实验,实验发现,接枝改性聚乙烯与聚甲醛具有较高的连接强度,两者的连接强度可达6.7 MPa,并分析了工艺参数对连接强度的影响,随着激光功率和扫描速度的增大,连接强度呈现先增大后减小的趋势。最后对聚乙烯与聚甲醛的激光透射连接机理进行了研究。指出了接枝改性对材料相容性的改善作用、材料表面自由能的增大以及焊接过程中产生的均匀小气泡的微铆接作用是改性聚乙烯与聚甲醛连接强度提高的主要原因。On account of the large polarity and compatibility difference among different kinds of polymers,it is difficult to connect them directly by laser transmission joining.The maleic anhydride grafted polyethylene was carried out in this paper,which could improve the performance of the laser transmission joining between polyethylene and polyoxymethylene.Firstly,the formulation and process of grafting modification of polyethylene were introduced,and the thermodynamic properties of the polyethylene before and after modification were analyzed.Then the laser transmission joining experiments were carried out.The experimental results show that the graft-modified polyethylene is successfully welded with polyoxymethylene,which has a high joining strength of 6.7 MPa.The influence of process parameters on the joining strength was analyzed.With the increase of laser power and scanning speed,the joining strength increases first and then decreases.Finally,the study of laser transmission joining mechanization between polyethylene and polyoxymethylene was carried out.It is pointed out that the improvement of compatibility and the surface free energy resulting from the grafting modification,the micro anchor effect of homogeneous bubbles generated in the welding process are the main reasons for improvement of the joining strength of modified polyethylene and polyoxymethylene.

关 键 词：激光技术 激光透射连接 接枝改性 聚乙烯 聚甲醛 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]