摘要
利用硅烷偶联剂KH560对木粉/聚乙烯复合材料进行表面处理以改善其胶接性能。利用接触角、吸水量、表面形貌以及胶接强度测试等分析方法,研究了硅烷偶联剂处理聚乙烯木塑复合材料胶接接头在水环境中的胶接耐久性能。试验结果表明,机械打磨并偶联剂处理后,聚乙烯木塑复合材表面接触角增加,表面粗糙度增大,胶接强度和耐水性明显提高。偶联剂分子链上环氧基团的"架桥"作用以及甲氧基的憎水作用,是粘接强度和耐水性能提高的主要原因。浸水环境下,聚乙烯木塑复合材料表面粗糙度略有降低;随着浸水时间的延长,表面接触角下降,胶接接头的吸水量增加,胶接强度下降。水环境下聚乙烯木塑复合材料中木质纤维成分的吸水膨胀,是造成胶接强度下降的主要原因。
The surface of wood/polyethylene （PE） composites was treated by silane coupling agent KH561） to improve its adhesion properties.The analysis method such as contact angle measurement,water absorption test,surface topography observation and bonding strength test were used to study the durability under the water soaking condition for the bonding joints ofsilane coupling agent treated wood/PE composites.The results showed that the contact angle and roughness of the composites surface increased and the bonding strength and water-resistance of the composite joints were improved after surface treatment of polishing and coupling agent coating.And the coupling action of epoxy groups and the hydrophobic action ofmethoxy groups within the coupling agent are the reason of the improvement of bonding strength and water-resistance.In the condition of water soaking,the surface roughness of composites decreased;and with the soaking time extended,the contact angle and water absorption of the bonding joint of increased and the bonding strength decreased obviously.The caused swelling of wood fiber within PE/wood composite by absorbing water could result in the residual stress within the adhesion interface,which reduced the bonding strength of the joints.
出处
《粘接》
CAS
2012年第5期42-45,共4页
Adhesion
基金
林业公益性行业科研专项(201204802)
黑龙江省博士后科研启动基金资助项目(LBH-Q09175)
黑龙江省哈尔滨市科技创新人才研究专项资金项目(2011RFXXG016)资助
