常压等离子体处理对单板表面特性及豆胶胶合的影响  

Effect of atmospheric pressure plasma treatment on veneer surface characteristics and soy protein adhesive bonding

作　　者：陈敏智 陈燕 NGUYEN Thiphuong 周晓燕 卞杰 

机构地区：[1]南京林业大学材料科学与工程学院,南京210037 [2]南京苏曼等离子科技有限公司,南京210001

出　　处：《林业工程学报》2017年第5期9-14,共6页Journal of Forestry Engineering

基　　金：林业科技成果国家级推广项目([2016]42);江苏省科技厅前瞻性联合研究项目(BY2016006-03);江苏省"333工程"资助项目(BRA2016381);江苏省"青蓝工程"科技创新团队;江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：采用常压空气介质阻挡放电等离子体对杨木单板表面进行改性处理,利用自制纳米纤维素改性大豆蛋白胶黏剂制备胶合板,研究等离子体处理工艺对杨木单板表面润湿性能和杨木胶合板胶合性能的影响,以期提高胶合板性能、降低施胶量,并从等离子体处理对微观形貌和化学组分两方面的影响分析其机理。试验结果表明:常压等离子体处理后,胶液在单板表面的初始接触角和平衡角相比未处理单板最大分别下降12.4%和46.3%,润湿性能得到明显改善;在达到Ⅱ类胶合板胶合性能的前提下可降低一定的施胶量;改性单板表面粗糙度提高,含氧官能团含量增加,均有利于胶液在单板表面的润湿。综合胶合板性能与经济效益,选择较优处理工艺条件为处理功率4.5 kW、处理速率14 m/min和单面施胶量140 g/m^2。The environmental-friendly natural adhesive made from renewable resources has become the research interests for the Chinese wood-based panel industry in recent years. The soy protein adhesive has received more and more atten- tion due to its relatively excellent performance. However, the drawbacks, such as poor water resistance and high vis- cosity, have hindered its application in the industrial production. In this study, the atmospheric pressure plasma treat- ment was used to improve the bonding properties between wood and soy protein adhesive so that the adhesive content in the plywood could be reduced greatly. The impact of plasma treatment on surface wettability of poplar veneer and bonding strength of plywood made of poplar veneers and the nanocrystalline cellulose （NCC） modified soy protein adhesive were investigated. The results showed that after the atmospheric pressure plasma treatment, the initial contact angle and the equilibrium angle of the resin in the veneer surface decreased by 12.4% and 46.3%, respectively, com- pared with those of the untreated veneers, indicating that the wettability of the poplar veneer was obviously improved. A certain amount of adhesive content was reduced when achieving type II plywood bonding performance. The surface roughness of the modified veneers and the content of oxygen-containing functional groups increased, which were bene- ficial to the wetting of the adhesive on the veneer surface. The optimized plasma treatment conditions were the treat- ment power of 4.5 kW and treatment rate of 14 m/min. It was concluded that the atmospheric pressure plasma treat- ment can improve the wettability of poplar veneer and the bonding strength between poplar veneer and NCC-modified soy protein adhesive remarkably, leading to the wet shear strength of the plywood meeting the Chinese National Stand- ard for type Ⅱ plywood at a lower single side adhesive content of 140 g/m2.

关 键 词：常压等离子体处理 杨木单板 润湿性 大豆蛋白胶黏剂 

分 类 号：S781[农业科学—木材科学与技术]