杨木单板的表面改性与胶合效应  

SURFACE MODIFICATION OF POPLAR VENEER AND ITS BONDABILITY

作　　者：李华[1] 申宗圻 

机构地区：[1]北京林业大学森工系

出　　处：《林业科学》1990年第3期247-253,共7页Scientia Silvae Sinicae

摘　　要：本项研究是就杨木单板的表面改性,探讨其对胶合性能等的影响。试验利用特制的水溶性三聚氰酰胺系化合物BL-M做表面改性剂/桥连剂,它既能与未材表面的羟基产生交联反应,又能与脲醛树脂反应,在木材与胶粘剂之间架桥。试验结果证明,通过交联与桥连反应提高了杨木胶合板的胶合强度,减少用胶量25—30％,并且还抑制和克服了杨木由于存在胶质纤维而在材面土产生起毛的弊病。在胶合板生产中,这种表面改性方法是在技术上和经济上完全可行的简便方法。Wood surfaces are very heterogeneous in nature and variable in the degree of roughness and porosity due to cutting of wood cells. They are usually in a dynamic state, changing with their environmental conditions. The wood surface properties or characteristics will thus inevitably subject to the effect of bondability. So the modification of veneer surface becomes an improtant research problem in the area of wood procession. In this investigation, poplar wood veneers were treated with a specially prepared water soluble melamine compound BL-M expected to be acting as a surface modifying/bridging agent. BL-M not only can crosslink to the hydroxyl groups on the wood surface but also can act with the urea-formaldehyde forming a bridge between the wood surface and the glue. Expermental resuits reveal ed that the gluing strength was found obviously enhanced, the quantity of adhesive applied was reduced about 25-30％ and the formation of fuzzy grain on poplar wood surface was greatly checked. The application of this wood surface modification method would be expected to be feasible both technically and economically in the manufacturing of plywood.

关 键 词：杨木单板 表面改性 胶合效应 

分 类 号：TS653.2[轻工技术与工程]