单宁树脂砂轮片制备及氧化铝在树脂中的分形分布  

Preparation of tannin-based grinding wheels and fractal distribution of aluminum oxide in the resin

作　　者：张俊[1,2] 杜官本[2] 席雪冬[2] 

机构地区：[1]北京林业大学材料科学与技术学院,北京100083 [2]西南林业大学,云南省木材胶黏剂及胶合制品重点实验室,昆明650224

出　　处：《林业工程学报》2016年第1期88-92,共5页Journal of Forestry Engineering

基　　金：云南省国际合作项目(2014IA017);云南省教育厅自然科学基金重点项目(2013Z087);“十二五”国家科技支撑计划(2012BAD24B03)

摘　　要：以杨梅树皮单宁-糠醇共缩聚树脂为基质,氧化铝颗粒为研磨材料,在实验室条件下制备新型可回收砂轮片。采用扫描电子显微镜、布氏硬度、抗压强度以及耐磨测试对砂轮片的外观及强度进行评估,同时通过氧化铝颗粒在树脂中的分布特征,并根据分形理论,采用分形维数来描述其对固化后砂轮片的压缩性能的影响。结果表明:用占树脂质量1.5倍的氧化铝制备的砂轮片,不仅具有光滑无裂痕的表面、高硬度和高抗压强度,还具备优越的耐磨性能。同时,氧化铝颗粒在树脂中的分布具有分形特征,不同的氧化铝含量会在树脂中形成不同的分形维数,砂轮片呈现不同的粗糙度。A 100% renewable, easy-to-prepare and industrialized grinding wheel was developed based on a bio-basedthermosetting resin matrix. The matrix was made of hairy waxmyrtle tannin-furanic resin, which bonded the aluminum ox-ide particles as abrasive substance. Scanning electron microscopy （SEM） was used to study the appearance of thesegrinding wheels. The mechanical properties of the wheels were characterized by the measurements of compressivestrength, Brinell hardness and wear resistance. Meanwhile, through investigating the distribution characteristics of alumi-num oxide particles in the resin, the effect of particles on the compressive strength of the grinding wheels were investiga-ted according to fractal theory using the computer-aided design （CAD）. The results showed that the grinding wheels pre-pared by the tannin-furanic resin matrix and aluminum oxide particles exhibited good surface quality with no cracks orpores. They also showed high hardness and compressive strength. The grinding wheel with an aluminum oxide particle-to-resin mass ratio of 1.5 showed the highest hardness and compressive strength. The results also revealed remarkable per-formance of wear resistance compared to the commercial Taber Calibrade wheel H-18. Moreover, the distribution of alu-minum oxide particles in the resin matrix exhibited a fractal character. There was different fractal dimension and rough-ness of grinding wheel surface with different amount of aluminum oxide particles. With the increase of aluminum oxideparticles, the fractional dimension in the surface of the grinding wheel increased. When the mass ratio of aluminum oxideparticles to tannin-furanie resin was 2, the fractional dimension was the highest.

关 键 词：单宁一糠醇树脂 氧化铝颗粒 分形特征 新型砂轮片 

分 类 号：TQ321.2[化学工程—合成树脂塑料工业]