CAJ | 학술논문

探讨了氧化铁颜料对木纤维-高密度聚乙烯复合材耐老化性能的改善作用.采用四种常用的氧化铁颜料与木纤维、高密度聚乙烯和其他加工助剂干混,并用自行设计的双螺杆/单螺杆双阶挤出机组制造木塑复合材料.对该木塑复合材料进行人工加速紫外循环老化处理,用CIE 1976 L~*a~*b~*表色体系和ASTM D790标准分别对老化前后的材料进行测试,结果显示加入颜料以后木塑复合材料的抗弯弹性模量没有明显的变化,但是弯曲强度都有一定程度的提高.经过2000h人工加速紫外老化以后, 不论是颜色要是力学性能都发生了明显的变化.铁红和铁黑着色的试样在整个老化过程中表现较好,颜料添加量约2.28%比较适宜.
탐토료양화철안료대목섬유-고밀도취을희복합재내노화성능적개선작용.채용사충상용적양화철안료여목섬유、고밀도취을희화기타가공조제간혼,병용자행설계적쌍라간/단라간쌍계제출궤조제조목소복합재료.대해목소복합재료진행인공가속자외순배노화처리,용CIE 1976 L~*a~*b~*표색체계화ASTM D790표준분별대노화전후적재료진행측시,결과현시가입안료이후목소복합재료적항만탄성모량몰유명현적변화,단시만곡강도도유일정정도적제고.경과2000h인공가속자외노화이후, 불론시안색요시역학성능도발생료명현적변화.철홍화철흑착색적시양재정개노화과정중표현교호,안료첨가량약2.28%비교괄의.
Four kinds of iron oxide pigments were added into wood-fiber/high-density-polyethylene composites (WF/HDPE) at three different concentrations, to determine the effects of pigments on the changes in the color and mechanical properties of the composites before and after UV accelerated weathering. HDPE, wood fibers, pigments and other processing additives were dry-mixed in a high-speed mixer. The mixtures were extruded by two-step extrusion process with a self-designed twin-screw/single-screw extruder system. Color of the samples was determined according to CIE 1976 L~*a~*b~* system by a spectrophotometer and the bending properties were tested to evaluate the mechanical properties before and after accelerated UV weathering. The result shows that the modulus of elasticity of WF/HDPE did not obviously changed after incorporating with the pigments, but the bending strength increased. After accelerated aging for 2000 h, both color and mechanical properties significantly changed. Iron oxide red and black performed better than the other two pigments, and the pigments dosage of 2.28% in the composites is favourable.