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High Performance Kenaf Fiber Reinforced Plastics by Surface Modification and Recycling Method

通过表面改性和回收方法制备高性能洋麻纤维增强塑料

基本信息

批准号：
14580582
负责人：
SEMBOKUYA Hideki
金额：
$ 2.3万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14580582/
关键词：
Natural fiber Kenaf Composite Material Plastic Recycle Surface treatment

项目摘要

Kenaf fiber was collected from the kenaf, Hibiscus cannabinus L. in order to use the reinforcing fiber of FRP. Mechanical properties of kenaf FRP and recycling methods were investigated.The bast (skin) of kenaf stem was treated in 5wt% sodium hydroxide solution at 80℃. Kenaf fiber was obtained after neutralization, washing, and drying. Two types of kenaf fiber were prepared ; 5 mm length short fiber for random orientation FRP and continuous fiber for unidirectional FRP. In the case of long fiber, preforms were fabricated by arranging bundles of long fiber in one direction and pressing. The preforms were impregnated by unsaturated polyester resin and then cured. Three point bending tests of kenaf FRP were carried out to evaluate flexural strength and modulus.The fiber content limit was 30wt% for random orientation FRP. The strength and modulus of FRP decreased in the low fiber content region and they recovered by filling more fibers. In the case of unidirectional long fiber FRP, the fiber content could be 50wt%. The flexural strength of unidirectional FRP was 3 times as large as that of neat resin. The flexural modulus was 5 times.The silane treated kenaf was used in order to improve the interfacial bonding. In the low content region, the treatment was effective. On the other hand, the properties of treated kenaf FRP were not improved remarkably in the high content region.Chemical decomposition of kenaf FRP was tried by using alkaline solution for the purpose of recycling. It was difficult to decompose sufficiently to low molecular weight. Then, crushed particles of kenaf FRP was used as filler of kenaf FRP as material recycling. The mechanical properties of recycled kenaf FRP could be stated good in general by optimizing the constitution of laminates.

从红麻中提取红麻纤维，以利用玻璃钢增强纤维。对红麻纤维增强塑料的力学性能和回收方法进行了研究。用5wt%的氢氧化钠溶液在80℃下对红麻树干韧皮进行处理。红麻纤维经中和、洗涤、干燥后得到红麻纤维。制备了两种红麻纤维：5 mm长度的随机取向纤维和连续纤维。在长纤维的情况下，预制件是通过在一个方向上排列长纤维束并压制而成的。预制件用不饱和聚酯树脂浸渍后固化。对红麻纤维增强塑料进行了三点弯曲试验，测试了纤维含量为30wt%的随机取向红麻纤维增强塑料的弯曲强度和弹性模量。在纤维含量较低的区域，玻璃钢的强度和模数有所下降，随着纤维填充量的增加，强度和模数有所恢复。在单向长纤维玻璃钢的情况下，纤维含量可达50wt%。单向玻璃钢的弯曲强度是纯树脂的3倍。经硅烷处理后的红麻纤维具有良好的界面粘结性能。在低含量区，处理是有效的。另一方面，红麻纤维增强塑料在高含量区性能改善不明显，尝试用碱性溶液对红麻纤维进行化学分解，以回收利用。它很难充分分解到低分子量。在此基础上，将红麻玻璃钢粉碎颗粒作为红麻玻璃钢的填料进行原料回收。通过优化层压板的组成，可以看出再生红麻玻璃钢的力学性能总体上是好的。