木粉酯化改性制备生物基塑料

Modification of Wood Powder by Esterification for the Production of Bio-based Plastic Material

以胡桑枝条木粉为原料制备木质纤维类生物基塑料,木粉先经过球磨预处理后,在二甲亚砜(DMSO)分散介质中,以邻苯二甲酸酐(PA)为改性试剂,4-二甲氨基吡啶(DMAP)为催化剂对其进行酯化改性,并考察了反应温度、时间和试剂用量对改性产物质量增长率及材料力学性能的影响。研究结果表明,以木质纤维为原料,可以成功制备注塑级的生物基塑料,实现木质纤维原料全组分的高效利用。在最佳工艺条件下,经改性制备材料的质量增长率为98.8%,熔融指数0.903 g/min,其拉伸和弯曲强度分别达到24.1和41.9 MPa,具有较好的热塑性和力学性能。

Mulberry branches wood powder was used as the raw material for preparation of bio-based plastic material. After ball milling, wood powder was first esterified by phthalic anhydride （PA） using 4-dimethylaminopyridine （DMAP）as the catalyst in dimethyl sulfoxide （DMSO） as the dispersion medium. The effects of temperature, time and the weight of reagents on weight percent gain（ WpG ）and mechanical property of modified production were studied. The results showed that esterified lignocellulosic material could be used as bio-based plastic injection molding product with whole components. Under the optimum conditions, the mass growth rate and melt index of the modified product were 98.8% and 0.903 g/min, respectively, and the modified product was found with good thermoplastic and mechanical properties with the tensile strength of 24.1 MPa and the flexural strength of 41.9 MPa.