微晶纤维素填充半硬质聚氨酯泡沫塑料的制备

Preparation of microcrystalline cellulose filled semi-rigid polyurethane foam

利用模塑成型方法,在聚氨酯泡沫塑料中加入了易于生物降解的微晶纤维素,制备了不同填充量的外观和力学性能较好的半硬质聚氨酯泡沫塑料(SRPUF),研究了微晶纤维素用量对其力学性能的影响,确定了微晶纤维素在SRPUF中的最大填充量。结果表明:微晶纤维素的最大填充量为40 phr(质量分数为11.7%),微晶纤维素的加入使SRPUF的拉伸强度和拉断伸长率升高,且当含量分别为30,10 phr时达到最大值。微晶纤维素用量越大,降解时间越长,试样在土壤中的降解性越好,最大填充量试样降解120天后质量损失率可达5.84%。

Semi-rigid polyurethane foams（SRPUF） with good appearance and mechanical properties containing different filler contents were prepared by adding easy-biodegradable microcrystalline cellulose in polyurethane foams via molding process.Effects of the filler content on the mechanical properties of polyurethane foams were studied,and the largest filler content was determined.The results show that the largest content of microcrystalline cellulose reaches 40 phr（mass percentage of 11.7%）.The tensile strength and the elongation at break of SRPUF increase with the addition of microcrystalline cellulose and reach the maximum when the filler content is 30,10 phr respectively.The higher the filler content and the longer the degradation time is,the better degradability SRPUF has with soil burial.The mass loss of SRPUF with the largest filler content is up to 5.84%after 120 days.