碱脲体系对麦草APMP成纸强度的影响研究

Study on effects of alkali urea system on paper strength of wheat straw APMP

将麦草碱性过氧化氢机械浆(APMP)于氢氧化钠-硫脲溶液中处理以求提高其成纸强度,并利用纤维质量分析仪、FT-IR、XRD和SEM检测处理前后纤维微观形态及官能团的变化情况。结果表明,在用碱量6%、纤维质量分数15%、冷冻时间50min的条件下,该溶液体系对麦草APMP的成纸强度增加效果显著,和未处理APMP相比,处理后APMP成纸强度提高近60%。同时处理前后纤维的红外光谱图、X射线衍射谱图和扫描电镜图片均变化不显著,但处理后APMP纤维表面出现轻微破损及细小纤维含量提高。

The wheat straw APMP was treated with the NaOH-thiourea aqueous solution to enhance its paper strength,and variations in the fiber microstructures and function groups before and after treatment of APMP were tested by use of the fiber quality analyzer,FT-IR,XRD and SEM.According to the tests,the optimal condition was chosen with 6% alkali concentration,15% fiber mass fraction,and 50 min freezing time.Compared to untreated APMP,paper strength of treated APMP could be increased by approximately 60%,and there were no obvious variations in the structures of function groups or crystalline regions and the overall morphology of fibers.However,there were slight damages to the surface of treatedfiber,and the content of fiber fines was increased significantly.