再生纤维素纤维的鉴别方法研究

Study on Identification Method of Regenerated Cellulose Fiber

通过选用5种碱性强度不同的碱液组成碱剂梯度,研究不同纤维的膨胀规律,建立一系列膨胀性能与纤维种类的对应关系。通过研究发现,再生纤维素纤维在碱性较弱的碱液中膨胀率较小,无法作为鉴别的有效依据。进一步研究对再生纤维素纤维有较大膨胀率的烧碱溶液,从浸渍时间和碱液浓度,发现了可供鉴别的碱液浓度及膨胀规律:70g/L烧碱溶液中,铜氨纤维和莫代尔纤维(含台化莫代尔纤维)膨胀率≥350%,莱赛尔纤维的膨胀率≤250%;100g/L碱液中,铜氨纤维的膨胀率≥550%,莫代尔纤维和莱赛尔纤维膨胀率≤450%,且莫代尔纤维在碱液中边缘模糊,有部分裂痕,莱赛尔纤维边缘清晰,纤维完整。

By selecting five kinds of alkali liquor with different alkaline strength,the expansion law of different fibers was studied,and a series of corresponding relations between expansion properties and fiber types were established.It was found that the expansion rate of regenerated cellulose fiber in weak alkaline solution was small,which couldn′t be used as an effective basis for identification.The caustic solution with high expansion rate for regenerated cellulose fiber was further studied.The alkali concentration and expansion law could be obtained from the soaking time and the alkali concentration.In 70 g/L caustic soda solution,the expansion rate of cuprammonia fiber and Modal fiber(including Taihua Modal fiber)was greater than or equal to 350%,and the expansion rate of Lyocell fiber was less than or equal to 250%.In 100 g/L alkali liquor,the expansion rate of cuprammonium fiber was more than 550%,the expansion rate of Modal fiber and Lyocell fiber was less than or equal to 450%,and the edge of Modal fiber was fuzzy and there were some cracks.The edge of Lyocell fiber was clear and the fiber was complete.