木质素磺酸铵的糖含量对无胶中密度纤维板性能的影响

Influence of Sugar Content of Ammonium Lignosulfonate on the Properties of Binderless Medium Density Fibreboard

木质素磺酸盐是由C6～ C3疏水骨架和磺酸根以及其他亲水性基团组成的一种三维网状高分子聚合物，其基本组分是苯甲基丙烷衍生物（严明芳等，2008），主要来源于亚硫酸法制浆废液，年产量巨大、价格低廉、无毒，是一种可再生资源。木质素磺酸盐具有良好的吸附分散性、表面活性、起泡性、螯合作用和黏结作用等表面物化性能（张东华，2005），其应用性能日益引起人们的关注。

This article mainly studied the influence of sugar content of ammonium lignosulfonate on the physical and mechanical properties of binderless medium density fibreboard. The purified ammonium lignosulfonate was prepared by alkali-solution and acid-isolation. The two different binderless medium density fibreboards （ OLF and PLF） were produced with wood fiber as basic phase and original ammonium lignosulfonate （ OL） and purified ammonium lignosulfonate （ PL） as filler by flat-press process. The phenol-sulfuric-acid method was used to determine the sugar content. The chemical composition,degree of crystallinity and microstructure were characterized by fourier transform infrared spectroscopy （FTIR）,X-ray diffraction （XRD） and scanning electron microscope （SEM）,respectively. The results showed that the sugar content of OLF was 22. 38%,while the sugar content of PLF was 13. 37%. The physical and mechanical properties of OLF were better than that of PLF. The result of FTIR showed that hydroxyl of PLF decreases obviously,which was that it didn＇t help the forming of hydrogen bond. The XRD result showed that the relative crystallinity of OLF is higher than that of PLF. The SEM showed that the components of the OLF distributed uniformly,and combined closely among wood fiber. These results told that the binderless medium density fibreboard with ammonium lignosulfonate with higher sugar content as binder possessed better physical and mechanical properties.