Abstract:

Sugar can bagasse(SCB)was mechanically activated by a self-made stirring-type ball mill. The effects of dosage of aluminate ester and activation time on the activation grade, contact angle of modified SCB and viscosity of SCB/paraffin oil system were investigated. In addition, the crystal structure and functional groups of bagasse were characterized by X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR).The results showed that after modification with aluminate ester, the activation grade and contact angle of SCB increased, while viscosity of SCB/paraffin oil system decreased.  The optimal effect was achieved when the dosage of aluminate ester was 3% of SCB. It was found that the reaction of SCB and aluminate ester was strengthened obviously by mechanical activation. The activation grade and contact angle of mechanically activated SCB increased obviously, and the viscosity of activated SCB/paraffin oil system decreased greatly after modification with aluminate ester. The optimal mechanical activation time was 120 min. After modification with aluminate ester, the dispersion of SCB in organic phase increased greatly, and the effect of mechanically activated SCB modified with aluminate ester became more remarkable. XRD analysis showed  that mechanical activation decreased the degree of crystallinity of cellulose, made it more accessible to aluminate ester, and improved the reactivity of cellulose. FTIR analysis showed that chemical reaction of the hydroxy group on the surface of SCB and the alkoxyl group of aluminate ester took place during the modification, forming a new chemical bond Al—O—C, and a molecule layer of aluminate ester was also formed on the surface of SCB.

Key words: 甘蔗渣, 机械活化, 铝酸酯, 活化度, 接触角, 分散性

摘要：

采用自制搅拌球磨机对甘蔗渣进行机械活化预处理，以改性甘蔗渣的活化度、润湿接触角及甘蔗渣/液体石蜡体系黏度为评价指标，分别研究了铝酸酯用量和机械活化时间对甘蔗渣改性效果的影响，并采用XRD、FTIR对甘蔗渣和改性产物进行了表征。研究结果表明：经铝酸酯处理后甘蔗渣的活化度、接触角增加，与液体石蜡体系的黏度降低，当铝酸酯用量为3%时效果最佳；机械活化明显强化了甘蔗渣与铝酸酯的反应，铝酸酯改性机械活化甘蔗渣的接触角和活化度明显增加，与液体石蜡组成的体系黏度降低，当机械活化120 min时效果最佳；甘蔗渣经表面偶联改性后，在有机相中的分散性明显增加，铝酸酯改性机械活化甘蔗渣效果更为显著；X射线衍射分析表明，机械活化降低了甘蔗渣纤维结晶度，提高了其对铝酸酯的反应活性；FTIR分析表明，甘蔗渣表面的羟基与铝酸酯中的烷氧基团发生化学反应，有新的官能团Al—O—C产生，并在甘蔗渣表面形成一层铝酸酯分子层。

关键词: 甘蔗渣, 机械活化, 铝酸酯, 活化度, 接触角, 分散性