阳离子瓜尔胶的制备及其在卷烟纸中的应用研究

Preparation of cationic guar gum and its application in cigarette paper

关键词:  瓜尔胶  甜菜碱  助留剂  卷烟纸

Key Words:guar gum  betaine  cigarette paper  retention

摘要:本研究以甜菜碱酰氯为阳离子化试剂，在吡啶催化作用下对瓜儿胶进行化学改性，成功制备了较高取代度阳离子瓜尔胶。结果表明，在优化反应条件（瓜尔胶与甜菜碱酰氯质量4:2，吡啶添加量8.5 wt%，反应温度80℃，时间2 h）下，制备的阳离子瓜尔胶取代度达0.098，且较好地保留了瓜尔胶的初始粘度。热重分析表明改性后的阳离子瓜尔胶热稳定性显著提升，扫描电镜结果显示其表面形成多孔结构，证实反应在瓜尔胶表面及内部均匀进行。将阳离子瓜尔胶应用于卷烟纸生产时，填料的助留效率随阳离子瓜尔胶用量增加而提高，当用量为0.15 wt%时填料留着率最高高56.7%，且卷烟纸中铬元素含量为1.52 mg/kg，符合国家安全标准。本研究为瓜尔胶绿色改性及功能化应用提供了新策略，具有重要工业价值。

Abstract:In this study, relatively high-substitution-degree cationic guar gum was successfully prepared by chemically modifying guar gum using betaine acyl chloride as a cationic reagent under pyridine catalysis. The results showed that under optimized reaction conditions (guar gum to betaine acyl chloride mass ratio of 4:2, pyridine dosage of 8.5 wt%, reaction temperature of 80°C, and time of 2 h), the degree of substitution of the cationic guar gum reached 0.098, while the initial viscosity of guar gum was well retained. Thermogravimetric analysis demonstrated a significant improvement in the thermal stability of the modified cationic guar gum. Scanning electron microscopy revealed a porous structure on its surface, confirming that the reaction occurred uniformly both on the surface and within the guar gum matrix. When applied to cigarette paper production, the filler retention efficiency increased with the dosage of cationic guar gum. At a dosage of 0.15 wt%, the filler retention rate peaked at 56.7%, and the chromium content in the cigarette paper was 1.52 mg/kg, complying with national safety standards. This study provides a novel strategy for the green modification and functional application of guar gum, demonstrating significant industrial value.