烷基烯酮二聚体改性瓜尔胶的制备及应用

Preparation and Application of Alkyl Ketene Dimmer Modified Guar Gum

关键词:  瓜尔胶  烷基烯酮二聚体  施胶度

Key Words:guard gum  alkyl ketene dimmer  surface sizing

摘要:结合烷基烯酮二聚体（AKD）的疏水性与瓜尔胶的亲水性能，利用AKD的内酯基与瓜尔胶原粉上活性羟基发生酯化反应，得到了具有一定施胶度的新型表面施胶剂。将改性后的瓜尔胶配制成一定浓度的施胶液对纸张进行表面施胶，并测定了其施胶效果。讨论了瓜尔胶与AKD的反应温度、反应时间、改性瓜尔胶进行表面施胶时的用量等对施胶效果的影响。同时用扫描电镜（SEM）、红外光谱(FT-IR)和接触角仪(CA)等测量手段对其结构、性能和应用效果进行了表征。结果表明，当瓜尔胶原粉与AKD质量比为2∶1，反应温度为70℃，反应时间4 h时，在瓜尔胶分子上成功接枝了烃基长链，改性瓜尔胶表面施胶用量为0.6%时，纸张的施胶度可以达到52 s。

Abstract:The lactone group of AKD and the activated hydroxyl of guar gum was esterified and produce a new surface sizing agent with alkyl ketene dimmer (AKD)s hydrophobicity and guar gums hydrophilicity. The guar gum modified by AKD was dissolved in ethanol without water. Paper surface sizing with the modified guar gum was carried out and the application result was measured. The effect of reaction temperature and reaction time in the modified guar gum preparation as well as the dosage of modified guar gum on sizing efficiency were discussed. The modified compound was characterized by the SEM, FT-IR. Stability experiment showed that when the ratio of the guar gum and AKD is 2∶1, reaction temperature is 70℃, reaction time is 4 h, the AKD can be grafted on the guar gum successfully. The sizing degree is 52 s when the dosage of the modified guar gum is 0.6%.