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Preparation and Application of Alkyl Ketene Dimmer Modified Guar Gum
  
DOI：10.11980/j.issn.0254-508X.2011.09.006
Key Words:guard gum  alkyl ketene dimmer  surface sizing
Fund Project:基金项目：国家自然科学基金（20876093）;陕西省教育厅科研专项（2010JK436）。
Author NameAffiliation
薛　贝 陕西科技大学教育部轻化工助剂化学与技术重点实验室，陕西西安，710021 
沈一丁 陕西科技大学教育部轻化工助剂化学与技术重点实验室，陕西西安，710021 
杨晓武 陕西科技大学教育部轻化工助剂化学与技术重点实验室，陕西西安，710021 
李培枝 陕西科技大学教育部轻化工助剂化学与技术重点实验室，陕西西安，710021 
隋明炜 陕西科技大学教育部轻化工助剂化学与技术重点实验室，陕西西安，710021 
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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%.
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