摘要
为改善黄原胶产生鱼眼与溶解速率小的问题，以有机金属配合物COMe为改性剂、二甲苯为分散介质，利用界面修饰法进行了黄原胶的分散改性。通过正交实验优化了分散型黄原胶（Disperse XC）的制备条件，采用红外光谱对其分子结构进行了表征，考察了Disperse XC的分散性、流变性和溶解性。研究结果表明，制备Disperse XC的最佳工艺参数为：10 g原料黄原胶XC、0.09 g COMe和4.5 g蒸馏水，用柠檬酸调整pH值约为4.5。红外表征结果表明，改性后黄原胶分子结构未发生变化，但分子间氢键作用力减弱。Disperse XC粉末在35 min内完全溶解于模拟海水中，无鱼眼产生，分散液的表观黏度为19.5 mPa?s。Disperse XC的流变性与原料黄原胶XC相当，分散性和溶解速率均优于国产分散型黄原胶XCD。图2表3参17
Abstract
To avoid lumps and accelerate the dissolution of xanthan gum in water, surfaces of xanthan gum particles were modified in dimethylbenzene with organometallic complex COMe. The preparation condition of dispersible xanthan gum (Disperse XC) was optimized by orthogonal experiment, and its molecular structure was characterized by IR. The dispersibility, rheological property and solubility of Disperse XC were studied. The results showed that the optimum reaction condition of Disperse XC was obtained as follows: 10 g xanthan gum, 0.09 g COMe and 4.5 g distilled water, and the pH value was about 4.5 adjusted by citric acid. Testing result of IR showed that the molecular structure of xanthan gum didn’t change after modification, while the hydrogen bonding between xanthan gum molecuars weakened. Disperse XC powders completely dissolved in simulated seawater in 35 min without lumps, and the apparent viscosity of Disperse XC solution was 19.5 mPa?s. The rheological property of Disperse XC was similar with that of XC, dispersibility and solubility of Disperse XC were better than that of XCD.
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