瓜尔胶的改性及其透光性能研究  

Modification of Guar Gum a nd Study of Transmittance

作　　者：李聪暖[1] 罗儒显[1] 

机构地区：[1]五邑大学化学与环境工程学院,广东江门529020

出　　处：《广东化工》2012年第7期30-32,共3页Guangdong Chemical Industry

摘　　要：瓜尔豆片为原料，经羟丙基提纯后阳离子改性，得到透明性较好的阳离子瓜尔胶（CGG）。经分析碱法水解除蛋白质最优工艺为：豆片25g，NaOH5g，98℃下反应3h：蛋白质去除率为98．24％，透光率达77％。羟丙基化较优工艺为：环氧丙烷8mL。60℃反应4h；羟丙基取代度为0．2650，透光率为89％e阳离子化最优工艺为：醚化剂10mL，60℃反应3～5h，取代度（DS）为0．1701，透光率达97％。用IR对产蹦结构进行了表征，用TG和DSC对瓜尔胶、羟丙基瓜尔胶和阳离子瓜尔胶的对比研究表明，接枝的阳离子基团对瓜尔胶的相态稳定温度有影响，阳离予瓜尔胶的水分含量和结合水含量有所降低，利于储存。此产品用于对透光率要求较高的领域。Cationic guar gum（CGG）with perfect transparency was obtained by hydroxypropyl purification and then cationization modification on guar gum. The discarding protein technology factors by alkaline process were provided as follows： the mass of splits and sodium hydroxide were 25 g and 5 g, respectively, reaction temperature was 98 ℃, reaction time was 3 h. The removal rate of protein was 98.24 %, the luminousness was 77 %. The synthetic process technology factors of hydroxypropyl guar gum were provided as follows： the volume of epoxy propane was 8 mL, reaction temperature and reaction time were 4 h and 60℃, respectively. The degree of substitution was 0.2650, the luminousness was 89 %. The optimal synthetic process technology factors of cationic guar gum were as follows： the vohn-ae of etberifying agent was 10 mL, reaction temperature and reaction time were 3-5 h and 60 ℃, respectively. The degree of substitution （DS） of CGG was 0.170 1, the luminousness was 97 %. The chemical structure of CGG was characterized by IR. The contrast among guar gum, hydroxypropyl guar gum and Cationic guar gum was analyzed by TG and DSC. Cationic groups-grafting had influenced the morphology stable temperature of guar gum. The moisture and combined water of CGG are lower, so it can be preserved preferably, and used in fields with higher luminousness.

关 键 词：瓜尔豆片 碱法水解蛋白质:羟丙基瓜尔胶 阳离子瓜尔胶:透光率 

分 类 号：TQ423.2[化学工程]