磺酸基羟丙基瓜尔胶的制备和性能

以3-氯-2-羟基丙磺酸钠,瓜尔胶原粉为原料,在碱性催化剂作用下采用湿法合成了磺酸基羟丙基瓜尔胶.讨论了外加盐、酸度、取代度和不同浓度的瓜尔胶水溶液对磺酸基羟丙基瓜尔胶流变曲线的影响,并通过红外光谱,扫描电镜,核磁图谱,XRD等进行了分析.结果发现,随着外加盐浓度的增大,表观黏度逐渐减小,表现出明显的聚电解质的通性,A...

PREPARATION AND PROPERTIES OF SULFONIC ACID HYDROXYPROPYL GUAR GUM

Sulfonic acid hydroxypropyl guar gum(SHGG) was prepared in laboratory by a wet process based on the reaction of guar gum and sodium 3-chloro-2-hydroxy propanesulfonate with an alkali catalyst.The effects of SHGG aqueous solution,including electrolyte added,acidity,substitution degree and concentration on the rheology properties of SHGG were investigated.The structure of the guar gum product was characterized by IR,SEM,NMR,XRD,and DSC.The results showed that SHGG aqueous solution had the behaviors of typical polymerizing-electrolyte.Additionally,the effect of the high metal ion was bigger than that of low metal ion: AlCl3>MgCl2>NaCl.The viscosity of SHGG aqueous solution decreased with increasing the concentration of electrolyte.With the acidity increased,the apparent viscosity reached the maximum about pH 7.0,and then decreased slightly,showing that the sensibility of SHGG aqueous solution to acid is more pronounced than that to alkali.The insoluble residue and the apparent viscosity reduced following the substitution degree increased.When the substitution degree was greater than 0.3,the tendency became gentle.The apparent viscosity decreased with increasing the shearing rate.