落叶松改性栲胶溶液及凝胶性质研究

A STUDY OF PROPERTIES OF SOLUTION AND GEL FORMED WITH MODIFIED LARCH TANNIN EXTRACT

本文报道落叶松改性栲胶溶液及凝胶性质的研究结果。磺化改性栲胶比未改性栲胶有较好的水溶性和耐盐能力，配成的堵剂溶液粘度较低，成胶时间主要受温度、pH值和缓凝剂浓度的影响。改性栲胶堵剂溶液的耐盐能力有限（NaCl浓度超过8％时便沉淀分相），但形成的凝胶可耐20％NaCl＋1.5％CaCl2盐水的侵蚀，且具有很高的强度。

This paper presents the results of investigating the properties of solution and gel of modified (sulfonated) larch tannin extract. Sulfonated larch tannin extract (SLTE) has better water solubility and salts tolerency, and lower solution viscosity, than unmodified one does. The gelation time of a SLTE gelling solution is influenced mainly by the temperature, the pH value and the amount of gelation retarder added. SLTE galling solution is not very tolerent to salts and precipitation occurs at NaCl concentration＞8%. The gel formed, however, is rather stable in 20% NaCl+1. 5 % CaCl2 solution and strong.