2-羟基-3-磺酸基丙基淀粉醚的合成与性能

SYNTHESIS AND PRORERTIES OF 2-HYDROXY-3-SULFOPROPYLSTARCH AS FILTRATION-LOSS CONTROLLER FOR DRILLING FLUIDS

以工业玉米淀粉为原料,在氢氧化钠存在下,以3-氯-2-羟基丙磺酸为醚化剂合成了2-羟基-3-磺酸钠基丙基淀粉醚。室内配浆试验表明,所得产品在淡水、盐水和饱和盐水泥浆中均具有良好的降失水作用。当加量为0.7％时,可使淡水和盐水泥浆的失水分别由原浆的23.5和76ml降至6.5和7.3ml;加量为1.5％时可使饱和盐水泥浆的失水由原浆的146ml降至7ml以下,其降失水能力受CaCl_2的影响小,在饱和盐水抗盐(土殷)土浆中,即使CaCl_2加量达到10％,泥浆的失水仍保持较低的值(<7ml)。

2-Hydro-3-sulfopropylstarches (HSPS) of different degree of substition(0.15-0.35) is synthesized by etherification of commercial corn starch with 3-chloro-2-hydropropylsulfonic acid. The conditions of the synthesis are discussed. In laboratory tests with the products synthesized, the filter-loss of fresh and salt water muds treated by 0.7% HSPS are decreased from 23.5 and 76 to 6.5 and 7.3ml, respectively} 1.5% HSPS has reduced this characteristics of saturated salt water mud from 146 to less than 7ml. HSPS is highly tolerent to calcium and can maintain the filter-loss of saturated salt water trtud containing 10% CaCl_2 less than 7ml.