羟丙基淀粉的合成及其降滤失性能研究

The Preparation and Low Fluid Loss Performance of Hydroxypropyl Starch

摘要:

摘要：探讨半干法、溶剂法制备羟丙基淀粉（HPS）的工艺条件，并分析比较了其降滤失性能。实验发现，半干法制备工艺是一种理想的工艺，适宜的反应条件是：反应温度55 ℃，反应时间8 h，m(NaOH)/m(淀粉)为0.014，m(环氧丙烷)/m(淀粉)为0.30，体系水含量31%，该条件下得到摩尔取代度（MS）为0.33的产品。半干法产品用量为1%在4%（均为质量分数）盐水泥浆中可抗温至150 ℃，而溶剂法产品仅抗温至140 ℃。在抗盐抗钙镁能力方面，半干法产品也表现出较大的优势，在140℃下抗盐至饱和，比溶剂法产品提高20%，抗钙至930 mg/L、抗镁至360 mg/L。进一步探讨了HPS的摩尔取代度与其降滤失性能的关系，当产品的摩尔取代度高于0.2时，产品具有较好的降滤失性能，产品的降滤失性能与其摩尔取代度以及合成工艺有关。

Abstract:

bstract：The preparation techniques of hydroxypropyl starch(HPS) by half-dry method and solvent method were introduced, and the low fluid loss performance was studied and compared. The result shows that half-dry method was a good method. The optimum reaction conditions were as follows: reaction temperature 55℃, reaction time 8h, the ratio of m(sodium hydroxide) to m(starch) 0.014, the ratio of m(propylene oxide) to m(starch) 0.30, water content in reaction system 31%, The MS of product is 0.33. The product could resist temperature up to 150℃ in 4% NaCl salt water muds, while the product made by solvent method only to 140℃. Compared with solvent method product at 140℃, it has excellent capacities of salts , and could be used in saturated-salt solution, the maximum content of Ca2+ and Mg2+ was 930mg/L and 360mg/L, respectively. Further studies show that the product had a good low fluid loss performance when MS is over 0.2. The fluid loss performance of HPS is related to the MS and the synthesis process.