9,10,12,13-四羟基硬脂酸钠在低温硬质水及中性pH条件下的特异性能

以天然亚油酸为原料,经氧化水解制备得到9,10,12,13-四羟基硬脂酸(THSA),采用FTIR、ESI-MS和1HNMR表征了THSA的结构。测定了THSA的钠皂9,10,12,13-四羟基硬脂酸钠(STHS)的克拉夫特点、钙离子稳定性、钙皂分散剂消耗量、表面张力、临界胶束浓度和泡沫性能,并与对照物亚油酸、油酸及硬脂酸的钠皂进行比较。结果表明,STHS具有其他脂肪酸钠皂不具备的优秀钙皂分散性能和钙离子稳定性,并在低温和中性条件下显示出更好的水溶性。STHS不仅克服了普通脂肪酸钠皂不耐硬水和中性条件下溶解性差两大共同缺陷,也克服了饱和脂肪酸钠皂低温溶解性差以及不饱和脂肪酸钠皂易氧化酸败的缺点,因此,STHS具有在中性皂、低温皂和抗硬水皂配方中用作新皂基表面活性剂的潜质。

Unique Physicochemical Properties of Sodium 9,10,12,13-Tetrahydroxyl Stearate in Cold or Hard Water and at Neutral pH condition

9,10,12,13-Tetrahydroxyl stearic acid (THSA) was synthesized from natural linoleic acid by oxidation and hydrolysis, and the molecular structure was identified by FT-IR, ESI-MS and 1H-NMR. Sodium tetrahydroxyl stearate (STHS) thus was prepared from THSA by saponification, and Krafft point, calcium ion stability, lime soap dispersant requirement, surface tension, critical micelle concentration and foam properties of THSA were investigated and compared with those of sodium soaps of linoleic acid, oleic acid and stearic acid. The experimental results showed that STHS displayed unique lime soap dispersing power and calcium ion stability in hard water, and better solubility in cold water and at neutral pH condition superior to all the other tested sodium soaps. The polyhydroxyl characteristics give STHS the power to easily dissolve not only in hard water and at neutral pH condition against ordinary sodium soaps of all other fatty acids, but also in cold water against sodium soaps of saturated fatty acids, and inoxidizability against sodium soaps of unsaturated fatty acids. Therefore, STHS has the potential to act as the new soap-base surfactant formulating of neutral soaps, cold water soaps and hard water soaps.