微波辐射三元共聚高吸水树脂吸液性能研究

利用微波辐射聚合的优点,在丙烯酸类树脂的合成中引入2-丙烯酰胺基-2-甲基丙磺酸(AMPS)提高产品的耐盐性。采用微波辐射方法合成了2-丙烯酰胺基-2-甲基丙磺酸(AMPS)/丙烯酰胺(AM)/丙烯酸(AA)耐盐性高吸水树脂,并用红外光谱进行了表征分析;探讨了微波功率、无机盐溶液的浓度、离子价态、温度、pH等因素对树脂吸液性能的影响。结果表明,树脂的吸水倍率随着盐溶液浓度增加显著下降,吸水倍率与阳离子的价态有关,其大小顺序为NaCl>CaCl2>FeCl3。同浓度的一价阳离子盐溶液,树脂的吸水能力相当。引入阴离子单体提高了树脂的耐盐性。吸水倍率在无机盐溶液中随着温度的升高有先缓慢增大后逐渐减小的趋势,而在蒸馏水中呈下降趋势;吸水倍率随缓冲溶液pH的增大亦呈现先增高后降低的趋势。

Absorbency of the superabsorbent polymer synthesized by microwave irradiation with AMPS/AM/AA

In order to improve the salt-resistance of superabsorbent polymer, 2-acrylamido-2-methyl propane sulfuric acid (AMPS) was added in the chemical synthesis of acrylic resin. Poly (2-acrylamido-2-methylpropa- nesulfonic acid/acryl amide/acrylic acid) superabsorbent resin was synthesized by microwave irradiation, and characterized by Fourier transform infrared spectroscopy (FTIR). The effects of the microwave power, the concentration of inorganic salt solution, the ion valence, the temperature, pH to absorption properties of resin were discussed. The results showed that the absorbency decreased sharply with increasing of ionic strength and solution concentration .The absorbency was related to the valence state, and the order was NaCl > CaCl₂ > FeCl₃. The absorbency of the polymer was equal when the salt-solution was in the same one-position ion concentration. The salt-resistance of the polymer could be improved when added the negative monomer. The absorbency of the polymer which was in the inorganic salt solution was slowly increased at first and then gradually decreased when the temperature rose. The absorbency of the polymer was decreased when the polymer was in the distilled water. The absorbency of the polymer was increased at first and then decreased when pH of the buffer solution rose.