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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。
Using the advantages of microwave radiation polymerization, 2-acrylamido-2-methylpropane sulfonic acid (AMPS) was introduced into the synthesis of acrylic resin to improve the salt tolerance of the product. 2-acrylamido-2-methylpropanesulfonic acid (AMPS) / acrylamide (AM) / acrylic acid (AA) salt-tolerant superabsorbent was synthesized by microwave irradiation and characterized by FTIR. Microwave power, concentration of inorganic salt solution, ionic valence, temperature, pH and other factors on the liquid absorption properties of the resin. The results showed that the water absorption capacity of resin decreased significantly with the increase of salt concentration, and the water absorption capacity was related to the valency of cation. The order of its size was NaCl> CaCl2> FeCl3. The same concentration of monovalent cation salt solution, the resin’s water absorption capacity quite. The introduction of anionic monomer increases the salt tolerance of the resin. Water absorption ratio in the inorganic salt solution with the temperature increased slowly and then gradually reduce the trend, while in distilled water showed a downward trend; water absorption ratio with the buffer solution pH also increased first and then decreased .