PAA-AMPS/HA/MMT吸水树脂的吸水性能及吸水动力学研究

Study on Water Absorption Performance and Water Absorption Dynamics of PAA-AMPS/HA/MMT Water Absorbent Resin

摘要: 以丙烯酸(AA)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、腐植酸(HA-K)及膨润土(MMT)为主要原料，采用反相悬浮聚合法，合成了复合保水剂PAA-AMPS/HA/MMT (PAAHM)以及PAA-AMPS/MMT (PAAM)，分别对其应用性能进行测试评价，并对高吸水树脂吸水溶胀动力学进行模拟，结果表明：PAAHM、PAAM以及市售沃特保水剂具有较好的短时吸水速率，在5 min时的吸水倍率达到80 g/g以上，并且PAAHM、PAAM、沃特保水剂在吸水30~40 min时，均达到慢速吸水阶段。通过准一阶动力学模型拟合能够PAAHM、PAAM以及沃特吸水树脂的吸水溶胀行为进行拟合，可以发现3种吸水树脂的吸水溶胀行为均为非Fick扩散，其吸水溶胀受到水分子渗透扩散行为、聚合凝胶网络弹性张弛以及亲水基团与水分子之间相互影响等因素。相比于准一阶动力学，准二阶动力学更加适合对PAAHM以及沃特吸水树脂的吸水溶胀行为进行描述，并且准二阶动力学模型对于这两种复合吸水树脂的溶胀平衡倍率与实验测得的饱和吸水倍率非常接近。

Abstract: A composite water retention composite was synthesized by using inverse suspension polymeri-zation with acrylic acid (AA), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), humic acid (HA-K), and bentonite (MMT) as main raw materials. The agents PAA-AMPS/HA/MMT (PAAHM) and PAA-AMPS/MMT (PAAM) were tested and evaluated for their application performance, and the water-swelling kinetics of the superabsorbent resin was simulated. The results show that: PAAHM, PAAM and the market the Water-retaining agent sold has a good short-term water ab-sorption rate, and the water absorption rate at 5 minutes reaches more than 80 g/g, and the PAAHM, PAAM, and water-retaining agent all reach the slow water absorption stage when they absorb water for 30~40 minutes. By quasi-first-order kinetic model fitting, the water-swelling behavior of PAAHM, PAAM, and Water absorbent resins can be fitted. It can be found that the water-swelling behavior of the three water-absorbing resins is non-Fick diffusion, and the wa-ter-absorbing swelling is affected by the penetration and diffusion of water molecules Behavior, elastic relaxation of the polymer gel network, and interactions between hydrophilic groups and water molecules. Compared with quasi-first-order kinetics, quasi-second-order kinetics is more suitable for describing the water-swelling behavior of PAAHM and water-absorbing resins, and the quasi-second-order kinetics model for the swelling equilibrium ratio and experiments of these two types of composite water-absorbing resins. The measured saturated water absorption ratios are very close.