CMC-g-PAA/APT/HA复合高吸水性树脂的制备与溶胀性能

Preparation and Swelling Behaviors of CMC-g-PAA/APT/HA Superabsorbent Composites

以羧甲基纤维素(CMC)为基质,丙烯酸(AA)为单体,凹凸棒黏土(APT)和腐植酸(HA)为复合组分,采用水溶液聚合法制备了羧甲基纤维素接枝聚丙烯酸/凹凸棒黏土/腐植酸(CMC-g-PAA/APT/HA)环境友好复合高吸水性树脂,用红外光谱(FTIR)进行了结构表征。考查了APT和HA含量对树脂吸水倍率和吸水速率的影响,研究了树脂在不同pH溶液中的溶胀行为以及反复吸水性能。试验结果表明,APT和HA通过其表面的活性基团参与了接枝共聚反应,在体系中引入HA和APT能够显著提高复合高吸水性树脂的吸水能力。在HA含量为5%(质量分数),APT含量为30%(质量分数)时,树脂可达到最优吸蒸馏水倍率为582g/g。该复合高吸水性树脂在pH值在4～11范围内时具有较高的吸水性能,表现出优异的pH稳定性。经过5次反复溶胀后,该复合吸水树脂仍能达到424g/g的吸水倍率,较不含APT和HA样品提高了近44%。

Using carboxymethyl cellulose(CMC) as polymer matrix,acrylic acid(AA) as monomer,attapulgite(APT) and humic acid(HA) as composite components,novel eco-friendly carboxymethyl cellulose-g-poly(acrylic acid)/attapulgite/humic acid(CMC-g-PAA/APT/HA) superabsorbent composites were prepared by the method of aqueous solution polymerization. The structure of the developed composite was characterized by infrared spectra(FTIR). The effects of APT and HA contents on water absorption capability and rate were measured,a...