γ-聚谷氨酸/凹凸棒石复合高吸水树脂的制备及性能

Preparation and performance ofγ-polyglutamic acid/attapulgite Superabsorbent Composite

摘要:

以γ-聚谷氨酸和凹凸棒石为原料，以聚乙二醇二缩水甘油醚为交联剂，制备了γ-聚谷氨酸/凹凸棒石复合高吸水树脂，采用FTIR和SEM对其形貌和结构进行了表征。考察了γ-聚谷氨酸质量分数和凹凸棒石用量对复合高吸水树脂溶胀度的影响，发现适宜的γ-聚谷氨酸和凹凸棒石质量分数分别为14%和6%，样品在蒸馏水中的溶胀度较高，为820 g/g。同时，考察了溶液pH、NaCl质量分数、ZnCl2质量分数、和Na2SO3质量分数对复合树脂溶胀行为的影响，结果表明：适宜的pH为5～9；溶液中离子的质量分数越低，复合高吸水树脂的溶胀度越大；ZnCl2溶液对树脂溶胀行为影响较大。此外，复合高吸水树脂具有较好的保水性能。

Abstract:

A γ-polyglutamic acid/attapulgite superabsorbent composite was prepared using γ-polyglutamic acid and attapulgite as materials, and polyethylene glycol glycidyl ether as crosslinking agent. The structure and surface morphology of the superabsorbent composite were characterized by Fourier transformation infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The effects of the mass fraction of γ-polyglutamic acid and attapulgite, pH value of solution, the mass fractions of NaCl, ZnCl2 and Na2SO3 on the swelling ratio were investigated in distilled water. The results showed that the suitable mass fraction of γ-polyglutamic acid and attapulgite were 14% and 6%, and the suitable pH value was 5~9. The lower the mass fraction of the ions in the solution, the greater the swelling degree of the superabsorbent composite. ZnCl2 aqueous solution had a great influence on the swelling behavior of γ-polyglutamic acid/attapulgite superabsorbent composite. In addition, the superabsorbent composite had good water retention.