Potato haulm/sodium lignin sulfonate high-absorbent material and preparation thereof

The invention provides a high water-absorbent composite material prepared with the raw materials of potato leaves and lignin sulfonate. The super absorbent composite material is made as follows: the potato leaves and stems are dried and crushed and then processed with graft copolymerization with acrylic acid and acrylamide in the microwave radiation and are interpenetrated with the lignin sulfonate at the same time so as to prepare the degradable semi-interpenetrating network absorbent material. Upon measurement, the water-absorbent material prepared by the invention has the distilled water absorption rate up to 200-700 times of self dry weight, and the saline(0.9%) absorbency up to 20-80 times of self dry weight.