One new type of super absorbent composite resin that can be self-degraded was prepared by using a new crosslink reagent.It was prepared by water solution co- polymerization based on acrylamide

acrylic acid

ammonium persulfat

bentonite and pillared bentonite.Ammonium persulfat was the initiator and polyhydroxyl-Al cations which was in bentonite layers was the crosslink reagent. The pillared effect of bentonite was studied by X-ray diffraction analysis; the best dosage of pillared bentonite and initiator was studied by researching the absorption capability of distilled water and 0.9% salt solution

respectively.The self-degradation of composite resin was studied by observing the state of the composite resin gel.The pillared effect was very good.The polyhydroxyl-Al cations was introduced into the layer of bentonite.The best dosage of pillared Bentonite and initiator was 2.4% and 0.34% of total monomer quality

respectively.The self-degradation of this composite resin was better than that of other super absorbent rein

At 65 ℃ it was self-degraded completely in 25 days.