Patent ID: 9457388
Filing Date: 2016-10-04
CPC Classification: B09C,B28B,C02F

Claim Text:
1. A preparation method for a double-layer persulfate sustained-release, comprising: (1) preparing an inner-layer material including mixing persulfate, cement, sand and water uniformly in a mass ratio of 1:(0.6-1):(1.5-2.5):(0.5-1); (2) filling the inner-layer material prepared in step (1) into an inner-layer mould and removing the inner-layer mould after the inner-layer material was fixed into an inner-layer structure, wherein the inner-layer structure has a cubic structure with a side length of 1-8 cm; (3) preparing an outer-layer material including mixing persulfate, cement, sand and water uniformly in a mass ratio of 1:(2-3):(1.2-1.5):(0.8-1.2); and (4) embedding the inner-layer structure into the centre of an outer-layer mould and filling in the outer-layer mould with the outer-layer material prepared in step (3) to obtain a structure, wherein the structure obtained is a cube with a side length of 2-10 cm, and the structure obtained is further solidified for 1-2 days.