Method for preparing polyacrylic acid composite macromolecular hydrogel by macromolecular chain template method

The invention discloses a method for preparing polyacrylic acid composite macromolecular hydrogel by a macromolecular chain template method. The macromolecular hydrogel with high mechanical strength and self-repairing property is prepared by taking a macromolecular chain with a coordination function as a template and by guiding an acrylic acid monomer to coordinate and polymerize under the coordination action of metal ions. The self-repairing hydrogel comprises the following raw material components in part by mass: 2.5 to 10 parts of a macromolecular template, 5 to 25 parts of monomers, 30 to 60 parts of water, 0.1 to 2.5 parts of metal ions and 0.1 to 2.5 parts of an initiator. The method is characterized in that preparation of a regular polymer is effectively guided under the existence of the macromolecular template; and the mechanical strength and the self-repairing capability of the hydrogel are enhanced. The composite hydrogel prepared by the method has excellent mechanical performance and excellent self-repairing performance at normal temperature.