Complex phase change hydrogel and preparation method thereof

The invention discloses complex phase-change hydrogel and a preparation method thereof, belongs to the technical field of phase-change materials, and overcomes the defect of hydrogel dehydration caused by high addition amount of inorganic hydrated salt in the prior art. The complex phase change hydrogel is prepared from the following raw materials in percentage by mass: 0.5 to 5 percent of inorganic hydrated salt, 85 to 89.5 percent of water, 5 to 6 percent of polyvinyl alcohol-1799, 2.5 to 3 percent of borax and 0.1 to 1 percent of molecular sieve. The molecular sieve is added into the system, and the inorganic hydrated salt is limited in the pore channel of the molecular sieve, so that the inorganic hydrated salt is not in direct contact with the hydrogel, and the hydrogel is prevented from being dehydrated. Meanwhile, more inorganic hydrated salt can be accommodated in a large number of pore channels, so that the addition amount of the inorganic hydrated salt can be increased, and the heat preservation tim