High oil absorption resin with semi-interpenetrating polymer network structure and its preparation method

The invention discloses high oil absorption resin with a semi-interpenetrating polymer network structure and its preparation method. The high oil absorption resin comprises the following ingredients: 100 parts of oil absorption monomer, 2-20 parts of styrene, 0.1-1 part of cross-linking agent, 0.3-3 parts of dispersant, 0.1-1 part of initiator, 5-30 parts of pore forming agent and 2-20 parts of semi-interpenetrating polymer network structure agent. The preparation method comprises the following steps: a, dissolving the dispersant in deionized water; b, dissolving the semi-interpenetrating polymer network structure agent in the short chain acrylic acid ester monomer, mixing with long chain alkyl ester monomer, the initiator, the cross-linking agent, styrene and the pore forming agent in the dispersant of the step a; c, heating the mixture, stirring , reacting, slaking to stop the reaction; d, washing, pump filtering, drying to obtain the product. The high oil absorption resin has the advantages of high oil absorption multiplying power, fast oil absorption rate and good oil absorption reversibility.