The application discloses a plastic
embedding agent Big
Cut resin, which is composed of a crosslinking agent and a non-reactive liquid auxiliary agent in a
mass ratio of 3:7 to 7:3. The application further discloses a preparation method of the plastic
embedding agent, which comprises the steps of mixing the crosslinking agent and the non-reactive liquid auxiliary agent in the
mass percentage to obtain a mixture, and adding an initiator into the mixture to obtain the Big
Cut resin. The application further discloses a plastic embedding method suitable for thick
cutting of a large-volume sample, which embeds a
biological tissue sample by using the Big
Cut resin. The embedding method can realize uniform and stable
polymerization of the large-volume resin, improve the
cutting performance of the sample after embedding, meet the thick
cutting requirement of an fMOST
system, has the advantages of transparent
depth imaging and adjustable
refractive index, and realizes high-
throughput imaging.