The invention belongs to the technical field of
putty, provides
solvent-free
polyurethane putty and a preparation method thereof, and solves the problem of poor
binding force between
putty and a base material. The putty comprises the following raw materials in parts by
mass: 45-95 parts of a hydroxyl resin composition, 5-15 parts of a
plasticizer, 5-10 parts of a rheological agent, 1-5 parts of a dispersing agent, 4-6 parts of a defoaming agent, 40-60 parts of an
isocyanate curing agent, 1-5 parts of a thixotropic agent, 40-60 parts of filler and 30-50 parts of an auxiliary agent. According to the invention, a hydroxyl resin composition is used as a matrix, an
isocyanate curing agent is used for curing to obtain the
polyurethane putty, a composition of methyl hydroxyl
silicone oil, a
titanate coupling agent and hydroxyl-terminated
polybutadiene is selected as an auxiliary agent, and the
titanate coupling agent can combine a
polyurethane component with a filler, so that the compactness of the putty is improved, and
cracking is prevented; the methyl hydroxyl
silicone oil and the hydroxyl-terminated
polybutadiene can react with the curing agent, so that the
binding force of the putty and the base material is further improved.