The invention relates to a preparation method of a low-deformation antibacterial
polyurethane automobile shock absorption bumper block. The preparation method comprises the steps of preparing low-deformation antibacterial
polyol, preparing a
prepolymer, performing
casting molding, pre-curing and demolding, and performing
post curing to obtain the low-deformation antibacterial
polyurethane automobile shock absorption bumper block. According to the preparation method, as
polyester polyol of which the number-average molecular weight is 2000+ / -200,
castor oil which accounts for 0.5-2% of the
mass of the
polyester polyol and an
antibacterial agent which accounts for 0.5-2% of the
mass of the
polyester polyol are adopted, and a
tertiary amine catalyst, water and organo-
siloxane which account for 3+ / -0.5% of the total
mass are added as raw materials, on the premise that other performances of the
polyurethane automobile shock absorption bumper block are not influenced, the after-fatigue deformation of the bumper block is reduced, the
antibacterial property of the bumper block is improved, the phenomena of
fungus catalytic hydrolysis aging, color deterioration, material fracture, light-
colored product yellowing and the like are avoided, and meanwhile, the problem that part of the antibacterial gent is unstable and easy to hydrolyze is solved, thereby meeting requirements on the
antibacterial property of the automobile bumper block by middle and high automobile markets.