The invention provides a colorful tire sidewall rubber composition, which is prepared from the following components in parts by weight: 10 to 30 parts of
natural rubber, 30 to 60 parts of chlorinated
isobutylene-
isoprene copolymer, 10 to 18 parts of
ethylene propylene
diene monomer or 35 to 45 parts of butadiene rubber and 1 to 2 parts of
stearic acid, 0 to 20 parts of a layered
aluminosilicate mineral; 10 to 30 parts of
titanium dioxide; 5 to 25 parts of white
carbon black; 0.4 to 3 parts of a
silane coupling agent; 5-20 parts of an azo dye or a
phthalocyanine dye; 4-8 parts of a vulcanizing agent; 1-8 parts of an anti-aging agent; the invention also discloses a preparation method of the sidewall rubber composition. Layered
aluminosilicate mineral and azo dye or
phthalocyanine dye
organic dye are added, hydroxyl on the surface of the layered
aluminosilicate mineral adsorbs rubber molecular chains through
Van der Waals force, filler agglomeration is reduced, dispersion uniformity is improved, local
stress concentration is reduced, and mechanical performance is improved; meanwhile, the
color saturation of the colorful tire sidewall composition can be high due to the
organic dye, and the colorful tire sidewall composition can be widely applied to preparation of personalized customized colorful tires.