The invention relates to the technical field of building waterproof materials, in particular to a rubber
waterstop for a deformation joint of a combined concrete floor. The rubber
waterstop sequentially comprises a composite rubber plate, a self-
adhesive rubber sheet and an elastic supporting strip from top to bottom. The composite rubber plate is composed of a modified rubber plate and a
glass fabric reinforcing layer arranged on the top of the modified rubber plate. The modified rubber plate is prepared by the following method: putting 90-110 parts by weight of a rubber base material, 4-6 parts by weight of
nano zinc oxide, 1-1.5 parts by weight of
stearic acid, 2-3 parts by weight of an anti-aging agent, 8-12 parts by weight of a functional aid, 20-30 parts by weight of dioctyl
phthalate, 15-30 parts by weight of
carbon black, 20-40 parts by weight of kaolin and 1-2 parts by weight of an
accelerant into an internal mixer for mixing; performing
extrusion molding on the rubber compound by adopting an extruder or a calender, and then performing
cutting treatment, thereby obtaining the product. The rubber
waterstop provided by the invention not only has excellent waterproof and dynamic sealing effects, but also has excellent mechanical properties and
aging resistance; meanwhile, installation is flexible and efficient, and construction and later maintenance cost is reduced.