The invention discloses a three-layer
noise reduction drainage
pipe, which comprises a drainage
pipe body, wherein the drainage
pipe body is a three-layer co-
extrusion composite pipe formed by an
impact-resistance outer layer, a
noise reduction middle layer and an
impact-resistance inner layer through co-
extrusion. The
noise reduction middle layer is a sound-absorbing middle layer or a sound insulation middle layer made of expandable
polyvinyl chloride composition materials. The above
layers are prepared with the following materials. The
impact-resistance outer layer is made of
polyvinyl chloride resin,
chlorinated polyethylene, dibasic lead phosphite, tribasic
lead sulfate,
calcium stearate, lead
stearate, paraffin, PVC
processing and modifying agent, active light
calcium carbonate,
titanium dioxide and dioctyl
phthalate. The sound-absorbing middle layer is made of
polyvinyl chloride resin,
chlorinated polyethylene,
lead salt stabilizer,
calcium stearate,
stearic acid, paraffin, dioctyl
phthalate, active light
calcium carbonate and
barium sulfate. The sound insulation middle layer is made of polyvinyl
chloride resin, methacrylic ester
polymer and inorganic
foaming agent. Compared with the outer layer, the impact-resistance inner layer comprises the same components with the outer layer, except that PVC is adopted instead of polyvinyl
chloride resin. The noise of the drainage pipe can be effectively reduced and the intensity of the drainage pipe is enhanced.