The invention discloses an HDPE (high-density
polyethylene) pipeline modification process, and belongs to the technical field of HDPE pipelines, the HDPE pipeline modification process comprises the following steps: S1, cleaning: putting an HDPE
raw material and a
cleaning agent into a cleaning
pool together for cleaning; s2,
drying: taking out the HDPE
raw material cleaned in the step S1, and
drying the HDPE
raw material in a
drying machine for 30-40 minutes; s3, mixing: putting the HDPE raw material dried in the step S2, a
toughening agent, an
antioxidant and a defoaming agent into a mixer for mixing, setting the temperature to be 105-110 DEG C, and mixing for 60-80 minutes; s4, extruding: when the temperature in the mixer is reduced to 40 DEG C, taking out the mixed material, drying at 70-80 DEG C for 2 hours, feeding into an extruder by using a vacuum feeding
machine, and extruding and forming the HDPE pipeline by using the extruder; s5, cooling is conducted, specifically, the formed HDPE pipeline is cooled, and fixed-length
cutting is conducted; and S6, warehousing is conducted, specifically, the HDPE pipelines subjected to fixed-length
cutting are sequentially inspected, printed with marks and warehoused as finished products. According to the invention, the problems of high
brittleness and low ring stiffness of the cooled HDPE pipeline are effectively improved, the product performance is improved, and the service life of the HDPE pipeline is prolonged.