▎ 摘　　要

NOVELTY - Nylon refrigerant pipeline comprises 60-80 wt.% polyamide resin, and plasticizer (remaining amount). The plasticizer comprises 30-40 wt.% glass fiber, 20-30 wt.% sisal fiber, 10-20 wt.% flame retardant, 1-2 wt.% nano-kaolin , 1-2 wt.% nano calcium carbonate, 1-2 wt.% graphene, and black masterbatch (remaining amount). USE - The nylon refrigerant pipeline is useful for cars. ADVANTAGE - The nylon refrigerant pipeline has high-strength, high- and low-temperature resistant polyamide complex material for pipelines, has excellent tensile strength, elongation at break, pull-out force, pressure resistance, vacuum resistance and impact resistance, and the weight is reduced by more than 50%. The pipeline steam molding process is designed to replace the vulcanization molding of traditional rubber pipelines and the baking molding of nylon pipelines; improves efficiency; greatly reduces energy consumption, reduces energy consumption by more than 20%, increasing production efficiency by 34 times, and yielding 99.9%; is economical. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the nylon refrigerant pipeline comprising (i) taking the glass fiber, sisal fiber, flame retardant, nano kaolin, nano calcium carbonate, graphene and black masterbatch in the polyamide resin and plasticizer, (ii) uniformly mixing the nano-kaolin, nano-calcium carbonate, and graphene, and dividing them into 3 equal parts, mixture A, mixture B, and mixture C, (iii) adding the polyamide resin in the step (i) and the mixture A in the step (ii) into an internal mixer for banburying, and stirring uniformly at 40-60 degrees C for 20= 30 minutes under 40-70 revolutions/minute (rpm), simultaneous ultrasonic vibration and irradiation treatment to obtain mixture D, (iv) adding the glass fiber, sisal fiber, flame retardant and black master batch from step (i) and the mixture B from step (ii) into the internal mixer for banburying at a speed of 40-70 rpm, stirring uniformly for 20-30 minutes at 40-60 degrees C, and performing ultrasonic oscillation and irradiation treatment at the same time to obtain a mixture E, (v) adding the mixture C in the step (ii) and the mixture D prepared in the step (iii) to the mixture E, and performing banburying at a speed of 120-150 rpm, stirring uniformly for 50-60 minutes at a temperature of 60-80 degrees C, and performing ultrasonic oscillation and irradiation treatment at the same time to obtain a mixture F, (vi) drying the mixture F prepared in the step (v) in a vacuum environment of 95-105 degrees C to make the humidity less than 0.03%, (vii) preheating the injection molding machine mold before closing at 80-90 degrees C for 10 minutes, closing the mold, the temperature is 180-190 degrees C, the pressure is 0.2-0.3 MPa, high-temperature steam of passes through the irregular water channel to instantly heat the mold to 125-135 degrees C, and the mold clamping is completed, (viii) using the injection molding machine to inject the mixture F into the mold completed in the step (vii) and maintain the mold temperature at 125-150 degrees C during the injection process, after the injection molding process is completed, holding the mold pressure and holding the pressure, pressure is 50-60% of the highest pressure when the plastic is filled in the cavity, and the heat preservation is 10-20 minutes, and (ix) using a high-pressure water pump to inject cooling water into the mold channel at a high speed, cooling, blowing air at a temperature of 25-30 degrees C into the mold channel, blowing the cold water in the mold channel out of the mold, and then open the mold.