Electroplated grade PVC
DATE：2023/1/29 10:05:46 / READ： / SOURCE：This station
2.3.23 Electroplated grade PVC
(1) Formula
① The material formula (mass fraction) for injection molding products is PVC (SG5 type) 100, plasticizer 5.5, stabilizer 7.5, lubricant 1, toughener 15, inorganic filler 12, and processing aid (ACR-201) 6.5.
② Extrusion product material formula (mass fraction) PVC (SG5 type) 100, stabilizer 6.5, lubricant 1, toughener 15, inorganic filler 17, polyacrylate processing aid (ACR-201) 6.5.
(2) Operation methods for blending of various raw materials
① Add the filler into the high-speed hot mixer and mix for 5min at 90 ℃.
② Add PVC, stabilizer and lubricant into the high-speed hot mixer in sequence, and mix at 100 ℃ for about 6 minutes.
③ Add the processing aid polyacrylate (ACR-201) into the high-speed hot mixer and mix at 100 ℃ for 5min.
④ Add the plasticizer into the high-speed hot mixer and mix for 5min at 100 ℃.
⑤ Add the toughener into the mixer and mix for 10 min at 115 ℃.
⑥ Add the mixed raw materials into the cold mixer to cool down to below 45 ℃.
⑦ Add cooling materials into the extruder for mixing and plasticizing, and extrude and granulate.
⑧ Dry the granules in an 80 ℃ oven for 1~1.5h.
(1) The process conditions of injection molding products adopt the universal reciprocating screw injection molding machine. The temperature of the raw material plasticizing barrel is 125~135 ℃ in the feed section, 140~150 ℃ in the middle section, 170~180 ℃ in the nozzle, and 200 ℃ in the injection molten material
210 ℃, injection pressure is about 6.5MPa.
(2) The process conditions of the extruded products adopt the universal single-screw extruder, with the screw structure of equal distance and unequal depth, the compression ratio of 2.5 ∶ 1, and the length-diameter ratio of L/D20:1.
Process temperature of each section of the barrel: 120~130 ℃ in the feeding section, 170~180 ℃ in the plasticizing section 160~170 in the homogenizing section.
(2) Precautions for electroplating production
① The proportion of roughening solution used for roughening treatment of parts is: CrzO; 20%~35%, 35% for HzSO4, and 30%~50% for H2O.
② When the injection molding parts are roughened, the roughening solution temperature is 60~65 ℃, and the treatment time is about 35 minutes; The roughening solution used for roughening treatment of extruded parts is 70~75 ℃.
③ The alkaline washing solution for alkaline washing should be of medium concentration, and at the same time, an organic solvent that enhances the surface lubrication and interface extraction of the product should be added for cleaning. The more suitable alkaline washing solution temperature is 40~45 ℃, and the alkaline washing time is about 35 minutes.
Electroplating grade PVC refers to the formed PVC plastic products whose surface can be coated with a metal layer of PVC resin. The products formed by electroplating grade PVC have good toughness and comprehensive properties; The peeling strength of the metal layer on the surface can reach 20~30N/25mm.
2.3.23.1 Electroplating grade PVC preparation method(1) Formula
① The material formula (mass fraction) for injection molding products is PVC (SG5 type) 100, plasticizer 5.5, stabilizer 7.5, lubricant 1, toughener 15, inorganic filler 12, and processing aid (ACR-201) 6.5.
② Extrusion product material formula (mass fraction) PVC (SG5 type) 100, stabilizer 6.5, lubricant 1, toughener 15, inorganic filler 17, polyacrylate processing aid (ACR-201) 6.5.
(2) Operation methods for blending of various raw materials
① Add the filler into the high-speed hot mixer and mix for 5min at 90 ℃.
② Add PVC, stabilizer and lubricant into the high-speed hot mixer in sequence, and mix at 100 ℃ for about 6 minutes.
③ Add the processing aid polyacrylate (ACR-201) into the high-speed hot mixer and mix at 100 ℃ for 5min.
④ Add the plasticizer into the high-speed hot mixer and mix for 5min at 100 ℃.
⑤ Add the toughener into the mixer and mix for 10 min at 115 ℃.
⑥ Add the mixed raw materials into the cold mixer to cool down to below 45 ℃.
⑦ Add cooling materials into the extruder for mixing and plasticizing, and extrude and granulate.
⑧ Dry the granules in an 80 ℃ oven for 1~1.5h.
⑨ Finished product weighing and packaging.
(1) The process conditions of injection molding products adopt the universal reciprocating screw injection molding machine. The temperature of the raw material plasticizing barrel is 125~135 ℃ in the feed section, 140~150 ℃ in the middle section, 170~180 ℃ in the nozzle, and 200 ℃ in the injection molten material
210 ℃, injection pressure is about 6.5MPa.
(2) The process conditions of the extruded products adopt the universal single-screw extruder, with the screw structure of equal distance and unequal depth, the compression ratio of 2.5 ∶ 1, and the length-diameter ratio of L/D20:1.
Process temperature of each section of the barrel: 120~130 ℃ in the feeding section, 170~180 ℃ in the plasticizing section 160~170 in the homogenizing section.
2.3.23.3 Electroplating process of electroplating grade PVC products
(1) The production process sequence of electroplating on the surface of plastic products is to remove seven edges and burrs on the surface of the parts → remove oil stains → roughening treatment → alkali washing → sensitization → activation → chemical copper deposition → bright copper plating → bright nickel plating → chromium plating.(2) Precautions for electroplating production
① The proportion of roughening solution used for roughening treatment of parts is: CrzO; 20%~35%, 35% for HzSO4, and 30%~50% for H2O.
② When the injection molding parts are roughened, the roughening solution temperature is 60~65 ℃, and the treatment time is about 35 minutes; The roughening solution used for roughening treatment of extruded parts is 70~75 ℃.
③ The alkaline washing solution for alkaline washing should be of medium concentration, and at the same time, an organic solvent that enhances the surface lubrication and interface extraction of the product should be added for cleaning. The more suitable alkaline washing solution temperature is 40~45 ℃, and the alkaline washing time is about 35 minutes.
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