Patent ID: 8257632

Claim:
A process for producing heat-insulating transparent PVC sheet having inorganic heat-insulating particles uniformly dispersed inside, comprising the following steps: (1) introducing raw materials including coupling agent of 0.01-15.0 PHR, ultraviolet absorber of 0.01-5.0 PHR, dispersant of 0.01-10.0 PHR, inorganic heat-insulating particles of 0.01-15.0 PHR and plasticizers of 1-45 PHR in a dispersing device and finally formed as a paste through high-speed shear force exerted from the dispersing device under temperature of 25-70° C.; (2) sequentially introducing the paste made of step (1), PVC resin of 100 PHR, plasticizer of 1-85 PHR, stabilizer of 0.1-15.0 PHR, lubricant of 0.1-15.0 PHR and colorant of 0-12.0 PHR into a mixer device for uniform mixing as a PVC mixture; and further drawing the PVC mixture into a Banbury mixer for refinement; (3) controlling the PVC mixture at temperature of 150-190° C., heating and shearing the PVC mixture in a roller machine for well-gelation, and proceeding one of the following processes: (i) calendering the PVC mixture by a Calender to form a heat-melting sheet of thickness of 0.05-1.0 mm, and then entering step (4) after forming; (ii) processing the PVC mixture by a T-Die machine to form a heat-melting sheet of thickness of 0.05-1.0 mm, and then entering step (4) after forming; or (iii) processing the PVC mixture by a blow-molding machine to form a heat-melting sheet of thickness of 0.02-0.08 mm, and then entering step (4) after forming; (4) drawing the formed heat-melting sheet into water at temperature of 10-50° C. for cooling, and then entering step (5) after dehydration; and (5) drawing the sheet into a cooling wheel for cooling and shaping, and then rolling up to obtain the heat-insulating transparent PVC sheet.