| abstract |
The invention relates to a continuous extrusion preparation method of a flame-retardant PET foam plate, which comprises the following steps: according to the weight, 100 parts of PET foaming raw material resin, 0.3-1 part of chain extender, 0.1-10 parts of nucleating agent, 0.1-10 parts of heat stabilizer, 5-15 parts of flame retardant and 0.1-5 parts of synergist are added into a high-torque double-screw extruder, completely melted and mixed in a cylinder of the high-torque double-screw extruder to form a melt, and CO is quantitatively and constantly pressurized 2 Or injecting cyclopentane into the machine barrel to be mixed with the melt; extruding the mixed melt by a high-torque double-screw extruder and a single-screw extruder, cooling the melt by a melt cooler, mixing the melt by a static mixer, and forming a stably solidified foam structure by a strip foam die head; and (3) drawing, cooling, shaping, trimming and cutting the solidified cellular structure into a standard plate along with an auxiliary machine. The formula of the invention can be used for preparing the foaming material; the continuous method replaces the intermittent method to improve the production efficiency; and a gas collecting hood is arranged in the extrusion foaming area to collect and treat tail gas, so that the environmental protection requirement is met. |