Foaming PET (Polyethylene Terephthalate) sheet and preparation method thereof
A sheet material and foaming agent technology, applied in the field of polymer foaming material preparation, can solve the problems of unfavorable bubble nucleation and stability, inability to realize continuous production, high processing temperature, etc., and achieve excellent cell size distribution and mechanical properties , The production process is highly continuous and stable, and the effect of good mechanical properties
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Embodiment 1
[0035] Example 1 Preparation of foamed PET sheet.
[0036] Dry the PET resin and bubble nucleating agent at 100°C for 10 hours.
[0037] Use 100 parts by weight of PET (intrinsic viscosity 0.87), add one part by weight of modified montmorillonite bubble nucleating agent, and inject liquid carbon dioxide at 0.6kg / h. In the second-stage single-screw extruder, the extrusion temperature As follows: extruder conveying section 200, 210, 215°C; compression section 215, 220, 225, 225, 215, 215, 210, 210°C; homogenization section 205, 205, 205, 205°C. The temperature of the machine head is 200℃.
[0038] The properties of the obtained PET foam sheet are shown in Table 1.
[0039] Table 1
[0040] Density (g / cc)0.74 Tensile strength (MPa)13.20 Impact strength (KJ / cm 3 ) 11.36 Foaming ratio 2.14
Embodiment 2
[0041] Example 2 Preparation of foamed PET sheet.
[0042] Dry the PET resin and bubble nucleating agent at 100°C for 10 hours.
[0043] Use 100 parts by weight of PET (intrinsic viscosity of 1.15), add one part by weight of modified montmorillonite bubble nucleating agent, and inject liquid carbon dioxide at 0.6kg / h. In the second-stage single-screw extruder, the extrusion temperature As follows: extruder conveying section 200, 210, 215°C; compression section 215, 220, 225, 225, 215, 215, 210, 210°C; homogenization section 205, 205, 205, 205°C. The temperature of the machine head is 200℃.
[0044] The properties of the obtained PET foam sheet are shown in Table 2.
[0045] Table 2
[0046] Density (g / cc)0.53 Tensile strength (MPa)16.40 Impact strength (KJ / cm 3 ) 14.27 Foaming ratio 3.42
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