PETG blow molding film and preparation method thereof
A blown film and molding technology, applied in the field of blown film and preparation, can solve the problems of difficulty in continuous and stable blown film production, huge differences in melt properties, and inability to form normally, and achieves flexible and convenient product replacement and processing temperature. The effect of a wider range and lower production costs
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Embodiment 1
[0036] Embodiment 1: see figure 1 , One-time inflation molding (one-bubble method) to prepare non-shrinkable PETG blown film.
[0037] Material composition: PETG (intrinsic viscosity 0.68) 91.545wt%, silicon dioxide 2.5wt%, ricinoleic acid amide 0.7wt%, stearamidopropyl dimethyl-β-hydroxyethylammonium dihydrogen phosphate 0.25 wt%, bisoxazoline 0.005wt%, modified ethylene propylene rubber 5wt%.
[0038] Blown film preparation: fully mix the materials in a low-speed mixer → send them to a vacuum dryer 1 for drying → transport them to a single-screw extruder 2 for plasticizing and extruding → blow the film once through a film blowing head 3 → curl → divide Cut → finished product.
[0039] Process parameters: Mixing: heating temperature is less than 40°C, speed 650 rpm, mixing for 8-15 minutes; vacuum drying: 65±5°C for 8h, vacuum degree 0.01-0.02Mpa, stop drying when the moisture content is ≤0.008wt%; single The temperature of each section of the screw plasticizing extruder f...
Embodiment 2
[0040] Example 2: see figure 1 , One-time inflation molding to prepare non-shrinkable PETG blown film.
[0041] Material composition: PETG (intrinsic viscosity 0.70) 87.292wt%, artificial talc 3.0wt%, oleic acid amide 1.0wt%, alkyl phosphate diethanolamine salt 0.7wt%, homopolytetracarboxylic dianhydride 0.008wt%, styrene - Ethylene-butadiene-styrene copolymer 8 wt%.
[0042] The extrusion process is as in Example 1. Process parameters before extrusion are as in Example 1. Temperature of each section of plasticizing single-screw extruder: 160±5°C, 180±5°C, 190±5°C, 200±5°C, 215±5°C; connector temperature: 210±5°C; film blowing head temperature : 218±3℃; inflation ratio: 3.2.
Embodiment 3
[0043] Embodiment 3: see figure 2 or image 3 , Two-way heat-shrinkable PETG blown film prepared by secondary inflation molding (two-bubble method).
[0044] Material composition: PETG (intrinsic viscosity number 0.72) 90.85wt%, hydrated magnesium silicate 2.9wt%, erucamide 0.8wt%, stearamidopropyl dimethyl-β-hydroxyethyl ammonium nitrate 0.314wt%, Epoxy styrene-acrylic acid random copolymer 0.006wt%, ethylene-vinyl acetate copolymer 5.13wt%.
[0045] Blown film preparation: one-time blown film is the same as Example 1, wherein the temperature of each section of the single-screw extruder: 170±5°C, 185±5°C, 195±5°C, 208±5°C, 217±5°C; connector temperature : 210±5℃; Film blowing head temperature: 212±3℃; Inflation ratio: 1.7. After the primary blown film, the primary blown film is heated by far infrared for 11 (oven temperature: 100±5°C) ( figure 2 ), or water bath heating 17 (water tank temperature: 95 ± 5 ℃ image 3 ) image 3 , for the second cooking film, the second ...
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