Preparation method of blown film
A blown film and plasticizer technology, applied in the field of blown film preparation, can solve problems such as poor processing performance, mechanical properties and thermoplasticity, and achieve the effects of improving agglomeration, promoting uniform dispersion and improving mechanical properties
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[0025] The preparation method of blown film, comprises the steps:
[0026] The first step, weigh each raw material according to the following parts by weight: 60-70 parts of polyvinyl alcohol, 3-4 parts of modified chitosan, 2-3 parts of modified starch nanocrystals, 0.8-1 part of fumaric acid , 0.2-0.3 parts of plasticizer, 0.5-0.7 parts of lubricant, 0.2-0.3 parts of antioxidant;
[0027] The second step is to mix the above raw materials uniformly after vacuum drying, put them in a twin-screw extruder to melt and extrude them, and then use a blow molding machine to perform blow molding, water cooling, traction and winding to obtain a blown film;
[0028]The vacuum drying condition is 80°C, drying for 10-12h; the temperature during melt extrusion is 150-160°C; the inflation ratio is controlled at 2.2-2.6 during the blow molding process;
[0029] The plasticizer is a compound of N,N-dimethylformamide and urea, the mass ratio of N,N-dimethylformamide and urea is 1:2-3; the com...
Embodiment 1
[0046] The preparation method of blown film, comprises the steps:
[0047] The first step, weigh each raw material according to the following parts by weight: 60 parts of polyvinyl alcohol, 3 parts of modified chitosan, 2 parts of modified starch nanocrystals, 0.8 part of fumaric acid, 0.2 part of plasticizer, lubricating 0.5 parts of antioxidant, 0.2 parts of antioxidant;
[0048] The second step is to mix the above raw materials uniformly after vacuum drying, put them in a twin-screw extruder to melt and extrude them, and then use a blow molding machine to perform blow molding, water cooling, traction and winding to obtain a blown film;
[0049] The vacuum drying condition is 80°C, and the drying time is 10 hours; the temperature during melt extrusion is 150°C; the inflation ratio is controlled at 2.2 during the blow molding process.
Embodiment 2
[0051] The preparation method of blown film, comprises the steps:
[0052] The first step, weigh each raw material according to the following parts by weight: 65 parts of polyvinyl alcohol, 3.5 parts of modified chitosan, 2.5 parts of modified starch nanocrystals, 0.9 part of fumaric acid, 0.25 parts of plasticizer, lubricating 0.6 part of anti-oxidant, 0.25 part of antioxidant;
[0053] The second step is to mix the above raw materials uniformly after vacuum drying, put them in a twin-screw extruder to melt and extrude them, and then use a blow molding machine to perform blow molding, water cooling, traction and winding to obtain a blown film;
[0054] The vacuum drying condition is 80°C, and the drying time is 11 hours; the temperature during melt extrusion is 155°C; the inflation ratio is controlled at 2.4 during the blow molding process;
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