Packing materials of starch-polypropylene foam, an preparation method
A polypropylene foam and packaging material technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problem of insufficient degradation speed, and achieve the effect of accelerating the degradation speed.
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Embodiment 1
[0020] 1. Formula (by weight):
[0021] Starch 42 parts
[0022] Polypropylene 100 parts
[0023] 4 parts p-toluenesulfonyl semicarbazide
[0024] Sodium benzoate 0.8 parts
[0025] 2. 1.6 parts of 5-dimethyl-2,5-di-tert-butylperoxyhexane
[0026] Fatty acid glycerides 18 parts
[0027] 16 parts isopentane
[0028] 2. Preparation process:
[0029] a. According to the above formula, add all components except the physical blowing agent "isopentane" into the high-speed mixer according to the ratio, and stir evenly at room temperature;
[0030] b. Add the mixture obtained in step a into a twin-screw extruder with a T-shaped head and a preparation injection port on the barrel for segmental heating and extrusion of the barrel. The temperatures of each section of the barrel are: 110°C, 135°C ℃, 155°C, 165°C, 170°C, 165°C; while the barrel is heated and extruded in sections, inject the physical foaming agent "isopentane" into the formulation injection port of the twin-screw ext...
Embodiment 2
[0034] 1. Formula (by weight):
[0035] Starch 38 parts
[0036] Polypropylene 80 parts
[0037] 4 parts p-toluenesulfonyl semicarbazide
[0038] Sodium benzoate 0.6 parts
[0039] Dicumyl peroxide 1.6 parts
[0040] Fatty acid glycerides 16 parts
[0041] carbon dioxide 4 parts
[0042] 2. Preparation process:
[0043] a, b, c steps are identical with embodiment 1.
[0044] d. Laminating and bonding the finished sheet-shaped foam packaging material obtained in step c to reach the required thickness of the industrial product packaging material, and then cutting and rotary cutting according to the required packaging shape of the industrial product to make the industrial product packaging material.
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