Freshness-retaining and heat-proof food packaging or containing material and preparation method thereof
A technology of machine materials and mixtures, which is applied in packaging, household packaging, and packaged food. It can solve the problems of high and low temperature resistance, heat preservation, freshness preservation, and environmental protection at the same time, and achieve excellent microwave resistance.
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[0022] A food lunch box material for fresh-keeping and heat insulation, the proportion of each component is as follows: A-homopolymer polypropylene (homopolymer PP) 5-10 parts; high melt strength polypropylene 80-90 parts ( Sinopec Yanshan Petrochemical Company), C-homopolymer PP or calcium carbonate polypropylene 5-10 parts, D-homopolymer PP 5-10 parts, E-sodium bicarbonate 2-5 parts; A and D were added with 5wt‰- 5 wt% F-color masterbatch. Its preparation method is as follows:
[0023] (1) Add color masterbatch to A and D respectively, mix well, and put them into A extruder and D extruder hopper respectively; add E-sodium bicarbonate to high melt strength polypropylene to foam, then add B to extrude In the hopper of the extruder; C is added into the hopper of the C extruder; the extrusion processing temperature is controlled at 160-280 ° C;
[0024] (2) B high melt strength polypropylene foam is mixed, plasticized and extruded by B extruder, and C material is mixed, plasti...
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