A kind of degradable food preservation film and preparation method thereof
A food preservation and polymer resin technology, applied in the field of food packaging materials, can solve the problems of contamination of food and the environment, non-degradation, leakage of plasticizers, etc., and achieve the effects of slowing down food deterioration, long preservation period, and inhibiting growth.
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Embodiment 1
[0035] Embodiment 1 and embodiment 2 are preferred technical solutions of the present invention, and comparative examples 1 to 3 are comparative experiments.
[0036] Example 1
[0037] In this example, glyceryl monocaprylate (GMC) was selected as plasticizer, PLA and PHB were used as base film materials, and cinnamaldehyde was added as active bacteriostatic agent. Prepare 1 kg of degradable food preservation film, raw materials and dosage: 708.75g PLA, 236.25g PHB, 5g GMC and 50g cinnamaldehyde. That is, the mass ratio of GMC, polymer resin base film material (PLA and PHB) and active antibacterial agent is 0.5:94.5:5, and the mass ratio of PLA to PHB is 3:1. The cinnamaldehyde added in this embodiment is It exists in the form of plant essential oil, and the content of cinnamaldehyde in the plant essential oil is not less than 95%.
[0038] Preliminarily vacuum-dry PLA and PHB at 0.1MPa and 55°C for 2 hours, then add glyceryl monocaprylate and stir evenly, and then prepare m...
Embodiment 2
[0041]In this embodiment, glyceryl laurate (GML) is selected as plasticizer, PLA and PHB are degradable polymer resin base film materials, and cinnamaldehyde is added as active bacteriostatic agent. The degradable food preservation film of 1 kilogram quality is prepared, and raw material and consumption are: 50g cinnamaldehyde, 5g GML, 708.75g PLA and 236.25g PHB, namely GML, polymer resin base film material (PLA and PHB) and active antibacterial agent The mass ratio of PLA to PHB is 0.5:94.5:5, and the mass ratio of PLA to PHB is 3:1. The cinnamaldehyde added in this embodiment exists in the form of plant essential oil, and the content of cinnamaldehyde in the plant essential oil is not less than 95%.
[0042] Preliminarily vacuum-dry PLA and PHB for 2 hours at a vacuum degree of 0.1Mpa and 55°C; then add GML and stir evenly, and then prepare modified degradable polymer resin particles through a twin-screw extruder. The screw rotation speed of the twin-screw extruder is 30r / ...
Embodiment 3
[0054] The degradable food preservative film A, degradable food preservative film B prepared by Examples 1, 2 and Comparative Examples 1 to 3 and the preservative film C, D and E of the control group are tested for physical and mechanical properties, including: tensile strength , elongation at break, water vapor transmission rate, oxygen transmission rate, haze and light transmittance. The testing method is as follows: GB / T 1040.3-2006 is used for mechanical properties, GB / T 2410-2008 is used for haze and light transmittance, GB / T 26253-2010 is used for water vapor transmission rate, and GB / T 1038 is used for oxygen transmission rate -2000. The experimental results are as follows:
[0055] Table 1. Thin film physical and mechanical properties testing
[0056]
[0057]
[0058] It can be seen from the data that, compared with degradable food preservation film D, the tensile strength of degradable food preservation film A and B has been greatly improved. This is because...
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