Novel PVA-based preserving and packaging coating material and preparation process thereof

Abstract

The invention relates to a process for preparing a novel PVA-based preserving and packaging coating material, and belongs to the field of food packaging materials. The process comprises the following steps: mixing the new materials according to the following concentration: 3 to 8 percent of PVA and water, 1 to 3 percent of stearic acid and water, and 0.35 to 0.45 percent of glutaric dialdehyde and water; soaking the PVA for 2 hours at a normal temperature, heating and dissolving the PVC; dissolving the stearic acid in 95 percent ethanol, heating and dissolving the stearic acid; when the temperature of the PVA and the stearic acid reaches over 85 DEG C, mixing and reacting the PVA and the stearic acid for 3 to 10 minutes; adding the glutaric dialdehyde into the mixture, and reacting the mixture and the glutaric dialdehyde for 30 to 50 minutes at the temperature of 85 DEG C; and adjusting the pH value of the obtained product to between 4 and 6.5, and preparing the PVA-based preserving composite coating material. The process adopts the glutaric dialdehyde as a crosslinking agent of the stearic acid and a PVA diatomic substrate, and the novel PVA-based preserving and packaging coating material obtained by crosslinking reaction can obviously reduce the water permeability of the PVA substrate after film-forming, improve the water resistance, and generate strong antibacterial property.

Description

1. Technical field: [0001] The invention relates to a new film-coated fresh-keeping packaging material for food packaging and its preparation process, which belongs to the technical field of composite packaging materials, in particular to a kind of polyvinyl alcohol and stearic acid as basic materials, glutaraldehyde as crosslinking A polyvinyl alcohol-based coating film fresh-keeping packaging material and its preparation process. 2. Background technology: [0002] The fresh-keeping method of film-coated packaging is a new hotspot in the research and development of food packaging storage and preservation in recent years. It is widely used in the packaging and preservation of fresh and processed food because of its simple operation process, good packaging storage and preservation effect, economical and practical. The freshness preservation effect of film-coated packaging mainly depends on the choice of film material and film-forming method. Polyvinyl alcohol (PVA) is easy t...

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Problems solved by technology

[0003] Technical Problems The purpose of the present invention is to provide a solution for the problems of poor water resistance and water resistance of polyvinyl alcohol used as a coating fresh-keeping package; poor compatibility of polyvinyl alcohol and stearic acid blends, and no antibacterial and fresh-keeping functions. New material and preparation process of polyvinyl alcohol-based coating film fresh-keeping packaging for fresh-keeping packaging of food (especially egg products)

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