Preparation method of antibacterial type degradable disposable tableware

Abstract

The invention provides a preparation method of antibacterial type degradable nontoxic disposable tableware. The disposable tableware is mainly prepared through the following steps: uniformly mixing starch, urea-formaldehyde resin, glycerol and edible type sodium carboxymethylcellulose in a certain proportion at a high speed, and then carrying out compression moulding forming to prepare a tableware shell; then spraying a layer of film-coated agent which is prepared from chitosan/polyvinyl alcohol on the surface of the prepared tableware shell, and drying. The preparation method provided by the invention has the advantages of simple process, low cost and high efficiency. According to the invention, most of the disposable tableware can be decomposed by microbes; the chitosan is uniformly dispersed in the polyvinyl alcohol in a particle form; the prepared disposable tableware shows excellent antibacterial property on staphylococcus aureus and escherichia coli, so that the safety of outdoor usage is enhanced.

Description

technical field [0001] The invention belongs to the field of antibacterial degradable outdoor disposable tableware, in particular to a preparation method of degradable amino resin tableware. Background technique [0002] Polyvinyl alcohol (PVA) has good film-forming properties, water-soluble properties, gas barrier properties, antistatic properties and dust-proof properties, excellent biodegradability, non-toxicity, and fast degradation speed. Chitosan (CS) is a partially deacetylated derivative of chitin, the only alkaline polysaccharide that exists in nature. The chitosan macromolecular chain contains amino groups and hydroxyl groups, which can be well compounded with polyvinyl alcohol without affecting the performance of the film. Due to the presence of a large number of amino groups on the molecular chain of chitosan, it is easy to form NH under acidic conditions. 2 + , NH 2 + Attract each other with the negatively charged outer surface of the bacterial cell membran...

AI Technical Summary

Problems solved by technology

[0003] Disposable foam tableware commonly used in the market now cannot be degraded after use, causing white pollution, thus limiting its scope of use

Recently, people have tried a variety of degradable tableware, but these degradable tableware have certain defects, including high cost, low degradation rate, and toxicity. For example, Chinese patent CN00122914.1 introduces a preparation of degradable tableware method, but the tableware prepared by it can not completely solve the problem of formaldehyde release in urea-formaldehyde resin, and also limits its wide-scale use