Starch-based biodegradable packaging materials of antimicrobial

摘要

With the gradual increase of the global environmental awareness and environmentally friendly voice rising, the deal with the problem of plastic waste has become the focus of public opinion around the world has also become a hot topic of scientific research. This paper can be made of polystyrene as main raw material, adding starch and antibacterial agents containing silver nano-scale titanium dioxide, and by the synthesis of biodegradable packaging materials performance. The results showed that: 0.25mm sheet of polystyrene made of the thickness of the main raw material by injection molding process, and factors affecting the performance of the sheet, the better the performance of the film material process parameters. According to the definition of the GB/T1040-92 national standards of the People's Republic of China "plastic tensile properties of test methods and GB/T20197-2006 degradable plastics, classification, marking, and degradation of the performance requirements" and GB4789.3-94 "State Microbiological examination of coli form bacteria in the standard of food hygiene as determined by experimental methods for testing. The orthogonal experiment results show that the expandable polystyrene Dosage: 80%; starch dosage: 2%; toluene, acetone and put ratio: 3:2. The mechanics of materials, degradation, and antimicrobial properties. Packaging is to protect the product performance, easy storage and transportation of products, and to facilitate the sale of products, packaging has now become an integral part of the product. Plastic as the last century invention of a new material, since the invention of the beginning, that for its light weight, high strength, corrosion resistance, easy processing, good performance, low price, etc. while very popular, its use has penetrated all sectors of the national economy and all aspects of people's lives, and now has become the most widely used plastic packaging materials. As people's living standards improve, the packaging requirements are also getting higher and higher, not only requires the product packaging beautiful, economical and practical, but also to comply with environmental requirements. Expandable polystyrene is a plastic widely used in recent years, it has brought convenience to people's lives, improve quality of life at the same time, a large number of plastic waste after use to the natural environment for human survival has serious implications especially disposable plastic packaging materials and household goods, easy recycling, is not easily degradable. On the one hand packaging consumes a lot of resources and energy, on the other hand the growing number of packaging waste has become second only to water pollution, marine pollution and air pollution in the lake, the fourth largest pollution. After the use of plastic waste in the environment, about half, it normally takes 200 years to degrade, landfill, incineration is not an ideal solution. Paper products even under the action of microorganisms, but also need 80 years to degrade. In order to improve resource utilization, reduce environmental pollution caused by waste plastic.