Biological-based sheet for food contact and preparation method thereof

Abstract

The invention relates to a biological-based sheet for food contact and a preparation method thereof. Components are proportioned by mass part as following: amylum 40-70%, plasticizing modifier 0.5-2%, coupling agent 0.5-1%, high density polyethylene 15-30%, metallocene polyethylene 5-10%, inorganic filler 5-20% and lubricating agent 0.5-1%. The method comprises the steps of smashing the amylum, the plasticizing modifier is added into the amylum to perform modification, adding the coupling agent, the high density polyethylene, the metallocene polyethylene, the inorganic filler and the lubricating agent into the modified amylum, mixing under the heating condition, cooling the materials, extruding the materials into granules through a double-screw granulating machine, and producing the sheetthrough a cone-shape double-screw sheet forming machine. The materials are mixed under the heating condition, parts of surfaces of high density polyethylene and the metallocene polyethylene granules are melted and adhered with a great quantity of powder materials, thereby reducing dust in process, improving dispersing effect and solving the aggregation problem in the process.

Description

technical field [0001] The invention relates to a bio-based sheet for food contact and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] With the rapid development of the economy, people's pace of life is gradually accelerating, and their health awareness has also been greatly enhanced. They are also more concerned about the hygienic index requirements of hygienic disposable food packaging materials. At present, most disposable food contact plastics on the market come from traditional non-renewable petrochemical products, which has caused the problem of "white pollution" to become increasingly serious. Countries are vigorously promoting safe and hygienic bio-based plastics as their substitutes. Among bio-based plastics, starch, a natural polymer, has become the focus of research due to its advantages of wide sources, low price, short regeneration cycle, and degradability in various environments. [0003] At ho...

AI Technical Summary

Problems solved by technology

These low-molecular-weight alcohols, lipids, and white oils are easily dissolved in the evaporation residue test and cause hygienic indicators to exceed the standard

After the starch is modified to make plastic products or packaging products, there are no relevant hygienic index test reports in the published literature reports and patent documents. From the perspective of the types and amounts of additives involved, it is not suitable for direct application to food contact. class material

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