Hydrophobic polylactic acid and starch compound fully-degradable plastic film and manufacturing method thereof

Abstract

The invention discloses a hydrophobic polylactic acid and starch compound fully-degradable plastic film, which is characterized by being made from the following raw materials, by weight part, 70-75 of polylactic acid, 10-12 of propylene carbonate, 20-25 of corn starch, 12-14 of glycerin, 1.6-2 of epichlorohydrin, a proper amount of a sodium hydroxide solution with the concentration being 1 mol / L, a proper amount of hydrochloric acid with the concentration being 1 mol / L, a proper amount of distilled water, 25-30 of hemp fibers, 0.8-1 of a silane coupling agent kh-550, 1.5-2 of an antioxidant 1010, 6-7 of white petrolatum and 1-2 of glyoxal. Components including polylactic acid, propylene carbonate, and white petrolatum are pre-mixed and subjected to inner mixing molding, and hydrophobic components can be fully uniformly dispersed, and therefore, surface hydrophobicity of the plastic film is improved and vapor permeability is reduced. The plastic film is low in cost and convenient to manufacture, and can be used as preservative films, food storage bags or food package bags.

Description

technical field [0001] The invention relates to the technical field of plastic films, in particular to a fully degradable plastic film composited with hydrophobic polylactic acid and starch and a preparation method thereof. Background technique [0002] In order to reduce the use of petroleum-based plastic materials, protect the environment, and alleviate the increasingly severe shortage of petroleum resources, the development and utilization of bio-based degradable and environmentally friendly plastic materials has become the focus of research in the field of packaging materials. [0003] Polylactic acid material is one of the most widely used degradable plastic materials at present. As a packaging film material, PLA has good transparency, mechanical properties and biocompatibility, high strength, thermoplasticity, easy molding and processing, and can be completely degraded. The product is non-toxic and harmless to the human body, comes from renewable resources, and is easy...

AI Technical Summary

Problems solved by technology

In the present invention, the silane coupling agent kh-550 is used to pretreat the hemp fiber, thereby improving the interface contact effect and compatibility, and improving the mechanical properties of the material; then modifying the cornstarch through a series of processes and adding In the overall product, it solves the problem of poor compatibility with polylactic acid, improves the strength and toughness of the composite material, and can greatly reduce the overall cost of the product. Finally, the hydrophobicity of the components is modified by adding white petrolatum and glyoxal. properties, so that the overall hydrophobicity of the film is improved