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

Abstract

The invention discloses a flame-retardant polylactic acid and starch compound fully-degradable plastic film, which is characterized by being made from the following raw materials, by weight part, 80-85 of polylactic acid, 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, 1-2 of stearic acid, 5-6 of red phosphorus, 2-3 of attapulgite, 2-3 of zinc borate, 1-2 of rosin pentaerythrityl ester and a proper amount of absolute alcohol. In a process of internal mixing of polylactic acid, the added red phosphorus, attapulgite and zinc borate has a compound effect and a high-temperature-resistant and flame-retardant effect, and the whole cost of the plastic film is greatly reduced. The plastic film is good in flame retardance, toughness and mechanical properties, and is sturdy and durable. The method is innovative in technology and convenient for industrial control. The plastic film has a high degradation speed and can be widely applied.

Description

technical field [0001] The invention relates to the technical field of plastic films, in particular to a fully degradable plastic film composited with flame-retardant 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, hydrophobicity, easy molding and processing, and can be completely Degradation, the degradation products are non-toxic and harmless to the human body, come f...

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, the problem of poor compatibility with polylactic acid is solved, and the strength and toughness of the composite material are improved at the same time; finally, red phosphorus, attapulgite, zinc borate, etc. It has the effect of high temperature resistance and flame retardancy, and at the same time can greatly reduce the overall cost of the product, which is conducive to the promotion and application of fully biodegradable plastics