Biodegradable modified polylactic acid membrane and preparation method thereof

Abstract

The invention provides a biodegradable modified polylactic acid membrane, comprising, by weight, 50-60 parts of polylactic acid, 1-5 parts of an organic crystallizing nucleating agent, 1-2 parts of aninorganic filler, 1-20 parts of soft degradable polyester, 0.2-1 part of a thermal stabilizer, 0.2-1 part of a plasticizer, 0.5-1.2 parts of an antioxidant, 0.2-1 part of a lubricant, and 0.5-5 partsof nano cellulose. The above materials are added in a high-speed mixer according to the parts ratio by weight; after uniform mixing, extrusion granulating is performed with an extruder; film blowingis performed to produce the biodegradable modified polylactic acid membrane. The polylactic acid molecules in the biodegradable modified polylactic acid components can be bound quickly around the nucleating agent to allow quick crystallization; the nucleating agent and the polylactic acid molecules are well compatible during quick crystallization, so that mechanical properties of the membrane areimproved in the whole. In addition, a preparation method of the biodegradable modified polylactic acid membrane is simple, and the biodegradable modified polylactic acid membrane is good in processibility, low in cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of biological materials, and in particular relates to a biodegradable modified polylactic acid film and a preparation method thereof. Background technique [0002] In recent years, with the depletion of fossil energy, the massive discharge of industrial toxic and harmful gases, and the excessive use of non-degradable materials, the global environment has been severely damaged. Researchers all over the world are seeking new degradable materials to deal with resource and environmental crises. . Polylactic acid products are green and environmentally friendly. More importantly, they can be degraded by microorganisms when they lose their value. They have excellent biodegradability, biocompatibility and good plasticity. They are currently the most promising polymer materials. However, under normal conditions, polylactic acid products are hard and brittle, and their impact resistance is poor, which greatly restric...

AI Technical Summary

Problems solved by technology

[0003] Based on the above prior art, the object of the present invention is to provide a biodegradable modified polylactic acid film and its preparation method, by adding organic crystal nucleating agent, inorganic filler and soft degradable polyester to polylactic acid The biodegradable modified polylactic acid film is obtained by mixing, extruding, and film blowing, which solves the technical problems of existing polylactic acid products such as hard and brittle, poor impact resistance, etc.

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