Biodegradable composite material and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and discloses a biodegradable composite material and a preparation method thereof. The composite material is prepared from the following components in parts by weight: 50-80 parts of polylactic acid, 10-30 parts of biodegradable polyester, 1-15 parts of organic modified montmorillonite, 0-5 parts of plasticizer and 0.1-1 part of antioxidant. The preparation method comprises the following steps: weighing 50-80 parts of dried polylactic acid, 10-30 parts of dried biodegradable polyester, 1-15 parts of dried organic modified montmorillonite, 0-5 parts of plasticizer and 0.1-1 part of antioxidant; adding into a high-speed mixer, and blending for 5-10 minutes; and feeding the mixture into a double-screw extruder, performing melt blending and extrusion, performing bar drawing, cooling in water, granulating, and drying to obtain the degradable composite material. The invention can improve the heat resistance of the material, overcome the defects of pure polylactic acid such as low material strength and low toughness, improve the mechanical properties and widen the application area of the material.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a biodegradable composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a polymer material that is chemically synthesized after fermenting lactic acid from biological resources such as corn. After being discarded, it can be completely decomposed into water and carbon dioxide under the action of microorganisms, water, acid, alkali, etc., which is a typical Fully biodegradable plastic without polluting the environment. Due to its good processability and excellent biocompatibility, it is considered to be the most potential biodegradable polymer material. Polylactic acid has good mechanical properties, thermoplasticity, fibrillation and biodegradability, and is easy to process, so it can replace ordinary plastics. At present, polylactic acid is rarely used as a product for practical application, mainly because its own defe...

AI Technical Summary

Problems solved by technology

At present, polylactic acid is rarely used as a practical product, mainly due to its own defects such as low strength, low toughness and low heat resistance temperature, which limit the scope of application.

Chinese patent 200810218680.9 introduces a polylactic acid / starch compatibilized blend material, by adding a small amount of diphenylmethane-4,4-diisoate as a compatibilizer, using twin-screw to plasticize the blend material, Composite materials are prepared by kneading, uniformly mixing and completing chemical reactions. This method improves the degradation performance of the material, but its mechanical properties still need to be improved

Chinese patent 200510030494.9 discloses a preparation method of a polylactic acid nanocomposite material. First, polylactic acid and organically modified montmorillonite are melt-blended to obtain a masterbatch, and then the masterbatch and polylactic acid are melt-blended to obtain a composite material. The mechanical properties are improved, and the Vicat softening point is also increased, but its production process is complicated, requiring two twin-screw melt blending extrusions

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