A method for forming concba lamellar structure with degradable plastics PLA

Abstract

The invention discloses a method, by which the biodegradable plastic PLA can form a shell-like samdwich structure; the method includes the following steps: firstly, under the temperature of 150-200 DGE C and the injection pressure of 60 bar -160 bar, the sample of the biodegradable plastic PLA can be molded; secondly, the molded sample of the biodegradable plastic PLA can be cut into a rectangular block of 35 mm * 10mm * 4mm; thirdly, the prepared sample of the biodegradable plastic PLA is put in the cavity of a module, under the temperature of 0-170 DGE C, the pressure of 0-1000 MPa, and the time of 0-150 min, the polymer begins to flow induced by low temperature and pressure to form the PLA with the micro shell-like samdwich structure. The method improves the appearance performance of the products and the mechanical properties of the material, such as the ability of impacting, stretching and bending, and fully enhances the application of PLA used as material.

Description

technical field [0001] The invention belongs to the field of structural biomimetic preparation of polymer materials, in particular to a method for forming a shell layered structure from degradable plastic PLA. Background technique [0002] Polylactic acid (PLA), as a biodegradable and renewable biopolymer material, has attracted a lot of research by researchers, but the brittleness of PLA material limits its application. Generally, the brittleness of PLA materials is improved by blending, copolymerization, and compounding, and the mechanical properties of polymer materials are increased through reasonable orientation and arrangement of multi-scale structures. For example, spider silk composed of proteins can become the polymer material with the best toughness. , the most common polyethylene can prepare high-strength high-modulus fibers with higher specific strength than steel. In recent years, with the study of biological structures, structural bionics has received extensiv...

AI Technical Summary

Problems solved by technology

[0004] Generally speaking, at the macroscopic level, layered fabric reinforced polymer composites play an important role in many fields that require strong and light materials; at the micron level, inorganic silicates (such as montmorillonite) are used as reinforcing materials In the nanocomposite material formed with the polymer matrix, the lamellar clay is exfoliated and dispersed evenly in the polymer matrix through intercalation, which endows the material with high strength and stiffness; at the nanometer level, graphite single molecule (graphene) sheet The composite material formed by the polymer-like unit structure and the polymer endows the material with excellent mechanical properties; at the molecular level, the synthetic material of the flexible molecular chain reinforced by aromatic sheet-like molecules also has excellent mechanical properties, but this addition of sheet-like reinforcement The formed composite materials generally have random orientation of sheet-like structural units, which affects the reinforcement effect, and the defects of the material are caused by agglomeration, which affects the performance of the material.

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