A method for forming concba lamellar structure with degradable plastics PLA

A technology for degrading plastics and layered structures is applied in the field of degradable plastics PLA to form shell layered structures, which can solve problems such as affecting the reinforcement effect and affecting the performance of materials.

Inactive Publication Date: 2008-04-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A method for forming concba lamellar structure with degradable plastics PLA
  • A method for forming concba lamellar structure with degradable plastics PLA
  • A method for forming concba lamellar structure with degradable plastics PLA

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At 150-200°C and injection pressure of 60bar to 160bar, plastic degradable PLA specimens were injected; the injected PLA specimens were cut into cuboid shapes of 35mm×10mm×4mm; the prepared PLA specimens were placed Into the middle of the mold cavity with a cavity of 80mm×10mm×4mm; press at 50°C and a pressure of 1.2GPa for 5 minutes, and solid-state molding to form PLA with a microscopic shell layer structure. Figure 1 is the microstructure of the PLA spline prepared by injection molding, Figures 2 and 3 are the shell-like microstructure of PLA after solid-state molding, and Figure 4 is the microstructure of the shell-like layered structure.

Embodiment 2

[0032] At 150-200°C and injection pressure of 60bar to 160bar, plastic degradable PLA specimens were injected; the injected PLA specimens were cut into cuboid shapes of 35mm×10mm×4mm; the prepared PLA specimens were placed Into the middle of the mold cavity with a cavity of 80mm×10mm×4mm; keep it at 110°C and a pressure of 300MPa for 5 minutes, and solid-state molding to form PLA with a microscopic shell layer structure. The mechanical properties of PLA splines without heat treatment after molding The performance is as follows:

[0033] Crystallization time of the bar at 100°C

Embodiment 3

[0035] At 150-200°C and injection pressure of 60bar to 160bar, plastic degradable PLA samples were injected; the injected PLA samples were cut into cuboid shapes of 35mm×10mm×4mm; the prepared PLA samples were placed Into the middle of the mold cavity with a cavity of 80mm×10mm×4mm; place the PLA billet that has been crystallized for 40 minutes at 110°C, change the pressure and keep it for 5 minutes (the cross-sectional appearance is shown in Figures 5, 6, and 7), and the sample without heat treatment after molding The mechanical properties of the strips are as follows:

[0036] Processing pressure of spline (MPa) Impact strength of spline (kJ / m 2 )

[0037] 0 13.39

[0038] 75 22.45

[0039] 150 38.03

[0040] 250 46.25

[0041] 375 37.91

[0042] 600 40.82

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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...

Claims

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Application Information

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IPC IPC(8): B29C69/00B29C45/76B29C43/58B29C43/36B29C71/02B29K67/00
Inventor 余木火焦明立高朋滕翠青韩克清袁象恺
Owner DONGHUA UNIV
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