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Expandable polylactic acid composite micro-particle with core-shell structure, foamed bead and preparation method of molded piece of expandable polylactic acid composite micro-particle

A technology of composite particles and core-shell structure, which is applied in the field of biodegradable materials, can solve the problems of weak impact resistance protection performance, limiting the use range of foamed polylactic acid materials, and materials that cannot be molded.

Active Publication Date: 2021-09-10
WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the main problems are: 1. Due to the high hardness of the polylactic acid material itself, even if it is made into 30 times the foamed parts, the overall resilience of the parts is relatively poor, and the impact resistance protection performance is weak, to a certain extent Limit the range of use of foamed polylactic acid materials
2. The melt strength of polylactic acid material is poor, and it is easy to be hydrolyzed at high temperature in the kettle-type water phase foaming system
A high porosity rate will seriously affect the molding properties of polylactic acid foamed materials, resulting in the failure of the material to be molded or the severe shrinkage of the molded parts

Method used

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  • Expandable polylactic acid composite micro-particle with core-shell structure, foamed bead and preparation method of molded piece of expandable polylactic acid composite micro-particle
  • Expandable polylactic acid composite micro-particle with core-shell structure, foamed bead and preparation method of molded piece of expandable polylactic acid composite micro-particle
  • Expandable polylactic acid composite micro-particle with core-shell structure, foamed bead and preparation method of molded piece of expandable polylactic acid composite micro-particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: 100 parts by mass of polylactic acid resin, 2 parts by mass of carbodiamine, 1 part by mass of a copolymer of methacrylates and styrene, 0.5 parts by mass of talcum powder, 1 part by mass of 1,3,5- After trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene and 1 mass part of glyceryl stearate are mixed uniformly, they are added to the extruder host. 100 parts by mass of polybutylene adipate / butylene terephthalate copolymer, 3 parts by mass of maleic anhydride grafts, 2 parts by mass of carbodiamine, 1 part by mass of 1,3,5- Trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene and 1 mass part of glyceryl stearate are mixed evenly, and then added to the auxiliary machine of the extruder . The main and auxiliary extruders co-extrude the melt at an extrusion rate ratio of 85:15, and after cooling and pelletizing, expandable polylactic acid composite particles with a core-shell structure are obtained.

[0037] Step 2: Add 100 parts by mass of th...

Embodiment 2

[0040] In addition to adding 3 parts by mass of methacrylate and styrene copolymers as chain extenders in the expandable polylactic acid core layer, the same method as in Example 1 was used to prepare polylactic acid composite beads with a core-shell structure And its foam beads and foam products.

Embodiment 3

[0042] In addition to adding 0.3 parts by mass of methacrylate and styrene copolymers as chain extenders in the expandable polylactic acid core layer, polylactic acid composite beads with a core-shell structure were prepared in the same manner as in Example 1 And its foam beads and foam products.

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Abstract

The invention provides an expandable polylactic acid composite micro-particle with a core-shell structure, a foamed bead and a molded piece thereof through structural design and an efficient co-extrusion technology. According to the invention, the outer layer of the composite foamed bead is a biodegradable elastic polyester skin layer, the main component is a biodegradable high-toughness thermoplastic copolyester elastomer, and good rebound resilience and impact resistance are provided for the composite foamed bead; the inner layer of the composite foamed bead is a biodegradable polylactic acid foaming core layer, and the composite foaming bead is high in compression strength, small in shrinkage rate and good in size stability; and the molded piece prepared by using the biodegradable polylactic acid composite foamed bead has the advantage of low molding energy consumption, excellent rebound resilience, impact resistance and dimensional stability, and is an ideal green packaging material for large-size pieces such as large liquid crystal screens of more than 100 inches, large precise electronic devices and the like, which have strict requirements on the size and also have buffering protection requirements.

Description

technical field [0001] The invention relates to a method for preparing expandable polylactic acid composite particles with a core-shell structure, foamed beads and molded parts thereof, belonging to the field of biodegradable materials. Background technique [0002] According to statistics, the current global annual production of plastics exceeds 330 million tons. Many foamed plastic products are discarded as garbage after use, and some even flow into the ocean and groundwater systems. This has caused serious pollution and harm to the natural environment on which human beings depend. [0003] Therefore, it is imminent to develop green, pollution-free and superior performance biodegradable foamed lightweight materials to replace the above-mentioned traditional foam plastics and promote the transformation and upgrading of the industry to high-end and green environmental protection. [0004] As a green and environmentally friendly biodegradable material, foamed polylactic acid ...

Claims

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Application Information

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IPC IPC(8): C08J9/16C08J9/228C08L67/02C08L67/04
CPCC08J9/16C08J9/228C08J9/0061C08J2367/02C08J2467/04
Inventor 蒋璠晖何若虚史亚杰宋新意熊业志刘缓缓曾佳高浩瑞朱民
Owner WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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