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Modified polylactic acid composite material capable of being quickly crystallized and preparation method thereof

A technology of crystallization modification and composite materials, applied in the field of polylactic acid composite materials, can solve the problems of the destruction of the full biodegradability of composite materials, change the nature of the modification of composite materials, etc. The effect of temperature performance

Pending Publication Date: 2020-03-24
湖南省菱越新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although filling and blending can improve the heat resistance of composite materials to a certain extent, the content of fillers in the filling and blending process is usually high, and the characteristics and essence of composite materials will change greatly. For example, through polylactic acid and polypropylene Dilute blending can greatly improve the heat resistance of the composite material, but the full biodegradability of the composite material is destroyed, which changes the nature of the composite material modification

Method used

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  • Modified polylactic acid composite material capable of being quickly crystallized and preparation method thereof
  • Modified polylactic acid composite material capable of being quickly crystallized and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] This embodiment provides a method for preparing a rapidly crystallizable modified polylactic acid composite material, comprising the following steps:

[0029] S1. Put the raw materials into a mixer and mix them. The mass fraction of each component in the raw materials is as follows: polylactic acid: 95%, 8000 mesh talcum powder: 4%, acetyl tributyl citrate: 0.3%, ethylene bis stearamide : 0.7%, the speed of the mixer is 1500rpm, and the time is 30min;

[0030] S2. Pour the mixture into the parallel twin-screw extruder and extrude and granulate by means of strands;

[0031] S3. Put the pellets into a mold for injection molding, the temperature of the injection mold is 105°C, the temperature difference between the inner surface of the mold is controlled at ±0.5°C, and the thickness of the injection molded product is 2mm.

Embodiment 2

[0033] This embodiment provides a method for preparing a rapidly crystallizable modified polylactic acid composite material, comprising the following steps:

[0034] S1. Put the raw materials into a mixer and mix them. The mass fraction of each component in the raw materials is as follows: Polylactic acid: 85%, 5000 mesh barium sulfate: 10%, adipic acid dihydrazide: 3%, ethylene bisstearamide : 2%, the mixer speed is 1400rpm, and the time is 15min;

[0035] S2. Pour the mixture into the parallel twin-screw extruder and extrude and granulate by means of strands;

[0036] S3. Put the pellets into a mold for injection molding, the temperature of the injection mold is 85°C, the temperature difference between the inner surface of the mold is controlled at ±2°C, and the thickness of the injection molded product is 2mm.

Embodiment 3

[0038] This embodiment provides a method for preparing a rapidly crystallizable modified polylactic acid composite material, comprising the following steps:

[0039] S1. Put the raw materials into a mixer and mix them. The mass fraction of each component in the raw materials is as follows: polylactic acid: 97.8%, 6000 mesh calcium carbonate: 0.1%, dibenzoyl phosphate amine: 2%, ethylene bis stearamide : 0.1%, the speed of the mixer is 1200rpm, and the time is 5min;

[0040] S2. Pour the mixture into the parallel twin-screw extruder and extrude and granulate by means of strands;

[0041] S3. Put the pellets into a mold for injection molding, the temperature of the injection mold is 130°C, the temperature difference between the inner surface of the mold is controlled at ±10°C, and the thickness of the injection molded product is 2mm.

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Abstract

The invention discloses a modified polylactic acid composite material capable of being quickly crystallized. The modified polylactic acid composite material comprises polylactic acid, a dispersion lubricant and a nucleating agent, wherein the nucleating agent is an inorganic nucleating agent and / or an organic nucleating agent; the preparation method comprises the steps of mixing, granulating and injection molding. The organic nucleating agent and the inorganic nucleating agent are introduced, rapid crystallization of the polylactic acid composite material is achieved through the synergistic effect of inorganic components, and the crystallinity of the composite material is improved, wherein the inorganic nucleating agent does not melt in the processing and forming process of the composite material and exists in a solid form, the material is adsorbed on the surface of the inorganic nucleating agent, and a role is played in heterogeneous nucleation in the crystallization process. And theorganic nucleating agent mainly plays a role in homogeneous nucleation in the processing process. Through the synergistic effect of the two nucleating agents, the crystallization speed of the composite material can be increased, and the crystallinity is improved.

Description

technical field [0001] The invention relates to the technical field of polylactic acid composite materials, and more specifically, to a rapidly crystallizable modified polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid is a bio-based and fully biodegradable environmentally friendly material prepared from natural starch as the main raw material through biological fermentation and chemical polymerization. Get fast promotional applications. However, the heat resistance of pure polylactic acid is poor, and the heat distortion temperature is only about 55°C. This shortcoming limits its application in many occasions, especially in the field of daily necessities where the market consumption is particularly large. [0003] Polylactic acid is a semi-crystalline polymer, and its poor temperature resistance is mainly due to the failure of polylactic acid molecules to form a crystalline structure in the microscopically reg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K13/02C08K3/34C08K5/11C08K5/20C08K3/30C08K5/25C08K5/5313
CPCC08K3/30C08K3/34C08K5/11C08K5/20C08K5/25C08K5/5313C08K13/02C08K2003/3045C08L2201/08C08L2205/24C08L67/04
Inventor 曾广胜江太君尹琛孟聪陈一胡灿刘水长
Owner 湖南省菱越新材料有限公司
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