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PLA/PCL conductive composite material and preparation method and application thereof

A technology of conductive composite material and conductive filler is applied in the field of PLA/PCL conductive composite material and its preparation, which can solve the problems such as inability to effectively reduce cost and large amount, and achieve the effects of excellent electromagnetic shielding performance, broad application prospect and simple preparation method.

Active Publication Date: 2021-05-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the added phase composition is low, it is easy to form a separate phase, and the conductive filler cannot form an effective conductive channel in it
When the added component is high, a double-layer porous structure is formed. In order to form a more effective conductive network, a large amount of conductive filler is still required, which cannot effectively reduce the cost.

Method used

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  • PLA/PCL conductive composite material and preparation method and application thereof
  • PLA/PCL conductive composite material and preparation method and application thereof
  • PLA/PCL conductive composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides PLA / PCL composite material and its preparation method.

[0037] Firstly, the silicon dioxide is first melted and blended with the PLA matrix based on the polymer material plasticizing and transporting equipment based on extensional rheology to prepare a masterbatch. The silicon dioxide is controlled to account for 6 wt% of the PLA mass fraction, and the temperature of each section is 170 ℃, 190°C, 190°C, 190°C, 190°C, the rotor speed is 45 rpm, and then mix the masterbatch with PCL and carbon nanotubes (keep PLA:PCL=70:30, carbon nanotubes account for the composite material The mass fractions are respectively 0.1%, 0.3%, 0.4%, 0.5%, 0.7%, 1% and 3%), mixed in a high-speed mixer (rated speed is 20000r / min) for 5 minutes, then in the same processing technology Next, extrude, cool, air-dry, pelletize, and dry to obtain a PLA / PCL composite material with silica and conductive filler added.

[0038] The above materials were dried in a vacuum drying o...

Embodiment 2

[0049] This embodiment provides PLA / PCL composite material and its preparation method.

[0050] Firstly, the silicon dioxide is melt-blended with the PLA matrix based on polymer material plasticizing and transporting equipment based on extensional rheology to prepare a masterbatch, and the mass fraction of silicon dioxide in PLA is controlled to be 2wt% and 10wt%, respectively. The temperature was 170°C, 190°C, 190°C, 190°C, 190°C, the rotor speed was 45 rpm, and then the masterbatch, PCL and carbon nanotubes were mixed (keep PLA:PCL=70:30, carbon nanotubes The pipe accounts for 1% of the mass fraction of the composite material), mixed in a high-speed mixer (rated speed is 20000r / min) for 5 minutes, then under the same processing technology, extrusion molding, cooling, air-drying, pelletizing, drying, A PLA / PCL composite material added with silica and conductive filler was obtained.

[0051] As a comparison, the PLA / PCL composite material was prepared according to the above p...

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Abstract

The invention discloses a PLA / PCL conductive composite material as well as a preparation method and application thereof. The PLA / PCL conductive composite material is prepared from the following components in parts by mass: 60 to 90 parts of polylactic acid, 10 to 40 parts of polycaprolactone, silicon dioxide and conductive filler, wherein the silicon dioxide accounts for 2-10% of the mass of the polylactic acid, and the conductive filler accounts for 0.1-3% of the mass of the composite material. The silicon dioxide can improve the viscoelasticity of the PLA, so that the PCL phase is changed into a continuous phase from an isolated phase, and the carbon nanotube conductive filler is only distributed in the PCL phase, so that a conductive path is formed, and the conductivity of the obtained composite material is remarkably improved. The obtained conductive composite material has an ultra-low percolation value at room temperature, the percolation value is improved by one time or more compared with a common blended material, meanwhile, other mechanical properties of the material can be kept, and the application prospects in the fields of sensing, electromagnetic shielding, static electricity prevention and the like are wide.

Description

technical field [0001] The invention belongs to the technical field of preparation of polymer materials, and in particular relates to a PLA / PCL conductive composite material and its preparation method and application. Background technique [0002] Polylactic acid (PLA) is the most popular degradable biomass material. The raw materials come from various biomass materials. In addition to being biocompatible and renewable, it also has gloss, transparency, high strength, breathability, and Processing and other advantages. Widely used in the field of automobiles, disposable products, electronics, and biomedicine. However, due to the inherent brittleness, low crystallinity and poor heat resistance of PLA, its application is limited. Therefore, it is necessary to increase the toughness of PLA and improve its heat resistance. Among them, in order to improve the toughness of PLA, many studies on blending systems have been carried out at home and abroad, such as PLA / PCL, PLA / PBS, P...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K3/36C08K3/04
CPCC08K2201/005C08K2201/011C08L67/04C08L2205/025C08K3/36C08K3/041
Inventor 何和智刘宇帆
Owner SOUTH CHINA UNIV OF TECH
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