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A lightweight conductive and heat-insulating composite material and its preparation method and system

A technology of composite materials and conductive materials, applied in the field of polymer or plastic-based composite materials, can solve the problems of increasing the viscosity of polymer matrix, secondary pollution of electromagnetic radiation, and difficulty in forming and processing, and achieve high conductive filler content and simple preparation method , the effect of low density

Active Publication Date: 2020-08-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this composite material and its preparation method include: (1) in order to achieve the purpose of conductivity, it is usually necessary to add a very high content of conductive filler; (2) the addition of a large amount of conductive filler significantly increases the viscosity of the polymer matrix, giving The late forming process brings many difficulties; (3) The density of conventional polymer-based conductive composite materials is high and the thermal insulation performance is poor
(4) The electromagnetic shielding of conventional polymer-based conductive composite materials is mainly based on the reflection of the surface of the composite material, and there is a problem of secondary pollution of electromagnetic radiation

Method used

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  • A lightweight conductive and heat-insulating composite material and its preparation method and system
  • A lightweight conductive and heat-insulating composite material and its preparation method and system
  • A lightweight conductive and heat-insulating composite material and its preparation method and system

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Effect test

Embodiment 1

[0054] Attached figure 2 The bead foaming equipment shown is used to prepare porous plastic particles. The raw material is granular polypropylene with an equivalent diameter of about 3mm. The melt index, density and melting point of polypropylene are 20g / 10min (@220℃ / 10kg) , 0.91g / cm 3 (@23°C), 165.8°C; the blowing agent is carbon dioxide with a purity of 99.8%. The concrete foaming process is as follows: the 1st step, add 700 milliliters of waters in the autoclave, account for 70% of whole still chamber volume; The 2nd step, add 50 grams of granular polypropylene in the still again; Put carbon dioxide foaming agent into the kettle, set the pressure of carbon dioxide to 15MPa, and set the temperature of the kettle to 155°C; step 4, after the temperature and pressure of the system reach the set level, maintain the set temperature and pressure 30 minutes, then open the ball valve to quickly remove the pressure in the kettle, so that the solid plastic particles in the kettle w...

Embodiment 2

[0059] Attached figure 2 The bead foaming equipment shown prepares porous plastic particles. The raw material is granular polylactic acid with an equivalent diameter of about 2.5 mm. The melting index, density, and melting point of polylactic acid are 18g / 10min (@220°C / 10kg) , 1.24g / cm 3 (@23°C), 176.0°C; the blowing agent is carbon dioxide with a purity of 99.8%. The specific foaming process is as follows: in the first step, add 700 milliliters of water to the autoclave, accounting for 70% of the volume of the whole still cavity; in the second step, add 70 grams of granular polylactic acid to the still; Put carbon dioxide foaming agent into the kettle, set the pressure of carbon dioxide to 20MPa, and set the temperature of the kettle to 145°C; step 4, after the temperature and pressure of the system reach the set level, maintain the set temperature and pressure 45 minutes, then open the ball valve to quickly remove the pressure in the kettle, so that the solid plastic part...

Embodiment 3

[0063] Attached figure 2 The bead foaming equipment shown prepares porous plastic particles. The raw material is granular thermoplastic polyurethane with an equivalent diameter of about 1.5 mm. The melt index, density, and glass transition temperature of polystyrene are 25 g / 10 min (@220 °C / 10kg), 1.21g / cm 3 (@23°C), 164.7°C; the blowing agent is carbon dioxide with a purity of 99.8%. Concrete foaming process is as follows: the 1st step, in autoclave, add 700 milliliters of waters, account for 70% of whole still chamber volume; Put carbon dioxide foaming agent into the kettle, set the pressure of carbon dioxide to 18MPa, and set the temperature of the kettle to 112°C; step 4, after the temperature and pressure of the system reach the set level, maintain the set temperature and pressure 45 minutes, then open the ball valve to quickly remove the pressure in the kettle, so that the solid plastic particles in the kettle expand and foam, thereby obtaining porous thermoplastic po...

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Abstract

The invention discloses a lightweight conductive thermal-insulation composite material as well as a preparation method and system thereof. The lightweight conductive thermal-insulation composite material comprises a porous plastic substrate and a continuous reticular conductive material which wraps the whole substrate and is embedded into the substrate. The method comprises steps as follows: step(1), a plurality of porous plastic particles are prepared; step (2), the surface of each porous plastic particle is coated with the conductive material; the porous plastic particles prepared in the step (1) are soaked in a powdery conductive material suspension, then the porous plastic particles are taken out from the solution and surfaces of the particles are dried, and the surface of each porousplastic particle is coated with a layer of conductive material; step (3), the porous plastic particles are bonded; the outer surfaces of the porous plastic particles are heated and molten, so that the porous plastic particles are bonded to form a whole body in a certain geometrical shape, and finally, the lightweight conductive thermal-insulation composite material which is provided with the porous plastic as the substrate and the 3D reticular conductive material embedded into the substrate is obtained.

Description

technical field [0001] The present invention relates to a lightweight conductive and heat-insulating composite material and a preparation method thereof, in particular to a lightweight conductive and heat-insulating composite material with porous plastic as a matrix and a composite material combining foaming, coating and steam molding The preparation method belongs to the technical field of polymer or plastic-based composite materials. Background technique [0002] Sustainable development, characterized by low carbon, low consumption, high efficiency and energy saving, and green environmental protection, has become a major issue of global concern. Composite materials and their products with lightweight, conductive, and heat-insulating properties are not only conducive to saving materials, but also conducive to energy saving and emission reduction. They are a typical green and environmentally friendly material. , information electronics and other industrial fields have impor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40C08J9/224C08L23/12C08L67/04C08L75/04
CPCC08J9/224C08J9/40C08J2323/12C08J2367/04C08J2375/04
Inventor 王桂龙赵国群董桂伟张磊
Owner SHANDONG UNIV