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Method for fast stripping plastic-aluminum composite material by supercritical CO2 fluid

A composite material and supercritical technology, applied in the field of environmental protection, can solve unseen problems and achieve the effect of low cost, good quality and abundant sources

Inactive Publication Date: 2011-02-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Due to supercritical CO 2 These characteristics of the fluid, supercritical CO 2 It has been widely used in the field of extraction, such as the extraction of active ingredients in food, medicine, spices, etc. It has played a huge role; it has also been applied in other fields such as polymer science and environmental protection, but supercritical CO 2 The separation applied to aluminum-plastic composite materials has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In a jacketed high-pressure vessel with a volume of 1000mL, add 100.0g of aluminum-plastic composite material fragments (wherein the plastic layer is polyethylene) that can pass through the sieve hole of a pulverizer with a diameter of 10-15mm, and then pour it into the high-pressure vessel at room temperature. Pump in carbon dioxide until the pressure in the high-pressure vessel reaches 25MPa, raise the temperature of the high-pressure vessel to 80°C, and repeatedly release and boost the pressure of carbon dioxide to stabilize the pressure in the high-pressure vessel at 25MPa. After the pressure in the high-pressure container is stabilized at 25MPa, keep it for 20 minutes, and then quickly release the pressure to normal pressure for desorption. Through visual observation, the aluminum and plastic are completely separated. Take out the separated aluminum-plastic fragments, place the aluminum foil and plastic in a pool to float the aluminum foil and plastic, dry the alumi...

Embodiment 2

[0043] In a jacketed high-pressure vessel with a volume of 1000ml, add 100.0g of aluminum-plastic composite material fragments (wherein the plastic layer is polyethylene) that can pass through the sieve hole of a pulverizer with a diameter of 10-15mm, and then pour it into the high-pressure vessel at room temperature. Pump carbon dioxide until the pressure in the high-pressure vessel reaches 15MPa, raise the temperature of the high-pressure vessel to 80°C, and repeatedly release and boost the pressure of carbon dioxide to stabilize the pressure in the high-pressure vessel at 15MPa. After the pressure in the high-pressure container is stabilized at 15MPa, keep it for 30 minutes, and then quickly release the pressure to normal pressure for desorption. Through visual observation, the aluminum and plastic are completely separated. Take out the separated aluminum-plastic fragments, place the aluminum foil and plastic in a pool to float the aluminum foil and plastic, dry the aluminum...

Embodiment 3

[0045] In a jacketed high-pressure vessel with a volume of 1000ml, add 100.0g of aluminum-plastic composite material fragments (wherein the plastic layer is polyethylene) that can pass through the sieve hole of a pulverizer with a diameter of 10-15mm, and then pour it into the high-pressure vessel at room temperature. Pump carbon dioxide until the pressure in the high-pressure vessel reaches 15MPa, raise the temperature of the high-pressure vessel to 60°C, and repeatedly release and boost the pressure of carbon dioxide to stabilize the pressure in the high-pressure vessel at 15MPa. After the pressure in the high-pressure container is stabilized at 15MPa, keep it for 40 minutes, and then quickly release the pressure to normal pressure for desorption. Through visual observation, the aluminum and plastic are completely separated. Take out the separated aluminum-plastic fragments, place the aluminum foil and plastic in a pool to float the aluminum foil and plastic, dry the aluminum...

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PUM

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Abstract

The invention discloses a method for rapidly separating a aluminum-plastic composite material by supercritical CO2 fluid. The method comprises the following steps: sealing debris of the aluminum-plastic composite material and carbon dioxide in a high pressure vessel, pressurizing or heating so that pressure in the high pressure vessel is greater than 7.39Mpa, or the temperature is more than 31.06DEG C and less than fusion temperature of plastic in the aluminum-plastic composite material, keeping the pressure and temperature for a period; then allowing depressurizing and desorption so as to totally separate aluminum from plastic, and performing flotation separation and drying to obtain the aluminum and the plastic respectively. The method has the advantages of environmental protection, high efficiency and low cost, and is applicable to industrial production.

Description

technical field [0001] The invention relates to a separation method of aluminum-plastic composite materials, in particular to the use of supercritical CO 2 The invention relates to a method for quickly stripping aluminum-plastic composite materials by fluid, which belongs to the field of environmental protection. Background technique [0002] Aluminum-plastic composite material is a composite material with multi-layer structure formed by thermal pressing or bonding of aluminum foil and plastic. The simplest composition structure is: plastic / aluminum foil / plastic. Sometimes in order to improve the bonding strength of plastic and aluminum foil, An adhesive will be used between the aluminum foil and the plastic, thus forming a five-layer structure: plastic / adhesive layer / aluminum foil / adhesive layer / plastic, and for aluminum foil, due to its easy oxidation, there is actually a layer on its surface. layer of stable alumina. [0003] Aluminum-plastic composite materials not onl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/06
CPCB29B17/02B29L2009/003B29B2017/0416B29K2705/02Y02W30/62
Inventor 雷华李振华鲁阳陈建党董圣航
Owner ZHEJIANG UNIV
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