Bubble assisted method for fast stripping plastic-aluminum composite material

A composite material, aluminum-plastic technology, applied in the direction of plastic recycling, educts, reagents, etc., can solve the problems of reducing recycling economy, low recycling rate of aluminum foil, and reducing the value of recycling, so as to improve the value of recycling and benefit industrial production , the effect of reducing environmental pollution

Inactive Publication Date: 2009-07-08
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are mainly: one, as described in the Chinese patent application with the publication number CN1337280A, using the principle that both metal aluminum and aluminum oxide can be dissolved in acid or alkali, the aluminum in the material is dissolved by an acid-soluble or alkali-soluble method, Thereby recycling plastics, and then making aluminum-containing waste liquid into polyaluminum chloride or aluminum sulfate, this method will not be able to obtain aluminum foil, which reduces the value of recycling, and this method has rarely been used to separate aluminum-plastic composite materials; the second is Use acidic substances to penetrate into the plastic layer, first dissolve the interface (aluminum oxide) between the plastic and aluminum, and then add a certain oxidant to protect the aluminum, so that part of the aluminum foil and plastic can be obtained. In this method, strong acidic substances are selected. Be that nitric acid is selected in CN1401443A Chinese patent application as publication number, be that sulfuric acid or phosphoric acid etc. are selected in CN101054446A Chinese patent application in publication number, in the aluminum-plastic separation research of document aluminum-containing waste plastics (Gu Guohua, Zhang Bo, mining and metallurgy engineering, 27 ( 5): 47-50, 2007) used hydrochl

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] In a 1000ml jacketed glass kettle, add 500ml of sodium lauryl sulfate with a concentration of 0.1% by mass and an aqueous solution of acetic acid with a concentration of 15% by mass, and then add 100g of water that can pass through the sieve of a crusher with a diameter of 10-15 mm. Aluminum-plastic composite material fragments, heat medium is introduced into the jacketed kettle, the temperature is increased, and air is introduced at a flow rate of 200ml / min to form bubbles, the temperature is 80℃, and the temperature is kept for 25min. The aluminum and plastic are completely separated. After filtering Obtain a mixture of aluminum fragments and plastic fragments, then place it in a pool for flotation to separate aluminum and plastic (plastic floats on the water surface, while aluminum sinks at the bottom of the pool), dry the aluminum and plastic separately, and weigh 19.9g aluminum foil, 79.9g plastic.

Example Embodiment

[0031] Example 2

[0032] In a 1000ml jacketed glass kettle, add 500ml containing 0.5% by mass concentration of dodecylphenol polyoxyethylene ether and 20% by mass concentration of acetic acid aqueous solution, and then add 100g which can pass through the pulverization of 10-15mm in diameter For the aluminum-plastic composite material fragments of the machine sieve, pass a heating medium into the jacketed kettle, increase the temperature, and at the same time pass nitrogen gas at a flow rate of 200ml / min to form bubbles. The temperature reaches 90℃ and keeps it for 20min. The aluminum and plastic are completely Separate, filter to obtain a mixture of aluminum fragments and plastic fragments, then place it in a pool for flotation to separate aluminum and plastics (plastics float on the water surface, while aluminum sinks on the bottom of the pool), dry the aluminum and plastics separately, and weigh 19.9g Aluminum foil, 79.9g plastic.

Example Embodiment

[0033] Example 3

[0034] In a 1000ml jacketed glass kettle, add 500ml of sodium lauryl sulfate with a concentration of 1% by mass and an aqueous solution of acetic acid with a concentration of 50% by mass, and then add 100g of water that can pass through the sieve of a crusher with a diameter of 10-15 mm. Aluminum-plastic composite material fragments, heat medium is passed into the jacketed kettle, the temperature is increased, and carbon dioxide gas is passed in at a flow rate of 200ml / min to form bubbles. The temperature is 80°C and kept for 15min. The aluminum and plastic are completely separated. The mixture of aluminum fragments and plastic fragments is filtered and placed in a pool for flotation to separate aluminum and plastic (plastic floats on the water surface, while aluminum sinks on the bottom of the pool), dry the aluminum and plastic separately, and weigh 19.9g aluminum foil, 79.9 g plastic.

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PUM

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Abstract

The invention discloses a method for bubble-aided quick peeling off of aluminum plastic composite materials. The method comprises: crushing the aluminum plastic composite material into pieces and placing the pieces in a separating agent; introducing gas into every liter of the separating agent at a flow speed of 50 to 500ml/min and heating to 80 to 90 DEG C; keeping the temperature for 10 to 40min to completely separate aluminum from plastic; then, respectively obtaining aluminum and plastic through filtration, floatation separation and drying; the gas is inert relative to the separating agent; and the separating agent comprises the following components in percentage by weight: 10 to 99.9 percent of organic carboxylic acid, 0.1 to 1 percent of surfactant and the balance being water. The method does not need special equipment and has simple operation and low cost; therefore, the method is propitious to industrial production and can realize respective reclaiming of aluminum and plastic, thereby not only improving the recycling value of the aluminum plastic composite material, but also reducing environmental pollution caused by wastes.

Description

technical field [0001] The invention relates to a separation method of aluminum-plastic composite materials, in particular to a method for rapidly destroying the force between aluminum foil and plastic in aluminum-plastic composite materials by using a chemical method and the combined action of air bubbles to realize automatic peeling of aluminum foil and plastic, and belongs to the field of environmental protection . Background technique [0002] The aluminum-plastic composite packaging material is a composite material with a multi-layer structure made of aluminum foil and plastic by heat pressing or bonding. The composite material not only utilizes the characteristics of soft texture, good ductility, easy processing, good barrier property, light and beautiful appearance of aluminum foil, but also utilizes the characteristics of easy processing, acid and alkali corrosion resistance and good strength of plastic. Aluminum-plastic composite packaging materials have the charac...

Claims

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Application Information

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IPC IPC(8): C08J11/04B29B17/02
CPCY02P20/143Y02W30/62
Inventor 雷华李振华鲁阳陈建党董圣航
Owner ZHEJIANG UNIV
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