Aluminum-plastic composite packing separating agent and method of separating and reclaiming the same

Abstract

The invention discloses a release agent of aluminum composite packing and the recovery method thereof. Said aluminum composite packing release agent is composed of sulfuric acid or phosphoric acid with a concentration of 5-20% and oxidizer. It applies as following steps: soaking the aluminum composite packing material in the sulfuric acid or phosphoric acid with a concentration of 5-20% at 40-80 DEG C, 0.1-0.5% cationic surfactant or only in the release agent containing sulfuric acid or phosphoric acid with a concentration of 5-20%, stirring uniformly; feeding oxidizer, stirring; aluminium layer and plastic layer being automatically peeled off after soaking for 1-20 minutes; washing the packing material with water twice or three times, removing the surface residual release agent; releasing the aluminum foil and plastic layer. The invention can separate the aluminum composite packing quickly and has a high aluminum coefficient of recovery, meanwhile provides a good working environment to the operator.

Description

technical field [0001] The invention relates to a separating agent for separating aluminum-plastic composite packaging materials and a separation and recovery method thereof. Background technique [0002] At present, aluminum-plastic composite packaging materials are widely used in the packaging of food, medicine, chemicals and daily necessities. However, due to the excellent bonding strength of aluminum-plastic composite packaging materials, it is difficult to completely separate the aluminum layer and the plastic layer during recycling, and the recycling rate is very low, resulting in white pollution. Therefore, how to completely separate the aluminum layer from the plastic layer has become a subject of continuous research. [0003] Among the existing separating agents, some use organic solvents (such as acetone, ether, carbon tetrachloride, carbon trichloride, benzene and chlorobenzene, etc.) to soak and separate the packaging materials. However, organic solvents are to...

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Problems solved by technology

So it's not a good way either

[0005] There is also the use of formic acid or acetic acid (with other ingredients) as a stripping agent, because formic acid or acetic acid has a strong pungent smell, which will cause greater damage to the human respiratory system; moreover, formic acid or acetic acid is an organic weak acid, and the acidity is relatively weak. , so the reaction time is long, the energy consumption is large, and the separation effect is poor

Moreover, the price of formic acid or acetic acid is also higher, and the separation cost is large.