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Method of removing films on surfaces of waste ring-pull cans

A cans and paint film technology, applied in the field of recycling of waste materials, can solve the problems of partial waste, secondary pollution, affecting the aluminum recovery rate during the stripping process, and improve the recovery rate, reduce the bonding strength, and avoid secondary pollution. Effect

Inactive Publication Date: 2014-04-30
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is no systematic introduction to the technical information of the film removal treatment, that is to say, the prior art pays more attention to the film release treatment agent, and neglects the specific film removal treatment process.
However, if the method selected for the release treatment is unreasonable, it will affect the effect of the release treatment agent on the one hand; on the other hand, it will cause secondary pollution; on the other hand, it will affect the recovery rate of aluminum, etc. Wait

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A) To prepare paint remover, put 45% of dimethyl sulfoxide and 40% of N,N-dimethylformamide into a container with stirring device according to mass percentage (that is, according to mass percentage, the same below). Mix evenly, then add 15% concentrated sulfuric acid according to the mass percentage and then mix evenly to obtain the paint film remover;

[0019] B) Paint film removal, first introduce the paint film remover obtained in step A) into the paint removal container, and then pre-break aluminum cans with a size (ie specification) of 10×20㎜~60×100㎜ Fragments are introduced into the paint stripping container, and the pop cans are completely submerged by the paint film remover in the paint stripping container, that is to say, the pop can fragments are immersed in the paint stripping agent, and the shake frequency is 10 times per second. Heat the paint remover in the paint stripping container to 40°C for 30 minutes, then take out the can fragments from the paint str...

Embodiment 2

[0021] Only change the mass percent of dimethyl sulfoxide in step A) to 35%; Change the mass percent of N,N-dimethylformamide to 55%, change the mass percent of the vitriol oil to 10%; In step B), change the shaking frequency to 1 time / second, change the heating temperature of the paint remover to 90°C, change the heating time to 10min, change the scrubbing time to 7min, and change the drying temperature to 160°C , and all the other are the same as the description to embodiment 1.

Embodiment 3

[0023] Only change the mass percent of dimethylsulfoxide in step A) to 40%; change the mass percent of N,N-dimethylformamide to 55%, change the mass percent of the vitriol oil to 5%; In step B), change the shaking frequency to 5 times / second, change the heating temperature of the paint remover to 65°C, change the heating time to 20min, change the scrubbing time to 10min, and change the drying temperature to 120°C , and all the other are the same as the description to embodiment 1.

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Abstract

The invention relates to a method of removing films on surfaces of waste ring-pull cans, belonging to the technical field of waste material recycle. The method comprises the following steps: first, uniformly mixing 25-45% of dimethyl sulfoxide and 30-55% of N, N-dimethylformamide in a container, and then adding 5-15% of concentrated sulfuric acid to uniformly mix to obtain a film remover; introducing the film remover to a depainting container, then, introducing pre-crushed aluminous ring-pull can fragments into the depainting container, heating the film remover in the depainting container, and taking out the ring-pull can fragments from the depainting container to be cleaned and dried to obtain crushed ring-pull can fragments without films on the surfaces; and finally, collecting a film material dissolved in the film remover and a film material generated in cleaning in a filtering manner. An organic solvent is combined with an inorganic acid, so that the films on the surfaces quickly fall off and are fully removed, thereby avoiding the secondary pollution, representing the green production and increasing the recovery rate.

Description

technical field [0001] The invention belongs to the technical field of recycling of waste and old materials, and in particular relates to a method for removing the paint film on the surface of waste and old pop cans. Background technique [0002] Because aluminum cans have advantages such as light weight, long shelf life, strong anti-counterfeiting, easy to carry and good recyclability, which cannot be compared with other metal packaging containers, the consumption has been in a continuous growth trend over the years, for example, in recent years The demand for aluminum cans in my country has reached about 7 billion. [0003] As a high-grade aluminum alloy material, waste aluminum cans have good recycling value, which can not only embody the spirit of economical circular economy, but also protect bauxite as a strategic resource. In view of this, the use of aluminum It has become a consensus in the industry to produce high-quality waste cans with the original grade (the origi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/12C23G5/036
Inventor 孙德勤杨高文
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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