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Separating and recovering method of ABS/PS (Acrylonitrile Butadiene Styrene/Poly Styrene) waste plastic

A technology for separating and recycling waste plastics, which is applied in the direction of plastic recycling and recycling technologies, and can solve the problems of poor applicability, difficulty in effective separation of waste plastics, and difficulty in achieving high-efficiency separation.

Inactive Publication Date: 2013-06-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the similar physical properties of different types of plastics, these sorting technologies are not suitable for the separation of waste plastics, and it is difficult to achieve efficient separation
For example, floatation sorting, wind sorting, and hydrocyclone sorting are all based on the density difference of different plastics for separation. Since the plastics have similar densities, these methods have great limitations; Direct flotation separation of plastics is difficult to be effective

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add ABS / PS mixed plastic with a particle size of 4mm into xylene solvent, and the ratio of mixed plastic to solvent is 20g / ml. Stir mechanically for 280 min at a temperature of 90°C. Filter the solution with a 400-mesh screen, and dry the filtered residue to obtain ABS plastic; evaporate the filtrate at a temperature of 30°C, dry the precipitated solute to obtain PS plastic, and recycle the evaporated xylene solvent. The recovery rate of ABS was 92.7%, and that of PS was 90.8%.

Embodiment 2

[0015] Add ABS / PS mixed plastic with a particle size of 40mm into xylene solvent, and the ratio of mixed plastic to solvent is 8g / ml. Stir mechanically for 150 min at a temperature of 10°C. Filter the solution with a 100-mesh screen, and dry the filtered residue to obtain ABS plastic; evaporate the filtrate at a temperature of 60°C, dry the precipitated solute to obtain PS plastic, and recycle the evaporated xylene solvent. The recovery rate of ABS was 94.2%, and that of PS was 92.7%.

Embodiment 3

[0017] Add ABS / PS mixed plastic with a particle size of 25mm into xylene solvent, and the ratio of mixed plastic to solvent is 12g / ml. Stir mechanically for 200 min at a temperature of 30°C. Filter the solution with a 300-mesh screen, and dry the filtered residue to obtain ABS plastic; evaporate the filtrate at a temperature of 60°C, dry the precipitated solute to obtain PS plastic, and recycle the evaporated xylene solvent. The recovery rate of ABS was 93.8%, and that of PS was 93.6%.

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PUM

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Abstract

The invention discloses a separating and recovering method of ABS / PS (Acrylonitrile Butadiene Styrene / Poly Styrene) waste plastic. The method comprises the following steps of: crushing ABS / PS mixed plastic to 4-40mm; adding to a solvent, wherein the ratio of ABS / PS mixed plastic and solvent is 8-20g / ml, and the solvent is dimethylbenzene or carbon disulfide; stirring and dissolving for 150-280 minutes at 10-90 DEG C; filtering the liquid and drying the filter dregs filtered to obtain ABS plastic; evaporating the filtrate at 30-60 DEG C and drying separated solute to obtain PS plastic. ABS / PS waste plastic can be simply and efficiently separated and recovered by the method. The recovery rate of ABS reaches 92.7-95.4% and recovery rate of PS reaches 91.2-95.4%.

Description

technical field [0001] The invention relates to a method for separating and recycling ABS / PS waste plastics. Background technique [0002] Due to the mass production, consumption and short use cycle of plastics, the amount of plastic waste has increased dramatically. A large amount of plastic waste not only causes a huge waste of resources, but also brings great harm to the environment: polluting the soil and oceans, and producing a large amount of toxic substances through incineration. Under the new situation of increasingly prominent energy problems and increasingly severe environmental problems, the research on strengthening the recycling of waste plastics has attracted great attention from governments of various countries. The recycling of waste plastics includes three stages: collection, sorting, and recycling. At this stage, the bottleneck that restricts the recycling of waste plastics lies in the sorting of plastics. [0003] Acrylonitrile-butadiene-styrene (ABS) re...

Claims

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Application Information

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IPC IPC(8): C08J11/08C08L55/02C08L25/06
CPCY02W30/62
Inventor 王重庆王晖符剑刚覃丽芝
Owner CENT SOUTH UNIV
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