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PET/PVC separation method

A separation method and mixing technology, which are applied in solid separation, flotation, plastic recycling, etc., can solve the problems of less treatment agent, low separation efficiency, and large amount of medicine, simplify the separation process and cost, and improve the separation efficiency. Effect

Inactive Publication Date: 2008-10-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with this method, there are few optional treatment agents, large doses of chemicals, and the separation efficiency is not high.

Method used

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  • PET/PVC separation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The hydrophilic surface treatment agent used in this example: sodium hydroxide, and the hydrophobic surface treatment agent: dioctyl adipate.

[0023] First, add 0.3 kg of sodium hydroxide to 10 liters of water to prepare a sodium hydroxide aqueous solution, and then add 10 grams of dioctyl adipate into 10 liters of water, and stir at a high speed to disperse it evenly in the water.

[0024] Then add 2 kilograms of PET / PVC compound (PVC content is 20 grams) in sodium hydroxide aqueous solution, heat to 80 ℃, stir for 10 minutes. Filter the mixed material treated with sodium hydroxide through a mesh sieve, add it to the aqueous solution of dioctyl adipate, heat to 80°C, stir for 10 minutes, and then filter it through a mesh sieve. Finally, put the surface-treated PET / PVC mixture into a rinsing tank with a water depth of 0.2 meters, and wash it several times with a water flow of 0.1 MPa. The floating PVC enters the PVC collecting sieve with the water flow, and the PET at...

Embodiment 2

[0026] The hydrophilic surface treatment agent used in this example: sodium hydroxide, and the hydrophobic surface treatment agent: dioctyl phthalate.

[0027] First, add 0.8 kg of sodium hydroxide to 10 liters of water to prepare a sodium hydroxide aqueous solution, and then add 12 grams of dioctyl phthalate into 10 liters of water, and stir at high speed to disperse it evenly in the water.

[0028] Then add 2 kilograms of PET / PVC compound (PVC content is 20 grams) in sodium hydroxide aqueous solution, heat to 80 ℃, stir for 10 minutes. Filter the mixed material treated with sodium hydroxide through a mesh sieve, add it into the aqueous solution of dioctyl phthalate, heat to 80°C, stir for 10 minutes, and then filter it through a mesh sieve. Finally, put the surface-treated PET / PVC mixture into a rinsing tank with a water depth of 0.2 meters, and perform multiple rinsing with a 0.2MPa water flow. The floating PVC enters the PVC collecting sieve with the water flow, and the P...

Embodiment 3

[0030] The hydrophilic surface treatment reagent adopted in this example: sodium hydroxide, and the hydrophobic surface treatment agent: dibutyl phthalate.

[0031] First, add 0.3 kg of sodium hydroxide to 10 liters of water to prepare an aqueous solution of sodium hydroxide, and then add 13 grams of dibutyl phthalate into 10 liters of water, and stir at high speed to disperse it evenly in the water.

[0032] Then add 2 kilograms of PET / PVC compound (PVC content is 20 grams) in sodium hydroxide aqueous solution, heat to 80 ℃, stir for 10 minutes. Filter the mixed material treated with sodium hydroxide with a mesh screen, add it into the dibutyl phthalate aqueous solution, heat to 80°C, stir for 10 minutes, and then filter with a mesh screen. Finally, put the surface-treated PET / PVC mixture into the rinsing tank with a water depth of 0.3 meters, and perform multiple rinsing with 0.3 MPa water flow. The floating PVC enters the PVC collecting sieve with the water flow, and the P...

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Abstract

The invention provides a separating method for PET / PVC. The method comprises: a PET / PVC mixture is processed by a hydrophobic treatment agent for surface hydrophobic treatment; the processed PET / PVC mixture is put in water and the current washes the PET / PVC mixture on the surface of the liquid to separate the PET and the PVC by floatation; the hydrophobic treatment agent is the aqueous solution with 0.05 to 0.5 percent of plasticizers. Strong alkaline solution is used by the invention first for changing the hydrophilic property of the surface of the PET, while the surface of the PVC still shows a rather strong hydrophobic property; the plasticizer solution is further used for processing and enlarging the surface hydrophilic property difference of the PET and the PVC so as to increase the separation efficiency; the plasticizer in the solution is mainly adsorbed on the surface of the PVC; finally floatation by washing from above the water surface can provides stirring driving force and upward floating bubbles at the same time, which simplifies the separation technology and cost and increases the separation efficiency to a great extent.

Description

(1) Technical field [0001] The invention relates to a PET / PVC separation method. (2) Background technology [0002] Separation of polyethylene, polypropylene, polystyrene and other plastics with different densities from PET from recycled PET can be easily achieved by gravity. For PVC, which has almost the same relative density as PET, it is difficult to separate by gravity. The main problem to be solved in the separation of PET / PVC recycled materials is: to obtain high-purity PET plastics by economical separation process. [0003] At present, the separation of PET / PVC mainly includes manual separation, solvent selective dissolution separation, melting point separation and flotation, among which flotation is the most economical and efficient method. Generally, flotation separation of PET / PVC is based on the selective fixation of air bubbles to the particles or sheets to be separated. In the natural state, PET and PVC are both hydrophobic and can float. Therefore, it is nece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/06C08L67/02C08L27/06B03D1/00B03D1/008B03B1/04
CPCY02W30/62
Inventor 张诚王林
Owner ZHEJIANG UNIV OF TECH
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