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A separation method for mixed solid plastics

A separation method and technology for plastics, applied in the field of waste plastic recycling, can solve the problems of expensive instruments, low plastic recycling profits, and low separation efficiency, and achieve the effects of satisfying industrial applications, improving regeneration value, and recycling high purity.

Active Publication Date: 2019-11-15
佛山市南海承骏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional recycling process is mainly based on manual sorting. The manual sorting process is labor-intensive, the working environment is harsh, and the separation efficiency is low. It is no longer suitable for the needs of today's industry and future development.
[0003] Recently, there have been great technological breakthroughs in recycling processes such as near-infrared separation and electrostatic separation, but the recycling objects are only for materials with a density less than 1.080g / cm 3 Mixed plastics, greater than 1.080g / cm 3 Due to the addition of different proportions of flame retardants, reinforcing fibers, inorganic fillers, antistatic agents and other additives, the mixed plastics change the charge coefficient of the plastic itself, resulting in electrostatic separation failure, but the separation purity is less than 80%, resulting in of recycled plastic loses value
However, near-infrared separation technology can only sort light-colored mixed plastics, and dark-colored plastics cannot be sorted due to insufficient reflection light source, which causes the instrument to receive no feedback signal and cannot be sorted, and the instrument is very expensive, so it is not suitable for popularization and application.
The low profit of plastic recycling and the diversity of waste plastics also limit the development of plastic separation technology

Method used

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  • A separation method for mixed solid plastics
  • A separation method for mixed solid plastics
  • A separation method for mixed solid plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A method for separating mixed solid plastics, the purpose plastics being ABS resins, comprising the following steps:

[0064] 1) prepare solvent, solvent is made up of acetone, butanone and toluene; The mass ratio of acetone, butanone and toluene is 53:28:19;

[0065] 2) Soak the quartz sand particles with a diameter of 1 mm in solvent, and the volume ratio of the solvent to the quartz sand particles is 1:10;

[0066] 3) Stir and mix the quartz sand particles treated in step 2) with the mixed solid plastic at a volume ratio of 1:4, and pass through a sieve to remove excess quartz sand particles attached to the mixed solid plastic;

[0067] 4) The mixed solid plastics treated in step 3) are floated with sodium chloride solution, and the sinking target plastics are collected to complete the separation.

Embodiment 2

[0069] A method for separating mixed solid plastics, the purpose plastics being HIPS resin, comprising the following steps:

[0070] 1) prepare solvent, solvent is made up of acetone, toluene and hexanaphthene; The mass ratio of acetone, toluene and hexanaphthene is 11:63:26;

[0071] 2) Infiltrate the quartz sand particles with a diameter of 1mm into the solvent, and the volume ratio of the solvent to the quartz sand particles is 1:10;

[0072] 3) Stir and mix the quartz sand particles treated in step 2) with the mixed solid plastic at a volume ratio of 1:4, and pass through a sieve to remove excess quartz sand particles attached to the mixed solid plastic;

[0073] 4) The mixed solid plastics treated in step 3) are floated with sodium chloride solution, and the sinking target plastics are collected to complete the separation.

Embodiment 3

[0075] A method for separating mixed solid plastics, the target plastic is PC / ABS alloy, comprising the following steps:

[0076] 1) prepare solvent, solvent is made up of isobutyl acetate, ethyl acetate and cyclohexane by solvent; The mass ratio of isobutyl acetate, ethyl acetate and cyclohexane is 39:18:43;

[0077] 2) soak the glass particles with a diameter of 1mm in the solvent, and the volume ratio of the solvent to the glass particles is 1:10;

[0078] 3) Stir and mix the glass particles treated in step 2) with the mixed solid plastic at a volume ratio of 1:4, and pass through a screen to remove excess glass particles attached to the mixed solid plastic;

[0079] 4) The mixed solid plastics treated in step 3) are floated with a calcium chloride solution, and the sinking target plastics are collected to complete the separation.

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Abstract

The invention discloses a method for separating mixed solid plastic. The method includes the following steps that 1) a solvent which has the swelling effect with target plastic is prepared; 2) mineral substance particles are soaked with the solvent; 3) the mineral substance particles treated in the step 2) and the mixed solid plastic are stirred and mixed, and then redundant mineral substance particles are removed; 4) the mixed solid plastic treated in the step 3) is subjected to flotation with a flotation solution, submerged target plastic is collected, and separating is completed. According to the method, the mineral substance particles are attached to the target plastic in the mixed solid plastic, and the target plastic is submerged in the flotation solution to achieve the separating effect.

Description

technical field [0001] The invention relates to a method for separating mixed solid plastics, which belongs to the technical field of recycling waste plastics. Background technique [0002] The rapid development of the plastics industry, the large consumption of plastics and the short life cycle of plastics have led to a sharp increase in the amount of plastic waste. In the past, waste plastics were treated by incineration and landfill, which caused serious environmental pollution and waste of resources. Therefore, the recycling of waste plastics has been highly valued. For the recycling process of waste plastics, it is necessary to separate different plastics. At present, the separation of plastics is the bottleneck link restricting the recycling process of waste plastics. The traditional recycling process is mainly based on manual sorting. The manual sorting process is labor-intensive, the working environment is harsh, and the separation efficiency is low. It is no longe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/08C08L55/02C08L51/04C08L69/00C08L77/00C08L23/12C08K3/36C08K3/40C08K3/08B29B17/02B03B1/04
CPCB03B1/04B29B17/02B29B2017/0244C08J11/08C08J2323/12C08J2325/06C08J2355/02C08J2369/00C08J2377/00C08K3/08C08K3/36C08K3/40C08L55/02C08L69/00C08L25/06C08L77/00C08L23/12Y02W30/62
Inventor 何礼俊陈楚芝何伟成
Owner 佛山市南海承骏科技有限公司
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