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A screening method for plastic flotation foaming agent

A screening method and technology for foaming agents, which are used in flotation, plastic recycling, analysis of materials, etc., can solve the problem of lack of selectivity and pertinence of plastics to be flotated, inability to establish a database for screening foaming agents, unfavorable resource sharing and long-term development. Development and other issues, to achieve the effect of high screening efficiency and accuracy, small screening workload, and convenient realization

Active Publication Date: 2018-12-11
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The screening of foaming agents is only carried out from the perspective of molecular structure, the screening effect is poor, and there is a lack of selectivity and pertinence for different plastics to be flotation;
[0004] (2) There are still many types of foaming agents screened from the perspective of molecular structure, and their effectiveness needs to be verified through flotation experiments. The actual workload is large, and material and human resources are wasted;
[0005] (3) At present, there is still no quantifiable screening index, and it is impossible to establish a database for screening foaming agents, which is not conducive to resource sharing and long-term development of relevant information in the plastic flotation process

Method used

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  • A screening method for plastic flotation foaming agent
  • A screening method for plastic flotation foaming agent
  • A screening method for plastic flotation foaming agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In the present embodiment, the plastic to be flotation is polypropylene, and the best foaming agent is selected from terpineol oil, methyl isobutyl carbinol, polyethylene glycol and tea saponin foaming agent, specifically comprising the following steps:

[0033] Step 1, determine the screening index of foaming agent: determine the screening index of foaming agent, the screening index of foaming agent comprises the linear small molecule structure of foaming agent, foaming agent I FOA value and the foam dissipation time of the blowing agent;

[0034] In the present embodiment, determine three indexes of blowing agent to comprise the linear small molecular structure of blowing agent, blowing agent I FOA value and blowing agent for t DIS Reasonable screening of the third index, high screening efficiency and accuracy, greatly narrows the search range of foaming agents, obtains the best foaming agent suitable for plastics to be flotation, avoids unnecessary flotation experim...

Embodiment 2

[0057] In this embodiment, the plastic to be flotation is polystyrene butadiene copolymer, and the best foaming agent is selected from terpineol oil, methyl isobutyl carbinol, polyethylene glycol and tea saponin foaming agent agent, specifically including the following steps:

[0058] Step 1, determine the screening index of the foaming agent: according to the plastic components to be flotation, determine the screening index of the foaming agent, wherein, the screening index of the foaming agent includes the linear small molecular structure of the foaming agent, the foaming agent I FOA value and blowing agent for t DIS value;

[0059] Step 2, judging whether the foaming agent belongs to the straight-chain small molecule configuration: judging whether terpineol oil, methyl isobutyl carbinol, polyethylene glycol and tea saponin belong to the straight-chain small molecule configuration, terpineol oil, methyl Isobutyl carbinol and Polyethylene Glycol belong to straight-chain small...

Embodiment 3

[0086] In this example, the difference from Example 1 is that the plastic to be flotation is an acrylonitrile-butadiene-styrene copolymer. The concentration of foaming agent solution in step 301 is 8mg / L, and the surface tension of foaming agent solution (concentration is 8mg / L) is as shown in table 10, and in step 302, deionized water and plastic acrylonitrile-butylene to be flotation Table 11 shows the contact angles of ethylene-styrene copolymers, foaming agent solutions and plastics acrylonitrile-butadiene-styrene copolymers to be flotation. Foaming agent I to be selected when the plastic to be flotation is acrylonitrile-butadiene-styrene copolymer FOA The values ​​are shown in Table 12.

[0087] The surface tension of table 10 foaming agent solution (concentration is 8mg / L)

[0088] Foaming agent to be selected

terpineol oil

methyl isobutyl carbinol

polyethylene glycol

σ FOA

71.62

55.92

51.83

[0089] Table 11 Contact angle of ...

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Abstract

The invention discloses a method for screening foaming agents in plastic flotation, comprising: step 1, determining the screening index of the foaming agent; step 2, judging whether the foaming agent belongs to the straight-chain small molecule configuration; step 3, judging The IFOA value of the foaming agent; step 4, judge the foam dissipating time of the foaming agent. The invention has simple steps, low input cost, good use effect, high screening efficiency and accuracy, greatly narrows the search range of foaming agent, obtains the best foaming agent suitable for plastics to be flotation, and avoids unnecessary flotation The selected experimental verification saves material and human resources. At the same time, the screening index value can be quantified, which is convenient for the establishment of the foaming agent screening database in the later stage, and is conducive to the resource sharing of relevant information in the plastic flotation process, and has strong practicability.

Description

technical field [0001] The invention belongs to the technical field of solid waste pollution prevention and resource utilization, and in particular relates to a screening method for plastic flotation foaming agents. Background technique [0002] In recent years, my country's plastic industry has continued to develop rapidly, and behind the huge production and consumption has brought a large amount of plastic waste. If plastic waste is not handled properly, it will not only increase environmental pollution, but also reduce the recycling of plastic waste. efficiency. At present, the root cause of the low recycling rate of waste plastics is not the backwardness of the methods in the final recycling stage, but the reduction in the quality of recycled plastics and pyrolysis fuel caused by the loose sorting in the middle stage. Flotation, as a technical means to realize the separation by using the difference in floatability of fine particle materials, will hopefully make up for th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/02B03D1/02G01N13/02B03D101/04
CPCB03D1/02B03D2201/04B29B17/02B29B2017/0248G01N13/02G01N2013/0208Y02W30/62
Inventor 李彦鹏刘珺文豪沈洲谢铮胜路瑞李婉欣任香萤赵钺
Owner CHANGAN UNIV
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