Method for recycling nylon/polyolefin composite membrane by utilizing ionic liquid

A technology for recycling nylon and ionic liquid, which is applied in the field of recycling nylon/polyolefin composite membrane by using ionic liquid, can solve problems such as nylon recycling that is not mentioned, and achieve the effects of reducing energy consumption, simple separation process, and reducing recycling cost.

Pending Publication Date: 2020-09-01
宁波坚锋新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above patents all use chemical methods to recycle ny

Method used

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  • Method for recycling nylon/polyolefin composite membrane by utilizing ionic liquid
  • Method for recycling nylon/polyolefin composite membrane by utilizing ionic liquid
  • Method for recycling nylon/polyolefin composite membrane by utilizing ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

[0041] The recovery method of this embodiment:

[0042] Take 10g of the crushed material of PA / PE composite membrane after crushing, cleaning and drying, and 1g of anhydrous CaCl 2 Add to 100g of ionic liquid 1-ethyl-3-methylimidazolium bromide, and heat to 180°C under the protection of nitrogen atmosphere and stir to dissolve for 1.5h. Let it stand for 2 hours. During the standing process, the temperature is lowered to 80°C and stored at a constant temperature. The floating PE on the upper layer is taken out, and the residual ionic liquid on the surface is removed by washing with deionized water three times to obtain a clean PE. Filter the solution to filter out CaCl 2 , Put it in an oven at 220°C for 1 hour to obtain reusable anhydrous CaCl 2 . The filtered solution is added to deionized water, PA precipitates out, filtered, and the filtered liquid is processed by vacuum distillation to separate the ionic liquid and water to obtain a reusable ionic liquid. Th...

Example Embodiment

[0043] Example 2

[0044] The difference between the recovery method of Example 2 and Example 1 is that: Example 2 is not stored at a constant temperature during the static process, and it is left to stand naturally for 2 hours. Others are the same as Example 1.

[0045] Since the melting point of 1-ethyl-3-methylimidazolium bromide ionic liquid is about 71°C, during the standing process, the ionic liquid is solidified due to no constant temperature storage, and PE, PA and ionic liquid cannot be separated.

Example Embodiment

[0046] Example 3

[0047] The recovery method of this embodiment:

[0048] Take 10g of the crushed material of PA / PE composite membrane after crushing, cleaning and drying, and 1g of anhydrous CaCl 2 It was added to 100g of ionic liquid 1-ethyl-3-methylimidazole trifluoromethanesulfonate, and heated to 170°C under the protection of a nitrogen atmosphere, stirred and dissolved for 2h. After standing for 3 hours, the upper layer of floating PE was taken out, and the residual ionic liquid on the surface was removed by washing with deionized water three times to obtain clean PE. Filter the solution to filter out CaCl 2 , Put it in an oven at 230°C for 1.5 hours to obtain reusable anhydrous CaCl 2 . The filtered solution is added to deionized water, PA precipitates out, filtered, and the filtered liquid is processed by vacuum distillation to separate the ionic liquid and water to obtain a reusable ionic liquid. Then, the filtered material was washed with deionized water three times to...

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PUM

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Abstract

The invention provides a method for recycling a nylon/polyolefin composite membrane by utilizing an ionic liquid. The method comprises the following steps: crushing, cleaning and drying the nylon/polyolefin composite membrane, putting the crushed, cleaned and dried nylon/polyolefin composite membrane and a drying agent into the ionic liquid, heating to dissolve the nylon/polyolefin composite membrane, standing, collecting a substance emerging from the upper layer of the solution, washing, and drying to obtain regenerated polyolefin; filtering the residual solution without the upper-layer substances to remove the drying agent to obtain an ionic liquid solution containing nylon, adding the solution into water to separate out nylon, filtering, washing and drying to obtain regenerated nylon; and carrying out vacuum distillation treatment on the residual solvent after filtering the nylon, and separating the ionic liquid from the water to obtain the reusable ionic liquid. According to the recycling method, nylon and polyolefin in the composite membrane can be completely separated and recycled respectively, and the drying agent and the ionic liquid used in the recycling method can be recycled, so that the recycling cost is greatly reduced, and the recycling method is green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of polymer material recovery and reuse, and relates to a method for recovering a nylon / polyolefin composite film by using an ionic liquid. Background technique [0002] Nylon / polyolefin composite film is a multi-layer structure film made of nylon (PA), ionic resin adhesive, polyolefin, etc., and blown by a co-extrusion machine using a special production process. The composite film combines the advantages of nylon and polyolefin, and has the advantages of high tensile strength, good moisture resistance, low oxygen permeability, oil resistance, high and low temperature resistance, non-toxic, odorless, easy heat sealing, and good air tightness. It is widely used in food packaging, medicine, express packaging cushioning air cushion and other fields. Nylon composite film is one of the important sources of recycled PA and recycled polyolefin. At present, nylon / polyolefin composite particles are directly recycled...

Claims

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Application Information

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IPC IPC(8): C08J11/08C08L23/06C08L77/00
CPCC08J11/08C08J2323/06C08J2477/00Y02W30/62
Inventor 麻一明徐禄波吴剑波王旭文正健孙剑
Owner 宁波坚锋新材料有限公司
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