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Improve the purity of materials recycled from disposable absorbent articles

An absorbent product, disposable technology, applied in the direction of plastic recycling, recycling technology, application, etc., can solve the problems of material waste, low efficiency of recycling technology, difficulty in separating cellulose fibers, etc.

Active Publication Date: 2020-12-18
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Previous attempts have involved the use of hazardous chemicals and the waste of useful materials due to inefficient recycling techniques
Separation of cellulose fibers from the polymer layer is particularly difficult due to the use of binders

Method used

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  • Improve the purity of materials recycled from disposable absorbent articles

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Experimental program
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Embodiment Construction

[0014] The present disclosure relates to methods for increasing the purity and quantity of materials, including synthetic materials, recovered from recycled disposable absorbent articles.

[0015] More specifically, the present disclosure relates to methods for easily and economically separating materials in disposable absorbent articles, removing moisture absorbed by superabsorbent polymers (SAP), and recovering constituent materials such as polymers, cellulose fibers, and superabsorbent polymers. way of things.

[0016] The goal of the recycling method is to create a clean stream of recycled fibre, plastic and SAP. Residual fibers need to be removed from the plastic stream in order to consider it a "clean" recycled plastic stream.

[0017] In order to separate such superabsorbent polymer (in the gel state) and cellulose pulp into separate resources, the superabsorbent polymer must be transformed from the gel state into primary particles or other state.

[0018] Therefore,...

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Abstract

Improving recovery from recycling disposable absorbent articles comprising superabsorbent polymers comprising: separating said articles into a mixed polymer material / cellulose fiber stream and a superabsorbent polymer / fiber stream; and treating said mixed polymer material with an enzyme polymer material / cellulose fiber flow to release the cellulose fibers from the polymer material. The method may also include shredding the disposable absorbent article; repulping the shredded disposable absorbent article; and dehydrating the superabsorbent polymer, wherein dehydrating comprises swollen superabsorbent polymer ( SAP) is sprayed with water by immersing the SAP in a gel state into the composition for moisture removal, wherein seawater and 0.5 to 3% by weight of calcium chloride based on the weight of seawater are mixed for 10 minutes to 4 hours.

Description

Background technique [0001] The present disclosure relates to methods for increasing the purity and quantity of materials, including synthetic materials, recovered from recycled disposable absorbent articles. More specifically, the present disclosure relates to methods for easily and economically separating materials in disposable absorbent articles, removing moisture absorbed by superabsorbent polymers (SAP), and recovering constituent materials such as polymers, cellulose fibers, and superabsorbent polymers. way of things. [0002] The use of disposable absorbent articles, including diapers, continues to increase every year. Currently, all used disposable absorbent articles are incinerated or disposed of in landfills. However, incinerating or disposing of articles in landfills can lead to problems of lack of landfill sites, or high processing costs due to incineration, and adversely affect the environment due to the generation of carbon dioxide during the process. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/02B29B17/04
CPCB29L2031/4878B29B2017/0251B29B17/02Y02W30/62B29B17/04C08J11/08B09B3/80B29K2001/08C08J2300/14
Inventor 李镐善K·金H·金
Owner KIMBERLY-CLARK WORLDWIDE INC
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