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Methodfor recycling and biologically utilizing polypropylene flame-retardant plastic

A technology for flame-retardant plastics and polypropylene, which is applied in the field of recycling and bio-utilization of polypropylene flame-retardant plastics, can solve the problems of reducing the quality of recycled plastics, environmental pollution, and recycling defects of PP plastics, and achieves high resource recycling rate and cost. low cost effect

Active Publication Date: 2021-08-06
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned recycling methods have relatively large defects for the recycling of some PP plastics.
For PP flame-retardant plastics with large molecular weight, due to their high melting point, it is inevitable that part of the flame retardant will be decomposed during the remelting and recycling process, and the decomposition of the flame retardant will discharge substances such as nitrogen and phosphorus, which will reduce the quality of recycled plastics. At the same time, it will also cause some pollution to the environment

Method used

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  • Methodfor recycling and biologically utilizing polypropylene flame-retardant plastic
  • Methodfor recycling and biologically utilizing polypropylene flame-retardant plastic
  • Methodfor recycling and biologically utilizing polypropylene flame-retardant plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1, a kind of recovery and bioutilization method of polypropylene flame-retardant plastic

[0046] The PP flame-retardant plastic (the average molecular weight is about 100,000 to 150,000, and the ammonium polyphosphate (APP) flame retardant addition amount is 2% of the polypropylene mass) is crushed by a pulverizer to make a granular product with a particle size of 100 μm. powder. The above-mentioned powder is soaked in an aqueous solution containing microorganisms of Paleobacterium chickpea, Brucella, and Sword bacteria (the ratio of the number of effective viable bacteria is 45:45:10) to carry out biodegradation treatment. The temperature of the biodegradation treatment is 40° C., and the time of the degradation treatment is 96 hours. Wash the treated plastic powder with pure water, dry it in an oven at 130°C, and melt and granulate it according to the melting point characteristics of PP particles to obtain recycled PP plastic masterbatch; the degradation ...

Embodiment 2

[0049] Embodiment 2, Decomposition and recycling of PP flame-retardant composite plastics

[0050]The PP flame-retardant plastic (the average molecular weight is about 100,000 to 150,000, and the ammonium polyphosphate (APP) flame retardant addition amount is 2% of the polypropylene mass) is crushed by a pulverizer to make a granular product with a particle size of 100 μm. powder. The above-mentioned powder is soaked in an aqueous solution containing microorganisms of Paleobacterium chickpea, Brucella, and Sword bacteria (the ratio of the number of effective viable bacteria is 45:45:10) to carry out biodegradation treatment. The temperature of the biodegradation treatment is 40° C., and the time of the degradation treatment is 48 hours. Wash the treated plastic powder with pure water, dry it in an oven at 130°C, and melt and granulate it according to the melting point characteristics of PP particles to obtain recycled PP plastic masterbatch; the degradation filtrate is subjec...

Embodiment 3

[0052] Embodiment 3, Decomposition and recycling of PP flame-retardant composite plastics

[0053] The PP flame-retardant plastic (the average molecular weight is about 100,000 to 150,000, and the ammonium polyphosphate (APP) flame retardant addition amount is 2% of the polypropylene mass) is crushed by a pulverizer to make a granular product with a particle size of 100 μm. powder. The above-mentioned powder is soaked in an aqueous solution containing microorganisms of Paleobacterium chickpea, Brucella, and Sword bacteria (the ratio of the number of effective viable bacteria is 45:45:10) to carry out biodegradation treatment. The temperature of the biodegradation treatment is 40° C., and the time of the degradation treatment is 24 hours. Wash the treated plastic powder with pure water, dry it in an oven at 130°C, and melt and granulate it according to the melting point characteristics of PP particles to obtain recycled PP plastic masterbatch; the degradation filtrate is subje...

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Abstract

The invention discloses a method for recycling and biologically utilizing polypropylene flame-retardant plastic. The method comprises the following steps: crushing PP flame-retardant plastic by using a crusher to prepare granular powder, wherein a flame retardant in the PP flame-retardant plastic is an ammonium polyphosphate flame retardant; then soaking in an aqueous solution containing compound bacteria microorganisms, and carrying out biodegradation treatment; cleaning, drying, and carrying out melting granulation according to the melting point characteristics of the PP particles; and further concentrating the degraded filtrate to be used as an inorganic fertilizer. According to the method disclosed by the invention, the ammonium polyphosphate flame retardant in the crushed high-molecular-weight or low-molecular-weight plastic particles is treated through a biodegradation method by utilizing the synergistic effect of the compound bacteria.

Description

technical field [0001] The invention belongs to the field of biotechnology, and relates to a recovery and biological utilization method of polypropylene flame-retardant plastics. Background technique [0002] Polypropylene (PP) plastic is a thermoplastic engineering plastic with high performance, low price and wide application. It has the advantages of good insulation, good heat resistance, low density, etc., and has a wide range of uses in electronics, machinery, auto parts and other industries due to its excellent mechanical properties and processing properties. In addition, the thermoplastic characteristics of polypropylene also make its composite materials have good recycling value, which is of great significance for the recycling of resources and the reduction of white pollution. Therefore, in recent years, PP composite materials have also become the key development in the field of engineering plastics. direction. [0003] With the increasingly stringent national requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/10C08L23/12
CPCC08J11/10C08J2323/12Y02W30/62
Inventor 裘洁琼戴玲珑王德永胡凡
Owner ZHEJIANG SCI-TECH UNIV
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