A method for efficient biodegradation of crystalline plastics

A biodegradable and crystalline technology, applied in the field of bioengineering technology and environmental engineering, can solve the problems of low biodegradation efficiency of crystalline plastics, and achieve the effect of increasing the probability, efficient biodegradation and reducing crystallinity

Active Publication Date: 2019-07-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the low biodegradation efficiency of existing crystalline plastics, the purpose of the present invention is to provide a method for efficient biodegradation of crystalline plastics

Method used

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  • A method for efficient biodegradation of crystalline plastics
  • A method for efficient biodegradation of crystalline plastics
  • A method for efficient biodegradation of crystalline plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for highly efficient biodegradation of crystalline plastics, comprising the steps of:

[0053] Described crystalline plastic is polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and its processing steps are as follows:

[0054] 1) Preparation of plastic raw materials: Clean polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), etc., cut them to a length less than 5 cm, and dry them for later use. Measure the melting temperature (T) of the crystalline plastic itself m ), glass transition temperature (T g ) and crystallinity: the melting temperature of polyethylene terephthalate (PET) (T m ) is 270°C, the glass transition temperature (T g ) was 69° C. and the degree of crystallinity was 30%. Melting temperature of polybutylene terephthalate (PBT) (T m ) is 224°C, the glass transition temperature (T g ) was 52°C and the degree of crystallinity was 32%.

[0055] 2) Melting treatment: heating and melting the above-mentioned ...

Embodiment 2

[0074] A method for highly efficient biodegradation of crystalline plastics, comprising the steps of:

[0075] The crystalline plastic is polycaprolactam / nylon-6 (PA-6), polyhexamethylene adipamide / nylon-66 (PA-66), polyhexamethylene sebacamide / nylon-610 (PA-610 );

[0076] 1) Preparation of plastic raw materials: polycaprolactam / nylon-6 (PA-6), polyhexamethylene adipamide / nylon-66 (PA-66), polyhexamethylene sebacamide / nylon-610 (PA- 610) cleaned, cut to a length less than 5cm, and dried for later use. Determination of the melting temperature of the crystalline plastic itself (T m ), glass transition temperature (T g ) and crystallinity: melting temperature of polycaprolactam / nylon-6 (PA-6) (T m ) is 220°C, the glass transition temperature (T g) was 55°C and the degree of crystallinity was 35%. The melting temperature of polyhexamethylene adipamide / nylon-66 (PA-66) (T m ) is 267°C, the glass transition temperature (T g ) was 57°C and the degree of crystallinity was 32%...

Embodiment 3

[0096] A method for highly efficient biodegradation of crystalline plastics, comprising the steps of:

[0097] The method for the biodegradation efficiency of the crystalline plastic poly-L-lactic acid (PLLA), its processing steps are as follows:

[0098] 1) Preparation of plastic raw materials: clean poly-L-lactic acid (PLLA), etc., cut to a length less than 5 cm, and dry for later use. Determination of the melting temperature of the crystalline plastic itself (T m ), glass transition temperature (T g ) and crystallinity: the melting temperature of poly-L-lactic acid (PLLA) (T m ) is 175°C, the glass transition temperature (T g ) was 55°C and the degree of crystallinity was 20%.

[0099] 2) Melting treatment: heating and melting the above-mentioned crystalline plastics, setting the melting working temperature parameter of poly-L-lactic acid (PLLA) to 200° C., and setting the melting working time of the above-mentioned plastics to 3 minutes.

[0100] 3) Quenching treatmen...

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Abstract

The invention relates to a method for efficiently biodegrading crystalline plastics. The method comprises the following steps: placing the crystalline plastics at a temperature more than or equal to the fusing temperature (Tm) thereof and performing fusing treatment; quickly transferring the treated plastics into a cold medium and performing quenching treatment; performing enzymolysis treatment on the quenched crystalline plastics. According to the invention, a physical method is adopted for performing fusion-quenching treatment on the crystalline plastics, the transformation of a condensed state structure of the crystalline plastics from a crystal form to an amorphous form is realized on the basis of no change of the chemical molecular structure, the crystallinity of the plastics is greatly reduced and the probability that enzyme accesses to and acts on the plastics is promoted, so that the biodegrading efficiency of the crystalline plastics is greatly increased.

Description

technical field [0001] The invention relates to a high-efficiency biodegradation method for crystalline plastics, belonging to the fields of bioengineering technology and environmental engineering technology. Background technique [0002] Between 2005 and 2015, the world's annual plastic production increased from 230 million tons to 320 million tons. Much of the vast amount of plastic waste generated by plastic consumption ends up in landfills or is discarded directly into the environment. Due to the stable material properties, plastic waste decomposes very slowly under natural conditions, and the accumulated plastic waste seriously pollutes the ecosystem. [0003] Using biological enzymes to degrade plastics into synthetic monomers or oligomers, and recycling monomers or oligomers as raw materials for plastic synthesis, has gradually been realized as a new way to solve plastic waste (PCT, Method for recyclingplastic products , WO 2014 / 079844A1). For example, polyethylene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/10C08L67/02C08L67/04C08L77/02C08L77/06
CPCC08J11/105C08J2367/02C08J2367/04C08J2377/02C08J2377/06Y02W30/62
Inventor 杨宇
Owner BEIHANG UNIV
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