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Method for identifying regenerated polyester generated through chemical recycling method

A technology for chemical recycling and regeneration of polyester, applied in scientific instruments, biological neural network models, measurement devices, etc., can solve problems such as incomplete removal of organic impurities, and achieve the effect of easy implementation and strong nonlinear mapping

Active Publication Date: 2016-03-09
SHANGHAI TEXTILE GRP DETECTION STANDARD CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of organic impurities in terephthalic acid. Although the content is very small, they have a great influence on the polymerization process, intrinsic viscosity, molecular weight distribution, rheological properties, appearance color and mechanical strength of polyester.
The refining method of terephthalic acid is mainly hydrogenation refining, in addition to DMT refining method, solvent crystallization method, etc., but these methods cannot completely remove all organic impurities

Method used

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  • Method for identifying regenerated polyester generated through chemical recycling method
  • Method for identifying regenerated polyester generated through chemical recycling method
  • Method for identifying regenerated polyester generated through chemical recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 10 virgin polyester fiber samples, provided by domestic virgin polyester fiber manufacturers, sample numbers are 1#~10#; 10 regenerated polyester fiber samples, provided by domestic and foreign chemical regenerated polyester fiber manufacturers, sample numbers are 11#~ 20#.

[0048] Step 1: Extract the alcoholysis product of trace organic impurities embedded in the macromolecular structure of polyester

[0049] The alcoholysis of organic impurities embedded in the polyester macromolecular structure is extracted by methanol alcoholysis. The specific steps are as follows: prepare a methanol solution with a zinc acetate concentration of 0.02mg / mL as the transesterification solution, and combine 1g polyester fiber and 30mL transesterification solution Put it in the reaction tube, seal it and put it in a heating device. After reacting at 215°C for 3 hours, take out the reaction tube, cool to room temperature and filter. After removing the precipitate, the filtrate contains the ex...

Embodiment 2

[0146] For the sample in Example 1, the steps of extracting the alcoholysis products of organic impurities embedded in the polyester macromolecular structure are: preparing a methanol solution with a zinc acetate concentration of 0.04 mg / mL as the transesterification solution, and mixing 1.5 g of polyester fiber and Place 50mL of transesterification solution in the reaction tube, seal it and put it in the heating device, react at 225℃ for 3.5 hours, take out the reaction tube, cool to room temperature and filter, the filtrate after removing the precipitate contains the extracted and embedded polyester The alcoholysis of organic impurities in the macromolecular structure. The preprocessing method for variable matrix data is: according to this, area normalization processing and first-order numerical differential matrix are used for the variable matrix. Perform principal component analysis on the first-order differential matrix, and merge the first and second principal component s...

Embodiment 3

[0155] For the sample in Example 1, the steps for extracting the alcoholysis products of organic impurities embedded in the polyester macromolecular structure are: preparing a methanol solution with a zinc acetate concentration of 0.02 mg / mL as the transesterification solution, and mixing 1 g of polyester fiber and 30 mL of The transesterification solution is placed in the reaction tube, sealed and put into the heating device, reacted at 215°C for 2.5 hours, then the reaction tube is taken out, cooled to room temperature and filtered, the filtrate after removing the precipitate contains the extracted and embedded polyester The alcoholysis of organic impurities in the molecular structure. The method of preprocessing the variable matrix data is: preprocessing the variable matrix with area normalization. Perform principal component analysis on the preprocessed matrix data, merge the first, second, and third principal component scores of the preprocessed matrix data into a new feat...

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Abstract

The content distribution difference of organic impurities entering a polyester macromolecular structure is an identification basis of protogenetic polyester and regenerated polyester generated through a chemical recycling method. A method for identifying the regenerated polyester generated through the chemical recycling method comprises the steps of depolymerizing the regenerated polyester generated through the chemical recycling method and the protogenetic polyester by adopting a methanolysis method, and extracting alcoholysate of trace organic impurities embedded into the polyester macromolecular structure; obtaining detection signal data by adopting HPLC (High Performance Liquid Chromatography), and selecting detection signal data of a para orientation object of methyl benzoate; merging the detection signal data into a variable matrix, carrying out data preprocessing, then carrying out dimension reduction processing by adopting a PCA (Principle Component Analysis), extracting 2 to 6 principle components as characteristic variables, building a BP (Back-Propagation) artificial neural network to carry out a training and simulation verification by taking the obtained characteristic variables as input variables and protogenetic attributes and regenerated attributes of fiber as target variables, and identifying a to-be-identified sample to be the regenerated polyester generated through the chemical recycling method when a predicted value of the to-be-identified sample is matched with an attribute predicted value of the regenerated polyester generated through the chemical recycling method. The method disclosed by the invention has the advantages that the accurate rate is high, and convenience and quickness are realized.

Description

Technical field [0001] The invention relates to a method for identifying regenerated textile materials, in particular to a method for identifying regenerated polyester by a chemical recovery method by adopting a chemometric method. Background technique [0002] Polyester, the scientific name polyethylene terephthalate fiber, is a category of polyester fiber, and the English abbreviation is PET fiber. It is widely used in the textile field and is currently the world's largest fiber variety. Virgin polyester refers to polyethylene terephthalate produced by direct spinning or chip spinning after direct esterification continuous polycondensation or batch polycondensation to produce polyester with purified terephthalic acid and ethylene glycol as monomers Ester fiber. Recycled polyester can be divided into two categories according to the processing method: physical recovery method and chemical recovery method. Recycled polyester by physical recycling method refers to polyethylene t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/86G06N3/02
Inventor 申世红徐逸群刘慧杰端小平吴雅萍陆秀琴周祯德付昌飞李红杰夏坚琴
Owner SHANGHAI TEXTILE GRP DETECTION STANDARD CO LTD
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