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Method for evaluating molecular weight of polyester plasticizer

A technology of polyester plasticizer and evaluation method, which is applied in the direction of measuring devices, material separation, and analysis of materials, etc., can solve problems such as differences, and achieve the effects of low detection cost, high accuracy, and rapid detection

Inactive Publication Date: 2021-04-27
上海微谱检测科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the evaluation of the molecular weight of polyester plasticizers in the industry uses GPC testing, but the molecular weight obtained by GPC is the relative average molecular weight (relative to the reference, generally PS or polyester), because the reference and polyester The structure of the plasticizer is different, and there is a big difference between the measured result and the real value

Method used

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  • Method for evaluating molecular weight of polyester plasticizer
  • Method for evaluating molecular weight of polyester plasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Embodiment 1 provides a kind of evaluation method of polyester plasticizer molecular weight, comprises the following steps:

[0081] (1) dissolving polyester plasticizer in chloroform, concentration is 100ppm, obtains its GC-MS spectrogram, analyzes the end-capping monomer of polyester plasticizer;

[0082] (2) Obtain the infrared absorption spectrogram of the polyester plasticizer, the GC-MS spectrogram of the polyester plasticizer after pretreatment, and analyze the synthetic monomer of the polyester plasticizer;

[0083] Infrared absorption spectrum of polyester plasticizer

[0084] The infrared absorption spectrogram is measured by a Fourier transform infrared spectrometer;

[0085] Sample preparation: use potassium bromide as a dispersant to grind with the polyester plasticizer, then place it in a tablet mold and press it into a transparent sheet to obtain a polyester plasticizer sample sheet; put it into a sample holder, and then Carry out the collection of in...

Embodiment 2

[0096] Embodiment 2 provides a kind of evaluation method of polyester plasticizer molecular weight, comprises the following steps:

[0097] (1) dissolving the polyester plasticizer in chloroform, the concentration is 0.01ppm, obtaining its GC-MS spectrogram, and analyzing the end-capping monomer of the polyester plasticizer;

[0098] (2) Obtain the infrared absorption spectrogram of the polyester plasticizer, the GC-MS spectrogram of the polyester plasticizer after pretreatment, and analyze the synthetic monomer of the polyester plasticizer;

[0099] Infrared absorption spectrum of polyester plasticizer

[0100] The infrared absorption spectrogram is measured by a Fourier transform infrared spectrometer;

[0101] Sample preparation: use potassium bromide as a dispersant to grind with the polyester plasticizer, then place it in a tablet mold and press it into a transparent sheet to obtain a polyester plasticizer sample sheet; put it into a sample holder, and then Carry out ...

Embodiment 3

[0112] Embodiment 3 provides a kind of evaluation method of polyester plasticizer molecular weight, comprises the following steps:

[0113] (1) dissolving polyester plasticizer in chloroform, concentration is 500ppm, obtains its GC-MS spectrogram, analyzes the end-capping monomer of polyester plasticizer;

[0114] (2) Obtain the infrared absorption spectrogram of the polyester plasticizer, the GC-MS spectrogram of the polyester plasticizer after pretreatment, and analyze the synthetic monomer of the polyester plasticizer;

[0115] Infrared absorption spectrum of polyester plasticizer

[0116] The infrared absorption spectrogram is measured by a Fourier transform infrared spectrometer;

[0117] Sample preparation: use potassium bromide as a dispersant to grind with the polyester plasticizer, then place it in a tablet mold and press it into a transparent sheet to obtain a polyester plasticizer sample sheet; put it into a sample holder, and then Carry out infrared spectrum co...

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Abstract

The invention relates to the technical field of analysis and detection methods, in particular to a method for evaluating the molecular weight of a polyester plasticizer. The method for evaluating the molecular weight of the polyester plasticizer comprises the following steps of (1) acquiring a GC-MS spectrogram of the polyester plasticizer, and analyzing to obtain an end-capped monomer of the polyester plasticizer, (2) acquiring an infrared absorption spectrogram of the polyester plasticizer and a GC-MS spectrogram of the pretreated polyester plasticizer, and analyzing to obtain a synthetic monomer of the polyester plasticizer, (3) acquiring a nuclear magnetic spectrogram of the polyester plasticizer, and analyzing to obtain a ratio of a synthetic monomer to an end-capped monomer, and (4) calculating the molecular weight of the polyester plasticizer according to the molecular weights and ratios of the polyester plasticizer synthetic monomer and the end-capped monomer. According to the method, qualitative identification of the polyester plasticizer synthetic monomer is realized through simple pretreatment and characteristic signal amplification, and the molecular weight of the polyester plasticizer is calculated through nuclear magnetic calculation logic.

Description

technical field [0001] The invention relates to the technical field of analysis and detection methods, in particular to a method for evaluating the molecular weight of polyester plasticizers. Background technique [0002] For PVC soft products, oil leakage often occurs, resulting in product failure. In order to overcome this problem, foreign countries took the lead in synthesizing polyester plasticizers, which can effectively prevent plastic products from oiling, and have been recognized by the industry. Therefore, more and more companies are preparing to invest in the synthesis of polyester plasticizers. However, the molecular weight of synthetic raw materials and product polyesters has become a difficult point in the research and development process. There is an urgent need to develop a method for structural analysis of polyester plasticizers. [0003] At present, the evaluation of the molecular weight of polyester plasticizers in the industry uses GPC testing, but the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06
Inventor 吴杰耿遥杰张红梅贺芝刚
Owner 上海微谱检测科技集团股份有限公司
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