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Qualitative identification method and application of meta-aramid fiber and para-aramid fiber

A para-aramid fiber and aramid fiber technology, which is applied in the field of textile fibers, can solve the problems of inaccurate identification results, unfriendly test waste water, no very efficient, stable and environmentally friendly qualitative identification methods, etc. Simple and intuitive results

Pending Publication Date: 2022-07-01
福建省纤维检验中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above analysis and identification methods will bring different problems in the qualitative identification of meta-aramid fibers and para-aramid fibers. For example, the dissolution method needs to use a solvent to dissolve the aramid fibers, which will inevitably produce environmental pollution after the identification operation. Unfriendly test wastewater; microscope method needs to use microscope to judge the change of aramid fiber shape, which requires high professional quality and experience of identification personnel; other methods also need a large number of repeated tests to obtain average results to determine the type of aramid fiber , and there are problems such as the identification result may be inaccurate
For meta-aramid fibers and para-aramid fibers, there is no good efficient, stable and environmentally friendly qualitative identification method

Method used

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  • Qualitative identification method and application of meta-aramid fiber and para-aramid fiber
  • Qualitative identification method and application of meta-aramid fiber and para-aramid fiber
  • Qualitative identification method and application of meta-aramid fiber and para-aramid fiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] like figure 1 As shown, there are only slight differences in the molecular structure diagrams of meta-aramid fibers and para-aramid fibers at room temperature, that is, the molecular chains of meta-aramid fibers are arranged in a zigzag shape, and the molecular chains of para-aramid fibers are arranged in a straight line. , and after heating them up to 500 °C respectively, and observing them in the mid-infrared band, different spectral information can be obtained. see figure 2 Shown are the mid-infrared absorption spectra of the meta-aramid fiber reference sample at 50°C temperature intervals. This embodiment provides a method for obtaining the mid-infrared spectrum of the molecular thermal motion and thermal decomposition of the meta-aramid fiber reference sample.

[0060] Specifically, 1 g of the known reference meta-aramid fiber was cut into fiber samples with an average length of 0.01 mm using a Hastelloy slicer; 0.1 mg of the meta-aramid fiber sample and 20 mg o...

Embodiment 2

[0063] see image 3 Shown are mid-infrared absorption spectra of para-aramid fiber reference samples at 50°C intervals. This example provides a method for obtaining the mid-infrared spectrograms of the molecular thermal motion and thermal decomposition of the para-aramid fiber reference sample.

[0064] Specifically, 1 g of the known reference para-aramid fiber was cut into fiber samples with a length of 0.01 mm using a Hastelloy slicer; 0.1 mg of the para-aramid fiber sample was mixed with 20 mg of potassium bromide powder Placed on a tablet press, the tablet press was pressed into a transparent sheet at a pressure of 7MPa, placed in a ceramic heating ring, and placed at the window of a Nicolet 380 Fourier transform infrared spectrometer. The room temperature was heated at 25°C, and the temperature was raised to 500°C. The thermal motion and thermal decomposition of the para-aramid fiber molecule at each temperature point of 50°C were recorded, and the infrared spectrum was ...

Embodiment 3

[0070] It is known that the fiber to be identified is one of meta-aramid fiber or para-aramid fiber, and qualitative identification of its species is carried out. The specific method is as follows:

[0071] Sample preparation: Use a Hastelloy slicer to cut 1 g of fibers to be identified into fiber samples with an average length of 0.1 mm;

[0072] Preparation of transparent flakes: 0.1 mg of the fiber sample and 20 mg of dry spectrally pure potassium bromide crystals are mixed uniformly and placed on a tablet machine to be pressed into transparent flakes with a pressure of 6 MPa;

[0073] The transparent sheet is placed in the window of a Nicolet 380 Fourier transform infrared spectrometer (can be heated);

[0074] Set the heating rate of the Nicolet 380 Fourier transform infrared spectrometer to 25°C / min, from room temperature to 500°C, and continuously record the molecular thermal motion and thermal decomposition infrared spectrum of the fiber sample at every 25°C;

[0075...

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Abstract

The invention discloses a qualitative identification method and application of meta-aramid fibers and para-aramid fibers. The qualitative identification method comprises the following steps: cutting fibers to be identified into fiber samples; uniformly mixing the fiber sample with a window sheet material, placing the mixture on a tablet press, and pressing the mixture into a transparent sheet; placing the transparent sheet in an infrared spectrum window capable of raising the temperature; heating the infrared spectrometer to 500 DEG C, and recording infrared spectrograms of thermal motion and thermal decomposition of molecules of the fiber sample at preset interval temperature points; comparing and analyzing the infrared spectrogram of the molecular thermal motion and thermal decomposition of the fiber sample at the preset interval temperature point with the infrared spectrogram of the molecular thermal motion and thermal decomposition of a reference sample; determining whether the to-be-identified fiber is meta-aramid fiber or para-aramid fiber according to an analysis result by comparing the absorption peak condition at the position with the wave number of 1205cm <-1 > and the absorption peak condition at the position with the wave number of about 818cm <-1 > in the process of raising the temperature to 500 DEG C.

Description

technical field [0001] The invention relates to the technical field of textile fibers, in particular to a qualitative identification method and application of meta-aramid fibers and para-aramid fibers. Background technique [0002] Aramid is the abbreviation of aromatic polyamide fiber, which has ultra-high strength, high modulus, light weight and long-lasting thermal stability, flame retardancy, super radiation resistance, chemical stability of acid and alkali resistance, and extremely It has excellent electrical insulation and anti-aging properties, and is a representative of new special fibers. Aramid is not only used in the textile industry, but also an important material in national defense, medical, environmental protection and cutting-edge science. It is one of the key materials developed in my country's strategic emerging industries. [0003] According to the relative position of the amide bond on the benzene ring, aramid fiber is divided into meta-aramid fiber (ara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563G01N21/03G01N1/28
CPCG01N21/3563G01N21/0303G01N1/286G01N2001/2873G01N2021/8444G01N21/84G01N2021/3572G01N2021/1731G01N2203/0226G01N2021/8472
Inventor 吕品潘行星林登光阮鸣梁李汉英林美芳田晓蕊
Owner 福建省纤维检验中心
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