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Qualitative identification method and application of diacetate fiber and triacetate fiber

A technology of triacetate fiber and diacetate fiber, which is applied in the field of textile fibers, can solve problems such as the difficulty of qualitative identification, and achieve the effect of simple and intuitive identification results

Pending Publication Date: 2022-07-22
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

This brings great difficulties to the qualitative identification work, so it is urgent to study an efficient, accurate, stable and environmentally friendly qualitative identification method for diacetate fiber and triacetate fiber to meet the needs of market players

Method used

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  • Qualitative identification method and application of diacetate fiber and triacetate fiber
  • Qualitative identification method and application of diacetate fiber and triacetate fiber
  • Qualitative identification method and application of diacetate fiber and triacetate fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] like figure 1 As shown, there are only slight differences in the molecular structures of diacetate fibers and triacetate fibers at room temperature, that is, acetic anhydride in triacetate fibers is hydrolyzed into hydroxyl groups to form diacetate fibers, and they are heated to 500 After ℃, different spectral information can be obtained by observing in the mid-infrared band. see figure 2 Shown are mid-infrared absorption spectra of a reference sample of diacetate fibers at 50°C intervals. This example provides a method for obtaining mid-infrared spectra of molecular thermal motion and thermal decomposition of a reference sample of diacetate fiber.

[0058] Specifically, 1 g of the known reference diacetate fiber was cut into fiber samples with an average length of 0.01 mm using a Hastelloy slicer; 0.1 mg of the diacetate fiber sample was mixed with 20 mg of potassium bromide powder and placed On the tablet press, the tablet press presses the above-mentioned diaceta...

Embodiment 2

[0061] see image 3 Shown are mid-infrared absorption spectra of a reference sample of triacetate fibers at 50°C intervals. This example provides a method for obtaining the mid-infrared spectrum of the molecular thermal motion and thermal decomposition of the triacetate fiber reference sample.

[0062] Specifically, 1 g of the known reference triacetate fiber was cut into fiber samples with a length of 0.01 mm using a Hastelloy microtome; 0.1 mg of the triacetate fiber sample was mixed with 20 mg of potassium bromide powder and placed in a On the tablet press, the tablet press was pressed into a transparent sheet at a pressure of 6 MPa, placed in a ceramic heating ring and placed at the window of a Nicolet 380 Fourier transform infrared spectrometer. The temperature is raised to 500°C, and the infrared spectrum of the thermal motion and thermal decomposition of the triacetate fiber molecule at each temperature point of 50°C is recorded to obtain image 3 The graph of the ref...

Embodiment 3

[0068] It is known that the fiber to be identified is one of diacetate fiber or triacetate fiber, and it is qualitatively identified. The specific method is as follows:

[0069] 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;

[0070] 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 8 MPa;

[0071] The transparent sheet is placed in the window of a Nicolet 380 Fourier transform infrared spectrometer (can be heated);

[0072] Set the heating rate of the Nicolet 380 Fourier transform infrared spectrometer to 15°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;

[0073] The infrared spectrograms o...

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Abstract

The invention discloses a qualitative identification method for diacetate fibers and triacetate fibers and application of the qualitative identification method. The technical blank that the diacetate fibers and the triacetate fibers cannot be effectively identified in the prior art is filled. Comprising the following steps: sample preparation: cutting a fiber to be identified into a fiber sample; 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; and determining whether the to-be-identified fiber is the diacetate fiber or the triacetate fiber according to a comparison analysis result at the position with the wave number of 1564cm <-1 > and the position with the wave number of 1373cm <-1 >.

Description

technical field [0001] The invention relates to the technical field of textile fibers, in particular to a qualitative identification method and application of diacetate fibers and triacetate fibers. Background technique [0002] Cellulose acetate fibre (cellulose acetate fibre) is the reaction of hydroxyl groups in the macromolecular chain of cellulose with acetic anhydride to generate cellulose acetate, which is spun to form cellulose acetate fibre, referred to as acetate fibre. Acetate fiber is a large variety of man-made fibers. Compared to other textile fibers, acetate fibers have some properties. This fiber has a good luster and is softer than viscose and other textile fibers. Acetate fiber has good feel (soft, smooth, dry, crisp, elastic), comfort (breathing, sweat absorption, fast drying, no static adhesion), high elongation at break, and its elastic recovery is significantly better than viscose fiber Strong, and low swelling in water. Acetate products are easy to...

Claims

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Application Information

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IPC IPC(8): G01N21/3563
CPCG01N21/3563G01N2021/3572G01N2021/3595G01N2001/2873
Inventor 吕品邓立生马昌萍刘龙辉胡美桂兰玮琳黄志耀
Owner 福建省纤维检验中心
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