Infrared spectrum detection method for cellulose acetate fiber content

Abstract

The invention discloses an infrared spectrum detection method of cellulose acetate fiber content, which comprises the following steps: placing a material with good light transmission and weak absorption in infrared spectrum in a drying box for drying treatment to obtain a dried material; cutting cellulose acetate fibers into powder by using a slicer, and mixing and grinding the powder and the product in the step S1 in an agate mortar to obtain a mixture; pouring the mixture into a film pressing machine, preparing a transparent sample wafer in a vacuum environment, and detecting the sample wafer under an infrared spectrum; collecting infrared spectrum data, recording the intensity of a characteristic peak, and analyzing the intensity to obtain the content of the cellulose acetate fiber; by comparing the wave crest and the wave trough at the two positions in the infrared transmission curve graph, whether the cellulose acetate fiber is contained or not is preliminarily judged, a calculation formula is fitted through the infrared transmission curve, the accurate cellulose acetate fiber content is directly calculated, and the detection accuracy is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to a method for detecting acetate fiber, and in particular to an infrared spectrum detection method for acetate fiber content. Background Art

[0002] Acetate, as an important textile material, is widely welcomed for its unique properties and elegant appearance. However, due to its specific chemical properties, acetate is prone to saponification during the finishing process. Although the saponified acetate has certain similarities with viscose in structure, its properties and uses are quite different. This brings an important problem to the textile industry: how to accurately determine the content of saponified acetate. Traditional fiber quantitative detection methods are mainly based on the physical and chemical properties of fibers. However, due to the similarities between saponified acetate and viscose in certain properties, these traditional methods often cannot accurately distinguish between the two. This leads to inaccurate fiber content reports, which affects fabric manufacturers' accurate evaluation and further development of product performance. For the textile and apparel industry, the fiber content of materials is a key factor in determining product performance, quality and value. Therefore, the inability to obtain accurate fiber content reports will undoubtedly hinder the development and innovation of the industry. To this end, the textile and apparel industry urgently needs a quantitative detection technology for saponified acetate to ensure product quality and performance and promote the sustainable development of the industry.

[0003] The degree of saponification of acetate fiber is determined by analyzing the absorption spectrum of the sample in the infrared light region using infrared transmission spectroscopy technology. The transmission spectrum of the sample is collected in the infrared light region, and the changes in the absorption peaks under different degrees of saponification are observed by comparing the spectra of the samples. The characteristics related to the degree of saponification are extracted by calculating the characteristic parameters such as the peak area, peak height or peak displacement of each absorption peak. Using the sample data with known saponification degree, a statistical analysis algorithm is used to establish a correlation model between the degree of saponification and the characteristic parameters. Using the established model, the infrared transmission spectrum data of unknown samples are predicted to determine their degree of saponification.

[0004] As fiber materials, the infrared spectrum of fiber samples is generally difficult to show fine fingerprint structures, but the overall characteristics are still obvious, which is one of the main bases for fiber identification. As molecular spectra, fibers with the same main chain structure generally have the same infrared absorption spectrum characteristics, such as natural cellulose fibers (cotton, linen, etc.), regenerated cellulose fibers (viscose, modal fibers, etc.), and natural animal fibers (wool, cashmere, silk, etc.). Fibers of the same material may show slight differences in the peak shape and peak position of their infrared spectra due to differences in sample sources, pretreatment, processing technology, post-finishing, instruments used, and sample preparation methods, but this does not affect the identification of their overall characteristics. In addition to showing the absorption characteristics of the original fiber, the infrared spectrum of the modified fiber will superimpose the absorption bands of these modified groups or substances as the content of the modified groups or substances increases. Summary of the invention

[0005] The invention overcomes the shortcomings of the prior art and provides an infrared spectrum detection method for acetate fiber content.

[0006] To achieve the above object, the technical solution adopted by the present invention is: an infrared spectrum detection method for acetate fiber content, comprising the following steps:

[0007] S1: placing a material with good light transmittance and weak absorption in the infrared spectrum in a drying box for drying to obtain a dried material;

[0008] S2: using a slicer to cut cellulose acetate into powder, and mixing and grinding it with the product in S1 in an agate mortar to obtain a mixture;

[0009] S3: pouring the mixture into a laminating machine, forming a transparent sample under a vacuum environment, and placing the sample under infrared spectroscopy for detection;

[0010] S4: Collect infrared spectrum data, record the intensity of characteristic peaks, and analyze the intensity to obtain the acetate content.

[0011] In a preferred embodiment of the present invention, in S1, the drying material is selected from potassium bromide, sodium chloride or ammonium bromide, and the drying parameters are a temperature of 100-120° C. and a time of 2-4 hours.

[0012] In a preferred embodiment of the present invention, in S2, the length of the acetate fiber powder is 18-22 μm.

[0013] In a preferred embodiment of the present invention, in S2, the mixing ratio of acetate fiber powder and drying material is 1:9-11, and the grinding time is 2-3 minutes.

[0014] In a preferred embodiment of the present invention, in S3, the pressure of the film pressing is 14-16 MPa, and the pressing time is 2-3 min.

[0015] In a preferred embodiment of the present invention, in S3, the detection environment is: temperature is 15-35°C, relative humidity is 10-70%, and the detection mode is selected as the transmission mode.

[0016] In a preferred embodiment of the present invention, in S4, the characteristic peak intensity is recorded, specifically the intensity and position data of the peaks and valleys at 1735-1765cm-1 and 1700-1636cm-1 of the infrared spectrum and the infrared data waveform.

[0017] In a preferred embodiment of the present invention, in S4, the intensity analysis specifically analyzes the characteristic peak direction of the infrared transmission curve at 1735-1765cm-1, and the characteristic peak intensity at 1657-1600cm-1 and the characteristic peak intensity at 1735-1765cm-1.

[0018] In a preferred embodiment of the present invention, in S4, the intensity is analyzed specifically by analyzing the peaks and valleys at 1687-1636 cm-1 of the transmission infrared spectrum, and the acetate fiber content is obtained based on the analytical calculation and curve fitting of the characteristic peak intensity position at 1657-1600 cm-1.

[0019] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0020] (1) The present invention provides an infrared spectrum detection method for acetate fiber content, which determines whether acetate fiber is contained by analyzing the characteristic peak direction at 1735-1765cm-1 of the infrared transmission curve, and the characteristic peak intensity at 1657-1600cm-1 and the characteristic peak intensity at 1735-1765cm-1, and obtains the acetate fiber content by analyzing and calculating the position of the characteristic peak intensity at 1657-1600cm-1 and curve fitting. Compared with the prior art, by comparing the peaks and troughs at two positions in the infrared transmission curve, it is preliminarily determined whether acetate fiber is contained, and a calculation formula is obtained by fitting the infrared transmission curve to directly calculate the precise acetate fiber content, which greatly improves the accuracy of detection.

[0021] (2) The present invention provides an infrared spectrum detection method for acetate fiber content, in which potassium bromide is mixed and ground with a material containing acetate fiber, so that during the detection process, potassium bromide is added and fully mixed with fiber powder, making the sample as a whole more uniform. Compared with the prior art, by improving the uniformity of sample detection, the scattering phenomenon of the light source when penetrating the sample, which in turn affects the collection and analysis of the spectral signal, is greatly avoided, thereby improving the stability of the instrument signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a comparison chart of the infrared characteristic peak differences between acetate / cotton blended fiber and pure cotton fiber;

[0024] Figure 2 This is a comparison chart of the infrared characteristic peaks of acetate / lyocell blended fiber and pure lyocell fiber;

[0025] Figure 3 This is a comparison chart of infrared characteristic peaks of acetate / cotton fibers with different blending ratios;

[0026] Figure 4 This is the infrared characteristic peak data diagram of acetate / lyocell fiber;

[0027] Figure 5 This is the infrared characteristic peak data diagram of acetate / cotton fiber;

[0028] Figure 6 This is the infrared characteristic peak data diagram of acetate / cotton fiber;

[0029] Figure 7 This is the infrared characteristic peak data diagram of acetate / polyester fiber;

[0030] Figure 8 This is the infrared characteristic peak data diagram of unsaponified acetate fiber and viscose fiber;

[0031] Fig. 9 This is the infrared characteristic peak data diagram of complete acetate fiber and cotton fiber;

[0032] Fig.10 This is the infrared characteristic peak data diagram of some acetate fibers and polyester fibers;

[0033] Fig.11 Flow chart of the detection of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0036] As shown in the figure, an infrared spectrum detection method for acetate fiber content includes the following steps:

[0037] S1: placing a material with good light transmittance and weak absorption in the infrared spectrum in a drying box for drying to obtain a dried material;

[0038] In a preferred embodiment of the present invention, in S1, the drying material is selected from potassium bromide, sodium chloride or ammonium bromide, and the drying parameters are a temperature of 100-120° C. and a time of 2-4 hours.

[0039] S2: using a slicer to cut cellulose acetate into powder, and mixing and grinding it with the product in S1 in an agate mortar to obtain a mixture;

[0040] In a preferred embodiment of the present invention, in S2, the length of the acetate fiber powder is 18-22 μm; the mixing ratio of the acetate fiber powder to the drying material is 1:9-11, and the grinding time is 2-3 min.

[0041] It should be noted that potassium bromide is dried in an oven, the fibers (or yarns and fibers after disassembly of their products) are arranged into bundles, and the fibers are cut into powders with a length of less than 20 μm using a slicer. Cutting the fibers into powders during the detection process helps the light source to penetrate and improves the accuracy of subsequent tests. 2 mg-3 mg of fiber powder is mixed with about 20 mg-30 mg of potassium bromide. The purpose of using potassium bromide is to reduce the error rate and improve the stability of the instrument signal, and a more accurate spectrum has been obtained. The mixture is put into an agate mortar and ground for 2 min-3 min;

[0042] S3: pouring the mixture into a laminating machine, forming a transparent sample under a vacuum environment, and placing the sample under infrared spectroscopy for detection;

[0043] In a preferred embodiment of the present invention, in S3, the pressure of the film pressing is 14-16 MPa, and the pressing time is 2-3 min; the detection environment is: temperature is 15-35° C., relative humidity is 10-70%, and the detection mode is selected as the transmission mode.

[0044] It should be noted that 1.5 mg of the evenly ground mixture is transferred to a compression molding machine and vacuum-pressed for 2 min at a pressure of about 15 MPa. The purpose of the present invention is to remove the air in the compressed tablet and reduce the interference caused by the subsequent detection of unnecessary peaks. A transparent sample can be obtained; the prepared sample is placed on the sample holder of the instrument, the scanning program is started, the transmission mode is selected, and the 4000 cm -1 -400cm -1 The infrared spectrum with a complete band range is baseline calibrated and smoothed, and then the characteristic peak intensity values ​​are recorded according to the labels in the appendix.

[0045] S4: Collect infrared spectrum data, record the intensity of characteristic peaks, and analyze the intensity to obtain the acetate content.

[0046] In a preferred embodiment of the present invention, in S4, the characteristic peak intensity is recorded, specifically the intensity and position data of the peaks and valleys at 1735-1765cm-1 and 1700-1636cm-1 of the infrared spectrum and the infrared data waveform.

[0047] In a preferred embodiment of the present invention, in S4, the intensity analysis specifically analyzes the characteristic peak direction of the infrared transmission curve at 1735-1765cm-1, and the characteristic peak intensity at 1657-1600cm-1 and the characteristic peak intensity at 1735-1765cm-1.

[0048] In a preferred embodiment of the present invention, in S4, the intensity is analyzed specifically by analyzing the peaks and valleys at 1687-1636 cm-1 of the transmission infrared spectrum, and the acetate fiber content is obtained based on the analytical calculation and curve fitting of the characteristic peak intensity position at 1657-1600 cm-1.

[0049] It should be noted that the sample spectral data was processed and analyzed, and the transmission infrared spectrum of each sample was collected at 1735-1765cm -1 1700-1636cm -1 The intensity and position data of the peaks and valleys at the infrared data waveform, according to the measured infrared transmission curve of the sample to be tested, there is an obvious characteristic peak with a downward valley at 1735-1765, which is a characteristic peak unique to acetate fiber, and other fibers do not have this characteristic peak. -1 There is an obvious downward characteristic peak at 1657-1600cm -1 The characteristic peak intensity is lower than 1735-1765cm -1The characteristic peak intensity at is used to qualitatively determine whether the sample to be tested contains cellulose acetate.

[0050] According to the measured infrared spectrum of the sample to be tested, 1687-1636cm -1 The peak and trough positions, intensities, and waveforms were collected and analyzed by homemade samples with known acetate content and samples with 1657-1600cm -1 The analysis and calculation of the characteristic peak intensity position and the curve fitting are used to obtain the calculation formula 1, and the content of acetate fiber in the sample to be tested is calculated according to the formula 1.

[0051] Y=6137.76795– 3.60434X (1)

[0052] Where X is the wave number position (cm-1) of the maximum characteristic peak at 1700-1636cm-1 in the infrared spectrum data of the sample, and Y is the percentage content of acetate fiber in the test sample (%). The percentage of acetate fiber content is calculated based on the infrared spectrum data and the formula

[0053] Embodiment 1:

[0054] Cut the acetic acid / cotton fabric with 50% acetic acid content into pieces, weigh 2 mg of the sample, mix it with 20 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tablet pressing mold, and use a hydraulic press to make the mixture into a tablet. Take out the tablet, and then use the tablet to perform infrared transmission spectrum test to obtain the infrared transmission curve as shown below Figure 1 As shown. The same method is used to test pure cotton fabric. Figure 1 As shown, the red curve is 50% acetate / cotton fabric, the blue curve is the curve of pure cotton fabric, and the red curve is at 1735-1765cm -1 There is an obvious downward trough at the bottom, which is the characteristic peak of acetate fiber in the infrared spectrum, which is significantly different from the blue curve (1735-1765cm -1 There is no obvious downward trough at the bottom of the peak, and the unique characteristic peak characteristics can be used to qualitatively determine that the sample contains acetate fiber.

[0055] Embodiment 2:

[0056] Cut the acetic acid / lyocell fabric with 10% acetic acid content into pieces, weigh 3 mg of the sample, mix it with 25 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tablet pressing mold, and use a hydraulic press to make the mixture into a tablet. Take out the tablet, and then use the tablet to perform infrared transmission spectrum test to obtain the infrared transmission curve as shown below Figure 2 Pure lyocell fabric was tested in the same way. Figure 2As shown. The red curve is 10% acetate / lyocell fabric, the blue is the infrared curve of pure lyocell fabric, and the red curve is at 1735-1765cm -1 There is a characteristic peak with an obvious downward trough at 1735-1765, which is the unique characteristic peak of acetate fiber in the infrared spectrum, which is significantly different from the blue curve (there is no obvious downward trough at 1735-1765). This unique characteristic peak feature can be used to qualitatively determine that the sample to be tested contains acetate fiber.

[0057] Embodiment 3:

[0058] Cut up acetic acid / cotton fabrics with acetic acid contents of 20%, 30% and 38.7%, weigh 2 mg of the sample, mix it with 20 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tablet pressing mold, and use a hydraulic press to make the mixture into a tablet. Take out the tablet, and then use the tablet to perform infrared transmission spectrum test to obtain the infrared transmission curve as shown in Figure 3 As shown in the image, it can be seen that the infrared curves of the three samples have obvious characteristic peaks with a downward trough at 1735-1765, which is a unique characteristic peak of acetate fiber in the infrared spectrum. Based on this unique characteristic peak feature, it can be qualitatively judged that the three samples contain acetate fiber.

[0059] Embodiment 4:

[0060] Homemade acetic acid / lyocell blended fabric, acetic acid content is about 60%. Cut the homemade acetic acid / lyocell blended sample fabric into pieces, weigh 2 mg of the sample, mix it with 30 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tablet pressing mold, and use a hydraulic press to make the mixture into a tablet. Take out the tablet, and then use the tablet to perform infrared transmission spectrum test to obtain the infrared transmission curve as shown Figure 4 As shown in the image, it can be seen that the infrared curve of the sample is between 1735-1765cm -1 There is a characteristic peak with an obvious trough downward, which can qualitatively determine that the samples contain acetate fiber. In addition, the curve of the sample is at 1700-1636cm -1 The wave number of the characteristic peak with the maximum value is 1685.741cm -1 , through the formula calculation, we can get Y = 62.91, so the acetate fiber content of the sample is determined to be 62.91%.

[0061] Embodiment 5:

[0062] Homemade acetic acid / cotton fiber blended fabric, acetic acid content is about 35%. Cut the homemade acetic acid / cotton blended sample fabric to be tested into pieces, weigh 2 mg of the sample, mix it with 30 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tablet pressing mold, and use a hydraulic press to make the mixture into a tablet. Take out the tablet, and then use the tablet to perform infrared transmission spectrum test to obtain the infrared transmission curve as shown Figure 5 As shown in the image, it can be seen that the infrared curve of the sample has a characteristic peak with an obvious downward trough at 1735-1765, which can qualitatively determine that the sample contains acetate fiber. In addition, the curve of the sample has a characteristic peak at 1700-1636cm -1 The wave number of the characteristic peak maximum is 1693.877cm -1 , through the formula calculation, we can get Y = 32.45, so the acetate content of the sample is determined to be 32.45%.

[0063] Embodiment 6:

[0064] Homemade acetic acid / cotton fiber blended fabric, acetic acid content is about 28%. Cut the homemade acetic acid / cotton blended sample fabric to be tested into pieces, weigh 2 mg of the sample, mix it with 30 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tablet pressing mold, and use a hydraulic press to make the mixture into a tablet. Take out the tablet, and then use the tablet to perform infrared transmission spectrum test to obtain the infrared transmission curve as shown Figure 6 As shown in the image, it can be seen that the infrared curve of the sample has a characteristic peak with an obvious downward trough at 1735-1765, which can qualitatively determine that the sample contains acetate fiber. In addition, the curve of the sample has a characteristic peak at 1700-1636cm -1 The wave number of the characteristic peak maximum is 1693.877cm -1 , through the formula calculation, we can get Y = 25.10, so the acetate content of the sample is determined to be 25.10%.

[0065] Embodiment 7:

[0066] Homemade acetate polyester blended fabric, acetic acid content is about 80%. Cut the homemade acetate / polyester fiber blended sample fabric to be tested into pieces, weigh 2 mg of the sample, mix it with 30 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tablet mold, and use a hydraulic press to make the mixture into a tablet. Take out the tablet, and then use the tablet to perform infrared transmission spectrum test to obtain the infrared transmission curve as shown Figure 7 As shown in the image, it can be seen that the infrared curve of the sample is between 1735-1765cm -1There is an obvious characteristic peak with a downward trough at 1700-1636 cm, which can be qualitatively judged that the samples contain acetate fiber. In addition, the curve of the sample has a characteristic peak at 1700-1636 cm, and the peak value is at 1678.551 cm -1 , through the formula calculation, we can get Y = 87.70, so the acetate fiber content of the sample is determined to be 87.70%.

[0067] Embodiment 8:

[0068] Cut 100% acetate fiber (unsaponified) into pieces, weigh 2 mg of the sample, mix it with 30 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tablet mold, and use a hydraulic press to make the mixture into tablets. Use the same preparation method to make 100% viscose fiber tablets for comparison. Take out the tablets, and then use the tablets to test the infrared transmission spectra of the two samples to obtain infrared transmission curves as shown below: Figure 8 As shown in the image, it can be seen that the infrared curve (red) of the acetic acid sample is between 1735-1765cm -1 There is an obvious characteristic peak with a downward trough at the position, while there is no such characteristic peak in the infrared curve of viscose fiber. It can be seen that the downward trough characteristic peak at this position is a characteristic peak unique to acetate fiber, which is not found in the infrared spectrum of viscose fiber. It can be qualitatively judged that the samples contain acetate fiber.

[0069] Embodiment 9:

[0070] Cut 100% acetate fiber (completely saponified) into pieces, weigh 2 mg of the sample, mix it with 30 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tablet mold, and use a hydraulic press to make the mixture into tablets. Use the same preparation method to make 100% cotton fiber tablets for comparison. Take out the tablets, and then use the tablets to perform infrared transmission spectrum tests on the two samples to obtain infrared transmission curves as shown below: Fig. 9 As shown in the image, it can be seen that the infrared curve (red) of the complete acetic acid sample is between 1735-1765cm -1 There is an obvious characteristic peak with a downward trough at the position, while there is no such characteristic peak in the infrared curve of cotton fiber. It can be seen that the downward trough characteristic peak at this position is a characteristic peak unique to acetate fiber, which is not present in the infrared spectrum of cotton fiber. It can be qualitatively judged that the samples contain acetate fiber.

[0071] Embodiment 10:

[0072] Cut 100% acetate fiber (partially saponified, saponification degree 26.58%) into pieces, weigh 2 mg of the sample, mix it with 30 mg of potassium bromide solid in an agate mortar, grind it in one direction for 2 minutes, take 2 mg of the mixed sample and put it into a tableting mold, and use a hydraulic press to make the mixture into tablets. Use the same preparation method to make 100% polyester fiber tablets for comparison. Take out the tablets, and then use the tablets to test the infrared transmission spectra of the two samples to obtain infrared transmission curves as shown below: Fig.10 As shown in the image, it can be seen that the infrared curve (red) of the complete acetic acid sample is between 1735-1765cm -1 There is an obvious characteristic peak with a downward trough at 1657-1600cm -1 The characteristic peak intensity is lower than 1735-1765cm -1 The characteristic peak intensity of the infrared curve of polyester fiber is at 1714cm -1 Acetate fiber is different, 1657-1600cm -1 The characteristic peak intensity is higher than 1714cm -1 The intensity of the characteristic peak at is significantly different from that of acetate fiber. It can be seen that the downward trough characteristic peak at this position is a unique characteristic peak of acetate fiber, which is not present in the infrared spectrum of polyester fiber. It can be qualitatively determined that the samples all contain acetate fiber.

[0073] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. An infrared spectrum detection method for acetate fiber content, characterized in that: The following steps are involved: S1: placing a material with good light transmittance and weak absorption in the infrared spectrum in a drying box for drying to obtain a dried material; S2: using a slicer to cut cellulose acetate into powder, and mixing and grinding it with the product in S1 in an agate mortar to obtain a mixture; S3: pouring the mixture into a laminating machine, forming a transparent sample under a vacuum environment, and placing the sample under infrared spectroscopy for detection; S4: Collect infrared spectrum data, record the intensity of characteristic peaks, and analyze the intensity to obtain the acetate content.

2. The infrared spectrum detection method for acetate fiber content according to claim 1, characterized in that: In S1, the drying material is selected from potassium bromide, sodium chloride or ammonium bromide, and the drying parameters are a temperature of 100-120° C. and a time of 2-4 hours.

3. The infrared spectrum detection method for acetate fiber content according to claim 1, characterized in that: In S2, the length of the cellulose acetate powder is 18-22 μm.

4. The infrared spectrum detection method for acetate fiber content according to claim 1, characterized in that: In S2, the mixing ratio of acetate fiber powder and drying material is 1:9-11, and the grinding time is 2-3 minutes.

5. The infrared spectrum detection method for acetate fiber content according to claim 1, characterized in that: In the step S3, the film pressing pressure is 14-16 MPa, and the pressing time is 2-3 min.

6. The infrared spectrum detection method for acetate fiber content according to claim 1, characterized in that: In S3, the detection environment is: temperature is 15-35° C., relative humidity is 10-70%, and the detection mode is the transmission mode.

7. The infrared spectrum detection method for acetate fiber content according to claim 1, characterized in that: In S4, the characteristic peak intensity is recorded as 1735-1765cm in the infrared spectrum. -1 1700-1636cm -1 The intensity and position data of the peaks and troughs and the infrared data waveform.

8. The infrared spectrum detection method for acetate fiber content according to claim 1, characterized in that: In S4, the intensity analysis is specifically to analyze the infrared transmission curve at 1735-1765cm -1 The characteristic peak direction at 1657-1600cm -1 The characteristic peak intensity at 1735-1765cm -1 The characteristic peak intensity at .

9. The infrared spectrum detection method for acetate fiber content according to claim 1, characterized in that: In S4, the intensity is analyzed specifically by analyzing the transmission infrared spectrum 1687-1636cm -1 The peaks and valleys are analyzed and the peaks and valleys are analyzed according to 1657-1600cm -1 The acetate fiber content was calculated by analytical calculation and curve fitting of the characteristic peak intensity position.

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