Qualitative identification method for mask base material fibers

Abstract

The invention discloses a qualitative identification method for facial mask base material fibers, which comprises the following steps: step 1, performing preliminary judgment and classification on a facial mask base material by using an infrared spectroscopy; 2, further distinguishing the regenerated cellulose fibers which cannot be distinguished in the step 1 by using a microscope observation method; and 3, distinguishing the lyocell fibers and the copper ammonia fibers, and the bamboo charcoal viscose fibers and the black viscose fibers, which cannot be distinguished in the step 1 and the step 2, by using a chemical dissolution method. The qualitative identification method for the mask base material fibers is suitable for common mask materials in the market, is convenient and easy to operate, has relatively high accuracy and repeatability, and can accurately identify the materials of the mask main body fibers. The method fills the gap of identifying the material of the mask base material, can provide a powerful basis for the detection of products related to the mask base material, is particularly suitable for the detection and sampling verification of the material of the mask base material, and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of facial mask detection, and in particular to a qualitative identification method for facial mask base material fibers. Background Art

[0002] Facial mask is a convenient skin care product. As an important component of facial mask, there are many types of mask base materials. Different materials of mask base materials will have different effects on skin safety and efficacy. In order to better analyze the safety of mask base materials and improve the use effect of finished mask products, it is essential to identify the material of the mask.

[0003] At present, the inspection and supervision of the mask field focuses on the functionality and safety of mask essences. The identification method and standard revision of mask base materials are still lacking. There is no effective identification method at home and abroad to analyze the status of mask base materials. Inspection and testing institutions are unable to analyze and identify mask base materials, and regulatory authorities lack technical support for the supervision of mask products.

[0004] With the continuous development of the facial mask consumer market, various new facial masks are emerging one after another. However, due to the differences in manufacturers and processing techniques, the differences in molecular structure and chemical properties of facial mask substrates are gradually becoming smaller, and the facial mask substrates cannot be distinguished by sense organs. Traditional textile fiber identification methods are suitable for textile fibers with large differences in physical and chemical properties, but are not applicable to facial mask substrates with similar properties.

[0005] Therefore, it is necessary to establish a method for identifying facial mask base material fibers, so as to provide a strong basis for the detection and scientific supervision of facial mask base material products. Summary of the invention

[0006] The purpose of the present invention is to provide a qualitative identification method for facial mask substrate fibers in view of the deficiencies in the prior art, so as to meet the needs of facial mask product testing and provide technical support for the supervision of facial mask products.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A method for qualitatively identifying facial mask substrate fibers is provided, comprising the following steps:

[0009] Step 1: Use infrared spectroscopy to make a preliminary judgment and classification of the mask base material;

[0010] Step 2, using a microscope to further distinguish the regenerated cellulose fibers that cannot be distinguished in step 1;

[0011] Step three, using a chemical dissolution method, to distinguish between lyocell fiber and cupro fiber, and between bamboo charcoal viscose fiber and black viscose fiber that cannot be distinguished in steps one and two.

[0012] Furthermore, the step 1 includes the following specific methods:

[0013] S11, placing a single-layer fiber reference substance on a sample pool, directly measuring it with an infrared spectrometer ATR accessory, collecting an infrared spectrum of the reference substance, performing baseline correction, smoothing, and peak analysis on the spectrum, and establishing a fiber infrared spectrum library;

[0014] S12, placing a single-layer mask substrate sample on a sample pool, directly measuring it with an infrared spectrometer ATR accessory, collecting an infrared spectrum of the sample, performing baseline correction, smoothing, and peak analysis on the spectrum, and then searching in the fiber infrared spectrum library established in S11, and judging the material of the sample in combination with the characteristic absorption peaks of the compound.

[0015] Furthermore, in S11 and S12, the infrared spectrum detection conditions are: single-point attenuated total reflection (ATR) infrared spectroscopy, Fourier transform infrared spectrometer, diamond wafer, scanning range 4000~650cm -1 , resolution 4.00cm -1 The number of sample scans was 50 times, and the background collection method was to collect background before each sample collection.

[0016] Furthermore, pure cotton, silk, and polymer fibers have their own characteristic peaks that can be identified by infrared spectroscopy, while the infrared characteristic peaks of regenerated cellulose fibers are basically the same, so they can only be classified as regenerated cellulose fibers.

[0017] Furthermore, the regenerated cellulose fibers include one or more of viscose fibers, lyocell fibers, modal fibers, and cuprammonium fibers.

[0018] Furthermore, the step 2 includes the following specific methods:

[0019] S21, cut the single fiber reference into very small flocs, spread them evenly on a glass slide, drop a drop of transparent medium (ultrapure water), cover with a cover glass, place on the stage, observe its longitudinal morphology under a 20x electron microscope, record the longitudinal morphological characteristics of the reference, and summarize them into a table;

[0020] S22, cut the mask substrate sample into very small flocs, spread them evenly on a glass slide, add a drop of transparent medium (ultrapure water), cover with a coverslip, place on the stage, observe its longitudinal morphology under a 20x electron microscope, record the longitudinal morphological characteristics of the mask substrate sample, and compare with the fiber reference to determine the material of the sample.

[0021] Furthermore, the microscopic longitudinal morphology of viscose fiber and modal fiber is distinct and can be distinguished by microscopy, but the microscopic longitudinal morphology of lyocell fiber and cupro fiber, and bamboo charcoal viscose fiber and black viscose fiber is basically the same, and they cannot be distinguished by microscopy.

[0022] Furthermore, the step 2 includes the following specific methods:

[0023] S31, cut a small amount of single fiber reference substance and place it in a small beaker, add an appropriate amount of 35% hydrochloric acid solution or 60% sulfuric acid solution, immerse the sample in the solution, place it at room temperature for 5 minutes, and observe the dissolution of the reference substance; record the solubility of the reference substance in 35% hydrochloric acid and 60% sulfuric acid solutions, and summarize them into a table;

[0024] S32, cut a small amount of mask base material sample and place it in a small beaker, add appropriate amount of 35% hydrochloric acid solution or 60% sulfuric acid solution, immerse the sample in the solution, place it at room temperature for 5 minutes, observe the dissolution of the sample, and compare it with the fiber reference to determine the material of the sample.

[0025] Furthermore, black viscose and lyocell can be dissolved in two acid solutions; cuprammonium fiber cannot be dissolved in 35% hydrochloric acid; bamboo charcoal particles are neither soluble in 35% hydrochloric acid nor in 60% sulfuric acid, and a large number of dark black particles will appear in the solution. Lyocell and cuprammonium fibers, bamboo charcoal viscose and black viscose fibers can be identified by the hydrochloric acid / sulfuric acid dissolution method.

[0026] The present invention adopts the above technical solution, and has the following technical effects compared with the prior art:

[0027] The qualitative identification method of the mask substrate fiber of the present invention is applicable to the common mask materials on the market, is convenient and simple to operate, has high accuracy and repeatability, and can accurately identify the material of the mask main body fiber. This method fills the gap in the identification of mask substrate materials, can provide a strong basis for the detection of mask substrate related products, and is particularly suitable for mask substrate material detection and sampling verification, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The following are infrared spectra of common facial mask base materials: (a) is pure cotton; (b) is silk; (c) is polyester; (d) is lyocell fiber (Tencel fiber); (e) is cupro fiber; and (f) is viscose fiber.

[0029] Figure 2The microscopic longitudinal morphology of common facial mask base material fibers; among them, (a) is pure cotton; (b) is polyester; (c) is viscose fiber; (d) is modal fiber; (e) is lyocell fiber (Tencel fiber); (f) is cupro fiber; (g) is black viscose fiber; and (h) is bamboo charcoal viscose fiber. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to be limiting of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention may be combined with each other without conflict.

[0031] Example 1

[0032] The present invention provides a method for qualitatively identifying facial mask substrate fibers, comprising the following steps:

[0033] Step 1: Use infrared spectroscopy to make a preliminary judgment and classification of the mask substrate:

[0034] S11, place the single-layer fiber reference on the sample pool and directly measure it using the infrared spectrometer ATR accessory (the detection conditions of the infrared spectrum are: single-point attenuated total reflection (ATR) infrared spectroscopy, Fourier transform infrared spectrometer, diamond wafer, scanning range 4000~650cm -1 , resolution 4.00cm -1 , the number of sample scans is 50 times, and the background collection method is to collect the background before each sample collection), collect the infrared spectrum of the reference substance, perform baseline correction, smoothing, and peak analysis on the spectrum, and establish a fiber infrared spectrum library;

[0035] S12, place the single-layer mask substrate sample on the sample pool and directly measure it with the infrared spectrometer ATR accessory (the detection conditions of infrared spectrum are: single-point attenuated total reflection (ATR) infrared spectroscopy, Fourier transform infrared spectrometer, diamond wafer, scanning range 4000~650cm -1 , resolution 4.00cm -1 , the sample scanning times is 50 times, and the background collection method is to collect the background before each sample collection), collect the infrared spectrum of the sample, perform baseline correction, smoothing, and peak analysis on the spectrum, and then search in the fiber infrared spectrum library established in S11, and judge the material of the sample in combination with the characteristic absorption peak of the compound.

[0036] The results show that Figure 1 ), pure cotton, silk, and polymer fibers have their own characteristic peaks, which can be identified by infrared spectroscopy, while the infrared characteristic peaks of regenerated cellulose fibers are basically the same, so they can only be classified as regenerated cellulose fibers (viscose fiber, lyocell fiber, modal fiber, cupro fiber).

[0037] Step 2: Use microscope observation to further distinguish the regenerated cellulose fibers that cannot be distinguished in step 1:

[0038] S21, cut the single fiber reference into very small flocs, spread them evenly on a glass slide, drop a drop of transparent medium (ultrapure water), cover with a cover glass, place on the stage, observe its longitudinal morphology under a 20x electron microscope, record the longitudinal morphological characteristics of the reference, and summarize them into a table;

[0039] S22, cut the mask substrate sample into very small flocs, spread them evenly on a glass slide, add a drop of transparent medium (ultrapure water), cover with a coverslip, place on the stage, observe its longitudinal morphology under a 20x electron microscope, record the longitudinal morphological characteristics of the mask substrate sample, and compare with the fiber reference to determine the material of the sample.

[0040] The results show that Figure 2 ), viscose fiber and modal fiber have distinct longitudinal microscopic morphology and can be distinguished by microscopy, but lyocell fiber and cupro fiber, bamboo charcoal viscose fiber and black viscose fiber, the two groups of fiber have basically the same longitudinal microscopic morphology and cannot be distinguished by microscopy.

[0041] Step 3: Use chemical dissolution method to distinguish lyocell fiber from cuprammonium fiber, bamboo charcoal viscose fiber from black viscose fiber which cannot be distinguished in step 1 and step 2:

[0042] S31, cut a small amount of single fiber reference substance (about 1g) and place it in a small beaker, add an appropriate amount of 35% hydrochloric acid solution or 60% sulfuric acid solution, immerse the sample in the solution, place it at room temperature for 5 minutes, and observe the dissolution of the reference substance; record the solubility of the reference substance in 35% hydrochloric acid and 60% sulfuric acid solutions, and summarize them into a table;

[0043] S32, cut a small amount of mask base material sample (about 1g) and place it in a small beaker, add appropriate amount of 35% hydrochloric acid solution or 60% sulfuric acid solution to immerse the sample in the solution, place it at room temperature for 5 minutes, observe the dissolution of the sample, and compare it with the fiber reference to determine the material of the sample.

[0044] The results showed that black viscose and lyocell fibers could be dissolved in two acid solutions; cuprammonia fibers could not be dissolved in 35% hydrochloric acid; bamboo charcoal particles were neither soluble in 35% hydrochloric acid nor in 60% sulfuric acid, and a large number of dark black particles appeared in the solution. Lyocell fibers and cuprammonia fibers, bamboo charcoal viscose fibers and black viscose fibers could be identified by the hydrochloric acid / sulfuric acid dissolution method.

[0045] Application Example 1

[0046] Taking the qualitative identification of pure cotton facial mask as an example, the identification method is as shown in step 1 in Example 1, and the sample is judged to be a pure cotton facial mask.

[0047] Application Example 2

[0048] Taking the qualitative identification of silk facial mask as an example, the identification method is as shown in step 1 of Example 1, and the sample is judged to be a silk facial mask.

[0049] Application Example 3

[0050] Taking the qualitative identification of polyester facial mask as an example, the identification method is as shown in step 1 in Example 1, and the sample is judged to be a polyester facial mask.

[0051] Application Example 4

[0052] Taking the qualitative identification of viscose fiber mask as an example, the identification method is as shown in step 1 and step 2 in Example 1, and the sample is judged to be a viscose fiber mask.

[0053] Application Example 5

[0054] Taking the qualitative identification of bamboo charcoal viscose fiber mask as an example, the identification method is as shown in step 1, step 2 and step 3 in Example 1, and the sample is judged to be a bamboo charcoal viscose fiber mask.

[0055] Application Example 6

[0056] Taking the qualitative identification of modal facial mask as an example, the identification method is as shown in steps 1 and 2 in Example 1, and the sample is judged to be a modal facial mask.

[0057] Application Example 7

[0058] Taking the qualitative identification of Lyocell fiber (Tencel fiber) facial mask as an example, the identification method is as shown in step one, step two and step three in Example 1, and the sample is judged to be a Lyocell fiber (Tencel fiber) facial mask.

[0059] Application Example 8

[0060] Taking the qualitative identification of the cuprammonia fiber mask as an example, the identification method is as shown in step one, step two and step three in Example 1, and the sample is judged to be a cuprammonia fiber mask.

[0061] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of the specification and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for qualitative identification of facial mask substrate fibers, characterized in that: The steps include: Step 1: Use infrared spectroscopy to make a preliminary judgment and classification of the mask base material; Step 2, using a microscope to further distinguish the regenerated cellulose fibers that cannot be distinguished in step 1; Step three, using a chemical dissolution method, to distinguish between lyocell fiber and cupro fiber, and between bamboo charcoal viscose fiber and black viscose fiber that cannot be distinguished in steps one and two.

2. The method for qualitative identification of facial mask substrate fibers according to claim 1, characterized in that: The step 1 includes the following specific methods: S11, placing a single-layer fiber reference substance on a sample pool, directly measuring it with an infrared spectrometer ATR accessory, collecting an infrared spectrum of the reference substance, performing baseline correction, smoothing, and peak analysis on the spectrum, and establishing a fiber infrared spectrum library; S12, placing a single-layer mask substrate sample on a sample pool, directly measuring it with an infrared spectrometer ATR accessory, collecting an infrared spectrum of the sample, performing baseline correction, smoothing, and peak analysis on the spectrum, and then searching in the fiber infrared spectrum library established in S11, and judging the material of the sample in combination with the characteristic absorption peaks of the compound.

3. The method for qualitative identification of facial mask substrate fibers according to claim 2, characterized in that: In S11 and S12, the infrared spectrum detection conditions are: single-point attenuated total reflection (ATR) infrared spectroscopy, Fourier transform infrared spectrometer, diamond wafer, scanning range 4000-650cm -1 , resolution 4.00cm -1 The number of sample scans was 50 times, and the background collection method was to collect background before each sample collection.

4. The method for qualitative identification of facial mask substrate fibers according to claim 3, characterized in that: Pure cotton, silk, and polymer fibers have their own characteristic peaks and can be identified by infrared spectroscopy, while the infrared characteristic peaks of regenerated cellulose fibers are basically the same, so they can only be classified as regenerated cellulose fibers.

5. The method for qualitatively identifying the facial mask substrate fiber according to claim 4, characterized in that: The regenerated cellulose fibers include one or more of viscose fibers, lyocell fibers, modal fibers, and cuprammonium fibers.

6. The method for qualitative identification of facial mask substrate fibers according to claim 1, characterized in that: The step 2 includes the following specific methods: S21, cut the single fiber reference into very small flocs, spread them evenly on a glass slide, drop a drop of transparent medium on them, cover them with a cover glass, place them on the stage, observe their longitudinal morphology under a 20x electron microscope, record the longitudinal morphological characteristics of the reference, and summarize them in a table; S22, cut the facial mask base material sample into very small flocs, spread them evenly on a glass slide, add a drop of transparent medium, cover with a coverslip, place on the stage, observe its longitudinal morphology under a 20x electron microscope, record the longitudinal morphological characteristics of the facial mask base material sample, and compare with the fiber reference product to determine the material of the sample.

7. The method for qualitatively identifying the facial mask substrate fiber according to claim 6, characterized in that: Viscose fiber and modal fiber have distinct longitudinal microscopic morphology and can be distinguished by microscopy. However, Lyocell fiber and cupro fiber, bamboo charcoal viscose fiber and black viscose fiber have basically the same longitudinal microscopic morphology and cannot be distinguished by microscopy.

8. The method for qualitative identification of facial mask substrate fibers according to claim 1, characterized in that: The step 2 includes the following specific methods: S31, cut a small amount of single fiber reference substance and place it in a small beaker, add an appropriate amount of 35% hydrochloric acid solution or 60% sulfuric acid solution, immerse the sample in the solution, place it at room temperature for 5 minutes, and observe the dissolution of the reference substance; record the solubility of the reference substance in 35% hydrochloric acid and 60% sulfuric acid solutions, and summarize them into a table; S32, cut a small amount of mask base material sample and place it in a small beaker, add appropriate amount of 35% hydrochloric acid solution or 60% sulfuric acid solution to immerse the sample in the solution, place it at room temperature for 5 minutes, observe the dissolution of the sample, and compare it with the fiber reference to determine the material of the sample.

9. The method for qualitatively identifying the facial mask substrate fiber according to claim 7, characterized in that: Black viscose fiber and lyocell fiber can be dissolved in two acid solutions; cuprammonia fiber cannot be dissolved in 35% hydrochloric acid; bamboo charcoal particles are neither soluble in 35% hydrochloric acid nor in 60% sulfuric acid, and a large number of dark black particles will appear in the solution.

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