CN111982738A - Quantitative analysis method of cross-linked lyocell fibers and viscose fibers - Google Patents
Quantitative analysis method of cross-linked lyocell fibers and viscose fibers Download PDFInfo
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Abstract
The invention relates to a quantitative analysis method of cross-linked lyocell fibers and viscose fibers, which comprises the following steps: weighing a sample, dissolving the sample by formic acid/zinc chloride solution, filtering by a screen, washing the filtered residue by formic acid/zinc chloride solution, washing by sodium dodecyl sulfate solution and water, and finally utilizingdThe fiber content was calculated by a value method. The method is simple and convenient, and has good stability and high detection accuracy.
Description
Technical Field
The invention belongs to the technical field of lyocell fiber detection, and particularly relates to a quantitative analysis method for cross-linked lyocell fibers and viscose fibers.
Background
Among the existing methods for measuring fiber content, GB/T2910.6 discloses a method for quantitatively analyzing viscose fibers, certain cuprammonium fibers, modal fibers or a mixture of lyocell fibers and cotton by a formic acid/zinc chloride method. Chinese patent CN1940525A discloses a method for quantitative analysis of a mixture of lyocell and cotton by hydrochloric acid method.
For a mixed fabric of two or more regenerated cellulose fibers, Chinese patent CN104764671A discloses a new application of formic acid/zinc chloride solution and a quantitative analysis method of lyocell A100 in the mixed fiber, which comprises the steps of pretreating a sample, soaking the sample in the formic acid/zinc chloride solution to collect insoluble substances, washing the insoluble substances with the formic acid/zinc chloride solution, washing the insoluble substances with water, neutralizing the insoluble substances with dilute ammonia water, collecting the final insoluble substances, drying, and weighing to calculate the net dry mass fraction of lyocell A100. The method uses a mass change correction factordThe net dry mass of lyocell a100 was corrected and the ratio of this to the net dry mass of the unknown sample was used to calculate the net dry mass fraction of lyocell a100 in the unknown sample. And the mass change correction factor of the methoddThe values are not constant (example 7) but vary according to the content of lyocell fibre, given quantitative analysis being both influential and troublesome when the lyocell a100 content in the sample is unknown.
Chinese patent CN104914001A also discloses the application of formic acid/zinc chloride solution in the quantitative analysis of lyocell A100 in mixed fiber and the analysis method thereof, the concrete method is basically the same as Chinese patent CN104764671A, the difference is that the standard curve method is used to replace the standard curve methoddThe net dry mass fraction of the lyocell A100 is determined by value correction, and the standard curve requires drawing the standard curve before quantitative detection, and the detection process also requires highly consistent experimental conditions and complicated operation.
Disclosure of Invention
The invention aims to provide a quantitative analysis method of cross-linked lyocell fibers and viscose fibers, which is simple and convenient in method, good in stability and high in detection accuracy.
The invention adopts the following technical scheme:
a quantitative analysis method of cross-linked lyocell fibers and viscose fibers comprises the following steps:
(1) drying and weighing the sample to obtain the net dry mass of the sample;
(2) immersing a sample into a formic acid/zinc chloride solution, and carrying out oscillation reaction in a constant-temperature water bath oscillator with the temperature of 40-50 ℃ (preferably 44 ℃) for 30-150 min (preferably 90 min); pouring the insoluble substances into a stainless steel screen mesh, and filtering;
(3) immersing the residue in the screen into 40-50 ℃ (preferably 44 ℃) formic acid/zinc chloride solution with the same volume as that in the step (2), shaking, washing and filtering;
(4) immersing the filtered insoluble substance into a sodium dodecyl sulfate solution, oscillating, washing and filtering; repeating the steps once; the volume of the sodium dodecyl sulfate solution is 1-3 times (preferably 2 times) of the volume of the formic acid/zinc chloride solution; the concentration of the sodium dodecyl sulfate solution is 0.5-3 g/L (preferably 1 g/L);
(5) washing the insoluble substance obtained in the step (4) with water at normal temperature to 50 ℃ (preferably 44 ℃); repeating for three times;
(6) after water washing, soaking the remainder in dilute acetic acid for 5-20 min (preferably 10 min), then washing with water, drying and weighing to obtain the net dry mass of the cross-linked lyocell fiber;
(7) and calculating the net dry mass fraction of the crosslinking lyocell fiber.
Wherein the drying temperature of the step (1) and the step (7) is 102-108 ℃ (preferably 105 ℃).
In the step (2), the formic acid/zinc chloride solution is formed by mixing anhydrous zinc chloride, anhydrous formic acid and water, and the mass ratio of the anhydrous zinc chloride to the anhydrous formic acid to the water is 15-25: 60-80: 5-15 (preferably 20: 68: 12).
Wherein in the step (2), the oscillation frequency is 80-120 times/min.
In the step (6), the concentration of the dilute acetic acid is 25 mL-50 mL (preferably 40 mL) of glacial acetic acid dissolved in each liter of water.
Wherein the calculation formula of the step (7) is as follows:
wherein the content of the first and second substances,Pis the net dry mass fraction of the cross-linked lyocell in the sample,%;
da mass change correction factor for cross-linked lyocell;
m 1is the net dry mass, g, of the remaining cross-linked lyocell;
m 0is the neat dry mass of the sample, g.
The invention has the beneficial effects that: the invention adopts a unique washing method, namely, the formic acid/zinc chloride solution is manually oscillated and washed, then the sodium dodecyl sulfate is manually oscillated and washed, finally the water washing and the dilute acetic acid soaking are carried out, the cross-linking type lyocell fiber and the viscose fiber are treated, and the defects that the prior art uses ultrasonic wave to wash and causes different concentrations are overcomedThe value being non-constant and not usable conventionallydThe value method is used for calculating the fiber content. The method of the invention uses less harmful reagent, does not need other instruments in the washing process, and does not consider factors which can damage the fiber per se, such as washing temperature change, instrument power and the like caused by the instruments. The method of the inventiondThe value is not affected by the content of the crosslinked lyocell fiber, is smaller and more stable, and the conventional value can be useddThe value method is used for calculating the fiber content, and the operation is more convenient.
Detailed Description
The present invention is further described with reference to the following specific embodiments, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and the present invention shall be covered thereby.
Preparation of the samples
Since there are no standard samples of the cross-linked lyocell and viscose blends on the market, the samples used in the following examples and comparative examples at each content were prepared by themselves using the following two types of fibers.
Crosslinked lyocell fiber: produced by the Lanjing Group (Lenzing Group);
viscose fiber: produced by technical supervision of textile industry in Shanghai city, standard substances are split into yarns before use.
Preparation of crosslinked Lyocell content (p A100) About 5%, 10%, 60% and 90% of the samples, respectively.
Preparation of reagents
Formic acid/zinc chloride solution: 20 g of anhydrous zinc chloride (mass fraction > 98%) and 68 g of anhydrous formic acid were added to 100 g of water.
Diluted ammonia water: 20mL of concentrated ammonia (density 0.880 g/mL) was diluted to 1000mL and mixed well.
Sodium dodecyl sulfate solution: 1.0 g of sodium dodecylsulfate was dissolved in 1L of water.
Dilute acetic acid: 40mL of glacial acetic acid was taken and diluted to 1L with water.
Instrumentation and equipment
A dryer: the color-changing silica gel is filled;
analytical balance: the sensory quantity is 0.0001 g or better than 0.0001 g;
drying the oven: can keep the temperature at (105 +/-3) DEG C;
a constant-temperature water bath oscillator: the temperature control precision is +/-1 ℃, and the oscillation frequency is 80-120 times/min;
stainless steel screen mesh: (60-65) mesh.
Examples
1. Weighing sample
And weighing the cross-linked lyocell fibers and the viscose fibers according to the proportion required by the preparation of the sample, drying and weighing the cross-linked lyocell fibers and the viscose fibers, and mixing the two fibers.
2. Dissolution
And putting the prepared cross-linked lyocell fiber and viscose fiber mixture sample into a conical flask containing a formic acid/zinc chloride solution preheated to 44 ℃, and reacting for 90min in a constant-temperature water bath oscillator at 44 ℃.
3. Washing and neutralizing
Pouring the reaction residues into a stainless steel screen, naturally leaking the filtrate, extruding the residues in the screen by using a glass rod or forceps to ensure that the reaction liquid adhered to the residues is as little as possible, putting the residues back into the conical flask, pouring a formic acid/zinc chloride solution with the volume being 44 ℃ which is the same as that of the dissolved formic acid/zinc chloride solution, pressing the bottle stopper, forcibly oscillating the conical flask to fully wash the residues, pouring the residues into the stainless steel screen, and putting the conical flask back after extrusion. Pouring sodium dodecyl sulfate solution with 2 times volume of the sodium dodecyl sulfate solution when the sodium dodecyl sulfate solution is dissolved, compacting the plug, shaking forcefully, pouring into a stainless steel screen again, and repeating the operation once more by using the sodium dodecyl sulfate solution. The washing was repeated three times using water at 44 ℃. Washing with water, soaking in dilute acetic acid for 10 min, and washing with water.
4. Drying and weighing
Squeezing the residual water in the residue, putting into a weighing bottle, drying, cooling and weighing.
Comparative example
Step 1 and step 2 are the same as the example, except that the washing and neutralization process of step 3 specifically comprises:
pouring the reaction residues into a stainless steel screen, naturally leaking the filtrate, squeezing the residues in the screen by using a glass rod or tweezers to ensure that the reaction liquid is adhered as little as possible, putting the residues back into a conical flask, pouring 44 ℃ formic acid/zinc chloride solution with the volume same as that of the solution when the residues are dissolved, covering the conical flask with a plug, putting the conical flask into an ultrasonic cleaner with the temperature of 44 ℃ for ultrasonic cleaning for 1 min, pouring the conical flask into the stainless steel screen again, and repeating the steps once. The above procedure was repeated three times using water at 44 ℃. Washing with water, soaking in dilute ammonia water for 10 min, and washing with water.
Analysis of results
After the mixture of the crosslinked lyocell and viscose was treated by the method described in the examples, the viscose was completely dissolved, the reacted solution was slightly viscous, and the remaining crosslinked lyocell fiber did not have the original fiber state, forming a transparent viscous gel. Comparative examples were difficult to clean thoroughly using only formic acid/zinc chloride solution.
After researching the production process of the viscose, the viscose is washed once by formic acid/zinc chloride, washed by sodium dodecyl sulfate solution, soaked for 10 min by acetic acid solution, and the measurement results of samples which are dried, weighed and have different cross-linking lyocell fiber contents are shown in table 1.
TABLE 1 measurement results using the example treatment method
Wherein the content of the first and second substances,
。
the data in Table 1 show the ratio of the original mass of the crosslinked lyocell fiber to the residual mass after the reaction, i.e., the coefficient of mass change correction of the crosslinked lyocell fiberdThe value is less variable with the content of the crosslinked lyocell fibers, ranges from 0.98 to 1.01, is stable, and is stable only when the content of the crosslinked lyocell fibers in the mixture is 5%dThe value is larger and is 1.00, and with the increase of the content of the crosslinking type lyocell fiber,dthe value was finally stabilized to 0.98, and it was thus confirmed that the crosslinked lyocell fiber obtained by the above-mentioned method was obtaineddThe value is 0.98 and conventional washing methods can be used after washing using the method of the exampledThe fiber content was calculated by a value method.
The comparative example has the same dissolution conditions as the example method, but the washing process is very different, and the washing is performed using an ultrasonic cleaner, and the experimental data are shown in table 2.
Table 2 measurement results using the comparative example treatment method
The data in Table 2 show that for samples of the same content of crosslinked lyocell fibers, the same content of crosslinked lyocell fibers was obtained after treatment using the method of the comparative exampledThe values are substantially consistent, indicating that the process is more stable, but for samples of different levels, the crosslinked lyocell fibersdThe values vary and range from 1.11 to 1.19. Meanwhile, the temperature is strictly controlled by the ultrasonic cleaning operation requirement, and the water temperature controlled by an instrument in the ultrasonic process may deviate from the set temperature to a certain extent, so that the measurement result is greatly influenced; the method can thoroughly clean the sample, and not only can wash off the dissolved viscose fiber, but also can wash off the viscose fiberThis phenomenon is particularly remarkable for a sample with a low content of crosslinked lyocell, by removing a part of the unstable crosslinked lyocell fibersdThe value is larger; the above-mentioned effects are gradually reduced with the increase of the crosslinked lyocell fibers, and finally, the effects are further reduceddThe value stabilized at 1.11. A method of washing using ultrasonic waves is used,dthe value has a certain relationship with the content of the crosslinked lyocell fiber and is not a stable value, so that the method of comparative example is not suitable for the conventional methoddThe content of the crosslinked lyocell fiber and the viscose fiber was calculated by a numerical method.
The examples have the following advantages compared with the comparative examples: only formic acid/zinc chloride solution is used for washing for 1 time, and the amount of harmful reagent is less; other instruments are not needed, and the operation is more convenient; the influence of factors such as washing temperature change, instrument power and the like caused by the instrument is not considered;dthe value is smaller and more stable; can use the conventionaldThe value method is used for calculating the fiber content.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A quantitative analysis method of cross-linked lyocell fibers and viscose fibers is characterized by comprising the following steps:
(1) drying and weighing the sample to obtain the net dry mass of the sample;
(2) immersing a sample into a formic acid/zinc chloride solution, and carrying out oscillation reaction in a constant-temperature water bath oscillator at 40-50 ℃ for 30-150 min; pouring the insoluble substances into a stainless steel screen mesh, and filtering;
(3) immersing the remainder in the screen into 40-50 ℃ formic acid/zinc chloride solution with the same volume as that in the step (2), oscillating and washing, and filtering by using a stainless steel screen;
(4) immersing the filtered insoluble substance into a sodium dodecyl sulfate solution, oscillating and washing, and filtering by a stainless steel screen; repeating the steps once; the volume of the sodium dodecyl sulfate solution is 1-3 times of that of the formic acid/zinc chloride solution; the concentration of the sodium dodecyl sulfate solution is 0.5-3 g/L;
(5) washing the insoluble substance obtained in the step (4) with water at room temperature to 50 ℃, and filtering with a stainless steel screen; repeating for three times;
(6) after water washing, soaking the remainder in dilute acetic acid for 5-20 min, then washing with water, drying and weighing to obtain the net dry mass of the cross-linked lyocell fiber;
(7) and calculating the net dry mass fraction of the crosslinking lyocell fiber.
2. The method for quantitatively analyzing the crosslinked lyocell fibers and the viscose fibers according to claim 1, wherein the drying temperature in the steps (1) and (7) is 102 to 108 ℃.
3. The quantitative analysis method for the cross-linked lyocell fibers and the viscose fibers according to claim 1, wherein in the step (2), the formic acid/zinc chloride solution is formed by mixing anhydrous zinc chloride, anhydrous formic acid and water, and the mass ratio of the anhydrous zinc chloride to the anhydrous formic acid to the water is 15-25: 60-80: 5-15.
4. The method for quantitatively analyzing crosslinked lyocell fibers and viscose fibers according to claim 1, wherein the oscillation frequency in the step (2) is 80 to 120 times/min.
5. The quantitative analysis method for the cross-linked lyocell fibers and the viscose fibers according to claim 1, wherein in the step (6), the concentration of the dilute acetic acid is 25mL to 50mL of glacial acetic acid per liter of water.
6. The method for quantitatively analyzing crosslinked lyocell and viscose according to claim 1, wherein the calculation formula of the step (7) is:
wherein the content of the first and second substances,Pis the net dry mass fraction of the cross-linked lyocell in the sample,%;
da mass change correction factor for cross-linked lyocell;
m 1 is the net dry mass, g, of the remaining cross-linked lyocell;
m 0is the neat dry mass of the sample, g.
7. The quantitative analysis method for the cross-linked lyocell fibers and the viscose fibers according to claim 1, wherein the stainless steel screen is 60-65 mesh.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1772967A (en) * | 2005-11-02 | 2006-05-17 | 哈尔滨工业大学 | Use of 12 sodium alkyl sulfonate 12 alkylbenzene sodium alkyl sulfonate, diphenylamine-4-sodium alkyl sulfonate in surface micro-arc oxidation technology |
| CN104764736A (en) * | 2015-03-30 | 2015-07-08 | 河北出入境检验检疫局检验检疫技术中心 | Method for identifying lyocell A100 and application of method |
| CN104764671A (en) * | 2015-03-30 | 2015-07-08 | 河北出入境检验检疫局检验检疫技术中心 | New application of formic acid/zinc chloride solution and quantitative analysis method of lyocell A100 in blend fiber |
| CN104914001A (en) * | 2015-03-30 | 2015-09-16 | 河北出入境检验检疫局检验检疫技术中心 | Application of formic acid/zinc chloride solution for quantitative analysis of Lyocell A100 in mixed fiber and analysis method thereof |
| CN104963201A (en) * | 2015-06-26 | 2015-10-07 | 西南大学 | Method for preparing super-hydrophobic dacron fabric |
| CN109112657A (en) * | 2018-08-21 | 2019-01-01 | 桐庐雷泰生物科技有限公司 | A kind of spontaneous heating cellulose fibre and its preparation method and application |
| CN110453311A (en) * | 2019-09-23 | 2019-11-15 | 浙江理工大学 | A kind of warming chitin fiber and preparation method thereof |
| CN110725141A (en) * | 2019-11-18 | 2020-01-24 | 武汉纺织大学 | Enzyme-dyed lyocell fiber fabric and preparation method thereof |
-
2020
- 2020-07-22 CN CN202010713975.4A patent/CN111982738B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1772967A (en) * | 2005-11-02 | 2006-05-17 | 哈尔滨工业大学 | Use of 12 sodium alkyl sulfonate 12 alkylbenzene sodium alkyl sulfonate, diphenylamine-4-sodium alkyl sulfonate in surface micro-arc oxidation technology |
| CN104764736A (en) * | 2015-03-30 | 2015-07-08 | 河北出入境检验检疫局检验检疫技术中心 | Method for identifying lyocell A100 and application of method |
| CN104764671A (en) * | 2015-03-30 | 2015-07-08 | 河北出入境检验检疫局检验检疫技术中心 | New application of formic acid/zinc chloride solution and quantitative analysis method of lyocell A100 in blend fiber |
| CN104914001A (en) * | 2015-03-30 | 2015-09-16 | 河北出入境检验检疫局检验检疫技术中心 | Application of formic acid/zinc chloride solution for quantitative analysis of Lyocell A100 in mixed fiber and analysis method thereof |
| CN104963201A (en) * | 2015-06-26 | 2015-10-07 | 西南大学 | Method for preparing super-hydrophobic dacron fabric |
| CN109112657A (en) * | 2018-08-21 | 2019-01-01 | 桐庐雷泰生物科技有限公司 | A kind of spontaneous heating cellulose fibre and its preparation method and application |
| CN110453311A (en) * | 2019-09-23 | 2019-11-15 | 浙江理工大学 | A kind of warming chitin fiber and preparation method thereof |
| CN110725141A (en) * | 2019-11-18 | 2020-01-24 | 武汉纺织大学 | Enzyme-dyed lyocell fiber fabric and preparation method thereof |
Non-Patent Citations (5)
| Title |
|---|
| 刘增林等: "头发样品采集与洗涤", 《预防医学文献信息》 * |
| 刘锦瑞等: "染色莱赛尔/粘胶混纺产品的定量分析", 《印染》 * |
| 李军: "毛发中常见毒品分析的研究进展", 《铁道警察学院学报》 * |
| 李振华等: "酶洗加工中影响纤维素酶活力的因素分析", 《印染》 * |
| 高友军等: "再生纤维素纤维中莱赛尔族纤维定性鉴别研究", 《纺织导报》 * |
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