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Application of formic acid/zinc chloride solution for quantitative analysis of Lyocell A100 in mixed fiber and analysis method thereof

A zinc chloride solution and mixed fiber technology, applied in the field of quantitative analysis of lyocell A100, can solve the problems of inability to measure the content of lyocell fibers, unstable test data, inability to accurately distinguish, etc., and achieve stable and reliable test values. The effect of strong practicability and simple reagent preparation

Inactive Publication Date: 2015-09-16
INSPECTION & QUARANTINE TESTING CENT OF HEBEI ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Because the properties of the three lyocells are similar, the current classical identification methods are not enough to effectively distinguish and identify them, and because the chemical properties of the three lyocells are similar, there will be a problem in the detection process: the same marked For products blended with lyocell fibers and certain fibers, the test data is unstable when the fiber content is tested, and the amount of lyocell A100, lyocell LF, and lyocell G100 cannot be accurately distinguished, and the amount of lyocell in blended fabrics cannot be determined. Lyocell A100 for quantitative analysis
[0006] Among the existing fiber content detection methods, GB / T 2910.6 discloses the formic acid / zinc chloride method for quantitative analysis of viscose fiber, some cupro ammonia fiber, and modal fiber Or the method of the mixture of lyocell fiber and cotton, patent CN1940525A discloses a kind of hydrochloric acid method quantitative analysis method for the mixture of lyocell and cotton; But both belong to the method of quantitative analysis a kind of mixture of regenerated cellulose fiber and cotton Quantitative analysis method, for the mixed fabric of two or more regenerated cellulose fibers, such as a mixture of viscose fiber and lyocell fiber, the content of lyocell fiber cannot be determined

Method used

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  • Application of formic acid/zinc chloride solution for quantitative analysis of Lyocell A100 in mixed fiber and analysis method thereof
  • Application of formic acid/zinc chloride solution for quantitative analysis of Lyocell A100 in mixed fiber and analysis method thereof
  • Application of formic acid/zinc chloride solution for quantitative analysis of Lyocell A100 in mixed fiber and analysis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Solvent Screening

[0041] The principle of the invention is to dissolve and remove other regenerated cellulose fibers from a mixture of known dry mass, collect residual Lyocell A100, and calculate its percentage in dry mass of the mixture after cleaning, drying and weighing. This gives the quality score for Lyocell A100.

[0042] Since regenerated cellulose fibers have similar physical and chemical properties, solvents that can dissolve regenerated cellulose fibers such as viscose fibers can also dissolve Lyocell A100. For example, the principle used in GB / T2910.6 is to use formic acid / zinc chloride The solution dissolves viscose fiber, cupro fiber or lyocell fiber, but does not dissolve cotton fiber. By detecting the mass of remaining cotton fiber, the mass fraction of cotton fiber or regenerated fiber blended with it is calculated.

[0043] The present invention has screened the viscose fiber dissolving, the solvent which does not dissolve the lyocell A1...

Embodiment 2

[0057] Example 2 Effects of Different Contents of Zinc Chloride on the Quantitative Detection of Lyocell A100

[0058] Weighed different zinc chlorides and added them to 80g of 88% formic acid to detect the impact on quantitative detection under different zinc chloride contents. The test results are shown in Table 2.

[0059] Table 2 The effect of zinc chloride content on the quantitative detection of Lyocell A100

[0060]

[0061] Note: d is the mass change correction factor for Lyocell A100.

[0062] From the above results, it can be seen that the preparation ratio of zinc chloride and 88% formic acid in the formic acid / zinc chloride solution is between 10:80-30:80, which has a certain influence on the test results. The presence of zinc chloride can promote the reaction to a certain extent. When the content of zinc chloride decreases, the reaction time will be extended accordingly; however, the content of zinc chloride has little effect on the d value. Considering t...

Embodiment 3

[0063] Example 3 Effects of Different Bath Ratio on Quantitative Detection of Lyocell A100

[0064] Under the conditions of dissolution temperature of 44°C, time of 90min, and oscillation frequency of 100 times / min, the bath ratio was changed, and Lyocell A100 was measured. The effect of liquor ratio on the experimental results is shown in Table 3.

[0065] Table 3 The effect of bath ratio change on the quantitative detection of Lyocell A100

[0066]

[0067] From the above results, it can be seen that the bath ratio is directly related to the d value of Lyocell A100. When the bath ratio is less than 1:100, the liquid formed after dissolution will be viscous due to the small volume of the solution, which is not conducive to filtration and cleaning. When the bath ratio reaches 1:1500, the d value tends to be stable. When the bath ratio is between 1:50 and 1:1500, the variation range of d value is between 1.09-1.19. Considering the general method of fiber quantitative an...

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Abstract

The invention relates to a quantitative analysis of Lyocell A100 in mixed fiber, a quantitative analysis is carried out on Lyocell A100 in mixed fiber composed of viscose fiber, modal fiber and bamboo fiber and Lyocell A100 by a formic acid / zinc chloride solution with zinc chloride and formic acid by mass ratio of 1-3: 6.5-7.5. According to the invention, final quantification determination can be realized through a drafting standard curve, detection can be realized when the theory content of Lyocell A100 reaches 5%, enforcement performance is strong, and the method has important meaning for identifying quality of regenerated fiber blended textiles.

Description

technical field [0001] The present invention relates to the quantitative analysis of Lyocell A100 in mixed fibers. Background technique [0002] Due to the reduction of cultivated land and the depletion of petroleum resources, the production of natural fibers and synthetic fibers has been more and more restricted. People pay more and more attention to the development and utilization of regenerated cellulose fibers while emphasizing the environmental performance of textiles. Regenerated cellulose fiber belongs to natural cellulose regenerated fiber. Its structure is very similar to cotton fiber, but it has silk-like excellent performance that cotton fiber does not have. Regenerated cellulose fiber is a kind of "green" fiber with excellent performance. Its waste and waste can be degraded naturally. Regenerated cellulose fiber is the direction of future development and an effective way to solve the shortage of natural resources. [0003] Regenerated cellulose fiber refers to ...

Claims

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Application Information

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IPC IPC(8): G01N5/04
Inventor 高友军刘锦瑞张向丽赵素敏董亚楠尚雪莹孙丽霞王文丽
Owner INSPECTION & QUARANTINE TESTING CENT OF HEBEI ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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