Quantitative analysis method for hemp / viscose blended product

Abstract

The quantitative analysis method for the hemp / viscose blended product disclosed by the embodiment of the invention comprises the following steps: mixing pure hemp and pure viscose with a preset mass ratio in the hemp / viscose blended product to obtain a sample; putting the sample into a conical flask containing a formic acid / zinc chloride solution with a preset temperature of (70 + / -2) DEG C, oscillating for 13 minutes, and filtering to obtain residues; the residues are cleaned, sucked, drained and neutralized, and neutral residues are obtained; drying, cooling and weighing the neutral residues to obtain the dry mass of the dry residues; and determining the mass percentage contents of the pure hemp and the pure viscose according to the dry mass of the dry residues, the mass correction coefficient of the pure hemp and the preset mass of the sample. According to the embodiment of the invention, the samples of the pure hemp and the pure viscose in the preset mass ratio are dissolved in the formic acid / zinc chloride solution at the temperature of (70 + / -2) DEG C for 13 minutes, so that the content of the hemp / viscose can be rapidly detected, the detection period is short, and the accuracy rate is high.

Description

Technical Field

[0001] The invention relates to the technical field of textile fiber detection, in particular to a quantitative analysis method for hemp / viscose blended products. Background Art

[0002] Hemp fiber is cool, breathable, has good moisture absorption, and is a strong thermal conductor. It also boasts the strongest natural fiber and antibacterial properties. Hemp fiber is one of the finer and softer hemp fibers, with a fineness only about half that of ramie and comparable to cotton. Hemp fiber tips are blunt and rounded, unlike the sharp tips of ramie and linen. Hemp textiles are soft and conformable, and are less itchy and rough than linen and ramie. Viscose fiber has excellent moisture absorption, drape, and a soft feel, but also has lower wet strength. Hemp / viscose blends improve the hand feel and elasticity of pure hemp products while retaining their breathability, moisture absorption, and antibacterial and mildew-resistant properties. Consequently, hemp / viscose blends are increasingly used in routine testing. However, existing testing methods for hemp / viscose blends are limited, require long testing cycles, and have low accuracy. Summary of the Invention

[0003] Therefore, in order to overcome at least some of the defects and shortcomings in the prior art, an embodiment of the present invention provides a quantitative analysis method for hemp / viscose blended products. The sample is dissolved in a formic acid / zinc chloride solution at a temperature of (70±2)°C for 13 minutes, and the mass percentage of pure hemp and pure viscose in the hemp / viscose blended product is determined based on the dry mass of the dry residue, the mass correction coefficient of pure hemp, and the preset mass of the sample. This method can be used as a new method for quickly detecting hemp / viscose content, with a short detection cycle and high accuracy, which can improve the detection efficiency of the enterprise.

[0004] On the one hand, an embodiment of the present invention provides a quantitative analysis method for a hemp / viscose blended product, for example, comprising: unraveling pure hemp and pure viscose with a preset mass ratio in the hemp / viscose blended product and mixing them to obtain a sample, wherein the preset mass ratio includes: 10 / 90, 30 / 70, 50 / 50, 70 / 30 and 90 / 10; placing the sample in multiple conical flasks containing a formic acid / zinc chloride solution at a preset temperature of (70±2)°C, shaking for 13 minutes, filtering to obtain a residue, wherein 100 mL of the formic acid / zinc chloride solution is added per gram of the sample; washing the residue with 10 ml of a 70°C formic acid / zinc chloride solution, and rinsing with 70°C formic acid / zinc chloride solution. The residue is transferred into a glass sand core crucible with water, the liquid is sucked out with a suction filtration device, and then the residue is thoroughly washed with 70°C water, the residue is neutralized with 100mL of dilute ammonia solution, and the residue is allowed to contact with the dilute ammonia solution for 10 minutes, and the liquid is sucked out with the suction filtration device, and the residue is washed with cold water until neutral to obtain a neutral residue; the neutral residue is dried, cooled, and weighed to obtain a dry residue; the mass correction coefficient of pure hemp is determined; and the mass percentage of the pure hemp and the pure viscose in the hemp / viscose blended product is determined according to the mass of the dry residue, the mass correction coefficient of the pure hemp, and the mass of the sample.

[0005] On the other hand, an embodiment of the present invention provides a quantitative analysis method for hemp / viscose blended products, comprising: unraveling pure hemp and pure viscose with a preset mass ratio in the hemp / viscose blended product and mixing them to obtain a sample, wherein the mass of the sample is a preset mass; placing the sample in a conical flask containing a formic acid / zinc chloride solution at a preset temperature of (70±2)°C, shaking it for 13 minutes, and filtering to obtain a residue, wherein 100 mL of the formic acid / zinc chloride solution is added to each gram of the sample; washing the residue, draining it by suction, and neutralizing it to obtain a neutral residue; drying and cooling the neutral residue, and weighing it to obtain the dry mass of the dry residue; determining the mass percentage of the pure hemp and the pure viscose in the hemp / viscose blended product based on the dry mass of the dry residue, the mass correction coefficient of the pure hemp, and the preset mass of the sample.

[0006] In one embodiment of the present invention, the preset mass ratios of the pure hemp to the pure viscose include 10 / 90, 30 / 70, 50 / 50, 70 / 30 and 90 / 10.

[0007] In one embodiment of the present invention, the method further includes: determining the mass correction coefficient of the pure hemp, wherein the method specifically includes: dissolving the pure hemp having an initial mass in a formic acid / zinc chloride solution at 70° C. for 13 minutes to obtain residual hemp; and determining the mass correction coefficient of the pure hemp based on the mass of the residual hemp and the initial mass of the pure hemp.

[0008] In one embodiment of the present invention, the mass ratio of anhydrous zinc chloride, anhydrous formic acid and water in the formic acid / zinc chloride solution is 20:68:12.

[0009] In one embodiment of the present invention, the cleaning, suction and drainage of the residue, and neutralization to obtain a neutral residue specifically include: washing the residue with 10 ml of 70°C formic acid / zinc chloride solution, transferring all the residue into a glass sand core crucible with 70°C water, suction and drainage with a suction filtration device, and then washing it thoroughly with 70°C water, neutralizing the residue with 100 mL of dilute ammonia solution, and contacting the residue with the dilute ammonia solution for 10 minutes, suction and drainage with the suction filtration device, and washing the residue with cold water until neutral to obtain the neutral residue.

[0010] In one embodiment of the present invention, the dilute ammonia solution is obtained by diluting 20 mL of ammonia water with a density of 0.880 g / mL with water to 1 L.

[0011] In one embodiment of the present invention, the mass percentage of the pure cannabis satisfies: Wherein, P is the mass percentage of the pure cannabis, is the dry mass of the dry residue, is the preset mass of the sample, and d is the mass correction coefficient of the cannabis.

[0012] In one embodiment of the present invention, the mass correction factor of the pure cannabis is 0.98.

[0013] As can be seen from the above, the above technical solution has at least one or more of the following beneficial effects:

[0014] In an embodiment of the present invention, samples of pure hemp and pure viscose in a preset mass ratio are dissolved in a formic acid / zinc chloride solution at a preset temperature of (70±2)°C for 13 minutes, and the mass percentages of the pure hemp and the pure viscose in the hemp / viscose blended product are determined based on the dry mass of the dried residue, the mass correction coefficient of the pure hemp, and the preset mass of the sample. This method can be used as a new method for quickly detecting the hemp / viscose content, has a short detection cycle, high accuracy, and can improve the detection efficiency of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0016] Figure 1 A schematic flow chart of a quantitative analysis method for hemp / viscose blended products provided in an embodiment of the present invention.

[0017] Figure 2 A schematic flow chart of another quantitative analysis method for hemp / viscose blended products provided in an embodiment of the present invention.

[0018] Figure 3 for Figure 2 FIG. 1 is a schematic diagram showing a specific flow chart of step S18. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 those skilled in the art without making creative efforts should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] It should also be noted that the division of multiple embodiments in the present invention is only for the convenience of description and should not constitute a special limitation. The features in various embodiments can be combined and referenced to each other without contradiction.

[0023] like Figure 1 As shown, the embodiment of the present invention provides a quantitative analysis method for hemp / viscose blended products, for example, including:

[0024] S11: Mixing pure hemp and pure viscose with a preset mass ratio in the hemp / viscose blended product after unraveling to obtain a sample, wherein the mass of the sample is a preset mass;

[0025] S13: The sample is placed in a conical flask containing a formic acid / zinc chloride solution at a preset temperature of (70±2)°C, and shaken for 13 minutes. The residue is filtered to obtain a residue, wherein 100 mL of the formic acid / zinc chloride solution is added for every gram of the sample;

[0026] S15: washing, draining, and neutralizing the residue to obtain a neutral residue;

[0027] S17: drying and cooling the neutral residue, and weighing the residue to obtain a dry mass;

[0028] S19: Determine the mass percentage of the pure hemp and the pure viscose in the hemp / viscose blended product according to the dry mass of the dry residue, the mass correction coefficient of the pure hemp, and the preset mass of the sample.

[0029] Therefore, in an embodiment of the present invention, samples of pure hemp and pure viscose in a preset mass ratio are dissolved in a formic acid / zinc chloride solution at a preset temperature of (70±2)°C for 13 minutes, and the mass percentages of the pure hemp and the pure viscose in the hemp / viscose blended product are determined based on the dry mass of the dry residue, the mass correction coefficient of the pure hemp, and the preset mass of the sample. This method can be used as a new method for quickly detecting the hemp / viscose content, with a short detection cycle and high accuracy, which can improve the detection efficiency of the enterprise.

[0030] In addition, if Figure 2 As shown, the quantitative analysis method of hemp / viscose blended products provided by the embodiment of the present invention further includes: S18: determining the mass correction coefficient of the pure hemp. Figure 3 As shown, the determination of the mass correction factor of the pure cannabis may specifically include:

[0031] S18a: placing the pure cannabis of the initial mass into a formic acid / zinc chloride solution at 70° C. and dissolving for 13 minutes to obtain residual cannabis;

[0032] S18b: Determine the mass correction factor of the pure cannabis according to the mass of the residual cannabis and the initial mass of the pure cannabis.

[0033] Alternatively, when pure cannabis samples of different colors were dissolved in a formic acid / zinc chloride solution at 70°C for 13 minutes, the mass correction coefficients of brown and white cannabis were not significantly different, indicating that color depth has little effect on the mass correction coefficient of pure cannabis. Preferably, the mass correction coefficient of pure cannabis is, for example, 0.98.

[0034] Next, the steps of washing, draining, and neutralizing the residue in step S15 to obtain a neutral residue may specifically include:

[0035] The residue is washed with 10 ml of a 70°C formic acid / zinc chloride solution, and the entire residue is transferred to a glass crucible with 70°C water. The residue is then aspirated and drained using a suction filter, and then thoroughly rinsed with 70°C water. The residue is then neutralized with 100 ml of a dilute ammonia solution, and allowed to contact the dilute ammonia solution for 10 minutes. The residue is then aspirated and drained using the suction filter, and the residue is rinsed with cold water until neutralized to obtain the neutral residue. The glass crucible, for example, is a glass crucible of known dry mass.

[0036] Furthermore, the preset mass ratios of pure hemp and pure viscose in the hemp / viscose blended product include, for example, 10 / 90, 30 / 70, 50 / 50, 70 / 30, and 90 / 10. The mass ratios of anhydrous zinc chloride, anhydrous formic acid, and water in the formic acid / zinc chloride solution are, for example, 20:68:12. The dilute ammonia solution is, for example, prepared by diluting 20 mL of 0.880 g / mL ammonia water to 1 L with water.

[0037] Furthermore, the mass percentage of the pure cannabis satisfies, for example:

[0038]

[0039] Wherein, P is the mass percentage of the pure cannabis, m□ is the dry mass of the dried residue, m□ is the preset mass of the sample, and d is the mass correction coefficient of the cannabis.

[0040] To facilitate a clearer understanding of the quantitative analysis method for the hemp / viscose blended product of this embodiment, an example will be given below to illustrate it in detail.

[0041] Pure hemp and viscose samples with a predetermined mass ratio from a hemp / viscose blend were unspun and mixed in varying mass ratios (10 / 90, 30 / 70, 50 / 50, 70 / 30, and 90 / 10) to produce samples. The mass of the sample was the predetermined mass. The samples were placed in Erlenmeyer flasks containing a preheated formic acid / zinc chloride solution at (70±2)°C. 100 mL of formic acid / zinc chloride solution was added per gram of sample, and the flasks were tightly capped. The flasks were shaken to wet the samples and then oscillated at (70±2)°C for 13 minutes, with two manual shakes. After the final oscillation, the residue in the flasks was filtered using a glass crucible with a known dry mass and rinsed with 10 mL of 70°C formic acid / zinc chloride solution. Transfer the entire residue to a glass crucible using 70°C water. Drain the residue using a suction filter. Rinse thoroughly with 70°C water. Neutralize the residue with 100 mL of dilute ammonia solution, leaving the residue in contact with the solution for 10 minutes. Drain the residue using a suction filter, and rinse with cold water until neutral. After each rinse, drain the residue by gravity, then drain the residue using a suction filter. Dry the glass crucible and residue, cool, and weigh the residue to determine the dry mass. Determine the percentages of pure hemp and viscose in the hemp / viscose blend based on the dry mass of the residue, the mass correction factor for pure hemp, and the pre-set mass of the sample.

[0042] Subsequently, multiple tests were conducted using the quantitative analysis method for hemp / viscose blended products provided by the embodiments of the present invention, yielding multiple sets of different test results. The test results showed that the minimum error between the measured content and the formulated content was 0.12%, while the maximum was 0.77%, with the error ranging from 0.12% to 0.77%.

[0043] In an embodiment of the present invention, samples of pure hemp and pure viscose in a preset mass ratio are dissolved in a formic acid / zinc chloride solution at a preset temperature of (70±2)°C for 13 minutes, and the mass percentages of the pure hemp and the pure viscose in the hemp / viscose blended product are determined based on the dry mass of the dried residue, the mass correction coefficient of the pure hemp, and the preset mass of the sample. This method can be used as a new method for quickly detecting the hemp / viscose content, has a short detection cycle, high accuracy, and can improve the detection efficiency of enterprises.

[0044] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A quantitative analysis method for hemp / viscose blended products, characterized in that: include: The sample is obtained by unraveling pure hemp and pure viscose with preset mass ratios in a hemp / viscose blended product, wherein the preset mass ratios include: 10 / 90, 30 / 70, 50 / 50, 70 / 30 and 90 / 10; The sample was placed in multiple Erlenmeyer flasks filled with a formic acid / zinc chloride solution at a preset temperature of (70±2)°C, and shaken for 13 minutes. The residue was filtered to obtain a residue, wherein 100 mL of the formic acid / zinc chloride solution was added for every gram of the sample; The residue was washed with 10 ml of a 70°C formic acid / zinc chloride solution, and the residue was transferred to a glass crucible with 70°C water. The residue was drained by suction using a suction filter, and then thoroughly washed with 70°C water. The residue was neutralized with 100 ml of a dilute ammonia solution, and the residue was allowed to contact with the dilute ammonia solution for 10 minutes. The residue was drained by suction using the suction filter, and the residue was washed with cold water until neutral to obtain a neutral residue. drying and cooling the neutral residue, and weighing the residue to obtain a dry residue; Determine the mass correction factor for pure cannabis; and The mass percentages of the pure hemp and the pure viscose in the hemp / viscose blended product are determined based on the mass of the dry residue, the mass correction coefficient of the pure hemp, and the mass of the sample.

2. A quantitative analysis method for hemp / viscose blended products, characterized in that: include: The pure hemp and pure viscose with a preset mass ratio in the hemp / viscose blended product are unraveled and mixed to obtain a sample, wherein the mass of the sample is the preset mass; The sample was placed in a conical flask containing a formic acid / zinc chloride solution at a preset temperature of (70±2)°C, and shaken for 13 minutes. The residue was filtered to obtain a residue, wherein 100 mL of the formic acid / zinc chloride solution was added for every gram of the sample; The residue is cleaned, drained, and neutralized to obtain a neutral residue; The neutral residue is dried, cooled, and weighed to obtain the dry mass of the dry residue; The mass percentages of the pure hemp and the pure viscose in the hemp / viscose blended product are determined based on the dry mass of the dry residue, the mass correction coefficient of the pure hemp, and the preset mass of the sample.

3. The quantitative analysis method of hemp / viscose blended products according to claim 2, characterized in that: The preset mass ratios of the pure hemp to the pure viscose include 10 / 90, 30 / 70, 50 / 50, 70 / 30 and 90 / 10.

4. The quantitative analysis method for hemp / viscose blended products according to claim 2, characterized in that: Also includes: Determining the mass correction factor of the pure cannabis, wherein determining the mass correction factor of the pure cannabis specifically includes: The pure cannabis of the initial mass is placed in a formic acid / zinc chloride solution at 70° C. and dissolved for 13 minutes to obtain residual cannabis; The mass correction factor of the pure cannabis is determined based on the mass of the residual cannabis and the initial mass of the pure cannabis.

5. The quantitative analysis method of hemp / viscose blended products according to claim 2, characterized in that: The mass ratio of anhydrous zinc chloride, anhydrous formic acid and water in the formic acid / zinc chloride solution is 20:68:

12.

6. The quantitative analysis method for hemp / viscose blended products according to claim 2, characterized in that: The steps of washing, draining, and neutralizing the residue to obtain a neutral residue specifically include: The residue was washed with 10 ml of 70° C. formic acid / zinc chloride solution, and the entire residue was transferred into a glass sand core crucible with 70° C. water. The residue was suctioned and drained with a suction filtration device, and then thoroughly washed with 70° C. water. The residue was neutralized with 100 mL of dilute ammonia solution, and the residue was allowed to contact with the dilute ammonia solution for 10 minutes. The residue was suctioned and drained with the suction filtration device, and the residue was washed with cold water until neutral to obtain the neutral residue.

7. The quantitative analysis method for hemp / viscose blended products according to claim 6, characterized in that: The dilute ammonia solution is prepared by diluting 20 mL of ammonia water with a density of 0.880 g / mL with water to 1 L.

8. The quantitative analysis method for hemp / viscose blended products according to claim 2, wherein: The mass percentage of the pure cannabis satisfies: Wherein, P is the mass percentage of the pure cannabis, is the dry mass of the dry residue, is the preset mass of the sample, and d is the mass correction coefficient of the cannabis.

9. The quantitative analysis method for hemp / viscose blended products according to claim 8, characterized in that: Its special feature is that The mass correction factor of the pure cannabis is 0.98.

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