CN117867675A - Method for preparing lyocell fiber by regenerating pure cotton textile - Google Patents
Method for preparing lyocell fiber by regenerating pure cotton textile Download PDFInfo
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 131
- 239000004753 textile Substances 0.000 title claims abstract description 91
- 229920000433 Lyocell Polymers 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 13
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 43
- 239000002699 waste material Substances 0.000 claims abstract description 34
- 238000013329 compounding Methods 0.000 claims abstract description 21
- 238000009987 spinning Methods 0.000 claims abstract description 18
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 15
- LFTLOKWAGJYHHR-UHFFFAOYSA-N N-methylmorpholine N-oxide Chemical compound CN1(=O)CCOCC1 LFTLOKWAGJYHHR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 81
- 239000004744 fabric Substances 0.000 claims description 57
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 31
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims description 28
- 238000005406 washing Methods 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000006386 neutralization reaction Methods 0.000 claims description 11
- 238000011069 regeneration method Methods 0.000 claims description 9
- 230000008929 regeneration Effects 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- ZPUUZEFYQOXMEH-UHFFFAOYSA-L [Na+].[Na+].OO.[O-]S(=O)S([O-])=O Chemical compound [Na+].[Na+].OO.[O-]S(=O)S([O-])=O ZPUUZEFYQOXMEH-UHFFFAOYSA-L 0.000 claims description 6
- 239000003086 colorant Substances 0.000 claims description 4
- 238000005554 pickling Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 abstract description 12
- 230000007613 environmental effect Effects 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 238000004042 decolorization Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 2
- QKSIFUGZHOUETI-UHFFFAOYSA-N copper;azane Chemical compound N.N.N.N.[Cu+2] QKSIFUGZHOUETI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 1
- 125000000751 azo group Chemical group [*]N=N[*] 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000000578 dry spinning Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000002166 wet spinning Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention relates to a method for preparing lyocell fibers by regenerating pure cotton textiles, which comprises the following steps: decolorizing the purified cotton textile by adopting a reduction-oxidation method, mincing the decolorized purified cotton textile, compounding according to the polymerization degree to obtain regenerated pulp with the polymerization degree of 350-550, mixing and dissolving the regenerated pulp and the N-methylmorpholine-N-oxide solution to obtain spinning solution, and spinning the spinning solution to obtain the lyocell fiber. The invention decolors the pure cotton textile by a selective reduction-oxidation method, then compounds the minced pure cotton textile according to the polymerization degree, controls the polymerization degree of regenerated pulp to be 350-550, not only can realize the preparation of the lyocell fiber, but also can ensure the whiteness and the fiber strength of the lyocell fiber; meanwhile, the invention can realize the resource utilization of the waste pure cotton textiles, accords with the concept of green, low carbon and environmental protection, and has wide market prospect.
Description
Technical Field
The invention relates to the technical field of textile, in particular to a method for preparing lyocell fibers by regenerating pure cotton textiles.
Background
With the improvement of living standard, the iteration speed of the textile fabric is faster and faster, so that about 2500 ten thousand tons of waste textile fabric is produced annually at present and gradually increases year by year, but the resource recovery is only about 15%, and the problems of great resource waste, environmental pollution and the like are caused, so that the research on the waste textile fabric recovery technology is very important.
In addition, lyocell fibers (Lyocell fibers) are widely used in clothing, home textiles and nonwovens. At present, the original lyocell fiber can be obtained by a preparation method such as dry spinning or wet spinning, the process technology is mature, but the technology for preparing the lyocell fiber by adopting a regeneration method is not mature.
Disclosure of Invention
In view of the above, it is necessary to provide a method for preparing lyocell fibers by regenerating purified cotton textiles, which not only can realize the recycling of waste purified cotton textiles, but also can obtain lyocell fibers with excellent performance.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a method for preparing lyocell fiber by regenerating pure cotton textile, comprising the following steps:
providing a pure cotton textile;
decolorizing the pure cotton fabric by adopting a reduction-oxidation method;
mincing the decolored pure cotton textile, and compounding according to the polymerization degree to obtain regenerated pulp with the polymerization degree of 350-550;
mixing and dissolving the regenerated pulp and an N-methylmorpholine-N-oxide solution to obtain spinning solution;
and spinning the spinning solution to obtain the lyocell fiber.
In one embodiment, the purified cotton fabric is selected from waste purified cotton textiles.
In one embodiment, sodium hydrosulfite-hydrogen peroxide is used as a decoloring system in the step of decoloring the pure cotton fabric by adopting a reduction-oxidation method.
In one embodiment, sodium hydrosulfite-hydrogen peroxide is adopted as a decoloring system to decolor the pure cotton textile, sodium hydroxide, sodium hydrosulfite and water are mixed to prepare a solution, the concentration of sodium hydroxide in the solution is 5g/L-20g/L, the concentration of sodium hydrosulfite is 10g/L-25g/L, then the pure cotton textile is placed in the solution, the pure cotton textile is treated for 30 minutes-60 minutes at 90 ℃ to 100 ℃, the pure cotton textile is taken out and is subjected to acid washing neutralization after the end, then the pure cotton textile is added into 1g/L-10g/L of hydrogen peroxide, the pure cotton textile is treated for 30 minutes-60 minutes at 90 ℃ to 100 ℃, and finally the decolored pure cotton textile is obtained after washing and drying.
In one embodiment, in the step of decolorizing the purified cotton textile by a reduction-oxidation method, at least one of the following conditions is satisfied:
(1) Classifying according to colors;
(2) Detecting the polymerization degree of pulp of the pure cotton textile, selecting the pure cotton textile with the polymerization degree of 300-1100, and classifying according to the polymerization degree ranges of [ 300-500 ], [ 500-700 ], [ 700-900 ]), and [ 900-1100 ], wherein the classification is respectively marked as A class, B class, C class and D class;
(3) Classifying according to the thickness of the fabric, wherein the fabric gram weight is greater than or equal to 200g/m 2 In one class, the gram weight of the cloth is less than 200g/m 2 Are one type.
In one embodiment, when the fabric gram weight is greater than or equal to 200g/m 2 In the step of decoloring treatment, firstly, sodium hydroxide, sodium dithionite and water are mixed to prepare a solution, wherein the concentration of the sodium hydroxide in the solution is 10g/L-20g/L, and the concentration of the sodium hydroxide in the solution is twoThe concentration of sodium sulfite is 15g/L-25g/L, then the pure cotton textile is placed in a solution, treated for 30 minutes-60 minutes at the temperature of 90 ℃ to 100 ℃, the pure cotton textile is taken out after the completion of the treatment and is subjected to acid washing neutralization, then 5g/L-10g/L of hydrogen peroxide is added, the treatment is carried out for 30 minutes-60 minutes at the temperature of 90 ℃ to 100 ℃, and finally the decolorized pure cotton textile is obtained after washing and drying;
when the gram weight of the cloth is less than 200g/m 2 Firstly mixing sodium hydroxide, sodium dithionite and water to prepare a solution, wherein the concentration of sodium hydroxide is 5g/L-15g/L, the concentration of sodium dithionite is 10g/L-20g/L, then placing the purified cotton textile in the solution, treating for 30 minutes-60 minutes at 90-100 ℃, taking out the purified cotton textile after finishing, carrying out acid washing neutralization, then adding the purified cotton textile into 1g/L-8g/L of hydrogen peroxide, treating for 30 minutes-60 minutes at 90-100 ℃, and finally washing and drying to obtain the decolorized purified cotton textile.
In one embodiment, the purified cotton fabric may be sterilized by steam prior to the step of decolorizing the purified cotton fabric by reduction-oxidation.
In one embodiment, at least two of group A, group B, group C and group D are compounded to prepare regenerated pulp having a degree of polymerization of 350-550.
In one embodiment, class A and class C are selected for formulation, and the mass fraction of class A is preferably 70% -95%, and the mass fraction of class C is preferably 5% -30%;
or, selecting A, B and C for compounding, wherein the mass fraction of the A is preferably 80-95%, the mass fraction of the B is preferably 4-15%, and the mass fraction of the C is preferably 1-10%;
or, B and D are selected for compounding, wherein the mass fraction of B is preferably 95-98%, and the mass fraction of D is preferably 2-5%;
or, B, C and D are selected for compounding, wherein the mass fraction of B is preferably 90% -98%, the mass fraction of C is preferably 1% -8%, and the mass fraction of D is preferably 1% -2%.
In one embodiment, in the step of mixing and dissolving the regenerated pulp and the N-methylmorpholine-N-oxide solution to obtain the spinning solution, the mass ratio of the regenerated pulp to the N-methylmorpholine-N-oxide is 0.14:1-0.16:1.
The invention decolors the pure cotton textile by a selective reduction-oxidation method, then compounds the minced pure cotton textile according to the polymerization degree of pulp, controls the polymerization degree of regenerated pulp to be 350-550, not only can realize the preparation of the lyocell fiber, but also can ensure the whiteness and the fiber strength of the lyocell fiber. Meanwhile, the invention can realize the resource utilization of the waste pure cotton textiles, accords with the concept of green, low carbon and environmental protection, and has wide market prospect.
Detailed Description
The present invention will be described in more detail below in order to facilitate understanding of the present invention. It should be understood, however, that the invention may be embodied in many different forms and is not limited to the implementations or embodiments described herein. Rather, these embodiments or examples are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments or examples only and is not intended to be limiting of the invention. As used herein, the optional scope of the term "and/or" includes any one of the two or more related listed items, as well as any and all combinations of related listed items, including any two or more of the related listed items, or all combinations of related listed items.
According to the method for preparing the lyocell fiber by regenerating the pure cotton textile, the pure cotton textile is provided, and the pure cotton textile is further preferably waste pure cotton textile such as waste pure cotton clothes, so that the method can realize the recycling of the waste pure cotton textile, and accords with the ideas of environmental protection, low carbon and environmental protection.
When the pure cotton textile is adopted to regenerate and prepare the lyocell fiber, if the pure cotton textile is inappropriately decolorized, the whiteness of the prepared lyocell fiber can be greatly influenced, and meanwhile, the fiber strength of the prepared lyocell fiber is lower, so that the application of the lyocell fiber in clothing, home textile and non-woven aspects is not facilitated.
Therefore, the invention adopts a reduction-oxidation method to decolorize the pure cotton textile, and optionally adopts sodium hydrosulfite (sodium hydrosulfite) -hydrogen peroxide as a decolorization system, and the decolorization system can decompose azo groups, oxidize amino groups, methylate hydroxyl groups and the like to decolorize the pure cotton textile during the decolorization treatment, and simultaneously the dye chromophore conjugated system is damaged by oxidation, so that the conjugated system loses the conjugated effect, thereby not only achieving the decolorization purpose, but also ensuring whiteness and fiber strength, and particularly ensuring that the whiteness (ISO whiteness) of the fiber can reach more than 68 percent. Meanwhile, the decoloring system has the advantages of small chemical agent dosage, no degradation-resistant chemical agent, high economic benefit, low cost, simple operation and the like, and is suitable for industrial production.
Specifically, sodium hydrosulfite-hydrogen peroxide is adopted as a decoloring system to decolor the pure cotton textile, sodium hydroxide, sodium hydrosulfite and water are mixed to prepare a solution, the concentration of sodium hydroxide in the solution is 5g/L-20g/L, the concentration of sodium hydrosulfite is 10g/L-25g/L, then the pure cotton textile is placed in the solution and is treated for 30 minutes-60 minutes at the temperature of 90 ℃ to 100 ℃, after the completion, the pure cotton textile is taken out and is subjected to pickling neutralization, then the pure cotton textile is added into 1g/L-10g/L of hydrogen peroxide, and is treated for 30 minutes-60 minutes at the temperature of 90 ℃ to 100 ℃, and finally the decolored pure cotton textile is obtained by washing and drying.
The pure cotton textiles are classified according to the colors, the pulp polymerization degree or the fabric gram weight, and then decolorized according to the types, so that the performance of the obtained lyocell fibers is improved.
Wherein, when classifying according to the polymerization degree of pulp, the polymerization degree of pulp of the pure cotton textile is detected by referring to a method for testing FZT50010.3-2011 copper ammonia method, the pure cotton textile with the polymerization degree of pulp of 300-1100 is optimized, and then classified according to the polymerization degree ranges of [ 300-500 ], [ 500-700 ], [ 700-900 ]), and [ 900-1100 ], which are respectively marked as A class, B class, C class and D class.
When classifying according to the thickness of the fabric, the fabric gram weight is greater than or equal to 200g/m 2 In one class, the gram weight of the cloth is less than 200g/m 2 Are one type.
Further, when classifying according to color, pulp polymerization degree or fabric gram weight and then performing the decoloring treatment according to the classification, the decoloring treatment process may be the same or different. Optionally, when the classification decolorization treatment is performed according to the gram weight of the cloth, the concentration of a decolorization system formed by sodium dithionite-hydrogen peroxide can be distinguished, and the decolorization treatment is performed pertinently, so that the effect is better.
The method comprises the following steps: when the gram weight of the cloth is greater than or equal to 200g/m 2 Firstly mixing sodium hydroxide, sodium dithionite and water to prepare a solution, wherein the concentration of the sodium hydroxide is 10g/L-20g/L, the concentration of the sodium dithionite is 15g/L-25g/L, then placing the purified cotton textile in the solution, treating for 30 minutes-60 minutes at 90-100 ℃, taking out the purified cotton textile after finishing, carrying out pickling neutralization, then adding into 5g/L-10g/L of hydrogen peroxide, treating for 30 minutes-60 minutes at 90-100 ℃, and finally washing and drying to obtain the decolorized purified cotton textile.
When the gram weight of the cloth is less than 200g/m 2 In the step of decoloring treatment, firstly, sodium hydroxide, sodium dithionite and water are mixed to prepare a solution, in the solution, the concentration of the sodium hydroxide is 5g/L-15g/L, the concentration of the sodium dithionite is 10g/L-20g/L, then the pure cotton textile is placed in the solution, the pure cotton textile is treated for 30 minutes to 60 minutes at the temperature of 90 ℃ to 100 ℃, after the completion, the pure cotton textile is taken out and is subjected to acid washing neutralization, and then 1g/L-8g/L of sodium dithionite is addedAnd (3) treating in hydrogen peroxide for 30-60 minutes at 90-100 ℃, and finally washing and drying to obtain the decolorized pure cotton textile.
Preferably, the invention classifies according to color, pulp polymerization degree and fabric gram weight, and selects proper decolorizing system concentration and process according to fabric gram weight when performing decolorizing according to the classification.
Optionally, before the step of decolorizing the pure cotton fabric by adopting a reduction-oxidation method, steam may be used to sterilize the pure cotton fabric.
After the decolorization treatment, when the regenerated pulp prepared from the decolorized pure cotton textile is adopted, if the polymerization degree of the regenerated pulp is controlled improperly, the preparation of the lyocell fiber is difficult, or the fiber strength of the prepared lyocell fiber is low, which is not beneficial to the application of the lyocell fiber in clothing, home textile and non-woven aspects.
Therefore, after the decolorized pure cotton textile is obtained, the decolorized pure cotton textile is firstly minced and compounded according to the polymerization degree to obtain the regenerated pulp with the polymerization degree of 350-550, so that the preparation of the lyocell fibers can be realized, and the fiber strength of the lyocell fibers can be ensured.
Optionally, the pulp is divided into A class, B class, C class and D class according to the polymerization degree of [ 300-500 ], [ 500-700 ], [ 700-900 ], [ 900-1100 ] during decolorization, so that at least two of A class, B class, C class and D class are preferably adopted to compound and prepare regenerated pulp with the polymerization degree of 350-550, and further, the A class and the D class are not used simultaneously during preparation, thereby avoiding influencing the usability of the lyocell fiber due to the excessively wide molecular weight.
For example, class a and class C are selected for formulation, and the mass fraction of class a is preferably 70% -95%, and the mass fraction of class C is preferably 5% -30%; or, selecting A, B and C for compounding, wherein the mass fraction of the A is preferably 80-95%, the mass fraction of the B is preferably 4-15%, and the mass fraction of the C is preferably 1-10%; or, B and D are selected for compounding, wherein the mass fraction of B is preferably 95-98%, and the mass fraction of D is preferably 2-5%; or, B, C and D are selected for compounding, wherein the mass fraction of B is preferably 90% -98%, the mass fraction of C is preferably 1% -8%, and the mass fraction of D is preferably 1% -2%.
After the regeneration pulp is compounded, mixing and dissolving the regeneration pulp and an N-methylmorpholine-N-oxide (NMMO) solution to obtain a spinning solution, wherein the mass fraction of the N-methylmorpholine-N-oxide in the N-methylmorpholine-N-oxide solution is preferably 50%, and the mass ratio of the regeneration pulp to the N-methylmorpholine-N-oxide solution is 0.14:1-0.16:1.
And finally, spinning the spinning solution to obtain the lyocell fiber. Specifically, in the spinning step, spinning solution is extruded from a spinneret plate, subjected to primary forming through air bath cooling, then enters a coagulating bath to form primary fibers, and the primary fibers are subjected to winding, bundling and drawing forming, and then undergo the procedures of water washing, oiling, drying and the like to obtain the lyocell fibers, which are not described in detail.
Therefore, the invention decolors the pure cotton textile by a selective reduction-oxidation method, then compounds the minced pure cotton textile according to the polymerization degree of pulp, controls the polymerization degree of regenerated pulp to be 350-550, not only can realize the preparation of the lyocell fiber, but also can ensure the whiteness and the fiber strength of the lyocell fiber. Meanwhile, the invention can realize the resource utilization of the waste pure cotton textiles, accords with the concept of green, low carbon and environmental protection, and has wide market prospect.
Hereinafter, the method for preparing lyocell fibers by regeneration using purified cotton textile will be further described by the following specific examples.
Example 1
Firstly, recycling waste pure cotton clothes, and then classifying according to colors, polymerization degrees and fabric gram weights, wherein the polymerization degrees are detected by referring to a testing method of FZT50010.3-2011 copper ammonia method, and the classification rule of the polymerization degrees is as follows: according to the weight of [ 300-500 ], [ 500-700 ], [ 700-900 ], [ 900-1100 ]]The classification rules of the fabric gram weights are as follows: the gram weight of the cloth is greater than or equal to 200g/m 2 In one class, the gram weight of the cloth is less than 200g/m 2 Are one type.
And then, decoloring the classified waste pure cotton clothes. Wherein the fabric gram weight is greater than or equal to 200g/m 2 The decoloring step of the waste pure cotton clothes is as follows: firstly, mixing sodium hydroxide, sodium dithionite and water to prepare a solution, wherein the concentration of the sodium hydroxide is 15g/L, the concentration of the sodium dithionite is 20g/L, then placing waste pure cotton clothes in the solution, treating for 30 minutes at 100 ℃, taking out the waste pure cotton clothes after finishing, carrying out acid washing neutralization, then adding the waste pure cotton clothes into 10g/L hydrogen peroxide, treating for 45 minutes at 90 ℃, and finally washing and drying the waste pure cotton clothes to obtain decolored waste pure cotton clothes; the gram weight of the cloth is less than 200g/m 2 The decoloring step of the waste pure cotton clothes is as follows: firstly, mixing sodium hydroxide, sodium dithionite and water to prepare a solution, wherein the concentration of the sodium hydroxide is 10g/L, the concentration of the sodium dithionite is 15g/L, then placing the waste pure cotton clothes into the solution, treating for 30 minutes at 100 ℃, taking out the waste pure cotton clothes after finishing, carrying out acid washing neutralization, then adding the waste pure cotton clothes into 6g/L hydrogen peroxide, treating for 45 minutes at 90 ℃, and finally washing and drying the waste pure cotton clothes to obtain the decolored waste pure cotton clothes. After detection, the ISO whiteness of the decolorized waste pure cotton clothes is 68-75%.
And mincing the decolored waste purified cotton clothes to 5cm which is 10cm, and then compounding the A type, the B type and the C type according to the proportion of 80wt%, 15wt% and 5wt% to obtain regenerated pulp with the polymerization degree of 550.
Then, 230g of regenerated pulp is taken, 3kg of N-methylmorpholine-N-oxide solution (the mass fraction is 50%) is added, the mixture is fully swelled and then added into a reaction kettle for dissolution, spinning solution is obtained, silk is extruded from a spinneret plate, the spinning solution is cooled by an air bath for preliminary forming, then the obtained product enters a coagulating bath groove for forming a primary fiber, and the primary fiber is wound, bundled and drawn for forming, and then the lyocell fiber is prepared through the procedures of washing, oiling, drying and the like.
Example 2
Example 2 differs from example 1 only in that: the regenerated pulp with the polymerization degree of 450 is obtained by compounding the A type, the B type and the C type according to the proportion of 90wt percent, 8wt percent and 2wt percent.
Example 3
Example 3 differs from example 1 only in that: the regenerated pulp with the polymerization degree of 450 is obtained by compounding the A type and the B type according to the proportion of 80 weight percent and 20 weight percent.
Example 4
Example 4 differs from example 1 only in that: compounding the A type and the C type according to the proportion of 90wt% and 10wt% to obtain the regenerated pulp with the polymerization degree of 450.
Example 5
Example 5 differs from example 1 only in that: the regenerated pulp with the polymerization degree of 550 is obtained by compounding the B type pulp and the D type pulp according to the proportion of 95 weight percent and 5 weight percent.
Example 6
Example 6 differs from example 1 only in that: the regenerated pulp with the polymerization degree of 550 is obtained by compounding the B type, the C type and the D type according to the proportion of 90wt percent, 5wt percent and 5wt percent.
Example 7
Example 7 differs from example 1 only in that: the gram weight of the cloth is greater than or equal to 200g/m 2 In the solution adopted in the decoloring step of the waste pure cotton clothes, the concentration of sodium hydroxide is 12g/L, the concentration of sodium dithionite is 18g/L, and the concentration of hydrogen peroxide used is 8 g/L; the gram weight of the cloth is less than 200g/m 2 In the solution adopted in the decoloring step of the waste pure cotton clothes, the concentration of sodium hydroxide is 8g/L, the concentration of sodium dithionite is 12g/L, and the concentration of hydrogen peroxide used is 5 g/L. After detection, the ISO whiteness of the decolorized waste pure cotton clothes is 68-75%.
Example 8
Example 8 differs from example 1 only in that: the gram weight of the cloth is greater than or equal to 200g/m 2 In the solution adopted in the decoloring step of the waste pure cotton clothes, the concentration of sodium hydroxide is 18g/L, the concentration of sodium dithionite is 22g/L, and the concentration of hydrogen peroxide used is 8 g/L; the gram weight of the cloth is less than 200g/m 2 Solution adopted in the decoloring step of waste pure cotton clothesWherein the concentration of sodium hydroxide is 12g/L, the concentration of sodium dithionite is 18g/L, and the concentration of hydrogen peroxide is 6 g/L. After detection, the ISO whiteness of the decolorized waste pure cotton clothes is 68-75%.
Comparative example 1
Comparative example 1 differs from example 1 only in that: the regenerated pulp with the polymerization degree of 330 is obtained by compounding the A type, the B type and the C type according to the proportion of 96wt percent, 3wt percent and 1wt percent.
Comparative example 2
Comparative example 2 differs from example 1 only in that: the regenerated pulp with the polymerization degree of 560 is obtained by compounding the A type, the B type and the C type according to the proportion of 50wt percent, 30wt percent and 20wt percent.
The lyocell fibers obtained in examples 1 to 8 and comparative examples 1 to 2 were subjected to performance test with reference to industry standard FZ/T52019 to 2018, and the results are shown in table 1.
TABLE 1
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method for preparing lyocell fibers by regenerating pure cotton textiles, which is characterized by comprising the following steps:
providing a pure cotton textile;
decolorizing the pure cotton fabric by adopting a reduction-oxidation method;
mincing the decolored pure cotton textile, and compounding according to the polymerization degree to obtain regenerated pulp with the polymerization degree of 350-550;
mixing and dissolving the regenerated pulp and an N-methylmorpholine-N-oxide solution to obtain spinning solution;
and spinning the spinning solution to obtain the lyocell fiber.
2. The method for preparing lyocell fibers by regenerating a purified cotton fabric according to claim 1, wherein the purified cotton fabric is selected from the group consisting of waste purified cotton fabrics.
3. The method for preparing lyocell fiber by regenerating pure cotton fabric according to claim 1, wherein sodium hydrosulfite-hydrogen peroxide is used as a decoloring system in the step of decoloring the pure cotton fabric by a reduction-oxidation method.
4. The method for preparing lyocell fiber by regenerating pure cotton fabric according to claim 3, wherein in the step of decoloring the pure cotton fabric by adopting sodium dithionite-hydrogen peroxide as a decoloring system, firstly sodium hydroxide, sodium dithionite and water are mixed to prepare a solution, wherein the concentration of sodium hydroxide is 5g/L-20g/L, the concentration of sodium dithionite is 10g/L-25g/L, then the pure cotton fabric is placed in the solution, the pure cotton fabric is treated for 30 minutes-60 minutes at 90 ℃ to 100 ℃, after the pure cotton fabric is taken out and is subjected to pickling neutralization, then the pure cotton fabric is added into hydrogen peroxide of 1g/L-10g/L, the pure cotton fabric is treated for 30 minutes-60 minutes at 90 ℃ to 100 ℃, and finally the decolored pure cotton fabric is obtained by washing and drying.
5. The method for preparing lyocell fiber by regeneration of pure cotton textile according to claim 4, wherein at least one of the following conditions is satisfied in the step of decolorizing the pure cotton textile by a reduction-oxidation method:
(1) Classifying according to colors;
(2) Detecting the polymerization degree of pulp of the pure cotton textile, selecting the pure cotton textile with the polymerization degree of 300-1100, and classifying according to the polymerization degree ranges of [ 300-500 ], [ 500-700 ], [ 700-900 ]), and [ 900-1100 ], wherein the classification is respectively marked as A class, B class, C class and D class;
(3) Classifying according to the thickness of the fabric, wherein the fabric gram weight is greater than or equal to 200g/m 2 In one class, the gram weight of the cloth is less than 200g/m 2 Are one type.
6. The method for preparing lyocell fibers by regeneration of pure cotton textile according to claim 5, wherein when the gram weight of the fabric is 200g/m or more 2 Firstly mixing sodium hydroxide, sodium dithionite and water to prepare a solution, wherein the concentration of the sodium hydroxide is 10g/L-20g/L, the concentration of the sodium dithionite is 15g/L-25g/L, then placing the purified cotton textile in the solution, treating for 30 minutes-60 minutes at 90-100 ℃, taking out the purified cotton textile after finishing, carrying out pickling neutralization, then adding into 5g/L-10g/L of hydrogen peroxide, treating for 30 minutes-60 minutes at 90-100 ℃, and finally washing and drying to obtain the decolorized purified cotton textile;
when the gram weight of the cloth is less than 200g/m 2 Firstly mixing sodium hydroxide, sodium dithionite and water to prepare a solution, wherein the concentration of sodium hydroxide is 5g/L-15g/L, the concentration of sodium dithionite is 10g/L-20g/L, then placing the purified cotton textile in the solution, treating for 30 minutes-60 minutes at 90-100 ℃, taking out the purified cotton textile after finishing, carrying out acid washing neutralization, then adding the purified cotton textile into 1g/L-8g/L of hydrogen peroxide, treating for 30 minutes-60 minutes at 90-100 ℃, and finally washing and drying to obtain the decolorized purified cotton textile.
7. The method for preparing lyocell fiber by regenerating a purified cotton fabric according to claim 1, wherein the purified cotton fabric is sterilized by steam before the step of decoloring the purified cotton fabric by a reduction-oxidation method.
8. The method for preparing lyocell fiber by regeneration of pure cotton textile according to claim 5, wherein at least two of a class a, a class B, a class C and a class D are used for compounding to prepare regenerated pulp with a polymerization degree of 350-550.
9. The method for preparing lyocell fiber by regeneration of pure cotton textile according to claim 8, wherein the preparation is carried out by selecting class a and class C, wherein the mass fraction of class a is 70% -95%, and the mass fraction of class C is 5% -30%;
or, selecting A class, B class and C class for compounding, wherein the mass fraction of the A class is 80% -95%, the mass fraction of the B class is 4% -15%, and the mass fraction of the C class is 1% -10%;
or, B and D are selected for compounding, wherein the mass fraction of the B is 95-98%, and the mass fraction of the D is 2-5%;
or, B, C and D are selected for compounding, wherein the mass fraction of the B is 90-98%, the mass fraction of the C is 1-8%, and the mass fraction of the D is 1-2%.
10. The method for preparing lyocell fiber by regenerating a pure cotton textile according to claim 1, wherein in the step of mixing and dissolving the regenerated pulp and the N-methylmorpholine-N-oxide solution to obtain a spinning solution, the mass ratio of the regenerated pulp to the N-methylmorpholine-N-oxide is 0.14:1-0.16:1.
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