CN115613157B - Preparation method of high-strength colored artificial cotton based on waste cotton textiles - Google Patents
Preparation method of high-strength colored artificial cotton based on waste cotton textiles Download PDFInfo
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- CN115613157B CN115613157B CN202211327023.4A CN202211327023A CN115613157B CN 115613157 B CN115613157 B CN 115613157B CN 202211327023 A CN202211327023 A CN 202211327023A CN 115613157 B CN115613157 B CN 115613157B
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 96
- 239000002699 waste material Substances 0.000 title claims abstract description 48
- 239000004753 textile Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000835 fiber Substances 0.000 claims abstract description 70
- 229920002635 polyurethane Polymers 0.000 claims abstract description 40
- 239000004814 polyurethane Substances 0.000 claims abstract description 40
- 239000000126 substance Substances 0.000 claims abstract description 33
- 238000009987 spinning Methods 0.000 claims abstract description 28
- 239000004627 regenerated cellulose Substances 0.000 claims abstract description 24
- 238000002166 wet spinning Methods 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000002608 ionic liquid Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N dimethyl sulfoxide Natural products CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 150000007522 mineralic acids Chemical class 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 238000010306 acid treatment Methods 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 230000001112 coagulating effect Effects 0.000 claims 1
- 229920003043 Cellulose fiber Polymers 0.000 abstract description 13
- 230000007547 defect Effects 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 12
- 239000010410 layer Substances 0.000 description 10
- 239000012792 core layer Substances 0.000 description 9
- 238000005303 weighing Methods 0.000 description 8
- 239000004744 fabric Substances 0.000 description 5
- IAZSXUOKBPGUMV-UHFFFAOYSA-N 1-butyl-3-methyl-1,2-dihydroimidazol-1-ium;chloride Chemical compound [Cl-].CCCC[NH+]1CN(C)C=C1 IAZSXUOKBPGUMV-UHFFFAOYSA-N 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000009832 plasma treatment Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/02—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from cellulose, cellulose derivatives, or proteins
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/06—Wet spinning methods
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/16—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds as constituent
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
- D06M10/02—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements ultrasonic or sonic; Corona discharge
- D06M10/025—Corona discharge or low temperature plasma
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/32—Polyesters
Abstract
The invention discloses a preparation method of high-strength colored artificial cotton based on waste cotton textiles, which comprises the following steps: after the polymerization degree of colored waste cotton fibers is reduced, washing, drying and fully dissolving in ionic liquid to obtain regenerated cellulose solution; fully stirring the regenerated cellulose solution and the low-concentration polyurethane solution, and uniformly mixing to obtain regenerated cellulose-polyurethane spinning solution; pretreating chemical fibers to make the chemical fibers serve as core yarns, and coating the surface of the chemical fibers with regenerated cellulose-polyurethane spinning solution through wet spinning to obtain colored nascent artificial cotton; the colored artificial cotton with corresponding color is obtained after the ionic liquid remained in the primary artificial cotton is removed, the mechanical property of the surface cellulose fiber is improved, the defect that the cellulose fiber is strong in brittleness and difficult to weave is overcome, the stress of the fiber is basically consistent with that of the inner-layer chemical fiber, and the fracture layering phenomenon caused by different strains of the inner layer and the outer layer is improved.
Description
Technical Field
The invention relates to the field of colored waste cotton textiles, in particular to a preparation method of high-strength colored artificial cotton based on waste cotton textiles.
Background
With the increasing demands of people, the demand of textile raw materials is greatly increased, and the quantity of colored waste textiles is also sharply increased. In many different colored waste textiles, the proportion of the waste cotton textiles is large, the waste cotton textiles not only can pollute the dyeing process, but also can cause secondary pollution to the environment in the recycling process due to the relatively complex components in the dye. Therefore, the method improves the recycling of the waste colored cotton textiles, and has great significance for recycling biomass recyclable resources and protecting the environment.
In patent document 2021109080270, the secondary recovery and reutilization of the waste fibers are realized by the prepared colored regenerated cellulose fibers through wet spinning after the regenerated fibers are obtained by dissolving the waste fibers by using an ionic liquid. However, regenerated cellulose fibers have the disadvantage of low strength and high initial modulus, which results in poor fiber comfort, and are not satisfactory for weaving and comfort. Meanwhile, the cotton-like manufacturing technology at the present stage can not solve the problems that the moisture absorption and the moisture regain of the polyester fiber are improved, the quality is not stable enough, good dyeing property, color fastness and the like can not be achieved, and the level of the natural cotton fiber can not be reached.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a preparation method of high-strength colored artificial cotton based on waste cotton textiles.
In order to achieve the above purpose, the invention adopts the following technical scheme: the preparation method of the high-strength colored artificial cotton based on the waste cotton textile is characterized by comprising the following steps of: s1: after the polymerization degree of colored waste cotton fibers is reduced, washing, drying and fully dissolving in ionic liquid to obtain regenerated cellulose solution; s2: fully stirring the regenerated cellulose solution and the low-concentration polyurethane solution, and uniformly mixing to obtain regenerated cellulose-polyurethane spinning solution; s3: pretreating chemical fibers to make the chemical fibers serve as core yarns, and coating the surface of the chemical fibers with regenerated cellulose-polyurethane spinning solution through wet spinning to obtain colored nascent artificial cotton; s4: and removing the residual ionic liquid of the primary artificial cotton to obtain the color artificial cotton with the corresponding color.
In a preferred embodiment of the invention, the colored waste cotton fibers are treated with dilute mineral acid to reduce the degree of polymerization.
In a preferred embodiment of the present invention, the dilute mineral acid is sulfuric acid, hydrochloric acid or nitric acid.
In a preferred embodiment of the present invention, the dilute mineral acid treatment conditions are: treating in water bath at 50-90 deg.c in inorganic acid in 0.1-1 wt% concentration for 0.5-3 hr.
In a preferred embodiment of the present invention, the preparation conditions of the low concentration polyurethane solution are: the polyurethane is dissolved in an oil bath environment at 70-100 ℃ for 6-12 h to obtain polyurethane solution with the concentration of 3-8 wt%.
In a preferred embodiment of the present invention, the organic solvent that dissolves the polyurethane is dimethyl sulfoxide.
In a preferred embodiment of the present invention, in step S2, the ratio of regenerated cellulose solution to polyurethane solution is 1:0.2 to 1: and 0.8, treating for 3-6 hours by adopting a water bath heating and stirring mode to obtain the regenerated cellulose-polyurethane spinning solution.
In a preferred embodiment of the present invention, in step S3, the pretreatment mode of the chemical fiber is plasma surface modification.
In a preferred embodiment of the present invention, in step S3, the coagulation bath for wet spinning is deionized water at 25 to 70 ℃.
In a preferred embodiment of the present invention, in step S1, the fiber is washed, dried, frozen by liquid nitrogen, ground into powder, and then dissolved.
The invention solves the defects existing in the background technology, and has the following beneficial effects:
(1) In order to further achieve the level of natural cotton fibers, the invention adopts hollow chemical fibers as a core layer to increase the warmth retention property, simultaneously adds substances with high elastic properties into regenerated cellulose fibers, coats the surfaces of the regenerated cellulose fibers, and has the strength reaching 3.3cN/dtex, which is obviously enhanced compared with the common 1.8-2.9 cN/dtex of the natural cotton fibers, thereby having important significance for the preparation and development of novel fibers combining chemical fibers and natural fibers.
(2) The invention uses colored waste cotton textiles for recovery treatment, the raw materials are easy to obtain, the preparation method is simple, and the mechanical properties of the colored waste cotton textiles are enhanced while the primary colors of the colored waste cotton textiles are reserved. The defect of strong brittleness of cellulose fibers is overcome, pollution caused by bleaching and other processes in the traditional process of treating colored waste cotton textiles is avoided, the weavability is realized, the cost is saved, and meanwhile, the green recovery is realized.
(3) According to the invention, chemical fibers and cellulose fibers are combined through wet spinning for the first time, and meanwhile, the problems of poor comfort level of the chemical fibers, low strength of natural fibers and short service life are solved. The advantages of high strength and high modulus of the chemical fiber and good comfort of the cellulose fiber are absorbed and maintained, the disadvantages of the chemical fiber and the cellulose fiber are avoided and overcome, and the production of the novel fiber with multiple advantages and few disadvantages is realized.
(4) Compared with the existing regenerated cellulose, the mechanical property of the surface cellulose fiber is improved, the defect that the cellulose fiber is strong in brittleness and difficult to weave is overcome, the stress of the surface cellulose fiber is basically consistent with that of the inner-layer chemical fiber, the fracture layering phenomenon caused by different strains of the inner layer and the outer layer is improved, and the industrialized development of novel fibers is promoted.
(5) The method adopts the chemical fiber with a hollow structure as a core layer, and the regenerated cellulose solution is coated on the surface of the chemical fiber after being improved. The cotton-like fabric has good warmth retention performance similar to the natural cotton fiber structure, and simultaneously has good surface layer hygroscopicity and moisture regain, so that the condition that the chemical fiber spun cotton is poor in moisture absorption at the present stage is improved, and the functional imitation cotton in the true sense is realized.
(6) The color artificial cotton prepared by the method has the breaking strength of 3.31cN/dtex, the breaking elongation of 73.96 percent and the initial modulus of 103cN/dtex, and the textile woven by the artificial cotton has excellent mechanical property and higher comfort level, and can be widely applied to the intelligent wearable field.
Drawings
FIG. 1 is a perspective view of a preferred embodiment of the present invention;
FIG. 2 is a spinning schematic of a preferred embodiment of the invention;
FIG. 3 is a Fourier infrared plot of a preferred embodiment of the invention versus comparative example 1;
in the figure: 1. hollow chemical fiber; 2. color regenerated fiber; 3. spinning solution; 4. hollow chemical fiber; 5. a coaxial spinneret; 6. a first roller; 7. a second roller; 8. and (3) winding the roller.
Detailed Description
Reference to "an embodiment," "one embodiment," or "other embodiments" means that a particular feature or characteristic described in connection with the embodiment is included in at least some embodiments, but not necessarily all embodiments, in a clear and complete description of embodiments of the invention, taken in conjunction with the accompanying drawings in embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following examples, the strength and elongation at break of the artificial cotton were tested by stretching with a single fiber power machine, a YG001D electronic single fiber power machine, a gauge of 20mm, and a stretching speed of 10mm/min, as shown in FIG. 1 and FIG. 2.
Example 1
1) Recovering red waste pure cotton textiles, and opening the waste cotton cloth by adopting a multifunctional fine shuttle opener to obtain waste cotton fibers;
2) Adding 2g of waste cotton fibers into 200ml of 0.5wt% dilute sulfuric acid, heating to 75 ℃ in a water bath kettle, keeping for 2 hours, washing to be neutral by deionized water, and drying in an oven at 50 ℃ for later use;
3) Freezing the fiber obtained in the step 2) by liquid nitrogen, immediately putting the fiber into a Raymond mill, and grinding the fiber into powder;
4) Weighing 3g of 1-butyl-3-methylimidazole chloride, putting into a sealed bottle, and heating in an oil bath pot at 90 ℃ until the mixture is transparent; weighing 0.2g of the powder obtained in the step 3), placing the powder into a sealed bottle, heating and stirring at 90 ℃ until the fibers are completely dissolved, and obtaining regenerated cellulose solution;
5) 0.5g of polyurethane was weighed and placed in 10g of dimethyl sulfoxide solution, and dissolved in an environment of 90℃for 6 hours to obtain a polyurethane solution having a concentration of 5% by weight.
6) Mixing the regenerated cellulose solution obtained in the step 4) with the low-concentration polyurethane solution obtained in the step 5) in a ratio of 1:0.3, and treating for 6 hours by adopting a water bath heating and stirring mode to obtain the regenerated cellulose-polyurethane spinning solution.
7) Carrying out plasma surface modification on the hollow polyester fiber, wherein the experimental conditions are as follows: the gas pressure was 2000Pa, the dielectric barrier discharge power was 150W, and plasma treatment was performed for 180s.
8) The regenerated cellulose-polyurethane spinning solution obtained in the step 6) is subjected to defoaming treatment, is placed in a 20ml medical injector, is then connected with a spinning needle, takes the chemical fiber obtained in the step 7) as a core yarn, is placed in a coaxial needle tube core layer, connects the spinning solution obtained in the step 6) with the outer layer of a coaxial needle tube, and carries out wet spinning in a wet spinning device, wherein the advancing speed of the spinning solution is 70ml/h, the speed of a roller I is 20mm/s, the speed ratio of a roller II to a roller I is 1.5:1, and the receiving mode is roller receiving, so that the primary artificial cotton is obtained.
9) And (3) soaking the primary artificial cotton obtained in the step (8) in deionized water to remove residual ionic liquid, thereby obtaining the color artificial cotton with corresponding color.
The surface of the red artificial cotton fiber prepared in the embodiment 1 is in a groove shape along the longitudinal direction, which is a typical structural characteristic of fibers prepared by wet spinning, and shows that the artificial cotton prepared by the invention is better in molding; the cross section of the regenerated cellulose conductive filament is of a coaxial structure, the structure is compact, no obvious defect hole exists in the regenerated cellulose conductive filament, and the preparation process is excellent, and the prepared artificial cotton is good in structure.
Comparative example 1
Comparative example 1 differs from example 1 in that: polyurethane is not added into the spinning solution, and the method specifically comprises the following steps:
1) Recovering red waste pure cotton textiles, and opening the waste cotton cloth by adopting a multifunctional fine shuttle opener to obtain waste cotton fibers;
2) Adding 2g of waste cotton fibers into 200ml of 0.5wt% dilute sulfuric acid, heating to 75 ℃ in a water bath kettle, keeping for 2 hours, washing to be neutral by deionized water, and drying in an oven at 50 ℃ for later use;
3) Freezing the fiber obtained in the step 2) by liquid nitrogen, immediately putting the fiber into a Raymond mill, and grinding the fiber into powder;
4) Weighing 3g of 1-butyl-3-methylimidazole chloride, putting into a sealed bottle, and heating in an oil bath pot at 90 ℃ until the mixture is transparent; weighing 0.2g of the powder obtained in the step 3), placing the powder into a sealed bottle, heating and stirring at 90 ℃ until the fibers are completely dissolved, and obtaining regenerated cellulose solution;
5) Carrying out plasma surface modification on the hollow polyester fiber, wherein the experimental conditions are as follows: the gas pressure was 2000Pa, the dielectric barrier discharge power was 150W, and plasma treatment was performed for 180s.
6) The regenerated cellulose-polyurethane spinning solution obtained in the step 4) is subjected to defoaming treatment, is placed in a 20ml medical injector, is then connected with a spinning needle, takes the chemical fiber obtained in the step 5) as a core yarn, is placed in a coaxial needle core layer, connects the spinning solution obtained in the step 4) with the outer layer of a coaxial needle tube, and carries out wet spinning in a wet spinning device, wherein the advancing speed of the spinning solution is 70ml/h, the speed of a roller I is 20mm/s, the speed ratio of a roller II to a roller I is 1.5:1, and the receiving mode is roller receiving, so that the primary artificial cotton is obtained.
9) And (3) soaking the primary artificial cotton obtained in the step (8) in deionized water to remove residual ionic liquid, thereby obtaining the color artificial cotton with corresponding color.
| Examples | Strong/(cN/dtex) | Elongation at break/% | Initial modulus/(cN/dtex) |
| Example 1 | 3.31 | 73.96 | 127 |
| Comparative example 1 | 2.90 | 48.04 | 93 |
TABLE 1
As can be seen from Table 1 and FIG. 3, the addition of polyurethane in example 1 can enhance the mechanical properties of the surface layer of the artificial cotton, and simultaneously reduce the initial modulus, so that the brittleness of the fiber is reduced, the layering phenomenon of the inner layer and the outer layer caused by different strains is improved, and good weaving conditions are provided for the artificial cotton.
Comparative example 2
Comparative example 2 differs from example 1 in that: the core layer chemical fiber is not subjected to surface modification treatment, and specifically comprises the following steps:
1) Recovering red waste pure cotton textiles, and opening the waste cotton cloth by adopting a multifunctional fine shuttle opener to obtain waste cotton fibers;
2) Adding 2g of waste cotton fibers into 200ml of 0.5wt% dilute sulfuric acid, heating to 75 ℃ in a water bath kettle, keeping for 2 hours, washing to be neutral by deionized water, and drying in an oven at 50 ℃ for later use;
3) Freezing the fiber obtained in the step 2) by liquid nitrogen, immediately putting the fiber into a Raymond mill, and grinding the fiber into powder;
4) Weighing 3g of 1-butyl-3-methylimidazole chloride, putting into a sealed bottle, and heating in an oil bath pot at 90 ℃ until the mixture is transparent; weighing 0.2g of the powder obtained in the step 3), placing the powder into a sealed bottle, heating and stirring at 90 ℃ until the fibers are completely dissolved, and obtaining regenerated cellulose solution;
5) 0.5g of polyurethane was weighed and placed in 10g of dimethyl sulfoxide solution, and dissolved in an environment of 90℃for 6 hours to obtain a polyurethane solution having a concentration of 5% by weight.
6) Mixing the regenerated cellulose solution obtained in the step 4) with the low-concentration polyurethane solution obtained in the step 5) in a ratio of 1:0.3, and treating for 6 hours by adopting a water bath heating and stirring mode to obtain the regenerated cellulose-polyurethane spinning solution.
7) The regenerated cellulose-polyurethane spinning solution obtained in the step 6) is subjected to defoaming treatment, is placed in a 20ml medical injector, is then connected with a spinning needle head, takes chemical fibers as core yarns, is placed in a coaxial needle tube core layer, is connected with the outer layer of a coaxial needle tube, is subjected to wet spinning in a wet spinning device, and has the advancing speed of 70ml/h, the speed of a roller I is 20mm/s, the speed ratio of the roller II to the roller I is 1.5:1, and the receiving mode is roller receiving, so that the primary artificial cotton is obtained.
8) And 7) soaking the primary artificial cotton obtained in the step 7) in deionized water to remove residual ionic liquid, thereby obtaining the color artificial cotton with corresponding color.
| Examples | Strong/(cN/dtex) | Elongation at break/% |
| Example 1 | 3.31 | 73.96 |
| Comparative example 2 | 3.15 | 52.07 |
TABLE 2
As can be seen from table 1, compared with comparative example 2, in example 1, the chemical fiber surface is modified to enhance the interface bonding between the surface layer and the core layer, weaken the delamination phenomenon when the inner and outer layers are stretched and broken, and effectively improve the mechanical properties of the artificial cotton.
Comparative example 3
Comparative example 3 differs from example 1 in that: the core layer chemical fiber adopts a non-hollow structure, and specifically comprises the following components: 1) Recovering red waste pure cotton textiles, and opening the waste cotton cloth by adopting a multifunctional fine shuttle opener to obtain waste cotton fibers;
2) Adding 2g of waste cotton fibers into 200ml of 0.5wt% dilute sulfuric acid, heating to 75 ℃ in a water bath kettle, keeping for 2 hours, washing to be neutral by deionized water, and drying in an oven at 50 ℃ for later use;
3) Freezing the fiber obtained in the step 2) by liquid nitrogen, immediately putting the fiber into a Raymond mill, and grinding the fiber into powder;
4) Weighing 3g of 1-butyl-3-methylimidazole chloride, putting into a sealed bottle, and heating in an oil bath pot at 90 ℃ until the mixture is transparent; weighing 0.2g of the powder obtained in the step 3), placing the powder into a sealed bottle, heating and stirring at 90 ℃ until the fibers are completely dissolved, and obtaining regenerated cellulose solution;
5) 0.5g of polyurethane was weighed and placed in 10g of dimethyl sulfoxide solution, and dissolved in an environment of 90℃for 6 hours to obtain a polyurethane solution having a concentration of 5% by weight.
6) Mixing the regenerated cellulose solution obtained in the step 4) with the low-concentration polyurethane solution obtained in the step 5) in a ratio of 1:0.3, and treating for 6 hours by adopting a water bath heating and stirring mode to obtain the regenerated cellulose-polyurethane spinning solution.
7) Plasma surface modification is carried out on polyester fiber (not hollow), and experimental conditions are as follows: the gas pressure was 2000Pa, the dielectric barrier discharge power was 150W, and plasma treatment was performed for 180s.
8) The regenerated cellulose-polyurethane spinning solution obtained in the step 6) is subjected to defoaming treatment, is placed in a 20ml medical injector, is then connected with a spinning needle, takes the chemical fiber obtained in the step 7) as a core yarn, is placed in a coaxial needle tube core layer, connects the spinning solution obtained in the step 6) with the outer layer of a coaxial needle tube, and carries out wet spinning in a wet spinning device, wherein the advancing speed of the spinning solution is 70ml/h, the speed of a roller I is 20mm/s, the speed ratio of a roller II to a roller I is 1.5:1, and the receiving mode is roller receiving, so that the primary artificial cotton is obtained.
9) And (3) soaking the primary artificial cotton obtained in the step (8) in deionized water to remove residual ionic liquid, thereby obtaining the color artificial cotton with corresponding color.
| Examples | Strong/(cN/dtex) | Elongation at break/% |
| Example 1 | 3.31 | 73.96 |
| Comparative example 3 | 3.26 | 67.07 |
TABLE 3 Table 3
As can be seen from table 1, in example 1, compared with comparative example 3, the chemical fiber with hollow structure can realize structural and functional cotton imitation without changing mechanical properties.
The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the person skilled in the art without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (9)
1. The preparation method of the high-strength colored artificial cotton based on the waste cotton textile is characterized by comprising the following steps of:
s1: after the polymerization degree of colored waste cotton fibers is reduced, washing, drying and fully dissolving in ionic liquid to obtain regenerated cellulose solution;
s2: fully stirring the regenerated cellulose solution and the low-concentration polyurethane solution, and uniformly mixing to obtain regenerated cellulose-polyurethane spinning solution;
s3: pretreating chemical fiber with a hollow structure to make the chemical fiber be used as a core yarn, and coating the surface of the chemical fiber with regenerated cellulose-polyurethane spinning solution through wet spinning to obtain colored nascent artificial cotton;
s4: removing the residual ionic liquid of the primary artificial cotton to obtain colored artificial cotton with corresponding color;
the concentration of the low-concentration polyurethane solution is 3-8wt%;
in the step S2, the proportion of the regenerated cellulose solution to the polyurethane solution is 1:0.2 to 1:0.8;
in the step S1, after the fiber is washed and dried, the fiber is frozen by liquid nitrogen and ground into powder, and then is dissolved.
2. The method for preparing high-strength colored artificial cotton based on waste cotton textiles according to claim 1, which is characterized in that: the colored waste cotton fibers are treated by dilute inorganic acid to reduce the polymerization degree.
3. The method for preparing high-strength colored artificial cotton based on waste cotton textiles according to claim 2, which is characterized in that: the dilute mineral acid is sulfuric acid, hydrochloric acid or nitric acid.
4. The method for preparing high-strength colored artificial cotton based on waste cotton textiles according to claim 2, which is characterized in that: the dilute mineral acid treatment conditions are as follows: treating in water bath at 50-90 deg.c in inorganic acid in 0.1-1 wt% concentration for 0.5-3 hr.
5. The method for preparing high-strength colored artificial cotton based on waste cotton textiles according to claim 1, which is characterized in that: the preparation conditions of the low-concentration polyurethane solution are as follows: the polyurethane is dissolved in an oil bath environment at 70-100 ℃ for 6-12 h.
6. The method for preparing high-strength colored artificial cotton based on waste cotton textiles according to claim 5, which is characterized in that: the organic solvent for dissolving polyurethane is dimethyl sulfoxide.
7. The method for preparing high-strength colored artificial cotton based on waste cotton textiles according to claim 1, which is characterized in that: in the step S2, the regenerated cellulose solution and the polyurethane solution are treated for 3-6 hours by adopting a water bath heating and stirring mode, and the regenerated cellulose-polyurethane spinning solution is obtained.
8. The method for preparing high-strength colored artificial cotton based on waste cotton textiles according to claim 1, which is characterized in that: in step S3, the pretreatment mode of the chemical fiber adopts plasma surface modification.
9. The method for preparing high-strength colored artificial cotton based on waste cotton textiles according to claim 1, which is characterized in that: in the step S3, the coagulating bath of the wet spinning is deionized water at 25-70 ℃.
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| JP2009287125A (en) * | 2008-05-27 | 2009-12-10 | Toray Opelontex Co Ltd | Polyurethane elastic fiber |
| CN102517689A (en) * | 2011-12-02 | 2012-06-27 | 华南理工大学 | Lignin base skin core structure nanometer/micron fiber and preparation method thereof |
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