CN116926716A - Regenerated fiber - Google Patents
Regenerated fiber Download PDFInfo
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- CN116926716A CN116926716A CN202210365748.6A CN202210365748A CN116926716A CN 116926716 A CN116926716 A CN 116926716A CN 202210365748 A CN202210365748 A CN 202210365748A CN 116926716 A CN116926716 A CN 116926716A
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- Prior art keywords
- polyester
- recycled
- polyester pellets
- pellets
- weight
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- 239000000835 fiber Substances 0.000 title claims abstract description 58
- 229920000728 polyester Polymers 0.000 claims abstract description 218
- 239000008188 pellet Substances 0.000 claims abstract description 134
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000004970 Chain extender Substances 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 12
- 230000001172 regenerating effect Effects 0.000 claims 1
- 239000004753 textile Substances 0.000 abstract description 23
- 238000004043 dyeing Methods 0.000 abstract description 12
- 238000011156 evaluation Methods 0.000 description 23
- 238000006116 polymerization reaction Methods 0.000 description 14
- 239000007787 solid Substances 0.000 description 13
- -1 polyethylene terephthalate Polymers 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 230000007613 environmental effect Effects 0.000 description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 description 7
- 239000005020 polyethylene terephthalate Substances 0.000 description 7
- 238000002074 melt spinning Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004898 kneading Methods 0.000 description 5
- 229920001707 polybutylene terephthalate Polymers 0.000 description 5
- 238000009987 spinning Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000005469 granulation Methods 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012360 testing method 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
- D01F8/04—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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Polyesters Or Polycarbonates (AREA)
- Artificial Filaments (AREA)
Abstract
A recycled fiber prepared from a material comprising: virgin polyester pellets and recycled polyester pellets. The ratio of the intrinsic viscosity of the recycled polyester pellets to the intrinsic viscosity of the virgin polyester pellets is between 0.89 and 1.13. Regenerated textiles made with the regenerated fibers of the present disclosure are free from cross-bar problems after dyeing.
Description
Technical Field
The present disclosure relates to an environment-friendly textile material, and more particularly, to a regenerated fiber.
Background
In recent years, as the consumption of textiles increases, the amount of waste textiles increases. In this regard, industry has begun to develop fibers with high added value and high environmental protection by recycling waste textiles. However, regenerated fibers made from waste textiles often have serious effects on their spinnability due to the presence of dyes, impurities, etc. therein, resulting in subsequently produced regenerated textiles having quality or appearance imperfections (e.g., cross bar problems of the textiles). Therefore, how to provide a regenerated fiber with high environmental protection and good spinning performance is an important subject for the active research of textile industry.
Disclosure of Invention
The present disclosure provides a regenerated fiber, which can be used to prepare regenerated textiles without the problem of cross-bar after dyeing.
According to some embodiments of the present disclosure, a recycled fiber is prepared from a material comprising: virgin polyester pellets and recycled polyester pellets. The ratio of the intrinsic viscosity (Intrinsic Viscosity) of the recycled polyester pellets to the intrinsic viscosity of the virgin polyester pellets is between 0.89 and 1.13.
In some embodiments of the present disclosure, the weight ratio of virgin polyester pellets to recycled polyester pellets is between 1:1 to 8: 2.
In some embodiments of the present disclosure, the weight average molecular weight of the polyester in the virgin polyester pellets is between 30000g/mol and 40000g/mol, and the weight average molecular weight of the polyester in the recycled polyester pellets is between 30000g/mol and 48000 g/mol.
In some embodiments of the present disclosure, the weight average molecular weight of the polyester in the virgin polyester pellets is between 30000g/mol and 40000g/mol, and the weight average molecular weight of the polyester in the recycled polyester pellets is between 47000g/mol and 48000 g/mol.
In some embodiments of the present disclosure, the recycled polyester pellets are prepared from a material comprising: recycled polyesters and chain extended polyesters. The chain extended polyester comprises 90 to 98 parts by weight virgin polyester and 2 to 10 parts by weight of a chain extender.
In some embodiments of the present disclosure, the recycled polyester is present in an amount of between 98 parts by weight and 99 parts by weight, and the chain extended polyester is present in an amount of between 1 parts by weight and 2 parts by weight.
In some embodiments of the present disclosure, the chain extender comprises a structure as shown in formula (1):wherein n is a positive integer between 1 and 3, and m is a positive integer between 1 and 3.
In some embodiments of the present disclosure, the chain extender is present in an amount between 1000ppm and 2000ppm based on the total weight of the recycled polyester pellets.
In some embodiments of the present disclosure, the chain extender comprises a structure as shown in formula (2):
in some embodiments of the present disclosure, the chain extender is present in an amount between 150ppm and 500ppm based on the total weight of the recycled polyester pellets.
According to the above embodiments of the present disclosure, the recycled fibers of the present disclosure are prepared from a material comprising virgin polyester pellets and recycled polyester pellets. By controlling the intrinsic viscosity of the virgin polyester pellets and the ratio (proportion) of the intrinsic viscosity of the recycled polyester pellets, the recycled textile made of recycled fibers can be free from the problem of cross-bars after dyeing.
Detailed Description
Various embodiments of the present disclosure will be described in detail below, and for purposes of clarity, numerous practical details are set forth in the following description. However, it should be understood that these practical details are not to be used to limit the present disclosure. That is, in some embodiments of the present disclosure, these practical details are not necessary and therefore should not be used to limit the present disclosure.
In the present disclosure, the structure of a polymer or group is sometimes referred to as a bond wire (formula). This representation may omit carbon atoms, hydrogen atoms, and carbon-hydrogen bonds. Of course, the structural formula has atoms or atomic groups explicitly drawn, and the drawing is in control.
The present disclosure provides a recycled fiber prepared from a material comprising virgin polyester pellets and recycled polyester pellets. By controlling the intrinsic viscosity (Intrinsic Viscosity) of the virgin polyester pellets and the ratio (proportion) of the intrinsic viscosity of the recycled polyester pellets, the recycled textile made from recycled fibers can be protected from the cross-bar problem after dyeing.
The recycled fibers of the present disclosure are prepared from materials comprising virgin polyester pellets and recycled polyester pellets, and the ratio of the intrinsic viscosity of the recycled polyester pellets to the intrinsic viscosity of the virgin polyester pellets is between 0.89 and 1.13. When the ratio of the intrinsic viscosity of the reclaimed polyester particles to the intrinsic viscosity of the virgin polyester particles falls within the above range, the reclaimed polyester particles and the virgin polyester particles may have similar physical properties (e.g., heat resistance, spinning property, etc.), thereby giving the reclaimed polyester particles similar melt-spinning stability to the virgin polyester particles. In this way, the regenerated fiber formed by co-spinning the regenerated polyester particles and the virgin polyester particles can avoid the problem of the cross bars after being manufactured into the regenerated textile and dyed. In some embodiments, the intrinsic viscosity of the virgin polyester pellets may be, for example, 0.64, and the intrinsic viscosity of the recycled polyester pellets may be, for example, between 0.57 and 0.72.
Further supplementing the measurement of the intrinsic viscosity of the polyester pellets of the present disclosure. The method for measuring the intrinsic viscosity of the polyester pellets includes steps S10 to S40. In step S10, 0.125g of the polyester pellets were placed in 25ml of a phenol-tetrachloroethane mixed solvent and heated at 120℃for about two hours until the polyester pellets were completely dissolved, and cooled to form a solution to be measured. In step S20, the solution to be measured is poured into a viscometer (model: dynamic viscosity tester SCHOTT CT 52) and left to stand for 20 minutes in a constant temperature water tank at 25.+ -. 0.05 ℃ and then the time required from the upper scale to the lower scale in the viscometer is measured (T1). In step S30, another 25ml of the phenol-tetrachloroethane mixture was poured into a viscometer (model: dynamic viscosity tester SCHOTT CT 52) and allowed to stand for 20 minutes in a constant temperature water tank at 25.+ -. 0.05 ℃ and then the time (T2) required from the upper scale to the lower scale in the viscometer was measured. In step S40, the ratio of time T1 to time T2 is calculated to obtain the relative viscosity of the polyester pellets (Relative Viscosity), and the intrinsic viscosity of the polyester pellets is calculated using a correlation formula.
In some embodiments, the weight ratio of virgin polyester pellets to recycled polyester pellets may be between 1:1 to 8:2 to contribute to a high environmental protection (e.g., a high degree of recycling) of the regenerated fiber and to a high spinning process stability of the material used to form the regenerated fiber. In detail, when the weight ratio of the content of virgin polyester pellets to the content of recycled polyester pellets is less than 1:1 (e.g., 4: 6), the material used to form the regenerated fiber has a greater chance of breaking during the false twisting process; when the weight ratio of the content of virgin polyester pellets to the content of recycled polyester pellets is greater than 8:2 (e.g., 9:1), which represents a low level of recycled raw material in the recycled fiber, may be more difficult to meet the expectations and requirements of environmental textiles on the market. In a preferred embodiment, the weight ratio of the content of virgin polyester pellets to the content of recycled polyester pellets may be, for example, 7:3, the environmental protection of the regenerated fiber and the spinning processing stability of the material used for forming the regenerated fiber are both considered.
In some embodiments, the recycled polyester pellets and virgin polyester pellets can have similar intrinsic viscosities by adjusting the weight average molecular weight of the polyester in the virgin polyester pellets and the weight average molecular weight of the polyester in the recycled polyester pellets. In some embodiments, the weight average molecular weight of the polyester in the virgin polyester pellets may be between 30000g/mol and 40000g/mol, and the weight average molecular weight of the polyester in the recycled polyester pellets is between 30000g/mol and 48000 g/mol. In detail, when the weight average molecular weight of the polyester in the virgin polyester pellets and the weight average molecular weight of the polyester in the recycled polyester pellets each fall within the above-mentioned ranges, it is possible to contribute to the ratio of the intrinsic viscosity of the recycled polyester pellets to the intrinsic viscosity of the virgin polyester pellets being close to 0.89 to 1.13, thereby providing the recycled polyester pellets with similar melt spinning stability to the virgin polyester pellets. In other embodiments, the recycled polyester pellets may be prepared by lower cost solid state polymerization, and in such embodiments the weight average molecular weight of the polyester in the recycled polyester pellets may be between 47000g/mol and 48000 g/mol. It should be noted that, although the weight average molecular weight of the polyester in the recycled polyester pellets formed by solid state polymerization is larger and more different from the weight average molecular weight of the polyester in the virgin polyester pellets than in the embodiment without solid state polymerization, the ratio of the intrinsic viscosity of the recycled polyester pellets to the intrinsic viscosity of the virgin polyester pellets can fall within the range of 0.89 to 1.13, and the process temperature of solid state polymerization is low and the molecular weight of the recycled polyester can be increased compared with the general polymerization, thereby effectively saving the cost and having the advantage of mass production.
In some embodiments, the temperature of the solid state polymerization may be between 200 ℃ and 240 ℃, the time of the solid state polymerization may be between 6 hours and 10 hours, the vacuum of the solid state polymerization may be between 0.1 torr and 1 torr, and the agitation speed of the solid state polymerization may be between 50rpm and 70 rpm. In some embodiments, the polyester in the virgin polyester pellets may be, for example, polyethylene terephthalate, and the polyester in the recycled polyester pellets may be, for example, polyethylene terephthalate, polybutylene terephthalate, or a combination thereof.
The regenerated polyester pellets will be further described. In some embodiments, the recycled polyester pellets can be prepared from materials comprising recycled polyester and chain extended polyester. Specifically, the recycled polyester and the chain-extended polyester may be subjected to a kneading granulation process to form recycled polyester pellets, wherein the kneading granulation temperature may be between 260 ℃ and 280 ℃, and the rotational speed of the twin screw used for the kneading granulation may be between 200rpm and 260 rpm. In some embodiments, the recycled polyester and the chain extended polyester can each be prepared using the solid state polymerization described above. The recycled polyester can be configured to increase the weight ratio of recycled raw materials in the recycled polyester pellets, so that the recycled fibers prepared from the recycled polyester pellets have high environmental protection, and the chain extension polyester can be configured to increase the intrinsic viscosity of the recycled polyester pellets, so that the recycled polyester pellets have similar melt spinning stability to the virgin polyester pellets. In the whole, the content of the recycled polyester in the recycled polyester pellets may be between 98 parts by weight and 99 parts by weight, and the content of the chain extension polyester is between 1 part by weight and 2 parts by weight, so that the environmental protection of the recycled fibers prepared from the recycled polyester pellets and the melt spinning stability of the recycled polyester pellets are both considered.
Further description will be made on recycled polyester in the recycled polyester pellets. In some embodiments, the recycled polyester may be, for example, polyethylene terephthalate. In some embodiments, the recycled polyester may, for example, have the form of polyester pellets, thereby improving storage convenience. Specifically, the recycled polyester can be produced, for example, by subjecting waste cloth or fiber to steps such as screening, purifying, pulverizing, melting, kneading, modifying, granulating, and the like. The chain-extended polyesters in the recycled polyester pellets are further described. In some embodiments, the chain extended polyester may be prepared from a material comprising 90 to 98 parts by weight virgin polyester and 2 to 10 parts by weight of a chain extender, wherein the chain extender may be configured to promote the degree of crosslinking of the virgin polyester so that the recycled polyester pellets have a suitable intrinsic viscosity to facilitate melt spinning. Virgin polyesters and chain extenders falling within the above content ranges can help to impart high melt spinning stability to the recycled polyester pellets and can reduce the likelihood of the material used to form the recycled fibers breaking during false twisting processing. In some embodiments, the virgin polyester may be, for example, polyethylene terephthalate, polybutylene terephthalate, or a combination thereof. In some embodiments, the chain extended polyester may, for example, have the form of polyester pellets, thereby enhancing storage convenience. Specifically, the virgin polyester and the chain extender may be subjected to a kneading and granulating process to form chain-extended polyester pellets.
In some embodiments, the chain extender comprises a structure as shown in formula (1):
wherein n is a positive integer between 1 and 3, and m is a positive integer between 1 and 3. When the chain extender comprises a structure as shown in formula (1) above, the chain extender may be present in an amount of between 1000ppm and 2000ppm based on the total weight of the recycled polyester pellets. In detail, if the above content is less than 1000ppm, the chain extension polyester may have a limited ability to raise the degree of crosslinking of the virgin polyester; if the above content is more than 2000ppm, the material used to form the regenerated fiber may have a greater chance of breaking during false twisting. In other embodiments, the chain extender comprises a structure as shown in formula (2):
when the chain extender comprises a structure as shown in formula (2) above, the chain extender may be present in an amount of between 150ppm and 500ppm based on the total weight of the recycled polyester pellets. In detail, if the above content is less than 150ppm, the chain extension polyester may have a limited ability to raise the degree of crosslinking of the virgin polyester; if the above content is more than 500ppm, the material used to form the regenerated fiber may have a greater chance of breaking during false twisting. It is to be noted that, compared with the chain extender comprising the structure represented by the formula (1), the chain comprising the structure represented by the formula (2)The extender has more functional groups that can react with the virgin polyester, so when the chain extender having the structure shown in formula (2) is used to prepare the recycled polyester pellets, a significant chain extension effect can be achieved with a small amount of the chain extender, contributing to the convenience of the process and the cost saving.
It is additionally noted that the recycled polyester pellets of the present disclosure may have good color performance and thus be free from adverse effects on the dyeing process of fibers or fabrics formed from the recycled polyester pellets, thereby providing a wide range of applicability. In some embodiments, the recycled polyester particles may have an L value greater than 80 and a b value less than 10 in the L x a x b color space, exhibiting high whiteness and low yellowness. Based on this, the regenerated fiber of the present disclosure may have an L value greater than 93 and a b value less than 3 in the L x a x b x color space, which shows similar color controllability as the virgin fiber. In addition, when the regenerated polyester pellets of the present disclosure were subjected to a pressure rise test with a screen having a pore size of 40 μm, the regenerated polyester pellets of the present disclosure may have a pressure rise value of less than or equal to 10bar/kg, showing good spinnability. In addition, recycled fibers to the present disclosure may have a fiber strength of greater than or equal to 3g/d, consistent with industry standards.
In the following description, various evaluations will be made with respect to the recycled polyester pellets and recycled fibers of the present disclosure. It is to be understood that the materials used, the amounts and proportions thereof, the details of processing, the flow of processing, etc., may be varied as appropriate without departing from the scope of the present disclosure. Accordingly, the disclosure should not be construed as being limited by the embodiments set forth below.
< experimental example 1: intrinsic viscosity evaluation, color evaluation and Filter evaluation of polyester pellets-
In this experimental example, the intrinsic viscosity evaluation, the color evaluation, and the sieve evaluation were performed on the virgin polyester pellets of the comparative example and the reclaimed polyester pellets of each example. The comparative examples and the results of the explanation and evaluation of each example are shown in table one. The polyester in the virgin polyester pellets of comparative example 1 was polyethylene terephthalate, the polyester in the recycled polyester pellets of examples 1 to 3 was polyethylene terephthalate, and the polyester in the recycled polyester pellets of example 4 included polyethylene terephthalate and polybutylene terephthalate (the polybutylene terephthalate content was 1wt% based on the total weight of the recycled polyester pellets, and the source of polybutylene terephthalate was virgin polyester in the chain extended polyester).
List one
Note 1: the chain extender is present in an amount based on the total weight of the recycled polyester pellets.
And (2) injection: filter evaluation by means of a filter screen representing a pore size of 40 μm, the polyester pellets have a pressure rise value of less than or equal to 10 bar/kg.
And (3) injection: the recycled polyester pellets of examples 1 to 4 were formed by non-solid state polymerization, while the recycled polyester pellets of example 12 were formed by solid state polymerization.
As can be seen from the results of Table I, when the content of the chain extender is increased, the intrinsic viscosity of the reclaimed polyester pellets is increased to approach the intrinsic viscosity of the virgin polyester pellets. In addition, the recycled polyester particles of each embodiment have an L value of more than 80 and a b value of less than 10, which shows good color performance and can avoid adverse effects on the dyeing process of the recycled fiber or fabric formed later. In addition, the recycled polyester pellets of each example were evaluated by a sieve, showing good spinnability.
< experimental example 2: evaluation of weight average molecular weight of polyester in polyester particles-
In this experimental example, weight average molecular weight evaluation was performed on the polyester in the virgin polyester pellets of comparative example 1 and the polyester in the recycled polyester pellets of examples 1 to 2 and 12. The evaluation results are shown in Table II.
Watch II
From the results of Table II, it is clear that the weight average molecular weight of the polyester in the reclaimed polyester pellets of examples 1 to 2 is very close to that of the virgin polyester pellets of comparative example 1, and that the addition of the chain extender has a certain effect on the weight average molecular weight of the polyester in the polyester pellets. On the other hand, the weight average molecular weight of the polyester in the reclaimed polyester pellets of example 12 was similar to that of the reclaimed polyester pellets of example 2, and it was found that the weight average molecular weight of the polyester in the reclaimed polyester pellets formed by solid state polymerization could be still quite close to that of the reclaimed polyester pellets formed without solid state polymerization, which could contribute to the reduction of the ratio of the intrinsic viscosity of the reclaimed polyester pellets to the intrinsic viscosity of the virgin polyester pellets in the range of 0.89 to 1.13 on a cost-effective basis. < experimental example 3: spinnability evaluation, false twist processability evaluation, elongation variability evaluation of regenerated fibers >
In this experimental example, the virgin polyester pellets of comparative example 1 were spun to form the virgin fibers of comparative example 2, and the recycled polyester pellets of examples 1 to 4, 12 were spun together with the virgin polyester pellets of comparative example 1 to form the recycled fibers of examples 5 to 9, 13. Next, the virgin fiber of comparative example 2 and the regenerated fibers of examples 5 to 9 and 13 were subjected to spinnability evaluation, false twist processability evaluation and elongation variability evaluation. The comparative examples and the results of the explanation and evaluation of each example are shown in Table III.
Watch III
From the results of table three, it was found that when the recycled polyester pellets of example 3 were used to prepare recycled fibers, partially drawn yarns (Partially Oriented Yarn, POY) could be obtained smoothly, but when the POY was subsequently false-twisted, yarn breakage could occur, and draw textured yarns (Draw Textured Yarn, DTY) could not be formed smoothly. In addition, the regenerated fibers of each of the embodiments may have a variability in elongation of less than 7%, indicating that each regenerated fiber may provide a fairly consistent elongation, such that regenerated textiles made from regenerated fibers may be free of cross-bar problems after dyeing. It can be seen that although the recycled fibers prepared using the recycled polyester pellets of example 3 are more difficult to process to form stretch textured yarns, they still have relatively little variability in elongation, so that the subsequently formed recycled textiles can be protected from the cross-bar problem after dyeing.
< experimental example 4: color evaluation and horizontal evaluation of regenerated textiles >
In this experimental example, the regenerated textiles of examples 10, 11, 14 were prepared with the regenerated fibers of examples 6, 9, 13, respectively, and the regenerated textiles of examples 10, 11, 14 were color evaluated. The regenerated textiles of examples 10, 11, 14 were then dyed and subjected to bar evaluation after dyeing. The evaluation results are shown in Table four.
Table four
As can be seen from the results of table four, the regenerated textiles of examples 10, 11, and 14 all had no cross-bar problem, and the regenerated textiles had L values of greater than 93 and b values of less than 3 in the L x a x b x color space prior to dyeing, showing high whiteness and low yellowness, thereby providing wide dyeing applicability.
According to the above embodiments of the present disclosure, the recycled fibers of the present disclosure are prepared from a material comprising virgin polyester pellets and recycled polyester pellets. By controlling the intrinsic viscosity of the virgin polyester pellets and the ratio (proportion) of the intrinsic viscosity of the recycled polyester pellets, the recycled textile made of recycled fibers can be free from the problem of cross-bars after dyeing.
While the present disclosure has been described with reference to the exemplary embodiments, it should be understood that the invention is not limited thereto, but may be embodied with various changes and modifications without departing from the spirit or scope of the present disclosure.
Claims (10)
1. A recycled fiber prepared from a material comprising:
primary polyester pellets; and
a recycled polyester pellet having a ratio of intrinsic viscosity to intrinsic viscosity of the virgin polyester pellet of between 0.89 and 1.13.
2. The recycled fiber of claim 1, wherein the weight ratio of the virgin polyester particle content to the recycled polyester particle content is between 1:1 to 8: 2.
3. The recycled fiber of claim 1, wherein the weight average molecular weight of the polyester in the virgin polyester pellets is between 30000g/mol and 40000g/mol, and the weight average molecular weight of the polyester in the recycled polyester pellets is between 30000g/mol and 48000 g/mol.
4. The recycled fiber of claim 1, wherein the weight average molecular weight of the polyester in the virgin polyester pellets is between 30000g/mol and 40000g/mol, and the weight average molecular weight of the polyester in the recycled polyester pellets is between 47000g/mol and 48000 g/mol.
5. The recycled fiber of claim 1, wherein the recycled polyester pellets are prepared from a material comprising:
regenerating the polyester; and
a chain extended polyester comprising from 90 to 98 parts by weight virgin polyester and from 2 to 10 parts by weight chain extender.
6. The recycled fiber of claim 5, wherein the recycled polyester is present in an amount of between 98 parts by weight and 99 parts by weight and the chain extended polyester is present in an amount of between 1 parts by weight and 2 parts by weight.
7. The regenerated fiber according to claim 5 wherein the chain extender comprises a structure as shown in formula (1):
wherein n is a positive integer between 1 and 3, and m is a positive integer between 1 and 3.
8. The recycled fiber of claim 7, wherein the chain extender is present in an amount of between 1000ppm and 2000ppm based on the total weight of the recycled polyester pellets.
9. The regenerated fiber according to claim 5 wherein the chain extender comprises a structure as shown in formula (2):
10. the recycled fiber of claim 9, wherein the chain extender is present in an amount of between 150ppm and 500ppm based on the total weight of the recycled polyester pellets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210365748.6A CN116926716A (en) | 2022-04-08 | 2022-04-08 | Regenerated fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210365748.6A CN116926716A (en) | 2022-04-08 | 2022-04-08 | Regenerated fiber |
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| Publication Number | Publication Date |
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| CN116926716A true CN116926716A (en) | 2023-10-24 |
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| CN202210365748.6A Pending CN116926716A (en) | 2022-04-08 | 2022-04-08 | Regenerated fiber |
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- 2022-04-08 CN CN202210365748.6A patent/CN116926716A/en active Pending
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