CN108138379B - Parallel composite fiber - Google Patents
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- CN108138379B CN108138379B CN201780003396.7A CN201780003396A CN108138379B CN 108138379 B CN108138379 B CN 108138379B CN 201780003396 A CN201780003396 A CN 201780003396A CN 108138379 B CN108138379 B CN 108138379B
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- 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
- D01D5/08—Melt spinning methods
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- 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
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/32—Side-by-side structure; Spinnerette packs therefor
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- 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
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Abstract
The invention discloses a side-by-side type composite fiber, which is prepared by mixing polybutylene terephthalate with intrinsic viscosity of 1.00-2.00 dl/g and polyester with intrinsic viscosity of 0.45-0.65 dl/g in a ratio of 70: 30-30: 70, wherein the intrinsic viscosity difference between the polybutylene terephthalate and the polyester is 0.35-1.55 dl/g, the elastic elongation of the fiber is 20-129%, and the elastic recovery rate is more than 65%.
Description
Technical Field
The invention relates to a side-by-side type composite fiber with good elasticity, in particular to a bi-component elastic fiber containing polybutylene terephthalate.
Background
The parallel composite fiber is the most important composite fiber variety with relatively large yield in the earliest development, and the chemical fiber is mainly used for simulating the curling elasticity of natural wool when people research and develop the composite fiber. With the increasing depth of the microstructure, it was found that the cross section of wool is different from other natural fibers, and it is composed of an ortho-cortex and a para-cortex which are approximately two semicircles and are closely adhered to each other. The nature and arrangement of the various structural units (microfibrillar crystalline and disordered regions, etc.) of these two parts are different. In the dry state the secondary cortex shrinks slightly less than the normal cortex, thus causing the bodies to curl helically around each other or twist off each other in the axial direction of the fiber. The side-by-side composite fiber with high natural crimp and bulkiness is developed successfully under the bionic inspiration of wool keratin fiber. The preparation method of the composite fiber comprises the following steps: two polymers different in thermal or wet expansibility are spun in parallel into a single fiber like two kinds of skins, and the single fiber is shrunk by heating, so that a spiral three-dimensional crimp can be obtained. Since the crimp comes from the inherent properties of the fiber, it is permanent, unlike the crimp deformation that is typically formed by externally applied heat and mechanical action.
Since the 21 st century, the side-by-side elastic fiber is receiving more and more attention, and gradually occupies a great position in the chemical fiber field. It has self-crimping property, and can produce spiral three-dimensional crimp based on different shrinkability of two components in the composite fiber. Its advantages are high bulkiness, elasticity and resilience, and good hand feeling.
The Chinese application CN1962968A discloses a preparation method and application of PBT/PET three-dimensional crimped fiber, PBT polybutylene terephthalate slice with intrinsic viscosity of 1.00dl/g and PET polyethylene terephthalate slice with intrinsic viscosity of 0.64dl/g are used as raw materials, PBT is melted at low temperature and extruded at high temperature, PET is melted at high temperature and extruded at low temperature, parallel fiber winding yarns are obtained through a parallel composite assembly, and the winding yarns are balanced, bunched, stretched in oil-immersed water bath, oiled, cut off and subjected to relaxation and heat setting to obtain the PBT/PET three-dimensional crimped fiber. The elastic fiber obtained by combining the two kinds of PBT having intrinsic viscosities and PET and stretch-cutting the mixture, however, the difference in intrinsic viscosities is small, the intrinsic viscosity of PET is large, the potential shrinkage rate of the fiber is not high, and high elastic elongation and elastic recovery rate cannot be obtained after stretching.
Chinese patent CN101851812A discloses a parallel composite fiber formed by polybutylene terephthalate and polyethylene terephthalate, wherein the intrinsic viscosity difference between the polybutylene terephthalate and the polyethylene terephthalate is 0.40-1.05 dl/g, and the elastic fiber with elastic elongation of 130-220% and elastic recovery rate of more than 85% is obtained by extrusion molding through a clapboard type parallel spinneret plate and hot needle extension false twisting. However, since the elastic fiber obtained by the hot-pin draw false twisting, so-called external false twisting, is used in this application, the elongation is relatively excessively high, and thus the fabric is likely to be wrinkled and deformed after being stretched, and the high elastic recovery can be properly recovered, but the appearance is affected, and the application range is limited.
Chinese patent CN1854355A discloses a parallel type composite fiber in which a cationic dye-dyeable copolyester component and a polyethylene terephthalate component are compounded in parallel, but the intrinsic viscosity difference between the cationic dye-dyeable copolyester component and the polyethylene terephthalate component in the fiber is not large, the viscosity difference is only 0.02-0.10, and the fiber does not have good contractibility.
Disclosure of Invention
The invention aims to provide a bi-component elastic fiber with moderate elasticity and good elastic recovery rate and a preparation method thereof.
The technical solution of the invention is as follows:
a side-by-side type composite fiber is prepared by carrying out side-by-side composite spinning on polybutylene terephthalate with the intrinsic viscosity of 1.00-2.00 dl/g and polyester with the intrinsic viscosity of 0.45-0.65 dl/g according to the weight ratio of 70: 30-30: 70 and then carrying out false twisting processing; wherein the intrinsic viscosity difference between the polybutylene terephthalate and the polyester is 0.35 to 1.55dl/g, the elastic elongation of the fiber is 20 to 129 percent, and the elastic recovery rate is more than 65 percent.
One preferable technical scheme is that the polyester is polyethylene terephthalate, and the intrinsic viscosity of the polyethylene terephthalate is 1.00-1.80 dl/g; the filament number of the side-by-side type composite fiber is 0.45 to 7.00 dtex.
The other preferable technical scheme is that the polyester is cationic dyeable copolyester, and the intrinsic viscosity of the polybutylene terephthalate is 1.00-1.50 dl/g; the cationic dyeable copolyester contains a structural unit formed by isophthalic acid or a derivative thereof with sodium sulfonate groups, and the structural unit accounts for 0.20-1.00 wt% of the cationic dyeable copolyester by sulfur element; the isophthalic acid or the derivative thereof with sodium sulfonate groups is isophthalic acid-5-sodium sulfonate, dimethyl isophthalate-5-sodium sulfonate or ethylene glycol isophthalate-5-sodium sulfonate; the fiber has a color development L value of 16.0 or less after cationic dyeing.
The intrinsic viscosity difference between the polybutylene terephthalate and the polyester is preferably 0.4-1.05 dl/g.
The invention has the advantages that: conventional polybutylene terephthalate fibers have a limited range of application due to their high cost in chips, and single-component polybutylene terephthalate fibers have a high elastic elongation but a poor elastic recovery. The polybutylene terephthalate and the polyester are combined to manufacture the elastic fiber, so that the cost of fiber raw materials is reduced, and the elastic recovery rate is improved under the condition of ensuring moderate elastic elongation. False twisting is adopted for the crimped yarn, and firstly, the natural crimp generated by the viscosity difference of two components is determined by the fiber structure, so that the crimped yarn has permanence; secondly, the false twisting process physically elasticizes the fibers, thereby obtaining better elasticity than the stretch yarn. The elastic fiber produced by the technology has the elastic elongation of 20-129% and the elastic recovery rate of more than 65%.
Drawings
FIG. 1 is a circular sectional view of a side-by-side composite elastic fiber according to the present invention.
FIG. 2 is a cross-sectional view of a double-kernel peanut shape of the side-by-side composite elastic fiber of the present invention.
Detailed Description
The parallel composite fiber is prepared by carrying out parallel composite spinning on polybutylene terephthalate (PBT) with the intrinsic viscosity of 1.00-2.00 dl/g and polyester with the intrinsic viscosity of 0.45-0.65 dl/g according to the weight ratio of 70: 30-30: 70 and then carrying out false twisting processing; wherein the intrinsic viscosity difference between the polybutylene terephthalate and the polyester is 0.35 to 1.55dl/g, the elastic elongation of the fiber is 20 to 129 percent, and the elastic recovery rate is more than 65 percent.
The intrinsic viscosity of the polyester is 0.45-0.65 dl/g, because if the polyester with overhigh intrinsic viscosity is combined with the polybutylene terephthalate, the elastic elongation of the parallel fiber obtained by melt composite spinning and the fabric obtained by the fiber is poorer, and if the polyester with overhigh intrinsic viscosity is combined with the polybutylene terephthalate, the performance of the parallel fiber obtained by composite spinning is not improved greatly, the cost is improved, and the spinning performance is poor. The polyesters mentioned in this patent include polyethylene terephthalate (PET), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT) and their modified copolyesters. The modified copolymer of polyethylene terephthalate is, for example, polyethylene terephthalate modified with a known comonomer or modified by blending, such as cationic polyethylene terephthalate, flame-retardant polyethylene terephthalate, and full-dull polyethylene terephthalate.
Selecting polybutylene terephthalate with the intrinsic viscosity difference of 0.35-1.55 dl/g with polyester, because the intrinsic viscosity difference is lower than 0.35dl/g, the fiber elasticity is not obvious; when the intrinsic viscosity difference is increased, the elastic performance is improved, and when the viscosity difference is higher than 1.55dl/g, the improvement degree of the elastic performance is reduced, the spinning performance is deteriorated due to the high viscosity difference, the bending effect of the orifice of the spinneret plate is increased, and the spinning is difficult, so that the intrinsic viscosity difference is preferably selected to be 0.35 to 1.55dl/g, and preferably 0.40 to 1.05 dl/g.
The intrinsic viscosity range of the polybutylene terephthalate adopted by the invention is 1.00-2.00 dl/g. When the intrinsic viscosity of polybutylene terephthalate is more than 2.00dl/g, the melt composite spinning is difficult and the slicing cost is increased; when the intrinsic viscosity of polybutylene terephthalate is less than 1.00dl/g, the physical properties of the fiber are impaired, and the elasticity of the side-by-side conjugate fiber obtained is not significant. The polybutylene terephthalate comprises polybutylene terephthalate and copolyester thereof, such as cationic dyeable polybutylene terephthalate and the like.
In order to consider the cost and the elastic performance of the side-by-side type composite fiber, the weight ratio of the polybutylene terephthalate to the polyester is 70: 30-30: 70.
From the perspective of moderate elasticity, the elastic fiber of the invention has an elastic elongation of 20-129% and an elastic recovery of more than 65%.
The elastic fiber of the invention can be round, double-kernel peanut-shaped and the like in section. Since it is a false twist fiber, the cross-sectional shape is preferably circular. The spinneret plate is a partition plate type or post-confluence type composite spinneret plate, and the partition plate type composite spinneret plate is preferred because the spinneret holes are provided with partition plates, two components of polymers are bonded behind the spinneret holes, the bending effect of the orifice is reduced, the spinning performance is improved, and the cross section of the fiber is circular and has good elasticity and resilience. And the cross section of the obtained fiber is in a double-kernel peanut shape. Compared with the post-converging composite spinneret plate, the partition plate type composite spinneret plate is expensive to manufacture, and the post-converging composite spinneret plate is good in cost.
The invention also provides two preferable technical schemes under the conditions that the intrinsic viscosity of the polybutylene terephthalate is 1.00-2.00 dl/g, the intrinsic viscosity of the polyester is 0.45-0.65 dl/g, the viscosity difference between the polybutylene terephthalate and the polyester is 0.35-1.55 dl/g, the weight ratio of the polybutylene terephthalate to the polyester is 70: 30-30: 70, the elastic elongation of the fiber is 20-129%, and the elastic recovery rate is more than 65%.
The preferred technical scheme A:
the polyester is polyethylene terephthalate, and in this case, the intrinsic viscosity of the polybutylene terephthalate is preferably in the range of 1.00 to 1.80 dl/g. When the viscosity of polybutylene terephthalate is too high, spinnability is deteriorated, and spinning at a higher spinning temperature is required, which results in deterioration of physical properties of the resulting fiber.
Due to the difference between the requirement and the application, the filament number of the fiber is preferably in the range of 0.45-7.00 dtex, the filament number of the composite fiber in the range is 33 dtex-167 dtex, and the number of single-bundle fibers can be from 12 to 72, so that the composite fiber can meet multiple applications.
The manufacturing method of the preferred technical scheme A specifically comprises the steps of respectively drying polyethylene terephthalate slices with the intrinsic viscosity of 0.45-0.65 dl/g and polybutylene terephthalate slices with the intrinsic viscosity of 1.00-1.80 dl/g to the moisture content of less than 100ppm, and respectively feeding the dried polyethylene terephthalate slices and polybutylene terephthalate slices into screws A and B for melt extrusion, wherein the melt extrusion temperature of the polybutylene terephthalate is 245-285 ℃, and the lower the temperature is, the better the elastic performance of the elastic fiber is; the melt extrusion temperature of the polyethylene terephthalate is 275-300 ℃, then the polyethylene terephthalate is extruded and molded by a clapboard type or post-converging type composite spinneret plate through a metering pump under the condition of the spinning box temperature of 265-295 ℃, the polyethylene terephthalate is coiled under the condition of the speed of 2000-5000 m/min, and then the parallel composite elastic fiber is prepared under the conditions of the false twisting temperature of 170-210 ℃, the false twisting processing magnification of 1.20-2.50, the processing speed of 300-800 m/min, false twisting of a false twisting disc, belt false twisting or needle false twisting.
The preferred technical proposal A of the invention is that the elongation of the side-by-side composite fiber is more than 25 percent, the breaking strength is more than 2.0cN/dtex, the elastic elongation is 25 to 129 percent, and the elastic recovery rate is more than 65 percent.
The preferred technical scheme B:
the polyester is cationic dyeable copolyester, and the intrinsic viscosity of the polybutylene terephthalate is preferably in the range of 1.00-1.50 dl/g.
The cationic dyeable copolyester contains a structural unit formed by isophthalic acid or a derivative thereof with sodium sulfonate groups, and the content of the structural unit is preferably 0.20-1.00 wt% of the cationic dyeable copolyester in terms of sulfur. When the content of the structural unit in the cationic dyeable copolyester is too small, the obtained side-by-side type composite fiber has no cationic dyeability; when the content of the structural unit in the cationic dyeable copolyester is too high, the physical properties of the obtained parallel composite fiber are reduced, and the practical application is poor. In order to obtain the ideal cationic dyeable characteristic of the side-by-side type composite fiber, the content of the sulfur element accounts for 0.25 to 0.80 weight percent of the cationic dyeable copolyester.
The isophthalic acid or the derivative thereof with sodium sulfonate groups is preferably 5-sodium isophthalate, 5-sodium isophthalate or 5-sodium ethylene glycol isophthalate.
When the polyester is a cationic dye-dyeable copolyester, the spinnability of the polyester and the physical properties of the resulting fiber are reduced due to the presence of structural units in the polyester segment formed from isophthalic acid or derivatives thereof bearing sodium sulfonate groups. Therefore, the polybutylene terephthalate with proper intrinsic viscosity and cationic dye dyeable copolyester are selected for parallel composite spinning during spinning. The invention is preferably polybutylene terephthalate with the intrinsic viscosity of 1.00-1.50 dl/g, and the polybutylene terephthalate has excellent spinnability and the obtained fiber has good physical properties.
Preferably, the manufacturing method of the technical scheme B comprises the steps of respectively drying cationic dyeable copolyester slices with the intrinsic viscosity of 0.45-0.65 dl/g and polybutylene terephthalate slices with the intrinsic viscosity of 1.00-1.50 dl/g until the water content is below 80 ppm; then respectively feeding the fibers into a screw A and a screw B for melt extrusion, wherein the extrusion temperature of the cationic dye dyeable copolyester slices is 265-285 ℃, the extrusion temperature of the polybutylene terephthalate is 245-285 ℃, and the lower the temperature is, the better the elastic property of the parallel fibers is; and finally, metering by a metering pump under the condition of a spinning box temperature of 265-295 ℃, and performing extrusion molding by a parallel spinneret plate. In the preparation process, the extension yarn can be prepared by a one-step method; or pre-oriented yarns are prepared under the condition that the speed is 2000-5000 m/min, and then false twisting is carried out on the pre-oriented yarns to prepare the parallel composite elastic fibers. The false twist process includes internal and external drafting.
According to the preferable technical scheme B of the invention, the elongation of the parallel composite fiber is more than 25%, the breaking strength is more than 2.0cN/dtex, the elastic elongation is 25-100%, and the elastic recovery rate is more than 65%; the color development L value of the fiber after being dyed by the cationic dye is below 16.0.
In the present invention, the obtained side-by-side type conjugate fiber was evaluated by the following method.
(1) Spinnability
The spinning condition within 2 hours of spinning was evaluated by the following methods, and the condition of no yarn breakage was marked as "good", the condition of a small amount of yarn breakage (1 to 3 times) was marked as "good", and the condition of frequent yarn breakage (4 times or more) was marked as "poor", and the conditions of "good" and "poor" were judged as "good".
(2) Strength, elongation, product of strength and elongation of fiber
The test was carried out according to the national standard GB14344, strength and elongation product × (elongation)0.5The strength is the stress/fineness (cN/dtex) of the maximum breaking point in the stress-strain elongation of the fiber, and the elongation is the strain (%) of the maximum breaking point of the fiber. 10 samples are respectively taken for testing, and the final result is averaged.
(3) Determination of sulfur element content in cationic dyeable copolyester
6g of cationic dyeable copolyester was pressed into a sheet, the intensity thereof was measured by a fluorescence X-ray analyzer (model 3270X-ray analyzer manufactured by Chong electric Co., Ltd.), and the measurement was performed by a detection line prepared in advance for a sample having a known metal content.
(4) Color development
After the yarn was woven into a tubular knit fabric, the fabric was subjected to a cationic dyeing process (dye concentration: 5% by weight relative to the fabric) to measure a color tone Lab value of the fabric. Color development is characterized by a hue L value. The lower the L value, the better the color development.
(5) Intrinsic viscosity (dl/g)
0.8g of a polymer was dissolved in 10ml of an o-chlorophenol solvent, and the resulting solution was measured at 25 ℃ by an automatic viscosity measuring apparatus manufactured by Sci.
(6) Elastic elongation and elastic recovery
The method for measuring the elastic elongation and elastic recovery referred to in the present specification is measured in accordance with JIS L1090-1992.
The present invention will be further described with reference to the following examples.
Example 1
The melt process of preparing elastic bicomponent fiber includes compounding and spinning polybutylene terephthalate with intrinsic viscosity of 1.31dl/g and polyethylene terephthalate with intrinsic viscosity of 0.51dl/g, and has intrinsic viscosity difference of 0.80 dl/g. Drying respectively to make the water content less than 100ppm, and putting the dried polybutylene terephthalate and polyethylene terephthalate into No. 1/No. 2 spinning boxes respectively according to the weight ratio of 50: 50. Setting the spinning temperature, wherein the temperature of a No. 1 extruder screw is 265 ℃; the screw temperature of the No. 2 spinning machine is 285 ℃; the spinning beam temperature was 270 ℃. Spinning is carried out by using a parallel spinneret, the winding speed is set to 2500m/min, and the variety of the protofilament is controlled to be 300 dtex/48F.
The wound pre-oriented yarn is subjected to false twisting by a false twisting disk, the temperature of a hot box is 190 ℃, the false twisting multiplying power is set to be 1.85, and the extension speed is 500 m/min. The final DTY variety is 167dtex/48F, and the filament number is 3.48 dtex.
The DTY yarn after false twisting was measured for strength, elongation, elastic elongation, and elastic recovery. Specific values are shown in table 1.
Example 2
The same polymer weight ratio, spinning temperature, spinning speed, raw yarn type, processing mode, processing temperature, processing rate and processing speed as those of example 1 were used, but the intrinsic viscosity difference between the two polymers was changed, and polybutylene terephthalate having an intrinsic viscosity of 1.50dl/g and polyethylene terephthalate having an intrinsic viscosity of 0.45dl/g were selected for composite spinning, and the intrinsic viscosity difference was 1.05 dl/g. Specific values are shown in table 1.
Example 3
The same polymer weight ratio, spinning temperature, spinning speed, raw yarn type, processing mode, processing temperature, processing rate and processing speed as those of example 1 were used, but the intrinsic viscosity difference between the two polymers was changed, and polybutylene terephthalate having an intrinsic viscosity of 1.00dl/g and polyethylene terephthalate having an intrinsic viscosity of 0.60dl/g were selected for composite spinning, and the intrinsic viscosity difference was 0.40 dl/g. Specific values are shown in table 1.
Example 4
The polymer having the same intrinsic viscosity as in example 1, spinning temperature, spinning speed, raw yarn type, processing method, processing temperature, processing rate and processing speed were used, but the weight ratio of the two polymers was changed. The weight ratio of polybutylene terephthalate to polyethylene terephthalate was changed from 50: 50 to 70: 30. Specific values are shown in table 1.
Example 5
The polymer having the same intrinsic viscosity as in example 1, spinning temperature, spinning speed, raw yarn type, processing method, processing temperature, processing rate and processing speed were used, but the weight ratio of the two polymers was changed. The weight ratio of polybutylene terephthalate to polyethylene terephthalate was changed from 50: 50 to 30: 70. Specific values are shown in Table 2.
Example 6
The same intrinsic viscosity polymer, polymer weight ratio, spinning speed, yarn type, processing method, processing temperature, processing magnification and processing speed as those of example 1 were used, but the spinning temperature and the false twisting method of polybutylene terephthalate were changed. The screw temperature of polybutylene terephthalate was reduced from 265 ℃ to 245 ℃. Specific values are shown in Table 2.
Example 7
The same intrinsic viscosity polymer, polymer weight ratio, spinning temperature, processing mode, processing temperature, processing speed as in example 1 were used, but the spinning speed was varied. The spinning speed is increased from 2500m/min to 4000 m/min. The protofilament variety is correspondingly changed into 200dtex/48F, the multiplying power is changed into 1.20, and the final DTY variety is still 167 dtex/48F. Specific values are shown in Table 2.
Example 8
The same intrinsic viscosity polymer, polymer weight ratio, spinning temperature, spinning speed, processing method, processing temperature, processing ratio and processing speed as those of example 1 were used, except that the variety of the precursor was changed to 60dtex/72F, the final DTY variety 33dtex/72F and the single fiber fineness was 0.46 dtex. Specific values are shown in Table 2.
Example 9
The same intrinsic viscosity of the polymer, polymer weight ratio, spinning temperature, spinning speed, processing method, processing temperature, processing magnification and processing speed as those of example 1 were used, but the false twisting method was changed to 300dtex/24F for the raw yarn variety, 167dtex/24F for the final DTY variety, and 6.96dtex for the single fiber fineness. Specific values are shown in Table 3.
Example 10
The polymer having the same intrinsic viscosity as in example 1, the polymer weight ratio, the spinning temperature, the spinning speed, the raw yarn variety, the processing method, the processing magnification, and the processing speed were used, but the processing temperature was changed. The hot box temperature rose from 190 ℃ to 210 ℃. Specific values are shown in Table 3.
Example 11
The polymer having the same intrinsic viscosity as in example 1, the polymer weight ratio, the spinning temperature, the spinning speed, the raw yarn variety, the processing method, the processing magnification and the processing speed were used, but a post-converging composite spinneret was used. The cross section of the fiber is double-peanut kernel shape. Specific values are shown in Table 3.
Comparative example 1
The same polymer weight ratio, spinning temperature, spinning speed, raw yarn type, processing method, processing temperature, processing rate and processing speed as those of example 1 were used, but the intrinsic viscosity difference between the two polymers was changed, and polybutylene terephthalate having an intrinsic viscosity of 1.31dl/g and polyethylene terephthalate having an intrinsic viscosity of 0.68dl/g were selected for composite spinning, and the intrinsic viscosity difference was 0.63 dl/g. Specific values are shown in Table 4.
Comparative example 2
The polymer having the same intrinsic viscosity as in example 1, the polymer weight ratio, the spinning temperature, the spinning speed, the raw yarn variety, the processing temperature, the processing magnification and the processing speed were used, but the processing was carried out by using a hot pin and a hot box at 190 ℃ as in example 1. Specific values are shown in Table 4.
TABLE 1
| Item | Unit of | Example 1 | Example 2 | Example 3 | Example 4 |
| Variety of POY | - | 300dtex-48F | 300dtex-48F | 300dtex-48F | 300dtex-48F |
| Intrinsic viscosity of PBT | dl/g | 1.31 | 1.50 | 1.00 | 1.31 |
| Intrinsic viscosity of PET | dl/g | 0.51 | 0.45 | 0.60 | 0.51 |
| Difference in intrinsic viscosity | dl/g | 0.80 | 1.05 | 0.40 | 0.80 |
| Mass ratio of PBT/PET | - | 50/50 | 50/50 | 50/50 | 70/30 |
| PBT spinning temperature | ℃ | 265 | 265 | 265 | 265 |
| Spinning temperature of PET | ℃ | 285 | 285 | 285 | 285 |
| Spinning speed | m/min | 2500 | 2500 | 2500 | 2500 |
| Variety DTY | - | 167dtex-48F | 167dtex-48F | 167dtex-48F | 167dtex-48F |
| Fineness of single filament | dtex | 3.48 | 3.48 | 3.48 | 3.48 |
| Magnification of DTY | - | 1.85 | 1.85 | 1.85 | 1.85 |
| False twisting method | - | False twisting disk | False twisting disk | False twisting disk | False twisting disk |
| Temperature of hot box | ℃ | 190 | 190 | 190 | 190 |
| Speed of processing | m/min | 500 | 500 | 500 | 500 |
| DTY intensity | cN/dtex | 3.32 | 3.02 | 3.61 | 3.54 |
| DTY elongation | ％ | 22.6 | 20.4 | 21.9 | 19.7 |
| DTY elastic elongation | ％ | 65.0 | 80.0 | 40.0 | 50.0 |
| DTY elastic recovery | ％ | 88.0 | 85.0 | 92.0 | 90.0 |
| Cross-sectional shape | - | Circular shape | Circular shape | Circular shape | Circular shape |
TABLE 2
| Item | Unit of | Example 5 | Example 6 | Example 7 | Example 8 |
| Variety of POY | - | 300dtex-48F | 300dtex-48F | 200dtex-48F | 60dtex-72F |
| Intrinsic viscosity of PBT | dl/g | 1.31 | 1.31 | 1.31 | 1.31 |
| Intrinsic viscosity of PET | dl/g | 0.51 | 0.51 | 0.51 | 0.51 |
| Difference in intrinsic viscosity | dl/g | 0.80 | 0.80 | 0.80 | 0.80 |
| Mass ratio of PBT/PET | - | 30/70 | 50/50 | 50/50 | 50/50 |
| PBT spinning temperature | ℃ | 265 | 245 | 265 | 265 |
| Spinning temperature of PET | ℃ | 285 | 285 | 285 | 285 |
| Spinning speed | m/min | 2500 | 2500 | 4000 | 2500 |
| Variety DTY | - | 167dtex-48F | 167dtex-48F | 167dtex-48F | 33dtex-72F |
| Fineness of single filament | dtex | 3.48 | 3.48 | 3.48 | 0.46 |
| Magnification of DTY | - | 1.85 | 1.85 | 1.20 | 1.85 |
| False twisting method | - | False twisting disk | Leather collar | False twisting disk | False twisting disk |
| Temperature of hot box | ℃ | 190 | 190 | 190 | 190 |
| Speed of processing | m/min | 500 | 500 | 500 | 500 |
| DTY intensity | cN/dtex | 3.18 | 3.41 | 3.30 | 3.74 |
| DTY elongation | ％ | 22.2 | 20.7 | 23.5 | 20.7 |
| DTY elastic elongation | ％ | 45.0 | 65.0 | 55.0 | 60.0 |
| DTY elastic recovery | ％ | 91.0 | 87.0 | 92.0 | 85.0 |
| Cross-sectional shape | Circular shape | Circular shape | Circular shape | Circular shape |
TABLE 3
| Item | Unit of | Example 9 | Example 10 | Example 11 |
| Variety of POY | - | 300dtex-24F | 300dtex-48F | 300dtex-48F |
| Intrinsic viscosity of PBT | dl/g | 1.31 | 1.31 | 1.31 |
| Intrinsic viscosity of PET | dl/g | 0.51 | 0.51 | 0.51 |
| Difference in intrinsic viscosity | dl/g | 0.80 | 0.80 | 0.80 |
| Mass ratio of PBT/PET | - | 50/50 | 50/50 | 50/50 |
| PBT spinning temperature | ℃ | 265 | 265 | 265 |
| Spinning temperature of PET | ℃ | 285 | 285 | 285 |
| Spinning speed | m/min | 2500 | 2500 | 2500 |
| Variety DTY | - | 167dtex-24F | 167dtex-48F | 167dtex-48F |
| Fineness of single filament | dtex | 6.96 | 3.48 | 3.48 |
| Magnification of DTY | - | 1.85 | 1.85 | 1.85 |
| False twisting method | - | Needle type | False twisting disk | False twisting disk |
| Temperature of hot box | ℃ | 190 | 210 | 210 |
| Speed of processing | m/min | 500 | 500 | 500 |
| DTY intensity | cN/dtex | 3.15 | 3.22 | 3.16 |
| DTY elongation | ％ | 21.7 | 22.8 | 24.5 |
| DTY elastic elongation | ％ | 63.0 | 75.0 | 68.0 |
| DTY elastic recovery | ％ | 89.0 | 86.0 | 83.0 |
| Cross-sectional shape | Circular shape | Circular shape | Double peanut kernel shape |
TABLE 4
| Item | Unit of | Comparative example 1 | Comparative example 2 |
| Variety of POY | - | 300dtex-48F | 300dtex-48F |
| Intrinsic viscosity of PBT | dl/g | 1.31 | 1.31 |
| Intrinsic viscosity of PET | dl/g | 0.68 | 0.51 |
| Difference in intrinsic viscosity | dl/g | 0.63 | 0.80 |
| Mass ratio of PBT/PET | - | 50/50 | 50/50 |
| PBT spinning temperature | ℃ | 265 | 265 |
| Spinning temperature of PET | ℃ | 285 | 285 |
| Spinning speed | m/min | 2500 | 2500 |
| Variety DTY | - | 167dtex-48F | 167dtex-48F |
| Fineness of single filament | dtex | 3.48 | 3.48 |
| Magnification of DTY | - | 1.85 | 1.85 |
| False twisting method | - | False twisting disk | False twisting disk |
| Temperature of hot box | ℃ | 190 | 190 |
| Speed of processing | m/min | 500 | 500 |
| DTY intensity | cN/dtex | 3.23 | 3.35 |
| DTY elongation | ％ | 23.4 | 24.1 |
| DTY elastic elongation | ％ | 10.0 | 70.0 |
| DTY elastic recovery | ％ | 98.0 | 85.0 |
| Cross-sectional shape | Circular shape | Circular shape |
Example 12
The side-by-side type composite fiber is prepared by a melting method, and composite spinning is carried out on polybutylene terephthalate (PBT) with the intrinsic viscosity of 1.10dl/g and cationic dye dyeable copolyester with the intrinsic viscosity of 0.50dl/g and the S element content of 0.40 wt%, wherein the intrinsic viscosity difference is 0.60 dl/g. Drying respectively to make the water content less than 80ppm, and respectively putting the dried polybutylene terephthalate and cationic dye dyeable copolyester into A, B screws for extrusion according to the weight ratio of 50: 50. The temperature of the screw A is 260 ℃, the temperature of the screw B is 270 ℃, and the temperature of the spinning manifold is 275 ℃. Spinning is carried out by using a side-by-side spinneret. Setting the winding speed to 2500m/min to obtain the pre-oriented yarn with the variety of 150T-24 f.
And false twisting the coiled pre-oriented yarn, wherein the temperature of a false twisting hot needle is 90 ℃, the temperature of a hot box is 150 ℃, the extension multiplying power of the hot needle is 1.60 times, the extension multiplying power of the hot box is 1.0 time, and the total extension multiplying power is 1.60 times. The processing speed was 500 m/min. The final DTY variety is 84T-24 f.
The physical properties of the obtained DTY were measured, and specific numerical values are shown in Table 5.
Example 13
Composite spinning was carried out as in example 12 except that polybutylene terephthalate having an intrinsic viscosity of 1.25dl/g and cationic dyeable copolyester having an intrinsic viscosity of 0.65dl/g were selected. Specific values are shown in Table 5.
Example 14
Composite spinning was carried out as in example 12 except that polybutylene terephthalate having an intrinsic viscosity of 1.20dl/g and cationic dyeable copolyester having an intrinsic viscosity of 0.60dl/g were selected. Specific values are shown in Table 5.
Comparative example 3
Composite spinning was carried out as in example 12 except that polybutylene terephthalate having an intrinsic viscosity of 1.00dl/g and cationic dyeable copolyester having an intrinsic viscosity of 0.40dl/g were selected. Specific values are shown in Table 5.
Comparative example 4
Composite spinning was carried out as in example 12 except that polybutylene terephthalate having an intrinsic viscosity of 1.30dl/g and cationic dyeable copolyester having an intrinsic viscosity of 0.70dl/g were selected. Specific values are shown in Table 5.
TABLE 5
Example 15
The side-by-side type composite fiber is prepared by a melting method, and composite spinning is carried out on polybutylene terephthalate with the intrinsic viscosity of 1.05dl/g and cationic dyeable copolyester with the intrinsic viscosity of 0.60dl/g and the S element content of 0.40 wt%, wherein the intrinsic viscosity difference is 0.45 dl/g. Drying respectively to make the water content less than 80ppm, and respectively putting the dried polybutylene terephthalate and cationic dye dyeable copolyester into A, B screws for extrusion according to the weight ratio of 50: 50. The temperature of the screw A is 260 ℃, the temperature of the screw B is 275 ℃, and the temperature of a spinning manifold is 280 ℃. Spinning is carried out by using a side-by-side spinneret. Setting the winding speed to 2500m/min to obtain the pre-oriented yarn with the variety of 150T-24 f.
And false twisting the coiled pre-oriented yarn, wherein the temperature of a false twisting hot needle is 90 ℃, the temperature of a hot box is 150 ℃, the extension multiplying power of the hot needle is 1.60 times, the extension multiplying power of the hot box is 1.0 time, and the total extension multiplying power is 1.60 times. The processing speed was 500 m/min. The final DTY variety is 84T-24 f.
The physical properties of the obtained DTY were measured, and specific numerical values are shown in Table 6.
Example 16
Selecting polybutylene terephthalate with the intrinsic viscosity of 1.30dl/g and cationic dye with the intrinsic viscosity of 0.50dl/g to dye copolyester, wherein the temperature of a screw A is 280 ℃, the temperature of a screw B is 270 ℃, and the temperature of a spinning box body is 280 ℃. Otherwise, the composite spinning was carried out in the same manner as in example 15. Specific values are shown in Table 6.
Example 17
Selecting polybutylene terephthalate with the intrinsic viscosity of 1.55dl/g and cationic dye dyeable copolyester with the intrinsic viscosity of 0.45dl/g, wherein the temperature of a screw A is 285 ℃, the temperature of a screw B is 270 ℃, and the temperature of a spinning manifold is 285 ℃. Otherwise, the composite spinning was carried out in the same manner as in example 15. Specific values are shown in Table 6.
Comparative example 5
Selecting polybutylene terephthalate with the intrinsic viscosity of 0.90dl/g and cationic dye with the intrinsic viscosity of 0.50dl/g to dye copolyester, wherein the temperature of a screw A is 260 ℃, the temperature of a screw B is 270 ℃, and the temperature of a spinning box body is 270 ℃. Otherwise, the composite spinning was carried out in the same manner as in example 15. Specific values are shown in Table 6.
TABLE 6
Example 18
The compounding weight ratio of polybutylene terephthalate and cationic dye dyeable copolyester is 70: 30, and other compounding spinning is carried out in the same way as in example 12. Specific values are shown in Table 7.
Example 19
The compounding weight ratio of polybutylene terephthalate and cationic dye dyeable copolyester is 30: 70, and other compounding spinning is carried out in the same way as in example 12. Specific values are shown in Table 7.
Comparative example 6
The compounding weight ratio of polybutylene terephthalate and cationic dye dyeable copolyester is 80: 20, and other steps are carried out for compound spinning as in example 12. Specific values are shown in Table 7.
Comparative example 7
The compounding weight ratio of polybutylene terephthalate and cationic dye dyeable copolyester is 20: 80, and other compounding spinning is carried out in the same way as in example 12. Specific values are shown in Table 7.
TABLE 7
Example 20
The side-by-side type composite fiber is prepared by a melting method, and composite spinning is carried out on polybutylene terephthalate with the intrinsic viscosity of 1.10dl/g and cationic dyeable copolyester with the intrinsic viscosity of 0.50dl/g and the S element content of 0.20 wt%, wherein the intrinsic viscosity difference is 0.60 dl/g. Drying respectively to make the water content less than 80ppm, and respectively putting the dried polybutylene terephthalate and cationic dye dyeable copolyester into A, B screws for extrusion according to the weight ratio of 50: 50. The temperature of the screw A is 260 ℃, the temperature of the screw B is 270 ℃, and the temperature of the spinning manifold is 275 ℃. Spinning is carried out by using a side-by-side spinneret. Setting the winding speed to 2500m/min to obtain the pre-oriented yarn with the variety of 150T-24 f. Specific values are shown in Table 8.
Example 21
Cationic dye dyeable copolyester with the S element content of 0.90 wt% is selected, and composite spinning is carried out in the same manner as in example 20. Specific values are shown in Table 8.
TABLE 8
Example 22
The melt process of preparing elastic bicomponent fiber includes compounding and spinning polybutylene terephthalate with intrinsic viscosity of 1.8dl/g and polyethylene terephthalate with intrinsic viscosity of 0.51dl/g, and has intrinsic viscosity difference of 1.29 dl/g. Drying respectively to make the water content less than 100ppm, and putting the dried polybutylene terephthalate and polyethylene terephthalate into No. 1/No. 2 spinning boxes respectively according to the weight ratio of 50: 50. Setting the spinning temperature, wherein the temperature of a No. 1 extruder screw is 265 ℃; the screw temperature of the No. 2 spinning machine is 285 ℃; the spinning beam temperature was 285 ℃. Spinning is carried out by using a parallel spinneret, the winding speed is set to 2500m/min, and the variety of the protofilament is controlled to be 300 dtex/48F.
The wound pre-oriented yarn is subjected to false twisting by a false twisting disk, the temperature of a hot box is 190 ℃, the false twisting multiplying power is set to be 1.80, and the extension speed is 500 m/min. The final DTY variety is 167dtex/48F, and the filament number is 3.48 dtex.
The DTY yarn after false twisting was measured for strength, elongation, elastic elongation, and elastic recovery. Specific values are shown in Table 9.
Example 23
The melt process for preparing the bicomponent elastic fiber comprises selecting polybutylene terephthalate with intrinsic viscosity of 2.0dl/g and polyethylene terephthalate with intrinsic viscosity of 0.51dl/g for composite spinning, otherwise as in example 22, the specific values are shown in Table 9.
Comparative example 8
The melt method is used for preparing the bi-component elastic fiber, and the polybutylene terephthalate with the intrinsic viscosity of 1.31dl/g and the polyethylene terephthalate with the intrinsic viscosity of 0.51dl/g are selected for composite spinning, and the intrinsic viscosity difference is 0.80 dl/g. Drying respectively to make the water content less than 100ppm, and putting the dried polybutylene terephthalate and polyethylene terephthalate into No. 1/No. 2 spinning boxes respectively according to the weight ratio of 50: 50. Setting the spinning temperature, wherein the temperature of a No. 1 extruder screw is 265 ℃; the screw temperature of the No. 2 spinning machine is 285 ℃; the spinning beam temperature was 270 ℃. Spinning is carried out by using a parallel spinneret, the winding speed is set to 2500m/min, and the variety of the protofilament is controlled to be 300 dtex/48F.
The wound pre-oriented yarn is subjected to false twisting disc false twisting, the temperature of a hot needle behind a yarn feeding roller on a false twisting machine is set to be 80 ℃, the temperature of a hot box is 190 ℃, the extension ratio at the hot needle is set to be 1.85, the extension ratio at the hot box is set to be 1.0, the total extension ratio is 1.85, and the extension speed is 500 m/min. The final DTY variety is 167dtex/48F, and the filament number is 3.48 dtex.
The DTY yarn after false twisting was measured for strength, elongation, elastic elongation, and elastic recovery. Specific values are shown in Table 9.
TABLE 9
| Item | Unit of | Example 22 | Example 23 | Comparative example 8 |
| Variety of POY | - | 300dtex-48F | 300dtex-48F | 300dtex-48F |
| Intrinsic viscosity of PBT | dl/g | 1.80 | 2.00 | 1.31 |
| Intrinsic viscosity of PET | dl/g | 0.51 | 0.51 | 0.51 |
| Difference in intrinsic viscosity | dl/g | 1.29 | 1.49 | 0.80 |
| Mass ratio of PBT/PET | - | 50/50 | 50/50 | 50/50 |
| PBT spinning temperature | ℃ | 265 | 265 | 265 |
| Spinning temperature of PET | ℃ | 285 | 285 | 285 |
| Spinning speed | m/min | 2500 | 2500 | 2500 |
| Variety DTY | - | 167dtex-48F | 167dtex-48F | 167dtex-48F |
| Fineness of single filament | dtex | 3.48 | 3.48 | 3.48 |
| DTY multiplying power (Hot needle/hot box) | - | 1.85 | 1.85 | 1.85/1.0 |
| False twisting method | - | False twisting disk | False twisting disk | External drafting |
| Hot needle/hot box temperature | ℃ | No/190 | No/190 | 80/190 |
| Speed of processing | m/min | 500 | 500 | 500 |
| DTY intensity | cN/dtex | 3.45 | 3.60 | 3.30 |
| DTY elongation | ％ | 21.0 | 20.4 | 22.6 |
| DTY elastic elongation | ％ | 120 | 129 | 187.5 |
| DTY elastic recovery | ％ | 90.0 | 93.0 | 90.2 |
| Cross-sectional shape | - | Circular shape | Circular shape | Circular shape |
Claims (5)
1. A side-by-side type composite fiber is characterized in that: the fiber is prepared by carrying out parallel composite spinning on polybutylene terephthalate with the intrinsic viscosity of 1.00-1.50 dl/g and cationic dyeable polyester with the intrinsic viscosity of 0.45-0.65 dl/g according to the weight ratio of 70: 30-30: 70 and then carrying out false twisting processing; wherein the intrinsic viscosity difference between the polybutylene terephthalate and the cationic dye dyeable polyester is 0.4-1.05 dl/g, the elastic elongation of the fiber is 25-100%, and the elastic recovery rate is more than 85%.
2. The side-by-side composite fiber according to claim 1, wherein: the fiber has a single fiber fineness of 0.45 to 7.00 dtex.
3. The side-by-side composite fiber according to claim 1, wherein: the cationic dyeable copolyester contains a structural unit formed by isophthalic acid or a derivative thereof with sodium sulfonate groups, and the structural unit accounts for 0.20-1.00 wt% of the cationic dyeable copolyester by sulfur element.
4. The side-by-side composite fiber according to claim 3, wherein: the isophthalic acid or the derivative thereof with sodium sulfonate groups is isophthalic acid-5-sodium sulfonate, dimethyl isophthalate-5-sodium sulfonate or ethylene glycol isophthalate-5-sodium sulfonate.
5. The side-by-side composite fiber according to claim 4, wherein: the fiber has a color development L value of 16.0 or less after cationic dyeing.
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| CN201610340779.0A CN107419363A (en) | 2016-05-23 | 2016-05-23 | A kind of parallel composite fiber |
| CN201610773951.1A CN107779987A (en) | 2016-08-31 | 2016-08-31 | A kind of parallel composite elastic fiber and its manufacture method |
| CN2016107739511 | 2016-08-31 | ||
| PCT/CN2017/085260 WO2017202262A1 (en) | 2016-05-23 | 2017-05-22 | Parallel composite fibre |
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| TWI760130B (en) * | 2021-03-05 | 2022-04-01 | 新光合成纖維股份有限公司 | High color fastness bicomponent composite fiber, yarn and fabric made from the same |
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| CN108138379A (en) | 2018-06-08 |
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