CN111206300A - Elastic composite fiber and preparation method thereof - Google Patents
Elastic composite fiber and preparation method thereof Download PDFInfo
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- CN111206300A CN111206300A CN201811402195.7A CN201811402195A CN111206300A CN 111206300 A CN111206300 A CN 111206300A CN 201811402195 A CN201811402195 A CN 201811402195A CN 111206300 A CN111206300 A CN 111206300A
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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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- 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
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
- D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
Abstract
The invention discloses an elastic composite fiber, which has a cross section in a parallel composite structure and is formed by respectively extruding and compounding water-absorbing modified PET and PTT at a mass ratio of 48-52: 52-48. The elastic composite fiber has excellent water absorption and quick drying performance and soft hand feeling, the parallel composite fiber has good moisture conducting and quick drying performance due to the grooves formed between the two components along the fiber extension direction, the breaking strength is more than or equal to 2.8cN/dtex, the elongation at break is 24-30%, the composite elastic fiber has high crimpability and bulkiness similar to wool, and is suitable for being applied to close-fitting clothes, the application of the elastic composite fiber is expanded, and the crimpness rate is 40-45%. The elastic elongation of the fabric is more than or equal to 25 percent, the elastic recovery rate is more than or equal to 98 percent, the water absorption is that the drip diffusion time is less than 1s, and the time required for the diffusible residual moisture rate to be 10 percent is less than or equal to 50 min.
Description
Technical Field
The invention belongs to the technical field of elastic fibers and processing thereof, and particularly relates to an elastic composite fiber and a preparation method thereof.
Background
With the improvement of science and technology and the improvement of living standard of people, the requirements of people on the wearing comfort and the functionality of clothes are higher and higher, and on one hand, the elastic fiber receives wide attention of people due to excellent elasticity and elastic resilience. The polyester elastic fiber comprises polyester single-component and two-component composite elastic fiber, and has excellent dyeing property, high temperature resistance, corrosion resistance and the like compared with polyurethane elastic fiber, so that the polyester elastic fiber has wide application fields and is developed rapidly in recent years. On the other hand, elastic fibers are developing toward functionalization such as antibiosis, antistatic, moisture absorption and quick drying.
The hydrophilic moisture-conducting modification of polyester and fiber thereof is mainly realized by adding organic modifier and inorganic modifier, wherein the organic modifier comprises diethylene glycol isophthalate-5-sodium sulfonate, polyurethane, straight-chain aliphatic polyether, cellulose acetate butyrate, hydroxyl olefin and derivatives thereof and the like, and the inorganic modifier comprises calcium carbonate, barium sulfate, kaolin and the like. CN102926023 and CN103183815A disclose only one kind of hydrophilic property of polyester and fiber, and do not relate to the quick drying property of fiber. CN104451936 discloses an optical shielding hydrophilic fiber and a preparation method thereof, wherein the moisture regain of drawn yarns prepared from aliphatic polyamide is up to 2.8%, but the thermal oxygen stability of products added with the aliphatic polyamide is greatly influenced. The selection of the hydrophilic modifier and the crosslinking agent and the addition method of CN1135494A seriously affect the thermal stability, spinnability and fiber formability of the polymer.
CN1646741A discloses an elastic fiber with moisture absorption and heat release functions, which is mainly used for manufacturing winter clothes with light weight and high heat preservation, such as sportswear, underwear, stockings and the like. CN104831417A discloses a polyester elastomer/PET composite elastic fiber and a preparation method thereof, the fiber prepared by the method has a crimp degree of 60-75%, the crimp elastic rate is 97-99%, and the water absorption height of the fabric is 9.7-14.1 cm/30 min. The fiber prepared by the technical scheme disclosed in CN104726947A has poor elasticity and elastic recovery, and the water absorption quick-drying test data of the fiber are not disclosed. Therefore, a method for preparing an elastic composite fiber having an excellent water-absorbing and quick-drying function has not been disclosed so far.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an elastic composite fiber.
Another object of the present invention is to provide a method for preparing the elastic conjugate fiber.
Still another object of the present invention is to provide a water-absorbent modified PET.
The invention also aims to provide a preparation method of the water-absorbing modified PET.
The technical scheme of the invention is as follows:
an elastic composite fiber, the cross section of which is of a parallel composite structure, is formed by extruding and compounding water-absorbing modified PET and PTT respectively according to the mass ratio of 48-52: 48-52;
the water-absorbing modified PET has the intrinsic viscosity of 0.4-0.55 dl/g, the terminal carboxyl group content of 20-30 mol/t, the melting point of 240-250 ℃, the chroma b value of 5-7 and the water absorption rate of more than or equal to 4.0%; and is prepared by esterification of terephthalic acid, ethylene glycol and isosorbide, and polycondensation reaction of polyethylene glycol, a modified accelerator, trimethyl phosphate, an antioxidant 1425, a delustering agent titanium dioxide and a catalyst ethylene glycol titanium; the structural formula of the modified accelerant is as follows:
the intrinsic viscosity of the PTT is 1.00 to 1.15 dl/g.
In a preferred embodiment of the present invention, the method for preparing the water-absorbing modified PET comprises: weighing terephthalic acid, ethylene glycol and isosorbide with the acid-alcohol molar ratio of 1: 1.2-1.4, and adding the terephthalic acid, the ethylene glycol and the isosorbide into a reaction kettle to perform esterification reaction, wherein the temperature of the esterification reaction is 245-260 ℃, the pressure of the esterification reaction is micro positive pressure of 0.018-0.021 MPa, the esterification rate reaches more than 98%, and esterification is completed to obtain an esterified substance; adding polyethylene glycol, a modification promoter, trimethyl phosphate, an antioxidant 1425 and a delustering agent titanium dioxide into the esterified product in sequence, balancing for 25-40min, adding a catalyst of ethylene glycol titanium, heating and vacuumizing to perform polycondensation reaction on the esterified product under a vacuum condition, stopping the reaction when the stirring current and the online viscosity value reach preset values, and extruding and pelletizing to obtain the water-absorbing modified PET.
In a preferred embodiment of the present invention, the polyethylene glycol has a molecular weight of 5400 to 6600.
More preferably, the addition amount of the polyethylene glycol is 4 to 10%, the addition amount of the modification promoter is 0.05 to 0.8%, the addition amount of the isosorbide is 0.05 to 1.0%, the addition amount of the titanium dioxide is 0.3%, the addition amount of the catalyst titanium glycolate is 30 to 60ppm, the addition amount of the trimethyl phosphate is 100 to 200ppm, and the addition amount of the antioxidant 1425 is 1000 to 3000ppm based on the mass of the theoretically-produced polyester.
The other technical scheme of the invention is as follows:
a method for preparing the elastic composite fiber comprises the following steps:
respectively carrying out melt extrusion on the water-absorbing modified PET and PTT slices which are pre-crystallized and dried by respective screw extruders according to the mass ratio of 50: 50, feeding the melt-extruded slices into a spinning assembly through respective melt pipelines, carrying out composite extrusion at a spinneret plate, carrying out air blowing cooling, oiling and winding to obtain parallel composite pre-oriented yarns, and carrying out false twisting processing to obtain the elastic composite fiber; wherein the temperature of the spinning component of the water-absorbing modified PET is 260-280 ℃, the temperature of the spinning component of the PTT is 250-270 ℃, and the spinning speed is 2500-3000 m/min; the temperature of the first hot box for false twisting is 160-170 ℃, the drafting ratio is 1.75-1.83, and the processing speed is 500-700 m/min.
The invention adopts another technical scheme as follows:
the water-absorbing modified PET has the intrinsic viscosity of 0.4-0.55 dl/g, the terminal carboxyl group content of 20-30 mol/t, the melting point of 240-250 ℃, the chroma b value of 5-7 and the water absorption rate of more than or equal to 4.0%; and is prepared by esterification of terephthalic acid, ethylene glycol and isosorbide, and polycondensation reaction of polyethylene glycol, a modified accelerator, trimethyl phosphate, an antioxidant 1425, a delustering agent titanium dioxide and a catalyst ethylene glycol titanium; the structural formula of the modified accelerant is as follows:
in a preferred embodiment of the present invention, the polyethylene glycol has a molecular weight of 5400 to 6600.
More preferably, the addition amount of the polyethylene glycol is 4 to 10%, the addition amount of the modification promoter is 0.05 to 0.8%, the addition amount of the isosorbide is 0.05 to 1.0%, the addition amount of the titanium dioxide is 0.3%, the addition amount of the catalyst titanium glycolate is 30 to 60ppm, the addition amount of the trimethyl phosphate is 100 to 200ppm, and the addition amount of the antioxidant 1425 is 1000 to 3000ppm based on the mass of the theoretically-produced polyester.
The invention also provides another technical scheme as follows:
a preparation method of the water-absorbing modified PET comprises the following steps: weighing terephthalic acid, ethylene glycol and isosorbide with the acid-alcohol molar ratio of 1: 1.2-1.4, and adding the terephthalic acid, the ethylene glycol and the isosorbide into a reaction kettle to perform esterification reaction, wherein the temperature of the esterification reaction is 245-260 ℃, the pressure of the esterification reaction is micro positive pressure of 0.018-0.021 MPa, the esterification rate reaches more than 98%, and esterification is completed to obtain an esterified substance; adding polyethylene glycol, a modification promoter, trimethyl phosphate, an antioxidant 1425 and a delustering agent titanium dioxide into the esterified product in sequence, balancing for 25-40min, adding a catalyst of ethylene glycol titanium, heating and vacuumizing to perform polycondensation reaction on the esterified product under a vacuum condition, stopping the reaction when the stirring current and the online viscosity value reach preset values, and extruding and pelletizing to obtain the water-absorbing modified PET.
The invention has the beneficial effects that:
1. the elastic composite fiber has excellent water absorption and quick drying performance and soft hand feeling, the parallel composite fiber has good moisture conducting and quick drying performance due to the grooves formed between the two components along the fiber extension direction, the breaking strength is not less than 2.8cN/dtex, the elongation at break is 24-30%, the composite elastic fiber has high crimpability and bulkiness similar to wool, and is suitable for the application of close-fitting clothes, the application of the elastic composite fiber is expanded, and the crimp rate is 40-45%. The elastic elongation of the fabric is more than or equal to 25 percent, the elastic recovery rate is more than or equal to 98 percent, the water absorption is that the drip diffusion time is less than 1s, and the time required for the diffusible residual moisture rate to be 10 percent is less than or equal to 50 min.
2. The water-absorbing modified PET has excellent spinnability, water absorption and thermal stability.
Detailed Description
The technical solution of the present invention is further illustrated and described by the following detailed description.
In the following examples, the structural formula of the modification promoter is:
Example 1
(1) Preparing a water-absorbing modified PET slice: weighing terephthalic acid, ethylene glycol and isosorbide with the acid-alcohol molar ratio of 1: 1.35, adding the terephthalic acid, the ethylene glycol and the isosorbide into a reaction kettle for esterification reaction, wherein the addition amount of the isosorbide is 0.5%, the esterification temperature is 252 ℃, the esterification pressure is micro-positive pressure of 0.02MPa, the esterification rate reaches more than 98%, after the esterification is completed, adding 6% of polyethylene glycol, 0.1% of a modification promoter, 100ppm of trimethyl phosphate, 1500ppm of an antioxidant 1425 and 0.3% of a flatting agent titanium dioxide into the esterified product in sequence, balancing for 30min, adding 40ppm of catalyst ethylene glycol titanium, heating to 278 ℃, vacuumizing to ensure that the vacuum degree is below 80Pa, carrying out polycondensation reaction on the esterified product under the vacuum condition, stopping the reaction after the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the water-absorbing modified PET.
(1) Preparing elastic composite fiber: and respectively carrying out melt extrusion on the pre-crystallized and dried water-absorbing modified PET and PTT slices in a mass ratio of 50: 50 by respective screw extruders, feeding the melt extruded slices into a spinning assembly through respective melt pipelines, carrying out composite extrusion at a spinneret plate, carrying out air blowing cooling, oiling and winding to obtain parallel composite pre-oriented yarns, and carrying out false twisting processing to obtain the elastic composite fiber. The intrinsic viscosity of PTT is 1.00dl/g, the spinning beam temperature of the spinning assembly of the water-absorbing modified PET is 275 ℃, the spinning beam temperature of the spinning assembly of the PTT is 262 ℃, and the spinning speed is 2700 m/min. The temperature of the first heat box for false twisting is 165 ℃, the drafting ratio is 1.78, and the processing speed is 600 m/min.
Example 2
(1) Preparing a water-absorbing modified PET slice: weighing terephthalic acid, ethylene glycol and isosorbide with the acid-alcohol molar ratio of 1: 1.2, adding the terephthalic acid, the ethylene glycol and the isosorbide into a reaction kettle for esterification reaction, wherein the addition amount of the isosorbide is 0.3%, the esterification temperature is 248 ℃, the esterification pressure is micro-positive pressure of 0.02MPa, the esterification rate reaches more than 98%, after the esterification is completed, adding 7% of polyethylene glycol, 0.1% of a modification promoter, 150ppm of trimethyl phosphate, 2500ppm of an antioxidant 1425 and 0.3% of a flatting agent titanium dioxide into the esterified product in sequence, balancing for 30min, adding 30ppm of catalyst ethylene glycol titanium, heating to 276 ℃, vacuumizing to ensure that the vacuum degree is below 80Pa, carrying out polycondensation reaction on the esterified product under the vacuum condition, stopping the reaction after the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the water-absorbing modified PET.
(2) Preparing elastic composite fiber: and respectively carrying out melt extrusion on the pre-crystallized and dried water-absorbing modified PET and PTT slices in a mass ratio of 50: 50 by respective screw extruders, feeding the melt extruded slices into a spinning assembly through respective melt pipelines, carrying out composite extrusion at a spinneret plate, carrying out air blowing cooling, oiling and winding to obtain parallel composite pre-oriented yarns, and carrying out false twisting processing to obtain the elastic composite fiber. The intrinsic viscosity of PTT is 1.10dl/g, the spinning beam temperature of the spinning assembly of the water-absorbing modified PET is 273 ℃, the spinning beam temperature of the spinning assembly of the PTT is 262 ℃, and the spinning speed is 2700 m/min. The temperature of the first heat box for false twisting is 165 ℃, the drafting ratio is 1.76, and the processing speed is 700 m/min.
Example 3
(1) Preparing a water-absorbing modified PET slice: weighing terephthalic acid, ethylene glycol and isosorbide with the acid-alcohol molar ratio of 1: 1.2, adding the terephthalic acid, the ethylene glycol and the isosorbide into a reaction kettle for esterification reaction, wherein the addition amount of the isosorbide is 0.1%, the esterification temperature is 250 ℃, the esterification pressure is micro-positive pressure of 0.02MPa, the esterification rate reaches more than 98%, after esterification is completed, adding 9% of polyethylene glycol, 0.8% of modification promoter, 150ppm of trimethyl phosphate, 2800ppm of antioxidant 1425 and 0.3% of flatting agent titanium dioxide into the esterified product in sequence, balancing for 10min, adding 50ppm of catalyst ethylene glycol titanium, heating to 278 ℃, vacuumizing to ensure that the vacuum degree is below 80Pa, carrying out polycondensation reaction on the esterified product under the vacuum condition, stopping the reaction after the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the water-absorbing modified PET.
(2) Preparing elastic composite fiber: the pre-crystallized and dried water-absorbing modified PET and PTT granules are respectively melted and extruded by respective screw extruders according to the mass ratio of 50: 50, enter a spinning assembly through respective melt pipelines, are compositely extruded at a spinneret plate, are subjected to air blowing and cooling, are oiled and wound to obtain parallel composite pre-oriented yarns, and are subjected to false twisting to obtain the elastic composite fiber. The intrinsic viscosity of PTT is 1.05dl/g, the spinning beam temperature of the spinning component of the water absorption modified PET is 276 ℃, the spinning beam temperature of the spinning component of the PTT is 264 ℃, and the spinning speed is 2800 m/min. The temperature of the first heat box for false twisting was 165 ℃, the draw ratio was 1.82, and the processing speed was 550 m/min.
Example 4
(1) Preparing a water-absorbing modified PET slice: weighing terephthalic acid, ethylene glycol and isosorbide with the acid-alcohol molar ratio of 1: 1.4, adding the terephthalic acid, the ethylene glycol and the isosorbide into a reaction kettle for esterification reaction, wherein the addition amount of the isosorbide is 0.8%, the esterification temperature is 255 ℃, the esterification pressure is micro-positive pressure of 0.02MPa, the esterification rate reaches more than 98%, after the esterification is completed, adding 4% of polyethylene glycol, 0.06% of modification promoter, 80ppm of trimethyl phosphate, 1000ppm of antioxidant 1425 and 0.3% of flatting agent titanium dioxide into the esterified product in sequence, after balancing for 30min, adding 60ppm of catalyst ethylene glycol titanium, heating to 278 ℃, simultaneously vacuumizing to ensure that the vacuum degree is below 80Pa, carrying out polycondensation reaction on the esterified product under the vacuum condition, stopping the reaction after the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the water-absorbing modified PET.
(2) Preparing elastic composite fiber: the pre-crystallized and dried water-absorbing modified PET and PTT granules are respectively melted and extruded by respective screw extruders according to the mass ratio of 50: 50, enter a spinning assembly through respective melt pipelines, are compositely extruded at a spinneret plate, are subjected to air blowing and cooling, are oiled and wound to obtain parallel composite pre-oriented yarns, and are subjected to false twisting to obtain the elastic composite fiber. The intrinsic viscosity of PTT is 1.15dl/g, the spinning beam temperature of the spinning component of the water absorption modified PET is 276 ℃, the spinning beam temperature of the spinning component of the PTT is 264 ℃, and the spinning speed is 2550 m/min. The temperature of the first heat box for false twisting is 165 ℃, the drafting ratio is 1.80, and the processing speed is 600 m/min.
The following description is given of the method for detecting the water-absorbent modified PET chips and the elastic composite fibers obtained in the above examples:
1. the intrinsic viscosity, melting point, carboxyl end group and chromaticity of the water-absorbing modified PET slice are tested according to the national standard GB/T14190-2008. Water absorption testing of the sections was carried out in accordance with the standard GB/T21655.1-2008.
2. The fineness test of the elastic composite fiber is carried out according to the national standard GB/T14343-2008, and the breaking strength and breaking elongation test is carried out according to the standard GB/T14344-2008.
3. The crimp rate test of the elastic composite fiber is carried out according to the standard GB/T6506-2001.
4. Elastic elongation and elastic recovery testing of elastic composite fiber fabrics is performed according to the standard ASTM D3107.
5. Water absorption of elastic conjugate fiber Fabric test reference standard JIS-L-1907, and test time required for 10% of diffusion residual moisture content with a water dropping amount of 0.6 mL.
The main performance test indexes of the water-absorbent modified PET chips prepared in examples 1 to 4 are shown in Table 1, and the main performance test indexes of the elastic composite fibers and fabrics thereof prepared are shown in Table 2.
TABLE 1 Performance index of Water-absorbent modified PET chips obtained in examples 1 to 4
TABLE 2 Performance index of elastic conjugate fiber obtained in examples 1 to 4
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims.
Claims (9)
1. An elastic conjugate fiber characterized by: the cross section of the PET-PTT composite material is of a parallel composite structure, and the PET-PTT composite material is formed by extruding and compounding water-absorbing modified PET and PTT respectively according to the mass ratio of 48-52: 52-48;
the water-absorbing modified PET has the intrinsic viscosity of 0.4-0.55 d1/g, the carboxyl end group content of 20-30 mol/t, the melting point of 240-250 ℃, the chroma b value of 5-7 and the water absorption rate of more than or equal to 4.0%; and is prepared by esterification of terephthalic acid, ethylene glycol and isosorbide, and polycondensation reaction of polyethylene glycol, a modified accelerator, trimethyl phosphate, an antioxidant 1425, a delustering agent titanium dioxide and a catalyst ethylene glycol titanium; the structural formula of the modified accelerant is as follows:
the intrinsic viscosity of the PTT is 1.00 to 1.15 dl/g.
2. An elastic composite fiber according to claim 1, wherein: the preparation method of the water-absorbing modified PET comprises the following steps: weighing terephthalic acid, ethylene glycol and isosorbide with the acid-alcohol molar ratio of 1: 1.2-1.4, and adding the terephthalic acid, the ethylene glycol and the isosorbide into a reaction kettle to perform esterification reaction, wherein the temperature of the esterification reaction is 245-260 ℃, the pressure of the esterification reaction is micro positive pressure of 0.018-0.021 MPa, the esterification rate reaches more than 98%, and esterification is completed to obtain an esterified substance; adding polyethylene glycol, a modification promoter, trimethyl phosphate, an antioxidant 1425 and a delustering agent titanium dioxide into the esterified product in sequence, balancing for 25-40min, adding a catalyst of ethylene glycol titanium, heating and vacuumizing to perform polycondensation reaction on the esterified product under a vacuum condition, stopping the reaction when the stirring current and the online viscosity value reach preset values, and extruding and pelletizing to obtain the water-absorbing modified PET.
3. An elastic composite fiber according to claim 1, wherein: the molecular weight of the polyethylene glycol is 5400-6600.
4. An elastic composite fibre according to any one of claims 1 to 3, wherein: based on the mass of the theoretically produced polyester, the addition amount of polyethylene glycol is 4-10%, the addition amount of a modification promoter is 0.05-0.8%, the addition amount of isosorbide is 0.05-1.0%, the addition amount of titanium dioxide is 0.3%, the addition amount of a catalyst titanium glycolate is 30-60 ppm, the addition amount of trimethyl phosphate is 100-200 ppm, and the addition amount of an antioxidant 1425 is 1000-3000 ppm.
5. A method of producing an elastic composite fiber according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
respectively carrying out melt extrusion on the water-absorbing modified PET and PTT slices which are pre-crystallized and dried by respective screw extruders in a mass ratio of 48-52: 52-48, feeding the melt-extruded PET and PTT slices into a spinning assembly through respective melt pipelines, carrying out composite extrusion at a spinneret plate, carrying out air blowing cooling, oiling and winding to obtain parallel composite pre-oriented yarns, and carrying out false twisting processing to obtain the elastic composite fibers; wherein the content of the first and second substances,
the temperature of the spinning component of the water-absorbing modified PET is 260-280 ℃, the temperature of the spinning component of the PTT is 250-270 ℃, and the spinning speed is 2500-3000 m/min; the temperature of the first hot box for false twisting is 160-170 ℃, the drafting ratio is 1.75-1.83, and the processing speed is 500-700 m/min.
6. A water-absorbing modified PET is characterized in that: the intrinsic viscosity is 0.4-0.55 dl/g, the content of terminal carboxyl is 20-30 mol/t, the melting point is 240-250 ℃, the chroma b value is 5-7, and the water absorption rate is more than or equal to 4.0%; and is prepared by esterification of terephthalic acid, ethylene glycol and isosorbide, and polycondensation reaction of polyethylene glycol, a modified accelerator, trimethyl phosphate, an antioxidant 1425, a delustering agent titanium dioxide and a catalyst ethylene glycol titanium; the structural formula of the modified accelerant is as follows:
7. the water-absorbing modified PET of claim 6, wherein: the molecular weight of the polyethylene glycol is 5400-6600.
8. The water-absorbing modified PET as claimed in claim 6 or 7, wherein: based on the mass of the theoretically produced polyester, the addition amount of polyethylene glycol is 4-10%, the addition amount of a modification promoter is 0.05-0.8%, the addition amount of isosorbide is 0.05-1.0%, the addition amount of titanium dioxide is 0.3%, the addition amount of a catalyst titanium glycolate is 30-60 ppm, the addition amount of trimethyl phosphate is 100-200 ppm, and the addition amount of an antioxidant 1425 is 1000-3000 ppm.
9. A method for preparing the water-absorbing modified PET as claimed in any one of claims 6 to 8, characterized in that: the method comprises the following steps: weighing terephthalic acid, ethylene glycol and isosorbide with the acid-alcohol molar ratio of 1: 1.2-1.4, and adding the terephthalic acid, the ethylene glycol and the isosorbide into a reaction kettle to perform esterification reaction, wherein the temperature of the esterification reaction is 245-260 ℃, the pressure of the esterification reaction is micro positive pressure of 0.018-0.021 MPa, the esterification rate reaches more than 98%, and esterification is completed to obtain an esterified substance; adding polyethylene glycol, a modification promoter, trimethyl phosphate, an antioxidant 1425 and a delustering agent titanium dioxide into the esterified product in sequence, balancing for 25-40min, adding a catalyst of ethylene glycol titanium, heating and vacuumizing to perform polycondensation reaction on the esterified product under a vacuum condition, stopping the reaction when the stirring current and the online viscosity value reach preset values, and extruding and pelletizing to obtain the water-absorbing modified PET.
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| CN111733470A (en) * | 2020-06-12 | 2020-10-02 | 温州大学 | Self-crimping composite moisture absorption fiber, preparation method and fabric |
| CN112538662A (en) * | 2020-11-09 | 2021-03-23 | 江苏新视界先进功能纤维创新中心有限公司 | High-elasticity moisture-absorption antistatic PTT/PET composite fiber and preparation method thereof |
| CN112626628A (en) * | 2020-11-09 | 2021-04-09 | 江苏新视界先进功能纤维创新中心有限公司 | Functional composite fiber with controllable crimpness and preparation method thereof |
| CN112680828A (en) * | 2020-12-14 | 2021-04-20 | 浙江理工大学 | Preparation method of self-crimping fiber |
| CN112708947A (en) * | 2020-12-14 | 2021-04-27 | 浙江理工大学 | Preparation method of self-crimping fiber with recycled polyester as raw material |
| CN115299318A (en) * | 2022-08-09 | 2022-11-08 | 中奥生态环境股份有限公司 | Bio-based fiber soil for soil remediation |
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| CN112626628A (en) * | 2020-11-09 | 2021-04-09 | 江苏新视界先进功能纤维创新中心有限公司 | Functional composite fiber with controllable crimpness and preparation method thereof |
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| CN112708947A (en) * | 2020-12-14 | 2021-04-27 | 浙江理工大学 | Preparation method of self-crimping fiber with recycled polyester as raw material |
| CN115299318A (en) * | 2022-08-09 | 2022-11-08 | 中奥生态环境股份有限公司 | Bio-based fiber soil for soil remediation |
| CN115299318B (en) * | 2022-08-09 | 2023-12-01 | 中奥生态环境股份有限公司 | Bio-based fiber soil for soil remediation |
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