CN111206299B - Parallel composite elastic fiber and preparation method thereof - Google Patents
Parallel composite elastic fiber and preparation method thereof Download PDFInfo
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- CN111206299B CN111206299B CN201811402191.9A CN201811402191A CN111206299B CN 111206299 B CN111206299 B CN 111206299B CN 201811402191 A CN201811402191 A CN 201811402191A CN 111206299 B CN111206299 B CN 111206299B
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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
- D02G1/0206—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 by false-twisting
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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
- D02G1/0286—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 characterised by the use of certain filaments, fibres or yarns
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Abstract
The invention discloses a parallel composite elastic fiber and a preparation method thereof, wherein the cross section is of a peanut type parallel structure, and the parallel composite elastic fiber is prepared by extruding 2,6-naphthalenedicarboxylic acid copolymerization modified PET and 2,6-naphthalenedicarboxylic acid copolymerization modified PTT respectively in a mass ratio of 45-55: 55-45 and then compounding. The side-by-side composite elastic fiber prepared by the invention has excellent elasticity and elastic recovery, the breaking strength is more than or equal to 3.5cN/dtex, the elongation at break is 22-35%, the fiber has high crimpability and fluffiness similar to wool, the crimp rate is 40-45%, the elastic elongation of the fabric is more than or equal to 28%, and the elastic recovery is more than or equal to 95%.
Description
Technical Field
The invention belongs to the technical field of composite fibers and processing thereof, and particularly relates to a parallel composite elastic fiber and a preparation method thereof.
Background
Currently, the most well-known spandex belongs to the polyurethane fiber of DuPont, and is highly favored because of its excellent elasticity and elastic recovery. However, polyurethane fibers also have some defects, which have promoted the development of polyester elastic fibers, such as T400 of Invista corporation, which are superior to polyurethane elastic fibers in elastic stability, dyeability, high temperature resistance, alkali resistance and chlorine bleaching resistance.
The bicomponent side-by-side elastic fiber is made of polymers with different shrinkage characteristics, shrinkage heat treatment is carried out after the fiber is formed, the shrinkage difference enables the fiber to generate a permanent three-dimensional spiral three-dimensional curled structure, compared with the conventional fiber, the bicomponent side-by-side elastic fiber has excellent elasticity, the bicomponent side-by-side elastic fiber also has excellent fluffiness and soft hand feeling, and the bicomponent side-by-side elastic fiber is a supplement or even a substitute of polyurethane fiber in many aspects and is rapidly developed in recent years. The currently researched bicomponent elastic fibers mainly comprise the following components: (1) PET/PTT composite fibers such as CN105274637A, CN101974802, CN1280462C and the like; (2) PET/PBT and high-low IV PBT/PBT composite fibers, such as CN101851812 and CN101654814A; (3) High and low IV PET/PET and modified PET/PET, such as CN104141178, CN201420425923, CN103882538B, CN204676206U, CN104831417A, CN101718008A and CN 854355A.
However, the elastic fiber prepared by the prior art has the defects that the PTT or PBT component is seriously thermally degraded in the fiber preparation process, the component period is short, the spinneret plate surface is easy to generate a white powder phenomenon, the spinnability is poor, the breaking strength of a processed fiber product is low, and the fiber elasticity and the elastic resilience are insufficient, so that the application range of the product is greatly limited.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a side-by-side composite elastic fiber.
Another object of the present invention is to provide a method for producing the above side-by-side conjugate elastic fiber.
The technical scheme of the invention is as follows:
a parallel composite elastic fiber with a peanut-shaped parallel structure section is formed by respectively extruding 2,6-naphthalenedicarboxylic acid copolymerization modified PET and 2,6-naphthalenedicarboxylic acid copolymerization modified PTT according to the mass ratio of 45-55: 55-45 and then compounding;
the 2,6-naphthalenedicarboxylic acid copolymerized modified PET has the intrinsic viscosity of 0.53-0.65 dl/g, the content of terminal carboxyl groups of 20-30 mol/t, the melting point of 255-265 ℃ and the chroma b value of 3-6;
the 2,6-naphthalenedicarboxylic acid copolymerization modified PTT has the intrinsic viscosity of 1.05-1.25 dl/g, the content of terminal carboxyl groups of 10-20 mol/t, the melting point of 224-230 ℃ and the chroma b value of 9-11.
In a preferred embodiment of the present invention, the preparation method of 2,6-naphthalenedicarboxylic acid copolymerized modified PET comprises: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol which have the acid-alcohol molar ratio of 1: 1.2-1.4 according to the mass calculation of the 2,6-naphthalenedicarboxylic acid copolymerization modified PET produced theoretically, adding the terephthalic acid, the 2,6-naphthalenedicarboxylic acid and the ethylene glycol into a reaction kettle for esterification reaction, wherein the temperature of the esterification reaction is 245-260 ℃, the pressure of the esterification reaction is micro-positive pressure of 0.02MPa, the esterification rate reaches more than 96%, and esterification is completed to obtain a first esterified substance; adding isosorbide, trimethyl phosphate, an antioxidant 1010, titanium dioxide and a catalyst titanium glycollate into the first esterified substance in sequence, heating and vacuumizing to enable the esterified substance to carry out polycondensation reaction under the vacuum condition, stopping the reaction when the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the 2,6-naphthalenedicarboxylic acid copolymerization modified PET.
More preferably, the addition amount of 2,6-naphthalenedicarboxylic acid is 1-8%, the addition amount of isosorbide is 0.1-0.8%, the addition amount of trimethyl phosphate is 50-200 ppm, the addition amount of ethylene glycol titanium as a catalyst is 30-70 ppm, the addition amount of antioxidant 1010 is 1000-2000 ppm, and the addition amount of titanium dioxide is 0.28-0.31% calculated by the mass of the 2,6-naphthalenedicarboxylic acid copolymerized and modified PET theoretically produced.
In a preferred embodiment of the invention, the preparation method of 2,6-naphthalenedicarboxylic acid copolymerization modified PTT comprises the following steps: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid, 1,3-propanediol and a catalyst tetrabutyl titanate with the acid-alcohol molar ratio of 1: 1.25-1.55 according to the mass calculation of 2,6-naphthalenedicarboxylic acid copolymerization modified PTT produced theoretically, adding the terephthalic acid, the 2,6-naphthalenedicarboxylic acid, the 1,3-propanediol and the catalyst tetrabutyl titanate into a reaction kettle for esterification reaction, wherein the temperature of the esterification reaction is 225-250 ℃, the pressure of the esterification reaction is micro-positive pressure of 0.02MPa, the esterification rate reaches more than 99%, and the second esterified substance is obtained; adding an antioxidant 1076 and titanium dioxide into the second esterified product, heating and vacuumizing to enable the esterified product to carry out polycondensation reaction under the vacuum condition, stopping the reaction when the stirring current and the online viscosity meter value reach preset values, extruding and granulating, and then conveying to a vacuum rotary drum for solid-phase tackifying to obtain the 2,6-naphthalenedicarboxylic acid copolymerization modified PTT.
More preferably, the addition amount of 2,6-naphthalenedicarboxylic acid is 0.5-1.5%, the addition amount of tetrabutyl titanate serving as a catalyst is 25-60 ppm, the addition amount of the antioxidant 1076 is 1000-2000 ppm, and the addition amount of titanium dioxide is 0.28-0.31%, calculated according to the mass of the 2,6-naphthalenedicarboxylic acid copolymerization modified PTT produced theoretically.
A preparation method of the side-by-side composite elastic fiber comprises the following steps:
melting and extruding the 2,6-naphthalenedicarboxylic acid copolymerization modified PET and 2,6-naphthalenedicarboxylic acid copolymerization modified PTT granules with the water content of less than 50ppm after drying respectively through respective screw extruders, feeding the granules into a composite 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 parallel composite elastic fibers.
In a preferred embodiment of the invention, the temperature of a spinning manifold corresponding to 2,6-naphthalenedicarboxylic acid copolymerization modified PET in the composite spinning component is 260-280 ℃, the temperature of a spinning manifold corresponding to 2,6-naphthalenedicarboxylic acid copolymerization modified PTT in the composite spinning component is 250-270 ℃, and the spinning speeds are 2400-3000 m/min.
In a preferred embodiment of the present invention, the temperature of the first heat box for false twisting is 160 to 175 ℃, the draw ratio is 1.7 to 1.85, and the processing speed is 500 to 800m/min.
The beneficial effects of the invention are:
1. the 2,6-naphthalenedicarboxylic acid copolymerized and modified PET and 2,6-naphthalenedicarboxylic acid copolymerized and modified PTT prepared by the method have excellent spinnability, thermal stability and thermal oxygen stability.
2. The side-by-side composite elastic fiber prepared by the invention has excellent elasticity and elastic recovery, the breaking strength is more than or equal to 3.5cN/dtex, the elongation at break is 22-35%, the fiber has high crimpability and fluffiness similar to wool, the crimp rate is 40-45%, the elastic elongation of the fabric is more than or equal to 28%, and the elastic recovery is more than or equal to 95%.
Detailed Description
The technical solution of the present invention is further illustrated and described by the following detailed description.
In the following examples, the modified PET refers to 2,6-naphthalenedicarboxylic acid copolymerized modified PET in the present invention, and the modified PTT refers to 2,6-naphthalenedicarboxylic acid copolymerized modified PTT in the present invention.
Example 1
(1) Preparing modified PET granules: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol, adding the terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol into a reaction kettle for esterification according to the mass calculation of theoretically produced modified PET, wherein the molar ratio of an acid component to an alcohol component is 1:1.25,2,6-naphthalenedicarboxylic acid is 3.0%, the esterification temperature is 250 ℃, the esterification pressure is micro positive pressure of 0.02MPa, the esterification rate reaches more than 96%, adding 0.5% of isosorbide into the esterified product, sequentially adding 100ppm of trimethyl phosphate, 1700ppm of antioxidant 1010 and 0.3% of titanium dioxide, finally adding 50ppm of catalyst ethylene glycol titanium, heating to 284 ℃, maintaining the vacuum below 80Pa for polycondensation reaction, stopping the reaction after the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the modified PET.
(2) Preparing modified PTT granules: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid, 1,3-propanediol and catalyst tetrabutyl titanate, mixing the mixture and adding the mixture into a reaction kettle for esterification according to the mass calculation of the modified PTT produced theoretically, wherein the molar ratio of an acid component to an alcohol component is 1: 1.5,2,6-naphthalenedicarboxylic acid adding amount is 0.5%, the catalyst tetrabutyl titanate adding amount is 35ppm, the esterification temperature is 230 ℃, the esterification rate reaches more than 99%, the esterification is completed, 1500ppm of antioxidant 1076 and 0.3% of titanium dioxide are added, the temperature is increased to 265 ℃, the vacuum below 80Pa is maintained for polycondensation reaction, the reaction is stopped after the stirring current and the online viscosity value reach preset values, and the mixture is conveyed into a vacuum drum for solid phase tackifying after extrusion and granulation, so that the high-viscosity modified PTT is obtained.
(3) Preparing the parallel composite elastic fiber: and respectively carrying out melt extrusion on the dried modified PET and modified PTT granules with the water content of below 50ppm by respective screw extruders, feeding the granules into a composite 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 to obtain the parallel composite elastic fibers. The mass ratio of the modified PET to the modified PTT is 50: 50, the temperature of a modified PET spinning box body is 268 ℃, the temperature of the modified PTT spinning box body is 260 ℃, and the spinning speed is 2700m/min. The temperature of the first heat box for false twisting is 165 ℃, the drafting ratio is 1.78, and the processing speed is 600m/min.
Example 2
(1) Preparing modified PET granules: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol according to the mass calculation of theoretically produced modified PET, adding the terephthalic acid, 2,6-naphthalenedicarboxylic acid and the ethylene glycol into a reaction kettle for esterification, wherein the molar ratio of an acid component to an alcohol component is 1: 1.3,2,6-naphthalenedicarboxylic acid, the addition amount of the acid component to the alcohol component is 3.5%, the esterification temperature is 252 ℃, the esterification pressure is micro-positive pressure of 0.02MPa, the esterification rate reaches over 96%, adding 0.5% of isosorbide into the esterified product, then sequentially adding 100ppm of trimethyl phosphate, 1700ppm of antioxidant 1010 and 0.3% of titanium dioxide, finally adding 50ppm of catalyst titanium glycol, heating to 284 ℃, maintaining the vacuum below 80Pa for polycondensation reaction, stopping the reaction after the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the modified PET.
(2) Preparing modified PTT granules: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid, 1,3-propanediol and catalyst tetrabutyl titanate, mixing the mixture and adding the mixture into a reaction kettle for esterification according to the mass calculation of the modified PTT produced theoretically, wherein the molar ratio of an acid component to an alcohol component is 1: 1.45,2,6-naphthalenedicarboxylic acid adding amount is 0.5%, the catalyst tetrabutyl titanate adding amount is 35ppm, the esterification temperature is 230 ℃, the esterification rate reaches more than 99%, the esterification is completed, 1500ppm of antioxidant 1076 and 0.3% of titanium dioxide are added, the temperature is increased to 260 ℃, the vacuum below 80Pa is maintained for polycondensation reaction, the reaction is stopped after the stirring current and the online viscosity value reach preset values, and the mixture is conveyed into a vacuum drum for solid phase tackifying after extrusion and granulation, so that the high-viscosity modified PTT is obtained.
(3) Preparing the parallel composite elastic fiber: and respectively carrying out melt extrusion on the dried modified PET and modified PTT granules with the water content of below 50ppm by respective screw extruders, feeding the granules into a composite 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 parallel composite elastic fibers. The mass ratio of the modified PET to the modified PTT is 45: 55, the temperature of the modified PET spinning box is 270 ℃, the temperature of the modified PTT spinning box is 260 ℃, and the spinning speed is 2700m/min. The temperature of the first heat box for false twisting is 165 ℃, the drafting ratio is 1.78, and the processing speed is 650m/min.
Example 3
(1) Preparing modified PET granules: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol, adding the terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol into a reaction kettle for esterification according to the mass calculation of theoretically produced modified PET, wherein the molar ratio of an acid component to an alcohol component is 1:1.25,2,6-naphthalenedicarboxylic acid is 5.0%, the esterification temperature is 255 ℃, the esterification pressure is micro positive pressure of 0.02MPa, the esterification rate reaches more than 96%, adding 0.5% of isosorbide into the esterified product, sequentially adding 100ppm of trimethyl phosphate, 1700ppm of antioxidant 1010 and 0.3% of titanium dioxide, finally adding 50ppm of catalyst ethylene glycol titanium, heating to 284 ℃, maintaining the vacuum below 80Pa for polycondensation reaction, stopping the reaction after the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the modified PET.
(2) Preparing modified PTT granules: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid, 1,3-propanediol and catalyst tetrabutyl titanate according to the mass calculation of the modified PTT produced theoretically, mixing, adding into a reaction kettle for esterification, wherein the molar ratio of an acid component to an alcohol component is 1: 1.4,2,6-naphthalenedicarboxylic acid is 0.7%, the addition of the catalyst tetrabutyl titanate is 50ppm, the esterification temperature is 232 ℃, the esterification rate reaches more than 99%, after esterification, 1100ppm of antioxidant 1076 and 0.3% of titanium dioxide are added, heating to 260 ℃ and maintaining the vacuum below 80Pa for polycondensation reaction, stopping the reaction after the stirring current and the online viscosity value reach preset values, extruding and granulating, conveying into a vacuum rotary drum for solid-phase tackifying, and obtaining the high-viscosity modified PTT.
(3) Preparing the parallel composite elastic fiber: and respectively carrying out melt extrusion on the dried modified PET and modified PTT granules with the water content of below 50ppm by respective screw extruders, feeding the granules into a composite 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 parallel composite elastic fibers. The mass ratio of the modified PET to the modified PTT is 55: 45, the temperature of the modified PET spinning box body is 272 ℃, the temperature of the modified PTT spinning box body is 262 ℃, and the spinning speed is 2850m/min. The temperature of the first heat box for false twisting is 165 ℃, the drafting ratio is 1.78, and the processing speed is 650m/min.
Example 4
(1) Preparing modified PET granules: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol, adding the terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol into a reaction kettle for esterification according to the mass calculation of theoretically produced modified PET, wherein the molar ratio of an acid component to an alcohol component is 1:1.25,2,6-naphthalenedicarboxylic acid is 7.0%, the esterification temperature is 255 ℃, the esterification pressure is micro positive pressure of 0.02MPa, the esterification rate reaches more than 96%, adding 0.3% of isosorbide into the esterified product, sequentially adding 70ppm of trimethyl phosphate, 1500ppm of antioxidant 1010 and 0.3% of titanium dioxide, finally adding 70ppm of catalyst ethylene glycol titanium, heating to 284 ℃, maintaining the vacuum below 80Pa for polycondensation reaction, stopping the reaction after the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the modified PET.
(2) Preparing modified PTT granules: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid, 1,3-propanediol and catalyst tetrabutyl titanate, mixing the mixture and adding the mixture into a reaction kettle for esterification according to the mass calculation of the modified PTT produced theoretically, wherein the molar ratio of an acid component to an alcohol component is 1: 1.45,2,6-naphthalenedicarboxylic acid adding amount is 1.5%, the catalyst tetrabutyl titanate adding amount is 50ppm, the esterification temperature is 235 ℃, the esterification rate reaches more than 99%, after the esterification is completed, 1100ppm of antioxidant 1076 and 0.3% of titanium dioxide are added, heating to 263 ℃, maintaining the vacuum below 80Pa for polycondensation reaction, stopping the reaction after the stirring current and the online viscosity value reach preset values, extruding and cutting into granules, conveying the granules into a vacuum drum for solid phase tackifying to obtain the modified PTT.
(3) Preparing the parallel composite elastic fiber: and respectively carrying out melt extrusion on the dried modified PET and modified PTT granules with the water content of below 50ppm by respective screw extruders, feeding the granules into a composite 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 parallel composite elastic fibers. The mass ratio of the modified PET to the modified PTT is 52: 48, the temperature of the modified PET spinning manifold is 275 ℃, the temperature of the modified PTT spinning manifold is 263 ℃, and the spinning speed is 2800m/min. The temperature of the first heat box for false twisting is 168 ℃, the drafting multiplying power is 1.78, and the processing speed is 600m/min.
The detection method of the modified PET, PTT cut grain, parallel composite elastic fiber and fabric thereof in the above embodiment is described as follows:
1. the intrinsic viscosity, melting point, carboxyl end group and chromaticity of the modified PET and PTT particles are tested according to the national standard GB/T14190-2008.
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 are carried out according to the standard GB/T14344-2008.
3. The crimp ratio of the elastic composite fiber is tested 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.
The main performance test indexes of the modified PET and modified PTT pellets prepared in examples 1 to 4 are shown in Table 1, and the main performance test indexes of the prepared parallel composite elastic fiber and the fabric thereof are shown in Table 2.
TABLE 1 Performance index of modified PET and PTT pellets from examples 1-4
TABLE 2 Performance index of the side-by-side conjugate elastic 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 (6)
1. A side-by-side conjugate elastic fiber characterized by: the section is of a peanut type parallel structure, and the composite material is prepared by extruding 2,6-naphthalenedicarboxylic acid copolymerization modified PET and 2,6-naphthalenedicarboxylic acid copolymerization modified PTT respectively according to the mass ratio of 45-55;
the 2,6-naphthalenedicarboxylic acid copolymerized and modified PET has the intrinsic viscosity of 0.53-0.65dl/g, the carboxyl end group content of 20-30mol/t, the melting point of 255-265 ℃ and the chromaticity b value of 3~6; the preparation method comprises the following steps: weighing terephthalic acid with an acid-alcohol molar ratio of 1.2 to 1.4,2,6-naphthalenedicarboxylic acid and ethylene glycol according to the mass calculation of the 2,6-naphthalenedicarboxylic acid copolymerization modified PET produced theoretically, adding the terephthalic acid, the 2,6-naphthalenedicarboxylic acid and the ethylene glycol into a reaction kettle for esterification reaction, wherein the temperature of the esterification reaction is 245 to 260 ℃, the pressure of the esterification reaction is a micro-positive pressure of 0.02MPa, and the esterification rate is up to more than 96% to complete esterification so as to obtain a first esterified substance; sequentially adding isosorbide, trimethyl phosphate, an antioxidant 1010, titanium dioxide and a catalyst titanium glycollate into the first esterified substance, heating and vacuumizing to ensure that the esterified substance is subjected to polycondensation reaction under the vacuum condition, stopping the reaction when the stirring current and the online viscosity value reach preset values, and extruding and granulating to obtain the 2,6-naphthalenedicarboxylic acid copolymerization modified PET;
the 2,6-naphthalenedicarboxylic acid copolymerization modified PTT has the intrinsic viscosity of 1.05 to 1.25dl/g, the terminal carboxyl group content of 10 to 20mol/t, the melting point of 224 to 230 ℃ and the chromaticity b value of 9 to 11; the preparation method comprises the following steps: weighing terephthalic acid, 2,6-naphthalenedicarboxylic acid, 1,3-propanediol and a catalyst tetrabutyl titanate with the acid-alcohol molar ratio of 1.25-1.55 according to the mass calculation of 2,6-naphthalenedicarboxylic acid copolymerization modified PTT produced theoretically, adding the terephthalic acid, the 2,6-naphthalenedicarboxylic acid, the 1,3-propanediol and the catalyst tetrabutyl titanate into a reaction kettle for esterification reaction, wherein the temperature of the esterification reaction is 225-250 ℃, the pressure of the esterification reaction is a micro-positive pressure of 0.02MPa, and the esterification rate reaches more than 99 percent to complete esterification, so as to obtain a second esterified substance; adding an antioxidant 1076 and titanium dioxide into the second esterified product, heating and vacuumizing to enable the esterified product to carry out polycondensation reaction under the vacuum condition, stopping the reaction when the stirring current and the online viscosity meter value reach preset values, extruding and granulating, and then conveying to a vacuum rotary drum for solid-phase tackifying to obtain the 2,6-naphthalenedicarboxylic acid copolymerization modified PTT.
2. A side-by-side conjugate elastic fiber as defined in claim 1, wherein: calculated according to the mass of the 2,6-naphthalenedicarboxylic acid copolymerized and modified PET which is produced theoretically, the additive amount of 2,6-naphthalenedicarboxylic acid is 1~8%, the additive amount of isosorbide is 0.1-0.8%, the additive amount of trimethyl phosphate is 50-200ppm, the additive amount of ethylene glycol titanium serving as a catalyst is 30-70ppm, the additive amount of an antioxidant 1010 is 1000-2000ppm, and the additive amount of titanium dioxide is 0.28-0.31%.
3. A side-by-side conjugate elastic fiber as in claim 1, wherein: calculated according to the mass of the 2,6-naphthalenedicarboxylic acid copolymerization modified PTT produced theoretically, the addition amount of 2,6-naphthalenedicarboxylic acid is 0.5-1.5%, the addition amount of a catalyst tetrabutyl titanate is 25-60ppm, the addition amount of an antioxidant 1076 is 1000-2000 ppm, and the addition amount of titanium dioxide is 0.28-0.31%.
4. A method for producing a side-by-side conjugate elastic fiber as set forth in any one of claims 1 to 3, characterized in that: the method comprises the following steps:
melting and extruding the 2,6-naphthalenedicarboxylic acid copolymerization modified PET and 2,6-naphthalenedicarboxylic acid copolymerization modified PTT granules with the water content of less than 50ppm after drying respectively through respective screw extruders, feeding the granules into a composite 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 parallel composite elastic fibers.
5. The method of claim 4, wherein: the temperature of a spinning manifold in the composite spinning assembly corresponding to 2,6-naphthalenedicarboxylic acid copolymerization modified PET is 260-280 ℃, the temperature of a spinning manifold in the composite spinning assembly corresponding to 2,6-naphthalenedicarboxylic acid copolymerization modified PTT is 250-270 ℃, and the spinning speed is 2400-3000m/min.
6. The method of claim 4, wherein: the temperature of the false twisting first hot box is 160 to 175 ℃, the drafting multiplying power is 1.7 to 1.85, and the processing speed is 500 to 800m/min.
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| CN112144128A (en) * | 2020-09-08 | 2020-12-29 | 上海海凯生物材料有限公司 | PTT/PET composite elastic short fiber for spinnable yarn and preparation method thereof |
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