CN114592252A - Preparation method of polyester filament yarn with heat absorption performance - Google Patents
Preparation method of polyester filament yarn with heat absorption performance Download PDFInfo
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- CN114592252A CN114592252A CN202111581502.4A CN202111581502A CN114592252A CN 114592252 A CN114592252 A CN 114592252A CN 202111581502 A CN202111581502 A CN 202111581502A CN 114592252 A CN114592252 A CN 114592252A
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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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
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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
- D01D1/00—Treatment of filament-forming or like material
- D01D1/06—Feeding liquid to the spinning head
- D01D1/065—Addition and mixing of substances to the spinning solution or to the melt; Homogenising
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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
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
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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
- D01D5/12—Stretch-spinning methods
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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
- D01F1/106—Radiation shielding agents, e.g. absorbing, reflecting agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The invention relates to the field of polyester fiber preparation, and provides a preparation method of polyester filament yarns with heat absorption performance aiming at the problems of compact polyester structure and difficult heat absorption of fibers, which comprises the following steps: A. merging the heat-absorbing master batches into a PET melt pipeline, and mixing to obtain a spinning mixed melt; B. carrying out circular blowing cooling on the mixed melt after spinning to obtain nascent fiber; C. and (3) oiling and stretching the nascent fiber, and then winding and forming to obtain the polyester filament with heat absorption performance. According to the invention, the heat-absorbing master batch is injected into the PET melt, and the prepared polyester fiber has heat-absorbing performance.
Description
Technical Field
The invention relates to the field of polyester fiber preparation, in particular to a preparation method of polyester filament yarns with heat absorption performance.
Background
The terylene is the chemical fiber with the highest yield and the largest consumption in the six major fibers, and has excellent physical properties and low production cost, so the terylene has wide application in the fields of industry, civilian use and military use. The polyester fiber has good breaking strength and tensile modulus, good heat resistance, corrosion resistance, air permeability and the like, and the annual polyester production yield is greatly improved. At present, many large-scale polyester production enterprises adopt a melt direct spinning mode to produce polyester, for example, patent CN103643318A discloses a method for manufacturing melt direct spinning multifunctional polyester industrial yarns, which comprises the following steps: 1) melt tackifying: tackifying the low-viscosity polyester melt obtained by polycondensation by a melt tackifying reactor to obtain a high-viscosity polyester melt; the tackifying temperature is 260-265 ℃, the pressure is 140-145 Pa, and the tackifying time is 4-5 hours; 2) mixing functional melt: conveying the high-viscosity polyester melt to a spinning box body through a melt pipeline for spinning, and mixing the functional melt and the high-viscosity polyester melt in proportion in the melt pipeline; 3) spinning; 4) drafting and heat setting; 5) winding and forming: the fiber after drafting and heat setting is wound and formed after network treatment; the pressure of the network device is 1-2 Mpa. The invention adopts the melt direct spinning process to produce the multifunctional polyester industrial yarn, and has higher production efficiency and lower energy consumption. Compared with slice spinning, the mode has the characteristics of high yield, stable melt index and the like, so melt direct spinning is adopted in the currently newly-built terylene production factories.
With the progress of society, the requirements of people on polyester fibers are diversified day by day, and in order to meet the requirements of various materials, the polyester fibers are rapidly developed from the functional and hand feeling differentiated fibers of the conventional polyester fibers. The terylene has high crystallinity and compact structure, and the prepared fiber has no heat absorption function, so an ideal solution is needed.
Disclosure of Invention
The invention provides a preparation method of polyester filament with heat absorption performance, aiming at overcoming the problems of compact structure and difficult heat absorption of the polyester fiber, and the polyester fiber prepared by injecting heat absorption master batch into PET melt has heat absorption performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of polyester filament yarn with heat absorption performance comprises the following steps:
A. merging the heat-absorbing master batches into a PET melt pipeline, and mixing to obtain a spinning mixed melt;
B. carrying out circular blowing cooling on the mixed melt after spinning to obtain nascent fiber;
C. and (3) oiling and stretching the nascent fiber, and then winding and forming to obtain the polyester filament with heat absorption performance.
Preferably, the endothermic master batch in step A is dried at 120-140 ℃ for 2-3 h.
Preferably, the addition amount of the heat-absorbing master batch in the step A is 4-6% of the mass of the PET melt.
Preferably, the endothermic master batch in step A is injected into the PET melt through a screw, and the temperatures of the zones of the screw are 270-.
Preferably, the air temperature of the cooling in the step B is 20-22 ℃, and the air pressure is 30-40 Pa.
Preferably, the drawing speed in step C is 3000-3500 m/min.
Preferably, the heat absorption master batch in the step A is composed of nano zirconium carbide and PET, and the particle size of the heat absorption master batch is 200-600 meshes. Zirconium carbide has the characteristics of efficiently absorbing visible light and reflecting infrared rays, and when it absorbs short-wavelength energy of 2 μm or less, which accounts for 95% of sunlight, it can store the energy in the material by thermal conversion, and it also has the characteristic of reflecting infrared rays of more than 2 μm. The infrared ray generated by human body has a wavelength of about 10 μm and will not be emitted outwards.
Preferably, the nano zirconium carbide is subjected to surface treatment, and the method comprises the following steps: dispersing chloroethylene, beta-hydroxybutyl acrylate and ammonium persulfate in water, heating to 70-80 ℃, adding a part of chain transfer agent mercaptoethanol, carrying out prepolymerization reaction, adding hydrophobic fiber, nano zirconium carbide and the rest chain transfer agent mercaptoethanol after 1-2h, and continuing to carry out polymerization reaction for 3-4h to obtain the zirconium carbide coated on the surface.
Preferably, the mass ratio of the vinyl chloride to the beta-hydroxybutyl acrylate to the hydrophobic fibers to the nano zirconium carbide to all the chain transfer agents is 1000 (10-100): 5-10): 18-20): 0.5-1, and the ratio of the chain transfer agents added for the first time to the chain transfer agents added for the second time is 3-5): 1.
The nano zirconium carbide is easy to agglomerate, is not easy to disperse uniformly, is directly mixed with PET, has poor compatibility and influence on heat absorption performance, and the hardness of the zirconium carbide is higher, so that the hand feeling comfort level of the fabric can be reduced. The zirconium carbide is surface-modified. The chloroethylene-acrylic acid-beta-hydroxybutyl polyester and the PET polyester have good compatibility, the zirconium carbide and the PET polyester can be coated on the surface of the zirconium carbide to improve the blending uniformity of the zirconium carbide and the PET, and the chloroethylene-acrylic acid-beta-hydroxybutyl polyester has high light transmittance and cannot influence the zirconium carbide to play a heat absorption role. Vinyl chloride and beta-hydroxybutyl acrylate are prepolymerized to obtain a polymer with a short chain segment, and then zirconium carbide is added, so that the polymer can be gradually adsorbed to the surface of the zirconium carbide to form a coating. The polymerization in two steps is mainly to wrap the hydrophobic fibers in a polymer, add the hydrophobic fibers while adding the zirconium carbide, the hydrophobic fibers are inserted between the prepolymers, the hydrophobic fibers are crosslinked again to form a network, the prepolymers are further polymerized to coat the hydrophobic fibers, and the prepolymers and the hydrophobic fibers are intertwined with each other, so that an inner layer and an outer layer are formed on the surface of the zirconium carbide, the inner layer is a hydrophobic net-shaped tissue structure, the outer layer is a hydrophilic high-density tissue structure, the differential capillary effect of the inner layer and the outer layer is increased, and the one-way moisture-conducting function is improved. Under the dual functions of heat absorption and moisture conduction, the fabric has better heat insulation performance and improves the wearing comfort. As can be seen from the performance effect, the invention needs to control the network sparsity of the inner layer and the network density of the outer layer, the polymerization is carried out in two steps in order to introduce the hydrophobic fiber, but the polymerization degree in the first step is too low to reduce the network density of the outer layer, so the dosage of the hydrophobic fiber and the proportion of the two polymerizations are important parameters.
Therefore, the beneficial effects of the invention are as follows: (1) by the online adding device, the heat-absorbing master batches are injected into the PET melt by using the screw, so that the production is continuous and the efficiency is high; (2) the prepared polyester fiber has heat absorption performance and meets the requirements of users; (3) the zirconium carbide is coated on the surface, and the heat absorption performance is improved.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In the present invention, unless otherwise specified, all the raw materials and equipment used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
General examples
A preparation method of polyester filament yarn with heat absorption performance comprises the following steps:
A. absorbing the heat-absorbing master batch into a small storage bin for pre-crystallization and drying, drying at the temperature of 120-; the temperature of each zone of the small screw is respectively heated to 280 ℃, 290 ℃, 295 ℃, 290 ℃ and 295 ℃, at this time, the discharge valve is in an open state, and the injection valve is in a closed state; after the temperature is raised, a small amount of master batch is manually added into the screw to observe the blanking condition, a small stock bin and a screw blanking port are connected after a discharge port stably discharges materials, the stable master batch melt is merged into the PET melt, a spinning mixed melt is obtained through a dynamic mixer, and the addition amount of the heat absorption master batch is 4-6% of the mass of the PET melt;
B. the mixed melt passes through a spinning assembly, and is cooled by circular blowing in a constant temperature and humidity environment to obtain nascent fiber, wherein the cooled wind temperature is 20-22 ℃, and the wind pressure is 30-40 Pa;
C. and (3) oiling the nascent fiber, drawing at 3000-3500m/min, and winding and forming on a Japanese TMT winding head to obtain the polyester filament yarn with heat absorption performance.
Example 1
A preparation method of polyester filament yarn with heat absorption performance comprises the following steps:
A. absorbing commercially available endothermic master batch (model HB-MB-IRPET09) into a small storage hopper for pre-crystallization and drying, drying at 135 ℃ for 2h, and removing crystal water in the master batch for later use; heating the temperature of each region of the small screw to 278, 288, 291, 292 and 293 ℃ respectively, wherein the discharge valve is in an open state and the injection valve is in a closed state; after the temperature is raised, a small amount of master batch is manually added into the screw to observe the blanking condition, a small stock bin and a screw blanking port are connected after a discharge port stably discharges materials, the stable master batch melt is merged into the PET melt, a spinning mixed melt is obtained through a dynamic mixer, and the addition amount of the heat absorption master batch is 5% of the mass of the PET melt;
B. the mixed melt passes through a spinning assembly, and is cooled by circular blowing in a constant temperature and humidity environment to obtain nascent fiber, wherein the cooled wind temperature is 22 ℃, and the wind pressure is 40 Pa;
C. and oiling the nascent fiber, stretching at 3000m/min, and winding and forming on a Japanese TMT winding head to obtain the polyester filament with heat absorption performance.
Example 2
A. Absorbing commercially available endothermic master batch (model HB-MB-IRPET09) into a small storage hopper for pre-crystallization and drying, drying at 120 ℃ for 3h, and removing crystal water in the master batch for later use; heating the temperature of each region of the small screw to 278, 285, 291, 293 and 295 ℃ respectively, wherein the discharge valve is in an open state and the injection valve is in a closed state; after the temperature is raised, a small amount of master batch is manually added into the screw to observe the blanking condition, a small stock bin and a screw blanking port are connected after a discharge port stably discharges materials, the stable master batch melt is merged into the PET melt, a spinning mixed melt is obtained through a dynamic mixer, and the addition amount of the heat absorption master batch is 4% of the mass of the PET melt;
B. the mixed melt passes through a spinning assembly, and is cooled by circular blowing in a constant temperature and humidity environment to obtain nascent fiber, wherein the cooled wind temperature is 20 ℃, and the wind pressure is 30 Pa;
C. and (3) oiling the nascent fiber, stretching by 3200m/min, and winding and forming on a Japanese TMT winding head to obtain the polyester filament with heat absorption performance.
Example 3
A. Absorbing commercially available endothermic master batch (model HB-MB-IRPET09) into a small storage hopper for pre-crystallization and drying, drying for 2h at 140 ℃, and removing crystal water in the master batch for later use; heating the temperature of each region of the small screw to 272, 281, 291, 292 and 293 ℃ respectively, wherein the discharge valve is in an open state and the injection valve is in a closed state; after the temperature is raised, a small amount of master batch is manually added into the screw to observe the blanking condition, a small stock bin and a screw blanking port are connected after a discharge port stably discharges materials, the stable master batch melt is merged into the PET melt, a spinning mixed melt is obtained through a dynamic mixer, and the addition amount of the heat absorption master batch is 6% of the mass of the PET melt;
B. the mixed melt passes through a spinning assembly, and is cooled by circular blowing in a constant temperature and humidity environment to obtain nascent fiber, wherein the cooled wind temperature is 22 ℃, and the wind pressure is 40 Pa;
C. and oiling the nascent fiber, stretching at 3500m/min, and winding and molding on a Japanese TMT winding head to obtain the polyester filament with heat absorption performance.
Example 4
The difference from the example 1 is that the heat absorption master batch is a self-made master batch, contains 20% (wt) of nano zirconium carbide, and the balance of PET, and the particle size of the heat absorption master batch is 400 meshes. The zirconium carbide is subjected to surface treatment, and the method comprises the following steps: dispersing chloroethylene, beta-hydroxybutyl acrylate and ammonium persulfate in water, heating to 75 ℃, adding a part of chain transfer agent mercaptoethanol, carrying out prepolymerization reaction, adding hydrophobic fiber, zirconium carbide and the rest chain transfer agent mercaptoethanol after 1h, and continuing to carry out polymerization reaction for 3h to obtain surface-coated zirconium carbide; the mass ratio of the chloroethylene, the beta-hydroxybutyl acrylate, the hydrophobic fibers, the zirconium carbide and all chain transfer agents is 1000:50:8:20:1, and the ratio of the chain transfer agents added for the first time to the chain transfer agents added for the second time is 4: 1.
Example 5
The difference from the example 1 is that the heat absorption master batch is a self-made master batch, contains 20% (wt) of nano zirconium carbide, and the balance of PET, and the particle size of the heat absorption master batch is 200 meshes. The zirconium carbide is subjected to surface treatment, and the method comprises the following steps: dispersing chloroethylene, beta-hydroxybutyl acrylate and ammonium persulfate in water, heating to 70 ℃, adding a part of chain transfer agent mercaptoethanol, carrying out prepolymerization reaction, adding hydrophobic fiber, zirconium carbide and the rest chain transfer agent mercaptoethanol after 2 hours, and continuing to carry out polymerization reaction for 4 hours to obtain surface-coated zirconium carbide; wherein the mass ratio of the chloroethylene, the beta-hydroxybutyl acrylate, the hydrophobic fiber, the zirconium carbide and all chain transfer agents is 1000:10:5:18:0.5, and the ratio of the chain transfer agents added for the first time to the chain transfer agents added for the second time is 3: 1.
Example 6
The difference from the example 1 is that the heat absorbing master batch is a self-made master batch containing 20% (wt) of nano zirconium carbide and the balance of PET, and the particle size of the heat absorbing master batch is 600 meshes. The zirconium carbide is subjected to surface treatment, and the method comprises the following steps: dispersing chloroethylene, beta-hydroxybutyl acrylate and ammonium persulfate in water, heating to 80 ℃, adding a part of chain transfer agent mercaptoethanol, carrying out prepolymerization reaction, adding hydrophobic fiber, zirconium carbide and the rest chain transfer agent mercaptoethanol after 2 hours, and continuing to carry out polymerization reaction for 4 hours to obtain surface-coated zirconium carbide; the mass ratio of the chloroethylene, the beta-hydroxybutyl acrylate, the hydrophobic fibers, the zirconium carbide and all chain transfer agents is 1000:100:10:20:1, and the ratio of the chain transfer agents added for the first time to the chain transfer agents added for the second time is 5: 1.
Comparative example 1
The difference from example 4 is that zirconium carbide is not surface treated.
Comparative example 2
The difference from example 4 is that in the zirconium carbide surface treatment step, the ratio of the chain transfer agent added for the first and second times was 2:1, comparative example 3
The difference from example 4 is that no hydrophobic fiber was added in the zirconium carbide surface treatment step.
Performance testing
(1) The polyester filaments prepared in each example and comparative example were woven into fabric for heat storage performance test
Detecting the specification of a sample: 15cm multiplied by 15cm, the tiling thickness is 0.8cm, and the concrete steps are as follows: a thermocouple humidity sensor was installed at the center of the back surface of the test specimen, and the temperature change when the surface of the test specimen was irradiated with light was observed under the following conditions.
The total test time is 20min, the lamp tube is used: kawasaki gas (strain) PRF500WD, irradiation distance: 30cm, measurement conditions: after irradiating with an infrared lamp for 10min, the power supply was immediately turned off and kept in this state for 10 min.
And (3) measuring environment: 20 ℃ and 65% RH.
The determination method comprises the following steps: the samples were tested in parallel and tested simultaneously, after which the two sample exchange positions were tested again, and the average of the two results was taken as the test result, as shown in the following table.
The heating rate of each embodiment is higher than that of the common polyester fabric, which shows that the polyester filament yarn prepared by the invention has heat absorption performance; after 10 minutes, the light source is removed, the temperature begins to drop, the heat preservation effect of the embodiment is better than that of the common polyester fabric, the polyester filament yarn prepared by the invention has heat absorption performance, can be quickly heated in a short time, has good heat storage capacity, and can continuously provide warmth for a human body. Example 4 the performance of the self-made heat-absorbing master batch containing zirconium carbide coated on the surface is superior to that of example 1, especially the heat storage performance. The zirconium carbide of comparative example 1 was not surface treated, was easily dispersed unevenly, and had limited endothermic performance. In comparative example 3, compared with example 4, the hydrophobic fiber is not added when the surface of zirconium carbide is coated, the influence of heat absorption performance is not great, but the heat storage performance is reduced.
(2) The polyester filaments prepared in examples 4 to 6 and comparative examples 1 to 3 were woven into fabrics, subjected to moisture permeability and sweat permeability tests, and tested for thermal resistance and moisture resistance by using an SDL sweat permeability and moisture permeability instrument according to the standard ISO11092:1993, and the results are shown in the following table.
| Example 4 | Example 5 | Example 6 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Thermal resistance/10-3km2W-1 | 9.5 | 9.5 | 9.7 | 12.3 | 10.9 | 11.5 |
| Wet drag/Pam2W-1 | 4.3 | 4.4 | 4.5 | 5.6 | 5.1 | 5.4 |
As can be seen from the table, the thermal resistance and the wet resistance of the examples 4 to 6 are smaller than those of the comparative examples 1 to 3, which shows that the coating of the zirconium carbide of the invention has the effects of improving heat and moisture transfer, and the prepared polyester filament yarn has excellent moisture-conducting and sweat-releasing performance. Comparative example 1 zirconium carbide was not surface modified and had the weakest moisture transport function. Comparative example 2 the degree of polymerization of the first step in the stepwise polymerization of coating is smaller than that of example 4 and is not in the preferred range, resulting in the decrease of moisture permeability and perspiration property, because too low degree of polymerization of the first step reduces the network density of the outer layer, a double-layer coating structure of example 4 with sparse inner layer and dense outer layer network cannot be obtained, and the differential capillary effect of the inner and outer layers cannot be increased, resulting in inferior moisture permeability to that of example 4. Comparative example 3 has no hydrophobic fiber added and no double layer structure, so the moisture wicking function is intermediate between comparative example 2 and comparative example 1.
The two tables are combined to show that the proportion of the two steps of adding the hydrophobic fiber and step-by-step polymerization is significant to the heat absorption and moisture conduction performance of the terylene.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The preparation method of the polyester filament yarn with the heat absorption performance is characterized by comprising the following steps:
A. merging the heat-absorbing master batches into a PET melt pipeline, and mixing to obtain a spinning mixed melt;
B. carrying out circular blowing cooling on the mixed melt after spinning to obtain nascent fiber;
C. and (3) oiling and stretching the nascent fiber, and then winding and forming to obtain the polyester filament with heat absorption performance.
2. The method as claimed in claim 1, wherein the endothermic masterbatch is dried at 120-140 ℃ for 2-3 h.
3. The method for preparing polyester filament yarn with heat absorption performance as claimed in claim 1, wherein the addition amount of the heat absorption master batch in the step A is 4-6% of the mass of the PET melt.
4. The method as claimed in claim 1, 2 or 3, wherein the endothermic masterbatch is injected into the PET melt through a screw, and the temperatures of the zones of the screw are 270-.
5. The method for preparing polyester filament yarn with heat absorption property as claimed in claim 1, wherein the cooling wind temperature in step B is 20-22 ℃ and the wind pressure is 30-40 Pa.
6. The method for preparing polyester filament yarn with heat absorption property as claimed in claim 1 or 5, wherein the drawing speed in step C is 3000-3500 m/min.
7. The method as claimed in claim 1, wherein the heat absorbing masterbatch comprises nanometer zirconium carbide and PET, and the particle size of the heat absorbing masterbatch is 200-600 mesh.
8. The method for preparing polyester filament yarn with heat absorption property as claimed in claim 7, wherein the nano zirconium carbide is subjected to surface treatment, comprising the steps of: dispersing chloroethylene, beta-hydroxybutyl acrylate and ammonium persulfate in water, heating to 70-80 ℃, adding a part of chain transfer agent mercaptoethanol, carrying out prepolymerization reaction, adding hydrophobic fiber, nano zirconium carbide and the rest chain transfer agent mercaptoethanol after 1-2h, and continuing to carry out polymerization reaction for 3-4h to obtain the zirconium carbide coated on the surface.
9. The method for preparing polyester filament yarn with heat absorption property as claimed in claim 8, wherein the mass ratio of the vinyl chloride, the beta-hydroxybutyl acrylate, the hydrophobic fiber, the nano zirconium carbide and all the chain transfer agents is 1000 (10-100): (5-10): 18-20): 0.5-1, and the ratio of the chain transfer agents added for the first time and the second time is 3-5): 1.
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