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CN-121976317-A - High-color-fastness low-color-difference colored polyester yarn and preparation method thereof

CN121976317ACN 121976317 ACN121976317 ACN 121976317ACN-121976317-A

Abstract

The invention relates to the technical field of colored polyester POY (polyester oriented yarn), in particular to a high-color-fastness low-color-difference colored polyester yarn and a preparation method thereof. The preparation method of the color polyester yarn with high color fastness and low color difference comprises the steps of firstly carrying out vacuum banburying on the color filler and the polyester chips after being mechanically and uniformly mixed with a surface modifier, putting the obtained banburying melt into a double-screw extruder, carrying out extrusion melting, water-cooling bracing, granulating and drying to obtain the color master particles, then uniformly mixing the color master particles and the polyester chips according to the mass ratio of 1 (1-7), drying to obtain a spinning mixture, finally putting the spinning mixture into the double-screw extruder, inputting the polyester melt into a spinning box, carrying out extrusion spinning through a spinneret plate under the action of a metering pump, carrying out annular blowing cooling forming, bundling oiling, pre-network forming and winding forming on the sprayed primary yarn to obtain the color polyester yarn with high color fastness and low color difference, wherein the color difference value delta E is less than or equal to 0.80, no waste water is generated, and the spinning production environment friendliness is good.

Inventors

  • XU WEIQING
  • LI JIAN

Assignees

  • 杭州新道远化纤有限公司

Dates

Publication Date
20260505
Application Date
20260310

Claims (10)

  1. 1. The preparation method of the high-color-fastness low-color-difference color polyester yarn is characterized by comprising the following steps: s1, preparing color master particles; S1.1, mechanically and uniformly mixing the colored filler and the surface modifier according to the mass ratio of 100 (2-5) to obtain a mixture A; S1.2, placing the mixture A and polyester chips in a vacuum internal mixer, and carrying out internal mixing for 240-360S under the protection of nitrogen and at 255-260 ℃ to obtain an internal mixing melt, wherein the content of colored filler in the internal mixing melt is 25-40wt%; S1.3, placing the internal smelting melt into a double-screw extruder for melt extrusion, and carrying out water-cooling bracing, granulating and drying on the obtained melt to obtain color master batch particles; s2, uniformly mixing the color master batch particles and the polyester chips according to the mass ratio of 1 (1-7), and drying to obtain a spinning mixture; S3, adding the spinning mixture into a double-screw extruder, inputting the extruded polyester melt into a spinning box, extruding and spinning through a spinneret plate under the action of a metering pump, and carrying out annular blowing cooling forming, bundling and oiling, pre-network forming and winding forming on the sprayed primary yarn to obtain the high-color fastness low-color-difference colored polyester yarn.
  2. 2. The colored polyester yarn with high color fastness and low color difference according to claim 1, wherein the colored filler is at least one of iron oxide red, iron oxide yellow, iron oxide green and iron oxide blue.
  3. 3. The colored polyester yarn with high color fastness and low color difference according to claim 1, wherein the surface modifier is at least one of gamma-aminopropyl triethoxysilane, gamma-aminopropyl trimethoxysilane, N-aminoethyl-3-aminopropyl triethoxysilane and N-aminoethyl-3-aminopropyl trimethoxysilane.
  4. 4. The high-color-fastness low-color-difference colored polyester yarn according to claim 1, wherein the structural formula of the surface modifier is as follows: wherein R 1 is a para-benzene ring or an ortho-benzene ring; R 2 is meta benzene ring; R 3 is- (CH 2 ) 6 ) -or ; R 4 is- (CH 2 ) 3 ; R 5 is-CH 2 -CH 3 or-CH 3 .
  5. 5. The high-color-fastness low-color-difference colored polyester yarn according to claim 4, wherein the preparation method of the surface modifier is as follows: S1, dissolving 3-isopropyl-dimethylbenzyl isocyanate and aromatic polyester polyol in an organic solvent, wherein the molar ratio of the aromatic polyester polyol to the 3-isopropyl-dimethylbenzyl isocyanate is (1-1.02): 1, adding an organotin catalyst and a polymerization inhibitor, heating to 75-80 ℃, and reacting until the-NCO content in the system is 0, thereby obtaining an intermediate A; S2, adding aliphatic isocyanate which is hexamethylene isocyanate or isophorone diisocyanate, wherein the molar ratio of the aliphatic isocyanate to the aromatic polyester polyol is (1-1.02): 1, and maintaining the reaction at 75-80 ℃ until the-NCO content in the system reaches a theoretical value to obtain an intermediate B; s3, adding methyl ethyl ketoxime, wherein the molar ratio of the methyl ethyl ketoxime to the aromatic polyester polyol is (1-1.02): 1, the temperature is adjusted to 60-80 ℃, and the reaction is carried out until the-NCO content in the system is 0, so as to obtain an intermediate C; s4, adding mercaptosilane and a photoinitiator, uniformly mixing, placing under a 200-365nm ultraviolet lamp, carrying out a mercaptoolefin click reaction for 15-30min at the ultraviolet irradiation intensity of 100-500 mu W/cm < 2>, distilling under reduced pressure to remove dimethylbenzene, and discharging in vacuum to obtain the surface modifier.
  6. 6. The high-color-fastness low-color-difference colored polyester yarn according to claim 5, wherein the aliphatic isocyanate is hexamethylene isocyanate, the aromatic polyester polyol is at least one of polyethylene terephthalate glycol, polyethylene phthalate glycol and polyethylene phthalate glycol with a hydroxyl value of 165-325mg KOH/g, and the organic solvent is xylene or xylene, and N, N-dimethylacetamide.
  7. 7. The high-color-fastness low-color-difference colored polyester yarn according to claim 1, wherein S1.3 is characterized in that an internal smelting melt is placed in a double-screw extruder for melt extrusion, the feeding speed of the internal smelting melt is 20-30kg/h, the length-diameter ratio L/D=42-48 of a screw, the rotating speed of the screw is 240rpm, the set temperature of a first temperature zone of a machine barrel is 255+/-5 ℃, the set temperature of a second temperature zone is 260+/-5 ℃, the set temperature of a third temperature zone is 270+/-5 ℃, the set temperature of a fourth temperature zone is 280+/-5 ℃, the set temperature of a fourth temperature zone to a seventh temperature zone is 290+/-5 ℃, the die head temperature is 290+/-5 ℃, and the obtained melt is subjected to water cooling bracing, granulating and drying to obtain color masterbatch particles.
  8. 8. The high-color-fastness low-color-difference colored polyester yarn according to claim 1, wherein S1.1 is characterized in that nitrogen is filled into a high-speed dispersion kettle to exhaust air, the mass ratio of the colored filler to the surface modifier is 100 (2-5), the colored filler and the surface modifier are added into the high-speed dispersion kettle, the nitrogen with the humidity of 25-40RH% is filled into the high-speed dispersion kettle at 1-2L/min under mechanical stirring at 400-600rpm, and the mixture A is obtained after mechanical stirring and mixing for 4-6 hours.
  9. 9. The high-color-fastness low-color-difference colored polyester yarn is characterized in that the temperature of a spinning box in S3 is 285-290 ℃, the pump supply is 650-750 g/min, the annular blowing pressure is 38-40 Pa, the blowing temperature is 23+ -1 ℃ and the humidity is 80-85RH%, the oil frame height is 900-920mm, the oil content of the polyester filament yarn is 0.55+ -0.05%, the network air pressure is 0.80-0.85MPa, and the winding speed is 2700-2800m/min.
  10. 10. A high-color-fastness low-color-difference colored polyester yarn is characterized in that the high-color-fastness low-color-difference colored polyester yarn is prepared by the preparation method of the high-color-fastness low-color-difference colored polyester yarn according to any one of claims 1 to 9, and the color difference value delta E of the high-color-fastness low-color-difference colored polyester yarn is less than or equal to 0.80.

Description

High-color-fastness low-color-difference colored polyester yarn and preparation method thereof Technical Field The invention relates to the technical field of colored polyester POY (polyester oriented yarn), in particular to a high-color-fastness low-color-difference colored polyester yarn and a preparation method thereof. Background The polyester fiber prepared from the PET resin has the advantages of high elasticity, dimensional stability, durability, low cost and the like, and is widely used in the fields of clothing, home textiles and industry. The molecular chain of the PET resin has no side chain, the coloring group can not be attached due to regular structure, the dyeability is biased, the dyeing rate is low at normal temperature and normal pressure, the color difference problem is easy to occur, and the existing polyester dyeing method is mainly based on high Wen Changgao overflow dyeing. However, with the enhancement of environmental awareness, advocating green production becomes a major trend, and high Wen Changgao overflow dyeing exposes the environmental pollution problems of high energy consumption, high water consumption and high COD emission. Therefore, the production technology of the environment-friendly colored polyester yarns is greatly developed, and the masterbatch spinning technology for producing the colored polyester yarns by taking the color masterbatch as a pigment becomes a popular research object. The uniform dispersion of the colored filler in the color master batch in the polyester resin matrix can directly influence the spinning performance, color fastness and color difference rate of the environment-friendly colored polyester yarns. The method for treating the surface of the colored filler is mainly carried out by taking red filler-iron oxide red as an example, and comprises the steps of uniformly mixing KH550 with deionized water/ethanol mixed solution, wherein the water/ethanol ratio is usually 1:9, regulating the pH value to 3.5-4.0 by glacial acetic acid to obtain a KH550 hydrolysis system, adding iron oxide red into the KH550 hydrolysis system, heating to 60-100 ℃ under ultrasonic dispersion for reacting for 0.5-2h, and obtaining the KH550 modified colored filler through suction filtration and drying after the reaction is finished. Although the surface treatment method of the colored filler improves the dispersion uniformity of the colored filler in the polyester resin matrix, the color difference problem of the environment-friendly colored polyester yarn still exists, and the reason is that the KH550 modified colored filler has polarity difference with the polyester polymer chain segment, so that ideal high dispersion uniformity of the KH550 modified colored filler cannot be realized. In addition, the color master batch is used as the pigment to produce the colored polyester yarn, the color fabric is prepared by the high Wen Changgao overflow dyeing, the environmental protection performance is improved, but a large amount of waste water is generated in the surface treatment process of the colored filler, and the construction of a green system of the full industrial chain of the colored polyester yarn is not easy. Disclosure of Invention The invention provides a high-color-fastness low-color-difference colored polyester yarn and a preparation method thereof, and aims to solve the color difference problem of the colored polyester yarn and improve the production environment-friendly property of the colored polyester yarn. The preparation method of the high-color-fastness low-color-difference color polyester yarn provided by the invention is realized by the following technical scheme: The preparation method of the high-color-fastness low-color-difference color polyester yarn comprises the following steps: s1, preparing color master particles; S1.1, mechanically and uniformly mixing the colored filler and the surface modifier according to the mass ratio of 100 (2-5) to obtain a mixture A; S1.2, placing the mixture A and polyester chips in a vacuum internal mixer, and carrying out internal mixing for 240-360S under the protection of nitrogen and at 255-260 ℃ to obtain an internal mixing melt, wherein the content of colored filler in the internal mixing melt is 25-40wt%; S1.3, placing the internal smelting melt into a double-screw extruder for melt extrusion, and carrying out water-cooling bracing, granulating and drying on the obtained melt to obtain color master batch particles; s2, uniformly mixing the color master batch particles and the polyester chips according to the mass ratio of 1 (1-7), and drying to obtain a spinning mixture; s3, adding the spinning mixture into a double-screw extruder, inputting the extruded polyester melt into a spinning box, extruding and spinning through a spinneret plate under the action of a metering pump, and carrying out annular blowing cooling forming, bundling and oiling, pre-network forming and winding forming on the sprayed primary yarn