Bicolor cool antibacterial cotton-like PA6 filament and preparation method thereof

Abstract

The present application relates to a kind of two-color cool antibacterial imitation cotton PA6 filament and its preparation method, including the following steps: S1, carrier PA6 chip, colorant, dispersing agent are uniformly blended, carrier PA6 chip, cool antibacterial composite material, dispersing agent are uniformly blended, respectively through double screw extruder melt plasticization, after water cooling granulation, PA6 fiber color masterbatch and PA6 fiber cool antibacterial masterbatch are prepared;PA6 fiber color masterbatch prepared with PA6 chip melt spinning is obtained colored PA6 FDY;PA6 fiber cool antibacterial masterbatch is prepared with PA6 chip melt spinning and obtained cool antibacterial PA6 FDY;Colored PA6 FDY is used as core yarn, cool antibacterial PA6 FDY is used as skin yarn, and a kind of two-color cool antibacterial imitation cotton PA6 filament with silk ring or silk arc structure is formed.The PA6 filament provided by the present application can directly obtain colored PA6 fiber with high color fastness and uniform color without subsequent dyeing, and the cool antibacterial functional PA6 fiber can more present the two-color effect of if there is or not after nozzle deformation plying.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of functional differential fiber technology, in particular to a double-color cool antibacterial cotton-like PA6 filament and a preparation method thereof. BACKGROUND

[0002] With the gradual shift of people's demand for clothing textiles towards external beauty and fashion as well as internal clothing performance comfort and health functionality, the development of functional differential fibers is more likely to win the favor of consumers. In order to better meet the market demand for functional differential fibers, the nylon fiber is modified on the basis of good strength, wear resistance, moisture absorption and elasticity, and new materials, new products and new technologies are put forward.

[0003] In patent No. CN117166106A, a nylon 6 differential ATY and its production method are disclosed. The application selects nylon 6 high orientation yarn HOY and nylon 6 fully drawn yarn FDY with different boiling water shrinkage and specifications as raw materials, and through the design of different overfeed rates, after passing through the yarn tube channel, the scissors opening and the core-sheath yarn roller, the nylon 6 differential ATY is obtained by plying at the ceramic nozzle. The obtained nylon 6 differential ATY has the characteristics of HOY bone feeling stiffness and FDY softness and silkiness, and the cotton feeling and comfort are better than those of conventional nylon 6 ATY. However, it is difficult to meet the special needs of people for fiber in terms of functionality such as coolness and antibacterial properties, which limits its application range.

[0004] Patent No. CN117166106A discloses a nylon 6 differential ATY and its production method. The application discloses a preparation method of a recyclable and renewable environment-friendly cationic cashmere-like special soft yarn double-color differential fiber, which is characterized by preparing recyclable and renewable colored polyester POY spinning, then core yarn DTY is added with elastic, and finally ATY air variation is obtained. The fiber can realize the effect of cashmere imitation; the composition selects recyclable and renewable cationic special materials, which is not only environmentally friendly, but also can realize normal temperature dyeing and has double-color effect. However, the fiber needs dyeing post-processing process to color, and POY melt spinning equipment and DTY elasticizer are needed, which increases the cost. SUMMARY

[0005] The purpose of the present application is to provide a double-color cool antibacterial cotton-like PA6 filament and a preparation method thereof, which can directly obtain colored PA6 fiber with high color fastness and uniform color without post-dyeing process, and at the same time solves the special functional needs of coolness and antibacterial properties, realizes green environmental protection and reduces cost.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a preparation method of a double-color cool antibacterial cotton-like PA6 filament, comprising the following steps:

[0007] Step S1, the carrier PA6 chip, colorant, dispersant are blended uniformly, and then the PA6 fiber color master batch is prepared by melting and plasticizing through a double screw extruder, water cooling and granulation; the carrier PA6 chip, cool-feeling antibacterial composite material, dispersant are blended uniformly, and then the PA6 fiber cool-feeling antibacterial master batch is prepared by melting and plasticizing through a double screw extruder, water cooling and granulation;

[0008] Step S2, the PA6 fiber color master batch and the PA6 chip are added into a double screw extruder at the same time, and then the colored PA6 FDY is prepared by further accurate metering of the spinning melt obtained by blending and melting through a metering pump, subsequent extrusion through a spinning assembly, cooling and molding, oiling, stretching and setting, winding and winding, and finally winding and winding; the PA6 fiber cool-feeling antibacterial master batch and the PA6 chip are added into a double screw extruder at the same time, and then the cool-feeling antibacterial PA6 FDY is prepared by further accurate metering of the spinning melt obtained by blending and melting through a metering pump, subsequent extrusion through a spinning assembly, cooling and molding, oiling, stretching and setting, winding and winding, and finally winding and winding.

[0009] Step S3, the colored PA6 FDY is used as the core yarn, and the cool-feeling antibacterial PA6 FDY is used as the skin yarn, and then a double-color cool-feeling antibacterial cotton-like PA6 filament is formed by passing through a raw yarn tube, a scissors opening, a core yarn transmission roller FR3, a skin yarn transmission roller FR4, an air variable box, a wet deformation plying, a DR roller and a WR winding roller.

[0010] Further, in the step S1, the carrier PA6 chip, colorant and dispersant are vacuum dried, and then fully stirred according to the mass percentage of 74%:18%:8%-78%:19%:3%; in the step S1, the carrier PA6 chip, cool-feeling antibacterial composite material and dispersant are vacuum dried, and then fully mixed according to the mass percentage of 74%:20%:6%-80%:15%:5%; wherein the carrier PA6 chip, colorant and dispersant, and the carrier PA6 chip, colorant and dispersant are fully stirred according to the mass percentage of 80%:16%:4%-70%:20%:10% respectively, the mixing speed is 800-1000 r / min, and the mixing time is 60-120 min.

[0011] Further, in the step S1, the double screw extrusion section temperature of the double screw extruder is 205-210℃, 220-230℃, 230-240℃ and 230-240℃ respectively, the die temperature is 230-240℃, and the extrusion speed is 80-84 r / min.

[0012] Furthermore, in step 2, the PA6 fiber color masterbatch and PA6 fiber cooling antibacterial masterbatch are added simultaneously to the twin-screw extruder along with PA6 chips at a mass percentage of 3%:97% to 10%:90%.

[0013] Furthermore, in step S2, the temperatures of zones one, two, three, four, and five of the twin-screw extruder are 253–256°C, 254–258°C, 255–259°C, 256–260°C, and 256–260°C, respectively, and the rotation speed is 38–42 rpm.

[0014] Furthermore, in step S2, the frequency of the metering pump is 40–60 Hz, and the specifications of the nonwoven filter screen in the spinning assembly are 77×6×20 µ.

[0015] Furthermore, in the cooling and forming process of step S2, a side-blowing method is adopted, with a side-blowing cooling temperature of 19-23℃, a wind speed of 0.45-0.55 m / s, a vertical distance of 700-1100 mm between the oil point on the bundle and the spinneret in the spinning assembly, and a vertical distance of 165-190 mm between the oil point and the air window.

[0016] Furthermore, in step S2, the pre-network air pressure is 1.20–1.40 bar, the main network air pressure is 3.50–3.80 bar, the speed of the first and second stretching guide rollers in the stretching and shaping process is 3500–3700 m / min, and the number of wire loops on the first and second stretching guide rollers is 2.5; the speed of the third and fourth shaping guide rollers is 4500–4900 m / min, and the number of wire loops on the third and fourth shaping guide rollers is 5.5; the heating temperature of the third shaping guide roller is 135°C–165°C; the speed of the fifth guide roller is 4500–5000 m / min; the winding speed of the winding cylinder is 4800 m / min; and the winding forming angle is 5.50–8.00°.

[0017] Furthermore, in step S3, the overfeed rate of the core yarn transfer roller FR3 is 10-18%, the overfeed rate of the leather yarn transfer roller FR4 is 20-30%, the core yarn water supply is 0.80-1.20 L / h, the network air pressure of the air transformer box is 10-11.50 bar, the speed of the DR roller is 200-500 m / min, and the winding cross angle of the WR winding roller is 25-35°.

[0018] Furthermore, the filament comprises a sheath and a core layer, wherein the core layer is a colored PA6 FDY filament and the sheath is a cooling and antibacterial PA6 FDY filament.

[0019] The beneficial effects of this invention are as follows: By designing the overfeed rate values ​​of a colored PA6 FDY filament (core yarn) and a cooling and antibacterial PA6 FDY filament (leather yarn) respectively, and utilizing humidification, nozzle deformation, and plying in an air-conditioned chamber, this invention successfully develops a two-tone cooling and antibacterial cotton-like PA6 filament. This gives it a triple combination of environmental friendliness, functionality, and fashion. No subsequent dyeing process is required to directly obtain colored PA6 fibers with high color fastness and uniform color, achieving green environmental protection. Furthermore, combining the colored PA6 fiber with PA6 fibers possessing excellent cooling and antibacterial properties after nozzle deformation and plying creates a subtle two-tone fashion effect and can construct a cotton-like style similar to natural fibers. In addition, only one set of melt spinning equipment is needed to produce the raw materials for air-conditioned yarn, achieving energy saving and consumption reduction. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Please see Figure 1 The present invention provides an embodiment: a method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament, comprising the following steps:

[0023] Step S1: Mix the carrier PA6 chips, colorant, and dispersant evenly, melt and plasticize them through a twin-screw extruder, and then cut them into pellets after water cooling to obtain PA6 fiber color masterbatch; Mix the carrier PA6 chips, cool-feeling antibacterial composite material, and dispersant evenly, melt and plasticize them through a twin-screw extruder, and then cut them into pellets after water cooling to obtain PA6 fiber cool-feeling antibacterial masterbatch.

[0024] Step S2: The obtained PA6 fiber is simultaneously added to a twin-screw extruder with color masterbatch and PA6 chips. After blending and melting, the resulting spinning melt is further precisely metered by a metering pump, then extruded by the spinning assembly, cooled and shaped, bundled and oiled, stretched and shaped, and wound into a winding cylinder to finally prepare colored PA6 FDY; The obtained PA6 fiber is simultaneously added to a twin-screw extruder with cooling antibacterial masterbatch and PA6 chips. After blending and melting, the resulting spinning melt is further precisely metered by a metering pump, then extruded by the spinning assembly, cooled and shaped, bundled and oiled, stretched and shaped, and wound into a winding cylinder to finally prepare cooling antibacterial PA6 FDY.

[0025] Step S3: Using colored PA6 FDY as the core yarn and cooling antibacterial PA6 FDY as the outer yarn, the yarn passes through the raw yarn tube, scissor end, core yarn transfer roller FR3, outer yarn transfer roller FR4, air-cooled box wet-texturing plying, DR roller, and WR winding roller to form a two-color cooling antibacterial cotton-like PA6 filament with a loop or arc structure. The carrier PA6 chips in Step S1 refer to one or more of full-dull FD, semi-dull SD, and bright BR. The colorant refers to one or more inorganic pigments such as titanium dioxide, carbon black, cadmium red, cobalt blue, and cadmium yellow. The cooling antibacterial composite material in Step S1 refers to one or more inorganic substances such as jade powder, mica powder, pearl powder, copper-based antibacterial agents, and titanium dioxide photocatalytic antibacterial agents. The dispersant in Step S1 refers to one or more of amide wax, esterified wax, polyethylene wax, silica, and stearic acid.

[0026] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the step S1 of "mixing the carrier PA6 slices, colorant, and dispersant evenly" further comprises: after vacuum drying the carrier PA6 slices, colorant, and dispersant, thoroughly stirring them at a mass percentage of 74%:18%:8% to 78%:19%:3% to achieve uniform mixing; the step S1 of "mixing the carrier PA6 slices, cooling antibacterial composite material, and dispersant evenly" further comprises: after vacuum drying the carrier PA6 slices, cooling antibacterial composite material, and dispersant, thoroughly stirring them at a mass percentage of 74%:20%:6% to 80%:15%:5%; wherein the carrier PA6 slices, colorant, and dispersant, and the carrier PA6 slices, colorant, and dispersant are all thoroughly stirred at a mass percentage of 80%:16%:4% to 70%:20%:10%, respectively, with a mixing speed of 800 to 1000 r / min and a mixing time of 60 to 120 min.

[0027] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the twin-screw extrusion section temperatures in step S1 are 205–210°C, 220–230°C, 230–240°C, and 230–240°C, respectively; the die head temperature is 230–240°C; and the extrusion speed is 80–84 r / min. The pelletized material is then dried in a vacuum oven at 80°C for 12 h.

[0028] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the PA6 fiber color masterbatch and PA6 fiber cooling antibacterial masterbatch in step 2 are added to the twin-screw extruder simultaneously with PA6 chips at a mass percentage of 3%:97%~10%:90%.

[0029] Please continue reading. Figure 1As shown, in one embodiment of the present invention, the temperatures of the first, second, third, fourth and fifth zones of the twin-screw extruder in step S2 are 253-256°C, 254-258°C, 255-259°C, 256-260°C and 256-260°C respectively, and the rotation speed is 38-42 rpm.

[0030] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the frequency of the metering pump in step S2 is 40-60Hz, and the specifications of the nonwoven filter screen in the spinning assembly are 77×6×20 µ.

[0031] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the cooling and forming process in step S2 adopts a side-blowing method. The side-blowing cooling temperature is 19-23℃ and the wind speed is 0.45-0.55 m / s to ensure uniform yarn evenness. The vertical distance between the oil point on the bundle and the spinneret in the spinning assembly is 700-1100 mm, and the vertical distance between the oil point and the spinneret is 165-190 mm.

[0032] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the pre-network air pressure in step S2 is 1.20–1.40 bar, the main network air pressure is 3.50–3.80 bar, the speed of the first and second stretching guide rollers in the stretching and shaping process is 3500–3700 m / min, and the number of wire loops on the first and second stretching guide rollers is 2.5; the speed of the third and fourth shaping guide rollers is 4500–4900 m / min, and the number of wire loops on the third and fourth shaping guide rollers is 5.5; the heating temperature of the third shaping guide roller is 135°C–165°C; the speed of the fifth guide roller is 4500–5000 m / min; the winding speed of the winding cylinder is 4800 m / min; and the winding forming angle of the WR winding roller is 5.50–8.00°. The first stretching guide roller and the second stretching guide roller are the first pair of guide rollers GR1, and the third shaping and drawing guide roller and the fourth drawing guide roller are the second pair of guide rollers GR2.

[0033] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the overfeed rate of the core yarn transfer roller FR3 in step S3 is 10-18%, the overfeed rate of the leather yarn transfer roller FR4 is 20-30%, the core yarn water supply is 0.80-1.20 L / h, the network air pressure of the air transformer box is 10-11.50 bar, the speed of the DR roller is 200-500 m / min, and the winding cross angle is 25-35°.

[0034] Please continue reading. Figure 1As shown, in one embodiment of the present invention, the filament includes a sheath and a core layer, the core layer being a colored PA6 FDY filament and the sheath being a cooling antibacterial PA6 FDY filament. Example 1:

[0035] (1) The carrier PA6-FD slices, carbon black inorganic pigment and stearic acid dispersant were vacuum dried at 100℃ for 12h. Then they were added to the feeding hopper in a mass percentage ratio of 75%:18%:7%, and mixed thoroughly for 30 min at a mixing speed of 900 r / min to obtain a uniformly mixed composite material;

[0036] (2) The composite material is melted and plasticized by a twin-screw extruder, wherein the temperatures of the twin-screw extrusion sections are 208℃, 220℃, 230℃ and 240℃ respectively, and the die head temperature is 240℃, thereby melting and plasticizing;

[0037] (3) The melt is extruded through a round die to form strips at an extrusion speed of 80 r / min. After being cooled by a water tank, the strips are drawn to a pelletizer to be pelletized, resulting in cylindrical granules with smooth surfaces and uniform particle size.

[0038] (4) The particulate matter was dried in a vacuum oven at 80°C for 12 h to obtain carbon black masterbatch for PA6 fibers with an average length of 3.50±0.1 mm and an average diameter of 2.50±0.2 mm.

[0039] (5) The dried 96% PA6 FD chips and 4% PA6 fiber carbon black masterbatch were mixed evenly in the mixing bin, and then melt-extruded through a twin-screw extruder. The temperatures of the first, second, third, fourth and fifth zones were 254℃, 255℃, 256℃, 257℃ and 258℃, respectively, and the rotation speed was 39 rpm.

[0040] (6) The metering pump frequency was selected as 40 Hz, the filter screen size inside the spinneret was 77×6×20 µ, the melt was extruded through the spinning assembly, and the assembly pressure was 65 kg / cm². 2 This forms a thin stream of melt;

[0041] (7) Under side-blowing conditions of 19℃ and 0.48 m / s, the fibers are cooled and shaped into uniformly skeined bundles. Further bundles are then oiled, with the oiling point 1000 mm vertically from the spinneret and 175 mm vertically from the air vent. Imported bamboo oil 6352AY is used, with an oil concentration of 8%, an oil pump frequency of 56 Hz, and a pump specification of 0.16 cc / r, to obtain nascent fibers.

[0042] (8) The nascent fibers are pre-networked and bound together. The pre-network air pressure is 1.35 bar, the speed of GR1 is 3620 m / min, and the number of yarn loops is 2.5. The speed of GR2 is 4880 m / min, and the number of yarn loops is 5.5. The heating temperature of the third shaping guide roller is 160℃. The main network air pressure is 3.65 bar, and the speed of the fifth guide roller is 4800 m / min.

[0043] (9) After the winding process, the winding speed is 4800 m / min, the initial winding forming angle is 6.00, and the winding forming angles with the winding movement are 6.30, 6.60, 7.00, 7.30, 7.70, 7.50, 7.20 and 6.40 respectively, to obtain 70D / 34FFD black PA6 FDY filament. Example 2:

[0044] (1) The carrier PA6-SD slices, cadmium red inorganic pigment, amide wax and polyethylene wax dispersant were vacuum dried at 100℃ for 12 h. Then they were added to the feeding hopper in a mass percentage ratio of 77%:19%:2%:2%, and mixed thoroughly for 60 min at a mixing speed of 800 r / min to obtain a uniformly mixed composite material;

[0045] (2) The composite material is melted and plasticized by a twin-screw extruder, wherein the temperatures of the twin-screw extrusion sections are 209℃, 222℃, 234℃ and 240℃ respectively, and the die head temperature is 240℃, thereby melting and plasticizing;

[0046] (3) The melt is extruded through a round die to form strips at an extrusion speed of 82 r / min. After being cooled by a water tank, the strips are drawn to a pelletizer to be pelletized, resulting in cylindrical granules with smooth surfaces and uniform particle size.

[0047] (4) The particulate matter was dried in a vacuum oven at 80°C for 12 h to obtain red masterbatch for PA6 fiber with an average length of 3.50±0.2 mm and an average diameter of 2.50±0.3 mm.

[0048] (5) The dried 97% PA6 FD chips and 3% PA6 fiber were mixed evenly in the mixing bin with red masterbatch, and then melt-extruded through a twin-screw extruder. The temperatures of the first, second, third, fourth and fifth zones were 254℃, 256℃, 257℃, 258℃ and 259℃, respectively, and the rotation speed was 40 rpm.

[0049] (6) The metering pump frequency was selected as 40 Hz, the filter screen size inside the spinneret was 77×6×20 µ, the melt was extruded through the spinning assembly, and the assembly pressure was 65 kg / cm². 2 This forms a thin stream of melt;

[0050] (7) Under side-blowing conditions of 20℃ and 0.45 m / s, the fibers are cooled and shaped into uniformly skeined bundles. Further bundles are then oiled, with the oiling point 700 mm vertically from the spinneret and 190 mm vertically from the air vent. Imported bamboo oil 6352AY is used, with an oil concentration of 8%, an oil pump frequency of 54 Hz, and a pump specification of 0.16 cc / r, to obtain nascent fibers.

[0051] (8) The nascent fibers are pre-networked and bound together. The pre-network air pressure is 1.40 bar, the speed of GR1 is 3650 m / min, and the number of yarn loops is 2.5. The speed of GR2 is 4515 m / min, and the number of yarn loops is 5.5. The heating temperature of the third shaping guide roller is 158℃. The main network air pressure is 3.70 bar, and the speed of the fifth guide roller is 4500 m / min.

[0052] (9) After the winding process, the winding speed is 4800 m / min, the initial winding forming angle is 5.50, and the winding forming angles with the winding movement are 6.10, 6.70, 7.30, 7.80, 7.50, 6.80, 6.50 and 6.00 respectively, to obtain 20D / 24FSD red PA6 FDY filament. Example 3:

[0053] (1) After vacuum drying the carrier PA6-FD slices, jade powder, mica powder, copper-based antibacterial agent, amide wax and polyethylene wax dispersant at 100℃ for 12 h, they were added to the feeding hopper in a mass percentage ratio of 79%:3%:5%:8%:2%:3%. The mixture was thoroughly mixed for 80 min at a mixing speed of 1000 r / min to obtain a uniformly mixed composite material.

[0054] (2) The composite material is melted and plasticized by a twin-screw extruder, wherein the temperatures of the twin-screw extrusion sections are 210℃, 225℃, 235℃ and 240℃ respectively, and the die head temperature is 240℃, thereby melting and plasticizing;

[0055] (3) The melt is extruded through a round die to form strips at an extrusion speed of 84 r / min. After being cooled by a water tank, the strips are drawn to a pelletizer to be pelletized, resulting in cylindrical granules with smooth surfaces and uniform particle size.

[0056] (4) The particulate matter was dried in a vacuum oven at 80°C for 12 h to obtain a cooling antibacterial masterbatch for PA6 fiber with an average length of 3.40±0.2 mm and an average diameter of 2.50±0.2 mm.

[0057] (5) The dried 95% PA6 FD chips and 5% PA6 fiber were mixed evenly in the mixing bin with the cooling antibacterial masterbatch, and then melt-extruded through a twin-screw extruder. The temperatures of the first, second, third, fourth and fifth zones were 255℃, 256℃, 257℃, 258℃ and 258℃, respectively, and the rotation speed was 41 rpm.

[0058] (6) The metering pump frequency was selected as 42 Hz, the nonwoven filter screen in the spinneret was 77×6×20µ, the melt was extruded through the spinning assembly, and the assembly pressure was 168 kg / cm². 2 This forms a thin stream of melt;

[0059] (7) Under side-blowing conditions of 20℃ and 0.50 m / s, the fibers are cooled and shaped into uniformly skeined bundles. Further bundles are then oiled, with the oiling point 800 mm vertically from the spinneret and 200 mm vertically from the air vent. Imported bamboo oil 6352AY is used, with an oil concentration of 8%, an oil pump frequency of 55 Hz, and a pump specification of 0.16 cc / r, to obtain nascent fibers.

[0060] (8) The nascent fibers are pre-networked and bound together. The pre-networking air pressure is 1.40 bar, the GR1 speed is 3700 m / min, and the number of yarn loops is 2.5; the GR2 speed is 4900 m / min, and the number of yarn loops is 5.5. The heating temperature of the third shaping guide roller is 140℃. The main network air pressure is 3.80 bar, and the speed of the fifth guide roller is 4800 m / min.

[0061] (9) After the winding process, the winding speed is 4800 m / min, the initial winding forming angle is 6.0, and the winding forming angles with the winding movement are 6.10, 6.40, 7.00, 7.30, 7.60, 7.40, 7.00 and 6.20 respectively, to obtain 40D / 34F FD cool-feel antibacterial PA6 FDY filament. Example 4:

[0062] (1) After the carrier PA6-SD slices, mica powder, zinc antibacterial agent, nano-sized titanium dioxide photocatalytic antibacterial agent, amide wax and stearic acid dispersant were vacuum dried at 100℃ for 12 h, they were added to the feeding hopper in a mass percentage ratio of 76%:10%:4%:5%:3%:2%. The mixture was thoroughly mixed for 60 min at a mixing speed of 1000 r / min to obtain a uniformly mixed composite material.

[0063] (2) The composite material is melted and plasticized by a twin-screw extruder, wherein the temperatures of the twin-screw extrusion sections are 210℃, 222℃, 238℃ and 240℃ respectively, and the die head temperature is 240℃, thereby melting and plasticizing;

[0064] (3) The melt is extruded through a round die to form strips at an extrusion speed of 83 r / min. After being cooled by a water tank, the strips are drawn to a pelletizer to be pelletized, resulting in cylindrical granules with smooth surfaces and uniform particle size.

[0065] (4) The particulate matter was dried in a vacuum oven at 80°C for 12 hours to obtain a cooling antibacterial masterbatch for PA6 fiber with an average length of 3.30±0.3 mm and an average diameter of 2.30±0.1 mm.

[0066] (5) The dried 95.5% PA6 FD chips and 4.5% PA6 fiber were mixed evenly in the mixing bin with the cooling antibacterial masterbatch, and then melt-extruded through a twin-screw extruder. The temperatures of the first, second, third, fourth and fifth zones were 255℃, 257℃, 258℃, 259℃ and 259℃, respectively, and the rotation speed was 42 rpm.

[0067] (6) The metering pump frequency was selected as 59.60 Hz, the filter screen size inside the spinneret was 77×6×20µ, the melt was extruded through the spinning assembly, and the assembly pressure was 170 kg / cm². 2 This forms a thin stream of melt;

[0068] (7) Under the conditions of a side-blowing temperature of 22.5℃ and a wind speed of 0.52 m / s, the fibers are cooled and shaped into uniformly skeined bundles. Further oiling is performed on the bundles, with the oiling point 900 mm vertically from the spinneret and 190 mm vertically from the air vent. Imported bamboo oil 6352AY is used, with an oil concentration of 7%, an oil pump frequency of 61.7 Hz, and a pump specification of 0.16 cc / r, to obtain nascent fibers.

[0069] (8) The nascent fibers are pre-networked and bound together. The pre-network air pressure is 1.30 bar, the speed of GR1 is 3570 m / min, and the number of yarn loops is 2.5. The speed of GR2 is 4865 m / min, and the number of yarn loops is 5.5. The heating temperature of the third shaping guide roller is 165℃. The main network air pressure is 3.75 bar, and the speed of the fifth guide roller is 4820 m / min.

[0070] (9) After the winding process, the winding speed is 4800m / min, the initial winding forming angle is 5.50, and the winding forming angles with the winding movement are 5.70, 6.00, 6.40, 6.70, 7.00, 6.70, 6.40 and 5.80 respectively, to obtain 50D / 24F FD cool-feel antibacterial PA6 FDY filament. Example 5:

[0071] (1) The black PA6 FDY filament obtained in Example 1 was used as the air-deformed core yarn, and the cool-feeling antibacterial PA6 FDY filament obtained in Example 3 was used as the air-deformed outer yarn. They were respectively passed through the raw yarn tube and the scissor end. The core yarn was passed through the core yarn transfer roller (FR3), and the outer yarn was passed through the outer yarn transfer roller (FR4). The overfeed rate of FR3 was 14%, and the overfeed rate of FR4 was 25%.

[0072] (2) Subsequently, the core yarn is moistened by a water nozzle in an air-texturing chamber, and together with the outer yarn, it is textured and twisted through an air-texturing nozzle. After passing through the DR roller and WR winding roller, a two-color, cool-feeling, antibacterial, cotton-like PA6 filament with a loop or arc structure is formed. The water supply rate is 0.80 L / h, the air pressure in the air-texturing chamber is 10 bar, the DR roller speed is 350 m / min, and the winding cross angle is 28°. Fabric 1 is woven from the fibers of Example 5. Example 6:

[0073] (1) The red PA6 FDY filament prepared in Example 2 was used as the air-deformed core yarn, and the cool-feeling antibacterial PA6 FDY filament prepared in Example 4 was used as the air-deformed outer yarn. They were passed through the raw yarn tube and the scissor end, respectively. The core yarn was passed through the core yarn transfer roller (FR3), and the outer yarn was passed through the outer yarn transfer roller (FR4). The overfeed rate of FR3 was 15%, and the overfeed rate of FR4 was 26%.

[0074] (2) Subsequently, the core yarn is moistened by a water nozzle in the air-texturing chamber, and together with the outer yarn, it is textured and twisted through the air-texturing nozzle. After passing through the DR roller and WR winding roller, a two-color, cool-feeling, antibacterial, cotton-like PA6 filament with a loop or arc structure is formed. The water supply rate is 0.90 L / h, the air pressure in the air-texturing chamber network is 11.50 bar, the DR roller speed is 400 m / min, and the winding cross angle is 30°. Fabric 2 is woven from the fibers of Example 6.

[0075] The physical properties of the fibers in Examples 5-6 were tested, and the results are shown in Table 1 below.

[0076]

[0077] Table 1. Physical property indicators of Examples 5-6

[0078] Fabric 1 and Fabric 2 were tested for their cooling and antibacterial functions by a third-party testing agency. The results are shown in Table 2 below.

[0079]

[0080] Table 2 Results of testing the cooling and antibacterial functions of fabric 1 and fabric 2

[0081] The above description is only a preferred embodiment of the present invention and should not be construed as a limitation of this application. All equivalent changes and modifications made in accordance with the scope of the patent application of the present invention should be covered by the present invention.

Claims

1. A method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament, characterized in that, Includes the following steps: Step S1: The carrier PA6 chips, colorant, and dispersant are mixed evenly, melt-plasticized by a twin-screw extruder, and then water-cooled and pelletized to obtain PA6 fiber color masterbatch; The carrier PA6 chips, cooling antibacterial composite material, and dispersant are mixed evenly, melt-plasticized by a twin-screw extruder, and then water-cooled and pelletized to obtain PA6 fiber cooling antibacterial masterbatch; The cooling antibacterial composite material is one or more of the following: jade powder, mica powder, pearl powder, copper-based antibacterial agent, and titanium dioxide photocatalytic antibacterial agent; Step S2: The obtained PA6 fiber is simultaneously added to a twin-screw extruder with color masterbatch and PA6 chips. After blending and melting, the resulting spinning melt is further precisely metered by a metering pump, then extruded by the spinning assembly, cooled and shaped, bundled and oiled, stretched and shaped, and wound into a winding cylinder to finally prepare colored PA6 FDY; The obtained PA6 fiber is simultaneously added to a twin-screw extruder with cooling antibacterial masterbatch and PA6 chips. After blending and melting, the resulting spinning melt is further precisely metered by a metering pump, then extruded by the spinning assembly, cooled and shaped, bundled and oiled, stretched and shaped, and wound into a winding cylinder to finally prepare cooling antibacterial PA6 FDY; Step S3: Using colored PA6 FDY as the core yarn and cool-feeling antibacterial PA6 FDY as the outer yarn, the yarn passes through the raw yarn tube, scissor end, core yarn transfer roller FR3, outer yarn transfer roller FR4, air-conditioning box for wet texturing and plying, DR roller, and WR winding roller to form a two-color cool-feeling antibacterial cotton-like PA6 filament with a loop or arc structure.

2. The method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament according to claim 1, characterized in that, The step S1, "mixing the carrier PA6 slices, colorant, and dispersant evenly," is further described as follows: The carrier PA6-FD slices, carbon black inorganic pigment, and stearic acid dispersant are vacuum dried at 100°C for 12 hours. Then, they are added to the feeding hopper at a mass percentage ratio of 75%:18%:7%, and thoroughly mixed for 30 minutes at a mixing speed of 900 r / min to obtain a uniformly mixed composite material. The step S1, "mixing the carrier PA6 slices, cool-feeling antibacterial composite material, and dispersant evenly," is further described as follows: The carrier PA6-FD slices, jade powder, mica powder, copper-based antibacterial agent, amide wax, and polyethylene wax dispersant are vacuum dried at 100°C for 12 hours. Then, they are added to the feeding hopper at a mass percentage ratio of 79%:3%:5%:8%:2%:3%, and thoroughly mixed for 80 minutes at a mixing speed of 1000 r / min to obtain a uniformly mixed composite material.

3. The method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament according to claim 1, characterized in that, The step S1, "mixing the carrier PA6 slices, colorant, and dispersant evenly," further comprises: vacuum drying the carrier PA6-SD slices, cadmium red inorganic pigment, amide wax, and polyethylene wax dispersant at 100°C for 12 h, and then adding them to the feeding hopper in a mass percentage ratio of 77%:19%:2%:2%, mixing thoroughly for 60 min at a mixing speed of 800 r / min to obtain a uniformly mixed composite material; the step S1, "mixing the carrier PA6 slices, cooling antibacterial composite material, and dispersant evenly," further comprises: vacuum drying the carrier PA6-SD slices, mica powder, zinc-based antibacterial agent, nano-grade titanium dioxide photocatalytic antibacterial agent, amide wax, and stearic acid dispersant at 100°C for 12 h, and then adding them to the feeding hopper in a mass percentage ratio of 76%:10%:4%:5%:3%:2%, mixing thoroughly for 60 min at a mixing speed of 1000 r / min to obtain a uniformly mixed composite material.

4. The method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament according to claim 1, characterized in that: In step S1, the twin-screw extrusion section temperatures in the twin-screw extruder are 205–210°C, 220–230°C, 230–240°C, and 230–240°C, respectively, the die head temperature is 230–240°C, and the extrusion speed is 80–84 r / min.

5. The method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament according to claim 1, characterized in that: In step 2, the PA6 fiber masterbatch and the PA6 fiber cooling antibacterial masterbatch are added to the twin-screw extruder simultaneously with the PA6 chips at a mass percentage of (3%:97%) to (10%:90%).

6. The method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament according to claim 1, characterized in that: In step S2, the temperatures of zones one, two, three, four, and five of the twin-screw extruder are 253–256°C, 254–258°C, 255–259°C, 256–260°C, and 256–260°C, respectively, and the rotation speed is 38–42 rpm.

7. The method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament according to claim 1, characterized in that: The metering pump in step S2 has a frequency of 40–60 Hz, and the nonwoven filter in the spinning assembly has a size of 77×6×20 µm.

8. The method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament according to claim 1, characterized in that: In step S2, the cooling and forming process adopts a side-blowing method. The side-blowing cooling temperature is 19-23℃, the wind speed is 0.45-0.55 m / s, the vertical distance between the oil point on the bundle and the spinneret in the spinning assembly is 700-1100 mm, and the vertical distance between the oil point and the spinneret is 165-190 mm.

9. The method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament according to claim 1, characterized in that: In step S2, the pre-network air pressure is 1.20–1.40 bar, the main network air pressure is 3.50–3.80 bar, the speed of the first and second stretching guide rollers in the stretching and shaping process is 3500–3700 m / min, and the number of wire loops on the first and second stretching guide rollers is 2.5; the speed of the third and fourth shaping guide rollers is 4500–4900 m / min, and the number of wire loops on the third and fourth shaping guide rollers is 5.5; the heating temperature of the third shaping guide roller is 135°C–165°C; the speed of the fifth guide roller is 4500–5000 m / min; the winding speed of the winding cylinder is 4800 m / min; and the winding forming angle is 5.50–8.00°.

10. The method for preparing a two-color, cooling, antibacterial, cotton-like PA6 filament according to claim 1, characterized in that: In step S3, the overfeed rate of the core yarn transfer roller FR3 is 10-18%, the overfeed rate of the leather yarn transfer roller FR4 is 20-30%, the core yarn water supply is 0.80-1.20 L / h, the network air pressure of the air transformer box is 10-11.50 bar, the speed of the DR roller is 200-500 m / min, and the winding cross angle of the WR winding roller is 25-35°.

11. A filament prepared by the method for preparing the two-color cooling antibacterial cotton-like PA6 filament according to claim 1, characterized in that, The filament comprises a sheath and a core, wherein the core is a colored PA6 FDY filament and the sheath is a cooling and antibacterial PA6 FDY filament.

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