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

Abstract

The preparation method comprises the following steps: S1, uniformly blending carrier PA6 slices, a coloring agent and a dispersing agent, uniformly blending the carrier PA6 slices, a cool-feeling antibacterial composite material and the dispersing agent, melting and plasticizing by a double-screw extruder, and carrying out water-cooling pelletizing, so as to obtain color master batches for PA6 fibers and cool-feeling antibacterial master batches for the PA6 fibers; carrying out melt spinning on the prepared color master batch for the PA6 fiber and PA6 slices to obtain colored PA6 FDY (Fully Drawn Yarn); carrying out melt spinning on the cool-feeling antibacterial master batch for PA6 fibers and PA6 slices to obtain cool-feeling antibacterial PA6 FDY (Fully Drawn Yarn); colored PA6 FDY is used as core yarn, cool-feeling antibacterial PA6 FDY is used as skin yarn, and the double-color cool-feeling antibacterial cotton-like PA6 filament with a filament loop or filament arc structure is formed. According to the PA6 filament provided by the invention, the colored PA6 fiber with high color fastness and uniform color can be directly obtained without post-dyeing, and the colored PA6 fiber and the cool-feeling antibacterial functional PA6 fiber can better present a double-color effect if the colored PA6 fiber is present if the colored PA6 fiber is present if the colored PA6 fiber is not present after the colored PA6 fiber and the cool-feeling antibacterial functional PA6 fiber are deformed and stranded at a nozzle.

Description

Technical Field

[0001] The invention relates to the technical field of functional differentiated fibers, in particular to a double-color cool and antibacterial cotton-like PA6 filament and a preparation method thereof. Background Art

[0002] As people's demand for clothing textiles gradually shifts to external beauty and fashion as well as the comfort and health of internal clothing performance, the development of functional differentiated fibers is more likely to win the favor of consumers. In order to better meet the market demand for functional differentiated fibers, nylon fibers are modified based on their good strength, wear resistance, moisture absorption and elasticity, and new materials, new products and new technologies are introduced.

[0003] Patent No. CN117166106A discloses a nylon 6 differentiated ATY and its production method. The application selects nylon 6 highly oriented yarn HOY and nylon 6 fully drawn yarn FDY with different boiling water shrinkage and specifications as raw materials, and designs different overfeeding rates, passes through the yarn tube channel, scissor mouth, core-skin yarn roller and then folds at the ceramic nozzle. The obtained nylon 6 differentiated ATY has the characteristics of HOY's bony stiffness and FDY's softness, comfort and silkiness, and is better than conventional nylon 6 ATY in cotton feel and comfort. However, it is difficult to meet people's special requirements for fiber functionality, such as coolness and antibacterial properties, which limits its application range.

[0004] Patent No. CN117166106A discloses a nylon 6 differentiated ATY and its production method. The application discloses a method for preparing a recyclable, environmentally friendly, cationic cashmere-like special soft yarn two-color differentiated fiber, characterized in that the fiber obtained by preparing recyclable, regenerated colored polyester POY spinning, then core yarn DTY stretching, and finally ATY air transformation can achieve the effect of cashmere-like; the composition uses recyclable, regenerated cationic special materials, which is not only environmentally friendly, but also can be dyed at room temperature and has a two-color effect. However, a post-dyeing treatment process is required to color the fiber, and two devices, POY melt spinning equipment and DTY stretching machine, are required, which increases the cost. Summary of the invention

[0005] The purpose of the present invention is to provide a two-color cool and antibacterial cotton-like PA6 filament and a preparation method thereof, which can directly obtain colored PA6 fibers with high color fastness and uniform color without the need for a subsequent dyeing process, while also solving the special functional requirements of cool and antibacterial properties, achieving green environmental protection, and reducing costs.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing a two-color cool antibacterial cotton-like PA6 filament, comprising the following steps:

[0007] Step S1, uniformly blending the carrier PA6 slices, the colorant, and the dispersant, melting and plasticizing through a twin-screw extruder, and water-cooling and pelletizing to obtain a PA6 fiber masterbatch; uniformly blending the carrier PA6 slices, the cool antibacterial composite material, and the dispersant, melting and plasticizing through a twin-screw extruder, and water-cooling and pelletizing to obtain a PA6 fiber cool antibacterial masterbatch;

[0008] Step S2, adding the prepared PA6 fiber masterbatch and PA6 slices to a twin-screw extruder synchronously, the spinning melt obtained after blending and melting is further accurately metered by a metering pump, then extruded by a spinning assembly, cooled and formed, bundled and oiled, stretched and shaped, and wound on a bobbin, and finally prepared colored PA6 FDY; adding the PA6 fiber cool antibacterial masterbatch and PA6 slices to a twin-screw extruder synchronously, the spinning melt obtained after blending and melting is further accurately metered by a metering pump, then extruded by a spinning assembly, cooled and formed, bundled and oiled, stretched and shaped, and wound on a bobbin, and finally prepared cool antibacterial PA6 FDY;

[0009] Step S3, using colored PA6 FDY as core yarn and cool antibacterial PA6 FDY as skin yarn, after passing through raw yarn tube, scissor mouth, core yarn transmission roller FR3, skin yarn transmission roller FR4, air change box for wet deformation plying, DR roller, WR winding roller, a two-color cool antibacterial cotton-like PA6 filament with a loop or arc structure is formed.

[0010] Furthermore, the step S1 of "evenly blending the carrier PA6 slices, colorant and dispersant" is further as follows: after vacuum drying the carrier PA6 slices, colorant and dispersant, they are fully stirred at a mass percentage of 74%: 18%: 8% to 78%: 19%: 3%; the step S1 of "evenly blending the carrier PA6 slices, cool antibacterial composite material and dispersant" is further as follows: after vacuum drying the carrier PA6 slices, cool antibacterial composite material and dispersant, they are evenly mixed at a mass percentage of 74%: 20%: 6% to 80%: 15%: 5%; wherein the carrier PA6 slices, colorant, dispersant and the carrier PA6 slices, colorant, dispersant are fully stirred at a mass percentage of 80%: 16%: 4% to 70%: 20%: 10%, respectively, the mixing speed is 800 to 1000 r / min, and the mixing time is 60 to 120 min.

[0011] Furthermore, the temperatures of the twin-screw extrusion sections in the twin-screw extruder in step S1 are 205-210° C., 220-230° C., 230-240° C., 230-240° C., respectively, the die head temperature is 230-240° C., and the extrusion speed is 80-84 r / min.

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

[0013] Furthermore, the temperatures of zone 1, zone 2, zone 3, zone 4 and zone 5 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 38-42rpm.

[0014] Furthermore, the metering pump frequency in step S2 is 40-60 Hz, and the specification of the non-woven fabric filter in the spinning assembly is 77×6×20μ.

[0015] Furthermore, in the cooling and forming in step S2, a side blowing method is adopted, the side blowing cooling temperature is 19-23°C, the wind speed is 0.45-0.55m / s, the vertical distance between the bunching oiling point and the spinneret in the spinning assembly is 700-1100mm, and the vertical distance from the wind window is 165-190mm.

[0016] Furthermore, 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 speeds of the first stretching guide roller and the second stretching guide roller in the stretching and shaping are 3500-3700 m / min, and the number of wire hanging circles of the first stretching guide roller and the second stretching guide roller is 2.5 circles; the speeds of the third shaping drawing guide roller and the fourth drawing guide roller are 4500-4900 m / min, and the number of wire hanging circles of the third shaping drawing guide roller and the fourth drawing guide roller is 5.5 circles, wherein 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 bobbin 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 transmission roller FR3 is 10-18%, the overfeed rate of the skin yarn transmission roller FR4 is 20-30%, the core yarn water supply is 0.80-1.20 L / h, the network air pressure of the air change 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 skin layer and a core layer, the core layer is a colored PA6 FDY filament, and the skin layer is a cool and antibacterial PA6 FDY filament.

[0019] Beneficial effects of the present invention: The present invention designs the overfeed rate values ​​of a colored PA6 FDY filament (core yarn) and a cool antibacterial PA6 FDY filament (skin yarn) respectively, and utilizes the wetting, nozzle deformation, and plying in the air-changing box to successfully develop a two-color cool antibacterial cotton-like PA6 filament, giving it a triple superposition of environmental protection, functionality, and fashion. Without the need for a subsequent dyeing process, a colored PA6 fiber with high color fastness and uniform color can be directly obtained, achieving green environmental protection; after the colored PA6 fiber and the PA6 fiber with excellent cool antibacterial function are deformed and plyed by the nozzle, a two-color fashion effect that is vague can be presented, and a cotton-like style similar to natural fibers can be constructed. In addition, only one set of melt spinning equipment is needed to produce the raw materials of air-changing yarns, achieving energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the method flow of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

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

[0023] Step S1, uniformly blending the carrier PA6 slices, the colorant, and the dispersant, melting and plasticizing through a twin-screw extruder, and water-cooling and pelletizing to obtain a PA6 fiber masterbatch; uniformly blending the carrier PA6 slices, the cool antibacterial composite material, and the dispersant, melting and plasticizing through a twin-screw extruder, and water-cooling and pelletizing to obtain a PA6 fiber cool antibacterial masterbatch;

[0024] Step S2, adding the prepared PA6 fiber masterbatch and PA6 slices to a twin-screw extruder synchronously, the spinning melt obtained after blending and melting is further accurately metered by a metering pump, then extruded by a spinning assembly, cooled and formed, bundled and oiled, stretched and shaped, and wound on a bobbin, and finally prepared colored PA6 FDY; adding the PA6 fiber cool antibacterial masterbatch and PA6 slices to a twin-screw extruder synchronously, the spinning melt obtained after blending and melting is further accurately metered by a metering pump, then extruded by a spinning assembly, cooled and formed, bundled and oiled, stretched and shaped, and wound on a bobbin, and finally prepared cool antibacterial PA6 FDY;

[0025] Step S3, using colored PA6 FDY as core yarn and cool antibacterial PA6 FDY as skin yarn, after passing through raw yarn tube, scissor mouth, core yarn transmission roller FR3, skin yarn transmission roller FR4, air change box for wet deformation plying, DR roller, WR winding roller, a two-color cool antibacterial cotton-like PA6 filament with a coil or arc structure is formed. The carrier PA6 slice in step S1 refers to one or more of full matte FD, semi-gloss SD, and glossy BR, and the colorant refers to one or more of inorganic pigments such as titanium dioxide, carbon black, cadmium red, cobalt blue, and cadmium yellow. The cool antibacterial composite material in step S1 refers to one or more of inorganic substances such as jade powder, mica powder, pearl powder, copper antibacterial agent, titanium dioxide photocatalyst antibacterial agent, etc. The dispersant in step S1 refers to one or more of amide wax, esterified wax, polyethylene wax, silicon dioxide, 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 uniformly" is further as follows: after the carrier PA6 slices, colorant and dispersant are vacuum dried, they are fully stirred and evenly mixed according to the mass percentage of 74%: 18%: 8% to 78%: 19%: 3%; the step S1 of "mixing the carrier PA6 slices, cool antibacterial composite material and dispersant uniformly" is further as follows: after the carrier PA6 slices, cool antibacterial composite material and dispersant are vacuum dried, they are evenly mixed according to the mass percentage of 74%: 20%: 6% to 80%: 15%: 5%; wherein the carrier PA6 slices, colorant, dispersant and the carrier PA6 slices, colorant and dispersant are fully stirred according to the mass percentage of 80%: 16%: 4% to 70%: 20%: 10%, the mixing speed is 800 to 1000 r / min, and the mixing time is 60 to 120 min.

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

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

[0029] Please continue reading Figure 1As shown, in one embodiment of the present invention, the temperatures of zone 1, zone 2, zone 3, zone 4 and zone 5 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 38-42rpm.

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

[0031] Please continue reading Figure 1 As shown, in one embodiment of the present invention, the side blowing method is adopted in the cooling molding in the step S2, the side blowing cooling temperature is 19-23°C, and the wind speed is 0.45-0.55 m / s to ensure the uniformity of the filament bundle; the vertical distance between the bundle oiling point and the spinneret in the spinning assembly is 700-1100 mm, and the vertical distance from the wind window 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 speeds of the first stretching guide roller and the second stretching guide roller in the stretching and shaping are 3500-3700 m / min, and the number of wire hanging circles of the first stretching guide roller and the second stretching guide roller is 2.5 circles; the speeds of the third shaping drawing guide roller and the fourth drawing guide roller are 4500-4900 m / min, and the number of wire hanging circles of the third shaping drawing guide roller and the fourth drawing guide roller is 5.5 circles, wherein 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 bobbin is 4800 m / min, and the winding forming angle of the WR winding roller is 5.50-8.00°. The first drawing godet roller and the second drawing godet roller form a first pair of godet rollers GR1, and the third shaping drawing godet roller and the fourth drawing godet roller form a second pair of godet rollers GR2.

[0033] Please continue reading Figure 1 As shown, in one embodiment of the present invention, the overfeed rate of the core yarn transmission roller FR3 in step S3 is 10-18%, the overfeed rate of the skin yarn transmission roller FR4 is 20-30%, the core yarn water supply is 0.80-1.20 L / h, the network air pressure of the air change 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 skin layer and a core layer, the core layer is a colored PA6 FDY filament, and the skin layer is a cool and antibacterial PA6 FDY filament.

[0035] Example 1

[0036] (1) The carrier PA6-FD slices, carbon black inorganic pigment and stearic acid dispersant were vacuum dried at 100° C. for 12 h. Then, they were added to the feeding bin 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;

[0037] (2) melting and plasticizing the composite material through a twin-screw extruder, wherein the temperatures of the twin-screw extrusion sections are 208° C., 220° C., 230° C., and 240° C., respectively, and the head temperature is 240° C., thereby melting and plasticizing;

[0038] (3) The melt passes through a circular orifice die and is extruded to form a strip at an extrusion speed of 80 r / min. The strip is further cooled in a water tank and pulled to a pelletizer for pelletizing to obtain cylindrical granules with a smooth surface and uniform particle size.

[0039] (4) drying the granulated material in a vacuum oven at 80° C. for 12 h to obtain a carbon black masterbatch for PA6 fiber having an average length of 3.50±0.1 mm and an average diameter of 2.50±0.2 mm;

[0040] (5) The dried 96% PA6 FD chips and 4% PA6 fiber carbon black masterbatch were mixed evenly in a mixing bin, and then melt-extruded through a twin-screw extruder, where the temperatures of the first, second, third, fourth, and fifth zones were 254° C., 255° C., 256° C., 257° C., and 258° C., respectively, and the rotation speed was 39 rpm;

[0041] (6) The metering pump frequency is selected to be 40 Hz, the filter screen specification in the spinneret is 77×6×20μ, the melt is extruded through the spinning assembly, and the assembly pressure is 65 kg / cm 2 , forming a thin melt flow;

[0042] (7) Cooling and shaping into a uniform filament bundle under the condition of side blowing temperature of 19°C and wind speed of 0.48m / s. Further bundling and oiling, the vertical distance between the oil bundling point and the spinneret is 1000mm, and the vertical distance between the oil bundling point and the wind window is 175mm. Imported Takemoto oil 6352AY is used, the oil concentration is 8%, the oil pump frequency is 56Hz, and the oil pump specification is 0.16cc / r to obtain primary fiber;

[0043] (8) The spun fibers were pre-networked, the pre-network air pressure was 1.35 bar, the GR1 speed was 3620 m / min, the number of wire loops was 2.5, the GR2 speed was 4880 m / min, the number of wire loops was 5.5, and the heating temperature of the third shaping godet roller was 160° C. The main network air pressure was 3.65 bar, and the speed of the fifth godet roller was 4800 m / min.

[0044] (9) After a winding process, the winding speed was 4800 m / min, the initial value of the winding forming angle was 6.00, and the winding forming angles along the winding motion were 6.30, 6.60, 7.00, 7.30, 7.70, 7.50, 7.20, and 6.40, respectively, to obtain 70D / 34F FD black PA6 FDY filament.

[0045] Example 2

[0046] (1) The carrier PA6-SD slices, cadmium red inorganic pigment, amide wax and polyethylene wax dispersant were vacuum dried at 100°C for 12 hours. Then, they were added to the feeding bin in a mass percentage of 77%:19%:2%:2%, and fully mixed for 60 minutes at a mixing speed of 800 r / min to obtain a uniformly mixed composite material;

[0047] (2) melting and plasticizing the composite material through a twin-screw extruder, wherein the temperatures of the twin-screw extrusion sections are 209° C., 222° C., 234° C., and 240° C., respectively, and the head temperature is 240° C., thereby melting and plasticizing;

[0048] (3) The melt passes through a circular orifice die and is extruded to form a strip at an extrusion speed of 82 r / min. The strip is further cooled in a water tank and pulled to a pelletizer for pelletizing to obtain cylindrical granules with a smooth surface and uniform particle size.

[0049] (4) drying the granular material in a vacuum oven at 80° C. for 12 h to obtain a red masterbatch for PA6 fiber having an average length of 3.50±0.2 mm and an average diameter of 2.50±0.3 mm;

[0050] (5) The dried 97% PA6 FD chips and 3% PA6 fiber red masterbatch were mixed evenly in a mixing bin, and then melt-extruded through a twin-screw extruder. The temperatures of the first, second, third, fourth, and fifth zones were 254°C, 256°C, 257°C, 258°C, and 259°C, respectively, and the rotation speed was 40 rpm;

[0051] (6) The metering pump frequency is selected to be 40 Hz, the filter screen specification in the spinneret is 77×6×20μ, the melt is extruded through the spinning assembly, and the assembly pressure is 65 kg / cm 2 , forming a thin melt flow;

[0052] (7) Cooling and shaping into a uniform filament bundle under the condition of side blowing temperature of 20°C and wind speed of 0.45m / s. Further bundling and oiling, the vertical distance between the oil bundling point and the spinneret is 700mm, and the vertical distance between the oil bundling point and the wind window is 190mm. Imported Takemoto oil 6352AY is used, the oil concentration is 8%, the oil pump frequency is 54Hz, and the oil pump specification is 0.16cc / r to obtain primary fiber;

[0053] (8) The spun fibers were pre-networked, the pre-network air pressure was 1.40 bar, the GR1 speed was 3650 m / min, the number of wire loops was 2.5, the GR2 speed was 4515 m / min, the number of wire loops was 5.5, and the heating temperature of the third shaping godet roller was 158° C. The main network air pressure was 3.70 bar, and the speed of the fifth godet roller was 4500 m / min.

[0054] (9) After a winding process, the winding speed was 4800 m / min, the initial value of the winding forming angle was 5.50, and the winding forming angles along the winding motion were 6.10, 6.70, 7.30, 7.80, 7.50, 6.80, 6.50, and 6.00, respectively, to obtain 20D / 24F SD red PA6 FDY filament.

[0055] Example 3

[0056] (1) After the carrier PA6-FD slices, jade powder, mica powder, copper-based antibacterial agent, amide wax and polyethylene wax dispersant were vacuum dried at 100° C. for 12 h, they were added to the feeding bin in a mass percentage of 79%: 3%: 5%: 8%: 2%: 3%, and mixed thoroughly for 80 min at a mixing speed of 1000 r / min to obtain a uniformly mixed composite material;

[0057] (2) melting and plasticizing the composite material through a twin-screw extruder, wherein the temperatures of the twin-screw extrusion sections are 210° C., 225° C., 235° C., and 240° C., respectively, and the head temperature is 240° C., thereby melting and plasticizing;

[0058] (3) The melt passes through a circular orifice die and is extruded to form a strip at an extrusion speed of 84 r / min. The strip is further cooled in a water tank and pulled to a pelletizer for pelletizing to obtain a cylindrical granular material with a smooth surface and uniform particle size;

[0059] (4) The granular material was dried in a vacuum oven at 80° C. for 12 h to obtain a cool 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.

[0060] (5) The dried 95% PA6 FD slices and 5% PA6 fiber cool antibacterial masterbatch were mixed evenly in a mixing bin, and then melt-extruded through a twin-screw extruder, with the temperatures of the first, second, third, fourth, and fifth zones being 255° C., 256° C., 257° C., 258° C., and 258° C., respectively, and the rotation speed being 41 rpm;

[0061] (6) The metering pump frequency is selected to be 42 Hz, the non-woven filter mesh specifications in the spinneret are 77×6×20μ, the melt is extruded through the spinning assembly, and the assembly pressure is 168 kg / cm 2 , forming a thin melt flow;

[0062] (7) Cooling and shaping into a uniform filament bundle under the condition of side blowing temperature of 20°C and wind speed of 0.50m / s. Further bundling and oiling, the vertical distance between the oil bundling point and the spinneret is 800mm, and the vertical distance between the oil bundling point and the wind window is 200mm. Imported Takemoto oil 6352AY is used, the oil concentration is 8%, the oil pump frequency is 55Hz, and the oil pump specification is 0.16cc / r, to obtain primary fiber;

[0063] (8) The spun fibers were pre-networked, the pre-network air pressure was 1.40 bar, the GR1 speed was 3700 m / min, the number of wire loops was 2.5, the GR2 speed was 4900 m / min, the number of wire loops was 5.5, and the heating temperature of the third shaping godet roller was 140° C. The main network air pressure was 3.80 bar, and the speed of the fifth godet roller was 4800 m / min.

[0064] (9) After a winding process, the winding speed is 4800 m / min, the initial value of the winding forming angle is 6.0, and the winding forming angles along 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 antibacterial PA6 FDY filament.

[0065] Example 4

[0066] (1) After the carrier PA6-SD slices, mica powder, zinc-based antibacterial agent, nano-titanium dioxide photocatalyst antibacterial agent, amide wax and stearic acid dispersant were vacuum dried at 100° C. for 12 h, they were added to the feeding bin in a mass percentage of 76%: 10%: 4%: 5%: 3%: 2%, and fully mixed for 60 min at a mixing speed of 1000 r / min to obtain a uniformly mixed composite material;

[0067] (2) melting and plasticizing the composite material through a twin-screw extruder, wherein the temperatures of the twin-screw extrusion sections are 210° C., 222° C., 238° C., and 240° C., respectively, and the die head temperature is 240° C., and then melting and plasticizing;

[0068] (3) The melt passes through a circular orifice die and is extruded to form a strip at an extrusion speed of 83 r / min. The strip is further cooled in a water tank and pulled to a pelletizer for pelletizing to obtain cylindrical granules with a smooth surface and uniform particle size.

[0069] (4) drying the granular material in a vacuum oven at 80° C. for 12 h to obtain a cool 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;

[0070] (5) The dried 95.5% PA6 FD chips and 4.5% PA6 fiber cool antibacterial masterbatch were mixed evenly in a mixing bin, and then melt-extruded through a twin-screw extruder, with the temperatures of zone 1, zone 2, zone 3, zone 4, and zone 5 being 255° C., 257° C., 258° C., 259° C., and 259° C., respectively, and the rotation speed being 42 rpm;

[0071] (6) The metering pump frequency is selected to be 59.60 Hz, the filter screen specification in the spinneret is 77×6×20μ, the melt is extruded through the spinning assembly, and the assembly pressure is 170 kg / cm 2 , forming a thin melt flow;

[0072] (7) Cooling and shaping into a uniform filament bundle under the condition of side blowing temperature of 22.5°C and wind speed of 0.52m / s. Further bundling and oiling, the vertical distance between the oil bundling point and the spinneret is 900mm, and the vertical distance between the oil bundling point and the wind window is 190mm. Imported Takemoto oil 6352AY is used, the oil concentration is 7%, the oil pump frequency is 61.7Hz, and the oil pump specification is 0.16cc / r to obtain primary fiber;

[0073] (8) The spun fibers are pre-networked, the pre-network air pressure is 1.30 bar, the GR1 speed is 3570 m / min, the number of wire loops is 2.5, the GR2 speed is 4865 m / min, the number of wire loops is 5.5, and the heating temperature of the third shaping godet roller is 165°C. The main network air pressure is 3.75 bar, and the speed of the fifth godet roller is 4820 m / min;

[0074] (9) After the winding process, the winding speed is 4800 m / min, the initial value of the winding forming angle is 5.50, and the winding forming angles along 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 antibacterial PA6 FDY filament.

[0075] Example 5

[0076] (1) The black PA6 FDY filament prepared in Example 1 was used as the air-change core yarn, and the cool antibacterial PA6 FDY filament prepared in Example 3 was used as the air-change skin yarn, which passed through the raw yarn tube and the scissor mouth respectively. The core yarn passed through the core yarn transmission roller (FR3), and the skin yarn passed through the skin yarn transmission roller (FR4), wherein the overfeed rate of FR3 was 14%, and the overfeed rate of FR4 was 25%.

[0077] (2) The core yarn is then wetted by a water nozzle in an air deformation box, deformed and plied together with the skin yarn through an air deformation nozzle, and passed through DR rollers and WR winding rollers to form a two-color cool antibacterial cotton-like PA6 filament with a loop or arc structure. The water supply is 0.80 L / h, the air pressure of the air deformation box network 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.

[0078] Example 6

[0079] (1) The red PA6 FDY filament prepared in Example 2 was used as the air-change core yarn, and the cool antibacterial PA6 FDY filament prepared in Example 4 was used as the air-change skin yarn, which passed through the raw yarn tube and the scissor mouth respectively. The core yarn passed through the core yarn transmission roller (FR3), and the skin yarn passed through the skin yarn transmission roller (FR4), wherein the overfeed rate of FR3 was 15%, and the overfeed rate of FR4 was 26%.

[0080] (2) The core yarn is then wetted by a water nozzle in an air deformation box, deformed and plied together with the skin yarn through an air deformation nozzle, and passed through a DR roller and a WR winding roller to form a two-color cool antibacterial cotton-like PA6 filament with a loop or arc structure. The water supply is 0.90 L / h, the air pressure of the air deformation box 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.

[0081] The physical properties of the fibers of Examples 5-6 were tested, and the results are shown in Table 1 below.

[0082]

[0083] Table 1 Physical property indicators of Examples 5-6 Fabric 1 and Fabric 2 were tested for cool feeling and antibacterial function by a third-party testing agency, and the results are shown in Table 2 below.

[0084]

[0085]

[0086] Table 2 Results of testing the cool antibacterial function of fabric 1 and fabric 2

[0087] The above description is only a preferred embodiment of the present invention and should not be construed as limiting the present application. All equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A method for preparing a two-color cool antibacterial cotton-like PA6 filament, characterized in that: The steps include: Step S1, uniformly blending the carrier PA6 slices, the colorant, and the dispersant, melting and plasticizing through a twin-screw extruder, and water-cooling and pelletizing to obtain a PA6 fiber masterbatch; uniformly blending the carrier PA6 slices, the cool antibacterial composite material, and the dispersant, melting and plasticizing through a twin-screw extruder, and water-cooling and pelletizing to obtain a PA6 fiber cool antibacterial masterbatch; Step S2, adding the prepared PA6 fiber masterbatch and PA6 chips to a twin-screw extruder simultaneously, and the spinning melt obtained after blending and melting is further accurately metered by a metering pump, and then extruded by a spinning assembly, cooled and formed, bundled and oiled, stretched and shaped, and wound on a bobbin, and finally a colored PA6 FDY is prepared; The cool antibacterial masterbatch for PA6 fiber and PA6 chips are added to the twin-screw extruder simultaneously, and the spinning melt obtained after blending and melting is further accurately metered by a metering pump, and then extruded by a spinning assembly, cooled and formed, bundled and oiled, stretched and shaped, and wound on a bobbin to finally prepare the cool antibacterial PA6 FDY; Step S3, using colored PA6 FDY as core yarn and cool antibacterial PA6 FDY as skin yarn, after passing through raw yarn tube, scissor mouth, core yarn transmission roller FR3, skin yarn transmission roller FR4, air change box for wet deformation plying, DR roller, WR winding roller, a two-color cool antibacterial cotton-like PA6 filament with a loop or arc structure is formed.

2. The method for preparing a two-color cool antibacterial cotton-like PA6 filament according to claim 1, characterized in that: The step S1 of "mixing the carrier PA6 slices, colorant and dispersant uniformly" is further as follows: after vacuum drying the carrier PA6 slices, colorant and dispersant, fully stir and mix them in a mass percentage of 74%: 18%: 8% to 78%: 19%: 3%; the step S1 of "mixing the carrier PA6 slices, cool antibacterial composite material and dispersant uniformly" is further as follows: after vacuum drying the carrier PA6 slices, cool antibacterial composite material and dispersant, mix them in a mass percentage of 74%: 20%: 6% to 80%: 15%: 5%; the mixing speed is 800 to 1000 r / min, and the mixing time is 60 to 120 min.

3. The method for preparing a two-color cool antibacterial cotton-like PA6 filament according to claim 1, characterized in that: The twin-screw extrusion section temperatures of the twin-screw extruder 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 80-84r / min.

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

5. The method for preparing a two-color cool antibacterial cotton-like PA6 filament according to claim 1, characterized in that: 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.

6. The method for preparing a two-color cool antibacterial cotton-like PA6 filament according to claim 1, characterized in that: The metering pump frequency in step S2 is 40-60 Hz, and the specification of the non-woven filter in the spinning assembly is 77×6×20μ.

7. The method for preparing a two-color cool antibacterial cotton-like PA6 filament according to claim 1, characterized in that: The side blowing method is adopted in the cooling and forming in step S2, the side blowing cooling temperature is 19-23°C, the wind speed is 0.45-0.55m / s, the vertical distance between the clustering oiling point and the spinneret in the spinning assembly is 700-1100mm, and the vertical distance from the wind window is 165-190mm.

8. The method for preparing a two-color cool antibacterial cotton-like PA6 filament according to claim 1, characterized in that: 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 speeds of the first and second stretching guide rollers in the stretching and shaping process are 3500-3700 m / min, and the number of wire loops of the first and second stretching guide rollers is 2.5; the speeds of the third and fourth shaping drawing guide rollers are 4500-4900 m / min, and the number of wire loops of the third and fourth shaping drawing guide rollers is 5.5, wherein 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 bobbin is 4800 m / min, and the winding forming angle is 5.50-8.00°.

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

10. A filament prepared by the method for preparing the double-color cool antibacterial cotton-like PA6 filament according to claim 1, characterized in that: The filament comprises a skin layer and a core layer, the core layer is a colored PA6 FDY filament, and the skin layer is a cool and antibacterial PA6 FDY filament.

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