Multicolor composite fiber bundle as well as preparation method and application thereof

Abstract

The invention provides a multicolor composite fiber bundle as well as a preparation method and application thereof, and belongs to the technical field of chemical fibers. A plurality of screw extruders are synchronously arranged, nylon 6, color master batch and an anti-aging agent are added according to a specific proportion, four-temperature-zone gradient melting and trefoil spinneret plate spinning are performed, and the processes of upper and lower layer different-temperature and different-speed air cooling, oiling stretching and the like are matched, so that the prepared fiber bundle is excellent in mechanical property and low in monofilament variation coefficient. According to the method, the defects of a traditional dyeing process are avoided, the anti-aging agent and the color master batch are fused and mixed, so that the fiber is uniform in color, resistant to migration and high in ultraviolet stability, and an automobile carpet prepared from the fiber bundle is high in color fastness and good in wear resistance and meets the strict requirements of automobile interiors.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical fibers, and particularly relates to a multi-color composite fiber bundle, a preparation method thereof and an application thereof. Background Art

[0002] Due to its rich visual effects, multi-color silk is widely used in fields such as clothing, home textiles and decorations. Traditional multi-color silk includes the processes of stock dyeing and post-dyeing. Among them, the post-dyeing process usually obtains multi-color silk by dyeing on white raw silk. For example, Patent CN114427133A discloses a multi-color composite embroidery dyeing process and equipment, including the following steps: Step 1, hot wire twisting of spandex filaments; Step 2, primary high-temperature setting; Step 3, high-temperature quenching into powder and then making into an elastic fabric after falling off. However, the binding degree between the dye and the fiber in the multi-color silk prepared in this way is not firm, resulting in problems such as dye shedding, color bleeding, etc.

[0003] The multi-color silk prepared by stock dyeing includes a core-shell structure, a side-by-side structure, etc. Among them, the core-shell structure composite fiber bundle is composed of two or more polymers, and one component (core layer) is completely wrapped by another component (skin layer) to form a concentric layered structure of "skin wrapping core"; the side-by-side structure is that two or more polymers are compounded into one fiber in a parallel and side-by-side manner. The multi-color silk fibers prepared by the above two methods will also have problems such as poor color fastness, color migration and interfacial peeling, resulting in turbid colors of the fabric.

[0004] CN103966673A discloses a fine-denier nylon raw material blend spinning masterbatch, which is prepared by nylon pulverization and pressure molding. The nylon is pulverized into powder and mixed with a molten spinning additive powder to obtain a main material, and the main material is pressure molded. During the pressure molding process, components such as a dispersant, a binder, a disintegrant, a co-solvent, a lubricant, and a coating agent are optionally added. The fiber filaments prepared by the conventional method of preparing multi-color silk by melt blending have insufficient fluffiness and low color saturation.

[0005] In summary, the processes for preparing multi-color silk include two types: stock dyeing and post-dyeing. Since the post-dyeing process easily causes color bleeding and mixing between fiber filaments after light exposure or washing, the stock dyeing method is mostly used for preparation. However, with the continuous increase in the requirements for the quality and color of fabrics, problems such as poor color fastness, poor fluffiness and poor color saturation of fiber filaments still need to be solved urgently. Summary of the Invention

[0006] In view of the above problems, the present invention provides a multi-color composite fiber bundle, a preparation method and an application thereof. By setting different screw extruders and synchronously adding color masterbatches of different colors thereto for melting, spinning, puffing, stretching, etc. are carried out under specific conditions, and finally winding and bobbin-changing are carried out to prepare the multi-color composite fiber bundle. The multi-color composite fiber bundle has good mechanical properties, high color fastness and low coefficient of variation.

[0007] The present invention provides a multi-color composite fiber bundle which is prepared by melting nylon 6 mixed color masterbatch and anti-aging agent by synchronously arranged screw extruders and then through spinning and puffing processes. The color difference of the color space (CIELab) of the multi-color composite fiber bundle is that the lightness color difference (ΔL) is 26.47, the red-green axis color difference (Δa) is 2.43, and the yellow-blue axis color difference (Δb) is 8.54. The breaking strength of the multi-color composite fiber bundle is 2.5 - 2.8 cN / dtex, the breaking elongation is 45 - 50%, and the oil content is 0.85 - 1%. The total crimp of the multi-color composite fiber bundle is 17 - 20%, the fineness is 2600 - 2650 D, the number of holes is 150 - 180, and the coefficient of variation of the fineness of the monofilaments in the multi-color composite fiber bundle is 0.5 - 1.6%. The color difference (ΔE) of the multi-color composite fiber bundle after being irradiated with ultraviolet rays for 500 h is ≤1.5.

[0008] The present invention also provides a preparation method of the multi-color composite fiber bundle, comprising the following steps: Step 1: Stir and blend nylon 6, color masterbatch granules and anti-aging agent, and then dry to obtain a premixed masterbatch. Step 2: Melt and blend the premixed masterbatch respectively by synchronously arranged screw extruders, and then carry out spinning through spinnerets respectively. After spinning, air cooling is carried out in an air cooling device to obtain three cooling fiber filaments of different colors. Step 3: Oil the cooling fiber filaments respectively, then carry out stretching together through stretching rollers, continue high-temperature puffing, then cool and enter a spinning networker for network processing, and finally wind and bobbin-change with a winder to obtain a finished multi-color composite fiber bundle.

[0009] Further, the number of the premixed masterbatches in Step 1 is ≥3. At this time, the number of types of the color masterbatch granules is ≥3, which is the same as the number of the premixed masterbatches.

[0010] Further, the color masterbatch granules of different colors are respectively blended with the nylon 6 and the anti-aging agent.

[0011] Further, the mass ratio of the nylon 6, the masterbatch, and the anti-aging agent in the step 1 is (88 - 95):(4 - 9):(0.5 - 3).

[0012] Further, the anti-aging agent in the step 1 is a hindered amine type anti-aging agent.

[0013] Further, the components in the hindered amine type anti-aging agent are one or two of caprolactam, N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,3-benzenedicarboxamide, and N,N'-1,6-hexanediylbis[N-(2,2,6,6-tetramethyl-4-piperidyl)]-formamide.

[0014] Further, the stirring speed in the step 1 is 300 - 500 rpm, and the stirring time is 3 - 5 min.

[0015] Further, the drying temperature in the step 1 is 100 - 150 °C, the drying time is 2 - 4 h, and the water content in the dried material is ≤ 0.08%.

[0016] Further, the temperature of the screw extruder in the step 2 is 240 - 275 °C, which is divided into four temperature zones. The temperature of the first temperature zone is 240 - 250 °C, the temperature of the second temperature zone is 260 - 270 °C, the temperature of the third temperature zone is 265 - 275 °C, and the temperature of the fourth temperature zone is 260 - 270 °C.

[0017] Further, the spinneret plate in the step 2 is a three-lobed spinneret plate with 50 - 60 holes.

[0018] Further, the spinning speed in the step 2 is 2500 - 3000 m / min, and the fineness of the monofilament is 10 - 18 D.

[0019] Further, the humidity of the air cooling in the step 2 is 80 - 85%RH.

[0020] Further, the air cooling device in the step 2 is divided into upper and lower layers. The temperature of the upper layer is 15 - 18 °C, and the wind speed is 0.1 - 0.3 m / s. The temperature of the lower layer is 20 - 25 °C, and the wind speed is 0.3 - 0.5 m / s.

[0021] Further, the oiling rate in the step 3 is 0.9 - 1%.

[0022] Further, the temperature of the stretching roller in the step 3 is 160 - 170 °C, and the stretching ratio is 3 - 3.5.

[0023] Further, in the step 3, the temperature of the high-temperature puffing is 180-190 °C, and the pressure is 0.1-0.25 MPa.

[0024] Further, in the step 3, the number of network knots in the network processing is 33-36.

[0025] Further, in the step 3, the winding speed of the winder is 2000-2500 m / min.

[0026] The present invention also provides an automotive carpet, which is prepared by using the multi-color composite fiber bundle as the pile layer material; the grammage of the multi-color composite fiber bundle in the automotive carpet is 300-400 g / m 2 , and the fluff retention rate of the automotive carpet is ≥90% after 50,000 times of friction; The color fastness of the automotive carpet is: dry rubbing color fastness ≥4 levels, wet rubbing color fastness ≥3.5 levels, and light fastness ≥7 levels.

[0027] Advantages of the present invention: 1. In the present invention, by synchronously setting multiple screw extruders and synchronously adding nylon 6, masterbatch, and anti-aging agent in specific proportions in the synchronously set screw extruders, problems such as poor color fastness and large color difference of fibers caused by traditional dyeing processes are avoided. Through the gradient control of four temperature zones, the raw materials are first melted to avoid carbonization of the materials due to too high temperature. After the masterbatch and anti-aging agent are evenly dispersed, the melt flow is maintained in the last temperature zone, and spinning is carried out in cooperation with the spinneret. The spinneret in the present invention is a three-lobed spinneret, and the three-lobed structure increases the mechanical properties of the fiber and can improve the color gloss of the final product at the same time. In the present invention, after the melt is spun, the fibers are cooled by the air cooling conditions with different temperatures and speeds in the upper and lower layers. The setting of the gradient temperature avoids the adhesion between the fibers and enables the internal crystallization of the fibers to be uniform, thereby reducing the coefficient of variation of the monofilaments. The cooled fibers are oiled and stretched, which improves the molecular chain orientation and strength of the fibers, and finally improves the mechanical properties such as the breaking strength of the fiber filaments, while maintaining the color fastness of the fibers, etc.; 2. In the present invention, by melting nylon 6, masterbatch, and anti-aging agent together, the anti-aging agent shields ultraviolet light and captures free radicals in the molten state, which ensures the color fastness of the fiber filaments during use. The way of melting and mixing the masterbatch during the mixing process makes the color of the fibers uniform and has migration resistance. At the same time, the anti-aging agent can also protect the molecules of the material, and finally makes the automotive carpet prepared from the fiber bundle in the present invention have extremely high color fastness. Description of the drawings

[0028] Figure 1 It is a finished product diagram of the multi-color composite fiber bundle in Embodiment 1; Figure 2This is the finished product drawing of the automotive carpet described in Example 1. Detailed implementation mode

[0029] The following is a detailed description of the invention in conjunction with the embodiments: The present invention provides a multi-color composite fiber bundle, its preparation method and application. Through a specific preparation method, its mechanical properties and color fastness are greatly improved.

[0030] Example 1 This embodiment provides a multi-color composite fiber bundle, which is prepared by a screw extruder set synchronously melting nylon 6, color masterbatch and anti-aging agent and then through spinning and swelling processes; The color difference of the color space (CIELab) of the multi-color composite fiber bundle is that the lightness L is 45.66, the red-green axis a is -17.74, and the yellow-blue axis b is 9.3; The breaking strength of the multi-color composite fiber bundle is 2.67 cN / dtex, the breaking elongation is 45.8%, and the oil content is 0.94%; The total crimp of the multi-color composite fiber bundle is 19.6%, the fineness is 2608 D, the number of holes is 150, and the coefficient of variation of the fineness of the single filament in the multi-color composite fiber bundle is 0.5%; The color difference (ΔE) of the multi-color composite fiber bundle after being irradiated with ultraviolet light for 500 h is ≤1.5.

[0031] This embodiment also provides a preparation method of the multi-color composite fiber bundle, including the following steps: Step 1: Prepare the components of premixed masterbatch 1: nylon 6, gray masterbatch and anti-aging agent with a mass ratio of 88:9:3; The components of premixed masterbatch 2: nylon 6, white masterbatch and anti-aging agent with a mass ratio of 88:9:3; The components of premixed masterbatch 3: nylon 6, black masterbatch and anti-aging agent with a mass ratio of 88:9:3; After mixing the components in the premixed masterbatch 1, the premixed masterbatch 2, and the premixed masterbatch 3 respectively at 300 rpm for 5 min, drying at 150 °C for 2 h until the moisture content of the material is ≤0.08%, three different premixed masterbatches are obtained; Step 2: Melt and blend the three portions of the premixed masterbatch respectively using three simultaneously set screw extruders. The processing temperature of the screw extruders is 240 - 265°C, divided into four temperature zones. The temperature of the first zone is 240°C, the second zone is 260°C, the third zone is 265°C, and the fourth zone is 265°C. Then, spin the mixture through a 50-hole trilobal spinneret respectively. The spinning speed is 2,800 m / min, and the fineness of the monofilament is 18 D. After spinning, in an air cooling device at 80% RH, air cooling is carried out. The air cooling device is divided into upper and lower layers. The temperature of the upper layer is 18°C, and the wind speed is 0.1 m / s. The temperature of the lower layer is 25°C, and the wind speed is 0.3 m / s. After air cooling, three different colored cooled fiber filaments are obtained. Step 3: Oil the cooled fiber filaments respectively, with an oiling rate of 0.95%. After oiling, stretch them together at 160°C with a magnification of 3.5 using a stretching roller. Then, continue to carry out high-temperature expansion at 180°C and 0.25 MPa, and then cool and enter a spinning networker for network processing. The number of network knots for the network processing is 33. Finally, wind and wind up the product using a winding machine. The winding speed of the winding machine is 2,000 m / min, and a finished multi-color composite fiber bundle is obtained.

[0032] This embodiment also provides an automotive carpet, which is prepared using the multi-color composite fiber bundle as the pile layer material; the weight per unit area of the multi-color composite fiber bundle in the automotive carpet is 400 g / m 2 , and the fluff retention rate of the automotive carpet is ≥90% after 50,000 times of friction; The color fastness of the automotive carpet is: dry rubbing color fastness is 4 levels, wet rubbing color fastness is 3.5 levels, and light fastness is 7 levels.

[0033] As Figure 1 shown in the finished product diagram of the multi-color composite fiber bundle in Embodiment 1, and Figure 2 shown in the finished product diagram of the automotive carpet in Embodiment 1. In the figure, the color of the automotive carpet prepared from the multi-color composite fiber bundle is uniform, and the color contrast of the multi-color composite fiber bundle is clear.

[0034] Embodiment 2 This embodiment provides a multi-color composite fiber bundle, which is prepared by melting nylon 6 mixed color masterbatch and anti-aging agent using a simultaneously set screw extruder and then through spinning and expansion processes; The color difference in the color space (CIELab) of the multi-color composite fiber bundle is: lightness L is 68.36, red-green axis a is -16.25, and yellow-blue axis b is 9.3; The breaking strength of the multi-color composite fiber bundle is 2.61 cN / dtex, the breaking elongation rate is 47.46%, and the oil content is 0.98%; The total crimp of the multi-color composite fiber bundle is 18.99%, the fineness is 2612 D, the number of holes is 165, and the coefficient of variation of the fineness of the monofilaments in the multi-color composite fiber bundle is 0.88%; The color difference (ΔE) of the multi-color composite fiber bundle after being irradiated with ultraviolet light for 500 h is ≤ 1.5.

[0035] This embodiment also provides a method for preparing the multi-color composite fiber bundle, including the following steps: Step 1: Prepare the components of the first premixed masterbatch: nylon 6, a gray masterbatch, and an anti-aging agent with a mass ratio of 95:4.5:0.5; The components of the second premixed masterbatch: nylon 6, a blue masterbatch, and an anti-aging agent with a mass ratio of 95:4.5:0.5; The components of the third premixed masterbatch: nylon 6, a white masterbatch, and an anti-aging agent with a mass ratio of 95:4.5:0.5; After respectively mixing the components in the first premixed masterbatch, the second premixed masterbatch, and the third premixed masterbatch at 400 rpm for 4 min, drying at 120 °C for 3 h until the moisture content of the material is ≤ 0.08%, three different premixed masterbatches are obtained; Step 2: Melt and blend the three premixed masterbatches respectively with three simultaneously set screw extruders. The processing temperature of the screw extruder is 240 - 265 °C, which is divided into four temperature zones. The temperature of the first temperature zone is 240 °C, the temperature of the second temperature zone is 260 °C, the temperature of the third temperature zone is 265 °C, and the temperature of the fourth temperature zone is 265 °C. Then, spin through a 55-hole trilobal spinneret respectively. The spinning speed is 2800 m / min, the fineness of the spun monofilament is 15 D. After spinning, in an air cooling device at 80% RH, the air cooling device is divided into upper and lower layers. The temperature of the upper layer is 15 °C, the wind speed is 0.3 m / s, the temperature of the lower layer is 20 °C, and the wind speed is 0.5 m / s. After air cooling, three different colored cooled fiber filaments are obtained; Step 3: Oil the cooled fiber filaments respectively, with an oiling rate of 1%. After oiling, stretch them together at 160 °C with a magnification of 3.5 through a stretching roller. Then, continue to perform high-temperature puffing at 180 °C and 0.2 MPa, and then cool and enter a spinning networker for network processing. The number of network knots of the network processing is 34. Finally, wind and wind up the bobbin with a winding machine, and the winding speed of the winding machine is 2500 m / min to obtain a finished multi-color composite fiber bundle.

[0036] This embodiment also provides an automotive carpet, which is prepared with the multi-color composite fiber bundle as the pile layer material; the grammage of the multi-color composite fiber bundle in the automotive carpet is 350 g / m 2 , and the fluff retention rate of the automotive carpet after 50,000 times of friction is ≥ 90%; The color fastness of the automotive carpet is as follows: the dry rubbing color fastness is grade 4, the wet rubbing color fastness is grade 4, and the light color fastness is 7.5 grade.

[0037] Example 3 This example provides a multi-color composite fiber bundle, which is prepared by melting nylon 6 mixed color masterbatch and anti-aging agent by a synchronously set screw extruder and then through spinning and bulking processes; The color difference in the color space (CIELab) of the multi-color composite fiber bundle is that the lightness L is 44.78, the red-green axis a is -15.7, and the yellow-blue axis b is 1.06; The breaking strength of the multi-color composite fiber bundle is 2.65 cN / dtex, the breaking elongation rate is 49.44%, and the oil content is 0.89%; The total crimp ratio of the multi-color composite fiber bundle is 17.97%, the fineness is 2608 D, the number of holes is 180, and the coefficient of variation of the fineness of the single filament in the multi-color composite fiber bundle is 0.91%; The color difference (ΔE) of the multi-color composite fiber bundle after being irradiated with ultraviolet light for 500 h is ≤1.5.

[0038] This example also provides a preparation method of the multi-color composite fiber bundle, including the following steps: Step 1, prepare the components of premixed masterbatch 1: nylon 6, gray masterbatch, and anti-aging agent with a mass ratio of 92:7:1; The components of premixed masterbatch 2: nylon 6, red masterbatch, and anti-aging agent with a mass ratio of 92:7:1; The components of premixed masterbatch 3: nylon 6, blue masterbatch, and anti-aging agent with a mass ratio of 92:7:1; Respectively stir the components in the premixed masterbatch 1, the premixed masterbatch 2, and the premixed masterbatch 3 at 500 rpm for 3 min for blending, and then dry at 100 °C for 4 h until the moisture content of the material is ≤0.08% to obtain three different premixed masterbatches; Step 2, melt and blend the three premixed masterbatches respectively with three synchronously set screw extruders. The processing temperature of the screw extruder is 240 - 265 °C, which is divided into four temperature zones. The temperature of the first temperature zone is 240 °C, the temperature of the second temperature zone is 260 °C, the temperature of the third temperature zone is 265 °C, and the temperature of the fourth temperature zone is 265 °C. Then, spin through a 60-hole trilobal spinneret respectively. The spinning speed is 2500 m / min, and the fineness of the single filament for spinning is 10 D. After spinning, under 80% RH, carry out air cooling in an air cooling device. The air cooling device is divided into upper and lower layers. The temperature of the upper layer is 15 °C, the wind speed is 0.3 m / s, the temperature of the lower layer is 25 °C, and the wind speed is 0.5 m / s. After air cooling, three different color cooled fiber filaments are obtained; Step 3: Oil the cooling fiber filaments respectively with an oiling rate of 1%. After oiling, stretch them together at 160°C with a magnification of 3.5 by a stretching roller. Then, after high-temperature expansion at 180°C and 0.25 MPa, cool them and enter a spinning networker for network processing. The number of network knots in the network processing is 35. Finally, wind and bobbin them with a winding machine at a winding speed of 2000 m / min to obtain a finished multi-color composite fiber bundle.

[0039] This embodiment also provides an automotive carpet, which is prepared with the multi-color composite fiber bundle as the pile layer material; the grammage of the multi-color composite fiber bundle in the automotive carpet is 300 g / m 2 , and the fluff retention rate of the automotive carpet is ≥90% after 50,000 times of friction; The color fastness of the automotive carpet is: the dry rubbing color fastness is 4.5 levels, the wet rubbing color fastness is 3.5 levels, and the light fastness is 8 levels.

[0040] Example 4 This embodiment provides a multi-color composite fiber bundle, which is prepared by melting nylon 6 mixed color masterbatch and anti-aging agent with a synchronously set screw extruder and then through spinning and expansion processes; The color difference in the color space (CIELab) of the multi-color composite fiber bundle is: the lightness L is 71.25, the red-green axis a is -15.31, and the yellow-blue axis b is 9.28; The breaking strength of the multi-color composite fiber bundle is 2.78 cN / dtex, the breaking elongation rate is 45.36%, and the oil content is 0.94%; The total crimp ratio of the multi-color composite fiber bundle is 18.86%, the fineness is 2624 D, the number of holes is 150, and the coefficient of variation of the fineness of the single filament in the multi-color composite fiber bundle is 1.55%; The color difference (ΔE) of the multi-color composite fiber bundle after being irradiated with ultraviolet rays for 500 h is ≤1.5.

[0041] This embodiment also provides a preparation method of the multi-color composite fiber bundle, including the following steps: Step 1: Prepare the components of premixed masterbatch one: nylon 6, gray masterbatch, and anti-aging agent with a mass ratio of 94:4:2; The components of premixed masterbatch two: nylon 6, red masterbatch, and anti-aging agent with a mass ratio of 94:4:2; The components of premixed masterbatch three: nylon 6, black masterbatch, and anti-aging agent with a mass ratio of 94:4:2; Respectively stir the components in the premixed masterbatch one, the premixed masterbatch two, and the premixed masterbatch three at 300 rpm for 5 min for blending, and then dry them at 120°C for 2 h until the moisture content of the material is ≤0.08% to obtain three different premixed masterbatches; Step 2: Melt and blend the three portions of the premixed masterbatch respectively using three simultaneously set screw extruders. The processing temperature of the screw extruders is 240 - 265°C, divided into four temperature zones. The temperature of the first zone is 240°C, the second zone is 260°C, the third zone is 265°C, and the fourth zone is 265°C. Then, spin the mixture through a 50-hole trilobal spinneret respectively. The spinning speed is 3000 m / min, and the single filament fineness of the spun fiber is 15 D. After spinning, in an air cooling device under 80% RH, air cooling is carried out. The air cooling device is divided into upper and lower layers. The temperature of the upper layer is 18°C, and the wind speed is 0.3 m / s. The temperature of the lower layer is 25°C, and the wind speed is 0.5 m / s. After air cooling, three different colored cooled fiber filaments are obtained; Step 3: Oil the cooled fiber filaments respectively, with an oiling rate of 0.92%. After oiling, stretch them together at 160°C with a magnification of 3.5 using a stretching roller. Then, continue to perform high-temperature expansion at 190°C and 0.1 MPa, and then cool and enter a spinning networker for network processing. The number of network knots in the network processing is 36. Finally, wind and wind up the product using a winding machine. The winding speed of the winding machine is 2000 m / min, and a finished multi-color composite fiber bundle is obtained.

[0042] Example 5 This example provides a multi-color composite fiber bundle, which is prepared by melting nylon 6 mixed color masterbatch and anti-aging agent by a simultaneously set screw extruder and then through spinning and expansion processes; The color difference in the color space (CIELab) of the multi-color composite fiber bundle is that the lightness L is 69.94, the red-green axis a is -16.7, and the yellow-blue axis b is 9.6; The breaking strength of the multi-color composite fiber bundle is 2.58 cN / dtex, the breaking elongation rate is 47.02%, and the oil content is 0.99%; The total crimp percentage of the multi-color composite fiber bundle is 18.51%, the fineness is 2600 D, the number of holes is 150, and the coefficient of variation of the fineness of the single filaments in the multi-color composite fiber bundle is 1.44%; The color difference (ΔE) of the multi-color composite fiber bundle after being irradiated with ultraviolet light for 500 h is ≤1.5.

[0043] This example also provides a preparation method of the multi-color composite fiber bundle, including the following steps: Step 1: Prepare the components of premixed masterbatch 1: nylon 6, gray masterbatch, and anti-aging agent with a mass ratio of 94.5:5:0.5; The components of premixed masterbatch 2: nylon 6, red masterbatch, and anti-aging agent with a mass ratio of 94.5:5:0.5; Components of the premixed masterbatch three: nylon 6, blue masterbatch, and anti-aging agent with a mass ratio of 94.5:5:0.5; After respectively mixing the components in the first premixed masterbatch, the second premixed masterbatch, and the third premixed masterbatch at 300 rpm for 5 minutes, drying at 150 °C for 2 hours until the moisture content of the material ≤ 0.08%, three different premixed masterbatches are obtained; Step 2: Melt and blend the three premixed masterbatches respectively with three simultaneously set screw extruders. The processing temperature of the screw extruder is 240 - 265 °C, divided into four temperature zones, where the temperature of the first temperature zone is 240 °C, the temperature of the second temperature zone is 260 °C, the temperature of the third temperature zone is 265 °C, and the temperature of the fourth temperature zone is 265 °C. Then, spin through a 50-hole trilobal spinneret respectively, the spinning speed is 2800 m / min, the fineness of the single filament for spinning is 18 D. After spinning, in an air-cooling device at 85% RH, the air-cooling device is divided into upper and lower layers, the temperature of the upper layer is 18 °C, the wind speed is 0.3 m / s, the temperature of the lower layer is 25 °C, the wind speed is 0.5 m / s, and three different colored cooled fiber filaments are obtained after air-cooling; Step 3: Oil the cooled fiber filaments respectively, the oiling rate is 0.9%. After oiling, stretch them together at 170 °C with a magnification of 3 through a stretching roller, continue to perform high-temperature puffing at 180 °C and 0.25 MPa, then cool and enter a spinning networker for network processing. The number of network knots for the network processing is 35. Finally, wind and wind up the bobbin with a winding machine, and the winding speed of the winding machine is 2000 m / min to obtain a finished multi-color composite fiber bundle.

[0044] Comparative Example 1 This comparative example provides a multi-color composite fiber bundle, which is prepared by melting nylon 6, mixed color masterbatch, and anti-aging agent with a simultaneously set screw extruder through spinning and puffing processes; The breaking strength of the multi-color composite fiber bundle is 2.31 cN / dtex, the breaking elongation rate is 44.26%, and the oil content is 0.95%; The total crimp percentage of the multi-color composite fiber bundle is 17.59%, the fineness is 2612 D, the number of holes is 150, and the coefficient of variation of the fineness of the single filament in the multi-color composite fiber bundle is 6.1%.

[0045] This comparative example also provides a preparation method of the multi-color composite fiber bundle, including the following steps: Step 1: Prepare the components of the first premixed masterbatch: nylon 6, grey masterbatch, and anti-aging agent with a mass ratio of 88:9:3; Components of the second premixed masterbatch: nylon 6, red masterbatch, and anti-aging agent with a mass ratio of 88:9:3; Components of the premixed masterbatch III: Nylon 6, blue masterbatch, and anti-aging agent with a mass ratio of 88:9:3; The components in the premixed masterbatch I, the premixed masterbatch II, and the premixed masterbatch III were respectively stirred at 300 rpm for 5 min for blending, and then dried at 150 °C for 2 h until the moisture content of the material ≤ 0.08% to obtain three different premixed masterbatches; Step 2: The three premixed masterbatches were respectively melt-blended using three simultaneously set screw extruders. The processing temperature of the screw extruder was 240 - 265 °C, divided into four temperature zones, where the temperature of the first temperature zone was 240 °C, the temperature of the second temperature zone was 260 °C, the temperature of the third temperature zone was 265 °C, and the temperature of the fourth temperature zone was 265 °C. Then, they were respectively spun through a 50-hole trilobal spinneret. The spinning speed was 2800 m / min, the fineness of the single filament for spinning was 18 D. After spinning, they were air-cooled at 20 °C under 80% RH to obtain three different colored cooled fiber filaments; Step 3: The cooled fiber filaments were respectively oiled with an oiling rate of 0.95%. After oiling, they were jointly drawn at 160 °C with a draw ratio of 3.5. Then, they were further high-temperature expanded at 180 °C and 0.25 MPa, and then cooled and entered the spinning networker for network processing. The number of network knots for the network processing was 33. Finally, they were wound onto bobbins using a winder, and the winding speed of the winder was 2000 m / min to obtain a finished multi-colored composite fiber bundle.

[0046] Comparative Example 2 This comparative example provides a multi-colored composite fiber bundle, which is prepared by melting nylon 6, mixed color masterbatch, and anti-aging agent using a simultaneously set screw extruder followed by spinning and expansion processes; The breaking strength of the multi-colored composite fiber bundle is 2.05 cN / dtex, the elongation at break is 40.19%, and the oil content is 0.94%; The total crimp percentage of the multi-colored composite fiber bundle is 19.11%, the fineness is 2602 D, the number of holes is 150, and the coefficient of variation of the fineness of the single filament in the multi-colored composite fiber bundle is 2.34%.

[0047] This comparative example also provides a preparation method for the multi-colored composite fiber bundle, including the following steps: Step 1: Prepare the components of the premixed masterbatch I: Nylon 6, grey masterbatch, and anti-aging agent with a mass ratio of 88:9:3; Components of the premixed masterbatch II: Nylon 6, red masterbatch, and anti-aging agent with a mass ratio of 88:9:3; Components of the premixed masterbatch III: Nylon 6, blue masterbatch, and anti-aging agent with a mass ratio of 88:9:3; The components in the premixed masterbatch I, the premixed masterbatch II, and the premixed masterbatch III are respectively stirred at 300 rpm for 5 min and blended to obtain three different premixed masterbatches; Step 2: The three premixed masterbatches are respectively melt-blended by three synchronously set screw extruders. The processing temperature of the screw extruder is 240 - 265 °C, which is divided into four temperature zones. The temperature of the first temperature zone is 240 °C, the temperature of the second temperature zone is 260 °C, the temperature of the third temperature zone is 265 °C, and the temperature of the fourth temperature zone is 265 °C. Then, they are respectively spun through a 50-hole three-lobe spinneret. The spinning speed is 2800 m / min, and the single filament fineness of the spinning is 18 D. After spinning, they are air-cooled in an air-cooling device at 80% RH. The air-cooling device is divided into upper and lower layers. The temperature of the upper layer is 18 °C, and the wind speed is 0.1 m / s. The temperature of the lower layer is 25 °C, and the wind speed is 0.3 m / s. Three different colored cooled fiber filaments are obtained after air-cooling; Step 3: The cooled fiber filaments are respectively oiled with an oiling rate of 0.95%. After oiling, they are jointly drawn at 160 °C with a draw ratio of 3.5. They are continuously expanded at 180 °C and 0.25 MPa, and then cooled and enter a spinning networker for network processing. The number of network knots of the network processing is 33. Finally, they are wound and bobbinized with a winding machine. The winding speed of the winding machine is 2000 m / min to obtain a finished multi-color composite fiber bundle.

[0048] Comparative Example 3 This comparative example provides a multi-color composite fiber bundle, which is prepared by melting a nylon 6 mixed color masterbatch and an anti-aging agent by a synchronously set screw extruder and then through spinning and expansion processes; The breaking strength of the multi-color composite fiber bundle is 1.17 cN / dtex, the breaking elongation is 20.20%, and the oil content is 0.95%; The total crimp percentage of the multi-color composite fiber bundle is 20.08%, the fineness is 2623 D, the number of holes is 150, and the coefficient of variation of the fineness of the single filaments in the multi-color composite fiber bundle is 5.42%.

[0049] This comparative example also provides a preparation method of the multi-color composite fiber bundle, including the following steps: Step 1: Prepare the components of the premixed masterbatch I: nylon 6, a gray masterbatch, and an anti-aging agent with a mass ratio of 88:9:3; The components of the premixed masterbatch II: nylon 6, a red masterbatch, and an anti-aging agent with a mass ratio of 88:9:3; The components of the premixed masterbatch III: nylon 6, a blue masterbatch, and an anti-aging agent with a mass ratio of 88:9:3; The components in the pre-mixed masterbatch 1, the pre-mixed masterbatch 2, and the pre-mixed masterbatch 3 are respectively stirred at 300 rpm for 5 min for blending, and then dried at 150 °C for 2 h until the moisture content of the material ≤ 0.08% to obtain three different pre-mixed masterbatches; Step 2: The three pre-mixed masterbatches are respectively melt-blended by three simultaneously set screw extruders. The processing temperature of the screw extruder is 290 - 310 °C, which is divided into four temperature zones. The temperature of the first temperature zone is 290 °C, the temperature of the second temperature zone is 300 °C, the temperature of the third temperature zone is 310 °C, and the temperature of the fourth temperature zone is 300 °C. Then, they are respectively spun through a 50-hole trilobal spinneret. The spinning speed is 2800 m / min, and the fineness of the single filament for spinning is 18 D. After spinning, they are air-cooled in an air-cooling device at 80% RH. The air-cooling device is divided into upper and lower layers. The temperature of the upper layer is 18 °C, and the wind speed is 0.1 m / s. The temperature of the lower layer is 25 °C, and the wind speed is 0.3 m / s. Three different colored cooled fiber filaments are obtained after air-cooling; Step 3: The cooled fiber filaments are respectively oiled with an oiling rate of 0.95%. After oiling, they are jointly drawn at 160 °C with a draw ratio of 3.5. They are continuously high-temperature expanded at 180 °C and 0.25 MPa, and then cooled and enter a spinning networker for network processing. The number of network knots for the network processing is 33. Finally, they are wound onto a bobbin by a winding machine. The winding speed of the winding machine is 2000 m / min to obtain a finished multi-colored composite fiber bundle.

[0050] Table 1 shows the physical properties of the multi-colored composite fiber bundles in Examples 1 - 5 and Comparative Examples 1 - 3

[0051] Table 2 shows the color differences in the color space of the multi-colored composite fiber bundles in Examples 1 - 5

[0052] As shown in Table 1 and Table 2, the fiber bundle in the present invention has high mechanical strength, high color fastness, low coefficient of variation, and uniform color. In Comparative Example 1, since there is no gradient temperature setting during the air-cooling process, the crystallinity during fiber cooling is affected, resulting in an increase in the coefficient of variation of the fiber filaments. In Comparative Example 2, before melting, it is not dried, resulting in a relatively high moisture content of the materials in the pre-mixed masterbatch, and the comprehensive performance of the fiber filaments is low. Moreover, during the process of preparing carpets, burrs easily appear on the fiber filaments. In Comparative Example 3, the melting temperature of the fiber filaments is increased, which leads to a significant reduction in the mechanical properties of the fibers.

[0053] The test standard for the breaking strength of the multi-colored composite fiber bundle in the present invention is 《GB / T 14344 - 2008》, and a chemical fiber filament electronic strength tester is used for testing; The test standard for elongation at break is GB / T 14344-2008, and the test is conducted using an electronic strength tester for chemical fiber filaments. The test standard for oil content is GB / T 6504-2008, and the test is done using the nuclear magnetic resonance method. The test standard for total curl is the dynamic thermal curl tester used in the test of ASTM D6774-02; The test standard for coefficient of variation is GB / T 14343.

[0054] In the color fastness test of the automotive carpet described in the present invention, the color fastness rating ranges from 1 to 8, with 1 representing the worst color fastness and 8 representing the best color fastness; The illumination condition is irradiance: 1.10W / m 2 @420nm, black mark temperature: 62±3℃, chamber temperature: 65℃, relative humidity: 15%RH, test time: 216h, total irradiation: 840KJ / m 2 .

[0055] Based on the above, it can be seen that the multi-color composite fiber bundle of the present invention has a wide range of applications, low cost, and extremely high market prospects.

[0056] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent variation based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A multi-color composite fiber bundle, characterized in that, The multi-color composite fiber bundle is prepared by melting nylon 6, mixed color masterbatch and anti-aging agent by a synchronously set screw extruder, and then through spinning and bulking processes; The color difference in the color space of the multi-color composite fiber bundle is that the lightness color difference is 26.47, the red-green axis color difference is 2.43, and the yellow-blue axis color difference is 8.54; The breaking strength of the multi-color composite fiber bundle is 2.5 - 2.8 cN / dtex, the breaking elongation is 45 - 50%, and the oil content is 0.85 - 1%; The total crimp of the multi-color composite fiber bundle is 17 - 20%, the fineness is 2600 - 2650 D, the number of holes is 150 - 180, and the coefficient of variation of the fineness of the single filaments in the multi-color composite fiber bundle is 0.5 - 1.6%; The color difference of the multi-color composite fiber bundle after being irradiated by ultraviolet rays for 500 h is ≤1.

5.

2. The preparation method of the multi-color composite fiber bundle according to claim 1, characterized in that, It includes the following steps: Step 1: Stir and blend nylon 6, color masterbatch and anti-aging agent, and then dry to obtain a premixed masterbatch; Step 2: Melt and blend the premixed masterbatch respectively with synchronously set screw extruders, then spin through spinnerets respectively, and after spinning, conduct air cooling in an air cooling device. After air cooling, three different-color cooled fiber filaments are obtained; Step 3: Oil the cooled fiber filaments respectively, then conduct stretching together through stretching rollers, continue high-temperature bulking, then cool and enter a spinning networker for network processing, and finally wind and bobbin with a winding machine to obtain a finished multi-color composite fiber bundle.

3. The preparation method according to claim 2, wherein In the said Step 1, the number of the premixed masterbatch ≥3, and at this time, the types of colors of the color masterbatch ≥3, which is the same as the number of the premixed masterbatch.

4. The preparation method according to claim 2, characterized in that, In the said Step 1, the mass ratio of nylon 6, the color masterbatch and the anti-aging agent is (88 - 95):(4 - 9):(0.5 - 3).

5. The preparation method according to claim 2, characterized in that, In the said Step 1, the temperature of the drying is 100 - 150 °C, the time of the drying is 2 - 4 h, and the drying is until the water content in the material ≤0.08%.

6. The preparation method according to claim 2, characterized in that, In the said Step 2, the temperature of the screw extruder is 240 - 275 °C, which is divided into four temperature zones. Among them, the temperature of the first temperature zone is 240 - 250 °C, the temperature of the second temperature zone is 260 - 270 °C, the temperature of the third temperature zone is 265 - 275 °C, and the temperature of the fourth temperature zone is 260 - 270 °C.

7. The preparation method according to claim 2, characterized in that, In the said Step 2, the air cooling device is divided into upper and lower layers. Among them, the temperature of the upper layer is 15 - 18 °C, the wind speed is 0.1 - 0.3 m / s, the temperature of the lower layer is 20 - 25 °C, and the wind speed is 0.3 - 0.5 m / s.

8. The preparation method according to claim 2, characterized in that, In the said Step 3, the oiling rate of the oiling is 0.9 - 1%.

9. The preparation method according to claim 2, wherein In the said Step 3, the number of network knots of the network processing is 33 - 36.

10. An automotive carpet, characterized in that, The automotive carpet is prepared from the multi-color composite fiber bundles described in claim 1 as the pile layer material; the grammage of the multi-color composite fiber bundles in the automotive carpet is 300-400 g / m 2 , and the fluff retention of the automotive carpet is ≥90% after 50,000 times of friction; The color fastness of the automotive carpet is: dry rubbing color fastness ≥4 levels, wet rubbing color fastness ≥3.5 levels, and light fastness ≥7 levels.

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