Preparation method of high-gloss wool-like regenerated polyamide fiber

Abstract

The invention relates to the technical field of textile materials, in particular to a preparation method of a high-gloss wool-like regenerated polyamide fiber, which comprises the following steps: step 1, carrying out melt blending on regenerated polyamide slices through a double-screw extruder to obtain a melt; 2, the melt is conveyed to a triangular special-shaped spinneret plate in a spinning assembly through a metering pump, and melt trickles are extruded; 3, cooling and oiling the melt trickle, performing high-speed stretching and heat setting, and winding to obtain a high-gloss regenerated chinlon FDY filament; 4, the high-gloss regenerated chinlon FDY filaments serve as core yarn and skin yarn, and the high-gloss wool-like regenerated chinlon fibers are prepared through an air texturing technology. The fiber provided by the invention not only has wool-like soft texture, but also has excellent glossiness and environmental protection performance.

Description

Technical Field

[0001] The invention relates to the technical field of textile materials, in particular to a method for preparing high-gloss wool-like regenerated nylon fiber. Background Art

[0002] Nylon fiber is widely used in the textile industry due to its excellent strength, abrasion resistance, and elasticity. However, the production of traditional nylon fiber relies on petroleum-based raw materials, which not only consumes a lot of resources but also places significant pressure on the environment. With growing environmental awareness, recycled nylon fiber has gradually become a research hotspot. Recycled nylon fiber is made by recycling used nylon products or industrial waste and re-fibering it through chemical or physical methods, offering significant environmental advantages.

[0003] Wool-like fibers are widely used in clothing, home textiles, and other fields due to their softness, fluffiness, and warmth. However, existing wool-like fibers often lack gloss, failing to meet the high-gloss requirements of high-end textiles. Therefore, developing a regenerated nylon fiber that combines wool-like texture with high gloss and environmental performance is of great significance. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for preparing high-gloss wool-like regenerated nylon fiber, which not only has the soft texture of wool-like but also has excellent glossiness and environmental protection performance.

[0005] The technical solution of the present invention:

[0006] A method for preparing high-gloss wool-like regenerated nylon fiber comprises the following steps:

[0007] Step 1: melt-blending the recycled nylon chips through a twin-screw extruder to obtain a melt;

[0008] Step 2: The melt is transported to the triangular shaped spinneret in the spinning assembly through a metering pump to extrude a thin stream of melt;

[0009] Step 3: The melt stream is cooled, oiled, stretched and heat-set at high speed, and then wound to obtain high-gloss recycled nylon FDY filament;

[0010] Step 4: Using high-gloss regenerated nylon FDY filament as core yarn and sheath yarn, high-gloss wool-like regenerated nylon fiber is prepared through air deformation process.

[0011] Furthermore, in step 4, the air deformation process is to bend the monofilament to form a loop structure under air jet.

[0012] Furthermore, in step 1, the regenerated nylon slices are derived from recycled polyamide from waste nylon products, and glossy slices are selected.

[0013] Further, in step 1, the melting temperature of the twin-screw extruder is 245 - 265 °C.

[0014] Further, in step 2, the metering pump frequency is 20 - 60 Hz, and the specification of the triangular-shaped spinneret plate in the spinning pack is 77 - 12Y * 0.7C;

[0015] Further, in step 3, the cooling air speed in the cooling and oiling process is 0.3 - 0.5 m / s, and the mass fraction of the oil agent is 5% - 7%; the drawing ratio of the high-speed drawing and heat setting is 1.1 - 4.0 times, the heat setting temperature is 150 - 180 °C, and the spinning speed is 4000 - 4800 m / min.

[0016] Further, in step 4, the difference in the overfeed ratio between the skin yarn and the core yarn passing through the transmission roller is 8 - 13%, the moisture content of the core yarn is 0.8 - 1.2 L / h, the air pressure is 10 - 11.5 bar, and the texturing speed is 300 - 450 m / min.

[0017] Advantages of the present invention:

[0018] The present invention uses recycled chips derived from waste polyamide products as raw materials, achieving the recycling of resources, significantly reducing the dependence on petroleum-based raw materials, effectively reducing environmental pollution, and meeting the requirements of green and sustainable development. By using a triangular-shaped spinneret plate and combining with the air texturing process, without adding any gloss enhancer and wool-like modifier, the fiber naturally has a super-bright appearance effect, and at the same time endows it with a soft and fluffy wool-like texture. In addition, the fiber also has good elasticity and warmth retention performance, and can meet the multiple requirements of high-end textiles for gloss, comfort and functionality. Description of the drawings

[0019] Figure 1 is a flow chart of the preparation method of the present invention.

[0020] Figure 2 is a cross-sectional view of the fiber in Example 1.

[0021] Figure 3 is a cross-sectional view of the fiber in Example 2. Detailed implementation manners

[0022] The present invention will be further described below with reference to the drawings.

[0023] As Figure 1 shown, the present invention provides a preparation method of high-gloss wool-like recycled polyamide fiber, including the following steps:

[0024] Step 1: Melting and blending the recycled polyamide chips through a twin-screw extruder to obtain a melt;

[0025] Step 2: The melt is transported to a triangular-shaped spinneret plate in the spinning pack through a metering pump, and a thin melt stream is extruded.

[0026] Step 3: The thin melt stream undergoes cooling and oiling, high-speed stretching and heat setting, and is wound to obtain high-luster recycled polyamide FDY filaments.

[0027] Step 4: Using the high-luster recycled polyamide FDY filaments as the core yarn and the sheath yarn, a high-luster wool-like recycled polyamide fiber is prepared through an air texturing process.

[0028] In the said Step 4, the air texturing process means that the monofilaments are bent to form a looped structure under air injection.

[0029] In the said Step 1, the recycled polyamide chips are recycled polyamides from waste polyamide products, and bright (BR) chips are selected.

[0030] In the said Step 1, the melting temperature of the twin-screw extruder is 245 - 265 °C.

[0031] In the said Step 2, the metering pump frequency is 20 - 60 Hz, and the specification of the triangular-shaped spinneret plate in the spinning pack is 77 - 12Y * 0.7C.

[0032] In the said Step 3, the cooling air speed in the cooling and oiling is 0.3 - 0.5 m / s, and the mass fraction of the oil agent is 5% - 7%; the stretching ratio of the high-speed stretching and heat setting is 1.1 - 4.0 times, the heat setting temperature is 150 - 180 °C, and the spinning speed is 4000 - 4800 m / min.

[0033] In the said Step 4, the difference in the overfeed ratio between the sheath yarn and the core yarn passing through the transmission rollers is 8 - 13%, the moisture content of the core yarn is 0.8 - 1.2 L / h, the air pressure is 10 - 11.5 bar, and the texturing speed is 300 - 450 m / min.

[0034] The following further illustrates the present invention with specific embodiments:

[0035] Embodiment 1

[0036] As Figure 2 shown, (1) The bright (BR) recycled polyamide chips are melt-blended through a twin-screw extruder, and the melting temperatures are 250 °C, 253 °C, 254 °C, 256 °C, and 259 °C respectively.

[0037] (2) The melt is transported to a triangular-shaped spinneret plate in the spinning pack with a metering pump frequency of 19.8 Hz. The specification of the spinneret plate is 77 - 12Y * 0.7C, the cooling air speed is 0.4 m / s, and the mass fraction of the oil agent is 7%.

[0038] (3) The oiled tow is subjected to high-speed drawing and heat setting. The drawing ratio is 1.19 times, the heat setting temperature is 160 °C, the spinning speed is 4800 m / min, and 20D / 12F BR high-luster regenerated polyamide FDY filaments are obtained by winding. The breaking strength is 4.8 cN / dtex, and the breaking elongation is 42.08%;

[0039] (4) Using the 20D / 12F BR high-luster regenerated polyamide FDY filaments as the core yarn and the sheath yarn, the overfeed ratio value of the sheath yarn passing through the transmission roller is 20%, the overfeed ratio value of the core yarn passing through the transmission roller is 11%, the moisture supply of the core yarn is 0.9 L / h, the air pressure is 10.56 bar, and the texturing speed is 350 m / min to prepare 45D / 24F BR high-luster wool-like regenerated polyamide fibers.

[0040] Example 2

[0041] As Figure 3 shown, (1) The bright (BR) regenerated polyamide chips are melt-blended by a twin-screw extruder, and the melting temperatures are 255 °C, 257 °C, 258 °C, 259 °C, and 259 °C respectively;

[0042] (2) The melt is delivered to a triangular-shaped spinneret plate in the spinning pack by a metering pump with a frequency of 34 Hz. The spinneret plate specification is 77-12Y*0.7C, the cooling air speed is 0.43 m / s, and the mass fraction of the oil agent is 7%;

[0043] (3) The oiled tow is subjected to high-speed drawing and heat setting. The drawing ratio is 1.16 times, the heat setting temperature is 155 °C, the spinning speed is 4500 m / min, and 30D / 12F BR high-luster regenerated polyamide FDY filaments are obtained by winding. The breaking strength is 4.91 cN / dtex, and the breaking elongation is 41.51%;

[0044] (4) Using the high-luster regenerated polyamide FDY filaments of the same specification as the core yarn and the sheath yarn, the overfeed ratio value of the sheath yarn passing through the transmission roller is 25%, the overfeed ratio value of the core yarn passing through the transmission roller is 13%, the moisture supply of the core yarn is 1.00 L / h, the air pressure is 10.50 bar, and the texturing speed is 400 m / min to prepare 68D / 24F BR high-luster wool-like regenerated polyamide fibers.

[0045] The above are only the preferred embodiments of the present invention and should not be construed as limitations to this application. Any equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims

1. A preparation method of high-gloss wool-like regenerated polyamide fiber, characterized in that, The following steps are involved: Step 1: melt-blending the recycled nylon chips through a twin-screw extruder to obtain a melt; Step 2: The melt is transported to the triangular shaped spinneret in the spinning assembly through a metering pump to extrude a thin stream of melt; Step 3: The melt stream is cooled, oiled, stretched and heat-set at high speed, and then wound to obtain high-gloss recycled nylon FDY filament; Step 4: Using high-gloss regenerated nylon FDY filament as core yarn and sheath yarn, high-gloss wool-like regenerated nylon fiber is prepared through air deformation process.

2. The preparation method of a high-gloss wool-like regenerated polyamide fiber according to claim 1, characterized in that, In step 4, the air deformation process is to bend the monofilament into a loop structure under air jet.

3. The preparation method of a high-gloss wool-like regenerated polyamide fiber according to claim 1, characterized in that, In the step 1, the regenerated nylon slices are derived from recycled polyamide from waste nylon products, and the glossy slices are selected.

4. The preparation method of a high-gloss wool-like regenerated polyamide fiber according to claim 1, characterized in that, In the step 1, the melting temperature of the twin-screw extruder is 245-265°C.

5. The preparation method of a high-gloss wool-like regenerated polyamide fiber according to claim 2, characterized in that, In the step 2, the frequency of the metering pump is 20-60 Hz, and the specification of the triangular special-shaped spinneret in the spinning assembly is 77-12Y*0.7C.

6. The preparation method of a high-gloss wool-like regenerated polyamide fiber according to claim 1, characterized in that, In step 3, the cooling wind speed in the cooling and oiling is 0.3-0.5 m / s, and the mass fraction of the oil agent is 5%-7%; the stretching ratio of high-speed stretching and heat setting is 1.1-4.0 times, the heat setting temperature is 150-180° C., and the spinning speed is 4000-4800 m / min.

7. The preparation method of a high-gloss wool-like regenerated polyamide fiber according to claim 1, characterized in that, In step 4, the difference in overfeed rate between the sheath yarn and the core yarn passing through the transmission roller is 8-13%, the core yarn moisture supply is 0.8-1.2 L / h, the air pressure is 10-11.5 bar, and the deformation speed is 300-450 m / min.

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