Polyester imitated silk crepe fabric and preparation method thereof

Abstract

The invention provides a polyester imitated silk crepe fabric and a preparation method thereof. The method comprises the following steps: S1, blending conventional polyester chips, maleic anhydride grafted polyester chips, high-shrinkage polyester chips, TEMPO oxidized nano cellulose and a heat stabilizer, and granulating; s2, performing melt spinning on the material obtained in the step S1 to obtain composite fibers, performing multi-stage stretching and gradient heat setting on the composite fibers, and then performing drafting and twisting to obtain composite yarns; s3, weaving the yarns obtained in the S2 to obtain a fabric, so as to obtain the polyester imitated silk crepe fabric.

Description

Technical Field

[0001] The present invention relates to the field of textile fabrics, and particularly to a polyester silk-like crepe fabric and a preparation method thereof. Background Art

[0002] As a natural protein fiber, silk has become a popular raw material in the field of textile fabrics due to its high moisture absorption rate, high air permeability, antistatic property, warm in winter and cool in summer, etc. However, the strength and durability of natural silk are poor, and it is easy to fuzz and snag during long-term use; in addition, the chemical stability of natural silk is poor, and it will hydrolyze and break in an environment with pH < 3 or > 9, and the strength retention rate is only 50 - 60% under ultraviolet irradiation. Therefore, the development of durable and chemically stable silk-like fabrics has become a research hotspot. Polyester silk-like crepe fabric is an important achievement in the chemical fiber field to imitate natural silk crepe fabrics through structural design and process innovation. Its development background can be traced back to the 1960s. At that time, polyester fibers were used for silk-like fabrics due to their high strength and low cost, etc. However, the early products could only imitate the appearance of real silk, and there were significant gaps in luster, hand feeling and functionality. With the progress of technology, polyester silk-like has gone through five development stages: from the development of profiled cross-section fibers, fine denier to superfine denier composite technology, gradually approaching the multi-level structural characteristics of real silk. Especially in the field of crepe fabrics, through strong twisting, false twisting processes and alkali weight reduction treatment, polyester can imitate the silk feeling, drapability and wrinkle resistance of real silk crepe fabrics. However, the traditional process relies on the alkali weight reduction method, which not only consumes fibers but also pollutes the environment. At the same time, the multi-layer composite structure results in high cost and complex process. Summary of the Invention

[0003] Technical problems to be solved: In the present invention, the preparation of polyester silk-like crepe fabric is achieved through the differential shrinkage mechanism of adding TEMPO-oxidized nanofibrillated cellulose, high shrinkage polyester chips and conventional polyester chips, and the free shrinkage control of gradient heat setting.

[0004] Technical Solution: A polyester silk-like crepe fabric and a preparation method thereof, characterized in that: the preparation method comprises the following steps: S1. Mix and granulate conventional polyester chips, maleic anhydride-grafted polyester chips, high shrinkage polyester chips, TEMPO-oxidized nanofibrillated cellulose and heat stabilizer; S2. Melt-spin the material obtained in S1 to obtain composite fibers, perform multi-stage stretching and gradient heat setting on the composite fibers, and then obtain composite yarns through drawing and twisting; S3. Weave the yarn obtained in S2 to obtain a fabric, and obtain a polyester silk-like crepe fabric. Preferably, in S1, the diameter of the TEMPO-oxidized nanocellulose is 3 - 5 nm, and the aspect ratio is 100 - 200. The mass ratio of the conventional polyester chip, maleic anhydride-grafted polyester chip, high-shrinkage polyester chip, TEMPO-oxidized nanocellulose, and heat stabilizer is 70 - 75:15 - 20:3 - 5:5 - 10:0.2 - 0.5. The shrinkage rate of the high-shrinkage polyester chip is 30 - 40%, and the heat stabilizer is tris(2-ethylhexyl) phosphite. Preferably, the preparation method of the maleic anhydride-grafted polyester chip in S1 comprises the following steps: S11. Mix maleic anhydride, polyester chip, and dicumyl peroxide in a mass ratio of 100:(1 - 5):(0.3 - 1.0), and carry out a melting reaction at 240 - 270°C for 2 - 10 min under nitrogen protection; S12. Extract the product obtained in S11 with an acetone or xylene solvent for 24 - 48 h, and then vacuum dry to obtain the maleic anhydride-grafted polyester chip. Preferably, in S2, the temperature of the first-stage drawing in the multi-stage drawing is 70 - 90°C, and the draw ratio is 1.5 - 2.0. The temperature of the second-stage drawing in the multi-stage drawing is 100 - 120°C, and the draw ratio is 1.2 - 1.5. Preferably, in the gradient heat setting in S2, the temperature in the high-temperature zone is 180 - 200°C, the tension is 0.5 - 1 MPa, and the residence time is 10 - 30 s; the temperature in the medium-temperature zone in the gradient heat setting is 120 - 150°C, with zero-tension free shrinkage, and the residence time is 20 - 40 s; the temperature in the low-temperature zone in the gradient heat setting is 80 - 100°C, the tension is 0.1 - 0.3 MPa, and the residence time is 50 - 70 s. Preferably, the temperature of the melt spinning in S2 is 170 - 225°C. Preferably, the draw ratio in S2 is 2 - 4, and the twist coefficient is 300 - 500 T / m. Preferably, in S3, the warp density of the fabric is 290 - 350 threads / 10 cm, and the weft density is 110 - 130 threads / 10 cm. Beneficial effects: The present invention has the following advantages: 1. In the present invention, the negatively charged surface of the TEMPO-oxidized nanocellulose with a high aspect ratio achieves single-fiber dispersion through electrostatic repulsion, forming an independent structure similar to silk nanofibrils. Moreover, the TEMPO-oxidized nanofibers retain the high crystallinity of cellulose, which is similar to the high crystallinity of the β-sheet crystal regions in silk. By combining the TEMPO-oxidized nanocellulose with a high aspect ratio with the PET matrix, the carboxylic acid groups (-COOH) on the surface of the TEMPO-oxidized nanocellulose can bind to the ester groups (-COO-) of PET through hydrogen bonds or electrostatic interactions, forming an interfacial crosslinking similar to the hydrogen bonds between β-sheet crystals in silk. In addition, the high aspect ratio of the TEMPO-oxidized nanocellulose enables it to form a three-dimensional network structure in the PET matrix, enhancing the interfacial bonding through physical entanglement and nano-scale interlocking. This structure is similar to the overlapping and entanglement of nanofibrils in silk, thus achieving the purpose of imitating silk. 2. In the present invention, maleic anhydride-grafted polyester chips are introduced as an interfacial compatibilizer to solve the interfacial incompatibility problem between PET (hydrophobic) and nanocellulose (hydrophilic) through chemical bonding between the anhydride groups and the carboxyl groups of the TEMPO-oxidized nanocellulose. 3. In the present invention, a process combining multi-stage stretching and gradient heat setting is adopted to form wrinkles: in the first stage of multi-stage stretching, the molecular chains of the high-shrinkage polyester chips are forcibly stretched, storing more elastic potential energy; in the second stage of multi-stage stretching, the high-shrinkage polyester chips release elastic potential energy due to the retraction of the molecular chains, while the conventional polyester chips have a low shrinkage rate. The shrinkage difference between the two causes local bending of the fibers, forming natural wrinkles. In gradient heat setting, stretching and heat setting are carried out simultaneously in the high-temperature zone to eliminate internal stress and fix the molecular chain orientation. In the medium-temperature zone, differential shrinkage under zero tension triggers wrinkles, and in the low-temperature zone, tension stretching inhibits rebound, locking the wrinkle morphology. In addition, the collaborative design of multi-stage stretching and gradient heat setting reduces the dependence on chemical crosslinking, conforming to the current environmental protection development trend in the textile industry. Detailed implementation mode The present invention will be further described below in conjunction with embodiments. The following embodiments are explanations of the present invention, and the present invention is not limited to the following embodiments: Example 1 A polyester silk-like crepe fabric and its preparation method, the preparation method comprising the following steps: S1. Mix and granulate conventional polyester chips, maleic anhydride-grafted polyester chips, high-shrinkage polyester chips, TEMPO-oxidized nanocellulose, and triisooctyl phosphite with a mass ratio of 70:15:3:5:0.2. The diameter of the TEMPO-oxidized nanocellulose is 3 nm, the aspect ratio is 100, and the shrinkage rate of the high-shrinkage polyester chips is 30%. S2. The material obtained in S1 is melt-spun at 170 °C to obtain composite fibers. The composite fibers are subjected to multi-stage stretching and gradient heat setting, and then drawn (drawing ratio is 2) and twisted (twist coefficient is 300 T / m) to obtain composite yarns. Among them, the temperature of the first-stage drawing in the multi-stage stretching is 70 °C, the drawing ratio is 1.5, the temperature of the second-stage drawing in the multi-stage stretching is 100 °C, the drawing ratio is 1.2, the temperature in the high-temperature zone of the gradient heat setting is 180 °C, the tension is 0.5 MPa, and the residence time is 10 s; the temperature in the medium-temperature zone of the gradient heat setting is 120 °C, with zero-tension free shrinkage, and the residence time is 20 s; the temperature in the low-temperature zone of the gradient heat setting is 80 °C, the tension is 0.1 MPa, and the residence time is 50 s; S3. The yarn obtained in S2 is woven to obtain a fabric, and a polyester silk-like crepe fabric with a warp density of 290 threads / 10 cm and a weft density of 110 threads / 10 cm is obtained. Among them, the preparation method of the maleic anhydride-grafted polyester chip in S1 includes the following steps: S11. Mix maleic anhydride, polyester chip and diisopropylbenzene peroxide according to a mass ratio of 100:1:0.3, and carry out a melting reaction at 240 °C for 2 min under nitrogen protection; S12. The product obtained in S11 is extracted with acetone solvent for 24 h, and then vacuum dried to obtain maleic anhydride-grafted polyester chips. Example 2 A polyester silk-like crepe fabric and a preparation method thereof, the preparation method includes the following steps: S1. Mix regular polyester chips, maleic anhydride-grafted polyester chips, high-shrinkage polyester chips, TEMPO-oxidized nanocellulose and tris(2-ethylhexyl) phosphite in a mass ratio of 75:20:5:10:0.5 and granulate them. Among them, the diameter of the TEMPO-oxidized nanocellulose is 5 nm, the aspect ratio is 200, and the shrinkage rate of the high-shrinkage polyester chips is 40%; S2. The material obtained in S1 is melt-spun at 225 °C to obtain composite fibers. The composite fibers are subjected to multi-stage stretching and gradient heat setting, and then drawn (drawing ratio is 4) and twisted (twist coefficient is 500 T / m) to obtain composite yarns. Among them, the temperature of the first-stage drawing in the multi-stage stretching is 90 °C, the drawing ratio is 2.0, the temperature of the second-stage drawing in the multi-stage stretching is 120 °C, the drawing ratio is 1.5, the temperature in the high-temperature zone of the gradient heat setting is 200 °C, the tension is 1 MPa, and the residence time is 30 s; the temperature in the medium-temperature zone of the gradient heat setting is 150 °C, with zero-tension free shrinkage, and the residence time is 40 s; the temperature in the low-temperature zone of the gradient heat setting is 100 °C, the tension is 0.3 MPa, and the residence time is 70 s; S3. The yarn obtained in S2 is woven to obtain a fabric, and a polyester silk-like crepe fabric with a warp density of 350 threads / 10 cm and a weft density of 130 threads / 10 cm is obtained. Among them, the preparation method of the maleic anhydride grafted polyester chip in S1 includes the following steps: S11. Mix maleic anhydride, polyester chip and diisopropylbenzene peroxide in a mass ratio of 100:5:1.0, and carry out a melting reaction at 270 °C for 10 min under nitrogen protection; S12. Extract the product obtained in S11 with xylene solvent for 48 h, and then vacuum dry to obtain the maleic anhydride grafted polyester chip. Example 3 A polyester simulated silk crepe fabric and its preparation method, the preparation method includes the following steps: S1. Blend and pelletize conventional polyester chip, maleic anhydride grafted polyester chip, high shrinkage polyester chip, TEMPO oxidized nanocellulose and tris(2-ethylhexyl) phosphite with a mass ratio of 75:15:3:5:0.3, wherein the diameter of the TEMPO oxidized nanocellulose is 4 nm, the aspect ratio is 150, and the shrinkage rate of the high shrinkage polyester chip is 35%; S2. Melt-spin the material obtained in S1 at 180 °C to obtain composite fibers, perform multi-stage stretching and gradient heat setting on the composite fibers, and then obtain composite yarns through drawing (drawing ratio is 3) and twisting (twisting coefficient is 350 T / m). Among them, the temperature of the first-stage drawing in the multi-stage stretching is 75 °C, the drawing ratio is 1.8, the temperature of the second-stage drawing in the multi-stage stretching is 105 °C, the drawing ratio is 1.3, the temperature of the high-temperature zone in the gradient heat setting is 190 °C, the tension is 1 MPa, and the residence time is 15 s; the temperature of the medium-temperature zone in the gradient heat setting is 130 °C, with zero-tension free shrinkage and a residence time of 30 s; the temperature of the low-temperature zone in the gradient heat setting is 90 °C, the tension is 0.2 MPa, and the residence time is 55 s; S3. Weave the yarn obtained in S2 to obtain a fabric, and obtain a polyester simulated silk crepe fabric with a warp density of 340 ends / 10 cm and a weft density of 120 ends / 10 cm. Among them, the preparation method of the maleic anhydride grafted polyester chip in S1 includes the following steps: S11. Mix maleic anhydride, polyester chip and diisopropylbenzene peroxide in a mass ratio of 100:3:0.8, and carry out a melting reaction at 250 °C for 6 min under nitrogen protection; S12. Extract the product obtained in S11 with acetone solvent for 40 h, and then vacuum dry to obtain the maleic anhydride grafted polyester chip. Example 4 A polyester simulated silk crepe fabric and its preparation method, the preparation method includes the following steps: S1. Blend and pelletize regular polyester chips, maleic anhydride-grafted polyester chips, high-shrinkage polyester chips, TEMPO-oxidized nanocellulose, and triisooctyl phosphite with a mass ratio of 73:18:4:8:0.4. The diameter of the TEMPO-oxidized nanocellulose is 4 nm, the aspect ratio is 150, and the shrinkage rate of the high-shrinkage polyester chips is 30%; S2. Melt-spin the material obtained in S1 at 190 °C to obtain composite fibers. Perform multi-stage stretching and gradient heat setting on the composite fibers, and then obtain composite yarns through drawing (drawing ratio is 3) and twisting (twisting coefficient is 400 T / m). Among them, the temperature of the first-stage drawing in the multi-stage stretching is 80 °C, the drawing ratio is 1.8, the temperature of the second-stage drawing in the multi-stage stretching is 110 °C, the drawing ratio is 1.4, the temperature in the high-temperature zone during gradient heat setting is 190 °C, the tension is 0.8 MPa, and the residence time is 15 s; the temperature in the medium-temperature zone during the gradient heat setting is 140 °C, free shrinkage with zero tension, and the residence time is 25 s; the temperature in the low-temperature zone during the gradient heat setting is 90 °C, the tension is 0.2 MPa, and the residence time is 65 s; S3. Weave the yarn obtained in S2 to obtain a fabric, and obtain a polyester silk-like crepe fabric with a warp density of 300 ends / 10 cm and a weft density of 110 ends / 10 cm. Among them, the preparation method of the maleic anhydride-grafted polyester chips in S1 includes the following steps: S11. Mix maleic anhydride, polyester chips, and diisopropylbenzene peroxide in a mass ratio of 100:1:0.8, and carry out a melting reaction at 240 °C for 5 min under nitrogen protection; S12. Extract the product obtained in S11 with acetone solvent for 28 h, and then vacuum dry to obtain maleic anhydride-grafted polyester chips. Example 5 A polyester silk-like crepe fabric and its preparation method, the preparation method includes the following steps: S1. Blend and pelletize regular polyester chips, maleic anhydride-grafted polyester chips, high-shrinkage polyester chips, TEMPO-oxidized nanocellulose, and triisooctyl phosphite with a mass ratio of 70:15:4:8:0.4. The diameter of the TEMPO-oxidized nanocellulose is 3 nm, the aspect ratio is 180, and the shrinkage rate of the high-shrinkage polyester chips is 38%; S2. Melt-spin the material obtained in S1 at 170 °C to obtain composite fibers. Perform multi-stage stretching and gradient heat setting on the composite fibers, and then obtain composite yarns through drawing (drawing ratio is 3) and twisting (twisting coefficient is 380 T / m). Among them, the temperature of the first-stage drawing in the multi-stage stretching is 80 °C, the drawing ratio is 1.8, the temperature of the second-stage drawing in the multi-stage stretching is 110 °C, the drawing ratio is 1.4, the temperature in the high-temperature zone during gradient heat setting is 190 °C, the tension is 0.8 MPa, and the residence time is 15 s; the temperature in the medium-temperature zone during the gradient heat setting is 120 °C, with zero-tension free shrinkage and a residence time of 30 s; the temperature in the low-temperature zone during the gradient heat setting is 90 °C, the tension is 0.2 MPa, and the residence time is 55 s; S3. Weave the yarn obtained in S2 to obtain a fabric, and obtain a polyester silk-like crepe fabric with a warp density of 320 ends / 10 cm and a weft density of 120 ends / 10 cm. Among them, the preparation method of the maleic anhydride-grafted polyester chip in S1 includes the following steps: S11. Mix maleic anhydride, polyester chip, and diisopropylbenzene peroxide according to a mass ratio of 100:4:0.5, and carry out a melting reaction at 240 °C for 6 min under nitrogen protection; S12. Extract the product obtained in S11 with acetone solvent for 30 h, and then vacuum dry to obtain maleic anhydride-grafted polyester chips. Example 6 A polyester silk-like crepe fabric and its preparation method, the preparation method includes the following steps: S1. Blend and granulate conventional polyester chips, maleic anhydride-grafted polyester chips, high-shrinkage polyester chips, TEMPO-oxidized nanofibrillated cellulose, and tris(2-ethylhexyl) phosphite with a mass ratio of 72:20:3:8:0.4. Among them, the diameter of the TEMPO-oxidized nanofibrillated cellulose is 4 nm, the aspect ratio is 120, and the shrinkage rate of the high-shrinkage polyester chip is 35%; S2. Melt-spin the material obtained in S1 at 200 °C to obtain composite fibers. Perform multi-stage stretching and gradient heat setting on the composite fibers, and then obtain composite yarns through drawing (drawing ratio is 4) and twisting (twisting coefficient is 500 T / m). Among them, the temperature of the first-stage drawing in the multi-stage stretching is 80 °C, the drawing ratio is 1.8, the temperature of the second-stage drawing in the multi-stage stretching is 110 °C, the drawing ratio is 1.4, the temperature in the high-temperature zone during gradient heat setting is 190 °C, the tension is 0.8 MPa, and the residence time is 15 s; the temperature in the medium-temperature zone during the gradient heat setting is 140 °C, with zero-tension free shrinkage and a residence time of 35 s; the temperature in the low-temperature zone during the gradient heat setting is 90 °C, the tension is 0.2 MPa, and the residence time is 65 s; S3. Weave the yarn obtained in S2 to obtain a fabric, and obtain a polyester silk-like crepe fabric with a warp density of 300 ends / 10 cm and a weft density of 120 ends / 10 cm. Among them, the preparation method of the maleic anhydride grafted polyester chips in S1 comprises the following steps: S11. Mix maleic anhydride, polyester chips and diisopropylbenzene peroxide in a mass ratio of 100:4:0.6, and carry out a melting reaction at 260 °C for 8 min under nitrogen protection; S12. Extract the product obtained in S11 with acetone or xylene solvent for 30 h, and then vacuum dry to obtain maleic anhydride grafted polyester chips. Example 7 A polyester simulated silk crepe fabric and its preparation method, the preparation method comprises the following steps: S1. Blend and granulate conventional polyester chips, maleic anhydride grafted polyester chips, high shrinkage polyester chips, TEMPO oxidized nanocellulose and tris(iso-octyl) phosphite in a mass ratio of 72:18:4:9:0.4, wherein the diameter of the TEMPO oxidized nanocellulose is 4 nm, the aspect ratio is 180, and the shrinkage rate of the high shrinkage polyester chips is 35%; S2. Melt-spin the material obtained in S1 at 190 °C to obtain composite fibers, perform multi-stage stretching and gradient heat setting on the composite fibers, and then obtain composite yarns through drawing (drawing ratio is 2) and twisting (twisting coefficient is 450 T / m). Among them, the temperature of the first-stage drawing in the multi-stage stretching is 80 °C, the drawing ratio is 1.8, the temperature of the second-stage drawing in the multi-stage stretching is 110 °C, the drawing ratio is 1.4, the temperature in the high-temperature zone during gradient heat setting is 190 °C, the tension is 0.8 MPa, and the residence time is 15 s; the temperature in the medium-temperature zone during the gradient heat setting is 140 °C, free shrinkage with zero tension, and the residence time is 30 s; the temperature in the low-temperature zone during the gradient heat setting is 90 °C, the tension is 0.2 MPa, and the residence time is 60 s; S3. Weave the yarn obtained in S2 to obtain a fabric, and obtain a polyester simulated silk crepe fabric with a warp density of 340 ends / 10 cm and a weft density of 120 ends / 10 cm. Among them, the preparation method of the maleic anhydride grafted polyester chips in S1 comprises the following steps: S11. Mix maleic anhydride, polyester chips and diisopropylbenzene peroxide in a mass ratio of 100:3:0.8, and carry out a melting reaction at 250 °C for 6 min under nitrogen protection; S12. Extract the product obtained in S11 with acetone solvent for 35 h, and then vacuum dry to obtain maleic anhydride grafted polyester chips. Example 8 A polyester simulated silk crepe fabric and its preparation method, the preparation method comprises the following steps: S1. Blend and pelletize regular polyester chips, maleic anhydride-grafted polyester chips, high-shrinkage polyester chips, TEMPO-oxidized nanocellulose, and tris(2-ethylhexyl) phosphite with a mass ratio of 70:18:4:8:0.4. The diameter of the TEMPO-oxidized nanocellulose is 3 nm, the aspect ratio is 165, and the shrinkage rate of the high-shrinkage polyester chips is 38%; S2. Melt-spin the material obtained in S1 at 190 °C to obtain composite fibers. Perform multi-stage stretching and gradient heat setting on the composite fibers, and then obtain composite yarns through drawing (drawing ratio is 3) and twisting (twisting coefficient is 450 T / m). Among them, the temperature of the first-stage drawing in the multi-stage stretching is 80 °C, the drawing ratio is 1.8, the temperature of the second-stage drawing in the multi-stage stretching is 110 °C, the drawing ratio is 1.4, the temperature in the high-temperature zone during gradient heat setting is 190 °C, the tension is 0.8 MPa, and the residence time is 15 s; the temperature in the medium-temperature zone during the gradient heat setting is 145 °C, with zero-tension free shrinkage and a residence time of 25 s; the temperature in the low-temperature zone during the gradient heat setting is 90 °C, the tension is 0.2 MPa, and the residence time is 65 s; S3. Weave the yarn obtained in S2 to obtain a fabric, and obtain a polyester silk-like crepe fabric with a warp density of 330 per 10 cm and a weft density of 120 per 10 cm. Among them, the preparation method of the maleic anhydride-grafted polyester chips in S1 includes the following steps: S11. Mix maleic anhydride, polyester chips, and diisopropylbenzene peroxide in a mass ratio of 100:3:0.9, and carry out a melting reaction at 260 °C for 9 min under nitrogen protection; S12. Extract the product obtained in S11 with acetone solvent for 35 h, and then vacuum dry to obtain maleic anhydride-grafted polyester chips. Comparative Example 1 The difference between this comparative example and Example 8 is that no maleic anhydride-grafted polyester chips are added in S1. Comparative Example 2 The difference between this comparative example and Example 8 is that no high-shrinkage polyester chips are added in S1 Comparative Example 3 The difference between this comparative example and Example 8 is that no TEMPO-oxidized nanocellulose is added in S1. Comparative Example 4 The difference between this comparative example and Example 8 is that the aspect ratio of the TEMPO-oxidized nanocellulose in S1 is 50. Comparative Example 5 The difference between this comparative example and Example 8 is that the shrinkage rate of the high-shrinkage polyester chips in S1 is 10%. Comparative Example 6 The difference between this comparative example and Example 8 is that in S2, only multi-stage drawing is performed without gradient heat setting. Comparative Example 7 The difference between this comparative example and Example 8 is that in S2, only gradient heat setting is performed without multi-stage drawing. Performance test The fabrics obtained in Examples 1 to 8 and Comparative Examples 1 to 7 were subjected to performance tests, and the results are shown in the following table. Obviously, the above examples are only for illustration purposes and are not intended to limit the implementation. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A polyester imitation silk crepe fabric and its preparation method, characterized in that: The preparation method comprises the following steps: S1. Blending and pelletizing conventional polyester chips, maleic anhydride-grafted polyester chips, high-shrinkage polyester chips, TEMPO-oxidized nanocellulose, and a heat stabilizer; S2. Melt-spinning the material obtained in S1 to obtain composite fibers, subjecting the composite fibers to multi-stage drawing and gradient heat setting, and then obtaining composite yarns through drawing and twisting; S3. Weaving the yarns obtained in S2 to obtain a fabric, thereby obtaining a polyester imitation silk crepe fabric.

2. The polyester imitation silk crepe fabric according to claim 1 and its preparation method are characterized in that: In S1, the diameter of the TEMPO-oxidized nanocellulose is 3-5 nm, the aspect ratio is 100-200, and the mass ratio of the conventional polyester chips, maleic anhydride-grafted polyester chips, high-shrinkage polyester chips, TEMPO-oxidized nanocellulose, and the heat stabilizer is 70-75:15-20:3-5:5-10:0.2-0.

5. The shrinkage rate of the high-shrinkage polyester chips is 30-40%, and the heat stabilizer is tris(2-ethylhexyl) phosphite.

3. The polyester silk-like crepe fabric according to claim 1 and its preparation method are characterized in that: The preparation method of the maleic anhydride-grafted polyester chips in S1 comprises the following steps: S11. Mixing maleic anhydride, polyester chips, and dicumyl peroxide in a mass ratio of 100:(1-5):(0.3-1.0), and carrying out a melting reaction at 240-270 °C for 2-10 min under nitrogen protection; S12. Extracting the product obtained in S11 with an acetone or xylene solvent for 24-48 h, and then drying it under vacuum to obtain maleic anhydride-grafted polyester chips.

4. The polyester imitation silk crepe fabric and its preparation method according to claim 1, characterized in that: In the multi-stage drawing in S2, the temperature of the first-stage drawing is 70-90 °C, and the draw ratio is 1.5-2.

0. The temperature of the second-stage drawing in the multi-stage drawing is 100-120 °C, and the draw ratio is 1.2-1.

5.

5. The polyester silk-like crepe fabric according to claim 1 and its preparation method are characterized in that: In the gradient heat setting in S2, the temperature in the high-temperature zone is 180-200 °C, the tension is 0.5-1 MPa, and the residence time is 10-30 s; in the gradient heat setting, the temperature in the medium-temperature zone is 120-150 °C, with zero-tension free shrinkage, and the residence time is 20-40 s; in the gradient heat setting, the temperature in the low-temperature zone is 80-100 °C, the tension is 0.1-0.3 MPa, and the residence time is 50-70 s.

6. The polyester silk-like crepe fabric and its preparation method according to claim 1, characterized in that: In S2, the temperature of the melt spinning is 170-225 °C.

7. The polyester silk-like crepe fabric according to claim 1 and its preparation method are characterized in that: In S2, the draw ratio is 2-4, and the twist coefficient is 300-500 T / m.

8. The polyester silk-like crepe fabric and its preparation method according to claim 1, characterized in that: In S3, the warp density of the fabric is 290-350 ends / 10 cm, and the weft density is 110-130 picks / 10 cm.

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