Polybutylene succinate fine denier fiber and preparation method thereof

Abstract

The invention provides a poly (butylene succinate) fine denier fiber and a preparation method thereof. The preparation method comprises the following steps: mixing high-molecular-weight poly (butylene succinate) with low-molecular-weight poly (butylene succinate), stirring and drying to obtain poly (butylene succinate) particles for spinning; the poly (butylene succinate) particles for spinning are subjected to high-speed shearing treatment, metering and spinning treatment, and poly (butylene succinate) nascent fibers are obtained; the poly (butylene succinate) nascent fibers are subjected to bundling treatment, oiling treatment and winding and filament collection, and poly (butylene succinate) pre-oriented filaments are obtained; the poly (butylene succinate) pre-oriented yarn is subjected to drafting-heat setting treatment to obtain the poly (butylene succinate) fine denier fiber, and the poly (butylene succinate) fine denier fiber has the advantages of being high in mechanical property, small in monofilament yarn density and short in fiber diameter. The preparation method is simple in process, short in preparation time and suitable for wide popularization and application.

Description

Technical Field

[0001] The invention relates to the technical field of bio-based polyester fiber preparation, and in particular to a polybutylene succinate fine denier fiber and a preparation method thereof. Background Art

[0002] Fine denier fiber is a textile material with low single yarn density and short fiber diameter. It is widely used in clothing, home textiles, cleaning products, medical and other fields because of its soft touch, strong water absorbency and high durability.

[0003] Polybutylene succinate (PBS) is a semi-crystalline biodegradable aliphatic polyester with good biodegradability, processability and mechanical properties. It has extremely high research value and development prospects in biodegradable materials. Compared with traditional petroleum-based polyesters (such as polypropylene, polyester, spandex, etc.), PBS can be degraded after use, reducing white pollution problems and reducing environmental burden. Therefore, using PBS to make fibers has become an important direction to replace traditional petroleum-based fibers. However, due to the poor spinnability of PBS, its application is limited.

[0004] The patent technology with publication number CN 118621450 A discloses a method for preparing low melt index polybutylene succinate fiber, wherein the preparation method uses low melt index PBS as raw material, melts the low melt index PBS to form a PBS melt, and sequentially performs high frequency shearing treatment, spinning treatment, side blowing cooling treatment and drafting preparation on the PBS melt to obtain PBS fiber, wherein the fiber fineness of the PBS fiber is 150 dtex to 260 dtex. Although the patent can improve the spinnability of PBS, due to the high degree of entanglement of the molecular chain of the low melt index PBS, the fiber fineness of the PBS fiber prepared by the preparation method is relatively high (the fiber fineness is above 150 dtex), and it is difficult to meet the requirements of fine denier fiber.

[0005] The patent technology with publication number CN 101694023 A discloses a polycaprolactone polybutylene succinate sheath-core fiber, which is prepared by co-spinning polybutylene succinate and polycaprolactone to obtain a degradable sheath-core bicomponent fiber, the linear density of which is 150 dtex to 250 dtex. Although the patent can also improve the spinnability of PBS, the sheath-core bicomponent fiber prepared by the preparation method has the problem of high linear density (linear density above 150 dtex), which cannot meet the requirements of fine denier fiber.

[0006] Therefore, how to obtain a polybutylene succinate fine denier fiber is a technical problem to be solved urgently in this field. Summary of the invention

[0007] The present invention provides a method for preparing polybutylene succinate fine denier fibers. The preparation method has a simple process and can prepare polybutylene succinate fine denier fibers with high mechanical properties, small single filament linear density, and short fiber diameter.

[0008] The present invention also provides a polybutylene succinate fine denier fiber prepared by the above preparation method. Therefore, the polybutylene succinate fine denier fiber has the characteristics of high mechanical properties, small single filament linear density, and short fiber diameter.

[0009] The first aspect of the present invention provides a method for preparing polybutylene succinate fine denier fibers, comprising:

[0010] Mixing high molecular weight polybutylene succinate and low molecular weight polybutylene succinate, followed by stirring treatment and drying treatment to obtain polybutylene succinate particles for spinning;

[0011] Performing high-speed shearing treatment, metering, and spinning treatment on the polybutylene succinate particles for spinning to obtain polybutylene succinate nascent fibers;

[0012] Performing a bunching treatment, oiling treatment, and winding and taking-up on the polybutylene succinate nascent fibers to obtain polybutylene succinate pre-oriented yarns;

[0013] Performing a drawing-thermal setting treatment on the polybutylene succinate pre-oriented yarns to obtain the polybutylene succinate fine denier fibers.

[0014] In the method for preparing polybutylene succinate fine denier fibers as described above, in the polybutylene succinate fine denier fibers, the mass percentage content of the high molecular weight polybutylene succinate is 5% to 30%, and the mass percentage content of the low molecular weight polybutylene succinate is 70% to 95%.

[0015] In the method for preparing polybutylene succinate fine denier fibers as described above, the weight average molecular weight of the high molecular weight polybutylene succinate is 134803 to 156189, and the weight average molecular weight of the low molecular weight polybutylene succinate is 64781 to 89331.

[0016] In the method for preparing polybutylene succinate fine denier fibers as described above, the speed of the spinning treatment is 1500 m / min to 2500 m / min.

[0017] In the method for preparing polybutylene succinate fine denier fibers as described above, the melt index of the high molecular weight polybutylene succinate is 4 g / 10 min to 8 g / 10 min, and the melt index of the low molecular weight polybutylene succinate is 35 g / 10 min to 45 g / 10 min.

[0018] The preparation method of the polybutylene succinate fine denier fiber as described above, wherein the temperature of the drying treatment is 80°C to 100°C and the time is 5h to 7h.

[0019] The preparation method of the polybutylene succinate fine denier fiber as described above, wherein the process of high-speed shearing treatment is as follows:

[0020] Placing the polybutylene succinate particles for spinning into a screw spinning machine for high-speed shearing treatment;

[0021] The screw of the screw spinning machine is divided into a first zone, a second zone and a third zone. The temperature of the first zone is 160°C to 170°C, the temperature of the second zone is 170°C to 185°C, and the temperature of the third zone is 185°C to 195°C.

[0022] The preparation method of the polybutylene succinate fine denier fiber as described above, wherein the temperature of the spinning treatment is 195°C to 215°C.

[0023] The preparation method of the polybutylene succinate fine denier fiber as described above, in the drawing-thermal setting treatment, the drawing temperature is 30°C to 60°C, the drawing ratio is 1.5 to 1.7, and the thermal setting temperature is 60°C to 95°C.

[0024] The second aspect of the present invention provides a polybutylene succinate fine denier fiber, which is prepared by the preparation method of the polybutylene succinate fine denier fiber as described above.

[0025] The preparation method of the polybutylene succinate fine denier fiber provided by the present invention, by using high molecular weight polybutylene succinate and low molecular weight polybutylene succinate as raw materials, after mixing the high molecular weight polybutylene succinate and the low molecular weight polybutylene succinate, successively performing stirring treatment, drying treatment, high-speed shearing treatment, metering and spinning treatment and other steps, finally preparing a polybutylene succinate fine denier fiber with high mechanical properties (breaking strength is 2.20 cN / dtex to 3.04 cN / dtex), small single filament linear density (0.997 D to 1.393 D) and short fiber diameter (9.91 μm to 11.70 μm). This preparation method has a simple process and a short preparation time, and is suitable for wide promotion and application. Description of the Drawings

[0026] Figure 1 It is the external view of the polybutylene succinate fine denier fiber bobbin in Example 1 of the present invention;

[0027] Figure 2 It is the scanning electron microscope image of the polybutylene succinate fine denier fiber in Example 6 of the present invention. Detailed Embodiments

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will, in conjunction with the embodiments of the present invention, clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0029] In the following embodiments, the raw materials and reagents used, unless otherwise specified, can be obtained from commercial sources; the processes adopted, unless otherwise specified, are conventional processes in the art.

[0030] The first aspect of the present invention provides a method for preparing polybutylene succinate fine denier fibers, comprising:

[0031] Mixing high molecular weight polybutylene succinate and low molecular weight polybutylene succinate, followed by stirring treatment and drying treatment to obtain polybutylene succinate particles for spinning;

[0032] Subjecting the polybutylene succinate particles for spinning to high-speed shearing treatment, metering, and spinning treatment to obtain polybutylene succinate nascent fibers;

[0033] Subjecting the polybutylene succinate nascent fibers to bunching treatment, oiling treatment, and winding and taking up to obtain polybutylene succinate pre-oriented yarns;

[0034] Subjecting the polybutylene succinate pre-oriented yarns to drawing-thermal setting treatment to obtain the polybutylene succinate fine denier fibers.

[0035] Specifically, in the present invention, high molecular weight polybutylene succinate and low molecular weight polybutylene succinate are mixed and then subjected to stirring treatment to fully and uniformly mix the two polybutylene succinates with different molecular weights, obtaining a uniformly mixed mixture; the mixture is subjected to drying treatment to obtain polybutylene succinate particles for spinning. The drying treatment is to remove the internal bound water after the mixing of high molecular weight polybutylene succinate and low molecular weight polybutylene succinate, avoiding melt instability caused by the presence of water during high-speed shearing treatment and spinning treatment; the polybutylene succinate particles for spinning are subjected to high-speed shearing treatment to obtain a polybutylene succinate melt. The high-speed shearing treatment is to improve the fluidity of polybutylene succinate and make the polybutylene succinate melt containing two different molecular weights more uniform. Through high-speed shearing treatment, the flow of molecular chains can be accelerated, making them uniform and refined, thereby obtaining a polybutylene succinate melt with good processing performance and fluidity, which is beneficial to subsequent spinning treatment; after metering the polybutylene succinate melt, spinning treatment is carried out to obtain polybutylene succinate nascent fibers. Metering is to accurately control the quantity and proportion of the polybutylene succinate melt used in spinning treatment, avoiding unstable product quality caused by excessive or insufficient conveyance of the polybutylene succinate melt. Spinning treatment is to convert the melt into nascent fibers; the polybutylene succinate nascent fibers are subjected to bunching treatment, oiling treatment, and winding and taking up to obtain polybutylene succinate pre-oriented yarns. Bunching treatment is to collect and integrate the polybutylene succinate nascent fibers into a certain form for subsequent treatment. Oiling treatment is to protect the surface of the polybutylene succinate nascent fibers, reduce the friction coefficient of the polybutylene succinate nascent fibers, and reduce static electricity generation. Winding and taking up is to wind the polybutylene succinate nascent fibers into a certain form for storage, transportation, or subsequent processing; the polybutylene succinate pre-oriented yarns are subjected to drawing-thermal setting treatment to obtain polybutylene succinate fine denier fibers. The drawing-thermal setting treatment is a process of stretching and heat-treating the polybutylene succinate pre-oriented yarns. Drawing can improve the orientation and strength of the fibers, and heat setting fixes the shape of the fibers by heating, reducing the shrinkage of the fibers, thereby preparing polybutylene succinate fine denier fibers with high mechanical properties, small single filament linear density, and short fiber diameter.

[0036] The present invention does not make specific limitations on the specific operation of the drying treatment, and it can be selected according to actual needs. In some embodiments, a nitrogen hot air dryer can be used for drying treatment. Using a nitrogen hot air dryer for drying treatment can effectively remove the internal bound water after the mixing of high molecular weight polybutylene succinate and low molecular weight polybutylene succinate while shortening the time, which is beneficial to subsequent preparation of polybutylene succinate fine denier fibers with high mechanical properties.

[0037] In some embodiments, a metering pump is used for metering in the present invention.

[0038] In some embodiments, a screw spinning machine is used for high-speed shearing treatment in the present invention.

[0039] In some embodiments, a spinning assembly is used for spinning treatment in the present invention.

[0040] Using the above preparation method, the present invention can prepare polybutylene succinate fine denier fibers with high mechanical properties, small single filament linear density, and short fiber diameter. This preparation method has a simple process and a short preparation time, and is suitable for wide promotion and application.

[0041] In a specific embodiment, in the polybutylene succinate fine denier fiber, the mass percentage content of the high molecular weight polybutylene succinate is 5% - 30%, and the mass percentage content of the low molecular weight polybutylene succinate is 70% - 95%.

[0042] When the mass percentage content of the high molecular weight polybutylene succinate and the low molecular weight polybutylene succinate in the polybutylene succinate fine denier fiber are within the above ranges respectively, the spinnability of the overall polybutylene succinate can be improved, which is beneficial to preparing polybutylene succinate fine denier fibers with high mechanical properties, small single filament linear density, and short fiber diameter. The inventor analyzed this and believed that the reason might be as follows: Using the molecular chains of the high molecular weight polybutylene succinate with a mass percentage content of 5% - 30% as the binding chains to induce the crystallization and orientation of the low molecular weight polybutylene succinate with a mass percentage content of 70% - 95%, the molecular structure and crystallization ability of the overall polymer are improved, and finally polybutylene succinate fine denier fibers with high mechanical properties, small single filament linear density, and short fiber diameter can be prepared.

[0043] In a specific embodiment, the weight average molecular weight of the high molecular weight polybutylene succinate is 134803 - 156189, and the weight average molecular weight of the low molecular weight polybutylene succinate is 64781 - 89331.

[0044] When the weight average molecular weight of the high molecular weight polybutylene succinate and the weight average molecular weight of the low molecular weight polybutylene succinate are within the above ranges respectively, polybutylene succinate fine denier fibers with high mechanical properties, small single filament linear density, and short fiber diameter can be prepared.

[0045] Furthermore, the weight average molecular weight of the high molecular weight polybutylene succinate can be preferably 134803, and the weight average molecular weight of the low molecular weight polybutylene succinate can be preferably 89331.

[0046] In a specific embodiment, the speed of the spinning treatment is 1500 m / min to 2500 m / min.

[0047] When the parameter of the speed of the spinning treatment is within the above range, it is possible to prepare polybutylene succinate fine denier fibers with higher mechanical properties, smaller single filament linear density, and shorter fiber diameter.

[0048] Exemplarily, the speed of the spinning treatment can be any one of 1500 m / min, 1600 m / min, 1700 m / min, 1800 m / min, 1900 m / min, 2000 m / min, 2100 m / min, 2200 m / min, 2300 m / min, 2400 m / min, or 2500 m / min and the range composed of any two of them.

[0049] In a specific embodiment, the melt index of the high molecular weight polybutylene succinate is 4 g / 10 min to 8 g / 10 min, and the melt index of the low molecular weight polybutylene succinate is 35 g / 10 min to 45 g / 10 min.

[0050] When the melt index of the high molecular weight polybutylene succinate and the melt index of the low molecular weight polybutylene succinate are each within the above range, it is possible to prepare polybutylene succinate fine denier fibers with high mechanical properties, small single filament linear density, and short fiber diameter.

[0051] Exemplarily, the melt index of the high molecular weight polybutylene succinate can be any one of 4 g / 10 min, 5 g / 10 min, 6 g / 10 min, 7 g / 10 min, or 8 g / 10 min and the range composed of any two of them;

[0052] The melt index of the low molecular weight polybutylene succinate can be any one of 35 g / 10 min, 36 g / 10 min, 37 g / 10 min, 38 g / 10 min, 39 g / 10 min, 40 g / 10 min, 41 g / 10 min, 42 g / 10 min, 43 g / 10 min, 44 g / 10 min, or 45 g / 10 min and the range composed of any two of them.

[0053] In a specific embodiment, the temperature of the drying treatment is 80 °C to 100 °C, and the time is 5 h to 7 h.

[0054] When the parameters of the drying treatment temperature and time are within the above ranges, while shortening the time, it is possible to more effectively remove the internal bound water after mixing high molecular weight polybutylene succinate and low molecular weight polybutylene succinate, which is beneficial for subsequently preparing polybutylene succinate fine denier fibers with higher mechanical properties.

[0055] Exemplarily, the temperature of the drying treatment can be any one of 80°C, 85°C, 90°C, 95°C or 100°C and the range composed of any two of them;

[0056] The time can be any one of 5h, 5.5h, 6h, 6.5h or 7h and the range composed of any two of them.

[0057] In a specific embodiment, the process of performing high-speed shearing treatment is as follows:

[0058] Placing the polybutylene succinate particles for spinning in a screw spinning machine for high-speed shearing treatment;

[0059] The screw of the screw spinning machine is divided into a first zone, a second zone and a third zone. The temperature of the first zone is 160°C to 170°C, the temperature of the second zone is 170°C to 185°C, and the temperature of the third zone is 185°C to 195°C.

[0060] When performing high-speed shearing treatment by the above method, the flow of molecular chains can be accelerated to make it more uniform and refined, thereby obtaining a polybutylene succinate melt with better processing performance and fluidity.

[0061] In a specific embodiment, the temperature of the spinning treatment is 195°C to 215°C.

[0062] When the parameters of the spinning treatment temperature are within the above ranges, it is possible to prepare polybutylene succinate fine denier fibers with high mechanical properties, small single filament linear density and short fiber diameter.

[0063] Exemplarily, the temperature of the spinning treatment can be any one of 195°C, 196°C, 197°C, 198°C, 199°C, 200°C, 201°C, 202°C, 203°C, 204°C, 205°C, 206°C, 207°C, 208°C, 209°C, 210°C, 211°C, 212°C, 213°C, 214°C or 215°C and the range composed of any two of them.

[0064] In a specific embodiment, in the drawing-thermal setting treatment, the drawing temperature is 30°C to 60°C, the drawing ratio is 1.5 to 1.7, and the thermal setting temperature is 60°C to 95°C.

[0065] When the parameters of the drawing temperature, draw ratio, and heat setting temperature in the drawing-heat setting treatment are within the above ranges, the drawing can better improve the orientation and strength of the fibers, and the heat setting can better heat and fix the shape of the fibers, reducing the shrinkage of the fibers, thereby preparing polybutylene succinate fine denier fibers with high mechanical properties, small single filament linear density, and short fiber diameter.

[0066] It should be noted that the draw ratio in the present invention refers to the maximum draw ratio at the maximum extent of elongation and thinning of the polybutylene succinate fine denier fibers during the drawing process. Therefore, the mass ratio of high molecular weight polybutylene succinate to low molecular weight polybutylene succinate is different, and the draw ratio during the drawing-heat setting treatment is also different.

[0067] The second aspect of the present invention provides a polybutylene succinate fine denier fiber prepared by the above-mentioned preparation method of polybutylene succinate fine denier fibers. Therefore, the polybutylene succinate fine denier fiber has the characteristics of high mechanical properties, small single filament linear density, and short fiber diameter.

[0068] Hereinafter, the present invention will be further introduced through specific examples.

[0069] Example 1

[0070] The preparation method of the polybutylene succinate fine denier fiber provided in this example includes:

[0071] S1: After mixing high molecular weight polybutylene succinate with a weight average molecular weight of 134803 and low molecular weight polybutylene succinate with a weight average molecular weight of 89331, stirring treatment is carried out to fully mix, obtaining a uniformly mixed mixture. Subsequently, the uniformly mixed mixture is dried at 90 °C for 6 h using a nitrogen hot air dryer to remove the internal bound water, obtaining polybutylene succinate particles for spinning.

[0072] S2: The polybutylene succinate particles for spinning are placed in a screw spinning machine for high-speed shearing treatment to obtain a polybutylene succinate melt. After the polybutylene succinate melt is pushed into a metering pump for metering, spinning treatment is carried out on it using a spinning pack to obtain polybutylene succinate nascent fibers;

[0073] The screw of the screw spinning machine is divided into a first zone, a second zone, and a third zone. The temperature of the first zone is 160 °C, the temperature of the second zone is 180 °C, and the temperature of the third zone is 190 °C.

[0074] S3: The polybutylene succinate nascent fibers are subjected to bundling treatment, oiling treatment, and winding and take-up to obtain polybutylene succinate pre-oriented yarns.

[0075] S4: Feed the poly(butylene succinate) pre-oriented yarn into the drawing system through a guide roller for drawing-thermal setting treatment to obtain poly(butylene succinate) fine denier fibers.

[0076] S5: Use a winding device to wind the poly(butylene succinate) fine denier fibers onto a paper tube to obtain a poly(butylene succinate) fine denier fiber bobbin as Figure 1 shown.

[0077] Refer to the process of Example 1, and prepare the poly(butylene succinate) fine denier fibers of Examples 2-10 and the poly(butylene succinate) fibers of Comparative Examples 1-3 respectively.

[0078] The parameters such as the addition amount of high molecular weight poly(butylene succinate), the melt index of high molecular weight poly(butylene succinate), the addition amount of low molecular weight poly(butylene succinate), and the melt index of low molecular weight poly(butylene succinate) in each example and comparative example are summarized in Table 1; the parameters such as the spinning speed, the spinning temperature, the drawing temperature, the drawing ratio, and the thermal setting temperature of the spinning treatment in each example and comparative example are summarized in Table 2;

[0079] Table 1 The addition amount of high molecular weight poly(butylene succinate), the melt index of high molecular weight poly(butylene succinate), the addition amount of low molecular weight poly(butylene succinate), and the melt index of low molecular weight poly(butylene succinate) in each example and comparative example

[0080]

[0081] Table 2 The spinning speed, the spinning temperature, the drawing temperature, the drawing ratio, and the thermal setting temperature of the spinning treatment in each example and comparative example

[0082]

[0083]

[0084] Performance Characterization

[0085] 1. Figure 2 This is the scanning electron microscope image of the poly(butylene succinate) fine denier fibers in Example 6 of the present invention.

[0086] It can be Figure 2 seen that the surface of the poly(butylene succinate) fine denier fibers in Example 6 of the present invention is smooth and flat.

[0087] 2. Perform the following performance tests on the poly(butylene succinate) fine denier fibers of Examples 1-10 and the poly(butylene succinate) fibers of Comparative Examples 1-3 respectively, and the test results are shown in Table 3;

[0088] (1) Breaking strength (cN / dtex): Tested in accordance with the national standard GB / T 14344-2022 Test Method for Tensile Properties of Chemical Fiber Filaments.

[0089] (2) Elongation at break (%): Tested in accordance with the national standard GB / T 14344-2022 Test Method for Tensile Properties of Chemical Fiber Filaments.

[0090] (3) Linear density of single filament (dtex): Tested in accordance with the national standard GB / T 14344-2022 Test Method for Tensile Properties of Chemical Fiber Filaments.

[0091] (4) Fiber diameter (μm): Measured using a polarized light microscope.

[0092] Table 3 Test Results

[0093]

[0094]

[0095] Analyze the data in Table 3:

[0096] From Examples 1-10, it can be seen that the polybutylene succinate fine denier fiber provided by the present invention has the advantages of high mechanical properties (breaking strength of 2.20 cN / dtex to 3.04 cN / dtex), small linear density of single filament (0.997 D to 1.393 D), and short fiber diameter (9.91 μm to 11.70 μm).

[0097] From the comparison between Examples 1-6 and Comparative Examples 1-2, it can be seen that when low molecular weight polybutylene succinate or high molecular weight polybutylene succinate is not added, the breaking strength of the polybutylene succinate fiber in Comparative Examples 1-2 decreases, the linear density of single filament increases, and the fiber diameter increases. This shows that mixing low molecular weight polybutylene succinate and high molecular weight polybutylene succinate as raw materials improves the spinnability of the overall polybutylene succinate, which is beneficial to obtaining polybutylene succinate fine denier fibers with high mechanical properties, small linear density of single filament, and short fiber diameter. The inventor analyzed this and believes that the reason may be that the molecular chain of high molecular weight polybutylene succinate is used as a binding chain to induce the crystallization and orientation of low molecular weight polybutylene succinate, improving the molecular structure and crystallization ability of the overall polymer, and finally being able to prepare polybutylene succinate fine denier fibers with high mechanical properties, small linear density of single filament, and short fiber diameter.

[0098] From the comparison between Example 4 and Examples 7-9 and Comparative Example 3, it can be seen that by changing the speed of the spinning treatment, it is found that the breaking strength of the prepared polybutylene succinate fine denier fiber increases with the increase of the spinning treatment speed, and its breaking strength reaches the maximum of 3.04 cN / dtex when the spinning treatment speed reaches 2500 m / min. At this time, the single filament linear density of the polybutylene succinate fine denier fiber is less than 1 D.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing polybutylene succinate fine denier fiber, characterized in that: include: The high molecular weight polybutylene succinate and the low molecular weight polybutylene succinate are mixed, and then stirred and dried to obtain polybutylene succinate particles for spinning; The spinning polybutylene succinate particles are subjected to high-speed shearing treatment, metering and spinning treatment to obtain polybutylene succinate primary fibers; The polybutylene succinate spun fibers are subjected to a bunching treatment, an oiling treatment, and a winding treatment to obtain polybutylene succinate pre-oriented fibers; The polybutylene succinate pre-oriented yarn is subjected to a stretching-heat setting treatment to obtain the polybutylene succinate fine denier fiber.

2. The method for preparing polybutylene succinate fine denier fiber according to claim 1, characterized in that: In the polybutylene succinate fine denier fiber, the mass percentage of the high molecular weight polybutylene succinate is 5% to 30%, and the mass percentage of the low molecular weight polybutylene succinate is 70% to 95%.

3. The method for preparing polybutylene succinate fine denier fiber according to claim 1, characterized in that: The weight average molecular weight of the high molecular weight polybutylene succinate is 134803-156189, and the weight average molecular weight of the low molecular weight polybutylene succinate is 64781-89331.

4. The method for preparing polybutylene succinate fine denier fiber according to claim 1, characterized in that: The spinning process has a speed of 1500 m / min to 2500 m / min.

5. The method for preparing polybutylene succinate fine denier fiber according to claim 1, characterized in that: The high molecular weight polybutylene succinate has a melt index of 4 g / 10 min to 8 g / 10 min, and the low molecular weight polybutylene succinate has a melt index of 35 g / 10 min to 45 g / 10 min.

6. The method for preparing polybutylene succinate fine denier fiber according to claim 1, characterized in that: The drying process is carried out at a temperature of 80° C. to 100° C. and for a time of 5 h to 7 h.

7. The method for preparing polybutylene succinate fine denier fiber according to claim 1, characterized in that: The process of high-speed shearing treatment is as follows: placing the spinning polybutylene succinate particles in a screw spinning machine for high-speed shearing treatment; The screw of the screw spinning machine is divided into zone one, zone two and zone three. The temperature of zone one is 160°C to 170°C, the temperature of zone two is 170°C to 185°C, and the temperature of zone three is 185°C to 195°C.

8. The method for preparing polybutylene succinate fine denier fiber according to claim 1, characterized in that: The spinning treatment temperature is 195°C to 215°C.

9. The method for preparing polybutylene succinate fine denier fiber according to claim 1, characterized in that: In the stretching-heat setting treatment, the stretching temperature is 30°C to 60°C, the stretching multiple is 1.5 to 1.7, and the heat setting temperature is 60°C to 95°C.

10. A polybutylene succinate fine denier fiber, characterized in that: The fine-denier fiber is prepared by the method for preparing the polybutylene succinate fine-denier fiber according to claims 1 to 9.

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