Colored multi-groove regenerated polyester staple fiber and preparation method thereof

Abstract

The invention belongs to the technical field of functional fibers, and relates to colored multi-groove regenerated polyester staple fibers and a preparation method thereof. Preparation method: melt-blending regenerated polyester and masterbatch, and spinning through a multi-groove spinneret to obtain colored multi-groove regenerated polyester staple fibers. The fiber cross section presents a multi-groove structure, the fiber linear density is 3.33-11.11 dtex, the linear density deviation rate is 8%-8%, the fiber breaking strength is 3.3-4.5 cN / dtex, the breaking elongation is 28.2-43.5%, the ultra-long fiber content is 0-3 mg / 100 g, the defect content is 5-50 mg / 100 g, the curl number is 9-13 / 25 mm, the curl rate is 10%-16%, the fiber forming degree is ≥85%, and the color fastness is ≥4. The colored multi-groove recycled polyester staple fiber produced by the invention has good mechanical properties, color fastness and forming degree, ensures the quality of recycled polyester, realizes the efficient recycling of waste polyester, can be used in the preparation of various clothing products, and has good development prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of functional fibers and relates to colored multi-groove type regenerated polyester staple fibers and a preparation method thereof. Background Art

[0002] With the acceleration of the industrialization process, synthetic materials such as recycled polyester have been widely used in many fields such as textiles, packaging, construction, and automobiles, greatly promoting the development of social economy. However, this widespread application has also brought a significant problem: the accumulation of waste recycled polyester products and environmental pollution. In order to meet this challenge, recycled polyester fiber came into being. Its core concept is to convert waste recycled polyester materials into new recycled polyester fibers or related products through recycling, treatment, reprocessing and other processes, so as to achieve resource recycling and reduce environmental pollution. Recycled polyester fiber is widely used in many fields due to its good performance and environmental protection characteristics. In the clothing industry, recycled polyester fiber can be made into various clothing, home textile products, etc.; in the automotive industry, it can be used as a material for automotive interiors, seats and other parts; in addition, recycled polyester fiber can also be used in medical supplies, filter materials, household products and other fields.

[0003] Similar to recycled polyester products, recycled polyester fibers also have problems such as low moisture absorption and perspiration, poor dyeability, etc. This is because recycled polyester, like virgin recycled polyester, has better regularity of molecular chain and fewer hydrophilic groups. Therefore, the composite technology of solution coloring and shaped fiber spinning can effectively solve the above problems. The prepared fibers not only have high color fastness and good moisture absorption and perspiration, but also can further improve the feel, fluffiness and breathability of fibers and fabrics.

[0004] The company has applied for and obtained two patents, CN 115976688 "Preparation Method of Fine Denier Regenerated Polyester Fiber Deep Dyeable by Cationic Dyes at Normal Pressure" and CN 115961382 "Preparation Method of Coarse Denier Flat Regenerated Polyester Fiber Deep Dyeable by Cationic Dyes at Normal Pressure". On the basis of the above, the present invention has developed new special-shaped spinnerets with conjoined cross-shaped, Chinese-shaped, and Chinese-shaped conjoined, and modified the regenerated polyester slices with masterbatch, developed and produced "wool-like products", and provided green new multi-groove series of regenerated special-shaped regenerated polyester staple fiber raw materials, further improving the high-value utilization level of recycled recycled polyester raw materials, and striving to achieve the "dual carbon" goal. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to provide colored multi-groove type regenerated polyester staple fibers and a preparation method thereof.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The invention discloses a method for preparing colored multi-groove regenerated polyester staple fibers. Regenerated polyester chips and color master batches are melt-blended and spun to obtain colored multi-groove regenerated polyester staple fibers.

[0008] As the preferred technical solution:

[0009] In the method for preparing the colored multi-groove regenerated polyester staple fibers as described above, the intrinsic viscosity of the regenerated polyester chips is 0.65-0.75 dL / g and the melting point is 240-260°C.

[0010] The preparation method of the colored multi-groove recycled polyester staple fiber as described above, the preparation method of the masterbatch is to mix the environmentally friendly color powder with the pretreated recycled polyester powder in a mass ratio of 30-50:50-70, add auxiliary agents and mix evenly, and then melt extrude, cool, granulate, sieve, and dry to make the masterbatch.

[0011] The preparation method of the colored multi-groove regenerated polyester staple fiber as described above, the pretreatment method of the regenerated polyester powder is to add nano calcium stearate to the regenerated polyester powder, the particle size of the nano calcium stearate is 100-300nm, after fully mixing, dry at 65°C and 115°C for 2h and 5h respectively, put into bags and seal for use.

[0012] In the method for preparing the colored multi-groove regenerated polyester staple fibers as described above, the amount of nano calcium stearate added is 0.001-0.008% of the weight of the regenerated polyester powder.

[0013] In the method for preparing the colored multi-groove regenerated polyester staple fibers as described above, the mass ratio of the regenerated polyester to the masterbatch is 80-99:1-20.

[0014] The preparation method of the colored multi-groove regenerated polyester staple fiber as described above, the process of melt-blending and spinning the regenerated polyester and the masterbatch to obtain the colored multi-groove regenerated polyester staple fiber is as follows: the regenerated polyester and the masterbatch are melt-extruded, spun, cooled, wound and formed in sequence through a screw extruder to obtain the primary yarn.

[0015] The preparation method of the colored multi-groove regenerated polyester staple fiber as described above, the process parameters of the melt blending spinning include: the temperature of the first zone of the screw is 275℃-285℃, the temperature of the second zone is 280℃-290℃, the temperature of the third zone is 285℃-295℃, the temperature of the fourth zone is 290℃-300℃, the temperature of the fifth zone is 285℃-295℃, the temperature of the sixth zone is 280℃-290℃, the temperature of the spinning box is 285-295℃, the spinneret is one of a conjoined cross-shaped 450 holes, a W-shaped 720 holes, a conjoined W-shaped 244 holes and a M-shaped 800 holes, the pump supply is 700-900g / min, the pressure difference between the annular blowing air inlet and return air is 500-750Pa, and the winding speed is 950-1100m / min.

[0016] The method for preparing the colored multi-groove regenerated polyester staple fiber as described above comprises bundling, drawing, tensile heat setting, curling, oiling, drying and cutting the spun silk to obtain the colored multi-groove regenerated polyester staple fiber.

[0017] The preparation method of the colored multi-groove regenerated polyester staple fiber as described above, the process parameters of the melt blending spinning include: the oil bath temperature in the first oil bath drawing is 60-65°C, the second drawing temperature is 100-120°C, the drawing multiple is 3-4 times, and the tensile heat setting temperature is 160-180°C.

[0018] The present invention also provides colored multi-groove regenerated polyester staple fibers prepared by the preparation method of colored multi-groove regenerated polyester staple fibers as described in any of the above items, which have a special-shaped structure, a multi-groove structure in the fiber cross-section, a fiber forming degree ≥85%, a color fastness ≥4, a fiber linear density of 3.33-11.11 dtex, and a linear density deviation rate of -8%-8%.

[0019] As the preferred technical solution:

[0020] The colored multi-groove regenerated polyester staple fiber as described above has a fiber breaking strength of 3.3-4.5 cN / dtex, an elongation at break of 28.2-43.5%, an extra-long fiber content of 0-3 mg / 100 g, a defect content of 5-50 mg / 100 g, a curl number of 9-13 / 25 mm, and a curl rate of 10%-16%.

[0021] As the preferred technical solution:

[0022] The colored multi-groove regenerated polyester staple fibers as described above, the pretreatment of the regenerated polyester powder also includes hyperbranched cyclodextrin and modified boron nitride particles, and the weight ratio of the hyperbranched cyclodextrin, modified boron nitride particles and nano calcium stearate is 2:1:1.

[0023] The colored multi-groove regenerated polyester staple fiber as described above, the modified boron nitride particles are prepared by the following steps: hydrogen-terminated phenyl polysiloxane and boron nitride particles are mixed in a weight ratio of 1:2, stirred at 120 r / min for 2 hours, and finally vacuum dried at 60°C for 12 hours to obtain modified boron nitride particles, the particle size of the boron nitride particles is 30 μm.

[0024] Based on the above scheme, through the combination of hyperbranched cyclodextrin, modified boron nitride particles and nano-calcium stearate, the addition of hyperbranched cyclodextrin can effectively improve the plasticizing properties of the fiber, thereby effectively improving the elongation at break of the fiber. The modified boron nitride particles and nano-calcium stearate are combined to enhance the hyperbranched cyclodextrin, and the breaking strength and elongation at break of the fiber are improved through the complementary fluidity and particle size of the two. The binding strength between the modified boron nitride particles and nano-calcium stearate decreases, thereby further enhancing the fluidity. After the fiber is generated, the modified boron nitride particles are combined with the hyperbranched cyclodextrin and the polyester fiber, thereby further enhancing the breaking strength of the polyester fiber.

[0025] Principle of the invention:

[0026] Waste polyester materials are melted, depolymerized, and repolymerized by chemical regeneration to become recycled polyester chips. The molecular structure and properties of the recycled polyester fiber can be adjusted by appropriate depolymerizers and repolymerization conditions to meet different application requirements. In the textile field, before melt spinning, the colorant or masterbatch is evenly mixed with the recycled polyester melt to make the colorant evenly distributed inside the fiber to obtain colored regenerated polyester fiber. If a spinneret with special-shaped holes is used in the spinning process, the melt will form fibers with non-circular cross-sections during extrusion to obtain special-shaped colored regenerated polyester fibers. The regenerated polyester fiber obtained by solution coloring and special-shaped fiber technology can not only improve the color fastness of the fiber, but also avoid the wastewater pollution generated in the traditional printing and dyeing process; at the same time, the solution coloring technology makes it unnecessary to dye the fiber in the subsequent processing, reducing production costs and energy consumption. In addition, the profiling treatment not only changes the appearance of the fiber, but also has a significant impact on its performance, giving the fiber better gloss, fluffiness, air permeability and anti-pilling properties. The special-shaped cross-section also increases the specific surface area and porosity of the fiber, which is beneficial to improve the fiber's moisture absorption and warmth retention.

[0027] Based on this, the present invention prepares colored multi-groove regenerated polyester staple fibers by controlling the addition amount of masterbatches of different color systems and selecting specific special-shaped spinnerets. The fiber cross-sectional profile, fiber breaking strength, defects, color fastness, etc. are explored by controlling the spinning temperature, pump supply, spinning cooling and blowing conditions, spinning speed, drawing temperature, drawing multiple, heat setting temperature and other technical parameters.

[0028] Beneficial effects:

[0029] (1) The preparation method used in the present invention has low requirements on production equipment, high efficiency, and can be produced on a large scale.

[0030] (2) The colored multi-groove regenerated polyester staple fiber prepared by the present invention is a high-value application of regenerated polyester fiber. The fiber has the characteristics of both color and special shape, which improves the recycling level of regenerated polyester fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Optical microscope photograph of the cross section of the colored multi-groove regenerated polyester staple fiber prepared in Example 1.

[0032] Figure 2 Optical microscope photograph of the cross section of the colored multi-groove regenerated polyester staple fiber prepared in Example 2.

[0033] Figure 3 Optical microscope photograph of the cross section of the colored multi-groove regenerated polyester staple fiber prepared in Example 3.

[0034] Figure 4 Optical microscope photograph of the cross section of the colored multi-groove regenerated polyester staple fiber prepared in Example 4. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0036] The following are the test methods for the relevant performance indicators in each embodiment and comparative example:

[0037] Intrinsic viscosity of recycled polyester chips: tested in accordance with SN / T 1015-2001 standard.

[0038] Melting point of recycled polyester chips: tested in accordance with JJG 701-2008 standard.

[0039] Linear density and extra-long fiber content: measured in accordance with GB / T 14335-2008.

[0040] Breaking strength and breaking elongation: measured in accordance with GB / T 14337-2022, where the tensile speed is 30 mm / min.

[0041] Defect content: Determined in accordance with GB / T 14339-2008 standard.

[0042] Curl number and curl rate: measured in accordance with GB / T 14338-2022 standard.

[0043] Degree of irregularity: measured in accordance with FZ / T 50002-2013 standard.

[0044] Color fastness: measured in accordance with GB / T 3921-2008.

[0045] Example 1

[0046] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0047] (1) Preparation of raw materials;

[0048] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.65dL / g and the melting point is 251℃.

[0049] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0050] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 740 g / min, spinneret is a conjoined cross-shaped 450-hole, the pressure difference between the annular blowing air inlet and return air is 600Pa, and the winding speed is 1000m / min;

[0051] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0052] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64℃, the second-stage drafting temperature is 110℃, the drafting multiple is 3.25 times, and the temperature of tense heat setting is 170℃;

[0053] The linear density of the colored multi-groove recycled polyester staple fiber is 5.55 dtex, and the linear density deviation rate is 1.0%. The fiber breaking strength is 4.0 cN / dtex, the breaking elongation is 40.9%, the ultra-long fiber content is 1.2 mg / 100g, the defect content is 10.2 mg / 100g, the number of crimps is 12.5 / 25mm, the crimp rate is 13.5%, the fiber forming degree is 90%, and the color fastness is 4-5.

[0054] Comparative Example 1

[0055] Patent application CN105177743, a method for producing fine and micro-fine flat regenerated polyester filaments using recycled polyester bottle flakes, the only difference is that the melt after viscosity adjustment is extruded into a tow in a straight line, the tow is drawn and shaped by the first and second hot rollers, and then enters the network nozzle through the third guide roller, and is wound to obtain fine flat regenerated polyester filaments. The melt after viscosity adjustment has an intrinsic viscosity of 0.741 dL / g, the breaking strength of the flat regenerated polyester filament is 3.6 cN / dtex, and the breaking elongation is 23.0%.

[0056] Compared with the embodiment, the intrinsic viscosity of the fine denier flat recycled polyester in the comparative example is higher, and the fiber breaking strength prepared from the high viscosity melt is also higher, but the breaking strength is not much different from the breaking strength in the embodiment, and the elongation at break is only 23%, which is much lower than that in the embodiment, indicating that the preparation method of the present invention can achieve better breaking strength and elongation at break at a lower viscosity.

[0057] Comparative Example 2

[0058] Patent application CN110886031, a method for preparing high color fastness solution-dyed regenerated fiber, the only difference is that: the high color fastness solution-dyed regenerated fiber has a breaking strength of 4.26 cN / dtex and a color fastness of level 4.

[0059] Example 2

[0060] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0061] (1) Preparation of raw materials;

[0062] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.67dL / g and the melting point is 251℃.

[0063] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0064] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 770 g / min, spinneret is a W-shaped 720 hole, the pressure difference between the annular blowing air inlet and return air is 650Pa, and the winding speed is 950m / min.

[0065] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0066] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64°C, the temperature of the second-stage drafting is 110°C, the drafting multiple is 3.42 times, and the temperature of tense heat setting is 170°C;

[0067] The linear density of the colored multi-groove recycled polyester staple fiber is 3.33 dtex, and the linear density deviation rate is -0.5%. The fiber breaking strength is 4.2cN / dtex, the breaking elongation is 38.6%, the ultra-long fiber content is 0.4mg / 100g, the defect content is 8.8mg / 100g, the number of crimps is 12.3 / 25mm, the crimp rate is 13.4%, the fiber forming degree is 89%, and the color fastness is 4-5.

[0068] Example 3

[0069] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0070] (1) Preparation of raw materials;

[0071] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.66dL / g and the melting point is 253℃.

[0072] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0073] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 867 g / min, spinneret is a conjoined Wang-shaped 244-hole, the pressure difference between the annular blowing air inlet and return air is 700Pa, and the winding speed is 1000m / min;

[0074] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0075] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64°C, the temperature of the second-stage drafting is 110°C, the drafting multiple is 3.21 times, and the temperature of tense heat setting is 170°C;

[0076] The linear density of the colored multi-groove recycled polyester staple fiber is 11.11 dtex, and the linear density deviation rate is 2.3%. The fiber breaking strength is 3.5cN / dtex, the breaking elongation is 40.8%, the ultra-long fiber content is 0mg / 100g, the defect content is 16.2mg / 100g, the number of crimps is 10.1 / 25mm, the crimp rate is 14.6%, the fiber forming degree is 91%, and the color fastness is 4-5.

[0077] Example 4

[0078] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0079] (1) Preparation of raw materials;

[0080] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.67dL / g and the melting point is 255℃.

[0081] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0082] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 283℃, zone 2 temperature 288℃, zone 3 temperature 293℃, zone 4 temperature 298℃, zone 5 temperature 293℃, zone 6 temperature 288℃, spinning box temperature 290℃, pump supply 852 g / min, spinneret is M-shaped 800 holes, the pressure difference between the annular blowing air inlet and return air is 680Pa, and the winding speed is 1050m / min.

[0083] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0084] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64°C, the temperature of the second-stage drafting is 110°C, the drafting multiple is 3.43 times, and the temperature of tense heat setting is 170°C;

[0085] The linear density of the colored multi-groove recycled polyester staple fiber is 3.33 dtex, and the linear density deviation rate is 0.6%. The fiber breaking strength is 4.3cN / dtex, the breaking elongation is 41.1%, the ultra-long fiber content is 0mg / 100g, the defect content is 6.4mg / 100g, the number of crimps is 12.0 / 25mm, the crimp rate is 12.8%, the fiber forming degree is 90%, and the color fastness is 4-5.

[0086] Example 5

[0087] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0088] (1) Preparation of raw materials;

[0089] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.68dL / g and the melting point is 256℃.

[0090] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0091] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 30:70, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 740 g / min, spinneret is a conjoined cross-shaped 450 hole, the pressure difference between the annular blowing air inlet and return air is 600Pa, and the winding speed is 1000m / min.

[0092] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0093] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64°C, the temperature of the second-stage drafting is 110°C, the drafting multiple is 3.23 times, and the temperature of tense heat setting is 170°C;

[0094] The linear density of colored multi-groove recycled polyester staple fiber is 5.57dtex, the linear density deviation rate is 1.2%, the fiber breaking strength is 3.9cN / dtex, the breaking elongation is 38.5%, the ultra-long fiber content is 0.8mg / 100g, the defect content is 8.0mg / 100g, the number of crimps is 11.5 / 25mm, the crimp rate is 13.4%, the fiber forming degree is 93%, and the color fastness is 4-5.

[0095] Example 6

[0096] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0097] (1) Preparation of raw materials;

[0098] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.66dL / g and the melting point is 253℃.

[0099] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0100] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 80:20, and the process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 740 g / min, spinneret is a conjoined cross-shaped 450-hole, the pressure difference between the annular blowing air inlet and return air is 600Pa, and the winding speed is 1000m / min.

[0101] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0102] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64°C, the temperature of the second-stage drafting is 110°C, the drafting multiple is 3.26 times, and the temperature of tense heat setting is 170°C;

[0103] The linear density of the colored multi-groove recycled polyester staple fiber is 5.54 dtex, and the linear density deviation rate is -1.5%. The fiber breaking strength is 3.8cN / dtex, the breaking elongation is 37.4%, the ultra-long fiber content is 0mg / 100g, the defect content is 7.2mg / 100g, the number of crimps is 11.3 / 25mm, the crimp rate is 13.2%, the fiber forming degree is 92%, and the color fastness is 4-5.

[0104] Example 7

[0105] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0106] (1) Preparation of raw materials;

[0107] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.65dL / g and the melting point is 251℃.

[0108] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0109] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 790 g / min, spinneret is a W-shaped 720 hole, the pressure difference between the annular blowing air inlet and return air is 660Pa, and the winding speed is 950m / min.

[0110] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0111] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64°C, the temperature of the second-stage drafting is 110°C, the drafting multiple is 3.24 times, and the temperature of tense heat setting is 170°C;

[0112] The linear density of the colored multi-groove recycled polyester staple fiber is 3.42 dtex, and the linear density deviation rate is 0.8%. The fiber breaking strength is 3.9 cN / dtex, the breaking elongation is 38.1%, the ultra-long fiber content is 0.6 mg / 100g, the defect content is 6.0 mg / 100g, the number of crimps is 12.6 / 25mm, the crimp rate is 12.4%, the fiber forming degree is 90%, and the color fastness is 4-5.

[0113] Example 8

[0114] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0115] (1) Preparation of raw materials;

[0116] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.67dL / g and the melting point is 255℃.

[0117] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0118] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 278℃, zone 2 temperature 283℃, zone 3 temperature 288℃, zone 4 temperature 293℃, zone 5 temperature 288℃, zone 6 temperature 283℃, spinning box temperature 286℃, pump supply 770 g / min, spinneret is a W-shaped 720 hole, the pressure difference between the annular blowing air inlet and return air is 660Pa, and the winding speed is 950m / min.

[0119] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0120] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64℃, the temperature of the second-stage drafting is 110℃, the drafting multiple is 3.27 times, and the temperature of tense heat setting is 170℃;

[0121] The linear density of the colored multi-groove recycled polyester staple fiber is 3.35 dtex, and the linear density deviation rate is 0.5%. The fiber breaking strength is 4.0 cN / dtex, the breaking elongation is 39.2%, the super long fiber content is 0 mg / 100g, the defect content is 5.0 mg / 100g, the number of crimps is 12.2 / 25mm, the crimp rate is 12.7%, the fiber forming degree is 91%, and the color fastness is 4-5.

[0122] Example 9

[0123] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0124] (1) Preparation of raw materials;

[0125] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.66dL / g and the melting point is 253℃.

[0126] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0127] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 740 g / min, spinneret is a conjoined Wang-shaped 244 holes, the pressure difference between the annular blowing air inlet and return air is 700Pa, and the winding speed is 1000m / min;

[0128] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0129] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64℃, the temperature of the second-stage drafting is 110℃, the drafting multiple is 3.18 times, and the temperature of tense heat setting is 170℃;

[0130] The linear density of the colored multi-groove recycled polyester staple fiber is 11.11 dtex, and the linear density deviation rate is 2.2%. The fiber breaking strength is 3.6cN / dtex, the breaking elongation is 42.3%, the ultra-long fiber content is 1.2mg / 100g, the defect content is 20.0mg / 100g, the number of crimps is 9.8 / 25mm, the crimp rate is 14.3%, the fiber forming degree is 93%, and the color fastness is 4-5.

[0131] Example 10

[0132] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0133] (1) Preparation of raw materials;

[0134] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.68dL / g and the melting point is 257℃.

[0135] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0136] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 867 g / min, spinneret is a conjoined Wang-shaped 244-hole, the pressure difference between the annular blowing air inlet and return air is 700Pa, and the winding speed is 1000m / min;

[0137] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0138] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64℃, the second-stage drafting temperature is 110℃, the drafting multiple is 3.22 times, and the temperature of tense heat setting is 170℃;

[0139] The linear density of colored multi-groove recycled polyester staple fiber is 11.09 dtex, and the linear density deviation rate is -2.4%. The fiber breaking strength is 3.7cN / dtex, the breaking elongation is 41.8%, the ultra-long fiber content is 0.6mg / 100g, the defect content is 18.8mg / 100g, the number of crimps is 10.2 / 25mm, the crimp rate is 14.7%, the fiber forming degree is 92%, and the color fastness is 4-5.

[0140] Embodiment 11

[0141] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0142] (1) Preparation of raw materials;

[0143] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.66dL / g and the melting point is 253℃.

[0144] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0145] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 283℃, zone 2 temperature 288℃, zone 3 temperature 293℃, zone 4 temperature 298℃, zone 5 temperature 293℃, zone 6 temperature 288℃, spinning box temperature 290℃, pump supply 852 g / min, spinneret is M-shaped 800 holes, the pressure difference between the annular blowing air inlet and return air is 680Pa, and the winding speed is 1050m / min.

[0146] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0147] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 66°C, the temperature of the second-stage drafting is 110°C, the drafting multiple is 3.34 times, and the temperature of tense heat setting is 170°C;

[0148] The linear density of the colored multi-groove recycled polyester staple fiber is 3.34dtex, and the linear density deviation rate is 0.3%. The fiber breaking strength is 4.2cN / dtex, the breaking elongation is 37.6%, the ultra-long fiber content is 1.4mg / 100g, the defect content is 6.4mg / 100g, the number of crimps is 12.5 / 25mm, the crimp rate is 12.3%, the fiber forming degree is 89%, and the color fastness is 4-5.

[0149] Example 12

[0150] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0151] (1) Preparation of raw materials;

[0152] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.65dL / g and the melting point is 251℃.

[0153] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0154] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the mass ratio of recycled polyester to masterbatch is 90:10, and the process parameters of melt blending spinning are: screw zone 1 temperature 283℃, zone 2 temperature 288℃, zone 3 temperature 293℃, zone 4 temperature 298℃, zone 5 temperature 293℃, zone 6 temperature 288℃, spinning box temperature 290℃, pump supply 852 g / min, spinneret is M-shaped 800 holes, the pressure difference between the annular blowing air inlet and return air is 680Pa, and the winding speed is 1050m / min.

[0155] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0156] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 66°C, the temperature of the second-stage drafting is 110°C, the drafting multiple is 3.40 times, and the temperature of tense heat setting is 170°C;

[0157] The linear density of the colored multi-groove recycled polyester staple fiber is 3.33 dtex, and the linear density deviation rate is 0.7%. The fiber breaking strength is 4.1 cN / dtex, the breaking elongation is 38.8%, the ultra-long fiber content is 1.6 mg / 100g, the defect content is 7.0 mg / 100g, the number of crimps is 12.1 / 25mm, the crimp rate is 12.9%, the fiber forming degree is 90%, and the color fastness is 4-5.

[0158] Embodiment 13

[0159] Colored multi-groove regenerated polyester staple fiber and preparation method thereof, the specific steps are as follows:

[0160] (1) Preparation of raw materials;

[0161] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.65dL / g and the melting point is 251℃.

[0162] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0163] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the added amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the added amount of hyperbranched cyclodextrin is 0.008% of the weight of recycled polyester powder, and the mass ratio of recycled polyester to masterbatch is 90:10.

[0164] The process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 740 g / min, spinneret is a conjoined cross-shaped 450-hole, the pressure difference between the annular blowing inlet and return air is 600Pa, and the winding speed is 1000m / min.

[0165] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0166] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64℃, the second-stage drafting temperature is 110℃, the drafting multiple is 3.25 times, and the temperature of tense heat setting is 170℃;

[0167] The fiber breaking strength of the colored multi-groove recycled polyester staple fiber is 4.1 cN / dtex, and the breaking elongation is 41.1%.

[0168] Embodiment 14

[0169] (1) Preparation of raw materials;

[0170] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.65dL / g and the melting point is 251℃.

[0171] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0172] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the added amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the added amount of modified boron carbide particles is 0.004% of the weight of recycled polyester powder, and the mass ratio of recycled polyester to masterbatch is 90:10.

[0173] The process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 740 g / min, spinneret is a conjoined cross-shaped 450-hole, the pressure difference between the annular blowing inlet and return air is 600Pa, and the winding speed is 1000m / min.

[0174] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0175] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64℃, the second-stage drafting temperature is 110℃, the drafting multiple is 3.25 times, and the temperature of tense heat setting is 170℃;

[0176] The fiber breaking strength of the colored multi-groove recycled polyester staple fiber is 4.2 cN / dtex and the breaking elongation is 40.4%.

[0177] Embodiment 15

[0178] (1) Preparation of raw materials;

[0179] Recycled polyester chips: The manufacturer is Suzhou Youfu Textile Co., Ltd. The intrinsic viscosity of the recycled polyester chips is 0.65dL / g and the melting point is 251℃.

[0180] (2) The recycled polyester chips and the masterbatch are dried separately (first dried at 80°C for 2 hours, then vacuum dried at 120°C for 10 hours), and then the recycled polyester chips and the masterbatch are distributed by an injection machine and then enter a screw extruder for melt extrusion, spinning, cooling, winding, and molding to obtain colored multi-groove recycled polyester primary yarn;

[0181] Among them, the mass ratio of environmentally friendly color powder to recycled polyester powder is 50:50, the addition amount of nano calcium stearate is 0.004% of the weight of recycled polyester powder, the addition amount of hyperbranched cyclodextrin is 0.008% of the weight of recycled polyester powder, the addition amount of modified boron carbide particles is 0.004% of the weight of recycled polyester powder, and the mass ratio of recycled polyester to masterbatch is 90:10.

[0182] The process parameters of melt blending spinning are: screw zone 1 temperature 280℃, zone 2 temperature 285℃, zone 3 temperature 290℃, zone 4 temperature 295℃, zone 5 temperature 290℃, zone 6 temperature 285℃, spinning box temperature 288℃, pump supply 740 g / min, spinneret is a conjoined cross-shaped 450-hole, the pressure difference between the annular blowing inlet and return air is 600Pa, and the winding speed is 1000m / min.

[0183] (3) bundling, drawing, tense heat setting, curling, oiling, and relaxing heat setting the colored multi-groove regenerated polyester spun yarn to obtain colored multi-groove regenerated polyester fibers;

[0184] Among them, the process parameters of post-spinning drafting are: the oil bath temperature of the first-stage oil bath drafting is 64℃, the second-stage drafting temperature is 110℃, the drafting multiple is 3.25 times, and the temperature of tense heat setting is 170℃;

[0185] The fiber breaking strength of the colored multi-groove recycled polyester staple fiber is 4.5 cN / dtex and the breaking elongation is 41.6%.

Claims

1. A method for preparing colored multi-groove regenerated polyester staple fibers, characterized in that: The recycled polyester and the masterbatch are melt-blended, and the colored multi-groove type recycled polyester staple fibers are obtained after spinning through a multi-groove type spinneret; the preparation method of the masterbatch is to mix the environmentally friendly color powder and the pretreated recycled polyester powder in a mass ratio of 30-50:50-70, and add an auxiliary agent to mix evenly, and then melt extrude, cool, granulate, sieve, and dry to obtain the masterbatch; The pretreatment of recycled polyester powder includes: adding nano calcium stearate, hyperbranched cyclodextrin and modified boron nitride particles to the recycled polyester powder, wherein the weight ratio of the hyperbranched cyclodextrin, the modified boron nitride particles and the nano calcium stearate is 2:1:1; the modified boron nitride particles are prepared by the following steps: hydrogen-terminated phenyl polysiloxane and boron nitride particles are mixed in a weight ratio of 1:2, stirred at 120 r / min for 2 hours, and finally vacuum dried at 60°C for 12 hours to obtain modified boron nitride particles.

2. The method for preparing colored multi-groove regenerated polyester staple fibers according to claim 1, characterized in that: The intrinsic viscosity of recycled polyester chips is 0.65-0.75 dL / g and the melting point is 240-260°C.

3. The method for preparing colored multi-groove regenerated polyester staple fibers according to claim 2, characterized in that: The added amount of nano calcium stearate is 0.001-0.008% of the weight of the recycled polyester powder, and the mass ratio of the recycled polyester to the masterbatch is 80-99:1-20.

4. The method for preparing colored multi-groove regenerated polyester staple fibers according to claim 3, characterized in that: The process of melt blending and spinning recycled polyester and masterbatch to obtain colored multi-groove recycled polyester staple fibers is as follows: the recycled polyester and masterbatch are melt extruded, spun, cooled, wound, and formed in sequence through a screw extruder to obtain primary yarns. The process parameters of melt blending and spinning include: screw zone 1 temperature 275℃-285℃, zone 2 temperature 280℃-290℃, zone 3 temperature 285℃-295℃, zone 4 temperature 290℃-300℃ ℃, the temperature of zone five is 285℃-295℃, the temperature of zone six is ​​280℃-290℃, the temperature of spinning box is 285-295℃, the spinneret is one of the conjoined cross-shaped 450 holes, the W-shaped 720 holes, the conjoined W-shaped 244 holes and the M-shaped 800 holes, the pump supply is 700-900g / min, the pressure difference between the annular air inlet and return air is 500-750Pa, and the winding speed is 950-1100m / min.

5. The method for preparing colored multi-groove regenerated polyester staple fibers according to claim 4, characterized in that: The primary silk is subjected to bundling, drawing, tensile heat setting, curling, oiling, drying and cutting to obtain colored multi-groove regenerated polyester staple fibers. The process parameters of melt blending spinning include: oil bath temperature of 60-65°C in the first-stage oil bath drawing, 100-120°C in the second-stage drawing, drawing multiple of 3-4 times, and tensile heat setting temperature of 160-180°C.

6. The colored multi-groove regenerated polyester staple fiber prepared by the method for preparing the colored multi-groove regenerated polyester staple fiber according to any one of claims 1 to 5, characterized in that: It has a special-shaped structure, the fiber cross-section presents a multi-groove structure, the fiber forming degree is ≥85%, the color fastness is ≥4, the fiber linear density is 3.33-11.11dtex, the linear density deviation rate is -8%-8%, the fiber breaking strength is 3.3-4.5cN / dtex, the breaking elongation is 28.2-43.5%, the extra-long fiber content is 0-3mg / 100g, the defect content is 5-50mg / 100g, the number of crimps is 9-13 / 25mm, and the crimp rate is 10%-16%.

Images