Processing technology of colored superfine flat elastic polyester network yarn

Abstract

The application relates to the field of fiber processing, and particularly discloses a processing technology of colored superfine flat elastic polyester network yarn, which comprises the following steps: S1, PET chips are subjected to oxygen plasma treatment, then maleic anhydride coated nanometer crystal whiskers are added under the condition of 60-70 DEG C, the temperature is gradually increased to 200-210 DEG C for pre-crystallization for 24-28 h, and then drying is carried out under the condition of 155-165 DEG C, so that crystallized chips are obtained; S2, the crystallized chips are subjected to melt spinning, so that fiber yarns are obtained; and S3, the fiber yarns are subjected to ring blowing air cooling, spinning oiling, and elastic treatment, so that finished polyester network yarns are obtained. The finished polyester network yarns have the advantages of good dyeing effect, stable color, high strength, good elasticity, easy control of flatness, and good stability.

Description

Technical Field

[0001] This application relates to the field of fiber processing, and more specifically, it relates to a processing technology for colored ultrafine flat elastic polyester network yarn. Background Technology

[0002] Polyester network yarn is a type of network yarn made from polyester fiber, and it is generally used in clothing, industry, textile industry and other fields. Polyester network yarn not only has excellent elasticity, but is also not easily deformed. At the same time, polyester network yarn has low moisture absorption and good abrasion resistance, heat resistance and corrosion resistance.

[0003] However, polyester network yarn has poor dyeing uniformity and is prone to color instability. In addition, if polyester network yarn is to achieve an ultra-fine shape, its strength is easily reduced, and its flatness is difficult to control, resulting in poor stability.

[0004] Therefore, how to prepare a new polyester network yarn that simultaneously possesses the advantages of good dyeing effect, stable color, ultra-fineness and high strength, good elasticity, easy control of flatness, and good stability is a problem that needs to be solved. Summary of the Invention

[0005] In order to prepare a new polyester network yarn that simultaneously possesses the advantages of good dyeing effect, stable color, ultrafineness and high strength, good elasticity, easy control of flatness, and good stability, this application provides a processing technology for colored ultrafine flat elastic polyester network yarn.

[0006] This application provides a processing technology for colored ultrafine flat elastic polyester network yarn, which adopts the following technical solution: A processing technology for colored ultrafine flat elastic polyester network yarn includes the following steps:

[0007] S1. The PET slices are treated with oxygen plasma, and then maleic anhydride-coated nanocrystals are added at 60-70℃. The temperature is gradually increased to 200-210℃ for pre-crystallization for 24-28 hours, and then dried at 155-165℃ to obtain crystalline slices.

[0008] S2. Crystallized slices are melt-spun to obtain fiber filaments;

[0009] S3. The fiber filaments are cooled by a ring blower, spun onto an oiling rack, and texturized to obtain the finished polyester network yarn.

[0010] By adopting the above technical solution, after PET chips are treated with oxygen plasma, the surface roughness of the chips is increased, which facilitates the introduction of polar groups and increases the surface energy of the PET chips. The polar groups and the larger surface area can increase the nucleation points of crystallization, promote the orderly arrangement of PET molecular chains, improve the pre-crystallization effect, and make PET crystals more uniform and fine, thereby improving the elasticity and mechanical strength of polyester network yarns.

[0011] After PET chips are treated with oxygen plasma, maleic anhydride is heated at 60-70℃ to produce viscosity, which allows maleic anhydride-coated nanofibers to be loaded onto the surface of the PET chips. At 200-210℃, the maleic anhydride reaches its boiling point and gradually flows out. During the pre-crystallization process, the whiskers on the surface of the PET chips can be introduced and intercalated into the polyester molecular chains. Using the whiskers as crystallization nuclei, the orderly arrangement of PET molecular chains is promoted, thereby promoting the formation of a crystalline network. Furthermore, the intercalation effect of the whiskers can refine the crystal size of the polyester network filaments, so that the ultrafine polyester network filaments still have good mechanical properties. It can also improve the flexibility and wear resistance of the polyester network filaments. At the same time, the nano-sized whiskers can reduce the activation energy of polyester network filament crystallization, accelerate the crystallization process, and increase interfacial strength and durability.

[0012] By limiting the drying temperature, a more stable crystal structure is formed in the PET chips after pre-crystallization, ensuring dimensional and crystallization stability, thereby ensuring that the polyester network yarn has good mechanical properties.

[0013] The crystallized slices undergo melt spinning, ring blowing cooling, spinning oiling, and texturing treatment to make the polyester network yarn easy to dye. This improves the dyeing effect and dyeing uniformity while balancing the color. The prepared microfiber yarn still has high strength and good elasticity, as well as uniform flatness and good stability.

[0014] Preferably, the maleic anhydride-coated nanocrystals are prepared from maleic anhydride melt and nanocrystal material in a mass ratio of 1:1.5-3.

[0015] By adopting the above technical solution, the viscosity of maleic anhydride melt is utilized to facilitate adhesion to the surface of nano-whiskers. Maleic anhydride melt can promote the adhesion of nano-whiskers to the surface of PET chips. During the pre-crystallization process, nano-whiskers can increase the interface area and crystallization nuclei, promote the orderly arrangement of PET chip molecular chains, form a certain crystallization network, and help improve the mechanical properties and dimensional stability of PET. When heated at 200-210℃ for 24-28 hours, maleic anhydride gradually decomposes thermally, making it less likely to remain in the polyester network yarn and affect its performance, thus ensuring the crystallization effect of the polyester network yarn.

[0016] Preferably, the nanocrystal material is composed of modified hydroxyapatite whiskers and hydroxyl-modified boron nitride in a mass ratio of 1:0.5-2.

[0017] By employing the above technical solution, modified hydroxyapatite whiskers and hydroxyl-modified boron nitride are combined. The modified hydroxyapatite whiskers act as a nucleating agent for PET crystallization, lowering the energy barrier and promoting PET crystallization. Furthermore, the spiky whisker penetration effect of the hydroxyapatite whiskers refines the crystalline particles, giving the polyester network yarn both ultra-fine advantages and good mechanical properties. The hydroxyl groups in the hydroxyapatite whiskers enhance the interfacial connection between PET molecules, promoting mutual attraction and the formation of an ordered and dense crystalline network, thereby further ensuring the strength of the ultra-fine polyester network yarn. Combined with the layered structure of boron nitride and the hydroxyl groups on the surface of the layered boron nitride, the number of crystallization starting points is further increased, lowering the crystallization energy barrier. The layered boron nitride facilitates penetration with PET molecular chains, further guiding the orderly arrangement of molecular chains. With multiple crystallization starting points on the surface of the layered boron nitride and the orderly arrangement of molecular chains, the stability of the crystalline network is improved, enhancing both the strength and elasticity of the polyester network yarn.

[0018] Preferably, the modified hydroxyapatite whiskers are prepared from hydroxyapatite whiskers, polyvinyl alcohol solution and lauramide in a mass ratio of 1:0.1-0.2:0.2-0.3.

[0019] By adopting the above technical solution, the viscosity of the polyvinyl alcohol solution is utilized to facilitate the adhesion of granular lauramide to the surface of hydroxyapatite whiskers. The polyvinyl alcohol solution contains hydroxyl groups, and lauramide contains amide groups, so that lauramide can be stably adhered to the surface of hydroxyapatite whiskers while hydroxyl groups are present.

[0020] In the initial stage of the pre-crystallization process, the hydroxyl groups on the surface of hydroxyapatite whiskers combine with the hydroxyl groups in polyvinyl alcohol to provide more crystallization starting points. Lauramide attracts PET molecular chains to arrange themselves in an orderly manner around the nucleation sites. During the long-term pre-crystallization process, the boiling point of lauramide is around 199℃. Reaching the boiling point of lauramide causes it to gradually be lost. The lauramide sites originally provided space for crystal growth, further promoting the orderly growth of crystal particles on the surface of hydroxyapatite whiskers. This allows the polyester network yarn to still have high strength under ultra-fine conditions, thus exhibiting good mechanical properties.

[0021] Preferably, the hydroxyl-modified boron nitride is prepared from nano-boron nitride, polyethylene glycol ethanol solution and p-hydroxycinnamic acid in a mass ratio of 1:0.1-0.2:0.05-0.1.

[0022] By adopting the above technical solution, the viscosity of the polyethylene glycol solution facilitates the adhesion of p-hydroxycinnamic acid to the surface of nano-boron nitride. The hydroxyl and carboxyl groups in p-hydroxycinnamic acid and the hydroxyl groups in polyethylene glycol further increase crystallization sites, lower the crystallization temperature, and increase the crystallization speed, while simultaneously improving crystallinity and the mechanical properties of the polyester network yarn. Polyethylene glycol also increases the flexibility and impact strength of the polyester network yarn, further enhancing the strength and durability of the ultrafine polyester network yarn. Since p-hydroxycinnamic acid has a melting point of approximately 212℃, it is not easily melted during pre-crystallization. However, it melts at the high temperature of approximately 250℃ during melt spinning, allowing the whiskers to crystallize effectively at different temperatures. This gradually forms crystalline particles while promoting the orderly arrangement of PET molecular chains. The hydroxyl and carboxyl groups attract the molecular chains to contact each other, gradually improving the stability of the crystalline network, thereby further enhancing the mechanical strength of the polyester network yarn prepared by spinning.

[0023] Polyethylene glycol ethanol solution penetrates into the layered structure of boron nitride nanoparticles and adheres to the surface of boron nitride nanoparticles. Hydroxycinnamic acid is soluble in ethanol, which can further improve the hydroxyl and carboxyl content of the boron nitride nanoparticle layer structure and the surface of boron nitride nanoparticles, thereby further increasing the crystallization starting point, promoting the crystallization of polyester network yarn and improving the stability of the crystal network. This gives the polyester network yarn the advantages of being ultra-fine and flat, while also having good mechanical properties.

[0024] Preferably, the water content of the crystal slices in S1 is less than 0.02%, and the crystallinity is 18-22%.

[0025] By adopting the above technical solution, the polyester network yarn has a better crystallization effect, thereby ensuring that the polyester network yarn has high strength and durability.

[0026] Preferably, the melting temperature of the melt spinning in S2 is 250-260℃, the spinneret orifice diameter is 0.32-0.35mm, the length-to-diameter ratio is 6, and the spinneret orifices are arranged in an alternating pattern.

[0027] By adopting the above technical solution, ultra-fine flat polyester network yarns can be produced, which have good elasticity and strength, improving the feel and durability of the finished product.

[0028] Preferably, in S3, the height of the fiber filaments cooled by the ring blowing is controlled at 0.5-0.6 mm, the wind pressure is set at 0.1-0.12 MPa, and the ring blowing cooling is adjusted to 25-27℃.

[0029] Preferably, the airflow velocity of the ring airflow in the S3 ring airflow cooling system is 10-12 m / s.

[0030] By adopting the above technical solutions, ring-blowing cooling can not only effectively reduce the temperature of polyester filaments and prevent them from being damaged by high temperatures, but also ensure the quality and performance of polyester filaments. The ring-blowing method can make the polyester filaments cool evenly and quickly, thereby maintaining their shape stability and mechanical strength. Ring-blowing cooling also helps to improve production efficiency, thereby further improving the production quality and efficiency of polyester network yarn.

[0031] Preferably, the texturing process in S3 uses a POY yarn pre-network with a pre-network pressure of 0.12-0.15 MPa.

[0032] By adopting the above technical solutions and utilizing pre-texturing treatment, the elasticity and resilience of POY yarn are significantly improved, giving the polyester network yarn better tensile properties and resilience, thus improving the durability and comfort of textiles. Pre-texturing treatment also helps to enhance the wrinkle resistance of polyester network yarn, and the textured polyester yarn is softer and fuller, making textiles more attractive in terms of touch and appearance.

[0033] In summary, this application has the following beneficial effects:

[0034] 1. After PET chips are treated with oxygen plasma, the surface roughness of the chips is increased, which facilitates the introduction of polar groups and increases the surface energy of the PET chips. The polar groups and the larger surface area can increase the nucleation points of crystals, promote the orderly arrangement of PET molecular chains, improve the pre-crystallization effect, and make PET crystals more uniform and fine, thereby improving the elasticity and mechanical strength of polyester network yarns.

[0035] 2. Modified hydroxyapatite whiskers and hydroxyl-modified boron nitride are combined. The modified hydroxyapatite whiskers are used as nucleating agents for PET crystallization, which lowers the energy barrier to crystallization and promotes PET crystallization. Furthermore, the spiky whisker penetration effect of hydroxyapatite whiskers can refine the crystal particles, giving the polyester network yarn the advantages of ultrafineness while maintaining good mechanical properties. The hydroxyl groups of hydroxyapatite whiskers can improve the interfacial connection between PET molecules, promoting the mutual attraction of PET molecules to form an ordered and dense crystal network, thereby further ensuring the strength of the ultrafine polyester network yarn.

[0036] 3. The layered structure of boron nitride in hydroxyl-modified boron nitride and the hydroxyl groups on the surface of layered boron nitride further increase the number of crystallization starting points and lower the energy barrier for crystallization. Layered boron nitride facilitates the interpenetration of PET molecular chains, thereby further guiding the orderly arrangement of molecular chains. With multiple crystallization starting points on the surface of layered boron nitride and the orderly arrangement of molecular chains, the stability of the crystal network is improved, which can also improve the strength and elasticity of polyester network yarn.

[0037] 4. Maleic anhydride has a boiling point of approximately 202 degrees Celsius. During melt spinning, maleic anhydride is gradually lost and does not easily affect the final forming effect of the polyester network yarn. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the embodiments.

[0039] All of the following ingredients are commercially available.

[0040] Preparation example of modified hydroxyapatite whiskers

[0041] Preparation Example 1: Modified hydroxyapatite whiskers were prepared using the following method:

[0042] 0.15 kg of polyvinyl alcohol solution was uniformly sprayed onto the surface of 1 kg of hydroxyapatite whiskers, and then 0.25 kg of lauramide was added at a rate of 60 g / min. During the addition process, the stirring speed of the hydroxyapatite whiskers was 120 r / min. The average diameter of the hydroxyapatite whiskers was 10 nm, and the average length of the hydroxyapatite whiskers was 300 nm. The polyvinyl alcohol solution was a 0.5% (w / w) aqueous solution of polyvinyl alcohol. The average particle size of the lauramide was 80 nm. After drying and dispersion until the hydroxyapatite whiskers did not stick together or agglomerate, modified hydroxyapatite whiskers were obtained. The average length of the modified hydroxyapatite whiskers was less than 600 nm.

[0043] Preparation Example 2: The difference between this preparation example and Preparation Example 1 is that:

[0044] 0.1 kg of polyvinyl alcohol solution was uniformly sprayed onto the surface of 1 kg of hydroxyapatite whiskers, and then 0.2 kg of lauramide was added at a rate of 60 g / min. During the addition process, the stirring speed of the hydroxyapatite whiskers was 120 r / min. The average diameter of the hydroxyapatite whiskers was 10 nm. After drying and dispersing until the hydroxyapatite whiskers did not stick together and agglomerate, modified hydroxyapatite whiskers were obtained. The average length of the modified hydroxyapatite whiskers was less than 600 nm.

[0045] Preparation Example 3: The difference between this preparation example and Preparation Example 1 is that:

[0046] 0.2 kg of polyvinyl alcohol solution was uniformly sprayed onto the surface of 1 kg of hydroxyapatite whiskers, and then 0.3 kg of lauramide was added at a rate of 60 g / min. During the addition process, the stirring speed of the hydroxyapatite whiskers was 120 r / min. The average diameter of the hydroxyapatite whiskers was 10 nm. After drying and dispersing until the hydroxyapatite whiskers did not stick together and agglomerate, modified hydroxyapatite whiskers were obtained. The average length of the modified hydroxyapatite whiskers was less than 600 nm.

[0047] Preparation example of hydroxyl-modified boron nitride

[0048] Preparation Example 4: Hydroxyl-modified boron nitride was prepared using the following method:

[0049] 0.15 kg of polyethylene glycol solution was uniformly sprayed onto the surface of 1 kg of boron nitride nanoparticles, and then 0.08 kg of p-hydroxycinnamic acid was added. The average particle size of p-hydroxycinnamic acid was 60 nm, and the average particle size of boron nitride nanoparticles was 200 nm. The polyethylene glycol solution was a 1% (w / w) polyethylene glycol ethanol solution with 99% (w / w) ethanol. After drying and dispersion until the boron nitride nanoparticles did not stick together or agglomerate, hydroxyl-modified boron nitride was obtained. The average particle size of hydroxyl-modified boron nitride was less than 500 nm.

[0050] Preparation Example 5: The difference between this preparation example and Preparation Example 4 is that:

[0051] 0.1 kg of polyethylene glycol solution was uniformly sprayed onto the surface of 1 kg of boron nanoparticles, and then 0.05 kg of p-hydroxycinnamic acid was added. The average particle size of p-hydroxycinnamic acid was 60 nm, and the average particle size of boron nanoparticles was 200 nm. The polyethylene glycol solution was a 1% (w / w) polyethylene glycol ethanol solution. After drying and dispersion until the boron nanoparticles did not stick together or agglomerate, hydroxyl-modified boron nitride was obtained. The average particle size of the hydroxyl-modified boron nitride was less than 500 nm.

[0052] Preparation Example 6: The difference between this preparation example and Preparation Example 4 is that:

[0053] 0.2 kg of polyethylene glycol solution was uniformly sprayed onto the surface of 1 kg of boron nanoparticles, and then 0.1 kg of p-hydroxycinnamic acid was added. The average particle size of p-hydroxycinnamic acid was 60 nm, and the average particle size of boron nanoparticles was 200 nm. The polyethylene glycol solution was a 1% (w / w) polyethylene glycol ethanol solution. After drying and dispersion until the boron nanoparticles did not stick together and agglomerate, hydroxyl-modified boron nitride was obtained. The average particle size of hydroxyl-modified boron nitride was less than 500 nm.

[0054] Example of preparation of maleic anhydride coated whiskers

[0055] Preparation Example 7: Maleic anhydride coated whiskers were prepared using the following method:

[0056] 1 kg of the modified hydroxyapatite whiskers prepared in Preparation Example 1 and 1 kg of the hydroxyl-modified boron nitride prepared in Preparation Example 4 were mixed and stirred evenly to obtain nano-whisker material.

[0057] Maleic anhydride is heated to 60°C and completely melted to obtain a maleic anhydride melt.

[0058] 1 kg of maleic anhydride melt was uniformly sprayed onto the surface of 2 kg of nano-whiskers, and then dried and dispersed until the nano-whiskers did not stick together or agglomerate, thus obtaining maleic anhydride-coated whiskers with an average particle size of less than 1 μm.

[0059] Preparation Example 8: The difference between this preparation example and Preparation Example 7 is that:

[0060] 1 kg of the modified hydroxyapatite whiskers prepared in Preparation Example 2 and 0.5 kg of the hydroxyl-modified boron nitride prepared in Preparation Example 5 were mixed and stirred evenly to obtain nano-whisker material.

[0061] 1 kg of maleic anhydride melt was uniformly sprayed onto the surface of 1.5 kg of nano-whiskers, and then dried and dispersed until the nano-whiskers did not stick together or agglomerate, thus obtaining maleic anhydride-coated whiskers with an average particle size of less than 1 μm.

[0062] Preparation Example 9: The difference between this preparation example and Preparation Example 7 is that:

[0063] 1 kg of the modified hydroxyapatite whiskers prepared in Preparation Example 3 and 2 kg of the hydroxyl-modified boron nitride prepared in Preparation Example 6 were mixed and stirred evenly to obtain nano-whisker material.

[0064] 1 kg of maleic anhydride melt was uniformly sprayed onto the surface of 3 kg of nano-whiskers, and then dried and dispersed until the nano-whiskers did not stick together or agglomerate, thus obtaining maleic anhydride-coated whiskers with an average particle size of less than 1 μm.

[0065] Example

[0066] Example 1: Processing technology of a colored ultrafine flat elastic polyester network yarn:

[0067] S1. PET slices were subjected to oxygen plasma treatment for 30 seconds at an oxygen flow rate of 700 mL / min. Then, maleic anhydride-coated nanocrystals were sprayed onto the slices at 65°C with a mass ratio of 1:0.1. The temperature was gradually increased to 210°C for pre-crystallization for 24 hours, and then dried at 160°C to obtain crystalline slices. The water content of the crystalline slices was less than 0.02%, and the crystallinity was 20%.

[0068] S2. Crystallized slices are melt-spun. The melting temperature during melt spinning is 250℃. The spinneret has an orifice diameter of 0.32mm and an aspect ratio of 6. The spinneret orifices are arranged in an alternating pattern to obtain fiber filaments.

[0069] S3. The fiber filaments are cooled by ring blowing. During the ring blowing cooling process, the fiber filament height is controlled at 0.5mm, the air pressure is set at 0.1MPa, the ring blowing speed is 10m / s, and the ring blowing cooling temperature is adjusted to 25℃. Then, the spinning oiling rack is used, and a two-way independent oil supply system is adopted to ensure that the surface of each flat filament is evenly covered. Finally, POY filament pre-networking is introduced, the pre-networking pressure is 0.12MPa, the PU disk configuration is adjusted to 1-5-1, and texturing treatment is performed to obtain the finished polyester network filament with an average diameter of 1μm.

[0070] Example 2: The difference between this example and Example 1 is that:

[0071] S1. PET slices were subjected to oxygen plasma treatment for 30 seconds at an oxygen flow rate of 700 mL / min. Then, maleic anhydride-coated nanocrystals were sprayed at 60°C with a mass ratio of PET slices to maleic anhydride-coated nanocrystals of 1:0.1. The temperature was gradually increased to 200°C for pre-crystallization for 28 hours, and then dried at 155°C to obtain crystalline slices. The water content of the crystalline slices was less than 0.02%, and the crystallinity was 18%.

[0072] S2. Crystallized slices are melt-spun. The melting temperature during melt spinning is 250℃. The spinneret has an orifice diameter of 0.32mm and an aspect ratio of 6. The spinneret orifices are arranged in an alternating pattern to obtain fiber filaments.

[0073] S3. The fiber filaments are cooled by ring blowing. During the ring blowing cooling process, the fiber filament height is controlled at 0.5mm, the air pressure is set at 0.1MPa, the ring blowing speed is 10m / s, and the ring blowing cooling temperature is adjusted to 25℃. Then, the spinning is applied to the oiling rack, using a two-way independent oil supply system to ensure that the surface of each flat filament is evenly covered. Finally, POY filament pre-networking is introduced, with a pre-networking pressure of 0.12MPa, for texturing treatment to obtain the finished polyester network filament.

[0074] Example 3: The difference between this example and Example 1 is that:

[0075] S1. PET slices were subjected to oxygen plasma treatment for 30 seconds at an oxygen flow rate of 700 mL / min. Then, maleic anhydride-coated nanocrystals were sprayed at 70°C with a mass ratio of PET slices to maleic anhydride-coated nanocrystals of 1:0.1. The temperature was gradually increased to 210°C for pre-crystallization for 24 hours, and then dried at 165°C to obtain crystalline slices. The water content of the crystalline slices was less than 0.02%, and the crystallinity was 22%.

[0076] S2. Crystallized slices are melt-spun. The melting temperature during melt spinning is 260℃. The spinneret has an orifice diameter of 0.35mm and an aspect ratio of 6. The spinneret orifices are arranged in an alternating pattern to obtain fiber filaments.

[0077] S3. The fiber filaments are cooled by ring blowing. During the ring blowing cooling process, the fiber filament height is controlled at 0.6mm, the air pressure is set at 0.12MPa, the ring blowing speed is 12m / s, and the ring blowing cooling temperature is adjusted to 27℃. Then, the spinning is applied to the oiling rack, using a two-way independent oil supply system to ensure that the surface of each flat filament is evenly covered. Finally, POY filament pre-networking is introduced, with a pre-networking pressure of 0.15MPa, for texturing treatment to obtain the finished polyester network filament.

[0078] Example 4: The difference between this example and Example 1 is that:

[0079] The nano-whisker material is silicon dioxide whiskers, with an average length of 1μm and an average diameter of 20nm.

[0080] Example 5: The difference between this example and Example 1 is that:

[0081] In the nano-whisker material, the modified hydroxyapatite whiskers are replaced with an equal mass of hydroxyapatite whiskers, and the hydroxyl-modified boron nitride is replaced with an equal mass of boron nitride.

[0082] Example 6: The difference between this example and Example 1 is that:

[0083] No lauramide was added during the preparation of the modified hydroxyapatite whiskers.

[0084] Example 7: The difference between this example and Example 1 is that:

[0085] No p-hydroxycinnamic acid was added during the preparation of hydroxylated modified boron nitride.

[0086] Comparative Example

[0087] Comparative Example 1: The difference between this comparative example and Example 1 is that:

[0088] The S1 process does not involve oxygen plasma treatment.

[0089] Comparative Example 2: This comparative example differs from Example 1 in that:

[0090] Maleic anhydride-coated whiskers were not added during the S1 process.

[0091] Performance testing

[0092] 1. Staining effect detection

[0093] Polyester network yarns were prepared using the methods described in Examples 1-3, and the dyeing rate was tested and recorded in accordance with GB / T9337-2009.

[0094] 2. Mechanical performance testing

[0095] Polyester network yarns were prepared using the methods of Examples 1-7 and Comparative Examples 1-2, respectively. The breaking strength, breaking elongation and CV value were tested according to GB / T14460-2001, and the data were recorded.

[0096] Table 1 Performance Test Table (In the table, " / " indicates that the corresponding embodiment or comparative example did not test this item, so there is no data)

[0097]

[0098] As can be seen from Examples 1-3 and Table 1, the polyester network yarn prepared in this application has a high dyeing rate, high breaking strength, low breaking elongation, and low CV value; indicating that the polyester network yarn has a good dyeing effect, and under ultra-fine conditions, it has good strength and elasticity, which can extend the durability and service life of polyester fiber yarn.

[0099] Combining Examples 1 and 4-7 with Table 1, it can be seen that the nanofiber material in Example 4 is silica whisker, with an average length of 1 μm and an average diameter of 20 nm. Compared with Example 1, the polyester network yarn prepared in Example 4 has a lower breaking strength than that in Example 1. This indicates that silica whiskers not only lack a layered structure, but also lack polar groups on their surface, which can easily affect the crystallization effect of the polyester network yarn, thereby affecting the strength of the polyester network yarn.

[0100] In Example 5, the modified hydroxyapatite whiskers were replaced with an equal mass of hydroxyapatite whiskers, and the hydroxy-modified boron nitride was replaced with an equal mass of boron nitride. Compared with Example 1, the polyester network yarn prepared in Example 5 had a lower breaking strength than that in Example 1. This indicates that the hydroxy-modified nanowhiskers can enrich the crystallization sites of PET chips, promote PET crystallization, improve the stability and order of the crystallization network, and thus improve the strength of the polyester network yarn.

[0101] In Example 6, no lauramide was added during the preparation of modified hydroxyapatite whiskers. Compared with Example 1, the polyester network yarn prepared in Example 6 had a lower breaking strength than that in Example 1. This indicates that the addition of lauramide promotes the orderly arrangement of molecular chains in the early stage of crystallization. Under high temperature conditions, lauramide is gradually lost, ensuring the stability and density of the internal crystal network of the polyester network yarn, thereby improving the strength and durability of the ultrafine polyester network yarn.

[0102] In Example 7, no p-hydroxycinnamic acid was added during the preparation of hydroxy-modified boron nitride. Compared with Example 1, the breaking strength of the polyester network yarn prepared in Example 7 was lower than that in Example 1. This indicates that p-hydroxycinnamic acid can increase the crystallization sites of the polyester network yarn, thereby promoting the formation of a stable crystal network and improving the strength of the polyester network yarn.

[0103] Combining Example 1 and Comparative Examples 1-2 with Table 1, it can be seen that Comparative Example 1S1 did not undergo oxygen plasma treatment. Compared with Example 1, the polyester network yarn prepared in Comparative Example 1 has a lower breaking strength. This indicates that oxygen plasma treatment increases the surface roughness of the chips while facilitating the introduction of polar groups, increasing the surface energy of the PET chips, increasing crystallization sites, and promoting the orderly arrangement of PET molecular chains, thereby crystallizing and improving the crystallization effect. It can also make the PET crystals more uniform and fine, and improve the elasticity and mechanical strength of the polyester network yarn.

[0104] In Comparative Example 2S1, no maleic anhydride-coated whisker material was added. Compared to Example 1, the polyester network yarn prepared in Comparative Example 2 had a lower breaking strength. This indicates that during the pre-crystallization process, whiskers on the surface of PET chips can be introduced and intercalated into the polyester molecular chains. Using whiskers as nuclei for crystallization promotes the orderly arrangement of PET molecular chains, thereby promoting the formation of a crystalline network. Furthermore, the intercalation effect of whiskers can refine the crystal size of the polyester network yarn, allowing the ultrafine polyester network yarn to still have good mechanical properties. It can also improve the flexibility and abrasion resistance of the polyester network yarn. At the same time, nano-sized whiskers can reduce the activation energy of polyester network yarn crystallization, accelerate the crystallization process, and increase interfacial strength and durability.

[0105] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A process for the production of colored ultra-fine flat elastic polyester network yarns, characterized in that, Includes the following steps: S1. The PET slices are treated with oxygen plasma, and then maleic anhydride-coated nanocrystals are added at 60-70℃. The temperature is gradually increased to 200-210℃ for pre-crystallization for 24-28 hours, and then dried at 155-165℃ to obtain crystalline slices. S2. Crystallized slices are melt-spun to obtain fiber filaments; S3. The fiber filaments are cooled by a ring blower, spun onto an oiling rack, and texturized to obtain the finished polyester network yarn.

2. The process for processing colored ultrafine flat elastic polyester network yarn as claimed in claim 1, wherein: The maleic anhydride-coated nanocrystals are prepared by mixing maleic anhydride melt and nanocrystal material in a mass ratio of 1:1.5-3.

3. The process for processing colored ultrafine flat elastic polyester network yarn according to claim 2, characterized in that, The nanocrystal material is composed of modified hydroxyapatite whiskers and hydroxyl-modified boron nitride in a mass ratio of 1:0.5-2.

4. The process for processing colored ultrafine flat elastic polyester network yarn according to claim 3, characterized in that, The modified hydroxyapatite whiskers are prepared by mixing hydroxyapatite whiskers, polyvinyl alcohol solution and lauramide in a mass ratio of 1:0.1-0.2:0.2-0.

3.

5. The processing technology for a colored ultrafine flat elastic polyester network yarn according to claim 3, characterized in that, The hydroxyl-modified boron nitride was prepared by mixing nano-boron nitride, polyethylene glycol ethanol solution, and p-hydroxycinnamic acid in a mass ratio of 1:0.1-0.2:0.05-0.

1.

6. The processing technology of a colored ultrafine flat elastic polyester network yarn according to claim 1, characterized in that, The water content of the crystal slices in S1 is less than 0.02%, and the crystallinity is 18-22%.

7. The processing technology for a colored ultrafine flat elastic polyester network yarn according to claim 1, characterized in that, The melting temperature of the melt spinning in S2 is 250-260℃, the spinneret orifice diameter is 0.32-0.35mm, the length-to-diameter ratio is 6, and the spinneret orifices are arranged in an alternating pattern.

8. The processing technology of a colored ultrafine flat elastic polyester network yarn according to claim 1, characterized in that, In S3, the height of the fiber filaments cooled by the ring blowing is controlled at 0.5-0.6 mm, the air pressure is set at 0.1-0.12 MPa, and the ring blowing cooling is adjusted to 25-27℃.

9. The processing technology for a colored ultrafine flat elastic polyester network yarn according to claim 1, characterized in that, The airflow velocity of the ring-shaped cooling ring in S3 is 10-12 m / s.

10. The processing technology of a colored ultrafine flat elastic polyester network yarn according to claim 1, characterized in that, The texturing process in S3 uses POY yarn pre-network, and the pre-network pressure is 0.12-0.15MPa.

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