Processing technology of colored superfine flat elastic polyester interlaced yarn

Abstract

The invention relates to the field of fiber processing, and particularly discloses a processing technology of colored superfine flat elastic polyester interlaced yarn, which comprises the following steps: S1, carrying out oxygen plasma treatment on PET (polyethylene terephthalate) slices, then adding maleic anhydride coated nano whiskers at 60-70 DEG C, gradually heating to 200-210 DEG C, pre-crystallizing for 24-28 hours, and then drying at 155-165 DEG C, so as to obtain the colored superfine flat elastic polyester interlaced yarn; crystallization slices are obtained; s2, performing melt spinning on the crystal slices to obtain cellosilk; s3, performing circular blowing cooling, spinning on an oil frame and elasticizing treatment on the cellosilk to obtain a finished product terylene interlaced yarn; meanwhile, the super-fine fiber has the advantages of being good in dyeing effect, stable in color and luster, super-fine, high in strength, good in elasticity, easy in flatness control and good in stability.

Description

Technical Field

[0001] The present application relates to the field of fiber processing, and more specifically, it relates to a processing technology for colored ultra-fine flat elastic polyester network yarns. Background Art

[0002] Polyester network yarn is a kind of network yarn prepared from polyester fibers, which is generally applied in fields such as clothing, industry, and textile industry; polyester network yarn not only has excellent elasticity, but also is not easy to deform. At the same time, polyester network yarn has low hygroscopicity and also has good abrasion resistance, heat resistance, and corrosion resistance.

[0003] However, the dyeing uniformity of polyester network yarn is not good, and problems such as unstable color are likely to occur. Moreover, when polyester network yarn wants to reach an ultra-fine form, its strength is likely to decrease, and at the same time, the flatness is difficult to control and the stability is not good.

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

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

[0006] A processing technology for colored ultra-fine flat elastic polyester network yarns provided by the present application adopts the following technical scheme: A processing technology for colored ultra-fine flat elastic polyester network yarns includes the following steps: S1. Subject the PET chips to oxygen plasma treatment, then add maleic anhydride-coated nanocrystalline whiskers at 60 - 70°C, gradually raise the temperature to 200 - 210°C for pre-crystallization for 24 - 28 h, and then dry at 155 - 165°C to obtain crystallized chips; S2. Melt-spin the crystallized chips to obtain fiber filaments; S3. Cool the fiber filaments by ring blowing, pass them through a spinning oiling rack, and perform texturing treatment to obtain finished polyester network yarns.

[0007] By adopting the above technical scheme, after the PET chips are subjected to oxygen plasma treatment, while increasing the surface roughness of the chips, it is convenient to introduce polar groups, increase the surface energy of the PET chips, and 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 can also make the PET crystallization more uniform and fine, improving the elasticity and mechanical strength of the polyester network yarns.

[0008] After the PET chips are treated with oxygen plasma, maleic anhydride is melted and adhered at 60-70 °C to generate viscosity, so that the surface of the PET chips is loaded with maleic anhydride-coated nanowhiskers. At 200-210 °C, maleic anhydride reaches its boiling point and gradually volatilizes. During the pre-crystallization process, the nanowhiskers are on the surface of the PET chips. The introduction of the nanowhiskers can be inserted into the polyester molecular chains. Using the nanowhiskers as the crystallization nucleation points can promote the orderly arrangement of the PET molecular chains, thereby promoting the formation of the crystallization network. Moreover, the intercalation effect of the nanowhiskers can refine the crystallization size of the polyester network filaments, so that the ultra-fine polyester network filaments still have good mechanical properties, and can also improve the flexibility and wear resistance of the polyester network filaments. At the same time, the nanoscale nanowhiskers can reduce the activation energy of the crystallization of the polyester network filaments, accelerate the crystallization process, and increase the interfacial strength and durability.

[0009] By limiting the drying temperature, it is ensured that the PET chips form a more stable crystal structure after pre-crystallization, ensuring the dimensional stability and crystallization stability, so as to ensure that the polyester network filaments have good mechanical properties.

[0010] The crystallized chips are subjected to melt spinning, ring blowing cooling, oiling on the spinning frame, and texturing treatment, making the polyester network filaments easy to dye. While improving the dyeing uptake effect and dyeing uniformity, it can also balance the color. The prepared ultra-fine fiber filaments still have high strength and good elasticity, and have uniform flatness and good stability.

[0011] Preferably, the maleic anhydride-coated nanowhiskers are prepared from a maleic anhydride solution and a nanowhisker material with a mass ratio of 1:1.5-3.

[0012] By adopting the above technical solution, using the viscosity of the maleic anhydride solution, it is easy to adhere to the surface of the nanowhisker material. The maleic anhydride solution can promote the attachment of the nanowhisker material to the surface of the PET chips. During the pre-crystallization process, the nanowhisker material can increase the interfacial area and crystallization nucleation points, promote the orderly arrangement of the PET chip molecular chains, form a certain crystallization network, and help improve the mechanical properties and dimensional stability of the PET; and heating at 200-210 °C for 24-28 h, maleic anhydride gradually thermally decomposes and is not likely to stay in the polyester network filaments to affect their performance, ensuring the crystallization effect of the polyester network filaments.

[0013] Preferably, the nanowhisker material is composed of modified hydroxyapatite whiskers and hydroxy-modified boron nitride with a mass ratio of 1:0.5-2.

[0014] By adopting the above technical solution, the modified hydroxyapatite whiskers and hydroxy-modified boron nitride are combined. The modified hydroxyapatite whiskers are used as the nucleating agent for PET crystallization, reducing the energy barrier of crystallization, promoting PET crystallization, and the interpenetrating effect of the spiky whiskers of hydroxyapatite whiskers can refine the crystal grains, enabling the polyester network yarn to have the advantages of super fineness and good mechanical properties while the hydroxy groups of the hydroxyapatite whiskers can improve the interfacial connection effect between PET molecules, promoting the mutual attraction of PET molecules to form an ordered and dense crystallization network, thereby further ensuring the strength of the superfine polyester network yarn; combined with the layered structure of boron nitride in the hydroxy-modified boron nitride and the hydroxy groups on the surface of the layered boron nitride, the number of crystallization starting points is further increased, the energy barrier of crystallization is reduced, and the layered boron nitride is convenient for interpenetrating with the PET molecular chain, thereby further guiding the ordered arrangement of the molecular chain. With multiple crystallization starting points on the surface of the layered boron nitride and the ordered arrangement of the molecular chain, while improving the stability of the crystallization network, the strength and elasticity of the polyester network yarn can be improved.

[0015] Preferably, the modified hydroxyapatite whiskers are prepared from hydroxyapatite whiskers, polyvinyl alcohol solution and lauramide with a mass ratio of 1:0.1 - 0.2:0.2 - 0.3.

[0016] 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 the hydroxyapatite whiskers. The polyvinyl alcohol solution contains hydroxy groups and lauramide contains amide groups, enabling the hydroxyapatite whiskers to stably adhere to the surface while having hydroxy groups.

[0017] In the initial stage of temperature rise during the pre-crystallization process, the hydroxy groups on the surface of the hydroxyapatite whiskers cooperate with the hydroxy groups in the polyvinyl alcohol to provide more crystallization starting points for crystallization. Lauramide attracts the PET molecular chains to be orderly arranged around the nucleation sites. During the long-term pre-crystallization process, the boiling point of lauramide is about 199 °C. When the boiling point of lauramide is reached, lauramide gradually loses. The original lauramide sites provide space for crystal growth, further promoting the orderly growth of the crystal grains on the surface of the hydroxyapatite whiskers, enabling the superfine polyester network yarn to still have high strength under the condition of super fineness, and thus having good mechanical properties.

[0018] Preferably, the hydroxy-modified boron nitride is prepared from nano-boron nitride, polyethylene glycol ethanol solution and p-hydroxycinnamic acid with a mass ratio of 1:0.1 - 0.2:0.05 - 0.1.

[0019] By adopting the above technical solutions, taking advantage of the viscosity of the polyethylene glycol solution, it is convenient to adhere p-hydroxycinnamic acid to the surface of nano-boron nitride. By using the hydroxyl groups and carboxyl groups in p-hydroxycinnamic acid and the hydroxyl groups in polyethylene glycol, the crystallization sites are further increased, the crystallization temperature is reduced, the crystallization speed is increased, and the crystallinity and the mechanical properties of the polyester network yarn are improved at the same time. Polyethylene glycol can also increase the flexibility and impact strength of the polyester network yarn, and further improve the strength and durability of the superfine polyester network yarn. The melting point of p-hydroxycinnamic acid is about 212 °C, and it is not easily melted during the pre-crystallization process, but is melted under the high temperature condition of about 250 °C during melt spinning, so that the whisker material has good crystallization effect at different temperatures. While gradually forming crystal grains, it promotes the orderly arrangement of PET molecular chains, uses hydroxyl groups and carboxyl groups to attract molecular chains to contact each other, and gradually improves the stability of the crystallization network, thereby further improving the mechanical strength of the polyester network yarn prepared by spinning.

[0020] The polyethylene glycol ethanol solution penetrates into the layered structure of nano-boron nitride and adheres to the surface of nano-boron nitride. p-Hydroxycinnamic acid dissolves in ethanol, which can further increase the content of hydroxyl groups and carboxyl groups on the nano-boron nitride layer structure and the surface of nano-boron nitride, thereby further increasing the crystallization starting point, promoting the crystallization of the polyester network yarn and improving the stability of the crystallization network at the same time, so that the polyester network yarn has the advantages of superfine and flat while having good mechanical properties.

[0021] Preferably, the moisture content of the crystallization chips in S1 is lower than 0.02%, and the crystallinity is 18-22%.

[0022] By adopting the above technical solutions, the polyester network yarn has a good crystallization effect, thereby ensuring that the polyester network yarn has high strength and durability.

[0023] Preferably, the melting temperature of the melt spinning in S2 is 250-260 °C, the pore diameter of the spinneret for spinning is 0.32-0.35 mm, the length-diameter ratio is 6, and the spinneret holes are arranged in a staggered layout.

[0024] By adopting the above technical solutions, superfine and flat polyester network yarn can be prepared, and it has good elasticity and strength, improving the hand feeling and durability of the finished product.

[0025] Preferably, the height of the fiber filament cooled by the ring blower in S3 is controlled at 0.5-0.6 mm, the air pressure is set at 0.1-0.12 MPa, and the ring blower cooling is adjusted to 25-27 °C.

[0026] Preferably, the ring blower air speed in the ring blower cooling in S3 is 10-12 m / s.

[0027] By adopting the above technical solutions, the ring blowing cooling can not only effectively reduce the temperature of the polyester filament, avoid its damage due to high temperature, but also ensure the quality and performance of the polyester filament; through the surrounding blowing method, the polyester filament can be cooled evenly and rapidly, so as to maintain the shape stability and mechanical strength; the ring blowing cooling is also helpful to improve the production efficiency, thereby further improving the production quality and efficiency of the polyester network filament.

[0028] Preferably, in the S3, the texturing treatment adopts POY yarn pre-networking, and the pre-networking pressure is 0.12 - 0.15 MPa.

[0029] By adopting the above technical solutions, through the pre-networking texturing treatment, the elasticity and resilience of the POY yarn are significantly improved, so that the polyester network filament has good tensile properties and resilience, improving the durability and comfort of the textile; the pre-networking texturing treatment is also helpful to enhance the wrinkle resistance of the polyester network filament, and the polyester filament after the texturing treatment is softer and plumper, making the textile more attractive in touch and appearance.

[0030] In summary, the present application has the following beneficial effects: 1. After the PET chips are treated by oxygen plasma, while increasing the surface roughness of the chips, it is convenient to introduce polar groups, increase 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 the PET molecular chains, improve the pre-crystallization effect, and can also make the PET crystallization more uniform and fine, improving the elasticity and mechanical strength of the polyester network filament.

[0031] 2. The modified hydroxyapatite whiskers and the hydroxy-modified boron nitride cooperate with each other. Using the modified hydroxyapatite whiskers as the nucleating agent for PET crystallization, it reduces the energy barrier of crystallization, promotes PET crystallization, and the spiky whisker interpenetration effect of the hydroxyapatite whiskers can refine the crystallization particles, enabling the polyester network filament to have the advantages of ultrafine and good mechanical properties while the hydroxy group of the hydroxyapatite whiskers can improve the interfacial connection effect between PET molecules, promoting the mutual attraction of PET molecules to form an orderly and dense crystallization network, thereby further ensuring the strength of the ultrafine polyester network filament.

[0032] 3. The layered structure of boron nitride in the hydroxy-modified boron nitride and the hydroxy groups on the surface of the layered boron nitride further increase the number of crystallization starting points, reduce the energy barrier of crystallization, and the layered boron nitride is convenient for interpenetrating with the PET molecular chains, thereby further guiding the orderly arrangement of the molecular chains. While there are multiple crystallization starting points on the surface of the layered boron nitride, the molecular chains are orderly arranged, improving the stability of the crystallization network while being able to improve the strength and elasticity of the polyester network filament.

[0033] 4. The boiling point of maleic anhydride is about 202 degrees Celsius. During the melt spinning process, maleic anhydride gradually loses and is not likely to affect the forming effect of the final polyester network filament. Detailed implementation manners

[0034] The following further elaborates on this application in conjunction with embodiments.

[0035] The following raw materials are all commercially available.

[0036] Preparation examples of modified hydroxyapatite whiskers Preparation example 1: The modified hydroxyapatite whiskers are prepared by the following method: Spray 0.15 kg of polyvinyl alcohol solution evenly on the surface of 1 kg of hydroxyapatite whiskers, then add 0.25 kg of lauroylamide at an addition rate of 60 g / min. During the addition process, the stirring speed of the hydroxyapatite whiskers is 120 r / min. The average diameter of the hydroxyapatite whiskers is 10 nm, and the average length is 300 nm. The polyvinyl alcohol solution is an aqueous solution of polyvinyl alcohol with a mass fraction of 0.5%. The average particle size of lauroylamide is 80 nm. After drying and dispersing until the hydroxyapatite whiskers do not adhere and agglomerate with each other, modified hydroxyapatite whiskers are obtained, and the average length of the modified hydroxyapatite whiskers is less than 600 nm.

[0037] Preparation example 2: The difference between this preparation example and preparation example 1 is as follows: Spray 0.1 kg of polyvinyl alcohol solution evenly on the surface of 1 kg of hydroxyapatite whiskers, then add 0.2 kg of lauroylamide at an addition rate of 60 g / min. During the addition process, the stirring speed of the hydroxyapatite whiskers is 120 r / min. The average diameter of the hydroxyapatite whiskers is 10 nm. After drying and dispersing until the hydroxyapatite whiskers do not adhere and agglomerate with each other, modified hydroxyapatite whiskers are obtained, and the average length of the modified hydroxyapatite whiskers is less than 600 nm.

[0038] Preparation example 3: The difference between this preparation example and preparation example 1 is as follows: Spray 0.2 kg of polyvinyl alcohol solution evenly on the surface of 1 kg of hydroxyapatite whiskers, then add 0.3 kg of lauroylamide at an addition rate of 60 g / min. During the addition process, the stirring speed of the hydroxyapatite whiskers is 120 r / min. The average diameter of the hydroxyapatite whiskers is 10 nm. After drying and dispersing until the hydroxyapatite whiskers do not adhere and agglomerate with each other, modified hydroxyapatite whiskers are obtained, and the average length of the modified hydroxyapatite whiskers is less than 600 nm.

[0039] Preparation examples of hydroxyl-modified boron nitride Preparation example 4: The hydroxyl-modified boron nitride is prepared by the following method: 0.15 kg of polyethylene glycol solution was evenly sprayed on the surface of 1 kg of nano boron nitride, 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 nano boron nitride was 200 nm. The polyethylene glycol solution was a polyethylene glycol ethanol solution with a mass fraction of 1%, and the mass fraction of ethanol was 99%. After drying and dispersing until the nano boron nitride was not adhered and agglomerated, hydroxy-modified boron nitride was obtained, and the average particle size of the hydroxy-modified boron nitride was less than 500 nm.

[0040] Preparation Example 5: The difference between this preparation example and Preparation Example 4 is that: 0.1 kg of polyethylene glycol solution was evenly sprayed on the surface of 1 kg of nano boron nitride, 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 nano boron nitride was 200 nm. The polyethylene glycol solution was a polyethylene glycol ethanol solution with a mass fraction of 1%. After drying and dispersing until the nano boron nitride was not adhered and agglomerated, hydroxy-modified boron nitride was obtained, and the average particle size of the hydroxy-modified boron nitride was less than 500 nm.

[0041] Preparation Example 6: The difference between this preparation example and Preparation Example 4 is that: 0.2 kg of polyethylene glycol solution was evenly sprayed on the surface of 1 kg of nano boron nitride, 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 nano boron nitride was 200 nm. The polyethylene glycol solution was a polyethylene glycol ethanol solution with a mass fraction of 1%. After drying and dispersing until the nano boron nitride was not adhered and agglomerated, hydroxy-modified boron nitride was obtained, and the average particle size of the hydroxy-modified boron nitride was less than 500 nm.

[0042] Preparation Example of Maleic Anhydride-Coated Whisker Material Preparation Example 7: The maleic anhydride-coated whisker material was prepared by the following method: 1 kg of the modified hydroxyapatite whiskers prepared in Preparation Example 1 and 1 kg of the hydroxy-modified boron nitride prepared in Preparation Example 4 were mixed and stirred evenly to obtain a nano-whisker material; Maleic anhydride was heated to 60 °C and completely melted to obtain a maleic anhydride melt; 1 kg of the maleic anhydride melt was evenly sprayed on the surface of 2 kg of the nano-whisker material, and then after drying and dispersing until the nano-whisker material was not adhered and agglomerated, a maleic anhydride-coated whisker material was obtained, and the average particle size of the maleic anhydride-coated whisker material was less than 1 μm.

[0043] Preparation Example 8: The difference between this preparation example and Preparation Example 7 is that: 1 kg of the modified hydroxyapatite whiskers prepared in Preparation Example 2 and 0.5 kg of the hydroxy-modified boron nitride prepared in Preparation Example 5 were mixed and stirred evenly to obtain a nano-whisker material; Spray 1 kg of maleic anhydride solution evenly on the surface of 1.5 kg of nanowhisker material, and then dry and disperse it until the nanowhisker materials do not stick to each other and agglomerate, obtaining maleic anhydride-coated whisker material. The average particle size of the maleic anhydride-coated whisker material is less than 1 μm.

[0044] Preparation Example 9: The difference between this preparation example and Preparation Example 7 is as follows: Mix 1 kg of modified hydroxyapatite whiskers prepared in Preparation Example 3 and 2 kg of hydroxy-modified boron nitride prepared in Preparation Example 6 and stir evenly to obtain nanowhisker material; Spray 1 kg of maleic anhydride solution evenly on the surface of 3 kg of nanowhisker material, and then dry and disperse it until the nanowhisker materials do not stick to each other and agglomerate, obtaining maleic anhydride-coated whisker material. The average particle size of the maleic anhydride-coated whisker material is less than 1 μm. Example

[0045] Example 1: A processing technology for colored superfine flat elastic polyester textured yarn: S1. Treat the PET chips with oxygen plasma for 30 s, with an oxygen flow rate of 700 mL / min; then spray maleic anhydride-coated nanowhiskers at 65 °C. The mass ratio of PET chips to maleic anhydride-coated nanowhiskers is 1:0.1. Gradually raise the temperature to 210 °C for pre-crystallization for 24 h, and then dry at 160 °C to obtain crystallized chips; the moisture content of the crystallized chips is less than 0.02%, and the crystallinity is 20%; S2. The crystallized chips are melt-spun. During the melt-spinning process, the melting temperature is 250 °C, the pore diameter of the spinneret for spinning is 0.32 mm, the length-diameter ratio is 6, and the spinneret holes are arranged in a staggered layout to obtain fiber filaments; S3. The fiber filaments are cooled by ring blowing. During the ring blowing cooling process, the height of the fiber filaments is controlled at 0.5 mm, the wind pressure is set at 0.1 MPa, the ring blowing wind speed is 10 m / s, and the ring blowing cooling is adjusted to 25 °C; then it is led to the spinning oiling rack, and a two-way independent oil supply system is adopted to ensure uniform coverage on the surface of each flat silk strand; finally, it is introduced into the POY yarn pre-network, the pre-network pressure is 0.12 MPa, the PU disk configuration is adjusted to 1-5-1, and texturing treatment is carried out to obtain the finished polyester textured yarn, and the average diameter of the polyester textured yarn is 1 μm.

[0046] Example 2: The difference between this example and Example 1 is as follows: S1. Treat the PET chips with oxygen plasma for 30 s, with an oxygen flow rate of 700 mL / min; then spray maleic anhydride-coated nanowhiskers at 60 °C. The mass ratio of PET chips to maleic anhydride-coated nanowhiskers is 1:0.1. Gradually raise the temperature to 200 °C for pre-crystallization for 28 h, and then dry at 155 °C to obtain crystallized chips; the moisture content of the crystallized chips is less than 0.02%, and the crystallinity is 18%; S2. The crystalline slices are melt-spun. During the melt-spinning process, the melting temperature is 250 °C, the aperture of the spinneret for spinning is 0.32 mm, the length-diameter ratio is 6, and the spinneret holes are arranged in a staggered layout to obtain fiber filaments. S3. The fiber filaments are cooled by ring blowing. During the ring blowing cooling process, the height of the fiber filaments is controlled at 0.5 mm, the wind pressure is set at 0.1 MPa, the ring blowing speed is 10 m / s, and the ring blowing cooling is adjusted to 25 °C. Then, it is sent to the spinning oiling rack, and a two-way independent oil supply system is adopted to ensure uniform coverage on the surface of each flat filament. Finally, a POY yarn pre-network is introduced, the pre-network pressure is 0.12 MPa, and texturing treatment is carried out to obtain the finished polyester network yarn.

[0047] Example 3: The difference between this example and Example 1 is as follows: S1. The PET slices are treated with oxygen plasma for 30 s, and the oxygen flow rate is 700 mL / min. Then, maleic anhydride-coated nanowhiskers are sprayed at 70 °C. The mass ratio of PET slices to maleic anhydride-coated nanowhiskers is 1:0.1. It is gradually heated to 210 °C for pre-crystallization for 24 h, and then dried at 165 °C to obtain crystalline slices. The moisture content of the crystalline slices is less than 0.02%, and the crystallinity is 22%. S2. The crystalline slices are melt-spun. During the melt-spinning process, the melting temperature is 260 °C, the aperture of the spinneret for spinning is 0.35 mm, the length-diameter ratio is 6, and the spinneret holes are arranged in a staggered layout to obtain fiber filaments. S3. The fiber filaments are cooled by ring blowing. During the ring blowing cooling process, the height of the fiber filaments is controlled at 0.6 mm, the wind pressure is set at 0.12 MPa, the ring blowing speed is 12 m / s, and the ring blowing cooling is adjusted to 27 °C. Then, it is sent to the spinning oiling rack, and a two-way independent oil supply system is adopted to ensure uniform coverage on the surface of each flat filament. Finally, a POY yarn pre-network is introduced, the pre-network pressure is 0.15 MPa, and texturing treatment is carried out to obtain the finished polyester network yarn.

[0048] Example 4: The difference between this example and Example 1 is as follows: The nanowhisker material is silicon dioxide whiskers, the average length of the silicon dioxide whiskers is 1 μm, and the average diameter is 20 nm.

[0049] Example 5: The difference between this example and Example 1 is as follows: In the nanowhisker material, hydroxyapatite whiskers are replaced with hydroxyapatite whiskers of the same mass, and hydroxy-modified boron nitride is replaced with boron nitride of the same mass.

[0050] Example 6: The difference between this example and Example 1 is as follows: During the preparation process of the modified hydroxyapatite whiskers, lauroylamide is not added.

[0051] Example 7: The difference between this example and Example 1 is that: p - hydroxycinnamic acid was not added during the preparation of hydroxy - modified boron nitride.

[0052] Comparative Example Comparative Example 1: The difference between this comparative example and Example 1 is that: The oxygen plasma treatment was not carried out during the S1 process.

[0053] Comparative Example 2: The difference between this comparative example and Example 1 is that: Maleic anhydride - coated whisker material was not added during the S1 process.

[0054] Performance Detection Test 1. Dyeing Effect Detection The polyester network yarns were prepared by the methods of Examples 1 - 3 respectively, and the dye uptake rate of dyeing was detected with reference to GB / T9337 - 2009, and the data were recorded.

[0055] 2. Mechanical Property Detection The polyester network yarns were prepared by the methods of Examples 1 - 7 and Comparative Examples 1 - 2 respectively, and the breaking strength, breaking elongation at break and CV value were detected with reference to GB / T14460 - 2001, and the data were recorded.

[0056] Table 1 Performance Test Table (in the table, " / " represents that the corresponding example or comparative example did not detect this item, so there is no data) Combined with Examples 1 - 3 and Table 1, it can be seen that the polyester network yarns prepared in this application have a relatively high dye uptake rate, a relatively high breaking strength, a relatively low breaking elongation at break, and a relatively low CV value; it shows that the polyester network yarns have a good coloring effect, and under the condition of being ultra - fine, they have good strength and elasticity, and can extend the durability and service life of polyester fiber filaments.

[0057] Combined with Example 1 and Examples 4 - 7 and Table 1, it can be seen that in Example 4, the nano - whisker material is silicon dioxide whisker, the average length of the silicon dioxide whisker is 1μm, and the average diameter is 20nm. Compared with Example 1, the breaking strength of the polyester network yarn prepared in Example 4 is lower than that in Example 1; it shows that the silicon dioxide whisker not only has no layer structure, but also lacks polar groups on the surface, which is likely to affect the crystallization effect of the polyester network yarn, thus affecting the strength of the polyester network yarn.

[0058] In Example 5, hydroxyapatite whiskers were replaced with modified hydroxyapatite whiskers of the same mass in the nanowhisker material, and boron nitride was replaced with hydroxy-modified boron nitride of the same mass. Compared with Example 1, the breaking strength of the polyester network yarn prepared in Example 5 was lower than that in Example 1. This shows that the hydroxy-modified nanowhiskers can enrich the crystallization sites of PET chips, promote PET crystallization, improve the stability and orderliness of the crystallization network, and thus increase the strength of the polyester network yarn.

[0059] In Example 6, lauroylamide was not added during the preparation of the modified hydroxyapatite whiskers. Compared with Example 1, the breaking strength of the polyester network yarn prepared in Example 6 was lower than that in Example 1. This shows that the addition of lauroylamide promotes the orderly arrangement of molecular chains at the initial stage of crystallization. At high temperatures, lauroylamide gradually loses, ensuring the stability and compactness of the internal crystallization network of the polyester network yarn, and thus increasing the strength and durability of the superfine polyester network yarn.

[0060] In Example 7, p-hydroxycinnamic acid was not added during the preparation of the 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 shows that p-hydroxycinnamic acid can increase the crystallization sites of the polyester network yarn, thereby promoting the formation of a stable crystallization network in the polyester network yarn and increasing the strength of the polyester network yarn.

[0061] Combining Example 1 and Comparative Examples 1-2 and referring to Table 1, it can be seen that in Comparative Example 1, the S1 process was not treated with oxygen plasma. Compared with Example 1, the breaking strength of the polyester network yarn prepared in Comparative Example 1 was lower than that in Example 1. This shows that oxygen plasma treatment increases the surface roughness of the chips, facilitates the introduction of polar groups, increases the surface energy of PET chips, increases the crystallization sites and promotes the orderly arrangement of PET molecular chains, thereby promoting crystallization, improving the crystallization effect, making the PET crystallization more uniform and fine, and increasing the elasticity and mechanical strength of the polyester network yarn.

[0062] In Comparative Example 2, the whisker material coated with maleic anhydride was not added during the S1 process. Compared with Example 1, the breaking strength of the polyester network yarn prepared in Comparative Example 2 was lower than that in Example 1. This shows that during the pre-crystallization process, the whiskers are on the surface of PET chips. The introduction of whiskers can be inserted into the polyester molecular chains, using the whiskers as the nucleation points for crystallization, promoting the orderly arrangement of PET molecular chains, thereby promoting the formation of the crystallization network. The intercalation effect of the whiskers can refine the crystallization size of the polyester network yarn, enabling the superfine polyester network yarn to still have good mechanical properties, and also improving the flexibility and wear resistance of the polyester network yarn. At the same time, the nanoscale whiskers can reduce the activation energy of the crystallization of the polyester network yarn, accelerate the crystallization process, increase the interfacial strength and durability.

[0063] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A processing technology for colored ultra-fine flat elastic polyester network yarn, characterized in that: The steps include: S1. Treat the PET slices with oxygen plasma, then add maleic anhydride coated nano whiskers at 60-70°C, gradually heat to 200-210°C for pre-crystallization for 24-28h, and then dry at 155-165°C to obtain crystallized slices; S2, the crystallized slices are melt-spun to obtain fiber filaments; S3, the fiber filaments are subjected to annular air cooling, spinning oiling rack, and texturing treatment to obtain finished polyester network yarns.

2. The processing technology of the colored ultra-fine flat elastic polyester network yarn according to claim 1 is characterized in that: The maleic anhydride coated nano whisker is prepared from maleic anhydride melt and nano whisker material in a mass ratio of 1:1.5-3.

3. The processing technology of the colored ultra-fine flat elastic polyester network yarn according to claim 2 is characterized in that: The nano whisker material consists of modified hydroxyapatite whiskers and hydroxyl-modified boron nitride in a mass ratio of 1:0.5-2.

4. The processing technology of a colored ultra-fine flat elastic polyester network yarn according to claim 3, characterized in that: The modified hydroxyapatite whisker is prepared from hydroxyapatite whisker, polyvinyl alcohol solution and lauramide in a mass ratio of 1:0.1-0.2:0.2-0.

3.

5. The processing technology of the colored ultra-fine flat elastic polyester network yarn according to claim 3, characterized in that: 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.

6. The processing technology of the colored ultra-fine flat elastic polyester network yarn according to claim 1, characterized in that: The moisture content of the crystal slice in S1 is less than 0.02%, and the crystallinity is 18-22%.

7. The processing technology of the colored ultra-fine flat elastic polyester network yarn according to claim 1, characterized in that: The melt temperature of the melt spinning in S2 is 250-260° C., the aperture of the spinneret for spinning is 0.32-0.35 mm, the aspect ratio is 6, and the spinneret holes are arranged in a staggered layout.

8. The processing technology of the colored ultra-fine flat elastic polyester network yarn according to claim 1, characterized in that: In the S3, the height of the fiber filaments cooled by the annular air is controlled at 0.5-0.6 mm, the wind pressure is set at 0.1-0.12 MPa, and the annular air cooling is adjusted to 25-27°C.

9. The processing technology of the colored ultra-fine flat elastic polyester network yarn according to claim 1, characterized in that: The ring blowing speed of the S3 middle ring blowing cooling is 10-12m / s.

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

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