Processing method for colored ultra-fine flat elastic polyester interlaced yarns

Abstract

The present application relates to the field of fiber processing. Particularly disclosed is a processing method for colored ultra-fine flat elastic polyester interlaced yarns, the processing method comprising the following steps: S1, subjecting PET chips to an oxygen plasma treatment, then adding maleic anhydride-coated nanowhiskers at 60-70°C, gradually increasing the temperature to 200-210°C to perform pre-crystallization for 24-28 h, and then drying same at 155-165°C to obtain crystallized chips; S2, subjecting the crystallized chips to melt spinning to obtain fiber filaments; and S3, subjecting the fiber filaments to circular blowing cooling, passing the fiber filaments through a spin-finish applicator, and performing texturing to obtain the polyester interlaced yarns. The polyester interlaced yarns prepared by the present application have the advantages of good dyeing effect, stable color, ultra-fine fineness with relatively high strength, good elasticity, easily controllable flatness, and good stability.

Description

Processing technology of colored superfine flat elastic polyester network yarn TECHNICAL FIELD

[0001] The present application relates to the field of fiber processing, more particularly, it relates to a processing technology of colored superfine flat elastic polyester network yarn. BACKGROUND

[0002] The polyester network yarn is a network yarn prepared from polyester fiber, which is generally applied in the fields of clothing, industry, textile industry, etc.; the polyester network yarn not only has excellent elasticity, but also is not easy to deform, and the polyester network yarn has low moisture absorption, and has good wear resistance, heat resistance and corrosion resistance.

[0003] However, the dyeing uniformity of the polyester network yarn is poor, and the color stability problem is prone to occur, and the strength of the polyester network yarn is prone to decrease when the polyester network yarn reaches the superfine form, and the flatness is difficult to control, and the stability is poor.

[0004] Therefore, how to prepare a new polyester network yarn which has the advantages of good dyeing effect, color stability, superfine, high strength, good elasticity, easy-to-control flatness and good stability is a problem to be solved. SUMMARY

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

[0006] The processing technology of colored superfine flat elastic polyester network yarn provided by the present application adopts the following technical scheme:

[0007] The processing technology of colored superfine flat elastic polyester network yarn comprises the following steps:

[0008] S1, PET chips are subjected to oxygen plasma treatment, then maleic anhydride coated nanowhiskers are added under the condition of 60-70 DEG C, gradually heated to 200-210 DEG C for pre-crystallization for 24-28 h, then dried under the condition of 155-165 DEG C, to obtain crystallized chips;

[0009] S2, the crystallized chips are subjected to melt spinning to obtain fiber yarns;

[0010] S3, the fiber yarns are subjected to ring blowing air cooling, spinning oiling frame, and elasticizing treatment to obtain finished polyester network yarns.

[0011] By adopting the technical scheme, after the PET chip is treated by oxygen plasma, the surface roughness of the PET chip is increased, and a polar group is introduced, and the surface energy of the PET chip is increased, the polar group and the large surface energy can increase the nucleation point of crystallization, promote the ordered arrangement of the PET molecular chain, improve the pre-crystallization effect, and also make the PET crystallization more uniform and fine, and improve the elasticity and mechanical strength of the polyester network yarn.

[0012] After the PET chip is treated by oxygen plasma, the maleic anhydride hot melt generates viscosity under the condition of 60-70℃, so that the PET chip surface is loaded with a maleic anhydride coated nanocrystalline whisker, and the maleic anhydride gradually flows out under the condition of 200-210℃. During the pre-crystallization process, the whisker is on the surface of the PET chip, the whisker can be inserted into the polyester molecular chain, the whisker is used as the nucleation point of crystallization, and the ordered arrangement of the PET molecular chain is promoted, so that the formation of the crystalline network is promoted, and the intercalation effect of the whisker can refine the crystalline size of the polyester network yarn, so that the ultra-fine polyester network yarn still has good mechanical properties, and the flexibility and wear resistance of the polyester network yarn are also improved. The nanoscale whisker can reduce the activation energy of the polyester network yarn crystallization, accelerate the crystallization process, increase the interface strength and durability.

[0013] By limiting the drying temperature, the PET chip after pre-crystallization forms a more stable crystal structure, ensures the stability of the size and the stability of the crystallization, and thus ensures that the polyester network yarn has good mechanical properties.

[0014] The crystallized chip is subjected to melt spinning, air blowing cooling, spinning oiling, and elasticizing treatment, so that the polyester network yarn is easy to dye, the dyeing effect and dyeing uniformity are improved, the color balance is balanced, the prepared ultra-fine fiber yarn still has high strength and good elasticity, the flatness is uniform, and the stability is good.

[0015] Preferably, the maleic anhydride coated nanocrystalline whisker is prepared from maleic anhydride melt and nanocrystalline whisker material with a mass ratio of 1:1.5-3.

[0016] By adopting the technical scheme, the viscosity of the maleic anhydride melt is used to adhere to the surface of the nanocrystalline whisker material, the maleic anhydride melt can promote the adhesion of the nanocrystalline whisker material to the surface of the PET chip, and in the pre-crystallization process, the nanocrystalline whisker material can increase the interface area and the nucleation point of crystallization, promote the ordered arrangement of the PET chip molecular chain, form a certain crystalline network, and help to improve the mechanical properties and size stability of the PET; and after heating at 200-210℃ for 24-28h, the maleic anhydride gradually decomposes, and is not easy to stay in the polyester network yarn to affect its performance, so as to ensure the crystallization effect of the polyester network yarn.

[0017] Preferably, the nanowhisker material is composed of modified hydroxyapatite whiskers and hydroxyl modified boron nitride in a mass ratio of 1:0.5-2.

[0018] By adopting the above technical solution, the modified hydroxyapatite whiskers and the hydroxyl modified boron nitride are matched, the modified hydroxyapatite whiskers are used as the nucleating agent for PET crystallization, the energy barrier of crystallization is reduced, the PET crystallization is promoted, the crystalline particles are refined by the thorn-like whisker interpenetration effect of the hydroxyapatite whiskers, the polyester network yarn has the advantages of superfine and good mechanical properties, the interface connection effect between the PET molecules is improved by the hydroxyl groups of the hydroxyapatite whiskers, the PET molecules are attracted to each other to form an ordered and dense crystalline network, and the strength of the superfine polyester network yarn is further ensured; the layered structure of the boron nitride in the hydroxyl modified boron nitride and the hydroxyl groups on the surface of the layered boron nitride further increase the number of crystallization starting points, reduce the energy barrier of crystallization, the layered boron nitride is easy to interpenetrate with the PET molecular chain, and the molecular chain is further arranged in order, the crystallization starting points are increased on the surface of the layered boron nitride, the molecular chain is arranged in order, the stability of the crystalline network is improved, and the strength and elasticity of the polyester network yarn are improved.

[0019] Preferably, the modified hydroxyapatite whiskers are prepared from hydroxyapatite whiskers, polyvinyl alcohol solution and lauryl amide in a mass ratio of 1:0.1-0.2:0.2-0.3.

[0020] By adopting the above technical solution, the viscosity of the polyvinyl alcohol solution is used to adhere the granular lauryl amide to the surface of the hydroxyapatite whiskers, the polyvinyl alcohol solution contains hydroxyl groups, and the lauryl amide contains amide groups, so that the hydroxyl groups exist on the surface of the hydroxyapatite whiskers while the lauryl amide is stably adhered.

[0021] In the initial stage of the temperature rise in the pre-crystallization process, the hydroxyl groups on the surface of the hydroxyapatite whiskers cooperate with the hydroxyl groups in the polyvinyl alcohol to provide more crystallization starting points for crystallization, the lauryl amide attracts the PET molecular chain to arrange in order around the nucleation site, in the long-term pre-crystallization process, the boiling point of the lauryl amide is about 199℃, the lauryl amide gradually loses when the boiling point is reached, the lauryl amide site originally provides space for crystalline growth, further promotes the ordered growth of the crystalline particles on the surface of the hydroxyapatite whiskers, and the polyester network yarn has high strength under the condition of superfine, thereby having good mechanical properties.

[0022] Preferably, the hydroxyl modified boron nitride is prepared from nanometer boron nitride, polyethylene glycol ethanol solution and p-hydroxycinnamic acid in a mass ratio of 1:0.1-0.2:0.05-0.1.

[0023] By adopting the technical scheme, the p-hydroxycinnamic acid is adhered to the surface of the nano boron nitride by using the viscosity of the polyethylene glycol solution, the crystallization sites are further increased by using the hydroxyl and carboxyl groups in the p-hydroxycinnamic acid and the hydroxyl group in the polyethylene glycol, the crystallization temperature is reduced, the crystallization speed is increased, the crystallinity and the mechanical properties of the polyester network yarn are improved, the polyethylene glycol can also increase the flexibility and impact strength of the polyester network yarn, and the strength and durability of the superfine polyester network yarn are further improved; the melting point of the p-hydroxycinnamic acid is about 212°C, the p-hydroxycinnamic acid is not easy to melt in the pre-crystallization process, and the p-hydroxycinnamic acid is melted at a high temperature of about 250°C in the melt spinning process, so that the whisker material is crystallized well at different temperatures, the PET molecular chains are gradually arranged in order, the crystallization network stability is gradually improved by using the hydroxyl and carboxyl groups to attract the molecular chains to contact each other, and the mechanical strength of the polyester network yarn prepared by spinning is further improved.

[0024] The polyethylene glycol ethanol solution penetrates into the layered structure of the nano boron nitride and is attached to the surface of the nano boron nitride, the p-hydroxycinnamic acid is dissolved in ethanol, the content of the hydroxyl and carboxyl groups of the nano boron nitride layered structure and the surface of the nano boron nitride can be further increased, the crystallization starting point is further increased, the crystallization of the polyester network yarn is promoted, and the stability of the crystallization network is improved, so that the polyester network yarn has the advantages of superfine and flatness and good mechanical properties.

[0025] Preferably, the water content of the crystallization section in S1 is less than 0.02%, and the crystallinity is 18-22%.

[0026] By adopting the technical scheme, the polyester network yarn has good crystallization effect, so that the polyester network yarn has high strength and durability.

[0027] Preferably, the melting temperature of the melt spinning in S2 is 250-260°C; the pore size of the spinning nozzle plate is 0.32-0.35mm, the length-diameter ratio is 6, and the nozzle hole arrangement is staggered.

[0028] By adopting the technical scheme, the superfine and flat polyester network yarn can be prepared, and has good elasticity and strength, and the hand feeling and durability of the finished product are improved.

[0029] Preferably, the fiber height of the loop blowing and cooling in S3 is controlled to be 0.5-0.6mm, the air pressure is set to be 0.1-0.12MPa, and the loop blowing cooling is adjusted to be 25-27°C.

[0030] Preferably, the loop blowing speed of the loop blowing and cooling in S3 is 10-12m / s.

[0031] By adopting the above technical scheme, the ring blowing cooling can not only effectively reduce the temperature of the polyester yarn and avoid damage caused by high temperature, but also ensure the quality and performance of the polyester yarn; through the ring blowing mode, the polyester yarn can be uniformly and rapidly cooled, so that the stability of the shape and the mechanical strength of the polyester yarn are maintained; the ring blowing cooling also helps to improve the production efficiency, thereby further improving the production quality and efficiency of the polyester network yarn.

[0032] Preferably, the elasticizing treatment in S3 adopts POY yarn pre-networking, and the pre-networking pressure is 0.12-0.15 MPa.

[0033] By adopting the above technical scheme, the elasticity and recovery of the POY yarn are significantly improved through the pre-networking elasticizing treatment, so that the polyester network yarn has good tensile properties and resilience, and the durability and comfort of the textile product are improved; the pre-networking elasticizing treatment also helps to enhance the wrinkle resistance of the polyester network yarn, and the polyester yarn after the elasticizing treatment is softer and fuller, so that the textile product is more attractive in terms of touch and appearance.

[0034] In summary, the present application has the following beneficial effects:

[0035] 1. After the PET chip is treated by oxygen plasma, the surface roughness of the chip is increased, and the polar groups are introduced, the surface energy of the PET chip is increased, the polar groups and the larger surface energy can increase the nucleation point of crystallization, promote the ordered arrangement of PET molecular chain, improve the pre-crystallization effect, and also make the PET crystallization more uniform and fine, improve the elasticity and mechanical strength of the polyester network yarn.

[0036] 2. The modified hydroxyapatite whisker and the hydroxyl modified boron nitride are matched, the modified hydroxyapatite whisker is used as the nucleating agent for PET crystallization, the energy barrier of crystallization is reduced, and the PET crystallization is promoted, and the thorny whisker of the hydroxyapatite whisker can refine the crystalline particles, so that the polyester network yarn has the advantages of super-fineness and good mechanical properties, and the hydroxyl group of the hydroxyapatite whisker can improve the interface connection effect between PET molecules, promote the mutual attraction of PET molecules to form an ordered and dense crystalline network, thereby further ensuring the strength of the super-fine polyester network yarn.

[0037] 3. The layered structure of the boron nitride in the hydroxyl modified boron nitride and the hydroxyl groups on the surface of the layered boron nitride further increase the number of crystallization starting points and reduce the energy barrier of crystallization, and the layered boron nitride is convenient for interpenetration with PET molecular chains, thereby further guiding the ordered arrangement of molecular chains, improving the stability of the crystalline network, and improving the strength and elasticity of the polyester network yarn.

[0038] 4. Maleic anhydride has a boiling point of about 202 degrees Celsius. In the melt spinning process, maleic anhydride gradually flows out, which does not easily affect the forming effect of the final polyester network yarn. DETAILED DESCRIPTION

[0039] The application will be further described in detail below in conjunction with examples.

[0040] The following raw materials are all ordinary commercially available.

[0041] Preparation example of modified hydroxyapatite whisker

[0042] Preparation example 1: The modified hydroxyapatite whisker is prepared by the following method:

[0043] 0.15 kg of polyvinyl alcohol solution is uniformly sprayed on the surface of 1 kg of hydroxyapatite whisker, and then 0.25 kg of lauryl amide is added at a speed of 60 g / min. During the addition process, the stirring speed of the hydroxyapatite whisker is 120 r / min. The average diameter of the hydroxyapatite whisker is 10 nm, and the average length of the hydroxyapatite whisker is 300 nm. The polyvinyl alcohol solution is a 0.5% polyvinyl alcohol aqueous solution by mass fraction. The average particle size of the lauryl amide is 80 nm. After drying and dispersing, the hydroxyapatite whisker does not agglomerate with each other. The modified hydroxyapatite whisker has an average length of less than 600 nm.

[0044] Preparation example 2: The difference between this preparation example and preparation example 1 is that:

[0045] 0.1 kg of polyvinyl alcohol solution is uniformly sprayed on the surface of 1 kg of hydroxylapatite whisker, and then 0.2 kg of lauryl amide is added at a speed of 60 g / min. During addition, the stirring speed of the hydroxyapatite whisker is 120 r / min. The hydroxyapatite whisker has an average diameter of 10 nm. After drying and dispersing, the hydroxyapatite whisker does not agglomerates with each other. The modified hydroxyapatite whisker has an average length of less than600 nm.

[0046] Preparation example 3: The difference between this preparation example and preparation example 1 is that:

[0047] 0.2 kg of polyvinyl alcohol solution is uniformly sprayed on the surface of 1 kg of hydroxlapatite whisker, and then 0.3 kg of lauryl amide is added at a speed of 60 g / min. During adding, the stirring speed of the hydroxyapatite whisker is 120 r / min. The mean diameter of the hydroxyapatite whisker is 10 nm. After drying and dispersing, the hydroxyapatite whisker does not aggregate with each other. The modified hydroxyapatite whisker has an average length of less than

[0048] Preparation example of hydroxyl-modified boron nitride

[0049] Preparation Example 4: Hydroxyl-modified boron nitride is prepared by the following method:

[0050] Spray 0.15 kg of polyethylene glycol solution on the surface of 1 kg of nano boron nitride uniformly, then add 0.08 kg of p-hydroxy cinnamic acid, the average particle size of the p-hydroxy cinnamic acid is 60 nm, the average particle size of the nano boron nitride is 200 nm, the polyethylene glycol solution is a 1% polyethylene glycol ethanol solution by mass fraction, the ethanol mass fraction is 99%, after drying and dispersing, the nano boron nitride does not agglomerate, hydroxyl-modified boron nitride is obtained, and the average particle size of the hydroxyl-modified boron nitride is less than 500 nm.

[0051] Preparation Example 5: The difference between this preparation example and Preparation Example 4 is that:

[0052] Spray 0.1 kg of polyethylene glycol solution on the surface of 1 kg of nano boron nitrate uniformly, then add 0.05 kg of p-hydroxy cinnamic acid, the average particle size of the p-hydr oxy cinnamic acid is 60 nm, the average particle size of the nano boron nitrate is 200 nm, the polyethylene glycol solution is a 1% polyethylene gly col ethanol solution by mass fraction, after drying and dispersing, the nano boron nitrate does not agglomerate, hydroxyl-modified boron nitride is obtained, and an average particle size of the hydroxyl-modified boron nitride is less than 500nm.

[0053] Preparation Example 6: The difference between this preparation example and Preparation Example 4 is that:

[0054] Spray 0.2 kg of polyethylene glycol solution on the surface of 1 kg of nano boron nitrite uniformly, then add 0.1 kg of p-hydroxy cinnamic acid, the average particle size of the p-hyd roxy cinnamic acid is 60 nm, the average particle size of the nano boron nitrile is 200 nm, the polyethylene glycol solution is a 1% polyethylene gly co l ethanol solution by mass fraction, after drying and dispersing, the nano boron nitrite does not agglomerate, hydroxyl-modified boron nitride is obtained, and a n average particle size of the hydroxyl-modified boron nitride is less than 500 n m.

[0055] Preparation Example of Maleic Anhydride Coated Whisker Material

[0056] Preparation Example 7: Maleic anhydride coated whisker material is prepared by the following method:

[0057] Mix and stir 1 kg of modified hydroxyapatite whiskers prepared in Preparation Example 1 and 1 kg of hydroxyl-modified boron nitride prepared in Preparation Example 4 to obtain nano whisker material;

[0058] Heat maleic anhydride to 60°C to completely melt to obtain a maleic anhydride melt;

[0059] 1kg of maleic anhydride melt solution is uniformly sprayed on the surface of 2kg of nanowhisker material, and then dried and dispersed to form nanowhisker material that does not adhere to each other, to obtain maleic anhydride coated nanowhisker material, the average particle size of which is less than 1μm.

[0060] Preparation Example 8: The difference between this preparation example and Preparation Example 7 is that:

[0061] 1kg of modified hydroxyapatite whisker prepared in Preparation Example 2 and 0.5kg of hydroxy-modified boron nitride prepared in Preparation Example 5 are uniformly mixed and stirred to obtain nanowhisker material;

[0062] 1kg of maleic anhydride melt solution is uniformly sprayed on the surface of 1.5kg of nanowhisker material, and then dried and dispersed to form nanowhisker material that does not adhere to each other, to obtain maleic anhydride coated nanowhisker material, the average particle size of which is less than 1μm.

[0063] Preparation Example 9: The difference between this preparation example and Preparation Example 7 is that:

[0064] 1kg of modified hydroxyapatite whisker prepared in Preparation Example 3 and 2kg of hydroxy-modified boron nitride prepared in Preparation Example 6 are uniformly mixed and stirred to obtain nanowhisker material;

[0065] 1kg of maleic anhydride melt solution is uniformly sprayed on the surface of 3kg of nanowhisker material, and then dried and dispersed to form nanowhisker material that does not adhere to each other, to obtain maleic anhydride coated nanowhisker material, the average particle size of which is less than 1μm.

[0066] Example

[0067] Example 1: A processing technology of colored superfine flat elastic polyester network yarn:

[0068] S1, PET chips are treated by oxygen plasma for 30s, the oxygen flow rate is 700mL / min; then maleic anhydride coated nanowhisker is sprayed at 65℃, the mass ratio of PET chips to maleic anhydride coated nanowhisker is 1:0.1, gradually heated to 210℃ for pre-crystallization for 24h, and then dried at 160℃ to obtain crystallized chips; the water content of the crystallized chips is less than 0.02%, and the crystallinity is 20%;

[0069] S2, the crystallized chips are melt-spun, the melt-spinning process is carried out at a melt temperature of 250℃, the spinneret hole diameter is 0.32mm, the aspect ratio is 6, and the spinneret hole arrangement is staggered, to obtain fiber yarns;

[0070] S3, the fiber yarn is cooled by ring blowing, the height of the fiber yarn is controlled at 0.5mm during the ring blowing cooling process, the wind pressure is set at 0.1MPa, the ring blowing speed is 10m / s, and the ring blowing cooling is adjusted to 25℃; then the spinning oiling frame is adopted, two independent oil supply systems are adopted to ensure that the surface of each flat yarn is evenly covered; finally, the POY yarn pre-network is introduced, the pre-network pressure is 0.12MPa, the PU disc configuration is adjusted to 1-5-1, the elasticizing treatment is performed, and the finished polyester network yarn is obtained, and the average diameter of the polyester network yarn is 1μm.

[0071] Example 2: The difference between this example and example 1 is that:

[0072] S1, the PET chip is subjected to oxygen plasma treatment for 30s, the oxygen flow is 700mL / min; then maleic anhydride coated nanowhiskers are sprayed at 60℃, the mass ratio of PET chip to maleic anhydride coated nanowhiskers is 1:0.1, gradually heated to 200℃ for 28h of pre-crystallization, and then dried at 155℃ to obtain crystallized chips; the water content of the crystallized chips is less than 0.02%, and the crystallinity is 18%;

[0073] S2, the crystallized chips are subjected to melt spinning, the melt temperature is 250℃ during the melt spinning process, the spinning nozzle plate aperture is 0.32mm, the length-diameter ratio is 6, the nozzle hole arrangement is staggered, and the fiber yarn is obtained;

[0074] S3, the fiber yarn is cooled by ring blowing, the height of the fiber yarn is controlled at 0.5mm during the ring blowing cooling process, the wind pressure is set at 0.1MPa, the ring blowing speed is 10m / s, and the ring blowing cooling is adjusted to 25℃; then the spinning oiling frame is adopted, two independent oil supply systems are adopted to ensure that the surface of each flat yarn is evenly covered; finally, the POY yarn pre-network is introduced, the pre-network pressure is 0.12MPa, the elasticizing treatment is performed, and the finished polyester network yarn is obtained.

[0075] Example 3: The difference between this example and example 1 is that:

[0076] S1, the PET chip is subjected to oxygen plasma treatment for 30s, the oxygen flow is 700mL / min; then maleic anhydride coated nanowhiskers are sprayed at 70℃, the mass ratio of PET chip to maleic anhydride coated nanowhiskers is 1:0.1, gradually heated to 210℃ for 24h of pre-crystallization, and then dried at 165℃ to obtain crystallized chips; the water content of the crystallized chips is less than 0.02%, and the crystallinity is 22%;

[0077] S2, the crystallized chips are subjected to melt spinning, the melt temperature is 260℃ during the melt spinning process, the spinning nozzle plate aperture is 0.35mm, the length-diameter ratio is 6, the nozzle hole arrangement is staggered, the fiber yarn is obtained;

[0078] S3, the fiber yarn is cooled by ring blowing, the height of the fiber yarn is controlled at 0.6 mm during the ring blowing cooling process, the air pressure is set at 0.12 MPa, the ring blowing speed is 12 m / s, and the ring blowing cooling is adjusted to 27 DEG C; then the spinning oiling frame is adopted, two independent oil supply systems are adopted to ensure that the surface of each flat yarn is evenly covered; finally, the POY yarn pre-networking is introduced, the pre-networking pressure is 0.15 MPa, the elasticizing treatment is performed, and the finished polyester network yarn is obtained.

[0079] Example 4: The difference between this example and example 1 is that:

[0080] The nanometer whisker material is a silicon dioxide whisker, the average length of the silicon dioxide whisker is 1 um, and the average diameter is 20 nm.

[0081] Example 5: The difference between this example and example 1 is that:

[0082] In the nanometer whisker material, the same mass of hydroxyapatite whisker is replaced by modified hydroxyapatite whisker, and the same mass of boron nitride is replaced by hydroxy modified boron nitride.

[0083] Example 6: The difference between this example and example 1 is that:

[0084] In the preparation process of the modified hydroxyapatite whisker, lauryl amide is not added.

[0085] Example 7: The difference between this example and example 1 is that:

[0086] In the preparation process of the hydroxy modified boron nitride, p-hydroxycinnamic acid is not added.

[0087] Comparative example

[0088] Comparative example 1: The difference between this comparative example and example 1 is that:

[0089] In the S1 process, oxygen plasma treatment is not performed.

[0090] Comparative example 2: The difference between this comparative example and example 1 is that:

[0091] In the S1 process, the maleic anhydride coated whisker material is not added.

[0092] Performance detection test

[0093] 1, dyeing effect detection

[0094] The polyester network yarns are prepared by the methods of examples 1-3 respectively, the dyeing rate of dyeing is detected according to GB / T9337-2009, the data is recorded, and the results are shown in table 1.

[0095] 2, mechanical property detection

[0096] 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. The results are shown in Table 1.

[0097] 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)

[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] It can be seen from the combination of embodiment 1 and comparative examples 1-2 and table 1 that, in the process of comparative example 1S1, no oxygen plasma treatment is performed, and the breaking strength of the polyester network yarn prepared in comparative example 1 is lower than that in embodiment 1; it is illustrated that the oxygen plasma treatment increases the surface roughness of the slice, at the same time, it is convenient to introduce polar groups, increase the surface energy of the PET slice, increase the crystallization site and promote the ordered arrangement of the PET molecular chain, so as to crystallize, improve the crystallization effect, and also make the PET crystallization more uniform and small, improve the elasticity and mechanical strength of the polyester network yarn.

[0104] In the process of comparative example 2S1, no maleic anhydride coated whisker material is added, and the breaking strength of the polyester network yarn prepared in comparative example 2 is lower than that in embodiment 1; it is illustrated that in the pre-crystallization process, the whisker is on the surface of the PET slice, the introduction of the whisker can be inserted into the polyester molecular chain, the whisker is used as the nucleation point of crystallization, and the ordered arrangement of the PET molecular chain is promoted, so as to promote the formation of the crystalline network, and the intercalation effect of the whisker can refine the crystalline size of the polyester network yarn, so that the ultra-fine polyester network yarn still has good mechanical properties, and the flexibility and wear resistance of the polyester network yarn can also be improved, at the same time, the nano-sized whisker can reduce the activation energy of the polyester network yarn crystallization, accelerate the crystallization process, increase the interface strength and durability.

[0105] The specific embodiment is only an explanation of the present application, and is not a limitation of the present application, and those skilled in the art can make modifications to the present embodiment without creative contribution according to the needs after reading the present specification, 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 ultrafine flat elastic polyester network yarn, 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 polyester network filament.

2. The processing technology of a colored ultrafine flat elastic polyester network yarn according to claim 1, characterized in that: 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 processing technology for a 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 processing technology for a 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 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 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 has an orifice diameter of 0.32-0.35mm, an aspect ratio of 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 of 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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