Soft velvet polyester combined filament yarn and manufacturing method thereof

Abstract

The invention discloses a soft velvet polyester combined filament yarn and a manufacturing method thereof, and relates to the field of polyester fiber manufacturing. The manufacturing method comprises the following steps: spinning and cooling polyester melt to prepare nascent fibers, dividing the nascent fibers into two groups, applying oil to prepare FDY (Fully Drawn Yarn) and POY (Pre-Oriented Yarn) respectively, and carrying out network fiber blending and winding to obtain blended yarns; the fineness of the POY yarn in the combined filament yarn is larger than that of the FDY yarn, the difference value is 10-30 dtex, and the boiling water shrinkage rate of the combined filament yarn is 60 + / -5%. The polyester combined filament yarn is suitable for preparing jacquard fabric, and it can be guaranteed that the fabric has the good soft velvet feeling.

Description

Technical Field

[0001] This application relates to the field of polyester fibers, and particularly to a soft velvet-like polyester blended filament and a manufacturing method thereof. Background Art

[0002] Traditional jacquard fabrics achieve diverse presentations of visual hierarchy and tactile texture through the combination of yarn types, innovation in arrangement methods, and the design of fabric organizational structures. Its unique dense yarn count structure poses extremely high requirements for the uniformity and stability of raw materials, which also enables the finished fabric to have excellent shape stability, easy care, and wearing comfort. The current mainstream process mostly adopts the interweaving system of polyester filament and cotton yarn. Through the difference in the dyeing properties of polyester-cotton bicomponent fibers, a natural yarn-dyed effect can be formed in a single dyeing process, significantly improving production efficiency. However, the shrinkage difference between polyester and cotton fibers in a humid and hot environment causes defects such as surface blistering and fabric wrinkling after the fabric is dyed, severely restricting the application expansion of such products in the high-end home textile field.

[0003] In recent years, the industry has attempted to use pre-oriented yarn (POY) and fully drawn yarn (FDY) blended filaments to prepare polyester blended filaments (ITY) as jacquard raw materials. This technical route effectively simplifies the yarn processing link in the traditional process and reduces energy consumption and man-hour costs. Although POY and FDY both belong to the polyester system, the difference in their molecular orientation degrees will still result in a difference in thermal shrinkage rate. This shrinkage difference can form a helical crimp structure after heat treatment such as dyeing and finishing, increasing the woolly feeling of the fabric. However, an excessive shrinkage difference will also cause obvious fabric surface defects such as blistering and wrinkling, resulting in a decrease in the surface flatness of the fabric and making it impossible to obtain a smooth and plush-rich soft velvet-like fabric. Summary of the Invention

[0004] This application provides a soft velvet-like polyester blended filament and a manufacturing method thereof. The manufacturing method can obtain a blended jacquard fabric with excellent woolly feeling and no blistering or wrinkling after dyeing and finishing.

[0005] In a first aspect, this application provides a manufacturing method of a soft velvet-like polyester blended filament. The as-spun fiber is obtained by melt spinning and cooling of a polyester melt. The as-spun fiber is divided into two groups. After oiling, FDY filament and POY filament are respectively prepared, and then the blended filament is obtained through network blending and winding; the fineness of the POY filament in the blended filament is greater than that of the FDY filament, and the difference is 10 - 30 dtex, and the boiling water shrinkage rate of the blended filament is 60 ± 5%.

[0006] In any of the above technical solutions, the specification of the blended filament is 135 dtex / 108F, wherein the fineness of the POY filament is 70 - 80 dtex, and the fineness of the FDY filament is 50 - 65 dtex.

[0007] This application reduces the shrinkage rate difference between FDY yarn and POY yarn in the blended fiber yarn. This application controls the decitex of POY yarn to be greater than that of FDY yarn, and the difference is in the range of 10 - 30 dtex, so that a blended fiber yarn with a relatively moderate boiling water shrinkage rate can be obtained, in order to obtain a blended fiber that has excellent wool-like feel and does not bubble or wrinkle after dyeing and finishing, and further obtain a smooth and plush-rich soft velvet-like jacquard fabric. It should be noted that when the difference between the decitex of POY yarn and FDY yarn in the blended fiber yarn is too high, the boiling water shrinkage rate of the obtained blended fiber yarn is too high, resulting in the jacquard fabric being prone to fuzzing and wrinkling. On the contrary, when the difference is too low, the boiling water shrinkage rate of the blended fiber yarn is too low, resulting in insufficient curly structure formed after the dyeing and finishing treatment of the jacquard fabric and a decrease in the wool-like feel.

[0008] It should be noted that the decitex of FDY yarn and POY yarn depends on the fineness of the single fiber before bundling, and the fineness of the single fiber (as-spun fiber) is controlled by a metering pump.

[0009] In any of the above technical solutions, the oil content of the blended fiber yarn is 0.40 ± 0.1%.

[0010] In any of the above technical solutions, the drawing temperature of the FDY yarn during drawing and setting is 82 - 88 °C, the setting temperature is 105 - 120 °C, and the draw ratio after drawing and setting is 2.8 - 3.3.

[0011] In any of the above technical solutions, the number of network points of the blended fiber yarn is 25 - 30 per meter.

[0012] The existing network structure of the blended fiber is relatively loose and has fewer network points (15 - 20 per meter). It is difficult to form a stable fiber synergistic system during the subsequent weaving process. When subjected to external forces, the excessive shrinkage difference will exacerbate the displacement and dislocation between fibers, ultimately affecting the surface flatness of the fabric. By increasing the number of network points in this application, the firmness of the blended fiber combination can be improved, and the flatness problem caused by fiber misalignment can be reduced.

[0013] In any of the above technical solutions, the spinning speed is 3000 - 4000 m / min, the spinning temperature is 285 - 290 °C, the cooling air pressure is 30 ± 10 Pa, and the air temperature is 20 ± 5 °C.

[0014] In any of the above technical solutions, the polyester melt contains 1.5 - 2.5 wt% of modified nano-titanium dioxide, and the surface of the modified nano-titanium dioxide is grafted with ester groups.

[0015] In this application, the above-mentioned modified nano-titanium dioxide is added to the polyester melt through an on-line addition system.

[0016] Exemplarily, the polyester melt contains 2 wt% of modified nano-titanium dioxide, that is, the mass ratio of modified nano-titanium dioxide to polyester melt is 2:98.

[0017] In any of the above technical solutions, the D50 particle size of the nano-titanium dioxide is 50 to 500 nm, more preferably 100 to 300 nm.

[0018] In any of the above technical solutions, the ester group is obtained by grafting methacrylate onto the surface of modified nano-titanium dioxide.

[0019] In any of the above technical solutions, the raw materials of the modified nano-titanium dioxide include nano-titanium dioxide, methacryloxy siloxane, methacrylate, and an alkenyl compound with a nitrogen-containing heterocycle in a mass ratio of 1: 0.15 to 0.25: 0.8 to 1.2: 0.3 to 0.5.

[0020] The above methacryloxy siloxane is used to modify the surface of nano-titanium dioxide, and then a free radical copolymerization reaction is carried out with methacrylate and an alkenyl compound with a nitrogen-containing heterocycle.

[0021] In any of the above technical solutions, the methacryloxy siloxane is selected from one or more of methacryloxypropyltrimethoxysilane, methacryloxyethyltrimethoxysilane, methacryloxyphenyltrimethoxysilane, and methacryloxymethyldiethoxysilane.

[0022] In any of the above technical solutions, the methacrylate is selected from one or more of methyl methacrylate, ethyl methacrylate, propyl methacrylate, or butyl methacrylate.

[0023] In any of the above technical solutions, the alkenyl compound with a nitrogen-containing heterocycle is selected from one or more of vinyl imidazole, allyl imidazole, vinyl pyrrolidone, and vinyl pyridine.

[0024] In any of the above technical solutions, the free radical copolymerization reaction is carried out under an initiator, and the initiator is selected from persulfate or benzoyl peroxide.

[0025] Exemplarily, the dosage of the initiator is 1 to 2 wt% of the sum of the masses of methacryloxy siloxane, methacrylate, and an alkenyl compound with a nitrogen-containing heterocycle.

[0026] In any of the above technical solutions, the diluting oil for oiling contains 1 to 3 wt% of a water-soluble copper salt.

[0027] Exemplarily, the water-soluble copper salt is selected from copper chloride, copper sulfate, or copper acetate.

[0028] When the decitex of POY is significantly higher than that of FDY, due to the finer diameter and lower shrinkage rate of FDY filaments, fiber slippage or even breakage is likely to occur between fibers under repeated friction or external stretching, resulting in fuzzing or broken ends. To overcome this problem, in this application, an appropriate amount of modified nano-titanium dioxide is added to the polyester melt. The rigid core of the nano-titanium dioxide can induce local stress concentration during the fiber stretching process, promoting the orientation arrangement of polyester molecular chains and enhancing the fiber breaking strength. In addition, the ester groups grafted on its surface form hydrogen bond interactions with the ester bonds of the polyester molecular chains, significantly improving the dispersion stability of the nanoparticles in the melt and avoiding the spinning broken end problem caused by agglomeration.

[0029] Furthermore, a nitrogen-containing heterocycle is introduced on the surface of the modified nano-titanium dioxide. When the mixed fiber filaments contact an oil agent containing copper ions during the oiling process, the copper ions diffuse into the fiber interior at a high temperature of 82 - 120 °C during drawing and setting, and coordinate with the amino groups on the surface of the nanoparticles to form stable Cu-N coordination bonds. This strong coordination effect can construct three-dimensional crosslinking points inside the fiber, restricting the sliding movement of molecular chains and reducing the phenomena of floating filaments and broken ends caused by friction with the equipment.

[0030] It should be noted that emulsion-type dilution oil is usually used for oiling and bundling polyester fibers, which is prepared by dispersing and mixing an oil agent, an emulsifier, and water.

[0031] Exemplarily, the emulsifier is fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether.

[0032] In any of the above technical solutions, the content of the oil agent in the dilution oil is 20 - 30 wt%.

[0033] In a second aspect, this application provides a soft velvet-like polyester mixed fiber filament, which is prepared by any of the above manufacturing methods.

[0034] In summary, this application has the following beneficial effects: By regulating the fineness difference (15 - 30 dtex) and boiling water shrinkage rate (60 ± 5%) of POY and FDY, this application enables the mixed fiber filaments to have a moderate shrinkage difference during dyeing and finishing, forming a soft velvet touch while avoiding excessive wrinkling. By introducing ester group / nitrogen-containing heterocycle bifunctionalized nano-titanium dioxide and synergistically forming a coordination enhancement effect with water-soluble copper salts, the breaking strength and wear resistance of the mixed fiber filaments are improved. After high-temperature dyeing, the warp shrinkage rate fluctuation of the obtained fabric is reduced, and the fabric surface flatness reaches level 4 (AATCC 124), and the comprehensive performance meets the requirements of high-end home textile fabrics. Description of the Drawings

[0035] Figure 1 It is a schematic diagram of the production process flow of the soft velvet-like polyester mixed fiber filament of this application.

[0036] Description of the Reference Numerals: 1. FDY metering pump; 2. POY metering pump; 3. Spinning pack; 4. Air box; 5. Oil application device; 6. Guide disk GR0; 7. Five-roll hot roll box; 8. Guide disk GR1; 9. Pre-networker; 10. Guide disk GR2; 11. Main networker; 12. Guide disk GR3; 13. Winder. Specific implementation method

[0037] In the following examples and comparative examples, the polyester melt has an intrinsic viscosity of 0.640 dL / g, an end carboxyl value of 44 mol / t, and a melting point of 254 °C.

[0038] Preparation Example 1, modified nano-titanium dioxide, was prepared by the following method: Disperse 1 kg of nano-titanium dioxide (D50 = 200 nm) in ethanol, add 0.15 kg of methacryloxypropyltrimethoxysilane, reflux at 80 °C for 2 hours, centrifuge and dry to obtain silanized TiO2. Mix it with 0.9 kg of methyl methacrylate and 0.3 kg of vinylimidazole, add 0.15 kg of a water / ethanol mixed solvent (volume ratio 1:1) containing 20 wt% of ammonium persulfate, and react at 75 °C for 5 hours under nitrogen protection. The product was washed with acetone and dried in vacuum to obtain modified nano-titanium dioxide with surface-grafted ester groups and nitrogen-containing heterocycles.

[0039] Preparation Example 2, modified nano-titanium dioxide, was prepared by the following method: Disperse 1 kg of nano-titanium dioxide (D50 = 100 nm) in ethanol, add 0.25 kg of methacryloxyethyltrimethoxysilane, reflux at 80 °C for 2 hours, centrifuge and dry to obtain silanized TiO2. Mix it with 1.2 kg of butyl methacrylate and 0.5 kg of allylimidazole, add 0.2 kg of a water / ethanol mixed solvent (volume ratio 1:1) containing 20 wt% of benzoyl peroxide, and react at 80 °C for 54 hours under nitrogen protection. The product was washed with acetone and dried in vacuum to obtain modified nano-titanium dioxide with surface-grafted ester groups and nitrogen-containing heterocycles.

[0040] Preparation Example 3, modified nano-titanium dioxide, was prepared by the following method: Disperse 1 kg of nano-titanium dioxide (D50 = 300 nm) in ethanol, add 0.18 kg of methacryloxyphenyltrimethoxysilane, reflux at 80 °C for 2 hours, centrifuge and dry to obtain silanized TiO2. Mix it with 1.0 kg of ethyl methacrylate and 0.4 kg of vinylpyridine, add 0.25 kg of a water / ethanol mixed solvent (volume ratio 1:1) containing 10 wt% of ammonium persulfate, and react at 82 °C for 4 hours under nitrogen protection. The product was washed with acetone and dried in vacuum to obtain modified nano-titanium dioxide with surface-grafted ester groups and nitrogen-containing heterocycles.

[0041] Preparation Example 4, modified nano-titanium dioxide, which is different from Preparation Example 1 in that methyl methacrylate is replaced with vinyl imidazole in equal amounts.

[0042] Preparation Example 5, modified nano-titanium dioxide, which is different from Preparation Example 1 in that vinyl imidazole is replaced with methyl methacrylate in equal amounts.

[0043] Example 1, a soft and fluffy polyester conjugate fiber, is manufactured according to the following steps: The polyester melt (containing 2.05 wt% of the modified nano-titanium dioxide of Preparation Example 1) is extruded from the spinneret of the spinning pack (the spinning box temperature is 286 - 289 °C), and after being cooled and formed by ring blowing (wind temperature 20 ± 1 °C, wind speed 28 pa), the nascent fiber is obtained. The nascent fibers produced by half of the spinning positions are oiled and bundled using a diluted oil emulsion (TK-1009 oil agent 25 wt%, emulsifier 2.0 wt%, copper sulfate 2.0 wt%, and the balance is water, oil temperature 40 °C). The obtained tow enters the five-roll hot roll box through the godet GR0 for drawing and setting. The total draw ratio is 3.1, the temperatures of the draw rolls HR1 - HR3 are 85 - 87 °C, and the temperatures of the setting rolls HR4 - HR5 are 110 ± 2 °C, obtaining FDY filaments with a fineness of 60 dtex. The nascent fibers produced by the other half of the spinning positions are oiled and bundled using a diluted oil (TK-1009 oil agent 20 wt%, fatty alcohol polyoxyethylene ether AEO-9 1.5 wt%, copper sulfate 1.5 wt%, and the balance is water, oil temperature 40 °C), obtaining POY filaments with a fineness of 75 dtex.

[0044] The above-prepared FDY filaments enter the pre-networker through the godet GR1 and are mixed with the POY filaments for the first network mixing (air pressure 0.2 MPa). After the mixed fiber passes through the godet GR2, it enters the main networker (air pressure 0.4 MPa) for the second network mixing, obtaining a mixed fiber with 28 network points per meter. The mixed fiber passes through the godet GR3 and enters the winding machine (spinning speed 3400 m / min), obtaining a soft and fluffy polyester conjugate fiber with a fineness of 135 dtex / 108F and a boiling water shrinkage rate of 60%.

[0045] Example 2, a soft and fluffy polyester conjugate fiber, is manufactured according to the following steps: The polyester melt (containing 1.6 wt% of the modified nano-titanium dioxide prepared in Preparation Example 2) is extruded from the spinneret of the spinning pack (the spinning box temperature is 285 - 287 °C), and after being cooled and shaped by ring blowing (the air temperature is 23 ± 1 °C, and the air speed is 35 Pa), the nascent fibers are obtained. The nascent fibers produced at half of the spinning positions are oiled and bundled using a diluted oil emulsion (20 wt% of TK-1009 oil agent, 2.0 wt% of emulsifier, 1.5 wt% of copper sulfate, and the balance is water, the oil temperature is 40 °C). The obtained tow enters the five-roll hot roll box through the godet GR0 for drawing and setting. The total drawing ratio is 3.4, the temperatures of the drawing rolls HR1 - HR3 are 82 - 84 °C, and the temperatures of the setting rolls HR4 - HR5 are 108 ± 2 °C, obtaining FDY filaments with a fineness of 55 dtex. The nascent fibers produced at the other half of the spinning positions are oiled and bundled using a diluted oil (20 wt% of TK-1009 oil agent, 1.5 wt% of fatty alcohol polyoxyethylene ether AEO-9, 1.0 wt% of copper sulfate, and the balance is water, the oil temperature is 40 °C), obtaining POY filaments with a fineness of 80 dtex.

[0046] The above-prepared FDY filaments enter the pre-networker through the godet GR1 and are mixed with the POY filaments for the first network mixing (the air pressure is 0.3 MPa). After the mixed filaments pass through the godet GR2, they enter the main networker (the air pressure is 0.5 MPa) for the second network mixing, obtaining mixed filaments with 29 network points per meter. The mixed filaments pass through the godet GR3 and enter the winding machine (the spinning speed is 3100 m / min), obtaining soft and fluffy feeling polyester mixed filaments with 135 dtex / 108F and a boiling water shrinkage rate of 64%.

[0047] Example 3, A soft and fluffy feeling polyester mixed filament is manufactured according to the following steps: The polyester melt (containing 2.5 wt% of the modified nano-titanium dioxide prepared in Preparation Example 3) is extruded from the spinneret of the spinning pack (the spinning box temperature is 286 - 289 °C), and after being cooled and shaped by ring blowing (the air temperature is 20 ± 1 °C, and the air speed is 30 Pa), the nascent fibers are obtained. The nascent fibers produced at half of the spinning positions are oiled and bundled using a diluted oil emulsion (30 wt% of TK-1009 oil agent, 2.5 wt% of emulsifier, 3.0 wt% of copper chloride, and the balance is water, the oil temperature is 40 °C). The obtained tow enters the five-roll hot roll box through the godet GR0 for drawing and setting. The total drawing ratio is 3.0, the temperatures of the drawing rolls HR1 - HR3 are 85 - 87 °C, and the temperatures of the setting rolls HR4 - HR5 are 115 ± 2 °C, obtaining FDY filaments with a fineness of 65 dtex. The nascent fibers produced at the other half of the spinning positions are oiled and bundled using a diluted oil (25 wt% of TK-1009 oil agent, 2.0 wt% of fatty alcohol polyoxyethylene ether AEO-9, 2.5 wt% of copper chloride, and the balance is water, the oil temperature is 40 °C), obtaining POY filaments with a fineness of 70 dtex.

[0048] The obtained FDY yarn and POY yarn enter the pre-networker through the godet GR1 for the first network mixing (air pressure 0.1 MPa). After mixing, they enter the main networker (air pressure 0.5 MPa) through the godet GR2 for the second network mixing, resulting in a mixed fiber with 25 network points per meter. The mixed fiber enters the winding machine (spinning speed 3400 m / min) through the godet GR3, obtaining a soft and fluffy polyester mixed fiber yarn with a fineness of 135 dtex / 108F and a boiling water shrinkage rate of 56%.

[0049] Example 4, a soft and fluffy polyester mixed fiber yarn, different from Example 1, and different from Preparation Example 1 in that the modified nano-titanium dioxide of Preparation Example 4 is used to replace the modified nano-titanium dioxide of Preparation Example 1 in the polyester melt in equal amounts.

[0050] Example 5, a soft and fluffy polyester mixed fiber yarn, different from Example 1, and different from Preparation Example 1 in that the modified nano-titanium dioxide of Preparation Example 5 is used to replace the modified nano-titanium dioxide of Preparation Example 1 in the polyester melt in equal amounts.

[0051] Example 6, a soft and fluffy polyester mixed fiber yarn, different from Example 1, and different from Preparation Example 1 in that copper sulfate is not added to the dilution oil of the FDY yarn and POY yarn, and the amount of water is increased accordingly.

[0052] Example 7, a soft and fluffy polyester mixed fiber yarn, different from Example 4, and different from Preparation Example 1 in that copper sulfate is not added to the dilution oil of the FDY yarn and POY yarn, and the amount of water is increased accordingly.

[0053] Example 8, a soft and fluffy polyester mixed fiber yarn, different from Example 1, and different from Preparation Example 1 in that no modified nano-titanium dioxide is added to the polyester melt.

[0054] Comparative Example 1, a polyester mixed fiber yarn, different from Example 1, in that the fineness of the nascent fiber is controlled by a metering pump to obtain a POY yarn with a fineness of 45 dtex and a POY yarn with a fineness of 90 dtex, and a mixed fiber yarn with a boiling water shrinkage rate of 76% is prepared.

[0055] Comparative Example 2, a polyester mixed fiber yarn, different from Example 1, in that the fineness of the nascent fiber is controlled by a metering pump to obtain a POY yarn with a fineness of 80 dtex and a POY yarn with a fineness of 55 dtex, and a mixed fiber yarn with a boiling water shrinkage rate of 43.2% is prepared.

[0056] The performance results of the above examples and comparative examples are described below in combination with experiments.

[0057] 1. Testing of the boiling water shrinkage rate and texturing degree of the blended filaments: The boiling water shrinkage rate was detected according to the provisions of FZ / T 54118-2019; the texturing degree was detected according to the provisions of FZ / T 50001-2016.

[0058] 2. Testing of the plush feeling Specimen preparation: The polyester blended filaments of the examples and comparative examples were made into jacquard fabrics, with a plain jacquard weave structure, and the warp and weft densities were 120×80 roots / cm². Then the jacquard fabrics were dyed and shaped. Dyeing conditions: disperse dyes, bath ratio 1:20, 130°C×30 min; shaping conditions: 150°C×30 s, overfeed rate 3%.

[0059] Method for testing the wool feeling: 10 trained personnel conducted blind tests (wearing eye masks), scored on a scale of 1-5 (1 point: smooth without plush feeling, 5 points: significantly soft plush feeling), and the arithmetic mean was taken.

[0060] Method for testing the flatness: The flatness of the fabric was evaluated by referring to the fabric flatness evaluation method in AATCC 124-2018 "Appearance Flatness of Fabrics after Home Laundering", and rated on a scale of 1-5 (5 is the best flatness), and the rating result was allowed to be an intermediate level between two levels, such as 4.5 and 3.5.

[0061] 3. Testing of the strength performance of the blended filaments Specimen: The polyester blended filaments obtained from the above examples and comparative examples.

[0062] (1) Tensile strength: Tested according to the requirements of GB / T 14344-2008, the distance between the clamps was 500 mm, and the tensile speed was 500 mm / min.

[0063] (2) Statistics of filament floating and breaking during production: Record the number of filament floating and breaking (times / day•108 positions) during 24 hours of continuous production at 108 spinning positions.

[0064] Table 1. Performance test results

[0065] Analysis of test results: 1. Plush feeling of the fabric: In Examples 1-3, the fineness difference between POY / FDY was controlled at 15-30 dtex, and the boiling water shrinkage rate was controlled at 60±5%, and jacquard fabrics with both the wool feeling and flatness scores and ratings greater than 4 were obtained, meeting the requirements of soft plush feeling. In Comparative Example 1, the fineness difference was too high (45 dtex), and the blended fibers showed excessive shrinkage and curling (76%), resulting in a rough touch. In Comparative Example 2, the fineness was too low (25 dtex), and the blended fibers had insufficient shrinkage and curling structure (43.2%), with a smooth touch but poor plush feeling, not meeting the requirements of plush feeling fabrics.

[0066] 2. Blended fiber strength performance: In Examples 1-3, nano-TiO₂ modified with ester groups and nitrogen-containing heterocycles was used, in combination with copper salts in the finishing agent, effectively reducing wear during processing, reducing the phenomena of floating filaments and broken ends, and thus improving the breaking strength of polyester filaments. In Example 4, amino groups were not grafted onto the surface of the modified nano-TiO₂, resulting in its inability to coordinate with copper ions in the finishing agent and its inability to effectively inhibit fiber damage caused by friction, leading to a decrease in its strength and an increase in the phenomena of floating filaments and broken ends. In Example 5, ester groups were not grafted onto the surface of the modified nano-TiO₂, resulting in a decrease in the compatibility between nano-TiO₂ and the polyester melt, easy agglomeration and an increase in frictional resistance, causing the phenomena of floating filaments and broken ends.

[0067] This specific embodiment is only an explanation 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 method for producing a soft velvety polyester blended yarn, characterized in that: The polyester melt is spun and cooled to obtain primary fibers, which are divided into two groups. After oiling, FDY yarns and POY yarns are prepared respectively, and then mixed yarns are prepared through network blending and winding. The fineness of the POY yarn in the mixed yarn is greater than that of the FDY yarn, and the difference is 15 to 30 dtex. The boiling water shrinkage of the mixed yarn is 60±5%.

2. The manufacturing method according to claim 1, characterized in that: The specification of the mixed fiber yarn is 135dtex / 108F, wherein the fineness of the POY yarn is 70-80dtex, and the fineness of the FDY yarn is 50-65dtex.

3. The manufacturing method according to claim 1, characterized in that: The oil content of the mixed fiber is 0.40±0.1%.

4. The manufacturing method according to claim 1, characterized in that: The drawing temperature of the FDY yarn during drawing and setting is 82-88° C., the setting temperature is 105-120° C., and the stretching ratio after drawing and setting is 2.8-3.

3.

5. The manufacturing method according to claim 1, characterized in that: The number of network points of the mixed fiber yarn is 25 to 30 per meter.

6. The manufacturing method according to claim 1, characterized in that: The spinning speed of the mixed fiber yarn is 3000-4000 m / min, the spinning temperature is 285-290°C, the cooling air pressure is 30±10 Pa, and the air temperature is 20±5°C.

7. The manufacturing method according to claim 1, characterized in that: The polyester melt contains 1.5-2.5wt% of modified nano titanium dioxide, and ester groups are grafted on the surface of the modified nano titanium dioxide.

8. The manufacturing method according to claim 7, characterized in that: The raw materials of the modified nano titanium dioxide include nano titanium dioxide, methacryloxysiloxane, methacrylate, and alkenyl compounds with nitrogen-containing heterocyclic rings in a mass ratio of 1:0.15-0.25:0.8-1.2:0.3-0.

5.

9. The manufacturing method according to claim 8, characterized in that: The diluent oil for oiling contains 1 to 3 wt % of water-soluble copper salt.

10. A soft velvety polyester blended yarn, characterized in that: The invention is prepared by the method according to any one of claims 1 to 9.

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