CN112695404A - Fine denier three-dimensional curled hollow silicon-added PTT fiber and preparation method thereof - Google Patents
Fine denier three-dimensional curled hollow silicon-added PTT fiber and preparation method thereof Download PDFInfo
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- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/78—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products
- D01F6/84—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products from copolyesters
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- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
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- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
- D01D5/092—Cooling filaments, threads or the like, leaving the spinnerettes in shafts or chimneys
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- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/096—Humidity control, or oiling, of filaments, threads or the like, leaving the spinnerettes
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
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- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
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- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
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- D01F11/00—Chemical after-treatment of artificial filaments or the like during manufacture
- D01F11/04—Chemical after-treatment of artificial filaments or the like during manufacture of synthetic polymers
- D01F11/08—Chemical after-treatment of artificial filaments or the like during manufacture of synthetic polymers of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/643—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain
- D06M15/647—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain containing polyether sequences
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- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
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Abstract
The invention discloses a fine-denier three-dimensional curled hollow silicon-added PTT fiber, which is prepared from a PTT slice and a polyether block polysiloxane silicone oil solution, and the liquid carrying rate of the fiber is controlled when silicon is applied to the fiber. The fine denier three-dimensional curled hollow silicon-added PTT fiber provided by the invention selects PTT to replace PET as a material of the three-dimensional curled hollow fiber, and plays the uniqueness of good resilience and soft hand feeling of the PTT fiber; the polyether block polysiloxane silicone oil is selected to carry out silicon coating on the three-dimensional curled hollow PTT fiber, so that the fiber is enabled to be fluffy while certain smoothness and softness are given to the fiber.
Description
Technical Field
The invention belongs to the technical field of preparation of poly (1, 3-trimethylene terephthalate) (PTT for short) fibers, and particularly relates to a fine denier three-dimensional crimped hollow silicon-added PTT fiber and a preparation method thereof.
Background
PTT and PET (short for polyethylene terephthalate) belong to homologues, but the main difference of the chemical structures of the two is that: two methylene groups are present in the chain segments of the PET molecule chain, and three methylene groups are present in the chain segments of the PTT molecule chain. Odd methylene units in the chemical structure can generate an odd carbon effect between molecular chains, so that a benzene ring and three methylene groups cannot be positioned on the same plane, the repulsion force close to two carbonyl groups cannot be arranged on a plane at 180 ℃, and the PTT macromolecular chains can only be arranged in a staggered manner at 120 ℃ in space, and thus the PTT macromolecular chains form a spiral arrangement. The molecular structure of PTT gives PTT fiber with good intrinsic recovery, and the modulus of the fiber is lower, for example, the Young's modulus of PTT is 2.58Pa, which is obviously lower than that of PET, namely 9.18Pa, which determines that PTT has softer hand feeling. Due to the "odd carbon effect", both the melting point and the glass transition temperature of PTT are about 30 ℃ lower than conventional PET. Due to the unique structural characteristics of PTT, the PTT integrates the advantages of various fibers, such as the stain resistance of terylene, the softness of chinlon, the bulkiness of acrylon and the like.
PTT is prepared by terephthalic acid and 1, 3-propanediol through polycondensation reaction, the development and application of PTT fiber are limited because domestic 1, 3-propanediol is imported from foreign countries, and the conditions for developing PTT fiber products and high-value application thereof are met along with the improvement of domestic 1, 3-propanediol production technology, the expansion of capacity and the improvement of PTT synthesis technology. At present, the linear density of the three-dimensional curled hollow silicon-added Polyester (PET) fiber for domestic ball rubbing is generally not more than 6.67dtex, and the selected silicone oil is hydrophobic silicone oil, so that the ball rubbing feels hard and has poor elasticity.
In view of the above, there is a need to develop a soft and resilient fiber.
Disclosure of Invention
The invention aims to provide a soft fine denier three-dimensional curled hollow silicon-added PTT fiber with good rebound resilience, which solves the technical problems of hard hand feeling and poor elasticity existing in the prior art that a ball is formed by twisting three-dimensional curled hollow Polyester (PET) fibers.
The invention also aims to provide a preparation method of the fine-denier three-dimensional crimped hollow silicon-added PTT fiber.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a fine-denier three-dimensional curled hollow silicon-added PTT fiber, which is prepared from a PTT slice and a polyether block polysiloxane silicone oil solution, and controls the liquid carrying rate of the fiber when silicon is applied to the fiber.
The melting point of the PTT slices is 225-230 ℃, and the intrinsic viscosity is not lower than 1.000 dl/g.
The concentration of the polyether block polysiloxane silicone oil solution is 5-6%.
The polyether block polysiloxane silicone oil solution is prepared by dissolving polyether block polysiloxane silicone oil in pure water to prepare a polyether block polysiloxane silicone oil solution with the concentration of 5-6%.
The liquid carrying rate of the fiber is calculated by dividing the weight difference between the weight of the polyether block polysiloxane silicone oil on the fiber and the weight of the polyether block polysiloxane silicone oil on the fiber before the polyether block polysiloxane silicone oil.
The liquid carrying rate of the fiber is 8.0-9.0%.
The nominal linear density of the fine denier three-dimensional curled hollow silicon-added PTT fiber is 2.78dtex to 3.33dtex, and the hollow rate of the fiber is more than or equal to 21.0 percent.
The measured fiber linear density of the fine denier three-dimensional crimp hollow silicon-added PTT fiber is 3.00 dtex-4.00 dtex, the crimp number is 7.0-8.5/25 mm, the crimp rate is 12.5-16.5%, the oil content is 0.32-0.36%, and the moisture regain is 0.4-0.43%.
The second aspect of the invention provides a preparation method of the fine denier three-dimensional curled hollow silicon-added PTT fiber, which comprises the following steps:
and carrying out boiling drying, screw extrusion melting, spinning by using a special-shaped spinneret plate, carrying out asymmetric rapid cooling by circular blowing, winding and barrel dropping on the PTT slices to prepare precursor fibers, and carrying out post-spinning bundling, drafting, yarn stacking, curling, atomizing, silicon coating, cutting, relaxation heat setting, air conveying and packaging on the precursor fibers to obtain the fine-denier three-dimensional curled hollow silicon-added PTT fiber.
The temperature of the pre-crystallization and the drying of the PTT slices after boiling drying is 145 +/-3 ℃, and the total time of the pre-crystallization and the drying is more than or equal to 4.5 h.
The spinning temperature is 250-272 ℃, and the spinning speed is 1100-1150 m/min.
The profiled spinneret plate is a single C-shaped 2288-hole hollow spinneret plate, and the theoretical hollowness of the spinneret plate is 55-57% (preferably 56.2%).
The asymmetric rapid cooling of the circular blowing air means that the air speed at the air outlet at the upper part of the circular blowing air is 3.8-4.0 m/s, and the air temperature is 22-24 ℃.
The temperature of the oil groove for drafting is 60 +/-2 ℃, the total drafting multiple is 2.28-2.82 times, and the highest speed of the third drafting machine is less than or equal to 160 m/min.
The atomization siliconizing means that the silk sheet after being taken out of the crimping machine is straightened, polyether block polysiloxane silicone oil is atomized on the front surface and the back surface of the silk sheet in the spraying box respectively by using a single nozzle, the gauge pressure of compressed air used by the nozzle is 0.7MPa, the concentration of the silicone oil is 5-6%, and the liquid carrying rate of the fiber is 8.0-9.0%.
The temperature of the relaxation heat setting is 130-150 ℃, the time is 15-18 min, the time of the drying zone is 10-12 min, and the time of the setting zone is 5-6 min.
Due to the adoption of the technical scheme, the invention has the following advantages and beneficial effects:
the fine denier three-dimensional curled hollow silicon-added PTT fiber provided by the invention selects PTT to replace PET as a material of the three-dimensional curled hollow fiber, and plays the uniqueness of good resilience and soft hand feeling of the PTT fiber; the polyether block polysiloxane silicone oil is selected to carry out silicon coating on the three-dimensional curled hollow PTT fiber, so that the fiber is enabled to be fluffy while certain smoothness and softness are given to the fiber.
In the preparation method, polyether block polysiloxane silicone oil is coated on the front and back surfaces of the silk slice by using a single nozzle in a spray box respectively, and the gauge pressure of compressed air used by the nozzle is 0.7MPa, so that the silicone oil sprayed by the nozzle has penetrating power and is completely vaporous, the oil on the silk slice is more uniform, the liquid carrying rate of the fiber can be controlled to be 8.0-9.0%, and the defects that when the silk slice is oiled by using a plurality of nozzles, the liquid carrying rate of the silk slice is about 12.0-16.0%, the oiling is not uniform, the liquid carrying rate of the fiber entering an oven is high when the fiber is loosened and thermally shaped, and the drying and shaping effects are reduced are overcome. In addition, the polyether block polysiloxane silicone oil is adopted to form silicon on the three-dimensional curled hollow PTT fiber, so that the fiber is endowed with certain smoothness and elasticity and certain moisture absorption while the fiber surface is filmed. When the subsequent ball rubbing is carried out, the three-dimensional curled hollow fiber without silicon accounts for about 10% at most, otherwise, the ball rubbing is difficult, so that silicon is required to be added to the fiber.
Drawings
FIG. 1 is a schematic representation of the shape of a fine denier three-dimensional crimped hollow silicon-added PTT fiber prepared in example 1 of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The single-component three-dimensional curled hollow fiber is spun by a hollow spinneret plate, the filaments sprayed from the spinneret plate are rapidly cooled by low-temperature and high-speed air flow, the longitudinal direction of the filaments is in a pipeline cavity shape, and the air in the cavity has a heat insulation effect, so that the cooling and curing speed of the windward side of the same filament is far higher than that of the leeward side of the same filament, and the precursor is asymmetrically cooled, after the precursor is drawn backwards, the potential asymmetric cooling characteristic of the precursor is displayed, and the fiber axially generates spiral distortion similar to the shape of a spring, namely three-dimensional curling for short, and the three-dimensional curling of the fiber also needs to be subjected to relaxation and heat setting by an oven, and is further shrunk and stabilized. And for the common monocomponent two-dimensional crimped fiber, the cooling of the precursor is uniform cooling, asymmetric cooling does not exist, after the precursor is drawn backwards, the fiber cannot generate spiral distortion similar to a spring shape around the axial direction, and the crimping of the fiber is formed by filling, extruding and crimping a fiber bundle through a crimping machine to form two-dimensional crimping similar to a W shape. For silicon on the fiber, only the surface of the fiber is oiled. And (3) relaxing and heat-setting the silicon-coated fiber by an oven, removing water in the fiber and silicone oil, and curing the silicone oil on the surface of the fiber to form a film under certain temperature and time conditions, so that the surface of the fiber has smoothness, and the curling shape of the three-dimensional curled hollow silicon-added PTT fiber is obtained from the prepared fiber shape.
Example 1
The preparation method of the fine denier three-dimensional curled hollow silicon-added PTT fiber with the nominal linear density of 2.78dtex multiplied by 32mm comprises the following steps: and carrying out boiling drying, screw extrusion melting, spinning by using a special-shaped spinneret plate, carrying out asymmetric rapid cooling by circular blowing, winding and barrel dropping on the PTT slices to prepare precursor fibers, and carrying out post-spinning bundling, drafting, yarn stacking, curling, atomizing, silicon coating, cutting, relaxation heat setting, air conveying and packaging on the precursor fibers to obtain the fine-denier three-dimensional curled hollow silicon-added PTT fiber.
The melting point of the PTT slices is 228 ℃, and the intrinsic viscosity is 1.045 dl/g.
The temperature of the pre-crystallization and the drying of the PTT slices in the boiling drying process is 145 ℃, and the total time of the pre-crystallization and the drying process is 4.5 h.
The spinning temperature of the profile spinneret plate is 250-272 ℃, and the spinning speed is 1150 m/min.
The profile spinneret plate is a single C-shaped 2288 hole hollow spinneret plate, and the theoretical hollowness of the spinneret plate is 56.2%.
The asymmetric rapid cooling of the circular blowing air means that the air speed at the air outlet at the upper part of the circular blowing air is 3.8m/s, and the air temperature is 22-24 ℃.
The temperature of the oil tank for drafting is 60-62 ℃, the total drafting multiple is 2.32 times, and the highest speed of the third drafting machine is 150 m/min.
The step of atomizing and siliconizing refers to straightening the silk sheet after being taken out of the crimping machine, and atomizing polyether block polysiloxane silicone oil on the front surface and the back surface of the silk sheet respectively by using a single nozzle in a spray box, wherein the gauge pressure of compressed air used by the nozzle is 0.7MPa, the concentration of the polyether block polysiloxane silicone oil is 5%, and the liquid carrying rate of the fiber is 8.0-9.0%;
the preparation of the polyether block polysiloxane silicone oil solution is that polyether block polysiloxane silicone oil is mixed with pure water and stirred evenly to prepare polyether block polysiloxane silicone oil solution with the concentration of 5 percent.
And the temperature of the relaxation heat setting is 130-150 ℃ and the time is 18min, wherein the temperature and the time of the drying zone are 130 ℃/12min, the temperature and the time of the setting zone are 150 ℃/6min, and the fiber of the setting machine is rapidly cooled to the room temperature.
The measured fiber linear density is 3.0dtex, the hollow rate is 21.2 percent, the crimp number is 7.0/25 mm, the crimp rate is 12.5 percent, the oil content is 0.32 percent, the moisture regain is 0.40 percent, and the fiber has soft hand feeling, good rebound resilience and fluffiness. When the fiber is used for rubbing balls, the balls are easier to form balls compared with the three-dimensional curled hollow silicon-added PET fiber with the same specification, and the rubbed balls are filled in pillows, toys and the like, so that the hand feeling is soft, and the rebound resilience is good.
The shape of the fiber is shown in fig. 1, and fig. 1 is a schematic view of the shape of the fine denier three-dimensional crimped hollow silicon-added PTT fiber prepared in example 1 of the present invention. As can be seen in fig. 1, the fine denier three-dimensional crimped hollow silicon-added PTT fiber produced by the present invention is crimped in shape.
At equivalent linear densities, the elastic recovery and Young's modulus of the PTT fibers were 22% and 22.0cN/dtex, respectively, while the PET fibers were 4% and 81.6cN/dtex, respectively. The Young modulus of the fiber is high, the rigidity of the fiber is high, and the hand feeling is hard. The Young's modulus of the fiber is small, and the hand feeling is soft. The young's modulus of PTT fibers is substantially the same as wool. In addition, after the fibers are added with silicon, the static and dynamic friction coefficients of the fibers are obviously reduced, which is helpful for improving the slippage and the flexibility of the fibers, but because the Young modulus of the base material PTT is obviously lower than that of PET, the three-dimensional curled hollow silicon-added PTT fibers have softer hand feeling than that of the three-dimensional curled hollow silicon-added PET.
Example 2
The preparation method of the fine denier three-dimensional curled hollow silicon-added PTT fiber with the nominal linear density of 3.33dtex multiplied by 32mm comprises the following steps:
and carrying out boiling drying, screw extrusion melting, spinning by using a special-shaped spinneret plate, carrying out asymmetric rapid cooling by circular blowing, winding and barrel dropping on the PTT slices to prepare precursor fibers, and carrying out post-spinning bundling, drafting, yarn stacking, curling, atomizing, silicon coating, cutting, relaxation heat setting, air conveying and packaging on the precursor fibers to obtain the fine-denier three-dimensional curled hollow silicon-added PTT fiber.
The melting point of the PTT slices is 228 ℃, and the intrinsic viscosity is 1.045 dl/g.
The temperature of the pre-crystallization and the drying of the PTT slices in the boiling drying process is 145 ℃, and the total time of the pre-crystallization and the drying process is 4.5 h.
The spinning temperature of the profile spinneret plate is 250-268 ℃, and the spinning speed is 1100 m/min.
The profile spinneret plate is a single C-shaped 2288 hole hollow spinneret plate, and the theoretical hollowness of the spinneret plate is 56.2%.
The asymmetric rapid cooling of the circular blowing air means that the air speed at the air outlet at the upper part of the circular blowing air is 4.0m/s, and the air temperature is 22-24 ℃.
The temperature of the oil tank for drafting is 60-62 ℃, the total drafting multiple is 2.42 times, and the highest speed of the third drafting machine is 160 m/min.
The step of atomizing and siliconizing refers to straightening the silk sheet after being taken out of the crimping machine, and atomizing polyether block polysiloxane silicone oil on the front surface and the back surface of the silk sheet respectively by using a single nozzle in a spray box, wherein the gauge pressure of compressed air used by the nozzle is 0.7MPa, the concentration of the polyether block polysiloxane silicone oil is 6%, and the liquid carrying rate of the fiber is 8.0-9.0%;
the preparation of the polyether block polysiloxane silicone oil solution is that polyether block polysiloxane silicone oil is mixed with pure water and stirred evenly to prepare polyether block polysiloxane silicone oil solution with the concentration of 6 percent.
And the temperature of the relaxation heat setting is 130-150 ℃ and the time is 15min, wherein the time of the drying zone is 130 ℃/10min, the time of the setting zone is 150 ℃/5min, and the fiber of the setting machine is rapidly cooled to the room temperature.
The measured fiber linear density is 3.83dtex, the hollow rate is 22.0 percent, the crimp number is 7.5/25 mm, the crimp rate is 14.5 percent, the oil content is 0.36 percent, the moisture regain is 0.43 percent, and the fiber has soft hand feeling, good rebound resilience and fluffiness. When the fiber is used for rubbing balls, the balls are easier to form balls than three-dimensional curled hollow silicon-added PET fibers, and the rubbed balls are filled in pillows, toys and the like, so that the hand feeling is soft, and the rebound resilience is good.
Example 3
The preparation method of the fine denier three-dimensional curled hollow silicon-added PTT fiber with the nominal linear density of 2.78dtex multiplied by 25mm comprises the following steps:
the nominal cut length in example 1 was changed to 25mm, and the fiber was more fluffy with the remaining conditions unchanged.
Actually measured fiber linear density of 3.00dtex, hollow rate of 21.2 percent, crimp number and crimp rate which cannot be detected due to short fiber, oil content of 0.32 percent, moisture regain of 0.41 percent and actual fiber length of 23.8mm, contact area between fibers is reduced due to short fiber length, and the fibers are fluffy.
Comparative example 1
Preparing fine denier three-dimensional curled hollow silicon-added PTT fiber:
the air speed at the air outlet at the upper part of the circular blowing in the embodiment 1 is adjusted to be more than 4.0m/s, the rest spinning processes are unchanged, the vibration of the filament output of the spinneret plate is serious along with the increase of the air speed, and partial filament bundles are sticky and cannot be spun.
Comparative example 2
Preparation of fine denier three-dimensional crimp hollow silicon-added PTT fiber
The spinning temperature in the example 2 is reduced to below 250 ℃, other processes are not changed, and after spinning for 2 hours, the spinneret plate gradually generates hard yarns, so that the spinning can not be carried out again.
Comparative example 3
Preparation of fine denier three-dimensional crimp hollow silicon-added PTT fiber
When the concentration of the polyether block polysiloxane silicone oil in example 2 was more than 6.0%, the nozzle was easily clogged with the increase in the concentration.
Comparative example 4
The PTT chips in example 1 were replaced with PET, the other process steps were unchanged, and the properties of the prepared fibers were:
the water content of the fiber is as high as 350ppm, and the fiber cannot be spun.
Comparative example 5
The atomization siliconizing step in example 1 was eliminated, the other method steps were unchanged, and the properties of the prepared fiber were:
the measured fiber linear density was 3.02dtex, the hollow rate was 21.2%, the crimp number was 7.4/25 mm, the crimp rate was 13.0%, the oil content was 0.04%, the moisture regain was 0.26%, and the fiber was static and could not be pelletized.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A fine denier three-dimensional crimp hollow silicon-added PTT fiber is characterized in that the PTT fiber is prepared from PTT slices and polyether block polysiloxane silicone oil solution, and the liquid carrying rate of the fiber is controlled when silicon is applied to the fiber;
the liquid carrying rate of the fiber is 8.0-9.0%.
2. The fine denier three-dimensional crimp hollow silicon-added PTT fiber according to claim 1, characterized in that the melting point of the PTT chip is 225-230 ℃, and the intrinsic viscosity is not lower than 1.000 dl/g.
3. The fine denier three-dimensional crimp hollow silicon-added PTT fiber according to claim 1, characterized in that the concentration of the polyether block polysiloxane silicone oil solution is 5-6%;
the liquid carrying rate of the fiber is calculated by dividing the weight difference between the weight of the polyether block polysiloxane silicone oil on the fiber and the weight of the polyether block polysiloxane silicone oil on the fiber before the polyether block polysiloxane silicone oil.
4. The fine denier three dimensional crimp hollow silicon added PTT fiber according to claim 1, characterized in that the nominal linear density of the fine denier three dimensional crimp hollow silicon added PTT fiber is 2.78 dtex-3.33 dtex, and the hollow rate of the fiber is more than or equal to 21.0%.
5. The fine denier three-dimensional crimp hollow silicon-added PTT fiber according to claim 1, characterized in that the measured fiber linear density of the fine denier three-dimensional crimp hollow silicon-added PTT fiber is 3.00 dtex-4.00 dtex, the crimp number is 7.0-8.5/25 mm, the crimp rate is 12.5-16.5%, the oil content is 0.32-0.36%, and the moisture regain is 0.4-0.43%.
6. A method of making the fine denier three-dimensional crimped hollow siliconized PTT fiber of any one of claims 1 to 5, comprising the steps of:
carrying out boiling drying, screw extrusion melting, spinning by a profiled spinneret plate, circularly blowing asymmetric rapid cooling, winding and barrel dropping on PTT slices to prepare precursor fibers, and carrying out post-spinning bundling, drafting, yarn stacking, curling, atomizing, silicon coating, cutting, relaxation heat setting, air conveying and bag forming on the precursor fibers to obtain the fine-denier three-dimensional curled hollow silicon-added PTT fibers;
the atomization siliconizing means that the silk sheet after being taken out of the crimping machine is straightened, polyether block polysiloxane silicone oil is atomized on the front surface and the back surface of the silk sheet in the spraying box respectively by using a single nozzle, the gauge pressure of compressed air used by the nozzle is 0.7MPa, the concentration of the silicone oil is 5-6%, and the liquid carrying rate of the fiber is 8.0-9.0%.
7. The preparation method of the fine denier three-dimensional crimp hollow silicon-added PTT fiber according to claim 6, characterized in that the temperature of pre-crystallization and drying of the PTT slices after boiling drying is 145 +/-3 ℃, and the total time of pre-crystallization and drying is more than or equal to 4.5 h.
8. The preparation method of the fine denier three-dimensional crimp hollow silicon-added PTT fiber according to claim 6, characterized in that the spinning temperature is 250-272 ℃, and the spinning speed is 1100-1150 m/min;
the special-shaped spinneret plate is a single C-shaped 2288-hole hollow spinneret plate, and the theoretical hollowness of the spinneret plate is 55-57%.
9. The preparation method of the fine denier three-dimensional crimp hollow silicon-added PTT fiber according to claim 6, characterized in that the ring-blowing asymmetric rapid cooling means that the wind speed at the air outlet at the upper part of the ring-blowing is 3.8-4.0 m/s, and the wind temperature is 22-24 ℃;
the temperature of the oil groove for drafting is 60 +/-2 ℃, the total drafting multiple is 2.28-2.82 times, and the highest speed of the third drafting machine is less than or equal to 160 m/min.
10. The preparation method of the fine denier three-dimensional crimp hollow silicon-added PTT fiber according to claim 6, characterized in that the temperature of the relaxation heat setting is 130-150 ℃ and the time is 15-18 min, wherein the time of the drying zone is 10-12 min and the time of the setting zone is 5-6 min.
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