CN118257029A

CN118257029A - Preparation method of composite functional moisture-absorbing sweat-releasing bicomponent filament yarn and fabric thereof

Info

Publication number: CN118257029A
Application number: CN202410314364.0A
Authority: CN
Inventors: 李刚; 孙诗锦; 彭明超; 周文龙; 于金超
Original assignee: Suzhou University
Current assignee: Suzhou University
Filing date: 2024-03-19
Publication date: 2024-06-28

Abstract

The invention provides a preparation method of a composite functional moisture-absorbing sweat-releasing bicomponent filament and a fabric thereof, which comprises the following steps: the PTT/PET double-component filament yarn is characterized in that the surface of the PTT/PET double-component filament yarn is provided with a moisture absorption coating, the PTT/PET double-component filament yarn is in a three-dimensional spiral shape, and the cross section of the PTT/PET double-component filament yarn is a special-shaped cross section; the invention improves the moisture permeability of the filaments by giving the bicomponent filaments a special-shaped cross-section morphology structure; the fabric is designed to form a difference on two sides of the fabric, one side of the fabric is flat, the other side of the fabric is provided with uneven meshes, the water absorption of the flat surface is greater than that of the concave-convex surface, so that a conduction pressure is generated, sweat can be quickly transferred from the concave-convex surface to the flat surface and evaporated, and quick drying is realized; the problem of poor hygroscopicity is solved by introducing polar groups such as hydroxyl, carboxyl and the like into the after-finishing of sericin. The modified master batch and the slices are blended in the melt spinning process to endow the bicomponent filament with cool feeling and antibacterial property, so that the bicomponent filament with a composite function is obtained.

Description

Preparation method of composite functional moisture-absorbing sweat-releasing bicomponent filament yarn and fabric thereof

Technical Field

The invention belongs to the technical field of clothing fabrics, and particularly relates to a composite functional moisture-absorbing sweat-releasing bicomponent filament and a preparation method of a fabric thereof.

Background

The bicomponent filament is a filament formed by extruding two different polymers through different spinning channels in a melt form and finally through the same spinneret plate, and the two components of the bicomponent filament have different heat shrinkage rates, so that the filament can form a three-dimensional spiral structure by heat treatment, thereby endowing the filament with excellent elasticity.

Most of the bicomponent filaments consist of PET and PTT or PBT, and the macromolecular chains of the bicomponent filaments lack hydrophilic polar groups, so that the bicomponent filaments have the main problem of poor hygroscopicity, which limits the application of the bicomponent filaments, and secondly, the bicomponent filament knitted fabric is easy to have uneven surface tension, so that the bicomponent filaments are less applied in the field of hygroscopic quick-drying clothing.

The invention discloses a coarse denier surface micro-porous hollow bi-component fiber, which solves the problem of poor hygroscopicity of conventional polyester, and solves the problem of poor water washing resistance of conventional polyester fabric after finishing the functions of the fabric, but has the advantages of complex preparation process, customized spinneret plate, requirement of using various raw materials for mixing to realize a hollow porous structure, direct influence of the ratio of the raw materials on the properties of the bi-component filament, high input cost, inapplicability to industrial production, and inapplicability to the application of moisture absorption and quick drying sportswear, quick drying clothing and the like in summer.

Disclosure of Invention

The invention aims to provide a composite functional moisture-absorbing sweat-releasing bicomponent filament and a preparation method of a fabric thereof, so as to solve the problems.

In order to solve the technical problems, the invention provides a composite functional moisture-absorbing sweat-releasing bicomponent filament, comprising: the PTT/PET double-component filament yarn is characterized in that a moisture absorption coating is arranged on the surface of the PTT/PET double-component filament yarn, the PTT/PET double-component filament yarn is in a three-dimensional spiral shape, and the cross section of the PTT/PET double-component filament yarn is a special-shaped cross section.

As a preferable scheme of the composite functional moisture-absorbing and sweat-releasing bicomponent filament, the moisture-absorbing coating is a mixed solution of glutaraldehyde and sericin solution.

As a preferable scheme of the composite functional moisture-absorbing sweat-releasing bicomponent filament, the outline of the special-shaped section is peanut-shaped.

As a preferable scheme of the composite functional moisture-absorbing sweat-releasing bicomponent filament, the PTT/PET bicomponent filament comprises raw materials including PTT slices, PET slices, jade master batches and zinc oxide, wherein the proportion of the PET slices to the jade master batches is 100:1 or 100:3.

The invention also provides a preparation method of the composite functional moisture-absorbing and sweat-releasing fabric, which comprises the preparation method of the PTT/PET bicomponent filaments and the weaving method of the fabric;

The preparation method of the PTT/PET bicomponent filament comprises a melt spinning process, a texturing process, a heat treatment process and a post finishing process;

The melt spinning process comprises a drying process, a heating process, a screw extrusion process, a filtering process, a metering process, a spinning process, a cooling process, a network process, a drawing process, an oiling process and a winding process;

the texturing process comprises a drawing process, a heating process, a cooling process, a false twisting process, a network process, an oiling process and a winding process;

The heat treatment process is to shrink the bicomponent filament by heating, and the difference of the heat shrinkage rates of the two components of the bicomponent filament leads to the formation of a three-dimensional helical structure of the bicomponent filament;

The finishing process combines sericin with the bi-component fabric through glutaraldehyde crosslinking agent.

As a preferable scheme of the preparation method of the composite functional moisture-absorbing and sweat-releasing fabric, two components of the bicomponent filament are fed and melted from two different melt spinning channels respectively and are combined and extruded at a spinneret plate.

As a preferable scheme of the preparation method of the composite functional moisture-absorbing and sweat-releasing fabric, the spinning process comprises spinning slices and modified master batches, and is suitable for compounding bicomponent filaments into bicomponent fibers.

As a preferable scheme of the preparation method of the composite functional moisture-absorbing and sweat-releasing fabric, the fabric is woven by PTT/PET bicomponent filaments, and one side of the fabric is flat, and the other side of the fabric is provided with holes.

As a preferable scheme of the preparation method of the composite functional moisture absorption and sweat releasing fabric, one side of the fabric is woven by a looping structure.

As a preferable scheme of the preparation method of the composite functional moisture absorption and sweat releasing fabric, the other side of the fabric is formed by alternately knitting a looping tissue and a tuck tissue.

Compared with the prior art, the invention has the beneficial effects that:

1. The bicomponent filament with the functions of moisture absorption and quick drying and other functions has multiple functions;

2. The bicomponent fiber has excellent elasticity;

3. The texturing process gives the knitted fabric better hand feeling and appearance;

4. the development of the moisture-absorbing and quick-drying fabric is realized by the special-shaped cross section, the sericin modification extracted from the waste water and the knitting structure design, and the environment-friendly and environment-friendly fabric is small.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein,

FIG. 1 is a process flow diagram of a melt spinning process of the present invention;

FIG. 2 is a process flow diagram of a texturing process;

FIG. 3 is a cross-sectional shape and surface morphology of the bicomponent filaments produced in example 1;

FIG. 4 is a cyclic stretch graph of the bicomponent filaments produced in example 1;

FIG. 5 is a cyclic stretch graph of the bicomponent filaments produced in example 2;

FIG. 6 is a comparison of infrared thermograms of the cool feeling modified bicomponent filaments produced in example 1 and the cool feeling modified bicomponent filaments produced in example 2;

FIG. 7 is a drawing showing the knitting pattern, a surface morphology electron microscope pattern and a knitting explanatory pattern of a fabric with moisture absorption and quick drying functions woven by using filaments produced in example 1 and example 2 as raw materials;

Fig. 8 is an experimental demonstration view of the water contact angle of the fabric woven in example 1 and example 2;

Fig. 9 is a graph showing the relationship between the amount of water evaporated and time in examples 1 and 2.

Wherein: 1. feeding into a storage bin; 2. a drying tower; 3. a heater; 4. a screw extruder; 5. a filter; 6. a metering pump; 7. a spinning assembly; 8. a ring blower; 9. a pre-network device; 10. a first drafting roller; 11. a second drafting roller; 12. a first oil tanker; 13. a winding device I; 14. an unwinding device; 15. drawing roller III; 16. a first hot box; 17. a cooling device; 18. a false twister; 19. a drawing roller IV; 20. a network device; 21. drawing roller five; 22. a second hot box; 23. a second oil tanker; 24. and a winding device II.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof.

First, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the following, the present invention will be described in detail by using a schematic structural diagram, etc., and in the detailed description of the embodiments of the present invention, for convenience of explanation, the schematic structural diagram showing the preparation method of a composite functional moisture-absorbing and sweat-releasing bicomponent filament and its fabric will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of the protection of the present invention. In addition, the three-dimensional space of length, width and depth should be included in actual fabrication.

Referring to fig. 3, fig. 3 is a cross-sectional shape and a surface morphology of the bicomponent filament produced in example 1. As shown in fig. 3, the present invention provides a composite functional moisture-absorbing and sweat-releasing bicomponent filament: comprising the following steps: the PTT/PET double-component filament yarn is characterized in that a moisture absorption coating is arranged on the surface of the PTT/PET double-component filament yarn, the PTT/PET double-component filament yarn is in a three-dimensional spiral shape, and the cross section of the PTT/PET double-component filament yarn is a special-shaped cross section. The moisture absorption coating is a sericin solution and glutaraldehyde crosslinking agent. The outline of the special-shaped section is peanut-shaped. The PTT/PET bicomponent filament comprises PTT slices, PET slices, jade master batch and zinc oxide,

The two components of the bicomponent filament are fed into the melt from two different melt spinning channels, respectively, and are extruded in combination at the spinneret. The spinning procedure comprises spinning slice and modified masterbatch, and is suitable for compounding the bicomponent filament into bicomponent fiber.

The fabric is woven by PTT/PET bicomponent filaments, and one side of the fabric is flat, and the other side of the fabric is provided with holes. One side of the fabric is woven by a loop forming tissue. The other side of the fabric is formed by alternately knitting a looping tissue and a tuck tissue.

Example 1

Referring to fig. 1, fig. 1 is a process flow chart of a melt spinning process according to the present invention. As shown in FIG. 1, PET chips having a viscosity of 0.68dl/g and a jade master batch having a cool feeling modifying function were blended at a ratio of 100:3, uniformly mixing and adding the mixture into a left feeding bin 1, and adding PTT slices with the viscosity of 0.5dl/g into a right feeding bin 2; drying the raw materials to 30ppm in a drying tower, heating the dried slices by a heater 3, extruding the slices from a screw extruder 2, wherein the temperature of the PET channel heater 3 is 270 ℃, and the temperature of the PTT channel heater 3 is 260 ℃; the temperature of the PET channel screw extruder 4 is 278, 280, 283, 287 and 292 ℃, the temperature of the PTT channel screw extruder 4 is 250, 255, 258, 261 and 262 ℃, the melt extruded from the screw extruder 4 is filtered by a filter 5, and the flow rate of the melt is controlled by a metering pump 6, so that the component ratio of the bicomponent filament PET and the PTT spun by a spinning component 7 is 6:4, a step of; The bicomponent filament spun by the spinning component is cooled by a circular blowing device 8, the cooling air temperature is 22 ℃, then the bicomponent filament is pre-networked by a pre-networking device 9, the pre-networking pressure is 0.65Pa, after the bicomponent filament is drawn by a first drawing roller 10 and a second drawing roller 11, the bicomponent filament is oiled by a first oil tanker 12 and then wound into a winding device 13, and 83D/36F pre-drawn filament can be obtained. The pre-drawn yarn obtained at this time has poor performance, the fabric woven by the pre-drawn yarn has poor hand feeling and rough surface, the utility value is not high, and the pre-drawn yarn also needs to be elasticized, and referring to fig. 2, fig. 2 is a process flow chart of an elasticizing process. As shown in fig. 2, the pre-drawn yarn obtained by melt spinning is unwound from an unwinding device 14, passes through a drawing roller three 15, is cooled by a first hot box 16 heating and cooling device 17, is false-twisted by a false twister 18, passes through a drawing roller four 19, can be controlled to 600m/min by the drawing roller four 19, can be adjusted to 1.06 in draft multiple by the speed ratio of the drawing roller three 15 to the drawing roller four 19, improves the performance of the pre-drawn yarn by inducing the crystallization orientation of the pre-drawn yarn by the heating treatment of the first hot box 16 and the drawing action of the drawing roller three 15 and the drawing roller four 19, and then is networked by a network device 20, The cohesion of the pre-drawn yarn is improved, the tension of the yarn in the network process is controlled through a drawing roller IV 19 and a drawing roller V21 in the network process, and then after the yarn is heat-set through a second heat box 22, the yarn is oiled through a second oil tanker 23 to adjust the winding tension and then is wound on a winding device 24, so that the stretch textured yarn is obtained. The obtained stretch textured yarn is placed in boiling water with the temperature of 95-100 ℃ for heat treatment for 15 minutes to obtain the PET/PTT bicomponent yarn with excellent elasticity. The bicomponent filament with the cool feeling and the moisture absorption quick-drying composite function is obtained, the breaking strength of the filament can reach 3.6cN/dtex, the elongation at break can reach 255 percent, and the elastic recovery rate of the filament can reach 95 percent after 6 times of cyclic stretching as shown in figure 5. The filament is used for weaving the mesh double-sided fabric, the front surface of the fabric is formed by uniformly distributed loops, the appearance is smooth, the back surface of the fabric is formed by alternately distributed tuck loops and floating threads, the appearance is uniformly distributed meshes, and the aim of quick drying is fulfilled by the structural difference of the two surfaces. As shown in FIG. 7, A is a weaving pattern of the moisture-absorbing and quick-drying fabric in the embodiment 1, wherein the first row and the third row are all formed by back surface looping, the second row and the fourth row are formed by front surface looping and evenly distributed back surface looping, and the second row and the fourth row looping are staggered, so that the back surface of the fabric presents evenly distributed meshes, and the front surface is formed by all loops, so that the front surface presents relatively flatness; b is a weaving pattern of the moisture-absorbing and quick-drying fabric in the embodiment 2, wherein the first row, the third row, the fifth row, the seventh row, the ninth row and the tenth row are formed by forming circles on the back surface, the second row, the fourth row and the sixth row are formed by forming circles on the front surface and collecting circles on the back surface, the positions of the circles on the back surface are the same, meshes similar to eyes are formed after the circles on the back surface of the third row and the circles on the back surface are separated, the eighth row, the tenth row and the twelfth row are the same, but the positions of the circles are staggered with the second row, the fourth row and the sixth row, so that the back surface of the fabric presents the meshes similar to eyes in uniform distribution, and the front surface is formed by forming circles on the whole, so that the front surface is relatively flat; Wherein C is a reverse looping symbol; d is a front looping symbol; e is a reverse face tuck symbol; then extracting silk fibroin solution from silk reeling waste liquid, concentrating the silk reeling waste liquid, performing suction filtration and centrifugation for three days to remove impurities, then dripping dilute hydrochloric acid into the waste liquid to adjust the pH value of the waste liquid to 3.9 to precipitate sericin, and then centrifuging at a speed of 10000r/min for 10 minutes to obtain sericin, mixing the bi-component fabric into the sericin solution containing 1% glutaraldehyde and 2g/L, wherein the bath ratio is 1:100, drying after twice soaking and twice padding, wherein the weight gain rate of the finished PTT/PET bi-component fabric is 15.8%, and F is a surface electron microscopic image of the mesh surface of the moisture absorption and quick drying fabric in example 1; G is an electron microscope image of the mesh surface of the moisture-absorbing and quick-drying fabric in example 2. As shown in fig. 8, fig. 8 is a graph showing the experimental results of the water contact angle of the fabric woven in example 1 and example 2. After dropping the drop, the fabric can absorb the drop within one second. As shown in fig. 9, fig. 9 is a graph showing the relationship between the amount of water evaporation and time in examples 1 and 2. The moisture in the fabric can be dried at a relatively high speed, the drying rate can reach 0.44g/h, the water absorption rate reaches 211%, the moisture diffusion time is 0.68s, the wicking height is 159mm, the moisture absorption and quick drying performance evaluation standard in national standard GB/T21655.1-2023 is reached, and the moisture absorption and quick drying grade of the fabric is 3, so that the fabric has excellent moisture absorption and quick drying performance. Referring to fig. 6, fig. 6 is an infrared thermogram comparison of the cool feeling modified bicomponent filaments produced in example 1 with the cool feeling modified bicomponent filaments produced in example 2. As shown in fig. 6, the infrared thermal image of example 1 has a more uniform heat distribution than that of example 2, indicating that the cooling effect is more excellent.

Example 2

PET chips having a viscosity of 0.68dl/g were mixed with an oxidation core having an antibacterial function at a ratio of 100:1, uniformly mixing and adding into a left feeding bin 1, and adding PTT slices with the viscosity of 0.5dl/g into a right feeding bin 2; drying the raw materials to 30ppm in a drying tower, heating the dried slices by a heater 3, extruding the slices from a screw extruder 2, wherein the temperature of the PET channel heater 3 is 270 ℃, and the temperature of the PTT channel heater 3 is 260 ℃; the temperature of the PET channel screw extruder 4 is 278, 280, 283, 287 and 292 ℃, the temperature of the PTT channel screw extruder 4 is 250, 255, 258, 261 and 262 ℃, the melt extruded from the screw extruder 4 is filtered by a filter 5, and the flow rate of the melt is controlled by a metering pump 6, so that the component ratio of the bicomponent filament PET and the PTT spun by a spinning component 7 is 6:4, a step of; The bicomponent filament spun by the spinning component is cooled by a circular blowing device 8, the cooling air temperature is 22 ℃, then the bicomponent filament is pre-networked by a pre-networking device 9, the pre-networking pressure is 0.65Pa, after the bicomponent filament is drawn by a first drawing roller 10 and a second drawing roller 11, the bicomponent filament is oiled by a first oil tanker 12 and then wound into a winding device 13, and 83D/36F pre-drawn filament can be obtained. The pre-drawn yarn obtained at this time has poor performance, the fabric woven by the pre-drawn yarn has poor hand feeling and rough surface, the utilization value is not high, the pre-drawn yarn obtained by melt spinning is unwound from an unwinding device 14 and is subjected to elasticizing treatment, after passing through a third drawing roller 15, is heated by a first hot box 16 and cooled by a cooling device 17, and then is subjected to false twisting by a false twister 18, and then is subjected to false twisting by a fourth drawing roller 19, the yarn bundle can be controlled to 600m/min by the fourth drawing roller 19, the draft multiple is adjusted to 1.06 by the speed ratio of the third drawing roller 15 to the fourth drawing roller 19, the crystallization orientation of the pre-drawn yarn is induced by the heating treatment of the first hot box 16 and the drafting action of the third drawing roller 15 and the fourth drawing roller 19, And then the pre-drawn yarn is subjected to network through a network device 20, the cohesion of the pre-drawn yarn is improved, the tension of yarn in the network process is controlled through a drawing roller IV 19 and a drawing roller V21 in the network process, and after the yarn is subjected to heat setting through a second heat box 22, the yarn is oiled through a second oil wheel 23 to adjust the winding tension and then is wound on a winding device 24, so that the stretch textured yarn is obtained. The obtained stretch textured yarn is placed in boiling water with the temperature of 95-100 ℃ for heat treatment for 15 minutes to obtain the PET/PTT bicomponent yarn with excellent elasticity. The bicomponent filament with the composite functions of antibiosis, moisture absorption and quick drying is obtained. The breaking strength of the filament can reach 3.4cN/dtex, the breaking elongation can reach 246%, and as shown in figure 4, the elastic recovery rate of the filament after five times of cyclic stretching can reach 91%. The mesh double-sided fabric is woven by the filaments, the upper machine diagram, the coil diagram and the surface morphology after weaving are shown in fig. 7, the front surface of the fabric is formed by uniformly distributed loops, the appearance is smooth, the back surface of the fabric is formed by alternately distributed tuck loops and floating yarns, the appearance is formed by uniformly distributed meshes, and the aim of quick drying is achieved through the structural difference of the two surfaces. Then extracting silk fibroin solution from silk reeling waste liquid, concentrating the silk reeling waste liquid, performing suction filtration and centrifugation for three days to remove impurities, then dripping dilute hydrochloric acid into the waste liquid to adjust the pH value of the waste liquid to 3.8 to precipitate sericin, and then centrifuging at a speed of 10000r/min for 10 minutes to obtain sericin, mixing the bi-component fabric into the sericin solution containing 1% glutaraldehyde and 1.5g/L, wherein the bath ratio is 1:100, the weight gain rate of the finished PTT/PET bi-component fabric is 12.6 percent after twice soaking and twice rolling and drying. The fabric has good moisture-conducting performance, and as shown in fig. 8, after dripping water drops, the fabric can absorb the water drops within one second. As shown in FIG. 9, the moisture in the fabric can be dried at a relatively high speed, the drying rate can reach 0.52g/h, the water absorption rate reaches 201%, the moisture diffusion time is 0.98s, the wicking height is 139mm, the moisture absorption rate reaches the national standard GB/T21655.1-2023, and the moisture absorption rate of the fabric is 3, which means that the fabric has excellent moisture absorption rate.

The specific working procedure of the invention is as follows: the spinning slice I and the modified master batch are required to enter a drying tower 2 through a feeding bin 1, are subjected to melt extrusion through a screw extruder 4 after being dried, then enter a filter 5 for filtration, the melt flow rate is controlled through a metering pump 6 after filtration, the slice II and the slice I are subjected to melt extrusion through different spinning channels and are sprayed out through a spinning assembly 7, filaments are formed after cooling through a circular blower 8, cohesion among the filaments is enhanced through a pre-net 9, the filaments are drawn through a drawing roller I10, and then the filaments are oiled through an oil wheel I12 to control winding tension in a subsequent winding process, and the pre-drawn filaments are obtained after winding through a winding device I13. Then, the pre-drawn yarn is elasticized, the pre-drawn yarn is unwound from a bobbin through an unwinding device 14, the pre-drawn yarn is drawn through a second drawing roller 11 and a third drawing roller 15, the pre-drawn yarn is heated and cooled through a first hot box 16 and a cooling device 17 in the drawing process, the temperature and the drawing are achieved through a fourth drawing roller 19 to induce the crystallization orientation of the pre-drawn yarn, then the pre-drawn yarn is false-twisted and networked through a false twister 18, a nether 20 and a fifth drawing roller 21, the stress of the bi-component filament is eliminated through secondary heating through a second hot box 22, the bi-component filament is oiled through a second oil wheel 23, and the pre-drawn yarn is wound onto the bobbin through a second winding device 24 to obtain the stretch textured yarn.

The invention carries out heat treatment on the stretch textured yarn to shrink the two components of the bicomponent filament to different degrees, thereby forming a three-dimensional spiral structure and endowing the bicomponent filament with excellent elasticity. And the modified masterbatch is added in the melt spinning process to blend and endow the bicomponent filament with a composite function, so that the moisture-absorbing quick-drying bicomponent filament with the composite function is obtained. The preparation method has relatively simple process, the bicomponent filament with the special-shaped section is obtained only through a specific spinneret plate, and then the bicomponent filament can obtain a composite function only by proportionally mixing modified master batches in a spinning slice, and the process flow and parameters of melt spinning are not required to be changed and adjusted. The filament yarn prepared by the method is finished by sericin extracted from silk reeling waste liquid after fabric design and weaving, has moisture absorption and quick drying functions and a compound function thereof under the triple effects of special-shaped cross section, fabric structure and sericin finishing, has a flat surface and an uneven surface of a knitted structure, is formed by uniformly distributed loops on the front surface of the fabric, has a flat appearance, is formed by alternately distributed loops and loops on the back surface of the fabric, has a uniformly distributed mesh on the appearance, and achieves the purpose of quick drying through the structural difference of the two surfaces.

It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.

Claims

1. A composite functional moisture absorbing and sweat releasing bicomponent filament comprising: the PTT/PET double-component filament yarn is characterized in that a moisture absorption coating is arranged on the surface of the PTT/PET double-component filament yarn, the PTT/PET double-component filament yarn is in a three-dimensional spiral shape, and the cross section of the PTT/PET double-component filament yarn is a special-shaped cross section.

2. A composite functional absorbent, breathable bicomponent filament according to claim 1, characterized by: the moisture absorption coating is a mixed solution of glutaraldehyde and sericin solution.

3. A composite functional absorbent, breathable bicomponent filament according to claim 2, characterized by: the outline of the special-shaped section is peanut-shaped.

4. A composite functional absorbent, breathable bicomponent filament according to claim 3, characterized by: the PTT/PET bicomponent filament comprises PTT slices, PET slices, jade master batches and zinc oxide, wherein the proportion of the PET slices to the jade master batches is 100:1 or 100:3.

5. A preparation method of a composite functional moisture-absorbing and sweat-releasing fabric is characterized by comprising the following steps: a process for the preparation of a PTT/PET bicomponent filament comprising the process according to any one of claims 1-4 and a process for braiding a facing;

the finishing process combines sericin with the bi-component filament fabric through glutaraldehyde crosslinking agent.

6. The method for preparing the composite functional moisture-absorbing and sweat-releasing fabric as claimed in claim 5, which is characterized in that: the two components of the bicomponent filaments are fed separately from two different melt spinning channels for melting and combined extrusion at the spinneret.

7. The method for preparing the composite functional moisture-absorbing and sweat-releasing fabric as claimed in claim 6, which is characterized in that: the spinning procedure comprises spinning slice and modified masterbatch, and is suitable for compounding the bicomponent filament into bicomponent fiber.

8. The method for preparing the composite functional moisture-absorbing and sweat-releasing fabric as claimed in claim 7, which is characterized in that: the fabric is woven by PTT/PET bicomponent filaments, and one side of the fabric is flat, and the other side of the fabric is provided with holes.

9. The method for preparing the composite functional moisture-absorbing and sweat-releasing fabric as claimed in claim 8, which is characterized in that: one side of the fabric is woven by a loop forming tissue.

10. The method for preparing the composite functional moisture-absorbing and sweat-releasing fabric as claimed in claim 9, which is characterized in that: the other side of the fabric is formed by alternately knitting a looping tissue and a tuck tissue.