CN116121908A - Cool feeling triangular skin core composite fiber for underwear fabric and preparation method thereof - Google Patents

Abstract

The invention discloses a cool sense triangle skin-core composite fiber for underwear fabric and a preparation method thereof, wherein the triangle skin-core composite fiber comprises a triangle core layer and a triangle skin layer sleeved outside the core layer, and the thickness ratio of the core layer to the skin layer is 4:1-2:1. The core layer in the composite fiber is a composite polymer, wherein the mass ratio of each component is as follows: 30% -50% of PA6 and 55% -70% of PET; the skin layer is a cool sense composite polymer, wherein the mass ratio of each component is as follows: 10-25% of PA6, 60-85% of HDPE and 10-15% of composite cool powder; the mass ratio of each component in the composite cool sense powder is as follows: 65 to 75 percent of nano-scale Mica powder, 25 to 37 percent of nano-scale AIN powder and 4 to 6 percent of silane coupling agent A171. The cool feeling triangular skin core fiber has the advantages of high elasticity, high air permeability, good cool feeling effect and relatively low cost, and is very suitable for being used as underwear fabric.

Description

Cool feeling triangular skin core composite fiber for underwear fabric and preparation method thereof

Technical Field

The invention relates to textile fibers, in particular to cool-feeling triangular skin-core composite fibers for underwear fabric and a preparation method thereof, and the multiple requirements of the underwear fabric on elasticity, color gorgeousness and cool-feeling comfort are better met by providing the skin-core composite fibers and the preparation method thereof.

Background

In recent years, with the continuous development of society, the living standard of people is gradually improved, and people do not simply meet the simple requirements of clothing and eating houses, but develop towards the directions of more environmental protection, health and comfort. Therefore, functional fabrics such as antibacterial fabrics and cool sense fabrics are greatly developed, wherein the cool sense fabrics can generate instant cool sense when being contacted with a human body, and simultaneously have the additional functions of absorbing sweat, quickly evaporating water and the like, and the prepared fabrics can effectively relieve the situation that people are stuffy and difficult to endure in summer, and are particularly suitable for being used as underwear fabrics for manufacturing underwear such as female bras and underpants.

Based on the development, underwear fabric using cool feeling fibers as fabric base materials appears in the industry, but the cool feeling fibers in the cool feeling fabric generally use pure HDPE as base materials, and are mixed with expensive AIN cool feeling powder, so that the fabric has high cost, the cool feeling powder is poorly dispersed in polymers, agglomerates are easily formed, the mechanical properties of the fibers are poor, the single HDPE base material has strong hydrophobicity, the air permeability and the comfort of the fabric are poor, and finally the cool feeling fabric is not suitable for being used as the underwear fabric.

In view of the foregoing, there is a need in the industry for a fiber suitable for use as an undergarment fabric that has a good cooling sensation.

Disclosure of Invention

The invention aims to provide cool feeling triangular skin core composite fiber for underwear fabric, which has low cost, good cool feeling effect and air permeability and elasticity, and a preparation method thereof.

In order to achieve the above purpose, the invention firstly discloses a cool sense triangle sheath-core composite fiber, wherein the sheath-core composite fiber is a composite fiber in which two polymers exist on the section of the same fiber, and the two polymers respectively form a sheath layer and a core layer continuously along the longitudinal direction of the fiber. The sheath-core composite fiber has the advantages that the defect of a single-component polymer can be overcome through a unique sheath-core structure, and the advantage complementation can be realized by combining the advantages of the two polymers, so that the sheath-core composite fiber has some unique properties, which cannot be realized by the single-component fiber.

The triangular sheath-core composite fiber consists of a triangular core layer and a triangular sheath layer sleeved outside the core layer, wherein the thickness ratio of the core layer to the sheath layer is 4:1-2:1; in the structure, the triangular core layer and the triangular skin layer are utilized to realize higher light reflectivity, and the reflection surfaces of the triangular core layer and the triangular skin layer are smooth and flat, so that the fibers are more glossy, and the underwear fabric prepared by the fibers is also more glossy.

In order to achieve better physical properties, the core layer in the triangular sheath-core composite fiber is a composite polymer, wherein the mass ratio of each component is as follows: 30% -50% of PA6 and 55% -70% of PET;

in order to achieve better physical properties and have good thermal conductivity to achieve the purpose of cool feeling, the cortex in the triangular sheath-core composite fiber is a cool feeling composite polymer, wherein the mass ratio of the components is as follows: 10-25% of PA6, 60-85% of HDPE and 10-15% of composite cool powder;

in order to achieve good cool feeling and control the overall cost, the composite cool feeling powder comprises the following components in percentage by mass: 65 to 75 percent of nano-scale Mica powder, 25 to 37 percent of nano-scale AIN powder and 4 to 6 percent of silane coupling agent A171.

Among the above materials, PA6 has excellent mechanical properties, eye-wetting properties and higher thermal conductivity.

PET as thermoplastic polyester has good crease resistance and shape retention, and has high strength and elastic recovery capability. It is durable and strong.

HDPE has the characteristics of higher human near infrared transmittance and high heat conduction performance, and is a preferable polymer matrix material for preparing cool feeling fibers.

The silane coupling agent A171 is a low molecular weight organic silicon compound with an amphoteric structure, and has a general formula of RSiX3. The X groups in the silane coupling agent molecules can react with the functional groups on the surfaces of the nano powder to form chemical bonds, so that the aggregation among the nano powder is reduced, the other part of R groups can react with the polymer chemically or physically wind, the silane coupling agent is used as a bridge to realize the connection between the nano powder and the polymer, the compatibility between the nano powder and the polymer is increased, the interface defect is reduced, and the comprehensive performance of the nano powder modified polymer is effectively improved

Mica is a group of silicate minerals with layered structures such as potassium, aluminum, magnesium, iron, lithium and the like. Mica is widely distributed on the earth, is one of minerals familiar in daily life, has a shape of a plurality of sheets or scales, is often polymerized together to form an aggregate, and can be peeled into soft and elastic slices with the thickness of 0.01-0.03 mm. The heat conductivity coefficient of Mica is 2.03W/(m.K), the surface of nano Mica is charged, the Mica after delamination has strong hydration, a layer of hydration film is easy to form, and water can be removed only at the temperature of more than 500 ℃, so that the Mica has high water content and strong water absorption. The Mica has stable chemical property, low price, wide sources and certain heat conductivity, water absorbability, adsorptivity and insulativity, is used for preparing the modified cool feeling powder of the cool feeling fiber, but the heat conductivity of the Mica is still different from that of certain powder with high heat conductivity, so that the effect of the prepared cool feeling fiber is not ideal.

AIN chinese name aluminum nitride, a covalent bond compound of hexagonal wurtzite structure with lattice parameters a=0.3114 nm and c= 0.4986 nm, in which each N atom or Al atom is in a tetrahedron consisting of four Al atoms or N atoms forming four Al-N bonds. Pure AlN appears bluish-white, typically gray or off-white. The theoretical heat conductivity of aluminum nitride can reach 320W/(m.K), but the heat conductivity of the actual product is about 150W/(m.K) due to impurities and defects in AlN. AlN has the characteristics of high volume resistivity, high insulation voltage resistance, high strength, high heat conductivity coefficient and the like, so that the AlN can be widely developed in the development of high-temperature-resistant, high-frequency, high-voltage and high-power electronic devices. Aluminum nitride ceramics have been commercially produced and widely used in the fields of integrated circuit insulating layers, protective layers, heat dissipating substrates, etc., but the higher price has limited their application.

In the composite polymer of the core layer, PA6 and PET are used for melt blending to prepare modified PET fiber, so that the elasticity of the core layer is enhanced, and the core layer also has a good heat conductivity coefficient.

In the cool polymer with the skin layer, HDPE is firstly used as a matrix, PA6 is used for being melted with the matrix to realize modification, and then composite cool powder is used for increasing the cool coefficient, so that a good cool effect is achieved.

In the composite cool powder, mica powder with low price is taken as a main body, AIN powder with better performance is taken as an auxiliary body,

after AIN and Mica powder are subjected to surface treatment by a silane coupling agent A171, three C, O, si elements and stretching vibration peaks representing Si-O bonds, C=C bonds and-CH 3 bonds appear in AlN powder; the SMica powder has a C element and a stretching vibration peak representing a C=C bond and a-CH 3 bond, and the silane coupling agent A171 has been successfully grafted to the surface of AlN and Mica powder. After the surface treatment of the silane coupling agent A171, the zeta potential absolute value of Mica and AlN powder is increased, the average particle size of Mica powder is changed from 460nm to 380nm, the average particle size of AlN powder is changed from 280nm to 230nm, the average particle size of nano powder is reduced, the particle size distribution is narrowed, and the agglomeration phenomenon is improved. The reason for the improved agglomeration phenomenon is that the Mica and AlN powder which are not subjected to surface treatment of the silane coupling agent are subjected to absolute ethyl alcohol dispersion treatment and are in an agglomerated form formed by a plurality of particles, and the agglomeration phenomenon is caused by the fact that the surface energy of the nano powder is high, and the particles are mutually attracted and aggregated to form the agglomeration. The proportion of the aggregates is obviously reduced and the proportion of the single particles is increased due to the fact that the surfaces of the Mica and AlN nano-powder are covered with vinyl groups after the surface treatment of the silane coupling agent A171, the repulsive property among the nano-particles is improved, and aggregation among the nano-particles can be effectively reduced. So that the agglomeration phenomenon between Mica and AlN powder is improved after the surface treatment of the silane coupling agent A171.

The invention also discloses a preparation method for producing the cool feeling triangle skin-core composite fiber, which comprises the following steps:

step one: preparing composite cool powder

Weighing the following components in mass: mixing Mica powder, AIN powder and silane coupling agent A171 in a container, adding proper amount of absolute ethanol, stirring for 15-45 min, adding formic acid during stirring, regulating pH to 3-5 to form solution A, adding silane coupling agent A171 into a container, adding proper amount of absolute ethanol, dispersing ultrasonic wave in the container for 30 min, and uniformly mixing silane coupling agent A171 with absolute ethanol to form solution B; pouring the solution A and the solution B into a container, stirring at the constant temperature of 55-65 ℃ for reaction for 100-200 minutes, evaporating the solvent after stirring to obtain Micat and AIN powder, drying the powder, grinding the powder to a state of less than 600 meshes, and taking the powder as cool sense powder for later use;

step two: composite polymer for preparing core layer

Weighing and preparing PA6 and PET materials according to the mass ratio, mixing and stirring the PA6 and the PET materials, and drying the mixture under the conditions of 85-90 ℃ and vacuum degree of-0.1 Mpa to ensure that the water content of the mixture is lower than 30ppm; heating the dried mixture to 235-270 deg.c in a double screw extruder to blend the mixture, extruding, heating the double screw extruder to ten sections, the temperatures are 120 ℃, 150 ℃, 160 ℃, 170 ℃, granulating after extrusion to obtain a composite polymer for standby;

step three: cool feeling composite polymer for preparing skin layer

Weighing and preparing PA6 and HDPE materials according to the mass ratio, mixing and stirring the PA6 and HDPE materials and the cool powder prepared in the step one, and drying under the condition that the temperature is 85-90 ℃ and the vacuum degree is-0.1 Mpa, so that the water content of the mixture is lower than 30ppm; heating the dried mixture to 180-220 ℃ in a double-screw extruder, extruding the mixture after melt blending, heating the double-screw extruder into ten areas at 130 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃ and 190 ℃ respectively, and granulating the extruded mixture to obtain a cool composite polymer for later use;

step four: preparation of sheath-core composite fiber

The preparation method comprises the steps of respectively feeding the prepared composite polymer and the cool-feeling composite polymer into corresponding spinning tanks after being fed into corresponding screw extruders, wherein each spinning tank is opposite to one metering pump, the two metering pumps respectively feed the two polymers into spinning components according to the mass ratio, in the operation, the two polymers are respectively heated and melted into independent fluids through the screw extruders, the screw extruders of the composite polymer are heated into four areas, the temperatures of the screw extruders of the composite polymer are 265 ℃, 270 ℃, 272 ℃ and 272 ℃, the screw extruders of the cool-feeling polymer are heated into four areas, the temperatures of the screw extruders of the cool-feeling polymer are 256 ℃, 260 ℃, 262 ℃ and 262 ℃, and the two fluids are respectively fed into the corresponding spinning tanks, wherein the two fluids are sprayed out through spinneret orifices after being converged at spinneret plates in the composite spinning components, and the preparation of the sheath-core composite fiber is completed through side blowing cooling, oiling, thermal traction and winding after the primary fiber is discharged from the composite spinning components.

Further, the spinneret orifices of the composite spinning assembly are equilateral triangles.

The cool feeling triangular skin core fiber has the advantages of high elasticity, high air permeability, good cool feeling effect and relatively low cost, and is very suitable for being used as underwear fabric.

Drawings

The invention is described in further detail below with reference to the attached drawing figures, wherein:

fig. 1 is a schematic view of the fiber structure of the present invention.

Detailed Description

For a further understanding of the invention, reference will now be made to the embodiments illustrated in the drawings, in which the invention is further described.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the disclosure, its application, or uses.

Example 1:

1. firstly, the mass ratio is as follows: 6.5 parts of Mica powder, 3 parts of AIN powder and 0.5 part of silane coupling agent A171 are reserved, the Mica powder and the AIN powder are both nanoscale powder, the two powder are put into a container together, 15 parts of absolute ethyl alcohol is added and stirred for 30 minutes by an electric stirrer, formic acid is added in the stirring process, the PH value of the mixture is regulated to 3 to form A liquid, and in synchronization with the operation, the silane coupling agent A171 is put into a container, 1 part of absolute ethyl alcohol is added, the container disperses ultrasonic waves for 30 minutes, and the silane coupling agent A171 and the absolute ethyl alcohol are uniformly mixed to form B liquid; pouring the solution A and the solution B into a container, stirring and reacting for 100 minutes at the constant temperature of 55 ℃ by using an electric stirrer, evaporating a solvent after stirring to obtain Micat and AIN powder, drying the powder, grinding the powder to a state of less than 800 meshes, and taking the powder as cool sense powder for later use;

2. weighing and preparing 40 parts of PA6 and 60 parts of PET according to the mass ratio, mixing and stirring the PA6 and the PET, and drying under the conditions of 90 ℃ and vacuum degree of-0.1 Mpa to ensure that the water content of the mixture is lower than 30ppm; heating the dried mixture to 265 ℃ in a double-screw extruder, extruding the mixture after melt blending, heating the double-screw extruder into ten areas at the temperatures of 120 ℃, 150 ℃, 160 ℃ and 170 ℃ respectively, and granulating the extruded mixture to obtain a composite polymer for later use;

3. weighing and preparing 10 parts of PA6 and 80 parts of HDPE material according to the mass ratio, mixing and stirring the PA6 and the HDPE material with 10 parts of cool powder prepared in the step one, and drying under the conditions of 90 ℃ and vacuum degree of-0.1 Mpa to ensure that the water content of the mixture is lower than 30ppm; heating the dried mixture to 205 ℃ in a double-screw extruder, extruding the mixture after melt blending, heating the double-screw extruder into ten areas at the temperatures of 130 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃ and 190 ℃ respectively, and cutting the extruded mixture into particles to obtain cool composite polymer for later use;

4. the prepared composite polymer and cool composite polymer are respectively sent into corresponding spinning tanks after being sent into corresponding screw extruders, each spinning tank is opposite to one metering pump, the two metering pumps send the two polymers into spinning components according to the mass ratio, in the operation, the two polymers are respectively heated and melted into independent fluids through the screw extruder, the screw rotating speed is 52 r/m, the screw extruder of the composite polymer is heated and divided into four areas, the temperature is 265 ℃, 270 ℃, 272 ℃ and 272 ℃, the screw extruder of the cool polymer is heated and divided into four areas, the temperature is 256 ℃, 260 ℃, 262 ℃ and 262 ℃, and the two fluids are respectively sent into corresponding spinning tanks, wherein the two fluids are respectively sprayed out through a spinneret hole after being converged at a spinneret plate in the composite spinning component, the primary fiber after being spun out of the composite spinning component is cooled through side blowing, oiling, hot traction and winding, and filament collecting, and the preparation of the sheath-core composite fiber is completed, the winding speed is 3000 m/min, and the thickness ratio of the sheath-core composite fiber is 4:1, and the cool-core composite fiber is obtained.

Example 2:

1. firstly, the mass ratio is as follows: 6 parts of Mica powder, 3.5 parts of AIN powder and 0.5 part of silane coupling agent A171 are reserved, the Mica powder and the AIN powder are both nanoscale powder, the two powder are put into a container together, 14 parts of absolute ethyl alcohol is added, then the mixture is stirred for 30 minutes by an electric stirrer, formic acid is added in the stirring process, the PH value of the mixture is regulated to 3, A liquid is formed, and in synchronization with the operation, the silane coupling agent A171 is put into a container, 1 part of absolute ethyl alcohol is added, the container disperses ultrasonic waves for 30 minutes, and the silane coupling agent A171 and the absolute ethyl alcohol are uniformly mixed to form B liquid; pouring the solution A and the solution B into a container, stirring and reacting for 100 minutes at the constant temperature of 55 ℃ by using an electric stirrer, evaporating a solvent after stirring to obtain Micat and AIN powder, drying the powder, grinding the powder to a state of less than 800 meshes, and taking the powder as cool sense powder for later use;

2. weighing and preparing 30 parts of PA6 and 70 parts of PET according to the mass ratio, mixing and stirring the PA6 and the PET, and drying under the conditions of 85 ℃ and vacuum degree of-0.1 Mpa to ensure that the water content of the mixture is lower than 30ppm; heating the dried mixture to 260 ℃ in a double-screw extruder, extruding the mixture after melt blending, heating the double-screw extruder into ten areas at the temperatures of 120 ℃, 150 ℃, 160 ℃, and 170 ℃ respectively, and granulating the extruded mixture to obtain a composite polymer for later use;

3. weighing and preparing 10 parts of PA6 and 80 parts of HDPE material according to the mass ratio, mixing and stirring the PA6 and the HDPE material with 10 parts of cool powder prepared in the step one, and drying under the conditions of 90 ℃ and vacuum degree of-0.1 Mpa to ensure that the water content of the mixture is lower than 30ppm; heating the dried mixture to 200 ℃ in a double-screw extruder, extruding the mixture after melt blending, heating the double-screw extruder into ten areas at the temperatures of 130 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃ and 190 ℃ respectively, and cutting the extruded mixture into particles to obtain cool composite polymer for later use;

4. the prepared composite polymer and cool composite polymer are respectively sent into corresponding spinning tanks after being sent into corresponding screw extruders, each spinning tank is opposite to one metering pump, the two metering pumps send the two polymers into spinning components according to the mass ratio, in the operation, the two polymers are respectively heated and melted into independent fluids through the screw extruder, the screw rotating speed is 52 r/m, the screw extruder of the composite polymer is heated and divided into four areas, the temperature is 265 ℃, 270 ℃, 272 ℃ and 272 ℃, the screw extruder of the cool polymer is heated and divided into four areas, the temperature is 256 ℃, 260 ℃, 262 ℃ and 262 ℃, and the two fluids are respectively sent into corresponding spinning tanks, wherein the two fluids are respectively sprayed out through a spinneret hole after being converged at a spinneret plate in the composite spinning component, the primary fiber after being spun out of the composite spinning component is cooled through side blowing, oiling, hot traction and winding, and filament collecting, and the skin-core composite fiber preparation is completed, the winding speed is 3000 m/min, and the temperature is 256 ℃, and the cool-core composite fiber is obtained, and the cool-core-sheath-core ratio is 4.

Example 3:

1. firstly, the mass ratio is as follows: 7 parts of Mica powder, 2.5 parts of AIN powder and 0.5 part of silane coupling agent A171 are reserved, the Mica powder and the AIN powder are nanoscale powder, the Mica powder and the AIN powder are put into a container together, 13 parts of absolute ethyl alcohol is added, then the mixture is stirred for 35 minutes by an electric stirrer, formic acid is added in the stirring process, the PH value of the mixture is regulated to 4, A liquid is formed, and in synchronization with the operation, the silane coupling agent A171 is put into a container, 1 part of absolute ethyl alcohol is added, the container disperses ultrasonic waves for 40 minutes, and the silane coupling agent A171 and the absolute ethyl alcohol are uniformly mixed to form B liquid; pouring the solution A and the solution B into a container, stirring and reacting for 150 minutes at the constant temperature of 55 ℃ by using an electric stirrer, evaporating a solvent after stirring to obtain Micat and AIN powder, drying the powder, grinding the powder to a state of less than 800 meshes, and taking the powder as cool sense powder for later use;

2. weighing and preparing 40 parts of PA6 and 60 parts of PET according to the mass ratio, mixing and stirring the PA6 and the PET, and drying under the conditions of 85 ℃ and vacuum degree of-0.1 Mpa to ensure that the water content of the mixture is lower than 30ppm; heating the dried mixture to 260 ℃ in a double-screw extruder, extruding the mixture after melt blending, heating the double-screw extruder into ten areas at the temperatures of 120 ℃, 150 ℃, 160 ℃, and 170 ℃ respectively, and granulating the extruded mixture to obtain a composite polymer for later use;

3. weighing 15 parts of PA6 and 75 parts of HDPE material according to the mass ratio, mixing and stirring the PA6 and the HDPE material with 10 parts of cool powder prepared in the step one, and drying the mixture under the conditions of 90 ℃ and vacuum degree of-0.1 Mpa, so that the water content of the mixture is lower than 30ppm; heating the dried mixture to 200 ℃ in a double-screw extruder, extruding the mixture after melt blending, heating the double-screw extruder into ten areas at the temperatures of 130 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃ and 190 ℃ respectively, and cutting the extruded mixture into particles to obtain cool composite polymer for later use;

4. the prepared composite polymer and cool composite polymer are respectively sent into corresponding spinning tanks after being sent into corresponding screw extruders, each spinning tank is opposite to one metering pump, the two metering pumps send the two polymers into spinning components according to the mass ratio, in the operation, the two polymers are respectively heated and melted into independent fluids through the screw extruder, the screw rotating speed is 52 r/m, the screw extruder of the composite polymer is heated and divided into four areas, the temperature is 265 ℃, 270 ℃, 272 ℃ and 272 ℃, the screw extruder of the cool polymer is heated and divided into four areas, the temperature is 256 ℃, 260 ℃, 262 ℃ and 262 ℃, and the two fluids are respectively sent into corresponding spinning tanks, wherein the two fluids are respectively sprayed out through a spinneret hole after being converged at a spinneret plate in the composite spinning component, the primary fiber after being spun out of the composite spinning component is cooled through side blowing, oiling, hot traction and winding, and filament collecting, and the skin-core composite fiber preparation is completed, the winding speed is 3000 m/min, and the core-core thickness ratio is 3:1 cool skin-core composite fiber is obtained.

The embodiments of the present specification have been described above, and the above description is illustrative, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the application is defined by the appended claims.

Claims (2)

1. The cool sense triangle skin core composite fiber for the underwear fabric is characterized in that: the composite material consists of a triangular core layer and a triangular skin layer sleeved outside the core layer, wherein the thickness ratio of the core layer to the skin layer is 4:1-2:1; the core layer is a composite polymer, wherein the mass ratio of each component is as follows: 30% -50% of PA6 and 55% -70% of PET; the skin layer is a cool sense composite polymer, wherein the mass ratio of each component is as follows: 10-25% of PA6, 60-85% of HDPE and 10-15% of composite cool powder; the mass ratio of each component in the composite cool sense powder is as follows: 65 to 75 percent of nano-scale Mica powder, 25 to 37 percent of nano-scale AIN powder and 4 to 6 percent of silane coupling agent A171.

2. The method for preparing the cool feeling triangle skin core composite fiber for the underwear fabric as claimed in claim 1, which is characterized in that: the method comprises the following steps:

step one: preparing composite cool powder

Weighing the following components in mass: mixing Mica powder, AIN powder and silane coupling agent A171 in a container, adding proper amount of absolute ethanol, stirring for 15-45 min, adding formic acid during stirring, regulating pH to 3-5 to form solution A, adding silane coupling agent A171 into a container, adding proper amount of absolute ethanol, dispersing ultrasonic wave in the container for 30 min, and uniformly mixing silane coupling agent A171 with absolute ethanol to form solution B; pouring the solution A and the solution B into a container, stirring at the constant temperature of 55-65 ℃ for reaction for 100-200 minutes, evaporating the solvent after stirring to obtain Micat and AIN powder, drying the powder, grinding the powder to a state of less than 600 meshes, and taking the powder as cool sense powder for later use;

step two: composite polymer for preparing core layer

Weighing and preparing PA6 and PET materials according to the mass ratio, mixing and stirring the PA6 and the PET materials, and drying the mixture under the conditions of 85-90 ℃ and vacuum degree of-0.1 Mpa to ensure that the water content of the mixture is lower than 30ppm; heating the dried mixture to 235-270 deg.c in a double screw extruder to blend the mixture, extruding, heating the double screw extruder to ten sections, the temperatures are 120 ℃, 150 ℃, 160 ℃, 170 ℃, granulating after extrusion to obtain a composite polymer for standby;

step three: cool feeling composite polymer for preparing skin layer

Weighing and preparing PA6 and HDPE materials according to the mass ratio, mixing and stirring the PA6 and HDPE materials and the cool powder prepared in the step one, and drying under the condition that the temperature is 85-90 ℃ and the vacuum degree is-0.1 Mpa, so that the water content of the mixture is lower than 30ppm; heating the dried mixture to 180-220 ℃ in a double-screw extruder, extruding the mixture after melt blending, heating the double-screw extruder into ten areas at 130 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃ and 190 ℃ respectively, and granulating the extruded mixture to obtain a cool composite polymer for later use;

step four: preparation of sheath-core composite fiber

The preparation method comprises the steps of respectively feeding the prepared composite polymer and the cool-feeling composite polymer into corresponding spinning tanks after being fed into corresponding screw extruders, wherein each spinning tank is opposite to one metering pump, the two metering pumps respectively feed the two polymers into spinning components according to the mass ratio, in the operation, the two polymers are respectively heated and melted into independent fluids through the screw extruders, the screw extruders of the composite polymer are heated into four areas, the temperatures of the screw extruders of the composite polymer are 265 ℃, 270 ℃, 272 ℃ and 272 ℃, the screw extruders of the cool-feeling polymer are heated into four areas, the temperatures of the screw extruders of the cool-feeling polymer are 256 ℃, 260 ℃, 262 ℃ and 262 ℃, and the two fluids are respectively fed into the corresponding spinning tanks, wherein the two fluids are sprayed out through spinneret orifices after being converged at spinneret plates in the composite spinning components, and the preparation of the sheath-core composite fiber is completed through side blowing cooling, oiling, thermal traction and winding after the primary fiber is discharged from the composite spinning components.

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