Core-sheath structure type anti-ultraviolet, anti-permeable and anti-perspiration polyamide fiber and preparation method thereof

Abstract

The invention relates to the field of synthetic fiber processing, in particular to a core-sheath structure type anti-ultraviolet, anti-permeable and anti-perspiration polyamide fiber and a preparation method thereof. The core-sheath structure type uvioresistant, anti-permeable and anti-perspiration polyamide fiber is composed of an inner core layer and an outer sheath layer, and the two layers are distributed in a concentric circle mode. And the mass ratio of the core layer to the sheath layer is (20-80): (40-60). According to the preparation method disclosed by the invention, the core layer of the chinlon 6 fiber has the high-content anti-ultraviolet and anti-transmission functional master batch, and the sheath layer is wrapped by conventional chinlon 6, so that the fiber presents an inner and outer double-layer structure, the reflection on ultraviolet rays is enhanced, light penetration is blocked, the anti-ultraviolet and anti-transmission functions of the fiber are excellent, and the anti-ultraviolet and anti-transmission functions of the fiber are improved. The anti-ultraviolet and anti-permeation functions of light and thin fabric in summer are met, meanwhile, the sweat stain resistance of the fabric is improved, high-content inorganic materials are concentrated on the inner layer, the smoothness degree of fibers on the surface layer is the same as that of conventional fibers, normal use of later weaving is not affected, economic benefits are good, and the application prospect is wide.

Description

Technical Field

[0001] The present invention relates to the field of synthetic fiber processing, and particularly to a core-sheath structured anti-ultraviolet, anti-transparency and anti-sweat stain polyamide fiber and a preparation method thereof. Background Art

[0002] The conditioned regain of polyamide is 4.5%, which has certain cool feeling characteristics and is the preferred cool material for summer skin clothes. Ultraviolet rays in summer are easy to burn human skin. Therefore, summer skin clothes need to have anti-ultraviolet function. For ultra-thin skin clothes with a weight per unit area of less than 60 g / m 2 Within, while ensuring the breathability of the clothing and having anti-ultraviolet function at the same time, the traditional method is to add anti-ultraviolet auxiliaries in the post-finishing of the fabric, which is not only expensive but also not wash-resistant.

[0003] When adding anti-ultraviolet auxiliaries during the polyamide spinning process, it is difficult to add a high content, the anti-ultraviolet function is average, and the introduction of anti-ultraviolet functional materials makes the surface of the fiber rougher, affecting the fiber quality and easily wearing nozzle and other equipment devices during the subsequent use process, and the fabric surface quality is also affected.

[0004] With the change of fashion trends, summer skin clothes not only need anti-ultraviolet function but also need to have anti-transparency function to avoid embarrassment caused by the inner layer showing through. Moreover, people tend to sweat easily during summer sports, and sweat stains are likely to appear on the fabric in an air-conditioned room, seriously affecting business or daily routines. Therefore, developing a summer skin clothes that can not only resist ultraviolet rays persistently but also prevent transparency and sweat stains has become an essential product for white-collar workers and other business people in the new era, and is also a product series urgently needed by major brand clothing. Summary of the Invention

[0005] The purpose of the present invention is to provide a core-sheath structured anti-ultraviolet, anti-transparency and anti-sweat stain polyamide fiber and a preparation method thereof in view of the deficiencies of the prior art. The core-sheath structured anti-ultraviolet, anti-transparency and anti-sweat stain polyamide fiber of the present invention is prepared by composite spinning. High-content anti-ultraviolet and anti-transparency functional materials are introduced into the core layer and wrapped with conventional polyamide. It has high-efficiency anti-ultraviolet and anti-transparency functions and is durable. The preparation method is simple and convenient, and mass production is easy, making the woven thin skin clothes have the functions of cool feeling, anti-ultraviolet, anti-transparency and anti-sweat stain integrated, and being deeply favored by summer close-fitting skin clothes.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A core-sheath structured anti-ultraviolet, anti-transparency and anti-sweat stain polyamide fiber, the core-sheath structured anti-ultraviolet, anti-transparency and anti-sweat stain polyamide fiber is composed of an inner core layer and an outer sheath layer wrapped around it, and the two layers are distributed in concentric circles; the mass ratio of the core layer to the sheath layer is 20-80:40-60;

[0008] The core layer comprises nylon 6 and an anti-ultraviolet and anti-permeation functional masterbatch with a mass ratio of 12-88:5-95; the sheath layer is nylon 6.

[0009] A preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain nylon fiber comprises the following steps:

[0010] Step 1: After extruding and melting the core layer and the sheath layer respectively, converging and spraying the filaments to eject concentrically to obtain nascent fibers;

[0011] Step 2: Subjecting the nascent fibers to suction, side blowing cooling, oiling and pre-network treatment in sequence to obtain knot-network fibers;

[0012] Step 3: After subjecting the knot-network fibers to drawing and main network treatment, forming a bobbin through wire guiding and winding processes; namely, nylon fibers.

[0013] Preferably, in Step 1, the specific process is as follows:

[0014] S1-1: Blending nylon 6 with the anti-ultraviolet and anti-permeation functional masterbatch, and drying online at a temperature of 80-120°C while maintaining the moisture content at 450-800 ppm to obtain the core layer; controlling the moisture content of nylon 6 at 300-600 ppm and the relative viscosity at 2.45-2.52, and slicing to obtain the sheath layer;

[0015] S1-2: After extruding and melting the core layer at 252-260°C and the sheath layer at 255-265°C, distributing, converging and spraying the filaments to eject concentrically to obtain nascent fibers.

[0016] In a further solution, the core layer is prepared by using a core layer assembly. In the core layer assembly, the size of the metal sand particles is 45-60 mesh, the size of the metal fine sand particles is 60-80 mesh, and the ratio of the metal coarse sand to the metal fine sand is 1-2:1-2; the metal sand filter screen in the core layer assembly is 5 layers of 20μ-5 layers of 30μ, and the filter screen on the spinneret plate is 5 layers of 20μ-5 layers of 30μ.

[0017] In a further solution, the sheath layer is prepared by using a sheath layer assembly. In the sheath layer assembly, the size of the metal sand particles is 60-80 mesh, the size of the metal fine sand particles is 100-120 mesh, and the ratio of the metal coarse sand to the metal fine sand is 1-2:1-2; the metal sand filter screen in the sheath layer assembly is 7 layers of 10μ-7 layers of 20μ, and the filter screen on the spinneret plate is 5 layers of 10μ-5 layers of 20μ.

[0018] Preferably, in Step 2, the pressure of the suction is 1.5-3.5 kg / cm 2; The parameters of the side blowing cooling are: temperature 17 - 19°C, humidity 92 - 95%, wind speed 0.4 - 0.5 m / s; the amount of oiling is 1.5% - 2.5%; the pressure of the pre-network treatment is 0.2 - 0.4 kg / cm 2 .

[0019] Preferably, in step 3, the drawing is performed using one stage with two groups of rollers. The temperature of one group of rollers is 10 - 30°C, the temperature of the other group of rollers is 145 - 160°C, and the drawing ratio is 1.15 - 1.45; the pressure of the main network treatment is 2.5 - 3.5 kg / cm 2 ; the wire guiding speed is 4500 - 4600 m / min; the winding speed is 4450 - 4550 m / min.

[0020] Preferably, the preparation process of the anti-ultraviolet and anti-permeation functional masterbatch is as follows:

[0021] S2-1: Under a nitrogen atmosphere, a surface treatment agent, titanium dioxide, silicon dioxide, and aluminum oxide are added to a 40 - 50 wt% ethanol aqueous solution, stirred at 45 - 55°C for 7 - 8 hours, and dried to obtain an anti-ultraviolet and anti-permeation material;

[0022] S2-2: The anti-ultraviolet and anti-permeation material and polyamide powder are mixed at 75 - 85°C for 30 - 40 min, cooled, extruded, and pelletized to obtain the anti-ultraviolet and anti-permeation functional masterbatch.

[0023] Preferably, in the raw materials of the anti-ultraviolet and anti-permeation material, the mass ratio of the surface treatment agent, titanium dioxide, silicon dioxide, and aluminum oxide is 0.05 - 0.1; 1 - 2:1 - 2:0.2 - 0.5;

[0024] In the raw materials of the anti-ultraviolet and anti-permeation functional masterbatch, the mass ratio of the anti-ultraviolet and anti-permeation material to the polyamide powder is 0.8 - 1.2:0.8 - 1.2.

[0025] Preferably, the preparation method of the surface treatment agent is as follows:

[0026] S3-1: By mass, under an argon atmosphere, 8 - 10 parts of 4,4-diaminobenzophenone, 3 - 4 parts of terephthalic acid, and 0.2 - 0.5 parts of zirconium tetrachloride are added to 50 - 60 parts of tetrahydrofuran, and reacted at 40 - 60°C for 5 - 7 hours to obtain intermediate product A;

[0027] S3-2: Add intermediate product A, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 3-[4-(2-oxiranylmethoxy)butoxy]-1,2-propanediol with a mass ratio of 4-5:2:2-2.5 to tetrahydrofuran, and react at 40-60 °C for 7-9 hours to obtain intermediate product B; add intermediate product B, menthol, and p-toluenesulfonic acid to toluene. The mass ratio of intermediate product B to menthol is 6-8:1-2. React at 130-150 °C for 10-30 min, wash and purify to obtain the surface treatment agent.

[0028] In the solution, the anti-ultraviolet and anti-permeation functional masterbatch obtained by treating the nanomaterial with the surface treatment agent and compounding according to a specific mass ratio can enhance the durability of the product against ultraviolet rays, sweat stain resistance, washability, anti-roughness, etc. during the product preparation process. At the same time, it also has anti-permeation performance and a cooling sensation, and is suitable for summer skin clothing.

[0029] Among them, titanium dioxide has strong ultraviolet absorption and scattering capabilities and is widely used in anti-ultraviolet fabrics. However, in actual applications, the binding force between titanium dioxide and the fabric is poor, and its chemical stability and wear resistance are also poor, which results in poor durability and washability in the prepared products. In addition, the dispersibility of titanium dioxide itself or with other nanomaterials is poor, and it is prone to agglomeration. There are also problems such as poor compatibility with the matrix during the masterbatch preparation process, and it cannot play an actual effect.

[0030] Therefore, to address the above problems, the surface treatment agent prepared by graft modification in this solution plays a key role: First, it can improve the dispersibility and solve the agglomeration problem; Second, based on the principle of similar solubility, it enhances the compatibility with polyamide powder during the masterbatch preparation process by utilizing the characteristic of the reaction between carboxyl groups and amino groups to form amide bonds; Third, by introducing benzophenone and siloxane, it significantly improves the durability of the product against ultraviolet rays, sweat stain resistance, and anti-roughness; Fourth, by introducing menthol and polyols, it enhances the hydrophilicity of the product, further improving the washability and cooling sensation.

[0031] On this basis, the surface treatment agent, titanium dioxide, silicon dioxide, and aluminum oxide are compounded according to a specific mass ratio to obtain the anti-ultraviolet and anti-permeation material. The three nanomaterials produce a synergistic effect, which not only further improves the anti-ultraviolet ability but also increases the difficulty of light penetration, greatly enhancing the anti-permeation performance of the product. In addition, this composite structure also significantly improves the wear resistance, washability, and anti-roughness of the product, effectively extending the service life of the product.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] (1) In the solution, a high-content anti-ultraviolet and anti-permeation material is fully introduced into the core layer, and the sheath layer is wrapped with a conventional nylon 6 material. The special structure of the inner and outer layers makes the anti-ultraviolet and anti-permeation functions of the fiber more excellent and durable. Moreover, by thickening the filter screen in the core layer and reasonably matching the processes, the service life of the components in the fiber spinning process can be greatly extended. At the same time, the sheath layer alleviates the mechanical properties of the whole fiber and avoids the wear of equipment devices such as nozzles during downstream use;

[0034] (2) This solution can make the anti-ultraviolet function of light fabrics with a weight of 60 g / m 2 or less meet UPF50+ and UVA<5%, solving the industry bottleneck;

[0035] (3) The composite spinning method is adopted in the solution, with a short production process and low cost, and the quality of the fiber meets the requirements of subsequent use;

[0036] (4) The anti-ultraviolet and anti-permeation functional masterbatch obtained by treating nano-materials with a surface treatment agent and compounding them according to a specific mass ratio is applied in the product preparation process, which can enhance the product's properties such as durable anti-ultraviolet, anti-sweat stain printing, wash resistance, and anti-roughness. At the same time, it also has anti-permeation performance and a cool feeling, and is suitable for summer skin clothing. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0038] Figure 1 is a schematic structural diagram of the core-sheath structured anti-ultraviolet, anti-permeation, and anti-sweat stain nylon fiber of the present invention;

[0039] Figure 2 is a schematic process flow diagram of the core-sheath structured anti-ultraviolet, anti-permeation, and anti-sweat stain nylon fiber of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0041] It should be noted that the following parts are parts by mass, and there are no special restrictions on the purchase manufacturers of all raw materials involved in the present invention. Exemplarily, in the following embodiments, the specification of silicon dioxide is 15 nm; the specification of titanium dioxide is 25 nm; the specification of aluminum oxide is 10 nm.

[0042] In the following examples, the core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber is composed of an internal core layer and an externally wrapped sheath layer, and the two layers are concentrically distributed; as Figure 1 shown.

[0043] The process of a preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber is roughly as Figure 2 shown, and specifically includes the following steps:

[0044] Example 1: A preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber, including the following steps:

[0045] Step 1: S1: By mass, in an argon atmosphere, add 9 parts of 4,4-diaminobenzophenone, 3.5 parts of terephthalic acid, and 0.4 part of zirconium tetrachloride to 55 parts of tetrahydrofuran, and react at 50 °C for 6 hours to obtain intermediate product A; S2: Add intermediate product A, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 3-[4-(2-epoxyethylmethoxy)butoxy]-1,2-propanediol with a mass ratio of 4.5:2:2.3 to tetrahydrofuran, and react at 50 °C for 8 hours to obtain intermediate product B; Add intermediate product B, menthol, and p-toluenesulfonic acid to toluene, and the mass ratio of intermediate product B to menthol is 7:1.5, and react at 140 °C for 20 min, wash and purify to obtain a surface treatment agent; S3: In a nitrogen atmosphere, add a surface treatment agent, titanium dioxide, silicon dioxide, and aluminum oxide with a mass ratio of 0.1:2:2:0.5 to a 45 wt% ethanol aqueous solution, stir at 50 °C for 8 hours, and dry to obtain an anti-ultraviolet and anti-permeation material; Mix the anti-ultraviolet and anti-permeation material and polyamide powder with a mass ratio of 1:1 at 80 °C for 35 min, cool, extrude, and pelletize to obtain an anti-ultraviolet and anti-permeation functional masterbatch;

[0046] Step 2: S1: Blend polyamide 6 with an anti-ultraviolet and anti-permeability functional masterbatch. The mass ratio of polyamide 6 to the anti-ultraviolet and anti-permeability functional masterbatch is 88:12. Keep the moisture at 300 ppm and dry it online at a temperature of 80 °C to obtain the core layer; Control the moisture of polyamide 6 at 300 ppm and the relative viscosity at 2.45 and then slice it to obtain the sheath layer; S2: Extrude and melt the core layer at 252 °C using a core layer assembly and a screw extruder. The size of the metal sand particles in the core layer assembly is 50 mesh, the size of the metal fine sand particles is 70 mesh, and the ratio of the metal coarse sand to the metal fine sand is 1:1. The metal sand filter in the core layer assembly is 5 layers of 20 μ, and the filter on the spinneret plate is 5 layers of 20 μ; S3: Extrude and melt the sheath layer at 255 °C using a sheath layer assembly and a screw extruder. The size of the metal sand particles in the sheath layer assembly is 70 mesh, the size of the metal fine sand particles is 110 mesh, and the ratio of the metal coarse sand to the metal fine sand is 1:1. The metal sand filter in the sheath layer assembly is 7 layers of 10 μ, and the filter on the spinneret plate is 5 layers of 10 μ; S4: After the core layer and the sheath layer are extruded and melted, they are evenly distributed to the box through a distribution pipe, and then metered by a metering pump and converge from their respective channels and are ejected together in a concentric circle from the spinneret holes. The mass ratio of the core layer to the sheath layer is 80:20 to obtain the nascent fiber;

[0047] Step 3: Subject the nascent fiber to monomer suction under a pressure of 1.5 kg / cm 2 Set the temperature at 17 °C, the humidity at 92%, and perform side blowing cooling at a wind speed of 0.4 m / s. Apply oil at an oil content of 1.5% and perform pre-network treatment under a pressure of 0.2 kg / cm 2 to obtain a knot-network fiber;

[0048] Step 4: Stretch and orient the knot-network fiber through a stretching roller. The stretching is carried out in one stage with two groups of rollers. The temperature of one group of rollers is 10 °C, and the temperature of the other group of rollers is 145 °C. The stretching ratio is 1.15; Subsequently, after performing main network treatment under a pressure of 2.5 kg / cm 2 guide the wire at a speed of 4500 m / min, and finally wind it at a speed of 4450 m / min to form a cake of silk; that is, polyamide fiber.

[0049] Example 2: A method for preparing a core-sheath structured anti-ultraviolet, anti-permeability, and anti-sweat polyamide fiber, comprising the following steps:

[0050] Step 1: S1: Under an argon atmosphere by mass parts, add 9 parts of 4,4-diaminobenzophenone, 3.5 parts of terephthalic acid, and 0.4 part of zirconium tetrachloride to 55 parts of tetrahydrofuran, and react at 50 °C for 6 hours to obtain intermediate product A; S2: Add intermediate product A, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 3-[4-(2-oxiranylmethoxy)butoxy]-1,2-propanediol with a mass ratio of 4.5:2:2.3 to tetrahydrofuran, and react at 50 °C for 8 hours to obtain intermediate product B; Add intermediate product B, menthol, and p-toluenesulfonic acid to toluene, and the mass ratio of intermediate product B to menthol is 7:1.5, react at 140 °C for 20 min, wash and purify to obtain a surface treatment agent; S3: Under a nitrogen atmosphere, add the surface treatment agent, titanium dioxide, silicon dioxide, and aluminum oxide with a mass ratio of 0.1:2:2:0.5 to a 45 wt% ethanol aqueous solution, stir at 50 °C for 8 hours, dry to obtain an anti-ultraviolet and anti-permeation material; Mix the anti-ultraviolet and anti-permeation material and polyamide powder with a mass ratio of 1:1 at 80 °C for 35 min, cool, extrude, and pelletize to obtain an anti-ultraviolet and anti-permeation functional masterbatch;

[0051] Step 2: S1: Blend polyamide 6 with the anti-ultraviolet and anti-permeation functional masterbatch, and the mass ratio of polyamide 6 to the anti-ultraviolet and anti-permeation functional masterbatch is 95:5. Keep the moisture at 600 ppm and dry online at a temperature of 120 °C to obtain the core layer; Control the moisture of polyamide 6 at 600 ppm and the relative viscosity at 2.52 and slice to obtain the sheath layer; S2: Extrude and melt the core layer at 260 °C using a core layer assembly and a screw extruder. The particle size of the metal sand in the core layer assembly is 50 mesh, the particle size of the metal fine sand is 70 mesh, and the ratio of the metal coarse sand to the metal fine sand is 2:1. The metal sand filter in the core layer assembly is 5 layers of 30 μ, and the filter on the spinneret is 5 layers of 30 μ; S3: Extrude and melt the sheath layer at 265 °C using a sheath layer assembly and a screw extruder. The particle size of the metal sand in the sheath layer assembly is 70 mesh, the particle size of the metal fine sand is 110 mesh, and the ratio of the metal coarse sand to the metal fine sand is 1:2. The metal sand filter in the sheath layer assembly is 7 layers of 20 μ, and the filter on the spinneret is 5 layers of 20 μ; S4: After the core layer and sheath layer are extruded and melted, they are evenly distributed to the box through a distribution pipe, and then metered by a metering pump and converge from their respective channels and spray out together in concentric circles from the spinneret holes. The mass ratio of the core layer to the sheath layer is 40:60 to obtain a nascent fiber;

[0052] Step 3: Subject the nascent fiber to monomer suction under a pressure of 3.5 kg / cm 2 Set the temperature at 19 °C, the humidity at 95%, and the wind speed at 0.5 m / s for side blowing cooling, apply oil at an oil content of 2.5%, and perform pre-network treatment under a pressure of 0.4 kg / cm 2 pressure to obtain a nodal network fiber;

[0053] Step 4: Stretch and orient the sectional network fibers through a drafting roller. The stretching is carried out in two groups of rollers in one stage. The temperature of one group of rollers is 20°C, and the temperature of the other group of rollers is 160°C. The stretching ratio is 1.45. Subsequently, after the main network treatment under a pressure of 3.5 kg / cm 2 pressure, the filaments are guided at a speed of 4600 m / min and finally wound at a speed of 4550 m / min to form a bobbin; that is, polyamide fibers.

[0054] Example 3: A method for preparing a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber, comprising the following steps:

[0055] Step 1: S1: By mass, in an argon atmosphere, 9 parts of 4,4-diaminobenzophenone, 3.5 parts of terephthalic acid, and 0.4 part of zirconium tetrachloride are added to 55 parts of tetrahydrofuran and reacted at 50°C for 6 hours to obtain intermediate product A; S2: Intermediate product A, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 3-[4-(2-epoxyethanylmethoxy)butoxy]-1,2-propanediol with a mass ratio of 4.5:2:2.3 are added to tetrahydrofuran and reacted at 50°C for 8 hours to obtain intermediate product B; Intermediate product B, menthol, and p-toluenesulfonic acid are added to toluene. The mass ratio of intermediate product B to menthol is 7:1.5, and the mixture is reacted at 140°C for 20 min, washed and purified to obtain a surface treatment agent; S3: In a nitrogen atmosphere, the surface treatment agent, titanium dioxide, silicon dioxide, and aluminum oxide with a mass ratio of 0.1:2:2:0.5 are added to a 45 wt% ethanol aqueous solution and stirred at 50°C for 8 hours, then dried to obtain an anti-ultraviolet and anti-permeation material; The anti-ultraviolet and anti-permeation material and polyamide powder with a mass ratio of 1:1 are mixed at 80°C for 35 min, cooled, extruded, and pelletized to obtain an anti-ultraviolet and anti-permeation functional masterbatch;

[0056] Step 2: S1: Blend polyamide 6 with an anti-ultraviolet and anti-permeation functional masterbatch. The mass ratio of polyamide 6 to the anti-ultraviolet and anti-permeation functional masterbatch is 90:10. Keep the moisture at 450 ppm and dry it online at a temperature of 100 °C to obtain the core layer. Control the moisture of polyamide 6 at 600 ppm and the relative viscosity at 2.48 and then slice it to obtain the sheath layer; S2: Extrude and melt the core layer at 258 °C using a core layer assembly and a screw extruder. The size of the metal sand particles in the core layer assembly is 50 mesh, the size of the metal fine sand particles is 70 mesh, and the ratio of the metal coarse sand to the metal fine sand is 1.5:1. The metal sand filter in the core layer assembly is 5 layers of 25 μ, and the filter on the spinneret plate is 5 layers of 25 μ; S3: Extrude and melt the sheath layer at 260 °C using a sheath layer assembly and a screw extruder. The size of the metal sand particles in the sheath layer assembly is 70 mesh, the size of the metal fine sand particles is 110 mesh, and the ratio of the metal coarse sand to the metal fine sand is 1:1.5. The metal sand filter in the sheath layer assembly is 7 layers of 15 μ, and the filter on the spinneret plate is 5 layers of 15 μ; S4: After the core layer and the sheath layer are extruded and melted, they are evenly distributed to the box through a distribution pipe, and then metered by a metering pump and converge through their respective channels and are ejected together in concentric circles from the spinneret holes. The mass ratio of the core layer to the sheath layer is 60:40 to obtain the nascent fiber;

[0057] Step 3: Carry out monomer suction on the nascent fiber under a pressure of 2.5 kg / cm 2 Set the temperature at 18 °C, the humidity at 94%, and carry out side blowing cooling at a wind speed of 0.45 m / s. Apply oil at an oil content of 2.0% and carry out pre-network treatment under a pressure of 0.3 kg / cm 2 to obtain the knot-network fiber;

[0058] Step 4: Draw and orient the knot-network fiber through a draw roll. The draw is carried out in one stage with two groups of rolls. The temperature of one group of rolls is 20 °C, and the temperature of the other group of rolls is 155 °C. The draw ratio is 1.35; Subsequently, carry out main network treatment under a pressure of 3.0 kg / cm 2 and guide the wire at a speed of 4550 m / min, and finally wind it at a speed of 4500 m / min to form a cake of yarn; that is, polyamide fiber.

[0059] Comparative Example 1: Purchase anti-ultraviolet polyamide fiber on the market, purchased from Hengshen Group, with a specification of FDY 15D-1500 / 12F-136F.

[0060] Comparative Example 2: Based on Example 1, use a silane coupling agent in the prior art as a surface treatment agent, and keep the rest of the process unchanged. Replace it with:

[0061] Step 1: Under a nitrogen atmosphere, a surface treatment agent (3-aminopropyltriethoxysilane), titanium dioxide, silicon dioxide, and aluminum oxide with a mass ratio of 0.1:2:2:0.5 are added to a 45 wt% ethanol aqueous solution, stirred at 50 °C for 8 hours, dried to obtain an anti-ultraviolet and anti-permeation material; an anti-ultraviolet and anti-permeation material and polyamide powder with a mass ratio of 1:1 are mixed at 80 °C for 35 min, cooled, extruded, and pelletized to obtain an anti-ultraviolet and anti-permeation functional masterbatch.

[0062] Comparative Example 3: Based on Example 1, without adding aluminum oxide, and the rest of the process remains unchanged, replaced with:

[0063] Step 1: S1: By mass fraction, under an argon atmosphere, 9 parts of 4,4-diaminobenzophenone, 3.5 parts of terephthalic acid, and 0.4 part of zirconium tetrachloride are added to 55 parts of tetrahydrofuran, and reacted at 50 °C for 6 hours to obtain intermediate product A; S2: Intermediate product A, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 3-[4-(2-epoxyethylmethoxy)butoxy]-1,2-propanediol with a mass ratio of 4.5:2:2.3 are added to tetrahydrofuran and reacted at 50 °C for 8 hours to obtain intermediate product B; Intermediate product B, menthol, and p-toluenesulfonic acid are added to toluene, and the mass ratio of intermediate product B to menthol is 7:1.5, and reacted at 140 °C for 20 min, washed and purified to obtain a surface treatment agent; S3: Under a nitrogen atmosphere, a surface treatment agent, titanium dioxide, and silicon dioxide with a mass ratio of 0.1:2:2 are added to a 45 wt% ethanol aqueous solution, stirred at 50 °C for 8 hours, dried to obtain an anti-ultraviolet and anti-permeation material; an anti-ultraviolet and anti-permeation material and polyamide powder with a mass ratio of 1:1 are mixed at 80 °C for 35 min, cooled, extruded, and pelletized to obtain an anti-ultraviolet and anti-permeation functional masterbatch.

[0064] Comparative Example 4: Based on Example 1, changing the mass ratio of the nanomaterials, and the rest of the process remains unchanged, replaced with:

[0065] Step 1: S1: Under an argon atmosphere by mass parts, add 9 parts of 4,4-diaminobenzophenone, 3.5 parts of terephthalic acid, and 0.4 part of zirconium tetrachloride to 55 parts of tetrahydrofuran, and react at 50 °C for 6 hours to obtain intermediate product A; S2: Add intermediate product A, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 3-[4-(2-oxiranylmethoxy)butoxy]-1,2-propanediol with a mass ratio of 4.5:2:2.3 to tetrahydrofuran, and react at 50 °C for 8 hours to obtain intermediate product B; Add intermediate product B, menthol, and p-toluenesulfonic acid to toluene, and the mass ratio of intermediate product B to menthol is 7:1.5, react at 140 °C for 20 min, wash and purify to obtain a surface treatment agent; S3: Under a nitrogen atmosphere, add a surface treatment agent, titanium dioxide, silicon dioxide, and aluminum oxide with a mass ratio of 0.1:1:3:2 to a 45 wt% ethanol aqueous solution, stir at 50 °C for 8 hours, and dry to obtain an anti-ultraviolet and anti-permeation material; Mix the anti-ultraviolet and anti-permeation material and polyamide powder with a mass ratio of 1:1 at 80 °C for 35 min, cool, extrude, and pelletize to obtain an anti-ultraviolet and anti-permeation functional masterbatch.

[0066] Performance detection: A core-sheath structured anti-ultraviolet, anti-permeation, and anti-sweat stain polyamide fiber prepared according to Example 4 has good anti-ultraviolet effect. In the UVA band with a wavelength of 320 - 400 nm, its transmittance is only 3.21%, and the ultraviolet protection coefficient is as high as UPF50+; in terms of anti-sweat stain performance, rated according to the standard of "GB / T 250-2008", the anti-sweat stain effect of this fiber reaches the 5th level.

[0067] Detection experiment: According to the standard of GB / T 18830—2002 "Evaluation of Ultraviolet Protection Performance of Textiles", the anti-ultraviolet performance of the core-sheath structured anti-ultraviolet, anti-permeation, and anti-sweat stain polyamide fibers of Example 1 and Comparative Examples 1 - 4 before and after 100 times of soaping was detected and compared to evaluate its influence on the anti-ultraviolet performance and durability of the fiber; the results are shown in Table 1;

[0068]

[0069] Table 1

[0070] Result analysis: It can be seen from the data analysis in Table 1 that a core-sheath structured anti-ultraviolet, anti-permeation, and anti-sweat stain polyamide fiber prepared by the method of the present invention incorporates a high-content anti-ultraviolet and anti-permeation functional material into the core layer, and the sheath layer wraps and plays a supporting role. The reasonable combination of the core and sheath enhances the ultraviolet reflection and shielding property, truly enabling the original fiber to have anti-ultraviolet function permanently, and at the same time having anti-permeation effect, avoiding the embarrassment caused by inner leakage, and avoiding sweat stain marks in summer when sweating easily, meeting the wearing experience of urban white-collar workers in the new era, leading a new round of revolution in summer skin clothing, and having an unlimited market application prospect.

[0071] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber, characterized in that: The core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber is composed of an internal core layer and an externally wrapped sheath layer, and the two layers are distributed in concentric circles; the mass ratio of the core layer to the sheath layer is 20-80:40-60; The core layer includes polyamide 6 and an anti-ultraviolet and anti-permeation functional masterbatch with a mass ratio of 12-88:5-95; the sheath layer is polyamide 6.

2. A preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber, characterized in that: It includes the following steps: Step 1: After extruding and melting the core layer and the sheath layer respectively, they are converged and spun out in concentric circles to obtain nascent fibers; Step 2: The nascent fibers are successively subjected to suction, side blowing cooling, oiling, and pre-network treatment to obtain knot-network fibers; Step 3: After the knot-network fibers are drawn and subjected to main network treatment, they are formed into a cake through wire guiding and winding processes; that is, polyamide fibers.

3. The preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber according to claim 2, wherein: In Step 1, the specific process is: S1-1: Polyamide 6 and an anti-ultraviolet and anti-permeation functional masterbatch are blended, and dried online at a temperature of 80-120°C while maintaining the moisture content at 450-800 ppm to obtain the core layer; the moisture content of polyamide 6 is controlled at 300-600 ppm and the relative viscosity is controlled at 2.45-2.52, and then sliced to obtain the sheath layer; S1-2: After extruding and melting the core layer at 252-260°C and the sheath layer at 255-265°C, they are distributed and converged and spun out in concentric circles to obtain nascent fibers.

4. The preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber according to claim 2, characterized in that: In Step 2, the pressure of the suction is 1.5 to 3.5 kg / cm 2 ; the parameters of the side air blowing cooling are: the temperature is 17 to 19 °C, the humidity is 92 to 95%, and the wind speed is 0.4 to 0.5 m / s; the amount of oiling is 1.5% to 2.5%; the pressure of the pre-network treatment is 0.2 to 0.4 kg / cm 2 .

5. The preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber according to claim 2, characterized in that: In Step 3, the drafting is performed using two groups of rollers in one stage. The temperature of one group of rollers is 10 - 30°C, and the temperature of the other group of rollers is 145 - 160°C. The drafting multiple is 1.15 - 1.

45. The pressure for the main network treatment is 2.5 - 3.5 kg / cm 2 ; the speed of the wire guiding is 4500 - 4600 m / min; the winding speed is 4450 - 4550 m / min.

6. The preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber according to claim 3, characterized in that: The preparation process of the anti-ultraviolet and anti-permeation functional masterbatch is: S2-1: Under a nitrogen atmosphere, a surface treatment agent, titanium dioxide, silicon dioxide, and aluminum oxide are added to a 40-50 wt% ethanol aqueous solution, stirred at 45-55°C for 7-8 hours, and dried to obtain an anti-ultraviolet and anti-permeation material; S2-2: The anti-ultraviolet and anti-permeation material and polyamide powder are mixed at 75-85°C for 30-40 min, cooled, extruded, and pelletized to obtain an anti-ultraviolet and anti-permeation functional masterbatch.

7. The preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber according to claim 6, characterized in that: In the raw materials of the anti-ultraviolet and anti-permeation material, the mass ratio of the surface treatment agent, titanium dioxide, silicon dioxide, and aluminum oxide is 0.05-0.1; 1-2:1-2:0.2-0.5; In the raw materials of the anti-ultraviolet and anti-permeation functional masterbatch, the mass ratio of the anti-ultraviolet and anti-permeation material to polyamide powder is 0.8-1.2:0.8-1.

2.

8. The preparation method of a core-sheath structured anti-ultraviolet, anti-permeation and anti-sweat stain polyamide fiber according to claim 7, characterized in that: The preparation method of the surface treatment agent is: S3-1: By mass, under an argon atmosphere, 8-10 parts of 4,4-diaminobenzophenone, 3-4 parts of terephthalic acid, and 0.2-0.5 parts of zirconium tetrachloride are added to 50-60 parts of tetrahydrofuran, and reacted at 40-60°C for 5-7 hours to obtain intermediate product A; S3-2: Intermediate product A, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 3-[4-(2-epoxyethyloxymethoxy)butoxy]-1,2-propanediol with a mass ratio of 4-5:2:2-2.5 are added to tetrahydrofuran, and reacted at 40-60°C for 7-9 hours to obtain intermediate product B; Intermediate product B, menthol, and p-toluenesulfonic acid are added to toluene, and the mass ratio of intermediate product B to menthol is 6-8:1-2, and reacted at 130-150°C for 10-30 min, washed and purified to obtain the surface treatment agent.

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