A high-transparency and color-developing nylon-polyester fiber with a special skin-core structure and its preparation method

Abstract

The present invention discloses a highly transparent and color - showing nylon - polyester fiber with a special skin - core structure and a preparation method thereof. The highly transparent and color - showing nylon - polyester fiber contains a coloring material, and the coloring material is located in the core layer. The base material of the skin layer is polyamide, and the base material of the core layer is polyester. The outer contour of the cross - section of the skin layer is circular, and the cross - section contour of the core layer is polygonal; the side length of the polygon is 0.2 - 0.6 times the radius of the circle, and the circumradius of the polygon is 1 / 4 - 1 / 2 times the radius of the circle; the light transmittance of the skin layer is above 95%; the preparation method is: adopting a skin - core composite structure spinning assembly, and using a bicomponent composite spinning technology to process the skin layer material and the core layer material into a highly transparent and color - showing nylon - polyester fiber with a special skin - core structure. The preparation method of the present invention is simple, and the obtained highly transparent and color - showing nylon - polyester fiber has a good color - showing effect, and at the same time has excellent three - dimensional sense and color saturation.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite fibers, and particularly relates to a high-transparency and color-displaying nylon-polyester fiber with a special skin-core structure and a preparation method thereof. Background Art

[0002] Differentiated fibers have always been the development direction of synthetic fiber technology. Improving the transparency of fibers can prepare fabric products with special visual effects, which have high market application value. At present, the core layer and the skin layer of the colored skin-core fibers on the market (such as CN101205641A) are mostly circular. The main purpose of making them into a skin-core structure is to protect the colored layer (core layer), enhance color fastness and prevent the migration of colored substances. Later, in order to increase the patterns of the skin-core colored fibers, orange-petal-shaped colored skin-core fibers were developed.

[0003] Generally speaking, the existing skin-core colored fibers mainly consider preventing the migration of substances in the colored layer, protecting the core layer, reducing the amount of the core layer (from the perspective of cost reduction), etc. For the existing skin-core fibers, the skin layer and the core layer can be clearly seen visually, and the color of the core layer cannot be fully highlighted due to the existence of the skin layer. Therefore, the visual effect brought by the skin-core fibers is not good.

[0004] Compared with ordinary nylon and polyester, the skin-core type nylon-polyester composite filament can combine the advantages of both. This fiber has both the strength and good stiffness of polyester, and the wear resistance, moisture absorption and soft handfeel of nylon. Summary of the Invention

[0005] In order to solve the problems existing in the prior art in the above background art, the present invention provides a high-transparency and color-displaying nylon-polyester fiber with a special skin-core structure and a preparation method thereof.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A high-transparency and color-displaying nylon-polyester fiber with a special skin-core structure contains a coloring material. The coloring material is located in the core layer. The base material of the skin layer is polyamide, and the base material of the core layer is polyester. The outer contour of the cross-section of the skin layer is circular, and the cross-section contour of the core layer is polygonal;

[0008] The side length of the polygon is 0.2-0.6 times the radius of the circle, and the circumradius of the polygon is 1 / 4-1 / 2 times the radius of the circle;

[0009] The light transmittance of the skin layer is above 95%.

[0010] The object of the present invention is to solve the problem that the color development effect of the color-developing nylon-polyester fiber with a skin-core structure in the prior art is poor. Specifically, the present invention solves this problem by reasonably designing the shape of the skin-core structure, the size of the core layer, and the light transmittance of the skin layer;

[0011] In the prior art, the outer contour of the cross-section of the skin layer and the cross-section contour of the core layer in the skin-core structure are both circular. The skin layer has no magnifying effect on the core layer, and the colored layer (core layer) cannot be highlighted. The obvious skin layer and core layer structures can be observed, which limits the good manifestation of the color of the colored layer. In the present invention, the outer contour of the cross-section of the skin layer is circular, and the cross-section contour of the core layer is polygonal. The area between the circle and the polygon is similar to a convex lens. Under the action of the convex lens, the light diverges and the wide angle increases. The color of the core layer is magnified. Visually, the core layer seems to fill the entire skin layer, so that the core layer (color layer) is fully highlighted. Now, taking the polygon as a triangle as an example, as Figure 1 shown, the area enclosed by the triangle and the circle is equivalent to three convex lenses. The convex lenses cause the incident light to diverge and increase the wide angle. With the refraction and scattering of the incident light and the spatial resolution ability of the human eye, the core layer can show better three-dimensional sense and color saturation;

[0012] If the side length of the polygon of the core layer is too short, a good convex lens area cannot be formed between the side of the polygon and the outer surface circle of the skin layer, and the magnifying effect on the core layer will be weakened, affecting the highlighting of the color layer. Also, because this skin-core fiber is prepared by a melt spinning process, both the skin layer and the core layer have undergone a certain degree of drawing. The drawing degree of the skin layer is often greater than that of the core layer. During the drawing process, as the skin layer is continuously drawn, the fiber gradually becomes thinner and the thickness of the skin layer decreases. If the side length of the polygon of the core layer is too long, the core layer may be exposed to the fiber surface due to the drawing effect, damaging the skin-core structure. The size of the circumscribed circle radius of the polygon of the core layer determines the size of the core layer. If the circumscribed circle radius of the core layer is too small, the distance between the polygon of the core layer and the surface circle of the skin layer is too large, and the color of the core layer cannot be well diverged, failing to achieve the purpose of magnifying the core layer. If the radius of the inscribed circle of the core layer is too large, the area between the side of the polygon of the core layer and the surface circle of the skin layer is too small, and it cannot play a good magnifying role on the core layer. At the same time, if the core layer is too large, the core layer may be exposed during the drawing process, damaging the skin-core structure.

[0013] The light transmittance of the skin layer should not be too low, otherwise it will affect the expression of the color of the core layer and the color saturation.

[0014] As a preferred technical solution:

[0015] For the high-transparency color-developing nylon-polyester fiber with a special skin-core structure as described above, the polygon is a regular polygon to ensure that the magnifying effect of the skin layer on the core layer is uniform in different directions. After the magnifying effect of the convex lens structure area between the skin layer and the core layer, the color layer (core layer) can be highlighted from all directions.

[0016] A high-transparency and color-developing nylon-polyester fiber with a special skin-core structure as described above, wherein the coloring material is an inorganic pigment or an organic pigment, and the content of the coloring material in the core layer is 2-5 wt%, so as to avoid a sharp increase in viscosity caused by too high a content of the coloring material and difficult spinning.

[0017] A high-transparency and color-developing nylon-polyester fiber with a special skin-core structure as described above, wherein the skin layer contains 6-8 wt% of a nano-nucleating agent. The nano-nucleating agent can make the easily crystallizable polyamide form small spherulites, reduce the density of crystal nuclei, hinder the accumulation of crystal nuclei, further improve transparency, and achieve high light transmittance. The nano-nucleating agent is composed of an organic nano-nucleating agent and an inorganic nano-nucleating agent with a mass ratio of 5-8:1.

[0018] A high-transparency and color-developing nylon-polyester fiber with a special skin-core structure as described above, wherein the inorganic nano-nucleating agent is barium sulfate, and the organic nano-nucleating agent is a polyester polyol or a calcium salt nucleating agent.

[0019] A high-transparency and color-developing nylon-polyester fiber with a special skin-core structure as described above, wherein the skin layer contains 2-5 wt% of an organosilicon light diffusing agent. The function of the organosilicon light diffusing agent is to make the light source refract in a penetrating manner, change the traveling route of the light, achieve the effect of uniform light and light transmission, weaken the disadvantage of glare existing in the nylon itself, and improve the three-dimensional sense of the colored core layer.

[0020] A high-transparency and color-developing nylon-polyester fiber with a special skin-core structure as described above, wherein the core layer contains 5-8 wt% of a styrene maleic anhydride esterified product, and the skin layer contains 5-10 wt% of a styrene maleic anhydride esterified product. All the styrene maleic anhydride esterified products are cross-linked with each other, so that the polyester and polyamide components are connected by covalent bonds, solving the problem of poor compatibility between nylon and polyester.

[0021] A high-transparency and color-developing nylon-polyester fiber with a special skin-core structure as described above, wherein the mass ratio of the core layer in the fiber is 10-20%, the polyamide is PA6, the intrinsic viscosity of the polyamide is 2.4-2.6 dL / g, and the intrinsic viscosity of the polyester is 0.67-0.68 dL / g.

[0022] The present invention also provides a method for preparing a high-transparency and color-developing nylon-polyester fiber with a special skin-core structure as described in any one of the above, using a skin-core composite spinning component, and processing the skin layer material and the core layer material into a high-transparency and color-developing nylon-polyester fiber with a special skin-core structure by using a two-component composite spinning technology.

[0023] As a preferred technical solution:

[0024] In the method described above, during the processing, the temperature of each zone of the screw extruder corresponding to the core layer material is 260 - 290 °C, the temperature of each zone of the screw extruder corresponding to the skin layer material is 250 - 290 °C, the side blowing temperature is 20 - 30 °C, the side blowing speed is 0.35 - 0.55 m / s, and the side blowing humidity is 70 ± 5%. Such setting of process parameters is beneficial to preventing the coloring material from migrating from the core layer to the skin layer.

[0025] Beneficial effects:

[0026] (1) With the aid of a special skin-core structure design, the present invention designs a high-transparency and color-displaying nylon-polyester composite filament by using the composite melt spinning technology, meeting the requirements of prominent core layer color, high color saturation, and high color uniformity, improving the color fastness and use safety of the colored fiber, and the overall preparation method is simple.

[0027] (2) By utilizing the differences in light refraction and scattering, the present invention improves the color-displaying effect of the core layer, enhances the color uniformity and three-dimensional sense of the core layer. Through the special structure between the polygonal sides of the core layer and the outer surface circle of the skin layer, the core layer is magnified, and the thickness of the skin layer is visually weakened. When observing, it seems that the core layer is on the surface of the fiber, which is more conducive to the manifestation of its color. At the same time, adding nano nucleating agent and silicone light diffusing agent can reduce the crystal nucleus density and improve the transparency of the skin layer, modify the skin layer polyamide, and enhance the light scattering effect by using the diffusing agent and the special structure between the skin layer and the core layer, thereby weakening the glare generated by the polyamide and ensuring more comfortable vision when the colored fiber enters the eye. Description of the drawings

[0028] Figure 1 It is a schematic cross-sectional structure diagram of the fiber prepared in Example 1 of the present invention; in the figure, the black equilateral triangle inside the circle is the core layer, and the area inside the circle except the equilateral triangle is the skin layer. Specific embodiments

[0029] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0030] In the embodiment, the detection method of the light transmittance of the skin layer is as follows: A film with a length × width × thickness of 50 mm × 50 mm × 0.1 mm is prepared separately from the skin layer material for light transmittance testing, and the detection is carried out with reference to the standard GB / T 2410 - 2008. The specific testing method is implemented according to the standard.

[0031] Example 1

[0032] A preparation method of high-transparency and color-developing nylon-polyester fiber with a special skin-core structure is as follows:

[0033] (1) Prepare materials:

[0034] Skin layer substrate: PA6, with an intrinsic viscosity of 2.45 dL / g;

[0035] Core layer substrate: PET, with an intrinsic viscosity of 0.67 dL / g;

[0036] Coloring material: red masterbatch, manufactured by Changzhou Longma High Polymer Technology Co., Ltd., model NR008 red;

[0037] Nano nucleating agent: composed of barium sulfate and long-chain calcium carboxylate (manufactured by Shanghai Kayin Chemical Industry, brand Licomont Cav102) with a mass ratio of 5:1;

[0038] Organic silicon light diffusing agent: polymethylsilsesquioxane, manufactured by Yuheng Technology, product number HY-7150;

[0039] Styrene maleic anhydride esterified product: Shenzhen Yingqun Chemical Industry, brand XIRAN1440;

[0040] (2) Prepare the skin layer material and the core layer material respectively:

[0041] The skin layer material is composed of the skin layer substrate, nano nucleating agent, organic silicon light diffusing agent and styrene maleic anhydride esterified product;

[0042] The core layer material is composed of the core layer substrate, coloring material and styrene maleic anhydride esterified product;

[0043] (3) Spinning:

[0044] Adopt a skin-core composite structure spinning assembly, and use the two-component composite spinning technology to process the above-mentioned skin layer material and core layer material into high-transparency and color-developing nylon-polyester fiber with a special skin-core structure;

[0045] During the processing: the temperatures of each zone of the screw extruder corresponding to the core layer material are 260 °C in zone 1, 270 °C in zone 2, 285 °C in zone 3, 290 °C in zone 4, 290 °C in zone 5, and the temperatures of each zone of the screw extruder corresponding to the skin layer material are 250 °C in zone 1, 265 °C in zone 2, 280 °C in zone 3, 285 °C in zone 4, 290 °C in zone 5, the side blowing temperature is 20 °C, the side blowing speed is 0.35 m / s, and the side blowing humidity is 70%.

[0046] The finally obtained high-transparency and color-developing nylon-polyester fiber with a special skin-core structure is as Figure 1As shown, the outer contour of the cross-section of the skin layer is circular, and the cross-section contour of the core layer is an equilateral triangle; the side length of the equilateral triangle is 0.58 times the radius of the circle, and the circumradius of the equilateral triangle is 1 / 3 times the radius of the circle; the proportion of the core layer mass in the fiber is 12.4%; the content of the coloring material in the core layer is 2 wt%, and the content of styrene maleic anhydride ester is 5 wt%; the content of the nano-nucleating agent in the skin layer is 8 wt%, the content of the silicone light diffusing agent is 4 wt%, and the content of styrene maleic anhydride ester is 5 wt%; the light transmittance of the skin layer is 96.2%.

[0047] For the high-transparency color-developing nylon-polyester fiber with a special skin-core structure prepared in this example, no obvious skin layer structure can be observed under natural light, and there is no glare; if the core layer is circular and the radius is the same as the circumradius of the core layer in this example, then the color layer (core layer) cannot be highlighted under natural light, an obvious skin layer structure can be observed, and there is a glare.

[0048] After weaving the high-transparency color-developing nylon-polyester fiber with a special skin-core structure into a fabric, the K / S value is measured (the K / S value is the surface color concentration, and the larger the value, the darker the color on the fabric surface). At the same time, a comparative sample is woven into a fabric with the same specifications and organizational structure and the K / S value is measured. The raw materials and dosages of the comparative sample and the high-transparency color-developing nylon-polyester fiber with a special skin-core structure are the same, and the only difference is the shape of the core layer. The shape of the core layer of the comparative sample is circular. The test results show that the fabric prepared from the fiber described in Example 1 has a K / S increase of 86.4% compared with the comparative sample.

[0049] Example 2

[0050] A preparation method of a high-transparency color-developing nylon-polyester fiber with a special skin-core structure is as follows:

[0051] (1) Prepare materials:

[0052] Skin layer substrate: PA6, with an intrinsic viscosity of 2.4 dL / g;

[0053] Core layer substrate: PET, with an intrinsic viscosity of 0.67 dL / g;

[0054] Coloring material: red masterbatch, manufacturer: Changzhou Longma High Polymer Technology Co., Ltd., model: NR008 red;

[0055] Nano-nucleating agent: composed of barium sulfate and calcium arylsulfonate (manufacturer: Guangzhou Yinuo Chemical Industry, brand: JYN645) with a mass ratio of 5:1;

[0056] Silicone light diffusing agent: polymethylsilsesquioxane, manufacturer: Yuheng Technology, product number: HY-7150;

[0057] Styrene maleic anhydride ester: Shenzhen Yingqun Chemical Industry, brand: XIRAN1440;

[0058] (2) Configure the skin layer material and the core layer material respectively:

[0059] The skin layer material consists of a skin layer substrate, a nano nucleating agent, an organosilicon light diffusing agent, and a styrene maleic anhydride ester;

[0060] The core layer material consists of a core layer substrate, a coloring material, and a styrene maleic anhydride ester;

[0061] (3) Spinning:

[0062] Adopt a skin-core composite structure spinning assembly, and use the two-component composite spinning technology to process the above-mentioned skin layer material and core layer material into high-transparency and color-developing nylon-polyester fibers with a special skin-core structure;

[0063] During the processing: the temperature of each zone of the screw extruder corresponding to the core layer material is 260 °C in zone 1, 270 °C in zone 2, 285 °C in zone 3, 290 °C in zone 4, and 290 °C in zone 5; the temperature of each zone of the screw extruder corresponding to the skin layer material is 250 °C in zone 1, 265 °C in zone 2, 280 °C in zone 3, 285 °C in zone 4, and 290 °C in zone 5; the side blow air temperature is 20 °C, the side blow air speed is 0.35 m / s, and the side blow air humidity is 75%.

[0064] The finally obtained high-transparency and color-developing nylon-polyester fibers with a special skin-core structure have a circular cross-sectional outer contour of the skin layer and a regular triangular cross-sectional contour of the core layer; the side length of the regular triangle is 0.87 times the radius of the circle, and the circumradius of the regular triangle is 1 / 2 times the radius of the circle; the proportion of the core layer quality in the fiber is 16.3%; the content of the coloring material in the core layer is 2 wt%, and the content of the styrene maleic anhydride ester is 8 wt%; the content of the nano nucleating agent in the skin layer is 8 wt%, the content of the organosilicon light diffusing agent is 2 wt%, and the content of the styrene maleic anhydride ester is 8 wt%; the light transmittance of the skin layer is 95.5%.

[0065] For the high-transparency and color-developing nylon-polyester fibers with a special skin-core structure obtained in this example, no obvious skin layer structure can be observed under natural light, and there is no glare; if the core layer is circular and the radius is the same as the circumradius of the core layer in this example, then the color layer (core layer) cannot be highlighted under natural light, an obvious skin layer structure can be observed, and there is a glare.

[0066] After weaving the high-transparency and color-developing nylon-polyester fibers with a special skin-core structure into a fabric, the K / S value is measured. At the same time, a contrast sample is woven into a fabric with the same specifications and organizational structure and the K / S value is measured. The raw materials and dosages of the contrast sample and the high-transparency and color-developing nylon-polyester fibers with a special skin-core structure are the same, and the only difference is the shape of the core layer. The shape of the core layer of the contrast sample is circular. The test results show that the fabric made of the fibers described in Example 2 has a K / S value increased by 85.6% compared with the contrast sample.

[0067] Example 3

[0068] A preparation method of high-transparency color-developing nylon-polyester fiber with a special skin-core structure is as follows:

[0069] (1) Prepare materials:

[0070] Skin layer base material: PA6, intrinsic viscosity is 2.47 dL / g;

[0071] Core layer base material: PET, intrinsic viscosity is 0.67 dL / g;

[0072] Coloring material: red masterbatch, manufacturer is Changzhou Longma High Polymer Technology Co., Ltd., model is NR008 red;

[0073] Nanoscale nucleating agent: composed of barium sulfate and polyester polyol (manufacturer is Shanghai Kayin Chemical Industry, brand is Dynacoll7360) with a mass ratio of 5:1;

[0074] Organic silicon light diffusing agent: polymethylsilsesquioxane, manufacturer is Yuheng Technology, product number is HY-7150;

[0075] Styrene maleic anhydride esterified product: Shenzhen Yingqun Chemical Industry, brand is XIRAN1440;

[0076] (2) Prepare the skin layer material and the core layer material respectively:

[0077] The skin layer material is composed of the skin layer base material, the nanoscale nucleating agent, the organic silicon light diffusing agent and the styrene maleic anhydride esterified product;

[0078] The core layer material is composed of the core layer base material, the coloring material and the styrene maleic anhydride esterified product;

[0079] (3) Spinning:

[0080] Adopt a skin-core composite structure spinning assembly, and use the two-component composite spinning technology to process the above-mentioned skin layer material and core layer material into high-transparency color-developing nylon-polyester fiber with a special skin-core structure;

[0081] During the processing: the temperatures of each zone of the screw extruder corresponding to the core layer material are 260 °C in zone 1, 270 °C in zone 2, 285 °C in zone 3, 290 °C in zone 4, 290 °C in zone 5, and the temperatures of each zone of the screw extruder corresponding to the skin layer material are 250 °C in zone 1, 265 °C in zone 2, 280 °C in zone 3, 285 °C in zone 4, 290 °C in zone 5, the side blowing temperature is 25 °C, the side blowing speed is 0.4 m / s, and the side blowing humidity is 72%.

[0082] Finally, the obtained high-transparency and color-developing nylon-polyester fiber with a special skin-core structure has a circular cross-sectional outer contour of the skin layer and a regular octagon cross-sectional contour of the core layer; the side length of the regular octagon is 0.38 times the radius of the circle, and the circumradius of the regular octagon is 1 / 2 times the radius of the circle; the mass ratio of the core layer in the fiber is 18.2%; the content of the coloring material in the core layer is 5wt%, and the content of styrene maleic anhydride ester is 6wt%; the content of the nano-nucleating agent in the skin layer is 6wt%, the content of the silicone light diffusing agent is 2wt%, and the content of styrene maleic anhydride ester is 5wt%; the light transmittance of the skin layer is 95.3%.

[0083] The high-transparency and color-developing nylon-polyester fiber with a special skin-core structure prepared in this example will not show an obvious skin layer structure under natural light and has no glare; if the core layer is circular and the radius is the same as the circumradius of the core layer in this example, then the color layer (core layer) cannot be highlighted under natural light, an obvious skin layer structure can be observed, and there is a glare.

[0084] After weaving the high-transparency and color-developing nylon-polyester fiber with a special skin-core structure into a fabric, the K / S value is tested. At the same time, a comparative sample is woven into a fabric with the same specifications and tissue structure and the K / S value is tested. The raw materials and dosages of the comparative sample and the high-transparency and color-developing nylon-polyester fiber with a special skin-core structure are the same, and the only difference is the shape of the core layer. The shape of the core layer of the comparative sample is circular. The test results show that the fabric prepared from the fiber described in Example 3 has a 93.2% increase in K / S compared with the comparative sample.

[0085] Example 4

[0086] A preparation method of a high-transparency and color-developing nylon-polyester fiber with a special skin-core structure is as follows:

[0087] (1) Prepare materials:

[0088] Skin layer substrate: PA6, with an intrinsic viscosity of 2.53 dL / g;

[0089] Core layer substrate: PET, with an intrinsic viscosity of 0.67 dL / g;

[0090] Coloring material: blue masterbatch, manufacturer is Changzhou Longma Polymer Technology Co., Ltd., model is NB290 blue;

[0091] Nano-nucleating agent: composed of barium sulfate and polyester polyol (manufacturer is Hunan Juren Chemical Industry, brand is PCL-2102) with a mass ratio of 6:1;

[0092] Silicone light diffusing agent: polymethylsilsesquioxane, manufacturer is Yuheng Technology, product number is HY-7200;

[0093] Styrene maleic anhydride ester: Shenzhen Yingqun Chemical Industry, brand is XIRAN1440;

[0094] (2) Configure the skin layer material and the core layer material respectively:

[0095] The skin layer material consists of a skin layer substrate, a nano nucleating agent, an organosilicon light diffusing agent, and a styrene maleic anhydride ester;

[0096] The core layer material consists of a core layer substrate, a coloring material, and a styrene maleic anhydride ester;

[0097] (3) Spinning:

[0098] Adopt a skin-core composite structure spinning assembly, and use the two-component composite spinning technology to process the above-mentioned skin layer material and core layer material into high-transparency color-developing nylon-polyester fibers with a special skin-core structure;

[0099] During the processing: the temperatures of each zone of the screw extruder corresponding to the core layer material are 260 °C in zone 1, 270 °C in zone 2, 285 °C in zone 3, 290 °C in zone 4, and 290 °C in zone 5. The temperatures of each zone of the screw extruder corresponding to the skin layer material are 250 °C in zone 1, 265 °C in zone 2, 280 °C in zone 3, 285 °C in zone 4, and 290 °C in zone 5. The side blow air temperature is 30 °C, the side blow air speed is 0.55 m / s, and the side blow air humidity is 65%.

[0100] The finally obtained high-transparency color-developing nylon-polyester fibers with a special skin-core structure have a circular cross-sectional outer contour for the skin layer and a regular hexagonal cross-sectional contour for the core layer; the side length of the regular hexagon is 0.25 times the radius of the circle, and the circumradius of the regular hexagon is 1 / 4 times the radius of the circle; the proportion of the core layer mass in the fiber is 10.6%; the content of the coloring material in the core layer is 4 wt%, and the content of the styrene maleic anhydride ester is 5 wt%; the content of the nano nucleating agent in the skin layer is 6 wt%, the content of the organosilicon light diffusing agent is 3 wt%, and the content of the styrene maleic anhydride ester is 10 wt%; the light transmittance of the skin layer is 95.8%.

[0101] For the high-transparency color-developing nylon-polyester fibers with a special skin-core structure prepared in this example, no obvious skin layer structure can be observed under natural light, and there is no glare; if the core layer is circular and has the same circumradius as the core layer in this example, then the color layer (core layer) cannot be highlighted under natural light, an obvious skin layer structure can be observed, and there is a glare.

[0102] After knitting the high-transparency color-developing nylon-polyester fibers with a special skin-core structure into a fabric, the K / S value is tested. At the same time, a contrast sample is knitted into a fabric with the same specifications and organizational structure and the K / S value is tested. The raw materials and dosages of the contrast sample and the high-transparency color-developing nylon-polyester fibers with a special skin-core structure are the same, and the only difference is the shape of the core layer. The shape of the core layer of the contrast sample is circular. The test results show that the fabric made of the fibers described in Example 4 has a 90.4% higher K / S than the contrast sample.

[0103] Example 5

[0104] A preparation method of highly transparent and color - showing nylon - polyester fiber with a special skin - core structure, the specific steps are as follows:

[0105] (1) Prepare materials:

[0106] Skin layer base material: PA6, intrinsic viscosity is 2.6 dL / g;

[0107] Core layer base material: PET, intrinsic viscosity is 0.68 dL / g;

[0108] Coloring material: yellow masterbatch, manufacturer is Changzhou Longma High - tech Co., Ltd., model is NY119 yellow;

[0109] Nano - nucleating agent: composed of barium sulfate and polyester polyol (manufacturer is Shanghai Kayin Chemical Industry, brand is Dynacoll7360) with a mass ratio of 8:1;

[0110] Organic silicon light diffusing agent: polymethylsilsesquioxane, manufacturer is Yuheng Technology, product number is HY - 7200;

[0111] Styrene - maleic anhydride esterified product: Shenzhen Yingqun Chemical Industry, brand is XIRAN1440;

[0112] (2) Prepare the skin layer material and the core layer material respectively:

[0113] The skin layer material is composed of the skin layer base material, nano - nucleating agent, organic silicon light diffusing agent and styrene - maleic anhydride esterified product;

[0114] The core layer material is composed of the core layer base material, coloring material and styrene - maleic anhydride esterified product;

[0115] (3) Spinning:

[0116] Adopt a skin - core composite structure spinning assembly, and use two - component composite spinning technology to process the above - mentioned skin layer material and core layer material into highly transparent and color - showing nylon - polyester fiber with a special skin - core structure;

[0117] During the processing: the temperature of each zone of the screw extruder corresponding to the core layer material is 260 °C in zone 1, 270 °C in zone 2, 285 °C in zone 3, 290 °C in zone 4, 290 °C in zone 5, the temperature of each zone of the screw extruder corresponding to the skin layer material is 250 °C in zone 1, 265 °C in zone 2, 280 °C in zone 3, 285 °C in zone 4, 290 °C in zone 5, the side - blowing air temperature is 20 °C, the side - blowing air speed is 0.45 m / s, and the side - blowing air humidity is 68%.

[0118] The finally obtained high-transparency and color-developing nylon-polyester fiber with a special skin-core structure has a circular cross-sectional outer contour for the skin layer and a hexagonal (non-regular hexagon) cross-sectional contour for the core layer; the side length of the hexagon is 0.3-0.9 times the radius of the circle, and the circumradius of the hexagon is 1 / 4-1 / 2 times the radius of the circle; the mass ratio of the core layer in the fiber is 13.7%; the content of the coloring material in the core layer is 3wt%, and the content of styrene maleic anhydride esterified product is 5wt%; the content of the nano-nucleating agent in the skin layer is 7wt%, the content of the silicone light diffusing agent is 3wt%, and the content of styrene maleic anhydride esterified product is 10wt%; the light transmittance of the skin layer is 95.5%.

[0119] For the high-transparency and color-developing nylon-polyester fiber with a special skin-core structure prepared in this example, no obvious skin layer structure can be observed under natural light, and there is no glare; if the core layer is circular and the radius is the same as the circumradius of the core layer in this example, then the color layer (core layer) cannot be highlighted under natural light, an obvious skin layer structure can be observed, and there is a glare.

[0120] After knitting the high-transparency and color-developing nylon-polyester fiber with a special skin-core structure into a fabric, the K / S value is measured. At the same time, a comparative sample is knitted into a fabric with the same specifications and tissue structure and then the K / S value is measured. The raw materials and dosages of the comparative sample and the high-transparency and color-developing nylon-polyester fiber with a special skin-core structure are the same, and the only difference lies in the shape of the core layer. The shape of the core layer of the comparative sample is circular. The test results show that the fabric prepared from the fiber described in Example 5 has a 72.5% increase in K / S compared with the comparative sample.

[0121] Example 6

[0122] A preparation method of a high-transparency and color-developing nylon-polyester fiber with a special skin-core structure is as follows:

[0123] (1) Prepare materials:

[0124] Skin layer substrate: PA6, with an intrinsic viscosity of 2.6 dL / g;

[0125] Core layer substrate: PET, with an intrinsic viscosity of 0.68 dL / g;

[0126] Coloring material: black masterbatch, manufactured by Changzhou Longma High Polymer Technology Co., Ltd., model NC607D black;

[0127] Nano-nucleating agent: composed of barium sulfate and long-chain calcium carboxylate (manufactured by Shanghai Kayin Chemical Industry, brand Licomont Cav102) with a mass ratio of 8:1;

[0128] Silicone light diffusing agent: polymethylsilsesquioxane, manufactured by Yuheng Technology, product number HY-7200;

[0129] Styrene maleic anhydride esterified product: Shenzhen Yingqun Chemical Industry, brand XIRAN1440;

[0130] (2) Prepare the skin layer material and the core layer material respectively:

[0131] The skin layer material consists of a skin layer substrate, a nano nucleating agent, an organosilicon light diffusing agent, and a styrene maleic anhydride esterified product;

[0132] The core layer material consists of a core layer substrate, a coloring material, and a styrene maleic anhydride esterified product;

[0133] (3) Spinning:

[0134] Use a skin-core composite structure spinning assembly and utilize the two-component composite spinning technology to process the above-mentioned skin layer material and core layer material into high-transparency and color-developing nylon-polyester fibers with a special skin-core structure;

[0135] During the processing: the temperatures of each zone of the screw extruder corresponding to the core layer material are 260 °C in zone 1, 270 °C in zone 2, 285 °C in zone 3, 290 °C in zone 4, and 290 °C in zone 5; the temperatures of each zone of the screw extruder corresponding to the skin layer material are 250 °C in zone 1, 265 °C in zone 2, 280 °C in zone 3, 285 °C in zone 4, and 290 °C in zone 5; the side blowing temperature is 30 °C, the side blowing speed is 0.35 m / s, and the side blowing humidity is 70%.

[0136] The finally obtained high-transparency and color-developing nylon-polyester fibers with a special skin-core structure have a circular cross-sectional outer contour of the skin layer and a triangular (non-equilateral triangle) cross-sectional contour of the core layer; the side length of the triangle is 0.3-0.9 times the radius of the circle, and the circumradius of the triangle is 1 / 4-1 / 2 times the radius of the circle; the mass ratio of the core layer in the fiber is 14.4%; the content of the coloring material in the core layer is 2 wt%, and the content of the styrene maleic anhydride esterified product is 8 wt%; the content of the nano nucleating agent in the skin layer is 8 wt%, the content of the organosilicon light diffusing agent is 4 wt%, and the content of the styrene maleic anhydride esterified product is 5 wt%; the light transmittance of the skin layer is 96%.

[0137] For the high-transparency and color-developing nylon-polyester fibers with a special skin-core structure prepared in this example, no obvious skin layer structure can be observed under natural light and there is no glare; if the core layer is circular and the radius is the same as the circumradius of the core layer in this example, then the color layer (core layer) cannot be highlighted under natural light, an obvious skin layer structure can be observed, and there is a glare.

[0138] After weaving the high-transparency and color-developing nylon-polyester fiber with a special skin-core structure into a fabric, the K / S value was measured. At the same time, a comparative sample was woven into a fabric with the same specifications and organizational structure, and the K / S value was measured. The raw materials and dosages of the comparative sample and the high-transparency and color-developing nylon-polyester fiber with a special skin-core structure were the same, and the only difference was the shape of the core layer. The shape of the core layer of the comparative sample was circular. The test results showed that the K / S of the fabric made from the fiber described in Example 6 increased by 78.8% compared with the comparative sample.

Claims

1. A highly transparent and color - showing nylon - polyester fiber with a special skin - core structure, containing a coloring material. The coloring material is located in the core layer, the base material of the skin layer is polyamide, and the base material of the core layer is polyester. Its characteristics are that, The outer contour of the cross-section of the skin layer is circular, and the cross-section contour of the core layer is polygonal; The side length of the polygon is 0.2 - 0.6 times the radius of the circle, and the circumradius of the polygon is 1 / 4 - 1 / 2 times the radius of the circle; The polygon is a triangle, a hexagon or an octagon; The light transmittance of the skin layer is above 95%; 2. The highly transparent and color-developing nylon-polyester fiber with a special skin-core structure according to claim 1, wherein The triangle is an equilateral triangle, and the hexagon is a regular hexagon.

3. The highly transparent and color-developing nylon-polyester fiber with a special skin-core structure according to claim 1, characterized in that, The coloring material is an inorganic pigment or an organic pigment, and the content of the coloring material in the core layer is 2 - 5 wt%; 4. The highly transparent and color-developing nylon-polyester fiber with a special skin-core structure according to claim 1, wherein, The skin layer contains 6 - 8 wt% of a nano nucleating agent, and the nano nucleating agent is composed of an organic nano nucleating agent and an inorganic nano nucleating agent with a mass ratio of 5 - 8:

1.

5. A highly transparent and color - showing nylon - polyester fiber with a special skin - core structure according to claim 4, characterized in that, The inorganic nano nucleating agent is barium sulfate, and the organic nano nucleating agent is a polyester polyol or a calcium salt nucleating agent.

6. The high-transparency and color-developing nylon-polyester fiber with a special skin-core structure according to claim 1, characterized in that, The skin layer contains 2 - 5 wt% of an organosilicon light diffusing agent.

7. The highly transparent and color - showing nylon - polyester fiber with a special skin - core structure according to claim 1, characterized in that, The core layer contains 5 - 8 wt% of a styrene maleic anhydride esterified product, and the skin layer contains 5 - 10 wt% of a styrene maleic anhydride esterified product, and all the styrene maleic anhydride esterified products are crosslinked with each other.

8. The high-transparency and color-developing nylon-polyester fiber with a special skin-core structure according to claim 1, characterized in that, The mass proportion of the core layer in the fiber is 10 - 20%, the polyamide is PA6, the intrinsic viscosity of the polyamide is 2.4 - 2.6 dL / g, and the intrinsic viscosity of the polyester is 0.67 - 0.68 dL / g.

9. A method for preparing a highly transparent and color-developing nylon-polyester fiber with a special skin-core structure as described in any one of claims 1-8, characterized in that, Using a skin-core composite structure spinning assembly, the skin layer material and the core layer material are processed into high-transparency and color-developing nylon-polyester fibers with a special skin-core structure by using a two-component composite spinning technology.

10. The method according to claim 9, characterized in that, During the processing, the temperature of each zone of the screw extruder corresponding to the core layer material is 260 - 290 °C, the temperature of each zone of the screw extruder corresponding to the skin layer material is 250 - 290 °C, the side blowing temperature is 20 - 30 °C, the side blowing speed is 0.35 - 0.55 m / s, and the side blowing humidity is 70 ± 5%.

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