Hollow thermal fiber and method for manufacturing the same

Abstract

The present application discloses a hollow thermal fiber and a manufacturing method thereof. The hollow thermal fiber comprises a fiber body, a plurality of hollow channels are arranged in the circumferential direction of the fiber body in a cross section perpendicular to the extending direction of the fiber body, the extending direction of the hollow channels is consistent with the extending direction of the fiber body, and the shape of the hollow channels in the cross section is triangular. The hollow thermal fiber can reduce the degree of deformation when being extruded, thereby improving the problem of the decrease of the thermal effect of the fiber.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation fiber technology, specifically to a hollow thermal insulation fiber and its manufacturing method. Background Technology

[0002] Hollow insulation fibers have hollow channels extending along the fiber's length, which can store a large amount of static air, achieving excellent thermal insulation. However, when existing hollow insulation fibers are compressed, the internal hollow channels deform, causing a decrease in fiber hollowness, a reduction in the amount of air stored inside the fiber, and a decrease in the fiber's insulation effect. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects or problems in the prior art and to provide a hollow thermal insulation fiber and its manufacturing method. The hollow thermal insulation fiber can reduce the degree of deformation when compressed, thereby improving the problem of decreased fiber thermal insulation effect.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] First technical solution: A hollow thermal insulation fiber, comprising a fiber body; on a cross-section perpendicular to the extension direction of the fiber body, the fiber body is provided with a plurality of hollow channels arranged circumferentially, the extension direction of the hollow channels being consistent with the extension direction of the fiber body; the hollow channels are triangular in shape on the cross-section.

[0006] The second technical solution is based on the first technical solution: on the cross-section, each of the hollow channels is arranged circumferentially in a rotationally symmetrical manner.

[0007] The third technical solution is based on the second technical solution: on the cross-section, the hollow channel is shaped like an isosceles triangle, and the length of the isosceles triangle is greater than the length of the base.

[0008] The fourth technical solution is based on the third technical solution: on the cross-section, the apex angle of the isosceles triangle formed by each hollow channel points to the rotational symmetry center of the hollow channel.

[0009] The fifth technical solution is based on the fourth technical solution: in the fiber body, the number of hollow channels is 3-7.

[0010] The sixth technical solution is based on the first to fifth technical solutions: the inner wall of each hollow channel is attached with an infrared reflective layer.

[0011] Furthermore, the present invention also provides a seventh technical solution: a method for preparing hollow thermal insulation fiber, which is used to prepare hollow thermal insulation fiber as described in the sixth technical solution, comprising the following steps: spinning resin raw material through a spinneret to obtain a fiber body; on a cross-section perpendicular to the extension direction of the fiber body, the fiber body is provided with a plurality of hollow channels arranged circumferentially, the extension direction of the hollow channels being consistent with the extension direction of the fiber body; the hollow channels are triangular in shape on the cross-section; cutting and surface-active finishing the fiber body to obtain a pretreated fiber body; placing the pretreated fiber body vertically, immersing the bottom of the fiber body in an infrared reflective gel material, using capillary effect to draw the infrared reflective gel material into the hollow channels, and heating to attach the infrared reflective gel material to the inner wall of the hollow channels, thereby obtaining a fiber with an infrared reflective layer.

[0012] The eighth technical solution is based on the seventh technical solution: after obtaining the fiber with the infrared reflective layer, it is washed multiple times in deionized water and then dried.

[0013] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention provides a hollow thermal insulation fiber with multiple hollow channels arranged circumferentially. The cross-sectional shape of each hollow channel is triangular, which provides high structural stability. When compressed, the sides of the triangular hollow channels support each other, preventing deformation. Arranging multiple hollow channels circumferentially ensures a certain degree of hollowness in the fiber while maintaining a relatively small cross-sectional size. Therefore, the fiber has good thermal insulation properties and its thermal insulation effect does not decrease excessively when compressed.

[0015] The hollow channels are arranged in a rotationally symmetrical manner, which can effectively utilize the space of the fiber cross-section, maximize the number of hollow channels, and improve the hollowness of the fiber.

[0016] Furthermore, the cross-sectional shape of the hollow channel is set as an isosceles triangle, with the leg length of the triangle being greater than the base length. The shorter base length allows the hollow channel to be more slender in cross-section. Additionally, the apex of the isosceles triangle points to the rotational symmetry center of the hollow channel. When compressed, the base of the hollow channel is subjected to force first. Since the base length is shorter, most of the force is borne by the fiber body. Under the condition of maintaining the same cross-sectional area, the hollow channel is subjected to smaller impact areas and has a lower degree of deformation.

[0017] Infrared reflective gel is drawn into the fiber body through capillary action. An infrared reflective layer can be placed on the inner wall of the hollow channel, which further enhances the heat retention effect. This method also allows for convenient adhesion of the infrared reflective gel to the inner wall of the hollow channel. Furthermore, placing the infrared reflective layer on the inner wall of the hollow channel avoids the risk of it detaching due to scratches when placed on the outer surface of the fiber body, thus extending the duration of the fiber's heat retention effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the cross-sectional structure of an embodiment of the hollow thermal insulation fiber provided by the present invention;

[0020] Figure 2 A schematic diagram of the vertical cross-section structure of an embodiment of the hollow thermal insulation fiber provided by the present invention;

[0021] Figure 3 A schematic cross-sectional view of an embodiment of the hollow thermal insulation fiber provided by the present invention before and after being compressed.

[0022] Explanation of key figure labels:

[0023] Hollow channel 1; fiber body 2; channel assembly 3; uncompressed channel 4; compressed channel 5. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0026] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0027] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0028] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0029] Embodiment 1 of the present invention provides a hollow thermal insulation fiber, which includes a fiber body 2, a plurality of hollow channels 1 are provided in the fiber body 2, and an infrared reflective layer is attached to the inner wall of the hollow channel 1, thereby obtaining the hollow thermal insulation fiber.

[0030] Specifically, refer to Figure 1 It shows that on a cross-section perpendicular to the extension direction of the fiber body 2, the fiber body 2 is provided with a plurality of hollow channels 1 arranged circumferentially, the extension direction of each hollow channel 1 is consistent with the extension direction of the fiber body 2, and the shape of each hollow channel 1 on the cross-section is triangular.

[0031] Specifically, refer to Figure 2 It shows the structure of the fiber body 2, and from Figure 2 It can be seen that the fiber body 2 is a cylindrical filament with a certain length and a circular cross-section, thus defining the circumferential direction. At the same time, the length direction of the fiber body 2 defines the axial direction, and the center position of the fiber body 2 on the cross-section forms the axial part of the fiber body 2.

[0032] Multiple hollow channels 1 are arranged circumferentially on the fiber body 2. These hollow channels 1 cooperate to form channel assembly 3. The hollow channels 1 in channel assembly 3 all extend along the length of the fiber body 2, and the length of these hollow channels 1 is consistent with the length of the fiber body 2. Therefore, openings can be formed at both ends of the fiber body 2, allowing air to enter the hollow channels 1 through these openings. Since the cross-section of the fiber body 2 is circular, the circumferential arrangement of multiple hollow channels 1 can be understood as these hollow channels 1 being arranged sequentially along the circumferential edge of the fiber body 2. Furthermore, the cross-sectional shape of these hollow channels 1 is triangular. The triangular hollow channels 1 have high structural stability. When they are compressed, the sides of the triangular hollow channels 1 support each other, making the hollow channels 1 less prone to deformation. Moreover, arranging multiple hollow channels 1 circumferentially ensures that the fiber has a certain degree of hollowness even with a relatively small cross-sectional size of the hollow channels 1. Thus, the fiber has a good heat retention effect, and the heat retention effect will not decrease excessively when compressed.

[0033] Preferably, on the cross-section of the fiber body 2, each hollow channel 1 is arranged circumferentially in a rotationally symmetrical manner. Specifically, refer to... Figure 1 The rotational symmetry center of these hollow channels 1 is the center of the circle corresponding to the circumference formed by the fiber body 2. In this embodiment, there are 6 hollow channels 1, which are evenly arranged in the circumferential direction. Therefore, the central angle between the centers of the triangles corresponding to adjacent hollow channels 1 is 60 degrees. By arranging them in a rotationally symmetrical manner, the space in the cross-section of the fiber body 2 can be utilized more effectively, maximizing the number of hollow channels 1 and increasing the hollowness of the fiber.

[0034] Of course, in other embodiments, the number of hollow channels 1 can also be set to other numbers, such as 4, 5, 7, etc. However, the number of hollow channels 1 in a fiber body 2 should be between 3 and 7 to ensure that there is a sufficient number of hollow channels 1, while the strength of the fiber itself will not be affected by too many hollow channels 1.

[0035] Reference Figure 1 In this embodiment, the hollow channel 1 in the cross-section of the fiber body 2 is an isosceles triangle, with the length of the legs of the isosceles triangle being greater than the length of the base, and the vertices of these isosceles triangles all pointing to the center of rotational symmetry of the hollow channel 1. Specifically, referring to... Figure 1The hollow channel 1 forms an isosceles triangle on the cross-section of the fiber body 2, with its base facing outwards and its apex pointing towards the center of rotational symmetry of the hollow channel 1. By setting the cross-sectional shape of the hollow channel 1 as an isosceles triangle, with the legs longer than the base, the shorter base allows the hollow channel 1 to appear more slender in cross-section. Furthermore, by having the apex of the isosceles triangle point towards the center of rotational symmetry of the hollow channel 1, when compressed, the base of the hollow channel 1 is subjected to force first. Due to the shorter base, most of the force is borne by the fiber body 2. Therefore, while maintaining the same cross-sectional area, the hollow channel 1 experiences less impact and less deformation.

[0036] Furthermore, in this embodiment, an infrared reflective layer is attached to the inner wall of the hollow channel 1. This infrared reflective layer is formed by the attachment of an infrared reflective gel. In this embodiment, the infrared reflective gel is obtained by hydrolysis and polycondensation of fibrous silver nanoparticles, a metal coupling agent containing amide groups and silicon elements, and an alkoxide compound.

[0037] This embodiment also provides a method for preparing the above-mentioned hollow thermal insulation fiber, which includes the following steps: spun resin raw material through a spinneret to obtain a fiber body 2; on a cross-section perpendicular to the extension direction of the fiber body 2, the fiber body 2 is provided with a plurality of hollow channels 1 arranged circumferentially, the extension direction of the hollow channels 1 being consistent with the extension direction of the fiber body 2; the hollow channels 1 are triangular in shape on the cross-section; the fiber body 2 is cut and surface-actively treated to obtain a pretreated fiber body 2; the pretreated fiber body 2 is placed vertically, with the bottom of the fiber body 2 immersed in an infrared reflective gel material, and the infrared reflective gel material is drawn into the hollow channels 1 by capillary effect, and the infrared reflective gel material is attached to the inner wall of the hollow channels 1 by heating, thereby obtaining a fiber with an infrared reflective layer. Further, after obtaining the fiber with the infrared reflective layer, it is washed multiple times in deionized water and then dried to obtain the final hollow thermal insulation fiber.

[0038] Specifically, the spinneret is provided with a predetermined number of triangular holes pointing towards the fiber axis. Fibers are spun through these holes to obtain a fiber body 2 with multiple hollow channels 1 in its cross-section. The resin material used for spinning can be selected according to actual conditions, such as polyester or nylon; in this embodiment, polyester is selected.

[0039] The fiber body 2 is then cut to obtain short fibers with a length of 35mm-80mm. This length is the optimal length for the spinning process. The twisting effect of the short fibers compresses the fiber body 2, which can improve the strength and warmth retention of the fiber body 2.

[0040] The cut fiber body 2 is then pretreated, namely surface active treatment, to improve the interfacial affinity between the outer surface of the fiber body 2 and the inner wall of the hollow channel 1, which facilitates the subsequent adhesion of the infrared reflective gel.

[0041] The pretreated fiber body 2 is then placed vertically, with its bottom immersed in the infrared reflective gel material. The infrared reflective gel is drawn into the inner wall of the hollow channel 1 using capillary action. The fiber body 2 is then placed in a high-temperature environment, allowing the infrared reflective gel material to adhere to the inner wall of the hollow channel 1. The specific temperature of this high-temperature environment can be between 125 and 150 degrees Celsius. Alternatively, the entire fiber body 2 can be placed within the infrared reflective gel material, and heating can be used to adhere the infrared reflective gel material to the outer surface of the fiber body 2, thereby improving the overall warmth retention of the fiber.

[0042] Afterwards, the fiber body 2 with the infrared reflective layer attached can be cleaned with deionized water and dried. After repeating this process several times, the infrared reflective layer can be further solidified on the fiber body 2, thereby obtaining hollow thermal insulation fiber.

[0043] Infrared reflective gel is drawn into the fiber body 2 through capillary effect. An infrared reflective layer can be set on the inner wall of the hollow channel 1, which can further enhance the heat retention effect. This method also makes it easy to attach the infrared reflective gel to the inner wall of the hollow channel 1. Furthermore, setting the infrared reflective layer on the inner wall of the hollow channel 1 can prevent the infrared reflective layer from falling off due to scratches when it is set on the outer surface of the fiber body 2, thereby extending the duration of the fiber's heat retention effect.

[0044] Reference Figure 3 This is a magnified micrograph of the actual product of this hollow thermal insulation fiber. Figure 3 The left-hand diagram shows the hollow insulating fiber when it is not compressed. Hollow channel 1, when uncompressed, is channel 4, and its shape is basically... Figure 1 The shape shown; Figure 3 The diagram on the right shows the hollow insulating fiber under compression, where the hollow channel 1 under compression is the compression channel 5, and its shape is different from that of the other channel. Figure 1 The shape shown undergoes slight deformation, but still maintains a relatively intact hollow channel 1, with a low degree of decrease in fiber hollowness. The aforementioned compression of the hollow insulating fiber refers to applying a certain pressure, ranging from 5N to 10N, to both symmetrical sides of the hollow insulating fiber.

[0045] Depend on Figure 3It can be seen that the hollow thermal insulation fiber provided in this embodiment can still maintain a good shape under a certain range of pressure, thus avoiding an excessive decrease in the hollowness of the fiber. It should be noted that the hollowness referred to here refers to the space occupied by the hollow channels 1 within the cylindrical structure enclosed by the outer wall of the fiber body 2. When compressed, the hollow channels 1 within the fiber are compressed, resulting in a reduction in the occupied space and consequently a decrease in hollowness. Only by improving the structural stability of the hollow channels 1 can the fiber maintain a high degree of hollowness even under compression.

[0046] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. A process for the production of hollow thermal fibers, characterized by, The method comprises the following steps: The resin raw material is spun through a spinneret to obtain a fiber body (2); in a cross section perpendicular to the extending direction of the fiber body (2), the fiber body (2) is circumferentially provided with a plurality of hollow channels (1), the extending direction of the hollow channels (1) is consistent with the extending direction of the fiber body (2); the shape of the hollow channels (1) in the cross section is triangular; The fiber body (2) is cut and surface-activated to obtain a pretreated fiber body (2); The pretreated fiber body (2) is vertically placed, the bottom of the fiber body (2) is immersed in infrared reflective gel material, the infrared reflective gel material is absorbed into the hollow channels (1) by capillary effect, and the infrared reflective gel material is attached to the inner wall of the hollow channels (1) by heating to obtain a fiber with an infrared reflective layer.

2. The method for preparing hollow thermal insulation fiber as described in claim 1, characterized in that, After obtaining the fiber with the infrared reflective layer, the fiber is cleaned multiple times in deionized water and then dried.

3. The method for preparing hollow thermal insulation fiber as described in claim 1, characterized in that, In the cross section, each of the hollow channels (1) is arranged in a rotationally symmetric manner along the circumference.

4. The method for preparing hollow thermal insulation fiber as described in claim 3, characterized in that, In the cross section, the shape of the hollow channels (1) is isosceles triangle, and the length of the legs of the isosceles triangle is greater than the length of the base.

5. The method for preparing hollow thermal insulation fiber as described in claim 4, characterized in that, In the cross section, the apex angle of the isosceles triangle formed by each of the hollow channels (1) points to the rotationally symmetric center of the hollow channel (1).

6. The method for preparing hollow thermal insulation fiber as described in claim 5, characterized in that, In the fiber body (2), the number of the hollow channels (1) is 3-7.

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