Hollow super-thermal fiber and preparation method thereof

Abstract

The invention discloses a hollow super-thermal fiber and a preparation method thereof, and relates to the technical field of spinning, and the preparation method comprises the following steps: step S10: adding an initial aluminum sheet into a water phase system, and performing ultrasonic dispersion to obtain a first mixed solution; s20, a coupling agent is added into the first mixed solution and stirred, a second mixed solution is obtained, and the initial aluminum sheet is subjected to surface modification to obtain a target aluminum sheet; s30, the target aluminum sheet in the second mixed solution is filtered out and dried; s40, the target aluminum sheet and polyester are added into a screw extruder at the same time, the mass ratio of the target aluminum sheet to the polyester is (0.2-0.3): 1, and a target polyester chip is prepared; s50, in the spinning process, the target polyester chips and the conventional polyester chips are added into a screw at the same time, and the hollow super-warm-keeping fiber is prepared. According to the hollow super-warm-keeping fiber and the preparation method thereof, the warm-keeping effect of a hollow fiber material can be improved.

Description

Technical Field

[0001] This specification relates to the field of spinning technology, and in particular to a hollow super-warm fiber and its preparation method. Background Technology

[0002] Hollow fiber insulation is a special type of fiber with a continuous hollow internal structure, primarily used to block heat transfer. Its principle is based on the low thermal conductivity of air: the hollow parts of the fiber trap still air, reducing heat conduction; the porous structure inhibits airflow, weakening convective heat transfer. This combined effect forms a highly efficient thermal barrier, achieving excellent thermal insulation performance, and is widely used in thermal clothing, building insulation, and other fields.

[0003] However, relying solely on the still air in the hollow parts of the fiber for insulation is not effective enough, because the fiber matrix, such as polyester and nylon, has a high thermal conductivity and easily conducts heat, making it impossible to prevent the internal radiant heat from diffusing outward. Summary of the Invention

[0004] In view of the shortcomings of the prior art, one object of this specification is to provide a hollow super-warm fiber and its preparation method, which can improve the warmth retention effect of hollow fiber materials.

[0005] To achieve the above objectives, this specification provides a method for preparing hollow super-warm fiber, comprising the following steps: Step S10: Add the initial aluminum sheet to the aqueous system and disperse it using ultrasound to obtain the first mixture; Step S20: Add a coupling agent to the first mixture and stir to obtain a second mixture, and perform surface modification on the initial aluminum sheet to obtain the target aluminum sheet; Step S30: Filter out the target aluminum sheet from the second mixture and dry it; Step S40: The target aluminum sheet and polyester are simultaneously added to a screw extruder, with the mass ratio of the target aluminum sheet to the polyester being (0.2~0.3):1, to prepare target polyester chips; Step S50: During the spinning process, the target polyester chips and conventional polyester chips are simultaneously added to the screw to prepare hollow ultra-warm fiber.

[0006] In a preferred embodiment, in step S10, the particle size of the initial aluminum sheet is 200nm~300nm.

[0007] In a preferred embodiment, in step S10, the initial aluminum sheet has a mass percentage of 20% to 30% relative to water.

[0008] In a preferred embodiment, in step S10, the power of the ultrasound is 450W~650W, and the duration of the ultrasound is 10min~30min.

[0009] In a preferred embodiment, in step S20, the coupling agent is one of KH550, KH560, and KH570.

[0010] In a preferred embodiment, in step S20, the coupling agent has a mass percentage of 1% to 3% relative to water.

[0011] In a preferred embodiment, in step S20, the stirring time is 20 min to 40 min, and the stirring speed is 450 r / min to 550 r / min.

[0012] In a preferred embodiment, in step S40, the screw temperature of the screw extruder is 260°C to 280°C.

[0013] In a preferred embodiment, in step S50, the ratio of the target polyester chip to the conventional polyester chip is (0.8~1):1; and the spinning temperature is 250℃~270℃.

[0014] This application also provides a hollow super-warm fiber, which is prepared by the preparation method described in any of the above embodiments. Beneficial effects

[0015] The method for preparing hollow super-insulating fiber provided in this embodiment uses ultrasound to disperse the initial aluminum sheet and a coupling agent to modify it, ultimately obtaining the target aluminum sheet. This solves the problem of the initial aluminum sheet easily agglomerating and having poor dispersibility in the fiber, leading to a decrease in fiber strength. It ensures that the target aluminum sheet is well dispersed in the fiber, guaranteeing that the fiber strength does not decrease. Simultaneously, the addition of aluminum sheets reduces the radiant heat transmittance of the polyester matrix, reflecting most of the radiant heat transmitted from the human body, thereby improving the insulation effect of the hollow fiber material.

[0016] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope as a result.

[0017] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0018] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart illustrating the steps of a method for preparing a hollow super-warm fiber provided in this embodiment. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0022] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or may be interposed with another element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or may be interposed with another element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] To address the issue of insufficient thermal insulation performance in hollow fiber materials, this application proposes to incorporate ultra-thin aluminum sheets as an additive. Aluminum sheets have high infrared reflectivity and are commonly used in infrared stealth applications, reflecting most of the body's radiant heat back to prevent heat loss and thus improve the thermal insulation performance of the fiber material. However, aluminum sheets tend to agglomerate and have poor dispersion within the fiber, leading to a decrease in fiber strength.

[0025] Please see Figure 1 This application provides a method for preparing hollow super-warm fiber, comprising the following steps (steps S10, S20, S30, S40, and S50): Step S10: Add the initial aluminum sheet to the aqueous system and disperse it using ultrasound to obtain the first mixture.

[0026] In step S10, the initial aluminum sheet has a particle size of 200 nm to 300 nm. Specifically, the initial aluminum sheet accounts for 20% to 30% of the mass of water. The aqueous system containing the initial aluminum sheet contains only the initial aluminum sheet and water, and the water helps to disperse the initial aluminum sheet and facilitate ultrasonication.

[0027] Preferably, the ultrasonic power is 450W~650W and the ultrasonic duration is 10min~30min, so as to better disperse the initial aluminum sheet.

[0028] Step S20: Add coupling agent to the first mixture and stir to obtain the second mixture. Then, perform surface modification on the initial aluminum sheet to obtain the target aluminum sheet.

[0029] In step S20, the coupling agent is one of KH550, KH560, and KH570. Specifically, the mass percentage of the coupling agent relative to water is 1% to 3%.

[0030] Preferably, the stirring time is 20 min to 40 min and the stirring speed is 450 r / min to 550 r / min, so as to achieve full contact between the coupling agent and the aluminum sheet, and to achieve surface modification and efficient dispersion of the initial aluminum sheet by the coupling agent.

[0031] Step S30: Filter out the target aluminum sheet from the second mixture and dry it.

[0032] Specifically, the target aluminum sheet can be dried using a dryer.

[0033] Step S40: Add the target aluminum sheet and polyester to the screw extruder at the same time, with the mass ratio of the target aluminum sheet to the polyester being (0.2~0.3):1, to prepare target polyester chips.

[0034] In step S40, the screw temperature of the screw extruder is 260°C to 280°C. The target polyester chips are highly dispersed based on the target aluminum flakes.

[0035] Step S50: During the spinning process, target polyester chips and conventional polyester chips are simultaneously added to the screw to prepare hollow ultra-warm fiber.

[0036] In step S50, the ratio of target polyester chips to conventional polyester chips is (0.8~1):1. The spinning temperature is 250℃~270℃. Conventional polyester chips refer to chips containing only polyester, specifically chips made of PET with an intrinsic viscosity of 0.678±0.01. Other equipment and process parameters used in spinning can refer to the equipment and process parameters used in the conventional production of hollow fibers, and this application does not impose a unique limitation on them.

[0037] The method for preparing hollow super-insulating fiber provided in this embodiment uses ultrasound to disperse the initial aluminum sheet and a coupling agent to modify it, ultimately obtaining the target aluminum sheet. This solves the problem of the initial aluminum sheet easily agglomerating and having poor dispersibility in the fiber, leading to a decrease in fiber strength. It ensures that the target aluminum sheet is well dispersed in the fiber, guaranteeing that the fiber strength does not decrease. Simultaneously, the addition of aluminum sheets reduces the radiant heat transmittance of the polyester matrix, reflecting most of the radiant heat transmitted from the human body, thereby improving the insulation effect of the hollow fiber material.

[0038] In Example 1, initial aluminum flakes with a particle size of 200 nm were added to water, with the initial aluminum flakes accounting for 30% of the water by mass. The mixture was dispersed using 650W ultrasonication for 30 minutes to obtain a first mixture. KH550 was added to the first mixture and stirred, with KH550 accounting for 1% of the water by mass. The stirring time was 30 minutes, and the stirring speed was 500 r / min, resulting in a second mixture. The initial aluminum flakes were then surface-modified to obtain target aluminum flakes. The target aluminum flakes were filtered out and dried. The target aluminum flakes and polyester were simultaneously added to a screw extruder, with a target aluminum flake to polyester mass ratio of 0.2:1 and a screw temperature of 270°C, to prepare target polyester chips with high dispersion based on the target aluminum flakes. During spinning, target polyester chips and conventional polyester chips were simultaneously added to the screw, with a target polyester chip to conventional polyester chip ratio of 1:1 and a spinning temperature of 260°C. The conventional polyester chips were selected from PET chips with an intrinsic viscosity of 0.678±0.01, to prepare hollow ultra-warm fiber.

[0039] In Example 2, initial aluminum flakes with a particle size of 250 nm were added to water, with the initial aluminum flakes accounting for 25% of the mass percentage of water. The mixture was dispersed using 550W ultrasonication for 30 minutes to obtain a first mixture. KH550 was added to the first mixture and stirred, with KH550 accounting for 2% of the mass percentage of water. The stirring time was 30 minutes, and the stirring speed was 500 r / min, resulting in a second mixture. The initial aluminum flakes were then surface-modified to obtain target aluminum flakes. The target aluminum flakes were filtered out and dried. The target aluminum flakes and polyester were simultaneously added to a screw extruder, with a target aluminum flake to polyester mass ratio of 0.25:1 and a screw temperature of 270°C, to prepare highly dispersed target polyester chips based on the target aluminum flakes. During spinning, target polyester chips and conventional polyester chips were simultaneously added to the screw, with a target polyester chip to conventional polyester chip ratio of 0.9:1 and a spinning temperature of 260°C. The conventional polyester chips were selected from PET chips with an intrinsic viscosity of 0.678 ± 0.01, to prepare hollow ultra-warm fiber.

[0040] In Example 3, initial aluminum flakes with a particle size of 300 nm were added to water, with the initial aluminum flakes accounting for 20% of the water by mass. The mixture was dispersed using 450W ultrasonication for 30 minutes to obtain a first mixture. KH550 was added to the first mixture and stirred, with KH550 accounting for 3% of the water by mass. The stirring time was 30 minutes, and the stirring speed was 500 r / min, resulting in a second mixture. The initial aluminum flakes were then surface-modified to obtain target aluminum flakes. The target aluminum flakes were filtered out and dried. The target aluminum flakes and polyester were simultaneously added to a screw extruder, with a target aluminum flake to polyester mass ratio of 0.3:1 and a screw temperature of 270°C, to prepare highly dispersed target polyester chips based on the target aluminum flakes. During spinning, target polyester chips and conventional polyester chips were simultaneously added to the screw, with a target polyester chip to conventional polyester chip ratio of 0.8:1 and a spinning temperature of 260°C. The conventional polyester chips were selected from PET chips with an intrinsic viscosity of 0.678 ± 0.01, to prepare hollow ultra-warm fiber.

[0041] Through experiments and observations, it was found that the hollow super-warm fiber prepared in Examples 1, 2, and 3 above has a breaking strength ≥3.5 cN / dtex, and the clo value after being made into wadding is approximately 3.4 (200 g / m²). 2 ), while the clo value of conventional hollow fiber wadding is about 2.8 (200g / m³). 2 Therefore, the hollow super-warm fiber produced in this application has a certain strength and a better warming effect than hollow fiber without aluminum sheets.

[0042] Based on the same concept, this invention also provides a hollow super-warm fiber, which is prepared by the hollow super-warm fiber preparation method described in any of the above embodiments. For detailed descriptions of the relevant content, please refer to the above embodiments, which will not be repeated here.

[0043] In this embodiment, the implementation of the hollow super-warm fiber corresponds to the implementation of the preparation method, and it can solve the technical problems solved by the implementation of the preparation method and achieve the technical effects of the implementation of the preparation method. The specific details will not be repeated here.

[0044] It should be noted that in the description of this specification, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this specification, unless otherwise stated, "a plurality of" means two or more.

[0045] Any numerical values ​​cited herein include all values ​​ranging from a lower limit to an upper limit, increasing by one unit, with at least two units between any lower and any higher value. For example, if the quantity of a component or the value of a process variable (e.g., temperature, pressure, time, etc.) is described as being from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1, etc. These are merely examples intended for explicit expression, and it can be assumed that all possible combinations of values ​​listed between the minimum and maximum values ​​are explicitly described in this specification in a similar manner.

[0046] Unless otherwise stated, all ranges include the endpoints and all numbers between them. The terms "approximately" or "about" used with ranges apply to both endpoints of the range. Thus, "approximately 20 to 30" is intended to cover "approximately 20 to approximately 30," including at least the specified endpoints.

[0047] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional.

[0048] Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of "a" or "an" to describe an element, component, part, or step does not imply the exclusion of other elements, components, parts, or steps.

[0049] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A method for preparing hollow super-warm fiber, characterized in that, Includes the following steps: step S10: The initial aluminum sheet is added to the aqueous system and dispersed using ultrasound to obtain the first mixture; Step S20: Add a coupling agent to the first mixture and stir to obtain a second mixture, and perform surface modification on the initial aluminum sheet to obtain the target aluminum sheet; Step S30: Filter out the target aluminum sheet from the second mixture and dry it; Step S40: The target aluminum sheet and polyester are simultaneously added to a screw extruder, with the mass ratio of the target aluminum sheet to the polyester being (0.2~0.3):1, to prepare target polyester chips; Step S50: During the spinning process, the target polyester chips and conventional polyester chips are simultaneously added to the screw to prepare hollow ultra-warm fiber.

2. The method for preparing hollow super-warm fiber according to claim 1, characterized in that, In step S10, the initial aluminum sheet has a particle size of 200nm~300nm.

3. The method for preparing hollow super-warm fiber according to claim 1, characterized in that, In step S10, the initial aluminum sheet has a mass percentage of 20% to 30% relative to water.

4. The method for preparing hollow super-warm fiber according to claim 1, characterized in that, In step S10, the power of the ultrasound is 450W~650W, and the duration of the ultrasound is 10min~30min.

5. The method for preparing hollow super-warm fiber according to claim 1, characterized in that, In step S20, the coupling agent is one of KH550, KH560, and KH570.

6. The method for preparing hollow super-warm fiber according to claim 1, characterized in that, In step S20, the coupling agent has a mass percentage of 1% to 3% relative to water.

7. The method for preparing hollow super-warm fiber according to claim 1, characterized in that, In step S20, the stirring time is 20 min to 40 min, and the stirring speed is 450 r / min to 550 r / min.

8. The method for preparing hollow super-warm fiber according to claim 1, characterized in that, In step S40, the screw temperature of the screw extruder is 260℃~280℃.

9. The method for preparing hollow super-warm fiber according to claim 1, characterized in that, In step S50, the ratio of the target polyester chips to conventional polyester chips is (0.8~1):1; the spinning temperature is 250℃~270℃.

10. A hollow, ultra-warm fiber, characterized in that, The hollow super-warm fiber is prepared by any one of claims 1 to 9.

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