Yarn with heat insulation and energy storage functions and preparation method thereof

Abstract

The invention discloses a yarn with functions of heat insulation and energy storage and a preparation method of the yarn, temperature-regulating nano microcapsules of higher alkanes and coatings such as water-soluble resin, polyurethane and acrylic acid are mixed according to a certain proportion to prepare a coating aid, the yarn is treated in a coating mode, and the yarn with functions of phase change, heat insulation and energy storage is prepared.

Description

Technical Field

[0001] The invention relates to the field of textile yarns, and in particular to a yarn with heat insulation and energy storage functions and a preparation method thereof. Background Art

[0002] Phase change energy storage materials refer to a type of material that uses the phase or structural changes of the material itself within a certain temperature range to automatically absorb or release latent heat to the environment, thereby achieving the goal of regulating the ambient temperature.

[0003] Phase Change Materials (PCMs) are materials that can store and release energy through physical phase changes. They can undergo phase changes at specific temperatures, such as solid-liquid, liquid-gas or solid-solid phase changes, and absorb or release a large amount of heat energy in the process. The working principle of phase change energy storage materials is: when the ambient temperature is higher than the phase change temperature, the material changes from solid to liquid and absorbs heat; when the ambient temperature is lower than the phase change point, the material changes from liquid to solid and releases heat, thereby maintaining the ambient temperature at a suitable level.

[0004] The heat-resistant temperature of phase change energy storage materials is limited (no more than 220°C), so they cannot be used for spinning on some conventional chemical materials, and can only be used for spinning on some hydrocarbon substrates. However, the finished yarns of these materials have low physical properties and cannot be widely used in footwear and clothing fabrics. The melting point of polyolefin materials is generally less than 130°C, and their breaking strength is only about 2cN / dtex. If used in footwear fabrics, their bursting and tearing strengths will be unqualified. In order to meet the above requirements, the breaking strength of the yarn must be ≥3.5cN / dtex. Summary of the invention

[0005] Therefore, it is necessary to provide a yarn with heat insulation and energy storage and a preparation method thereof to solve the problem that the existing phase change energy storage material has unqualified bursting and tearing strength on the upper.

[0006] To achieve the above object, the present invention provides a method for preparing a yarn having heat insulation and energy storage properties, comprising the following steps:

[0007] (1) Plasma cleaning is performed on the surface of the first fiber; the surface is cleaned and activated by plasma cleaning.

[0008] (2) preparing padding solution;

[0009] (3) soaking, squeezing and drying the fibers;

[0010] (4) twisting the dried fibers to obtain heat-insulating and energy-storing yarns;

[0011] The padding solution in step (2) is prepared by the following method: the temperature-regulating nano-microcapsules of higher alkanes, waterborne polyurethane and deionized water are prepared in a mass ratio of 1:2:7, and then mixed with deionized water in a mass ratio of 1:1.

[0012] Furthermore, in step (2), the fiber is immersed in the impregnation liquid for 10 seconds.

[0013] Furthermore, the drying conditions in step (3) are: temperature 160° C., time 180 s.

[0014] Furthermore, after the impregnation treatment in step (3), the liquid extraction rate of the fiber is 60%-70%.

[0015] Furthermore, after step (2), the method further comprises step (201): after the soaking liquid is stored for 2-8 hours, it is filtered using a filter screen or fine cloth with a mesh size of 100 or above, and after confirming that there is no obvious foreign matter, step (3) is performed.

[0016] Furthermore, after step (4), the method further comprises the following steps:

[0017] (5) performing plasma cleaning on the surface of the second fiber;

[0018] (6) melt-extruding the second fiber and coating the yarn obtained in step (4) at a coating ratio of sheath:core=3:1 to obtain a core-covered yarn;

[0019] (7) The core-wrapped yarn is sequentially cold-cut, oiled, and rolled to obtain a heat-insulating and energy-storing composite yarn.

[0020] Furthermore, the winding speed in step (7) is 100 m / min.

[0021] Furthermore, the yarn obtained in step (4) is used as the core yarn, which can be made of high-strength materials such as polypropylene, polyester, nylon, polyarylate, polyimide, etc.

[0022] The present invention also provides a yarn with heat insulation and energy storage properties, which is prepared by any of the above preparation methods.

[0023] Different from the existing technology, the above technical scheme mixes the temperature-regulating nano-microcapsules of higher alkanes with water-soluble resins, polyurethanes, acrylic acid and other coatings in a certain proportion to prepare a coating aid, and then treats the yarn by coating to obtain yarn with phase change, heat insulation and energy storage.

[0024] ① The fabric made of this kind of yarn is traditionally woven first and then coated. It has better air permeability and can automatically absorb or release latent heat to the environment within a certain temperature range by utilizing the phase or structural changes of the material itself, thereby achieving the purpose of regulating the ambient temperature.

[0025] ② The coated material has generally improved wear resistance based on its original high strength, and sand grinding can provide more than 50 turns. DETAILED DESCRIPTION

[0026] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments.

[0027] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0028] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0029] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0030] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0031] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0032] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0033] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments, which is only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and does not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0034] The present invention provides a method for preparing a yarn having heat insulation and energy storage properties, comprising the following steps:

[0035] (1) Plasma cleaning treatment is performed on the surface of the first fiber. The first fiber can be made of high-strength polyester fiber (300D / 96F). The plasma equipment model used is RFR1000-80 atmospheric pressure plasma cleaning machine with a power of 80w, an argon gas flow rate of 1L / min, and a speed controlled at 10m / min.

[0036] Plasma treatment of the fiber surface has the following effects: 1. Efficient decontamination and purification: remove grease, dust and other organic pollutants on the fiber surface without the use of harmful solvents, and improve the surface purity. 2. Surface energy enhancement: improve the wettability of the fiber surface to water or solvents, and optimize the subsequent coating process. 3. Improve wettability: adjust the fiber surface to make it more suitable for the hydrophilic or hydrophobic properties required for specific applications. 4. Enhanced bonding performance: strengthen the adhesion between the fiber and other materials to produce a stronger composite material. 5. Physical treatment, non-destructive fiber: non-invasive physical treatment process protects the original structure and mechanical properties of the fiber from damage. 6. Environmental protection and energy saving: clean production process, reduce waste emissions, use electricity and gas resources, in line with the trend of sustainable development.

[0037] (2) preparing padding solution;

[0038] (3) soaking, squeezing and drying the fibers;

[0039] (4) twisting the dried fibers to obtain heat-insulating and energy-storing yarns;

[0040] The padding solution in step (2) is prepared by the following method: the temperature-regulating nano-microcapsules of higher alkanes, water-based polyurethane, and deionized water are prepared in a mass ratio of 1:2:7, and then mixed with deionized water in a mass ratio of 1:1. The padding solution after preparation is a water-based polyurethane coating with a solid content of 15%, where the solid content refers to the weight percentage of the temperature-regulating capsule polyurethane in the coating, relative to the total weight of the coating.

[0041] Preferably, the fiber is immersed in the impregnation liquid for 10 seconds in step (2). According to factors such as the fluidity, temperature, and fiber porosity of the impregnation liquid, a qualified impregnation effect can be achieved when the impregnation time is 10 seconds, and the impregnation time is short, which improves production efficiency while ensuring product quality.

[0042] Preferably, the drying conditions in step (3) are: temperature 160°C, time 180s. Taking into account the characteristics of the fiber material, moisture content, drying method and required drying effect, this embodiment provides a better solution that can control the moisture content of the fiber within a suitable range.

[0043] Preferably, after the impregnation treatment in step (3), the liquid-carrying rate of the fiber is 60%-70%. The liquid-carrying rate (liquid-carrying rate) has a significant effect on the fiber performance. The liquid-carrying rate refers to the percentage of the weight of the impregnation liquid carried by the fiber after the impregnation treatment to the original dry cloth weight. Factors affecting the liquid-carrying rate include roller pressure, fiber hydrophilicity, etc. The calculation formula of the liquid-carrying rate (liquid-carrying rate) is: liquid-carrying rate = (fiber weight after liquid-carrying - fiber weight before liquid-carrying) / fiber weight before liquid-carrying * 100%. The present invention needs to maintain the liquid-carrying rate between 60% and 70% to ensure that the surface of the fiber is coated with sufficient temperature-regulating nano-microcapsules, thereby ensuring its heat insulation and energy storage properties.

[0044] Preferably, after step (2), the method further comprises step (201): after the impregnation liquid is stored for 2-8 hours, it is filtered using a filter screen or fine cloth with a mesh size of 100 or more, and after confirming that there is no obvious foreign matter, step (3) is performed. In the fiber processing process, padding is to put the fiber into a padding tank containing the impregnation liquid, and then use a roller to roll and finish it. When rolling the fabric, the roller is easy to adhere to the fibers on the fabric, and these adhered fibers will flow into the padding tank with the impregnation liquid rolled out, so that the impregnation liquid in the padding tank contains more and more fiber impurities, affecting the quality of the fabric. By allowing the impregnation liquid to stand for a period of time, the impurities can be pre-precipitated, and then filtered, so as to ensure the cleanliness of the impregnation liquid and prevent fabric quality problems caused by excessive impurities. If the impurities in the impregnation liquid are not filtered out, they may affect the appearance and quality of the final product.

[0045] The breaking strength of the yarn made of the fiber used in this embodiment before coating the temperature-regulating nano-microcapsules is greater than 6cn / dtex, and the breaking strength of the heat-insulating and energy-storing yarn obtained by the preparation method of this embodiment is greater than 4.5cn / dtex. The fabric made of the heat-insulating and energy-storing yarn has a slower heating rate and a slower cooling rate than the fabric made of ordinary polyester fiber, and is maintained at 30°C for a certain period of time.

[0046] Preferably, after step (4), the method further comprises the following steps:

[0047] (5) Plasma cleaning treatment is performed on the surface of the second fiber; the second fiber is a high-strength polyester fiber (300D / 96F).

[0048] By plasma surface treatment on the fiber surface, the colloid energy can be decomposed, hydrophilic groups can be formed on the fiber surface, and fine cracks can be formed. After such treatment, the capillary effect of the fiber can be significantly improved, the surface wettability of the fiber can be significantly improved, and the roughness can be increased.

[0049] (6) Melt-extrude the second fiber and coat it on the yarn obtained in step (4) at a coating ratio of skin: core = 3:1 to obtain a core-wrapped yarn. The melt-extruded material is a POE composite slice of the MP33 model with about 40% phase change. The yarn obtained in step (4) is used as the core yarn, which can be made of high-strength polypropylene, polyester, nylon, polyarylate, polyimide and other materials.

[0050] (7) The core-wrapped yarn is sequentially cold-cut, oiled, and rolled to obtain a heat-insulating and energy-storing composite yarn. The core-wrapped yarn passes through a cold water tank for 3 m and a cold water tank (the water temperature is controlled at less than 6°C), and is cold-cut, oiled, and rolled.

[0051] Preferably, the winding speed in step (7) is 100 m / min.

[0052] The fabric made of the heat-insulating and energy-storing composite yarn obtained in this embodiment has a slower heating rate and a slower cooling rate than the fabric made of ordinary polyester fibers, and can be maintained at 30°C for a certain period of time.

[0053] The present invention also provides a yarn with heat insulation and energy storage properties, which is prepared by any of the above preparation methods.

[0054] The invention prepares a coating auxiliary agent by mixing temperature-regulating nanometer microcapsules of higher alkanes with water-soluble resins, polyurethane, acrylic acid and other coatings in a certain proportion, and then treats the yarn by coating to obtain yarn with phase change, heat insulation and energy storage.

[0055] ① The fabric made of this kind of yarn is traditionally woven first and then coated. It has better air permeability and can automatically absorb or release latent heat to the environment within a certain temperature range by utilizing the phase or structural changes of the material itself, thereby achieving the purpose of regulating the ambient temperature.

[0056] ② The coated material has generally improved wear resistance based on its original high strength, and sand grinding can provide more than 50 turns.

[0057] It should be noted that, although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present invention specification, directly or indirectly applying the above technical solutions to other related technical fields are all included in the patent protection scope of the present invention.

Claims

1. A method for preparing a yarn with heat insulation and energy storage, characterized in that: The following steps are involved: (1) performing plasma cleaning on the surface of the first fiber; (2) preparing padding solution; (3) soaking, squeezing and drying the fibers; (4) twisting the dried fibers to obtain heat-insulating and energy-storing yarns; The padding solution in step (2) is prepared by the following method: the temperature-regulating nano-microcapsules of higher alkanes, waterborne polyurethane and deionized water are prepared in a mass ratio of 1:2:7, and then mixed with deionized water in a mass ratio of 1:

1.

2. The method for preparing a yarn with heat insulation and energy storage according to claim 1, characterized in that: In step (2), the fiber is immersed in the impregnation liquid for 10 seconds.

3. The method for preparing a yarn with heat insulation and energy storage according to claim 2, characterized in that: The drying conditions in step (3) are: temperature 160° C., time 180 s.

4. The method for preparing a yarn with heat insulation and energy storage according to claim 3, characterized in that: After the impregnation treatment in step (3), the liquid extraction rate of the fiber is 60%-70%.

5. The method for preparing a yarn with heat insulation and energy storage according to claim 4, characterized in that: After step (2), the method further includes step (201): after the soaking liquid is stored for 2-8 hours, it is filtered using a filter screen or fine cloth with a mesh size of 100 or above, and after confirming that there is no obvious foreign matter, step (3) is performed.

6. A method for preparing a yarn with heat insulation and energy storage according to claim 5, characterized in that: After step (4), the method further includes the following steps: (5) performing plasma cleaning on the surface of the second fiber; (6) melt-extruding the second fiber and coating the yarn obtained in step (4) at a coating ratio of sheath:core=3:1 to obtain a core-covered yarn; (7) The core-wrapped yarn is sequentially cold-cut, oiled, and rolled to obtain a heat-insulating and energy-storing composite yarn.

7. A method for preparing a yarn with heat insulation and energy storage according to claim 6, characterized in that: The winding speed in step (7) is 100 m / min.

8. The method for preparing a yarn with heat insulation and energy storage according to claim 7, characterized in that: The yarn obtained in step (4) is used as the core yarn, which can be made of high-strength materials such as polypropylene, polyester, nylon, polyarylate, polyimide, etc.

9. A yarn with heat insulation and energy storage, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 8.