Optical thermal coupling thermal fabric and preparation method thereof

Abstract

The invention provides an optical thermal coupling warm-keeping fabric and a preparation method thereof, light-absorbing yarns and heat-reflecting yarns are woven into a double-layer structure with one side provided with the heat-reflecting yarns and the other side provided with the light-absorbing yarns by using a textile process, and a hollow heat-insulating material is used as a weft filling core and is placed into the double-layer structure, so that the heat-absorbing and heat-reflecting warm-keeping fabric is obtained. The optical thermal coupling thermal fabric is obtained. By combining the heat reflection yarn and the light absorption yarn, the fabric can effectively reflect heat emitted by a human body, reduce heat loss, absorb external light energy and convert the light energy into heat energy, and improve the warm keeping effect, the hollow heat insulation material increases the volume of a static air layer, and the warm keeping effect is further improved on the premise that the flexibility of the fabric is not affected. The preparation process is simple, the efficient, warm-keeping, comfortable and environment-friendly warm-keeping fabric is provided through the textile technology and material combination, and the fabric has wide application prospects and commercial value.

Description

Technical Field

[0001] The invention relates to the field of textile technology, and in particular to an optical-thermal coupling warm-keeping fabric and a preparation method thereof. Background Art

[0002] Natural materials such as silk, cotton, and industrial hemp are widely used in the traditional textile field to achieve the warmth and comfort of clothing. Traditional thermal clothing often relies on heavy materials and multiple layers to achieve the warmth effect, which not only limits the wearer's freedom of movement, but also increases the heavy feeling of wearing. Therefore, traditional textiles can no longer meet the modern diversified and functional needs, especially in the fields of outdoor sports, medical care, etc., which put forward higher requirements for the warmth, breathability, and moisture permeability of textiles. Traditional thermal insulation materials, such as pure cotton fabrics, although they have good breathability and moisture permeability, have limited thermal insulation performance under extreme climatic conditions, and it is difficult to effectively isolate the impact of the external low temperature environment on the human body. Some high-tech materials, such as Mylar blanket, can provide better thermal insulation, but their breathability is poor, and long-term use can easily cause human discomfort.

[0003] In order to regulate the heat exchange (infrared radiation flow) between the human body and the surrounding environment, the research on advanced materials with the function of controlling human thermal radiation has attracted widespread attention. Infrared transparent radiation textiles, emitting radiation textiles, solar reflective radiation cooling textiles and conductive cooling textiles with enhanced thermal conductivity have achieved certain results in keeping cool in warm environments. On the contrary, in cold climates, textiles with warming effects are urgently needed to reduce heat loss to the surrounding environment. At present, thermal insulation materials such as porous aerogel fibers and infrared reflective materials combined with metal particles and metal wires have achieved certain results in reducing heat loss. However, there are still technical bottlenecks to realize the self-heating function of textiles to compensate for the heat dissipation of infrared radiation. Therefore, the research and development of textiles with self-heating functions has become a hot topic in current research.

[0004] In view of this, it is necessary to design an improved optical-thermal coupling thermal insulation fabric and a preparation method thereof to solve the above problems. Summary of the invention

[0005] In view of the defects of the above-mentioned prior art, the purpose of the present invention is to provide an optical-thermal coupling thermal insulation fabric and a preparation method thereof. Through a textile process, a double-layer structure is woven by using light-absorbing yarn and heat-reflective yarn, combined with a hollow tubular insulation material, to increase the light absorption and improve the thermal insulation effect.

[0006] To achieve the above object, the present invention provides a method for preparing an optical-thermal coupling thermal insulation fabric, comprising the following steps:

[0007] Light-absorbing yarn and heat-reflective yarn are woven into a double-layer structure with one side being the heat-reflective yarn and the other side being the light-absorbing yarn by using a textile process, and hollow heat-insulating material is placed in the double-layer structure as a weft yarn core to obtain an optical-thermal coupling thermal insulation fabric.

[0008] As a further improvement of the present invention, the light-absorbing yarn has an absorptivity of more than 90% in the solar light band of 280 to 2500 nm.

[0009] As a further improvement of the present invention, the light-absorbing yarn is made by modifying the surface of a non-light-absorbing yarn with a light-absorbing material; or, the light-absorbing yarn is made by mixed spinning of a light-absorbing material and a polymer material.

[0010] Furthermore, the light-absorbing material is one of carbonized tube, graphene, zirconium carbide, polypyrrole and carbon black; the non-light-absorbing yarn is one of cotton fiber, wool fiber, silk fiber and regenerated cellulose fiber; the polymer material is one of polyurethane, polylactic acid and polyester.

[0011] As a further improvement of the present invention, the heat-reflective yarn is a natural fiber or a chemical fiber obtained by metal surface modification; the natural fiber is one of cotton fiber, wool fiber, and silk fiber; the chemical fiber is one of polyester, acrylic fiber, and regenerated cellulose fiber.

[0012] As a further improvement of the present invention, the hollow heat-insulating material is one of a hollow silicone tube, a polyethylene hollow tube and a polyurethane hollow tube.

[0013] Furthermore, the inner diameter of the hollow heat-insulating material is 0.4 to 0.8 mm.

[0014] As a further improvement of the present invention, the textile process is weaving or knitting, and the weaving method is: using the heat-reflective yarn and the light-absorbing yarn as warp yarns, adopting a double-layer structure, and weaving the heat-reflective yarn, the light-absorbing yarn and the hollow insulation material into a double-sided core-filled fabric.

[0015] The knitting method is: using the heat-reflective yarn and the light-absorbing yarn as main yarns, adopting a weft knitting method, and using the hollow heat-insulating material as the core-filling yarn for weft weaving to obtain a double-sided core-filling fabric.

[0016] The present invention also provides an optical-thermal coupling thermal insulation fabric, which is prepared by the above-mentioned preparation method.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides an optical-thermal coupling thermal insulation fabric and a preparation method thereof. The light-absorbing yarn and the heat-reflecting yarn are woven into a double-layer structure with one side being the heat-reflecting yarn and the other side being the light-absorbing yarn by a textile process. A hollow thermal insulation material is placed in the double-layer structure as a weft yarn core to obtain an optical-thermal coupling thermal insulation fabric. The present invention adopts a double-sided design to superimpose optical and thermal coupling, changes the mutual radiation energy exchange between the skin, fabric and the environment, and combines the hollow thermal insulation material to increase the light absorption and improve the warming effect. The preparation process of the present invention is simple. Through the combination of textile technology and materials, a thermal insulation fabric with high efficiency, warmth retention, comfort and environmental protection is provided, which has broad application prospects and commercial value.

[0019] By combining heat-reflective yarn and light-absorbing yarn, the fabric can effectively reflect the heat emitted by the human body, reduce heat loss, and absorb external light energy into heat energy, thereby improving the warmth-keeping effect. The light-absorbing yarn absorbs light energy and converts it into heat energy, thereby achieving effective management and utilization of heat. Using external light energy as a supplement to heat energy reduces dependence on traditional energy sources, and has certain energy-saving and environmental protection benefits.

[0020] The present invention adopts a core-filling structure combined with a hollow tubular heat-insulating material to increase the volume of the static air layer and improve the warmth-keeping effect without affecting the flexibility of the fabric.

[0021] The double-sided coupled fabric of the present invention shows lower thermal conductivity than other common textiles, and the outdoor temperature insulation data on sunny days show that the fabric has a higher temperature difference of more than 10°C and 5°C compared with the double-sided pure cotton sample without special treatment and the Mylar blanket sample. Compared with the Mylar blanket sample and the pure cotton woven fabric of the same thickness, the optical thermal coupling thermal insulation fabric of the present invention has excellent air permeability, and its moisture permeability is close to that of the pure cotton fabric, achieving a balance between functionality and comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the optical-thermal coupling thermal insulation fabric provided by the present invention.

[0023] Figure 2 This is a schematic cross-sectional view of the optical-thermal coupling thermal insulation fabric provided by the present invention.

[0024] Figure 3 This is a cross-sectional 3D microscope image of the optical-thermal coupling thermal insulation fabric provided in Example 1 of the present invention.

[0025] Figure 4 This is a solar absorption spectrum diagram of the thermal insulation fabric provided in Example 1 of the present invention and Comparative Example 1.

[0026] Figure 5The thermal insulation fabric provided in Example 1 and Comparative Example 2 of the present invention is 100W / m 2 Thermal insulation effect at heating power.

[0027] Figure 6 The thermal insulation fabric provided in Example 1 and Comparative Example 2 of the present invention is 200W / m 2 Thermal insulation effect at heating power.

[0028] Figure 7 The thermal insulation fabric provided in Example 1 and Comparative Example 2 of the present invention is 300W / m 2 Thermal insulation effect at heating power.

[0029] Figure 8 The thermal insulation data of the thermal insulation fabrics provided in Example 1 of the present invention and Comparative Examples 1 and 3 on sunny days.

[0030] Fig. 9 These are the test results of the air permeability of the thermal insulation fabrics provided by Example 1 of the present invention and Comparative Examples 1 and 3.

[0031] Fig.10 These are the test results of the moisture permeability of the thermal insulation fabrics provided by Example 1 of the present invention and Comparative Examples 1 and 3.

[0032] Reference numerals

[0033] 1. Light-absorbing yarn; 2. Hollow insulation material; 3. Heat-reflective yarn. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0036] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0037] The present invention provides a method for preparing an optical-thermal coupling thermal insulation fabric, comprising the following steps:

[0038] The light-absorbing yarn 1 and the heat-reflecting yarn 3 are woven into a double-layer structure with one side being the heat-reflecting yarn 3 and the other side being the light-absorbing yarn 1 by a textile process, and a hollow heat-insulating material 2 is placed in the double-layer structure as a weft yarn core to obtain an optically thermally coupled warm fabric.

[0039] Specifically, the light-absorbing yarn 1 is preferably a yarn with an absorptivity of more than 90% in the solar light band of 280 to 2500 nm, which can efficiently absorb most wavelengths of sunlight and convert them into heat energy.

[0040] The light-absorbing yarn 1 is made by modifying the surface of a non-light-absorbing yarn with a light-absorbing material, that is, coating or chemically bonding the light-absorbing material to the surface of the non-light-absorbing yarn; or, by spinning a light-absorbing material and a polymer material together, that is, directly mixing the light-absorbing material with the polymer material and then spinning the yarn. By selecting the appropriate light-absorbing material and non-light-absorbing yarn, warmth retention, comfort and durability can be balanced.

[0041] The light-absorbing material is one of carbon tube, graphene, zirconium carbide, polypyrrole and carbon black; the non-light-absorbing yarn is one of cotton fiber, wool fiber, silk fiber and regenerated cellulose fiber; the polymer material is one of polyurethane, polylactic acid and polyester.

[0042] The heat-reflective yarn 3 is obtained by modifying the surface of natural fiber or chemical fiber with metal; the natural fiber is one of cotton fiber, wool fiber and silk fiber; the chemical fiber is one of polyester, acrylic fiber and regenerated cellulose fiber. By depositing metal on the fiber surface, the fiber can reflect heat radiation and provide heat insulation effect. The metal used for surface modification includes a metal element and one of its oxides, hydroxides, carbides, nitrides and sulfides. The metal element is one of silver, aluminum, copper, gold, nickel, chromium and titanium. The fiber surface modification is achieved by chemical plating, electroplating, vacuum plating and the like.

[0043] The hollow heat-insulating material 2 is one of a hollow silicone tube, a polyethylene hollow tube and a polyurethane hollow tube, and the inner diameter of the hollow heat-insulating material 2 is preferably 0.4 to 0.8 mm. By arranging the hollow heat-insulating material 2 in the double-layer fabric, the volume of the static air layer is increased, and the heat loss is effectively reduced. The hollow tubular structure helps to maintain the air permeability of the fabric and improve the warmth retention effect without affecting the flexibility of the fabric.

[0044] In some specific embodiments, the method of using the light-absorbing material polypyrrole for surface modification of non-light-absorbing yarn also includes placing the non-light-absorbing yarn in a polypyrrole solution for treatment, placing it in a ferric chloride solution for stirring, and drying it for standby use. Specifically, the non-light-absorbing yarn is placed in a polypyrrole solution for treatment for 25 to 35 minutes, then immersed in a 5 to 10% ferric chloride solution while being magnetically stirred for 1.5 to 2.5 hours, and finally dried at 50 to 70°C for 2 to 3 hours for standby use. After the yarn is modified with polypyrrole and ferric chloride, it can better absorb light energy and convert it into heat energy, thereby enhancing the warmth-keeping effect.

[0045] The textile process is weaving or knitting. The weaving method is: the heat-reflective yarn 3 and the light-absorbing yarn 1 are used as warp yarns, and the heat-reflective yarn 3, the light-absorbing yarn 1 and the hollow heat-insulating material 2 are woven into a double-sided core-filled fabric by using a double-layer structure; the knitting method is: the heat-reflective yarn 3 and the light-absorbing yarn 1 are used as the main yarns, and the hollow heat-insulating material 2 is used as the core-filled yarn for weft weaving to obtain a double-sided core-filled fabric.

[0046] The optical thermal coupling thermal insulation fabric is obtained by the above method, and its structural schematic diagram is shown as follows: Figure 1 The cross-sectional diagram is shown in Figure 2 shown.

[0047] The preparation method of the optical-thermal coupling thermal insulation fabric provided by the present invention is described below with reference to specific embodiments.

[0048] Example 1

[0049] Embodiment 1 provides a method for preparing an optical-thermal coupling thermal insulation fabric, comprising the following steps:

[0050] S1. After the cotton thread was immersed in a polypyrrole solution for 30 minutes, it was placed in a 5% ferric chloride solution with magnetic stirring for 2 hours, and dried at 60°C for 2 hours to obtain PPy-FeCl3 yarn;

[0051] S2. Silver-plated yarn and PPy-FeCl3 yarn are used as warp yarns, and the wefting sequence is 1, 5, 2, 6, 3, 7, 4, and 8. Silver-plated yarn is used as the warp yarn for the surface warp, and PPy-FeCl3 yarn is used for the inner warp. The machine adopts a double-layer structure. During the weft beating process, the surface warp is interwoven with the silver-plated yarn, and the inner warp is interwoven with the PPy-FeCl3 yarn. After weaving a length of 3 mm, a hollow silicone tube with an inner diameter of 0.5 mm is filled in. The plain weave stage is adopted, and then the surface and inner binding structure is replaced. The above operation is repeated to complete the weaving of the double-sided core-filled fabric, and an optical thermal coupling thermal insulation fabric is obtained. The cross-sectional 3D microscope image is shown as follows. Figure 3 As shown, it can be seen that the prepared optical thermal coupling thermal insulation fabric has a double-layer structure with a hollow silicone tube in the middle.

[0052] Example 2

[0053] Embodiment 2 provides a method for preparing an optical-thermal coupling thermal insulation fabric, comprising the following steps:

[0054] S1. After the cotton thread was immersed in a polypyrrole solution for 30 minutes, it was placed in a 10% ferric chloride solution with magnetic stirring for 2 hours, and dried at 60°C for 2 hours to obtain PPy-FeCl3 yarn;

[0055] S2. Use weft knitting technology to weave silver-plated yarn and PPy-FeCl3 yarn into a double-layer structure with one side of silver-plated yarn and the other side of PPy-FeCl3 yarn. Place the hollow silicone tube as the weft yarn core into the double-layer structure to obtain an optically thermally coupled thermal insulation fabric.

[0056] Comparative Example 1

[0057] Comparative Example 1 provides a method for preparing an optical-thermal coupling thermal insulation fabric. Compared with Example 1, the only difference is that the cotton thread is not treated with polypyrrole and ferric chloride, and other experimental parameters and conditions are basically the same as those in Example 1, which will not be repeated here.

[0058] Comparative Example 2

[0059] Comparative Example 2 provides a method for preparing an optical-thermal coupling thermal insulation fabric. Compared with Example 1, the only difference is that no hollow silicone tube is added. Other experimental parameters and conditions are basically the same as those in Example 1 and will not be repeated here.

[0060] Comparative Example 3

[0061] Comparative Example 3 is a commercially available Mylar blanket sample.

[0062] The optical thermal coupling thermal insulation fabric prepared by the present invention is cut according to the required size and shape to ensure that the area of ​​each piece of fabric is uniform. Figure 4 The figure shows the solar absorption spectra of the optical thermal coupling thermal insulation fabrics prepared in Example 1 of the present invention and Comparative Example 1. It can be seen that the absorption percentage of the sample prepared in Example 1 is close to 100%, and remains relatively stable in the entire wavelength range, which indicates that the sample in Example 1 has an extremely high absorption capacity for solar radiation and can effectively absorb the heat in solar radiation. This high absorption capacity is related to the special composition or structure of the sample, which enables it to maximize the use of solar radiation to provide a warming effect; while the absorption percentage of the sample in Comparative Example 1 fluctuates around 50%, which indicates that the absorption capacity of the sample in Comparative Example 1 for solar radiation is relatively low and changes with the change of wavelength, affecting its absorption efficiency for solar radiation.

[0063] The thermal insulation performance test was carried out under the condition of indoor ambient temperature of 22℃. Figures 5 to 7 As shown, the thermal insulation performance of the thermal coupling thermal insulation fabric and the sample of comparative example 2 without silicone tube filling was tested by heating the heat body with powers of 100W, 200W and 300W respectively. The results showed that the thermal insulation effect of the thermal insulation fabric with silicone tube of the present invention was nearly 2°C higher than that without silicone tube, and it had excellent thermal insulation performance.

[0064] Figure 8 The outdoor insulation data of the warm-keeping fabric on a sunny day provided for Example 1 and Comparative Examples 1 and 3 show that the fabric of the present application has a temperature difference of more than 10°C and 5°C compared with the pure cotton sample without special treatment and the Mylar blanket sample, respectively, indicating that it has a significant insulation effect under natural daylight conditions.

[0065] Fig. 9 The test results of the air permeability of the thermal insulation fabrics provided in Example 1 and Comparative Examples 1 and 3 show that the optical thermal coupling thermal insulation fabric provided in the present application has excellent air permeability compared with the Mylar blanket sample and the pure cotton woven fabric of the same thickness.

[0066] Fig.10 From the test results of the moisture permeability of the thermal insulation fabrics provided in Example 1 of the present invention and Comparative Examples 1 and 3, it can be seen that the moisture permeability of the optical thermal coupling thermal insulation fabric provided in the present application is close to that of the pure cotton fabric, indicating that the fabric of the present invention successfully maintains good moisture permeability while enhancing the thermal insulation performance, thus achieving a balance between functionality and comfort.

[0067] In summary, the present invention adopts a double-sided design to superimpose optical and thermal coupling, which can effectively reflect the heat emitted by the human body and reduce heat loss. At the same time, it absorbs external light energy and converts it into thermal energy to improve the warmth retention effect. Combined with the hollow insulation material 2, the volume of the static air layer is increased to further improve the warmth retention effect.

[0068] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for preparing an optical-thermal coupling thermal insulation fabric, characterized in that: The following steps are involved: Light-absorbing yarn and heat-reflective yarn are woven into a double-layer structure with one side being the heat-reflective yarn and the other side being the light-absorbing yarn by using a textile process, and hollow heat-insulating material is placed in the double-layer structure as a weft yarn core to obtain an optical-thermal coupling thermal insulation fabric.

2. The method for preparing the optical thermal coupling thermal insulation fabric according to claim 1, characterized in that: The light-absorbing yarn has an absorption rate of more than 90% in the solar light band of 280 to 2500 nm.

3. The method for preparing the optical thermal coupling thermal insulation fabric according to claim 2, characterized in that: The light-absorbing yarn is made by modifying the surface of a non-light-absorbing yarn with a light-absorbing material; Alternatively, the light-absorbing yarn is obtained by mixing and spinning a light-absorbing material and a polymer material.

4. The method for preparing the optical thermal coupling thermal insulation fabric according to claim 3, characterized in that: The light-absorbing material is one of carbon tube, graphene, zirconium carbide, polypyrrole and carbon black; the non-light-absorbing yarn is one of cotton fiber, wool fiber, silk fiber and regenerated cellulose fiber; the polymer material is one of polyurethane, polylactic acid and polyester.

5. The method for preparing the optical thermal coupling thermal insulation fabric according to claim 1, characterized in that: The heat-reflective yarn is a natural fiber or a chemical fiber obtained by metal surface modification; the natural fiber is one of cotton fiber, wool fiber, and silk fiber; the chemical fiber is one of polyester, acrylic fiber, and regenerated cellulose fiber.

6. The method for preparing the optical thermal coupling thermal insulation fabric according to claim 1, characterized in that: The hollow heat-insulating material is one of a hollow silicone tube, a polyethylene hollow tube and a polyurethane hollow tube.

7. The method for preparing the optical thermal coupling thermal insulation fabric according to claim 6, characterized in that: The inner diameter of the hollow heat insulating material is 0.4-0.8 mm.

8. The method for preparing the optical thermal coupling thermal insulation fabric according to claim 1, characterized in that: The textile process is weaving or knitting, and the weaving method is: using the heat-reflective yarn and the light-absorbing yarn as warp yarns, using a double-layer structure, and weaving the heat-reflective yarn, the light-absorbing yarn and the hollow insulation material into a double-sided core-filled fabric.

9. The method for preparing the optical thermal coupling thermal insulation fabric according to claim 8, characterized in that: The knitting method is: using the heat-reflective yarn and the light-absorbing yarn as main yarns, adopting a weft knitting method, and using the hollow heat-insulating material as the core-filling yarn for weft weaving to obtain a double-sided core-filling fabric.

10. An optical thermal coupling thermal insulation fabric, characterized in that: Prepared by the preparation method according to any one of claims 1 to 9.

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