Cloth structure with radiative cooling coating and method of making the same

Abstract

The application provides a cloth structure with a radiation refrigeration coating and a preparation method thereof, the cloth structure comprising a cloth layer, a microsphere layer and a composite material layer, the cloth layer, the microsphere layer and the composite material layer being sequentially arranged from bottom to top, the thickness of the microsphere layer being 0.05-0.2 microns, and the thickness of the composite material layer being 0.05-0.15 microns; the component and the usage ratio of the microsphere layer being white PU glue:microsphere = 1:(0.01-0.04), and the microsphere being azodicarbonamide; the component and the usage ratio of the composite material layer being transparent PU glue:ATO tin antimony oxide powder:phase change material powder = 1:(0.01-0.09):(0.01-0.09), and the component of the phase change material powder comprising polyformaldehyde melamine, styrene-maleic anhydride and n-hexadecane. The application has the characteristics of good cooling effect, fast cooling speed, fast process speed, good comfort and washing resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to a cloth structure with a radiative cooling coating and a preparation method thereof. BACKGROUND

[0002] Radiative cooling technology can be used as a non-energy-consuming temperature adjustment method, which is practical, energy-saving and environmentally friendly, and has attracted widespread attention. Existing cooling technology has the following methods:

[0003] 1. Photonic structure material based on biomimetic principle: inspired by the synergistic effect of light and heat on polar bear fur, a thin film of polydimethylsilane is combined with a highly scattering aerogel of polyethylene to develop a flexible, super-hydrophobic and reusable cooling "skin", with a solar radiation reflectivity of up to 96% and a thermal radiation emissivity of up to 80%.

[0004] 2. Multilayer system: for multilayer films, the number of layers and thickness are important parameters that affect the performance and spectral characteristics. In the process of preparing multilayer films, it is difficult to maintain the thickness of the thin film, which will affect its optical properties. Therefore, it is also necessary to control the number and thickness of the multilayer film to ensure its performance in practical applications. For complex planar structures with a large number of f-nanometer layers and two-dimensional photonic structures, the cost is extremely high using existing technology. Therefore, reducing the cost is a major challenge in practical applications. In addition, due to the limitations of technology and equipment, it is currently difficult to achieve large-scale production.

[0005] 3. Nanoparticle-doped polymer thin film: silver surface coated with TPX (poly-4-methyl-1 pentene) doped with SiO2 and CaMoO4 nanoparticles as a thermal emission layer. Due to the asymmetric vibration of O-Si-O in SiO2 and Mo-O in CaMoO4 in the stretching mode, the wavelength of thermal radiation has a good match with the wavelength of the atmospheric transparent window. By controlling the concentration of doped nanoparticles through the plasma frequency, the material produces resonance within the atmospheric window, improving the emissivity of mid-infrared waves.

[0006] 4. Electrospun polymer with porous structure: In recent years, electrospinning technology has been used to prepare fibers with micro-nano pores to achieve passive daytime radiative cooling. Compared with other technologies, it has obvious advantages such as low production cost and simple preparation process. In the electrospinning method, the fiber diameter can be easily adjusted from a few nanometers to a few microns by changing the process parameters. In addition, the secondary structure (such as porous, hollow or core-shell) and disordered arrangement of these fibers can effectively scatter visible light and emit infrared light. SUMMARY

[0007] The present application aims to solve the technical problem of providing a cloth structure with a radiation refrigeration coating and a preparation method thereof, which has the characteristics of good cooling effect, fast cooling speed, fast process speed, good comfort and washing resistance.

[0008] The present application is implemented as follows:

[0009] A cloth structure with a radiation refrigeration coating, the cloth structure comprising a cloth layer, a microsphere layer and a composite material layer, the cloth layer, the microsphere layer and the composite material layer being sequentially arranged from bottom to top, the thickness of the microsphere layer being 0.05-0.2 μm, and the thickness of the composite material layer being 0.05-0.15 μm.

[0010] The component and its dosage ratio of the microsphere layer are white PU glue:microsphere = 1:(0.01-0.04), and the microsphere is azodicarbonamide; the component and its dosage ratio of the composite material layer are transparent PU glue:ATO tin antimony oxide powder:phase change material powder = 1:(0.01-0.09):(0.01-0.09), and the component of the phase change material powder comprises polyformaldehyde melamine, styrene-maleic anhydride and n-hexadecane.

[0011] Further, the thickness of the microsphere layer is 0.15 μm, and the thickness of the composite material layer is 0.1 μm.

[0012] Further, the dosage ratio of the component of the microsphere layer is white PU glue:microsphere = 1:0.02.

[0013] Further, the particle size of the microsphere is 10-16 μm.

[0014] Further, the particle size of the microsphere is 12 μm.

[0015] Further, the dosage ratio of the component of the composite material layer is transparent PU glue:ATO tin antimony oxide powder:phase change material powder = 1:0.05:0.05.

[0016] Further, the particle size of the ATO tin antimony oxide powder is 20-500 nm.

[0017] Further, the mass percentage content of the components in the phase change material powder is as follows: polyformaldehyde melamine 19.0-27.2%, styrene-maleic anhydride 5.8-7.2%, and n-hexadecane 66.0-72.0%.

[0018] Further, the white PU glue and the transparent PU glue are both water-based PU glue.

[0019] Further, a preparation method of the cloth structure with the radiation refrigeration coating as described, the method steps are as follows:

[0020] Step 1, the transparent PU glue, ATO tin oxide powder and phase change material powder are mixed uniformly by at least one of an ultrasonic oscillator and a stirrer for 0.5-1h, and then a uniformly dispersed composite coating is prepared; the composite coating is coated on the transfer film in a coating process or a silk screen printing manner, and then placed in a drying oven for baking at 60-80℃ for 1-2 minutes to form a composite material layer, and then taken out and cooled to room temperature;

[0021] Step 2, the white PU glue and the microspheres are mixed uniformly by at least one of an ultrasonic oscillator and a stirrer for 0.5-1h, and then a uniformly dispersed microsphere coating is prepared; the microsphere coating is coated on the composite material layer of the transfer film in a coating process or a silk screen printing manner, and then placed in a drying oven for baking at 120-150℃ for 5-10 minutes to form a microsphere layer;

[0022] Step 3, the cloth and the transfer film are pressed by using a hot press, and the front and back sides are pressed for 10-15s respectively.

[0023] The present application has the following advantages:

[0024] The cloth structure with the radiation refrigeration coating of the present application has the characteristics of fast cooling speed, good comfort and washing resistance under the conditions of low energy consumption and environmental friendliness. The present application combines the radiation refrigeration coating and the textile by using the transfer method, can better control the thickness of the radiation refrigeration coating, and has the advantages of fast process speed, local refrigeration coating and the like, and can obviously achieve the cooling effect. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic view of the cloth structure with the radiation refrigeration coating of the present application. DETAILED DESCRIPTION

[0027] Referring to Figure 1 The present application relates to a cloth structure with a radiation refrigeration coating, the cloth structure comprising a cloth layer 1, a microsphere layer 2 and a composite material layer 3, the cloth layer 1, the microsphere layer 2 and the composite material layer 3 being arranged in sequence from bottom to top, the thickness of the microsphere layer 2 being 0.05-0.2μm, and the thickness of the composite material layer 3 being 0.05-0.15μm.

[0028] The component and its usage ratio of the microsphere layer 2 are white PU glue:microsphere=1:(0.01-0.04), and the microsphere is azodicarbonamide; the component and its usage ratio of the composite material layer 3 are transparent PU glue:ATO tin-antimony oxide powder:phase change material powder=1:(0.01-0.09):(0.01-0.09), and the component of the phase change material powder includes polyformaldehyde melamine, styrene-maleic anhydride and n-hexadecane.

[0029] In the embodiment, preferably, the thickness of the microsphere layer 2 is 0.15 μm, and the thickness of the composite material layer is 0.1 μm.

[0030] In the embodiment, preferably, the usage ratio of the component of the microsphere layer 2 is white PU glue:microsphere=1:0.02.

[0031] In the embodiment, preferably, the particle size of the microsphere is 10-16 μm.

[0032] In the embodiment, preferably, the particle size of the microsphere is 12 μm.

[0033] In the embodiment, preferably, the usage ratio of the component of the composite material layer 3 is transparent PU glue:ATO tin-antimony oxide powder:phase change material powder=1:0.05:0.05.

[0034] In the embodiment, preferably, the particle size of the ATO tin-antimony oxide powder is 20-500 nm.

[0035] In the embodiment, preferably, the mass percentage of the component in the phase change material powder is as follows: polyformaldehyde melamine 19.0-27.2%, styrene-maleic anhydride 5.8-7.2%, and n-hexadecane 66.0-72.0%.

[0036] In the embodiment, preferably, the white PU glue and the transparent PU glue are both water-based PU glue.

[0037] The application also relates to a preparation method of the cloth structure with the radiation refrigeration coating.

[0038] Step 1: the transparent PU glue, the ATO tin-antimony oxide powder and the phase change material powder are stirred by at least one of an ultrasonic oscillator and a stirrer for 0.5-1 h to obtain a composite coating with uniform dispersion; the composite coating is coated on a transfer film by coating processing or silk screen printing, and then is placed in a drying oven for baking at 60-80 °C for 1-2 min to form a composite material layer, and then is taken out and cooled to room temperature. Step 2: the microsphere layer is prepared by coating the microsphere on the composite material layer by coating processing or silk screen printing, and then is placed in a drying oven for baking at 60-80 °C for 1-2 min to form a microsphere layer, and then is taken out and cooled to room temperature.

[0039] Step 2, the white PU glue and microspheres are mixed uniformly by at least one of an ultrasonic oscillator and a stirrer for 0.5-1h to prepare a microsphere coating; the microsphere coating is coated on the composite material layer of the transfer film in a coating process or a silk screen printing manner, and then placed in a drying oven for baking at 120-150℃ for 5-10 minutes to form a microsphere layer;

[0040] Step 3, the cloth and the transfer film are pressed by a hot press, and the front and back surfaces are pressed for 10-15s respectively.

[0041] The technical solutions of the present application will be described clearly and completely in combination with the specific embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. If the specific conditions are not specified in the embodiments, the conventional conditions or the conditions recommended by the manufacturer are used. If the reagents or instruments are not specified by the manufacturer, they are conventional products that can be purchased in the market.

[0042] I: Preparation of cloth structure with radiation cooling coating

[0043] Step 1, the transparent PU glue, ATO tin antimony oxide powder and phase change material powder PCM are mixed uniformly by at least one of an ultrasonic oscillator and a stirrer for 0.5-1h to prepare a composite coating; the composite coating is coated on the transfer film in a coating process or a silk screen printing manner, and then placed in a drying oven for baking at 60-80℃ for 1-2 minutes to form a composite material layer, and then taken out and cooled to room temperature;

[0044] Step 2, the white PU glue and microspheres are mixed uniformly by at least one of an ultrasonic oscillator and a stirrer for 0.5-1h to prepare a microsphere coating; the microsphere coating is coated on the composite material layer of the transfer film in a coating process or a silk screen printing manner, and then placed in a drying oven for baking at 120-150℃ for 5-10 minutes to form a microsphere layer;

[0045] Step 3, the cloth and the transfer film are pressed by a hot press, and the front and back surfaces are pressed for 10-15s respectively.

[0046] Test: The cloth structure is fixed at the window of a sealed box, a 220V, 500W incandescent lamp is turned on to irradiate the cloth structure for 30-60 seconds in a dark and sealed environment (a lampshade is arranged at the back of the incandescent lamp), and a thermal imager is used to measure the temperature difference between the front and back surfaces of the cloth structure.

[0047] II. Measurement results:

[0048] 1. The thickness of the selected composite material layer is 0.15 microns, and the content of each component is transparent PU glue: ATO: PCM = 1:0.05:0.05; the thickness of the micron sphere layer is 0.1 microns, and when different content components are selected, the temperature difference between the front and back of the cloth structure is as shown in Table 1 after 60 seconds:

[0049] Table 1

[0050]

[0051] 2. The content of each component of the selected micron sphere layer is white PU glue: micron sphere = 1:0.02; when the composite material layer selects different content components, the temperature difference between the front and back of the cloth structure is as shown in Table 2 after 60 seconds:

[0052] Table 2

[0053]

[0054] From the results of Tables 1-2, when the transparent PU glue: ATO: PCM = 1:0.05:0.05 of the composite material layer and the white PU glue: micron sphere = 1:0.02 of the micron sphere layer are combined, the radiation cooling performance of the coating is optimal, and the 60-second cooling performance reaches nearly 11.3℃.

[0055] 3. When the transparent PU glue: ATO: PCM = 1:0.05:0.05 of the composite material layer and the white PU glue: micron sphere = 1:0.02 of the micron sphere layer are combined, the temperature difference between the front and back of the coating cloth structure with different thicknesses of the composite material layer and the micron sphere layer after 50 times of washing is as shown in Table 3 after 60 seconds:

[0056] Table 3

[0057]

[0058] From the results of Table 3, the radiation cooling coating cloth structure prepared by using the composite material layer with a thickness of 0.15 microns and the micron sphere layer with a thickness of 0.1 microns can still achieve a temperature difference of 11.3℃ between the front and back of the cloth after 50 times of washing, which obviously has the characteristics of water resistance and high temperature difference.

[0059] In summary, the cloth structure with the radiation cooling coating of the present application has the characteristics of fast cooling speed, good comfort and water resistance under the conditions of low energy consumption and environmental friendliness. The present application combines the radiation cooling coating with the textile by using the transfer method, which can better control the thickness of the radiation cooling coating, and also has the advantages of fast process speed, local attachment of the cooling coating, etc., and can obviously achieve the effect of cooling.

[0060] While the foregoing description has described specific embodiments of the application, one ordinary skill in the art will appreciate that various modifications and changes can be made thereto without departing from the spirit and scope of the application, as set forth in the appended claims.

Claims

1. A fabric structure with a radiative cooling coating, characterized in that: The fabric structure includes a fabric layer, a micron ball layer and a composite material layer, wherein the fabric layer, the micron ball layer and the composite material layer are arranged in sequence from bottom to top, the thickness of the micron ball layer is 0.05 to 0.2 μm, and the thickness of the composite material layer is 0.05 to 0.15 μm; The components and usage ratio of the micron ball layer are white PU glue: micron ball = 1: (0.01-0.04), and the micron ball is azodicarbonamide; the components and usage ratio of the composite material layer are transparent PU glue: ATO antimony tin oxide powder: phase change material powder = 1: (0.01-0.09): (0.01-0.09), and the components of the phase change material powder include polyformal melamine, styrene-maleic anhydride and n-hexadecane.

2. The fabric structure with a radiative cooling coating according to claim 1, characterized in that: The thickness of the micron ball layer is 0.15 μm, and the thickness of the composite material layer is 0.1 μm.

3. The fabric structure with a radiative cooling coating according to claim 1, characterized in that: The component usage ratio of the microsphere layer is white PU glue: microsphere = 1:0.

02.

4. The fabric structure with a radiative cooling coating according to claim 1, characterized in that: The particle size of the microspheres is 10 to 16 μm.

5. The fabric structure with a radiative cooling coating according to claim 4, characterized in that: The particle size of the microspheres is 12 μm.

6. The fabric structure with a radiative cooling coating according to claim 1, characterized in that: The component usage ratio of the composite material layer is transparent PU glue: ATO antimony tin oxide powder: phase change material powder = 1:0.05:0.

05.

7. The fabric structure with a radiative cooling coating according to claim 1, characterized in that: The particle size of the ATO antimony tin oxide powder is 20 to 500 nanometers.

8. The fabric structure with a radiative cooling coating according to claim 1, characterized in that: The components in the phase change material powder are as follows in percentage by mass: 19.0-27.2% of polyformal melamine, 5.8-7.2% of styrene-maleic anhydride, and 66.0-72.0% of n-hexadecane.

9. The fabric structure with a radiative cooling coating according to claim 1, characterized in that: The white PU glue and the transparent PU glue are both water-based PU glue.

10. A method for preparing a fabric structure having a radiative cooling coating according to any one of claims 1 to 9, characterized in that: The method steps are as follows: Step 1: Transparent PU glue, ATO antimony tin oxide powder, and phase change material powder are stirred for 0.5-1 hour using at least one of an ultrasonic oscillator and a blender to obtain a uniformly dispersed composite coating; the composite coating is applied to a transfer film by coating or screen printing, and then baked in a drying oven at 60-80° C. for 1-2 minutes to form a composite material layer, which is then removed and cooled to room temperature; Step 2: Stirring the white PU glue and the microspheres for 0.5-1 hour using at least one of an ultrasonic oscillator and a blender to obtain a uniformly dispersed microsphere coating; applying the microsphere coating to the composite material layer of the transfer film by coating or screen printing, and then baking in a drying oven at 120-150° C. for 5-10 minutes to form a microsphere layer; Step 3: Use a heat press machine to emboss the fabric and transfer film, and emboss both sides for 10 to 15 seconds.

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