Fabric with radiation cooling / heat insulation and self-cleaning functions and preparation method thereof

Abstract

The present application discloses a fabric with radiation cooling / heat insulation and self-cleaning functions and a preparation method thereof, comprising the following steps: washing the fabric with deionized water and acetone and drying it; adding PDMS and nano-cesium tungsten bronze powder together into a deionized water or ethanol solution and placing it under an emulsifier for high-speed stirring to prepare a finishing agent; impregnating the fabric into the finishing agent, finishing it through a two-immersion and two-rolling process and drying it to prepare a co-impregnated fabric of PDMS and nano-cesium tungsten bronze powder; placing the co-impregnated fabric in a plasma discharge device for plasma-induced crosslinking treatment to prepare a fabric with radiation cooling / heat insulation and self-cleaning functions. The fabric prepared in the present application has a solar cooling effect with synergistic enhancement of radiation cooling / heat insulation, and has a series of properties such as anti-fouling self-cleaning function, UV resistance, and aging resistance. It can achieve low-cost, wide-width mass production and has very broad application prospects in the fields of clothing and industrial textiles.

Description

Technical Field

[0001] The present application belongs to the technical field of clothing and industrial textiles, and specifically relates to a fabric with radiant cooling / heat insulation and self-cleaning functions and a preparation method thereof. Background Art

[0002] Considering the outdoor use of radiative cooling textiles, especially the outdoor use demand in hot summer, in addition to radiative cooling materials, it is often necessary to add some nanomaterials that reflect sunlight, such as aluminum oxide (Al2O3), zinc oxide (ZnO), titanium dioxide (TiO2), silicon dioxide (SiO2) nanoparticles, etc. At present, the radiative cooling films or fabrics prepared by using more radiative cooling materials such as polyvinylidene fluoride (PVDF) in combination with the above-mentioned sunlight-reflecting nanomaterials have the disadvantage of being single in color (mostly white), such as CN 114736566 A which discloses a super-hydrophobic self-cleaning temperature-adaptive radiative cooling coating and a coating preparation method. Although the color diversity of radiative cooling fabrics can be given by adding technical means such as photonic crystals, solid-state dyes, and color-changing microcapsules, there are disadvantages such as high cost and reduced radiative cooling performance. Summary of the Invention

[0003] The present application provides a fabric with radiant cooling / heat insulation and self-cleaning functions and a preparation method thereof to solve the above-mentioned technical problems.

[0004] In order to solve the above technical problems, a technical solution adopted in this application is: a fabric with radiation cooling / heat insulation and self-cleaning functions, the surface of the functional fabric is provided with a radiation coating, and the radiation coating includes polydimethylsiloxane and nano-cesium tungsten bronze.

[0005] Furthermore, the mass ratio of polydimethylsiloxane to nano-cesium tungsten bronze is 1-50:0.1-2.

[0006] Furthermore, the thickness of the radiation coating is 0.15 to 0.5 mm.

[0007] Another technical solution adopted in this application is: a method for preparing a fabric with radiant cooling / heat insulation and self-cleaning functions, comprising the following steps:

[0008] Wash the fabric with deionized water and acetone and dry to remove oils and other impurities;

[0009] Polydimethylsiloxane (PDMS) and nano-cesium tungsten bronze powder are added together into deionized water or ethanol solution and placed in an emulsifier for high-speed stirring to prepare a finishing agent with radiation cooling / heat insulation and self-cleaning functions;

[0010] The fabric was immersed in the finishing agent and ultrasonically treated for 10 minutes, finished by a two-dipping and two-padding process, and then dried at a temperature of 60°C to prepare a co-impregnated fabric of polydimethylsiloxane and nano-cesium tungsten bronze powder;

[0011] The co-impregnated fabric was placed in a plasma discharge device for plasma-induced crosslinking, producing a fabric with radiative cooling / thermal insulation and self-cleaning properties. The plasma treatment parameters were: 100W power, 220Pa discharge voltage, 60-90s treatment time, and argon as the working gas.

[0012] Furthermore, the mass concentration of dimethylsiloxane is 1 g / L to 50 g / L.

[0013] Furthermore, the addition amount of nano-cesium tungsten bronze powder is 0.1 g / L to 2 g / L.

[0014] Furthermore, the liquid rolling rate in the two-dipping and two-rolling process is controlled at 50% to 70%.

[0015] Furthermore, the fabric is a natural fiber fabric or a synthetic fiber fabric.

[0016] Furthermore, the natural fiber fabric is one or more of cotton, linen, silk and wool.

[0017] Furthermore, the synthetic fiber fabric is one or more of polypropylene, polyester, nylon, viscose, acrylic, polyethylene, chloroprene, and spandex.

[0018] The beneficial effects of the present application are as follows: the PDMS and nano-cesium tungsten bronze powder used in the present invention are both highly transparent materials for visible light, and the finished fabric can maintain its original color, thereby achieving color diversity of the radiation cooling fabric, and low cost, without reducing the radiation cooling performance; the nano-cesium tungsten bronze powder in the present application has excellent near-infrared light absorption performance, and can actively isolate near-infrared light, which accounts for a relatively high proportion of thermal energy in sunlight, thereby achieving the effect of synergistic cooling by radiation cooling / thermal insulation cooling, and further improving the cooling and refrigeration performance of the fabric; PDMS is a super-hydrophobic self-cleaning coating, which can avoid the problem of reduced radiation cooling performance caused by dust deposition on the surface of the cooling fabric. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to specific embodiments.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] This application provides a fabric with radiative cooling / thermal insulation and self-cleaning functions. The surface of the functional fabric is provided with a radiative coating comprising polydimethylsiloxane and nano-cesium tungsten bronze. The mass ratio of polydimethylsiloxane to nano-cesium tungsten bronze is 1-50:0.1-2. The thickness of the radiative coating is 0.15-0.5 mm.

[0022] The preparation method of the above fabric comprises the following steps:

[0023] Step S1. Washing the fabric with deionized water and acetone and drying it to remove oil and other impurities;

[0024] Step S2. PDMS and nano-cesium tungsten bronze powder are added to a deionized water or ethanol solution and stirred at high speed in an emulsifier to prepare a finishing agent with radiative cooling / insulating and self-cleaning functions, wherein the PDMS mass concentration is 1 g / L to 50 g / L and the amount of nano-cesium tungsten bronze powder added is 0.1 g / L to 2 g / L;

[0025] Step S3. The fabric of step S1 is immersed in the finishing agent of step S2 and ultrasonically treated for 10 minutes. After finishing by two dipping and two padding processes and drying, a PDMS and nano-cesium tungsten bronze powder co-impregnated fabric is prepared, wherein the padding rate is controlled at 50% to 70% and the drying temperature is 60°C.

[0026] Step S4: Placing the fabric from step S3 in a plasma discharge device for plasma-induced crosslinking to produce a fabric with radiative cooling / thermal insulation and self-cleaning properties. Plasma treatment parameters are: power 100 W, discharge voltage 220 Pa, treatment time 60-90 seconds, and argon as the working gas.

[0027] The fabric is a natural fiber fabric or a synthetic fiber fabric. The natural fiber fabric is one or more of cotton, linen, silk, and wool. The synthetic fiber fabric is one or more of polypropylene, polyester, nylon, viscose, acrylic, polyethylene, chloroprene, and spandex.

[0028] Example 1

[0029] This embodiment provides a fabric with radiant cooling / heat insulation and self-cleaning functions, and the preparation method thereof comprises the following steps:

[0030] Step S1. Wash the cotton fabric with deionized water and acetone and dry it to remove oil and other impurities;

[0031] Step S2. PDMS and nano-cesium tungsten bronze powder are added to a deionized water or ethanol solution and stirred at high speed in an emulsifier to prepare a finishing agent with radiative cooling / insulating and self-cleaning functions, wherein the PDMS mass concentration is 1 g / L and the nano-cesium tungsten bronze powder addition amount is 0.1 g / L;

[0032] Step S3. The fabric of step S1 is immersed in the finishing agent of step S2 and ultrasonically treated for 10 minutes. After finishing by two dipping and two padding processes and drying, a PDMS and nano-cesium tungsten bronze powder co-impregnated fabric is prepared, wherein the padding rate is controlled at 50% and the drying temperature is 60°C.

[0033] Step S4: Placing the fabric from step S3 in a plasma discharge device for plasma-induced crosslinking to produce a fabric with radiative cooling / thermal insulation and self-cleaning properties. The plasma treatment parameters are: power 100 W, discharge voltage 220 Pa, treatment time 60 s, and argon as the working gas.

[0034] Example 2

[0035] This embodiment provides a fabric with radiant cooling / heat insulation and self-cleaning functions, and the preparation method thereof comprises the following steps:

[0036] Step S1. Washing the polyester fabric with deionized water and acetone and drying it to remove oil and other impurities;

[0037] Step S2. PDMS and nano-cesium tungsten bronze powder are added to a deionized water or ethanol solution and stirred at high speed in an emulsifier to prepare a finishing agent with radiative cooling / insulating and self-cleaning functions, wherein the PDMS mass concentration is 10 g / L and the nano-cesium tungsten bronze powder addition amount is 0.5 g / L;

[0038] Step S3. The fabric of step S1 is immersed in the finishing agent of step S2 and ultrasonically treated for 10 minutes. After finishing by two dipping and two padding processes and drying, a PDMS and nano-cesium tungsten bronze powder co-impregnated fabric is prepared, wherein the padding rate is controlled at 60% and the drying temperature is 60°C.

[0039] Step S4: Placing the fabric from step S3 in a plasma discharge device for plasma-induced crosslinking to produce a fabric with radiative cooling / thermal insulation and self-cleaning properties. Plasma treatment parameters are: power 100 W, discharge voltage 220 Pa, treatment time 70 s, and argon as the working gas.

[0040] Example 3

[0041] This embodiment provides a fabric with radiant cooling / heat insulation and self-cleaning functions, and the preparation method thereof comprises the following steps:

[0042] Step S1. Wash the nylon fabric with deionized water and acetone and dry it to remove oil and other impurities;

[0043] Step S2. PDMS and nano-cesium tungsten bronze powder are added to a deionized water or ethanol solution and stirred at high speed in an emulsifier to prepare a finishing agent with radiative cooling / insulating and self-cleaning functions, wherein the PDMS mass concentration is 20 g / L and the nano-cesium tungsten bronze powder addition amount is 1 g / L;

[0044] Step S3. The fabric of step S1 is immersed in the finishing agent of step S2 and ultrasonically treated for 10 minutes. After finishing by two dipping and two padding processes and drying, a PDMS and nano-cesium tungsten bronze powder co-impregnated fabric is prepared, wherein the padding rate is controlled at 65% and the drying temperature is 60°C.

[0045] Step S4: Placing the fabric from step S3 in a plasma discharge device for plasma-induced crosslinking to produce a fabric with radiative cooling / thermal insulation and self-cleaning properties. Plasma treatment parameters are: power 100 W, discharge voltage 220 Pa, treatment time 80 s, and argon as the working gas.

[0046] Example 4

[0047] This embodiment provides a fabric with radiant cooling / heat insulation and self-cleaning functions, and the preparation method thereof comprises the following steps:

[0048] Step S1. Wash the spandex fabric with deionized water and acetone and dry it to remove oil and other impurities;

[0049] Step S2. PDMS and nano-cesium tungsten bronze powder are added to a deionized water or ethanol solution and stirred at high speed in an emulsifier to prepare a finishing agent with radiative cooling / insulating and self-cleaning functions, wherein the PDMS mass concentration is 50 g / L and the nano-cesium tungsten bronze powder addition amount is 2 g / L;

[0050] Step S3. The fabric of step S1 is immersed in the finishing agent of step S2 and ultrasonically treated for 10 minutes. After finishing by two dipping and two padding processes and drying, a PDMS and nano-cesium tungsten bronze powder co-impregnated fabric is prepared, wherein the padding rate is controlled at 70% and the drying temperature is 60°C.

[0051] Step S4: Placing the fabric from step S3 in a plasma discharge device for plasma-induced crosslinking to produce a fabric with radiative cooling / thermal insulation and self-cleaning properties. Plasma treatment parameters are: power 100 W, discharge voltage 220 Pa, treatment time 90 s, and argon as the working gas.

[0052] Example 5

[0053] This embodiment provides a fabric with radiant cooling / heat insulation and self-cleaning functions, and the preparation method thereof comprises the following steps:

[0054] Step S1. Wash the acrylic fabric with deionized water and acetone and dry it to remove oil and other impurities;

[0055] Step S2. PDMS and nano-cesium tungsten bronze powder are added to a deionized water or ethanol solution and stirred at high speed in an emulsifier to prepare a finishing agent with radiative cooling / insulating and self-cleaning functions, wherein the PDMS mass concentration is 45 g / L and the nano-cesium tungsten bronze powder addition amount is 1.5 g / L;

[0056] Step S3. The fabric of step S1 is immersed in the finishing agent of step S2 and ultrasonically treated for 10 minutes. After finishing by two dipping and two padding processes and drying, a PDMS and nano-cesium tungsten bronze powder co-impregnated fabric is prepared, wherein the padding rate is controlled at 55% and the drying temperature is 60°C.

[0057] Step S4: Placing the fabric from step S3 in a plasma discharge device for plasma-induced crosslinking to produce a fabric with radiative cooling / thermal insulation and self-cleaning properties. Plasma treatment parameters are: power 100 W, discharge voltage 220 Pa, treatment time 85 s, and argon as the working gas.

[0058] Test Case

[0059] The cooling performance of ordinary cotton fabric and the radiant cooling / heat insulation and self-cleaning functional fabrics prepared in Examples 1 to 5 under direct sunlight was tested as follows:

[0060] Cooling test: Since there is no reference test standard for radiant cooling technology, we refer to the test environment in most literature and select a sunny summer day from 9 am to 3 pm, with an average temperature of 35°C, an average humidity of 65%, and a wind speed of 1-2. The test results are shown in Table 1.

[0061] Table 1 Comparison of cooling of fabrics in various embodiments and traditional cotton fabrics

[0062]

[0063] As can be seen from Table 1, the radiant cooling / heat insulation and self-cleaning functional fabrics prepared in Examples 1 to 5 of the present application have a relatively obvious cooling performance when exposed to strong summer sunlight. Compared with ordinary cotton fabrics, the average surface temperature of the fabric drops by 4 to 8°C, and the average temperature of the objects covered by the fabric drops by 4 to 9°C.

[0064] Self-cleaning performance test: The self-cleaning performance of a fabric is related to its hydrophilic and hydrophobic properties. The static contact angle and dynamic rolling angle of water droplets of the radiant cooling / heat-insulating and self-cleaning functional fabrics prepared in Examples 1 to 5 were tested. The test results are shown in Table 2.

[0065] Table 2 Tests on static contact angle and dynamic rolling angle of water droplets on fabrics in various embodiments

[0066] Test conditions Example 1 Example 2 Example 3 Example 4 Example 5 contact angle 152.5° 151.8° 153.3° 153.2° 152.7° Roll angle 5.2° 5.7° 5.1° 5.1° 5.2°

[0067] As can be seen from Table 2, the static contact angle of water droplets of the radiant cooling / thermal insulation and self-cleaning functional fabrics prepared in Examples 1 to 5 of the present application is greater than 150°, and the dynamic rolling angle of water droplets is within 6°, indicating that the radiant cooling / thermal insulation and self-cleaning functional fabrics prepared in the present application are all superhydrophobic fabrics with excellent self-cleaning function, and the PDMS material itself has good weather resistance such as UV resistance and aging resistance. Therefore, this functional fabric meets the needs of long-term outdoor cooling use.

[0068] The fabric prepared in the present application has a solar cooling effect with synergistic enhancement of radiation cooling / thermal insulation, and has a series of properties such as stain resistance and self-cleaning function, UV resistance, and aging resistance. It can be mass-produced at low cost and with wide width, and has very broad application prospects in the fields of clothing (such as sun protection clothing, outdoor work clothes, sun hats, etc.) and industrial textiles (such as tent cloth, tarpaulin, construction cloth, car covers, etc.).

[0069] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for preparing a fabric with radiant cooling / heat insulation and self-cleaning functions, characterized in that: The following steps are involved: Wash the fabric with deionized water and acetone and dry to remove oils and other impurities; Adding polydimethylsiloxane and nano-cesium tungsten bronze powder together into deionized water or ethanol solution and stirring at high speed under an emulsifier to prepare a finishing agent with radiation cooling / heat insulation and self-cleaning functions; The fabric was immersed in the finishing agent and ultrasonically treated for 10 minutes, and then finished by a two-dipping and two-padding process and dried at a temperature of 60° C. to prepare a fabric co-impregnated with polydimethylsiloxane and nano-cesium tungsten bronze powder; The co-impregnated fabric is placed in a plasma discharge device for plasma-induced crosslinking treatment to prepare a fabric with radiation cooling / thermal insulation and self-cleaning functions; the plasma treatment process parameters are: power 100W, discharge voltage 220Pa, treatment time 60-90s, and working gas argon.

2. The method according to claim 1, characterized in that The mass concentration of the dimethylsiloxane is 1 g / L to 50 g / L.

3. The method according to claim 1, characterized in that The addition amount of the nano-cesium tungsten bronze powder is 0.1 g / L to 2 g / L.

4. The method according to claim 1, wherein The liquid pressing rate in the two-dipping and two-pressing process is controlled at 50% to 70%.

5. The method according to claim 1, wherein The fabric is a natural fiber fabric or a synthetic fiber fabric.

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