CN115365097A - Colored passive radiation refrigeration fabric and preparation method thereof - Google Patents

Colored passive radiation refrigeration fabric and preparation method thereof Download PDF

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Publication number
CN115365097A
CN115365097A CN202210969496.8A CN202210969496A CN115365097A CN 115365097 A CN115365097 A CN 115365097A CN 202210969496 A CN202210969496 A CN 202210969496A CN 115365097 A CN115365097 A CN 115365097A
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fabric
organic pigment
colored
coating
passive radiation
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CN115365097B (en
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易玲敏
徐帅
张佳文
蔡英
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Zhejiang Sci Tech University ZSTU
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Zhejiang Sci Tech University ZSTU
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/061—Special surface effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/061—Special surface effect
    • B05D5/063—Reflective effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/546—No clear coat specified each layer being cured, at least partially, separately
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The invention discloses a colored passive radiation refrigerating fabric, which comprises a fiber fabric, a passive radiation cooling coating and an organic pigment coating, wherein the passive radiation cooling coating and the organic pigment coating are sequentially coated on the surface of the fiber fabric; the passive radiation cooling coating is an inorganic particle coating; the inorganic particle coating has high reflectivity to visible-near infrared sunlight and high radiance at an atmospheric window of 8-13 μm. The invention also discloses a preparation method of the colored passive radiation refrigeration fabric. The colored passive radiation refrigeration fabric is obtained by compositely assembling a plurality of layers of functional coatings, so that the common fiber fabric has excellent spectrum selection characteristics of visible-near infrared visible light high reflection and mid-infrared atmospheric window (8-13 mu m) strong radiation, and further can realize high-efficiency radiation refrigeration under solar illumination. Meanwhile, the outermost colored coating layer enables the fiber fabric to have a color effect, and the application range is wider.

Description

Colored passive radiation refrigeration fabric and preparation method thereof
Technical Field
The invention relates to the technical field of passive radiation refrigeration materials, in particular to a colored passive radiation refrigeration fabric and a preparation method thereof.
Background
As the global climate warms, cities have an increasing demand for refrigeration, and generally, summer temperatures above 37 ℃ are common for most cities in equatorial and subtropical regions. Studies have shown that by 2030, the annual cost of climate problems caused by high temperatures will reach $ 2.4 trillion. In order to reduce energy consumption and harm caused by strong solar radiation in summer, daytime radiation cooling is a passive radiation refrigeration mode without energy consumption.
The daytime passive radiation refrigeration utilizes the high reflectivity of the material to sunlight and the high emissivity of the medium infrared in an atmospheric window (8-13 mu m), and can transmit heat to the outer space from the atmospheric window in a radiation mode, thereby achieving the effect of cooling without any energy input. The widespread use of such materials is expected to significantly reduce the use of equipment having a refrigeration effect such as an air conditioner, thereby effectively reducing the energy consumption.
However, from the prior published reports, the radiation refrigeration performance of many radiation refrigeration materials has not met the practical requirements under the condition of sunlight in the daytime, more importantly, the examples of the passive radiation refrigeration used for fabric in the colored daytime are still limited, and the research is mainly focused on the following aspects:
1) The multilayer structure is achieved by combining a colored inorganic pigmented coating layer, which provides color, with a polymer layer that enhances reflectivity and emissivity by adjusting the microstructure, such as by introducing multi-sized pores in the polymer layer. The inorganic pigment coating with the structure can absorb light in a visible light wave band to generate radiation energy, and can also absorb part of the radiation energy in an infrared wave band to reduce the integral cooling power.
2) The structural color is utilized, and the color is generated through the interaction (scattering, interference, diffraction and the like) of the constructed special structure and natural light, although the structural color can avoid absorbing light to generate radiation energy, compared with the color generated by the pigment, the structural color is extremely light, the saturation is far less, and the practical application of the structural color is limited.
Chinese patent publication No. CN113388305A discloses a radiation refrigeration composite coating with structural color, which is prepared by introducing TiO into PMMA resin 2 As highly reflective particles, tiO 2 The @ Ag nano shell core structure particles or pure Ag nano particles are used as color forming particles to prepare the radiation refrigeration composite coating with structural color. High reflectivity of the coating to sunlight is made of TiO 2 The particles are used for ensuring the structural color serving as color support, the local plasma resonance of the color-forming nano particles is used for ensuring the structural color, and the reflectivity of the whole composite coating to sunlight can reach 85.33% -86.33%. However, the overall color of the structural color source is weak and the use of Ag greatly increases the cost.
Chinese patent publication No. CN113136724A discloses a radiation refrigeration fabric, in which alumina particles with high refractive index are introduced to adhere to fibers, so as to improve the reflectivity of the whole material, and reduce the temperature by 12 ℃ compared with cotton fabric, which is a very considerable cooling effect, but the shedding of particles needs to be considered, and the color is monotonous and only white, and cannot meet the rich color requirement.
In addition, although these radiation refrigeration materials have a certain cooling effect, the influence of the actual environment on the cooling effect of the materials, such as the influence of raindrops and dust on the reflectivity and the mid-infrared emissivity of the materials, is not considered.
Disclosure of Invention
The invention provides a colored passive radiation refrigerating fabric and a preparation method thereof, solves the problems of poor cooling performance, complex preparation method, high cost and the like in the prior art, and realizes industrial application of the colored passive radiation refrigerating fabric.
The specific technical scheme of the invention is as follows:
a colored passive radiation refrigeration fabric comprises a fiber fabric, a passive radiation cooling coating and an organic pigment coating, wherein the passive radiation cooling coating and the organic pigment coating are sequentially coated on the surface of the fiber fabric; the passive radiation cooling coating is an inorganic nanoparticle coating modified by a silane coupling agent, and the inorganic nanoparticle coating has high reflectivity to visible light-near infrared sunlight and high radiance at an atmospheric window of 8-13 mu m.
According to the invention, the inorganic nanoparticles are modified and then sprayed on the fabric, the modified inorganic particles are more tightly combined with the fabric and are not easy to fall off, and then the organic pigment particles with certain reflection performance are sprayed to provide colors, so that the fabric with a color radiation cooling effect is obtained.
The inorganic nano particles are one or more of silicon dioxide, zinc oxide, titanium dioxide and aluminum oxide; the particle diameter of the inorganic nano particles is 200-1500 nm.
The silane coupling agent is one or more of gamma-methacryloxypropyl trimethoxy silane (KH 570), gamma-glycidoxypropyltrimethoxy silane (KH 560), gamma-aminopropyltriethoxysilane (KH 550), N-beta- (aminoethyl) -gamma-aminopropyl methyl dimethoxysilane (KH 602) and N- (beta-aminoethyl) -gamma-aminopropyltrimethoxy silane (KH 792).
The alkoxy in the molecules of the silane coupling agents can be hydrolyzed to react with inorganic materials to form a strong chemical bond, and epoxy and amino groups have the property of being organophilic and can interact with long molecular chains in organic matters to generate chemical reaction or physical winding, so that the compatibility between the inorganic matters and organic macromolecules is improved, and the two substances with larger property difference are firmly combined to play a role of a molecular bridge. The invention utilizes the silane coupling agent to improve the interfacial adhesion between the inorganic substance and the fabric.
In the modification process, the amount of the silane coupling agent has great influence on the success of the modification. When the using amount of the silane coupling agent is smaller, the silane coupling agent reacts with hydroxyl on the surface of the silicon dioxide, so that the hydroxyl on the surface of the silicon dioxide is reduced, and the oleophilic degree of the silicon dioxide is increased; however, when the amount of the silane coupling agent is too large, siloxane anions generated by hydrolysis of the silane coupling agent attack Si atoms in the silane coupling agent molecules bonded to silica, and bridge the particles, thereby causing flocculation of the powder. Therefore, the silane coupling agent is preferably contained in an amount of 0.5 to 5% by mass based on the mass of the inorganic nanoparticles.
More preferably, the silane coupling agent is contained in an amount of 0.5 to 2% by mass based on the mass of the inorganic nanoparticles.
Preferably, the color organic pigment is organic pigment phthalocyanine blue BGS, F3RK permanent red or 1138 benzidine yellow.
Preferably, the organic pigment coating is obtained by spraying organic pigment dispersion liquid and drying; the solvent of the organic pigment dispersion liquid is aqueous solution of polyvinyl alcohol.
The polyvinyl alcohol added into the organic pigment dispersion liquid can form a film to fix organic pigment particles, so that the adhesion fastness of the organic pigment is ensured.
The fabric can be cotton fabric, polyester fabric, spandex fabric, acrylic fabric and the like.
Inorganic nanoparticles with different mass fractions are added into the inorganic nanoparticle dispersion liquid of the passive radiation coating, and the coating amount of the finally prepared radiation refrigeration fabric is different under the condition of the same fabric treatment, so that the passive radiation refrigeration effect is influenced.
The organic pigment particles can reduce the reflectivity of visible light wave bands and improve the reflectivity of near infrared wave bands, and in general, part of refrigeration performance can be sacrificed under the condition of introducing colors; polyvinyl alcohol added into the colored pigment dispersion liquid forms a polymer film after being dried, so that pigment particles can be fixed, and the middle infrared radiation performance can be improved.
Preferably, the inorganic particle suspension is sprayed on the unit area of the fabric in an amount of 0.2 to 0.8g/cm 2 The spraying amount of the organic pigment suspension is 0.02-0.03 g/cm 2 。
The invention also provides a preparation method of the colored passive radiation refrigerating fabric, which comprises the following steps:
(1) Dispersing inorganic nanoparticles in absolute ethyl alcohol to obtain inorganic nanoparticle dispersion liquid;
(2) Adding a silane coupling agent into the inorganic nanoparticle dispersion liquid, adding a solvent, stirring for 2-3 h at 80-100 ℃, and modifying the inorganic nanoparticles to obtain a modified inorganic nanoparticle dispersion liquid;
(3) Dispersing a color organic pigment in water containing a dispersing agent and polyvinyl alcohol to obtain an organic pigment dispersion liquid;
(4) And spraying the modified inorganic nano particle dispersion liquid on the fabric by using a spray gun, drying, spraying the organic pigment dispersion liquid, and drying to obtain the colored passive radiation cooling refrigeration fabric.
In the inorganic particle dispersion, the mass fraction of the modified inorganic nanoparticles is 5%.
In the step (2), the solvent is deionized water.
In the step (3), the dispersing agent and polyvinyl alcohol are added into water, and after ultrasonic dispersion, the colored organic pigment is added, and ball milling is carried out, so as to obtain the organic pigment dispersion liquid.
In the step (3), the mass ratio of the dispersing agent to the color organic pigment is 1:1 to 5; the polyvinyl alcohol is added in an amount of 2 to 10% based on the mass of water.
Compared with the prior art, the invention has the beneficial effects that:
the colored passive radiation refrigeration fabric provided by the invention is obtained by compositely assembling a plurality of layers of functional coatings, so that a common fiber fabric has excellent visible-near infrared visible light high reflection and spectrum selection characteristics of infrared strong radiation in an atmospheric window (8-13 mu m), and further can realize efficient radiation refrigeration under solar illumination. Meanwhile, the outermost organic pigment coating layer enables the fiber fabric to have richer color display and has the potential of being applied to wider fields.
The fabric with the radiation refrigeration function, which is prepared by the invention, can realize the radiation cooling effect on the premise of ensuring the color, and has the advantages of simple operation and wider application range.
Drawings
FIG. 1 is a graph of the visible-near infrared reflectance spectrum of a colored passive radiation refrigeration fabric of example 2;
FIG. 2 is an SEM image of a colored passive radiation refrigeration coating of example 2;
fig. 3 is a graph comparing the cooling of the colored passive radiation cooling fabric of example 2 by a simulation apparatus.
Detailed Description
In the following examples, the modified inorganic particles used were prepared using the following preparation process:
according to the stoichiometric ratio of 1: and 19, accurately weighing a certain amount of raw materials such as silicon dioxide particles, ethanol and the like, mixing, ultrasonically dispersing for 25min by using a cell crusher, then dropwise adding 1% of silane coupling agent, additionally dropwise adding 0.5% of deionized water, stirring in an oil bath kettle at the temperature of 90 ℃, reacting for 2-3 h, and finally obtaining the modified inorganic nanoparticle suspension. The particle size of the inorganic nano particles is 200-1500 nm.
Example 1
A colored refrigeration fabric is prepared by the following steps:
1) Mixing 1 part of silicon dioxide particles into 19 parts of ethanol, performing ultrasonic dispersion for 25min, then adding 0.01 part of KH570, additionally dropwise adding 0.005 part of water, and modifying at 90 ℃ for 2-3 h to obtain the modified inorganic particle suspension.
2) Adding a certain amount of organic pigment particles into deionized water containing a dispersing agent and polyvinyl alcohol, performing ultrasonic dispersion for 20min, and stirring at 40 ℃ for 2-3 h to obtain an organic pigment aqueous solution. In the organic pigment aqueous solution, the concentration of the organic pigment is 0.1-0.2%, and the mass of the polyvinyl alcohol is 2-10% of the mass of water.
3) And (3) taking a piece of cotton fabric, spraying the inorganic particle suspension liquid obtained in the step (1) on the fabric for 2-3 times by using a spray gun, drying, spraying the organic pigment suspension liquid obtained in the step (2) on the fabric for 1-2 times, and drying.
The spraying amount of the inorganic particle suspension on the unit area of the fabric is 0.2 to 0.8g/cm 2 The spraying amount of the organic pigment suspension is 0.02-0.03 g/cm 2 。
Example 2
A colored refrigeration fabric is prepared by the following steps:
1) Mixing 1 part of silicon dioxide particles into 19 parts of ethanol, performing ultrasonic dispersion for 25min, then adding 0.01 part of KH550, additionally dropwise adding 0.005 part of water, and modifying at 90 ℃ for 2-3 h to obtain the modified inorganic particle suspension.
2) Adding a certain amount of organic pigment particles into deionized water containing a dispersing agent and polyvinyl alcohol, performing ultrasonic dispersion for 20min, and stirring at 40 ℃ for 2-3 h to obtain an organic pigment aqueous solution. In the organic pigment aqueous solution, the concentration of the organic pigment is 0.1-0.2%, and the mass of the polyvinyl alcohol is 2-10% of the mass of water.
3) Taking a piece of cotton fabric, spraying the inorganic particle suspension liquid obtained in the step (1) on the fabric for 2-3 times by using a spray gun, drying, spraying the organic pigment suspension liquid obtained in the step (2) on the fabric for 1-2 times, and drying.
The spraying amount of the inorganic particle suspension on the unit area of the fabric is 0.2 to 0.8g/cm 2 The spraying amount of the organic pigment suspension is 0.02-0.03 g/cm 2 。
FIG. 1 is a visible-near infrared reflection spectrum of a colored passive radiation refrigeration fabric in example 2, wherein the colored fabric absorbs a specific wavelength in a visible light band to present a colored appearance, and still has a low reflectivity in a near infrared band to ensure a good radiation cooling effect;
FIG. 2 is an SEM image of a colored passive radiation refrigeration coating of example 2, and in FIG. 2, it can be seen that spherical inorganic particles are distributed on the fabric and pigment particles are distributed on a part of the inorganic microsphere particles;
fig. 3 is a temperature reduction comparison curve of the colored passive radiation refrigerating fabric under a simulated light source, and it can be seen from fig. 3 that the colored passive radiation refrigerating fabric has an excellent temperature reduction effect.
Example 3
A colored refrigeration fabric is prepared by the following steps:
1) Mixing 1 part of silicon dioxide particles into 19 parts of ethanol, performing ultrasonic dispersion for 25min, then adding 0.01 part of KH560, additionally dropwise adding 0.005 part of water, and modifying at 90 ℃ for 2-3 h to obtain a modified inorganic particle suspension.
2) Adding a certain amount of organic pigment particles into deionized water containing a dispersing agent and polyvinyl alcohol, performing ultrasonic dispersion for 20min, and stirring at 40 ℃ for 2-3 h to obtain an organic pigment aqueous solution. In the organic pigment aqueous solution, the concentration of the organic pigment is 0.1-0.2%, and the mass of the polyvinyl alcohol is 2-10% of the mass of water.
3) And (3) taking a piece of cotton fabric, spraying the inorganic particle suspension liquid obtained in the step (1) on the fabric for 2-3 times by using a spray gun, drying, spraying the organic pigment suspension liquid obtained in the step (2) on the fabric for 1-2 times, and drying.
Example 4
A colored refrigeration fabric is prepared by the following steps:
1) Mixing 1 part of silicon dioxide particles into 19 parts of ethanol, performing ultrasonic dispersion for 25min, then adding 0.01 part of KH602, additionally dropwise adding 0.005 part of water, and modifying at 90 ℃ for 2-3 h to obtain the modified inorganic particle suspension.
2) Adding a certain amount of organic pigment particles into deionized water containing a dispersing agent and polyvinyl alcohol, performing ultrasonic dispersion for 20min, and stirring at 40 ℃ for 2-3 h to obtain an organic pigment aqueous solution. In the organic pigment aqueous solution, the concentration of the organic pigment is 0.1-0.2%, and the mass of the polyvinyl alcohol is 2-10% of the mass of water.
3) And (3) taking a piece of cotton fabric, spraying the inorganic particle suspension liquid obtained in the step (1) on the fabric for 2-3 times by using a spray gun, drying, spraying the organic pigment suspension liquid obtained in the step (2) on the fabric for 1-2 times, and drying.
Example 5
A colored refrigeration fabric is prepared by the following steps:
1) Mixing 1 part of silicon dioxide particles into 19 parts of ethanol, performing ultrasonic dispersion for 25min, then adding 0.01 part of KH792, additionally dropwise adding 0.005 part of water, and modifying at 90 ℃ for 2-3 h to obtain the modified inorganic particle suspension.
2) Adding a certain amount of organic pigment particles into deionized water containing a dispersing agent and polyvinyl alcohol, performing ultrasonic dispersion for 20min, and stirring at 40 ℃ for 2-3 h to obtain an organic pigment aqueous solution. In the organic pigment aqueous solution, the concentration of the organic pigment is 0.1-0.2%, and the mass of the polyvinyl alcohol is 2-10% of the mass of water.
3) And (3) taking a piece of cotton fabric, spraying the inorganic particle suspension liquid obtained in the step (1) on the fabric for 2-3 times by using a spray gun, drying, spraying the organic pigment suspension liquid obtained in the step (2) on the fabric for 1-2 times, and drying.
Example 6
A colored refrigeration fabric is prepared by the following steps:
1) Mixing 1 part of silicon dioxide particles into 19 parts of ethanol, performing ultrasonic dispersion for 25min, then adding 0.01 part of KH570, additionally dropwise adding 0.005 part of water, and modifying at 90 ℃ for 2-3 h to obtain the modified inorganic particle suspension.
2) Adding a certain amount of organic pigment particles into deionized water containing a dispersing agent and polyvinyl alcohol, performing ultrasonic dispersion for 20min, and stirring at 40 ℃ for 2-3 h to obtain an organic pigment aqueous solution. In the organic pigment aqueous solution, the concentration of the organic pigment is 0.1-0.2%, and the mass of the polyvinyl alcohol is 2-10% of the mass of water.
3) And (3) taking a piece of polyester fabric, spraying the inorganic particle suspension liquid obtained in the step (1) on the fabric for 2-3 times by using a spray gun, drying, spraying the organic pigment suspension liquid obtained in the step (2) on the fabric for 1-2 times, and drying.
Example 7
A colored refrigeration fabric is prepared by the following steps:
1) Mixing 1 part of silicon dioxide particles into 19 parts of ethanol, performing ultrasonic dispersion for 25min, then adding 0.01 part of KH570, additionally dropwise adding 0.005 part of water, and modifying at 90 ℃ for 2-3 h to obtain the modified inorganic particle suspension.
2) Adding a certain amount of organic pigment particles into deionized water containing a dispersing agent and polyvinyl alcohol, performing ultrasonic dispersion for 20min, and stirring at 40 ℃ for 2-3 h to obtain an organic pigment aqueous solution. In the organic pigment aqueous solution, the concentration of the organic pigment is 0.1-0.2%, and the mass of the polyvinyl alcohol is 2-10% of the mass of water.
3) And (2) taking a piece of spandex fabric, spraying the inorganic particle suspension liquid obtained in the step (1) on the fabric for 2-3 times by using a spray gun, drying, spraying the organic pigment suspension liquid obtained in the step (2) on the fabric for 1-2 times, and drying.
Example 8
A colored refrigeration fabric is prepared by the following steps:
1) Mixing 1 part of silicon dioxide particles into 19 parts of ethanol, performing ultrasonic dispersion for 25min, then adding 0.01 part of KH570, additionally dropwise adding 0.005 part of water, and modifying at 90 ℃ for 2-3 h to obtain the modified inorganic particle suspension.
2) Adding a certain amount of organic pigment particles into deionized water containing a dispersing agent and polyvinyl alcohol, performing ultrasonic dispersion for 20min, and stirring at 40 ℃ for 2-3 h to obtain an organic pigment aqueous solution. In the organic pigment aqueous solution, the concentration of the organic pigment is 0.1-0.2%, and the mass of the polyvinyl alcohol is 2-10% of the mass of water.
3) And (3) taking an acrylic fabric, spraying the inorganic particle suspension obtained in the step (1) on the fabric for 2-3 times by using a spray gun, drying, spraying the organic pigment suspension obtained in the step (2) on the fabric for 1-2 times, and drying.
The fabrics prepared in examples 1, 3-8 had similar radiation cooling effects as the fabric prepared in example 2. The above-mentioned embodiments are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions, equivalents, etc. made within the scope of the principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. The colored passive radiation refrigerating fabric is characterized by comprising a fiber fabric, a passive radiation cooling coating and an organic pigment coating, wherein the passive radiation cooling coating and the organic pigment coating are sequentially coated on the surface of the fiber fabric; the passive radiation cooling coating is an inorganic nanoparticle coating modified by a silane coupling agent, and the inorganic nanoparticle coating has high reflectivity to visible light-near infrared sunlight and high radiance at an atmospheric window of 8-13 mu m.
2. The colored passive radiation cooling fabric of claim 1, wherein the inorganic nanoparticles are one or more of silica, zinc oxide, titanium dioxide, and alumina; the particle size of the inorganic nano particles is 200-1500 nm.
3. The colored passive radiant cooling fabric as claimed in claim 1, wherein the silane coupling agent is one or more of γ -methacryloxypropyltrimethoxysilane, γ -glycidoxypropyltrimethoxysilane, γ -aminopropyltriethoxysilane, N- β - (aminoethyl) - γ -aminopropylmethyldimethoxysilane, and N- (β -aminoethyl) - γ -aminopropyltrimethoxysilane.
4. The colored passive radiation refrigeration fabric according to claim 1 or 3, wherein the silane coupling agent is present in an amount of 0.5 to 5% by mass, based on the mass of the inorganic nanoparticles.
5. The colored passive radiation cooling fabric of claim 1, wherein the colored organic pigment is an organic pigment phthalo blue BGS, F3RK permanent red, or 1138 benzidine yellow.
6. The colored passive radiant cooling fabric as claimed in claim 1, wherein the organic pigment coating is obtained by spraying organic pigment dispersion and drying; the solvent of the organic pigment dispersion liquid is aqueous solution of polyvinyl alcohol.
7. The colored passive radiation cooling fabric of claim 1, wherein the inorganic particle suspension is applied in an amount of 0.2 to 0.8g/cm per unit area of the fabric 2 The spraying amount of the organic pigment suspension is 0.02-0.03 g/cm 2 。
8. A method of making a colored passive radiant cooling fabric as claimed in any one of claims 1 to 7 comprising the steps of:
(1) Dispersing inorganic nanoparticles in absolute ethyl alcohol to obtain inorganic nanoparticle dispersion liquid;
(2) Adding a silane coupling agent into the inorganic nanoparticle dispersion liquid, stirring for 2-3 h at 80-100 ℃, and modifying the inorganic nanoparticles to obtain a modified inorganic nanoparticle dispersion liquid;
(3) Dispersing a color organic pigment in water containing a dispersing agent and polyvinyl alcohol to obtain an organic pigment dispersion liquid;
(4) And spraying the modified inorganic nano particle dispersion liquid on the fabric by using a spray gun, drying, spraying the organic pigment dispersion liquid, and drying to obtain the colored passive radiation cooling refrigeration fabric.
9. The preparation method according to claim 8, wherein the mass ratio of the dispersant to the color organic pigment is 1:1 to 5.
10. The method according to claim 8, wherein the inorganic particle dispersion liquid contains modified inorganic nanoparticles in an amount of 5% by mass.
CN202210969496.8A 2022-08-12 2022-08-12 Colored passive radiation refrigeration fabric and preparation method thereof Active CN115365097B (en)

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