CN117230563A - Dual-mode radiation heat management knitted fabric and preparation method thereof - Google Patents
Dual-mode radiation heat management knitted fabric and preparation method thereof Download PDFInfo
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- CN117230563A CN117230563A CN202311207319.7A CN202311207319A CN117230563A CN 117230563 A CN117230563 A CN 117230563A CN 202311207319 A CN202311207319 A CN 202311207319A CN 117230563 A CN117230563 A CN 117230563A
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- 239000004744 fabric Substances 0.000 title claims abstract description 93
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- 238000002360 preparation method Methods 0.000 title abstract description 5
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- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
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- 229910021641 deionized water Inorganic materials 0.000 claims description 13
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- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims description 11
- 229960001149 dopamine hydrochloride Drugs 0.000 claims description 11
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- Knitting Of Fabric (AREA)
Abstract
The application relates to a dual-mode radiant heat management knitted fabric and a preparation method thereof, and relates to the field of textiles. The dual-mode radiation heat management knitted fabric is a double-sided knitted fabric formed by knitting radiation refrigeration yarns and radiation heating yarns, and two sides of the double-sided knitted fabric have radiation refrigeration effects and radiation heating effects respectively; the radiation refrigeration yarn is prepared by a spinning process, the surface of the radiation refrigeration yarn is in a porous structure, and the raw material of the radiation refrigeration yarn is a polymer with inherent infrared absorption; the radiation heating yarn is prepared by coating cotton yarn. The dual-mode radiant heat management knitted fabric is low in production cost and wider in application range, is more suitable for being applied to aspects of intelligent heat management clothing, energy-saving buildings and the like, and solves the problems that radiant heat management materials are static, single in function, high in production cost and incapable of being produced on a large scale in the prior art.
Description
Technical Field
The application relates to the technical field of textile, in particular to a dual-mode radiant heat management knitted fabric and a preparation method thereof.
Background
The rapid population growth and the intensive industrial development make the environment worse, and the requirements of people on environmental comfort are higher and higher. Conventional temperature regulation systems, such as air conditioners, consume large amounts of energy while generating excessive amounts of carbon dioxide and ozone, causing energy crisis and environmental problems. Therefore, it is highly desirable to find energy efficient and environmentally friendly thermal management strategies.
Passive daytime radiative cooling is a very attractive technique in which any object on earth can send excessive heat to the universe through an atmospheric transparent window (8-13 μm) to reduce the surface temperature of the land object with zero energy consumption. Because the process is passive and renewable, the method can be widely applied to the aspects of energy-saving building, solar battery cooling, personal heat management, wearable equipment cooling and the like. Polymer-based radiant refrigerant materials are of great interest because of their low cost and mass producibility. In particular, the porous polymer-based material, due to its high scattering efficiency of the pores and the strong thermal emissivity of the polymer matrix, further enhances the optical performance of the radiation cooler, exhibiting excellent sub-ambient cooling capacity.
The key to radiant heating is the development of photothermal materials with high solar energy absorption and heat conversion efficiency. Black coatings including carbon nanotubes, carbon black, graphene, noble metal plasmonic nanoparticles, and multilayer selective solar absorbing materials have been applied for outdoor solar heating.
However, on the one hand, existing radiant refrigeration/heating material designs are generally static and are not adapted to dynamic changes in seasons and weather. Thus, switchable dual mode radiant cooling/heating is essential for dynamic radiant heat management. On the other hand, the existing radiation refrigerating/heating material is usually prepared by an electrostatic spinning technology, has high production cost and low production efficiency, and limits the mass production and industrial application of the radiation refrigerating/heating material. Therefore, the mass production of radiation refrigerating/heating materials which can be widely applied to daily life by adopting conventional spinning technology and weaving technology remains a challenge.
Disclosure of Invention
The application aims to provide a dual-mode radiant heat management knitted fabric and a preparation method thereof, which are used for solving the problems of static radiant heat management materials, single function, high production cost and incapability of large-scale production in the prior art.
In order to achieve the above purpose, the application adopts the following technical scheme:
in a first aspect, the present application provides a dual-mode radiant heat management knitted fabric, which is a double-sided knitted fabric knitted by radiant cooling yarns and radiant heating yarns, wherein both sides of the double-sided knitted fabric have a radiant cooling effect and a radiant heating effect respectively; the radiation refrigeration yarn is prepared by a spinning process, the surface of the radiation refrigeration yarn is in a porous structure, and the raw material of the radiation refrigeration yarn is a polymer with inherent infrared absorption; the radiation heating yarn is prepared by coating cotton yarn.
In one possible implementation, the raw material of the radiation refrigeration yarn includes at least one of polyvinylidene fluoride, polydimethylsiloxane and polymethyl methacrylate.
In one possible implementation, the coating raw material for coating the cotton yarn at least comprises one of MXene, carbon nanotubes, carbon black, graphene, noble metal plasma nanoparticles and multilayer selective solar absorbing materials.
In one possible implementation, the radiation refrigerant yarn is prepared by wet spinning or melt spinning.
In a second aspect, the present application provides a method for preparing a dual mode radiant heat management knitted fabric as described in any one of the above, the method comprising the steps of:
s1, preparing radiation heating yarns:
s11, soaking cotton yarn in ethanol for a plurality of hours, washing with clear water, airing, soaking the washed and aired cotton yarn in a mixed solution containing dopamine hydrochloride and ternary buffer solution, and stirring for a plurality of hours at room temperature in a dark condition to obtain the soaked cotton yarn;
s12, washing the impregnated cotton yarn by deionized water, and then placing the cotton yarn in an oven for drying to obtain polydopamine-cotton yarn;
s13, soaking the polydopamine-cotton yarn in an MXene solution for a plurality of hours, grafting the MXene on polydopamine in the process, washing the polydopamine by deionized water, and drying the polydopamine-cotton yarn under a vacuum condition to obtain radiation heating yarn;
s2, preparing radiation refrigeration yarns:
s21, adding polyvinylidene fluoride powder into dimethylformamide solvent at normal temperature to prepare spinning solution, and stirring in a dissolving tank to form homogeneous solution;
s22, extruding the homogeneous solution through a spinneret plate, entering distilled water to be coagulated, and carrying out three-way drafting, drying and winding to obtain radiation refrigeration yarns;
s3, preparing a double-sided knitted fabric:
s31, knitting the radiation heating yarn and the radiation cooling yarn on a circular knitting machine to obtain the dual-mode radiation heat management knitted fabric.
In one possible implementation manner, in the step S11:
the soaking time of soaking the cotton yarn in ethanol is 4 to 8 hours; the cotton yarn after washing and airing is immersed in a mixed solution containing dopamine hydrochloride and ternary buffer solution and stirred for 24 to 48 hours under the condition of being protected from light at room temperature.
In one possible implementation manner, in the step S12:
and washing the impregnated cotton yarn by deionized water, and then placing the cotton yarn in an oven to dry for 1 to 3 hours at a drying temperature of 40 to 55 ℃.
In one possible implementation manner, in the step S13:
the soaking time of the polydopamine-cotton yarn in the MXene solution is 12 to 48 hours; the drying time under vacuum condition is 1-2 hours, and the drying temperature is 40-65 ℃.
In one possible implementation manner, in the step S21:
the stirring time for stirring in the dissolution tank to form a homogeneous solution is 1 to 4 hours.
In one possible implementation manner, in the step S22:
the stretching speeds of the three drafts are respectively set to be 2 to 3m/min,3.2 to 4m/min and 4.5 to 5.4m/min; the drying temperature of the dry winding is 50 to 90 ℃.
The technical scheme provided by the application has the beneficial effects that at least:
1. the dual-mode radiation heat management knitted fabric is a double-sided knitted fabric formed by knitting radiation refrigeration yarns and radiation heating yarns, and the two sides of the double-sided knitted fabric respectively have radiation refrigeration effect and radiation heating effect and can be dynamically adjusted according to the change of seasons and weather;
2. the dual-mode radiation heat management knitted fabric adopts the traditional spinning technology, such as wet spinning, melt spinning and the like, can be produced in a large scale, and has low production cost and high production efficiency;
3. the dual-mode radiation heat management knitted fabric is knitted by adopting a knitting technology, has high production efficiency and strong designability, and can design different double-sided fabrics according to the needs;
4. the dual-mode radiant heat management knitted fabric is low in production cost and wider in application range, is more suitable for being applied to aspects of intelligent heat management clothing, energy-saving buildings and the like, and solves the problems that radiant heat management materials are static, single in function, high in production cost and incapable of being produced on a large scale in the prior art.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:
FIG. 1 is a schematic view showing the structure of a dual-mode radiant heat management knitted fabric according to a first embodiment of the present application;
fig. 2 is a flowchart of a method for preparing a dual-mode radiant heat management knitted fabric according to a second embodiment of the present application;
FIG. 3 is a process weave diagram of a dual mode radiant heat management knitted fabric according to a third embodiment of the present application;
fig. 4 shows a cooling/heating temperature change chart of a dual-mode radiant heat management knitted fabric according to a third embodiment of the present application, in which: cotton cloth is a control group;
fig. 5 shows a schematic diagram of a change in cooling/heating temperature of a dual-mode radiant heat management knitted fabric knitted by C1 and H1 according to a fourth embodiment of the present application, in which: the cotton is cotton control group;
fig. 6 shows a schematic diagram of a change in cooling/heating temperature of a dual-mode radiant heat management knitted fabric knitted by C2 and H2 according to a fourth embodiment of the present application, in which: the cotton is cotton control group;
fig. 7 is a schematic diagram showing a change in cooling/heating temperature of a dual-mode radiant heat management knitted fabric knitted by C3 and H3 according to a fourth embodiment of the present application, in which: the cotton control group was cotton.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings of the present application, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, a specific component. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present specification, the meaning of "plurality" is two or more.
First, the terms involved in the embodiments of the present application will be briefly described:
three-way drafting refers to the process of drawing and thinning the fiber strands in spinning or spinning, and three-way drafting refers to the process of matching and drafting through a plurality of drafting rollers for three times.
The application will be further described with reference to the drawings and examples.
Embodiment one:
fig. 1 shows a schematic structural view of a dual-mode radiant heat management knitted fabric according to an exemplary embodiment of the present application, which is a double-sided knitted fabric knitted by a radiant cooling yarn 1 and a radiant heating yarn 2, both sides of the double-sided knitted fabric having a radiant cooling effect and a radiant heating effect, respectively; the radiation refrigeration yarn 1 is prepared by a spinning process, the surface of the radiation refrigeration yarn 1 is in a porous structure, and the raw material of the radiation refrigeration yarn 1 is a polymer with inherent infrared absorption; the radiation heating yarn 2 is prepared by coating cotton yarn.
In the embodiment of the application, under the condition of low air temperature, the radiation heating surface is outside, so that the temperature of an object can be increased; under the condition of high air temperature, the radiation refrigerating surface is outside, so that the temperature of the object can be reduced.
In the embodiment of the application, in order to achieve the radiation refrigeration effect, the polymer material is generally of a porous structure; the porous structure of the fabric can be realized by bending the yarn into loops in the knitting process of the yarn or by treating the surface of the yarn; the porous structure of the surface of the radiation refrigeration yarn 1 can be realized by a phase separation method, a plasma etching method and the like.
Alternatively, the raw materials of the radiation refrigeration yarn 1 include at least one of polyvinylidene fluoride, polydimethylsiloxane, polymethyl methacrylate, which have high infrared emissivity due to their special functional groups (such as C-F, C-O and C-Si).
Optionally, the coating raw material for coating the cotton yarn at least comprises one of MXene, carbon nano tube, carbon black, graphene, noble metal plasma nano particles and multilayer selective solar absorbing material.
Alternatively, the radiation refrigeration yarn 1 is prepared by wet spinning or melt spinning, depending on the nature of the spinning raw material.
Alternatively, the dual mode radiant heat management knitted fabric is a double knit fabric knitted by a warp knitting technique or a weft knitting technique from the radiant cooling yarn 1 and the radiant heating yarn 2.
Optionally, the dual-mode radiant heat management knitted fabric can be specifically adjusted according to the application requirements of different specific scenes, and the temperature adjustment and the fabric specification can be realized by adjusting specific spinning technology, coating technology and weaving technology.
Embodiment two:
fig. 2 shows a flowchart of a method for preparing a dual mode radiant heat management knitted fabric according to an exemplary embodiment of the present application, the method being used for preparing the dual mode radiant heat management knitted fabric according to embodiment one, the method comprising the steps of:
step S1, preparing radiation heating yarns:
and S11, soaking the cotton yarn in ethanol for a plurality of hours, washing with clear water, airing, soaking the washed and aired cotton yarn in a mixed solution containing dopamine hydrochloride and ternary buffer solution, and stirring for a plurality of hours at room temperature in a dark condition to obtain the soaked cotton yarn.
In this step S11, the soaking time of the cotton yarn in ethanol is 4 to 8 hours; the cotton yarn after washing and airing is immersed in a mixed solution containing dopamine hydrochloride and ternary buffer solution and stirred for 24 to 48 hours under the condition of being protected from light at room temperature.
In the step S11, dopamine hydrochloride is polymerized to generate a compact polydopamine coating which is deposited on the surface of cotton yarn.
And step S12, washing the impregnated cotton yarn by deionized water, and then placing the cotton yarn in an oven for drying to obtain the polydopamine-cotton yarn.
In this step S12, the impregnated cotton yarn is dried in an oven for 1 to 3 hours at a drying temperature of 40 to 55 ℃ after being washed with deionized water.
And S13, soaking the polydopamine-cotton yarn in an MXene solution for a plurality of hours, grafting the MXene on the polydopamine in the process, washing the polydopamine by deionized water, and drying the polydopamine-cotton yarn under a vacuum condition to obtain the radiation heating yarn.
In this step S13, the soaking time of the polydopamine-cotton yarn in the MXene solution is 12 to 48 hours; the drying time under vacuum condition is 1-2 hours, and the drying temperature is 40-65 ℃.
Step S2, preparing radiation refrigeration yarns:
and S21, adding polyvinylidene fluoride powder into dimethylformamide solvent at normal temperature to prepare spinning solution, and stirring in a dissolving tank to form homogeneous solution.
In this step S21, the stirring time for stirring in the dissolution tank to form a homogeneous solution is 1 to 4 hours.
In the step S21, polyvinylidene fluoride has strong absorption and high infrared emission characteristics due to the bending vibration of the C-F bond in the middle infrared band, and is suitable for being used as a radiation refrigerating material.
And S22, extruding the homogeneous solution through a spinneret plate, entering distilled water coagulation bath, and carrying out three-way drafting, drying and winding to obtain the radiation refrigeration yarn.
In this step S22, the stretching speeds of the three drafts are set to 2 to 3m/min,3.2 to 4m/min, and 4.5 to 5.4m/min, respectively; the drying temperature of the dry winding is 50 to 90 ℃.
In this step S22, the polyvinylidene fluoride yarn surface appeared smooth, but micropores with uniform surface could be seen after enlarging the fiber surface, because the solvent dimethylformamide was phase-converted in contact with distilled water.
Step S3, preparing double-sided knitted fabric:
and S31, knitting the radiation heating yarn and the radiation cooling yarn on a circular knitting machine to obtain the dual-mode radiation heat management knitted fabric.
For a better understanding of the present application, reference is made to the following description of the application taken in conjunction with the accompanying drawings and to a number of specific embodiments. It should be noted that the embodiments described in this specific embodiment are only some embodiments of the present application, and do not limit the scope of protection of the present application.
Embodiment III:
the present embodiment provides a method for preparing a dual mode radiant heat management knitted fabric, which is used for preparing the dual mode radiant heat management knitted fabric according to the first embodiment, and the method comprises the following steps:
step S1, preparing radiation heating yarns:
step 11, soaking cotton yarn of 22.4tex in ethanol for 6 hours, washing with clear water, airing, soaking the washed and aired cotton yarn in a mixed solution containing dopamine hydrochloride (3 mg/ml) and ternary buffer solution (10 mmol/L, pH=8.5) and stirring for 24 hours at room temperature under a dark condition to obtain the soaked cotton yarn; in the process, dopamine hydrochloride is polymerized to generate compact polydopamine coating which is deposited on the surface of cotton yarn.
And step S12, washing the impregnated cotton yarn by deionized water, and then placing the cotton yarn in an oven for drying (the drying time is 2 hours and the drying temperature is 50 ℃) to obtain the polydopamine-cotton yarn.
And S13, soaking the polydopamine-cotton yarn in an MXene solution (5 mg/ml) for 24 hours, grafting the MXene on the polydopamine in the process, washing the polydopamine with deionized water, and drying the polydopamine-cotton yarn under a vacuum condition (drying time is 1 hour, and drying temperature is 65 ℃), thereby obtaining the radiation heating yarn.
S2, preparing radiation refrigeration yarns (preparing 75D/96F polyvinylidene fluoride PVDF multifilament by adopting a wet spinning process), wherein the polyvinylidene fluoride PVDF multifilament has strong absorption and high infrared emission characteristics due to C-F bond bending vibration in a middle infrared band, and is suitable for being used as radiation refrigeration materials):
step S21, adding polyvinylidene fluoride powder (16 g) to dimethylformamide solvent (120 ml) at normal temperature to prepare spinning solution, and stirring in a dissolution tank for 1 hour to form homogeneous solution.
And S22, extruding the homogeneous solution through a spinneret plate, entering a distilled water coagulation bath, and performing three-way drafting (the stretching speeds of the three-way drafting are respectively set to be 2.6m/min,3.5m/min and 4.8 m/min) and dry-winding (the drying temperature is 60 ℃), thereby obtaining the radiation refrigeration yarn.
Step S3, preparing double-sided knitted fabric:
and S31, knitting the radiation heating yarn and the radiation cooling yarn on a circular knitting machine to obtain the dual-mode radiation heat management knitted fabric.
In the embodiment, the knitting is carried out on an E28 double-sided upper-2 lower-2-needle circular knitting machine, the process knitting diagram is shown in figure 3 (1, radiation heating yarn, 2 and radiation refrigerating yarn in the diagram), six paths are knitted into a complete structure, and the weight of the fabric per unit area is 158g/m < 2 >.
And (3) effect verification:
fig. 4 shows a graph of a change in cooling/heating temperature of the dual-mode radiant heat management knitted fabric according to the third embodiment of the present application, and an effect test was performed on the dual-mode radiant heat management knitted fabric prepared in the present embodiment. The prepared dual-mode radiant heat management knitted fabric was cut to a size of 2cm x 2cm and placed on a thermocouple resistor, and a piece of white cotton cloth without any treatment was used as a control group. The experimental result shows that the radiation cooling surface is at most 6.8 ℃ lower than the temperature of the cotton cloth control group, the radiation heating surface is at most 15.5 ℃ higher than the temperature of the cotton cloth control group, and the dual-mode radiation heat management knitted fabric has good heat management effect.
Embodiment four:
in order to explore the effect of the concentration of the spinning solution and the concentration of the MXene solution on the radiation refrigerating/heating effect of the fabric, the present embodiment provides a method for preparing a dual mode radiation heat management knitted fabric, which is used for preparing the dual mode radiation heat management knitted fabric according to the first embodiment, the method comprises the following steps:
step S1, preparing three radiation heating yarns:
step 11, soaking cotton yarn of 22.4tex in ethanol for 6 hours, washing with clear water, airing, soaking the washed and aired cotton yarn in a mixed solution containing dopamine hydrochloride (3 mg/ml) and ternary buffer solution (10 mmol/L, pH=8.5) and stirring for 24 hours at room temperature under a dark condition to obtain the soaked cotton yarn; in the process, dopamine hydrochloride is polymerized to generate compact polydopamine coating which is deposited on the surface of cotton yarn.
And step S12, washing the impregnated cotton yarn by deionized water, and then placing the cotton yarn in an oven for drying (the drying time is 2 hours and the drying temperature is 50 ℃) to obtain the polydopamine-cotton yarn.
Step S13, respectively soaking the polydopamine-cotton yarn in 10mg/ml, 8mg/ml and 5mg/ml of MXene solution for 24 hours, grafting the MXene on the polydopamine in the process, washing by deionized water, and drying under vacuum (drying time is 1 hour and drying temperature is 65 ℃), thereby obtaining the radiation heating yarn, wherein the three radiation heating yarns are respectively named as H1 (corresponding to 10mg/ml of MXene solution), H2 (corresponding to 8mg/ml of MXene solution) and H3 (corresponding to 5mg/ml of MXene solution).
S2, preparing radiation refrigeration yarns (preparing 75D/96F polyvinylidene fluoride PVDF multifilament by adopting a wet spinning process), wherein the polyvinylidene fluoride PVDF multifilament has strong absorption and high infrared emission characteristics due to C-F bond bending vibration in a middle infrared band, and is suitable for being used as radiation refrigeration materials):
step S21, respectively adding 18g, 16g and 12g of polyvinylidene fluoride powder into dimethylformamide solvent (120 ml) at normal temperature to prepare three spinning solutions with different concentrations, and stirring in a dissolving tank for 1 hour to form a homogeneous solution.
Step S22, extruding the homogeneous solution through a spinneret plate, entering a distilled water coagulation bath, and carrying out three drafting (the stretching speeds of the three drafting are respectively set to be 2.6m/min,3.5m/min and 4.8 m/min), and drying and winding (the drying temperature is 60 ℃), so as to obtain radiation refrigeration yarns, wherein the three radiation refrigeration yarns are respectively named as C1 (corresponding to 18g of polyvinylidene fluoride powder), C2 (corresponding to 16g of polyvinylidene fluoride powder) and C3 (corresponding to 13g of polyvinylidene fluoride powder).
Step S3, preparing double-sided knitted fabric:
and S31, knitting the three groups of radiation heating yarns and the three groups of radiation cooling yarns on a circular knitting machine respectively to obtain three groups of dual-mode radiation heat management knitted fabric samples, namely a sample 1 formed by knitting C1 and H1, a sample 2 formed by knitting C2 and H2, and a sample 3 formed by knitting C3 and H3.
In the embodiment, knitting is carried out on an E28 double-sided upper-2 lower-2-needle circular knitting machine, and a process knitting diagram is shown in fig. 3 (1, radiation heating yarn, 2 and radiation refrigerating yarn in the diagram), and six paths are knitted to form a complete structure.
And (3) effect verification:
fig. 5, 6 and 7 show a cooling/heating temperature change chart of a dual-mode radiant heat management knitted fabric provided in a fourth embodiment of the present application, and effect tests are performed on the dual-mode radiant heat management knitted fabric prepared in the present embodiment, so as to study the effect of the concentration of the spinning solution and the concentration of the MXene solution on the radiant cooling/heating effect of the knitted fabric. The dual-mode radiant heat management knitted fabric prepared in example four was cut to a size of 2cm x 2cm and placed on a thermocouple resistor, and a piece of white cotton cloth without any treatment was used as a control group.
The experimental results are shown in the following table 1, the radiation cooling surface of the sample 1 is at most 7.9 ℃ lower than the temperature of the cotton cloth control group (chip), the radiation heating surface of the sample 2 is at most 18 ℃ higher than the temperature of the cotton cloth control group (chip), the radiation heating surface of the sample 2 is at most 6.8 ℃ lower than the temperature of the cotton cloth control group (chip), the radiation heating surface of the sample 3 is at most 16.8 ℃ higher than the temperature of the cotton cloth control group (chip), the radiation heating surface of the sample 3 is at most 6.4 ℃ lower than the temperature of the cotton cloth control group (chip), the radiation heating surface of the sample is at most 15.5 ℃ higher than the temperature of the cotton cloth control group (chip), and the good thermal management effect of the dual-mode radiation thermal management knitted fabric is shown. Experimental results show that the concentration of the spinning solution and the concentration of the MXene have important influence on the radiation refrigerating/heating effect, and in a certain range, the higher the concentration of the spinning solution is, the better the refrigerating effect is, and the higher the concentration of the MXene is, the better the heating effect is. However, the concentration exceeds a certain range, the difficulty of spinning and coating is increased, the effect is poor, and the cost is increased.
Table 1:
| sample numbering | Yarn | Maximum refrigeration temperature | Maximum heating temperature |
| 1 | C1/H1 | 7.9 | 18 |
| 2 | C2/H2 | 6.8 | 16.8 |
| 3 | C3/H3 | 6.4 | 15.5 |
In summary, the dual-mode radiation thermal management knitted fabric provided by the application is a double-sided knitted fabric formed by knitting radiation refrigeration yarns and radiation heating yarns, and the two sides of the double-sided knitted fabric respectively have radiation refrigeration effect and radiation heating effect and can be dynamically adjusted according to the change of seasons and weather; the dual-mode radiation heat management knitted fabric adopts the traditional spinning technology, such as wet spinning, melt spinning and the like, can be produced in a large scale, and has low production cost and high production efficiency; the dual-mode radiation heat management knitted fabric is knitted by adopting a knitting technology, has high production efficiency and strong designability, and can design different double-sided fabrics according to the needs; the dual-mode radiant heat management knitted fabric is low in production cost and wider in application range, is more suitable for being applied to aspects of intelligent heat management clothing, energy-saving buildings and the like, and solves the problems that radiant heat management materials are static, single in function, high in production cost and incapable of being produced on a large scale in the prior art.
The foregoing is only a preferred embodiment of the application, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the application.
Claims (10)
1. The double-mode radiation heat management knitted fabric is characterized by being a double-sided knitted fabric formed by knitting radiation refrigeration yarns and radiation heating yarns, wherein two sides of the double-sided knitted fabric have radiation refrigeration effects and radiation heating effects respectively; the radiation refrigeration yarn is prepared by a spinning process, the surface of the radiation refrigeration yarn is in a porous structure, and the raw material of the radiation refrigeration yarn is a polymer with inherent infrared absorption; the radiation heating yarn is prepared by coating cotton yarn.
2. The dual mode radiant heat management knitted fabric of claim 1, wherein the raw material of the radiant refrigeration yarn comprises at least one of polyvinylidene fluoride, polydimethylsiloxane, polymethyl methacrylate.
3. The dual mode radiant heat management knitted fabric of claim 1, wherein the coating material for coating the cotton yarn comprises at least one of MXene, carbon nanotubes, carbon black, graphene, noble metal plasmonic nanoparticles, and multilayer selective solar absorbing material.
4. The dual mode radiant heat management knitted fabric of claim 1, wherein the radiant refrigerant yarn is prepared by wet spinning or melt spinning.
5. A method for preparing a dual mode radiant heat management knitted fabric, characterized in that the method is used for preparing the dual mode radiant heat management knitted fabric according to any one of claims 1 to 4, the method comprising the steps of:
s1, preparing radiation heating yarns:
s11, soaking cotton yarn in ethanol for a plurality of hours, washing with clear water, airing, soaking the washed and aired cotton yarn in a mixed solution containing dopamine hydrochloride and ternary buffer solution, and stirring for a plurality of hours at room temperature in a dark condition to obtain the soaked cotton yarn;
s12, washing the impregnated cotton yarn by deionized water, and then placing the cotton yarn in an oven for drying to obtain polydopamine-cotton yarn;
s13, soaking the polydopamine-cotton yarn in an MXene solution for a plurality of hours, grafting the MXene on polydopamine in the process, washing the polydopamine by deionized water, and drying the polydopamine-cotton yarn under a vacuum condition to obtain radiation heating yarn;
s2, preparing radiation refrigeration yarns:
s21, adding polyvinylidene fluoride powder into dimethylformamide solvent at normal temperature to prepare spinning solution, and stirring in a dissolving tank to form homogeneous solution;
s22, extruding the homogeneous solution through a spinneret plate, entering distilled water to be coagulated, and carrying out three-way drafting, drying and winding to obtain radiation refrigeration yarns;
s3, preparing a double-sided knitted fabric:
s31, knitting the radiation heating yarn and the radiation cooling yarn on a circular knitting machine to obtain the dual-mode radiation heat management knitted fabric.
6. The method for producing a dual mode radiant heat management knitted fabric according to claim 5, wherein in step S11:
the soaking time of soaking the cotton yarn in ethanol is 4 to 8 hours;
the cotton yarn after washing and airing is immersed in a mixed solution containing dopamine hydrochloride and ternary buffer solution and stirred for 24 to 48 hours under the condition of being protected from light at room temperature.
7. The method for producing a dual mode radiant heat management knitted fabric according to claim 5, wherein in step S12:
and washing the impregnated cotton yarn by deionized water, and then placing the cotton yarn in an oven to dry for 1 to 3 hours at a drying temperature of 40 to 55 ℃.
8. The method for producing a dual mode radiant heat management knitted fabric according to claim 5, wherein in step S13:
the soaking time of the polydopamine-cotton yarn in the MXene solution is 12 to 48 hours;
the drying time under vacuum condition is 1-2 hours, and the drying temperature is 40-65 ℃.
9. The method for producing a dual mode radiant heat management knitted fabric according to claim 5, wherein in step S21:
the stirring time for stirring in the dissolution tank to form a homogeneous solution is 1 to 4 hours.
10. The method for producing a dual mode radiant heat management knitted fabric according to claim 5, wherein in step S22:
the stretching speeds of the three drafts are respectively set to be 2 to 3m/min,3.2 to 4m/min and 4.5 to 5.4m/min;
the drying temperature of the dry winding is 50 to 90 ℃.
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