CN112341656B - Preparation method of wearable membrane material with triple heat-preservation function and material thereof - Google Patents
Preparation method of wearable membrane material with triple heat-preservation function and material thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/06—Thermally protective, e.g. insulating
- A41D31/065—Thermally protective, e.g. insulating using layered materials
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/14—Air permeable, i.e. capable of being penetrated by gases
- A41D31/145—Air permeable, i.e. capable of being penetrated by gases using layered materials
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/30—Antimicrobial, e.g. antibacterial
- A41D31/305—Antimicrobial, e.g. antibacterial using layered materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/02—Cellulose; Modified cellulose
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- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention belongs to the technical field of composite materials, and relates to a preparation method of a wearable membrane material with triple heat preservation functions, which comprises the following steps: dispersing the purified biomass cellulose in distilled water, transferring the purified biomass cellulose into a membrane making device, and drying to obtain a biomass cellulose base membrane; dispersing the nickel/silver nanowires with the core-shell structure in a solvent, and performing vacuum filtration to pump-filter the nickel/silver nanowires with the core-shell structure onto the surface of the biomass cellulose base membrane to form a heat-insulating layer with the functions of radiation heat insulation and electric heating heat insulation; and finally, dispersing the monodisperse boron nitride nanosheets in a solvent, and performing vacuum filtration on the other surface of the material prepared in the step to obtain the nano-composite material. The invention discloses a preparation method of a wearable membrane material with triple heat preservation functions, which is simple, convenient and environment-friendly and has the characteristics of energy conservation and emission reduction. The prepared membrane material has good functions of better antibiosis, flexibility and air permeability, and realizes accurate human body heat management through function and structure integration.
Description
Technical Field
The invention belongs to the technical field of composite materials, relates to a radiation heat-insulating film material, and particularly relates to a preparation method and a material of a wearable film material with triple heat-insulating functions.
Background
Maintaining normal body temperature is critical to human metabolism and life activities, and especially under extreme conditions, the comfort requirements of human bodies are difficult to meet by only using clothes such as wadded jackets, down jackets and the like. The heat of the human body is mainly released in a radiation mode, the common thermal insulation suit has high infrared emissivity, and the radiation of the human body is easily emitted to the outside to cause the loss of heat radiation. In order to reduce the radiation loss of human body, the development of low infrared emissivity materials is urgently needed to effectively control the heat radiation of human body.
Today, thermal management materials with low emissivity are prepared and achieve thermal insulation by modulating human body radiation. However, these thermal management materials have the disadvantages of single function, low temperature-raising efficiency, and the like. The development of the wearable film material with the combination of the infrared thermal management and the electric heating functions can not only make up for the defect of slow temperature rise, but also realize the function of heat preservation as required. Although the electric heating can quickly reach the comfortable temperature of the human body, a large amount of joule heat is still released to the environment due to the low external temperature, so that a large amount of energy is consumed to maintain the body temperature balance. In order to prevent the loss of joule heat, designing a material with low thermal conductivity as an outer layer effectively prevents the loss of heat, and achieving a heat insulation effect is urgent. Therefore, the triple thermal insulation material integrating the function and the structure is researched and has innovative significance and potential application value in the aspect of personal thermal management.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of a wearable membrane material with triple heat preservation functions.
The technical scheme is as follows:
a preparation method of a wearable membrane material with a triple heat preservation function comprises the following steps:
a) and preparing a base film: dispersing the purified biomass cellulose in distilled water according to the mass-volume ratio of the biomass cellulose to the distilled water of 1: 20-1: 5 g/mL, preferably 1:10 g/mL, transferring the biomass cellulose into a membrane making device, and drying to obtain a biomass cellulose base membrane;
b) preparing a radiation heat-insulating layer and an electric heating layer: dispersing the nickel/silver nanowires with the core-shell structure in a solvent according to the solid-to-liquid ratio of the nickel/silver nanowires with the core-shell structure to the solvent of 1: 50-1: 30 g/mL, preferably 1:40 g/mL, and performing vacuum filtration to pump-filter the nickel/silver nanowires with the core-shell structure to the surface of the biomass cellulose base membrane to form a heat insulation layer with the functions of radiation heat insulation and electric heating heat insulation, wherein the mass ratio of the silver to the nickel nanowires is 1: 1-1: 5 g/g;
c) and preparing a heat insulation layer: and (b) dispersing the monodisperse boron nitride nanosheets in the solvent according to the mass-volume ratio of 1: 20-1: 10 g/mL, preferably 1:20 g/mL, and performing vacuum filtration on the other side of the material prepared in the step b) to obtain the wearable membrane material with the triple heat-preservation function.
In a preferred disclosed example of the invention, the biomass cellulose in the step a) is one or more of cattail pollen cellulose, reed leaf cellulose or corn husk cellulose; the cellulose content is more than 80-95%.
In the preferred embodiment of the invention, the drying temperature in the step a) is 40-65 ℃.
In a preferred embodiment of the present invention, the preparation of the core-shell structured nickel/silver nanowire in step b) comprises:
dissolving nickel chloride hexahydrate in glycol according to the mass-volume ratio of the nickel chloride hexahydrate to the glycol of 1: 60-1: 30 g/mL, preferably 1:45 g/mL, and heating at 120-150 ℃ for 8-10 min;
quickly dropwise adding hydrazine monohydrate according to the volume ratio of the hydrazine monohydrate to the ethylene glycol of 1: 10-1: 5 mL/mL, preferably 3:20 mL/mL, continuously reacting for 15-25 min, and washing with distilled water and ethanol to obtain nickel nanowires;
dispersing the nickel nanowires and the anhydrous glucose in 50 mL of distilled water for later use according to the mass ratio of the nickel nanowires to the anhydrous glucose of 1: 15-1: 3 g/g, preferably 1:4 g/g;
dissolving silver nitrate into 50 mL of distilled water according to the mass ratio of the silver nitrate to the anhydrous glucose of 1: 2-1: 6 g/g, dropwise adding 25% ammonia water solution into the silver nitrate solution under magnetic stirring at room temperature to prepare silver ammonia solution, dropwise adding ethylenediamine solution to adjust the pH value to 9, and stopping stirring;
and (3) quickly transferring the solution to be used to a silver ammonia solution, standing for reaction for 10-20 min, and washing with distilled water for several times to obtain the nickel/silver nanowire with the core-shell structure.
In the preferred embodiment of the present invention, the solvent in step b) is one or more of distilled water, methanol, ethanol or isopropanol.
In the preferred embodiment of the present invention, the solvent in step c) is one or more of distilled water, isopropanol or ethylene glycol.
The invention also aims to disclose the wearable membrane material with the triple heat preservation function prepared by the method.
A wearable membrane material with triple heat preservation functions is formed by self-assembling a nickel/silver nanowire with a core-shell structure, biomass fibers and a monodisperse boron nitride nanosheet layer; the nickel/silver nanowire of the core-shell structure has the length of 50-110 mu m and the diameter of 0.5-1.5 mu m; the biomass fiber is one or a combination of more of cattail pollen cellulose, reed leaf cellulose or corn husk cellulose, the length is more than 500 mu m, and the diameter is 8-15 mu m; the size of the monodisperse boron nitride nanosheet is 4-16 mu m2A thickness of 5 to 15 nm and a thermal conductivity of 0.01 to 0.3 W.m-1·K-1。
The thickness of the wearable membrane material is 100-200 mu m; the triple heat preservation functions are radiation heat preservation, electric heating heat preservation and heat insulation heat preservation, and the antibacterial property, the air permeability and the mechanical property are better.
The invention has the characteristics that:
(1) compared with the traditional heat-insulating clothes which cannot realize the comfort of a human body in severe environment, the wearable film material with the triple heat-insulating function provided by the invention can effectively realize accurate heat management;
(2) most of heat insulation materials lack heat insulation effect and easily dissipate heat to a low-temperature environment, and the wearable film material with the triple heat insulation function provided by the invention has a good heat insulation function;
(3) the wearable membrane material with the triple heat-insulating function provided by the invention has a laminated structure, a triple heat-insulating function and good flexibility, and can realize the functions of triple heat insulation, antibiosis, flexibility, air permeability and the like.
Advantageous effects
The invention provides a preparation method of a wearable membrane material with triple heat preservation functions, which is simple, convenient and environment-friendly and has the characteristics of energy conservation and emission reduction. The prepared wearable membrane material with the triple heat-preservation function realizes accurate human body heat management by constructing the triple heat-preservation membrane material through function and structure integration. The nickel/silver nanowire with the core-shell structure and the radiation heat preservation and electric heating functions is selected as the inner layer of the wearable membrane material with the triple heat preservation function, and the composition and the structure of the material are controllable; the cheap and renewable substance cellulose is selected as the middle layer, so that the mechanical property and flexibility of the wearable membrane material with the triple heat-preservation function are improved; the monodisperse boron nitride nanosheet with low heat conductivity coefficient is selected as the outer layer, and the material has a good heat insulation function. The film has good antibacterial property, flexibility and air permeability, and can be used as human body heat management material.
Drawings
FIG. 1 is a Scanning Electron Microscope (SEM) image of a sample prepared in example 1, wherein (a) a biomass cellulose membrane, (b) a nickel/silver nanowire layer with a core-shell structure, (c) a monodisperse boron nitride nanosheet layer, and (d) a cross section of a wearable membrane material with a triple heat preservation function.
Detailed Description
The present invention will be described in detail below with reference to examples to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the following examples.
Example 1
A preparation method of a wearable membrane material with a triple heat preservation function comprises the following steps:
(a) and preparing a base film: weighing 2 g of purified cattail pollen cellulose, dispersing the cattail pollen cellulose in 20 mL of distilled water, transferring the solution into a membrane making device, and drying the solution at 40 ℃ to obtain a cattail pollen cellulose base membrane;
(b) and preparing the nickel-silver nanowire with the core-shell structure: weighing 1.2 g of nickel chloride hexahydrate, dissolving in 50 mL of ethylene glycol, heating at 150 ℃ for 10 min, quickly dropwise adding 7.5 mL of hydrazine monohydrate, continuing to react for 20 min, and washing with distilled water and ethanol to obtain nickel nanowires; then 0.2 g of nickel nanowire and 0.7 g of anhydrous glucose are respectively weighed and dispersed in 50 mL of distilled water for standby; weighing 0.18 g of silver nitrate, dissolving the silver nitrate in 50 mL of distilled water, dropwise adding 25% ammonia water solution into the silver nitrate solution under magnetic stirring at room temperature to prepare silver-ammonia solution, dropwise adding ethylenediamine solution to adjust the pH value to 9, and stopping stirring; and then, quickly transferring the solution to be used to a silver ammonia solution, standing for reaction for 15 min, and washing with distilled water for several times to obtain the nickel-silver nanowire with the core-shell structure.
(c) And preparing a radiation heat preservation layer and an electric heating layer: weighing 1.0 g of nickel/silver nanowires with core-shell structures, dispersing the nickel/silver nanowires in 30 mL of distilled water, and carrying out vacuum filtration on the nickel/silver nanowires with core-shell structures to the surface of the cattail pollen cellulose-based membrane to form a heat-insulating layer with the functions of radiation heat insulation and electric heating heat insulation;
(d) and preparing a heat insulation layer: and (b) weighing 1.0 g of monodisperse boron nitride nanosheets, dispersing in 30 mL of distilled water, and performing vacuum filtration on the other side of the material prepared in the step (b) to obtain the wearable membrane material with the triple heat-preservation function.
The cattail flower cellulose membrane as a firm base material is shown in figure 1 a; FIG. 1b shows a radiation heat-preservation and electric heating layer constructed by nickel-silver nanowires of a core-shell structure, wherein the nickel-silver nanowires of the core-shell structure are mutually wound to be beneficial to enhancing the firmness and the conductivity of the film, and an inset is a real object diagram of the surface; the heat-insulating layer composed of the monodisperse boron nitride nanosheets is shown in figure 1c, and is completely different from the surface appearance of the typha latifolia cellulose base membrane, so that the monodisperse boron nitride nanosheets are successfully deposited on the surface of the base membrane, and the inset is a real image of the surface; in addition, a cross-sectional view of a triple-function wearable membrane is presented in FIG. 1d, showing the membrane as being of three-layer construction with clear boundaries between layers, the membrane having a thickness of 103 μm; in conclusion, wearable membrane materials with triple heat preservation functions are successfully prepared.
Tests show that the nickel/silver nanowire with the core-shell structure as the inner layer has lower infrared emissivity (10%) and the conductivity is 1.0 multiplied by 107S/m; monodisperse nitridationThe boron nanosheet as the outer layer has a relatively low thermal conductivity (0.09 W.m)-1·K-1) (ii) a The thickness of the wearable membrane material with the triple heat preservation function is 103 micrometers, and the average tensile strength is 71.35 MPa.
Example 2
A preparation method of a wearable membrane material with a triple heat preservation function comprises the following steps:
(a) and preparing a base film: weighing 2 g of purified reed leaf cellulose, dispersing the purified reed leaf cellulose in 30 mL of distilled water, transferring the mixture into a membrane making device, and drying at 45 ℃ to obtain a reed leaf cellulose base membrane;
(b) and preparing the nickel-silver nanowire with the core-shell structure: weighing 1.2 g of nickel chloride hexahydrate, dissolving in 50 mL of ethylene glycol, heating at 150 ℃ for 10 min, quickly dropwise adding 7.5 mL of hydrazine monohydrate, continuing to react for 20 min, and washing with distilled water and ethanol to obtain nickel nanowires; then 0.15 g of nickel nanowire and 0.7 g of anhydrous glucose are respectively weighed and dispersed in 50 mL of distilled water for standby; weighing 0.18 g of silver nitrate, dissolving the silver nitrate in 50 mL of distilled water, dropwise adding 25% ammonia water solution into the silver nitrate solution under magnetic stirring at room temperature to prepare silver-ammonia solution, dropwise adding ethylenediamine solution to adjust the pH value to 9, and stopping stirring; and then, quickly transferring the solution to be used to a silver ammonia solution, standing for reaction for 15 min, and washing with distilled water for several times to obtain the nickel-silver nanowire with the core-shell structure.
(c) And preparing a radiation heat preservation layer and an electric heating layer: weighing 1.2 g of nickel/silver nanowires with a core-shell structure, dispersing the nickel/silver nanowires into 45 mL of methanol, and carrying out vacuum filtration on the nickel/silver nanowires with the core-shell structure to the surface of a reed leaf cellulose-based membrane to form a heat-insulating layer with the functions of radiation heat insulation and electric heating heat insulation;
(d) and preparing a heat insulation layer: and (b) weighing 1.2 g of monodisperse boron nitride nanosheets, dispersing in 45 mL of isopropanol, and performing vacuum filtration on the other side of the material prepared in the step (b) to obtain the wearable membrane material with the triple heat preservation function.
Tests show that the nickel/silver nanowire with the core-shell structure as the inner layer has lower infrared emissivity (9.8%) and the conductivity is 1.0 multiplied by 107S/m; monodisperse boron nitride nanosheets having a relatively low thermal conductivity as the outer layerNumber (0.08 W.m)-1·K-1) (ii) a The thickness of the wearable membrane material with the triple heat preservation function is 120 mu m, and the average tensile strength is 71.85 MPa.
Example 3
A preparation method of a wearable membrane material with a triple heat preservation function comprises the following steps:
(a) and preparing a base film: weighing 2.5 g of purified cattail leaf cellulose, dispersing the cattail leaf cellulose in 20 mL of distilled water, transferring the solution into a membrane making device, and drying the solution at 50 ℃ to obtain a cattail leaf cellulose base membrane;
(b) and preparing the nickel-silver nanowire with the core-shell structure: weighing 1.2 g of nickel chloride hexahydrate, dissolving in 50 mL of ethylene glycol, heating at 150 ℃ for 10 min, quickly dropwise adding 7.5 mL of hydrazine monohydrate, continuing to react for 20 min, and washing with distilled water and ethanol to obtain nickel nanowires; then 0.1 g of nickel nanowire and 1.05 g of anhydrous glucose are respectively weighed and dispersed in 50 mL of distilled water for standby; weighing 0.27 g of silver nitrate, dissolving the silver nitrate in 50 mL of distilled water, dropwise adding 25% ammonia water solution into the silver nitrate solution under magnetic stirring at room temperature to prepare silver-ammonia solution, dropwise adding ethylenediamine solution to adjust the pH value to 9, and stopping stirring; and then, quickly transferring the solution to be used to a silver ammonia solution, standing for reaction for 15 min, and washing with distilled water for several times to obtain the nickel-silver nanowire with the core-shell structure.
(c) And preparing a radiation heat preservation layer and an electric heating layer: weighing 2.0 g of nickel/silver nanowires with a core-shell structure, dispersing the nickel/silver nanowires into 65 mL of ethanol, and carrying out vacuum filtration to pump-filter the nickel/silver nanowires with the core-shell structure onto the surface of the cellulose-based membrane of the cattail leaf to form a heat-insulating layer with the functions of radiation heat insulation and electric heating heat insulation;
(d) and preparing a heat insulation layer: weighing 2.0 g of monodisperse boron nitride nanosheets, dispersing in 65 mL of ethylene glycol, and performing vacuum filtration on the other side of the material prepared in the step (b) to obtain the wearable membrane material with the triple heat-preservation function.
Tests show that the nickel/silver nanowire with the core-shell structure as the inner layer has lower infrared emissivity (8.7%) and the conductivity is 1.1 multiplied by 107S/m; the monodisperse boron nitride nanosheet has a relatively low thermal conductivity (0.02 W.m) as the outer layer-1·K-1) (ii) a Utensil for cleaning buttockThe thickness of the wearable membrane material with the triple heat preservation function is 148 mu m, and the average tensile strength is 74.65 MPa.
Example 4
A preparation method of a wearable membrane material with a triple heat preservation function comprises the following steps:
(a) and preparing a base film: weighing 2.5 g of purified cattail pollen cellulose, dispersing in 30 mL of distilled water, transferring into a membrane making device, and drying at 60 ℃ to obtain a cattail pollen cellulose base membrane;
(b) and preparing the nickel-silver nanowire with the core-shell structure: weighing 1.2 g of nickel chloride hexahydrate, dissolving in 50 mL of ethylene glycol, heating at 150 ℃ for 10 min, quickly dropwise adding 7.5 mL of hydrazine monohydrate, continuing to react for 20 min, and washing with distilled water and ethanol to obtain nickel nanowires; then 0.25 g of nickel nanowire and 1.83 g of anhydrous glucose are respectively weighed and dispersed in 50 mL of distilled water for standby; weighing 0.47 g of silver nitrate, dissolving the silver nitrate in 50 mL of distilled water, dropwise adding 25% ammonia water solution into the silver nitrate solution under magnetic stirring at room temperature to prepare silver-ammonia solution, dropwise adding ethylenediamine solution to adjust the pH value to 9, and stopping stirring; and then, quickly transferring the solution to be used to a silver ammonia solution, standing for reaction for 15 min, and washing with distilled water for several times to obtain the nickel-silver nanowire with the core-shell structure.
(c) And preparing a radiation heat preservation layer and an electric heating layer: weighing 1.6 g of nickel/silver nanowires with a core-shell structure, dispersing the nickel/silver nanowires into 55 mL of isopropanol, and carrying out vacuum filtration to pump-filter the nickel/silver nanowires with the core-shell structure onto the surface of the typha orientalis cellulose-based membrane to form a heat-insulating layer with the functions of radiation heat insulation and electric heating heat insulation;
(d) and preparing a heat insulation layer: and (b) weighing 1.6 g of monodisperse boron nitride nanosheets, dispersing in 55 mL of distilled water, and performing vacuum filtration on the other side of the material prepared in the step (b) to obtain the wearable membrane material with the triple heat-preservation function.
Tests show that the nickel/silver nanowire with the core-shell structure as the inner layer has lower infrared emissivity (9.2%) and the conductivity is 1.06 multiplied by 107S/m; the monodisperse boron nitride nanosheet has a relatively low thermal conductivity (0.05 W.m) as the outer layer-1·K-1) (ii) a Wearable membrane material with triple heat preservation functionHas a thickness of 155 μm and an average tensile strength of 73.85 MPa.
Example 5
A preparation method of a wearable membrane material with a triple heat preservation function comprises the following steps:
(a) and preparing a base film: 3 g of purified reed leaf cellulose is weighed and dispersed in 30 mL of distilled water, then transferred into a membrane making device, and dried at 55 ℃ to obtain a reed leaf cellulose base membrane;
(b) and preparing the nickel-silver nanowire with the core-shell structure: weighing 1.2 g of nickel chloride hexahydrate, dissolving in 50 mL of ethylene glycol, heating at 150 ℃ for 10 min, quickly dropwise adding 7.5 mL of hydrazine monohydrate, continuing to react for 20 min, and washing with distilled water and ethanol to obtain nickel nanowires; then 0.2 g of nickel nanowire and 1.26 g of anhydrous glucose are respectively weighed and dispersed in 50 mL of distilled water for standby; weighing 0.32 g of silver nitrate, dissolving the silver nitrate in 50 mL of distilled water, dropwise adding 25% ammonia water solution into the silver nitrate solution under magnetic stirring at room temperature to prepare silver-ammonia solution, dropwise adding ethylenediamine solution to adjust the pH value to 9, and stopping stirring; and then, quickly transferring the solution to be used to a silver ammonia solution, standing for reaction for 15 min, and washing with distilled water for several times to obtain the nickel-silver nanowire with the core-shell structure.
(c) And preparing a radiation heat preservation layer and an electric heating layer: weighing 1.4 g of nickel/silver nanowires with a core-shell structure, dispersing the nickel/silver nanowires into 50 mL of methanol, and carrying out vacuum filtration on the nickel/silver nanowires with the core-shell structure to the surface of a reed leaf cellulose-based membrane to form a heat-insulating layer with the functions of radiation heat insulation and electric heating heat insulation;
(d) and preparing a heat insulation layer: and (b) weighing 1.4 g of monodisperse boron nitride nanosheets, dispersing in 50 mL of isopropanol, and performing vacuum filtration on the other side of the material prepared in the step (b) to obtain the wearable membrane material with the triple heat preservation function.
Tests show that the nickel/silver nanowire with the core-shell structure as the inner layer has lower infrared emissivity (9.5%) and the conductivity is 1.03 multiplied by 107S/m; the monodisperse boron nitride nanosheet has a relatively low thermal conductivity (0.06 W.m) as the outer layer-1·K-1) (ii) a The thickness of the wearable film material with triple heat preservation functions is 175 mu m, and the average tensile strength is 75.25 MPa。
Example 6
A preparation method of a wearable membrane material with a triple heat preservation function comprises the following steps:
(a) and preparing a base film: 3 g of purified cattail leaf cellulose is weighed and dispersed in 40 mL of distilled water, then the solution is transferred into a membrane making device, and the cellulose-based basement membrane of the cattail leaf is obtained after drying at 65 ℃;
(b) and preparing the nickel-silver nanowire with the core-shell structure: weighing 1.2 g of nickel chloride hexahydrate, dissolving in 50 mL of ethylene glycol, heating at 150 ℃ for 10 min, quickly dropwise adding 7.5 mL of hydrazine monohydrate, continuing to react for 20 min, and washing with distilled water and ethanol to obtain nickel nanowires; then 0.3 g of nickel nanowire and 2.96 g of anhydrous glucose are respectively weighed and dispersed in 50 mL of distilled water for standby; weighing 0.76 g of silver nitrate, dissolving the silver nitrate in 50 mL of distilled water, dropwise adding 25% ammonia water solution into the silver nitrate solution under magnetic stirring at room temperature to prepare silver-ammonia solution, dropwise adding ethylenediamine solution to adjust the pH value to 9, and stopping stirring; and then, quickly transferring the solution to be used to a silver ammonia solution, standing for reaction for 15 min, and washing with distilled water for several times to obtain the nickel-silver nanowire with the core-shell structure.
(c) And preparing a radiation heat preservation layer and an electric heating layer: weighing 1.8 g of nickel/silver nanowires with core-shell structures, dispersing the nickel/silver nanowires in 60 mL of distilled water, and carrying out vacuum filtration on the nickel/silver nanowires with core-shell structures to the surface of the cellulose-based membrane of the cattail leaf to form a heat-insulating layer with the functions of radiation heat insulation and electric heating heat insulation;
(d) and preparing a heat insulation layer: and (b) weighing 1.8 g of monodisperse boron nitride nanosheets, dispersing in 60 mL of ethylene glycol, and performing vacuum filtration on the other side of the material prepared in the step (b) to obtain the wearable membrane material with the triple heat-preservation function.
Tests show that the nickel/silver nanowire with the core-shell structure as the inner layer has lower infrared emissivity (8.9%) and the conductivity is 1.08 multiplied by 107S/m; the monodisperse boron nitride nanosheet has a relatively low thermal conductivity (0.03 W.m) as the outer layer-1·K-1) (ii) a The thickness of the wearable membrane material with the triple heat preservation function is 180 mu m, and the average tensile strength is 75.6 MPa.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (10)
1. A preparation method of a wearable membrane material with a triple heat preservation function is characterized by comprising the following steps:
a) dispersing the purified biomass cellulose into distilled water according to the mass-volume ratio of the biomass cellulose to the distilled water of 1: 20-1: 5 g/mL, transferring the biomass cellulose into a membrane making device, and drying to obtain a biomass cellulose base membrane;
b) dispersing the nickel/silver nanowires with the core-shell structure in a solvent according to a solid-liquid ratio of the nickel/silver nanowires with the core-shell structure to the solvent of 1: 50-1: 30 g/mL, and performing vacuum filtration to pump-filter the nickel/silver nanowires with the core-shell structure to the surface of the biomass cellulose base membrane to form a heat insulation layer with radiation heat insulation and electric heating heat insulation functions, wherein the mass ratio of the silver to the nickel nanowires is 1: 1-1: 5 g/g;
c) and dispersing the monodisperse boron nitride nanosheets in the solvent according to the mass-volume ratio of 1: 20-1: 10 g/mL of the monodisperse boron nitride nanosheets to the solvent, and performing vacuum filtration on the other side of the material prepared in the step b) to obtain the nano-composite material.
2. The preparation method of the wearable membrane material with the triple heat preservation function according to claim 1, is characterized in that: the biomass cellulose in the step a) is one or more of cattail pollen cellulose, reed leaf cellulose or corn husk cellulose; the cellulose content is more than 80-95%.
3. The preparation method of the wearable membrane material with the triple heat preservation function according to claim 1, is characterized in that: the mass-to-volume ratio of the biomass cellulose to the distilled water in the step a) is 1:10 g/mL.
4. The preparation method of the wearable membrane material with the triple heat preservation function according to claim 1, is characterized in that: the drying temperature in the step a) is 40-65 ℃.
5. The preparation method of the wearable membrane material with the triple heat preservation function according to claim 1, is characterized in that: the solvent in the step b) is one or more of distilled water, methanol, ethanol or isopropanol.
6. The preparation method of the wearable membrane material with the triple heat preservation function according to claim 1, is characterized in that: the solid-to-liquid ratio of the nickel/silver nanowires with the core-shell structure to the solvent in the step b) is 1:40 g/mL.
7. The preparation method of the wearable membrane material with the triple heat preservation function according to claim 1, is characterized in that: the solvent in the step c) is one or more of distilled water, isopropanol or glycol.
8. The preparation method of the wearable membrane material with the triple heat preservation function according to claim 1, is characterized in that: the mass-to-volume ratio of the monodisperse boron nitride nanosheets to the solvent in step c) is 1:20 g/mL.
9. The wearable membrane material with the triple heat preservation function, which is prepared by the method according to any one of claims 1 to 8, is formed by self-assembling a nickel/silver nanowire with a core-shell structure, a biomass fiber and a monodisperse boron nitride nanosheet layer, and the thickness of the wearable membrane material is 100-200 μm.
10. The method of claim 9Wearable membrane material with triple heat preservation function, its characterized in that: the nickel/silver nanowire of the core-shell structure has the length of 50-110 mu m and the diameter of 0.5-1.5 mu m; the biomass fiber is one or a combination of more of cattail pollen cellulose, reed leaf cellulose or corn husk cellulose, the length is more than 500 mu m, and the diameter is 8-15 mu m; the size of the monodisperse boron nitride nanosheet is 4-16 mu m2A thickness of 5 to 15 nm and a thermal conductivity of 0.01 to 0.3 W.m-1·K-1。
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