CN111692459A - Fluorinated silica nanoparticle composite cucurbituril sponge vacuum insulation board core material and preparation method thereof - Google Patents
Fluorinated silica nanoparticle composite cucurbituril sponge vacuum insulation board core material and preparation method thereof Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
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- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
- C08J9/40—Impregnation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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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
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Abstract
The invention provides a fluorinated silica nanoparticle composite cucurbituril sponge Vacuum Insulation Panel (VIP) core material and a preparation method thereof. The VIP core material is composed of loofah sponge and fluorinated silicon dioxide nanoparticles, and the preparation method comprises the following steps: 1. preparing the loofah sponge. 2. Fluorinated silica nanoparticles (F-SiO2 NPs) were prepared. 3. The composite VIP core material is obtained by firmly anchoring fluorinated silica nanoparticles on the surface of sponge gourd through the reaction of isocyanate groups at two ends of 1, 6-hexamethylene diisocyanate and hydroxyl groups on the surfaces of the two. The invention adopts natural three-dimensional plant fiber materials, and has the characteristics of low cost, easy acquisition, greener production link, safety to human body and the like. The F-SiO2 NPs are fixed on the surface of the loofah sponge, so that the mechanical strength and the flame retardance of the sponge are improved, and the thermal conductivity of the sponge is reduced. In addition, F-SiO2 NPs have super-hydrophobicity, which is beneficial to prolonging the service life of the core material. In a word, the invention has wide prospect in the technical field of heat preservation and insulation materials.
Description
Technical Field
The invention relates to a fluorinated silica nanoparticle modified loofah cotton fiber vacuum insulation panel core material and a preparation method thereof, belonging to the technical field of heat insulation materials.
Background
With the rapid development of the economy of all countries, the problems of the world energy crisis and the environmental deterioration are brought forward. The adoption of the heat insulating material can greatly reduce energy consumption, and is a main measure for realizing the sustainable development of global economy. In recent years, the requirements for heat insulation, heat preservation, cold preservation, and energy conservation from various industries are increasing year by year. The thermal conductivity of conventional insulation materials, such as rock wool and perlite, is mostly higher than 20mW/(m · K), and the thermal insulation properties are mediocre and it has become increasingly difficult to meet the current high standards and requirements. Therefore, the development of new and efficient heat insulating materials is urgently needed.
As a novel efficient heat-insulating material, a Vacuum Insulation Panel (VIP Panel) has the characteristics of low heat conductivity coefficient, small volume, light weight, fire resistance, environmental friendliness, no pollution and the like. Compared with the traditional heat insulation material, the heat conductivity coefficient of the VIP plate can reach 0.002-0.004W/(m.K), the heat resistance of the VIP plate is 10 times or even higher than that of the common heat insulation material, the thickness of the VIP plate is only 1/5-1/10 of the common heat insulation material, and the VIP plate does not use Ozone Depletion Substances (ODS) or generate greenhouse gas substances in the production process, can be recycled, has the double advantages of environmental protection, safety and energy saving, and achieves the purpose of saving space.
In the conventional VIP panels, a particle-type core material, a foam-type core material, and a fiber-type core material are often used. Among them, the most closely related to the present invention is a fiber type core material. The glass fiber is a widely used fiber type core material, the production process of the glass fiber is high in energy consumption and pollution, and the wet molding process of the core material is high in energy consumption, large in waste water and waste gas discharge, complex in process and high in cost. Mineral wool meets both the fireproof and energy-saving requirements, but has limited resources in China and can cause harm to human bodies if a fire occurs. Moreover, the mature vacuum insulation panel core material prepared by adopting natural materials does not appear in China. Therefore, the novel VIP core material is low in cost, easy to obtain, green in production link and safe to human bodies.
Luffa sponge is a natural porous material obtained by removing skin and seeds from fully mature Luffa vegetable pulp. The loofah sponge mainly comprises cellulose, hemicellulose and lignin, and has a continuous, flexible and reticular three-dimensional (3D) structure. From the structural point of view, the macroscopic three-dimensional texture and the microscopic multi-layer pores of the natural loofah can be constructed into an advanced three-dimensional multi-interface structure body, and the natural loofah is an ideal choice for serving as a core material of a vacuum insulation panel. The VIP internal vacuum degree is reduced due to external gas permeation and internal material degassing of the VIP, so that the effective service life of the loofah sponge fiber VIP can be shortened only in a normal-temperature and standing environment, and the application of the loofah sponge fiber VIP in the field with a harsher service environment is difficult. The invention provides a fluorinated silica nanoparticle (F-SiO2 NPs) composite VIP core material of loofah sponge, which effectively solves the problem of short service life of loofah sponge, obtains super-hydrophobicity, lower thermal conductivity and higher mechanical strength, and has wider prospect.
Disclosure of Invention
The invention provides a novel composite VIP core material of fluorinated silica nanoparticle composite sponge and a preparation method thereof.
The technical scheme of the material comprises the following steps: the composite VIP core material is composed of loofah sponge and fluorinated silica nanoparticles, and the connection mode is that isocyanate groups at two ends of 1, 6-hexamethylene diisocyanate react with hydroxyl groups on the surfaces of the two to form firm chemical bonds, so that the fluorinated silica nanoparticles are anchored on the surface of the loofah sponge
The fluorinated silica nanoparticles have superhydrophobicity due to being functionalized, low thermal conductivity, and have a zero-dimensional inorganic structure.
The 1, 6-hexamethylene diisocyanate can be replaced by other organic monomers or oligomers with isocyanate groups, hydroxyl groups, amino groups, amide groups, carboxyl groups or acid anhydride groups at two ends to achieve the aim.
The loofah sponge is considered to be a continuous, flexible, net-like, three-dimensional plant fiber structure with polyhydroxy radicals on the surface.
The invention also comprises a preparation method of the fluorinated silica nanoparticle composite cucurbituril sponge VIP core material, and the technical scheme comprises the following steps:
step 1: continuously stirring the loofah sponge in 10% sodium hydroxide solution for 3 h. Washing the well-stirred retinervus Luffae fructus until pH value is neutral, and vacuum drying at 60 deg.C until mass is constant to obtain dried retinervus Luffae fructus. And finally, pressing and molding the dried loofah sponge.
Step 2: fluorinated silica nanoparticles were prepared using a sol-gel method. Ethanol and ammonia water are uniformly mixed at room temperature according to the mass ratio of 5:1, and then an equal amount of tetraethyl orthosilicate/ethanol (mass ratio of 1:5) solution is added. The resulting mixture was stirred vigorously at 30 ℃ for 3 h. Then, 1H,2H, 2H-perfluorodecyltrimethoxysilane was added thereto. After stirring continuously for 10h, the resulting milky suspension of F-SiO2 NPs was centrifuged at 9000rpm for 30min, the F-SiO2 NPs were collected and washed repeatedly with ethanol, and then dried under vacuum for 3 h.
And step 3: mixing the components in a mass ratio of 1: 30F-SiO 2 NPs and butyl acetate, and then treating the mixture under ultrasound. Then, the original loofah sponge, 1, 6-hexamethylene diisocyanate and dibutyl tin dilaurate (mass ratio 100:100:1) were added thereto, followed by stirring at 70 ℃ for 5 h. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. And finally, vacuum drying for 4h at 80 ℃ to obtain the fluorinated silica nanoparticle composite cucumaria frondosa sponge VIP core material.
Preferably, the mass ratio of the 1H,1H,2H, 2H-perfluorodecyltrimethoxysilane to the ammonia water in the step 2 is 1: 5.
Preferably, the mass ratio of the F-SiO2 NPs used in the step 3 to the loofah sponge is 1: 10.
compared with the prior art, the invention has the beneficial effects that:
the loofah sponge is a natural porous material, is a green environment-friendly material, has a continuous, flexible and reticular three-dimensional (3D) structure, and has a wide prospect in the field of heat preservation. The sponge loofah is convenient to obtain, and has a mature planting production chain in China. The fluorinated silica nano-particles are fixed on the surface of the loofah sponge, so that the super-hydrophobicity and the flame retardance can be obtained while the heat conductivity is reduced, and the characteristic of short service life of the loofah sponge is overcome. In a word, the novel fluorinated silica nanoparticle composite cucurbituril sponge VIP core material has wide application prospect in the technical field of heat insulation materials.
Drawings
FIG. 1 is a synthetic diagram of fluorinated silica nanoparticle modified loofah cotton fiber vacuum insulation panel core material.
Description of reference numerals: 10. loofah; 20. loofah sponge; 30. fluorinated silica nanoparticles, 40, 1, 6-hexamethylene diisocyanate; 50. fluorinated silicon dioxide nano-particles modified loofah cotton fiber vacuum insulation panel core material.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Detailed description of the preferred embodiment example 1
This example prepares a fluorinated silica nanoparticle composite cucurbituril sponge VIP core material. Taking 1, 6-hexamethylene diisocyanate as a connecting structure, and firmly anchoring fluorinated silica nanoparticles on the surface of sponge of loofah sponge by reacting isocyanate groups at two ends of the connecting structure with the fluorinated silica nanoparticles and hydroxyl groups on the surface of the sponge of loofah sponge to prepare the VIP core material. The preparation method comprises the following steps: preparing the loofah sponge. By a sol-gel method, ethanol and ammonia water are uniformly mixed at room temperature, and then tetraethyl orthosilicate/ethanol solution is added. The resulting mixture was stirred vigorously. Then, different amounts of 1H,1H,2H, 2H-perfluorodecyltrimethoxysilane were added thereto, and after continuous stirring, centrifugation, washing and vacuum drying, F-SiO2 NPs were obtained. F-SiO2 NPs and butyl acetate were mixed at room temperature and then subjected to ultrasonic treatment. Adding loofah sponge, 1, 6-hexamethylene diisocyanate and dibutyl tin dilaurate into loofah sponge in equal proportion and different quantities, stirring, repeatedly washing the loofah sponge with butyl acetate, and performing vacuum drying to obtain the fluorinated silicon dioxide nanoparticle composite loofah sponge VIP core material.
The preparation method of the fluorinated silica nanoparticle composite cucurbituril sponge VIP core material comprises the following specific steps:
(1) continuously stirring the loofah sponge in 10% sodium hydroxide solution for 3 h. Washing the well-stirred retinervus Luffae fructus until pH value is neutral, and vacuum drying at 60 deg.C until mass is constant to obtain dried retinervus Luffae fructus. And finally, pressing and molding the dried loofah sponge.
(2) Fluorinated silica nanoparticles were prepared using a sol-gel method. 250g of ethanol and 50g of ammonia water were mixed homogeneously at room temperature, and then 300g of tetraethylorthosilicate/ethanol (mass ratio 1:5) solution was added. The resulting mixture was stirred vigorously at 30 ℃ for 3 h. Then, 10g of 1H,1H,2H, 2H-perfluorodecyltrimethoxysilane was added thereto. After stirring continuously for 10h, the resulting milky suspension of F-SiO2 NPs was centrifuged at 9000rpm for 30min, the F-SiO2 NPs were collected and washed repeatedly with ethanol, and then dried under vacuum for 3 h.
(3) 10g of F-SiO2 NPs and 30g of butyl acetate were mixed at room temperature, and the mixture was then treated under ultrasound. Then, 100g of loofah sponge, 100g of 1, 6-hexamethylene diisocyanate and 1g of dibutyltin dilaurate were added thereto, followed by stirring at 70 ℃ for 5 hours. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. And finally, drying for 4 hours in vacuum at 80 ℃ to obtain the fluorinated silica nanoparticle composite cucumaria frondosa sponge VIP core material.
The thickness of the fluorinated silica nanoparticle composite loofah sponge VIP core material prepared in the embodiment is 0.55mm, the thermal conductivity is 0.025W/(m.K), and the initial thermal conductivity of the loofah sponge vacuum insulation panel is 0.0025W/(m.K).
The fluorinated silica nanoparticle composite sponge VIP core material can be further divided into the following examples:
detailed description of the preferred embodiments example 1.1
20g of F-SiO2 NPs and 60g of butyl acetate were mixed at room temperature and the mixture was then treated under ultrasound. Then, 100g of loofah sponge, 100g of 1, 6-hexamethylene diisocyanate and 1g of dibutyltin dilaurate were added thereto, followed by stirring at 70 ℃ for 5 hours. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. And finally, drying for 4 hours in vacuum at 80 ℃ to obtain the fluorinated silica nanoparticle composite cucumaria frondosa sponge VIP core material.
The thickness of the fluorinated silica nanoparticle composite loofah sponge VIP core material prepared in the embodiment is 0.55mm, the thermal conductivity is 0.024W/(m.K), and the initial thermal conductivity of the loofah sponge vacuum insulation panel is 0.0022W/(m.K).
Detailed description of the preferred embodiments example 1.2
5g of F-SiO2 NPs and 15g of butyl acetate were mixed at room temperature and the mixture was then treated under ultrasound. Then, 100g of loofah sponge, 100g of 1, 6-hexamethylene diisocyanate and 1g of dibutyltin dilaurate were added thereto, followed by stirring at 70 ℃ for 5 hours. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. Finally, vacuum drying for 4h at 80 ℃ to obtain the fluorinated silica nanoparticle composite cucurbituril sponge VIP core material
The thickness of the fluorinated silica nanoparticle composite loofah sponge VIP core material prepared in the embodiment is 0.55mm, the thermal conductivity is 0.025W/(m.K), and the initial thermal conductivity of the loofah sponge vacuum insulation panel is 0.0027W/(m.K).
Detailed description example 2
This example prepares a fluorinated silica nanoparticle composite cucurbituril sponge VIP core material. Taking 1, 6-hexamethylene diisocyanate as a connecting structure, and firmly anchoring fluorinated silica nanoparticles on the surface of sponge of loofah sponge by reacting isocyanate groups at two ends of the connecting structure with the fluorinated silica nanoparticles and hydroxyl groups on the surface of the sponge of loofah sponge to prepare the VIP core material. The preparation method comprises the following steps: preparing the loofah sponge. By a sol-gel method, ethanol and ammonia water are uniformly mixed at room temperature, and then tetraethyl orthosilicate/ethanol solution is added. The resulting mixture was stirred vigorously. Then, different amounts of 1H,1H,2H, 2H-perfluorodecyltrimethoxysilane were added thereto, and after continuous stirring, centrifugation, washing and vacuum drying, F-SiO2 NPs were obtained. F-SiO2 NPs and butyl acetate were mixed at room temperature and then subjected to ultrasonic treatment. Adding loofah sponge, 1, 6-hexamethylene diisocyanate and dibutyl tin dilaurate into loofah sponge in equal proportion and different quantities, stirring, repeatedly washing the loofah sponge with butyl acetate, and performing vacuum drying to obtain the fluorinated silicon dioxide nanoparticle composite loofah sponge VIP core material.
The preparation method of the fluorinated silica nanoparticle composite cucurbituril sponge VIP core material comprises the following specific steps:
(1) ) retinervus Luffae fructus was continuously stirred in 10% sodium hydroxide solution for 3 h. Washing the well-stirred retinervus Luffae fructus until pH value is neutral, and vacuum drying at 60 deg.C until mass is constant to obtain dried retinervus Luffae fructus. And finally, pressing and molding the dried loofah sponge.
(2) Fluorinated silica nanoparticles were prepared using a sol-gel method. 250g of ethanol and 50g of ammonia water were mixed homogeneously at room temperature, and then 300g of tetraethylorthosilicate/ethanol (mass ratio 1:5) solution was added. The resulting mixture was stirred vigorously at 30 ℃ for 3 h. Then, 20g of 1H,1H,2H, 2H-perfluorodecyltrimethoxysilane was added thereto. After stirring continuously for 10h, the resulting milky suspension of F-SiO2 NPs was centrifuged at 9000rpm for 30min, the F-SiO2 NPs were collected and washed repeatedly with ethanol, and then dried under vacuum for 3 h.
(3) 10g of F-SiO2 NPs and 30g of butyl acetate were mixed at room temperature, and the mixture was then treated under ultrasound. Then, 100g of loofah sponge, 100g of 1, 6-hexamethylene diisocyanate and 1g of dibutyltin dilaurate were added thereto, followed by stirring at 70 ℃ for 5 hours. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. And finally, drying for 4 hours in vacuum at 80 ℃ to obtain the fluorinated silica nanoparticle composite cucumaria frondosa sponge VIP core material.
The fluorinated silica nanoparticle composite sponge VIP core material can be further divided into the following examples:
the thickness of the fluorinated silica nanoparticle composite loofah sponge VIP core material prepared in the embodiment is 0.55mm, the thermal conductivity is 0.025W/(m.K), and the initial thermal conductivity of the loofah sponge vacuum insulation panel is 0.0025W/(m.K).
Detailed description example 2.1
20g of F-SiO2 NPs and 60g of butyl acetate were mixed at room temperature and the mixture was then treated under ultrasound. Then, 100g of loofah sponge, 100g of 1, 6-hexamethylene diisocyanate and 1g of dibutyltin dilaurate were added thereto, followed by stirring at 70 ℃ for 5 hours. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. And finally, drying for 4 hours in vacuum at 80 ℃ to obtain the fluorinated silica nanoparticle composite cucumaria frondosa sponge VIP core material.
The thickness of the fluorinated silica nanoparticle composite loofah sponge VIP core material prepared in the embodiment is 0.55mm, the thermal conductivity is 0.024W/(m.K), and the initial thermal conductivity of the loofah sponge vacuum insulation panel is 0.0022W/(m.K).
Detailed description example 2.2
5g of F-SiO2 NPs and 15g of butyl acetate were mixed at room temperature and the mixture was then treated under ultrasound. Then, 100g of loofah sponge, 100g of 1, 6-hexamethylene diisocyanate and 1g of dibutyltin dilaurate were added thereto, followed by stirring at 70 ℃ for 5 hours. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. And finally, drying for 4 hours in vacuum at 80 ℃ to obtain the fluorinated silica nanoparticle composite cucumaria frondosa sponge VIP core material.
The thickness of the fluorinated silica nanoparticle composite loofah sponge VIP core material prepared in the embodiment is 0.55mm, the thermal conductivity is 0.025W/(m.K), and the initial thermal conductivity of the loofah sponge vacuum insulation panel is 0.0028W/(m.K).
Detailed description example 3
This example prepares a fluorinated silica nanoparticle composite cucurbituril sponge VIP core material. Taking 1, 6-hexamethylene diisocyanate as a connecting structure, and firmly anchoring fluorinated silica nanoparticles on the surface of sponge of loofah sponge by reacting isocyanate groups at two ends of the connecting structure with the fluorinated silica nanoparticles and hydroxyl groups on the surface of the sponge of loofah sponge to prepare the VIP core material. The preparation method comprises the following steps: preparing the loofah sponge. By a sol-gel method, ethanol and ammonia water are uniformly mixed at room temperature, and then tetraethyl orthosilicate/ethanol solution is added. The resulting mixture was stirred vigorously. Then, different amounts of 1H,1H,2H, 2H-perfluorodecyltrimethoxysilane were added thereto, and after continuous stirring, centrifugation, washing and vacuum drying, F-SiO2 NPs were obtained. F-SiO2 NPs and butyl acetate were mixed at room temperature and then subjected to ultrasonic treatment. Adding loofah sponge, 1, 6-hexamethylene diisocyanate and dibutyl tin dilaurate into loofah sponge in equal proportion and different quantities, stirring, repeatedly washing the loofah sponge with butyl acetate, and performing vacuum drying to obtain the fluorinated silicon dioxide nanoparticle composite loofah sponge VIP core material.
The preparation method of the fluorinated silica nanoparticle composite cucurbituril sponge VIP core material comprises the following specific steps:
(1) ) retinervus Luffae fructus was continuously stirred in 10% sodium hydroxide solution for 3 h. Washing the well-stirred retinervus Luffae fructus until pH value is neutral, and vacuum drying at 60 deg.C until mass is constant to obtain dried retinervus Luffae fructus. And finally, pressing and molding the dried loofah sponge.
(2) Fluorinated silica nanoparticles were prepared using a sol-gel method. 250g of ethanol and 50g of ammonia water were mixed homogeneously at room temperature, and then 300g of tetraethylorthosilicate/ethanol (mass ratio 1:5) solution was added. The resulting mixture was stirred vigorously at 30 ℃ for 3 h. Then, the resulting milky suspension of SiO2 NPs was centrifuged at 9000rpm for 30min, and SiO2 NPs were collected and washed repeatedly with ethanol, followed by vacuum drying for 3 h.
(3) 10g of SiO2 NPs and 30g of butyl acetate were mixed at room temperature, and the mixture was then treated under ultrasound. Then, 100g of loofah sponge, 100g of 1, 6-hexamethylene diisocyanate and 1g of dibutyltin dilaurate were added thereto, followed by stirring at 70 ℃ for 5 hours. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. And finally, drying for 4 hours at 80 ℃ in vacuum to obtain the silicon dioxide nanoparticle composite cucumaria sponge VIP core material.
The thickness of the fluorinated silica nanoparticle composite loofah sponge VIP core material prepared in the embodiment is 0.55mm, the thermal conductivity is 0.025W/(m.K), and the initial thermal conductivity of the loofah sponge vacuum insulation panel is 0.0023W/(m.K).
The silicon dioxide nanoparticle composite sponge VIP core material can be divided into the following embodiments:
detailed description example 3.1
20g of SiO2 NPs and 60g of butyl acetate were mixed at room temperature, and the mixture was then treated under ultrasound. Then, 100g of loofah sponge, 100g of 1, 6-hexamethylene diisocyanate and 1g of dibutyltin dilaurate were added thereto, followed by stirring at 70 ℃ for 5 hours. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. And finally, drying for 4 hours at 80 ℃ in vacuum to obtain the silicon dioxide nanoparticle composite cucumaria sponge VIP core material.
The thickness of the fluorinated silica nanoparticle composite loofah sponge VIP core material prepared in the embodiment is 0.55mm, the thermal conductivity is 0.024W/(m.K), and the initial thermal conductivity of the loofah sponge vacuum insulation panel is 0.0022W/(m.K).
Detailed description example 3.2
5g of SiO2 NPs and 15g of butyl acetate were mixed at room temperature, and the mixture was then treated under ultrasound. Then, 100g of loofah sponge, 100g of 1, 6-hexamethylene diisocyanate and 1g of dibutyltin dilaurate were added thereto, followed by stirring at 70 ℃ for 5 hours. Thereafter, the loofah sponge was repeatedly washed with butyl acetate. And finally, drying for 4 hours at 80 ℃ in vacuum to obtain the silicon dioxide nanoparticle composite cucumaria sponge VIP core material.
The thickness of the fluorinated silica nanoparticle composite loofah sponge VIP core material prepared by the embodiment is 0.55mm, the thermal conductivity is 0.026W/(m.K), and the initial thermal conductivity of the loofah sponge vacuum insulation panel is 0.0025W/(m.K).
The above steps are not very different for the similar examples, so the comparison of the results obtained in the similar examples is easy. It is not intended to be limited thereby to the practice of the invention with other components and mass numbers.
Claims (5)
1. A fluorinated silica nanoparticle modified loofah cotton fiber vacuum insulation panel core material is characterized in that: the composite VIP core material is composed of loofah sponge with a three-dimensional plant fiber structure and fluorinated silica nanoparticles with a zero-dimensional inorganic structure, and the linking mode is that isocyanate groups at two ends of 1, 6-hexamethylene diisocyanate react with hydroxyl groups on the surfaces of the two to form firm chemical bonds, so that the fluorinated silica nanoparticles are anchored on the surface of the loofah sponge.
2. The method for preparing the fluorinated silica nanoparticle modified loofah cotton fiber vacuum insulation panel core material according to claim 1, comprising the following steps:
(1) continuously stirring the loofah sponge in a sodium hydroxide solution with the concentration of 10% for 3 hours, and washing the loofah sponge after being fully stirred until the pH value is neutral; vacuum drying at 60 deg.C until the mass is constant to obtain dried retinervus Luffae fructus, and press-molding;
(2) preparing fluorinated silica nanoparticles by using a sol-gel method, uniformly mixing ethanol and ammonia water at room temperature according to a mass ratio of 5:1, and then adding an equivalent tetraethyl orthosilicate/ethanol solution with a mass ratio of 1: 5; the mixture obtained is stirred vigorously at 30 ℃ for 3 h; 1H,1H,2H, 2H-perfluorodecyl trimethoxy silane is added into the mixture and continuously stirred for 10 hours; centrifuging the obtained F-SiO2 NPs milky suspension for 30min at the rotating speed of 9000rpm, and collecting F-SiO2 NPs; repeatedly washing with ethanol, and vacuum drying for 3 hr;
(3) at room temperature, the mass ratio of 1: 30 mixing F-SiO2 NPs and butyl acetate, and then treating the mixture under ultrasonic waves; adding original loofah sponge, 1, 6-hexamethylene diisocyanate and dibutyl tin dilaurate in a mass ratio of 100:100:1, and stirring at 70 ℃ for 5 hours; repeatedly washing the loofah sponge by using butyl acetate; and finally, vacuum drying for 4h at 80 ℃ to obtain the fluorinated silica nanoparticle composite cucumaria frondosa sponge VIP core material.
3. The method for preparing the fluorinated silica nanoparticle modified loofah cotton fiber vacuum insulation panel core material as claimed in claim 2, wherein the mass ratio of 1H,1H,2H, 2H-perfluorodecyltrimethoxysilane to the ammonia water used in the step 2 is 0: 5-2: 5.
4. The method for preparing the fluorinated silica nanoparticle modified loofah sponge fiber vacuum insulation panel core material as claimed in claim 2, wherein the mass ratio of the F-SiO2 NPs and the loofah sponge used in the step 3 is 1: 20-1: 5.
5. The method for preparing the fluorinated silica nanoparticle-modified loofah sponge fiber vacuum insulation panel core material according to claim 2, wherein in the step 3, 1, 6-hexamethylene diisocyanate having isocyanate groups at both ends is used as an organic monomer to anchor the fluorinated silica nanoparticles on the surface of the loofah sponge, and other organic monomers or oligomers having isocyanate groups, hydroxyl groups, amino groups, amide groups, carboxyl groups or anhydride groups at both ends are substituted.
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