CN112876202B - Melamine foam reinforced silicon dioxide aerogel composite material and application thereof - Google Patents

Melamine foam reinforced silicon dioxide aerogel composite material and application thereof Download PDF

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CN112876202B
CN112876202B CN202110152093.XA CN202110152093A CN112876202B CN 112876202 B CN112876202 B CN 112876202B CN 202110152093 A CN202110152093 A CN 202110152093A CN 112876202 B CN112876202 B CN 112876202B
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melamine foam
shell body
protective shell
composite material
aerogel composite
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CN112876202A (en
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樊雪子
李洋洋
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Fengte Zhejiang New Material Co ltd
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Fengte Zhejiang New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B30/00—Compositions for artificial stone, not containing binders
    • C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
    • 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
    • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
    • C01B33/157—After-treatment of gels
    • C01B33/158—Purification; Drying; Dehydrating
    • C01B33/1585—Dehydration into aerogels
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/06—Quartz; Sand
    • C04B14/064—Silica aerogel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The invention provides a melamine foam reinforced silicon dioxide aerogel composite material and application thereof, wherein the material is prepared from 90-95 wt% of SiO 2 Aerogel and 5% -10% of melamine foam, and the preparation method specifically comprises the following steps: adding a hydrochloric acid alcohol solution into methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water, adjusting the pH value, and performing hydrolysis reaction to obtain a silica sol system; adding mannitol into a silica sol system, stirring uniformly, adding an ammonia water alcohol solution to adjust the pH value, stirring to fully mix the solution, pouring into a mold containing melamine foam, immersing the melamine foam, standing and aging to obtain SiO2 gel-foam composite foam; and (5) replacing a solvent, and performing supercritical drying to obtain the product. According to the invention, the silica sol is directly soaked in the melamine foam fiber, and the melamine foam fiber is subjected to gel aging, modification and drying together to obtain the aerogel composite material, which has a lower heat conductivity coefficient, higher mechanical stability and better consistency of product quality.

Description

Melamine foam reinforced silicon dioxide aerogel composite material and application thereof
Technical Field
The invention belongs to the technical field of aerogel materials, and particularly relates to a melamine foam reinforced silicon dioxide aerogel composite material and application thereof.
Background
Aerogel is a special kind of nanoporous material with many excellent physicochemical properties, such as: low density, high porosity, high specific surface area, adjustable surface chemistry, etc. Since the aerogel has unique properties in the aspects of physics, chemistry, machinery and the like, the aerogel is widely applied in the fields of heat preservation and insulation, catalysis, environmental purification, chemical sensors, acoustic sensors, energy storage equipment, waterproof coatings, inertial confinement fusion, high-energy physics, particle capture, biomedicine, food processing and the like.
Aerogels are mainly classified into inorganic aerogels, organic aerogels and carbon aerogels. The inorganic aerogel mainly includes a salicide aerogel and a metal oxide aerogel. Silica aerogels were the earliest and most studied aerogels, and are currently the most widely used aerogels in a variety of applications. Typical silica aerogels have unique properties of high specific surface area, high porosity, high optical transmittance, low density, and ultra-low thermal conductivity. But the application of the method is limited to a great extent due to the main defects of brittleness, non-toughness and easy fracture generation during pressing. The modified silica aerogel formed by polymer crosslinking belongs to an organic-inorganic hybrid material and can be improved by introducing a proper amount of polymer into a sol system. The heat-insulating material has unique properties in the aspects of mechanics, acoustics, thermology, optics and the like, the most outstanding heat-insulating property is heat-insulating property, and the heat-insulating material has wide application prospect in the fields of aerospace, petrochemical industry, electric metallurgy, ships and vehicles, precision instruments, refrigerator cold storages, clothing tents, building energy conservation and the like due to the unique property, and is a revolutionary substitute product of the traditional heat-insulating material. Along with the economic transformation and upgrade of China, the policy of energy saving and consumption reduction is continuously and vigorously promoted, and China implements a nano material strategy for many years.
At present, most of silica aerogel felts take glass fibers or other fibers as carriers, and although the problems of brittleness, non-toughness and easy fracture during pressing of the aerogel are solved, the problem of large volume weight exists, and the application range is limited.
Disclosure of Invention
The invention provides a melamine foam reinforced silica aerogel composite material and application thereof, and solves the problem that the existing silica aerogel felt is large in volume weight.
The technical scheme of the invention is realized as follows:
a melamine foam reinforced silicon dioxide aerogel composite material is prepared from 90-95 wt% of SiO 2 Aerogel and 5% -10% of melamine foam, and the preparation method specifically comprises the following steps:
(1) Adding a hydrochloric acid alcohol solution into methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water, adjusting the pH value of the solution to 2-3, and violently stirring at room temperature to perform hydrolysis reaction for 4-6 hours to obtain a silica sol system;
(2) Adding mannitol into a silica sol system, stirring uniformly, adding an ammonia water alcohol solution, adjusting the pH value to 7.5-8.5, stirring to fully mix the solution, stopping stirring after 5min, pouring into a mold containing melamine foam, immersing the melamine foam, standing and aging for 24-36 h under the closed condition of 40-55 ℃ to obtain SiO2 gel-foam composite foam;
(3) The solvent replacement is carried out by adopting acetone, and after the replacement is finished, CO is added 2 And performing supercritical drying in the environment to obtain the low-density aerogel/melamine foam composite material.
Wherein, preferably, the molar ratio of methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water in the step (1) is 1: (0.5-1.0): (10-20): (8-12): (0.005-0.015).
Wherein, preferably, the mol ratio of the mannitol to the methyltrimethoxysilane in the step (2) is (0.1-0.3): 1.
wherein, the number of times of solvent replacement in the step (3) is preferably 3-6 times, and each replacement time is 12-24 hours.
An application of a melamine foam reinforced silicon dioxide aerogel composite material in a power battery.
Preferably, the battery comprises a protective shell body, the interior of the protective shell body is in a cavity shape and used for loading the power battery, and the top of the protective shell body is connected with a sealing cover;
the fixed mounting frames are respectively connected to two sides of the bottom of the protective shell body and are used for connecting the protective shell body with the electric vehicle;
the protective heat absorption pad is connected to the inner wall of the protective shell body, the protective heat absorption pad is made of a melamine foam reinforced silicon dioxide aerogel composite material and used for absorbing heat and preserving heat of the power battery shell, and a melamine foam combination is filled in an adhesive of the protective heat absorption pad and the protective shell;
the shock absorption protection piece is connected to the bottom of the protection shell body and used for slowing down shaking of the fixed mounting frame and the protection shell body.
Wherein, preferably, shock attenuation protection part is including being the fixed mounting seat of just connecting in the protecting crust body bottom, and fixed mounting seat bottom is connected with the telescopic link, and the telescopic link bottom is connected with the contact steady piece, damping spring has been cup jointed to the telescopic link output, damping spring one end is connected with the contact steady piece, and the damping spring other end and telescopic link outer wall connection, the horizontal shock attenuation piece that reduces the horizontal vibrations of protecting crust body has been cup jointed to the telescopic link output.
Wherein, preferably, horizontal shock attenuation piece is including cup jointing the connecting plate in the telescopic link output outside, and is connected with first articulated seat on the connecting plate, it has the slurcam to articulate on the first articulated seat, protective housing body bottom is equipped with four sliding trays, and sliding tray inside sliding connection has a sliding block, sliding block one side is connected with the reset spring who is connected with the sliding tray lateral wall, the sliding block bottom is connected with the articulated seat of second, and the articulated seat of second is articulated with the slurcam other end.
Wherein, preferably, the sliding block is I-shaped.
Wherein, preferably, the bottom of the contact stabilizing block is a hollow cone.
The invention has the beneficial effects that:
according to the invention, sodium citrate is added into silica sol, and chemical crosslinking of the silica sol is increased, so that the purpose of strengthening a gel structure is achieved. The mannitol is added in the gel aging step, so that the growth of gel particles can be inhibited, the size uniformity of gel network gaps is facilitated, the strength of a gel framework is increased, and the shrinkage and cracking of the gel caused by non-uniform stress in the subsequent drying process are avoided.
The invention directly soaks the melamine foam fiber with the silica sol, and the gel aging, the modification and the drying are carried out together until the production of the product is finished. The aerogel composite material obtained by the method has the advantages that the aerogel is a continuous phase, the foam fiber is a dispersed phase, the thermal conductivity coefficient is low, the mechanical stability is high, and the consistency of the product quality is good. The composite material disclosed by the invention has the characteristics of softness, easiness in cutting, small density, fire prevention, flame retardance, green environmental protection and the like, and can replace traditional flexible thermal insulation materials which are not environment-friendly and have poor thermal insulation performance, such as glass fiber products, asbestos thermal insulation felts, silicate fiber products and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
Figure 1 is a stress-strain plot of the melamine foam reinforced silica aerogel composite of example 1.
FIG. 2 is a schematic view of the overall structure of the present invention;
FIG. 3 is a schematic bottom view of the present invention;
FIG. 4 is a schematic view of the protective shell after the cover is removed;
FIG. 5 is a schematic structural view of the protective shell body after the power battery is taken out;
FIG. 6 is a schematic view of the structure of the lateral shock absorbing member of the present invention;
fig. 7 is a partial sectional structure view of fig. 5.
In the figure: 1-a protective shell body; 2-sealing the cover; 3-fixing the mounting rack; 4-protective heat absorption pad; 5-shock absorbing guards; 6-fixing the mounting seat; 7, a telescopic rod; 8-contact stabilization block; 9-a damping spring; 10-transverse shock absorbing members; 11-a connecting plate; 12-a first articulated seat; 13-a push plate; 14-a sliding groove; 15-a slider; 16-a return spring; 17-a second articulated seat.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
EXAMPLE 1
The present embodiment providesA melamine foam reinforced silica aerogel composite material is prepared from 93 wt% of SiO 2 Aerogel and 7% melamine foam, the preparation method specifically comprises the following steps:
(1) Adding a hydrochloric acid alcohol solution into methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water, adjusting the pH value of the solution to 2.5, and violently stirring at room temperature to perform hydrolysis reaction for 5 hours to obtain a silica sol system; the mol ratio of the methyltrimethoxysilane to the sodium citrate to the absolute ethyl alcohol to the deionized water is 1:0.8:15:10:0.010;
(2) Adding mannitol into silica sol system, stirring, adding ammonia water alcohol solution to adjust pH to 8.0, stirring to mix the solution thoroughly, stopping stirring after 5min, pouring into a mold containing melamine foam, immersing melamine foam, standing and aging at 50 deg.C under sealed condition for 30 hr to obtain SiO 2 Gel-foam syntactic foams; the molar ratio of mannitol to methyltrimethoxysilane was 0.2:1;
(3) The solvent replacement is carried out by adopting acetone, the replacement frequency is 4 times, each replacement time is 18 hours, and CO is generated after the replacement is finished 2 And performing supercritical drying under the environment to obtain the low-density aerogel/melamine foam composite material.
The low density aerogel/melamine foam composite of this example was tested for performance.
Specific surface area and porosity: measured by an automatic adsorption instrument, and N is used for adsorbing gas 2 The temperature was 77K and the specific surface area was calculated by the BET method.
And (3) testing mechanical properties: a dynamic mechanical analyzer is adopted to carry out mechanical performance test, firstly, the composite material is processed into a regular cylinder shape, the size of the cylinder shape is measured, a certain mould is used for fixing a sample, the constant temperature treatment is carried out for 5min at 25 ℃, and then the compression is carried out by the force of 1N/min until the pressure reaches 18N.
And (3) testing the density: the density of the aerogel sample was calculated using the formula p = m/V.
Coefficient of thermal conductivity: the test was carried out using GB/T3399, where the cold plate temperature was 5 ℃ and the hot plate temperature was 20 ℃.
Test knotFruit: specific surface area 454.5m 2 Per g, porosity of 90%, density of 9.8mg/cm 3 The thermal conductivity is 22.34mw/mk, the compressive strength is about 0.45MPa (25% deformation), and the stress-strain curve of the composite material of the embodiment is shown in fig. 1.
EXAMPLE 2
This example provides a melamine foam reinforced silica aerogel composite material, which is prepared from 90 wt% of SiO 2 Aerogel and 10% melamine foam, the preparation method specifically comprises the following steps:
(1) Adding a hydrochloric acid alcohol solution into methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water, adjusting the pH value of the solution to 2, and violently stirring at room temperature to perform hydrolysis reaction for 6 hours to obtain a silica sol system; the mol ratio of the methyltrimethoxysilane to the sodium citrate to the absolute ethyl alcohol to the deionized water is 1:0.5:20:8:0.015;
(2) Adding mannitol into a silica sol system, stirring uniformly, adding an ammonia water alcohol solution, adjusting the pH value to 7.5, stirring to fully mix the solution, stopping stirring after 5min, pouring into a mold containing melamine foam, immersing the melamine foam, standing and aging for 24h under a sealed condition at 55 ℃ to obtain SiO2 gel-foam composite foam; the molar ratio of mannitol to methyltrimethoxysilane was 0.3:1;
(3) The solvent replacement is carried out by adopting acetone, the replacement frequency is 3 times, the replacement time is 24 hours each time, and CO is generated after the replacement is finished 2 And performing supercritical drying under the environment to obtain the low-density aerogel/melamine foam composite material.
Results of performance testing (same test method as in example 1): specific surface area 452.1.5m 2 A porosity of 91.2%, a density of 9.6mg/cm 3 The thermal conductivity coefficient is 22.38mw/mk, and the compressive strength is about 0.46MPa (25% deformation).
EXAMPLE 3
The embodiment provides a melamine foam reinforced silica aerogel composite material, which is prepared from 95 wt% of SiO 2 Aerogel and 5% melamine foam, the preparation method specifically comprises the following steps:
(1) Adding a hydrochloric acid alcohol solution into methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water, adjusting the pH value of the solution to 3, and violently stirring at room temperature to perform hydrolysis reaction for 4 hours to obtain a silica sol system; the mol ratio of the methyltrimethoxysilane to the sodium citrate to the absolute ethyl alcohol to the deionized water is 1:1.0:10:12:0.005;
(2) Adding mannitol into silica sol system, stirring, adding ammonia water alcohol solution, adjusting pH to 7.5, stirring to mix the solution thoroughly, stopping stirring after 5min, pouring into a mold containing melamine foam, immersing melamine foam, standing under 55 deg.C sealed condition, aging for 24 hr to obtain SiO 2 Gel-foam syntactic foams; the molar ratio of mannitol to methyltrimethoxysilane was 0.3:1;
(3) The solvent replacement is carried out by adopting acetone, the replacement frequency is 6 times, the replacement time is 12 hours each time, and CO is generated after the replacement is finished 2 And performing supercritical drying under the environment to obtain the low-density aerogel/melamine foam composite material.
Results of performance testing (same test method as in example 1): specific surface area 452.8m 2 Per g, porosity 90.1%, density 8.6mg/cm 3 The thermal conductivity coefficient is 22.65mw/mk, and the compressive strength is about 0.42MPa (25% deformation).
EXAMPLE 4
The embodiment provides a melamine foam reinforced silica aerogel composite material, which is prepared from 90-95 wt% of SiO 2 Aerogel and 5% -10% of melamine foam, and the preparation method specifically comprises the following steps:
(1) Adding a hydrochloric acid alcohol solution into methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water, adjusting the pH value of the solution to 2, and violently stirring at room temperature to carry out hydrolysis reaction for 5 hours to obtain a silica sol system; the mol ratio of the methyltrimethoxysilane to the sodium citrate to the absolute ethyl alcohol to the deionized water is 1:0.6:18:9:0.012;
(2) Adding mannitol into silica sol system, stirring, adding ammonia water alcohol solution to adjust pH to 8.2, stirring to mix the solution thoroughly, stopping after 5minStirring, pouring into a mold containing melamine foam, immersing melamine foam, standing and aging at 45 deg.C under sealed condition for 28 hr to obtain SiO 2 Gel-foam syntactic foams; the molar ratio of mannitol to methyltrimethoxysilane was 0.15:1;
(3) The solvent replacement is carried out by adopting acetone, the replacement frequency is 4 times, each replacement time is 18 hours, and CO is generated after the replacement is finished 2 And performing supercritical drying under the environment to obtain the low-density aerogel/melamine foam composite material.
Results of performance testing (same test method as in example 1): specific surface area 452.1m 2 Per g, porosity of 90.4%, density of 9.5mg/cm 3 The thermal conductivity coefficient is 22.16mw/mk, and the compressive strength is about 0.43MPa (25% deformation).
EXAMPLE 5
This example provides a melamine foam reinforced silica aerogel composite material, which is formed from 94% by weight of SiO 2 Aerogel and 6% melamine foam, the preparation method specifically comprises the following steps:
(1) Adding a hydrochloric acid alcohol solution into methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water, adjusting the pH value of the solution to 3, and violently stirring at room temperature to perform hydrolysis reaction for 5 hours to obtain a silica sol system; the mol ratio of the methyltrimethoxysilane to the sodium citrate to the absolute ethyl alcohol to the deionized water is 1:0.9:12:11:0.008;
(2) Adding mannitol into silica sol system, stirring, adding ammonia water alcohol solution to adjust pH to 7.8, stirring to mix the solution thoroughly, stopping stirring after 5min, pouring into a mold containing melamine foam, immersing melamine foam, standing and aging at 50 deg.C under sealed condition for 32 hr to obtain SiO 2 Gel-foam syntactic foams; the molar ratio of mannitol to methyltrimethoxysilane was 0.25:1;
(3) The solvent replacement is carried out by adopting acetone, the replacement frequency is 5 times, each replacement time is 16 hours, and CO is generated after the replacement is finished 2 And performing supercritical drying under the environment to obtain the low-density aerogel/melamine foam composite material.
Performance ofTest results (test method same as example 1): specific surface area 461.5m 2 A porosity of 92% and a density of 9mg/cm 3 The thermal conductivity coefficient is 21.34mw/mk, and the compressive strength is about 0.35MPa (25% deformation).
Example 6
This example provides a melamine foam reinforced silica aerogel composite material comprising 93 wt% SiO 2 Aerogel and 7% melamine foam, the method of preparation of this example being the same as example 1 except that no sodium citrate was added in step (1).
Results of performance testing (same test method as in example 1): specific surface area 453.9m 2 Per g, porosity 89.6%, density 9.9mg/cm 3 The thermal conductivity coefficient is 22.35mw/mk, and the compressive strength is about 0.36MPa (25% deformation).
Example 7
This example provides a melamine foam reinforced silica aerogel composite material, which is prepared from 93 wt% of SiO 2 Aerogel and 7% melamine foam, the method of preparation of this example being the same as example 1 except that no propylene glycol was added in step (2).
Results of performance testing (same test method as in example 1): specific surface area 455.1m 2 Per g, porosity of 90.1%, density of 9.8mg/cm 3 The thermal conductivity coefficient is 22.21mw/mk, and the compressive strength is about 0.37MPa (25% deformation).
Application examples
As shown in fig. 2-7, this embodiment provides an application of melamine foam reinforcing silica aerogel composite in power battery, and it is not hard up to have the thermal-insulated effect of shock attenuation to solved current electric motor car in-process of traveling because jolting and lead to protecting shell body 1 and electric automobile body junction to appear, thereby make vibrations between power battery and the protecting shell body 1 in this scheme, and the design in this scheme includes: the protective shell comprises a protective shell body 1, wherein the interior of the protective shell body 1 is in a cavity shape and used for loading a power battery, a socket connected with an external electric wire is formed in the outer side of the protective shell body 1 in the scheme, and chamfering processing is performed on four corners of the protective shell body 1 respectively, so that the protective shell body 1 can be conveniently placed into an electric vehicle body, the protective shell body 1 can be conveniently protected, two pulling ropes for pulling the protective shell body 1 are fixedly connected to two side walls of the protective shell body 1 respectively, the protective shell body 1 can be conveniently installed and disassembled, and the top of the protective shell body 1 is connected with a sealing cover 2; the two fixed mounting frames 3 are respectively connected to two sides of the bottom of the protective shell body 1, and the fixed mounting frames 3 are used for connecting the protective shell body 1 with the electric vehicle; the protection heat absorption pad 4 is connected to the inner wall of the protection shell body 1, the protection heat absorption pad 4 is made of a melamine foam reinforced silicon dioxide aerogel composite material and used for absorbing heat and preserving heat of the power battery shell, and a filling material in an adhesive of the protection heat absorption pad 4 and the protection shell body 1 is a melamine foam combination; and the shock absorption protection piece 5 is connected to the bottom of the protective shell body 1 to reduce the shaking of the fixed mounting frame 3 and the protective shell body 1.
In this scheme of practicality will during protecting shell body 1, place protecting shell body 1 inside the cavity of electric motor car installation battery, carry out fixed mounting with fixed connection at the fixed mounting bracket 3 and the electric motor car cavity department of protecting shell body 1 bottom simultaneously, because shock attenuation protection piece 5 fixed connection is in protecting shell body 1 bottom, after protecting shell body 1 installation, shock attenuation protection piece 5 just installs the cavity position department at protecting shell body 1 and automobile body this moment, place power battery inside protecting shell body 1 this moment, when the electric motor car goes on jolting the road, protecting shell body 1 is not hard up the back this moment, because shock attenuation protection piece 5 one end and protecting shell body 1 fixed connection, and shock attenuation protection piece 5 other end and automobile body cavity contact, under the condition of the vertical shock attenuation of shock attenuation protection piece 5 and horizontal shock attenuation, be convenient for slow down rocking of protecting shell body 1, reduce and rock the wearing and tearing of in-process battery and protecting shell body 1, simultaneously because the protection heat absorption pad 4 has all laminated on four inside lateral walls of protecting shell body 1, further rock the heat that the in-process produced and slow down.
Shock attenuation protection piece 5 is including being the fixed mounting seat 6 of just connecting in the 1 bottom of protecting crust body, and 6 bottoms of fixed mounting seat are connected with telescopic link 7, and 7 bottoms of telescopic link are connected with the steady piece 8 of contact, 8 bottoms of the steady piece of contact are the hollow cone, damping spring 9 has been cup jointed to 7 output ends of telescopic link, damping spring 9 one end is connected with the steady piece 8 of contact, and the damping spring 9 other end and 7 outer wall connections of telescopic link, 7 output ends of telescopic link have cup jointed the horizontal shock attenuation 10 that reduces the horizontal vibrations of protecting crust body 1. Horizontal bumper shock absorber 10 is including cup jointing connecting plate 11 in the 7 output outside of telescopic link, and is connected with first articulated seat 12 on connecting plate 11, it has slurcam 13 to articulate on the first articulated seat 12, 1 bottom of protecting crust body is equipped with four sliding chutes 14, and the inside sliding connection of sliding chute 14 has sliding block 15, sliding block 15 is the I shape, sliding block 15 one side is connected with reset spring 16 who is connected with the 14 lateral walls of sliding chute, sliding block 15 bottom is connected with the articulated seat 17 of second, and the articulated seat 17 of second is articulated with slurcam 13 other end.
The working principle of the scheme is as follows: after the protective shell body 1 is placed at the battery installation cavity of the electric vehicle, the fixed mounting frame 3 fixedly connected to the protective shell body 1 is fixedly connected to the electric vehicle body, the power battery is installed inside the protective shell body 1, when the electric vehicle runs on a bumpy road, the bolt connected between the electric vehicle cavity and the protective shell body 1 is loosened due to shaking of the electric vehicle, the protective shell body 1 starts to slide along the bolt direction, the fixed mounting seat 6 is fixedly connected to the bottom position of the protective shell body 1, when the protective shell body 1 moves downwards, the telescopic rod 7 fixedly connected to the bottom of the fixed mounting seat 6 starts to extrude the damping spring 9, meanwhile, the bottom of the telescopic rod 7 is fixedly connected with the contact stabilizing block 8 with the hollow conical bottom, so that the contact stabilizing block 8 is conveniently stabilized at the position of the vehicle body, and under the damping reset of the damping spring 9, the telescopic link 7 begins to kick-back, simultaneously because connecting plate 11 has been cup jointed at the 7 output of telescopic link, and the first articulated seat 12 of fixedly connected with on the connecting plate 11 and articulated at first articulated seat 12 department have a catch plate 13, in damping spring 9 buffering shock attenuation, it is articulated the rotation to drive catch plate 13 in step, simultaneously because the catch plate 13 other end is articulated with the articulated seat 17 of second, and then promote sliding block 15 along sliding tray 14 motion, thereby make sliding block 15 extrude reset spring 16, under reset spring 16 resets the buffering, be convenient for promote catch plate 13 and carry out secondary shock attenuation buffering, through buffering the shock attenuation many times, reduce the vibrations that the electric motor car installation cavity arouses protective shell body 1, will and reduce and install the rocking of installing at the inside power battery of protective shell body 1, simultaneously be convenient for absorb the heat that the friction of power battery produced at protective shell body 1 inside protection heat absorption pad 4 of installing inside protective shell body 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. A melamine foam reinforced silicon dioxide aerogel composite material is characterized by comprising 90-95 wt% of SiO 2 Aerogel and 5% -10% of melamine foam, and the preparation method specifically comprises the following steps:
(1) Adding a hydrochloric acid alcohol solution into methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water, adjusting the pH value of the solution to 2-3, and violently stirring at room temperature to perform hydrolysis reaction for 4-6 hours to obtain a silica sol system;
(2) Adding mannitol into a silica sol system, stirring uniformly, adding an ammonia water alcohol solution, adjusting the pH value to 7.5-8.5, stirring to fully mix the solution, stopping stirring after 5min, pouring into a mold containing melamine foam, immersing the melamine foam, standing and aging for 24-36 h under the sealed condition of 40-55 ℃ to obtain SiO 2 Gel-foam syntactic foams;
(3) The solvent replacement is carried out by adopting acetone, and CO is added after the replacement is finished 2 Performing supercritical drying in the environment to obtain the low-density aerogel/melamine foam composite material;
the mol ratio of the mannitol to the methyltrimethoxysilane in the step (2) is (0.1-0.3): 1.
2. a melamine foam reinforced silica aerogel composite according to claim 1, wherein: the number of times of solvent replacement in the step (3) is 3-6 times, and the replacement time is 12-24 hours each time.
3. Use of a melamine foam reinforced silica aerogel composite as claimed in any one of claims 1 to 2 in a power cell, wherein:
the battery comprises a protective shell body, the interior of the protective shell body is in a cavity shape and used for loading the power battery, and the top of the protective shell body is connected with a sealing cover; the two fixed mounting frames are respectively connected to two sides of the bottom of the protective shell body and are used for connecting the protective shell body with the electric vehicle; the protective heat absorption pad is connected to the inner wall of the protective shell body, the protective heat absorption pad is made of a melamine foam reinforced silicon dioxide aerogel composite material and used for absorbing heat and preserving heat of the power battery shell, and a melamine foam combination is filled in an adhesive of the protective heat absorption pad and the protective shell; the shock absorption protection piece is connected to the bottom of the protective shell body and used for slowing down the shaking of the fixed mounting frame and the protective shell body;
the shock absorption protection part comprises a fixed mounting seat connected to the bottom of the protection shell body, the bottom of the fixed mounting seat is connected with a telescopic rod, the bottom of the telescopic rod is connected with a contact stabilizing block, the output end of the telescopic rod is sleeved with a shock absorption spring, one end of the shock absorption spring is connected with the contact stabilizing block, the other end of the shock absorption spring is connected with the outer wall of the telescopic rod, and the output end of the telescopic rod is sleeved with a transverse shock absorption part for reducing transverse shock of the protection shell body;
the horizontal shock attenuation piece is including cup jointing the connecting plate in the telescopic link output outside, and is connected with first articulated seat on the connecting plate, it has the slurcam to articulate on the first articulated seat, protective housing body bottom is equipped with four sliding trays, and the inside sliding connection of sliding tray has the sliding block, sliding block one side is connected with the reset spring who is connected with the sliding tray lateral wall, the sliding block bottom is connected with the articulated seat of second, and the articulated seat of second is articulated with the slurcam other end.
4. Use of a melamine foam reinforced silica aerogel composite according to claim 3 in a power cell, characterized in that: the sliding block is I-shaped.
5. Use of a melamine foam reinforced silica aerogel composite according to claim 4 in a power cell, characterized in that: the bottom of the contact stabilizing block is a hollow cone.
CN202110152093.XA 2021-02-03 2021-02-03 Melamine foam reinforced silicon dioxide aerogel composite material and application thereof Active CN112876202B (en)

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