CN112480456A - Aerogel-containing phase change film and preparation method and application method thereof - Google Patents
Aerogel-containing phase change film and preparation method and application method thereof Download PDFInfo
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- CN112480456A CN112480456A CN202011523595.0A CN202011523595A CN112480456A CN 112480456 A CN112480456 A CN 112480456A CN 202011523595 A CN202011523595 A CN 202011523595A CN 112480456 A CN112480456 A CN 112480456A
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Abstract
The invention discloses a phase change film containing aerogel, a preparation method and an application method thereof, wherein the phase change film comprises a three-layer structure, the upper layer and the lower layer are heat conduction sealing layers, the middle layer is an aerogel phase change layer, the thickness of the upper layer and the lower layer is 5-20 micrometers, the thickness of the aerogel phase change layer of the middle layer is 50-300 micrometers, the upper layer and the lower layer are heat conduction sealing layers and are composed of resin and filler, the resin is polyurethane, acrylic acid, organic silicon, epoxy and other resin, the filler is silicon oxide, silicon nitride, boron nitride, aluminum oxide and other heat conduction inorganic fillers, the aerogel phase change layer of the middle layer is composed of polytetrafluoroethylene, silicon oxide aerogel and phase change materials, the phase change materials are paraffin, polyvinyl alcohol and the like, the silicon oxide aerogel is hydrophobic silicon oxide aerogel powder, the particle size is 10-100 micrometers, and the mass ratio of the silicon oxide aerogel. The invention can be applied to 3C products such as mobile phones, smart watches and the like.
Description
Technical Field
The invention relates to the field of nano materials, in particular to a phase change film containing aerogel and a preparation method and an application method thereof.
Background
Phase change materials are widely used in the fields of thermal insulation, energy storage and thermal management. With the development of information technology, the application of microwave radio frequency and 5G technology, the heat productivity of electronic products is getting larger and larger. When the electronic product is at the peak power, the product performance is reduced due to active frequency reduction caused by overhigh temperature. The phase-change material is adopted to store the instantaneously generated heat and then slowly release the heat to play a role in eliminating the peak of the heat, thereby effectively reducing the frequency reduction phenomenon of the electronic product caused by too high instantaneous power.
The silica aerogel is composed of 1-100nm silica particles, has a porosity of 89-99.8%, is in a gel state when being compounded with a liquid phase system due to the fact that all pores are through holes, and is convenient to use, so that the aerogel is a good composite material with the liquid phase system. When the pores of the aerogel are filled with electrolyte, the aerogel has high ionic conductivity and can be applied to gel electrolyte of a semi-solid battery; when the pores of the aerogel are filled with the liquid silver ion bactericide, the long-acting fruit bactericidal gel can be formed; when the pores of the aerogel are filled with liquid paraffin, a gel phase-change material with high enthalpy can be formed. The prior art adopts aerogels such as graphene and aramid fiber to be mixed with paraffin to form aerogel phase change materials, the two aerogel materials are complex in process and are not suitable for industrialization at present, the silica aerogel is an industrialized product at present, the prior art adopts the silica aerogel, the paraffin and resin such as acrylic acid to be compounded to form a composite phase change film, but the phase change film prepared by the process has poor thermal conductivity, the paraffin volatilizes in a molten state, volatilized components can influence the stability of an electronic product, and in addition, the conventional polyurethane, the resin such as acrylic acid and the like are mixed with the aerogel, so that resin coated powder is easily caused, and the pore volume in the aerogel can not be effectively utilized.
Disclosure of Invention
The invention mainly aims to provide a phase-change film containing aerogel, a preparation method and an application method thereof, which can effectively solve the problems in the background art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a phase change membrane that contains aerogel, the phase change membrane includes three layer construction, and upper and lower layer is the heat conduction sealing layer, and the intermediate level is aerogel phase transition layer, upper and lower layer heat conduction sealing layer comprises resin and filler, and the resin is resin such as polyurethane, acrylic acid, organosilicon, epoxy, and the filler comprises heat conduction inorganic filler such as silicon oxide, silicon nitride, boron nitride, aluminium oxide, intermediate level aerogel phase transition layer comprises polytetrafluoroethylene, silicon oxide aerogel and phase change material, and phase change material is paraffin, polyvinyl alcohol etc. and the silicon oxide aerogel is hydrophobic silicon oxide aerogel powder.
Preferably, the heat conductivity of the upper and lower heat conduction sealing layers is 1-8 W.m/K.
Preferably, the mass of the silica aerogel in the intermediate layer aerogel phase change layer accounts for 2-20%, the particle size is 10-100 microns, and the phase change enthalpy of the intermediate layer aerogel phase change layer is 100-190J/g.
Preferably, the thickness of the upper and lower heat-conducting sealing layers is 5-20 microns, and the thickness of the middle aerogel phase-change layer is 50-300 microns.
A preparation method of a phase-change film containing aerogel comprises the following operation steps:
s1: mixing the polytetrafluoroethylene emulsion and the silica aerogel to form a paste, rolling to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50-300 microns, and drying;
s2: soaking the composite sheet of polytetrafluoroethylene and silica aerogel into the phase-change material solution, keeping for 0.1-10h, ensuring that the phase-change material completely permeates into the holes of the aerogel, and preparing an aerogel phase-change layer;
s3: preparing resin and filler into a heat conduction sealing solution, immersing the aerogel phase change layer into the heat conduction sealing solution, adopting a dipping process, and drying and curing to finally obtain the aerogel phase change film with a three-layer structure.
Preferably, the mass ratio of the polytetrafluoroethylene emulsion to the silica aerogel is 20-60% and 40-80%, respectively, and the phase-change material is paraffin or polyvinyl alcohol.
Preferably, the resin is one or more of polyurethane, acrylic, silicone, epoxy and the like, and the filler is one or more of silicon oxide, silicon nitride, boron nitride, aluminum oxide and the like.
Use of an aerogel-containing phase change film, the method of use comprising:
a1: the composite heat insulation film is applied to the field of intelligent watches, the aerogel phase change film is compounded with the heat insulation film and is attached to the back of the electronic watch, so that the scald of high temperature to human skin is relieved;
a2: the aerogel phase change film is compounded with the heat conduction film and attached to the surface of a CPU (central processing unit) to smooth a heat peak value and reduce the frequency reduction frequency caused by overhigh instantaneous temperature in the field of smart phones.
Compared with the prior art, the invention has the following beneficial effects:
the composite aerogel sheet prepared by adopting polytetrafluoroethylene and aerogel through a rolling mode has high porosity, all the inner parts are through holes, and the composite aerogel sheet can be conveniently immersed into a liquid phase-change material at the later stage. One layer of heat conduction sealing layer is formed on two sides of the phase change material, so that the heat conduction performance of the aerogel phase change film is improved, and meanwhile, the volatilization of paraffin is also prevented, and the safety and the stability of the aerogel phase change film in the electronic product are ensured.
Drawings
FIG. 1 is a schematic structural diagram of a phase change film of the present invention;
fig. 2 is a schematic view of the structure of the electronic watch to which the present invention is applied;
fig. 3 is a schematic structural diagram of the present invention applied to a smart phone.
FIG. 4 is a flow chart of a manufacturing process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious 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:
as shown in figure 1, the invention relates to a phase change film containing aerogel, which comprises a three-layer structure, wherein the upper layer and the lower layer are heat-conducting sealing layers, the middle layer is an aerogel phase change layer, the thickness of the upper layer and the lower layer is 5-20 micrometers, the thickness of the aerogel phase change layer of the middle layer is 50-300 micrometers, the upper layer and the lower layer are heat-conducting sealing layers and are composed of resin and filler, the resin is polyurethane, acrylic acid, organic silicon, epoxy and other resins, the filler is silicon oxide, silicon nitride, boron nitride, aluminum oxide and other heat-conducting inorganic fillers, the aerogel phase change layer of the middle layer is composed of polytetrafluoroethylene, silicon oxide aerogel and phase change materials, the phase change materials are paraffin, polyvinyl alcohol and the like, the silicon oxide aerogel is hydrophobic silicon oxide aerogel powder, the upper layer and the lower layer are heat-conducting sealing layers, the heat conductivity is 1-8 W.m/K, the, the grain size is 10-100 microns, the phase change enthalpy of the aerogel phase change layer in the middle layer is 100-190J/g, the thickness of the heat conduction sealing layer on the upper layer and the lower layer is 5-20 microns, and the thickness of the aerogel phase change layer in the middle layer is 50-300 microns.
As shown in fig. 4, a method for preparing a phase-change film containing aerogel, the method for preparing the phase-change film comprising the following steps:
s1: mixing the polytetrafluoroethylene emulsion and the silica aerogel to form a paste, rolling to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50-300 microns, drying, wherein the mass ratio of the polytetrafluoroethylene emulsion to the silica aerogel is 20-60% and 40-80%, respectively, when the polytetrafluoroethylene emulsion and the hydrophobic silica aerogel powder are mixed, the polytetrafluoroethylene emulsion and the hydrophobic silica aerogel powder need to be dispersed at high speed to be uniformly mixed, because the aerogel powder is hydrophobic powder, the aerogel powder is not easy to mix with the polytetrafluoroethylene emulsion, and organic solvents which are mutually melted with water such as alcohols and the like can be added to accelerate mixing, the organic solvents can cause the pore volume of the aerogel to be reduced in the drying process, therefore, auxiliary agents such as a surfactant and the like can be added to assist in mixing, the thickness of the aerogel phase change layer is completely determined by the rolling gap and can be freely adjusted between 50 and 300 microns;
s2: soaking a composite sheet of polytetrafluoroethylene and silica aerogel in a phase change material solution, keeping for 0.1-10h to ensure that the phase change material completely permeates into holes of the aerogel to prepare a gas condensation phase change layer, wherein the phase change material is paraffin or polyvinyl alcohol and the like, the resin is one or more of polyurethane, acrylic acid, organic silicon, epoxy and the like, soaking the composite sheet of polytetrafluoroethylene and silica aerogel in the phase change solution, performing dip-binding treatment, the process has high requirements on the strength of the composite sheet of polytetrafluoroethylene and silica aerogel, and the conventional resins such as polyacrylic acid, polyester and the like are difficult to realize high aerogel content and have high strength, meanwhile, all holes in the composite material are through holes, so that the liquid phase-change material can enter all aerogel holes, and the polytetrafluoroethylene composite process can more easily realize the through holes and high aerogel content;
s3: preparing resin and filler into a heat conduction sealing solution, immersing the aerogel phase change layer into the heat conduction sealing solution, adopting a dipping process, drying and curing to finally obtain the aerogel phase change film with a three-layer structure, wherein the filler is one or more of silicon oxide, silicon nitride, boron nitride, aluminum oxide and the like.
2-3, the application method of the aerogel-containing phase-change film comprises the following steps:
a1: the intelligent watch is applied to the field of intelligent watches, the aerogel phase-change film and the heat insulation film are compounded and attached to the back of the electronic watch, so that the scald of high temperature to human skin is relieved, one side of the intelligent watch is directly attached to the skin of a user, the temperature of the attached skin side is not too high, the back shell of the intelligent watch is attached with the heat insulation layer, the heat insulation layer is attached with the aerogel phase-change film and then attached to an electronic device of the intelligent watch, and therefore the temperature of the back of the intelligent watch can be effectively reduced;
a2: application in the smart mobile phone field, aerogel phase change membrane is compound with the heat conduction membrane, paste on the CPU surface, smooth heat peak value, reduce the number of times of falling the frequency because of instantaneous temperature is too high, the smart mobile phone is when peak power, CPU can produce a large amount of heat, hardly dispel fast through the heat dissipation, consequently can lead to temperature rise in the twinkling of an eye, thereby trigger the protection of falling the frequency, if absorb the heat through aerogel phase change membrane this moment, with the temperature rise in the twinkling of an eye that slowly subtracts, treat peak power decline back, lead away this part heat again, can realize the smooth effect of temperature rise, also reduce simultaneously and trigger CPU and fall the frequency of frequencies, consequently, this application needs good coefficient of heat conductivity, need to paste in the CPU surface after aerogel phase change membrane and heat conduction membrane are compound.
Example 2:
on the basis of example 1, a method for preparing an aerogel comprising comprises the following operating steps:
s1: dispersing and mixing 10g of polytetrafluoroethylene emulsion and 40g of silica aerogel at 3000 revolutions for 1 hour to form a paste, calendering by adopting a calender at the temperature of 50 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50 microns, and drying in air at the temperature of 50 ℃;
s2: soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in a paraffin solution at the temperature of 80 ℃, keeping for 2 hours, and ensuring that the phase change material is completely permeated into the holes of the aerogel to prepare an aerogel phase change layer;
s3: firstly, 20g of PU resin and 50g of boron nitride powder are dispersed and mixed by 1000 turns to prepare a heat-conducting sealing solution, the aerogel phase change layer is immersed in the heat-conducting sealing solution, the dipping process is adopted, the speed of 0.5 meter per minute is increased, and the drying and curing are carried out at 80 ℃, so that the PU heat-conducting sealing aerogel phase change film with a three-layer structure is finally obtained.
Example 3:
on the basis of example 1, a method for preparing an aerogel comprising comprises the following operating steps:
s1: dispersing and mixing 10g of polytetrafluoroethylene emulsion and 40g of silica aerogel at 3000 revolutions for 1 hour to form a paste, calendering by adopting a calender at the temperature of 60 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50 microns, and drying in air at the temperature of 60 ℃;
s2: soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in a paraffin solution at the temperature of 80 ℃, keeping for 2 hours, and ensuring that the phase change material is completely permeated into the holes of the aerogel to prepare an aerogel phase change layer;
s3: firstly, 20g of PU resin and 50g of alumina powder are dispersed and mixed by 1000 turns to prepare a heat-conducting sealing solution, the aerogel phase change layer is immersed in the heat-conducting sealing solution, the dipping process is adopted, the speed of 0.5 meter per minute is increased, and the drying and curing are carried out at 80 ℃, so that the PU heat-conducting sealing aerogel phase change film with a three-layer structure is finally obtained.
Example 4:
on the basis of example 1, a method for preparing an aerogel comprising comprises the following operating steps:
s1: dispersing and mixing 10g of polytetrafluoroethylene emulsion and 40g of silica aerogel at 3000 revolutions for 1 hour to form a paste, calendering by adopting a calender at the temperature of 70 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50 microns, and drying in air at the temperature of 70 ℃;
s2: soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in a paraffin solution at the temperature of 80 ℃, keeping for 2 hours, and ensuring that the phase change material is completely permeated into the holes of the aerogel to prepare an aerogel phase change layer;
s3: firstly, 20g of PU resin and 50g of silicon oxide powder are dispersed and mixed by 1000 turns to prepare a heat-conducting sealing solution, the aerogel phase change layer is immersed in the heat-conducting sealing solution, the dipping process is adopted, the speed of 0.5 meter per minute is increased, and the drying and curing are carried out at 80 ℃, so that the PU heat-conducting sealing aerogel phase change film with a three-layer structure is finally obtained.
Example 5:
on the basis of example 1, a method for preparing an aerogel comprising comprises the following operating steps:
s1: dispersing and mixing 10g of polytetrafluoroethylene emulsion and 40g of silica aerogel at 3000 revolutions for 1 hour to form a paste, calendering by adopting a calender at the temperature of 80 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 100 microns, and drying in air at the temperature of 80 ℃;
s2: soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in a paraffin solution at 90 ℃, keeping for 2 hours, and ensuring that the phase-change material is completely permeated into the holes of the aerogel to prepare an aerogel phase-change layer;
s3: firstly, 20g of PU resin, 30g of alumina powder and 40g of silicon nitride powder are dispersed and mixed by 1000 turns to prepare a heat-conducting sealing solution, the aerogel phase change layer is immersed in the heat-conducting sealing solution, the dipping process is adopted, the speed of 0.5 meter per minute is increased, the drying and curing are carried out at 80 ℃, and finally the PU heat-conducting sealing aerogel phase change film with a three-layer structure is obtained.
Example 6:
on the basis of example 1, a method for preparing an aerogel comprising comprises the following operating steps:
s1: dispersing and mixing 10g of polytetrafluoroethylene emulsion and 20g of silica aerogel at 3000 revolutions for 1 hour to form a paste, calendering by adopting a calender at the temperature of 50 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50 microns, and drying in air at the temperature of 70 ℃;
s2: soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in a paraffin solution at the temperature of 60 ℃, keeping for 2 hours, and ensuring that the phase-change material is completely permeated into the holes of the aerogel to prepare an aerogel phase-change layer;
s3: firstly, 20g of organic silicon resin and 50g of silicon nitride powder are dispersed and mixed by 1000 turns to prepare a heat conduction sealing solution, the aerogel phase change layer is immersed in the heat conduction sealing solution, the dipping process is adopted, the speed of 1 meter per minute is increased, and the three-layer structure organic silicon heat conduction sealing aerogel phase change film is obtained after drying and curing at 80 ℃.
Example 7:
on the basis of example 1, a method for preparing an aerogel comprising comprises the following operating steps:
s1: dispersing and mixing 10g of polytetrafluoroethylene emulsion and 20g of silica aerogel at 3000 revolutions for 1 hour to form a paste, calendering by adopting a calender at the temperature of 50 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50 microns, and drying in air at the temperature of 70 ℃;
s2: soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in a paraffin solution at the temperature of 80 ℃, keeping for 2 hours, and ensuring that the phase change material is completely permeated into the holes of the aerogel to prepare an aerogel phase change layer;
s3: firstly, dispersing and mixing 20g of acrylic resin and 50g of silicon nitride powder by 1000 turns to prepare a heat-conducting sealing solution, immersing the aerogel phase change layer into the heat-conducting sealing solution, adopting a dipping process, increasing the speed by 0.2 meter per minute, and drying and curing at 80 ℃ to finally obtain the acrylic resin heat-conducting sealing aerogel phase change film with a three-layer structure.
Example 8:
on the basis of example 1, a method for preparing an aerogel comprising comprises the following operating steps:
s1: dispersing and mixing 10g of polytetrafluoroethylene emulsion and 10g of silica aerogel at 3000 revolutions for 1 hour to form a paste, calendering by adopting a calender at the temperature of 50 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50 microns, and drying in air at the temperature of 70 ℃;
s2: soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in a paraffin solution at the temperature of 80 ℃, keeping for 2 hours, and ensuring that the phase change material is completely permeated into the holes of the aerogel to prepare an aerogel phase change layer;
s3: firstly, 20g of organic silicon resin and 50g of silicon nitride powder are dispersed and mixed by 1000 turns to prepare a heat conduction sealing solution, the aerogel phase change layer is immersed in the heat conduction sealing solution, the dipping process is adopted, the speed of 0.5 meter per minute is increased, the drying and curing are carried out at 70 ℃, and finally the PU heat conduction sealing aerogel phase change film with the three-layer structure is obtained.
Example 9:
on the basis of example 1, a method for preparing an aerogel comprising comprises the following operating steps:
s1: dispersing and mixing 10g of polytetrafluoroethylene emulsion and 50g of silica aerogel at 2000 rpm for 0.5h to form a paste, calendering by adopting a calender at 50 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50 microns, and drying in 70 ℃ air;
s2: soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in a paraffin solution at the temperature of 80 ℃, keeping for 2 hours, and ensuring that the phase change material is completely permeated into the holes of the aerogel to prepare an aerogel phase change layer;
s3: firstly, 20g of organic silicon resin and 50g of silicon nitride powder are dispersed and mixed by 1000 turns to prepare a heat conduction sealing solution, the aerogel phase change layer is immersed in the heat conduction sealing solution, the dipping process is adopted, the speed of 0.5 meter per minute is increased, and the drying and curing are carried out at 100 ℃, so that the PU heat conduction sealing aerogel phase change film with a three-layer structure is finally obtained.
Example 10:
on the basis of example 1, a method for preparing an aerogel comprising comprises the following operating steps:
s1: dispersing and mixing 10g of polytetrafluoroethylene emulsion and 50g of silica aerogel at 3000 revolutions for 0.5h to form a paste, calendering by adopting a calender at the temperature of 50 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 300 microns, and drying in air at the temperature of 70 ℃;
s2: soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in 60-degree polyvinyl alcohol solution, keeping for 2 hours, and ensuring that the phase change material is completely permeated into the holes of the aerogel to prepare an aerogel phase change layer;
s3: firstly, 20g of organic silicon resin and 50g of silicon nitride powder are dispersed and mixed by 1000 turns to prepare a heat conduction sealing solution, the aerogel phase change layer is immersed in the heat conduction sealing solution, the dipping process is adopted, the speed of 0.5 meter per minute is increased, and the drying and curing are carried out at 80 ℃, so that the PU heat conduction sealing aerogel phase change film with a three-layer structure is finally obtained.
Experimental data sheet
| Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | Example 9 | Example 10 | |
| Thermal conductivity (W.m/K) | 6.1 | 3.4 | 1.6 | 8.2 | 5.8 | 6.1 | 5.7 | 6.0 | 5.8 |
| Enthalpy of phase change (J/g) | 195 | 193 | 196 | 187 | 140 | 135 | 85 | 60 | 93 |
| Film thickness (micron) | 70 | 70 | 70 | 140 | 70 | 70 | 70 | 70 | 340 |
Comparative group 1
S1, dispersing and mixing 10g of polytetrafluoroethylene emulsion and 40g of silica aerogel at 3000 rpm for 1h to form a paste, rolling by a rolling mill at 50 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50 microns, and drying in 70 ℃ air.
And S2, soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in 80-degree paraffin solution, keeping for 2 hours, and ensuring that the phase change material completely penetrates into the holes of the aerogel to obtain a single-layer aerogel phase change film with the thickness of 50 microns.
Comparative group 2
S1, dispersing and mixing 10g of polytetrafluoroethylene emulsion and 40g of silica aerogel at 3000 rpm for 1h to form a paste, rolling by a rolling mill at 50 ℃ to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50 microns, and drying in 70 ℃ air.
And S2, soaking the polytetrafluoroethylene and silicon oxide aerogel sheet prepared in the step S1 in 80-degree paraffin solution, keeping for 2 hours, and ensuring that the phase change material completely penetrates into the holes of the aerogel to obtain a single-layer aerogel phase change film with the thickness of 50 microns.
S3, firstly, dispersing and mixing 20g of PU resin and 50g of boron nitride powder by 1000 turns to prepare a heat conduction sealing solution, immersing the aerogel phase change layer into the heat conduction sealing solution, adopting an immersion process, increasing the speed by 0.5 meter per minute, and drying and curing at 80 ℃ to finally obtain the PU heat conduction sealing aerogel phase change film with the three-layer structure.
In comparison between the comparative group 1 and the comparative group 2, the comparative group 1 only performs the steps S1 and S2, but not the step S3, so that the obtained phase change film is a single-layer film without upper and lower heat-conductive sealing layers. Comparative group 2 was operated as per the normal procedure. The phase change films of comparative group 1 and comparative group 2 were placed in an oven at 80 degrees and heat treated for 48 hours, and the mass loss ratio was obtained for the treated mass loss/original mass. The comparative group data show that the three-layer structure aerogel phase change film in the patent has obvious improvement on the mass loss ratio and the thermal conductivity
| Comparative example 1 | Comparative example 2 | |
| Mass loss ratio (%) | 0.3 | 0.001 |
| Thermal conductivity (W.m/K) | 0.8 | 6.1 |
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. An aerogel-containing phase change film, comprising: the phase change film comprises a three-layer structure, wherein the upper layer and the lower layer are heat conduction sealing layers, the middle layer is an aerogel phase change layer, the upper layer and the lower layer are composed of resin and filler, the resin is polyurethane, acrylic acid, organic silicon, epoxy and the like, the filler is silicon oxide, silicon nitride, boron nitride, aluminum oxide and other heat conduction inorganic fillers, the middle layer aerogel phase change layer is composed of polytetrafluoroethylene, silicon oxide aerogel and phase change materials, the phase change materials are paraffin, polyvinyl alcohol and the like, and the silicon oxide aerogel is hydrophobic silicon oxide aerogel powder.
2. The aerogel-containing phase change film of claim 1, wherein: the heat conductivity of the upper and lower heat-conducting sealing layers is 1-8 W.m/K.
3. The aerogel-containing phase change film of claim 1, wherein: the mass of the silica aerogel in the intermediate layer aerogel phase change layer accounts for 2-20%, the particle size is 10-100 microns, and the phase change enthalpy of the intermediate layer aerogel phase change layer is 100-190J/g.
4. The aerogel-containing phase change film of claim 1, wherein: the thickness of the upper and lower heat-conducting sealing layers is 5-20 microns, and the thickness of the middle aerogel phase change layer is 50-300 microns.
5. A preparation method of a phase-change film containing aerogel is characterized by comprising the following steps: the preparation method of the phase-change film comprises the following operation steps:
s1: mixing the polytetrafluoroethylene emulsion and the silica aerogel to form a paste, rolling to prepare a sheet of polytetrafluoroethylene and silica aerogel with the thickness of 50-300 microns, and drying;
s2: soaking the composite sheet of polytetrafluoroethylene and silica aerogel into the phase-change material solution, keeping for 0.1-10h, ensuring that the phase-change material completely permeates into the holes of the aerogel, and preparing an aerogel phase-change layer;
s3: preparing resin and filler into a heat conduction sealing solution, immersing the aerogel phase change layer into the heat conduction sealing solution, adopting a dipping process, and drying and curing to finally obtain the aerogel phase change film with a three-layer structure.
6. The method of claim 5, wherein the step of preparing the aerogel-containing phase change film comprises: the mass ratio of the polytetrafluoroethylene emulsion to the silica aerogel is 20-60% and 40-80%, respectively, and the phase-change material is paraffin or polyvinyl alcohol.
7. The method of claim 5, wherein the step of preparing the aerogel-containing phase change film comprises: the resin is one or more of polyurethane, acrylic acid, organic silicon, epoxy and the like, and the filler is one or more of silicon oxide, silicon nitride, boron nitride, aluminum oxide and the like.
8. Use of an aerogel-containing phase change film, wherein: the application method comprises the following steps:
a1: the composite heat insulation film is applied to the field of intelligent watches, the aerogel phase change film is compounded with the heat insulation film and is attached to the back of the electronic watch, so that the scald of high temperature to human skin is relieved;
a2: the aerogel phase change film is compounded with the heat conduction film and attached to the surface of a CPU (central processing unit) to smooth a heat peak value and reduce the frequency reduction frequency caused by overhigh instantaneous temperature in the field of smart phones.
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