CN106928904A - A kind of phase-change material and preparation method thereof and a kind of construction material - Google Patents
A kind of phase-change material and preparation method thereof and a kind of construction material Download PDFInfo
- Publication number
- CN106928904A CN106928904A CN201710134312.5A CN201710134312A CN106928904A CN 106928904 A CN106928904 A CN 106928904A CN 201710134312 A CN201710134312 A CN 201710134312A CN 106928904 A CN106928904 A CN 106928904A
- Authority
- CN
- China
- Prior art keywords
- phase
- change material
- formamide
- expanded graphite
- acetate trihydrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0071—Phase-change materials, e.g. latent heat storage materials used in concrete compositions
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The present invention relates to phase-change material technical field, more particularly to a kind of phase-change material and preparation method thereof and a kind of construction material.The phase-change material includes Sodium acetate trihydrate, formamide and enhanced thermal conduction agent；With respect to Sodium acetate trihydrate, formamide is no more than 40wt%, and enhanced thermal conduction agent is 3 10wt%；The enhanced thermal conduction agent is carbon-based material.Wherein, enhanced thermal conduction agent is used to improve the thermal conductivity factor of the phase-change material, and formamide is used to reduce the phase transition temperature of the phase-change material.
Description
Technical field
The present invention relates to phase-change material technical field, more particularly to a kind of phase-change material and preparation method thereof and a kind of build
Material.
Background technology
The energy is the mainstay of national development, as the high speed development of modern industry and the rapid of people's living standard are carried
Height, the demand of the energy is growing.But energy supply and demand have stronger time dependence, cause the lance for supplying with needing
Shield increasingly intensifies, i.e., the peak of supply network, paddy load difference are further widened, and this seriously reduces efficiency of energy utilization.Cause
This, peak load shifting is carried out using effective means, peak-trough electricity utilization rate is improved, as study hotspot instantly.
Accumulation of heat or cold-storage are carried out network load is at a low ebb using energy-storage system, in the energy that power surges period will be stored
Amount is discharged to be used, and is one of important means of balance power network imbalance between supply and demand.On the one hand can so improve energy profit
With efficiency, alleviate the contradiction of peak valley charge difference；On the other hand electric power peak valley price difference can be utilized, its economic feasibility is improved.
Energy-accumulating medium in energy-storage system, along with the change of state of matter, therefore is also claimed during the storing of energy
It is phase-change material.Sodium acetate trihydrate is a kind of common phase-change material.However, heat and three water vinegar that Sodium acetate trihydrate is passed out
Ratio between the heat that sour sodium absorbs is relatively low, i.e. the thermal efficiency of this phase-change material of Sodium acetate trihydrate is not high enough, causes energy storage
System is not good enough to the utilization rate of heat.The fusing point of Sodium acetate trihydrate is higher, causes it not to be suitable for being run in normal temperature environment
Energy-storage system.Additionally, the constancy of Sodium acetate trihydrate has to be reinforced.
The content of the invention
The invention provides a kind of phase-change material and the method for preparing phase-change material, for solving three water vinegar in the prior art
The thermal efficiency of sour this phase-change material of sodium is not high enough, the problem that fusing point is higher and mobility is larger.
According to an aspect of the present invention, there is provided a kind of phase-change material, including Sodium acetate trihydrate, formamide and enhanced thermal conduction
Agent；With respect to Sodium acetate trihydrate, formamide is no more than 40wt%, and enhanced thermal conduction agent is 3-10wt%；The enhanced thermal conduction agent is
Carbon-based material.Wherein, enhanced thermal conduction agent is used to improve the thermal conductivity factor of Sodium acetate trihydrate, and formamide is used to reduce Sodium acetate trihydrate
Phase transition temperature.
Alternatively, the carbon-based material is expanded graphite or carbon fiber.
Alternatively, the phase-change material also include nucleator, thickener in one or two.The nucleator is used to subtract
The degree of supercooling of the small phase-change material, the thickener is separated for suppressing the phase-change material.
Alternatively, the nucleator is selected from sodium tetraborate, sodium metasilicate, sodium pyrophosphate, silica, crystalline hydrogen two
Sodium, the thickener is selected from hydroxymethyl cellulose, polyvinyl alcohol, sucrose, polyacrylamide, gum arabic.And relative three water
Sodium acetate, nucleator is that, less than 3wt%, thickener is 1-2wt%.
Preferably, phase-change material of the invention include Sodium acetate trihydrate, formamide, enhanced thermal conduction agent, nucleator and
Thickener；And relative Sodium acetate trihydrate, formamide is 25wt%, and enhanced thermal conduction agent is 3-8wt%, and nucleator is 2wt%, thickening
Agent is 2wt%.
It is highly preferred that phase-change material of the invention includes Sodium acetate trihydrate, formamide, expanded graphite, crystalline
Disodium hydrogen and polyvinyl alcohol；And relative Sodium acetate trihydrate, formamide is 25wt%, and expanded graphite is 3-8wt%, crystalline hydrogen
Disodium is 2wt%, and polyvinyl alcohol is 2wt%.
According to another aspect of the present invention, there is provided a kind of method for preparing phase-change material of the invention, including：
Step 1：The raw material for preparing phase-change material are weighed according to corresponding mass fraction, the raw material include phase transformation base
Body material Sodium acetate trihydrate, fusing point modifying agent formamide and enhanced thermal conduction agent, can also include nucleator and thickener；
Step 2：The mixture that raw material in addition to enhanced thermal conduction agent are formed is heated, until melting；
Step 3：By enhanced thermal conduction agent add melt mixture in and stir, obtain the phase-change material.
According to another aspect of the present invention, a kind of construction material is additionally provided, the construction material is included according to the present invention
Phase-change material.
Beneficial effects of the present invention are：
Method of the phase-change material that the present invention is provided with phase-change material is prepared, adds during phase-change material is prepared
Enhanced thermal conduction agent and fusing point modifying agent, so as to improve the thermal efficiency and the utilization rate to heat of phase-change material, reduce phase transformation
The phase transition temperature of material, and the constancy of phase-change material is enhanced, it is allowed to the energy-storage system suitable for being run normal temperature environment.
Brief description of the drawings
Fig. 1 be bath temperature be 43 DEG C when, the heat accumulation experiments curve map of phase-change material；
Fig. 2 be bath temperature be 31 DEG C when, the cooling curve figure of phase-change material；
Fig. 3 is under different quality containing expanded graphite, the SEM of phase-change material schemes；
Fig. 4 is under different quality containing expanded graphite, the POM of phase-change material schemes；
Fig. 5 be different quality containing expanded graphite under, the thermal conductivity factor figure of phase-change material；
Fig. 6 be different quality containing expanded graphite under, the XRD spectra of phase-change material；
Fig. 7 be different quality containing expanded graphite under, the FTIR spectrograms of phase-change material.
Specific embodiment
Specific embodiment is only the description of the invention, without constituting the limitation to present invention, below in conjunction with
Specific embodiment is further described and describes to the present invention.
According to an aspect of the present invention, there is provided a kind of phase-change material, including phase transformation matrix material Sodium acetate trihydrate, formyl
Amine and enhanced thermal conduction agent；With respect to Sodium acetate trihydrate, formamide is no more than 40wt%, and enhanced thermal conduction agent is 3-10wt%；It is described
Enhanced thermal conduction agent is carbon-based material.Wherein, enhanced thermal conduction agent is used to improve the thermal conductivity factor of the phase-change material, and formamide is used for
Reduce the phase transition temperature of the phase-change material.
Sodium acetate trihydrate CH3COONa·3H2O is a kind of common energy storage material, its fusing point (alternatively referred to as phase transition temperature)
It is 58 DEG C, possesses latent heat of phase change higher, chemical stability is good and cheap and easy to get.Certain embodiment of the present invention can also be used
Other phase transformation matrix materials, the embodiment of the present invention is without limitation.Acetate trihydrate is hereafter included with phase transformation matrix material
As a example by sodium.
Because the phase transition temperature of Sodium acetate trihydrate is higher, the energy storage system for causing it not to be suitable for being run in normal temperature environment
System, therefore phase-change material can be prepared using Sodium acetate trihydrate and fusing point modifying agent are compound, to reduce the fusing point of phase-change material, make
Obtain this phase-change material and go for normal temperature environment.
In possible implementation method, can select to meet the material of following condition as fusing point modifying agent：With phase transformation base
Body material does not chemically react, and can with phase transformation matrix material formed eutectic point mixture, will fusing point modifying agent with
Phase transition temperature can be reduced after phase transformation matrix material molten.
A kind of fusing point modifying agents such as choose formamide.Formamide has the advantages that cheap and easy to get and stable chemical nature.
Melting can form eutectic after formamide is mixed with Sodium acetate trihydrate, and when the mass fraction scope of formamide is 20%
When~30%, the phase transition temperature of mixture can be reduced to 40 DEG C or so from 58.98 DEG C, and with latent heat of phase change higher.Its
In, the mass fraction of formamide refers to the quality and the ratio of the quality of Sodium acetate trihydrate of formamide, is represented with percentage.When
So, in addition to formamide, other materials can also be chosen as fusing point modifying agent, the embodiment of the present invention is to fusing point modifying agent
Species is not limited.
In specific implementation process, the mass fraction of formamide may range from no more than 40%.Preferably, formamide is worked as
When mass fraction in raw material is 25%, with latent heat of phase change (242.1kJkg higher-1), and phase-change material phase
Temperature is 41.77 DEG C, ideal, so mass fraction of the formamide in raw material is preferably 25%, as shown in table 1.
Under the formamide of the different quality containing of table 1, the DSC data of Sodium acetate trihydrate/formamide
Also there is a problem of that the thermal efficiency is not high enough due to Sodium acetate trihydrate, so can also be added in Sodium acetate trihydrate leading
Hot reinforcing agent, to improve the thermal conductivity factor and heat-transfer effect of phase-change material.Enhanced thermal conduction agent can choose thermal conductivity factor higher than pre-
If threshold value, and there is no chemical reaction or the material for seldom being chemically reacted with phase transformation matrix material with phase transformation matrix material.
Wherein, predetermined threshold value for example can be 90Wm-1·K-1.Value and enhanced thermal conduction agent of the embodiment of the present invention to predetermined threshold value
Species be not limited.
In possible implementation method, due to carbon-based material, such as carbon fiber or expanded graphite, all with high heat conduction system
Number, wherein, the thermal conductivity factor of carbon fiber is 1000Wm-1·K-1, the thermal conductivity factor of expanded graphite is 100Wm-1·K-1, plus
Upper carbon-based material is with low cost, it is possible to choose carbon-based material as enhanced thermal conduction agent.It is added to three by by carbon-based material
Phase-change material is prepared in water acetic acid sodium, the augmentation of heat transfer effect of phase-change material can be significantly improved.
In possible implementation method, expanded graphite can be chosen as enhanced thermal conduction agent.Expanded graphite is a kind of loose, many
The vermiform material in hole, has the advantages that thermal conductivity is good, chemical stability is good, nontoxic, absorption affinity is strong, specific surface area is big.Utilize
The mushy characteristic of expanded graphite, can produce capillary attraction effect to phase-change material, so as to be shaped to phase-change material, drop
The mobility of low composite phase-change material, solves the problems, such as phase-change material fluid leakage in solid-liquid transformation to a certain extent, carries
The heat endurance of phase-change material high；It is also possible that the heat transfer area increase of phase-change material, improves the heat-transfer effect of phase-change material.
The expanded graphite that this experiment is selected needs to expand its high temperature puffing its absorption property to phase-change material, tests
Middle use microwave method is processed.Microwave method has start-stop convenient, expanded uniform and energy-efficient compared with the expanded method of conventional high-temperature
The advantages of.Concrete scheme is as follows：
Expansible graphite powder (expansion rate 300mL/g) is placed in vacuum drying chamber 65 DEG C and dries 24h, then taken 1g and be put into
In 750mL ceramic crucibles, total power treatment 30s in micro-wave oven is put it into, expand expansible graphite, obtained after cooling
Expanded graphite is simultaneously fitted into standby in sealed plastic bag.
In possible implementation method, with respect to Sodium acetate trihydrate, the mass fraction of expanded graphite can be 3%~8%.When
When the mass fraction of expanded graphite is 3%~5%, the heat transfer efficiency of phase-change material is higher, heat storage performance preferably, phase transition temperature
Than relatively low.When the mass fraction of expanded graphite is more than 5%, the fixed effect of phase-change material preferably, can be preferably in high temperature
Maintain original shape.When the mass fraction of expanded graphite is 8%, the degree of supercooling of phase-change material is relatively low, and cyclical stability is preferable, heat release
The time range of decrease is smaller.
In possible implementation method, the raw material for preparing phase-change material can also be including in nucleator, thickener
Plant or two kinds.Wherein, nucleator is used to reduce the degree of supercooling of phase-change material.Degree of supercooling refers to the theoretical crystallization temperature and reality of material
The difference of border crystallization temperature.Each material has the theoretical crystallization temperature of oneself, but, it is actual in actual crystallization process
Always less than theoretical crystallization temperature, this phenomenon is referred to as cold phenomenon to crystallization temperature, and both temperature gaps are referred to as degree of supercooling.Cross
The size of cold degree is closely related with cooling velocity, and cooling velocity is faster, and actual crystallization temperature is lower, and degree of supercooling is bigger；Instead
Cooling velocity it is slower, degree of supercooling just it is smaller, actual crystallization temperature just closer to theory crystallization temperature.Degree of supercooling is bigger, phase transformation
Gap between the effect and the effect of desired suction heat release of the actual suction heat release of material is bigger.
Thickener is separated for suppressing phase-change material.Phase separation refers to the three water vinegar in the phase transition process for repeating
Sour sodium can be separated, and part sodium acetate does not dissolve in the crystallization water, is deposited in the bottom of phase-change material, and is no longer combined with the crystallization water
Generation Sodium acetate trihydrate, causes the formation of layering, final to cause energy storage reduction, lost of life of phase-change material etc..
In possible implementation method, nucleator can choose similar with crystalline hydrate salt structure, and can improve hydrated salt
Crystal property material, such as crystalline disodium hydrogen, sodium tetraborate, sodium metasilicate, sodium pyrophosphate, silica etc., preferably
Crystalline disodium hydrogen.Crystalline disodium hydrogen can promote the crystallization process of phase-change material, can effectively reduce phase-change material
Degree of supercooling, and there is in accumulation of heat exothermic process good stability and cheap and easy to get.
In specific implementation process, with respect to Sodium acetate trihydrate, the mass fraction of crystalline disodium hydrogen can be less than
3%.Preferably, because when the mass fraction of crystalline disodium hydrogen is 2%, the degree of supercooling of phase-change material is 2.67 DEG C, its
Highest exothermic temperature falls at 40 DEG C ± 0.25 DEG C, basically identical with temperature needed for floor panel heating, ideal, and can be with
Thickener has preferable compatible and mutual promoting action, so mass fraction of the crystalline disodium hydrogen in raw material can be
2%.Further increase the consumption of crystalline disodium hydrogen, degree of supercooling can be increased slightly.
Under the crystalline disodium hydrogen of the different quality containing of table 2, the DSC data of Sodium acetate trihydrate/formamide
In possible implementation method, thickener can choose polyvinyl alcohol, hydroxymethyl cellulose, sucrose, polyacrylamide
Amine, gum arabic etc., preferably polyvinyl alcohol.Polyvinyl alcohol can suppress phase-change material and be separated, and with accumulation of heat
Good stability and advantage cheap and easy to get in exothermic process.
In specific implementation process, with respect to Sodium acetate trihydrate, the mass fraction of polyvinyl alcohol can be 1%~2%.It is preferred that
, because when the mass fraction of polyvinyl alcohol is 2%, the enthalpy of phase change of phase-change material is higher, can suppress to be separated well,
So mass fraction of the polyvinyl alcohol in raw material can select to be 2%.
According to another aspect of the present invention, there is provided a kind of method for preparing phase-change material, comprise the following steps：
Step 1：The raw material for preparing phase-change material are weighed according to corresponding mass fraction, the raw material include phase transformation base
Body material Sodium acetate trihydrate, fusing point modifying agent formamide and enhanced thermal conduction agent, can also include nucleator and thickener；
Step 2：The mixture that raw material in addition to enhanced thermal conduction agent are formed is heated, until melting；
Step 3：By enhanced thermal conduction agent add melt mixture in and stir, obtain the phase-change material.
Phase-change material prepared by above method can be the phase-change material that foregoing embodiment is provided, it is also possible to
It is other phase-change materials, the embodiment of the present invention is without limitation.It is hereafter foregoing embodiment with the phase-change material
As a example by the phase-change material for being provided.
In specific implementation process, mixture heat until the method for example, immersion method for melting.By water-bath
Method is heated, and can make mixture thermally equivalent.The step of being heated by immersion method can be：Mixture is put into container and is mixed
Uniformly, then will be put into thermostat water bath after container closure again, until mixture melts completely.Closed vessel can avoid mixing
Compound chemically reacts with vapor, influences the chemical property of mixture.Preferably, the temperature span of thermostat water bath
Can be 40 DEG C~50 DEG C, the phase transition performance of phase-change material can be caused to be not suitable for making phase transformation more than 50 DEG C or less than 40 DEG C and built
Build material.
Preferably, can be stirred in enclosed environment thawing mixture and enhanced thermal conduction agent until well mixed, to keep away
Exempt from and air contact, the stabilization of the physicochemical property of the final phase-change material for preparing is ensured as far as possible.
The method for preparing phase-change material that the present invention is provided is introduced in citing below.
Embodiment 1
Weigh 20g Sodium acetate trihydrates, 5g formamides, 0.4g crystallines disodium hydrogen, 0.4g polyvinyl alcohol；
Formamide, crystalline disodium hydrogen, polyvinyl alcohol and Sodium acetate trihydrate are put into vial and are well mixed, then
It is put into after vial is closed again in 50 DEG C of thermostat water bath, until mixture melts completely；
Expanded graphite is added in mixture to thawing, and under air-tight state, is mechanically stirred, until
It is well mixed, obtain the phase-change material.Wherein, the mass fraction scope of expanded graphite is 3%~8%.Carry out mechanical agitation
Mode be that, for example with heat collecting type constant-temperature heating magnetic stirring apparatus, mixing time is generally 4 hours.
According to another aspect of the present invention, a kind of construction material is additionally provided, the construction material includes building substrate material
With phase-change material of the invention, the construction material for example can be used for Manufacture of Floor and metope etc..Making the construction material
During, building substrate material can be mixed with water first, and foregoing phase-change material is mixed during mixing,
By stirring so that being well mixed, phase-change material of the invention is included in the construction material for finally obtaining.
Phase-change material of the invention is phase transformation matrix material with Sodium acetate trihydrate, and is preparing the process of phase-change material
In add enhanced thermal conduction agent and fusing point modifying agent formamide.When enhanced thermal conduction agent is preferably expanded graphite, on the one hand reduce
The mobility of composite phase-change material, improves the heat endurance of phase-change material, on the other hand causes the heat transfer area of phase-change material
Increase, improves the heat-transfer effect of phase-change material；Fusing point modifying agent reduces the phase transition temperature of phase-change material, is allowed to be applied to normal
The energy-storage system run in warm environment.
Heat accumulation experiments under different bath temperatures
Prepare phase-change material sample according to the preparation method described in embodiment 1, be placed in different bath temperatures (43 DEG C, 45 DEG C,
48 DEG C, 50 DEG C) under carry out accumulation of heat melting experiment.In four samples, the mass fraction of expanded graphite (EG) is respectively 3%, 5%,
8% and 10%, expanded graphite is free of in reference substance.
Intensification melting process curve at 43 DEG C is shown in Fig. 1.Wherein, SAT/FA CPCM refer to being not added with expanded graphite
Sodium acetate trihydrate/formamide material.
The thermal storage time of phase-change material under the different bath temperatures of table 3
Can substantially be found by Fig. 1, phase-change material temperature-rise period is roughly divided into and is rapidly heated, slowly heats up and comparatively fast heat up three
Individual stage, sensible heat (S-S), latent heat (S-L) and sensible heat (L-L) accumulation of heat corresponding to composite phase-change material.Different quality containing EG
The difference major embodiment of the heat-accumulating process of lower phase-change material is in the first stage.The heating rate for adding the phase-change material of EG is substantially excellent
In Sodium acetate trihydrate/formamide material (control group), and with the increase of EG amounts, heating rate gradually rises；Tracing it to its cause is
Phase-change material containing EG, because thermal conductivity factor is improved, rapidly can in time be transferred to phase transformation by the heat that water-bath is provided
Material, so that material temperature rise is accelerated.The fusion curve of composite, also sends out at 45 DEG C, 48 DEG C and 50 DEG C of other bath temperatures
The Changing Pattern being now similar to, detailed data is shown in Table 3.
As can be seen from Table 3, at a temperature of identical water bath with thermostatic control, the heat-conductive characteristic of phase-change material, with the increase of EG
And substantially increase, show that its heating and melting reaches the time shortening of correspondence bath temperature, and its range of decrease carrying with bath temperature
It is high and increase.When EG mass fractions are 10%, bath temperature corresponds to 43,45,48 and 50 DEG C, and its heating fusing reaches setting water
The time range of decrease of bath temperature is respectively 28.79,43.10,48.92 and 54.65%.The above results show, with the increase of EG, material
Material augmentation of heat transfer enhancing；Lifted with bath temperature is set, its augmentation of heat transfer effect is better.
Latent heat releasing performance under different bath temperatures
Phase-change material sample is prepared according to the preparation method described in embodiment 1.In four samples, the matter of expanded graphite (EG)
Amount fraction is respectively 3%, 5%, 8% and 10%, and expanded graphite is free of in reference substance.
Tested by the heat release under different bath temperatures, heat release initial temperature at a temperature of different water baths can be investigated
(Ts), maximum temperature (Th), degree of supercooling (△ T) and Exotherm Time (tr) etc. parameter.Bath temperature is respectively provided with for 31,33,35 and
37 DEG C, melt to it thermostatted water bath water that sample and reference substance are first placed in 50 DEG C and be completely melt, be then placed within not
With heat release is carried out under water bath with thermostatic control, its cooling curve is tested.When bath temperature is 31 DEG C, the cooling curve of phase-change material is shown in Fig. 2.
As seen from Figure 2, under 31 DEG C of bath temperature, Sodium acetate trihydrate/formamide material and different EG contents
There is heat release platform in phase-change material；When bath temperature is higher than 31 DEG C, at such as 33,35,37 DEG C, the former does not occur heat release and puts down
Platform, and the material of EG is added, there is exothermic peak to occur.Show the addition due to EG, reduce the degree of supercooling of phase-change material, while
Crystallization heat can be discharged in time.Sodium acetate trihydrate/formamide the material at 33,35 and 37 DEG C is examined in experimentation
Material, occurs in that a small amount of crystal in sample bottle, its mobility is also reduced.The result shows that sample generates a small amount of crystallization heat,
But because heat release is less, heat transfer is very fast in water-bath cooling procedure, therefore occurs without heat release platform.
First in the cooling curve of phase-change material puts temperature, highest heat release temperature, degree of supercooling result under different bath temperatures
It is shown in Table 4.
As shown in Table 4, Sodium acetate trihydrate/formamide material (control group), at a temperature of 31 DEG C of water baths, its degree of supercooling
It it is 2.15 DEG C, after EG is added, the degree of supercooling reduction of phase-change material is controlled within 2 DEG C substantially, and addition EG is more, supercooling
Degree is smaller, illustrates that the addition of EG plays the role of to promote nucleation, reduces degree of supercooling.Possible the reason for is that the addition of EG makes the temperature of system
Degree is more uniform, while EG is acted on the capillary attraction of Sodium acetate trihydrate/formamide material, plays sizing to composite and makees
With, the phase separation situation of system is improved, therefore its degree of supercooling decreases.When bath temperature lifting is such as 33 DEG C, 35 DEG C, 37 DEG C
When, the heat release initial temperature of phase-change material, maximum temperature have been lifted.Possible the reason for is under water bath condition, to add EG
Accumulation of heat system initial heat emission temperatures, maximum temperature and water-bath temperature difference it is smaller, the crystallization heat that phase-change material is produced is difficult
Rapidly to be exchanged heat with water-bath, therefore, corresponding temperature is raised.
From in terms of the Exotherm Time of phase-change material, due to the addition of EG, the latent heat of phase change reduction of phase-change material, while its heat release
Speed increases, and common effect shortens its Exotherm Time；With the rising of bath temperature, under identical EG contents, due to multiple
Condensation material is reduced with the water-bath temperature difference, and its Exotherm Time is more long.
The cooling curve data of phase-change material under the different bath temperatures of table 4
Cyclical stability is evaluated
Phase-change material sample is prepared according to the preparation method described in embodiment 1 and carry out following dsc analysis and cooling curve
Test, to evaluate cyclical stability.In four samples, the mass fraction of expanded graphite is respectively 3%, 5%, 8% and 10%, right
According in product be free of expanded graphite.
50 DEG C of bath temperature is set, phase-change material is placed in one heating, the constant temperature 1.5h after 50 DEG C of arrival；Water-bath is set
15 DEG C of temperature, wherein heat release, and the constant temperature 1.5h after reaching 15 DEG C are shifted by sample.Mono- circulation of about 5h.Carry out 1 respectively,
100th, 200,300,400 circulations, and be measured with DSC and cooling curve.
Dsc analysis
The present invention using the DSC Q20 determination samples of TA instrument companies of the U.S. DSC curve, test temperature it is interval for 0~
80 DEG C, temperature rate is 5 DEG C of min-1, atmosphere is N2, reference is Al.Determine the DSC curve and phase alternating temperature of material sample
The transformation behavior characteristic parameter such as degree, peak temperature, enthalpy of phase change.
Cooling curve is tested
Thermocouple is inserted equipped with composite phase-change material vial respectively, being placed in 60 DEG C of waters bath with thermostatic control carries out accumulation of heat reality
Test, after the completion of heat accumulation experiments, then be placed in constant temperature (general set 20 DEG C of air themperature) biochemical cultivation case and carry out heat release examination
Test.By the Agilent 34970A data collecting systems of computer controls, (hewlette-packard product, matches somebody with somebody temperature in experimentation
T-shaped thermocouple) carry out limnograph.Data collecting instrument records a change for temperature data, observation medicine solidification per 10s
During phenomenon and pass through the corresponding temperature variation curve of computer export.Different rings can be investigated by water-bath (air bath)
Crystallization onset temperature (is denoted as T at a temperature of borderS), maximum temperature (Th), degree of supercooling (being denoted as Δ T), Exotherm Time (is denoted as trFrom opening
Begin to remember to set environment temperature is reached during crystallization).
Table 5 to table 9 is followed successively by the mass fraction of expanded graphite under the conditions of 0,3%, 5%, 8%, 10%, phase-change material warp
DSC and cooling curve test obtained data after circulating for 1 time, 100 times, 200 times, 300 times, 400 times.
When table 5 is not added with expanded graphite, phase-change material cyclical stability test data
Note：aMeasured by DSC；bObtained from cooling curve；Similarly hereinafter.
Melt temperature and peak temperature in melting process measured by DSC in table 5, by 1 time, 100 times, 200
Secondary, 300 times, 400 times circulations phase-change material, its fusing point, peak temperature fluctuate smaller (within ± 2 DEG C).Latent heat of phase change phase
Circulated than first time, amount of decrease is followed successively by 4.06%, 10.52%, 17.10% and 20.09%.Obtained by cooling curve in table 5
Data understand, putting temperature, highest heat release temperature through repeatedly circulation, at the beginning of material crystalline slightly has reduction, and degree of supercooling has increased slightly (± 1
Within DEG C)；From in terms of Exotherm Time, through the circulation of 100 times, 200 times, 300 times and 400 times, circulated compared to first time, during its heat release
Between reduced, the range of decrease is followed successively by 6.45%, 7.97%, 11.99% and 16.70%, decays basic phase with the enthalpy of phase change of material
Correspondence.Show that phase-change material (Sodium acetate trihydrate/formamide) has preferable cyclical stability.
When the mass fraction of the expanded graphite of table 6 is 3%, phase-change material cyclical stability experimental data
Tested from DSC in table 6, phase-change material (Sodium acetate trihydrate/formamide/3% expanded graphite) is followed by 400 times
After ring, its fusing point, the fluctuation of peak temperature are larger；Often increase by 100 circulations, the latent heat of phase change of phase-change material is compared to circulation for the first time, drop
Width is followed successively by 9.81%, 37.52%, 45.11% and 72.81%.Equally, temperature is put at the beginning of the material crystalline for measuring by cooling curve
Degree, highest heat release temperature fluctuation are larger, preceding 300 circulations, material degree of supercooling very little, and through 400 circulations, material has not had phase transformation
Platform；From in terms of Exotherm Time, circulated compared to first time, the Exotherm Time range of decrease of material is followed successively by 7.50%, 31.15%,
42.88% and 60.00%.Show under the formula phase-change material crash.The reason for causing this phenomenon is probably addition
Expanded graphite amount is fewer, and the adsorbance to Sodium acetate trihydrate/formamide is smaller so that material it is dispersed poor, when multiple
Layering is occurred in that after circulation, makes its penalty.
When the mass fraction of the expanded graphite of table 7 is 5%, phase-change material cyclical stability experimental data
When the mass fraction of the expanded graphite of table 8 is 8%, phase-change material cyclical stability experimental data
Melt temperature and peak temperature in melting process measured by DSC in table 7 to table 9, except expanded graphite
Mass fraction when being 5%, first time recycled material fusing point is (may dispersiveness not exclusively) higher, remaining by 1 time, 100 times,
200 times, 300 times and 400 times circulations, fusing point, the peak temperature of phase-change material fluctuate within ± 1 DEG C；Through circulation 100 times,
After 200 times, 300 times and 400 times, circulated compared to first time, when the mass fraction of expanded graphite is 5%, phase-change material (three water vinegar
Sour sodium/formamide/5% expanded graphite) the enthalpy of phase change range of decrease is followed successively by 1.67%, 7.41%, 17.24% and 22.52%；Correspondence
Ground, when the mass fraction of expanded graphite is 8%, the phase-change material enthalpy of phase change range of decrease be followed successively by 3.41%, 3.78%, 5.17% and
9.65%；When the mass fraction of expanded graphite is 10%, the phase-change material enthalpy of phase change range of decrease is followed successively by 1.74%, 0.90%,
0.12% and 6.89%.
Composite starting exothermic temperature, peak temperature are can be seen that through 400 circulations from cooling curve acquired results
Afterwards, the mass fraction of expanded graphite is 5% phase-change material, and initial heat emission temperatures, peak temperature fluctuation are larger；And expanded graphite
Mass fraction be 8% or 10% phase-change material fluctuation it is smaller；From the point of view of degree of supercooling, the mass fraction of expanded graphite is 5%
Or 8% phase-change material is smaller, and the mass fraction of expanded graphite be 10% phase-change material degree of supercooling it is larger (be probably expansion
Quantity of graphite is more, and the integrality influence on the crystallization of Sodium acetate trihydrate/formamide is larger)；From the point of view of the Exotherm Time range of decrease, warp
100 times, 200 times, 300 times 400 times circulations, the mass fraction of expanded graphite is 5% phase-change material, with first time circulation phase
Than its Exotherm Time range of decrease is respectively 3.57%, 7.74%, 20.44% and 23.21%；Accordingly, the quality of expanded graphite point
Number is 8% phase-change material, and its Exotherm Time range of decrease is respectively 4.05%, 7.46%, 8.10% and 8.96%；Expanded graphite
Mass fraction is 10% phase-change material, and its Exotherm Time range of decrease is respectively 2.26%, 3.61%, 7.45% and 8.80%.
When the mass fraction of the expanded graphite of table 9 is 10%, phase-change material cyclical stability experimental data
The above analysis, with not plus compared with expanded graphite, adds the phase-change material of expanded graphite, and cyclical stability is more
Height, shows that material phase transformation enthalpy, the Exotherm Time range of decrease are relatively low, and the smaller and degree of supercooling of phase transition temperature fluctuation of phase-change material is relatively low
Etc. aspect；Phase-change material under different expanded graphite contents, when the mass fraction of expanded graphite it is relatively low as 3% when, phase-change material
It is dispersed poor, its enthalpy, the Exotherm Time range of decrease are larger；The mass fraction of expanded graphite is 8% or 10% phase-change material
Combination property is more excellent, shows that enthalpy, the Exotherm Time range of decrease are smaller, and comparatively speaking, the mass fraction of expanded graphite is 8%
Phase-change material cyclical stability is higher, shows that the degree of supercooling of phase-change material is relatively low.
Sem analysis
Fig. 3 is under different quality number expanded graphite, the SEM of phase-change material schemes.Wherein, a, the b in Fig. 3 are respectively EG and exist
Multiplication factor is 1000,5000 times of SEM figures；And c, d, e, the f in Fig. 3 are respectively 3%, 5%, 8%, 10% mass fraction
The phase-change material of expanded graphite amplifies 5000 times of shape appearance figure.From a, b in Fig. 3, expanded graphite has abundant hole knot
Structure, for absorption phase-change material provides good carrier occasion.From the c~e in Fig. 3, when the mass fraction of expanded graphite
For 3% when, Sodium acetate trihydrate/formamide material fails to be inflated completely graphite absorption, still has and is covered in expanded graphite on a small quantity
Top layer, but there is certain fixed effect；When the expanded graphite of 5% and the above is added, Sodium acetate trihydrate/formamide is multiple
Condensation material preferably can be filled into the hole of expanded graphite, and expanded graphite plays sizing, be in particular in when melting
During change, the capillary force of expanded graphite can make liquefied Sodium acetate trihydrate/formamide material be difficult to infiltrate.
POM is analyzed
Observed using melting situation of the card DM2500P petrographic microscopes to phase-change material when temperature changes is come.
Fig. 4 is that (a~e in Fig. 4 is corresponding in turn to 0,3%, 5%, 8%, 10% expansion to different quality containing expanded graphite
Graphite) under, the POM figures of phase-change material.From a in Fig. 4, at room temperature (20 DEG C), the phase transformation material of expanded graphite is not added with
Material, with obvious crystallization refraction effect (white)；When being warmed up near fusing point (40 DEG C), due to partial melting, crystal folding
Penetrate and die down, dark-coloured fused mass occurs in periphery；When further heating up to higher than 20 DEG C of its fusing point (60 DEG C), white crystal is complete
Disappear, due to having certain mobility after crystals melt, permeated into larger drop.From the b in Fig. 4, at room temperature,
The phase-change material that the expanded graphite of addition 3% is obtained has obvious crystallization refraction effect, simply unlike Sodium acetate trihydrate/formamide
, there is certain dispersiveness in composite；When 40 DEG C of its melt temperature is heated to, the crystal structure of material center becomes
Change, gradually obscure (white clouds shape)；Further heat up to 60 DEG C, be atomized more obvious, edge of materials appearance infiltration, show to expand stone
The mass fraction of ink is that 3% fashion is not enough to support the phase transformation of Sodium acetate trihydrate/formamide to melt, that is, do not reach what is shaped completely
Purpose.When the mass fraction of expanded graphite is 5%, 8% or 10%, as shown in c, d, e in Fig. 4, composite phase-change material is heated
Material has no that its crystal refraction effect changes to fusing point and higher than 20 DEG C of fusing point, i.e., the structure of material does not occur significantly
Change, shows that the liquid state phase change material of thawing can be adsorbed when the addition of expanded graphite is enough, and phase-change material is played very
Good styling.
Measured Results of Thermal Conductivity
Using the Hot Disk TPS2500 thermal constant analyzers of Hot Disk companies of Sweden, determine sodium acetate and answer
Close the thermal conductivity factor of phase-change material.Concrete operations are as follows：By sample melted, mould is injected, file and sand paper are used after solidification by sample
Product surface rubbing.Probe is fixed on support, first piece sample steel table center, and raises sample, make sample strip upper surface and
Probe lower surface is completely attached to, and adjustment sample position ensures center probe and sample center superposition.Second sample is placed on
Probe above, tightens steel bridge centre bolt, it is ensured that two pieces sample strip is inquired into test and contacts good.
Under different quality number expanded graphite, the thermal conductivity factor of phase-change material is as shown in Figure 5.As shown in Figure 5, addition expansion
After graphite, the thermal conductivity factor of phase-change material has greatly improved, and increases with the increase of expanded graphite mass fraction, addition
3%th, the phase-change material of 5%, 8%, 10% expanded graphite, its thermal conductivity factor is respectively the phase-change material that is not added with expanded graphite
3.11st, 3.21,3.94,4.39 times.Therefore, the addition of expanded graphite can significantly improve the heat-conductive characteristic of phase-change material, if should
For phase change heat accumulator, phase-change material accumulation of heat can be rapidly transferred heat to, rapidly can equally passed out latent heat of phase change
Go.From the time, it melts, the crystallization exotherm time will significantly shorten.
XRD analysis
It is analyzed using the full-automatic X-ray diffractometer (XRD) of German Bruker companies model D8Advance, if
Put 5 ° to 80 ° of sweep limits, sweep speed 0.2 second/step, 0.04 ° of scanning step, Cu targets.Characterize phase in composite material
Structure change.
XRD analysis are carried out to the phase-change material under expanded graphite and different quality number expanded graphite, as shown in Figure 6.
Wherein, SAT/FA represents the Sodium acetate trihydrate/formamide material for being not added with expanded graphite.
It will be appreciated from fig. 6 that Sodium acetate trihydrate/formamide has with the main characteristic peak of expanded graphite in phase-change material
It is existing, the phase-change material of expanded graphite is added with addition compared with Sodium acetate trihydrate/formamide material, the diffraction when 2 θ are 45.9 °
Peak is disappeared.Compare the XRD of phase-change material under different expanded graphite mass fractions it can be found that with the increasing of expanded graphite content
Plus, 2 θ be respectively 11.81 °, 17.09 °, the diffraction peak intensity reduction of Sodium acetate trihydrate/formamide is belonged at 23.04 °, and
It is that 26.16 ° of diffraction peak intensities for belonging to expanded graphite gradually increase in 2 θ, possible cause is：Expanded graphite has certain
Ripple effect is inhaled, causes to be disappeared in the diffraction maximum that 2 θ are 45.9 ° in phase-change material；On the other hand, with the increasing of expanded graphite consumption
Plus, eutectic crystal content reduction in phase-change material causes Sodium acetate trihydrate/formamide diffraction maximum to weaken, accordingly swollen
Swollen graphite diffraction peak intensity enhancing.
FTIR is analyzed
Fig. 7 be different quality containing expanded graphite under, the FTIR spectrograms of phase-change material.Wherein, a~b corresponds to expansion respectively
Graphite, Sodium acetate trihydrate/formamide material, c~f are corresponding in turn under mass fraction is 3%, 5%, 8%, 10% expanded graphite
Phase-change material.
From a in Fig. 7, expanded graphite is in 1433.04cm-1Place's absworption peak belongs to C-C stretching vibrations, 3500cm-1
The absworption peak of appearance is-OH key stretching vibrations, 1080.07cm-1It is the carbonyl absorption peak (1200~1050cm of carboxyl-1).May
It is that a small amount of water is adsorbed in expanded graphite space and there occurs intermolecular association with expanded graphite.B, a in compares figure 7
Understood with c, d, e, the f in Fig. 7, addition EG amounts are respectively 3%, 5%, 8%, 10% phase-change material FTIR spectrums, in general
It is being superimposed for expanded graphite spectrogram and Sodium acetate trihydrate/formamide material spectrogram, while occurring without new peak, shows to expand stone
Not there is chemical change between ink and SAT/FA composites, simply simple physical mixed.Can be sent out additionally by comparing
It is existing, with the increase of expanded graphite addition, in 1690cm-lThere is vibration frequency at place's absworption peak (the C=O stretching vibrations of amide I band)
The trend that rate reduces.The reason for causing this phenomenon be, the worm complexity pore structure blackbody cavity of expanded graphite, to infra-red radiation
There is very strong absorption.
Obviously, those skilled in the art can carry out various changes and modification without deviating from essence of the invention to the present invention
God and scope.So, if these modifications of the invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (10)
1. a kind of phase-change material, it is characterised in that including Sodium acetate trihydrate, formamide and enhanced thermal conduction agent；With respect to acetate trihydrate
Sodium, formamide is no more than 40wt%, and enhanced thermal conduction agent is 3-10wt%；The enhanced thermal conduction agent is carbon-based material.
2. phase-change material as claimed in claim 1, it is characterised in that the carbon-based material is expanded graphite or carbon fiber.
3. phase-change material as claimed in claim 1 or 2, it is characterised in that the phase-change material also includes nucleator, thickener
In one or two.
4. phase-change material as claimed in claim 3, it is characterised in that the nucleator is selected from sodium tetraborate, sodium metasilicate, burnt phosphorus
Sour sodium, silica, crystalline disodium hydrogen, the thickener are selected from hydroxymethyl cellulose, polyvinyl alcohol, sucrose, polypropylene
Acid amides, gum arabic.
5. phase-change material as claimed in claim 3, it is characterised in that with respect to Sodium acetate trihydrate, nucleator be less than 3wt%,
Thickener is 1-2wt%.
6. phase-change material as claimed in claim 3, it is characterised in that with respect to Sodium acetate trihydrate, formamide is 25wt%, heat conduction
Reinforcing agent is 3-8wt%, and nucleator is 2wt%, and thickener is 2wt%.
7. phase-change material as claimed in claim 3, it is characterised in that including Sodium acetate trihydrate, formamide, expanded graphite, knot
Brilliant disodium hydrogen phosphate and polyvinyl alcohol；With respect to Sodium acetate trihydrate, formamide is 25wt%, and expanded graphite is 3-8wt%, crystallizes phosphorus
Sour disodium hydrogen is 2wt%, and polyvinyl alcohol is 2wt%.
8. a kind of method for preparing the phase-change material as described in claim 1-7 is any, it is characterised in that including：
Step 1：The raw material for preparing phase-change material are weighed according to corresponding mass fraction, the raw material include phase transformation matrix material
Material Sodium acetate trihydrate, fusing point modifying agent formamide and enhanced thermal conduction agent；
Step 2：The mixture that raw material in addition to enhanced thermal conduction agent are formed is heated, until melting；
Step 3：By enhanced thermal conduction agent add melt mixture in and stir, obtain the phase-change material.
9. method as claimed in claim 8, it is characterised in that in step 1, the raw material also include nucleator, thickener
In one or two.
10. a kind of construction material, it is characterised in that the construction material includes any described phase-change materials of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710134312.5A CN106928904A (en) | 2017-03-08 | 2017-03-08 | A kind of phase-change material and preparation method thereof and a kind of construction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710134312.5A CN106928904A (en) | 2017-03-08 | 2017-03-08 | A kind of phase-change material and preparation method thereof and a kind of construction material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106928904A true CN106928904A (en) | 2017-07-07 |
Family
ID=59424589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710134312.5A Pending CN106928904A (en) | 2017-03-08 | 2017-03-08 | A kind of phase-change material and preparation method thereof and a kind of construction material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106928904A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107325793A (en) * | 2017-07-31 | 2017-11-07 | 河北麦森钛白粉有限公司 | A kind of phase change cold-storage composite and preparation method thereof |
| CN109554164A (en) * | 2017-09-26 | 2019-04-02 | 西南科技大学 | A kind of composite phase-change material and preparation method thereof |
| CN110591654A (en) * | 2019-09-29 | 2019-12-20 | 新奥石墨烯技术有限公司 | Phase-change heat storage composite material and preparation method thereof |
| CN110878198A (en) * | 2018-09-06 | 2020-03-13 | 陕西久维电力工程有限公司 | Phase-change material for storing solar heat and preparation method and application thereof |
| CN113294020A (en) * | 2021-05-31 | 2021-08-24 | 河南工业大学 | Heat-preservation and heat-insulation grain steel plate bin |
| CN114958308A (en) * | 2022-04-19 | 2022-08-30 | 山东大学 | Anhydrous salt phase change heat storage material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805591A (en) * | 2010-04-19 | 2010-08-18 | 中国人民解放军理工大学工程兵工程学院 | Inorganic hydrated salt expanded graphite composite phase-changing heat storage material and preparation method thereof |
-
2017
- 2017-03-08 CN CN201710134312.5A patent/CN106928904A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805591A (en) * | 2010-04-19 | 2010-08-18 | 中国人民解放军理工大学工程兵工程学院 | Inorganic hydrated salt expanded graphite composite phase-changing heat storage material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 金策: "甲酰胺/三水醋酸钠复合相变蓄热材料应用研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107325793A (en) * | 2017-07-31 | 2017-11-07 | 河北麦森钛白粉有限公司 | A kind of phase change cold-storage composite and preparation method thereof |
| CN109554164A (en) * | 2017-09-26 | 2019-04-02 | 西南科技大学 | A kind of composite phase-change material and preparation method thereof |
| CN110878198A (en) * | 2018-09-06 | 2020-03-13 | 陕西久维电力工程有限公司 | Phase-change material for storing solar heat and preparation method and application thereof |
| CN110878198B (en) * | 2018-09-06 | 2021-05-18 | 陕西久维电力工程有限公司 | Phase-change material for storing solar heat and preparation method and application thereof |
| CN110591654A (en) * | 2019-09-29 | 2019-12-20 | 新奥石墨烯技术有限公司 | Phase-change heat storage composite material and preparation method thereof |
| CN113294020A (en) * | 2021-05-31 | 2021-08-24 | 河南工业大学 | Heat-preservation and heat-insulation grain steel plate bin |
| CN113294020B (en) * | 2021-05-31 | 2023-08-18 | 河南工业大学 | Thermal-insulated grain steel sheet storehouse keeps warm |
| CN114958308A (en) * | 2022-04-19 | 2022-08-30 | 山东大学 | Anhydrous salt phase change heat storage material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106928904A (en) | A kind of phase-change material and preparation method thereof and a kind of construction material | |
| Liu et al. | A foamed cement blocks with paraffin/expanded graphite composite phase change solar thermal absorption material | |
| Sang et al. | Form-stable ternary carbonates/MgO composite material for high temperature thermal energy storage | |
| CN104562192B (en) | Casting method for polycrystalline silicon ingot | |
| CN106701034A (en) | Solid composite phase-change thermal storage material and preparation method thereof | |
| CN101376583A (en) | Hidden heat energy storage type gypsum-based construction material | |
| Liu et al. | Development of calcium silicate-coated expanded clay based form-stable phase change materials for enhancing thermal and mechanical properties of cement-based composite | |
| CN100455546C (en) | Ultraporous ceramic base heat accumulating material and its preparation method | |
| Liu et al. | Preparation and thermal properties of low melting point alloy/expanded graphite composite phase change materials used in solar water storage system | |
| CN107142383B (en) | Titanium additive and its preparation process | |
| CN107032318B (en) | A kind of nitrogenous carbon material of sheet and preparation method thereof | |
| Hua et al. | Preparation of modified sodium acetate trihydrate and the thermodynamic analysis | |
| Xu et al. | Preparation and performance study of cordierite/mullite composite ceramics for solar thermal energy storage | |
| CN107245326A (en) | A kind of high-temperature phase change heat accumulation microcapsules and preparation method thereof | |
| CN207922928U (en) | High-temperature heat storage device based on enhanced thermal conduction type fuse salt composite phase-change material | |
| Jiang et al. | Improved thermal conductivity of form-stable NaNO3: using the skeleton of porous ceramic modified by SiC | |
| Bruno et al. | Solid-liquid phase change materials for thermal energy storage | |
| CN109052472A (en) | A kind of layer structure V6O13Positive electrode and preparation method thereof | |
| Wadee et al. | Lightweight aggregates as carriers for phase change materials | |
| CN110144194A (en) | A kind of fly ash base solid-solid composite phase change energy-storing exothermic material and preparation method thereof | |
| CN110408367A (en) | High temperature composite inorganic phase change heat storage material and preparation method | |
| Suzuki et al. | Synthesis of porous Al/Al3Ti composite with hierarchical open–cell structure for combining with phase change material | |
| Li et al. | Influence of curing conditions on mechanical properties and microstructure of magnesium potassium phosphate cement | |
| Wang et al. | Preparation and characterization of a form-stable phase change hydrogel for heat-protective clothing | |
| CN108220726B (en) | Mg-Zn-Ni low corrosion high-temperature phase-change heat storage material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170707 |
|
| RJ01 | Rejection of invention patent application after publication |