CN109135678A - Room temperature phase change energy storage material and preparation method thereof - Google Patents
Room temperature phase change energy storage material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a room temperature phase change energy storage material and a preparation method thereof, wherein MgCl is added into hydroxylated carbon nano-tubes and inorganic salt simultaneously2·6H2O‑CaCl2·6H2The O phase-change material can generate synergistic effect as a composite nucleating agent to promote the nucleation of the phase-change material together, so that the supercooling degree of the system is obviously reduced. The invention has the beneficial effects that: when CNTs, SrCO3、SrCl2·6H2When the introduced amount of O is 0.75g, 0.3g and 0.9g respectively, the supercooling degree of the system is only 0.6 ℃, and the system has stronger heat storage capacity and good cycle stability.
Description
Technical field
The present invention relates to technical field of phase-change energy storage, more particularly to a kind of room temperature phase-change energy-storage material and its preparation
Method.
Background technique
China Qinghai Salt Lake area magnesium salts reserves are extremely abundant, and quality is higher, but a large amount of magnesium salts is suitable because not finding
Purposes be acknowledged as " magnesium evil ".In numerous magnesium salts, MgCl2·6H2O has high fusing heat (171kJ/kg), conduct
Phase-changing energy storage material is widely studied, but since phase transition temperature is higher (118 DEG C), realizes that it is applied at room temperature, it is necessary to
CaCl2·6H2The materials such as O form compound system.However, inorganic salt hydrate is applied in phase-change accumulation energy field, generally existing supercooling
Spend the problems such as big, poor thermal conductivity is with mutually separating.Hydroxyl carbon nano tube has hydroxyl group, this can in phase-change material from
Son combines, and helps to improve the wettability between carbon nanotube and phase-change material；Specific surface area of carbon nanotube is phase transformation
Material provides bigger heterogeneous nucleation interface and more nucleating points, heterogeneous nucleation can occur with promotion system, reduce at
Nuclear barrier, and then reduce degree of supercooling；Carbon nanotube have good heating conduction, can in phase-change material forming properties it is superior
Heat conduction network keeps system more sensitive to temperature to improve the heating conduction of system, reduces temperature hysteresis.According to " dot matrix
With principle ", inorganic salts (strontium salt) and MgCl2·6H2O-CaCl2·6H2The crystal structure and lattice parameter of O system are close, make table
Face can reduce, and play catalytic action to forming core, and then reduce degree of supercooling.Hydroxyl carbon nano tube is added simultaneously with inorganic salts
MgCl2·6H2O-CaCl2·6H2It can produce synergistic effect as composite nucleating agent in O phase-change material, collectively promote phase transformation material
Material nucleation, so that system degree of supercooling be made to significantly reduce.
Summary of the invention
In view of the technical drawbacks of the prior art, it is an object of the present invention to provide a kind of high thermal conductivities, high heat storage room
The preparation method of warm phase-changing energy storage material.
The technical solution adopted to achieve the purpose of the present invention is:
The present invention is achieved by following technical solution.
A kind of preparation method of room temperature phase-change energy-storage material of the invention, comprising the following steps:
(1) CaCl is weighed respectively2·6H2O and MgCl2·6H2O crystal, heating, is completely melt mixture；
(2) magnetic agitation 1-3h at 60~100 DEG C of system prepared step (2), be added in whipping process thickener and
Hydroxyl carbon nano tube, 40~50 DEG C of 1~2h of ultrasonic disperse, until system is uniformly mixed；
(3) SrCl is weighed again2·6H2O and SrCO3Step (3) preparation is added separately to collectively as inorganic salts nucleating agent
In system, in which: magnetic agitation 1-3h at 60~100 DEG C, 40~50 DEG C of 1~2h of ultrasonic disperse finally obtain MgCl2·6H2O-
CaCl2·6H2O room temperature phase-change energy-storage material；
Wherein: it is 0~0.5%, i.e. hydroxylating that mass fraction, which is added, as nucleating agent in hydroxyl carbon nano tube in step (2)
The quality of carbon nanotube is in MgCl2·6H2O-CaCl2·6H20~0.5% is accounted in O room temperature phase-change energy-storage material；
SrCO in step (3)3SrCl2·6H2O and SrCO3It is i.e. SrCO that total mass fraction, which is added,3SrCl2·6H2O and
SrCO3Quality in MgCl2·6H2O-CaCl2·6H20~5% is accounted in O room temperature phase-change energy-storage material.
Preferably, the CaCl in the step (1)2·6H2O and MgCl2·6H2O crystal is prepared by following steps: will
Anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in deionized water, and 60~100 DEG C are configured near saturated solution, are filtered while hot
Purification is stood for 24 hours at room temperature, is filtered removal liquid, is obtained the CaCl of high-purity2·6H2O、MgCl2·6H2O crystal；
Preferably, the CaCl in the step (1)2·6H2O and MgCl2·6H2O crystal quality ratio be (1:5)~(5:
1)。
Preferably, the thickener in the step (2) is hydroxyethyl cellulose or polyacrylamide.
Preferably, the SrCl in the step (3)2·6H2O and SrCO3Mass ratio is (1:5)~(5:1).
Preferably, CaCl in the reaction system2·6H2O and MgCl2·6H2The additional amount of O crystal is respectively
71.81wt.% and 23.94wt.%, i.e. CaCl2·6H2O and MgCl2·6H2The quality of O crystal is in MgCl2·6H2O-
CaCl2·6H271.81wt.% and 23.94wt.%, hydroxyl carbon nano tube, SrCO are accounted in O room temperature phase-change energy-storage material3With
SrCl2·6H2O additional amount is respectively 0.25wt.%, 1wt.% and 3wt.%, i.e. hydroxyl carbon nano tube, SrCO3With
SrCl2·6H2O is in MgCl2·6H2O-CaCl2·6H2Accounted in O room temperature phase-change energy-storage material 0.25wt.%, 1wt.% and
3wt.%.
Another aspect of the present invention further includes a kind of MgCl prepared by the above method2·6H2O-CaCl2·6H2The room O
Warm phase-change material.
Preferably, the MgCl2·6H2O-CaCl2·6H2Containing mass fraction in O room temperature phase-change material is 0~0.5%
Hydroxylating carbon nanotube nucleating agents and total mass fraction be 0~5% SrCl2·6H2O and SrCO3Inorganic salts nucleating agent.
Preferably, in the MgCl2·6H2O-CaCl2·6H2In O room temperature phase-change material, CaCl2·6H2O and MgCl2·
6H2O crystal quality score is respectively 71.81wt.% and 23.94wt.%, the mass fraction of hydroxylating carbon nanotube nucleating agents
For 0.25wt.%, SrCO3Mass fraction be 1wt.%, SrCl2·6H2The mass fraction of O is 3wt.%.
Preferably, the MgCl2·6H2O-CaCl2·6H2O room temperature phase-change material phase transformation temperature range is 18.4~24.4
DEG C, mistake
Cold degree variation range is 0.6~14.5 DEG C, and latent heat of phase change variation range is 99.12~122.4J/g.
Preferably, the MgCl2·6H2O-CaCl2·6H2After O room temperature phase-change material circulation melts-solidifies 50 times, phase transformation
Latent heat keeps stablizing.
Compared with prior art, the beneficial effects of the present invention are:
(1) MgCl prepared by this method2·6H2O-CaCl2·6H2O phase-changing energy storage material is the preferable room temperature of application
Phase-changing energy storage material system, synthesis technology simple possible, repeatability are strong.
(2) hydroxyl carbon nano tube is added to MgCl by this method2·6H2O-CaCl2·6H2O phase-change material, hydroxyl
Carbon nano tube has hydroxyl group, this can be combined with the ion in phase-change material, helps to improve carbon nanotube and phase
The wettability for becoming storeroom, allows carbon nanotube is more permanent to be dispersed in phase-change material, increases whole system
Stability.
(3) hydroxyl carbon nano tube is added to MgCl by this method2·6H2O-CaCl2·6H2In O phase-change material, hydroxyl
Base carbon nano tube specific surface area is that phase-change material provides bigger heterogeneous nucleation interface and more nucleation sites, can
Heterogeneous nucleation occurs with promotion system, reduces nucleation barrier, and then reduce degree of supercooling.It is cooling to material using moisture recorder
Curve is recorded, and gradually increases additional amount when hydroxyl carbon nano tube is only added, system degree of supercooling gradually decreases, and works as additional amount
When for 0.75g, degree of supercooling is 9.1 DEG C.
(4) carbon nanotube have good heating conduction, can in phase-change material the superior heat conduction network of forming properties, from
And the heating conduction of system is improved, keep system more sensitive to temperature, reduce temperature hysteresis, improves phase-change material heat accumulation and put
The energy utilization efficiency of thermal process.Material cooling curve is recorded using moisture recorder, as seen from the figure, in initial temperature
With cooling conditions it is essentially identical in the case where, as hydroxyl carbon nano tube additional amount gradually increases, each group sample reach phase transformation
The time of point is gradually reduced.
(5) MgCl is added in hydroxyl carbon nano tube and inorganic salts simultaneously2·6H2O-CaCl2·6H2Conduct in O phase-change material
Composite nucleating agent can produce synergistic effect, collectively promote phase-change material nucleation, so that system degree of supercooling be made to significantly reduce.Using
Moisture recorder records material cooling curve, as CNTs, SrCO3、SrCl2·6H2The introduction volume of O be respectively 0.75g,
When 0.3g and 0.9g, system degree of supercooling is only 0.6 DEG C.
(6) had stronger using hydroxyl carbon nano tube-inorganic salts composite nucleating agent compared to the material for less adding nucleating agent
Heat storage capacity and good cyclical stability.As shown in Fig. 2, introducing 0.75g carbon nanotube-inorganic salts composite nucleating agent phase
Become the latent heat of phase change of material as 116.1J/g, carry out melting-solidify circulation 50 times, as shown in figure 3, latent heat of phase change is 113.5J/
g。
Detailed description of the invention
Fig. 1 is the cooling curve of the obtained phase-change accumulation energy system of embodiment 1；
Fig. 2 is the differential scanning calorimetric curve of the obtained phase-change accumulation energy system of embodiment 1；
Fig. 3 is the cooling curve of the obtained phase-change accumulation energy system of embodiment 2；
Fig. 4 is the differential scanning calorimetric curve of the obtained phase-change accumulation energy system of embodiment 2；
Fig. 5 is the cooling curve of the obtained phase-change accumulation energy system of embodiment 3；
Fig. 6 is the cooling curve of the obtained phase-changing energy storage material of embodiment 4；
Fig. 7 is the differential scanning calorimetric curve of the obtained phase-changing energy storage material of embodiment 4；
Fig. 8 is that the obtained phase-changing energy storage material of embodiment 4 carries out the differential scanning obtained after melting-solidifying test 50 times
Calorimetric curve.
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
Embodiment 1 (using hydroxyl carbon nano tube as nucleating agent)
(1) anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in deionized water, 60~100 DEG C are configured near saturated solution,
Suction filtration purification is carried out while hot, is stood at room temperature for 24 hours, is filtered removal liquid, is obtained the CaCl of high-purity2·6H2O、MgCl2·
6H2O crystal；
(2) CaCl of 22.5g and 7.5g are weighed respectively2·6H2O and MgCl2·6H2O crystal is heated to 60 in beaker
~100 DEG C, 10min is kept, is completely melt mixture；
(3) magnetic agitation 1-3h at 60~100 DEG C of system prepared step (2), 0.15g hydroxyl second is added in whipping process
Base cellulose as thickener and 0.75g hydroxyl carbon nano tube as nucleating agent, 40~50 DEG C of 1~2h of ultrasonic disperse, until
System is uniformly mixed, and finally obtains MgCl2·6H2O-CaCl2·6H2O room temperature phase-change energy-storage material.
As seen from Figure 1, the degree of supercooling for the phase-change accumulation energy system that embodiment 1 obtains is 14.5 DEG C, and transformation time is
165min, if Fig. 2 can be obtained, the latent heat of phase change for the phase-change accumulation energy system that embodiment 1 obtains is 111.1J/g.
Embodiment 2 is (with SrCl2·6H2O、SrCO3As nucleating agent)
(1) anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in deionized water, 60~100 DEG C are configured near saturated solution,
Suction filtration purification is carried out while hot, is stood at room temperature for 24 hours, is filtered removal liquid, is obtained the CaCl of high-purity2·6H2O、MgCl2·
6H2O crystal；
(2) CaCl of 22.5g and 7.5g are weighed respectively2·6H2O and MgCl2·6H2O crystal is heated to 60 in beaker
~100 DEG C, 10min is kept, is completely melt mixture；
(3) magnetic agitation 2h under the system high-temperature for preparing step (2), 0.15g thickener, high temperature are added in whipping process
Ultrasonic disperse 1h, until system is uniformly mixed；
(4) SrCl of 0.9g is weighed again2·6H2The SrCO of O and 0.3g3Step is added separately to as inorganic salts nucleating agent
(3) in the system prepared, magnetic agitation 2h under high temperature, high temperature ultrasonic disperses 1h, finally obtains MgCl2·6H2O-CaCl2·
6H2O phase-change accumulation energy system.
As seen from Figure 3, the degree of supercooling for the phase-change accumulation energy system that embodiment 2 obtains is 7.8 DEG C, transformation time 71min,
If Fig. 4 can be obtained, the latent heat of phase change for the phase-change accumulation energy system that embodiment 2 obtains is 122.4J/g.
Embodiment 3 (using hydroxyl carbon nano tube as nucleating agent, and changes the additional amount of hydroxyl carbon nano tube)
(1) anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in deionized water, 60~100 DEG C are configured near saturated solution,
Suction filtration purification is carried out while hot, is stood at room temperature for 24 hours, is filtered removal liquid, is obtained the CaCl of high-purity2·6H2O、MgCl2·
6H2O crystal；
(2) CaCl of 22.5g and 7.5g are weighed respectively2·6H2O and MgCl2·6H2O crystal is heated to 60 in beaker
~100 DEG C, 10min is kept, is completely melt mixture；
(3) magnetic agitation 1-3h at 60~100 DEG C of system prepared step (2), 0.15g hydroxyl second is added in whipping process
Base cellulose is as thickener and 0.00g, and 0.15g, 0.30g, 0.45g, 0.60g, 0.75g hydroxyl carbon nano tube is as nucleation
Agent, 40~50 DEG C of 1~2h of ultrasonic disperse finally obtain MgCl until system is uniformly mixed2·6H2O-CaCl2·6H2O room temperature
Phase-changing energy storage material.
As shown in Figure 5, when being added 0.00g, 0.15g, 0.30g, 0.45g, 0.60g, after the CNTs of 0.75g, the mistake of system
Cold degree is gradually reduced, and corresponds respectively to 15,14.5,13.6,9.4 and 9.1 DEG C, it can be seen that with hydroxylating carbon pipe mass fraction
Increase, phase-change material degree of supercooling illustrates that hydroxylating carbon pipe plays the role of nucleating agent in being gradually reduced trend.
Embodiment 4
(1) anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in deionized water, 60~100 DEG C are configured near saturated solution,
Suction filtration purification is carried out while hot, is stood at room temperature for 24 hours, is filtered removal liquid, is obtained the CaCl of high-purity2·6H2O、MgCl2·
6H2O crystal；
(2) CaCl of 22.5g and 7.5g are weighed respectively2·6H2O and MgCl2·6H2O crystal is heated to 60 in beaker
~100 DEG C, 10min is kept, is completely melt mixture；
(3) magnetic agitation 1-3h at 60~100 DEG C of system prepared step (2), 0.15g hydroxyl second is added in whipping process
Base cellulose as thickener and 0.75g hydroxyl carbon nano tube as nucleating agent, 40~50 DEG C of 1~2h of ultrasonic disperse, until
System is uniformly mixed；
(4) SrCl of 0.9g is weighed again2·6H2The SrCO of O and 0.3g3Step is added separately to as inorganic salts nucleating agent
(3) in the system prepared, magnetic agitation 1-3h at 60~100 DEG C, 40~50 DEG C of 1~2h of ultrasonic disperse finally obtain MgCl2·
6H2O-CaCl2·6H2O room temperature phase-change energy-storage material,.
It is 19.9 DEG C that the system phase transition temperature that embodiment 4 obtains, which can be obtained, by Fig. 6, and degree of supercooling is 0.6 DEG C, and transformation time is
41min.It is 116.1J/g that the system latent heat of phase change that embodiment 4 obtains, which can be obtained, by Fig. 7.
Above-mentioned sample carries out melting-solidifying test 50 times, fusing-is solidifying as shown in Figure 8 in the case where no external interference
Gu system latent heat of phase change is 113.5J/g after 50 times.
Embodiment 5
(1) anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in deionized water, 60~100 DEG C are configured near saturated solution,
Suction filtration purification is carried out while hot, is stood at room temperature for 24 hours, is filtered removal liquid, is obtained the CaCl of high-purity2·6H2O、MgCl2·
6H2O crystal；
(2) CaCl of 22.5g and 7.5g are weighed respectively2·6H2O and MgCl2·6H2O crystal is heated to 60 in beaker
~100 DEG C, 10min is kept, is completely melt mixture；
(3) magnetic agitation 1-3h at 60~100 DEG C of system prepared step (2), 0.15g carboxylic first is added in whipping process
Base cellulose as thickener and 0.75g hydroxyl carbon nano tube as nucleating agent, 40~50 DEG C of 1~2h of ultrasonic disperse, until
System is uniformly mixed；
(4) SrCl of 0.9g is weighed again2·6H2The SrCO of O and 0.3g3Step is added separately to as inorganic salts nucleating agent
(3) in the system prepared, magnetic agitation 1-3h at 60~100 DEG C, 40~50 DEG C of 1~2h of ultrasonic disperse finally obtain MgCl2·
6H2O-CaCl2·6H2O room temperature phase-change energy-storage material.
Test result shows the obtained MgCl of embodiment 32·6H2O-CaCl2·6H2O room temperature phase-change energy-storage material exists
Stable homogeneous state can not be kept in cooling procedure for a long time, there is lamination appearance, so the carboxymethyl cellulose in this system
Element is not a kind of suitable thickener.
Embodiment 6
(1) anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in deionized water, 60~100 DEG C are configured near saturated solution,
Suction filtration purification is carried out while hot, is stood at room temperature for 24 hours, is filtered removal liquid, is obtained the CaCl of high-purity2·6H2O、MgCl2·
6H2O crystal；
(2) CaCl of 22.5g and 7.5g are weighed respectively2·6H2O and MgCl2·6H2O crystal is heated to 60 in beaker
~100 DEG C, 10min is kept, is completely melt mixture；
(3) magnetic agitation 1-3h at 60~100 DEG C of system prepared step (2), 0.15g hydroxyl second is added in whipping process
Base cellulose as thickener and 0.45g hydroxyl carbon nano tube as nucleating agent, 40~50 DEG C of 1~2h of ultrasonic disperse, until
System is uniformly mixed；
(4) SrCl of 0.9g is weighed again2·6H2The SrCO of O and 0.3g3Step is added separately to as inorganic salts nucleating agent
(3) in the system prepared, magnetic agitation 2h under high temperature, 40~50 DEG C of 1~2h of ultrasonic disperse finally obtain MgCl2·6H2O-
CaCl2·6H2O room temperature phase-change energy-storage material.
The experimental results showed that MgCl2·6H2O-CaCl2·6H2The phase transition temperature of O room temperature phase-change energy-storage material is 22.1
DEG C, degree of supercooling is 5.8 DEG C, transformation time 65min.
Embodiment 7
(1) anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in deionized water, 60~100 DEG C are configured near saturated solution,
Suction filtration purification is carried out while hot, is stood at room temperature for 24 hours, is filtered removal liquid, is obtained the CaCl of high-purity2·6H2O、MgCl2·
6H2O crystal；
(2) CaCl of 22.5g and 7.5g are weighed respectively2·6H2O and MgCl2·6H2O crystal is heated to 60 in beaker
~100 DEG C, 10min is kept, is completely melt mixture；
(3) magnetic agitation 1-3h at 60~100 DEG C of system prepared step (2), 0.15g hydroxyl second is added in whipping process
Base cellulose is as thickener and 0.5g hydroxyl carbon nano tube as nucleating agent, 40~50 DEG C of 1~2h of ultrasonic disperse, until body
System is uniformly mixed；
(4) SrCl of 0.75g is weighed again2·6H2The SrCO of O and 0.5g3Step is added separately to as inorganic salts nucleating agent
(3) in the system prepared, magnetic agitation 1-3h at 60~100 DEG C, 40~50 DEG C of 1~2h of ultrasonic disperse finally obtain MgCl2·
6H2O-CaCl2·6H2O room temperature phase-change energy-storage material.
The experimental results showed that MgCl2·6H2O-CaCl2·6H2The phase transition temperature of O room temperature phase-change energy-storage material is 20.3
DEG C, degree of supercooling is 1.8 DEG C, transformation time 54min.
Embodiment 8
(1) anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in deionized water, 60~100 DEG C are configured near saturated solution,
Suction filtration purification is carried out while hot, is stood at room temperature for 24 hours, is filtered removal liquid, is obtained the CaCl of high-purity2·6H2O、MgCl2·
6H2O crystal；
(2) CaCl of 22.5g and 7.5g are weighed respectively2·6H2O and MgCl2·6H2O crystal is heated to 60 in beaker
~100 DEG C, 10min is kept, is completely melt mixture；
(3) magnetic agitation 1-3h at 60~100 DEG C of system prepared step (2), 0.15g hydroxyl second is added in whipping process
Base cellulose as thickener and 0.75g hydroxyl carbon nano tube as nucleating agent, 40~50 DEG C of 1~2h of ultrasonic disperse, until
System is uniformly mixed；
(4) SrCl of 0.3g is weighed again2·6H2The SrCO of O and 0.1g3Step is added separately to as inorganic salts nucleating agent
(3) in the system prepared, magnetic agitation 1-3h at 60~100 DEG C, 40~50 DEG C of 1~2h of ultrasonic disperse finally obtain MgCl2·
6H2O-CaCl2·6H2O room temperature phase-change energy-storage material.
The experimental results showed that MgCl2·6H2O-CaCl2·6H2The phase transition temperature of O room temperature phase-change energy-storage material is 22.8
DEG C, degree of supercooling is 7.1 DEG C, transformation time 72min.
The above is only a preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of preparation method of room temperature phase-change energy-storage material, which comprises the following steps:
(1) CaCl is weighed respectively2·6H2O and MgCl2·6H2O crystal, heating, is completely melt mixture；
(2) magnetic agitation 1-3h at 60~100 DEG C of system prepared step (2), thickener and hydroxyl are added in whipping process
Carbon nano tube, 40~50 DEG C of 1~2h of ultrasonic disperse, until system be uniformly mixed, the thickener be hydroxyethyl cellulose or
Polyacrylamide；
(3) SrCl is weighed again2·6H2O and SrCO3The system of step (3) preparation is added separately to collectively as inorganic salts nucleating agent
In, in which: magnetic agitation 1-3h at 60~100 DEG C, 40~50 DEG C of 1~2h of ultrasonic disperse finally obtain MgCl2·6H2O-
CaCl2·6H2O room temperature phase-change energy-storage material；
Wherein: it is 0~0.5% that mass fraction, which is added, as nucleating agent in hydroxyl carbon nano tube in step (2), i.e. hydroxylating carbon is received
The quality of mitron is in MgCl2·6H2O-CaCl2·6H20~0.5% is accounted in O room temperature phase-change energy-storage material；
SrCO in step (3)3SrCl2·6H2O and SrCO3It is i.e. SrCO that total mass fraction, which is added,3SrCl2·6H2O and SrCO3's
Quality is in MgCl2·6H2O-CaCl2·6H20~5% is accounted in O room temperature phase-change energy-storage material.
2. a kind of preparation method of room temperature phase-change energy-storage material as described in claim 1, which is characterized in that the step (1)
In CaCl2·6H2O and MgCl2·6H2O crystal is prepared by following steps: anhydrous calcium chloride, anhydrous magnesium chloride are dissolved in
In deionized water, 60~100 DEG C are configured near saturated solution, carry out suction filtration purification while hot, are stood for 24 hours at room temperature, filter removal
Liquid obtains the CaCl of high-purity2·6H2O、MgCl2·6H2O crystal.
3. a kind of preparation method of room temperature phase-change energy-storage material as described in claim 1, which is characterized in that the step (1)
In CaCl2·6H2O and MgCl2·6H2O crystal quality ratio is (1:5)~(5:1).
4. a kind of preparation method of room temperature phase-change energy-storage material as described in claim 1, which is characterized in that the step (3)
In SrCl2·6H2O and SrCO3Mass ratio is (1:5)~(5:1).
5. a kind of preparation method of room temperature phase-change energy-storage material as described in claim 1, which is characterized in that the reaction system
Middle CaCl2·6H2O and MgCl2·6H2The additional amount of O crystal is respectively 71.81wt.% and 23.94wt.%, i.e. CaCl2·
6H2O and MgCl2·6H2The quality of O crystal is in MgCl2·6H2O-CaCl2·6H2It is accounted in O room temperature phase-change energy-storage material
71.81wt.% and 23.94wt.%, hydroxyl carbon nano tube, SrCO3And SrCl2·6H2O additional amount be respectively 0.25wt.%,
1wt.% and 3wt.%, i.e. hydroxyl carbon nano tube, SrCO3And SrCl2·6H2O is in MgCl2·6H2O-CaCl2·6H2O room temperature
0.25wt.%, 1wt.% and 3wt.% are accounted in phase-changing energy storage material.
6. a kind of pass through a kind of MgCl of the preparation method preparation of room temperature phase-change energy-storage material as described in claim 12·
6H2O-CaCl2·6H2O room temperature phase-change material.
7. a kind of such as MgCl as claimed in claim 72·6H2O-CaCl2·6H2O room temperature phase-change material, which is characterized in that institute
State MgCl2·6H2O-CaCl2·6H2The hydroxyl carbon nano tube for being 0~0.5% containing mass fraction in O room temperature phase-change material
The SrCl that nucleating agent and total mass fraction are 0~5%2·6H2O and SrCO3Inorganic salts nucleating agent.
8. a kind of such as MgCl as claimed in claim 72·6H2O-CaCl2·6H2O room temperature phase-change material, which is characterized in that
The MgCl2·6H2O-CaCl2·6H2In O room temperature phase-change material, CaCl2·6H2O and MgCl2·6H2O crystal quality score point
Not Wei 71.81wt.% and 23.94wt.%, the mass fractions of hydroxylating carbon nanotube nucleating agents is 0.25wt.%, SrCO3's
Mass fraction is 1wt.%, SrCl2·6H2The mass fraction of O is 3wt.%.
9. a kind of such as MgCl as claimed in claim 72·6H2O-CaCl2·6H2O room temperature phase-change material, which is characterized in that institute
State MgCl2·6H2O-CaCl2·6H2O room temperature phase-change material phase transformation temperature range is 18.4~24.4 DEG C, degree of supercooling variation range
It is 0.6~14.5 DEG C, latent heat of phase change variation range is 99.12~122.4J/g.
10. a kind of such as MgCl as claimed in claim 72·6H2O-CaCl2·6H2O room temperature phase-change material, which is characterized in that institute
State MgCl2·6H2O-CaCl2·6H2After O room temperature phase-change material circulation melts-solidify 50 times, latent heat of phase change keeps stablizing.
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