CN110257017A - Fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material and preparation method thereof - Google Patents
Fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of fatty acid/attapulgite modified/expanded graphite composite phase-changing materials and preparation method thereof, belong to energy saving phase-changing energy storage material field.The present invention is using cheap attapulgite as phase-change material carrier, adding the high porous inorganic material expanded graphite of thermal coefficient improves heating conduction, fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material is prepared, the problem of fatty acid-based phase-change material heating conduction difference is greatly improved.Preparation process of the present invention is simple and efficient, and raw material is cheap and easy to get, has preferable economic benefit and wide application prospect, can be widely used in phase-change material field.Phase-changing energy storage material of the present invention has excellent heating conduction and thermal stability, using attapulgite as phase transformation carrier with fatty acid phase-change material is compound prepares setting phase change energy storage material, liquid phase fatty acid can be effectively prevented to leak, a kind of setting phase change energy storage material with high-thermal conductivity of high quality is obtained, capacity usage ratio is significantly improved.
Description
Technical field
The present invention relates to a kind of phase-change heat-storage material and preparation method thereof, especially a kind of composite shape-stabilized phase change energy storage material
And preparation method thereof, it is applied to energy saving technical field of phase-change energy storage.
Background technique
Thermal energy storage is in energy technology in occupation of extremely important status.Thermal energy storage includes sensible heat storage and latent heat again
Storage, wherein latent heat storage is also known as phase-change accumulation energy, is to achieve the purpose that thermal energy storage by the phase transformation of material itself.Phase transformation storage
Can material energy storage density is big and the temperature and energy of output are quite stable, using phase-change accumulation energy can also solve energy supply and demand when
Between and spatially unmatched contradiction, be the effective means for improving capacity usage ratio.
Fatty acid has the fusing point for being suitable for accumulation of heat application, is not susceptible to mutually separate, and degree of supercooling is small, at low cost, corrosivity is small,
It is nonflammable, have reversible fusing and solidifiability, thermal stability is good, is good phase-change heat-storage material.Fatty acid conduct simultaneously
Ideal energy storage material, there is also following two large problems:
First is that the heating conduction of fatty acid is poor, for the heating conduction for improving phase-change material, usually in composite phase change energy-storing
Foam metal, graphite, carbon fiber etc. are added in material, thus improve heat reservoir storage, exothermic rate；
Second is that easily there is the problem of liquid phase leakage during solid-liquid phase change in fatty acid phase-change material.
Common solution is by fatty acid and the compound obtained composite shape-stabilized phase change energy storage material of inorganic porous material.Nothing
Phase-change material is effectively adsorbed in duct by the surface tension in duct, Hyarogen-bonding and capillary force by machine porous material
In, so that liquid phase phase-change material is difficult to happen leakage.Common inorganic porous material has expanded perlite, active carbon, montmorillonite, swollen
Swollen vermiculite etc., but have no the relevant report of the compound obtained setting phase change energy storage material with high-thermal conductivity of fatty acid.
Summary of the invention
In order to solve prior art problem, it is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind
Fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material and preparation method thereof improves fatty acid-based phase transformation material
Material heating conduction is prepared a kind of using attapulgite modified/expanded graphite as composite material inorganic carrier using melt mixing methods
Fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, phase-changing energy storage material of the present invention have excellent thermally conductive
Performance and thermal stability, using attapulgite as phase transformation carrier with fatty acid phase-change material is compound prepares fixed phase change energy storage material
Material, can be effectively prevented liquid phase fatty acid and leak, obtain a kind of setting phase change energy storage material with high-thermal conductivity of high quality,
Significantly improve capacity usage ratio.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, with attapulgite modified and expansion
The composite material of graphite, the inorganic carrier as phase-change material；Fatty acid is adsorbed on formation fatty acid/modification on inorganic carrier
Attapulgite/expanded graphite composite phase-changing material；And using expanded graphite as the passage of heat of phase-change material, the fatty acid is adopted
With unary fatty acid substance or polyhydric aliphatic acid eutectic mixture.
As optimal technical scheme of the present invention, the composition calculated according to weight percent are as follows: the fatty acid is 40-
65%, attapulgite modified 40-55%, expanded graphite 5-10%.
Above-mentioned unary fatty acid preferably uses myristic acid, palmitinic acid, stearic acid, lauric acid, any one in capric acid.
Above-mentioned polyhydric aliphatic acid eutectic mixture preferably use myristic acid, palmitinic acid, stearic acid, lauric acid, in capric acid
The eutectic mixture of any several unary fatty acids, and the kind according to the selection of required phase transition temperature for mixed unary fatty acid
Class.
Above-mentioned polyhydric aliphatic acid eutectic mixture preferably uses the binary eutectic mixture of myristic acid and palmitinic acid；
Above-mentioned polyhydric aliphatic acid eutectic mixture preferably uses the ternary eutectic of lauric acid, myristic acid and palmitinic acid to mix
Object；
Above-mentioned polyhydric aliphatic acid eutectic mixture preferably uses the quaternary of capric acid, lauric acid, myristic acid and palmitinic acid total
Brilliant mixture.
A kind of preparation method of fatty acid of the present invention/attapulgite modified/expanded graphite composite phase-changing energy storage material, step
It is as follows:
(1) weigh raw material according to following parts by weight: fatty acid 40-65%, attapulgite modified 40-55% expand stone
Black 5-10%；
(2) fusing will be added by weighed attapulgite modified and expanded graphite in the step (1)
Fatty acid in, formed mixture；Then it is being not less than fatty acid fusing point or polyhydric aliphatic acid eutectic mixture transformation temperature 20-30
At a temperature of DEG C, using vacuum suction method, fatty acid absorption is carried out；
When carrying out absorbing process, control vacuum degree is -0.10MPa, adsorption time 8-18h, every no more than 1-2h
Mixture is stirred once；
(3) after the absorbing process in the step (2), mixture is cooled to room temperature, solid-state material is frozen into,
Then solid-state material is crushed to be powdered, to obtain fatty acid/attapulgite modified/expanded graphite composite phase-changing material.
It is described attapulgite modified to make with the following method in the step (1) as optimal technical scheme of the present invention
Standby: using attapulgite and weight percent concentration is 5-30wt% acid solution as initial feed, and attapulgite is molten with acid
Proportion of the liquid by solid-to-liquid ratio for 1g:(8-10) ml is mixed, and is stirred at 50-70 DEG C, mixing time 1.5-
2.5h obtains uniformly mixed mixed liquor, then filters to mixed liquor, then is washed solid content to neutrality with ultrapure water,
Then solid content is dried in an oven with being not higher than at 110 DEG C, obtains solid product, solid product is then subjected to powder
It is broken, then obtained solid product is placed in crucible, calcining 1.5-2.5h is carried out in the Muffle furnace at not less than 750 DEG C, so
It will be sieved again after product cooling afterwards, to obtain attapulgite modified.When preparing attapulgite modified, above-mentioned acid solution
It is preferred that using hydrochloric acid solution, sulfuric acid solution or nitric acid solution.
As optimal technical scheme of the present invention, in the step (1), the expanded graphite is prepared with the following method:
Using expansible graphite as initial feed, 22-26h is dried under conditions of taking expansible graphite to be placed in 76-82 DEG C, then will
Expansible graphite after drying, which is put into micro-wave oven, carries out microwave treatment to get expanded graphite is arrived, as porous, inorganic heat conduction material
Material.
As optimal technical scheme of the present invention, in the step (2), first attapulgite modified and expanded graphite is carried out
It is uniformly mixed, attapulgite modified and expanded graphite composite material is obtained, as carrier material, then according to carrier material and rouge
The mass ratio of fat acid is that the ratio of 1:1 is mixed, and carries out absorbing process.
The principle of the invention:
The specific surface area of attapulgite is larger, up to 150~210m2/ g, some is up to 423m after modified processing2/ g, together
When also have the advantages that nontoxic, tasteless and nonirritant, cheap, chemical property is stable.Attapulgite plane of crystal containing activated centre and
Physical absorption and chemisorption can occur for Si-OH base, therefore can effective absorbing fats acid phase-change material.It is with attapulgite
Phase transformation carrier with fatty acid phase-change material is compound prepares setting phase change energy storage material, liquid phase fatty acid can be effectively prevented and let out
Leakage.For the heating conduction for further enhancing attapulgite based phase-change material, it is added to a certain amount of expanded graphite, to prepare
Fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material that a kind of hot property is stable, heating conduction is strong.
The present invention compared with prior art, has following obvious prominent substantive distinguishing features and remarkable advantage:
1. the present invention is using cheap attapulgite as phase-change material carrier, the high porous inorganic material of addition thermal coefficient
Expanded graphite improves heating conduction, prepares fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, greatly
Improve the problem of fatty acid-based phase-change material heating conduction difference；
2. the present invention carries out sour modification, heat modification to attapulgite, it can greatly improve attapulgite porosity, increase it
Specific surface area, enhancing attapulgite carry out phase-change material fatty acid well packaged to the absorption property of fatty acid, prevent liquid phase
Leakage problem；
3. the method for the present invention preparation process is simple and efficient, raw material is cheap and easy to get, has preferable economic benefit and wide
Application prospect can be widely used in phase-change material field.
Specific embodiment
Above scheme is described further below in conjunction with specific implementation example, the preferred embodiment of the present invention is described in detail such as
Under:
Embodiment one:
In the present embodiment, a kind of fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, with modification
The composite material of attapulgite and expanded graphite, the inorganic carrier as phase-change material；Fatty acid is adsorbed on inorganic carrier
Form fatty acid/attapulgite modified/expanded graphite composite phase-changing material；And it is thermally conductive logical using expanded graphite as phase-change material
Road, fatty acid use myristic acid unary fatty acid, the composition calculated according to weight percent are as follows: the myristic acid is
50%, attapulgite modified 45.45%, expanded graphite 4.55%, i.e. attapulgite modified and expanded graphite in 10:1 ratio into
Row proportion.
A kind of preparation method of the present embodiment fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, step
It is rapid as follows:
A. using attapulgite and weight percent concentration is 5wt% hydrochloric acid solution as initial feed, by attapulgite
It is mixed with hydrochloric acid solution by the proportion that solid-to-liquid ratio is 1g:10ml, stirs 2h at 60 DEG C, be uniformly mixed
Mixed liquor, then mixed liquor is filtered, then solid content is washed to neutrality, then by solid content in baking oven with ultrapure water
In to be dried at 110 DEG C, obtain solid product, then crush solid product, then obtained solid product is set
In crucible, calcining 2h is carried out in the Muffle furnace at 750 DEG C, then will be sieved again after product cooling, to be changed
Property attapulgite, as carrier matrix material；
B. 26h is dried under conditions of taking expansible graphite to be placed in 76 DEG C as initial feed using expansible graphite,
The expansible graphite after drying is put into micro-wave oven again and carries out microwave treatment, the power for controlling microwave treatment is 600W, processing
Time is 42s to get expanded graphite is arrived, as porous, inorganic Heat Conduction Material；The modified attapulgite that will be prepared in the step a
Soil and expanded graphite are uniformly mixed according to the ratio that mass ratio is 10:1, obtain attapulgite modified and expanded graphite composite wood
Material, as carrier material；
C. it weighs 15g myristic acid and is placed in beaker, place the beaker and heated in 80 DEG C of water-baths, make myristic acid in beaker
Melt, temperature constant magnetic stirring 0.5h, the attapulgite modified and expanded graphite composite wood that 15g is prepared in the step b is added
Material continues temperature constant magnetic stirring 0.5h, then uses vacuum suction method, places the beaker vacuum oven and carries out vacuum suction,
Make vacuum degree -0.1MPa, adsorb 8h at 75 DEG C, it is primary to take out beaker hand operated mixing every 1h；After absorption, it is cooled to room
Temperature, it is powdered for crushing, and obtains myristic acid/attapulgite modified/expanded graphite composite phase-changing material.
It is sample one by myristic acid manufactured in the present embodiment/attapulgite modified/exfoliated-graphite composite.
Embodiment two:
The present embodiment is basically the same as the first embodiment, and is particular in that:
In the present embodiment, a kind of fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, with modification
The composite material of attapulgite and expanded graphite, the inorganic carrier as phase-change material；Fatty acid is adsorbed on inorganic carrier
Form fatty acid/attapulgite modified/expanded graphite composite phase-changing material；And it is thermally conductive logical using expanded graphite as phase-change material
Road, the binary of fatty acids that fatty acid uses mass ratio to mix for the myristic acid of 65:35 and palmitinic acid, according to percent by weight
The composition of calculation are as follows: the binary of fatty acids is 50%, attapulgite modified 45.45%, expanded graphite 4.55%, i.e., modified concave-convex
Stick soil and expanded graphite are matched in 10:1 ratio.
A kind of preparation method of the present embodiment fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, step
It is rapid as follows:
A. this step is the same as example 1；
B. this step is the same as example 1；
C. the proportion that myristic acid, palmitinic acid are 65:35 in mass ratio is uniformly mixed in beaker, places the beaker 75
It being heated in DEG C water-bath, melts myristic acid and palmitinic acid in beaker all, temperature constant magnetic stirring 1.5h mixes fatty acid,
The attapulgite modified and exfoliated-graphite composite that 15g is prepared in the step b is added, continues temperature constant magnetic stirring
Then 0.5h uses vacuum suction method, place the beaker vacuum oven and carry out vacuum suction, make vacuum degree -0.1MPa, and 75
12h is adsorbed at DEG C, it is primary to take out beaker hand operated mixing every 1h；It after absorption, is cooled to room temperature, it is powdered for crushing, and is obtained
To binary of fatty acids/attapulgite modified/expanded graphite composite phase-changing material.
It is sample two by binary of fatty acids manufactured in the present embodiment/attapulgite modified/exfoliated-graphite composite.
Embodiment three:
The present embodiment is substantially the same as in the previous example, and is particular in that:
In the present embodiment, a kind of fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, with modification
The composite material of attapulgite and expanded graphite, the inorganic carrier as phase-change material；Fatty acid is adsorbed on inorganic carrier
Form fatty acid/attapulgite modified/expanded graphite composite phase-changing material；And it is thermally conductive logical using expanded graphite as phase-change material
Road, fatty acid uses mass ratio sour for the lauric acid of 35:20:45, myristic acid, the ternary aliphatic of palmitinic acid mixing, according to weight
Measure the composition that percentage calculates are as follows: the ternary aliphatic acid is 50%, attapulgite modified 45.45%, expanded graphite 4.55%,
I.e. attapulgite modified and expanded graphite is matched in 10:1 ratio.
A kind of preparation method of the present embodiment fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, step
It is rapid as follows:
A. this step is the same as example 1；
B. this step is the same as example 1；
C. the proportion that lauric acid, myristic acid, palmitinic acid are 35:20:45 in mass ratio is uniformly mixed in beaker, it will
Beaker is placed in 75 DEG C of water-baths and heats, and melts myristic acid and palmitinic acid in beaker all, and temperature constant magnetic stirring 2.0h makes rouge
Fat acid-mixed is closed, and the attapulgite modified and exfoliated-graphite composite that 15g is prepared in the step b is added, and continues constant temperature magnetic
Power stirs 1h, then uses vacuum suction method, places the beaker vacuum oven and carries out vacuum suction, makes vacuum degree-
0.1MPa adsorbs 18h at 75 DEG C, and it is primary to take out beaker hand operated mixing every 2h；It after absorption, is cooled to room temperature, crushes and be
It is powdered, obtain ternary aliphatic acid/attapulgite modified/expanded graphite composite phase-changing material.
It is sample three by ternary aliphatic acid/attapulgite modified/exfoliated-graphite composite manufactured in the present embodiment.
Example IV:
The present embodiment is substantially the same as in the previous example, and is particular in that:
A kind of fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, with attapulgite modified and expansion
The composite material of graphite, the inorganic carrier as phase-change material；Fatty acid is adsorbed on formation fatty acid/modification on inorganic carrier
Attapulgite/expanded graphite composite phase-changing material；And using expanded graphite as the passage of heat of phase-change material, fatty acid uses meat
Myristic acid unary fatty acid, the composition calculated according to weight percent are as follows: the myristic acid is 50%, attapulgite modified
45.45%, expanded graphite 4.55%, i.e., attapulgite modified and expanded graphite is matched in 10:1 ratio.
A kind of preparation method of the present embodiment fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, step
It is rapid as follows:
A. using attapulgite and weight percent concentration is 30wt% hydrochloric acid solution as initial feed, by attapulgite
It is mixed with hydrochloric acid solution by the proportion that solid-to-liquid ratio is 1g:8ml, stirs 2.5h at 50 DEG C, it is equal to obtain mixing
Even mixed liquor, then filters mixed liquor, then is washed solid content to neutrality with ultrapure water, is then drying solid content
To be dried at 110 DEG C in case, solid product is obtained, then crushes solid product, then the solid product that will be obtained
It is placed in crucible, calcining 2.5h is carried out in the Muffle furnace at 750 DEG C, then will be sieved again after product cooling, thus
To attapulgite modified, as carrier matrix material；
B. 22h is dried under conditions of taking expansible graphite to be placed in 82 DEG C as initial feed using expansible graphite,
The expansible graphite after drying is put into micro-wave oven again and carries out microwave treatment, the power for controlling microwave treatment is 600W, processing
Time is 42s to get expanded graphite is arrived, as porous, inorganic Heat Conduction Material；The modified attapulgite that will be prepared in the step a
Soil and expanded graphite are uniformly mixed according to the ratio that mass ratio is 10:1, obtain attapulgite modified and expanded graphite composite wood
Material, as carrier material；
C. this step is the same as example 1.
It is sample four by myristic acid manufactured in the present embodiment/attapulgite modified/exfoliated-graphite composite.
Embodiment five:
The present embodiment is substantially the same as in the previous example, and is particular in that:
A kind of fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, with attapulgite modified and expansion
The composite material of graphite, the inorganic carrier as phase-change material；Fatty acid is adsorbed on formation fatty acid/modification on inorganic carrier
Attapulgite/expanded graphite composite phase-changing material；And using expanded graphite as the passage of heat of phase-change material, fatty acid uses meat
Myristic acid unary fatty acid, the composition calculated according to weight percent are as follows: the myristic acid is 50%, attapulgite modified
45.45%, expanded graphite 4.55%, i.e., attapulgite modified and expanded graphite is matched in 10:1 ratio.
A kind of preparation method of the present embodiment fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, step
It is rapid as follows:
A. using attapulgite and weight percent concentration is 30wt% hydrochloric acid solution as initial feed, by attapulgite
It is mixed with hydrochloric acid solution by the proportion that solid-to-liquid ratio is 1g:8ml, stirs 1.5h at 70 DEG C, it is equal to obtain mixing
Even mixed liquor, then filters mixed liquor, then is washed solid content to neutrality with ultrapure water, is then drying solid content
To be dried at 110 DEG C in case, solid product is obtained, then crushes solid product, then the solid product that will be obtained
It is placed in crucible, calcining 1.5h is carried out in the Muffle furnace at 750 DEG C, then will be sieved again after product cooling, thus
To attapulgite modified, as carrier matrix material；
B. this step is the same as example 1；
C. this step is the same as example 1.
It is sample five by myristic acid manufactured in the present embodiment/attapulgite modified/exfoliated-graphite composite.
Test test analysis
Five fatty acid made from above-described embodiment/attapulgite modified/expanded graphite composite phase-changing material sample is taken, with
And phase-change material sample six, the binary of fatty acids myristic acid/palmitinic acid phase transformation material of existing single fat acid myristic acid
Expect sample seven and ternary aliphatic acid lauric acid/myristic acid/palmitinic acid phase-change material sample eight.To sample one, sample two, sample
Product three, sample four, sample five, sample six, sample seven, the phase transition temperature of sample eight, storage/discharge heat content, heating conduction are detected
Comparison carries out 500 storage/discharge thermal cycle experiments to sample one, two, three, four, five, measures the heat of composite material after repeatedly circulation
The variation of performance.
It is found that the phase transition temperature of sample one, two, three, four, five is respectively lower than sample six, seven, eight, and answered with engineering construction
It is close with temperature, it is expected to be applied in practical construction material；The storage/discharge with sample six, seven, eight of sample one, two, three, four, five
The ratio of heat content is slightly larger than composition ratio shared by composite material fatty acid, this is because expanded graphite has excellent thermal conductivity, pole
Big enhances the heating conduction of composite material；The phase alternating temperature of sample one, two, three, four, five is measured after 500 storage/discharge thermal cycles
The phase transition temperature of sample, storage/discharge heat content are not much different before degree, storage/discharge heat content, with circulation, illustrate the thermal stability of composite material
Preferably.
In conclusion above-described embodiment fatty acid/attapulgite modified/expanded graphite composite phase-changing material and its preparation side
Method, using cheap attapulgite as phase-change material carrier, the high porous inorganic material expanded graphite of addition thermal coefficient improves
Heating conduction prepares fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, greatly improves fatty acid
The problem of based phase-change material heating conduction difference.The above embodiment of the present invention preparation process is simple and efficient, and raw material is cheap and easy to get, is had
Preferable economic benefit and wide application prospect, can be widely used in phase-change material field.
The embodiment of the present invention is illustrated above, but the present invention is not limited to the above embodiments, it can also be according to this hair
The purpose of bright innovation and creation makes a variety of variations, and that does under the Spirit Essence and principle of all technical solutions according to the present invention changes
Become, modification, substitution, combination or simplified, should be equivalent substitute mode, as long as meeting goal of the invention of the invention, as long as not
Away from the technical principle of fatty acid of the present invention/attapulgite modified/expanded graphite composite phase-changing energy storage material and preparation method thereof
And inventive concept, belong to protection scope of the present invention.
Claims (10)
1. a kind of fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, it is characterised in that: with modified concave-convex
The composite material of stick soil and expanded graphite, the inorganic carrier as phase-change material；Fatty acid is adsorbed on inorganic carrier and is formed
Fatty acid/attapulgite modified/expanded graphite composite phase-changing material；And using expanded graphite as the passage of heat of phase-change material,
The fatty acid uses unary fatty acid substance or polyhydric aliphatic acid eutectic mixture.
2. fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, feature exist according to claim 1
In: the composition calculated according to weight percent are as follows: the fatty acid is 40-65%, attapulgite modified 40-55%, expands stone
Black 5-10%.
3. fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, feature exist according to claim 1
In: the unary fatty acid be myristic acid, palmitinic acid, stearic acid, lauric acid, any one in capric acid.
4. fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, feature exist according to claim 1
In: the polyhydric aliphatic acid eutectic mixture be myristic acid, palmitinic acid, stearic acid, lauric acid, any several unitary in capric acid
The eutectic mixture of fatty acid, and mixed unary fatty acid type is used for according to the selection of required phase transition temperature.
5. fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material, feature exist according to claim 4
In: the polyhydric aliphatic acid eutectic mixture uses the binary eutectic mixture of myristic acid and palmitinic acid；Alternatively, using laurel
The ternary eutectic mixture of acid, myristic acid and palmitinic acid；Alternatively, using the four of capric acid, lauric acid, myristic acid and palmitinic acid
First eutectic mixture.
6. a kind of fatty acid described in claim 1/attapulgite modified/expanded graphite composite phase-changing energy storage material preparation side
Method, which comprises the steps of:
(1) raw material is weighed according to following parts by weight: fatty acid 40-65%, attapulgite modified 40-55%, expanded graphite 5-
10%；
(2) rouge melted will be added by weighed attapulgite modified and expanded graphite in the step (1)
In fat acid, mixture is formed；Then not less than 20-30 DEG C of transformation temperature of fatty acid fusing point or polyhydric aliphatic acid eutectic mixture
At a temperature of, using vacuum suction method, carry out fatty acid absorption；
When carrying out absorbing process, control vacuum degree is -0.10MPa, adsorption time 8-18h, every being no more than 1-2h to mixed
Object is closed to be stirred once；
(3) after the absorbing process in the step (2), mixture is cooled to room temperature, is frozen into solid-state material, then
Solid-state material is crushed to be powdered, to obtain fatty acid/attapulgite modified/expanded graphite composite phase-changing material.
7. fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material preparation side according to claim 6
Method, it is characterised in that: described attapulgite modified to prepare with the following method in the step (1): using attapulgite and
Weight percent concentration is 5-30wt% acid solution as initial feed, and it is 1g:(8- that attapulgite and acid solution, which are pressed solid-to-liquid ratio,
10) proportion of ml is mixed, and is stirred at 50-70 DEG C, and mixing time 1.5-2.5h is obtained uniformly mixed
Then mixed liquor filters mixed liquor, then washed solid content to neutrality with ultrapure water, then in an oven by solid content
It is dried with being not higher than at 110 DEG C, obtains solid product, then crush solid product, then obtained solid is produced
Object is placed in crucible, carries out calcining 1.5-2.5h in the Muffle furnace at not less than 750 DEG C, then will be carried out again after product cooling
Sieving, to obtain attapulgite modified.
8. fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material preparation side according to claim 7
Method, it is characterised in that: when preparing attapulgite modified in the step (1), the acid solution is molten using hydrochloric acid solution, sulfuric acid
Liquid or nitric acid solution.
9. fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material preparation side according to claim 6
Method, it is characterised in that: in the step (1), the expanded graphite is prepared with the following method: expansible graphite conduct is used
Initial feed, is dried 22-26h under conditions of taking expansible graphite to be placed in 76-82 DEG C, then by the expansible graphite after drying
It is put into micro-wave oven and carries out microwave treatment to get expanded graphite is arrived, as porous, inorganic Heat Conduction Material.
10. fatty acid/attapulgite modified/expanded graphite composite phase-changing energy storage material preparation side according to claim 6
Method, it is characterised in that: in the step (2), first attapulgite modified and expanded graphite is carried out uniformly mixed, must be modified recessed
Then the composite material of convex stick soil and expanded graphite is 1:1 according to the mass ratio of carrier material and fatty acid as carrier material
Ratio mixed, carry out absorbing process.
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