CN108531136A - A kind of high efficiency composition phase-change material and preparation method thereof - Google Patents
A kind of high efficiency composition phase-change material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of high efficiency composition phase-change material and preparation method thereof, the high efficiency composition phase-change material is by thermal medium 96.5% 75%；Nucleating agent 0.5% 3%；Thickener 3% 7%；Efficiently leading can agent 1 15%；Fusing point conditioning agent 0.1 10% forms, and thermal medium is mixed in proportion by one or more of aqueous solutions such as inorganic salts sodium sulphate, sodium carbonate, calcium chloride or lithium bromide；Nucleating agent is six water strontium chlorides, potassium chloride, sodium borate decahydrate, barium sulfate or calcirm-fluoride any of which；Thickener is that diatomite, attapulgite, polyacrylamide, carboxymethyl cellulose one of which or several arbitrary proportions are mixed；Efficiently leading energy additive is:(a) metal class filler, (b) carbons filler, (c) ceramic-like filler；Fusing point conditioning agent is ammonium chloride, ammonium sulfate, ammonium nitrate any of which.The present invention plays rapidly in 60s to 180s and leads and can act on, and degree of supercooling is 1.5 DEG C.
Description
Technical field：
The present invention relates to phase-change material fields, more particularly, to a kind of high efficiency composition phase-change material and preparation method thereof.
Background technology：
More and more paid attention to by various countries with environmentally friendly with energy saving.Since the supply and demand gap of the energy is from increasingly
Greatly, in many energy utilization systems (such as solar energy, wind energy, carbon can the energy) there is uncoordinated, to cause energy
The irrationality utilized and a large amount of wastes.People are close several to the understanding of heat-storing material, especially phase change heat storage material and research
10 years things.Basis of the phase-changing energy storage material as energy storage technology, has at home and abroad obtained great development.Summarizing phase transformation
On the basis of the basic theories and present Research of energy storage material, using inorganic phase-changing material as research object, have close to room temperature
Phase transition temperature and it is cheap the advantages that, be mainly main former with sodium sulphate and in the inorganic salts cold-storage material developed now
Material, but its melting process, which belongs to non-homogeneous, to be melted, there are degree of supercooling height, stable circulation performance is poor, heat conductivility is poor, phase transformation
The problems such as temperature is non-adjustable, these factors, which result in phase change cold accumulating agent, cannot play its due effect.
To solve the above-mentioned problems, Authorization Notice No. is 103242806 B of CN, and patent name is inorganic salts phase change cold-storage
The Chinese invention patent of material provides a kind of Inorganic salt phase-change cold accumulation material, is made of the raw material of following parts by weight：100
The thickening of a concentration of 15~25% inorganic salt solution of weight fraction, the Nucleating Agent, 2~15 weight fractions of 1~7 weight fraction
Agent.
Preferably, the inorganic salts are, one or more of sodium chloride, magnesium chloride, sodium nitrate.
Further, the Nucleating Agent is one or more of sodium tetraborate, silica.
Further, the thickener is one in Sodium Polyacrylate, sodium carboxymethylcellulose, bentonite, sodium alginate
Kind is a variety of.The addition of sodium tetraborate can effectively reduce the degree of supercooling of phase-change material for cold storage, and bentonite and poly- third is added
Olefin(e) acid sodium can effectively avoid Inorganic salt phase-change cold accumulation material from phenomenon of phase separation occur, improve phase transformation stable circulation performance.
Inorganic salts are as inorganic phase-changing material, advantage：1, latent heat of phase change is high (can reach 200~400J/g)；2, it leads
Hot coefficient is good (comparing organic phase-changing energy storage material)；3, nontoxic, the aobvious neutrality of pH value；4, cheap.The nothing that the invention provides
Machine salt phase-change material for cold storage has energy storage density height, mistake compared with existing technology (latent heat of phase change is in 100-200J/g ranges)
Small, the good advantage of stable circulation performance of cold degree.
But above-mentioned phase-change material, there are still leading that the time can be needed long, and leading can effect difference and the big (hair of degree of supercooling fluctuation
Bright degree of supercooling maximum is up to 2.5 DEG C) and phase separation phenomena such as, seriously constrain application value.
In addition, application publication number is 103666381 A of CN, patent name is a kind of patent application of phase-changing energy storage material,
It is related to a kind of phase-changing energy storage material, including energy storage material of main part, thickener, nucleating agent and reinforcing material, mass percentage
For：Energy storage material of main part 75%-99%, thickener 0.1%-10%, nucleating agent 0.2%-15%, reinforcing material 0.01%-
8%, energy storage material of main part is the crystallization water and salt, and thickener is by inorganic thickening agent, fiber-like, polyacrylate, polyurethanes
And one or more compositions in natural polymer subclass thickener, nucleating agent is by sodium pyrophosphate, ten water sodium phosphates, sulfate dihydrate
One or more compositions in calcium, potassium sulfate, potassium borate, barium hydroxide, disodium hydrogen phosphate, sodium sulphate, enhancing
Material is one or more compositions in metal and metal oxide powder, carbon material, nano-particle, foamed material；Nanoparticle
Son is one or more in copper nanoparticle, carbon nanotube etc.；Foamed material is foamy graphite, foam metal aluminium, foam copper etc.
In it is one or more.The present invention reduces degree of supercooling and phenomenon of phase separation, shows by choosing suitable material and proportioning
Good cyclical stability especially adds reinforcing material in system, heat conduction network is formed, so that the thermal conductivity of material
Improve 2 times or more.
But above-mentioned phase-change material, there are still lead that the problems such as time is long, phase transition temperature is non-adjustable can be needed.
Invention content：
The time can be needed in order to shorten leading for phase-changing energy storage material, it is improved and leads energy effect, reduce its degree of supercooling and avoid
Phenomenon of phase separation, while reaching the adjustable effect of phase transition temperature, the invention discloses a kind of high efficiency composition phase-change material, features
Be, the high efficiency composition phase-change material by thermal medium, nucleating agent, thickener, efficiently lead can additive and fusing point conditioning agent form,
Its ratio be：
Thermal medium：96.5%-75%；Nucleating agent：0.5%-3%；Thickener：3%-7%；Efficiently leading can agent：1-15%；
Fusing point conditioning agent：0.1-10%；
Wherein, the thermal medium by inorganic salts aqueous sodium persulfate solution, without disodium hydrogen phosphate aqueous solution, aqueous sodium carbonate,
The one or more aqueous solution such as calcium chloride water or lithium bromide water solution is mixed in any proportion.
The nucleating agent is that six water strontium chlorides, potassium chloride, sodium borate decahydrate, barium sulfate or calcirm-fluoride are therein any
It is a kind of；
The thickener is diatomite, attapulgite, polyacrylamide, one such or several of carboxymethyl cellulose
Meaning ratio is mixed；
The energy additive of efficiently leading is broadly divided into:(a) metal class filler：For metallic crystal, heat transfer is mainly logical
The displacement of a large amount of free electrons of crystals is crossed, therefore metallic crystal generally has higher thermal conductivity.Common metal
Filler has the powder such as Ag, Cu, Al, Mg, N.(b) carbons filler, such as amorphous carbon, carbon fiber, graphite, diamond, carbon nanotube
With graphene (c) ceramic-like filler, the most one kind for being, such as boron nitride (BN), aluminium nitride (AN), silicon nitride
(SiN4), silicon carbide (SiC), magnesia (MgO), beryllium oxide (BeO), aluminium oxide (Al203), zinc oxide (Zn0), silica
(SiO2) etc., any type therein, which can be used as, efficiently leads energy additive；
The fusing point conditioning agent is ammonium chloride, ammonium sulfate, ammonium nitrate any type therein.
High efficiency composition phase-change material made of the present invention, phase transformation system are effect improved apparent.By adding different additive
Different Effects are generated to inorganic phase-changing material, material lead can property play a role rapidly sensing in temperature 60s to the sections 180s,
Degree of supercooling is 1.5 DEG C, is occurred almost without problem of phase separation, and the ratio by changing fusing point conditioning agent, can reach phase transition temperature
Adjustable effect, produces application value.
Invention also provides a kind of preparation methods of high efficiency composition phase-change material, include the following steps：
A, 40-60 grams of inorganic salt particle is added in 100 grams of water, with 70 DEG C of -80 DEG C of sections, the stirring of 450rpm-1000rpm
Rate is uniformly mixed, and inorganic salt solution is made；
B, 0.5-3 grams of nucleating agent is added into inorganic salt solution made from step A, with 70 DEG C of -80 DEG C of sections,
The stir speed (S.S.) of 450rpm-1000rpm is uniformly mixed, obtained solution；
C, be added into solution made from step B 3-7 grams of thickener, efficiently lead can 1-15 grams of agent, fusing point conditioning agent be
0.1-10 grams, with 70 DEG C of -80 DEG C of sections, the stir speed (S.S.) of 3000rpm-8000rpm is uniformly mixed, and high efficiency composition phase transformation material is made
Material；
Specific implementation mode：
The present invention will be further described with reference to embodiments.
The composite phase-change material and preparation method thereof of the present invention, includes the following steps：
A, 40-60 grams of inorganic salt particle is added in 100 grams of water, with 70 DEG C of -80 DEG C of sections, the stirring of 450rpm-1000rpm
Rate is uniformly mixed, and thermal medium, i.e. inorganic salt solution is made；
B, 0.5-3 grams of nucleating agent is added into inorganic salt solution made from step A, with 70 DEG C of -80 DEG C of sections,
The stir speed (S.S.) of 450rpm-1000rpm is uniformly mixed, obtained solution；
C, be added into solution made from step B 3-7 grams of thickener, efficiently lead can 1-15 grams of agent, fusing point conditioning agent be
0.1-10 grams, with 70 DEG C of -80 DEG C of sections, the stir speed (S.S.) of 3000rpm-8000rpm is uniformly mixed, and high efficiency composition phase transformation material is made
Material.
The high efficiency composition phase-change material by thermal medium, nucleating agent, thickener, efficiently lead can additive and fusing point conditioning agent
By following mass percentage composition：Thermal medium：96.5%-75%；Nucleating agent：0.5%-3%；Thickener：3%-7%；Efficiently
Leading can agent：1-15%；Fusing point conditioning agent：0-10%；The thermal medium by inorganic salts aqueous sodium persulfate solution, aqueous sodium carbonate,
The one or more aqueous solution such as calcium chloride water or lithium bromide water solution is mixed in any proportion；The nucleating agent is six
Water strontium chloride, potassium chloride, sodium borate decahydrate, barium sulfate or calcirm-fluoride any type therein；The thickener is diatom
Soil, attapulgite, polyacrylamide, Sodium Polyacrylate, carboxymethyl cellulose be one such or several arbitrary proportions mixing system
At.
The energy additive of efficiently leading is broadly divided into:Metal class filler or carbons filler or ceramic-like filler；The metal
Class filler is Ag powder or Cu powder or Al powder or Mg powder or N powder any type therein；The carbons filler is nothing
Shape carbon, carbon fiber, graphite, diamond, carbon nanotube or graphene any type therein；The ceramic-like filler is nitridation
Boron (BN), aluminium nitride (AN), silicon nitride (SiN4), silicon carbide (SiC), magnesia (MgO), beryllium oxide (BeO), aluminium oxide
(Al203), zinc oxide (Zn0), silica (SiO2) any type therein.The fusing point conditioning agent is ammonium chloride, sulfuric acid
Ammonium, ammonium nitrate any type therein.
High efficiency composition phase-change material prepared by the present invention：Lead can property send out rapidly sensing in temperature 60s to the sections 180s
The effect of waving, effect are the most apparent；Degree of supercooling is 1.5 DEG C, and degree of supercooling is substantially reduced；Occur almost without phenomenon of phase separation, and
By changing the ratio of fusing point conditioning agent, the adjustable effect of phase transition temperature can reach.
Therefore nucleating agent, thickener, the efficient energy additive and fusing point conditioning agent of leading are the best methods for improving material phase transformation.
Embodiment 1
Step 1 takes 50 grams of anhydrous calcium chlorides, and constant temperature stirred autoclaves are added in 100 grams of water, with the stir speed (S.S.) of 500rpm,
After being heated to 70 DEG C, constant temperature stirs 30min obtained solutions；
1.5 gram of six water strontium chloride is added into the solution of step 1 for step 2, with the stir speed (S.S.) of 500rpm, 70 DEG C of temperature
Degree continues constant temperature and stirs 15min；
1.5 grams of polyacrylamides are added into the solution of step 2 for step 3, add 5.5 grams of attapulgites, with
The stir speed (S.S.) of 3000rpm, 70 DEG C of temperature continue constant temperature and stir 30min；
0.1 gram of ammonium chloride is added into the solution of step 3 for step 4, with the stir speed (S.S.) of 3000rpm, 70 DEG C of temperature,
Continue constant temperature and stir 5min,
1 gram of graphene is added into the solution of step 4 for step 5, and with the stir speed (S.S.) of 3000rpm, 70 DEG C of temperature is held
Continuous constant temperature stirs 15min, and high efficiency composition phase-change material is made.
Prepared material leads energy property and plays a role rapidly after sensing temperature 60s-70s.
Embodiment 2
Step 1 takes 49 grams without disodium hydrogen phosphate, and constant temperature stirred autoclave is added in 100 grams of water, with the stir speed (S.S.) of 450rpm
It is stirred mixing, is heated to 80 DEG C, constant temperature stirs 30min and aqueous solution is made；
2 grams of sodium borate decahydrates, with the stir speed (S.S.) of 450rpm, 80 DEG C are added into the solution of step 1 for step 2
Temperature continues constant temperature and stirs 15min；
1.5 grams of polyacrylamides are added into the solution of step 2 for step 3,5 grams of diatomite are added, with 3000rpm's
Stir speed (S.S.), 80 DEG C of temperature continue constant temperature and stir 30min；
0.1 gram of ammonium chloride is added into the solution of step 3 for step 4, and with the stir speed (S.S.) of 450rpm, 80 DEG C of temperature is held
Continuous constant temperature stirs 5min；
5 grams of graphite are added into the solution of step 4 for step 5, and with the stir speed (S.S.) of 450rpm, 80 DEG C of temperature continues perseverance
Temperature stirring 5min, is made high efficiency composition phase-change material.
Prepared material leads energy property and plays a role rapidly after sensing temperature 60s-85s.
Embodiment 3
Step 1 takes 45 grams of anhydrous sodium sulfates, and constant temperature stirred autoclaves are added in 100 grams of water, with the stir speed (S.S.) of 550rpm into
Row is stirred, and is heated to 80 DEG C, constant temperature stirs 35min and aqueous solution is made；
1.5 grams of barium sulfate stirrings are added into the solution of step 1 for step 2, with the stir speed (S.S.) of 550rpm, are heated to 80
DEG C, constant temperature stirs 10min；
2 grams of carboxymethyl celluloses are added into the solution of step 2 for step 3, add 5 grams of polyacrylamides, with
The stir speed (S.S.) of 3000rpm, 80 DEG C of temperature continue constant temperature and stir 30min；
0.1 gram of ammonium chloride is added into the solution of step 3 for step 4, and with the stir speed (S.S.) of 450rpm, 80 DEG C of temperature is held
Continuous constant temperature stirs 5min；
3 grams of silica are added into the solution of step 4 for step 5, with the stir speed (S.S.) of 3000rpm, 80 DEG C of temperature,
Continue constant temperature and stir 15min, high efficiency composition phase-change material is made.
Prepared material leads energy property and plays a role rapidly after sensing temperature 60s-120s.
Embodiment 4
Step 1 takes 45 grams of sodium carbonate, 100 grams of water that constant temperature stirred autoclave is added, with the stir speed (S.S.) of 500rpm, heating
To after 75 DEG C, constant temperature stirs 30min obtained solutions；
1.5 grams of calcirm-fluoride are added into the solution of step 1 for step 2, with the stir speed (S.S.) of 500rpm, after being heated to 75 DEG C,
Constant temperature stirs 20min obtained solutions；
Step 3, into the solution of step 2,6.5 grams of Sodium Polyacrylates of addition are heated to 75 with the stir speed (S.S.) of 3000rpm
After DEG C, constant temperature stirs 30min obtained solutions；
0.1 gram of ammonium chloride is added into the solution of step 3 for step 4, and with the stir speed (S.S.) of 450rpm, 80 DEG C of temperature is held
Continuous constant temperature stirs 5min；
3 grams of silica are added to the solution of step 4 in step 5, with the stir speed (S.S.) of 3000rpm, after being heated to 75 DEG C,
Constant temperature stirs 30min obtained solutions, and high efficiency composition phase-change material is made.
Prepared material leads energy property and plays a role rapidly after sensing temperature 60s-135s.
Embodiment 5
Step 1 takes 15 grams of sodium nitrate and 45 sodium carbonate, and 100 grams of water are added reaction kettle and are stirred, with stirring for 1000rpm
Rate is mixed, after being heated to 75 DEG C, constant temperature stirs 30min obtained solutions；
Step 2 is heated to 75 to the solution of step 13 grams of sodium borate decahydrates of addition with the stir speed (S.S.) of 1000rpm
After DEG C, constant temperature stirring 25min obtained solutions stir；
2 grams of carboxymethyl celluloses are added into the solution of step 2 for step 3, add 5 grams of polyacrylamides, with
The stir speed (S.S.) of 5000rpm, after being heated to 75 DEG C, constant temperature stirring 35min obtained solutions stir；
0.1 gram of ammonium chloride is added into the solution of step 3 for step 4, and with the stir speed (S.S.) of 450rpm, 80 DEG C of temperature is held
Continuous constant temperature stirs 5min；
10 grams of aluminium oxide are added into the solution of step 4 for step 5, with the stir speed (S.S.) of 5000rpm, after being heated to 75 DEG C,
Constant temperature stirring 25min obtained solutions stir, and high efficiency composition phase-change material is made.
Prepared material leads energy property and plays a role rapidly after sensing temperature 60s-150s.
The present invention generates Different Effects by adding different additive to inorganic phase-changing material, and material is led energy property and sensed
It plays a role rapidly in temperature 60s to the sections 180s, degree of supercooling is 1.5 DEG C, occurs almost without problem of phase separation, produces application
Value.
Claims (4)
1. a kind of high efficiency composition phase-change material, characterized in that the high efficiency composition phase-change material is by thermal medium, nucleating agent, thickening
Agent efficiently leads energy additive and fusing point conditioning agent by following mass percentage composition：
Thermal medium：96.5%-75%；Nucleating agent：0.5%-3%；Thickener：3%-7%；Efficiently leading can agent：1-15%；Fusing point
Conditioning agent：0.1-10%；
The thermal medium is by inorganic salts aqueous sodium persulfate solution, water-soluble without disodium hydrogen phosphate aqueous solution, aqueous sodium carbonate, calcium chloride
Liquid or lithium bromide water solution one or more aqueous solution are mixed in any proportion；
The nucleating agent is six water strontium chlorides, potassium chloride, sodium borate decahydrate, barium sulfate or calcirm-fluoride therein any one
Kind；
The thickener is that diatomite, attapulgite, polyacrylamide, Sodium Polyacrylate, carboxymethyl cellulose are one such
Or several arbitrary proportions are mixed；
The energy additive of efficiently leading is metal class filler or carbons filler or ceramic-like filler；
The fusing point conditioning agent is ammonium chloride, ammonium sulfate, ammonium nitrate any type therein.
2. a kind of high efficiency composition phase-change material according to claim 1, characterized in that the metal class filler is Ag powder
Or Cu powder or Al powder or Mg powder or N powder any type therein；The carbons filler be amorphous carbon, carbon fiber,
Graphite, diamond, carbon nanotube or graphene any type therein；The ceramic-like filler is boron nitride (BN), aluminium nitride
(AN), silicon nitride (SiN4), silicon carbide (SiC), magnesia (MgO), beryllium oxide (BeO), aluminium oxide (Al203), zinc oxide
(Zn0), silica (SiO2) any type therein.
3. the preparation method of high efficiency composition phase-change material as described in claim 1-2 is any, steps are as follows：
A, 40-60 grams of inorganic salt particle is added in 100 grams of water, is uniformly mixed, thermal medium, i.e. inorganic salt solution is made；
B, 0.5-3 grams of nucleating agent is added into inorganic salt solution made from step A, is uniformly mixed, obtained solution；
C, 3-7 grams of thickener is added into solution made from step B, efficiently leads 1-15 grams of agent of energy, 0-10 grams of fusing point conditioning agent, stirs
Mix uniformly mixed, obtained high efficiency composition phase-change material.
4. the preparation method of high efficiency composition phase-change material according to claim 3, it is characterized in that stirring temperature in the step A
Degree is 70 DEG C -80 DEG C, mixing speed 450rpm-1000rpm；
Whipping temp is 70 DEG C -80 DEG C in the step B, mixing speed 450rpm-1000rpm；
Whipping temp is 70 DEG C -80 DEG C in the step C, mixing speed 3000rpm-8000rpm.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109504352A (en) * | 2018-12-29 | 2019-03-22 | 北京华厚能源科技有限公司 | 8 ~ 10 DEG C of composite phase change energy-storing cool storage materials of one kind and preparation method thereof |
| CN110467413A (en) * | 2019-08-22 | 2019-11-19 | 北京城建九秋实混凝土有限公司 | A kind of crack resistance mass concrete and preparation method thereof |
| WO2021056870A1 (en) * | 2019-09-29 | 2021-04-01 | 长沙理工大学 | Composite phase change regulator and preparation method for and application of composite phase change heat storage material containing same |
| CN112940685A (en) * | 2019-12-10 | 2021-06-11 | 强野机械科技(上海)有限公司 | Phase-change energy storage material and preparation method thereof |
| CN113337917A (en) * | 2021-06-25 | 2021-09-03 | 上海儒熵新能源科技有限公司 | Inorganic saline water phase change composite fiber and preparation method thereof |
| CN113549428A (en) * | 2021-06-18 | 2021-10-26 | 张雨新 | Preparation method of modified DHPD and eutectic hydrated salt thereof |
| GB2600510A (en) * | 2020-10-29 | 2022-05-04 | Burton Geoff | Phase change material |
| CN114517078A (en) * | 2022-01-07 | 2022-05-20 | 西安理工大学 | Eutectic salt inorganic shape-stabilized phase change material suitable for building energy storage and preparation method thereof |
| CN115287045A (en) * | 2022-08-12 | 2022-11-04 | 广州中健云康网络科技有限公司 | Low-temperature phase change material with phase change temperature of-32 to-36 ℃ and preparation method thereof |
| US20220381026A1 (en) * | 2020-09-25 | 2022-12-01 | Qilu University Of Technology | Energy-storing temperature control material and preparation method and application thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109504352A (en) * | 2018-12-29 | 2019-03-22 | 北京华厚能源科技有限公司 | 8 ~ 10 DEG C of composite phase change energy-storing cool storage materials of one kind and preparation method thereof |
| CN110467413A (en) * | 2019-08-22 | 2019-11-19 | 北京城建九秋实混凝土有限公司 | A kind of crack resistance mass concrete and preparation method thereof |
| WO2021056870A1 (en) * | 2019-09-29 | 2021-04-01 | 长沙理工大学 | Composite phase change regulator and preparation method for and application of composite phase change heat storage material containing same |
| CN112940685A (en) * | 2019-12-10 | 2021-06-11 | 强野机械科技(上海)有限公司 | Phase-change energy storage material and preparation method thereof |
| US11946246B2 (en) * | 2020-09-25 | 2024-04-02 | Qilu University Of Technology | Energy-storing temperature control material and preparation method and application thereof |
| US20220381026A1 (en) * | 2020-09-25 | 2022-12-01 | Qilu University Of Technology | Energy-storing temperature control material and preparation method and application thereof |
| GB2600510A (en) * | 2020-10-29 | 2022-05-04 | Burton Geoff | Phase change material |
| GB2600445A (en) * | 2020-10-29 | 2022-05-04 | Burton Geoff | Phase change material |
| GB2600510B (en) * | 2020-10-29 | 2023-05-31 | Burton Geoff | Phase change material |
| CN113549428A (en) * | 2021-06-18 | 2021-10-26 | 张雨新 | Preparation method of modified DHPD and eutectic hydrated salt thereof |
| CN113337917A (en) * | 2021-06-25 | 2021-09-03 | 上海儒熵新能源科技有限公司 | Inorganic saline water phase change composite fiber and preparation method thereof |
| CN114517078A (en) * | 2022-01-07 | 2022-05-20 | 西安理工大学 | Eutectic salt inorganic shape-stabilized phase change material suitable for building energy storage and preparation method thereof |
| CN115287045A (en) * | 2022-08-12 | 2022-11-04 | 广州中健云康网络科技有限公司 | Low-temperature phase change material with phase change temperature of-32 to-36 ℃ and preparation method thereof |
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