CN105733517B - A kind of agricultural material for storing heat of phase change in low temperature and preparation method - Google Patents
A kind of agricultural material for storing heat of phase change in low temperature and preparation method Download PDFInfo
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- CN105733517B CN105733517B CN201610154881.1A CN201610154881A CN105733517B CN 105733517 B CN105733517 B CN 105733517B CN 201610154881 A CN201610154881 A CN 201610154881A CN 105733517 B CN105733517 B CN 105733517B
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- Prior art keywords
- phase change
- low temperature
- heat
- storing heat
- disodium hydrogen
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- 230000008859 change Effects 0.000 title claims abstract description 66
- 239000012773 agricultural material Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims abstract description 49
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000001103 potassium chloride Substances 0.000 claims abstract description 24
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 24
- 239000007864 aqueous solution Substances 0.000 claims abstract description 23
- 238000004090 dissolution Methods 0.000 claims abstract description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 18
- 239000001257 hydrogen Substances 0.000 claims abstract description 18
- 238000009825 accumulation Methods 0.000 claims abstract description 16
- 150000003863 ammonium salts Chemical class 0.000 claims abstract description 15
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 claims abstract description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000007873 sieving Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 25
- 238000005338 heat storage Methods 0.000 claims description 19
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 15
- 239000011232 storage material Substances 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 14
- 235000019270 ammonium chloride Nutrition 0.000 claims description 7
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 6
- 239000004254 Ammonium phosphate Substances 0.000 claims description 5
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims description 5
- 235000019289 ammonium phosphates Nutrition 0.000 claims description 5
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 4
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 4
- 235000011151 potassium sulphates Nutrition 0.000 claims description 4
- 229910000160 potassium phosphate Inorganic materials 0.000 claims description 3
- 235000011009 potassium phosphates Nutrition 0.000 claims description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 2
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 2
- 150000002431 hydrogen Chemical class 0.000 claims 2
- 238000007654 immersion Methods 0.000 claims 1
- 230000007704 transition Effects 0.000 abstract description 19
- 238000004781 supercooling Methods 0.000 abstract description 17
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000000178 monomer Substances 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 abstract description 2
- 229920003023 plastic Polymers 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 description 17
- 239000012782 phase change material Substances 0.000 description 13
- 238000001816 cooling Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000009466 transformation Effects 0.000 description 7
- 238000012216 screening Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- -1 disodium hydrogen Chemical class 0.000 description 4
- 230000012010 growth Effects 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 229920001223 polyethylene glycol Polymers 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000001361 adipic acid Substances 0.000 description 2
- 235000011037 adipic acid Nutrition 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000007500 overflow downdraw method Methods 0.000 description 2
- RECVMTHOQWMYFX-UHFFFAOYSA-N oxygen(1+) dihydride Chemical compound [OH2+] RECVMTHOQWMYFX-UHFFFAOYSA-N 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010413 gardening Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000013500 performance material Substances 0.000 description 1
- CKRORYDHXIRZCH-UHFFFAOYSA-N phosphoric acid;dihydrate Chemical class O.O.OP(O)(O)=O CKRORYDHXIRZCH-UHFFFAOYSA-N 0.000 description 1
- 235000014786 phosphorus Nutrition 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
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
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/246—Air-conditioning systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/14—Measures for saving energy, e.g. in green houses
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention discloses a kind of agricultural material for storing heat of phase change in low temperature and preparation method thereof, specially mix crystalline disodium hydrogen with water, and dissolution obtains disodium hydrogen phosphate aqueous solution at 50~80 DEG C；Then sylvite and ammonium salt is added, dissolution obtains mixed liquor at 30~80 DEG C；Then adjusting mixeding liquid temperature is 5~30 DEG C；Then sieving mixed liquor, extracting screen underflow are placed in convection oven, are dried in 20~45 DEG C to get agricultural material for storing heat of phase change in low temperature is arrived.Agricultural material for storing heat of phase change in low temperature phase transition temperature prepared by the present invention is 15.1~34 DEG C, and latent heat of phase change range is 160~200J/g, and degree of supercooling is 0.5~2 DEG C, and accumulation of heat, exothermal efficiency are high；And preparation method is simple, is applicable to the facility cultivations such as agricultural sunlight greenhouse, beam-connected greenhouse, plastic monomer greenhouse.
Description
Technical field
The present invention relates to a kind of agricultural phase change heat storage materials, and in particular to one kind is based on disodium hydrogen phosphate crystalline compounds
Want heat accumulating phase change material, the agricultural material for storing heat of phase change in low temperature and preparation method of addition sylvite, ammonium salt and water.
Background technique
Greenhouse is an important production method in modern installations agricultural.However, since winter climate is especially cold,
Existing greenhouse is difficult to maintain the growth of winter crops, and warm room temperature deficiency will lead to crop frozen injury, and produce are made in reduction
Amount and agricultural product quality, therefore, the greenhouse temperature increasing measure for seeking green economy have become the key of cold season hothouse production and ask
Topic.Solar energy is the following optimal energy, but since Changes in weather is influenced by season and round the clock, directly utilization is limited
System.Therefore, making full use of for solar energy depends on effective heat accumulation mode.
Heat-storing material, refer to it is a kind of can be under given conditions by the heat storage of certain forms, and can be in spy
The material for being discharged and being utilized under conditions of fixed.Heat-storing material must generally have good reversibility, energy storage density it is high, can
The features such as strong operability.Phase change heat storage material absorbed heat in phase transition process using substance heat release carry out storage release latent heat, by it
It is (low that high temperature (being higher than 450 DEG C), medium temperature (100~450 DEG C), low temperature (0~100 DEG C) and ultralow temperature are divided into using phase transition temperature
In 0 DEG C) etc. 4 classes, wherein low-temperature phase-change material be the effective heat accumulation of agricultural greenhouse greenhouse open new approach, temperature can be greatly improved
Room solar energy utilization ratio reduces greenhouse heat dissipation capacity, heat regulation function in enhanced room.Therefore phase-change material has very wide hair
Exhibition prospect.
Both at home and abroad to the research of agricultural greenhouse greenhouse phase-change material concentrate on inorganic hydrated salt, paraffin, fatty acid and it
Compound, successively to CaCl2·6H2O、Na2SO4·10H2O, paraffin and polyethylene glycol etc. are main phase change heat storage material
It is studied.Chinese patent application CN201210003218.3 discloses a kind of composite phase-change heat storage, by heat-storage agent,
Phase transition temperature regulator, crystallization nucleating agent, suspension thickener, five seed type raw material of solvent composition, the Na of preparation2SO4·10H2O
Composite phase change heat-accumulation material phase transition temperature be 24~32 DEG C, latent heat of phase change be less than 170J/g, 3~5 DEG C of degree of supercooling, phase transition temperature
Higher, accumulation of heat is less, and degree of supercooling is high；Chinese patent application CN200610032662.2 discloses a kind of polyethylene glycol/titanium dioxide
Silicon composite shape-setting phase-change material, 67 DEG C of phase transition temperature of polyethylene glycol phase composite phase-change material or so of preparation, latent heat of phase change is about
140J/g, phase transition temperature is high, and latent heat of phase change is lower；Chinese patent application CN201410803518.9 discloses a kind of medium temperature phase
Change heat storage material is made of adipic acid, rare earth oxide, graphene and binder, and the adipic acid heat-storing material accumulation of heat of preparation is put
Thermal cycle is no more than 500 times, and stability is poor.Therefore, it is necessary to develop a kind of storage of entirely appropriate greenhouse demand
Heat is high, degree of supercooling is low, stable cycle performance material for storing heat of phase change in low temperature and preparation method, the excellent greenhouse of split volatility
Heat storage phase-changing material has important practical value.
Summary of the invention
The purpose of the present invention is in view of the above drawbacks of the prior art, providing, a kind of amount of stored heat is high, degree of supercooling is low, performance is steady
Fixed material for storing heat of phase change in low temperature and preparation method, heat-storing material obtained can meet the growth need of agricultural greenhouse greenhouse crops
It wants.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of preparation method of agricultural material for storing heat of phase change in low temperature, comprising the following steps: by crystalline disodium hydrogen and water
Mixing, dissolution obtains disodium hydrogen phosphate aqueous solution at 50~80 DEG C；Then sylvite and ammonium salt is added, is dissolved at 30~80 DEG C
Obtain mixed liquor；Then adjusting mixeding liquid temperature is 5~30 DEG C；Then sieving mixed liquor, extracting screen underflow are placed in convection oven,
It is dried in 20~45 DEG C to get agricultural material for storing heat of phase change in low temperature is arrived.
For the present invention with disodium hydrogen phosphate crystalline compounds for main heat accumulating phase change material, sylvite, ammonium salt are fusing point controlling agent,
Water is enhanced thermal conduction material, agricultural material for storing heat of phase change in low temperature is prepared, wherein by weight percent, preparing agricultural low-temperature phase
The raw material of change heat storage material is respectively as follows:
Crystalline disodium hydrogen 62.9~83.5%
Sylvite 3.7~4.6%
Ammonium salt 3.7~4.6%
Water surplus.
In the present invention, the crystalline disodium hydrogen is the disodium hydrogen phosphate with the crystallization water, such as ten hydrogen phosphate dihydrates
One of disodium, ten water disodium hydrogen phosphates, six water disodium hydrogen phosphates are a variety of；The sylvite is potassium chloride, potassium sulfate, phosphorus
One of sour potassium is a variety of；The ammonium salt is one of ammonium sulfate, ammonium chloride, ammonium phosphate or a variety of.
Preferably, the reactor equipped with crystalline disodium hydrogen and water is put into 50~80 DEG C of constant temperature of water-bath by the present invention
Middle heating, concussion, until all dissolution obtains disodium hydrogen phosphate aqueous solution to crystalline disodium hydrogen；Sieving mixed liquor is with sieved
Mixed liquor is filtered, some granule foreigns in reaction solution are removed, the aperture generally sieved is 100 mesh.
Preferably, crystalline disodium hydrogen is mixed with water, dissolution obtains disodium hydrogen phosphate aqueous solution at 50~65 DEG C；
Then sylvite and ammonium salt is added, dissolution obtains mixed liquor at 30~50 DEG C；Then adjusting mixeding liquid temperature is 5~12 DEG C；It connects
Sieving mixed liquor, extracting screen underflow be placed in convection oven, in 20~28 DEG C drying to get arrive agricultural low temperature phase change accumulation of heat material
Material.In the present invention, when heating, each dissolution of raw material is uniform, and will not destroy intermolecular force；When cooling, mixture can
Form good solidifying body；After drying, phase-change material each component compatibility is good, is not in mutually to separate；Be conducive to properties of product
Stablize, phase-change material high comprehensive performance is particularly suitable for winter greenhouse gardening.
Preferably, by weight percent, the raw material for preparing agricultural material for storing heat of phase change in low temperature is respectively as follows:
Crystalline disodium hydrogen 72~81.7%
Sylvite 3.9~4.5%
Ammonium salt 3.9~4.5%
Water surplus.
It is further preferred that by weight percent, the raw material for preparing agricultural material for storing heat of phase change in low temperature is respectively as follows:
Crystalline disodium hydrogen 72.1~72.2%
Sylvite 4.3~4.35%
Ammonium salt 4.3~4.35%
Water surplus.
20.4 DEG C of the phase transition temperature of the phase change heat storage material of preparation is suitable for crop growth, and lower degree of supercooling is 0.5 DEG C,
The higher 178J/g of latent heat of phase change.
In the present invention, sylvite and ammonium salt are dissolved in disodium hydrogen phosphate aqueous solution, can reduce hydrone and disodium hydrogen phosphate it
Between active force, reduce the eutectic temperature of disodium hydrogen phosphate；In solution, K+And NH4 +It is combined with water ion, reduces phosphoric acid hydrogen two
The aquation of sodium, to reduce its fusing point.The prior art is mixed with the raw material of phase-change heat-storage material by way of melting,
This causes to mix unevenness between each raw material, reduces the quality stability of phase-change heat-storage material；And when fusion method mixing, in order to keep away
Exempt from raw material it is rotten and can only melt raw material at a lower temperature, this causes raw material to exist to melt insufficient, easily occur mutually separating,
Increase the ratio of defects of product；It can not filter out when fusion method prepares phase-change heat-storage material simultaneously due to uneven heating, overreaction etc.
The granule foreign of generation, this causes phase-change heat-storage material application performance unstable.The invention in phase-change heat-storage material
Water is added in preparation, can increase the heating conduction of solution, be conducive to dissolving and heat absorbing and crystallization exotherm, and the phase transformation for improving material is latent
Heat；Especially it can guarantee that the phase-change heat-storage material performance of preparation is uniform, stablizes to avoid the interference of reaction impurities.
The material for storing heat of phase change in low temperature phase transition temperature that the present invention prepares is 15.1~34 DEG C, and latent heat of phase change range is 160
~200J/g, degree of supercooling are 0.5~2 DEG C；It can be applied to the cultivations such as agricultural sunlight greenhouse, beam-connected greenhouse, plastic monomer greenhouse to set
Shi Zhong, therefore the application the invention also discloses above-mentioned agricultural material for storing heat of phase change in low temperature in greenhouse plantation.
Due to the application of above-mentioned technical proposal, the invention has the following advantages that
(1) present invention adds sylvite for the first time, ammonium salt is with disodium hydrogen phosphate crystalline compounds for main phase-transition heat-storage raw material
Fusing point controlling agent, and in presence of water, solution reaction prepares material for storing heat of phase change in low temperature, and phase transition temperature is 15.1~34
DEG C, latent heat of phase change range is 160~200J/g, and degree of supercooling is 0.5~2 DEG C, is suitble to chamber crop growth.
(2) present invention reduces the active force between hydrone and disodium hydrogen phosphate by sylvite, ammonium salt, reduces phosphoric acid hydrogen two
The eutectic temperature of sodium, in solution, K+And NH4 +It is combined with water ion, the aquation of disodium hydrogen phosphate is reduced, to drop significantly
Its low fusing point, degree of supercooling, the phase change heat storage material latent heat of phase change of preparation is high, heating conduction and thermal stability are good, degree of supercooling
It is 0.5~2 DEG C, achieves unexpected technical effect.
(3) present invention prepares the simple process of material for storing heat of phase change in low temperature, easy to operate, and raw materials used is conventional products,
Reaction condition is mild, is easy to industrial production and large-scale application.
Detailed description of the invention
Fig. 1 is the cooling curve figure of agricultural material for storing heat of phase change in low temperature prepared by embodiment two；
Fig. 2 is the cooling curve figure of agricultural material for storing heat of phase change in low temperature prepared by embodiment three；
Fig. 3 is the cooling curve figure of agricultural material for storing heat of phase change in low temperature prepared by embodiment six.
Specific embodiment
Below with reference to examples and drawings, the invention will be further described.
Embodiment one
Test tube equipped with 10g disodium hydrogen phosphate and 1g water is put into 80 DEG C of constant temperature of water-bath and is heated, is shaken,
Until all dissolution obtains disodium hydrogen phosphate aqueous solution to disodium hydrogen phosphate；It is sequentially added in disodium hydrogen phosphate aqueous solution
0.5g potassium chloride (KCl), 0.5g ammonium chloride (NH4Cl), it is heated to 70 DEG C to make it dissolve, is cooled to 30 DEG C to it, fills and be sieved through filter,
Screenings is dried in 45 DEG C of convection oven, obtains agricultural material for storing heat of phase change in low temperature.
After tested, the phase transition temperature of above-mentioned agricultural low-temperature heat accumulating phase-change material be 34 DEG C, 1.6 DEG C of degree of supercooling, latent heat of phase change
160J/g, recycles through 1000 accumulation of heat heat releases, and thermal stability is good.
Embodiment two
Test tube equipped with 25g disodium hydrogen phosphate, six water disodium hydrogen phosphate of 20g and 10g water is put into 60 DEG C of constant temperature
Water-bath in heat, shake, until disodium hydrogen phosphate crystalline compounds all dissolution obtain disodium hydrogen phosphate aqueous solution；In phosphorus
2.5g potassium chloride (KCl), 2.5g ammonium chloride (NH are sequentially added in sour disodium hydrogen aqueous solution4Cl), 50 DEG C are heated to make it dissolve,
25 DEG C are cooled to it, fills and is sieved through filter, screenings is dried in 35 DEG C of convection oven, obtains agricultural low temperature phase change accumulation of heat material
Material.
Fig. 1 is the cooling curve figure of above-mentioned agricultural material for storing heat of phase change in low temperature, after tested, above-mentioned agricultural low-temperature heat accumulating phase transformation
The phase transition temperature of material is 30.4 DEG C, 0.9 DEG C of degree of supercooling, latent heat of phase change 190J/g, is recycled through 1000 accumulation of heat heat releases, thermostabilization
Performance is good.
Embodiment three
Test tube equipped with 55g disodium hydrogen phosphate and 22g water is put into 50 DEG C of constant temperature of water-bath and is heated, is shaken
It swings, until all dissolution obtains disodium hydrogen phosphate aqueous solution to disodium hydrogen phosphate；In disodium hydrogen phosphate aqueous solution successively
3.9g potassium chloride (KCl), 3.9g ammonium chloride (NH is added4Cl), it is heated to 30 DEG C to make it dissolve, is cooled to 20 DEG C to it, dress sieve
Filtering, screenings are dried in 30 DEG C of convection oven, obtain agricultural material for storing heat of phase change in low temperature.
Fig. 2 is the cooling curve of above-mentioned agricultural material for storing heat of phase change in low temperature, after tested, above-mentioned agricultural low-temperature heat accumulating phase transformation material
The phase transition temperature of material be 28 DEG C, 2 DEG C of degree of supercooling, latent heat of phase change 200J/g.It is recycled through 1000 accumulation of heat heat releases, thermal stability
It is good.
Example IV
Test tube equipped with 40g disodium hydrogen phosphate, ten water disodium hydrogen phosphate of 35g and 20g water is put into 70 DEG C of constant temperature
Water-bath in heat, shake, until disodium hydrogen phosphate crystalline compounds all dissolution obtain disodium hydrogen phosphate crystalline compounds
Aqueous solution；2.5 potassium chloride, 2g potassium phosphate and 4.5g chlorination are sequentially added in the aqueous solution of disodium hydrogen phosphate crystalline compounds
Ammonium is heated to 55 DEG C and makes it dissolve, and is cooled to 15 DEG C to it, fills and be sieved through filter, screenings is dried in 28 DEG C of convection oven, obtained
To agricultural material for storing heat of phase change in low temperature.
After tested, the phase transition temperature of above-mentioned agricultural low-temperature heat accumulating phase-change material is 20.4 DEG C, and 0.5 DEG C of degree of supercooling, phase transformation is latent
Hot 178J/g.It is recycled through 1000 accumulation of heat heat releases, thermal stability is good.
Embodiment five
Test tube equipped with 60g disodium hydrogen phosphate and 18g water is put into 60 DEG C of constant temperature of water-bath and is heated, is shaken
It swings, until all dissolution obtains the aqueous solution of disodium hydrogen phosphate crystalline compounds to disodium hydrogen phosphate crystalline compounds；In phosphoric acid hydrogen
2.0g potassium chloride, 1.8g potassium sulfate, 2.5g ammonium chloride, 1.3g ammonium phosphate are sequentially added in the aqueous solution of disodium crystalline compounds,
It is heated to 45 DEG C to make it dissolve, is cooled to 10 DEG C to it, fills and be sieved through filter, screenings is dried in 25 DEG C of convection oven, obtained
Agricultural material for storing heat of phase change in low temperature.
After tested, the phase transition temperature of above-mentioned agricultural low-temperature heat accumulating phase-change material is 18.6 DEG C, and 1.1 DEG C of degree of supercooling, phase transformation is latent
Hot 182J/g.It is recycled through 1000 accumulation of heat heat releases, thermal stability is good.
Embodiment six
Test tube equipped with 55g disodium hydrogen phosphate, ten water disodium hydrogen phosphate of 30g and 40g water is put into 60 DEG C of constant temperature
Water-bath in heat, shake, until disodium hydrogen phosphate crystalline compounds all dissolution obtain disodium hydrogen phosphate crystalline compounds
Aqueous solution；2.5g potassium chloride, 2.5g potassium sulfate, 2.9g chlorine are sequentially added in the aqueous solution of disodium hydrogen phosphate crystalline compounds
Change ammonium, 2.1g ammonium phosphate, be heated to 40 DEG C and make it dissolve, is cooled to 5 DEG C to it, fills and be sieved through filter, air blast of the screenings at 20 DEG C
It is dried in baking oven, obtains agricultural material for storing heat of phase change in low temperature.
Fig. 3 is the cooling curve of above-mentioned agricultural material for storing heat of phase change in low temperature, after tested, above-mentioned agricultural low-temperature heat accumulating phase transformation material
The phase transition temperature of material be 15.1 DEG C, 1.7 DEG C of degree of supercooling, latent heat of phase change 166J/g.It is recycled through 1000 accumulation of heat heat releases, thermal stability
It can be good.
Embodiment seven
35g disodium hydrogen phosphate, ten water disodium hydrogen phosphate of 28g, six water disodium hydrogen phosphate of 12g and 20g water will be housed
Test tube be put into 60 DEG C of constant temperature of water-bath and heat, shake, until all dissolution obtains phosphorus to disodium hydrogen phosphate crystalline compounds
The aqueous solution of sour disodium hydrogen crystalline compounds；Sequentially added in the aqueous solution of disodium hydrogen phosphate crystalline compounds 2.5 potassium chloride,
2g potassium phosphate and 3.5g ammonium chloride, 1g ammonium phosphate, are heated to 40 DEG C and make it dissolve, and are cooled to 12 DEG C to it, fill and are sieved through filter, under sieve
Object is dried in 25 DEG C of convection oven, obtains agricultural material for storing heat of phase change in low temperature.
After tested, the phase transition temperature of above-mentioned agricultural low-temperature heat accumulating phase-change material is 19.1 DEG C, and 0.5 DEG C of degree of supercooling, phase transformation is latent
Hot 188J/g.It is recycled through 1000 accumulation of heat heat releases, thermal stability is good.
It is prepared by the present invention, agricultural material for storing heat of phase change in low temperature is obtained, by different material ratio, changes phase transition temperature,
To adapt to different greenhouses and plant growth needs, meet actual needs.
Claims (8)
1. a kind of preparation method of agricultural material for storing heat of phase change in low temperature, which comprises the following steps: by crystalline hydrogen
Disodium is mixed with water, and dissolution obtains disodium hydrogen phosphate aqueous solution at 50~80 DEG C；Then sylvite and ammonium salt is added, in 30~80
Dissolution obtains mixed liquor at DEG C；Then adjusting mixeding liquid temperature is 5~30 DEG C；Then sieving mixed liquor, extracting screen underflow are placed in drum
In wind baking oven, dried in 20~45 DEG C to get agricultural material for storing heat of phase change in low temperature is arrived；By weight percent, agricultural low temperature is prepared
The raw material of phase change heat storage material is respectively as follows:
One of disodium hydrogen phosphate is a variety of；The sylvite is one of potassium chloride, potassium sulfate, potassium phosphate or a variety of；Institute
Stating ammonium salt is one of ammonium sulfate, ammonium chloride, ammonium phosphate or a variety of.
2. the preparation method of agricultural material for storing heat of phase change in low temperature according to claim 1, it is characterised in that: press quality percentage
Number, the raw material for preparing agricultural material for storing heat of phase change in low temperature are respectively as follows:
3. the preparation method of agricultural material for storing heat of phase change in low temperature according to claim 1, which is characterized in that prepare crystalline
When disodium hydrogen aqueous solution, under the conditions of earthquake, until all dissolution obtains disodium hydrogen phosphate aqueous solution to crystalline disodium hydrogen.
4. the preparation method of agricultural material for storing heat of phase change in low temperature according to claim 1, it is characterised in that: when sieving mixed liquor
The aperture of sieve is 100 mesh.
5. the preparation method of agricultural material for storing heat of phase change in low temperature according to claim 1, it is characterised in that: by crystalline hydrogen
Disodium is mixed with water, and dissolution obtains disodium hydrogen phosphate aqueous solution at 50~65 DEG C；Then sylvite and ammonium salt is added, in 30~50
Dissolution obtains mixed liquor at DEG C；Then adjusting mixeding liquid temperature is 5~12 DEG C；Then sieving mixed liquor, extracting screen underflow are placed in drum
In wind baking oven, dried in 20~28 DEG C to get agricultural material for storing heat of phase change in low temperature is arrived.
6. the preparation method of agricultural material for storing heat of phase change in low temperature according to claim 1, it is characterised in that: use immersion method tune
Save mixeding liquid temperature.
7. the agricultural low temperature phase change accumulation of heat material of the preparation method preparation of agricultural material for storing heat of phase change in low temperature according to claim 1
Material.
8. application of the agricultural material for storing heat of phase change in low temperature described in claim 7 in greenhouse plantation.
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| CN102405270A (en) * | 2009-02-11 | 2012-04-04 | 阿蒂卡科技有限公司 | Phase change material composition |
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