CN115073981A - Preparation method of water-based nano heat-insulating coating - Google Patents
Preparation method of water-based nano heat-insulating coating Download PDFInfo
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- CN115073981A CN115073981A CN202210607606.6A CN202210607606A CN115073981A CN 115073981 A CN115073981 A CN 115073981A CN 202210607606 A CN202210607606 A CN 202210607606A CN 115073981 A CN115073981 A CN 115073981A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000000576 coating method Methods 0.000 title claims abstract description 51
- 239000011248 coating agent Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 136
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 68
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000011591 potassium Substances 0.000 claims abstract description 47
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 47
- 238000003756 stirring Methods 0.000 claims abstract description 36
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 34
- 239000002033 PVDF binder Substances 0.000 claims abstract description 32
- 239000002135 nanosheet Substances 0.000 claims abstract description 32
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 32
- 239000002121 nanofiber Substances 0.000 claims abstract description 31
- 239000006185 dispersion Substances 0.000 claims abstract description 28
- 239000000839 emulsion Substances 0.000 claims abstract description 28
- 239000004964 aerogel Substances 0.000 claims abstract description 27
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 229910000027 potassium carbonate Inorganic materials 0.000 claims abstract description 17
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 239000003063 flame retardant Substances 0.000 claims abstract description 13
- 239000012046 mixed solvent Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims abstract description 12
- 239000010445 mica Substances 0.000 claims abstract description 12
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 12
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000007853 buffer solution Substances 0.000 claims abstract description 11
- 229960001149 dopamine hydrochloride Drugs 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000001354 calcination Methods 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 6
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 150000003608 titanium Chemical class 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 45
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 30
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 30
- 239000004005 microsphere Substances 0.000 claims description 26
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 20
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 20
- 239000002904 solvent Substances 0.000 claims description 20
- 238000009413 insulation Methods 0.000 claims description 17
- 239000002131 composite material Substances 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 12
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 230000001804 emulsifying effect Effects 0.000 claims description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 6
- 239000002518 antifoaming agent Substances 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 6
- 239000000347 magnesium hydroxide Substances 0.000 claims description 6
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 6
- 239000003960 organic solvent Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000010041 electrostatic spinning Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 238000009987 spinning Methods 0.000 claims description 5
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- DKUYEPUUXLQPPX-UHFFFAOYSA-N dibismuth;molybdenum;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Mo].[Mo].[Bi+3].[Bi+3] DKUYEPUUXLQPPX-UHFFFAOYSA-N 0.000 claims description 4
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims description 4
- RTOOMIOWOJBNTK-UHFFFAOYSA-K sodium;zinc;phosphate Chemical compound [Na+].[Zn+2].[O-]P([O-])([O-])=O RTOOMIOWOJBNTK-UHFFFAOYSA-K 0.000 claims description 4
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 21
- 230000000694 effects Effects 0.000 description 8
- 239000011810 insulating material Substances 0.000 description 5
- 239000011324 bead Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 239000002159 nanocrystal Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000002207 thermal evaporation Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000000845 anti-microbial effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011381 foam concrete Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C—CHEMISTRY; METALLURGY
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
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Abstract
The invention relates to a preparation method of a water-based nano heat-insulating coating, which comprises the following specific steps: 1) dissolving titanium salt in the mixed solvent and uniformly stirring; reacting, cooling, washing and drying to obtain dispersed titanium dioxide nanoclusters; dispersing the titanium dioxide nano-sheet in a buffer solution, adding dopamine hydrochloride, stirring, filtering and calcining to obtain the controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nano-sheet. 2) Preparing a PVDF/(potassium carbonate and titanium dioxide) nanofiber felt; treating the mixture at low temperature to obtain a potassium hexatitanate crystal/PVDF nanofiber felt; pure O 2 And (3) making an atmosphere, heating, sealing, keeping for 20-30 min, cooling, and collecting a whisker sample. 3) Weighing raw materials, preparing water nano SiO 2 An aerogel suspension emulsion; dispersing mica powder, adding near infrared reflecting material and fire retardant, and stirring; preparing synthetic slurry; the aerogel suspending emulsion is synthesizedAdding the slurry, the film-forming assistant and other assistants into a mixed product of mica powder and other materials, stirring uniformly at a low speed to obtain the water-based nano heat-insulating coating, and coating and drying to obtain the coating.
Description
Technical Field
The invention relates to the technical field of preparation of heat-insulating coatings, in particular to a novel water-based nano heat-insulating coating and a preparation method thereof.
Background
The coating is a continuous film which is coated on the surface of an object to be protected or decorated and can form firm adhesion with the object to be coated, and is a viscous liquid which is prepared by taking resin, oil or emulsion as a main material, adding or not adding pigments and fillers, adding corresponding auxiliaries and using an organic solvent or water.
At present, along with the requirement of building energy saving constantly improves, people also constantly improve to the comfort level requirement in places such as oneself living, work, study, amusement, guarantee above the place warm in winter and cool in summer's prerequisite under, the expenditure that still will be continuous to reduce the energy use simultaneously, often need use the heat preservation coating to reform transform the heat preservation region that needs thermal-insulated such as current building outer wall or roof for the outer wall has functions such as heat preservation, thermal-insulated. However, most of the traditional building heat insulation materials are organic heat insulation materials, and the fireproof performance is poor. The outer wall heat-insulating material of civil buildings in China must adopt buildings with the combustion performance of A level or B1 level and the height of less than 24 m, the combustion performance of the heat-insulating material should not be lower than B2 level, and meanwhile, a fireproof isolation strip is arranged, so that the application range of the traditional heat-insulating material for buildings in the building engineering is greatly limited. Although inorganic heat-insulating materials such as rock wool, mineral wool, glass wool, foam concrete, vitrified micro bubbles and the like have combustion performance reaching A level, the inorganic heat-insulating materials have poor heat conductivity and poor heat-insulating performance, even lose effectiveness when meeting water, and can hardly achieve ideal heat-insulating, heat-insulating and energy-saving effects when being used alone.
The environment-friendly water-based nano heat insulation material technology with excellent heat insulation and heat preservation, fire prevention safety and environmental protection is developed, the inorganic nano material and the inorganic heat insulation material are compounded, and the film forming and functional auxiliary agents are matched to prepare the slurry-shaped heat insulation and heat preservation material with adjustable thermal performance. The heat-insulating and energy-saving technology and material can greatly improve the heat-insulating and heat-preserving effect of inorganic materials and have excellent environmental protection and fireproof performance.
Therefore, the controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheets are added into the novel water-based nano heat-insulating coating, and have larger specific surface area and more reaction sites, so that the ageing resistance, heat-insulating property and heat-insulating property of the coating can be better improved; in addition, the yield of the potassium hexatitanate whisker prepared by the nanofiber template-induced low-temperature heat treatment combined with the flowing oxygen-assisted thermal evaporation method is high, and the potassium hexatitanate whisker has excellent high-temperature resistance compared with the potassium hexatitanate whisker synthesized by the traditional method. Therefore, the water-based nano heat-insulating coating prepared based on the two improved materials has the advantages of excellent heat insulation, fire prevention, safety and environmental protection, and the service life of the coating is prolonged.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a novel water-based nano heat-insulating coating and a preparation method thereof comprise the following steps,
the invention relates to a preparation method of a water-based nano heat-insulating coating. The method is characterized by comprising the following specific steps:
1) preparation of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet
(1) Dissolving titanium salt in a mixed solvent of ethylene glycol and deionized water, magnetically stirring for 10-20 min until the solution is uniformly mixed, then transferring the solution to a reaction kettle, reacting for 20-24 h at 200-240 ℃, cooling to room temperature, washing for 3-5 times with deionized water and an organic solvent, and then placing the solution in a vacuum drying oven for overnight drying at 100-120 ℃ to obtain dispersed titanium dioxide nano clusters;
(2) dispersing the titanium dioxide nanoclusters obtained in the step (1) in 100-150 mL of buffer solution, and then adding dopamine hydrochloride into the buffer solution, wherein the mass ratio of the titanium dioxide nanoclusters to the dopamine hydrochloride is (2-5): and 1, magnetically stirring the suspension for 24-30 hours at room temperature, filtering, and calcining in a muffle furnace at the speed of 1-2 ℃/min at the temperature of 400-500 ℃ for 3-5 hours to finally obtain the controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet.
2) Method for preparing potassium hexatitanate whisker by combining nanofiber template-induced low-temperature heat treatment with flowing oxygen-assisted heat evaporation method
(1) Dissolving polyvinylidene fluoride in a mixed solvent of N, N-dimethylformamide and acetone, wherein the volume ratio of the N, N-dimethylformamide to the acetone is 1-3: 1; heating the solution to 50-55 ℃ until the polyvinylidene fluoride is completely dissolved;
(2) adding potassium carbonate and titanium dioxide into the solution, continuously stirring the solution until a uniform solution is formed, and preparing a PVDF/(potassium carbonate and titanium dioxide) nano fiber felt by adopting an electrostatic spinning method under the voltage of 10-15 KV; and the distance between the receiving plate and the spinning end is 10-15 cm;
(3) performing low-temperature treatment on the PVDF/(potassium carbonate and titanium dioxide) nano fiber felt at 140-180 ℃ for 12-24 h to obtain potassium hexatitanate crystal powder/PVDF nano fiber felt;
(4) in order to improve the formation of potassium hexatitanate whiskers, pure O is adopted 2 Taking the mixture as a flowing atmosphere, heating the aluminum oxide pipe to 600-750 ℃ in a muffle furnace at the flow rate of 6-8L/min, then placing the potassium hexatitanate crystal powder/PVDF nano-fiber felt in the aluminum oxide pipe, sealing the pipe to ensure that the oxygen partial pressure is 50-60 KPa, cooling the pipe to room temperature after keeping the oxygen partial pressure for 20-30 min, and collecting a potassium hexatitanate whisker sample through a membrane filter placed between a vacuum pipe and a vacuum pump.
3) Preparation of water-based nano heat-insulating coating
(1) Weighing the following raw materials in parts by weight: 20 parts of solvent, 22 parts of acrylic acid weather-resistant emulsion, 10 parts of near-infrared reflecting material, 10 parts of nano hollow glass microspheres, 10 parts of composite nano ceramic microspheres and SiO 2 3.5 parts of aerogel, 3 parts of mica powder, 6 parts of potassium hexatitanate whisker, 10 parts of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, 1 part of film-forming assistant, 0.5 part of ultraviolet absorber, 2 parts of flame retardant and 2 parts of other assistant;
(2) mixing acrylic emulsion and SiO 2 Adding aerogel into sealed homogenizing emulsifying machine, stirring and mixing to obtain SiO 2 The aerogel is fully dispersed, mixed and dissolved in the emulsion and uniformly compounded to obtain the water-based nano SiO 2 An aerogel suspension emulsion;
(3) dispersing mica powder in a high-speed stirrer, and then putting the near-infrared reflecting material and the flame retardant into the high-speed disperser to continue stirring until the materials are uniformly mixed;
(4) filling a controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, a potassium hexatitanate whisker and a solvent into a sealed homogenizing emulsifying machine, carrying out high-speed shearing and grinding to obtain premixed slurry, then adding nano hollow glass microspheres and composite nano ceramic microspheres into the prepared premixed slurry, continuously stirring and mixing to fully disperse, dissolve and compound the controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, the nano hollow glass microspheres and the composite nano ceramic microspheres in the solvent uniformly, and obtaining synthetic slurry;
(5) mixing water-based nano SiO 2 And (3) adding the aerogel suspension emulsion, the synthetic slurry, the film forming aid and other aids into the product obtained in the step (3), stirring at a low speed to disperse uniformly to obtain the water-based nano heat-insulating coating, and coating and drying to obtain the nano heat-insulating coating.
Preferably, in the step 1), the titanium salt is one or a combination of tetrabutyl titanate, isopropyl titanate or tetraisopropyl titanate.
Preferably, in the step 1), the volume ratio of the mixed solvent ethylene glycol to the deionized water is 2-3: 1.
preferably, in the step 3), the solvent is a combination of deionized water, ethanol or n-butanol, wherein the weight ratio is as follows: 10: 5-8: 2 to 5.
Preferably, in the step 3), the acrylic acid is one of methacrylic acid and methyl methacrylate or a combination thereof.
Preferably, in the step 3), the flame retardant is one or a combination of low-density magnesium hydroxide or aluminum hydroxide flame retardant.
Preferably, in the step 3), the assistant is one or a combination of an antifoaming agent, a leveling agent and a stabilizer.
Preferably, in the step 3), the near-infrared reflective material is one or a combination of indium tin oxide, sodium zinc phosphate or bismuth molybdate.
Compared with the prior art, the preparation method of the anti-dazzle nano antimicrobial composite functional material and the coating prepared by the method has the following beneficial effects:
(1) titanium dioxide nanoclusters are prepared by a hydrothermal method, and then the controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheets are self-assembled by the aid of the gradual intercalation and rapid induced growth technology of double organic molecules with different particle sizes. The high dispersity enables the titanium dioxide nanosheets to have high dispersity, and the heat preservation and insulation effect of the titanium dioxide can be improved; the two-dimensional double-layer ultrathin titanium dioxide nanosheet has a large specific surface area and many reaction sites.
(2) Titanium atoms in the two-dimensional double-layer ultrathin titanium dioxide nanosheets are easy to form certain complexes with water molecules in the air due to electronic arrangement, and hydrogen atoms in ligand water molecules are easy to attract oxygen, nitrogen and the like in the air through Van der Waals force, so that the material has more air or inert gas in a closed space and has good slow conductivity to heat, the material changes slowly along with the change of external temperature, and the heat preservation effect is finally achieved; meanwhile, the heat-insulation plate plays a role in reflecting various rays generating heat and the like, and achieves the effect that the temperature of an action surface does not rise quickly along with the radiation of a heat source, thereby achieving the heat insulation effect.
(3) The potassium hexatitanate crystal whisker is prepared by combining nanofiber template-induced low-temperature heat treatment with a flowing oxygen-assisted heat evaporation method, and the potassium hexatitanate nanocrystal is prepared by nanofiber template-induced low-temperature heat treatment, wherein potassium carbonate and titanium dioxide have high reaction activity mainly under the induction of the nanofiber template, so that the treatment temperature is reduced; and then the potassium hexatitanate whisker is prepared by a flowing oxygen assisted thermal evaporation method, the potassium hexatitanate nanocrystal is converted into the potassium hexatitanate whisker, the yield of the hexatitanate whisker prepared under severe conditions is high, and compared with the potassium hexatitanate whisker synthesized by the traditional method, the potassium hexatitanate whisker has excellent high-temperature resistance, so that the service life is prolonged.
Drawings
FIG. 1 is an SEM image of a titanium dioxide nanocluster according to an embodiment of the present invention
FIG. 2 is an SEM image of potassium hexatitanate whiskers of an example of the invention
FIG. 3 is a flow chart of a process of the water-based nano thermal insulation coating according to the first, second and third embodiments of the present invention
FIG. 4 is a graph showing the effect of the thickness of the first, second and third middle coatings on the thermal insulation performance of the material according to the embodiment of the present invention
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
1) Preparation of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet
(1) Dissolving tetrabutyl titanate in a mixed solvent of ethylene glycol and deionized water, wherein the volume ratio of the ethylene glycol to the deionized water is 3: 1, magnetically stirring for 15 min until the solution is uniformly mixed, then transferring the solution to a reaction kettle to react for 20 h at 220 ℃, then cooling the solution to room temperature, washing the solution for 3 times by using deionized water and an organic solvent, and then placing the solution in a vacuum drying oven to dry the solution overnight at 120 ℃ to obtain dispersed titanium dioxide nano clusters;
(2) dispersing the titanium dioxide nanoclusters obtained in the step (1) in 100 mL of buffer solution, and then adding dopamine hydrochloride into the buffer solution, wherein the mass ratio of the titanium dioxide nanoclusters to the dopamine hydrochloride is 4: and 1, magnetically stirring the suspension for 24 hours at room temperature, filtering, and calcining for 4 hours at 450 ℃ in a muffle furnace at the speed of 2 ℃/min to finally obtain the controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet.
2) Method for preparing potassium hexatitanate whisker by combining nanofiber template-induced low-temperature heat treatment with flowing oxygen-assisted heat evaporation method
(1) Dissolving polyvinylidene fluoride in a mixed solvent of N, N-dimethylformamide and acetone, wherein the volume ratio of the N, N-dimethylformamide to the acetone is 1: 1; heating the solution to 50 ℃ until the polyvinylidene fluoride is completely dissolved;
(2) adding potassium carbonate and titanium dioxide into the solution, continuously stirring the solution until a uniform solution is formed, and preparing a PVDF/(potassium carbonate and titanium dioxide) nano fiber felt by adopting an electrostatic spinning method under the voltage of 10 KV; and the distance between the receiving plate and the spinning end is 10 cm;
(3) performing low-temperature treatment on the PVDF/(potassium carbonate and titanium dioxide) nano fiber felt at 140 ℃ for 20 h to obtain potassium hexatitanate crystal powder/PVDF nano fiber felt;
(4) in order to improve the formation of potassium hexatitanate whiskers, pure O is adopted 2 Taking the mixture as a flowing atmosphere, heating an aluminum oxide pipe to 600 ℃ in a muffle furnace at the flow rate of 6L/min, then placing the potassium hexatitanate crystal powder/PVDF nano-fiber felt in the aluminum oxide pipe for sealing to ensure that the oxygen partial pressure is 50 KPa, cooling the pipe to room temperature after keeping for 20 min, and collecting a potassium hexatitanate whisker sample through a membrane filter placed between a vacuum pipe and a vacuum pump.
3) Preparation of water-based nano heat-insulating coating
(1) Weighing the following raw materials in parts by weight: 20 parts of solvent (the solvent is the combination of deionized water, ethanol or n-butyl alcohol, the weight ratio is 10: 8: 5), 22 parts of methacrylic acid weather-resistant emulsion, 10 parts of near infrared reflection material indium tin oxide, 10 parts of nano hollow glass beads, 10 parts of composite nano ceramic beads and SiO 2 3.5 parts of aerogel, 3 parts of mica powder, 6 parts of potassium hexatitanate whisker, 10 parts of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, 1 part of film-forming assistant, 0.5 part of ultraviolet absorber, 2 parts of flame retardant low-density magnesium hydroxide and 2 parts of defoaming agent;
(2) mixing methacrylic acid emulsion and SiO 2 Adding aerogel into sealed homogenizing emulsifying machine, stirring and mixing to obtain SiO 2 The aerogel is fully dispersed, mixed and dissolved in the emulsion and uniformly compounded to obtain the water-based nano SiO 2 An aerogel suspension emulsion;
(3) dispersing mica powder in a high-speed stirrer, and then putting near-infrared reflecting materials of indium tin oxide and low-density magnesium hydroxide into the high-speed disperser to be continuously stirred until the materials are uniformly mixed;
(4) filling a controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, a potassium hexatitanate whisker and a solvent into a sealed homogenizing emulsifying machine, carrying out high-speed shearing and grinding to obtain premixed slurry, then adding nano hollow glass microspheres and composite nano ceramic microspheres into the prepared premixed slurry, continuously stirring and mixing to fully disperse, dissolve and compound the controllable high-dispersion two-dimensional ultrathin titanium dioxide nanosheet, the nano hollow glass microspheres and the composite nano ceramic microspheres in the solvent uniformly, and obtaining synthetic slurry;
(5) mixing water-based nano SiO 2 And (3) adding the aerogel suspension emulsion, the synthetic slurry, the film forming assistant and the defoaming agent into the product obtained in the step (3), stirring at a low speed to disperse uniformly to obtain the water-based nano heat-insulating coating, and coating and drying to obtain the nano heat-insulating coating, wherein the thickness of the coating is 1 mm.
Example two
1) Preparation of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet
(1) Dissolving isopropyl titanate in a mixed solvent of ethylene glycol and deionized water, wherein the volume ratio of the ethylene glycol to the deionized water is 2: 1, magnetically stirring for 10 min until the solution is uniformly mixed, then transferring the solution to a reaction kettle to react for 24 h at 200 ℃, then cooling the solution to room temperature, washing the solution for 3 times by using deionized water and an organic solvent, and then placing the solution in a vacuum drying oven to dry the solution overnight at 100 ℃ to obtain dispersed titanium dioxide nano clusters;
(2) dispersing the titanium dioxide nanoclusters obtained in the step (1) in 100 mL of buffer solution, and then adding dopamine hydrochloride into the buffer solution, wherein the mass ratio of the titanium dioxide nanoclusters to the dopamine hydrochloride is 2: and 1, magnetically stirring the suspension for 24 hours at room temperature, filtering, and calcining for 5 hours at 400 ℃ in a muffle furnace at the speed of 1 ℃/min to finally obtain the controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet.
2) Method for preparing potassium hexatitanate whisker by combining nanofiber template-induced low-temperature heat treatment with flowing oxygen-assisted heat evaporation method
(1) Dissolving polyvinylidene fluoride in a mixed solvent of N, N-dimethylformamide and acetone, wherein the volume ratio of the N, N-dimethylformamide to the acetone is 2: 1; heating the solution to 55 ℃ until the polyvinylidene fluoride is completely dissolved;
(2) adding potassium carbonate and titanium dioxide into the solution, continuously stirring the solution until a uniform solution is formed, and preparing a PVDF/(potassium carbonate and titanium dioxide) nano fiber felt by adopting an electrostatic spinning method under the voltage of 15 KV; and the distance between the receiving plate and the spinning end is 15 cm;
(3) performing low-temperature treatment on the PVDF/(potassium carbonate and titanium dioxide) nano fiber felt at 160 ℃ for 18 h to obtain potassium hexatitanate crystal powder/PVDF nano fiber felt;
(4) in order to improve the formation of potassium hexatitanate whiskers, pure O is adopted 2 Taking the mixture as a flowing atmosphere, heating an aluminum oxide pipe to 650 ℃ in a muffle furnace at the flow rate of 8L/min, then placing the potassium hexatitanate crystal powder/PVDF nano-fiber felt in the aluminum oxide pipe for sealing to enable the oxygen partial pressure to be 55 KPa, cooling the pipe to room temperature after keeping for 20 min, and collecting a potassium hexatitanate whisker sample through a membrane filter placed between a vacuum pipe and a vacuum pump.
3) Preparation of water-based nano heat-insulating coating
(1) Weighing the following raw materials in parts by weight: 20 parts of solvent (the solvent is the combination of deionized water, ethanol or n-butanol, the weight ratio is 10: 8: 3), 22 parts of methyl methacrylate weather-resistant emulsion, 10 parts of near-infrared reflection material sodium zinc phosphate, 10 parts of nano-scale hollow glass beads, 10 parts of composite nano ceramic beads and SiO 2 3.5 parts of aerogel, 3 parts of mica powder, 6 parts of potassium hexatitanate whisker, 10 parts of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, 1 part of film-forming assistant, 0.5 part of ultraviolet absorber, 2 parts of flame retardant low-density aluminum hydroxide and 2 parts of advection agent;
(2) mixing methyl methacrylate emulsion and SiO 2 Adding aerogel into sealed homogenizing emulsifying machine, stirring and mixing to obtain SiO 2 The aerogel is fully dispersed, mixed and dissolved in the emulsion and uniformly compounded to obtain the water-based nano SiO 2 An aerogel suspension emulsion;
(3) dispersing mica powder in a high-speed stirrer, and then putting near-infrared reflection material sodium zinc phosphate and flame retardant low-density aluminum hydroxide into a high-speed disperser to be continuously stirred until the materials are uniformly mixed;
(4) filling a controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, a potassium hexatitanate whisker and a solvent into a sealed homogenizing emulsifying machine, carrying out high-speed shearing and grinding to obtain premixed slurry, then adding nano hollow glass microspheres and composite nano ceramic microspheres into the prepared premixed slurry, continuously stirring and mixing to fully disperse, dissolve and compound the controllable high-dispersion two-dimensional ultrathin titanium dioxide nanosheet, the nano hollow glass microspheres and the composite nano ceramic microspheres in the solvent uniformly, and obtaining synthetic slurry;
(5) mixing water-based nano SiO 2 And (3) adding the aerogel suspension emulsion, the synthetic slurry, the film forming assistant and the defoaming agent into the product obtained in the step (3), stirring at a low speed to disperse uniformly to obtain the water-based nano heat-insulating coating, and coating and drying to obtain the nano heat-insulating coating, wherein the thickness of the coating is 2 mm.
EXAMPLE III
1) Preparation of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet
(1) Dissolving isopropyl titanate in a mixed solvent of ethylene glycol and deionized water, wherein the volume ratio of the ethylene glycol to the deionized water is 2: 1, magnetically stirring for 10 min until the solution is uniformly mixed, then transferring the solution to a reaction kettle to react for 20 h at 240 ℃, then cooling the solution to room temperature, washing the solution for 5 times by using deionized water and an organic solvent, and then placing the solution in a vacuum drying oven to dry the solution overnight at 120 ℃ to obtain dispersed titanium dioxide nano clusters;
(2) dispersing the titanium dioxide nanoclusters obtained in the step (1) in 150 mL of buffer solution, and then adding dopamine hydrochloride into the buffer solution, wherein the mass ratio of the titanium dioxide nanoclusters to the dopamine hydrochloride is 5: and 1, magnetically stirring the suspension for 30 hours at room temperature, filtering, and calcining for 3 hours at 500 ℃ in a muffle furnace at the speed of 2 ℃/min to finally obtain the controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet.
2) Method for preparing potassium hexatitanate whisker by combining nanofiber template-induced low-temperature heat treatment with flowing oxygen-assisted heat evaporation method
(1) Dissolving polyvinylidene fluoride in a mixed solvent of N, N-dimethylformamide and acetone, wherein the volume ratio of the N, N-dimethylformamide to the acetone is 3: 1, heating the solution to 55 ℃ until polyvinylidene fluoride is completely dissolved;
(2) adding potassium carbonate and titanium dioxide into the solution, continuously stirring the solution until a uniform solution is formed, and preparing a PVDF/(potassium carbonate and titanium dioxide) nano fiber felt by adopting an electrostatic spinning method under the voltage of 10 KV; and the distance between the receiving plate and the spinning end is 15 cm;
(3) performing low-temperature treatment on the PVDF/(potassium carbonate and titanium dioxide) nano fiber felt at 180 ℃ for 12 h to obtain potassium hexatitanate crystal powder/PVDF nano fiber felt;
(4) in order to improve the formation of potassium hexatitanate whiskers, pure O is adopted 2 Taking the mixture as a flowing atmosphere, heating an aluminum oxide pipe to 750 ℃ in a muffle furnace at the flow rate of 8L/min, then placing the potassium hexatitanate crystal powder/PVDF nano-fiber felt in the aluminum oxide pipe for sealing to ensure that the oxygen partial pressure is 60 KPa, cooling the pipe to room temperature after keeping for 30 min, and collecting a potassium hexatitanate whisker sample through a membrane filter placed between a vacuum pipe and a vacuum pump.
3) Preparation of water-based nano heat-insulating coating
(1) Weighing the following raw materials in parts by weight: 20 parts of solvent (the solvent is the combination of deionized water, ethanol or n-butanol, the weight ratio is 10: 5: 5), 22 parts of methyl methacrylate weather-resistant emulsion, 10 parts of near-infrared reflecting material bismuth molybdate, 10 parts of nano-scale hollow glass microspheres, 10 parts of composite nano-ceramic microspheres and SiO 2 3.5 parts of aerogel, 3 parts of mica powder, 6 parts of potassium hexatitanate whisker, 10 parts of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, 1 part of film-forming assistant, 0.5 part of ultraviolet absorber, 2 parts of flame retardant low-density magnesium hydroxide and 2 parts of stabilizer;
(2) mixing methyl methacrylate emulsion and SiO 2 Adding aerogel into sealed homogenizing emulsifying machine, stirring and mixing to obtain SiO 2 The aerogel is fully dispersed, mixed and dissolved in the emulsion and uniformly compounded to obtain the water-based nano SiO 2 An aerogel suspension emulsion;
(3) dispersing mica powder in a high-speed stirrer, and then putting a near-infrared reflection material bismuth molybdate and flame retardant low-density magnesium hydroxide into the high-speed disperser to be continuously stirred until the materials are uniformly mixed;
(4) filling a controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, a potassium hexatitanate whisker and a solvent into a sealed homogenizing emulsifying machine, carrying out high-speed shearing and grinding to obtain premixed slurry, then adding nano hollow glass microspheres and composite nano ceramic microspheres into the prepared premixed slurry, continuously stirring and mixing to fully disperse, dissolve and compound the controllable high-dispersion two-dimensional ultrathin titanium dioxide nanosheet, the nano hollow glass microspheres and the composite nano ceramic microspheres in the solvent uniformly, and obtaining synthetic slurry;
(5) mixing water-based nano SiO 2 And (3) adding the aerogel suspension emulsion, the synthetic slurry, the film forming assistant and the defoaming agent into the product obtained in the step (3), stirring at a low speed to disperse uniformly to obtain the water-based nano heat-insulating coating, and coating and drying to obtain the nano heat-insulating coating, wherein the thickness of the coating is 3 mm.
As can be seen from fig. 4, the thickness of the coating layer is increased to increase the heat insulation performance, but the heat insulation performance is not increased or slightly decreased when the thickness is increased after a certain thickness is reached, and the increase of the thickness to increase the heat insulation performance is probably because the thickness is increased to transmit less electromagnetic waves, thereby increasing the heat insulation performance. When the thickness reaches a certain value, the light wave is difficult to penetrate, and the heat insulation performance can not be increased any more when the thickness is increased.
TABLE 1 Performance index of the aqueous nano thermal insulation coating in examples one, two and three
| Serial number | Coefficient of thermal conductivity (W/m.K) | Coefficient of heat transfer (W/m.K) | Heat preservation energy saving rate (%) | Safety against fire | Weather resistance stability |
| Example one | 0.032 | Front side: 0.47; and (3) reverse side: 0.45 of; | 90 | non-combustible at 1400 DEG C | The leather does not swell and fall off at the high temperature of 1000 DEG C |
| Example two | 0.038 | Front side: 0.45 of; and (3) reverse side: 0.43; | 89 | no combustion at 1380 ℃ | No peeling at high temperature of 985 DEG C |
| EXAMPLE III | 0.042 | Front side: 0.44; and (3) reverse side: 0.43; | 88.2 | non-combustible at 1375 DEG C | High temperature of 980 ℃ without leather bulging and falling |
Claims (8)
1. The invention relates to a preparation method of a water-based nano heat-preservation and heat-insulation coating, which is characterized by comprising the following specific steps:
1) preparation of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet
(1) Dissolving titanium salt in a mixed solvent of ethylene glycol and deionized water, magnetically stirring for 10-20 min until the solution is uniformly mixed, transferring the solution to a reaction kettle, reacting for 20-24 h at 200-240 ℃, cooling to room temperature, washing for 3-5 times with deionized water and an organic solvent, and then placing the solution in a vacuum drying oven for overnight drying at 100-120 ℃ to obtain dispersed titanium dioxide nano clusters;
(2) dispersing the titanium dioxide nanoclusters obtained in the step (1) in 100-150 mL of buffer solution, and then adding dopamine hydrochloride into the buffer solution, wherein the mass ratio of the titanium dioxide nanoclusters to the dopamine hydrochloride is (2-5): 1, magnetically stirring the suspension for 24-30 hours at room temperature, filtering, and calcining in a muffle furnace at 400-500 ℃ for 3-5 hours at the speed of 1-2 ℃/min to finally obtain a controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet;
2) method for preparing potassium hexatitanate whisker by combining nanofiber template-induced low-temperature heat treatment with flowing oxygen-assisted heat evaporation method
(1) Dissolving polyvinylidene fluoride in a mixed solvent of N, N-dimethylformamide and acetone, wherein the volume ratio of the N, N-dimethylformamide to the acetone is 1-3: 1; heating the solution to 50-55 ℃ until the polyvinylidene fluoride is completely dissolved;
(2) adding potassium carbonate and titanium dioxide into the solution, continuously stirring the solution until a uniform solution is formed, and preparing a PVDF/(potassium carbonate and titanium dioxide) nano fiber felt by adopting an electrostatic spinning method under the voltage of 10-15 KV; and the distance between the receiving plate and the spinning end is 10-15 cm;
(3) performing low-temperature treatment on the PVDF/(potassium carbonate and titanium dioxide) nano fiber felt at 140-180 ℃ for 12-24 h to obtain potassium hexatitanate crystal powder/PVDF nano fiber felt;
(4) in order to improve the formation of potassium hexatitanate whiskers, pure O is adopted 2 Taking the mixture as a flowing atmosphere, heating an aluminum oxide pipe to 600-750 ℃ in a muffle furnace at the flow rate of 6-8L/min, then placing the potassium hexatitanate crystal powder/PVDF nano-fiber felt in the aluminum oxide pipe for sealing, keeping the oxygen partial pressure at 50-60 KPa, cooling the pipe to room temperature after keeping for 20-30 min, and collecting a potassium hexatitanate whisker sample through a membrane filter placed between a vacuum pipe and a vacuum pump;
3) preparation of water-based nano heat-insulating coating
(1) Weighing the following raw materials in parts by weight: 20 parts of solvent, 22 parts of acrylic acid weather-resistant emulsion, 10 parts of near-infrared reflecting material, 10 parts of nano hollow glass microspheres, 10 parts of composite nano ceramic microspheres and SiO 2 3.5 parts of aerogel, 3 parts of mica powder, 6 parts of potassium hexatitanate whisker, 10 parts of controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, 1 part of film-forming assistant, 0.5 part of ultraviolet absorber, 2 parts of flame retardant and 2 parts of other assistant;
(2) mixing acrylic emulsion and SiO 2 Loading aerogel into sealed homogenizing emulsifying machine, stirring, and mixing to obtain SiO 2 The aerogel is fully dispersed, mixed and dissolved in the emulsion and uniformly compounded to obtain the water-based nano SiO 2 An aerogel suspension emulsion;
(3) dispersing mica powder in a high-speed stirrer, and then putting the near-infrared reflecting material into a high-speed disperser to continue stirring until the mixture is uniformly mixed;
(4) filling a controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, a potassium hexatitanate whisker and a solvent into a sealed homogenizing emulsifying machine, carrying out high-speed shearing and grinding to obtain premixed slurry, then adding nano hollow glass microspheres and composite nano ceramic microspheres into the prepared premixed slurry, continuously stirring and mixing to fully disperse, dissolve and compound the controllable high-dispersion two-dimensional double-layer ultrathin titanium dioxide nanosheet, the nano hollow glass microspheres and the composite nano ceramic microspheres in the solvent uniformly, and obtaining synthetic slurry;
(5) mixing water-based nano SiO 2 And (3) adding the aerogel suspension emulsion, the synthetic slurry, the film forming aid and other aids into the product obtained in the step (3), stirring at a low speed to disperse uniformly to obtain the water-based nano heat-insulating coating, and coating and drying to obtain the nano heat-insulating coating.
2. The method for preparing the water-based nano thermal insulation coating according to claim 1, wherein the titanium salt is one or a combination of tetrabutyl titanate, isopropyl titanate or tetraisopropyl titanate.
3. The preparation method of the water-based nano heat-insulating coating according to claim 1, wherein the volume ratio of the mixed solvent ethylene glycol to the deionized water is 2-3: 1.
4. the preparation method of the water-based nano heat-insulating coating as claimed in claim 1, wherein the solvent is a combination of deionized water, ethanol or n-butanol, wherein the weight ratio of: 10: 5-8: 2 to 5.
5. The method for preparing the water-based nano heat-insulating thermal-insulating coating according to claim 1, wherein the acrylic acid is one or a combination of methacrylic acid and methyl methacrylate.
6. The method for preparing the water-based nano thermal insulation coating according to claim 1, wherein the flame retardant is one or a combination of low-density magnesium hydroxide or aluminum hydroxide flame retardant.
7. The preparation method of the water-based nano heat-insulating and heat-insulating coating according to claim 1, wherein the film-forming assistant is one or a combination of a defoaming agent, a leveling agent and a stabilizer.
8. The preparation method of the water-based nano heat-insulating and heat-insulating coating as claimed in claim 1, wherein the near infrared reflecting material is one or a combination of indium tin oxide, sodium zinc phosphate or bismuth molybdate.
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