CN116854496A - Preparation method of fly ash porous heat-insulating material - Google Patents
Preparation method of fly ash porous heat-insulating material Download PDFInfo
- Publication number
- CN116854496A CN116854496A CN202310825519.2A CN202310825519A CN116854496A CN 116854496 A CN116854496 A CN 116854496A CN 202310825519 A CN202310825519 A CN 202310825519A CN 116854496 A CN116854496 A CN 116854496A
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- Prior art keywords
- fly ash
- drying
- conditions
- substrate
- stirring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000010881 fly ash Substances 0.000 title claims abstract description 126
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000011810 insulating material Substances 0.000 title claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 50
- 239000012774 insulation material Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 30
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000000498 ball milling Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 239000002131 composite material Substances 0.000 claims abstract description 24
- 229910021542 Vanadium(IV) oxide Inorganic materials 0.000 claims abstract description 22
- 239000008367 deionised water Substances 0.000 claims abstract description 22
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 22
- 239000000839 emulsion Substances 0.000 claims abstract description 22
- GRUMUEUJTSXQOI-UHFFFAOYSA-N vanadium dioxide Chemical compound O=[V]=O GRUMUEUJTSXQOI-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 21
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 21
- 239000010937 tungsten Substances 0.000 claims abstract description 21
- 229920001690 polydopamine Polymers 0.000 claims abstract description 19
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims abstract description 18
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 13
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 238000004321 preservation Methods 0.000 claims abstract description 11
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000007864 aqueous solution Substances 0.000 claims abstract description 10
- 239000012975 dibutyltin dilaurate Substances 0.000 claims abstract description 10
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 9
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 claims abstract description 9
- 239000005058 Isophorone diisocyanate Substances 0.000 claims abstract description 8
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 16
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 15
- QKNYBSVHEMOAJP-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydron;chloride Chemical compound Cl.OCC(N)(CO)CO QKNYBSVHEMOAJP-UHFFFAOYSA-N 0.000 claims description 12
- 239000004375 Dextrin Substances 0.000 claims description 11
- 229920001353 Dextrin Polymers 0.000 claims description 11
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000292 calcium oxide Substances 0.000 claims description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 11
- 235000019425 dextrin Nutrition 0.000 claims description 11
- 239000000395 magnesium oxide Substances 0.000 claims description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 11
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims description 10
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 10
- 229960001149 dopamine hydrochloride Drugs 0.000 claims description 10
- 229920000909 polytetrahydrofuran Polymers 0.000 claims description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 9
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 239000007853 buffer solution Substances 0.000 claims description 8
- 238000009210 therapy by ultrasound Methods 0.000 claims description 7
- 239000000872 buffer Substances 0.000 claims description 4
- 125000005442 diisocyanate group Chemical group 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 12
- 239000002994 raw material Substances 0.000 abstract description 2
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- 230000000052 comparative effect Effects 0.000 description 40
- 238000002386 leaching Methods 0.000 description 12
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- 238000009413 insulation Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 229920002635 polyurethane Polymers 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000012782 phase change material Substances 0.000 description 3
- 229940113116 polyethylene glycol 1000 Drugs 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
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- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 150000003681 vanadium Chemical class 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000001479 atomic absorption spectroscopy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229960003638 dopamine Drugs 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000009996 mechanical pre-treatment Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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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
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
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- C04B33/00—Clay-wares
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- C04B33/13—Compounding ingredients
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- C04B33/00—Clay-wares
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- C04B33/135—Combustion residues, e.g. fly ash, incineration waste
- C04B33/1352—Fuel ashes, e.g. fly ash
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- 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
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/38—Non-oxide ceramic constituents or additives
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- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
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- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Dispersion Chemistry (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to the technical field of heat preservation materials, and discloses a preparation method of a fly ash porous heat preservation material. The preparation method of the fly ash porous heat-insulating material comprises the following steps: mixing fly ash, red mud and sodium hydroxide aqueous solution, and ball milling to obtain pretreated fly ash; mixing the pretreated fly ash and various auxiliary agents, and heating to obtain a fly ash substrate; modifying the fly ash substrate with polydopamine to obtain polydopamine modified fly ash substrate; preparing tungsten doped vanadium dioxide by taking vanadium pentoxide, oxalic acid and tungstic acid as raw materials; reacting polyethylene glycol, isophorone diisocyanate and dibutyltin dilaurate, and adding tungsten doped vanadium dioxide, 2-dimethylolpropionic acid, 1, 4-butanediol and deionized water to obtain a composite emulsion; spraying the composite emulsion on the polydopamine modified fly ash substrate to obtain the fly ash porous heat insulation material. The preparation method is economical, safe and environment-friendly, and the obtained fly ash porous heat-insulating material has excellent heat-insulating performance.
Description
Technical Field
The invention relates to the technical field of heat insulation materials, in particular to a preparation method of a fly ash porous heat insulation material.
Background
Insulation materials are also known as insulation materials, and are generally porous materials with a low coefficient of thermal conductivity. The thermal insulation material is generally a material or composite material with high thermal resistance and capability of reducing heat exchange, such as glass fiber, mineral wool, foam and the like. The thermal insulation materials can be divided into organic and inorganic two kinds, and at present, organic thermal insulation materials are commonly used in the market, but have the risks of inflammability and easy fire hazard. In recent years, inorganic heat-insulating materials have been widely studied due to their safety and reliability in use. In China, a large amount of accumulated fly ash occupies a large amount of land, causes various negative effects on the aspects of atmosphere, water system, agriculture and the like, and has great harm to the environment and society. The fly ash is processed into the heat-insulating material for resource utilization, but the fly ash often contains a large amount of heavy metals, and the heavy metals are possibly leached out in the use process to cause harm to human bodies.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method of a fly ash porous heat-insulating material, which comprises the following steps:
step (1) mixing fly ash, red mud and sodium hydroxide aqueous solution, ball milling, centrifuging and drying to obtain pretreated fly ash;
in the process, the red mud is used as an additive to mechanically treat the fly ash, and leaching of heavy metals in the fly ash can be reduced through precipitation and sealing of fine particles, capturing of new phases and dissolution and elution of soluble salts; meanwhile, the porosity of the fly ash after mechanical pretreatment is increased, and the pore diameter is more uniform.
Step (2) mixing the pretreated fly ash, silicon carbide, dextrin, calcium oxide, magnesium oxide, steel slag and sodium oleate, heating and preserving heat to obtain a fly ash substrate;
in the above process, silicon carbide is used as a main foaming agent; dextrin as an auxiliary foaming agent and binder; the calcium oxide and the magnesium oxide are used as composite fluxing agents, and partial silicon is replaced by calcium ions and magnesium ions through breaking silicon oxygen bonds in the fly ash, so that the melting point of the system is reduced, the liquid phase quantity is increased, the formation of bubbles is facilitated, and meanwhile, the magnesium ions can also increase the surface tension of the liquid phase, so that the growth of the bubbles is inhibited, and the formation of uniform bubbles is facilitated; the steel slag is rich in ferric oxide, can be decomposed at high temperature to generate oxygen, provides sufficient oxygen environment in foaming, improves foaming efficiency, improves the uniformity of bubbles, and can effectively control the volume instability caused by a low-temperature liquid phase by matching the steel slag and the red mud, promote the development of crystals and facilitate the improvement of the mechanical properties of fly ash base materials; the addition of sodium oleate can prolong the bubble stabilizing time, increase the bubble stability, prevent the bubble collapse and improve the porosity and compressive strength of the fly ash substrate.
Immersing the fly ash substrate in Tris-HCl buffer solution, performing ultrasonic treatment, then adding dopamine hydrochloride, heating in a water bath, stirring, taking out the treated fly ash substrate after the reaction is finished, washing, and drying to obtain the polydopamine modified fly ash substrate;
in the process, polydopamine is coated on the fly ash substrate after the polymerization of the dopamine, so that the polydopamine modified fly ash substrate is obtained.
Adding vanadium pentoxide, oxalic acid and tungstic acid into deionized water, stirring, reacting, naturally cooling to room temperature, centrifuging, drying and annealing to obtain tungsten doped vanadium dioxide;
in the process, vanadium pentoxide is used as a vanadium source, pentavalent vanadium is reduced into tetravalent vanadium salt by oxalic acid in the presence of a doping agent tungstic acid, the tetravalent vanadium salt is decomposed at high temperature to obtain metastable tungsten doped vanadium dioxide, and finally, the metastable tungsten doped vanadium dioxide is converted into tungsten doped vanadium dioxide with phase change characteristics in an annealing process, so that the phase change temperature of the vanadium dioxide can be reduced by the doping of tungsten.
Step (5) mixing polyethylene glycol with polytetrahydrofuran, dropwise adding isophorone diisocyanate and dibutyltin dilaurate, heating, reacting, adding tungsten doped vanadium dioxide, 2-dimethylolpropionic acid and 1, 4-butanediol after the reaction is finished, cooling, adding deionized water, and homogenizing to obtain a composite emulsion;
in the process, polyethylene glycol polyurethane is generated through a prepolymerization reaction, and then the polyethylene glycol polyurethane is mixed with tungsten doped vanadium dioxide and deionized water to obtain the composite emulsion.
And (6) spraying the composite emulsion on the polydopamine modified fly ash substrate, solidifying and drying, and standing at room temperature to obtain the fly ash porous heat insulation material.
Preferably, in the step (1), the concentration of the sodium hydroxide aqueous solution is 0.5-1mol/L; the dosage ratio of the fly ash, the red mud and the sodium hydroxide aqueous solution is (10-20) kg (2-3) kg (100-300) L; ball milling conditions: ball milling is carried out for 18-28h at the rotating speed of 100-500r/min, zirconia balls with the diameter of 10mm and 6mm are adopted in the number ratio of 49:75, and the ball milling direction is changed every 30min in the ball milling process; drying temperature: 70-90 ℃.
Preferably, in the step (2), the mass ratio of the pretreated fly ash, silicon carbide, dextrin, calcium oxide, magnesium oxide, steel slag and sodium oleate is 100 (0.6-1.0), 8-10, 4-8, 6-12, 4-6 and 0.25-0.55; heating conditions: raising the temperature to 1160-1220 ℃ at the speed of 6-8 ℃/min; the heat preservation time is as follows: 5-15min.
Preferably, in the step (3), the pH of the Tris-HCl buffer is 8.5; ultrasonic treatment conditions: ultrasonic processing at 20-40KHz frequency at room temperature for 20-40min; water bath heating temperature: 35-45 ℃; stirring conditions: stirring at stirring speed of 150-300r/min for 12-16 hr.
Preferably, in the step (3), the washing liquid used for washing comprises deionized water; drying conditions: drying at 50-70deg.C for 20-30 hr; the dosage ratio of dopamine hydrochloride to Tris-HCl buffer is (2.6-5.2) g (120-180) mL.
Preferably, in the step (4), the mass ratio of the vanadium pentoxide to the oxalic acid to the tungstic acid to the deionized water is (2-4): 3-6): 0.03-0.3): 500-800; stirring conditions: stirring at 200-400r/min for 20-40min; reaction conditions: heating to 230-250 ℃ for reaction for 20-30h.
Preferably, in the step (4), the drying condition is: drying at 40-60deg.C for 10-14 hr; annealing conditions: annealing at 580-620 deg.c for 2.5-3.5 hr.
Preferably, in the step (5), the mass ratio of polyethylene glycol, polytetrahydrofuran, isophorone diisocyanate, dibutyl tin dilaurate, tungsten doped vanadium dioxide, 2-dimethylolpropionic acid, 1, 4-butanediol and deionized water is (1.5-3): (8-20): (4.1-8.2): (0.04-0.1): (0.1-0.2): (0.68-1.32): (0.08-0.2): (37-80).
Preferably, in the step (5), the condition of mixing polyethylene glycol with polytetrahydrofuran: mixing at 40-50deg.C; isofluorone diisocyanate, dibutyl tin dilaurate dropwise addition time: 15-25min; temperature rise: 80-90 ℃; reaction conditions: reacting for 2-3h at a stirring speed of 200-400 r/min; and (3) cooling conditions: cooling to 60-70deg.C, stirring for 1.5-2.5 hr, cooling to 40-50deg.C, adding triethylamine to adjust pH to 7, and naturally cooling to 25-30deg.C.
Preferably, in the step (6), the curing and drying conditions are that the curing and drying are carried out for 30-40min at 50-60 ℃; the placement time is as follows: 20-30h; the spraying thickness of the composite emulsion is controlled to be 150-200 mu m.
Compared with the prior art, the invention has the beneficial effects that:
1. the fly ash porous heat-insulating material is prepared by taking the waste fly ash, the red mud and the steel slag as raw material components, so that the reutilization of the waste is realized, and meanwhile, the leaching rate of heavy metals is greatly reduced by combining the auxiliary ball milling mechanical treatment of the red mud with the high-temperature treatment, so that the method is more economical, safer and environment-friendly.
2. According to the invention, fly ash is interacted with silicon carbide, dextrin, calcium oxide, magnesium oxide, steel slag and sodium oleate to obtain the fly ash base material with high porosity, uniform pore size and good mechanical property through high-temperature treatment.
3. In order to prevent polyethylene glycol leakage in the phase change process, polyethylene glycol is used as a soft segment to obtain polyethylene glycol-based polyurethane through polymerization, and then the polyethylene glycol-based polyurethane is compounded with a tungsten-doped vanadium dioxide phase change material to obtain a composite emulsion, and the composite emulsion is sprayed on a fly ash substrate, so that the heat preservation performance of the fly ash porous heat preservation material is further improved through the cooperation of an organic phase change material and an inorganic phase change material; furthermore, the invention improves the compatibility of the fly ash substrate and the composite emulsion by carrying out polydopamine modification treatment on the fly ash substrate, thereby further improving the heat preservation performance of the fly ash porous heat preservation material.
Drawings
FIG. 1 is a flow chart of the preparation process of the fly ash porous thermal insulation material of the invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
Example 1
The embodiment discloses a preparation method of a fly ash porous thermal insulation material, which comprises the following steps:
mixing 10kg of fly ash, 2kg of red mud and 100L of 0.5mol/L sodium hydroxide aqueous solution, ball milling for 18h at a rotating speed of 100r/min, wherein the ball milling adopts zirconia balls with the diameter of 10mm and 6mm in a number ratio of 49:75, the ball milling direction is changed every 30min in the ball milling process, centrifuging after the ball milling is finished, and drying the centrifugal product to constant weight at 70 ℃ to obtain the pretreated fly ash.
And (2) mixing the pretreated fly ash, silicon carbide, dextrin, calcium oxide, magnesium oxide, steel slag and sodium oleate uniformly in a mass ratio of 100:0.6:8:4:6:4:0.25, heating to 1160 ℃ at a speed of 6 ℃/min, and preserving heat for 5min to obtain the fly ash substrate.
Immersing the fly ash substrate in Tris-HCl buffer solution with pH of 8.5, carrying out ultrasonic treatment at room temperature and frequency of 20KHz for 20min, then adding dopamine hydrochloride, heating to 35 ℃ in a water bath, stirring for 12h at a stirring speed of 150r/min to fully expose the solution to oxygen, taking out the treated fly ash substrate after the reaction is finished, washing the fly ash substrate with deionized water for 3 times, and drying at 50 ℃ for 20h to obtain the polydopamine modified fly ash substrate; wherein the dosage ratio of the dopamine hydrochloride to the Tris-HCl buffer solution is 2.6 g/120 mL.
And (4) adding 2kg of vanadium pentoxide, 3kg of oxalic acid and 0.03kg of tungstic acid into 500L of deionized water, stirring for 20min at a rotating speed of 200r/min, heating to 230 ℃ for reaction for 20h, naturally cooling to room temperature, centrifuging, drying the centrifuged product at 40 ℃ for 10h, and annealing at 580 ℃ for 2.5h to obtain tungsten doped vanadium dioxide.
Step (5) mixing 1.5kg of polyethylene glycol 1000 and 8kg of polytetrahydrofuran at 40 ℃ to obtain a mixture, then dropwise adding 4.1kg of isophorone diisocyanate and 0.04kg of dibutyltin dilaurate into the mixture within 15min, heating to 80 ℃, reacting for 2h at a stirring speed of 200r/min, adding 0.1kg of tungsten doped vanadium dioxide, 0.68kg of 2, 2-dimethylolpropionic acid and 0.08kg of 1, 4-butanediol after the reaction is finished, cooling to 60 ℃ and continuing stirring for 1.5h, continuing cooling to 40 ℃, adding triethylamine to adjust the pH to 7, naturally cooling to 25 ℃, adding 37kg of deionized water, and homogenizing to obtain the composite emulsion.
And (6) spraying the composite emulsion on the polydopamine modified fly ash substrate, controlling the spraying thickness to be 150 mu m, curing and drying for 30min at 50 ℃, and then standing for 20h at room temperature to obtain the fly ash porous heat insulation material.
Example 2
The embodiment discloses a preparation method of a fly ash porous thermal insulation material, which comprises the following steps:
mixing 20kg of fly ash, 3kg of red mud and 300L of 1mol/L sodium hydroxide aqueous solution, ball milling for 28h at a rotating speed of 500r/min, wherein the ball milling adopts zirconia balls with the diameter of 10mm and 6mm in a number ratio of 49:75, the ball milling direction is changed every 30min in the ball milling process, centrifuging after the ball milling is finished, and drying the centrifugal product to constant weight at 90 ℃ to obtain the pretreated fly ash.
And (2) mixing the pretreated fly ash, silicon carbide, dextrin, calcium oxide, magnesium oxide, steel slag and sodium oleate in a mass ratio of 100:1.0:10:8:12:6:0.55 until the mixture is uniform, heating the mixture to 1220 ℃ at a speed of 8 ℃/min, and preserving heat for 15min to obtain the fly ash substrate.
Immersing the fly ash substrate in Tris-HCl buffer solution with pH of 8.5, carrying out ultrasonic treatment at room temperature and frequency of 40KHz for 40min, then adding dopamine hydrochloride, heating to 45 ℃ in a water bath, stirring for 16h at a stirring speed of 300r/min to fully expose the solution to oxygen, taking out the treated fly ash substrate after the reaction is finished, washing the fly ash substrate with deionized water for 5 times, and drying at 70 ℃ for 30h to obtain the polydopamine modified fly ash substrate; wherein the dosage ratio of the dopamine hydrochloride to the Tris-HCl buffer solution is 5.2 g/180 mL.
And (4) adding 4kg of vanadium pentoxide, 6kg of oxalic acid and 0.3kg of tungstic acid into 800L of deionized water, stirring for 40min at the rotation speed of 400r/min, heating to 250 ℃ for reaction for 30h, naturally cooling to room temperature, centrifuging, drying the centrifuged product at 60 ℃ for 14h, and annealing at 620 ℃ for 3.5h to obtain the tungsten doped vanadium dioxide.
Step (5) mixing 3kg of polyethylene glycol 1000 and 20kg of polytetrahydrofuran at 50 ℃ to obtain a mixture, then dropwise adding 8.2kg of isophorone diisocyanate and 0.1kg of dibutyltin dilaurate into the mixture within 25min, heating to 90 ℃, reacting for 3 hours at a stirring speed of 400r/min, adding 0.2kg of tungsten doped vanadium dioxide, 1.32kg of 2, 2-dimethylolpropionic acid and 0.2kg of 1, 4-butanediol after the reaction is finished, cooling to 70 ℃, continuously stirring for 2.5 hours, continuously cooling to 50 ℃, adding triethylamine to adjust the pH to 7, naturally cooling to 30 ℃, adding 80kg of deionized water, and homogenizing to obtain the composite emulsion.
And (6) spraying the composite emulsion on the polydopamine modified fly ash substrate, controlling the spraying thickness to be 200 mu m, curing and drying at 60 ℃ for 40min, and then standing at room temperature for 30h to obtain the fly ash porous heat insulation material.
Example 3
The embodiment discloses a preparation method of a fly ash porous thermal insulation material, which comprises the following steps:
step (1) mixing 15kg of fly ash, 2.5kg of red mud and 200L of 0.8mol/L sodium hydroxide aqueous solution, ball milling for 23h at a rotating speed of 300r/min, wherein the ball milling adopts zirconia balls with the diameter of 10mm and 6mm in a number ratio of 49:75, the ball milling direction is changed every 30min in the ball milling process, centrifuging after the ball milling is finished, and drying the centrifugal product to constant weight at 80 ℃ to obtain the pretreated fly ash.
And (2) mixing the pretreated fly ash, silicon carbide, dextrin, calcium oxide, magnesium oxide, steel slag and sodium oleate uniformly in a mass ratio of 100:0.8:9:6:9:5:0.45, heating to 1200 ℃ at a speed of 7 ℃/min, and preserving heat for 10min to obtain the fly ash substrate.
Immersing the fly ash substrate in Tris-HCl buffer solution with pH of 8.5, carrying out ultrasonic treatment at room temperature and frequency of 30KHz for 30min, then adding dopamine hydrochloride, heating to 40 ℃ in a water bath, stirring for 14h at a stirring speed of 250r/min to fully expose the solution to oxygen, taking out the treated fly ash substrate after the reaction is finished, washing the fly ash substrate with deionized water for 4 times, and drying at 60 ℃ for 25h to obtain the polydopamine modified fly ash substrate; wherein the dosage ratio of the dopamine hydrochloride to the Tris-HCl buffer solution is 3.9g:150mL.
And (4) adding 3kg of vanadium pentoxide, 4.5kg of oxalic acid and 0.2kg of tungstic acid into 700L of deionized water, stirring for 30min at the rotating speed of 300r/min, heating to 240 ℃ for reaction for 25h, naturally cooling to room temperature, centrifuging, drying the centrifuged product at 50 ℃ for 12h, and annealing at 600 ℃ for 3h to obtain the tungsten doped vanadium dioxide.
Step (5) mixing 2.5kg of polyethylene glycol 1000 and 14kg of polytetrahydrofuran at 45 ℃ to obtain a mixture, then dropwise adding 6.2kg of isophorone diisocyanate and 0.07kg of dibutyltin dilaurate into the mixture within 20min, heating to 85 ℃, reacting for 2.5h at a stirring speed of 300r/min, adding 0.15kg of tungsten doped vanadium dioxide, 1.0kg of 2, 2-dimethylolpropionic acid and 0.14kg of 1, 4-butanediol after the reaction is finished, cooling to 65 ℃ and continuously stirring for 2h, continuously cooling to 45 ℃, adding triethylamine to adjust the pH to 7, naturally cooling to 28 ℃, adding 60kg of deionized water, and homogenizing to obtain the composite emulsion.
And (6) spraying the composite emulsion on the polydopamine modified fly ash substrate, controlling the spraying thickness to be 180 mu m, curing and drying for 35min at 55 ℃, and then standing for 25h at room temperature to obtain the fly ash porous heat insulation material.
Comparative example 1
Comparative example 1 the fly ash of comparative example 1 was pretreated without red mud, and the other conditions were unchanged as compared with example 3.
Comparative example 2
Comparative example 2 in comparison with example 3, no dextrin was added during the preparation of the fly ash substrate in comparative example 2, and the other conditions were unchanged.
Comparative example 3
Comparative example 3 in comparison with example 3, no calcium oxide was added during the preparation of the fly ash substrate in comparative example 3, and the other conditions were unchanged.
Comparative example 4
Comparative example 4 in comparison with example 3, no magnesium oxide was added during the preparation of the fly ash substrate in comparative example 4, and the other conditions were unchanged.
Comparative example 5
Comparative example 5 in comparison with example 3, sodium oleate was not added during the preparation of the fly ash substrate in comparative example 5, and the other conditions were unchanged.
Comparative example 6
Comparative example 6 in comparison with example 3, no tungsten doped vanadium dioxide was added during the preparation of the composite emulsion in comparative example 6, and the other conditions were unchanged.
Comparative example 7
Comparative example 7 in comparison with example 3, in comparative example 7, the fly ash substrate was not subjected to polydopamine modification, i.e., in the process of preparing the fly ash porous insulation material, the fly ash substrate was used instead of polydopamine-modified fly ash substrate, and the other conditions were unchanged.
Comparative example 8
Comparative example 8 in comparison with example 3, the fly ash substrate in comparative example 8 was the final product fly ash porous insulation material without polydopamine modification and composite emulsion spray coating, and the other conditions were unchanged.
Experimental example
1. And (3) testing heat preservation performance: the testing method comprises the following steps: the infrared baking lamp with constant power and the self-made open foam box are kept at the same level and are placed on the acrylic base, and a small hole is formed at the rear end of the cavity so that the thermocouple probe stretches into the cavity to record the temperature change process. Firstly, the infrared lamp light is turned on, the positions of the light source and the cavity are fixed, the light is used for heating the cavity irradiation, the blank control is adopted, the fly ash porous thermal insulation material samples prepared in the examples 1-3 and the comparative examples 1-8 are attached to the front end of the cavity to enable the samples to horizontally face the infrared lamp light, thermocouple readings of each group of experiments reach a certain temperature (65 ℃), then the light is turned off, after the equivalent cooling for 900 seconds, the temperature change condition in the cavity in the cooling process is monitored through thermocouple readings, and therefore the thermal insulation performance of each group of fly ash porous thermal insulation materials is achieved. The test results are shown in table 1:
TABLE 1
| Chamber temperature/°c | |
| Blank control group | 26.5 |
| Example 1 | 51.9 |
| Example 2 | 53.8 |
| Example 3 | 52.6 |
| Comparative example 1 | 52.4 |
| Comparative example 2 | 51.6 |
| Comparative example 3 | 51.1 |
| Comparative example 4 | 50.8 |
| Comparative example 5 | 51.2 |
| Comparative example 6 | 50.7 |
| Comparative example 7 | 51.3 |
| Comparative example 8 | 49.5 |
As can be seen from the test results in Table 1, the fly ash porous thermal insulation materials prepared in examples 1-3 of the present invention have excellent thermal insulation properties, and the thermal insulation properties are significantly improved compared with the blank control group. As can be seen from the comparison of comparative examples 2-5 and example 3, the addition of dextrin, calcium oxide, magnesium oxide and sodium oleate in the invention affects the foaming effect of the porous fly ash base material, thereby affecting the heat preservation performance of the fly ash porous heat preservation material; as can be seen from the comparison of comparative example 6 and comparative example 3, the tungsten doped vanadium dioxide of the phase change material has positive influence on the improvement of the heat insulation performance of the fly ash porous heat insulation material; as can be seen from the comparison of the comparative examples 7, 8 and 3, the composite emulsion coating can obviously improve the heat insulation performance of the fly ash porous heat insulation material, and the compatibility of the fly ash substrate and the composite emulsion coating is improved by modifying the fly ash substrate with polydopamine, so that the heat insulation performance of the fly ash porous heat insulation material is improved.
2. Leaching rate of heavy metal from fly ash base material: according to the TCLP procedure, a pH of 2.88 is prepared by adding 5.7mL of acetic acid to 1L of deionized water. The fly ash substrates prepared in examples 1 to 3 and comparative example 1 were ground into fine powder, then passed through a 100-mesh sieve, vibrated in a water bath at room temperature for 18 hours according to a liquid-solid ratio of 20mL:1g, and after standing, the powder was subjected to film coating, and the supernatant was taken and the heavy metal content was measured by inductively coupled plasma atomic absorption spectrometry (ICP-OES). The test results are shown in table 2:
TABLE 2
| Example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Pb leaching content/(mg/L) | 0.032 | 0.025 | 0.029 | 0.088 |
| Cr leaching content/(mg/L) | 0.0089 | 0.0074 | 0.0081 | 0.014 |
| Zn leaching content/(mg/L) | 5.68 | 4.92 | 5.24 | 10.59 |
As can be seen from the test results in Table 2, the leaching rate of heavy metals of the fly ash base materials prepared in examples 1 to 3 of the present invention is far lower than the requirements (according to GB5085.3-2007 hazardous waste identification Standard, leaching limit of lead is 5mg/L, leaching limit of zinc is 100mg/L, and leaching limit of chromium is 5 mg/L), so that the fly ash porous thermal insulation material of the present invention is safe and environment-friendly. As can be seen from comparison of comparative example 1 with example 3 and example, adding red mud during pretreatment can greatly reduce leaching rate of heavy metals in fly ash, and then high temperature during subsequent treatment of fly ash to form fly ash substrate can further fix heavy metals, thereby reducing leaching rate.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The preparation method of the fly ash porous heat-insulating material is characterized by comprising the following steps of:
step (1) mixing fly ash, red mud and sodium hydroxide aqueous solution, ball milling, centrifuging and drying to obtain pretreated fly ash;
step (2) mixing the pretreated fly ash, silicon carbide, dextrin, calcium oxide, magnesium oxide, steel slag and sodium oleate, heating and preserving heat to obtain a fly ash substrate;
immersing the fly ash substrate in Tris-HCl buffer solution, performing ultrasonic treatment, then adding dopamine hydrochloride, heating in a water bath, stirring, taking out the treated fly ash substrate after the reaction is finished, washing, and drying to obtain the polydopamine modified fly ash substrate;
adding vanadium pentoxide, oxalic acid and tungstic acid into deionized water, stirring, reacting, naturally cooling to room temperature, centrifuging, drying and annealing to obtain tungsten doped vanadium dioxide;
step (5) mixing polyethylene glycol with polytetrahydrofuran, dropwise adding isophorone diisocyanate and dibutyltin dilaurate, heating, reacting, adding tungsten doped vanadium dioxide, 2-dimethylolpropionic acid and 1, 4-butanediol after the reaction is finished, cooling, adding deionized water, and homogenizing to obtain a composite emulsion;
and (6) spraying the composite emulsion on the polydopamine modified fly ash substrate, solidifying and drying, and standing at room temperature to obtain the fly ash porous heat insulation material.
2. The method for preparing a porous insulating material for fly ash according to claim 1, wherein in the step (1), the concentration of the aqueous solution of sodium hydroxide is 0.5 to 1mol/L; the dosage ratio of the fly ash, the red mud and the sodium hydroxide aqueous solution is (10-20) kg (2-3) kg (100-300) L; ball milling conditions: ball milling is carried out for 18-28h at the rotating speed of 100-500r/min, zirconia balls with the diameter of 10mm and 6mm are adopted in the number ratio of 49:75, and the ball milling direction is changed every 30min in the ball milling process; drying temperature: 70-90 ℃.
3. The method for preparing the fly ash porous thermal insulation material according to claim 1, wherein in the step (2), the mass ratio of the pretreated fly ash, silicon carbide, dextrin, calcium oxide, magnesium oxide, steel slag and sodium oleate is 100 (0.6-1.0), 8-10, 4-8, 6-12, 4-6 and 0.25-0.55; heating conditions: raising the temperature to 1160-1220 ℃ at the speed of 6-8 ℃/min; the heat preservation time is as follows: 5-15min.
4. The method for preparing a porous insulating material according to claim 1, wherein in the step (3), the pH of Tris-HCl buffer is 8.5; ultrasonic treatment conditions: ultrasonic processing at 20-40KHz frequency at room temperature for 20-40min; water bath heating temperature: 35-45 ℃; stirring conditions: stirring at stirring speed of 150-300r/min for 12-16 hr.
5. The method for preparing a porous insulating material according to claim 1, wherein in the step (3), the washing liquid used for washing comprises deionized water; drying conditions: drying at 50-70deg.C for 20-30 hr; the dosage ratio of dopamine hydrochloride to Tris-HCl buffer is (2.6-5.2) g (120-180) mL.
6. The method for preparing the fly ash porous thermal insulation material according to claim 1, wherein in the step (4), the mass ratio of vanadium pentoxide, oxalic acid, tungstic acid and deionized water is (2-4): 3-6): 0.03-0.3): 500-800; stirring conditions: stirring at 200-400r/min for 20-40min; reaction conditions: heating to 230-250 ℃ for reaction for 20-30h.
7. The method for preparing the porous insulating material according to claim 1, wherein in the step (4), the drying condition is as follows: drying at 40-60deg.C for 10-14 hr; annealing conditions: annealing at 580-620 deg.c for 2.5-3.5 hr.
8. The method for preparing the fly ash porous thermal insulation material according to claim 1, wherein in the step (5), the mass ratio of polyethylene glycol, polytetrahydrofuran, isophorone diisocyanate, dibutyltin dilaurate, tungsten doped vanadium dioxide, 2-dimethylolpropionic acid, 1, 4-butanediol and deionized water is (1.5-3): (8.1-8.2): (0.04-0.1): (0.1-0.2): (0.68-1.32): (0.08-0.2): (37-80).
9. The method for preparing the porous thermal insulation material for fly ash according to claim 1, wherein in the step (5), the mixing condition of polyethylene glycol and polytetrahydrofuran is as follows: mixing at 40-50deg.C; isofluorone diisocyanate, dibutyl tin dilaurate dropwise addition time: 15-25min; temperature rise: 80-90 ℃; reaction conditions: reacting for 2-3h at a stirring speed of 200-400 r/min; and (3) cooling conditions: cooling to 60-70deg.C, stirring for 1.5-2.5 hr, cooling to 40-50deg.C, adding triethylamine to adjust pH to 7, and naturally cooling to 25-30deg.C.
10. The method for preparing the porous thermal insulation material of the fly ash according to claim 1, wherein in the step (6), the curing and drying conditions are that the curing and drying are carried out for 30-40min at 50-60 ℃; the placement time is as follows: 20-30h; the spraying thickness of the composite emulsion is controlled to be 150-200 mu m.
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| CN115385577A (en) * | 2022-10-11 | 2022-11-25 | 张锦彬 | Fly ash thermal insulation cotton and preparation method thereof |
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