CN111410559B - Heat-insulating coating structure of lift tube and preparation method - Google Patents
Heat-insulating coating structure of lift tube and preparation method Download PDFInfo
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- CN111410559B CN111410559B CN202010239615.5A CN202010239615A CN111410559B CN 111410559 B CN111410559 B CN 111410559B CN 202010239615 A CN202010239615 A CN 202010239615A CN 111410559 B CN111410559 B CN 111410559B
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- 238000000576 coating method Methods 0.000 title claims abstract description 60
- 239000011248 coating agent Substances 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title description 9
- 239000000843 powder Substances 0.000 claims abstract description 39
- 244000144730 Amygdalus persica Species 0.000 claims abstract description 27
- 235000006040 Prunus persica var persica Nutrition 0.000 claims abstract description 27
- -1 cellucotton Substances 0.000 claims abstract description 26
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 17
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 17
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 17
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 14
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 14
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims abstract description 7
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012046 mixed solvent Substances 0.000 claims abstract description 7
- 239000003208 petroleum Substances 0.000 claims abstract description 7
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 7
- 238000000498 ball milling Methods 0.000 claims description 36
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 31
- 238000001035 drying Methods 0.000 claims description 23
- 239000000835 fiber Substances 0.000 claims description 20
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 20
- 229910052582 BN Inorganic materials 0.000 claims description 18
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 18
- 239000000919 ceramic Substances 0.000 claims description 18
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 18
- 239000003365 glass fiber Substances 0.000 claims description 18
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 18
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 18
- 238000004321 preservation Methods 0.000 claims description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- 239000004743 Polypropylene Substances 0.000 claims description 15
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 15
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 229920001155 polypropylene Polymers 0.000 claims description 15
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 15
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 15
- 239000010456 wollastonite Substances 0.000 claims description 15
- 229910052882 wollastonite Inorganic materials 0.000 claims description 15
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 15
- 239000000706 filtrate Substances 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 229920005610 lignin Polymers 0.000 claims description 10
- 229920000591 gum Polymers 0.000 claims description 9
- QAIPRVGONGVQAS-DUXPYHPUSA-N trans-caffeic acid Chemical compound OC(=O)\C=C\C1=CC=C(O)C(O)=C1 QAIPRVGONGVQAS-DUXPYHPUSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 6
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- ACEAELOMUCBPJP-UHFFFAOYSA-N (E)-3,4,5-trihydroxycinnamic acid Natural products OC(=O)C=CC1=CC(O)=C(O)C(O)=C1 ACEAELOMUCBPJP-UHFFFAOYSA-N 0.000 claims description 4
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 4
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 4
- 229940074360 caffeic acid Drugs 0.000 claims description 4
- 235000004883 caffeic acid Nutrition 0.000 claims description 4
- QAIPRVGONGVQAS-UHFFFAOYSA-N cis-caffeic acid Natural products OC(=O)C=CC1=CC=C(O)C(O)=C1 QAIPRVGONGVQAS-UHFFFAOYSA-N 0.000 claims description 4
- 235000011090 malic acid Nutrition 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 3
- 239000001630 malic acid Substances 0.000 claims description 3
- 239000011975 tartaric acid Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000003405 preventing effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 11
- 239000002131 composite material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 244000215068 Acacia senegal Species 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229920000084 Gum arabic Polymers 0.000 description 1
- 239000000205 acacia gum Substances 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003031 feeding effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a heat-insulating coating structure of a lift tube, which has a good heat-insulating effect by virtue of a heat-insulating layer on the inner wall surface of the lift tube and a compact layer coated on the surface of the heat-insulating layer, so that molten aluminum is prevented from being easily slagging on the upper part of the lift tube, and meanwhile, the heat-insulating coating has a good aluminum adhesion preventing effect; according to the heat-insulating coating structure of the lift tube, the heat-insulating layer takes alumina powder, cellucotton, kaolin and mullite powder as raw materials, so that the prepared heat-insulating layer is low in heat conductivity coefficient and good in heat-insulating effect; the heat-insulating layer is also internally provided with gum, specifically peach gum, and the peach gum is pretreated, specifically, firstly, in a mixed solvent of petroleum ether and acetone, sodium tripolyphosphate and diethylenetriamine are added for reaction, then, methacrylic acid is added for reaction, so that the pretreatment is completed, the treated peach gum can further reduce the heat conductivity coefficient, and the heat-insulating effect is improved.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a heat-insulating coating structure of a lift tube and a preparation method thereof.
Background
The liquid lifting pipe is one of key parts on the low-pressure casting machine of the aluminum alloy, and is placed in a heat preservation furnace which is sealed and filled with aluminum liquid of the low-pressure casting machine during working, and aluminum melt (about 700 plus 900 ℃) is forced to move upwards along the liquid lifting pipe by certain air pressure, so that the filling and feeding of the aluminum liquid are realized. And the pressure of 0.08-0.1 MPa is required to be kept in the aluminum liquid mold filling process. Therefore, the lift tube is required to have good air tightness, high temperature resistance, thermal shock resistance and aluminum liquid corrosion resistance, and also to have long-term thermal shock fatigue resistance.
Silicon carbide ceramic is an ideal material for preparing the lift tube, but the heat-conducting property of the lift tube made of the silicon carbide ceramic is good, so that the heat-insulating property is poor, molten aluminum is easy to slag on the upper part of the lift tube in the molten aluminum mold filling process, the actual channel of the lift tube is reduced, and the mold filling and feeding effects are influenced. Improvements in riser tubes are therefore desirable.
Disclosure of Invention
In view of the above, the invention provides a heat preservation coating structure for a lift tube, which has a good heat preservation effect and a good aluminum adhesion prevention effect.
The technical scheme of the invention is realized as follows: the invention provides a silicon carbide ceramic lift tube composite heat-insulating coating, which comprises a heat-insulating layer coated on the inner wall surface of a silicon carbide ceramic lift tube and a compact layer coated on the surface of the heat-insulating layer;
wherein the heat-insulating layer comprises alumina powder, cellucotton, kaolin, mullite powder, sodium carboxymethylcellulose, gum, polypropylene staple fiber and wollastonite; the dense layer comprises boron nitride, aluminum nitride, zirconium silicate, silica sol, lignin fiber and glass fiber.
On the basis of the technical scheme, the preferable mass ratio of the alumina powder, the cellucotton, the kaolin, the mullite powder, the sodium carboxymethylcellulose, the gum, the polypropylene staple fiber and the wollastonite in the heat-insulating layer is 60-80: 12-18: 4-6: 12-16: 3-8: 1-3: 10-15; the mass ratio of boron nitride, aluminum nitride, zirconium silicate, silica sol, lignocellulose and glass fiber in the compact layer is 25-30: 20-25: 10-15: 2-6: 3-6: 1-3.
On the basis of the technical scheme, the thickness of the heat-insulating layer is preferably 5-10 mm, and the thickness of the compact layer is preferably 0.5-1 mm.
The invention also provides a preparation method of the heat-insulating coating structure of the lift tube, which is used for preparing the heat-insulating layer and comprises the following steps:
s1, polishing the inner wall of the silicon carbide ceramic lift tube;
s2, placing alumina powder, kaolin, mullite powder and wollastonite in an acetic acid solution, soaking for 2-4 hours, filtering to obtain a filtrate, mixing the filtrate with cellucotton, polypropylene short fibers and sodium carboxymethylcellulose, ball-milling for 2-4 hours, adding gum and water, and continuing ball-milling for 3-6 hours to obtain a ball-milled product;
s3, coating the ball mill matter on the inner wall of the silicon carbide ceramic riser, and drying for 8-16 h at the temperature of 60-120 ℃ to obtain a heat-insulating layer;
preparing a compact layer on the surface of the heat preservation layer, which comprises the following steps:
a1, mixing boron nitride, aluminum nitride and zirconium silicate, ball-milling for 1-3 h, adding silica sol, continuing ball-milling, coating the materials on the surface of the heat-insulating layer after ball-milling, and drying at the temperature of 60-120 ℃ for 8-16 h;
and A2, mixing the lignocellulose and the glass fiber, adding silica sol, performing ball milling for 3-8 hours, coating the mixture on the surface of the heat-preservation coating formed in A1 after ball milling, and drying the mixture for 8-16 hours at the temperature of 60-120 ℃ to obtain the compact layer.
On the basis of the technical scheme, preferably, before the dense layer is prepared, the prepared heat preservation layer is further soaked in tartaric acid, malic acid and caffeic acid solution for 5-10 min.
On the basis of the above technical scheme, preferably, the gum in S2 is peach gum, and the pretreatment of the peach gum before adding the peach gum is specifically: dissolving peach gum powder in a mixed solvent of petroleum ether and acetone, adding sodium tripolyphosphate and diethylenetriamine, reacting at the temperature of 30-40 ℃ for 1-3 h, then continuously adding methacrylic acid, heating to 50-60 ℃, continuously reacting for 4-6 h, filtering, and drying to finish peach gum pretreatment.
On the basis of the technical scheme, preferably, the filtrate obtained in S2 is treated with a silane coupling agent for 0.5-1 h.
Further preferably, the silane coupling agent is a mixture of a silane coupling agent KH-550, a silane coupling agent KH-560 and a silane coupling agent DL-602.
On the basis of the technical scheme, preferably, the diameter of the lignocellulose is 20-120 nm, the length-diameter ratio is 400-600, and the content of the lignin is 20-40 wt%.
More preferably, the mass ratio of the silane coupling agent KH 550 to the silane coupling agent KH 560 to the silane coupling agent DL 602 is 1-3: 2-4: 3-6.
Compared with the prior art, the heat-insulating coating structure of the lift tube has the following beneficial effects:
(1) according to the heat-insulating coating structure of the lift tube, the heat-insulating layer on the inner wall surface of the lift tube and the compact layer coated on the surface of the heat-insulating layer have good heat-insulating effect, molten aluminum slagging on the upper part of the lift tube is prevented, and meanwhile, the heat-insulating coating has good aluminum adhesion preventing effect;
(2) according to the heat-insulating coating structure of the lift tube, the heat-insulating layer takes alumina powder, cellucotton, kaolin and mullite powder as raw materials, so that the prepared heat-insulating layer is low in heat conductivity coefficient and good in heat-insulating effect; the heat-insulating layer is also internally provided with gum, specifically peach gum, and the peach gum is pretreated, specifically, firstly, in a mixed solvent of petroleum ether and acetone, sodium tripolyphosphate and diethylenetriamine are added for reaction, then, methacrylic acid is added for reaction, so that the pretreatment is completed, the treated peach gum can further reduce the heat conductivity coefficient, and the heat-insulating effect is improved;
(3) according to the heat-insulating coating structure of the lift tube, the compact layer takes boron nitride and aluminum nitride as raw materials, and the wettability of the boron nitride, the aluminum nitride and aluminum liquid is extremely poor, so that the heat-insulating coating structure has good aluminum liquid corrosion resistance; meanwhile, in the preparation process, firstly, boron nitride, aluminum nitride and the like are dried after ball milling, then, the coated lignocellulose and glass fiber are dried again to obtain a compact layer, and the lignocellulose and the glass fiber can be filled in gaps to further improve the density of the heat-insulating coating, so that the heat-insulating coating is smoother, and the aluminum liquid corrosion resistance of the heat-insulating coating is further improved;
(4) according to the heat-insulating coating structure of the lift tube, before the compact layer is prepared, the prepared heat-insulating layer is soaked in the tartaric acid, malic acid and caffeic acid solution, and the binding force between the heat-insulating layer and the compact layer can be further improved after soaking.
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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A heat-insulating coating structure of a lift tube comprises a heat-insulating layer coated on the inner wall surface of a silicon carbide ceramic lift tube and a compact layer coated on the surface of the heat-insulating layer;
wherein the heat-insulating layer comprises alumina powder, cellucotton, kaolin, mullite powder, sodium carboxymethylcellulose, gum, polypropylene staple fiber and wollastonite; the dense layer comprises boron nitride, aluminum nitride, zirconium silicate, silica sol, lignin fiber and glass fiber.
The mass ratio of alumina powder, cellucotton, kaolin, mullite powder, sodium carboxymethylcellulose, gum, polypropylene short fibers and wollastonite in the heat-insulating layer is 60:12:4:12:3:3:1: 10; the mass ratio of boron nitride, aluminum nitride, zirconium silicate, silica sol, lignocellulose and glass fiber in the compact layer is 25:20:10:2:3: 1. Here, peach gum, gum arabic and the like can be used.
The thickness of the heat-insulating layer is 5mm, and the thickness of the compact layer is 0.5 mm.
The preparation method of the composite heat-insulating coating comprises the following steps: firstly, preparing a heat-insulating layer, which comprises the following steps:
s1, polishing the inner wall of the silicon carbide ceramic lift tube;
s2, placing 60 parts by weight of alumina powder, 4 parts by weight of kaolin, 12 parts by weight of mullite powder and 10 parts by weight of wollastonite in 20 parts by weight of 5% acetic acid solution, soaking for 2 hours, filtering to obtain a filtrate, adding 5 parts by weight of silane coupling agent and 20 parts by weight of water into the filtrate, treating at 40 ℃ for 0.5 hour, filtering, drying, then adding 12 parts by weight of cellucotton, 1 part by weight of polypropylene short fiber and 3 parts by weight of sodium carboxymethylcellulose, mixing, and ball-milling for 2 hours; wherein the silane coupling agent comprises a mixture of a silane coupling agent KH 550, a silane coupling agent KH 560 and a silane coupling agent DL 602 in a mass ratio of 1:2: 3;
s3, dissolving 3 parts by weight of peach gum powder in 5 parts by weight of mixed solvent of petroleum ether and acetone, adding 2 parts by weight of sodium tripolyphosphate and 3 parts by weight of diethylenetriamine, reacting at 30 ℃ for 1 hour, then continuously adding 2 parts by weight of methacrylic acid, heating to 50 ℃, continuously reacting for 4 hours, filtering and drying to finish peach gum pretreatment;
s4, adding the pretreated peach gum and 10 parts by weight of water into the nodular material in the S2, and continuing ball milling for 3 hours to obtain a ball milled material; coating the ball mill on the inner wall of a silicon carbide ceramic riser, and drying for 8 hours at 60 ℃ to obtain a heat-insulating layer;
preparing a compact layer on the surface of the heat preservation layer, which comprises the following steps:
a1, mixing 25 parts by weight of boron nitride, 20 parts by weight of aluminum nitride and 10 parts by weight of zirconium silicate, ball-milling for 1 hour, adding 2 parts by weight of silica sol, continuing ball-milling, coating the materials on the surface of the heat-insulating layer after ball-milling, and drying for 8 hours at the temperature of 60 ℃;
a2, mixing 3 parts by weight of lignocellulose and 1 part by weight of glass fiber, adding 2 parts by weight of silica sol, then ball-milling for 3 hours, coating the mixture on the surface of a heat-preservation coating formed in A1 after ball-milling, and drying for 8 hours at the temperature of 60 ℃ to obtain a compact layer; the diameter of the lignocellulose is 20nm, the length-diameter ratio is 400, and the lignin content is 20 wt%.
Example 2
A heat-insulating coating structure of a lift tube comprises a heat-insulating layer coated on the inner wall surface of a silicon carbide ceramic lift tube and a compact layer coated on the surface of the heat-insulating layer;
wherein the heat-insulating layer comprises alumina powder, cellucotton, kaolin, mullite powder, sodium carboxymethylcellulose, gum, polypropylene staple fiber and wollastonite; the dense layer comprises boron nitride, aluminum nitride, zirconium silicate, silica sol, lignin fiber and glass fiber.
The mass ratio of alumina powder, cellucotton, kaolin, mullite powder, sodium carboxymethylcellulose, gum, polypropylene short fibers and wollastonite in the heat-insulating layer is 70:15:5:14:6:5:2: 13; the mass ratio of boron nitride, aluminum nitride, zirconium silicate, silica sol, lignocellulose and glass fiber in the compact layer is 28:22:13:4:5: 2.
The thickness of the heat-insulating layer is 8mm, and the thickness of the compact layer is 0.8 mm.
The preparation method of the composite heat-insulating coating comprises the following steps: firstly, preparing a heat-insulating layer, which comprises the following steps:
s1, polishing the inner wall of the silicon carbide ceramic lift tube;
s2, placing 70 parts by weight of alumina powder, 5 parts by weight of kaolin, 14 parts by weight of mullite powder and 13 parts by weight of wollastonite in 25 parts by weight of 5% acetic acid solution, soaking for 2 hours, filtering to obtain a filtrate, adding 5 parts by weight of silane coupling agent and 20 parts by weight of water into the filtrate, treating at 40 ℃ for 0.5 hour, filtering, drying, then adding 15 parts by weight of cellucotton, 2 parts by weight of polypropylene short fiber and 6 parts by weight of sodium carboxymethylcellulose, mixing, and ball-milling for 2 hours; wherein the silane coupling agent comprises a mixture of a silane coupling agent KH 550, a silane coupling agent KH 560 and a silane coupling agent DL 602 in a mass ratio of 2:3: 4;
s3, dissolving 5 parts by weight of peach gum powder in 7 parts by weight of mixed solvent of petroleum ether and acetone, adding 3 parts by weight of sodium tripolyphosphate and 4 parts by weight of diethylenetriamine, reacting at 30 ℃ for 1 hour, then continuously adding 3 parts by weight of methacrylic acid, heating to 50 ℃, continuously reacting for 4 hours, filtering and drying to finish peach gum pretreatment;
s4, adding the pretreated peach gum and 15 parts by weight of water into the nodular material in the S2, and continuing ball milling for 3 hours to obtain a ball milled material; coating the ball mill on the inner wall of a silicon carbide ceramic riser, and drying at 100 ℃ for 12h to obtain a heat-insulating layer;
preparing a compact layer on the surface of the heat preservation layer, which comprises the following steps: a1, mixing 28 parts by weight of boron nitride, 22 parts by weight of aluminum nitride and 13 parts by weight of zirconium silicate, ball-milling for 1 hour, adding 4 parts by weight of silica sol, continuing ball-milling, coating the materials on the surface of the heat-insulating layer after ball-milling, and drying at 90 ℃ for 12 hours;
a2, mixing 5 parts by weight of lignocellulose and 2 parts by weight of glass fiber, adding 4 parts by weight of silica sol, then ball-milling for 5 hours, coating the mixture on the surface of a heat-preservation coating formed in A1 after ball-milling, and drying the coating for 12 hours at the temperature of 90 ℃ to obtain a compact layer; the diameter of the lignocellulose is 70nm, the length-diameter ratio is 500, and the lignin content is 30 wt%.
Example 3
A heat-insulating coating structure for lift tube is composed of a silicon carbide ceramic layer coated on the inner surface of lift tube
The heat insulation layer and the compact layer coated on the surface of the heat insulation layer are sequentially arranged;
wherein the heat-insulating layer comprises alumina powder, cellucotton, kaolin, mullite powder, sodium carboxymethylcellulose, gum, polypropylene staple fiber and wollastonite; the dense layer comprises boron nitride, aluminum nitride, zirconium silicate, silica sol, lignin fiber and glass fiber.
The mass ratio of alumina powder, cellucotton, kaolin, mullite powder, sodium carboxymethylcellulose, gum, polypropylene short fibers and wollastonite in the heat-insulating layer is 80:18:6:16:8:8:3: 15; the mass ratio of boron nitride, aluminum nitride, zirconium silicate, silica sol, lignocellulose and glass fiber in the compact layer is 30:25:15:6:6: 3.
The thickness of the heat-insulating layer is 10mm, and the thickness of the compact layer is 1 mm.
The preparation method of the composite heat-insulating coating comprises the following steps: firstly, preparing a heat-insulating layer, which comprises the following steps:
s1, polishing the inner wall of the silicon carbide ceramic lift tube;
s2, placing 80 parts by weight of alumina powder, 6 parts by weight of kaolin, 16 parts by weight of mullite powder and 15 parts by weight of wollastonite in an acetic acid solution with the mass concentration of 5% in 28 parts by weight, soaking for 2 hours, filtering to obtain a filtrate, adding 8 parts by weight of silane coupling agent and 23 parts by weight of water into the filtrate, treating at the temperature of 40 ℃ for 0.5 hour, filtering, drying, then adding 18 parts by weight of cellucotton, 3 parts by weight of polypropylene short fiber and 8 parts by weight of sodium carboxymethylcellulose, mixing, and ball-milling for 2 hours; wherein the silane coupling agent comprises a mixture of a silane coupling agent KH 550, a silane coupling agent KH 560 and a silane coupling agent DL 602 in a mass ratio of 3:4: 6;
s3, dissolving 8 parts by weight of peach gum powder in 10 parts by weight of mixed solvent of petroleum ether and acetone, adding 5 parts by weight of sodium tripolyphosphate and 5 parts by weight of diethylenetriamine, reacting at 30 ℃ for 1 hour, then continuously adding 5 parts by weight of methacrylic acid, heating to 50 ℃, continuously reacting for 4 hours, filtering and drying to finish peach gum pretreatment;
s4, adding the pretreated peach gum and 8 parts by weight of water into the nodular material in the S2, and continuing ball milling for 3 hours to obtain a ball milled material; coating the ball mill on the inner wall of a silicon carbide ceramic riser, and drying for 16h at 120 ℃ to obtain a heat-insulating layer;
preparing a compact layer on the surface of the heat preservation layer, which comprises the following steps:
a1, mixing 30 parts by weight of boron nitride, 25 parts by weight of aluminum nitride and 15 parts by weight of zirconium silicate, ball-milling for 3 hours, adding 6 parts by weight of silica sol, continuing ball-milling, coating the materials on the surface of the heat-insulating layer after ball-milling, and drying for 16 hours at the temperature of 120 ℃;
a2, mixing 6 parts by weight of lignocellulose and 3 parts by weight of glass fiber, adding 6 parts by weight of silica sol, then ball-milling for 8 hours, coating the mixture on the surface of a heat-preservation coating formed in A1 after ball-milling, and drying for 16 hours at the temperature of 120 ℃ to obtain a compact layer; the diameter of the lignocellulose is 120nm, the length-diameter ratio is 600, and the lignin content is 40 wt%.
Example 4
The same as example 1, except that the prepared thermal insulation layer was further immersed in tartaric, malic and caffeic acid solutions for 5min before the dense layer was prepared.
Comparative example 1
The difference from example 1 is that peach gum in the heat-insulating layer was prepared without pretreatment.
Comparative example 2
The difference from example 1 is that no lignocellulose and no glass fibres were added in the preparation of the dense layer.
The composite thermal insulation coatings obtained in examples 1-4 and comparative examples 1-2 were tested for thermal conductivity (1000 ℃, W/(m.K)), aluminum liquid etching experiments (750 ℃, 72h, 750 ℃, 100h) and thermal insulation coating density, respectively, and the results are shown in Table 1 below.
TABLE 1 experiment of thermal conductivity and aluminum liquid etching of thermal insulation coating obtained in different examples
As can be seen from Table 1, the composite thermal insulation coating prepared by the embodiment of the invention has the advantages of low thermal conductivity, good thermal insulation effect, high density and no aluminum adhesion.
The bonding force between the thermal insulation layer and the dense layer in test example 1 is 63Mpa, and the bonding force between the thermal insulation layer and the dense layer in comparative example 1 is 51Mpa, which shows that the bonding force between the process temperature layer and the dense layer is good.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides a stalk insulation coating structure which characterized in that: comprises a heat-insulating layer coated on the inner wall surface of the silicon carbide ceramic lift tube and a compact layer coated on the surface of the heat-insulating layer;
wherein the heat-insulating layer comprises alumina powder, cellucotton, kaolin, mullite powder, sodium carboxymethylcellulose, gum, polypropylene staple fiber and wollastonite; the compact layer comprises boron nitride, aluminum nitride, zirconium silicate, silica sol, lignin fiber and glass fiber;
the mass ratio of alumina powder, cellucotton, kaolin, mullite powder, sodium carboxymethylcellulose, gum, polypropylene short fibers and wollastonite in the heat-insulating layer is 60-80: 12-18: 4-6: 12-16: 3-8: 1-3: 10-15; the mass ratio of boron nitride, aluminum nitride, zirconium silicate, silica sol, lignocellulose and glass fiber in the compact layer is 25-30: 20-25: 10-15: 2-6: 3-6: 1-3.
2. The lift tube thermal coating structure of claim 1, wherein: the thickness of the heat preservation layer is 5-10 mm, and the thickness of the compact layer is 0.5-1 mm.
3. A method for preparing a riser tube insulation coating structure according to any one of claims 1 to 2, which is characterized in that: preparing a heat-insulating layer, which comprises the following steps:
s1, polishing the inner wall of the silicon carbide ceramic lift tube;
s2, placing alumina powder, kaolin, mullite powder and wollastonite in an acetic acid solution, soaking for 2-4 hours, filtering to obtain a filtrate, mixing the filtrate with cellucotton, polypropylene short fibers and sodium carboxymethylcellulose, ball-milling for 2-4 hours, adding gum and water, and continuing ball-milling for 3-6 hours to obtain a ball-milled product;
s3, coating the ball mill matter on the inner wall of the silicon carbide ceramic riser, and drying for 8-16 h at the temperature of 60-120 ℃ to obtain a heat-insulating layer;
preparing a compact layer on the surface of the heat preservation layer, which comprises the following steps:
a1, mixing boron nitride, aluminum nitride and zirconium silicate, ball-milling for 1-3 h, adding silica sol, continuing ball-milling, coating the materials on the surface of the heat-insulating layer after ball-milling, and drying at the temperature of 60-120 ℃ for 8-16 h;
and A2, mixing the lignocellulose and the glass fiber, adding silica sol, performing ball milling for 3-8 hours, coating the mixture on the surface of the heat-preservation coating formed in A1 after ball milling, and drying the mixture for 8-16 hours at the temperature of 60-120 ℃ to obtain the compact layer.
4. A method of making a lift tube thermal coating structure as recited in claim 3, wherein: before the compact layer is prepared, the prepared heat preservation layer is soaked in tartaric acid, malic acid and caffeic acid solution for 5-10 min.
5. A method of making a lift tube thermal coating structure as recited in claim 3, wherein: the gum in the S2 is peach gum, and the pretreatment of the peach gum is carried out before adding the peach gum, wherein the pretreatment specifically comprises the following steps: dissolving peach gum powder in a mixed solvent of petroleum ether and acetone, adding sodium tripolyphosphate and diethylenetriamine, reacting at the temperature of 30-40 ℃ for 1-3 h, then continuously adding methacrylic acid, heating to 50-60 ℃, continuously reacting for 4-6 h, filtering, and drying to finish peach gum pretreatment.
6. A method of making a lift tube thermal coating structure as recited in claim 3, wherein: and (8) after the filtrate is obtained in S2, treating the filtrate for 0.5-1 h by using a silane coupling agent.
7. The method of making a lift tube thermal coating structure of claim 6, wherein: the silane coupling agent is a mixture of a silane coupling agent KH-550, a silane coupling agent KH-560 and a silane coupling agent DL-602.
8. A method of making a lift tube thermal coating structure as recited in claim 3, wherein: the diameter of the lignocellulose is 20-120 nm, the length-diameter ratio is 400-600, and the content of the lignin is 20-40 wt%.
9. The method of making a lift tube thermal coating structure of claim 7, wherein: the mass ratio of the silane coupling agent KH 550 to the silane coupling agent KH 560 to the silane coupling agent DL 602 is 1-3: 2-4: 3-6.
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