CN113045284A - Heat-insulating paving tile block based on nano aerogel particles and preparation method thereof - Google Patents
Heat-insulating paving tile block based on nano aerogel particles and preparation method thereof Download PDFInfo
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- CN113045284A CN113045284A CN202110264358.5A CN202110264358A CN113045284A CN 113045284 A CN113045284 A CN 113045284A CN 202110264358 A CN202110264358 A CN 202110264358A CN 113045284 A CN113045284 A CN 113045284A
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- 239000002245 particle Substances 0.000 title claims abstract description 91
- 239000004964 aerogel Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 239000000919 ceramic Substances 0.000 claims abstract description 27
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 25
- 150000002367 halogens Chemical class 0.000 claims abstract description 25
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 23
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 23
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000008367 deionised water Substances 0.000 claims abstract description 21
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000003607 modifier Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- ALVYUZIFSCKIFP-UHFFFAOYSA-N triethoxy(2-methylpropyl)silane Chemical compound CCO[Si](CC(C)C)(OCC)OCC ALVYUZIFSCKIFP-UHFFFAOYSA-N 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000004965 Silica aerogel Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 abstract description 62
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 239000000945 filler Substances 0.000 abstract description 4
- 231100000956 nontoxicity Toxicity 0.000 abstract description 2
- 230000036314 physical performance Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 10
- 238000005266 casting Methods 0.000 description 9
- 239000012774 insulation material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000004321 preservation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000007605 air drying Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
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- 238000010298 pulverizing process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000012745 toughening agent Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a long-life, high-strength and heat-insulation paving tile block special for a steam pipeline based on nano aerogel particles, which comprises the following raw materials in percentage by mass: 30-50% of magnesium oxide, 20-40% of halogen sheets, 0-20% of ceramic fibers and 10-30% of modified nano aerogel particles. The modified nano aerogel is obtained by uniformly performing surface pretreatment on nano aerogel particles by using isobutyl triethoxysilane or methyltrimethoxysilane as a particle surface modifier. The heat-insulating tile block is obtained by mixing the raw materials with deionized water and then pouring and curing, wherein the mass ratio of the deionized water to the total mass of the magnesium oxide and the halogen sheets is (50-80) to (60-80). The heat-insulation paving tile block prepared by the method has the characteristics of long service life, high strength and the like, and the heat loss of a pipeline can be effectively reduced by adding the aerogel as a heat-insulation filler; stable physical performance, no radioactivity, environmental safety, no toxicity and no odor.
Description
Technical Field
The invention belongs to the technical field of heat insulation and preservation of pipelines, and particularly relates to a long-life, high-strength and heat-insulation paving tile block special for a steam pipeline based on nano aerogel particles and a preparation method thereof.
Background
With the continuous release of novel high-efficiency heat insulation materials, the heat insulation materials have permeated into the heat insulation of long steam transmission pipelines and the heat insulation of special parts such as valves, drainage devices, pipe brackets and the like. The tube support is usually heat-conducting via support plates, ribs and a base plate, and transfers the medium heat to the atmosphere. The calculation and actual measurement show that the heat loss of the pipeline bracket accounts for about 20-30% of the total heat loss of the pipeline, so that the important heat insulation of the part needs to be carried out in the construction process.
The common domestic heat preservation method is to use a castable material as a hard heat insulation material, use a ceramic fiber blanket as a soft heat insulation material, combine the ceramic fiber blanket with a steel pipe clamp and process the ceramic fiber blanket and the steel pipe clamp into a heat insulation type pipe support. However, the energy-saving effect of the heat insulation pipe bracket is gradually lost after the heat insulation pipe bracket runs for years, and the main reason of the phenomenon is that (1) the heat insulation, pressure resistance and pressure resistance are not ideal. The performance and quality of the finished product mixture adopted by most thermal insulation pipe carrier manufacturers are restricted, the thermal conductivity coefficient of the product is more than 0.2W/(m.K), the compressive strength is less than 8MPa, and the compressive strength is about 2 MPa. (2) The anti-loosening design fails. Although the pipe bracket adopts the anti-loosening design such as the elastic pad, the creep deformation of the lug plate under the long-term load action and the higher temperature working condition leads to the anti-loosening failure, the pipe bracket and the pipeline generate relative displacement, and the integral heat preservation of the steam pipeline is damaged. (3) The hard insulation blocks are fragile. Under the influence of alternating action of direct stress and secondary stress (load) and temperature difference stress generated by temperature shock in the using process, the tensile strength and toughness of the heat-insulating tile block are insufficient; the used hard heat insulation blocks are cracked due to external impact, vibration and the like in the processes of transportation, loading and unloading and installation in place, so that the heat insulation function of the hard heat insulation blocks is reduced. The reasons show that the heat insulation tile is influenced by the hard heat insulation material of the casting material, the heat conductivity of the raw materials and the like, and the long-term safety and energy-saving requirements of a steam pipeline cannot be met in the using process. Therefore, from the viewpoint of energy conservation, a new high-strength heat-insulating material needs to be developed to solve the problems and ensure that the novel heat-insulating pipe bracket meets the long-term safe and energy-saving operation of the steam pipeline.
In summary, aiming at the problems of poor heat resistance, poor heat preservation effect, low toughness, short service life, high production cost and the like existing in the products and technologies in the existing market, a special heat-insulating bedding tile for a steam pipeline based on nano aerogel particles is needed to solve the problems of poor heat resistance, poor heat preservation effect, low toughness, short service life and the like of the heat-insulating bedding tile in the prior art.
Disclosure of Invention
In view of the prior art, the invention aims to provide a special long-life, high-strength and heat-insulation paving tile for a steam pipeline based on nano aerogel particles and a preparation method thereof. The heat-insulating paving tile prepared by the invention has the characteristics of long service life, high strength and the like, and the heat loss of a pipeline can be effectively reduced by adding aerogel serving as a heat-insulating filler.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a heat insulation bedding tile block based on nano aerogel particles, which comprises the following raw materials in percentage by mass:
30-50% of magnesium oxide, 20-40% of halogen sheets, 0-20% of ceramic fibers and 10-30% of modified nano aerogel particles.
Preferably, the particle size of the magnesium oxide is 0.5-2 μm.
Preferably, the halogen slice is halogen slice powder, and the particle size is 0.5-2 μm.
Preferably, the length of the ceramic fiber is 1-3 mm, and the diameter of the ceramic fiber is 0.3-1 mm.
Preferably, the preparation method of the modified nano aerogel particles comprises the following steps: the surface of the nano aerogel particles is modified by using a particle surface modifier, wherein the particle surface modifier is isobutyl triethoxysilane or methyl trimethoxysilane, and the amount of the particle surface modifier is 1.0-2.5% of the mass of the nano aerogel particles.
More preferably, the nano aerogel particles are silica aerogel particles, and the particle size is 0.5-8 mm.
In a second aspect of the invention, there is provided the use of a nano aerogel particle based insulating shingle in a steam line duct bracket.
In a third aspect of the invention, there is provided a method of making a thermal insulating shingle based on nano aerogel particles, comprising the steps of:
(1) adding deionized water into a stirrer, sequentially adding weighed magnesium oxide, halogen sheets, ceramic fibers and modified nano aerogel particles, and mixing and stirring to obtain a mixture;
(2) and (2) pouring the mixture obtained in the step (1) into a mold, demolding after the pouring is finished for 24 hours, and maintaining in a cool and ventilated environment for at least 48 hours to obtain the heat-insulating paving tile block based on the nano aerogel particles.
Preferably, in the step (1), the conductivity of the deionized water is less than 1; the mass ratio of the deionized water to the total mass of the magnesium oxide and the halogen sheet is (50-80) to (60-80).
Preferably, in the step (1), the ambient temperature at the time of preparation is 5 ℃ to 40 ℃.
The invention has the beneficial effects that:
(1) the invention firstly utilizes the low heat conductivity coefficient of the light aerogel particles as the heat insulation filler, not only improves the heat insulation effect of the heat insulation tile, but also reduces the weight, and then utilizes the high-strength ceramic fiber as the reinforcement of the heat insulation tile, improves the strength of the heat insulation tile, so that the heat insulation tile has heat insulation, light weight and easy carrying construction, can effectively save the cost, and the heat conductivity coefficient of the worth heat insulation tile is lower than 0.120W/(m.k), and the compressive strength of the heat insulation tile is 17.7 MPa.
(2) The nano aerogel heat-insulation tile block has stable physical properties, no radioactivity, safe environment, no toxicity and no odor; the main component is inorganic material, which has non-combustion property.
(3) The heat insulation tile block disclosed by the invention is long in service life, can work in a high-temperature high-pressure-resistant-strength environment for a long time, and can be popularized and applied as a heat insulation material in a pipeline bracket.
Drawings
FIG. 1 is a thermal insulating shingle based on nano-aerogel particles prepared in example 4.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As introduced in the background art, the energy-saving effect of the heat-insulating pipe bracket (heat-insulating tile) in the prior art is gradually lost after running for years, and the main reasons of the phenomenon are that the heat-insulating, pressure-resisting and pressure-resisting performances are not ideal; the performance and quality of the finished product mixture adopted by most thermal insulation pipe carrier manufacturers are restricted, the thermal conductivity coefficient of the product is more than 0.2W/(m.K), the compressive strength is less than 8MPa, and the compressive strength is about 2 MPa. The anti-loosening design is invalid; although the pipe bracket adopts the anti-loosening design such as the elastic pad, the creep deformation of the lug plate under the long-term load action and the higher temperature working condition leads to the anti-loosening failure, the pipe bracket and the pipeline generate relative displacement, and the integral heat preservation of the steam pipeline is damaged. The hard heat insulation blocks are fragile; therefore, the heat insulation tile has the problems of poor heat resistance, poor heat insulation effect, low toughness, short service life and the like.
Based on the technical scheme, the invention aims to provide a special long-life, high-strength and heat-insulation paving tile block for a steam pipeline based on nano aerogel particles, which comprises the following raw materials in percentage by mass: 30-50% of magnesium oxide A, 20-40% of halogen sheet B, 0-20% of ceramic fiber C and 78-30% of modified aerogel particles D10. The formula comprises the following components in percentage by mass:
1)A:B＝(30～50):(20～40)
2)C:(A+B)＝(10～30):(70～100)
3)D:(A+B)＝(20～30):(60～90)
4) deionized water (A + B) ═ 50 to 80 (60 to 80)
According to the invention, nano aerogel particles with low thermal conductivity coefficient are used as key basic fillers, and although the aerogel can be used as a heat insulation material, the problems of high use cost, complex surface modification technology and the like are solved, so that the report that the aerogel is used for a heat insulation tile is not found. In view of the above, the present invention modifies aerogels: isobutyl triethoxy silane or methyl trimethoxy silane is used as a particle surface modifier to carry out uniform surface pretreatment on aerogel particles and then the aerogel particles are used. The surface modifier can form a water repellent treatment layer on the surface of the particles, so that water is inhibited from entering a substrate, and the drying time of tile products is easily shortened; the modifier can be eliminated in the alkaline environment in the tile manufacturing process, and has no influence on the performance and the method of tile products. The main consideration of the existing aerogel particle surface modification technology is that the modifier exists on the particle surface for a long time only in order to realize that the aerogel particles and the aerogel heat insulation felt industrialized products have hydrophobic characteristics in engineering application; the purpose of selecting and using the surface modifier is to not only prevent the particles from absorbing water in the preparation process of the slurry for manufacturing the tile, but also realize the reaction in the maintenance and gelling toughening processes of the tile due to the alkaline environment inside the tile, and finally eliminate the water. The use of the surface modifier not only realizes the effective composition of the aerogel particles and the slurry, but also protects the interior of the aerogel particles from absorbing water and shortens the drying time of tile products.
The ceramic fiber is also used as a toughening agent of the heat insulation tile, although the ceramic fiber reinforced aerogel is reported to be used as a heat insulation material in the prior art, the ceramic fiber is mainly used for modifying the aerogel, and the ceramic fiber short fiber is added in the heat insulation tile and can enhance the compressive strength of the heat insulation tile after being mixed with other raw materials. The problems existing in the prior common castable tile can be effectively solved through the raw materials and the proportion.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the examples of the present invention are all conventional in the art and commercially available.
Example 1
By adopting a spraying mode, once every 5 minutes, 2.5kg of isobutyl triethoxysilane is added into 100kg of silica aerogel particles with the particle size of 4mm, and the mixture is mixed for 1 hour at room temperature to obtain the modified silica aerogel particles.
Example 2
1kg of methyltrimethoxysilane was added to 100kg of silica aerogel particles having a particle size of 2mm by spraying once every 5 minutes, and the mixture was mixed at room temperature for 1 hour to obtain modified silica aerogel particles.
Example 3
A preparation method of a high-strength aerogel heat insulation tile comprises the following steps:
preparation before preparation
1) The preparation environment is clean and tidy, and the sample preparation process is prevented from being polluted by dust; the environmental temperature should be controlled at 5-40 deg.C, the temperature should be lower than 5 deg.C, the temperature should be kept at 40 deg.C, and the temperature should be kept at a lower level.
2) The equipment is prepared, and whether the bolt in the equipment is firm, whether the circuit is safe and whether the equipment has noise must be checked before preparation.
3.) water, rust, oil stain, accumulated slag and other impurities on the equipment must be removed before construction so as not to influence the strength of the material;
(II) a preparation method of the aerogel heat insulation tile block;
(1) material ratio (all are mass ratio)
1)A:B＝40:30
2)C:(A+B)＝10:70
3)D:(A+B)＝20:70
4) And (3) deionized water, (A + B) is 50:70, and the sum of the mass percentages of all the components except the deionized water is 100%.
Wherein: a is magnesium oxide powder, B is halogen piece, C is ceramic fiber, and D is modified silica aerogel particle prepared in example 1. The particle size of the magnesium oxide is 0.5-2 μm, the particle size of the halogen slice powder is 0.5-2 μm, the length of the ceramic fiber is 1-3 mm, and the diameter is 0.3-1 mm.
(2) Mixing;
1) before stirring, starting the stirrer for 1-3 minutes, preheating, adding deionized water into the stirrer, continuously stirring for 1.5-3 minutes, and sequentially adding a small amount of halogen sheets, magnesium oxide, ceramic fibers and modified silicon dioxide aerogel particles for multiple times;
2) pouring and molding the stirred mortar in time, and forbidding secondary water addition;
(3) pouring;
1) adopting a casting method for construction, wherein the installation of a mould meets the standard requirement, and the thickness of each casting layer is strictly controlled; compacting and strickling the virtually paved pouring material by using a tool, closely controlling the matching degree of a pouring sample and a mould, and compacting to the designed thickness;
2) the mold can be dismantled after 24 hours of pouring and certain strength;
(III) curing
And after the construction is finished, maintaining the concrete in a shady and ventilated environment for 3 days.
Tests show that the thermal conductivity coefficient of the aerogel thermal insulation tile block of the embodiment at 25 ℃ is 0.150W/(m.k), and the compressive strength is 13 MPa.
Example 4
Preparation before preparation
1) The preparation environment is clean and tidy, and the sample preparation process is prevented from being polluted by dust; the environmental temperature should be controlled at 5-40 deg.C, the temperature should be lower than 5 deg.C, the temperature should be kept at 40 deg.C, and the temperature should be kept at a lower level.
2) The equipment is prepared, and whether the bolt in the equipment is firm, whether the circuit is safe and whether the equipment has noise must be checked before preparation.
3.) water, rust, oil stain, accumulated slag and other impurities on the equipment must be removed before construction so as not to influence the strength of the material;
(II) a preparation method of the aerogel heat insulation tile block;
(1) material ratio (all are mass ratio)
1)A:B＝35:30
2)C:(A+B)＝12:65
3)D:(A+B)＝23:65
4) And (4) deionized water, (A + B) is 60:70, and the sum of the mass percentages of all the components except the deionized water is 100%.
Wherein: a is magnesium oxide powder, B is halogen piece, C is ceramic fiber, and D is modified silica aerogel particle prepared in example 2. The particle size of the magnesium oxide is 0.5-2 μm, the particle size of the halogen slice powder is 0.5-2 μm, the length of the ceramic fiber is 1-3 mm, and the diameter is 0.3-1 mm.
Mixing;
1) before stirring, starting the stirrer for 1-3 minutes, preheating, adding deionized water into the stirrer, continuously stirring for 1.5-3 minutes, and sequentially adding a small amount of halogen sheets, magnesium oxide, ceramic fibers and modified silicon dioxide aerogel particles for multiple times;
2) pouring and molding the stirred mortar in time, and forbidding secondary water addition;
(3) pouring;
1) adopting a casting method for construction, wherein the installation of a mould meets the standard requirement, and the thickness of each casting layer is strictly controlled; compacting and strickling the virtually paved pouring material by using a tool, closely controlling the matching degree of a pouring sample and a mould, and compacting to the designed thickness;
2) the mold can be dismantled after 24 hours of pouring and certain strength;
(III) curing
After the construction is finished, if in summer, the fingers are subjected to closed maintenance for 24 hours according to the criterion that the surfaces are not stained with mud after the construction is finished, then the maintenance is carried out for 48 hours in a shady and cool ventilation environment, the air flow is kept, and the surfaces are prevented from being exposed to the sun and rain.
Tests show that the thermal conductivity coefficient of the aerogel thermal insulation tile block of the embodiment at 25 ℃ is 0.140W/(m.k), and the compressive strength is 15 MPa.
Example 5
Preparation before preparation
1) The preparation environment is clean and tidy, and the sample preparation process is prevented from being polluted by dust; the environmental temperature should be controlled at 5-40 deg.C, the temperature should be lower than 5 deg.C, the temperature should be kept at 40 deg.C, and the temperature should be kept at a lower level.
2) The preparation equipment is required to check whether a bolt in the equipment is firm, whether a circuit is safe and whether the equipment has noise before preparation.
3.) water, rust, oil stain, accumulated slag and other impurities on the equipment must be removed before construction so as not to influence the strength of the material;
(II) a preparation method of the aerogel heat insulation tile block;
(1) material ratio (all are mass ratio)
1)A:B＝30:30
2)C:(A+B)＝15:60
3)D:(A+B)＝25:60
4) And (3) deionized water, (A + B) is 50:70, and the sum of the mass percentages of all the components except the deionized water is 100%.
Wherein: a is magnesium oxide powder, B is halogen piece, C is ceramic fiber, and D is modified silica aerogel particle prepared in example 1. The particle size of the magnesium oxide is 0.5-2 μm, the particle size of the halogen slice powder is 0.5-2 μm, the length of the ceramic fiber is 1-3 mm, and the diameter is 0.3-1 mm.
(2) Mixing;
1) before stirring, starting the stirrer for 1-3 minutes, preheating, adding deionized water into the stirrer, continuously stirring for 1.5-3 minutes, and sequentially adding a small amount of halogen sheets, magnesium oxide, ceramic fibers and modified silicon dioxide aerogel particles for multiple times;
2) pouring and molding the stirred mortar in time, and forbidding secondary water addition;
(3) pouring;
1) adopting a casting method for construction, wherein the installation of a mould meets the standard requirement, and the thickness of each casting layer is strictly controlled; compacting and strickling the virtually paved pouring material by using a tool, closely controlling the matching degree of a pouring sample and a mould, and compacting to the designed thickness;
2) the mold can be dismantled after 24 hours of pouring and certain strength;
(III) curing
If in summer, the fingers are sealed and maintained for 24 hours after construction according to the principle that the surfaces of the fingers are not stained with mud, then the fingers are maintained for 48 hours in a cool and ventilated environment, air flow is kept, and the surfaces of the fingers are prevented from being exposed to the sun and rain.
Tests show that the thermal conductivity coefficient of the aerogel thermal insulation tile block of the embodiment at 25 ℃ is 0.120W/(m.k), and the compressive strength is 17.7 MPa.
Example 6
Preparation before preparation
1) The preparation environment is clean and tidy, and the sample preparation process is prevented from being polluted by dust; the environmental temperature should be controlled at 5-40 deg.C, the temperature should be lower than 5 deg.C, the temperature should be kept at 40 deg.C, and the temperature should be kept at a lower level.
2) The preparation equipment is required to check whether a bolt in the equipment is firm, whether a circuit is safe and whether the equipment has noise before preparation.
3.) water, rust, oil stain, accumulated slag and other impurities on the equipment must be removed before construction so as not to influence the strength of the material;
(II) a preparation method of the aerogel heat insulation tile block;
(1) material ratio (all are mass ratio)
1)A:B＝30:40
2)C:(A+B)＝0:70
3)D:(A+B)＝30:70
4) And (3) deionized water, (A + B) is 50:70, and the sum of the mass percentages of all the components except the deionized water is 100%.
Wherein: a is magnesium oxide powder, B is halogen piece, C is ceramic fiber, and D is modified silica aerogel particle prepared in example 1. The particle size of the magnesium oxide is 0.5 to 2 μm, and the particle size of the halogen tablet powder is 0.5 to 2 μm.
(2) Mixing;
1) before stirring, starting the stirrer for 1-3 minutes, preheating, adding deionized water into the stirrer, continuously stirring for 1.5-3 minutes, and sequentially adding the halogen sheets, the magnesium oxide and the modified silicon dioxide aerogel particles for multiple times in a small amount;
2) pouring and molding the stirred mortar in time, and forbidding secondary water addition;
(3) pouring;
1) adopting a casting method for construction, wherein the installation of a mould meets the standard requirement, and the thickness of each casting layer is strictly controlled; compacting and strickling the virtually paved pouring material by using a tool, closely controlling the matching degree of a pouring sample and a mould, and compacting to the designed thickness;
2) the mold can be dismantled after 24 hours of pouring and certain strength;
(III) curing
If in summer, the fingers are sealed and maintained for 24 hours after construction according to the principle that the surfaces of the fingers are not stained with mud, then the fingers are maintained for 48 hours in a cool and ventilated environment, air flow is kept, and the surfaces of the fingers are prevented from being exposed to the sun and rain.
Tests show that the thermal conductivity coefficient of the aerogel thermal insulation tile block of the embodiment at 25 ℃ is 0.126W/(m.k), and the compressive strength is 12.6 MPa.
Comparative example 1
The modified silica aerogel particles in the example 5 are replaced by perlite particles, the particle size is the same as that of the example 5, and the rest are unchanged, so that the heat-insulating tile block is prepared. The test shows that the heat conductivity coefficient of the heat insulation tile at 25 ℃ is 0.16W/(m.k), and the compressive strength is 14.4 MPa.
Comparative example 2
The modified silica aerogel particles of example 5 were replaced with unmodified ordinary silica aerogel particles having the same particle size as in example 5, and the air-drying curing time was at least 72 hours. And other conditions are unchanged, and the heat insulation tile is prepared. The test shows that the heat conductivity coefficient of the heat insulation tile at 25 ℃ is 0.13W/(m.k), and the compressive strength is 16.9 MPa.
Test example: aging test
The heat insulation tiles prepared in examples 3-5 and comparative examples 1-2 were placed in an aging oven at 300 ℃ 7d, and after being taken out, the heat conductivity and compressive strength of the heat insulation tiles were tested and the rate of change was calculated, and the results are shown in table 1.
TABLE 1
The heat insulation tile of the invention is placed in a steam pipeline bracket and needs to support the weight of a steam pipeline; because the steam pipeline temperature is higher, heat transfer to in the thermal-insulated tile, the time can make thermal-insulated tile fracture, pulverization for a long time, has reduced the life of thermal-insulated tile. The aging test shows that the heat insulation capacity of the heat insulation tile blocks prepared in the examples 3-5 is slightly reduced, but the compressive strength is increased; the heat insulation effect and the compressive strength of the composite material are superior to those of comparative examples 1-2. The heat insulation tile block prepared by the invention has excellent aging performance, the heat conductivity coefficient and the compressive strength of the heat insulation tile block are changed slightly, and the heat insulation tile block can be used in a high-temperature environment for a long time.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A heat-insulating paving tile based on nano aerogel particles is characterized by comprising the following raw materials in percentage by mass:
30-50% of magnesium oxide, 20-40% of halogen sheets, 0-20% of ceramic fibers and 10-30% of modified nano aerogel particles.
2. The nano-aerogel particle-based insulating shingle of claim 1, wherein the magnesium oxide has a particle size of 0.5 to 2 μm.
3. The nano-aerogel particle-based insulating bedding tile of claim 1, wherein the halogen flakes are halogen flake powder having a particle size of 0.5-2 μm.
4. The nano-aerogel particle-based, thermally insulating shingle of claim 1, wherein the ceramic fibers have a length of 1 to 3mm and a diameter of 0.3 to 1 mm.
5. The nano-aerogel particle-based insulating shingle of claim 1, wherein the modified nano-aerogel particles are prepared by: the surface of the nano aerogel particles is modified by using a particle surface modifier, wherein the particle surface modifier is isobutyl triethoxysilane or methyl trimethoxysilane, and the amount of the particle surface modifier is 1.0-2.5% of the mass of the nano aerogel particles.
6. The nano-aerogel particle-based thermal insulating shingle of claim 5, wherein the nano-aerogel particles are silica aerogel particles and have a particle size of 0.5-8 mm.
7. Use of a nano aerogel particle based insulating shingle of any of claims 1 to 6 in a steam line duct bracket.
8. The method of making a nano aerogel particle based insulating shingle of any of claims 1 to 6, comprising the steps of:
(1) adding deionized water into a stirrer, sequentially adding weighed magnesium oxide, halogen sheets, ceramic fibers and modified nano aerogel particles, and mixing and stirring to obtain a mixture;
(2) and (2) pouring the mixture obtained in the step (1) into a mold, demolding after the pouring is finished for 24 hours, and maintaining in a cool and ventilated environment for at least 48 hours to obtain the heat-insulating paving tile block based on the nano aerogel particles.
9. The method according to claim 8, wherein the ambient temperature at the time of the production in the step (1) is 5 to 40 ℃.
10. The method according to claim 8, wherein in the step (1), the deionized water has a conductivity of less than 1; the mass ratio of the deionized water to the total mass of the magnesium oxide and the halogen sheet is (50-80) to (60-80).
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