CN113429182B - Carbon aerogel cement brick and preparation method thereof - Google Patents
Carbon aerogel cement brick and preparation method thereof Download PDFInfo
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- CN113429182B CN113429182B CN202110696210.9A CN202110696210A CN113429182B CN 113429182 B CN113429182 B CN 113429182B CN 202110696210 A CN202110696210 A CN 202110696210A CN 113429182 B CN113429182 B CN 113429182B
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- 239000004568 cement Substances 0.000 title claims abstract description 70
- 239000011449 brick Substances 0.000 title claims abstract description 69
- 239000004966 Carbon aerogel Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- 239000000843 powder Substances 0.000 claims abstract description 42
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 19
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 19
- 239000011240 wet gel Substances 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims abstract description 9
- 238000000227 grinding Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 15
- 239000004964 aerogel Substances 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 7
- 239000006004 Quartz sand Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 239000002518 antifoaming agent Substances 0.000 claims description 7
- 239000001110 calcium chloride Substances 0.000 claims description 7
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 238000007710 freezing Methods 0.000 claims description 7
- 230000008014 freezing Effects 0.000 claims description 7
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 7
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 7
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 7
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 7
- 239000004816 latex Substances 0.000 claims description 7
- 229920000126 latex Polymers 0.000 claims description 7
- 239000012300 argon atmosphere Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 238000010000 carbonizing Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000002426 superphosphate Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000004108 freeze drying Methods 0.000 abstract description 5
- 239000011259 mixed solution Substances 0.000 abstract description 2
- 238000002791 soaking Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 6
- 239000011381 foam concrete Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000006260 foam Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000002023 wood Substances 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- 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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a carbon aerogel cement brick and a preparation method thereof, the cement brick is prepared by grinding sawdust into powder, dissolving the powder in a sodium hydroxide/polyethylene glycol mixed solution, and then putting the solution into a brick-making mold to prepare wet gel; freeze-drying the wet gel to obtain carbon aerogel blocks; and (3) soaking the carbon aerogel block into cement paste, taking out, and airing to obtain the carbon aerogel cement brick. The strength of the carbon aerogel cement brick can reach more than 20MPa, and according to the strength grade of a common sintered brick of GB/T5101-2017, the strength grade can reach MU20, which shows that the carbon aerogel cement brick has higher compressive strength and can be used for bricks for common houses. The carbon aerogel cement brick has the advantages of small density, high strength, low price, simple production process and the like, and has wide market prospect.
Description
Technical Field
The invention belongs to the technical field of aerogel preparation, and particularly relates to a carbon aerogel cement brick and a preparation method thereof.
Background
High-rise light bricks are generally referred to as foam bricks, also known as: the foamed concrete block is used for the indoor partition wall, and the floor load is not increased. Foam concrete blocks have many advantages: (1) and (3) economy: the construction cost of the foundation can be reduced, the section of the frame is reduced, and the comprehensive construction cost of the building can be obviously saved by saving the reinforced concrete; compared with the solid clay brick, the foam concrete block is designed and used, and the comprehensive cost can be reduced by more than 5%. (2) The practicability is as follows: the use area can be increased by using the foam concrete block, meanwhile, the heat insulation effect is good because the foam brick and the aerated concrete block insulate heat, the indoor temperature is 2-3 ℃ lower than that of a solid clay brick in hot summer, and the electric quantity consumption is reduced by using an air conditioner. (3) Construction property: the light brick has good machinability, is convenient and simple to construct, and can reduce the labor intensity, improve the construction efficiency and shorten the construction period due to large blocks and light weight.
The preparation method of the foam concrete block comprises the following steps: preparing the foaming agent aqueous solution into foam by a physical method, adding the foam into slurry, and preparing the slurry from a cement-based gel material, an additive, water and the like; the foam and the slurry are mixed and stirred, poured and formed, and maintained at high temperature or naturally to form the foam-concrete composite material. However, this manufacturing method requires a complicated process, requires separate foaming equipment, requires a large number of manufacturing equipment, and is expensive. Therefore, the invention of the brick with simple preparation method, excellent application performance and low cost is a difficult problem to be solved urgently.
Currently, the invention of various new bricks is continuously explored, such as: chinese invention patent application No. 201310007950.2 reports a method of manufacturing a lightweight foamed cement tile and a lightweight foamed cement tile using a foaming agent, which increases process complexity and cost; the Chinese patent application No. 201810778157.5 discloses a method for producing cement bricks by using construction waste and pile filling plant cleaning slurry and the cement bricks, the cement bricks prepared by the method have special requirements on raw materials, and the raw material sources of the cement bricks are very lacking in vast rural areas. Literature investigations have shown that cement blocks of various materials have been developed, but they have also been inadequate. The aerogel is a three-dimensional porous light solid material which is formed by mutually aggregating nano-scale particles to form a nano-porous structure and filling gaseous dispersion media in nano-pores. Aerogels are widely used in many fields, but they have not been reported as a raw material for bricks. The aerogel material has the characteristics of light weight, high strength and the like, and has wide development space in the field of brick making.
Disclosure of Invention
The invention provides a solution for the blank of aerogel materials in the field of building material bricks. The invention aims to overcome the defects of the prior art and provides a carbon aerogel cement brick and a preparation method thereof. The technical scheme of the invention provides reference for the application of the aerogel material in the field of building materials.
The invention aims to provide a carbon aerogel cement brick, which is prepared by further grinding sawmilling wood powder, dissolving the ground sawmilling wood powder in a sodium hydroxide/polyethylene glycol mixed solution, stirring the mixture, and putting the mixture into a brick-making mold to prepare wet gel; freeze-drying the wet gel to obtain carbon aerogel blocks; and (3) soaking the carbon aerogel blocks into cement paste, taking out the carbon aerogel blocks, and airing the carbon aerogel blocks to obtain the carbon aerogel cement brick.
Another object of the present invention is to provide a method for preparing the carbon aerogel cement brick, wherein the method comprises the following steps:
(1) pretreatment of sawmilling powder: grinding and sieving the sawmilling powder at 60 ℃ and carrying out vacuum drying for 24h to obtain sawmilling powder of 50-200 meshes;
(2) preparation of wet gel: dissolving sawmilling powder in a sodium hydroxide/polyethylene glycol mixed aqueous solution, mechanically stirring for 6-8 h, then putting into a brick-making mold, and freezing for 12-24 h at the temperature of-15 to-20 ℃; sequentially replacing the treated wet gel with 1% hydrochloric acid solution, deionized water and tert-butyl alcohol;
the brick making mold comprises: 240mm multiplied by 115mm multiplied by 53mm (length multiplied by width multiplied by thickness), the molecular weight of the polyethylene glycol is 2000, the sawmilling powder accounts for 5-10% of the solid-liquid ratio of the sodium hydroxide/polyethylene glycol mixed water solution, and the mass fractions of the sodium hydroxide and the polyethylene glycol in the mixed water solution are 8-12% and 1-1.5% respectively;
(3) preparation of carbon aerogel: then freezing and drying for 48h at the temperature of between 55 and 60 ℃ below zero to prepare an aerogel block; finally carbonizing at 1000 ℃ in an argon atmosphere for 5-10 minutes to obtain sawmilling powder carbon aerogel blocks;
(4) preparing a carbon aerogel cement brick: immersing the sawmilling powder carbon aerogel block into self-leveling cement slurry for 3-5 minutes, taking out, standing for 14-28 days, and naturally drying to obtain a carbon aerogel cement brick;
the preparation method of the self-leveling cement slurry comprises the following steps: weighing a proper amount of common Portland cement 42.5R, sulphoaluminate cement, triple superphosphate (more than 300 meshes), quartz sand (200-300 meshes), redispersible latex powder, a water reducing agent, a defoaming agent, hydroxypropyl methylcellulose, calcium chloride and the like, adding water into the weighed aggregate, and uniformly stirring, wherein the water accounts for 20-25% of the total mass of the aggregate; preferably, the ratio of the raw materials is as follows: 42.5R 30% of ordinary portland cement, 5% of sulphoaluminate cement, 19% of triple superphosphate (more than 300 meshes), 45% of quartz sand (200-300 meshes), 0.5% of redispersible latex powder, 0.1-0.3% of polycarboxylic acid water reducing agent, 0.1% of defoaming agent, 0.05% of hydroxypropyl methyl cellulose and 0.15% of calcium chloride.
The invention has the following remarkable characteristics:
(1) the carbon aerogel cement brick provided by the invention adopts sawmilling powder as a raw material, and the raw material is wide in source, low in price and renewable.
(2) The preparation process of the carbon aerogel cement brick is carbonized in an argon atmosphere, so that the strength of the aerogel is improved; the strength test shows that: the strength of the carbon aerogel cement brick can reach more than 20MPa, and according to the strength grade of a sintered common brick (GB/T5101-2017), the strength grade can reach MU20, which shows that the carbon aerogel cement brick has higher compressive strength and can be used for bricks for common houses.
(3) The inventors of the present application have surprisingly found that sawmilling flour carbon aerogel blocks are immersed in self-leveling cement slurry to produce carbon aerogel cement bricks; so that the prepared carbon aerogel cement brick has the characteristics of smooth surface, moisture resistance, water resistance, obvious strength enhancement and the like.
(4) The carbon aerogel cement brick prepared by the method has the advantages of low density, high strength, low price, simple production process and the like.
Drawings
FIG. 1 Electron micrograph of wood flour carbon aerogel cake a prepared in example 1.
Detailed Description
The examples described below illustrate the invention in detail.
Example 1
In this embodiment, a carbon aerogel cement brick is prepared by the following method, including the steps of:
(1) pretreatment of sawmilling powder: grinding and sieving the sawmilling powder at 60 ℃ and carrying out vacuum drying for 24h to obtain 60-100-mesh sawmilling powder;
(2) preparation of wet gel: dissolving 50g of sawdust into 667mL of a sodium hydroxide/polyethylene glycol mixed aqueous solution, wherein the mass percentages of the sodium hydroxide and the polyethylene glycol in the mixed aqueous solution are respectively 10% and 1.2%; mechanically stirring for 7h, placing into a brick-making mold, and freezing at-18 deg.C for 18 h; sequentially replacing the treated wet gel with 1% hydrochloric acid solution, deionized water and tert-butyl alcohol;
the brick making mold comprises: 240mm × 115mm × 53mm (length × width × thickness), the molecular weight of the polyethylene glycol is 2000;
(3) preparation of carbon aerogel: then freeze-drying for 48h at-58 ℃ to obtain aerogel blocks; finally carbonizing at 1000 ℃ in argon atmosphere for 8 minutes to obtain sawmilling powder carbon aerogel block a, wherein an electron microscope picture of the sawmilling powder carbon aerogel block a is shown in figure 1;
(4) preparing a carbon aerogel cement brick: immersing the sawmilling powder carbon aerogel block into self-leveling cement slurry for 4 minutes, taking out, standing for 21 days, and naturally airing to obtain a carbon aerogel cement brick a;
the preparation method of the self-leveling cement slurry comprises the following steps: weighing 42.5R 300kg of ordinary portland cement, 50kg of sulphoaluminate cement, 190kg of heavy calcium carbonate (more than 300 meshes), 450kg of quartz sand (200-300 meshes), 5kg of redispersible latex powder, 1.5kg of polycarboxylic acid water reducing agent, 1kg of defoaming agent, 0.5kg of hydroxypropyl methyl cellulose and 1.5kg of calcium chloride; adding 220kg of water, and stirring uniformly.
Example 2
In this embodiment, a carbon aerogel cement brick is prepared by the following method, including the following steps:
(1) pretreatment of sawmilling powder: grinding and sieving the sawmilling powder at 60 ℃ and carrying out vacuum drying for 24h to obtain sawmilling powder of 100-180 meshes;
(2) preparation of wet gel: dissolving 50g of sawdust into 1000mL of sodium hydroxide/polyethylene glycol mixed aqueous solution, wherein the mass percentages of the sodium hydroxide and the polyethylene glycol in the mixed aqueous solution are respectively 8% and 1%; mechanically stirring for 6h, placing into a brick-making mold, and freezing at-18 deg.C for 18 h; sequentially replacing the treated wet gel with 1% hydrochloric acid solution, deionized water and tert-butyl alcohol;
the brick making mold comprises: 240mm × 115mm × 53mm (length × width × thickness), the molecular weight of the polyethylene glycol is 2000;
(3) preparation of carbon aerogel: then freeze-drying for 48h at-55 ℃ to obtain aerogel blocks; finally carbonizing at 1000 ℃ in an argon atmosphere for 5 minutes to prepare a sawmilling powder carbon aerogel block b;
(4) preparing a carbon aerogel cement brick: immersing the sawmilling powder carbon aerogel block into self-leveling cement slurry for 3 minutes, taking out, standing for 21 days, and naturally airing to obtain a carbon aerogel cement brick b;
the preparation method of the self-leveling cement slurry comprises the following steps: weighing 42.5R 300kg of ordinary portland cement, 50kg of sulphoaluminate cement, 190kg of heavy calcium (more than 300 meshes), 450kg of quartz sand (200-300 meshes), 5kg of redispersible latex powder, 2kg of polycarboxylic acid water reducing agent, 1kg of defoaming agent, 0.5kg of hydroxypropyl methyl cellulose and 1.5kg of calcium chloride; adding 210kg of water, and stirring uniformly.
Example 3
In this embodiment, a carbon aerogel cement brick is prepared by the following method, including the following steps:
(1) pretreatment of sawmilling powder: grinding and sieving the sawmilling powder at 60 ℃ and carrying out vacuum drying for 24h to obtain 80-150-mesh sawmilling powder;
(2) preparation of wet gel: dissolving 50g of sawdust into 500mL of sodium hydroxide/polyethylene glycol mixed aqueous solution, wherein the mass percentages of the sodium hydroxide and the polyethylene glycol in the mixed aqueous solution are respectively 12% and 1.5%; mechanically stirring for 8h, placing into a brick-making mold, and freezing at-18 deg.C for 18 h; sequentially replacing the treated wet gel with 1% hydrochloric acid solution, deionized water and tert-butyl alcohol;
the brick making mold comprises: 240mm × 115mm × 53mm (length × width × thickness), the molecular weight of the polyethylene glycol is 2000;
(3) preparation of carbon aerogel: then freeze-drying for 48h at-60 ℃ to obtain aerogel blocks; finally carbonizing at 1000 ℃ in argon atmosphere for 10 minutes to prepare sawmilling powder carbon aerogel block c;
(4) preparing a carbon aerogel cement brick: immersing the sawmilling powder carbon aerogel block into self-leveling cement slurry for 5 minutes, taking out, standing for 21 days, and naturally airing to obtain a carbon aerogel cement brick c;
the preparation method of the self-leveling cement slurry comprises the following steps: weighing 42.5R 300kg of ordinary portland cement, 50kg of sulphoaluminate cement, 190kg of heavy calcium carbonate (more than 300 meshes), 450kg of quartz sand (200-300 meshes), 5kg of redispersible latex powder, 2.5kg of polycarboxylic acid water reducing agent, 1kg of defoaming agent, 0.5kg of hydroxypropyl methyl cellulose and 1.5kg of calcium chloride; adding 210kg of water, and stirring uniformly.
Performance examples:
the compression strength of the carbon aerogel cement bricks a, b and c is determined, the test method refers to GB/T5101-2017, and the test results are as follows:
| carbon aerogel cement brick a | Carbon aerogel cement brick b | Carbon aerogel cement brick c | |
| Compressive strength/MPa | 22.3 | 23.1 | 21.6 |
The test result shows that: the compressive strength of the carbon aerogel cement brick reaches more than 20MPa, and according to the strength grade of the common sintered brick (GB/T5101-2017), the strength grade can reach MU20, which shows that the carbon aerogel cement brick has higher compressive strength and can be used for bricks for common houses.
Claims (2)
1. The preparation method of the carbon aerogel cement brick is characterized by comprising the following steps:
(1) pretreatment of sawmilling powder: grinding and sieving the sawmilling powder at 60 ℃, and performing vacuum drying for 24 hours to obtain sawmilling powder of 50-200 meshes;
(2) preparation of wet gel: dissolving sawmilling powder in a sodium hydroxide/polyethylene glycol mixed aqueous solution, mechanically stirring for 6-8 hours, then putting the mixture into a brick making mold, and freezing for 12-24 hours at the temperature of-15 to-20 ℃; sequentially replacing the treated wet gel with 1% hydrochloric acid solution, deionized water and tert-butyl alcohol;
(3) preparation of carbon aerogel: then freezing and drying for 48h at the temperature of between 55 and 60 ℃ below zero to prepare an aerogel block; finally carbonizing at 1000 ℃ in an argon atmosphere for 5-10 minutes to obtain sawmilling powder carbon aerogel blocks;
(4) preparing a carbon aerogel cement brick: immersing the sawmilling powder carbon aerogel block into self-leveling cement slurry for 3-5 minutes, taking out, standing for 14-28 days, and naturally drying to obtain a carbon aerogel cement brick;
the length, width and thickness of the die for making the brick in the step (2) are 240mm, 115mm and 53mm respectively, the molecular weight of polyethylene glycol is 2000, the sawmilling powder accounts for 5-10% of the solid-liquid ratio of the sodium hydroxide/polyethylene glycol mixed aqueous solution, and the mass fractions of the sodium hydroxide and the polyethylene glycol in the mixed aqueous solution are 8-12% and 1-1.5% respectively;
the preparation method of the self-leveling cement slurry in the step (4) comprises the following steps: weighing a proper amount of common Portland cement 42.5R, sulphoaluminate cement, triple superphosphate of more than 300 meshes, quartz sand of 200-300 meshes, redispersible latex powder, a water reducing agent, a defoaming agent, hydroxypropyl methylcellulose and calcium chloride, adding water into the weighed aggregate, and uniformly stirring, wherein the water accounts for 20-25% of the total mass of the aggregate;
42.5R 30% of ordinary portland cement, 5% of sulphoaluminate cement, 19% of triple superphosphate with the granularity of more than 300 meshes, 45% of quartz sand with the granularity of 200-300 meshes, 0.5% of redispersible latex powder, 0.2% of polycarboxylic acid water reducing agent, 0.1% of defoaming agent, 0.05% of hydroxypropyl methyl cellulose and 0.15% of calcium chloride.
2. A carbon aerogel cement brick characterized by being prepared by the method for preparing a carbon aerogel cement brick according to claim 1.
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| CN107265965B (en) * | 2016-04-08 | 2020-02-18 | 南京唯才新能源科技有限公司 | Aerogel foam concrete building block and preparation method thereof |
| CN106824080B (en) * | 2017-03-03 | 2019-11-12 | 中国科学院理化技术研究所 | A kind of high absorption property carbon aerogels and its preparation method and application |
| CN109201013B (en) * | 2018-10-23 | 2021-07-20 | 南阳师范学院 | Preparation method of straw-based carbon aerogel |
| CN112279631A (en) * | 2020-11-04 | 2021-01-29 | 安徽滨江新型墙材有限公司 | Processing technology for reducing crack generation rate in diatomite insulating brick sintering process |
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Effective date of registration: 20240116 Address after: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Dragon totem Technology (Hefei) Co.,Ltd. Address before: 430073 No. 1 Textile Road, Hongshan District, Wuhan City, Hubei Province Patentee before: Wuhan Textile University |