CN113354357A - Silica aerogel modified thermal insulation masonry mortar and use method thereof - Google Patents
Silica aerogel modified thermal insulation masonry mortar and use method thereof Download PDFInfo
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- CN113354357A CN113354357A CN202110667587.1A CN202110667587A CN113354357A CN 113354357 A CN113354357 A CN 113354357A CN 202110667587 A CN202110667587 A CN 202110667587A CN 113354357 A CN113354357 A CN 113354357A
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- Prior art keywords
- silica aerogel
- masonry mortar
- aerogel modified
- micro bubbles
- thermal insulation
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 76
- 239000004965 Silica aerogel Substances 0.000 title claims abstract description 49
- 238000009413 insulation Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 25
- 239000004964 aerogel Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 21
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 15
- 239000003094 microcapsule Substances 0.000 claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- 235000012239 silicon dioxide Nutrition 0.000 claims description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- 238000004078 waterproofing Methods 0.000 claims description 11
- 239000004113 Sepiolite Substances 0.000 claims description 9
- 235000019355 sepiolite Nutrition 0.000 claims description 9
- 229910052624 sepiolite Inorganic materials 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 7
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims description 7
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 7
- 239000004816 latex Substances 0.000 claims description 7
- 229920000126 latex Polymers 0.000 claims description 7
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 6
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- FXSGDOZPBLGOIN-UHFFFAOYSA-N trihydroxy(methoxy)silane Chemical compound CO[Si](O)(O)O FXSGDOZPBLGOIN-UHFFFAOYSA-N 0.000 claims description 2
- 239000011324 bead Substances 0.000 claims 1
- 238000004321 preservation Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 239000004566 building material Substances 0.000 abstract description 2
- 239000004005 microsphere Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 9
- 239000004567 concrete Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 239000011325 microbead Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 229920002522 Wood fibre Polymers 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002025 wood fiber Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000004017 vitrification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229940115440 aluminum sodium silicate Drugs 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- 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 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- 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
- C04B28/04—Portland 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
- 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
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1066—Oxides, Hydroxides
-
- 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
-
- 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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the field of building materials, and particularly relates to silica aerogel modified thermal insulation masonry mortar and a using method thereof. The silica aerogel modified heat-preservation masonry sand comprises the following components in parts by weight: 40-80 parts of inorganic cementing material; 0.5-1 part of organic cementing material; 10-30 parts of silica aerogel modified vitrified micro bubbles; 4-15 parts of aggregate; 0.1-0.5 part of cellulose ether; 0.1-1.0 part of fiber; 0.1-0.5 part of an accelerator; 0.1-0.5 part of microcapsule waterproof agent. The invention improves the problem of slow setting of the gel material by optimizing the proportion of the components and adding the accelerator, obviously shortens the setting time and improves the compressive strength; meanwhile, the aerogel modified vitrified micro bubbles are adopted, so that the interface performance and the heat insulation performance of the vitrified micro bubbles are improved, the technical problem that the retardation, the mechanical property and the heat insulation performance are mutually exclusive is finally solved, and the effect is obvious.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to silica aerogel modified thermal insulation masonry mortar and a using method thereof.
Background
At present, the external wall insulation system in China mainly adopts organic insulation materials. The heat insulating material has good heat insulating performance, but has the defects of poor weather resistance, easy aging, poor volume stability and the like. Compared with organic heat-insulating materials, the inorganic heat-insulating mortar has the advantages of low cost, high strength, heat insulation, fire prevention, weather resistance and the like, and can form a heat-insulating, fire-proof, crack-resistant, waterproof and seepage-proof heat-insulating system together with the surface layer crack-resistant mortar, the cross-section treatment mortar and auxiliary materials. Therefore, the inorganic thermal insulation mortar has been widely applied to plastering thermal insulation engineering of inner and outer walls of multi-storey and high-rise steel-concrete structure buildings, aerated concrete masonry walls and various brick-concrete structure buildings. However, in order to prevent shrinkage cracking of the vitrified microsphere thermal mortar, anti-crack fibers such as polypropylene fibers or wood fibers are generally added to the thermal mortar. However, polypropylene fibers have smooth surfaces and low surface energy, and have the problems of poor fiber dispersion performance and poor fiber-matrix bonding performance when blended into cement-based materials. Although the wood fiber is easier to be uniformly mixed in the vitrified microsphere thermal mortar system, the wood fiber has the defect of slow setting. Meanwhile, the vitrified microsphere thermal insulation mortar as masonry mortar has the problem that the mechanical property and the thermal insulation property are mutually exclusive.
CN201810935191.9 discloses a masonry mortar combined bag for autoclaved aerated concrete wall, a preparation method and a use method thereof, wherein the masonry mortar combined bag is prepared by mixing building garbage regenerated micro powder, cellulose ether, an air entraining agent, a carbon nano tube, a water reducing agent, lignin fiber and Ca (OH)2Blending the slurry, atomizing into drops, drying to obtain powder, uniformly mixing the powder with cement, and packaging in a bag A; mixing the sand and the recycled fine aggregate of the construction waste and then packaging in a bag B; the masonry mortar for preparing the autoclaved aerated concrete wall by utilizing the building wastes is good in workability (water-retaining property, fluidity, viscosity and adsorbability), simple in process and low in cost, saves resources, is environment-friendly, and does not have heat-insulating property. CN101830673A discloses masonry mortar prepared by using construction waste, CN106007562A discloses dry-mixed mortar prepared by using construction waste recycled aggregate, and CN107032686A discloses dry-mixed masonry mortar and a preparation method thereof, and all indexes of the product are tested to meet the requirements in GB/T25181-2010 premixed mortar. However, the problems of hardening and unstable water content of the ready-mixed mortar still exist in the technologies, and the requirements of the aerated concrete wall cannot be met.
CN201510192072.5 discloses white vitrified microsphere modified thermal insulation masonry mortar, which is prepared by partially replacing aggregate with vitrified microspheres, wherein the mass fraction of each component is as follows: and (3) cementing materials: 47.5-70.5%, vitrified micro bubbles: 10% -35%, aggregate: 3.6-20%, dispersible emulsion powder: 0.3% -2%, hydroxypropyl methyl cellulose ether: 0.1% -0.3%, polypropylene fiber: 0.1% -1.2%, sepiolite fiber: 0.5% -1%, waterproofing agent: 0.1% -0.5%, mortar king: 0.08 to 0.3 percent. The technical performance is excellent, but the problems of retardation, mechanical property and heat insulation performance are mutually exclusive.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the silicon dioxide aerogel modified heat-insulation masonry mortar and the using method thereof, wherein the modified heat-insulation masonry mortar improves the delayed coagulation problem of a gel material by optimizing the component proportion and adding an accelerant, and improves the strength; meanwhile, the silica aerogel modified vitrified micro bubbles are adopted, so that the interface performance and the heat insulation performance of the vitrified micro bubbles are improved, the technical problem that the retardation, the mechanical performance and the heat insulation performance are mutually exclusive is finally solved, and the effect is obvious.
In order to achieve the purpose, the invention provides silica aerogel modified heat-insulation masonry mortar which comprises the following components in parts by weight:
inorganic gelling material: 40-80 parts;
organic gel material: 0.5-1 part;
modifying the vitrified micro bubbles by using the silicon dioxide aerogel: 10-30 parts;
aggregate: 4-15 parts;
cellulose ether: 0.1-0.5 part;
fiber: 0.1-1.0 part;
accelerator (b): 0.1-0.5 part;
microcapsule waterproofing agent: 0.1 to 0.5 portion.
Further, in the technical scheme, the inorganic cementing material is one or more of 32.5 portland cement, aluminum oxide and sodium silicate.
Furthermore, in the technical scheme, the organic cementing material is one or more of polyvinyl alcohol, polyacrylamide and ethylene-vinyl acetate dispersible latex powder.
Further, in the technical scheme, the bulk density of the silica aerogel modified vitrified micro bubbles is 85-100kg/m3。
Further, the preparation method of the silica aerogel modified vitrified micro bubbles in the technical scheme comprises the following steps: adding the vitrified micro bubbles into a reaction kettle, heating to 50-60 ℃ and carrying out pretreatment; premixing a silicon source, a silane coupling agent and ethanol to prepare a mixed solution; and then adding the pretreated vitrified micro bubbles into the mixed solution, adjusting the pH value to 8-10, stirring for 40-50min, standing, aging for 2-4h, taking out the sample, soaking and washing with n-hexane, removing the solution on the surface of the sample, and drying in an oven at 60 ℃ for 12-16h to obtain the silica aerogel modified vitrified micro bubbles.
According to the invention, the silica aerogel modified vitrified micro bubbles are adopted to replace conventional vitrified micro bubbles, so that the interface performance of the modified vitrified micro bubbles is enhanced, the bonding strength between the vitrified micro bubbles and a cementing material is improved, the integrity of the vitrified micro bubbles in the mortar is protected, the mortar can be effectively prevented from sinking, and the problems of uneven dispersion of the aerogel when the aerogel is used alone and obvious reduction of the bonding performance and the mechanical property of the masonry mortar caused by direct mixing of the vitrified micro bubbles and the aerogel can be avoided after the aerogel modified vitrified micro bubbles are used.
Further, in the technical scheme, the mass ratio of the silicon source, the vitrified micro bubbles, the silane coupling agent and the ethanol is 1.8-3:1.5-2.5:0.04-0.06: 1.5-2.
Further, in the above technical solution, the silicon source includes one or more of tetraethyl silicate, tetramethyl silicate and methyl silicic acid.
Further, in the above technical scheme, the accelerator is one or two of lithium carbonate and sodium polyphosphate.
Lithium carbonate is an inorganic compound, slightly soluble in water, more soluble in cold water than in hot water, insoluble in alcohol and acetone, and used as a coagulant in cement admixtures; sodium polyphosphate is colorless to white glassy white powder, has strong dispersing effect, is easy to dissolve in water, has the property of chelating metal ions in aqueous solution, and can disperse and dissolve substances which are difficult to dissolve in water. According to the invention, lithium carbonate or sodium polyphosphate is used as an accelerant, so that the coagulation property and strength of the gel material can be effectively improved.
Further, in the technical scheme, the aggregate is medium sand; the fiber is any one of polypropylene fiber and sepiolite fiber; the viscosity range of the cellulose ether is 100000Pa.s-150000 Pa.s; the microcapsule waterproof agent is organic silicon waterproof agent powder coated by the polyethanol.
According to the invention, the organic silicon waterproof agent is coated by the polyethanol, so that the purity of the organic silicon waterproof agent can be effectively guaranteed, and meanwhile, the integrity and tightness of the micro-capsule structure of the organic silicon waterproof agent can be improved.
The invention also provides a using method of the silica aerogel modified thermal insulation masonry mortar, which comprises the following steps: during construction, the heat-preservation masonry mortar and water are mixed according to the mass ratio of 1:0.4-0.6, quickly stirred for 5-10min, the consistency is controlled to be 60-85mm, and the mixture is kept stand for 3-5min to be used.
The invention has the beneficial effects that: the technology of the invention mainly solves the technical problems that the slow setting and mechanical properties are mutually exclusive with the heat insulation performance and the like, effectively improves the slow setting problem of the gel material by optimizing the component ratio, adding the accelerant and the like, shortens the setting time of the masonry mortar to 3-3.5h, and improves the compressive strength; meanwhile, the aerogel modified vitrified micro bubbles are adopted, so that the interface performance of the vitrified micro bubbles is improved, the problems of nonuniform dispersion, damage to the vitrified micro bubbles and an aerogel structure and the like caused by independent use of the aerogel are effectively avoided, the heat conductivity coefficient is kept at a lower value (the minimum value is 0.054W/m.k), and the heat insulation performance is obviously improved; the invention finally solves the technical problem that the retardation, the mechanical property and the heat insulation property are mutually exclusive, avoids the sinking of the mortar and has obvious effect.
Detailed Description
The experimental procedures in the following examples are conventional unless otherwise specified. The raw materials in the following examples are all commercially available products and are commercially available, unless otherwise specified. The present invention is described in further detail below with reference to examples:
the detection method of each parameter index is carried out according to the requirements of masonry mortar and plastering mortar for autoclaved aerated concrete (jc890-2001) and expanded and vitrified micro-bead thermal insulation mortar (GB T26000-2010).
Example 1: preparation of silica aerogel modified vitrified micro-beads
The preparation method of the silica aerogel modified vitrified micro bubbles comprises the following steps: adding the vitrified micro bubbles into a reaction kettle, heating to 50 ℃ and carrying out pretreatment; premixing a silicon source, a silane coupling agent and ethanol to prepare a mixed solution; and then adding the pretreated vitrified micro bubbles into the mixed solution, adjusting the pH value to 9, stirring for 40min, standing, aging for 3h, taking out the sample, soaking and washing with n-hexane, removing the solution on the surface of the sample, and drying in an oven at 60 ℃ for 14h to obtain the silica aerogel modified vitrified micro bubbles.
Wherein the mass ratio of the silicon source, the vitrified micro bubbles, the silane coupling agent and the ethanol is 2:1.8:0.05: 1.8; the silicon source is a mixture of tetraethyl silicate and tetramethyl silicate in a ratio of 1: 1.
Example 2: 10% silicon dioxide aerogel modified vitrified microsphere and accelerator
The silica aerogel modified thermal insulation masonry mortar comprises the following components in parts by weight:
32.5 Portland Cement: 72.5 percent;
polyvinyl alcohol: 0.8;
modifying the vitrified micro bubbles by using the silicon dioxide aerogel: 10 percent;
medium sand: 15 percent;
cellulose ether: 0.1 percent;
polypropylene fiber: 1.0 percent;
lithium carbonate: 0.1 percent;
microcapsule waterproofing agent: 0.5 percent.
The preparation method of the silica aerogel modified vitrified microsphere refers to example 1.
The preparation method of the silica aerogel modified thermal insulation masonry mortar comprises the following steps: weighing the components according to the proportion, uniformly mixing the inorganic cementing material, the organic cementing material, the aggregate, the cellulose ether and the fiber, then sequentially adding the accelerator, the silica aerogel modified vitrified micro bubbles and the microcapsule waterproof agent, and uniformly mixing to obtain the silica aerogel modified thermal insulation masonry mortar.
The using method comprises the following steps: during construction, the heat-preservation masonry mortar and water are mixed according to the mass ratio of 1:0.4, the mixture is quickly stirred for 5min, the consistency is controlled to be 85mm, and the mixture is kept stand for 3min to be used.
Example 3: 15% silicon dioxide aerogel modified vitrified microsphere and accelerator
The silica aerogel modified thermal insulation masonry mortar comprises the following components in parts by weight:
alumina: 70.7 percent;
polyacrylamide: 0.7 percent;
modifying the vitrified micro bubbles by using the silicon dioxide aerogel: 15 percent;
medium sand: 12 percent;
cellulose ether: 0.2 percent;
sepiolite fibers: 0.8 percent;
sodium polyphosphate: 0.2 percent;
microcapsule waterproofing agent: 0.4 percent.
Wherein, the preparation method of the silica aerogel modified vitrified microsphere refers to the example 1; the preparation method of the silica aerogel modified thermal insulation masonry mortar refers to example 2.
The using method comprises the following steps: during construction, the heat-preservation masonry mortar and water are mixed according to the mass ratio of 1:0.45, quickly stirred for 6min, the consistency is controlled at 80mm, and the mixture is kept stand for 4min to be used.
Example 4: 20% silicon dioxide aerogel modified vitrified microsphere and accelerator
The silica aerogel modified thermal insulation masonry mortar comprises the following components in parts by weight:
32.5 Portland Cement: 67%;
ethylene-vinyl acetate dispersible latex powder: 0.6 percent;
modifying the vitrified micro bubbles by using the silicon dioxide aerogel: 20 percent;
medium sand: 11 percent;
cellulose ether: 0.3 percent;
sepiolite fibers: 0.6 percent;
sodium polyphosphate: 0.35 percent;
microcapsule waterproofing agent: 0.15 percent.
Wherein, the preparation method of the silica aerogel modified vitrified microsphere refers to the example 1; the preparation method of the silica aerogel modified thermal insulation masonry mortar refers to example 2.
The using method comprises the following steps: during construction, the heat-preservation masonry mortar and water are mixed according to the mass ratio of 1:0.5, quickly stirred for 5min, the consistency is controlled at 70mm, and the mixture is kept stand for 4min to be used.
Example 5: 25% silicon dioxide aerogel modified vitrified microsphere and accelerator
The silica aerogel modified thermal insulation masonry mortar comprises the following components in parts by weight:
sodium silicate: 64.4 percent;
ethylene-vinyl acetate dispersible latex powder: 0.5 percent;
modifying the vitrified micro bubbles by using the silicon dioxide aerogel: 25 percent;
medium sand: 8.5 percent;
cellulose ether: 0.3 percent;
sepiolite fibers: 0.7 percent;
sodium polyphosphate: 0.4 percent;
microcapsule waterproofing agent: 0.2 percent.
Wherein, the preparation method of the silica aerogel modified vitrified microsphere refers to the example 1; the preparation method of the silica aerogel modified thermal insulation masonry mortar refers to example 2.
The using method comprises the following steps: during construction, the heat-preservation masonry mortar and water are mixed according to the mass ratio of 1:0.5, the mixture is quickly stirred for 5min, the consistency is controlled to be 70mm, and the mixture is kept stand for 5min to be used.
Example 6: 30% silicon dioxide aerogel modified vitrified microsphere and accelerator
The silica aerogel modified thermal insulation masonry mortar comprises the following components in parts by weight:
32.5 Portland Cement: 40-80 percent;
polyacrylamide: 0.5% -1%;
modifying the vitrified micro bubbles by using the silicon dioxide aerogel: 30 percent;
medium sand: 4 percent;
cellulose ether: 0.5 percent;
polypropylene fiber: 0.1 percent;
lithium carbonate: 0.5 percent;
microcapsule waterproofing agent: 0.1 percent.
Wherein, the preparation method of the silica aerogel modified vitrified microsphere refers to the example 1; the preparation method of the silica aerogel modified thermal insulation masonry mortar refers to example 2.
The using method comprises the following steps: during construction, the heat-preservation masonry mortar and water are mixed according to the mass ratio of 1:0.6, quickly stirred for 10min, the consistency is controlled to be 60mm, and the mixture is kept stand for 5min to be used.
Comparative example 1: 20% of unmodified vitrified micro bubbles and accelerator
The masonry mortar comprises the following components in parts by weight:
32.5 Portland Cement: 67%;
ethylene-vinyl acetate dispersible latex powder: 0.6 percent;
vitrification of the micro-beads: 20 percent;
medium sand: 11 percent;
cellulose ether: 0.3 percent;
sepiolite fibers: 0.6 percent;
sodium polyphosphate: 0.35 percent;
microcapsule waterproofing agent: 0.15 percent.
The masonry mortar was prepared in accordance with example 2.
The using method comprises the following steps: during construction, the heat-preservation masonry mortar and water are mixed according to the mass ratio of 1:0.5, quickly stirred for 5min, the consistency is controlled at 70mm, and the mixture is kept stand for 4min to be used.
Comparative example 2: 20% silica aerogel modified vitrified microbead (without accelerator)
32.5 Portland Cement: 67.35 percent;
ethylene-vinyl acetate dispersible latex powder: 0.6 percent;
modifying the vitrified micro bubbles by using the silicon dioxide aerogel: 20 percent;
medium sand: 11 percent;
cellulose ether: 0.3 percent;
sepiolite fibers: 0.6 percent;
microcapsule waterproofing agent: 0.15 percent.
Wherein, the preparation method of the silica aerogel modified vitrified microsphere refers to the example 1; the masonry mortar was prepared according to example 2.
The using method comprises the following steps: during construction, the heat-preservation masonry mortar and water are mixed according to the mass ratio of 1:0.5, quickly stirred for 5min, the consistency is controlled at 70mm, and the mixture is kept stand for 4min to be used.
Comparative example 3: (silica aerogel modified vitrified microspheres and accelerator were not added)
The masonry mortar comprises the following components in parts by weight:
32.5 Portland Cement: 67.35 percent;
ethylene-vinyl acetate dispersible latex powder: 0.6 percent;
vitrification of the micro-beads: 20 percent;
medium sand: 11 percent;
cellulose ether: 0.3 percent;
sepiolite fibers: 0.6 percent;
microcapsule waterproofing agent: 0.15 percent.
The masonry mortar was prepared in accordance with example 2.
The using method comprises the following steps: during construction, the heat-preservation masonry mortar and water are mixed according to the mass ratio of 1:0.5, quickly stirred for 5min, the consistency is controlled at 70mm, and the mixture is kept stand for 4min to be used.
After the masonry mortar samples in the examples and the comparative examples are formed, the relative performance results of 28d are measured and shown in the table 1.
TABLE 1
From the results in table 1, it can be seen that the thermal conductivity and the setting time of the examples of the present invention are both significantly better than those of the comparative examples, and the dry density and the compressive strength are slightly better than those of the comparative examples.
The effect of the modified vitrified micro bubbles is inspected, and the comparison of the results of the example 4 and the comparative example 1 shows that the thermal conductivity coefficient, the dry density and the compressive strength are obviously reduced after the modified vitrified micro bubbles are added, which shows that the modified vitrified micro bubbles are beneficial to the improvement of the mechanical property and the heat insulation property of the masonry mortar, and have little influence on the condensation effect.
When the effect of the accelerator is considered, the comparison between the results of example 4 and comparative example 2 shows that the setting time and the dry density are obviously reduced after the accelerator is added, which indicates that the retardation of the gel material can be effectively improved by adding the accelerator.
From the results of example 4 and comparative example 3, it can be seen that the thermal conductivity and setting time of the masonry mortar are significantly inferior to those of the masonry mortar of the present invention without modifying the vitrified small bubbles and adding the accelerator, and the dry density is higher than those of the masonry mortar of the present invention either alone or both of them, indicating that the modified vitrified small bubbles and the accelerator have a certain synergistic effect on improving the dry density.
In conclusion, the technology of the invention can effectively solve the technical problem that the retarding and mechanical properties are mutually exclusive with the heat-insulating properties, and has obvious effect.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.
Claims (10)
1. The silica aerogel modified heat-insulation masonry mortar is characterized by comprising the following components in parts by weight:
inorganic gelling material: 40-80 parts;
organic gel material: 0.5-1 part;
modifying the vitrified micro bubbles by using the silicon dioxide aerogel: 10-30 parts;
aggregate: 4-15 parts;
cellulose ether: 0.1-0.5 part;
fiber: 0.1-1.0 part;
accelerator (b): 0.1-0.5 part;
microcapsule waterproofing agent: 0.1 to 0.5 portion.
2. The silica aerogel modified thermal insulation masonry mortar of claim 1, wherein the inorganic cementitious material is one or more of 32.5 portland cement, alumina, and sodium silicate.
3. The silica aerogel modified thermal insulation masonry mortar of claim 1, wherein the organic cementitious material is one or more of polyvinyl alcohol, polyacrylamide and ethylene-vinyl acetate dispersible latex powder.
4. The silica aerogel modified thermal insulation masonry mortar of claim 1, wherein the silica aerogel modified vitrified beads have a bulk density of 85 to 100kg/m3。
5. The silica aerogel modified thermal insulation masonry mortar according to claim 4, wherein the preparation method of the silica aerogel modified vitrified micro bubbles comprises the following steps: adding the vitrified micro bubbles into a reaction kettle, heating to 50-60 ℃ and carrying out pretreatment; premixing a silicon source, a silane coupling agent and ethanol to prepare a mixed solution; and then adding the pretreated vitrified micro bubbles into the mixed solution, adjusting the pH value to 8-10, stirring for 40-50min, standing, aging for 2-4h, taking out the sample, soaking and washing with n-hexane, removing the solution on the surface of the sample, and drying in an oven at 60 ℃ for 12-16h to obtain the silica aerogel modified vitrified micro bubbles.
6. The silica aerogel modified heat-insulating masonry mortar according to claim 5, wherein the mass ratio of the silicon source, the vitrified micro bubbles, the silane coupling agent and the ethanol is 1.8-3:1.5-2.5:0.04-0.06: 1.5-2.
7. The silica aerogel modified insulating masonry mortar of claim 5 or 6, wherein the silicon source comprises one or more of tetraethyl silicate, tetramethyl silicate and methylsilicic acid.
8. The silica aerogel modified thermal masonry mortar of claim 1, wherein the accelerator is one or both of lithium carbonate and sodium polyphosphate.
9. The silica aerogel modified insulating masonry mortar of claim 1, wherein the aggregate is medium sand; the fiber is any one of polypropylene fiber and sepiolite fiber; the viscosity range of the cellulose ether is 100000Pa.s-150000 Pa.s; the microcapsule waterproof agent is organic silicon waterproof agent powder coated by the polyethanol.
10. The use method of the silica aerogel modified thermal insulation masonry mortar according to any one of claims 1 to 9, characterized in that during construction, the thermal insulation masonry mortar and water are mixed according to the mass ratio of 1:0.4-0.6, rapidly stirred for 5-10min, the consistency is controlled to be 60-85mm, and the mixture is allowed to stand for 3-5 min.
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| CN114276069A (en) * | 2021-12-02 | 2022-04-05 | 靖江市恒生混凝土制造有限公司 | Decorative concrete and preparation method thereof |
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| CN114276069A (en) * | 2021-12-02 | 2022-04-05 | 靖江市恒生混凝土制造有限公司 | Decorative concrete and preparation method thereof |
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| CN114988844A (en) * | 2022-06-02 | 2022-09-02 | 亚士创能科技(上海)股份有限公司 | Waterproof decorative mortar and preparation method and application thereof |
| CN115070939A (en) * | 2022-07-22 | 2022-09-20 | 山东科扬机械有限公司 | Preparation method of dry-mixed mortar |
| CN115070939B (en) * | 2022-07-22 | 2023-01-31 | 山东科扬机械有限公司 | Preparation method of dry-mixed mortar |
| CN115636654A (en) * | 2022-11-01 | 2023-01-24 | 深圳市纳路特建材科技有限公司 | Alkali-resistant heat-insulating cement mortar |
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