CN115057647A - Preparation method of modified aerogel and application of modified aerogel in composite insulation board - Google Patents
Preparation method of modified aerogel and application of modified aerogel in composite insulation board Download PDFInfo
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- CN115057647A CN115057647A CN202210767218.4A CN202210767218A CN115057647A CN 115057647 A CN115057647 A CN 115057647A CN 202210767218 A CN202210767218 A CN 202210767218A CN 115057647 A CN115057647 A CN 115057647A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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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
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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
- C04B28/06—Aluminous cements
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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
- 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
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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
- 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
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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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses a preparation method of modified aerogel and application of the modified aerogel in a composite insulation board, wherein the preparation method of the modified aerogel comprises the steps of adding a certain amount of dispersing agent into a certain amount of water, then directly conveying the aerogel to the bottom of a mixed solution containing the dispersing agent and the water after adsorbing the aerogel by negative pressure, and dispersing the aerogel in an aqueous solution under high-speed shearing and stirring to obtain an aqueous solution containing the modified aerogel, wherein the dispersing agent is as follows: aerogel: the weight ratio of water is 1-2:1: 100. The modified aerogel is applied to the preparation of the composite polyphenyl insulation board, so that the hydrophobic aerogel is uniformly dispersed into the polyphenyl board, the heat conductivity coefficient of the insulation board is effectively reduced, the water absorption of the insulation board is reduced, and the durability of the insulation board is enhanced. The method is simple to operate and convenient to realize, the aerogel and polyphenyl particle insulation board is compounded through process improvement, and the performance of the insulation board is optimized.
Description
Technical Field
The invention belongs to the technical field of aerogel, relates to modification of silicon dioxide aerogel, and particularly relates to a preparation method of modified aerogel and application of the modified aerogel in a composite insulation board.
Background
Aerogels are inherently hydrophilic, and during the gradual absorption of water vapor, they undergo changes in their molecular structure, such as size reduction, and even complete destruction, which results in loss of their excellent thermal insulation properties, and are therefore often chemically modified to be hydrophobic. However, hydrophobic aerogels are difficult to be uniformly dispersed in other materials, so that it is important to modify the hydrophobic aerogels to effectively compound the hydrophobic aerogels with other materials.
The existing heat insulation materials in China are mainly divided into organic heat insulation materials, inorganic heat insulation materials and composite materials. The organic heat insulation materials mainly comprise extruded polystyrene boards, molded polystyrene boards, polyurethane foam boards and the like, and the organic heat insulation boards have low heat conductivity coefficient, but have poor combustion performance, are usually B-level combustible and are easy to cause fire; inorganic insulation boards mainly include rock wool boards, glass wool boards, foamed cement boards and the like, and although the materials have good incombustibility, the thermal conductivity coefficient of the materials is too high. Therefore, it is important to have good heat insulation effect and incombustibility. The composite insulation board is generally compounded by organic materials and inorganic materials, so that the composite insulation board keeps good heat insulation effect and incombustibility, the rubber powder polyphenyl particle insulation board is a representative material, and in order to further reduce the heat insulation coefficient, the rubber powder polyphenyl particle insulation board is compounded with modified aerogel, so that a better effect can be achieved.
CN109721312A discloses that aerogel is modified by using silane coupling agent, the aerogel and EPS particles are uniformly mixed in the preparation process to prepare AG/EPS mixture, the density of the aerogel is 3.55 kg/cubic meter and is only 2.75 times of the air density, the AG/EPS mixture is called blue smoke, and the density of the EPS particles is 18-30kg/m 3 The two materials have great density difference and are difficult to uniformly mix, a coupling agent alcohol solution prepared from a coupling agent and absolute ethyl alcohol is uniformly sprayed on the AG/EPS mixture, the AG/EPS mixture accumulated on the surface is easily sprayed by liquid, and the coupling modification effect is realized, but the AG/EPS mixture accumulated at the bottom is difficult to realize uniformity, so that the preparation of the aerogel modified composite insulation board is difficult to effectively realize by the existing preparation technology.
Disclosure of Invention
It is an object of the present invention to provide a method for producing a modified aerogel, which can disperse a hydrophobic aerogel in an aqueous solution relatively easily.
The second purpose of the invention is to provide the application of the modified aerogel prepared by the preparation method in the composite insulation board, and the modified aerogel composite polyphenyl insulation board can achieve good heat insulation effect and has A-grade non-combustible insulation performance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a method for preparing a modified aerogel, comprising the steps of: adding a certain amount of dispersant into a certain amount of water, then directly conveying aerogel to the bottom of a mixed solution containing the dispersant and the water after adsorbing the aerogel under negative pressure, and dispersing aerogel in the aqueous solution under high-speed shearing stirring to obtain an aqueous solution containing modified aerogel, wherein the dispersant: aerogel: the weight ratio of water is 1-2:1: 100.
Preferably, the aerogel is hydrophobic silica aerogel, and the particle size is 1-100 nm.
Preferably, the dispersant is a nano-type silicon dispersant.
Preferably, the rotating speed of the high-speed shearing stirring is 3000-5000r/min, and the time is 10-30 min.
In a second aspect, the invention provides an application of the modified aerogel prepared by the preparation method in a composite insulation board, and the application comprises the following steps:
A. mixing and stirring 800-1200 parts of cement, 10-30 parts of water reducing agent and 10-20 parts of binder for 60-90 s;
B. and B, diluting the obtained aqueous solution containing the modified aerogel with water, and mixing the diluted aqueous solution with the mixed powder obtained in the step A in a ratio of 0.4-0.5: 1 for 90-120s to obtain the cement slurry containing aerogel;
C. b, mixing the cement slurry obtained in the step B and 80-120 parts of EPS particles, stirring for 60-120s, pouring the uniformly mixed aerogel polyphenyl particles into a mould, performing compression molding by using the pressure of 3-5MPa and different compression ratios, standing for 1-3 days, waiting for the heat insulation board to be hardened, and then demolding;
E. and (4) after demolding, placing for 3-5 days under natural conditions, and cutting the sample according to different size requirements.
Preferably, the cement is Portland cement and/or sulphoaluminate cement, with a strength rating of 42.5 or 52.5.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 20-30%.
Preferably, the binder is hydroxypropyl methylcellulose (HPMC) and has a viscosity of 8w-10 w.
Preferably, the EPS particles are secondary foaming particles with the particle size of 2-5 mm.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the hydrophobic aerogel is dispersed into the solution in a dispersing agent and high-speed stirring manner, and then is uniformly dispersed into the polyphenyl insulation board through the aqueous solution, so that the heat conductivity coefficient is effectively reduced, the incombustibility of the polyphenyl insulation board is increased, and the strength loss is avoided.
2. The method for preparing the composite insulation board by the modified aerogel is simple to operate and convenient to implement, does not produce other harmful and polluting substances in the implementation process, and realizes the compounding of the aerogel and the polyphenyl particle insulation board through the improvement on the process.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The proportions of the raw materials in the following examples are in parts by weight.
Example 1
A. Preparation of aerogel solution: firstly, mixing and uniformly stirring 10 parts of nano-silicon dispersing agent and 100 parts of water, then sucking 10 parts of hydrophobic silicon dioxide aerogel through negative pressure, directly conveying the aerogel to the bottom of a solution, stirring at a high speed of 4000r/min for 20min to disperse and dissolve the aerogel into an aqueous solution, and adding 400 parts of water for dilution for later use.
B. Mixing and stirring 800 parts of PO42.5 ordinary portland cement, 10 parts of polycarboxylic acid water reducing agent and 10 dry powder of hydroxypropyl methyl cellulose for 60 s.
C. Mixing the aqueous solution containing the modified aerogel obtained in the step A and the mixed powder obtained in the step B in a ratio of 0.4: 1 for 90 seconds to obtain the aerogel-containing cement slurry.
D. C, mixing and stirring the cement slurry obtained in the step C and 80 parts of EPS particles for 90s, pouring the uniformly mixed aerogel polyphenyl particles into a mould, and using 3MPa pressure to perform mixing according to the weight ratio of 3: 2, molding under a compression ratio, standing for 1 day, waiting for the insulation board to be hardened, and then demolding.
E. After demolding, the sample is placed for 3 days under natural conditions and cut according to different size requirements.
Example 2
A. Preparation of aerogel solution: firstly, mixing and uniformly stirring 15 parts of nano-silicon dispersing agent and 100 parts of water, then sucking 10 parts of hydrophobic silicon dioxide aerogel through negative pressure, directly conveying the aerogel to the bottom of a solution, stirring at a high speed of 4000r/min for 15min to disperse and dissolve the aerogel into an aqueous solution, and adding 400 parts of water for dilution for later use.
B. 1000 parts of PO42.5 ordinary portland cement, 20 parts of polycarboxylic acid water reducing agent and 15 parts of hydroxypropyl methyl cellulose dry powder are mixed and stirred for 90 s.
C. Mixing the aqueous solution containing the modified aerogel obtained in the step A and the mixed powder obtained in the step B in a ratio of 0.45: 1 for 750 seconds to obtain the aerogel-containing cement slurry.
D. C, mixing the cement slurry obtained in the step C with 100 parts of EPS particles, stirring for 80s, pouring the uniformly mixed aerogel polyphenyl particles into a mould, and mixing according to the weight ratio of 5: 3, molding under a compression ratio, standing for 1 day, waiting for the insulation board to be hardened, and then demolding.
E. After demolding, the sample is placed for 3 days under natural conditions and cut according to different size requirements.
Example 3
A. Preparation of aerogel solution: firstly, mixing and uniformly stirring 20 parts of nano-silicon dispersing agent and 100 parts of water, then sucking 10 parts of hydrophobic silicon dioxide aerogel through negative pressure, directly conveying the aerogel to the bottom of a solution, stirring at a high speed of 5000r/min for 10min to disperse and dissolve the aerogel into an aqueous solution, and adding 400 parts of water for dilution for later use.
B. 1200 parts of PO42.5 ordinary portland cement, 30 parts of polycarboxylic acid water reducing agent and 20 dry powder of hydroxypropyl methyl cellulose are mixed and stirred for 80 s.
C. Mixing the aqueous solution containing the modified aerogel obtained in the step A and the mixed powder obtained in the step B in a ratio of 0.5: 1 for 90 seconds to obtain the aerogel-containing cement slurry.
D. C, mixing and stirring the cement slurry obtained in the step C and 120 parts of EPS particles for 120s, pouring the uniformly mixed aerogel polyphenyl particles into a mould, and mixing the aerogel polyphenyl particles with 3MPa according to the pressure of 5: 4, molding, then placing for 1 day, waiting for the heat insulation board to be hardened, and then demolding.
E. After demolding, the sample is placed for 3 days under natural conditions and cut according to different size requirements.
Comparative example
A. Taking 100 parts of water, adding 10 parts of hydrophobic silica aerogel, stirring for 20min to disperse and dissolve the aerogel into the aqueous solution, and adding 400 parts of water for dilution for later use.
B. 800 parts of PO42.5 ordinary portland cement, 10 parts of polycarboxylic acid water reducing agent and 10 dry powder of hydroxypropyl methyl cellulose are mixed and stirred for 60 s.
C. Mixing the aqueous solution containing aerogel obtained in the step A and the mixed powder obtained in the step B in a ratio of 0.4: 1 for 90 seconds to obtain the aerogel-containing cement slurry.
D. C, mixing and stirring the cement slurry obtained in the step C and 80 parts of EPS particles for 90s, pouring the uniformly mixed aerogel polyphenyl particles into a mould, and using 3MPa pressure to perform mixing according to the weight ratio of 3: 2, molding under a compression ratio, then standing for 1 day, waiting for the heat insulation plate to be hardened, and then demolding.
E. After demolding, the sample is placed for 3 days under natural conditions and cut according to different size requirements.
The cement used in the above examples may be PO52.5 portland cement, PO42.5 sulphoaluminate cement, PO52.5 sulphoaluminate cement, or the like, in addition to PO42.5 portland cement.
The particle size of the hydrophobic silica aerogel used in the above examples is 1 to 100 nm.
The water reducing rate of the polycarboxylic acid water reducing agent used in the above embodiment is between 20% and 30%.
The hydroxypropylmethylcellulose used in the above examples had a viscosity of 8w to 10 w.
The EPS particles used in the above examples were secondary expanded particles having a particle diameter of 2 to 5 mm.
The products prepared by different process parameters are subjected to performance tests (refer to JC/T2357-2016 standard), and the results are shown in Table 1.
TABLE 1 Performance test results of the polystyrene boards prepared in examples 1-3 and comparative example
As can be seen from table 1, the aerogel modified polystyrene insulation board products prepared in embodiments 1 to 3 of the present invention have a low thermal conductivity coefficient, a flame retardant coefficient of a level a2, and good thermal insulation and flame retardant properties while ensuring a certain strength; and the aerogel of direct addition of comparative example 1 preparation, the aerogel dispersion is inhomogeneous, and the reunion of embracing in the thermal insulation board makes the intensity of heated board obviously descend coefficient of heat conductivity obviously higher, and weatherability also obviously reduces to the aerogel of embracing can not play effectual effect in the thermal insulation board, can not reduce coefficient of heat conductivity, so the coefficient of heat conductivity of comparative example is higher.
The aerogel modification method of the invention ensures that the hydrophobic aerogel is uniformly distributed in the composite insulation board, has simple operation, does not generate other harmful and polluting substances in the implementation process, and realizes the compounding of the aerogel and the polyphenyl particle insulation board through the improvement on the process. The process provided by the invention can be used for industrial production, and is beneficial to development of green buildings and application of heat-insulating materials.
Claims (9)
1. The preparation method of the modified aerogel is characterized by comprising the following steps of: adding a certain amount of dispersant into a certain amount of water, then directly conveying aerogel to the bottom of a mixed solution containing the dispersant and the water after adsorbing the aerogel under negative pressure, and dispersing aerogel in the aqueous solution under high-speed shearing stirring to obtain an aqueous solution containing modified aerogel, wherein the dispersant: aerogel: the weight ratio of water is 1-2:1: 100.
2. The method for preparing modified aerogel according to claim 1, wherein the aerogel is hydrophobic silica aerogel and has a particle size of 1-100 nm.
3. The method for preparing modified aerogel according to claim 1, wherein the dispersant is nano-silicon dispersant.
4. The method as claimed in claim 1, wherein the rotation speed of the high-speed shear stirring is 3000-5000r/min for 10-30 min.
5. The application of the modified aerogel prepared by the preparation method of any one of claims 1 to 4 in composite insulation boards is characterized by comprising the following steps:
A. mixing and stirring 800-1200 parts of cement, 10-30 parts of water reducing agent and 10-20 parts of binder for 60-90 s;
B. diluting the modified aerogel-containing aqueous solution prepared by the preparation method of any one of claims 1 to 4 by adding water, and mixing the diluted modified aerogel-containing aqueous solution with the mixed powder obtained in the step A at a ratio of 0.4-0.5: 1 for 90-120s to obtain the cement slurry containing aerogel;
C. b, mixing the cement slurry obtained in the step B and 80-120 parts of EPS particles, stirring for 60-120s, pouring the uniformly mixed aerogel polyphenyl particles into a mould, performing compression molding by using the pressure of 3-5MPa and different compression ratios, standing for 1-3 days, waiting for the heat insulation board to be hardened, and then demolding;
E. and (4) after demolding, placing for 3-5 days under natural conditions, and cutting the sample according to different size requirements.
6. The use of the modified aerogel in composite insulation panels according to claim 5, wherein the cement is Portland cement and/or sulphoaluminate cement with a strength rating of 42.5 or 52.5.
7. The application of the modified aerogel in the composite insulation board according to claim 5 is characterized in that the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 20-30%.
8. The use of the modified aerogel in composite insulation boards according to claim 5, wherein the binder is hydroxypropyl methylcellulose and has a viscosity of 8w to 10 w.
9. The application of the modified aerogel in the composite insulation board according to claim 5, wherein the EPS particles are secondary foaming particles with the particle size of 2-5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210767218.4A CN115057647A (en) | 2022-07-01 | 2022-07-01 | Preparation method of modified aerogel and application of modified aerogel in composite insulation board |
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| CN202210767218.4A CN115057647A (en) | 2022-07-01 | 2022-07-01 | Preparation method of modified aerogel and application of modified aerogel in composite insulation board |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180354849A1 (en) * | 2015-06-15 | 2018-12-13 | DEUTSCHES ZENTRUM FüR LUFT-UND RAUMFAHRT E.V. | High-performance concrete comprising aerogel pellets |
| CN109721312A (en) * | 2019-03-13 | 2019-05-07 | 北京新时代寰宇科技发展有限公司 | A kind of A grades of non-ignitable aeroge polyphenylene heat insulation slab and preparation method thereof |
| CN114656215A (en) * | 2022-04-02 | 2022-06-24 | 山西阳中新材有限责任公司 | Aerogel inorganic composite A-grade polyphenyl non-combustible heat preservation plate and preparation method thereof |
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- 2022-07-01 CN CN202210767218.4A patent/CN115057647A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180354849A1 (en) * | 2015-06-15 | 2018-12-13 | DEUTSCHES ZENTRUM FüR LUFT-UND RAUMFAHRT E.V. | High-performance concrete comprising aerogel pellets |
| CN109721312A (en) * | 2019-03-13 | 2019-05-07 | 北京新时代寰宇科技发展有限公司 | A kind of A grades of non-ignitable aeroge polyphenylene heat insulation slab and preparation method thereof |
| CN114656215A (en) * | 2022-04-02 | 2022-06-24 | 山西阳中新材有限责任公司 | Aerogel inorganic composite A-grade polyphenyl non-combustible heat preservation plate and preparation method thereof |
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