CN109694228B - Gypsum-based self-leveling mortar, preparation method thereof and gypsum-based self-leveling slurry - Google Patents

Gypsum-based self-leveling mortar, preparation method thereof and gypsum-based self-leveling slurry Download PDF

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CN109694228B
CN109694228B CN201710995920.5A CN201710995920A CN109694228B CN 109694228 B CN109694228 B CN 109694228B CN 201710995920 A CN201710995920 A CN 201710995920A CN 109694228 B CN109694228 B CN 109694228B
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gypsum
aerogel
self
sio
leveling mortar
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CN109694228A (en
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王丽
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Beijing New Building Material Group Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions 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 calcium sulfate cements
    • C04B28/145Calcium sulfate hemi-hydrate with a specific crystal form
    • C04B28/147Calcium sulfate hemi-hydrate with a specific crystal form beta-hemihydrate
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02Granular materials, e.g. microballoons
    • C04B14/04Silica-rich materials; Silicates
    • C04B14/06Quartz; Sand
    • C04B14/064Silica aerogel
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use 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
    • C04B20/02Treatment
    • C04B20/023Chemical treatment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions 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 calcium sulfate cements
    • C04B28/142Compositions 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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • C04B28/144Compositions 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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/10Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20Mortars, concrete or artificial stone characterised by specific physical values for the density
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/30Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32Mortars, 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
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

Gypsum-based self-leveling mortar and preparation method thereof, wherein the gypsum-based self-leveling mortar comprises SiO2Aerogel, portland cement, desulfurized gypsum, retarder, water reducing agent, latex powder, stabilizer and filler, and the SiO is prepared by the following method2Aerogel: preparing the silane coupling agent into a silane coupling agent solution by using water; subjecting the hydrophobic SiO2Adding aerogel into the silane coupling agent solution, and stirring until the hydrophobic SiO is obtained2The aerogel is completely dissolved in the silane coupling agent solution; the preparation method of the gypsum-based self-leveling mortar comprises the following steps: surface modification of hydrophobic SiO with silane coupling agent2An aerogel; modifying the SiO2Mixing aerogel and portland cement, and ball milling; adding other components, and mixing. The application also provides gypsum-based self-leveling slurry prepared by using the gypsum-based self-leveling mortar. The gypsum-based self-leveling mortar and slurry have good heat preservation, heat insulation and sound insulation performances.

Description

Gypsum-based self-leveling mortar, preparation method thereof and gypsum-based self-leveling slurry
Technical Field
The application relates to but is not limited to the technical field of novel building materials, in particular to but not limited to gypsum-based self-leveling mortar and a preparation method thereof, and gypsum-based self-leveling slurry.
Background
The desulfurized gypsum is industrial waste residue generated after flue gas desulfurization of power plants, the annual emission amount of the desulfurized gypsum reaches more than 7000 ten thousand tons at present, and about 40 percent of the desulfurized gypsum is stored as waste. According to the forecast of energy planning in China, the emission of desulfurized gypsum reaches about one hundred million tons in 2020 (coal for power generation reaches 20 hundred million tons). The comprehensive utilization of the industrial byproduct gypsum can reduce the exploitation of gypsum mine resources and has great significance for protecting the ecological environment. After analyzing the market prospect of the Chinese self-leveling gypsum, relevant scholars indicate that the development of self-leveling terrace mortar with excellent performance by utilizing desulfurized gypsum waste residue is a feast which is about to be available for the last time in the gypsum industry. In addition, the preparation of the self-leveling terrace mortar by using the desulfurized gypsum provides a new technical approach for the high-added-value comprehensive utilization of the desulfurized gypsum in the power plant, realizes the cyclic utilization of the desulfurized gypsum solid waste in the power plant, saves a large amount of gypsum mineral resources, has obvious energy-saving and emission-reducing benefits and has wide popularization and application prospects.
The temperature of the air in the building room is one of the important factors influencing the comfort of the living environment, and is always the focus of research. SiO 22The aerogel is a solid material with a three-dimensional space network structure, has the characteristics of low density, low thermal conductivity, high light transmittance, high porosity, high specific surface area and the like, has excellent performances of fire prevention, water prevention and the like, is an inexhaustible light, environment-friendly and multifunctional material, and has wide application prospect in the field of building heat preservation and insulation. Mixing SiO2There are few research reports of applying aerogel to mortar, and Kim S2Aerogel powder was added to the cement slurry and was found when SiO was added2When the mass of the aerogel powder accounts for 2 percent of the total mass, the thermal conductivity coefficient is reduced by 75 percent.
As with temperature, air humidity is also one of the important parameters that affect the comfort of an indoor environment. At present, temperature and humidity control materials have been reported at home and abroad, for example, the Chinese patent CN101108902A "high-efficiency humidity control material" discloses a high-efficiency humidity control material, which is prepared from a biological catalyst, a mesoporous material and a super absorbent resin raw material; chinese patent CN101928438A, a preparation method of a nanopore composite humidity controlling material, discloses a nanopore composite humidity controlling material prepared by using organic high polymer, natural high polymer and inorganic porous material as raw materials; chinese patent CN102965998A preparation method of a tough humidity-controlling material discloses a tough humidity-controlling material prepared from sodium carboxymethylcellulose, potassium carbonate, sodium acrylate and diatomite as raw materials. The humidity control materials mostly use organic polymers as raw materials, so that the production cost is high, the reversibility of moisture absorption and desorption is poor, the large-scale popularization of the humidity control materials is limited, meanwhile, a single humidity control component is used as the raw material, the control on temperature is omitted, the function is single, the requirement of a user on the comfort level cannot be met in the using process, and the energy consumption of a building is increased. Chinese patent application CN102557507A "a method for preparing humidity-controlling material by using loess or sepiolite" discloses a humidity-controlling material, which uses loess and slaked lime as humidity-controlling material or uses sepiolite and slaked lime as humidity-controlling material, and the preparation process comprises raw material matching, molding and hydrothermal synthesis strip treatment. Chinese patent CN102417339A & lt & ltGypsum based composite humidity control material & gt and preparation method thereof & gt discloses a humidity control material with gypsum as a cementing material and sepiolite and polyacrylic acid-acrylamide as humidity control components.
At present, SiO is not utilized yet2Research reports on the preparation of the gypsum-based self-leveling terrace mortar capable of controlling temperature and humidity by doping aerogel powder into a gypsum-based material.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The application provides a method for preparing a composite material by using desulfurized gypsum and SiO2The gypsum-based self-leveling mortar prepared from the aerogel has excellent heat insulation performance and can adjust indoor humidity, and the application also provides a method for preparing the gypsum-based self-leveling mortar and slurry comprising the gypsum-based self-leveling mortar.
Specifically, the present application provides a gypsum-based self-leveling mortar.
The gypsum-based self-leveling mortar comprises aerogel, wherein the surface of the aerogel contains hydrophilic groups and is obtained by modifying the surface of hydrophobic aerogel.
By using hydrophobic SiO2SiO obtained by modifying aerogel2Compared with the method of directly adopting hydrophilic SiO for aerogel2The gypsum-based self-leveling mortar prepared from the aerogel has a small heat conductivity coefficient.
In some embodiments, the aerogel can be SiO2An aerogel.
In some embodiments, the SiO2The aerogel is made of hydrophobic SiO2The aerogel is obtained by modifying through a silane coupling agent.
In some embodiments, the hydrophobic SiO2The weight ratio of the aerogel to the silane coupling agent is (0.5-1): 1.
In some embodiments, the following may be employedMethod for preparing the SiO2Aerogel: preparing the silane coupling agent into a silane coupling agent solution by using water; subjecting the hydrophobic SiO2Adding aerogel into the silane coupling agent solution, and stirring until the hydrophobic SiO is obtained2The aerogel is completely dissolved in the silane coupling agent solution.
In some embodiments, the gypsum-based self-leveling mortar may further include portland cement, the SiO2The weight ratio of the aerogel to the portland cement is (1-8) to (5-15).
In some embodiments, the SiO2The preparation method of the aerogel may further comprise: SiO obtained by modifying silane coupling agent2And mixing the aerogel with the portland cement and performing ball milling.
In some embodiments, the gypsum-based self-leveling mortar may further include desulfurized gypsum.
In some embodiments, the desulfurized gypsum can be selected from one or both of alpha hemihydrate gypsum and beta hemihydrate gypsum.
Optionally, the desulfurized gypsum consists of alpha hemihydrate gypsum and beta hemihydrate gypsum, wherein the weight ratio of the alpha hemihydrate gypsum to the beta hemihydrate gypsum is (30-50): (50-70).
Optionally, the weight ratio of the alpha hemihydrate gypsum to the beta hemihydrate gypsum is (35-45): (55-65).
In one embodiment, alpha hemihydrate gypsum, beta hemihydrate gypsum, portland cement, SiO2Compounding aerogel and filler, testing the particle size distribution of the powder by using a laser particle size distribution instrument to adjust the particle size distribution of the powder, and performing further comprehensive evaluation and optimal configuration on the particle size distribution of the powder by performing standard consistency water consumption, setting time (initial setting and final setting) and mechanical property test (compressive strength and flexural strength) on the powder. The inventor of this application discovers in practice that when preparing desulfurization gypsum-based self-leveling terrace material with desulfurization gypsum, the particle size of desulfurization gypsum can influence the particle gradation of self-leveling terrace mortar. The particle size of desulfurization gypsum produces certain influence to the performance of desulfurization gypsum base self-leveling terrace material: threshing deviceThe granularity of the sulfur gypsum is too large, so that the hydration process and the setting and hardening process of the gypsum cementing material can be slowed down, and the hardness and the wear resistance of the surface layer of the laid ground are further influenced; the granularity of the desulfurized gypsum is too small, the gypsum cementing material is not easy to disperse when contacting with water, agglomeration can occur in the hydration process, the defect inside a gypsum hardened body is increased after hydration, and the integral strength of the gypsum-based terrace mortar is reduced.
Thus, in some embodiments, the desulfurized gypsum can be 80-100 mesh. The particle size of the desulfurized gypsum is within the range, so that the desulfurized gypsum-based self-leveling terrace material with excellent construction performance, good volume stability and good workability can be obtained.
In some embodiments, the gypsum-based self-leveling mortar may further include a retarder, a water reducer, a latex powder, a stabilizer, and a filler.
In some embodiments, the aerogel may be included in an amount of 1 to 8 parts by weight, the retarder may be included in an amount of 5 to 15 parts by weight, the water reducing agent may be included in an amount of 0.01 to 1 part by weight, the latex powder may be included in an amount of 0 to 4 parts by weight, the stabilizer may be included in an amount of 0.02 to 0.12 part by weight, and the filler may be included in an amount of 45 to 60 parts by weight, with respect to 100 parts by weight of the desulfurized gypsum.
When the silicate cement and the aerogel with the modified surface are added for grinding, the silicate cement can also be used as a retarder, so that the using amount of the retarder in the gypsum-based self-leveling mortar can be properly reduced, and the using amount of the retarder is determined by ensuring the proper retarding time of the gypsum-based self-leveling mortar. Specifically, the retarder may be used in an amount of 5 to 15 parts by weight, relative to 100 parts by weight of the desulfurized gypsum.
Optionally, relative to 100 parts by weight of desulfurized gypsum, the aerogel content is 2-7 parts by weight, the retarder content is 5-15 parts by weight, the water reducing agent content is 0.05-0.8 parts by weight, the latex powder content is 1-3 parts by weight, the stabilizer content is 0.05-0.1 parts by weight, and the filler content is 45-55 parts by weight.
In some embodiments, the set retarder may be selected from one or more of portland cement, citric acid, and organic high-efficiency composite set retarders.
Optionally, the retarder is an organic high performance composite retarder, such as the high performance gypsum-based retarder Retardan P manufactured by TRICOSAL, Germany, or an organic retarder, such as HyCon R7200F manufactured by Pasteur.
In some embodiments, the water reducing agent may be selected from one or more of a melamine resin-based water reducing agent and a polycarboxylic acid-based water reducing agent.
Optionally, the water reducer is a polycarboxylic acid water reducer, such as Melflux5691F, 5581F water reducer, and the like, manufactured by basf corporation.
In some embodiments, the latex powder may be a redispersible latex powder, such as those manufactured by wacker, fortita corporation.
In some embodiments, the stabilizer may be an anionic polymer viscosity modifier, such as Starvis3070F, an anionic polymer viscosity modifier manufactured by BASF corporation.
In some embodiments, the filler may be selected from fly ash, quartz sand, nano-sized SiO2One or more of aerogel, silica fume, and river sand.
Optionally, the fly ash is class II fly ash with the particle size of 300-450 meshes.
Optionally, the quartz sand has a particle size of 70-90 mesh.
The application provides a functional pre-mixed self-leveling mortar produced by utilizing desulfurized gypsum waste residues, and the mortar has the excellent characteristics of good fluidity, quick condensation, high strength, small shrinkage, good alkali resistance, environmental friendliness, no pollution, low-temperature drying resistance and the like, and opens up a new way for resource utilization of the desulfurized gypsum waste residues.
The main material of the gypsum-based self-leveling mortar is desulfurized gypsum, and is completely different from a gypsum-cement mixed system (the using amount of cement is large) of the traditional self-leveling terrace material.
Simultaneously, this application has creatively added the aerogel in gypsum base self-leveling mortar, has improved the thermal insulation performance of gypsum base self-leveling mortar by a wide margin, has improved the comfort level of indoor human environment again when effective energy saving. In addition, the aerogel that this application adopted has the effect of filler concurrently, has improved the particle gradation of gypsum base self-leveling mortar, has reduced the bulk density of mortar.
When the aerogel is an aerogel containing hydrophilic groups on the surface and obtained by modifying the surface of hydrophobic aerogel, in particular hydrophobic SiO2Modifying aerogel by silane coupling agent and grinding and modifying aerogel and silicate cement together to obtain SiO2When the aerogel is used, the compatibility between the aerogel and other components of the mortar is better. While not wishing to be bound by theory, the inventors of the present application speculate that the reason may be: the silane coupling agent can promote the interface fusion between the inorganic cementing material (such as desulfurized gypsum) and the aerogel, and the grinding can increase the content of the silane coupling agent and SiO2Hydrophobic groups (Si-R, R ═ CH) in aerogel molecules3Or C2H5Etc.), the probability of contact of hydrophilic groups of substances in cement, so that the silane coupling agent is exposed to SiO2The modification effect of the interface of the aerogel and the inorganic cementing material is improved, so that the grinding can greatly improve the SiO content2Compatibility between aerogel and other components of mortar, so that SiO is generated2The aerogel can be smoothly added into the mortar to improve SiO2Utilization rate of aerogel.
The application also provides a method for preparing the gypsum-based self-leveling mortar.
The method for preparing the gypsum-based self-leveling mortar comprises the step of uniformly mixing retarder aerogel, optional portland cement, a water reducing agent, latex powder, a stabilizer, desulfurized gypsum and a filler.
In some embodiments, a method of making a gypsum-based self-leveling mortar as described above may comprise:
preparing a silane coupling agent into a silane coupling agent solution by using water; hydrophobic SiO2Adding aerogel into the silane coupling agent solution, and stirring until the hydrophobic SiO is obtained2Completely dissolving aerogel in the silane coupling agent solution to obtain SiO2An aerogel solution; subjecting the SiO2Mixing the aerogel solution with portland cement, and performing ball milling;
the retarder and the SiO after ball milling are mixed2And uniformly mixing the aerogel, the silicate cement, the water reducing agent, the latex powder, the stabilizer, the desulfurized gypsum and the filler to obtain the cement.
The application also provides gypsum-based self-leveling slurry.
The gypsum-based self-leveling slurry provided by the application comprises the gypsum-based self-leveling mortar and water, wherein the water and the total amount of the water in the gypsum-based self-leveling mortar are the standard consistency water consumption of the gypsum-based self-leveling mortar.
Compare with current self-leveling terrace mortar, the gypsum base self-leveling mortar of this application or the gypsum base self-leveling slurry of preparing by its watering have following advantage:
(1) the gypsum with small drying shrinkage or hardening shrinkage is changed into calcium sulfate dihydrate from calcium sulfate hemihydrate in the hydration process, and the volume of the gypsum is slightly expanded, so that part of drying shrinkage and hardening shrinkage can be compensated;
(2) the heat preservation, heat insulation and sound insulation performance is good, and the building energy conservation is facilitated;
(3) the environment is protected and no pollution is caused;
(4) has fine adjustment effect on the indoor air humidity and has good breathing performance: gypsum is a porous material containing crystal water, which releases some structural water when the humidity in the air is too low, and water in the air enters the gypsum pores when the humidity in the air is too high;
(5) the temperature control device has the temperature control function, can effectively reduce the fluctuation range of indoor temperature, and improves the comfort of human living environment.
In addition, the gypsum-based self-leveling mortar of the present application or the gypsum-based self-leveling slurry prepared therefrom by adding water also has the following additional advantages:
1. various additives in the gypsum-based self-leveling mortar have good compatibility and are easy to adjust and control;
2. the gypsum-based self-leveling mortar is functional self-leveling terrace mortar, and SiO in the mortar2The aerogel is a porous heat-insulating material, improves the heat-insulating property of the mortar, reduces the volume density of the mortar, and can adsorb harmful substances such as formaldehyde in the air.
3. The application can effectively treat the desulfurized gypsum waste residue, realize the resource utilization of the desulfurized gypsum and simultaneously reduce the production cost of the mortar.
4. When the formula of the gypsum-based self-leveling mortar contains the Portland cement, the Portland cement plays a role of a retarder before the mortar is formed, can replace part of organic retarder, and improves the overall strength and the surface hardness of the material after the mortar prepared slurry is laid.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
Fig. 1 is an apparent morphology diagram of the gypsum-based self-leveling mortar of example 1 of the present application.
Fig. 2 is an apparent morphology diagram of the gypsum-based self-leveling mortar of comparative example 1 of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The raw materials and reagents used in the following examples are all common commercial products unless otherwise specified.
Example 1
Step 1: (1) preparing 2kg of silane coupling agent (type KH550, common commercial product) into a silane coupling agent solution with the mass fraction of 10% by using water; (2) 2kg of hydrophobic SiO2Aerogel (available from Shaoxino technologies, Inc., Zhejiang, with a pore size of about 18nm) was added to the formulated silane coupling agent solution, which was mixed in a particle blender until the hydrophobic SiO was present2Completely dissolving aerogel in a silane coupling agent solution; (3) the obtained SiO2The aerogel solution and 14kg of portland cement are placed in a ball mill for ball milling for 4min for later use.
Step 2: uniformly mixing 45kg of 70-90 mesh fine river sand and 100kg of desulfurized gypsum (wherein, the alpha hemihydrate gypsum is 50kg, and the beta hemihydrate gypsum is 50kg) in a stirrer;
and step 3: fully mixing the powder obtained in the step 2 with 0.04kg of HyCon R7200F organic retarder, 0.2kg of Melflux5691F water reducing agent, 2kg of redispersible latex powder RE5010N (purchased from Yilite company) and 0.05kg of Starvis3070F stabilizer to obtain premixed powder;
and 4, step 4: mixing the premixed powder obtained in the step 3 with the modified SiO prepared in the step 12Mixing the aerogel and the portland cement to prepare gypsum-based self-leveling mortar;
and 5: and (3) mixing the gypsum-based self-leveling mortar with a proper amount of mixing water (the total amount of the mixing water and 18kg of water for preparing the silane coupling agent solution is the water consumption of the standard consistency of the gypsum-based self-leveling mortar) to prepare the gypsum-based self-leveling slurry.
Example 2
Step 1: (1) preparing a silane coupling agent (type KH550, a common commercial product) into a silane coupling agent solution with the mass fraction of 10% by using water; (2) 3kg of hydrophobic SiO2Aerogels (available from Shanghai Ming New Material technology Limited, type TSP60 SiO)2Hydrophobic, particle size of 60-80 mesh and void diameter of 20-50 nm) is added into the prepared silane coupling agent solution, and the solution is placed into a particle stirrer to be mixed until the hydrophobic SiO is2The aerogel is completely dissolved inSilane coupling agent solution; (3) the obtained SiO2The aerogel solution and 10kg of portland cement are put into a ball mill for ball milling for 4min for later use.
Step 2: putting 55kg of fine river sand of 70-90 meshes and 100kg of desulfurized gypsum (wherein, the alpha hemihydrate gypsum is 40kg, and the beta hemihydrate gypsum is 60kg) into a stirrer for uniform mixing;
and step 3: fully mixing the powder obtained in the step 2 with 0.04kg of HyCon R7200F organic retarder, 0.1kg of Melflux5581F water reducer, 1kg of redispersible latex powder RE5010N (purchased from Yilite company) and 0.05kg of Starvis3070F stabilizer to obtain premixed powder;
and 4, step 4: mixing the premixed powder obtained in the step 3 with the modified SiO prepared in the step 12Mixing the aerogel and the portland cement to prepare gypsum-based self-leveling mortar;
and 5: and (3) mixing the gypsum-based self-leveling mortar with a proper amount of mixing water (the total amount of the mixing water and 18kg of water for preparing the silane coupling agent solution is the water consumption of the standard consistency of the gypsum-based self-leveling mortar) to prepare the gypsum-based self-leveling slurry.
Example 3
This embodiment differs from embodiment 1 only in that:
SiO23kg of aerogel; 50kg of fine river sand; the retarder is a high-efficiency gypsum-based retarder Retardan P, and the mixing amount is 0.03 kg; 3kg of latex powder and 0.07kg of stabilizing agent.
Comparative example 1
This comparative example differs from example 1 only in that:
directly using hydrophobic SiO2Aerogel, not modified by silane coupling agent and ground.
Fig. 1 is an apparent morphology diagram of the gypsum-based self-leveling mortar of example 1 of the present application; fig. 2 is an apparent morphology diagram of the gypsum-based self-leveling mortar of comparative example 1 of the present application. As can be seen by comparing FIGS. 1-2, the hydrophobic SiO of example 12After the aerogel is modified by the silane coupling agent and ground, the aerogel is easy to dissolve in water and has good compatibility with other components in the mortar; while the hydrophobic SiO of comparative example 12The aerogel is not modified, has obvious hydrophobicity and is notDissolved in water, using such hydrophobic SiO2Self-leveling mortar prepared from aerogel cannot be constructed.
Comparative example 2
This comparative example differs from example 1 only in that:
no aerogel was added.
Test example
The performance of the gypsum-based self-leveling mortars prepared in the above examples and comparative examples was tested according to the industry standard gypsum-based self-leveling mortar (JC/T1023-2007), and the test results are reported in Table 1.
TABLE 1
Test items Standard of merit Example 1 Example 2 Example 3 Comparative example 2 Cement-based mortar
Fluidity, mm 145 150 145 151 149 152
Initial setting time, h ≥1 1.2 1.5 2 0.8 3.5
Final setting time, h ≤6 5.5 6 5 5 23
Flexural strength of 24 hours, MPa ≥2.5 2.9 2.5 3.5 3.1 -
24 compressive strength, MPa ≥6 6.5 6.1 7.1 6.7 -
Absolute dry breaking strength, MPa ≥7.5 8 7.7 8.5 8.1 8.7
Absolute dry compressive strength, MPa ≥20 25 21 26 26 28
Absolute tensile viscosity, MPa ≥1 1 1 1.2 1.1 0.9
Shrinkage ratio% ≤0.05 0.04 0.045 0.039 0.039 0.05
Thermal conductivity w/m.K (25 ℃ C.) 0.05 0.07 0.035 0.11 0.42
Bulk density kg/m3 1154 1217 1005 1430 1874
As can be seen from Table 1, in the examples 1 to 3 of the present application, a proper amount of modified SiO is added to the floor mortar material2The influence on the mechanical property of a hardened body after the aerogel is little and can be almost ignored, but the heat conductivity coefficient is greatly reduced, and the heat preservation effect is obvious. Meanwhile, the density of the mortar is greatly reduced.
In addition, the gypsum-based self-leveling slurry provided by the embodiments 1 to 3 is superior to cement-based self-leveling floor mortar in the aspects of heat conductivity, absolute dry tensile viscosity, shrinkage rate and the like; the bulk density is also greatly reduced.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims (14)

1. The gypsum-based self-leveling mortar comprises desulfurized gypsum and SiO2Aerogel and portland cement, the SiO being present relative to 100 parts by weight of desulfurized gypsum21-8 parts of aerogel, and the SiO2The aerogel surface contains hydrophilic groups and is made of hydrophobic SiO2Modifying the aerogel by using a silane coupling agent to obtain the aerogel;
the SiO2The preparation method of the aerogel comprises the following steps: preparing the silane coupling agent into a silane coupling agent solution by using water; subjecting the hydrophobic SiO2Adding aerogel into the silane coupling agent solution, and stirring until the hydrophobic SiO is obtained2Completely dissolving aerogel in the silane coupling agent solution to obtain SiO2An aerogel solution; subjecting the SiO2Mixing the aerogel solution with the portland cement, and performing ball milling; wherein the hydrophobic SiO2The weight ratio of the aerogel to the silane coupling agent is (0.5-1): 1; the SiO2The weight ratio of the aerogel to the portland cement is (1-8) to (5-15).
2. The gypsum-based self-leveling mortar of claim 1, wherein the desulfurized gypsum has a particle size of 80-100 mesh.
3. The gypsum-based self-leveling mortar of claim 2, wherein the desulfurized gypsum is selected from one or both of alpha hemihydrate gypsum and beta hemihydrate gypsum.
4. The gypsum-based self-leveling mortar of claim 3, wherein the desulfurized gypsum consists of alpha hemihydrate gypsum and beta hemihydrate gypsum in a weight ratio of (30-50) to (50-70).
5. The gypsum-based self-leveling mortar of claim 4, wherein the weight ratio of the alpha hemihydrate gypsum to the beta hemihydrate gypsum is (35-45): (55-65).
6. The gypsum-based self-leveling mortar of claim 1, further comprising a retarder, a water reducer, latex powder, a stabilizer and a filler, wherein the retarder is 5-15 parts by weight, the water reducer is 0.01-1 part by weight, the latex powder is 0-4 parts by weight, the stabilizer is 0.02-0.12 part by weight, and the filler is 45-60 parts by weight, based on 100 parts by weight of desulfurized gypsum.
7. The gypsum-based self-leveling mortar of claim 6, wherein the SiO is relative to 100 parts by weight of desulfurized gypsum22-7 parts of aerogel, 5-15 parts of retarder, 0.05-0.8 part of water reducing agent, 1-3 parts of latex powder, 0.05-0.1 part of stabilizer and 45-55 parts of filler.
8. The gypsum-based self-leveling mortar of claim 6 or 7, wherein the set retarder is selected from one or more of portland cement, citric acid, organic set retarders, and organic high efficiency composite set retarders.
9. The gypsum-based self-leveling mortar of claim 6 or 7, wherein the water reducer is selected from one or more of a melamine resin-based water reducer and a polycarboxylic acid-based water reducer.
10. The gypsum-based self-leveling mortar of claim 6 or 7, wherein the latex powder is a redispersible latex powder.
11. The gypsum-based self-leveling mortar of claim 6 or 7, wherein the stabilizer is an anionic polymer viscosity modifier.
12. The gypsum-based self-leveling mortar of claim 6 or 7, wherein the filler is selected from fly ash, quartz sand, nano-sized SiO2One or more of aerogel, silica fume, and river sand.
13. A method of making the gypsum-based self-leveling mortar of any one of claims 6-12, the method comprising:
preparing a silane coupling agent into a silane coupling agent solution by using water; hydrophobic SiO2Adding aerogel into the silane coupling agent solution, and stirring until the hydrophobic S is obtainediO2Completely dissolving aerogel in the silane coupling agent solution to obtain SiO2An aerogel solution; subjecting the SiO2Mixing the aerogel solution with portland cement, and performing ball milling;
the retarder and the SiO after ball milling are mixed2And uniformly mixing the aerogel, the silicate cement, the water reducing agent, the latex powder, the stabilizer, the desulfurized gypsum and the filler to obtain the cement.
14. A gypsum-based self-leveling slurry comprising the gypsum-based self-leveling mortar of any one of claims 1-12 and water, wherein the total amount of water and water in the gypsum-based self-leveling mortar is the amount of water used for the standard consistency of the gypsum-based self-leveling mortar.
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