CN113979716B - Preparation method of magnesium oxysulfate cementing material adopting silicon dioxide aerogel and building component - Google Patents
Preparation method of magnesium oxysulfate cementing material adopting silicon dioxide aerogel and building component Download PDFInfo
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- CN113979716B CN113979716B CN202111593559.6A CN202111593559A CN113979716B CN 113979716 B CN113979716 B CN 113979716B CN 202111593559 A CN202111593559 A CN 202111593559A CN 113979716 B CN113979716 B CN 113979716B
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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
- C04B28/30—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing magnesium cements or similar cements
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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
- C04B14/00—Use 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
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/064—Silica aerogel
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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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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention provides a magnesium oxysulfate cementing material adopting silicon dioxide aerogel, a preparation method and a building member. The magnesium oxysulfate gel material adopting the silicon dioxide aerogel comprises a component A and a component B, wherein: the component A comprises 1 part of magnesium sulfate heptahydrate, 8-12 parts of light-burned magnesium oxide and 15-22 parts of water according to a molar ratio, and the content of active magnesium oxide in the light-burned magnesium oxide is 55-65%; the component B comprises a modifier and aerogel; the modifier is one of citric acid, tartaric acid and sodium malate, or a mixture of the citric acid and the tartaric acid, the citric acid accounts for 0.7-0.8% of the weight of the light-burned magnesia, and the tartaric acid and the sodium malate account for 1.3-1.8% of the weight of the light-burned magnesia; the aerogel is less than 6 percent of the weight of the light-burned magnesia. The magnesium oxysulfate gel material adopting the silicon dioxide aerogel is beneficial to improving the mechanical property and the heat preservation property of a magnesium oxysulfate gel building material.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of a magnesium oxysulfate cementing material adopting silicon dioxide aerogel. The invention also relates to a building component.
Background
The magnesium oxysulfate cementing material is used as a novel building material, is mainly prepared by mixing light-burned magnesium oxide and a heptahydrate magnesium sulfate solution, has the properties of light weight, good volume stability, high breaking strength, fire resistance, heat preservation, heat insulation and the like, and is more and more widely applied. The difference of various components can have great influence on the performance of the magnesium oxysulfate cementing material; when the magnesium oxysulfate cementing material is prepared, the physical properties of the magnesium oxysulfate cementing material obtained by the method are changed due to different molar specific gravities of the raw materials and different amounts of the added chemical reagents, so that the magnesium oxysulfate cementing material prepared by the conventional preparation method has high heat conductivity coefficient, and low physical properties such as fracture resistance, compression resistance, softening coefficient and the like.
Aerogel is a solid form, the least dense solid in the world. There are many kinds of aerogels, including silicon-based, carbon-based, sulfur-based, metal oxide-based, or metal-based ones, and silicon aerogels are generally used. Because the fine nano network structure of the silicon aerogel effectively limits the propagation of local thermal excitation, the solid thermal conductivity of the silicon aerogel is 2 to 3 orders of magnitude lower than that of a corresponding glassy material, and the silicon aerogel is a solid material with the lowest thermal conductivity and is expected to become a novel heat insulation material. The aerogel material is a novel nano material, has a porous network framework structure and a large specific surface area, has extremely low internal density due to the fact that more than 90% of the volume of the material is air, and further has an extremely low heat conductivity coefficient, and the aerogel material has the advantages of being green, energy-saving and light in weight when being used as a building engineering material.
Along with the rapid development of economy in China, the demand on building materials is more and more vigorous, and as the traditional building materials are seriously polluted and have high energy consumption, the novel building materials are more strongly demanded according to the requirements of resource conservation and environmental friendliness. The magnesium cementing material is known as '21 st century green engineering building material', and is used as a novel green composite material with good heat preservation effect.
However, in the existing preparation of magnesium oxysulfate cementing materials, methods for adding aerogels and related researches are lacked; the defects of heat insulation and heat preservation of the existing magnesium oxysulfate cementing material exist, and meanwhile, the mechanical property of the material is easily weakened by directly adding aerogel into the magnesium oxysulfate cementing material, so that the adding process of aerogel and related modifiers in the magnesium oxysulfate cementing material needs to be deeply researched.
Disclosure of Invention
In view of the above, the present invention is directed to a method for preparing a magnesium oxysulfate binding material using silica aerogel, so as to improve the mechanical properties and the thermal insulation properties of the magnesium oxysulfate binding building material.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a magnesium oxysulfate cementing material adopting silica aerogel comprises a component A and a component B, wherein:
the component A comprises 1 part of magnesium sulfate heptahydrate, 8-12 parts of light burned magnesium oxide and 15-22 parts of water according to the mol ratio, and the content of active magnesium oxide in the light burned magnesium oxide is 55% -65%;
the component B comprises a modifier and aerogel; the modifier is one of citric acid, tartaric acid and sodium malate or a mixture of citric acid and tartaric acid, the citric acid accounts for 0.7-0.8% of the weight of the light-burned magnesium oxide, and the tartaric acid and the sodium malate account for 1.3-1.8% of the weight of the light-burned magnesium oxide; the aerogel is less than 6% of the weight of the light-burned magnesia.
Further, the aerogel adopts silicon dioxide aerogel.
Further, the content of the citric acid is 0.75 percent of the weight of the light calcined magnesia, and the content of the tartaric acid and the content of the sodium malate are both 1.5 percent of the weight of the light calcined magnesia.
Further, the content of the active magnesium oxide in the light-burned magnesium oxide is 57.8%.
Compared with the prior art, the invention has the following advantages:
the material researched by the invention takes the magnesium oxysulfate cementing material as a main raw material, then the silicon dioxide aerogel is added to form the magnesium oxysulfate composite cementing material, and different modifiers are respectively added to change the performance of the magnesium oxysulfate composite cementing material.
In addition, the heat preservation performance of the magnesium oxysulfate cementing material can be improved by doping the silicon dioxide aerogel; the silica aerogel is doped, can realize the promotion to magnesium oxysulfate binding material thermal insulation performance, simultaneously, through setting up reasonable quantitative silica aerogel's doping amount, make combined material's flexural strength, compressive strength and water resistance can keep magnesium oxysulfate binding material's performance to a certain extent, therefore can provide fine basis for the promotion of magnesium oxysulfate material thermal insulation performance.
Another object of the present invention is to propose a preparation method for the preparation of magnesium oxysulfate gelling material using silica aerogel according to the present invention, comprising the steps of:
s1. preparing magnesium sulfate heptahydrate solution from magnesium sulfate heptahydrate and water according to the proportion, pouring modifier and aerogel into the magnesium sulfate heptahydrate solution, and stirring thoroughly to generate mixed solution;
s2, adding light calcined magnesia with a proportioning requirement into the mixed solution, and fully stirring to form slurry with uniform viscosity;
s3., injecting the slurry into a mold coated with a release agent, removing bubbles in the slurry, curing and reacting for 22-26 hours at the temperature of 20-30 ℃ and the humidity of 60-70%, and then demolding to obtain a semi-finished product;
s4. curing the semi-finished product in an environment with the temperature of 20-30 ℃ and the humidity of 60-70% for 7 days to obtain the finished product.
Further, the mold is a cast iron mold, and the release agent is paraffin or engine oil.
Further, in step s3, bubbles in the slurry are removed by vibration, and the surface of the slurry in the mold is scraped and rolled.
Further, in step s3, the ambient temperature of the curing reaction is 25 ℃, the humidity is 65%, and the reaction time is 24 hours; in step s5, the ambient temperature for curing was 25 ℃ and the humidity was 65%.
Further, the light-burned magnesia adopts light-burned magnesia powder.
Compared with the prior art, the invention has the following advantages:
the preparation method is convenient for operation and implementation in construction, and the magnesium oxysulfate cementing material with excellent mechanical property and thermal insulation property can be generated. The prepared magnesium oxysulfate cementing material is used for partition walls or plug-in type buildings, the heat preservation performance of the magnesium oxysulfate cementing material can be improved, and the characteristics of high mechanical strength, good water resistance, long service life and the like of the magnesium oxysulfate cementing material can be fully utilized; thereby improving the performance of wall heat preservation and construction, and having good economic and social significance.
In addition, the invention also provides a building component, which adopts the magnesium oxysulfate gel material adopting the silicon dioxide aerogel and is prepared by the preparation method. The building member of the present invention has the technical advantages of the magnesium oxysulfate gel material of the silica aerogel.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention, and the description is given by way of example only and without limitation to the terms of relative positions. In the drawings:
FIG. 1 is a flow chart illustrating the preparation of a magnesium oxysulfate aerogel containing silica aerogel according to example II of the present invention;
FIG. 2 is an electron microscope scanning image of citric acid modified magnesium oxysulfate gelling material according to example two of the present invention;
FIG. 3 is an electron microscope scanning image of tartaric acid modified magnesium oxysulfate binding material according to example two of the present invention;
FIG. 4 is an electron microscope scanning image of a magnesium oxysulfate gelled composite of a silica aerogel according to example two of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
The embodiment relates to a magnesium oxysulfate gel material adopting silica aerogel, which is beneficial to improving the mechanical property and the thermal insulation property of a magnesium oxysulfate gel building material. The magnesium oxysulfate gel adopting the silicon dioxide aerogel comprises a component A and a component B, wherein:
the component A comprises 1 part of magnesium sulfate heptahydrate, 8-12 parts of light-burned magnesium oxide and 15-22 parts of water according to a molar ratio; and the content of active magnesium oxide in the light-burned magnesium oxide is 55-65%.
The component B comprises a modifier and aerogel. Wherein the modifier is one of citric acid, tartaric acid and sodium malate, or a mixture of citric acid and tartaric acid; the dosage of each modifier is as follows: the citric acid accounts for 0.7-0.8% of the weight of the light-burned magnesium oxide, and the tartaric acid and the sodium malate account for 1.3-1.8% of the weight of the light-burned magnesium oxide. The amount of the aerogel is less than 6 percent of the weight of the light-burned magnesia.
Based on the overall proportioning principle, the aerogel preferably adopts silicon dioxide aerogel. The preferred amounts of each modifier are: the content of citric acid is 0.75% of the weight of the light burned magnesium oxide, and the content of tartaric acid and sodium malate are both 1.5% of the weight of the light burned magnesium oxide. Meanwhile, the content of active magnesium oxide in the light-burned magnesium oxide is preferably about 57.8%.
In the preparation of the aerogel magnesium oxysulfate gel material, the silicon dioxide aerogel can be obtained from aerogel manufacturers. The aerogel has the advantages of low thermal conductivity coefficient, good thermal insulation performance, low density, light material and energy consumption saving.
Preferably, in the preparation components of the magnesium oxysulfate cementing material, the light-burned magnesium oxide in the embodiment is a commercial product with the purity of 80-85%, the activity of 55-65% and the fineness of 200 meshes; for example, a 200-mesh commercial light-burned magnesium oxide product having a purity of 83% and an activity of 60% is used. In the preparation of the magnesium sulfate heptahydrate solution using magnesium sulfate heptahydrate and water of this example, magnesium sulfate heptahydrate having a purity of 95% to 99% is preferably used.
When the magnesium oxysulfate gel is prepared, the modifier is selected from one of tartaric acid, citric acid and sodium malate, or a mixture of the two modifiers of tartaric acid and citric acid. Meanwhile, as a preferable composition example of the modifier of the embodiment, in the modifier, the content of citric acid is 0.75% by mass of the light-burned magnesia powder, the content of tartaric acid is 1.5% by mass of the light-burned magnesia powder, and the content of sodium malate is 1.5% by mass of the light-burned magnesia powder. When the modifier is specifically prepared, tartaric acid, citric acid, sodium malate and a mixture of citric acid and tartaric acid are respectively and fully mixed with a magnesium sulfate heptahydrate solution in a stirring and mixing mode.
In the present embodiment, the content of the silica aerogel is 6% or less by mass of the light-burned magnesia powder, and may be, for example, 1%, 2%, 4%, 6%. When the aerogel is specifically prepared, the silicon dioxide aerogel is fully and uniformly mixed with the modifier and the magnesium sulfate heptahydrate solution by stirring and mixing.
It should be noted that, the specific contents of the above components in the magnesium oxysulfate cementing material of the embodiment may be adaptively selected in practical applications, and the specific contents may meet the requirements of the whole weight ratio.
The magnesium oxysulfate binding material of silica aerogel of this embodiment uses magnesium oxysulfate binding material as main raw materials, later adds silica aerogel in order to form magnesium oxysulfate composite binding material, adds different modifiers respectively simultaneously and carries out the performance change, and this composite material can possess performance characteristics such as light, adiabatic heat preservation and low heat conduction efficiency under invariable temperature, humidity condition. The silica aerogel is doped, can realize the promotion to magnesium oxysulfate binding material thermal insulation performance, simultaneously, through setting up reasonable quantitative silica aerogel's doping amount, make combined material's flexural strength, compressive strength and water resistance can keep magnesium oxysulfate binding material's performance to a certain extent, therefore can provide fine basis for the promotion of magnesium oxysulfate material thermal insulation performance.
Example two
The embodiment relates to a preparation method of a magnesium oxysulfate cementing material adopting silica aerogel and a building component, which are convenient for operation and implementation in construction and can generate the magnesium oxysulfate cementing material with excellent mechanical property and thermal insulation property.
The method is used for preparing the magnesium oxysulfate cementing material adopting the silica aerogel provided by the first embodiment and comprises the following steps of:
s1. preparing magnesium sulfate heptahydrate solution from magnesium sulfate heptahydrate and water, pouring modifier and aerogel into the magnesium sulfate heptahydrate solution, and stirring to obtain mixed solution;
s2, adding the light calcined magnesia with the proportioning requirement into the mixed solution, and fully stirring to form slurry with uniform viscosity;
s3. injecting the slurry into a mold coated with a release agent, removing bubbles in the slurry, curing and reacting for 22-26 hours in an environment with the temperature of 20-30 ℃ and the humidity of 60-70%, and then releasing the mold to obtain a semi-finished product;
s4. curing the semi-finished product in an environment with the temperature of 20-30 ℃ and the humidity of 60-70% for 7 days to obtain the finished product.
Based on the above general preparation flow requirements, the following specific operation can be adopted in the preparation of magnesium oxysulfate gel.
First, a mold is prepared and a layer of mold release agent is applied to the mold. For example, a triad cast iron mold having dimensions of 40mm x 160mm is used; paraffin wax or engine oil can be used as the release agent.
Then, preparing required raw materials of various components; wherein, the light-burned magnesia preferably adopts light-burned magnesia powder; and a magnesium oxide active hydration detection method is adopted to detect the activity of the light-burned magnesium oxide, so that the content of the active magnesium oxide in the light-burned magnesium oxide is ensured to meet the requirement. Respectively weighing active magnesium oxide, magnesium sulfate heptahydrate, citric acid, tartaric acid, sodium malate and aerogel, and weighing water in corresponding proportion.
Thereafter, the dissolution operation is performed. Magnesium sulfate heptahydrate is fully stirred and dissolved in water at room temperature to form a magnesium sulfate solution (namely, the magnesium sulfate heptahydrate solution), a certain modifier is poured into the magnesium sulfate solution to be fully stirred at a slow speed to form a mixed solution, the mechanical property and other properties are measured, then, silicon dioxide aerogel is added to carry out thermal conductivity measurement, and the material is ensured to meet the mechanical and thermal insulation property requirements required by buildings.
According to different types of aerogel and modifier added into the magnesium sulfate solution and different amounts of aerogel added, various types of mixed solutions can be generated. For example, the modifier is citric acid, tartaric acid, sodium malate or a mixture of citric acid and tartaric acid, and the amount of aerogel added can be 1%, 2%, 6% of the weight of the light-burned magnesia powder. In this way, a plurality of different mixed solutions can be formed.
For example, a predetermined amount of light-burned magnesium oxide powder is poured into a mixed solution of a magnesium sulfate solution and various modifiers such as citric acid, tartaric acid, sodium malate, etc., and the mixture is thoroughly stirred at room temperature with a stirrer to form A, B, C kinds of slurries (three kinds of example products in example 1 below, namely, the three kinds of slurries are used). A certain amount of light-burned magnesia powder is respectively poured into the solution of citric acid and the mixture of citric acid and tartaric acid, and respectively added into the mixed solution containing silica aerogel, and the mixture is thoroughly stirred at room temperature by a stirrer to respectively form D, E three slurries (namely, the three slurries are adopted as the products of the two groups of examples in the following example 2). . The slurry needs to be fully stirred until the viscosity is uniform, different slurries have certain difference in mechanical property and thermal insulation property, and can be flexibly adjusted and selected according to the performance requirement of a building framework.
After the preparation of the slurry is finished, injecting the slurry into a mold, and demolding after 24 hours of curing and molding to obtain a semi-finished product; then putting the mixture into a constant-temperature and constant-humidity curing box for curing for 7 days and 28 days respectively to obtain a finished product. When the mould is placed on the building frame, the finished product forms the building element of the building.
It should be noted that, after the injection molding, the slurry should be subjected to a process of removing bubbles from the slurry by vibration or the like, and then the surface of the slurry in the mold should be scraped and rolled.
Meanwhile, the ambient temperature of the curing reaction is preferably 25 ℃, the humidity is 65%, and the reaction time is 24 hours; in step s5, the ambient temperature for curing was 25 ℃ and the humidity was 65%.
By the preparation method, the magnesium oxysulfate gel with good mechanical property and heat preservation property can be obtained. The preparation method is convenient for operation and implementation in construction, and can generate the magnesium oxysulfate cementing material with excellent mechanical property and thermal insulation property. The prepared magnesium oxysulfate cementing material is used for partition walls or plug-in type buildings, the heat preservation performance of the magnesium oxysulfate cementing material can be improved, and the characteristics of high mechanical strength, good water resistance, long service life and the like of the magnesium oxysulfate cementing material can be fully utilized; thereby improving the performance of wall heat preservation and construction, and having good economic and social significance.
In addition, the invention also provides a building component, which is prepared by adopting the magnesium oxysulfate gel adopting the silicon dioxide aerogel and the preparation method. The building member of the present invention has the technical advantages of the magnesium oxysulfate gel material of the silica aerogel.
The preparation method of this example is further illustrated below with reference to specific examples and comparative examples, and the prepared product is tested for correlation performance.
[ example 2.1]
The magnesium oxysulfate cementing material of the embodiment adopts the following proportions: wherein the molar ratio of the light-burned magnesia powder to the magnesium sulfate heptahydrate to the water is 10:1:18, and the content of active magnesia in the light-burned magnesia powder is 57.8%. The modifier is respectively carried out by adopting citric acid, tartaric acid and sodium malate to form three groups of products of the embodiments; wherein, the content of citric acid is 0.75 percent of the weight of the light-burned magnesia powder, and a product of group 1 is formed; the content of tartaric acid is 1.5 percent of the weight of the light-burned magnesia powder to form a product of group 2; the content of the sodium malate is 1.5 percent of the weight of the light-burned magnesia powder, and a product of the group 3 is formed.
In this embodiment, the glass fiber magnesia cementitious material corrugated tile and ridge tile (JC/T747-2002) are used as detection standards, and the flexural strength, compressive strength and thermal conductivity coefficient are measured after 28 days of curing, and the softening coefficient is measured after 7 days of soaking, and the test of the products of the three groups of examples is respectively carried out.
The magnesium oxysulfate gel material of the embodiment is obtained according to the preparation steps, and the ambient temperature of the curing reaction is 25 ℃, the humidity is 65%, and the reaction time is 24 hours; the curing environment temperature was 25 ℃ and the humidity was 65%, and the test results are shown in table 1 below.
TABLE 1 test results of examples
The detection results in table 1 show that the three modifiers adopted by the invention quantitatively contain 0.75% of citric acid and quantitatively contain 1.5% of tartaric acid, and the strength performance of the magnesium oxysulfate cementing material is greatly improved. FIG. 2 and FIG. 3 are electron microscope scanning images of citric acid and tartaric acid modified magnesium oxysulfate binding materials; it can be seen that the modifiers of citric acid and tartaric acid have a significant effect on the strength properties of the magnesium oxysulfate aerogel composite material.
[ example 2.2]
The magnesium oxysulfate gelling material of the embodiment adopts the following proportions: wherein the molar ratio of the light-burned magnesia powder to the magnesium sulfate heptahydrate to the water is 10:1:18, and the content of active magnesia in the light-burned magnesia powder is 57.8%. In this example, citric acid and a mixture of citric acid and tartaric acid were used as modifiers to form two groups of the example products; the product of group 1 is prepared by using citric acid modifier, and the product of group 2 is prepared by using mixture of citric acid and tartaric acid as modifier. Meanwhile, a certain amount of aerogel is added according to the preparation steps to obtain the magnesium oxysulfate aerogel composite material of the embodiment. Wherein the content of citric acid is 0.75 percent of the weight of the light-burned magnesia powder, the content of tartaric acid is 1.5 percent of the weight of the light-burned magnesia powder, and the content of aerogel is 1 percent of the weight of the light-burned magnesia powder.
In this example, the flexural strength, compressive strength and thermal conductivity were measured 28 days after curing and the softening coefficient was measured 7 days after soaking with water, with reference to glass fiber magnesia cementitious materials corrugated tile and ridge tile (JC/T747-2002) as the test standards. The detection results of the two groups of products of the examples are shown in the following table 2.
TABLE 2 test results of examples
The detection results in table 2 show that, when the doping amount of the silica aerogel is the same, the strength performance is reduced with the increase of the types of the added modifiers, but the heat conductivity coefficient is reduced, and the heat preservation effect is increased; fig. 4 shows an electron microscope scan of the magnesium oxysulfate aerogel composite of this example. The experiments show that the magnesium oxysulfate cementing material can effectively enhance the thermal insulation performance of the magnesium oxysulfate cementing material by doping different amounts of aerogel on the basis of adding various modifiers.
Comparative example
On the basis of example 2.2, the comparative example is to mix 1% and 2% of silica aerogel respectively on the basis of the mixture of citric acid and tartaric acid as a modifier to complete the preparation of two groups of magnesium oxysulfate cementing material products; the product of group 1 was prepared using 1% silica aerogel, and the product of group 2 was prepared using 2% silica aerogel. The magnesium oxysulfate cementing material doped with different quantitative silicon dioxide aerogels is prepared from the following raw materials: the magnesium oxide powder comprises light-burned magnesium oxide powder, magnesium sulfate heptahydrate, water, citric acid, tartaric acid and aerogel, wherein the molar ratio of the light-burned magnesium oxide powder to the magnesium sulfate heptahydrate to the water is 10:1:18, the content of active magnesium oxide in the light-burned magnesium oxide powder is 57.8%, the content of the citric acid is 0.75% of the mass of the light-burned magnesium oxide powder, the content of the tartaric acid is 1.5% of the mass of the light-burned magnesium oxide powder, and the doping amount of the silicon dioxide aerogel is 1% and 2% of the mass of the light-burned magnesium oxide powder respectively.
In this comparative example, when the magnesium oxysulfate gel material doped with different amounts of silica aerogel was prepared, the specific preparation method mainly included:
firstly, coating a layer of release agent on a mould, then taking magnesium sulfate solution and modifier, pouring the modifier into the magnesium sulfate solution, and fully stirring at a slow speed to form a mixed solution. Then, respectively and fully stirring the light-burned magnesia powder and different mixed solutions until F, G two groups of slurry with uniform viscosity are formed; the two groups of slurries have different contents of silica aerogel.
Then, respectively injecting the slurry F, G into a mold, removing bubbles, curing and reacting for 24 hours in an environment with the temperature of 25 ℃ and the humidity of 65%, and demolding to obtain a semi-finished product; and finally, curing the demolded semi-finished product in an environment with the temperature of 25 ℃ and the humidity of 65% for 7 days and 28 days to obtain a finished product.
The modifier is prepared as described above, the release agent may be paraffin wax or engine oil, and after slurry F, G is injected into the mold, the foam is removed by vibration, and the mold is scraped and slightly rolled.
In the comparative test of the invention, JC/T747-2002 is still used as a detection standard, and the flexural strength, the compressive strength, the softening coefficient and the thermal conductivity coefficient are used as indexes to detect the magnesium oxysulfate aerogel composite material prepared by the comparative example, and the detection results are shown in the following table 3.
TABLE 3 test results for two sets of comparative example products
As can be seen from the comparison of the tables, the bending strength, compressive strength and water resistance of the magnesium oxysulfate gel material added with 1% of the silica aerogel in the embodiment are reduced compared with those of the magnesium oxysulfate gel material added with 2% of the silica aerogel, but as the mass of the silica aerogel is increased, the heat conductivity coefficient of the product is reduced, and the heat preservation effect is increased; therefore, silica aerogel cannot be incorporated too much, and a potential balance between thermal conductivity and mechanical strength should be considered in a specific application.
Finally, it should be noted that when 1 part magnesium sulfate heptahydrate is used in a molar ratio, different parts of 8, 9, 10, 12, etc. may be used for the light-burned magnesium oxide, and different parts of 15, 17, 19, 22, etc. may be used for the water; the ratio of the molar ratio of the light-burned magnesia powder to the magnesium sulfate heptahydrate to the molar ratio of the water is about 10:1:18, and the requirements of the invention on improving the mechanical property and the heat preservation performance of the product can be met. Similarly, when the content of active magnesium oxide in the light-burned magnesium oxide is 55-65%, the requirement for improving the performance of the product can be met; the content may be 55%, 58%, 62%, 65%, or 57.8% as used in the above examples. The citric acid accounts for 0.7-0.8% of the weight of the light-burned magnesium oxide, and the tartaric acid and the sodium malate account for 1.3-1.8% of the weight of the light-burned magnesium oxide, so that the purpose requirement for improving the product performance can be met.
In summary, the preparation method and the building component made by the method of the present embodiment are magnesium oxysulfate gel materials, and by adding a suitable amount of silica aerogel, the product not only has high thermal insulation performance, but also has high strength performance. When the magnesium oxysulfate aerogel composite material prepared by the preparation method is used as a building component in a building partition wall body and a plug-in type building, the heat insulation performance of the wall body can be effectively improved, and other performances of the wall body can be basically kept unchanged. Therefore, the characteristics of high mechanical strength, good water resistance, long service life and the like of the magnesium oxysulfate cementing material are fully utilized, the performance of a wall body and a building can be improved, the good heat insulation effect of the aerogel can be realized, and the aerogel thermal insulation material has a good application prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (8)
1. The preparation method of the magnesium oxysulfate cementing material adopting the silica aerogel is characterized by comprising a component A and a component B, wherein:
the component A comprises 1 part of magnesium sulfate heptahydrate, 8-12 parts of light burned magnesium oxide and 15-22 parts of water according to the mol ratio, and the content of active magnesium oxide in the light burned magnesium oxide is 55-65%;
the component B comprises a modifier and aerogel; the modifier is citric acid or a mixture of citric acid and tartaric acid, and the aerogel is silicon dioxide aerogel; the citric acid accounts for 0.7-0.8% of the weight of the light-burned magnesia, and the tartaric acid accounts for 1.3-1.8% of the weight of the light-burned magnesia; the mass of the aerogel is 1-2% of that of the light-burned magnesia; and the number of the first and second electrodes,
the preparation method comprises the following steps:
s1. preparing magnesium sulfate heptahydrate solution from magnesium sulfate heptahydrate and water, pouring modifier and aerogel into the magnesium sulfate heptahydrate solution, and stirring to obtain mixed solution;
s2, adding light calcined magnesia with a proportioning requirement into the mixed solution, and fully stirring to form slurry with uniform viscosity;
s3., injecting the slurry into a mold coated with a release agent, removing bubbles in the slurry, and demolding after curing reaction for 22-26 hours at the temperature of 20-30 ℃ and the humidity of 60-70% to obtain a semi-finished product;
s4. curing the semi-finished product in an environment with the temperature of 20-30 ℃ and the humidity of 60-70% for 7 days to obtain the finished product.
2. The method for preparing a magnesium oxysulfate gel material using silica aerogel according to claim 1, characterized in that: the content of the citric acid is 0.75 percent of the weight of the light calcined magnesia, and the content of the tartaric acid is 1.5 percent of the weight of the light calcined magnesia.
3. The method for preparing a magnesium oxysulfate gel material using silica aerogel according to claim 1, characterized in that: the content of the active magnesium oxide in the light-burned magnesium oxide is 57.8%.
4. The method for preparing magnesium oxysulfate gelling material using silica aerogel according to any of claims 1 to 3, characterized in that: the mold is a cast iron mold, and the release agent is paraffin or engine oil.
5. The method for preparing a magnesium oxysulfate gel material using silica aerogel according to claim 4, characterized in that: in step s3, bubbles in the slurry are removed by vibration, and the surface of the slurry in the mold is scraped and rolled.
6. The method for preparing a magnesium oxysulfate gel material using silica aerogel according to claim 4, characterized in that: in step s3, the ambient temperature of the curing reaction is 25 ℃, the humidity is 65%, and the reaction time is 24 hours; in step s5, the ambient temperature for curing was 25 ℃ and the humidity was 65%.
7. The method for preparing a magnesium oxysulfate gel material using silica aerogel according to claim 4, characterized in that: the light-burned magnesia adopts light-burned magnesia powder.
8. A building component, characterized in that it is prepared by the method of any one of claims 1 to 7 for preparing magnesium oxysulfate gel material using silica aerogel.
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