CN111018477A - Magnesium oxysulfate cementing material modifier and preparation method thereof, and modified magnesium oxysulfate cementing material and preparation method thereof - Google Patents
Magnesium oxysulfate cementing material modifier and preparation method thereof, and modified magnesium oxysulfate cementing material and preparation method thereof Download PDFInfo
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- CN111018477A CN111018477A CN201911222312.6A CN201911222312A CN111018477A CN 111018477 A CN111018477 A CN 111018477A CN 201911222312 A CN201911222312 A CN 201911222312A CN 111018477 A CN111018477 A CN 111018477A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/29—Producing shaped prefabricated articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/12—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein one or more rollers exert pressure on the material
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a magnesium oxysulfate cementing material modifier, which is prepared from the following components in percentage by weight: silicone-acrylic emulsion: 5.8% -6.67%, sodium hexametaphosphate: 3.62 to 10 percent of the total weight of the composition, 6.67 to 14.49 percent of gluconic acid, 3.62 to 10 percent of citric acid and 66.67 to 72.46 percent of water. The invention also provides a preparation method of the modifier, and also provides a modified magnesium oxysulfate cementing material adopting the modifier, and a preparation method and application of the material. The magnesium oxysulfate binding material modifier can modify the magnesium oxysulfate binding material modifier, so that the prepared magnesium oxysulfate binding material has the advantages of high mechanical strength, good water resistance and the like, and the service life of the material can be prolonged.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a magnesium oxysulfate cementing material modifier and a preparation method thereof. In addition, the invention also relates to a modified magnesium oxysulfate cementing material adopting the modifier, a preparation method of the modified magnesium oxysulfate cementing material and application of the modified magnesium oxysulfate cementing material.
Background
Along with the rapid development of the building industry, the demand of building materials is more and more great, the preparation of a large amount of traditional cement not only causes certain pollution to the environment, but also the cost of the traditional cement is too high, so that the building cost is continuously increased, and people gradually turn the eyes to other novel building materials which have low cost and can relieve the environmental pollution. China belongs to a large industrial and agricultural country, industrial and agricultural wastes are more and the utilization rate is low, so that the resource waste and the serious environmental pollution are caused once, and the research and development and the manufacture of novel building materials by utilizing the industrial and agricultural wastes are gradually the subject of attention of various enterprises and scientific research institutes in order to reduce the environmental pollution and improve the utilization rate of the industrial and agricultural wastes.
The magnesium oxysulfate cementing material is mainly prepared from light-burned magnesium oxide and magnesium sulfate heptahydrate solution, belongs to an air-hardening cementing material, has the advantages of light weight, good heat insulation performance, low corrosivity on a reinforcing steel bar material and the like as a novel building material, makes up the defects of magnesium oxysulfate cement to a certain extent, has a mechanical strength far lower than that of magnesium oxysulfate cement, and greatly limits the development and application of the magnesium oxysulfate cementing material, so that the magnesium oxysulfate cementing material with high mechanical strength is necessary to obtain.
With the intensive research on the magnesium oxysulfate cementing material, the magnesium oxysulfate cementing material is more and more widely applied and has certain defects, some researchers in the prior art try to modify a magnesium oxysulfate cement system by using citric acid, but the citric acid is found to greatly delay the setting time of the magnesium oxysulfate cement although the mechanical property of the magnesium oxysulfate cement is improved. Some other researchers adopt phosphoric acid or citric acid and fly ash to modify magnesium oxysulfate cement at the same time, but the mechanical strength of the modified magnesium oxysulfate cement is still low, and the 28-day compressive strength is only about 40MPa and still cannot meet the requirements. Therefore, how to prepare the magnesium oxysulfate cementing material with high strength, good water resistance and short setting time is of great significance.
Disclosure of Invention
In view of the above, the present invention aims to provide a magnesium oxysulfate modifier for modifying a magnesium oxysulfate binding material, so as to improve the defect of low mechanical strength of the existing magnesium oxysulfate binding material.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the magnesium oxysulfate cementing material modifier is prepared from the following components in percentage by weight: silicone-acrylic emulsion: 5.8% -6.67%, sodium hexametaphosphate: 3.62 to 10 percent of the total weight of the composition, 6.67 to 14.49 percent of gluconic acid, 3.62 to 10 percent of citric acid and 66.67 to 72.46 percent of water.
Further, the magnesium oxysulfate cementing material modifier is prepared from the following components in percentage by weight: silicone-acrylic emulsion: 5.8%, sodium hexametaphosphate: 3.62 percent, gluconic acid 14.49 percent, citric acid 3.63 percent and water 72.46 percent;
or, the composition is prepared from the following components in percentage by weight: silicone-acrylic emulsion: 6.25%, sodium hexametaphosphate: 6.94 percent of gluconic acid, 10.42 percent of citric acid and 69.4 percent of water;
or, the composition is prepared from the following components in percentage by weight: silicone-acrylic emulsion: 6.67%, sodium hexametaphosphate: 10%, gluconic acid 6.67%, citric acid 10%, and water 66.67%.
Compared with the prior art, the magnesium oxysulfate cementing material modifier has the following advantages:
unmodified magnesium oxysulfate cements have low strength and poor water resistance, mainly due to the absence of 5Mg (OH) from the hydrated product2·MgSO4·7H2O (517 phase) crystal form, and the modifier of magnesium oxysulfate cement of the present invention promotes the water and reaction of the magnesium oxysulfate cement, which can be formed by the reaction represented by the following equationForming a large amount of 517 phase, MgO + (x +1) H2O→[Mg(OH)(H2O)X]++OH-；
Therefore, the modifier of the magnesium oxysulfate cementing material can promote the hydration product of the magnesium oxysulfate cementing material to form a 517 phase, so that the modification of the magnesium oxysulfate cementing material can be realized, and the effect of improving the low mechanical strength of the existing magnesium oxysulfate cementing material is achieved.
The invention also provides a preparation method of the magnesium oxysulfate cementing material modifier, which comprises the following steps:
a, dissolving sodium hexametaphosphate in water, and stirring until the sodium hexametaphosphate is completely dissolved to form a solution R;
b, dissolving gluconic acid and citric acid in the solution R, and stirring until the gluconic acid and the citric acid are completely dissolved to form a mixed solution H;
and c, slowly pouring the styrene-acrylic emulsion into the mixed solution H, stirring until the styrene-acrylic emulsion is completely dissolved, and uniformly stirring to obtain the magnesium oxysulfate cementing material modifier.
Meanwhile, the invention also provides a modified magnesium oxysulfate cementing material which is prepared from the following components in percentage by weight: light-burned magnesia powder: 36.36 to 43.63 percent of magnesium sulfate aqueous solution with the mass percent concentration of 40 to 44 percent: 40.12% -40.91%, magnesium oxysulfate cement modifier as described above: 9.88% -10.91% and one of fly ash, silica fume and metakaolin, wherein the weight ratio of fly ash: 13.64%, silica fume: 9.1%, metakaolin: 4.55 percent.
Further, the modified magnesium oxysulfate cementing material is prepared from the following components in percentage by weight: light-burned magnesia powder: 36.36 percent, and a magnesium sulfate aqueous solution with the mass percentage concentration of 44 percent: 40.12%, fly ash: 13.64%, and magnesium oxysulfate cement modifier as described above: 9.88 percent;
or, the composition is prepared from the following components in percentage by weight: light-burned magnesia powder: 40%, and a 42% magnesium sulfate aqueous solution by mass percent: 40.45%, silica fume: 9.1%, and magnesium oxysulfate cement modifier as described above: 10.45 percent;
or, the composition is prepared from the following components in percentage by weight: light-burned magnesia powder: 43.63%, and a magnesium sulfate aqueous solution with the mass percentage concentration of 40%: 40.91%, metakaolin: 4.55%, and magnesium oxysulfate cement modifier as described above: 10.91 percent.
Compared with the prior art, the magnesium oxysulfate cementing material has the following advantages:
the magnesium oxysulfate binding material of the invention can form 5Mg (OH) in a hydration product of the magnesium oxysulfate binding material by adding the modifier2·MgSO4·7H2The crystal form of O (517 phase) is the main strength source of the magnesium oxysulfate cementing material, the formed crystal forms of 5Mg (OH)2 MgSO4 & 7H2O (517 phase) which are insoluble in water are intersected with each other, and the porosity of the magnesium oxysulfate cementing material can also be reduced, so that compared with the unmodified magnesium oxysulfate cementing material, the modified magnesium oxysulfate cementing material has the advantages that the flexural strength, the compressive strength and the water resistance can be greatly improved, the softening coefficient reaches 0.9, the performance of the magnesium oxysulfate cementing material can be well improved, and the service life of the material can be prolonged.
Meanwhile, after the modifier is added, part of the composite auxiliary materials can be used for replacing the light-burned magnesium oxide, so that the mixing amount of the light-burned magnesium oxide can be reduced, the material cost can be reduced, and the environment-friendly effect is achieved.
The invention also provides a preparation method of the modified magnesium oxysulfate cementing material, which comprises the following steps:
step a, coating a layer of release agent on a mold;
b, taking a magnesium sulfate aqueous solution and a magnesium oxysulfate cementing material modifier, pouring the magnesium oxysulfate cementing material modifier into the magnesium sulfate solution, and fully stirring at a low speed to form a mixed solution;
c, uniformly mixing the light-burned magnesia powder with fly ash or silica fume or metakaolin, and pouring the mixture into the mixed solution in the step b to be fully stirred until slurry A with uniform viscosity is formed;
d, injecting the slurry A into a mold, removing bubbles, performing curing reaction for 24 +/-2 hours in an environment with the temperature of 20-30 ℃ and the humidity of 60-70%, and demolding to obtain a semi-finished product;
and e, curing the demolded semi-finished product for 7d in an environment with the temperature of 20-30 ℃ and the humidity of 60-70% to obtain a finished product.
Further, the release agent is paraffin or engine oil.
Further, in step d, after the slurry A is injected into the mold, bubbles are removed by vibration, and the slurry A is scraped and slightly rolled.
Further, the ambient temperature of the curing reaction in the step d is 25 ℃, the humidity is 65%, and the reaction time is 24 +/-2 hours; and e, maintaining at 25 ℃ and 65% humidity.
In addition, the invention also provides the application of the modified magnesium oxysulfate cementing material, and the modified magnesium oxysulfate cementing material is applied to partition walls and plug-in type buildings.
The modified magnesium oxysulfate cementing material is used for partition walls or plug-in type buildings, and the characteristics of high mechanical strength, good water resistance and long service life of the material can be utilized to improve the performance of the walls and the buildings, so that the modified magnesium oxysulfate cementing material has better use effect.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Example one
The embodiment relates to a magnesium oxysulfate cementing material modifier.
The modifier for the magnesium oxysulfate cementing material is used as a modifier in the preparation of the magnesium oxysulfate cementing material so as to improve the performance of the prepared magnesium oxysulfate cementing material.
Specifically, the magnesium oxysulfate cement modifier of the embodiment is prepared from the following components: the silicone-acrylate emulsion comprises silicone-acrylate emulsion, sodium hexametaphosphate, gluconic acid and citric acid, wherein the components are respectively as follows by weight percent: silicone-acrylic emulsion: 5.8% -6.67%, sodium hexametaphosphate: 3.62 to 10 percent of the total weight of the composition, 6.67 to 14.49 percent of gluconic acid, 3.62 to 10 percent of citric acid and 66.67 to 72.46 percent of water.
The weight percentage of the silicone-acrylic emulsion in the magnesium oxysulfate cement modifier may be, for example, 5.8%, 6.0%, 6.2%, 6.4%, or 6.67%, the weight percentage of sodium hexametaphosphate may be, for example, 3.62%, 5.0%, 6.0%, 7.0%, 8.0%, 9.0%, or 10%, the weight percentage of gluconic acid may be, for example, 6.67%, 8.0%, 9.0%, 10.0%, 11.0%, 12.0%, 13.0%, or 14.49%, the weight percentage of citric acid may be, for example, 3.62%, 5.0%, 6.0%, 7.0%, 8.0%, 9.0%, or 10%, and the weight percentage of water may be, for example, 66.67%, 69.4%, or 72.46%.
It should be noted that the specific weight percentage of each component in the magnesium oxysulfate cement modifier of this embodiment may be adaptively selected in practical applications to satisfy the overall weight ratio.
In addition, when the modifier for magnesium oxysulfate cement material is specifically prepared, firstly, sodium hexametaphosphate is dissolved in water, and stirred until the sodium hexametaphosphate is completely dissolved, then, gluconic acid and citric acid are dissolved in the solution, and stirred until the sodium hexametaphosphate is completely dissolved, so as to form a mixed solution, and finally, the styrene-acrylic emulsion is slowly poured into the mixed solution, stirred until the sodium hexametaphosphate is completely dissolved, and uniformly stirred, so that the modifier for magnesium oxysulfate cement material is obtained.
Specific preparation examples of the magnesium oxysulfate cement modifier of this example will be described in the preparation of the modified magnesium oxysulfate cement of example two below.
Example two
The embodiment relates to a modified magnesium oxysulfate cementing material.
The modified magnesium oxysulfate cementing material of the embodiment is prepared from the following components in percentage by weight: light-burned magnesia powder: 36.36 to 43.63 percent of magnesium sulfate aqueous solution with the mass percent concentration of 40 to 44 percent: 40.12% -40.91%, modifier of magnesium oxysulfate cement in example one: 9.88% -10.91% and one of fly ash, silica fume and metakaolin, wherein the weight ratio of fly ash: 13.64%, silica fume: 9.1%, metakaolin: 4.55 percent.
The modified magnesium oxysulfate binder may contain 36.36%, 37%, 38%, 39%, 40%, 41%, 42%, or 43.63% by weight of the soft-burned magnesium oxide powder, 41%, 42%, 44% by weight of the magnesium sulfate aqueous solution, 40.12%, 40.3%, 40.4%, 40.5%, 40.6%, 40.7%, 40.8%, or 40.91% by weight of the magnesium sulfate aqueous solution.
The weight percentage of fly ash may be, for example, 4.55%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12% or 13.64% when fly ash is used, 4.55%, 5%, 6%, 7%, 8% or 9.1% when silica fume is used, or 2.5%, 3%, 3.5%, 4% or 4.55% when metakaolin is used.
The fly ash is fine ash collected from flue gas generated after coal combustion, and is main solid waste discharged from a coal-fired power plant, the silica fume is formed by collecting and treating smoke dust escaping along with waste gas in the process of smelting industrial silicon and ferrosilicon at high temperature by an industrial electric furnace through a special collecting device, and the metakaolin is a high-activity mineral admixture and is amorphous aluminum silicate formed by calcining superfine kaolin at low temperature. The three materials are common materials in the building field, and the materials are all commercially available products in the embodiment. Wherein the bulk density of the selected fly ash is 555-700kg/m3The silica fume bulk density is 500-700kg/m3And the packing density of metakaolin is 2540-3The product of (1).
Similarly, it should be noted that the specific weight percentage of each component in the magnesium oxysulfate cement of this embodiment may be adaptively selected in practical applications so as to satisfy the requirement of the whole weight ratio.
When the modified magnesium oxysulfate gel material of this example is prepared, a layer of mold release agent is coated on a mold, then the magnesium sulfate aqueous solution and the magnesium oxysulfate gel material modifier of the first example are taken, and the magnesium oxysulfate gel material modifier is poured into the magnesium sulfate solution and stirred sufficiently at a slow speed to form a mixed solution. And then, after the light-burned magnesia powder is uniformly mixed with the fly ash or the silica fume or the metakaolin, pouring the mixture into the mixed solution, and fully stirring the mixture until slurry A with uniform viscosity is formed. And then, injecting the slurry A into a mold, removing bubbles, carrying out curing reaction for 24 +/-2 hours in an environment with the temperature of 20-30 ℃ and the humidity of 60-70%, demolding to obtain a semi-finished product, and finally curing the demolded semi-finished product for 7 days in an environment with the temperature of 20-30 ℃ and the humidity of 60-70% to obtain a finished product.
The release agent can be paraffin or engine oil, and after the slurry A is injected into a mold, bubbles can be removed by optionally vibrating, and the slurry A is strickled off and slightly rolled. In the above curing reaction, the ambient temperature is preferably 25 ℃ and the humidity is 65%, and the reaction time is preferably 24. + -. 2 hours, while the ambient temperature for curing may be preferably 25 ℃ and the humidity is 65%.
The magnesium oxysulfate cement of this example is further illustrated in several preparation examples below.
Example 1
The modified magnesium oxysulfate cementing material of the embodiment adopts the following components in percentage by weight: 36.36 percent of light-burned magnesia powder, 40.12 percent of magnesium sulfate aqueous solution with the mass percentage concentration of 44 percent, 13.64 percent of fly ash and 9.88 percent of magnesium oxysulfate cementing material modifier. Wherein, the modifier for the magnesium oxysulfate cementing material comprises, by weight, 5.8% of silicone-acrylic emulsion, 3.62% of sodium hexametaphosphate, 14.49% of gluconic acid, 3.62% of citric acid and 72.46% of water.
The magnesium oxysulfate cement of this example was obtained according to the preparation procedure described above.
Example 2
The modified magnesium oxysulfate cementing material of the embodiment adopts the following components in percentage by weight: 40% of light-burned magnesia powder, 40.45% of magnesium chloride aqueous solution with the mass percentage concentration of 42%, 9.1% of silica fume and 10.45% of magnesium oxysulfate cementing material modifier. Wherein, the modifier for the magnesium oxysulfate cementing material comprises, by weight, 6.25% of silicone-acrylic emulsion, 6.94% of sodium hexametaphosphate, 10.42% of gluconic acid, 6.94% of citric acid and 69.4% of water.
The magnesium oxysulfate cement of this example was obtained according to the preparation procedure described above.
Example 3
The modified magnesium oxysulfate cementing material of the embodiment adopts the following components in percentage by weight: 43.63% of light-burned magnesia powder, 40.91% of magnesium chloride aqueous solution with the mass percentage concentration of 40%, 4.55% of metakaolin and 10.91% of magnesium oxysulfate cementing material modifier. Wherein, the modifier for the magnesium oxysulfate cementing material comprises, by weight, 6.67% of silicone-acrylic emulsion, 10% of sodium hexametaphosphate, 6.67% of gluconic acid, 10% of citric acid and 66.67% of water.
Also, the magnesium oxysulfate cement of this example was obtained by the foregoing preparation procedure.
The magnesium oxysulfate gel material prepared in the above example was tested using JC/T747-2002 as a test standard and flexural strength, compressive strength and softening coefficient as indexes, and the test results are shown in Table 1 below.
TABLE 1 test results of each example
| Detecting items | Example 1 | Example 2 | Example 3 |
| 28d flexural strength | 17.5MPa | 17.7MPa | 18.5MPa |
| 28d compressive strength | 87.15MPa | 91.2MPa | 91.5MPa |
| Coefficient of softening | ＞0.9 | ＞0.9 | ＞0.9 |
As can be seen from the above Table 1, the magnesium oxysulfate binding material prepared by the components and the preparation method of the embodiment has high mechanical strength, good water resistance and good performance.
In addition, a comparative test was conducted with respect to the magnesium oxysulfate cement prepared as described above, which is specifically as follows.
Comparative experiments the comparative examples used are as follows:
the magnesium oxysulfate cementing material of the comparative example comprises the following components in percentage by weight: 40.87 percent of light-burned magnesia powder, 44.13 percent of magnesium chloride aqueous solution with the mass percentage concentration of 44 percent and 15 percent of fly ash.
The magnesium oxysulfate binder prepared in the above comparative example was also tested using JC/T747-2002 as a test standard, and the results of the tests are compared with those of the above example 1 as shown in Table 2 below.
TABLE 2 comparison of comparative example with example 1
| Detecting items | Example 1 | Comparative example |
| 28d flexural strength | 17.5MPa | 6.7MPa |
| 28d compressive strength | 87.15MPa | 28.6MPa |
| Coefficient of softening | ＞0.9 | 0.61 |
As can be seen from the above Table 2, the modification of the modifier of magnesium oxysulfate in example I can make the prepared magnesium oxysulfate cement have higher mechanical strength and better water resistance, and can obtain better performance.
The embodiment also relates to the application of the modified magnesium oxysulfate cementing material, in particular to the application of the modified magnesium oxysulfate cementing material in partition walls and plug-in type buildings.
In the embodiment, the modified magnesium oxysulfate cementing material is used for partition walls or plug-in type buildings, and the characteristics of high mechanical strength, good water resistance and long service life of the modified magnesium oxysulfate cementing material can be utilized to improve the performance of the walls and the buildings, so that the modified magnesium oxysulfate cementing material has a better use effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A magnesium oxysulfate cementing material modifier is characterized in that: the paint is prepared from the following components in percentage by weight: silicone-acrylic emulsion: 5.8% -6.67%, sodium hexametaphosphate: 3.62 to 10 percent of the total weight of the composition, 6.67 to 14.49 percent of gluconic acid, 3.62 to 10 percent of citric acid and 66.67 to 72.46 percent of water.
2. The magnesium oxysulfate cement modifier according to claim 1, characterized in that: the paint is prepared from the following components in percentage by weight: silicone-acrylic emulsion: 5.8%, sodium hexametaphosphate: 3.62 percent, gluconic acid 14.49 percent, citric acid 3.63 percent and water 72.46 percent;
or, the composition is prepared from the following components in percentage by weight: silicone-acrylic emulsion: 6.25%, sodium hexametaphosphate: 6.94 percent of gluconic acid, 10.42 percent of citric acid and 69.4 percent of water;
or, the composition is prepared from the following components in percentage by weight: silicone-acrylic emulsion: 6.67%, sodium hexametaphosphate: 10%, gluconic acid 6.67%, citric acid 10%, and water 66.67%.
3. The method for preparing a magnesium oxysulfate cement modifier according to claim 1 or 2, characterized in that: the method comprises the following steps:
a, dissolving sodium hexametaphosphate in water, and stirring until the sodium hexametaphosphate is completely dissolved to form a solution R;
b, dissolving gluconic acid and citric acid in the solution R, and stirring until the gluconic acid and the citric acid are completely dissolved to form a mixed solution H;
and c, slowly pouring the styrene-acrylic emulsion into the mixed solution H, stirring until the styrene-acrylic emulsion is completely dissolved, and uniformly stirring to obtain the magnesium oxysulfate cementing material modifier.
4. A modified magnesium oxysulfate cementing material is characterized in that: the paint is prepared from the following components in percentage by weight: light-burned magnesia powder: 36.36 to 43.63 percent of magnesium sulfate aqueous solution with the mass percent concentration of 40 to 44 percent: 40.12% -40.91%, the magnesium oxysulfate cement modifier of claim 1 or 2: 9.88% -10.91% and one of fly ash, silica fume and metakaolin, wherein the weight ratio of fly ash: 13.64%, silica fume: 9.1%, metakaolin: 4.55 percent.
5. The modified magnesium oxysulfate cement according to claim 4, characterized in that: the paint is prepared from the following components in percentage by weight: light-burned magnesia powder: 36.36 percent, and a magnesium sulfate aqueous solution with the mass percentage concentration of 44 percent: 40.12%, fly ash: 13.64%, and the magnesium oxysulfate cement modifier of claim 1 or 2: 9.88 percent;
or, the composition is prepared from the following components in percentage by weight: light-burned magnesia powder: 40%, and a 42% magnesium sulfate aqueous solution by mass percent: 40.45%, silica fume: 9.1%, and the magnesium oxysulfate cement modifier of claim 1 or 2: 10.45 percent;
or, the composition is prepared from the following components in percentage by weight: light-burned magnesia powder: 43.63%, and a magnesium sulfate aqueous solution with the mass percentage concentration of 40%: 40.91%, metakaolin: 4.55%, and the magnesium oxysulfate cement modifier of claim 1 or 2: 10.91 percent.
6. The process for producing a modified magnesium oxysulfate cement according to claim 4 or 5, wherein: the method comprises the following steps:
step a, coating a layer of release agent on a mold;
b, taking a magnesium sulfate aqueous solution and a magnesium oxysulfate cementing material modifier, pouring the magnesium oxysulfate cementing material modifier into the magnesium sulfate solution, and fully stirring at a low speed to form a mixed solution;
c, uniformly mixing the light-burned magnesia powder with fly ash or silica fume or metakaolin, and pouring the mixture into the mixed solution in the step b to be fully stirred until slurry A with uniform viscosity is formed;
d, injecting the slurry A into a mold, removing bubbles, performing curing reaction for 24 +/-2 hours in an environment with the temperature of 20-30 ℃ and the humidity of 60-70%, and demolding to obtain a semi-finished product;
and e, curing the demolded semi-finished product for 7d in an environment with the temperature of 20-30 ℃ and the humidity of 60-70% to obtain a finished product.
7. The process for producing a modified magnesium oxysulfate cement according to claim 6, characterized in that: the release agent is paraffin or engine oil.
8. The process for producing a modified magnesium oxysulfate cement according to claim 6, characterized in that: in step d, after the slurry A is injected into a mold, bubbles are removed by vibration, and the slurry A is strickled off and slightly rolled.
9. The process for producing a modified magnesium oxysulfate cement according to claim 6, characterized in that: in the step d, the ambient temperature of the curing reaction is 25 ℃, the humidity is 65%, and the reaction time is 24 +/-2 hours; and e, maintaining at 25 ℃ and 65% humidity.
10. Use of a modified magnesium oxysulfate cement according to claim 4 or 5, characterized in that: the modified magnesium oxysulfate cementing material is applied to partition walls and plug-in type buildings.
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| CN114656192A (en) * | 2022-04-29 | 2022-06-24 | 山东汇恩特琦科技发展有限公司 | Composite modifier for environment-friendly magnesium oxysulfate product |
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Application publication date: 20200417 |