CN116573911A - Facing material and application thereof - Google Patents

Facing material and application thereof Download PDF

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Publication number
CN116573911A
CN116573911A CN202310557741.9A CN202310557741A CN116573911A CN 116573911 A CN116573911 A CN 116573911A CN 202310557741 A CN202310557741 A CN 202310557741A CN 116573911 A CN116573911 A CN 116573911A
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CN
China
Prior art keywords
water
facing material
mass
magnesia
powder
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Pending
Application number
CN202310557741.9A
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Chinese (zh)
Inventor
钱觉时
李振
张智超
刘雨洁
华莹
汪宏涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing New Magnesium Technology Co ltd
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Chongqing New Magnesium Technology Co ltd
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Priority to CN202310557741.9A priority Critical patent/CN116573911A/en
Publication of CN116573911A publication Critical patent/CN116573911A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/10—Lime cements or magnesium oxide cements
    • C04B28/105—Magnesium oxide or magnesium carbonate cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • 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
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant materials
    • 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
    • C04B2111/80—Optical properties, e.g. transparency or reflexibility
    • C04B2111/82—Coloured materials
    • 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
    • C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Aftertreatments Of Artificial And Natural Stones (AREA)

Abstract

The invention discloses a facing material and application thereof, wherein the facing material takes magnesium oxide as a main component, water reducing and retaining materials are taken as auxiliary components, when in use, a proper amount of water is added, admixture and aggregate are added according to the requirement, and solid with strength and water resistance is formed through hydration and hardening of the magnesium oxide. The facing material is particularly suitable for coating, plastering material, masonry bonding and other parts with decorative effect, has relatively weak alkalinity before hardening, is harmless to the environment in the use process, tends to be neutral after hardening, can continuously absorb carbon dioxide in the hardening process, and can be recycled through calcination; the facing material has very good water resistance and decorative effect, can be used outdoors or in places needing decoration under the condition of moist environment for a long time, and is an environment-friendly inorganic decorative material.

Description

Facing material and application thereof
Technical Field
The invention relates to the technical field of building materials, in particular to a coating, a finishing material and a masonry binding material which have higher strength and water resistance and need decorative effects.
Background
The facing material is usually used for the outdoor and indoor parts of a building, which need better decorative effect, the traditional building uses gypsum cementing material indoors, but the gypsum cementing material is not waterproof, can only be used indoors, can not be used outdoors, and even can not be used in wet parts such as indoor toilets; in addition, the existing decorative materials such as gypsum and the like have lower strength, especially the existing decorative materials are easy to scratch and drop ash or scratch indoors, so that at present, organic coatings capable of forming films are mostly adopted, even though water-soluble organic coatings are adopted, the main body is still organic materials, and a large amount of organic binders and other components are mixed into inorganic materials, and the materials are influenced by volatilization of organic matters and the like, so that the decorative materials have great harm to the environment, and have better water resistance, but are obtained by forming or modifying the organic materials, and once the organic films are scratched by external force, foaming, peeling and peeling are easy to occur, so that the decorative effect is influenced. Therefore, a plurality of places which are easily affected by rainwater or moisture even adopt a decoration method for attaching and hanging ceramic tiles or stones, so that the cost is obviously increased, the construction process is complex, and the application range is small.
Disclosure of Invention
At present, paint, finishing material and decorative mortar with decorative effect are used for building wall surfaces, and cementing materials are mainly of 3 main types of inorganic, organic and inorganic-organic composite materials. Inorganic materials are an important type of facing material because of environmental protection and high strength. The inorganic material mainly adopts gypsum and slaked lime as cementing material components, and compared with the organic material as cementing material components, the inorganic material can form micropores, so that the inorganic material has the advantage of humidity regulation, and has the characteristics of environmental protection and improvement of indoor air quality because no organic component or a small amount of organic matters are contained, so that volatile organic matters are fewer. However, the paint, putty and mortar prepared from the inorganic cementing material are generally not waterproof, and after being wetted, the paint, putty and mortar have the problems of reduced strength, hollowness and the like, cannot play a decorative role, and also have the problems of large shrinkage and cracking due to the adoption of white cement as the cementing material. Aiming at the defects of the existing inorganic decorative coating, finishing material and decorative mortar, the invention aims to provide a finishing material with magnesium oxide as a main component, which has the characteristics of high strength, good decorative effect and excellent water resistance, and can be singly used for finishing in the forms of coating, finishing material and decorative mortar or can be combined for finishing. The facing material of the invention has good decorative effect, high water resistance and high enough strength, so the facing material can be used in places such as building toilets, outer walls and the like which are easy to be wet, and meanwhile, the environment protection and the humidity adjusting capability of the existing inorganic material can be maintained.
The invention provides a facing material, which comprises magnesia powder, a water reducer, a water retaining agent, an admixture, aggregate and water;
wherein the mass of the water reducing agent is not more than 2% of the mass of the magnesia powder; the mass of the water-retaining agent is not more than 3% of the mass of the magnesia powder; the mass of the admixture is not more than 2 times of that of the magnesia powder; the mass of the aggregate is not more than 3 times of that of the magnesia powder; the mass of water is not more than 1.5 times of that of the magnesia powder;
the particle size of the magnesia powder is smaller than 100 microns, and the mass percentage of MgO in the magnesia powder is larger than 85%, so that the sufficient MgO content is ensured to be beneficial to the performance of the facing material. Further preferably, the particle size of the magnesia powder is smaller than 80 microns, so that the pasty facing material prepared by the method has good thixotropic property.
The invention takes magnesium oxide as main component, water reducing agent, water retaining agent and the like as auxiliary components, admixture and aggregate are added, magnesium hydroxide is generated by the reaction of magnesium oxide and water, and part of magnesium hydroxide is carbonized in air to generate magnesium carbonate-containing mineral with gelation property.
Preferably, the magnesia powder is one or a mixture of more of active magnesia, light-burned magnesia and heavy-burned magnesia. The magnesia powder used for the facing coating adopts active magnesia and light burned magnesia, ensures that the facing material has enough whiteness, and is also beneficial to adding pigment to adjust the color of the facing material.
Preferably, the water reducing agent is one of a polycarboxylate water reducing agent and a naphthalene water reducing agent. It is further preferable that the amount of the water reducing agent is not more than 1% by mass of the magnesium oxide powder. The water reducing agent can reduce water consumption, reduce gaps of the hardened body and improve strength.
Preferably, the water-retaining agent is one of cellulose ether, polyacrylamide and lignin fiber. It is further preferable that the amount of the water-retaining agent is not more than 0.3% by mass of the magnesium oxide powder. The water-retaining component adopts cellulose ether and polyacrylamide to prevent the paste and slurry facing materials from bleeding and severely layering before use, and can also ensure that the water is not lost quickly when being smeared or sprayed on the surface to be decorated, thereby ensuring the strength and strength development of the facing materials.
Preferably, the admixture is an inorganic powder that does not react with water.
Preferably, the admixture is selected from one or a mixture of more of fly ash, metakaolin, limestone powder and dihydrate gypsum powder. It is further preferred that the particle size of the admixture is less than 80 microns when the facing material is to be added, and the amount of the admixture is not more than 100% of the mass of the magnesia powder.
Preferably, the aggregate is a particulate material having a particle size of 0.08mm to 5mm and being non-reactive with water.
Preferably, the aggregate is selected from one or more mixtures of natural river sand and machine-made sand. The aggregate amount of the facing material in the form of mortar is not more than 150% of the mass of the magnesia powder.
Preferably, the water is used in an amount of 12-150% of the mass of the magnesia powder. It is further preferable that the amount of water is 15% -100% of the mass of the magnesia powder.
The invention also provides an application of the facing material, which comprises the following steps:
step 1: adding a water reducing agent, a water-retaining agent, an admixture and a collecting material into magnesium oxide powder, and fully mixing to obtain a powdery mixture;
step 2: adding water into the mixture obtained in the step 1 to prepare slurry or paste for standby;
step 3: and (3) coating the slurry or paste obtained in the step (2) on the surface to be decorated in a spraying or smearing mode. After the facing material is initially set, water is sprayed for 1-2 times for maintenance. Maintaining moisture curing accelerates the development of the strength of the facing material and improves the strength of the facing material compared to natural curing in air.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts magnesium oxide as main component, belongs to magnesium inorganic material system, and is mainly calcium inorganic material system, such as gypsum, slaked lime and white cement. Compared with a calcareous system, the solubility of magnesium oxide hydrated into magnesium hydroxide is much lower, so that the pH value is about 10, the magnesium oxide is in a weak alkaline environment, and the magnesium oxide is gradually reduced to be neutral after being carbonized in the later period, is harmless to the environment and is more environment-friendly.
2. The facing material has excellent plasticity, and once the facing material is used for facing, the facing material is easy to quickly solidify to form strength, so that the facing material not only can resist water, but also can develop more quickly by adopting water curing strength. The magnesium oxide, which is the main component of the facing material, is hydrated to generate magnesium hydroxide, and once the facing material is used, the magnesium hydroxide is usually contacted with air, carbon dioxide in the air reacts with the magnesium hydroxide to generate hydrated magnesium carbonate and basic magnesium carbonate, free water contained in the hydrated magnesium carbonate and the basic magnesium carbonate is quickly consumed to generate condensation, and strength is formed in a shorter time, so that the magnesium hydroxide has obvious advantages compared with other materials, particularly the existing inorganic materials, in actual use. Not only are hydrated magnesium carbonate and basic magnesium carbonate water resistant, but strength develops faster in the presence of water.
3. The solid component of the facing material of the present invention can maintain fluidity for more than 48 hours after being mixed with water. Compared with the existing many calcareous inorganic materials, the material has longer preservation time in site use, and particularly has more obvious advantages compared with the calcareous materials such as building gypsum, white cement and the like, the building gypsum needs to be added with retarder to keep fluidity for about 2 hours after water is added, but the performance is obviously reduced by adding the retarder.
4. The facing material can be used as mortar, putty and paint at the same time, and can keep good decorative effect even if common sand with several times of mass is added, so that the facing material can directly adopt the mortar as a decorative layer, and the required decorative effect can be achieved without applying putty on the mortar and painting paint like the prior art.
5. The material of the invention continuously absorbs carbon dioxide in air or water in the later period, the strength is continuously increased, and the water and the carbon dioxide are simultaneously absorbed in the carbonization process to generate micro-expansion, so that the cracking phenomenon can not occur, and the material also has a certain carbon fixing effect.
Detailed Description
The invention will be further illustrated with reference to examples.
1. The relevant test methods and specifications are as follows:
1. the temperature of the test environment is 20+/-5 ℃ and the relative humidity is 50% -70%.
2. The hardness of the coating is measured by a scratch test method, and the paint film hardness is measured by a GB/T6739-2006 color paint and varnish pencil method.
3. Whiteness is measured by a whiteness meter.
4. The bonding strength between the facing coating material and the matrix is tested by a tensile bonding strength test method in JGJ/T70-2009 building mortar basic performance test method Standard.
5. Dough drying time test: coating the facing material on a prepared cement mortar standard test block with the age of more than 28d, covering the surface of the facing material with paper towels, uncovering the paper towels after light pressing, and recording the drying time of the surface of the paper towels without attachments as the surface drying time of the facing material.
6. Dry-wet cycle test: and (3) placing the cement mortar standard test block coated with the facing coating in an oven to be dried for 12 hours at 40 ℃, and then putting the test block into water for 12 hours, so that the test block is circulated once.
2. Examples and comparative examples
Example 1:
the light-burned magnesia with MgO content of 90.5% is adopted, the polycarboxylate water reducer with the light-burned magnesia accounting for 0.3% of the mass of the light-burned magnesia and the polyacrylamide with the light-burned magnesia accounting for 0.02% of the mass of the light-burned magnesia are added, water with the mass of 45% of the light-burned magnesia is added after the mixture is fully mixed, the paste-like facing material is prepared, and the paste-like facing material is placed in a container for preservation, and the water evaporation is prevented during the preservation.
After 1d, the product is used for facing, slightly stirred during use, then coated on a cement mortar standard test block, the thickness is controlled to be 0.5mm-1mm, the scratch results of the surface in dry time and different time are tested, after 1d, dry-wet circulation is carried out, the scratch results are tested after different dry-wet circulation times, and the surface condition of facing materials is observed. Whiteness is measured.
Example 2:
the light-burned magnesia with 86.3 percent of MgO and the heavy-burned magnesia with 89.3 percent of MgO are mixed to be used as magnesia powder, wherein the mass ratio of the light-burned magnesia to the heavy-burned magnesia in the magnesia powder is 3:1. Adding naphthalene water reducer with the total mass of 0.5% of magnesium oxide powder, methyl cellulose ether with the total mass of 0.01% of magnesium oxide powder and phosphogypsum with the total mass of 70% of magnesium oxide powder, mixing thoroughly, and adding water with the total mass of 56% of magnesium oxide powder to prepare the pasty facing material.
And then the surface is smeared on a cement mortar standard test block, the thickness is controlled to be 1mm-2mm, the scratch results of the surface in dry time and different time are tested, the dry-wet cycle is carried out after 1d, the scratch results are tested after different dry-wet cycle times, and the surface condition of the facing material is observed. And (5) molding the bonding strength test piece. The bond strength and whiteness were measured.
Example 3:
the method comprises the steps of adding a polycarboxylic acid water reducer with the weight of 0.2% of light-burned magnesia into light-burned magnesia with the MgO content of 86.3%, adding polyacrylamide with the weight of 0.008% of light-burned magnesia, and adding granite machine-made sand with the weight of 80% of light-burned magnesia, and adding water with the weight of 50% of light-burned magnesia after full mixing to prepare the pasty facing material.
And then the surface is smeared on a cement mortar standard test block, the thickness is controlled to be 2mm-5mm, the scratch results of the surface in dry time and different time are tested, the dry-wet cycle is carried out after 1d, the scratch results are tested after different dry-wet cycle times, and the surface condition of the facing material is observed. And (5) molding the bonding strength test piece. The bond strength and whiteness were measured.
Example 4:
the light burned magnesia with MgO content of 90.5% is added with metakaolin with the mass of 10% and polycarboxylic acid water reducer with the mass of 0.3% and polyacrylamide with the mass of 0.003% to prepare the slurry facing material after fully mixing, and water with the mass of 85% is added.
And then the surface is coated on a cement mortar standard test block, the thickness is controlled to be 0.3mm-0.5mm, the scratch results of the surface in dry time and different time are tested, the dry and wet cycle is carried out after 3d, the scratch results are tested after different dry and wet cycle times, and the surface condition of the facing material is observed. Whiteness is measured.
Example 5:
the mixture of active magnesium oxide with MgO content of 87.2% and light burned magnesium oxide with MgO content of 90.5% is adopted as magnesium oxide powder, wherein the mass ratio of the active magnesium oxide to the light burned magnesium oxide in the magnesium oxide powder is 1:3. Adding a polycarboxylic acid water reducer with the total mass of 0.3% of the magnesium oxide powder and polyacrylamide with the total mass of 0.005% of the magnesium oxide powder, fully mixing, adding water with the total mass of 45% of the magnesium oxide powder, preparing a pasty facing material, placing in a container for preservation, and preventing water evaporation during preservation.
After 3d, the product is used for facing, slightly stirred during use, then coated on a cement mortar standard test block, the thickness is controlled to be 0.5mm-1mm, the scratch results of the surface in dry time and different time are tested, after 1d, dry-wet circulation is carried out, the scratch results are tested after different dry-wet circulation times, and the surface condition of facing materials is observed. Whiteness is measured.
Example 6:
the paste facing material is prepared by adding activated magnesium oxide with the MgO content of 87.2%, a polycarboxylate water reducer with the total mass of 0.3% of the activated magnesium oxide and fly ash with the total mass of 50% of the activated magnesium oxide into the activated magnesium oxide, and adding water with the total mass of 60% of the activated magnesium oxide after the activated magnesium oxide and the fly ash are fully mixed.
And then the surface is smeared on a cement mortar standard test block, the thickness is controlled to be 1mm-2mm, the scratch results of the surface in dry time and different time are tested, the dry-wet cycle is carried out after 1d, the scratch results are tested after different dry-wet cycle times, and the surface condition of the facing material is observed. And (5) molding the bonding strength test piece. The bond strength and whiteness were measured.
Example 7:
the light-burned magnesia with MgO content of 90.5% is adopted, the polycarboxylate water reducer with the total weight of the light-burned magnesia of 0.3% is added, river sand with the total weight of the light-burned magnesia of 75% is fully mixed, and water with the total weight of the light-burned magnesia of 50% is added, so that the paste-like facing material is prepared.
Then smearing the surface-modified adhesive on a cement mortar standard test block, forming an adhesive strength test piece, controlling the thickness to be 1mm-2mm, measuring the surface drying time, selecting one half of the test pieces, spraying water on the surface of the surface-modified adhesive after the surface is dried, wetting the surface of a facing material, spraying water once again after 6 hours, keeping the other half of the test pieces in air, measuring the scratch results of the test pieces under two different curing conditions, carrying out dry-wet circulation after 1d, measuring the scratch results of the test pieces under different curing conditions after different dry-wet circulation times, observing the surface condition of the facing material, and measuring the adhesive strength and whiteness of the test pieces under different curing conditions.
Comparative example 1:
the method comprises the steps of mixing commercially available plastering gypsum with water according to a use instruction to prepare a pasty facing material, controlling the thickness of a cement mortar standard test block to be 0.5mm-1mm, testing the dry time of a surface and scratch results at different times, performing dry-wet circulation after 3d, measuring the scratch results at different times, and observing the surface condition. And (5) molding the bonding strength test piece. The bond strength and whiteness were measured.
3. Performance analysis
Table 1 summary of test results for examples and comparative examples
Note that: the surface state is whether the surface of the facing material has obvious macroscopic change after 10 dry and wet cycles; -indicating that the test was not performed.
By analyzing the detection results, it can be obtained that:
(1) The surface drying time of the facing material is short after the facing material is coated in a paste form, the surface drying state can be usually generated in about 15min, the scratch test result is generally higher, the surface drying time can reach more than 4H, the facing material is relatively long after the facing material is coated in a paste form, the surface drying state usually occurs after 20min, the strength is relatively low, the scratch test result shows that the facing material can reach 1H after 1d, therefore, the paste facing material can be selected for application places with relatively high strength requirements, namely the water consumption of the facing material is relatively low, and the water-gel ratio is controlled to be about 0.40.
(2) The surface of the decorative material has no cracking, powder falling or frosting after the dry and wet circulation, and the scratch test result is higher than that of the decorative material without the dry and wet circulation, so that the decorative material has good water resistance and good volume stability, and can be used in places needing decorative effects when repeatedly subjected to the dry and wet circulation, such as outdoors.
(3) The scratch test value is reduced but not obvious after the finishing material is added with the admixture and the aggregate, which indicates that the finishing material can be used for decoration places with low strength requirements by reducing the cost through adding the admixture and the aggregate.
(4) The whiteness of the light burned magnesia and the active magnesia after hardening can reach over 70 percent, the highest whiteness can reach 89 percent, which shows that the light burned magnesia and the active magnesia have better decorative effect, the light burned magnesia and the active magnesia can be more easily mixed with pigment to meet different use requirements, especially after the admixture is mixed with aggregate, the whiteness is still kept higher, the lowest whiteness can reach 70 percent, and the aggregate and the matrix form better contrast ratio, thereby having special decorative effect.
(5) Example 7 shows that the facing material is subjected to water spraying maintenance after the facing material is dried, the scratch hardness increases more rapidly along with the age, and the early water retention is enhanced when the facing material is thinner, so that the performance of the facing material is better exerted.
(6) Comparing examples 1, 2, 4, 5 and 6 with comparative example 1, the finishing material of the present invention can develop dry finish in a relatively short time after finishing work, but the finishing material of the present invention has a remarkable hardness advantage after hardening, and the pencil hardness of the finishing material of the present invention can be substantially more than 2H, while the finishing material of the present invention is less than 1H. In addition, the pencil hardness of the finishing material is not reduced or even improved after the dry and wet circulation, and the pencil hardness of the finishing material sold in the market is obviously reduced after the dry and wet circulation, which shows that the finishing material has the advantage of water resistance and can solve the problem of no water resistance of the common finishing material.
(7) Examples 1 and 5 show that the facing material of the present invention can be used after being prepared into a paste and placed in a container for 1d and 3d, and the effect of use is not affected as long as no obvious moisture evaporates, while the facing material of comparative example 1 is free of thixotropy and quickly solidifies after 2 hours after being prepared into a paste, indicating that the facing material of the present invention can be used for a relatively long period of time after being added with water when being used on site.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the technical solution, and those skilled in the art should understand that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the present invention, and all such modifications and equivalents are included in the scope of the claims.

Claims (10)

1. A facing material, which is characterized by comprising magnesia powder, a water reducing agent, a water retaining agent, an admixture, aggregate and water;
wherein the mass of the water reducing agent is not more than 2% of the mass of the magnesia powder; the mass of the water-retaining agent is not more than 3% of the mass of the magnesia powder; the mass of the admixture is not more than 2 times of that of the magnesia powder; the mass of the aggregate is not more than 3 times of that of the magnesia powder; the mass of water is not more than 1.5 times of that of the magnesia powder;
the particle size of the magnesia powder is smaller than 100 microns, and the mass percentage of MgO in the magnesia powder is larger than 85%.
2. The facing material of claim 1, wherein the magnesia powder is one or more of activated magnesia, light burned magnesia, and heavy burned magnesia.
3. The facing material of claim 1, wherein the water reducing agent is one of a polycarboxylate water reducing agent and a naphthalene-based water reducing agent.
4. The facing material of claim 1, wherein the water retaining agent is one of cellulose ether, polyacrylamide, and lignin fiber.
5. The facing material of claim 1, wherein the admixture is an inorganic powder that is non-reactive with water.
6. The facing material of claim 5, wherein the admixture is selected from one or more of fly ash, metakaolin, limestone powder, and anhydrite.
7. The facing material of claim 1, wherein the aggregate is a particulate material having a particle size of 0.08mm to 5mm and being non-reactive with water.
8. The facing material of claim 7, wherein the aggregate is selected from one or more of a mixture of natural river sand and machine-made sand.
9. The facing material of claim 1, wherein the water is present in an amount of 12% to 150% by mass of the magnesia powder.
10. Use of a facing material according to any one of claims 1 to 9 for preparing a facing material, comprising in particular the steps of:
step 1: adding a water reducing agent, a water-retaining agent, an admixture and a collecting material into magnesium oxide powder, and fully mixing to obtain a powdery mixture;
step 2: adding water into the mixture obtained in the step 1 to prepare slurry or paste for standby;
step 3: and (3) coating the slurry or paste obtained in the step (2) on the surface to be decorated in a spraying or smearing mode.
CN202310557741.9A 2023-05-17 2023-05-17 Facing material and application thereof Pending CN116573911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310557741.9A CN116573911A (en) 2023-05-17 2023-05-17 Facing material and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310557741.9A CN116573911A (en) 2023-05-17 2023-05-17 Facing material and application thereof

Publications (1)

Publication Number Publication Date
CN116573911A true CN116573911A (en) 2023-08-11

Family

ID=87540865

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310557741.9A Pending CN116573911A (en) 2023-05-17 2023-05-17 Facing material and application thereof

Country Status (1)

Country Link
CN (1) CN116573911A (en)

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