CN112897966A - Calcium carbonate-based inorganic coating and preparation and use methods thereof - Google Patents
Calcium carbonate-based inorganic coating and preparation and use methods thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00508—Cement paints
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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
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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
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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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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- 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
Abstract
The invention discloses a calcium carbonate-based inorganic coating and a preparation method and a use method thereof. The calcium carbonate-based inorganic coating is prepared from the following raw materials in parts by weight: 60-80 parts of carbonized cementing material, 1.5-2 parts of polycarboxylate water reducer, 5-10 parts of inorganic nano dispersant, 1.6-2.4 parts of polymer emulsion, 1-1.2 parts of carbonization reinforcing agent, 0.3-0.5 part of stabilizer and 24-28 parts of water. The preparation method is simple, the variety of the required raw materials is few, the cost is low, the curing time is short, the preparation process can simultaneously cure carbon dioxide, and the preparation method accords with the green energy-saving and emission-reducing concept of the modern society; the calcium carbonate-based inorganic coating provided by the invention has excellent aging resistance, corrosion resistance and high temperature resistance, and can be used as surface corrosion resistance of structural materials such as steel structures or reinforced concrete under severe service environments such as ocean and the like.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a calcium carbonate-based inorganic coating and a preparation method and a use method thereof.
Background
The marine environment contains a large amount of salt substances, so that the marine environment has a serious corrosion effect on steel structures, concrete and other marine engineering materials, and the marine corrosion accounts for about 1/3 of total corrosion. The marine concrete corrosion damage in 2018 caused about 2000 hundred million losses.
The anticorrosive paint is uniformly coated on the surface of a protected body to form a compact protective layer so as to prevent the entry of an environmental erosion medium and protect the material from corrosion. Anticorrosive coatings are mainly classified into organic coatings and inorganic coatings. In the production and application processes of the organic coating, partial components can be released, certain harm is caused to the environment and human bodies, and the high temperature resistance and the aging resistance of the organic coating are generally poor. In response to the above problems, some silicate and phosphate inorganic coatings have been developed in succession. However, the two inorganic coatings generally need to be completely cured at high temperature, which has an adverse effect on the corrosion resistance of the protected layer and limits the application range thereof. In recent years, although silicate and phosphate inorganic coatings cured at room temperature have been developed, the preparation process is complicated and the curing time is long.
Disclosure of Invention
In view of the above, there is a need to provide a calcium carbonate-based inorganic coating, and a preparation method and a use method thereof, so as to solve the technical problems of complicated preparation process and long curing time of the inorganic coating of the normal temperature curing system in the prior art.
The invention provides a calcium carbonate-based inorganic coating, which consists of the following raw materials in parts by weight: 60-80 parts of carbonized cementing material, 1.5-2 parts of polycarboxylate water reducer, 5-10 parts of inorganic nano dispersant, 1.6-2.4 parts of polymer emulsion, 1-1.2 parts of carbonization reinforcing agent, 0.3-0.5 part of stabilizer and 24-28 parts of water.
The second aspect of the present invention provides a method for preparing a calcium carbonate-based inorganic coating material, comprising the steps of:
s1: preparing a polycarboxylic acid water reducing agent, a carbonization reinforcing agent and water into a solution;
s2: and adding the inorganic nano dispersant, the stabilizer and the solution into the carbonized cementing material, stirring, then adding the polymer emulsion, and continuously stirring uniformly to obtain the calcium carbonate-based inorganic coating.
The method for preparing the calcium carbonate-based inorganic coating material provided by the second aspect of the present invention is used to obtain the calcium carbonate-based inorganic coating material provided by the first aspect of the present invention.
A third aspect of the present invention provides a method for using a calcium carbonate-based inorganic coating material, comprising the steps of:
the calcium carbonate-based inorganic coating provided by the first aspect of the present invention is applied to the surface of a substrate, and then the calcium carbonate-based inorganic coating is formed on the surface of the substrate through carbonization curing.
Compared with the prior art, the invention has the beneficial effects that:
the preparation method is simple, the variety of the required raw materials is few, the cost is low, the curing time is short, the preparation process can simultaneously cure carbon dioxide, and the preparation method accords with the green energy-saving and emission-reducing concept of the modern society;
the calcium carbonate-based inorganic coating provided by the invention has excellent aging resistance, corrosion resistance and high temperature resistance, and can be used as surface corrosion resistance of structural materials such as steel structures or reinforced concrete under severe service environments such as ocean and the like.
Drawings
FIG. 1 is a slurry rheology curve of the calcium carbonate-based inorganic coating material obtained in example 1 of the present invention after various standing times at 25 ℃.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a calcium carbonate-based inorganic coating, which consists of the following raw materials in parts by weight: 60-80 parts of carbonized cementing material, 1.5-2 parts of polycarboxylate water reducer, 5-10 parts of inorganic nano dispersant, 1.6-2.4 parts of polymer emulsion, 1-1.2 parts of carbonization reinforcing agent, 0.3-0.5 part of stabilizer and 24-28 parts of water.
According to the invention, the carbonized cementing material is gamma-type dicalcium silicate, monocalcium silicate, tricalcium silicate or steel slagOne or more of (a); preferably, the carbonized cementing material is gamma-C2And S. According to the invention, the carbonized cementing material with lower hydration activity and higher carbonization activity is selected as the main component of the inorganic coating, so that the inorganic coating can quickly form a coating with higher strength through a carbonization process after being coated on the surface of a substrate. Meanwhile, the hydration activity of each raw material composition in the system is extremely low, and the material cannot be hardened under the condition of not introducing carbon dioxide, so that the system is favorable for long-time storage.
Further, selected gamma-C2S is powder with the particle size distribution of 0.5-100 mu m and the apparent density of 2.8-3.0 g/cm3. Further, gamma-C2S is prepared by high-temperature sintering of a calcareous raw material and a siliceous raw material. Wherein, the calcium material is calcium hydroxide, calcium carbonate or raw materials (such as carbide slag, limestone powder, thiourea slag, cyanamide slag and the like) rich in calcium hydroxide and calcium carbonate, the siliceous material is silicon dioxide or raw materials (such as quartz stone powder, sandstone, quartz sand tailings, gold tailings and the like) rich in silicon dioxide, and the calcium material and the siliceous material are mixed according to equivalent weight of calcium oxide: molar ratio of silica 2: 1, adding water after mixing, uniformly stirring and drying, and then sintering at 1300-1400 ℃.
According to the invention, the polycarboxylate superplasticizer is added to enable the polycarboxylate superplasticizer to be adsorbed on the surfaces of particles, so that the particles are prevented from agglomerating through charge exclusion and steric hindrance composite effects, and the dispersing performance is improved. Further, the water reducing rate of the selected polycarboxylate superplasticizer is 25-35%.
According to the invention, the inorganic nano dispersant is one or two of silica fume and nano calcium carbonate. According to the invention, by adding the inorganic nano dispersant, the fluidity of the slurry can be improved, and the using amount of water is reduced, so that the spraying smoothness and the overall strength of the coating are improved. Further, SiO in the selected silica fume2The content is 90-98%, and the specific surface area is 20000-25000 m2Per kg; the particle size of the selected nano calcium carbonate is 0.01-0.1 mu m.
According to the invention, the polycarboxylate water reducer and the inorganic nano dispersant are compounded, so that the synergistic effect of the polycarboxylate water reducer and the inorganic nano dispersant can be fully exerted, the viscosity of the coating slurry can be regulated and controlled, and the comprehensive performance of the coating can be improved.
According to the invention, the polymer emulsion is one or two of epoxy resin modified styrene-acrylic emulsion and styrene-acrylic emulsion. Further, the solid content of the polymer emulsion is 30-60%. According to the invention, the epoxy resin modified styrene-acrylic emulsion and the styrene-acrylic emulsion are added to serve as the polymer emulsion, so that the effects of reducing porosity and preventing water can be achieved, and the overall corrosion resistance of the coating is further improved. However, the addition amount is not suitable to be too much or too little, and if the addition amount is too little, the corrosion prevention effect is poor; if the addition amount is too large, carbonization is not facilitated, and the comprehensive performance of the coating is poor.
According to the invention, the carbonization reinforcing agent is one or two of polyvinyl alcohol and chitosan. According to the invention, the calcium ion dissolution of the carbonized cementing material in the carbonization process can be improved by adding the carbonization reinforcing agent, and the carbonization degree is increased, so that the carbonization strength is enhanced and the comprehensive performance of the coating is improved. Furthermore, the granularity of the chitosan is 100-130 meshes, the ash content is less than 0.5%, the water content is less than 0.5%, and the deacetylation degree is more than 90%.
According to the invention, the above-mentioned stabilizer is calcium oxide. According to the invention, calcium oxide is added as a stabilizer, so that the slurry can be pseudocoagulated, the slurry is prevented from settling, and the viscosity of the slurry can be recovered under the action of a lower shearing force after the slurry is stored for a long time, thereby being beneficial to long-time storage.
The second aspect of the present invention provides a method for preparing a calcium carbonate-based inorganic coating material, comprising the steps of:
s1: preparing a polycarboxylic acid water reducing agent, a carbonization reinforcing agent and water into a solution;
s2: and adding the inorganic nano dispersant, the stabilizer and the solution into the carbonized cementing material, stirring, then adding the polymer emulsion, and continuously stirring uniformly to obtain the calcium carbonate-based inorganic coating.
The method for preparing the calcium carbonate-based inorganic coating material provided by the second aspect of the present invention is used to obtain the calcium carbonate-based inorganic coating material provided by the first aspect of the present invention.
In the invention, the feeding sequence of each component needs to be strictly controlled, so that the problems of poor slurry dispersion effect and influence on coating performance after direct mixing are avoided.
According to the invention, in the step S2, the stirring speed of the two-step stirring process is 100-150 r/min, and the stirring time is 30-60S. Under these conditions, the solid particles can be well dispersed and well mixed with the liquid.
A third aspect of the present invention provides a method for using a calcium carbonate-based inorganic coating material, comprising the steps of:
the calcium carbonate-based inorganic coating provided by the first aspect of the present invention is applied to the surface of a substrate, and then the calcium carbonate-based inorganic coating is formed on the surface of the substrate through carbonization curing.
According to the invention, the coating process can be carried out in the modes of spraying, dipping and brushing; preferably by means of high-pressure injection.
According to the present invention, the carbonization and curing conditions are as follows: the carbonization temperature is 5-40 ℃, the relative humidity is 10-60%, the volume concentration of carbon dioxide is 70-99.8%, the air pressure is 0.2-0.4 MPa, and the curing time is 6-12 h.
In the invention, the substrate is one or more of concrete, wood and metal, and is specifically a steel plate.
In order to avoid redundancy, in the following examples and comparative examples of the present invention, some of the raw materials are summarized as follows:
γ-C2s is prepared from the following components in a molar ratio of 2: 1, adding water with the same mass as the mixture of the calcium hydroxide and the silicon dioxide, continuously mixing, and sintering at 1400 ℃ for 3 hours.
Food-grade chitosan: from national gold lake crustacean ltd; styrene-acrylic emulsion: zhan Xin viscopol 6191; epoxy resin modified styrene-acrylic emulsion: zhengzhou Senjie chemical 13-689; polyvinyl alcohol: polyvinyl alcohol 1788, chemical purity; polycarboxylic acid high-efficiency water reducing agent: from watson cement.
Example 1
The embodiment provides a calcium carbonate-based inorganic coating, which is obtained by the following steps:
(1) preparing 1.5g of polycarboxylic acid high-efficiency water reducing agent, 1.04g of chitosan and 26g of water into a solution;
(2) 7.5g of silica fume, 0.38g of calcium oxide and the prepared solution were added to 60g of gamma-C2And (4) uniformly stirring, adding 2g of epoxy resin modified styrene-acrylic emulsion, and continuously uniformly stirring to obtain the calcium carbonate-based inorganic coating. Wherein the stirring speed is 100r/min, and the stirring time is 30 s.
The embodiment also provides a using method of the calcium carbonate-based inorganic coating, which comprises the following steps:
the inorganic coating is uniformly coated on the surface of a matrix in a high-pressure spraying mode, and then is cured in a carbon dioxide atmosphere to form a calcium carbonate-based inorganic coating on the surface of the matrix. Wherein the pressure of the carbonization environment is 0.2MPa, the gas concentration is 99 percent, the curing time is 12h, the temperature is 25 ℃, and the relative humidity is 60 percent.
Example 2
The embodiment provides a calcium carbonate-based inorganic coating, which is obtained by the following steps:
(1) preparing 1.5g of polycarboxylic acid high-efficiency water reducing agent, 1.04g of chitosan and 26g of water into a solution;
(2) 7.5g of silica fume, 0.38g of calcium oxide and the prepared solution were added to 60g of gamma-C2And (4) uniformly stirring in the S, then adding 2g of styrene-acrylic emulsion, and continuously stirring to obtain the calcium carbonate-based inorganic coating. Wherein the stirring speed is 100r/min, and the stirring time is 30 s.
The embodiment also provides a using method of the calcium carbonate-based inorganic coating, which comprises the following steps:
the inorganic coating is uniformly coated on the surface of a matrix in a high-pressure spraying mode, and then is cured in a carbon dioxide atmosphere to form a calcium carbonate-based inorganic coating on the surface of the matrix. Wherein the pressure of the carbonization environment is 0.2MPa, the gas concentration is 99 percent, the curing time is 12h, the temperature is 25 ℃, and the relative humidity is 60 percent.
Example 3
The embodiment provides a calcium carbonate-based inorganic coating, which is obtained by the following steps:
(1) preparing 2g of polycarboxylic acid high-efficiency water reducing agent, 1g of polyvinyl alcohol and 24g of water into a solution;
(2) 5g of nano calcium carbonate, 0.3g of calcium oxide and the prepared solution are added into 62g of gamma-C2And (4) uniformly stirring, adding 1.6g of epoxy resin modified styrene-acrylic emulsion, and continuously stirring to obtain the calcium carbonate-based inorganic coating. Wherein the stirring speed is 150r/min, and the stirring time is 60 s.
The embodiment also provides a using method of the calcium carbonate-based inorganic coating, which comprises the following steps:
the inorganic coating is uniformly coated on the surface of a matrix in a high-pressure spraying mode, and then is cured in a carbon dioxide atmosphere to form a calcium carbonate-based inorganic coating on the surface of the matrix. Wherein the carbonization environment pressure is 0.3MPa, the gas concentration is 70%, the curing time is 8h, the temperature is 5 ℃, and the relative humidity is 10%.
Example 4
The embodiment provides a calcium carbonate-based inorganic coating, which is obtained by the following steps:
(1) preparing 2g of polycarboxylic acid high-efficiency water reducing agent, 1.2g of chitosan and 28g of water into a solution;
(2) 10g of silica fume, 0.5g of calcium oxide and the prepared solution were added to 80g of gamma-C2And (4) stirring the mixture evenly in the S, then adding 2.4g of styrene-acrylic emulsion, and continuing stirring to obtain the calcium carbonate-based inorganic coating. Wherein the stirring speed is 120r/min, and the stirring time is 45 s.
The embodiment also provides a using method of the calcium carbonate-based inorganic coating, which comprises the following steps:
the inorganic coating is uniformly coated on the surface of a matrix in a high-pressure spraying mode, and then is cured in a carbon dioxide atmosphere to form a calcium carbonate-based inorganic coating on the surface of the matrix. Wherein the carbonization environment pressure is 0.4MPa, the gas concentration is 80%, the curing time is 6h, the temperature is 40 ℃, and the relative humidity is 40%.
Comparative example 1
Comparative example 1 differs from example 1 only in that no polymer emulsion was added in comparative example 1, and the specific composition of the obtained calcium carbonate-based inorganic coating material was as follows:
γ-C2s60 g, polycarboxylate superplasticizer 15g, 7.5g of silica fume, 1.04g of chitosan, 0.38g of calcium oxide and 26g of water.
Comparative example 2
Comparative example 2 differs from example 1 only in that no carbonation enhancer was added to comparative example 2, and the specific composition of the resulting calcium carbonate-based inorganic coating material was as follows:
γ-C260g of S, 1.5g of polycarboxylic acid high-efficiency water reducing agent, 7.5g of silica fume, 2g of epoxy resin modified styrene-acrylic emulsion, 0.38g of calcium oxide and 26g of water.
Comparative example 3
Comparative example 3 differs from example 1 only in that no polycarboxylic acid water reducing agent was added in comparative example 3, and the specific composition of the obtained calcium carbonate-based inorganic coating material was as follows:
γ-C260g of S, 9g of silica fume, 2g of epoxy resin modified styrene-acrylic emulsion, 1.04g of chitosan, 0.38g of calcium oxide and 26g of water.
Comparative example 4
Comparative example 4 is different from example 1 only in that no inorganic nano-dispersant is added in comparative example 4, and the specific composition of the obtained calcium carbonate-based inorganic coating is as follows:
γ-C260g of S, 9g of polycarboxylic acid high-efficiency water reducing agent, 2g of epoxy resin modified styrene-acrylic emulsion, 1.04g of chitosan, 0.38g of calcium oxide and 26g of water.
Comparative example 5
Comparative example 5 differs from example 1 only in that no stabilizer was added in comparative example 5, and the specific composition of the obtained calcium carbonate-based inorganic coating material was as follows:
γ-C260g of S, 1.5g of polycarboxylic acid high-efficiency water reducing agent, 7.5g of silica fume, 2g of epoxy resin modified styrene-acrylic emulsion, 1.04g of chitosan and 26g of water.
Comparative example 6
Comparative example 6 differs from example 1 only in that comparative example 6 was added with a large amount of the polymer emulsion, and the specific composition of the obtained calcium carbonate-based inorganic coating material was as follows:
γ-C260g of S, 1.5g of polycarboxylic acid high-efficiency water reducing agent, 7.5g of silica fume, 2.6g of epoxy resin modified styrene-acrylic emulsion, 1.04g of chitosan, 0.38g of calcium oxide and 26g of water.
Comparative example 7
Comparative example 7 differs from example 1 only in that the carbonization atmosphere pressure was 0.1 MPa.
Comparative example 8
Comparative example 8 is different from example 1 only in that gamma-C is directly added during the preparation of the calcium carbonate-based inorganic paint260g of S, 1.5g of polycarboxylic acid high-efficiency water reducing agent, 7.5g of silica fume, 2g of epoxy resin modified styrene-acrylic emulsion, 1.04g of chitosan, 0.38g of calcium oxide and 26g of water are mixed and stirred for 5 min.
The coatings obtained in the above examples 1 to 4, comparative examples 1 to 6 and comparative example 8 were subjected to performance tests, and the results are shown in FIG. 1 and Table 1; wherein, the rheological property is tested by a rheometer; the normal temperature storage stability of the coating is determined by observing the slurry state of the coating after standing for 30 days.
TABLE 1
| Sealing and standing at 25 deg.C for 30 days | |
| Example 1 | Pseudo-coagulation, no sedimentation and easy stirring |
| Example 2 | Pseudo-coagulation, no sedimentation and easy stirring |
| Example 3 | Pseudo-coagulation, no sedimentation and easy stirring |
| Example 4 | Pseudo-coagulation, no sedimentation and easy stirring |
| Comparative example 1 | Pseudo-coagulation, no sedimentation and easy stirring |
| Comparative example 2 | Pseudo-coagulation, no sedimentation and easy stirring |
| Comparative example 3 | Can not be made into slurry |
| Comparative example 4 | Partial settlement and difficult stirring |
| Comparative example 5 | Complete sedimentation and difficult stirring |
| Comparative example 6 | Pseudo-coagulation, no sedimentation and easy stirring |
| Comparative example 8 | Partial settlement and difficult stirring |
As can be seen from FIG. 1, the rheological curve remained substantially unchanged after standing for 240h, indicating that the obtained calcium carbonate-based inorganic coating had good stability and the slurry could be stored for a long time.
It can be seen from table 1 that the coatings obtained in examples 1 to 4 of the present invention are pseudocoagulated and do not settle after standing for 30 days, and the viscosity can be recovered under a lower shear force during use, which indicates that the obtained coatings have good storage stability.
Test group 2
The coatings formed in examples 1-4, comparative examples 1-2, and comparative examples 4-8 were tested for performance, the results are shown in Table 2, and the test standards are as follows:
and (3) testing the adhesive force: GB-T9286-1998;
and (3) hardness testing: GB-T6739-2006;
ultraviolet aging test: GB-T14522-2008;
salt spray test: GB-T1771-2007;
heat resistance: GB-T1735-2009.
TABLE 2
As can be seen from Table 2, the coatings formed in the embodiments 1 to 4 of the invention have high adhesive force and hardness and good aging resistance, heat resistance and corrosion resistance.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The calcium carbonate-based inorganic coating is characterized by comprising the following raw materials in parts by weight: 60-80 parts of carbonized cementing material, 1.5-2 parts of polycarboxylate water reducer, 5-10 parts of inorganic nano dispersant, 1.6-2.4 parts of polymer emulsion, 1-1.2 parts of carbonization reinforcing agent, 0.3-0.5 part of stabilizer and 24-28 parts of water.
2. The calcium carbonate-based inorganic coating according to claim 1, wherein the carbonized cementitious material is one or more of gamma-dicalcium silicate, monocalcium silicate, tricalcium disilicate and steel slag.
3. The calcium carbonate-based inorganic coating material as claimed in claim 1, wherein the water reducing rate of the polycarboxylic acid water reducing agent is 25 to 35%.
4. The calcium carbonate-based inorganic coating material of claim 1, wherein the inorganic nano-dispersant is one or both of silica fume and nano-calcium carbonate.
5. The calcium carbonate-based inorganic coating material according to claim 1, wherein the polymer emulsion is one or both of an epoxy resin-modified styrene-acrylic emulsion and a styrene-acrylic emulsion.
6. The calcium carbonate-based inorganic coating material according to claim 1, wherein the carbonization enhancer is one or both of polyvinyl alcohol and chitosan.
7. The calcium carbonate-based inorganic coating material according to claim 1, wherein the stabilizer is calcium oxide.
8. A method for preparing the calcium carbonate-based inorganic paint according to any one of claims 1 to 7, comprising the steps of:
preparing a polycarboxylic acid water reducing agent, a carbonization reinforcing agent and water into a solution;
and adding the inorganic nano dispersant, the stabilizer and the solution into the carbonized cementing material, stirring, then adding the polymer emulsion, and continuously stirring uniformly to obtain the calcium carbonate-based inorganic coating.
9. A method for using calcium carbonate-based inorganic coating comprises the following steps:
the calcium carbonate-based inorganic coating material according to any one of claims 1 to 7 is applied to the surface of a substrate, and then the calcium carbonate-based inorganic coating material is formed on the surface of the substrate through carbonization and curing.
10. The use method of the calcium carbonate-based inorganic coating material according to claim 9, wherein the carbonization curing is performed under the following conditions: the carbonization temperature is 5-40 ℃, the relative humidity is 10-60%, the volume concentration of carbon dioxide is 70-99.8%, the air pressure is 0.2-0.4 MPa, and the curing time is 6-12 h.
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Cited By (6)
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|---|---|---|---|---|
| CN113402243A (en) * | 2021-06-23 | 2021-09-17 | 武汉理工大学 | Method for improving durability of concrete product by using carbonized coating |
| CN113880466A (en) * | 2021-11-04 | 2022-01-04 | 山东汉博昱洲新材料有限公司 | Method for preparing high-carbonization-activity cementing material by using industrial waste residues |
| CN114605875A (en) * | 2022-03-30 | 2022-06-10 | 武汉理工大学 | Double-layer organic-inorganic composite building energy-saving coating material and preparation method thereof |
| CN114656811A (en) * | 2022-04-12 | 2022-06-24 | 武汉理工大学 | Fireproof heat-preservation heat-insulation inorganic coating material and preparation method thereof |
| CN115490468A (en) * | 2022-10-14 | 2022-12-20 | 山东京韵泰博新材料科技有限公司 | Protective coating for building, protection method and application |
| CN116285449A (en) * | 2023-02-22 | 2023-06-23 | 中交第一航务工程局有限公司 | High-strength high-durability coating and preparation method thereof |
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| CN110922107A (en) * | 2019-11-22 | 2020-03-27 | 武汉理工大学 | Color carbide hardened material and preparation method and application thereof |
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| JP2004026629A (en) * | 2002-05-07 | 2004-01-29 | Sekisui Chem Co Ltd | Carbonated hardened body and method of manufacturing the same |
| JP2006232602A (en) * | 2005-02-24 | 2006-09-07 | Denki Kagaku Kogyo Kk | Surface coating material and construction method for planning maintenance using the same |
| CN109824321A (en) * | 2019-03-14 | 2019-05-31 | 东南大学 | A kind of prefabricated pervious concrete of curing with carbon dioxide and preparation method thereof |
| CN110156383A (en) * | 2019-04-30 | 2019-08-23 | 中建材中岩科技有限公司 | A kind of micro-nano crystallization renovation agent of distress in concrete and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113402243A (en) * | 2021-06-23 | 2021-09-17 | 武汉理工大学 | Method for improving durability of concrete product by using carbonized coating |
| CN113880466A (en) * | 2021-11-04 | 2022-01-04 | 山东汉博昱洲新材料有限公司 | Method for preparing high-carbonization-activity cementing material by using industrial waste residues |
| CN114605875A (en) * | 2022-03-30 | 2022-06-10 | 武汉理工大学 | Double-layer organic-inorganic composite building energy-saving coating material and preparation method thereof |
| CN114656811A (en) * | 2022-04-12 | 2022-06-24 | 武汉理工大学 | Fireproof heat-preservation heat-insulation inorganic coating material and preparation method thereof |
| CN114656811B (en) * | 2022-04-12 | 2023-03-14 | 武汉理工大学 | Fireproof heat-preservation heat-insulation inorganic coating material and preparation method thereof |
| CN115490468A (en) * | 2022-10-14 | 2022-12-20 | 山东京韵泰博新材料科技有限公司 | Protective coating for building, protection method and application |
| CN116285449A (en) * | 2023-02-22 | 2023-06-23 | 中交第一航务工程局有限公司 | High-strength high-durability coating and preparation method thereof |
| CN116285449B (en) * | 2023-02-22 | 2024-03-22 | 中交第一航务工程局有限公司 | High-strength high-durability coating and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112897966B (en) | 2022-07-12 |
| NL2030769A (en) | 2022-09-08 |
| NL2030769B1 (en) | 2022-10-10 |
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