CN111039647A - Composite coating and wall surface construction method - Google Patents
Composite coating and wall surface construction method Download PDFInfo
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- CN111039647A CN111039647A CN201911311796.1A CN201911311796A CN111039647A CN 111039647 A CN111039647 A CN 111039647A CN 201911311796 A CN201911311796 A CN 201911311796A CN 111039647 A CN111039647 A CN 111039647A
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster
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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
- 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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Abstract
The invention relates to a composite coating and a construction method of a wall surface, wherein the composite coating comprises 11-30 wt% of mixed emulsion, 40-70 wt% of aggregate, 5-10 wt% of silica sol, 10-15 wt% of water and the balance of auxiliary agent; the mixed emulsion comprises acrylate copolymer emulsion and acrylate elastic emulsion, the difference value between the maximum particle size and the minimum particle size of first latex in the acrylate copolymer emulsion is less than or equal to 70 mu m, the difference value between the maximum particle size and the minimum particle size of second latex in the acrylate elastic emulsion is less than or equal to 120 mu m, and the difference value between the minimum particle size of the first latex and the maximum particle size of the second latex is less than or equal to 150 mu m. When the composite coating is applied to a wall surface, the formed composite coating layer has good leveling, polishing and sealing effects and can also be used for color mixing, so that leveling putty, polishing putty, alkali-resistant sealing primer and colored middle coating in the traditional building coating can be effectively replaced, the construction number of the wall surface is reduced, the construction period is shortened, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a composite coating and a construction method of a wall surface.
Background
The traditional wall construction method comprises the following steps: the construction method comprises the steps of forming a mortar layer on the surface of a wall body by adopting plastering mortar, leveling the surface of the mortar layer by using putty powder, aligning light and sealing an alkali-resistant sealing primer, and constructing colored middle painting and finish paint according to the requirements of a process system. In the construction process, the number of construction tracks is various, for example, when the putty powder is used for leveling and light finding, the number of construction tracks is generally 2-4 according to the condition of a mortar layer, and the number of construction tracks is 4-6 due to the construction of alkali-resistant seal primer and colored intermediate coat paint, so that the labor cost is greatly increased.
Meanwhile, the putty powder uses cement as a binder, has strong rigidity and is easy to crack, and can cause the phenomenon of alkali reversion once water is leaked, thereby causing paint diseases such as hollowing, finish paint pollution and the like on the wall surface.
Disclosure of Invention
In view of the above, it is necessary to provide a composite coating material and a method for constructing a wall surface; when the composite coating is applied to a wall surface, the formed composite coating layer has good leveling, light finding and sealing effects, can also mix colors, can simplify the construction number of the wall surface, shortens the construction period and saves the cost.
A composite coating comprises 11-30 wt% of mixed emulsion, 40-70 wt% of aggregate, 5-10 wt% of silica sol, 10-15 wt% of water and the balance of auxiliary agent;
the mixed emulsion comprises acrylate copolymer emulsion and acrylate elastic emulsion, wherein the difference value between the maximum particle size and the minimum particle size of first latex in the acrylate copolymer emulsion is less than or equal to 70 mu m, the difference value between the maximum particle size and the minimum particle size of second latex in the acrylate elastic emulsion is less than or equal to 120 mu m, and the difference value between the minimum particle size of the first latex and the maximum particle size of the second latex is less than or equal to 150 mu m.
Furthermore, the particle size of the latex in the acrylic ester copolymerization emulsion is 50-120 μm, and the particle size of the latex in the acrylic ester elastic emulsion is 80-200 μm.
Furthermore, the glass transition temperature of the acrylic ester copolymerization emulsion is 15-25 ℃, the glass transition temperature of the acrylic ester elastic emulsion is lower than that of the acrylic ester copolymerization emulsion, and the difference value is 15-30 ℃.
Furthermore, the mass ratio of the acrylic ester copolymer emulsion to the acrylic ester elastic emulsion is (8-20) to (3-10).
Furthermore, in the composite coating, the mass percentage of the mixed emulsion is 15 wt% -25 wt%, and the mass ratio of the acrylic ester copolymerization emulsion to the acrylic ester elastic emulsion is (10-18): 5-7.
Further, the aggregate comprises at least one of quartz sand, heavy calcium carbonate and textured round sand, and the particle size of the aggregate is 50-200 meshes.
Further, a silane coupling agent is attached to the surface of the aggregate.
Further, the auxiliary agent comprises at least one of an aqueous color paste, a stabilizer, a co-dispersant, a wetting dispersant, a defoaming agent, a pigment, a film-forming auxiliary agent, a cooling liquid base liquid, a sterilizing preservative and a thickening agent.
A wall surface construction method comprises the following steps:
(1) forming a mortar layer on the surface of the wall;
(2) forming the composite coating on the surface of the mortar layer to form a composite coating layer;
(3) and forming a finish paint layer on the surface of the compound coating layer.
Further, repeating step (2) at least once.
In the composite coating, mixed emulsion in which the acrylate copolymer emulsion and the acrylate elastic emulsion exist simultaneously is used as a film forming substance, and the gel degree and the stability of the composite coating can be effectively improved by controlling the particle size distribution of the latex in the mixed emulsion; meanwhile, the composite coating can be well filled and attached to the surface of a mortar layer when forming a composite coating layer by adjusting the grading proportion of aggregate in the coating and combining the action of silica sol. According to the test method in JG/T157-one 2009, the bonding strength of the composite coating layer and the mortar layer can reach more than 0.9MPa, the water permeability of the composite coating layer is less than 0.5mL, and the saltpetering resistance alkalinity reaches more than 48h without abnormity, so that the leveling, light finding and alkali sealing resistance effects are good.
Therefore, when the composite coating is used for wall construction, the leveling putty powder, the polishing putty powder and the alkali-resistant sealing primer in the traditional building coating can be effectively replaced at the same time. Moreover, when coloring is needed, the composite coating can be directly mixed with colors without using colored middle painting, so that the construction number of the wall surface can be reduced, the construction period is shortened, and the cost is saved.
Drawings
FIG. 1 is a schematic view of the wall construction of the present invention;
fig. 2 is a schematic structural view of a conventional wall surface.
In the figure: 10. a wall body; 20. a mortar layer; 30. a composite coating layer; 31. a putty layer; 32. an alkali-resistant seal primer layer; 33. a colored basecoat layer; 40. and a finishing paint layer.
Detailed Description
The composite coating and the wall surface construction method provided by the present invention will be further described below.
The composite coating provided by the invention has good leveling, polishing and sealing effects when forming a composite coating layer, can be directly toned, is very suitable for wall surfaces, and can effectively replace leveling putty powder, polishing putty powder, alkali-resistant sealing primer and colored middle coating in the traditional building coating, thereby reducing the construction number of the wall surfaces, shortening the construction period and saving the cost. Therefore, the following description will be mainly made when the composite coating material is applied to a wall surface.
The composite coating provided by the invention comprises 11-30 wt% of mixed emulsion, 40-70 wt% of aggregate, 5-10 wt% of silica sol, 10-15 wt% of water and the balance of auxiliary agent;
the mixed emulsion comprises acrylate copolymer emulsion and acrylate elastic emulsion, wherein the difference value between the maximum particle size and the minimum particle size of first latex in the acrylate copolymer emulsion is less than or equal to 70 mu m, the difference value between the maximum particle size and the minimum particle size of second latex in the acrylate elastic emulsion is less than or equal to 120 mu m, and the difference value between the minimum particle size of the first latex and the maximum particle size of the second latex is less than or equal to 150 mu m.
The acrylate copolymer emulsion has excellent cohesiveness, weather resistance, film forming property, light and color retention and mechanical properties, but has high glass transition temperature, and can be broken along with fine cracks on a mortar layer along with the change of environmental temperature in the long-term use process, so that the sealing effect on the fine cracks on the surface of the mortar layer is lost, and paint defects appear on the wall surface. And the acrylic ester elastic emulsion is added with soft monomers, so that the glass transition temperature is low, and certain resilience, toughness and excellent elongation can be kept in a large temperature range. Therefore, the composite coating of the invention takes the mixed emulsion of the acrylate copolymer emulsion and the acrylate elastic emulsion as the main film forming substance and is endowed with the performances of the two emulsions, so that the composite coating layer has certain flexibility after the composite coating layer is formed, the composite coating layer can not be broken along with fine cracks on the mortar layer, the fine cracks on the surface of the mortar layer can be well sealed, the water permeability is reduced, the alkali return is prevented, and the probability of paint diseases such as hollowing, finish paint pollution and the like on the wall surface is effectively reduced.
In order to obtain a composite coating layer with better sealing performance, in some embodiments, the mass ratio of the acrylate copolymer emulsion to the acrylate elastic emulsion in the mixed emulsion is (8-20): (3-10), and the mass percentage of the acrylate copolymer emulsion is greater than that of the acrylate elastic emulsion.
Furthermore, in the composite coating, the mass percentage of the mixed emulsion is 15 wt% -25 wt%, and the mass ratio of the acrylic ester copolymerization emulsion to the acrylic ester elastic emulsion is (10-18): 5-7.
Meanwhile, the acrylic ester copolymer emulsion, the acrylic ester elastic emulsion and other components are mixed together, and the uniformity of the latex is better by controlling the particle size distribution of the latex in the mixed emulsion, so that the fluidity and the permeability of the composite coating can be improved, the speed of coagulation, flocculation and other phenomena of the emulsion can be reduced, and the gel degree and the stability of the composite coating can be effectively improved. Meanwhile, by adjusting the filling proportion of the aggregate in the composite coating and combining the action of the silica sol, the composite coating can well fill and adhere to the surface of a mortar layer when forming a composite coating layer, so that the adhesive force is improved, and the composite coating further has good leveling, light finding and alkali sealing resisting effects.
In order to better improve the uniformity of the latex, in some embodiments, the particle size of the latex in the acrylate copolymer emulsion is 50 to 120 μm, and the particle size of the latex in the acrylate elastic emulsion is 80 to 200 μm.
In some embodiments, the glass transition temperature of the acrylate copolymer emulsion is 15-25 ℃ and the glass transition temperature of the acrylate elastic emulsion is lower than the glass transition temperature of the acrylate copolymer emulsion by controlling the content of the hard monomer in the acrylate copolymer emulsion and the content of the soft monomer in the acrylate elastic emulsion, and the difference is 15-30 ℃, so that the lowest film forming temperature of the composite coating is 0-5 ℃.
The aggregate comprises at least one of quartz sand, heavy calcium carbonate and round textured sand, and the particle size of the aggregate is preferably 50-200 meshes in order to enable the composite coating to be better filled and attached to the surface of the mortar layer.
In some embodiments, in order to further improve the filling effect of the composite coating, the aggregate is a mixed aggregate comprising any two or three of quartz sand, heavy calcium carbonate and texture round sand, and the particle size of the quartz sand in the mixed aggregate is preferably 150 meshes to 200 meshes, the particle size of the texture round sand is preferably 50 meshes to 120 meshes, and the particle size of the heavy calcium carbonate is preferably 150 meshes to 200 meshes.
Further, in actual use, depending on the condition of the mortar layer, the composite coating layer needs to be flat, the more aggregates with larger particle size in the composite coating, the larger the particle size of the aggregates, the smaller the relative surface area, and at this time, the usage amount of the mixed emulsion can be correspondingly reduced. Similarly, when the composite coating layer needs to be found, the more aggregates with smaller particle sizes are in the composite coating, and the smaller the particle size of the aggregates, the larger the relative surface area is, and at this time, the usage amount of the mixed emulsion can be correspondingly increased.
In some embodiments, the surface of the aggregate is attached with a silane coupling agent. After the aggregate modified by the silane coupling agent forms the composite coating layer, the bonding strength of the aggregate and a mortar layer interface can be improved, and meanwhile, a waterproof layer can be formed on the surface of the aggregate, so that the sealing property of the composite coating layer is improved.
Specifically, the process of modifying the aggregate with the silane coupling agent comprises the following steps: adding aggregate into a high-speed heating type mixer, opening the mixer, heating and keeping the temperature between 90 and 130 ℃, adding a silane coupling agent, stirring to hydrolyze the silane coupling agent and form hydrogen bonds with hydroxyl on the surface of the aggregate, heating and drying to perform dehydration reaction to form partial covalent bonds, wrapping the covalent bonds on the surface of the silane coupling agent, and cooling and sieving after 20 minutes to obtain the aggregate with the silane coupling agent attached to the surface.
Wherein the mass ratio of the aggregate to the silane coupling agent in modification is 98-99.5: 0.5-2.
Further, the silica sol comprises at least one of BS-620, CH-83 and TUS-2.
In the composite coating, the performance of the composite coating can be improved by adding an auxiliary agent, and the composite coating has other functions.
For example, when the wall surface needs to have a ground color, the traditional construction method is to perform colored middle painting after the construction of the alkali-resistant sealing primer, and the color can not be directly adjusted in the alkali-resistant sealing primer. In the composite coating, a sufficient carrier can be provided for the water-based color paste, so that the water-based color paste is sufficiently dispersed in the composite coating and the performance of the composite coating is not influenced, therefore, when the ground color is needed on the wall surface, the water-based color paste can be directly added into the composite coating for color mixing, and the adding amount of the water-based color paste is 0.3 to 0.5 weight percent of the composite coating.
Specifically, the auxiliary agent further comprises at least one of a stabilizer, a co-dispersant, a wetting dispersant, an antifoaming agent, a pigment, a film-forming auxiliary agent, a cooling liquid base liquid, a sterilization preservative and a thickening agent.
Wherein, the stabilizer can be selected from hydroxyethyl cellulose, and specifically comprises at least one of HBR-250, HD-30000 and 3500, and the addition amount of the stabilizer is 0.2-0.4 wt% of the composite coating.
The co-dispersing agent can reduce the dosage of the wetting dispersing agent, disperse the pigment, reduce air bubbles, effectively control the pH value and reduce the cost. The co-dispersant comprises at least one of SN-95 and APM-95, and the addition amount of the co-dispersant is 0.1 wt% -0.15 wt% of the composite coating.
The wetting dispersant comprises at least one of 2008, H-306, PE-100, 5027, 5029 and 5040, and the addition amount of the wetting dispersant is 0.1-0.5 wt% of the composite coating.
The defoaming agent comprises at least one of MX-68, SN-345, CF-245 and NXZ, and the addition amount of the wetting defoaming agent is 0.05 wt% -0.15 wt% of the composite coating.
The pigment can be titanium dioxide, specifically comprises at least one of R-706, R-996 and BLR-895, and the addition amount of the pigment is 0.5-3 wt% of the composite coating.
The film-forming aid comprises at least one of dodecyl alcohol ester and ethylene glycol monobutyl ether, and the addition amount of the film-forming aid is 0.5-2 wt% of the composite coating.
The cooling liquid base liquid comprises at least one of propylene glycol and ethylene glycol, and the addition amount of the cooling liquid base liquid is 0.5-2 wt% of the composite coating.
The bactericidal preservative comprises at least one of SN-020, WL-3, WL-86 and BM-75, and the addition amount of the bactericidal preservative is 0.1 wt% -0.2 wt% of the composite coating.
The thickening agent comprises at least one of DR-72, D-305, T-30 and ASE-60, and the addition amount of the thickening agent is 0.1-1 wt% of the composite coating.
The invention also provides a construction method of the wall surface, which comprises the following steps:
(1) forming a mortar layer on the surface of the wall;
(2) forming the composite coating on the surface of the mortar layer to form a composite coating layer;
(3) and forming a finish paint layer on the surface of the compound coating layer.
Therefore, the composite coating can effectively replace leveling putty powder, polishing putty powder and alkali-resistant seal primer in the traditional building coating, and can be directly toned even when coloring is needed without using colored middle coating. Therefore, the invention can carry out the construction of the finish paint layer only by constructing one composite coating layer, effectively reduces the construction number of the wall surface, shortens the construction period and saves the cost.
Referring to fig. 1 and 2, the wall surface obtained by the construction method of the present invention includes a wall body 10, and a mortar layer 20, a compound coating layer 30 and a finish paint layer 40 sequentially disposed on the surface of the wall body 10, whereas the wall surface obtained by the conventional construction method includes the wall body 10, and the mortar layer 20, a putty layer 31, an alkali-resistant sealer paint layer 32, a colored intermediate paint layer 33 and the finish paint layer 40 sequentially disposed on the surface of the wall body 10.
In order to improve the quality of the compound coating layer 30, in some embodiments, the present invention may repeat the step (2) at least once, and the compound coating layer 30 is formed by applying the compound coating twice or more.
Further, when the composite coating layer 30 is formed through two or more times of construction, the content of the aggregates having a small particle size in the composite coating gradually increases as the number of times of construction increases, and the content of the aggregates having a large particle size gradually decreases as the number of times of construction increases.
According to the test method in JG/T157-2009, the bonding strength between the coating formed by the composite coating and the mortar layer can reach more than 0.9MPa, the water permeability of the coating is less than 0.5mL, and the salt-forming resistance alkalinity reaches more than 48h without abnormality, so that the composite coating has good leveling, light finding and sealing effects.
Hereinafter, the composite coating and the method for constructing a wall surface will be further described with reference to the following specific examples.
Example 1:
the composite coating comprises the following components in percentage by mass: 10% water, 0.3% hydroxyethylcellulose (3 ten thousand viscosity) HD-30000; 0.1 percent of co-dispersant APM-95, 0.2 percent of wetting dispersant PE-100 and 5027, 0.15 percent of defoaming agent NXZ, 0.5 percent of titanium pigment R996, 10 percent of acrylate copolymer emulsion (Tg is 25 ℃, the particle size of the emulsion is 50-120 mu m), 5 percent of acrylate elastic emulsion (Tg is-5 ℃, the particle size of the emulsion is 80-200 mu m), 5 percent of silica sol CH-83, 0.5 percent of film forming aid dodecyl alcohol ester, 0.5 percent of propylene glycol, 0.15 percent of sterilization preservatives WL-3 and WL-86, 30 percent of 50-60 mesh texture round sand, 37 percent of 150 mesh quartz sand, 0.4 percent of thickening agent DR-72 and 0.2 percent of water-based color paste.
The preparation method of the composite coating comprises the following steps: adding hydroxyethyl cellulose into water, dropwise adding a co-dispersant after complete dispersion, then adding a wetting dispersant, a defoaming agent, titanium dioxide, an acrylate copolymer emulsion, an acrylate elastic emulsion and silica sol, dropwise adding a film assistant, propylene glycol and a sterilizing preservative under a stirring state, adding texture round sand and quartz sand after uniformly stirring, dropwise adding a thickening agent for thickening, and adding an aqueous color paste for adjusting the color.
In the embodiment, 50-60-mesh round sand and 150-mesh quartz sand are added as aggregate and are constructed on a mortar layer to replace putty powder, alkali-resistant seal primer and colored middle paint.
Example 2:
the composite coating comprises the following components in percentage by mass: 10% water, 0.3% hydroxyethylcellulose (3 ten thousand viscosity) HBR-250; 0.1 percent of co-dispersant APM-95, 0.2 percent of wetting dispersant PE-100 and 5027, 0.15 percent of defoaming agent MX-68, 0.5 percent of titanium white R996, 10 percent of acrylate copolymer emulsion (Tg is 25 ℃, and the particle size of the emulsion is 50-120 mu m), 5 percent of acrylate elastic emulsion (Tg is-5 ℃, and the particle size of the emulsion is 80-200 mu m), 5 percent of silica sol BS620, 0.5 percent of film forming aid dodecyl alcohol ester, 0.5 percent of propylene glycol, 0.15 percent of sterilization preservative WL-3 and WL-86, 30 percent of 80-120 mesh texture round sand, 37 percent of 200 mesh heavy calcium carbonate, 0.4 percent of thickening agent DR-72 and D-305 and 0.2 percent of water-based color paste.
The preparation method of the composite coating comprises the following steps: adding hydroxyethyl cellulose into water, dropwise adding a co-dispersant after complete dispersion, then adding a wetting dispersant, a defoaming agent, titanium dioxide, an acrylate copolymer emulsion, an acrylate elastic emulsion and silica sol, dropwise adding a film assistant, propylene glycol and a sterilizing preservative under a stirring state, adding texture round sand and heavy calcium carbonate after uniformly stirring, dropwise adding a thickening agent for thickening, and adding a water-based color paste for adjusting the color.
In the embodiment, 80-120 mesh round sand and 200 mesh heavy calcium carbonate are added as aggregate and are constructed on a mortar layer to replace putty powder, alkali-resistant sealing primer and colored middle paint.
Example 3:
the composite coating comprises the following components in percentage by mass: 10% water, 0.3% hydroxyethylcellulose (3 ten thousand viscosity) HBR-250; 0.1 percent of co-dispersant APM-95, 0.2 percent of wetting dispersant PE-100 and 5027, 0.15 percent of defoamer SN-345, 0.5 percent of titanium white R-706, 10 percent of acrylate copolymer emulsion (Tg is 25 ℃, the particle size of the emulsion is 50-120 mu m), 5 percent of acrylate elastic emulsion (Tg is-5 ℃, the particle size of the emulsion is 80-200 mu m), 5 percent of silica sol CH-83, 0.5 percent of film forming aid dodecyl alcohol ester, 0.5 percent of propylene glycol, 0.15 percent of sterilization preservatives WL-3 and WL-86, 40 percent of 150-mesh quartz sand, 12 percent of 200-mesh quartz sand, 15 percent of 200-mesh heavy calcium carbonate, 0.4 percent of thickening agents DR-72 and D-305, and 0.2 percent of water-based color paste.
The preparation method of the composite coating comprises the following steps: adding hydroxyethyl cellulose into water, dropwise adding a co-dispersant after complete dispersion, then adding a wetting dispersant, a defoaming agent, titanium dioxide, an acrylate copolymer emulsion, an acrylate elastic emulsion and silica sol, dropwise adding a film assistant, propylene glycol and a sterilizing preservative under a stirring state, adding quartz sand and heavy calcium carbonate after uniformly stirring, dropwise adding a thickening agent for thickening, and adding an aqueous color paste for adjusting the color.
In the embodiment, 150-mesh quartz sand, 200-mesh quartz sand and 200-mesh heavy calcium carbonate are added as aggregate and are constructed on a mortar layer to replace putty powder, alkali-resistant sealing primer and colored middle paint.
Example 4:
in this example, the composite coating material of example 1 was applied to a mortar layer, and the composite coating material of example 2 was applied to a composite coating layer formed from the composite coating material of example 1.
Example 5:
the composite coating comprises the following components in percentage by mass: 10% water, 0.3% hydroxyethylcellulose (3 ten thousand viscosity) HBR-250; 0.1 percent of co-dispersant APM-95, 0.2 percent of wetting dispersant PE-100 and 5027, 0.15 percent of defoamer SN-345, 0.5 percent of titanium white R-706, 11 percent of acrylate copolymer emulsion (Tg is 25 ℃, the particle size of the emulsion is 50-120 mu m), 6 percent of acrylate elastic emulsion (Tg is-5 ℃, the particle size of the emulsion is 80-200 mu m), 5 percent of silica sol CH-83, 0.5 percent of film forming aid dodecyl alcohol ester, 0.5 percent of propylene glycol, 0.15 percent of sterilization preservative WL-3 and WL-86, 30 percent of silane coupling agent modified texture round sand with 80-120 meshes, 35 percent of silane coupling agent modified heavy calcium carbonate with 200 meshes, 0.4 percent of thickening agent DR-72 and D-305, and 0.2 percent of water-based color paste.
The preparation method of the composite coating comprises the following steps: adding hydroxyethyl cellulose into water, dropwise adding a co-dispersant after complete dispersion, then adding a wetting dispersant, a defoaming agent, titanium dioxide, an acrylate copolymer emulsion, an acrylate elastic emulsion and silica sol, dropwise adding a film assistant, propylene glycol and a sterilizing preservative under a stirring state, adding texture round sand and heavy calcium carbonate after uniformly stirring, dropwise adding a thickening agent for thickening, and adding a water-based color paste for adjusting the color.
In the embodiment, the textured round sand modified by the silane coupling agent of 80 meshes to 120 meshes and the ground limestone modified by the silane coupling agent of 200 meshes are added as aggregate, and the aggregate is constructed on a mortar layer to replace putty powder, alkali-resistant seal primer and colored middle paint.
Example 6:
the composite coating comprises the following components in percentage by mass: 10% water, 0.3% hydroxyethylcellulose (3 ten thousand viscosity) HBR-250; 0.1 percent of co-dispersant APM-95, 0.2 percent of wetting dispersant PE-100 and 5027, 0.15 percent of defoamer SN-345, 0.5 percent of titanium pigment R-706, 12 percent of acrylate copolymer emulsion (Tg is 25 ℃, the particle size of the emulsion is 50 mu m to 120 mu m), 7 percent of acrylate elastic emulsion (Tg is-5 ℃, the particle size of the emulsion is 80 mu m to 200 mu m), 5 percent of silica sol CH-83, 0.5 percent of film-forming aid dodecyl alcohol ester, 0.5 percent of propylene glycol, 0.15 percent of sterilization preservatives WL-3 and WL-86, 37 percent of quartz sand modified by silane coupling agent with 150 meshes, 13 percent of quartz sand modified by silane coupling agent with 200 meshes, 15 percent of ground calcium carbonate modified by silane coupling agent with 200 meshes, 0.4 percent of thickening agents DR-72 and D-305 and 0.2 percent of water-based color paste.
The preparation method of the composite coating comprises the following steps: adding hydroxyethyl cellulose into water, dropwise adding a co-dispersant after complete dispersion, then adding a wetting dispersant, a defoaming agent, titanium dioxide, an acrylate copolymer emulsion, an acrylate elastic emulsion and silica sol, dropwise adding a film assistant, propylene glycol and a sterilizing preservative under a stirring state, adding quartz sand and heavy calcium carbonate after uniformly stirring, dropwise adding a thickening agent for thickening, and adding an aqueous color paste for adjusting the color.
In the embodiment, 150-mesh silane coupling agent modified quartz sand, 200-mesh silane coupling agent modified quartz sand and 200-mesh silane coupling agent modified heavy calcium carbonate are added as aggregates and are constructed on a mortar layer to replace putty powder, alkali-resistant seal primer and colored middle paint.
The results of testing the composite coating layers of examples 1-6 of the present invention are shown in table 1.
TABLE 1
As can be seen from Table 1, the key indexes of examples 1-6 all meet the type I and type II standards of the primers in JG/T157-2009 (R type) and GB/T9755-2014. Among them, as can be seen from examples 1 to 4, since the aggregate of example 1 has a relatively large particle size and the water permeability and the saltpetering resistance are relatively low as compared with examples 2 and 3, in actual construction, the use of example 1 in combination with example 2 or example 3 as in example 4 can effectively achieve leveling and polishing of the wall surface, and the alkali-resistant seal primer layer and the colored intermediate paint layer can be omitted, and the next operation can be directly performed on the coating. It is understood from examples 1 to 3, 5 and 6 that the aggregate in examples 5 and 6 was modified to improve both the adhesive strength and the water permeability.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The composite coating is characterized by comprising 11-30 wt% of mixed emulsion, 40-70 wt% of aggregate, 5-10 wt% of silica sol, 10-15 wt% of water and the balance of auxiliary agent;
the mixed emulsion comprises acrylate copolymer emulsion and acrylate elastic emulsion, wherein the difference value between the maximum particle size and the minimum particle size of first latex in the acrylate copolymer emulsion is less than or equal to 70 mu m, the difference value between the maximum particle size and the minimum particle size of second latex in the acrylate elastic emulsion is less than or equal to 120 mu m, and the difference value between the minimum particle size of the first latex and the maximum particle size of the second latex is less than or equal to 150 mu m.
2. The composite coating of claim 1, wherein the latex in the acrylate copolymer emulsion has a particle size of 50 μm to 120 μm, and the latex in the acrylate elastic emulsion has a particle size of 80 μm to 200 μm.
3. The composite coating according to claim 1, wherein the glass transition temperature of the acrylate copolymer emulsion is 15 ℃ to 25 ℃, the glass transition temperature of the acrylate elastic emulsion is lower than the glass transition temperature of the acrylate copolymer emulsion, and the difference between the glass transition temperature of the acrylate elastic emulsion and the glass transition temperature of the acrylate copolymer emulsion is 15 ℃ to 30 ℃.
4. The composite coating of claim 1, wherein the mass ratio of the acrylate copolymer emulsion to the acrylate elastic emulsion is (8-20) to (3-10).
5. The composite coating of claim 1, wherein the composite coating comprises 15 wt% to 25 wt% of the mixed emulsion, and the mass ratio of the acrylic copolymer emulsion to the acrylic elastic emulsion is (10-18) to (5-7).
6. The composite coating of claim 1, wherein the aggregate comprises at least one of quartz sand, ground limestone and round textured sand, and the particle size of the aggregate is 50-200 meshes.
7. The composite coating of claim 1, wherein a silane coupling agent is attached to the surface of the aggregate.
8. The composite coating of claim 1, wherein the additives comprise at least one of aqueous color pastes, stabilizers, co-dispersants, wetting dispersants, defoamers, pigments, film forming aids, coolant-based fluids, antimicrobial preservatives, thickeners.
9. A wall surface construction method is characterized by comprising the following steps:
(1) forming a mortar layer on the surface of the wall;
(2) forming the composite coating of any one of claims 1 to 8 on the surface of the mortar layer to form a composite coating layer;
(3) and forming a finish paint layer on the surface of the compound coating layer.
10. A method of constructing a wall surface according to claim 9 wherein step (2) is repeated at least once.
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| CN114605886A (en) * | 2022-04-15 | 2022-06-10 | 广州龙文建材有限公司 | Exterior wall coating for building and preparation method thereof |
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