First, what are the advantages of waterborne epoxy floor coatings?
1, water-based environmental protection - water as a dispersion medium, containing no organic solvents or low levels of volatile organic compounds, will not cause air pollution, thus meeting the current requirements of environmental protection;
2, security - truly water-based, odorless, non-combustible, storage, transportation and use during the security greatly improved;
3, a wide range of applications - can be used at room temperature and humid environment, a reasonable curing time, has a high adhesion to many substrates, and also has good recoating of the old substrate;
4, re-coating properties - if you need to re-decoration, does not affect the re-coating, new and old coatings still have good adhesion;
5, excellent overall performance - cured film gloss soft, good texture, excellent corrosion resistance and chemical resistance, and coating shrinkage, high hardness, good wear resistance, excellent electrical insulation properties;
6, the film has excellent unidirectional air permeability - waterborne epoxy floor coating curing there will be a small amount of water in the coating, can avoid solvent-free epoxy floor coating due to curing too dense and cause water vapor inside the concrete can not Remove, produce bubbling, deformation, hollowing or even peeling film defects, waterborne epoxy floor coating due to the special curing of the coating after drying has a microporous structure, can allow water vapor penetration and liquid impermeable, so released The pressure of water vapor inside the concrete fundamentally solves the problem of paint film bubbling;
7, easy to use - construction performance is good, construction tools can be used to clean water directly, reduce construction costs;
8, strong decorative - smooth surface, semi-gloss, matt and a variety of colors to choose from.
Second, why water-based epoxy floor coating will have one-way permeability?
The aqueous epoxy resin and the curing agent are dispersed in the aqueous phase in the form of a dispersed phase. The cross-linking and solidification process causes the particles to interpenetrate and diffuse within the process of moisture evaporation and cross-link reaction occurs. The curing agent molecules are first dispersed with the epoxy resin. The surface contact of the phase particles occurs a curing reaction. As the curing reaction progresses, the molecular weight and the glass transition temperature of the epoxy resin dispersed phase gradually increase, so that the diffusion rate of the curing agent molecules into the epoxy resin dispersed phase particles gradually becomes slower. This means that the epoxy resin disperse phase particles perform less internal curing reactions than their surface, and the internal cross-link density is also low. At the same time as the curing reaction progresses, the dispersed particles of the epoxy resin gradually harden, and it is difficult for the particles to interact and condense into a film. Therefore, it is difficult to form a homogeneous, fully cured coating film compared with solvent-based epoxy resin coatings. This film is not very dense, coupled with a high base ratio of pigment, leaving more open micropores in the paint film.
The radius of these micropores is less than 10-7m. Only the gaseous water molecules can pass through these pores. That is, the underground water vapor can penetrate the paint film in molecular form, and the water on the surface of the paint film is the associated form of water. Large, it is difficult to permeate through the paint film, so the paint film has excellent one-way air permeability. The traditional solvent-based coating resin and curing agent are in the form of molecules in solution, the system is a homogeneous system, so the curing is very complete, the film is very dense, very poor gas permeability, when applied to the base of heavy moisture in the ground When the surface temperature is increased, the penetration pressure of the paint film is increased due to the increase of groundwater vapor. When the permeation pressure is greater than the adhesion between the paint film and the base layer, the paint film is lifted up by the vapor pressure, and the paint film is bubbling and peeling.
Third, the construction of waterborne epoxy floor coating considerations A high-quality paint with a reasonable construction process in order to reflect its excellent performance, floor coating is the same.
Before the application of the primer, the original cement floor shall be hard, smooth and free of sand, free from hollowing, peeling, cracks, etc. If the cement laitance, old paint and adhered garbage are on the ground, they shall be thoroughly removed; It must be cleaned with a cleaning agent. Special treatment shall be performed on the areas with serious oil stains to prevent bad adhesion. If it is a smooth ground such as terrazzo or floor tile, it must be ground to a rough surface; the base surface should be free of visible water or visible water. Leakage; The relative humidity on the site during construction should be less than 85%, and there should be no obvious phenomenon of “floodâ€; the ambient temperature should be above 5°C.
The two-component mixing at the construction site should be full and uniform, and the shear force should be high enough. It is best to use a hand-held electric mixer to stir the paint at 400-800r/min for several minutes so that the epoxy resin can be emulsified. Small particles. During the construction, the time for the use of the paint must be particularly well controlled. The paint can be properly allocated according to the pot life of the paint and the number of site constructors, so as to avoid excessive deployment of the paint at one time, resulting in waste over time.
Roller or brush can be used for construction primers, topcoats and varnishes. The self-leveling paint is coated with a special trowel. The putty is applied by a doctor blade. The application of the mortar layer can be done by squeegeeing. thick.
The inspection standards for the construction completion are as follows: the base oil should be uniformly filmed with a certain brightness; the middle coating and putty coating are not sticky, and there is no softening phenomenon; nail marks are not used for nailing; the top coating is uniform and uniform in color; Blisters, pinholes, etc., have good scratch resistance.
Fourth, the choice of waterborne epoxy floor coatings must consider several issues Waterborne epoxy floor coating with its superior performance is much loved by consumers, consumers in the choice of waterborne epoxy flooring coatings to consider those factors What?
First of all, you must consider the environmental conditions for the use of water-based epoxy floor coatings, including the temperature, humidity, whether it is eroded by water, whether it is exposed to ultraviolet light, and whether the coating is subject to chemical media such as acids, alkalis, and salts. Corrosion, the heavy loads and frequencies that the ground material will be subjected to, such as the frequency of traffic to and from the vehicle.
Second, you must consider your overall performance requirements for waterborne epoxy flooring, such as coating appearance, color, gloss, hardness, abrasion resistance, impact resistance, anti-skid, static conductivity, film thickness, useful life, and more.
In addition, you must consider whether the coating's curing performance is compatible with the construction conditions, such as the coating environment (temperature, humidity, ventilation, etc.), the surface condition of the substrate, the drying time of the coating, the curing time, and so on.
In the end, of course, you have to consider the cost-effectiveness of the coating, from the unit area of ​​paint costs, construction costs, overall performance to comprehensive consideration, choose the preferred use.
1, water-based environmental protection - water as a dispersion medium, containing no organic solvents or low levels of volatile organic compounds, will not cause air pollution, thus meeting the current requirements of environmental protection;
2, security - truly water-based, odorless, non-combustible, storage, transportation and use during the security greatly improved;
3, a wide range of applications - can be used at room temperature and humid environment, a reasonable curing time, has a high adhesion to many substrates, and also has good recoating of the old substrate;
4, re-coating properties - if you need to re-decoration, does not affect the re-coating, new and old coatings still have good adhesion;
5, excellent overall performance - cured film gloss soft, good texture, excellent corrosion resistance and chemical resistance, and coating shrinkage, high hardness, good wear resistance, excellent electrical insulation properties;
6, the film has excellent unidirectional air permeability - waterborne epoxy floor coating curing there will be a small amount of water in the coating, can avoid solvent-free epoxy floor coating due to curing too dense and cause water vapor inside the concrete can not Remove, produce bubbling, deformation, hollowing or even peeling film defects, waterborne epoxy floor coating due to the special curing of the coating after drying has a microporous structure, can allow water vapor penetration and liquid impermeable, so released The pressure of water vapor inside the concrete fundamentally solves the problem of paint film bubbling;
7, easy to use - construction performance is good, construction tools can be used to clean water directly, reduce construction costs;
8, strong decorative - smooth surface, semi-gloss, matt and a variety of colors to choose from.
Second, why water-based epoxy floor coating will have one-way permeability?
The aqueous epoxy resin and the curing agent are dispersed in the aqueous phase in the form of a dispersed phase. The cross-linking and solidification process causes the particles to interpenetrate and diffuse within the process of moisture evaporation and cross-link reaction occurs. The curing agent molecules are first dispersed with the epoxy resin. The surface contact of the phase particles occurs a curing reaction. As the curing reaction progresses, the molecular weight and the glass transition temperature of the epoxy resin dispersed phase gradually increase, so that the diffusion rate of the curing agent molecules into the epoxy resin dispersed phase particles gradually becomes slower. This means that the epoxy resin disperse phase particles perform less internal curing reactions than their surface, and the internal cross-link density is also low. At the same time as the curing reaction progresses, the dispersed particles of the epoxy resin gradually harden, and it is difficult for the particles to interact and condense into a film. Therefore, it is difficult to form a homogeneous, fully cured coating film compared with solvent-based epoxy resin coatings. This film is not very dense, coupled with a high base ratio of pigment, leaving more open micropores in the paint film.
The radius of these micropores is less than 10-7m. Only the gaseous water molecules can pass through these pores. That is, the underground water vapor can penetrate the paint film in molecular form, and the water on the surface of the paint film is the associated form of water. Large, it is difficult to permeate through the paint film, so the paint film has excellent one-way air permeability. The traditional solvent-based coating resin and curing agent are in the form of molecules in solution, the system is a homogeneous system, so the curing is very complete, the film is very dense, very poor gas permeability, when applied to the base of heavy moisture in the ground When the surface temperature is increased, the penetration pressure of the paint film is increased due to the increase of groundwater vapor. When the permeation pressure is greater than the adhesion between the paint film and the base layer, the paint film is lifted up by the vapor pressure, and the paint film is bubbling and peeling.
Third, the construction of waterborne epoxy floor coating considerations A high-quality paint with a reasonable construction process in order to reflect its excellent performance, floor coating is the same.
Before the application of the primer, the original cement floor shall be hard, smooth and free of sand, free from hollowing, peeling, cracks, etc. If the cement laitance, old paint and adhered garbage are on the ground, they shall be thoroughly removed; It must be cleaned with a cleaning agent. Special treatment shall be performed on the areas with serious oil stains to prevent bad adhesion. If it is a smooth ground such as terrazzo or floor tile, it must be ground to a rough surface; the base surface should be free of visible water or visible water. Leakage; The relative humidity on the site during construction should be less than 85%, and there should be no obvious phenomenon of “floodâ€; the ambient temperature should be above 5°C.
The two-component mixing at the construction site should be full and uniform, and the shear force should be high enough. It is best to use a hand-held electric mixer to stir the paint at 400-800r/min for several minutes so that the epoxy resin can be emulsified. Small particles. During the construction, the time for the use of the paint must be particularly well controlled. The paint can be properly allocated according to the pot life of the paint and the number of site constructors, so as to avoid excessive deployment of the paint at one time, resulting in waste over time.
Roller or brush can be used for construction primers, topcoats and varnishes. The self-leveling paint is coated with a special trowel. The putty is applied by a doctor blade. The application of the mortar layer can be done by squeegeeing. thick.
The inspection standards for the construction completion are as follows: the base oil should be uniformly filmed with a certain brightness; the middle coating and putty coating are not sticky, and there is no softening phenomenon; nail marks are not used for nailing; the top coating is uniform and uniform in color; Blisters, pinholes, etc., have good scratch resistance.
Fourth, the choice of waterborne epoxy floor coatings must consider several issues Waterborne epoxy floor coating with its superior performance is much loved by consumers, consumers in the choice of waterborne epoxy flooring coatings to consider those factors What?
First of all, you must consider the environmental conditions for the use of water-based epoxy floor coatings, including the temperature, humidity, whether it is eroded by water, whether it is exposed to ultraviolet light, and whether the coating is subject to chemical media such as acids, alkalis, and salts. Corrosion, the heavy loads and frequencies that the ground material will be subjected to, such as the frequency of traffic to and from the vehicle.
Second, you must consider your overall performance requirements for waterborne epoxy flooring, such as coating appearance, color, gloss, hardness, abrasion resistance, impact resistance, anti-skid, static conductivity, film thickness, useful life, and more.
In addition, you must consider whether the coating's curing performance is compatible with the construction conditions, such as the coating environment (temperature, humidity, ventilation, etc.), the surface condition of the substrate, the drying time of the coating, the curing time, and so on.
In the end, of course, you have to consider the cost-effectiveness of the coating, from the unit area of ​​paint costs, construction costs, overall performance to comprehensive consideration, choose the preferred use.
Jinbaocheng Steel Pipe Manufacturing Co., Ltd , http://www.lc-steelpipes.com