CN115353787B - Energy-saving emission-reducing heat-insulating anti-condensation water-based paint and preparation method and construction process thereof - Google Patents
Energy-saving emission-reducing heat-insulating anti-condensation water-based paint and preparation method and construction process thereof Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D143/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
- C09D143/04—Homopolymers or copolymers of monomers containing silicon
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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Abstract
The invention discloses an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, a preparation method and a construction process thereof. The coating comprises: the paint comprises silicone-acrylic emulsion, fumed silica, titanium dioxide, hollow glass beads, a dispersion anti-settling agent, a film forming auxiliary agent, a flash rust inhibitor, a defoaming agent, a leveling agent, a pH regulator and deionized water. The heat conductivity coefficient of the paint film is reduced to 0.09 w/m.K, and the heat conduction can be effectively slowed down so as to prevent abrupt occurrence of temperature difference; the microscopic surface of the paint film is rough, a plurality of tiny pores can be generated, and small molecules in the environment can be adsorbed, so that the environment humidity is reduced; the two principles are synergistic, so that the dew formation is fundamentally prevented, and after the film thickness is required by coating the product, the dew formation prevention effect can be achieved without any additional energy and manpower consumption, and the product is convenient to construct, energy-saving and emission-reducing.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to an energy-saving emission-reducing heat-insulating anti-condensation water-based coating, a preparation method and a construction process thereof.
Background
Dew condensation generally refers to the phenomenon that when outdoor facilities such as buildings and outdoor electric cabinets have a high temperature difference between day and night and a high humidity in autumn and winter or in plum rain, and the structural temperature of the outdoor facilities is lower than the dew point temperature of the air in the buildings and outdoor electric cabinets, water vapor is condensed on the inner surface of the outdoor facilities to form water drops. Dew condensation may cause serious consequences or cause great damage: (1) When dew condensation occurs in a building, the dew condensation water contaminates the inner side surface of a living room, articles stored indoors and the like, and can cause mildew and accelerate the damage of building materials, particularly for industrial buildings, the dew condensation water has great influence on plant structures and operators in the plant, and can cause corrosion, mildew and the like of produced products, thereby reducing the quality of the products and causing adverse effects; (2) For outdoor cabinets, computer rooms, precision instruments, instrument rooms and the like with circuits (boards), if dew condensation and water dripping occur, the problem becomes more serious, and even malignant accidents such as operation failure, testing disorder, line damage and the like can be caused.
The interior of outdoor buildings is generally dehumidified, for example, by a dehumidifier, an air conditioner and adsorptive dehumidifying materials (such as dehumidifying bags and diatomite paint), so that not only is electric energy consumed or the dehumidifying materials (dehumidifying bags) need to be replaced regularly, but also the effect is general, especially in underground building parts, dew and mold are extremely easy to appear on inner wall surfaces, ground surfaces and the like, and besides, paint anti-dewing products similar to diatomite paint with adsorption function mostly require thicker film thickness (such as centimeter level) and have better effect of adsorbing moisture in the environment. The outdoor electric cabinet and the like usually use ventilating fans, air conditioners and the like, the principle is that humidity and internal-external temperature difference inside the cabinet body are reduced, so that dew condensation is prevented, but in power distribution cabinets and signal tower power distribution rooms where people trace are rare, regular manual inspection is needed for whether the air conditioners and the exhaust fans work normally or not and whether dew condensation occurs or not, and time and labor are consumed.
If the paint having the condensation preventing function is used, the paint can be classified into two kinds: 1. the paint product having the adsorption function by adding the porous filler is generally composed of resin, porous material, stabilizer, auxiliary agent, water, other pigment and filler and the like. The method has several characteristics: firstly, the moisture absorption volume has a certain thickness; the coating film is porous, and the inside of the coating film is provided with communicated pores which can contain condensed water adsorbed on the surface; thirdly, materials such as super absorbent resin and diatomaceous earth are used for the coating film. When the water vapor in the air condenses on the surface of the coating film due to the temperature difference, the moisture generated by condensation is adsorbed in the coating film, so that dew on the surface is prevented from being generated, and the purpose of preventing dew is achieved. The paint generally requires a thickness of millimeter or even centimeter, has limited moisture absorption capacity, only singly reduces the environmental humidity, and does not solve the temperature difference problem, so that condensation can still occur under the condition of sufficiently large temperature difference, and cannot be used as a complete solution for preventing the condensation; 2. the low surface energy paint contains a large amount of fluorine-silicon elements in the formula of the paint, so that the surface energy of a cured paint film is low, and condensed water cannot stay on the surface of the paint film for a long time so as to slide off, thereby achieving the concept of 'anti-condensation', but the condensed water is generated in a large amount, and the problem caused by the condensed water is not solved.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, a preparation method and a construction process thereof, and the technical problems that the anti-condensation paint in the prior art is large in coating thickness, poor in coating moisture absorption effect and the generated condensation water cannot be eliminated fundamentally are solved.
The first aspect of the invention provides an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, which comprises the following components in parts by weight: 20-40 parts of silicone-acrylate emulsion, 1-5 parts of fumed silica, 30-50 parts of titanium dioxide, 10-30 parts of hollow glass beads, 1-5 parts of dispersing anti-settling agent, 1-5 parts of film forming auxiliary agent, 0.1-1 part of flash rust inhibitor, 1-5 parts of defoaming agent, 1-5 parts of leveling agent, 0.1-1 part of pH regulator and 1-20 parts of deionized water.
The second aspect of the invention provides a preparation method of an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, which comprises the following steps:
sequentially adding a film forming additive, an anti-flash rust inhibitor, a defoaming agent, a leveling agent, silicone-acrylate emulsion and the rest deionized water into the functional filler dispersion slurry, and uniformly stirring at a low speed to obtain the energy-saving emission-reducing heat-insulating anti-condensation water-based paint.
The third aspect of the invention provides a construction process of an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, which comprises the following steps:
the energy-saving emission-reducing heat-insulating anti-condensation water-based paint is coated on the surface of a substrate to be coated, and then the energy-saving emission-reducing heat-insulating anti-condensation water-based paint is formed on the surface of the substrate through maintenance.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the hollow glass beads with low heat conduction filler are adopted, so that the heat conduction coefficient of a paint film is reduced to 0.09 w/m.K, and the heat conduction can be effectively slowed down, thereby preventing abrupt occurrence of temperature difference; after the paint films containing hollow glass beads, titanium pigment and fumed silica with different particle diameters are solidified, the microscopic surfaces of the paint films are rough, compact stacked structures are formed under a scanning electron microscope, and the stacked structures can generate a plurality of fine pores, but the appearance of the paint films is smooth and flat, and small molecules (water vapor) in the environment can be adsorbed, so that the environment humidity is reduced; the two principles are synergistic, and the generation of condensation is fundamentally prevented, so that after the product is coated to reach the required film thickness, the anti-condensation effect can be achieved without any additional energy and manpower consumption, the construction is convenient, energy is saved, and emission is reduced.
Drawings
FIG. 1 is an SEM image of a paint film formed by curing the energy-saving emission-reducing heat-insulating anti-dewing water-based paint prepared in the embodiment 1 of the invention; wherein (b) is a partial enlarged view of (a).
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The first aspect of the invention provides an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, which comprises the following components in parts by weight: 20-40 parts of silicone-acrylate emulsion, 1-5 parts of fumed silica, 30-50 parts of titanium dioxide, 10-30 parts of hollow glass beads, 1-5 parts of dispersing anti-settling agent, 1-5 parts of film forming auxiliary agent, 0.1-1 part of flash rust inhibitor, 1-5 parts of defoaming agent, 1-5 parts of leveling agent, 0.1-1 part of pH regulator and 1-20 parts of deionized water.
In the invention, the silicone-acrylic emulsion is a single-component room-temperature curing silicone-acrylic emulsion, the solid content is more than or equal to 45%, and the silicon content is more than or equal to 10%. If the silicon content of the silicone-acrylic emulsion is less than 10%, the corrosion resistance and weather resistance of the silicone-acrylic emulsion are obviously reduced.
In the invention, the fumed silica is hydrophilic fumed silica, and the particle size is 5-300 nm; the titanium dioxide is zirconia coated rutile type titanium dioxide with the particle size of 300-400 um; the particle size of the hollow glass beads is less than or equal to 40um, and the compressive strength of the hollow glass beads is preferably more than 100MPa.
In some embodiments of the present invention, the fumed silica is type-M-5, the titanium dioxide is type-R-218 rutile titanium dioxide, shanghai Jianghai titanium dioxide chemical company, inc., and the hollow glass beads are type-3M iM16K.
In the invention, the dispersion anti-settling agent comprises a dispersion anti-settling agent 1 and a dispersion anti-settling agent 2; the dispersion anti-settling agent 1 is a block copolymer dispersing agent, the solvent is water, and the mass solid content is 30% -50%, and further 40%; the dispersion anti-settling agent 2 is a polymer dispersing agent of hydrophobically modified ammonium polyacrylate, the solvent is alkylbenzene, and the mass solid content is 90% -98%, and further 98%.
In some embodiments of the present invention, the type of the dispersing anti-settling agent 1 is DISPER BYK-190; the dispersion anti-settling agent 2 is star paint titanium white water paint dispersant PS-5040, dongguan city product water paint Limited company.
In the invention, the addition amount of the fumed silica, the titanium dioxide and the hollow glass beads is strictly controlled. If the content of the fumed silica is too high, the fumed silica dispersion liquid is a non-flowing pasty solid, and the rest powder materials cannot be uniformly dispersed; if the content of the fumed silica is too low, the fumed silica dispersion liquid is fluid with very low viscosity, and cannot have the thickening and anti-settling effects; if the content of the titanium dioxide is too high, the paint film is dropped after solidification and falls off in a piece; if the content of the titanium dioxide is too low, the covering power is insufficient, the paint film turns grey and yellow after solidification, and the formed microstructure has smaller porosity and the anti-condensation function is reduced; if the content of the hollow glass beads is too high, the surface of the paint film is provided with macroscopic beads after solidification, so that the surface of the paint film is uneven; if the content of the hollow glass beads is too low, the heat insulation effect will be poor. In the formula range of the invention, the coating with uniform dispersion and excellent anti-condensation performance can be obtained.
In the invention, under the action of proper addition amount and dispersing agent, the fillers with different particle diameters form a compact stacking structure in the paint film, and the fillers with different particle diameters form a plurality of tiny pores in the paint film, and the pores can absorb small molecules in air, such as water vapor, peculiar smell molecules and the like, so that the humidity is reduced.
Meanwhile, the inventor finds that the addition sequence of the fumed silica, the titanium dioxide and the hollow glass beads has great influence on the performances of the paint and the coating in the test process. If the dispersion anti-settling agent 1 and the dispersion anti-settling agent 2 are mixed and added, then the fumed silica, the titanium dioxide and the hollow glass beads are added, the rotating speed is controlled below 500r/min, the hollow glass beads are broken due to overlarge rotating speed, but the fumed silica is nanoscale, the adding amount of the titanium dioxide is large, the dispersing effect is poor, and even if the stirring time is long enough, the obtained dispersion liquid can be agglomerated visually. If the hollow glass beads are added first, as the dispersing agent specially aiming at the hollow glass beads is not contained in the formula, the dispersion is pure depending on the system viscosity and the slight action of the dispersing anti-settling agent 1, if the dispersing agent is added before the fumed silica, the hollow glass beads float on the surface in a large amount, and the beads are broken due to the overlarge stirring speed. If the paint film is easy to float and bloom after being solidified according to the dispersion sequence of titanium dioxide, fumed silica and hollow glass beads, the reason may be that the titanium dioxide is excessively added, and even if the dispersion anti-settling agent 2 is added, the system viscosity is not large enough, and the dispersion is uneven; if the dispersing order of the titanium dioxide, the hollow glass beads and the fumed silica is adopted, the hollow glass beads are stood for layering after dispersing.
In some preferred embodiments of the invention, the energy-saving emission-reducing heat-insulating anti-dewing water-based paint is prepared by uniformly dispersing fumed silica and a part of dispersing anti-settling agent 1 into a part of deionized water, then adding titanium dioxide and dispersing anti-settling agent 2, stirring to paste, then adding hollow glass beads and residual dispersing anti-settling agent 1 to form functional filler dispersion slurry, and finally adding the rest components and residual deionized water.
In the invention, the pH regulator can be added only in the process that the fumed silica and part of the dispersing anti-settling agent 1 are uniformly dispersed to part of deionized water, so that the pH value of the fumed silica dispersion liquid is regulated to 9.5-10.5, on one hand, the dispersibility and stability of the fumed silica in a system are ensured, and on the other hand, the whole coating is ensured to be in an alkaline state, and the coating is mildew-proof and antibacterial; the water-based paint can be continuously added in the process of preparing the energy-saving emission-reducing heat-insulating anti-condensation water-based paint by mixing the functional filler dispersion slurry, the rest components and the rest deionized water, and the pH of the paint system can be controlled to be 8-9.
In some embodiments of the present invention, the functional filler dispersion slurry is prepared by the steps of:
s1, taking part of deionized water, adding fumed silica into the part of deionized water, stirring at a low speed, adding part of dispersing anti-settling agent 1, stirring and dispersing until no obvious layering exists, adding pH regulator to adjust pH to 9.5-10.5, transferring to a sand mill, and continuing to disperse to finally obtain slightly viscous fumed silica dispersion; wherein, the addition amount of partial deionized water is 0.8-3 times of the mass of the fumed silica; the addition amount of the partial dispersion anti-settling agent 1 is 0.3-0.5% of the mass of the fumed silica; in the low-speed stirring process, the stirring speed is less than or equal to 500r/min, and after stirring for 10-20 min at low speed, part of the dispersing anti-settling agent 1 is added;
s2, adding titanium dioxide into the fumed silica dispersion liquid, stirring at a low speed until the fumed silica dispersion liquid has no massive agglomerated powder, adding the dispersion anti-settling agent 2, and stirring at a high speed to obtain pasty fumed silica+titanium dioxide dispersion liquid; wherein, the adding amount of the dispersion anti-settling agent 2 is 1-2% of the mass of the titanium dioxide; in the low-speed stirring process, the stirring speed is less than or equal to 500r/min; in the high-speed stirring process, the stirring speed is more than or equal to 2500r/min, and the stirring time is 30-60 min;
s3, adding hollow glass beads into the pasty fumed silica and titanium dioxide dispersion liquid, and adding the residual dispersion anti-settling agent 1 while slowly stirring until the dispersion is uniform, so as to obtain functional filler dispersion slurry; wherein, in the process of slow stirring, the stirring speed is less than or equal to 300r/min.
In the invention, flash rust on the polished substrate is prevented by adding the flash rust inhibitor. The invention is not limited in the types of the film forming auxiliary agent, the flash rust inhibitor, the antifoaming agent, the leveling agent and the pH regulator, and can be selected by a person skilled in the art according to actual conditions. For example, the coalescent may be a dodecanol ester coalescent, such as Issman texanol, USA, and the like; the anti-rust inhibitor can be an organic zinc chelate solution, such as Japanese patent No. AKN-0660; the defoamer can be aqueous organic silicon defoamer, such as BYK-024 of Pick chemical of Germany; the leveling agent can be dimethyl siloxane leveling agent, such as BYK-333 of Pick chemical of Germany; the pH regulator may be aminomethyl benzyl alcohol type pH regulator such as Dow chemical AMP-95.
The second aspect of the invention provides a preparation method of an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, which comprises the following steps:
sequentially adding a film forming additive, an anti-flash rust inhibitor, a defoaming agent, a leveling agent, silicone-acrylate emulsion and the rest deionized water into the functional filler dispersion slurry, and uniformly stirring at a low speed to obtain the energy-saving emission-reducing heat-insulating anti-condensation water-based paint. In the process, the stirring rotation speed is less than or equal to 500r/min.
The third aspect of the invention provides a construction process of an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, which comprises the following steps:
the energy-saving emission-reducing heat-insulating anti-condensation water-based paint is coated on the surface of a substrate to be coated, and then the energy-saving emission-reducing heat-insulating anti-condensation water-based paint is formed on the surface of the substrate through maintenance.
In the present invention, all surfaces to be coated should be clean, dry and free of contaminants. Before the substrate is coated, water-soluble dirt, oil, grease and rust are required to be removed, the oil and grease are required to be removed according to the cleaning standard of SSPC-SP1 solvent, if the surface of the substrate is corroded, the substrate is required to be cleaned to Sa21/2 (ISO 8501-1:2007) or SSPC-SP6 level by sand blasting or polishing, and the surface defects exposed by the sand blasting cleaning process are required to be polished, filled or treated in a proper manner. In the energy-saving emission-reducing heat-insulating anti-condensation water-based paint, the total amount of powder filler is more than 50%, and the content of resin emulsion is relatively low, so that in the pretreatment step, a substrate needs to be polished to Sa21/2 (ISO 8501-1:2007) or SSPC-SP6 level to increase the adhesive force, and if the substrate cannot be polished, a layer of double-component water-based epoxy primer needs to be coated first and then the product of the invention is coated. In some embodiments of the invention, the substrate is a metal.
The invention is not limited to the manner of coating and may be selected by those skilled in the art according to the actual circumstances. If the viscosity of the coating system is relatively high, a airless spraying mode is preferably adopted, and at the moment, the energy-saving emission-reducing heat-insulating anti-condensation water-based coating prepared by the invention is pasty fluid, the spraying pressure is relatively high, and other spraying modes can not spray the product of the invention, so that certain requirements (more than 100 MPa) are also provided for the compressive strength of the hollow glass microspheres.
In some specific embodiments of the invention, the airless spraying mode is adopted, the spraying times are more than or equal to 2 times, the construction environment temperature is 5-40 ℃, the relative humidity is less than or equal to 85%, the nozzle size is 0.38-0.53 mm, the spraying pressure is 2000-2500 psi, and the dilution ratio is that deionized water is added to 0-10% (volume ratio).
In the invention, the curing conditions are as follows: the surface is dried for 2 to 4 hours at the temperature of 20 to 30 ℃ and further at the temperature of 25 ℃ and the relative humidity of less than or equal to 85 percent, and the surface is actually and completely dried for 48 hours and can be put into use.
In the present invention, in order to obtain good performance, the total film thickness is required to be 100 μm or more, preferably 100 to 150. Mu.m. The film thickness is too large, which is unfavorable for reducing the cost.
Example 1
The embodiment provides a preparation method of an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, which comprises the following steps:
(1) Taking part of deionized water according to parts by weight, adding fumed silica (particle size of 5-300 nm) into the part of deionized water, stirring at a low speed (500 r/min) for 10min, adding part of dispersing anti-settling agent 1 (DISPER BYK-190), stirring and dispersing until no obvious layering exists, adjusting pH to 10, transferring to a sand mill for further dispersing, and obtaining slightly viscous fumed silica dispersion after 30 min.
(2) Adding titanium dioxide (particle size 300-400 um) into the fumed silica dispersion, stirring at a low speed (500 r/min) until no large agglomerated powder exists, adding a dispersing anti-settling agent 2 (star paint Tian titanium dioxide water paint dispersing agent PS-5040, dongguan city product water-based paint Co., ltd.) and stirring at a high speed (2500 r/min) for 30min to obtain pasty fumed silica+titanium dioxide dispersion.
(3) Adding hollow glass beads (particle size less than or equal to 40 um) into the pasty fumed silica+titanium dioxide dispersion liquid, and adding the rest of the dispersion anti-settling agent 1 (DISPER BYK-190) while slowly stirring (300 r/min) until the dispersion is uniform, thereby obtaining the functional filler dispersion slurry.
(4) And finally, sequentially adding the rest components in the formula into the functional filler dispersion slurry according to the formula of the table 1, wherein the silicone-acrylic emulsion (the silicon content is 22 percent, the solid content is 50 percent) and the rest deionized water are finally added, and stirring uniformly to obtain the energy-saving emission-reducing heat-insulating anti-condensation water-based paint. In the process, the stirring rotation speed is always less than or equal to 500r/min.
The embodiment also provides a construction process of the energy-saving emission-reducing heat-insulating anti-condensation water-based paint, which comprises the following steps:
pretreatment of a base material: the base material is tin-plated tinplate, 1000-mesh sand paper is used for polishing to Sa21/2 (ISO 8501-1:2007) grade, and ethanol and clear water are used for wiping the polished surface, so that the surface to be coated is ensured to be clean, dry and free of pollutants.
Spraying conditions: two airless sprays were applied at room temperature of 25 c, a relative humidity of 70%, a nozzle size of 0.45mm, a spray pressure of 2100psi, and a dilution ratio of 7% deionized water (volume ratio).
Curing conditions: when the temperature is 25 ℃ and the relative humidity is 65%, the surface is dried for 2.5 hours, and the surface is actually and completely dried for 48 hours, so that the product can be put into use.
Test results: the airless spraying is adopted for two times, the film thickness of the first layer is about 35um, the total film thickness of the paint with the same quality is about 100um for two times under the same spraying condition, and the paint surface is flat and smooth. The heat conductivity coefficient is 0.09 w/m.K, the heat insulation temperature difference is 37.6 ℃, under the condition of the test state II (the temperature is 25 ℃, the relative humidity is 95%, the temperature of the circulating water bath is 5 ℃), the initial dew point is 67min, the condensation amount is 2.05g, the neutral salt fog resistance is 1000h without abnormality (GB/T1771), and the artificial climate aging resistance is 2500h without abnormality (GB/T1865).
Examples 2 to 3
Examples 2 to 3 differ from example 1 only in the amount of raw materials added, and the details are shown in Table 1.
TABLE 1 amounts of different raw materials to be added in examples 1 to 3 and comparative examples 3 to 4
Note that: in table 1 "+" indicates that the dispersion anti-settling agent 1 is added in two portions, for example, "0.01+2.49", the first amount is 0.01 part, the second amount is 2.49 parts, and "2+3" indicates that the deionized water is added in two portions, the first amount is 2 parts, the second amount is 3 parts, and so on.
Comparative example 1
Compared with example 1, the only difference is that: the particle sizes of the hollow glass beads, the rutile type titanium dioxide and the silicon dioxide in the comparative example 1 are all about 40 microns, and the difference is not large. The same construction process and test method are adopted.
Test results: the airless spraying is adopted for two times, the film thickness of the first layer is about 35um, the total film thickness of the paint with the same quality is about 70 microns for two times under the same spraying condition, the paint surface is uneven, and the paint surface is roughened. Under the condition of the test state II (the temperature is 25 ℃, the relative humidity is 95 percent, the temperature of the circulating water bath is 5 ℃), the initial dew point is 14 minutes, the dew condensation amount is 3.05g, the neutral salt fog resistance is 720h without abnormality (GB/T1771), and the artificial climate aging resistance is 2000h without abnormality (GB/T1865).
Comparative example 2
Compared with example 1, the only difference is that: the silicon content of the selected silicone-acrylic emulsion is 7.8 percent (less than 10 percent). The same construction process and test method are adopted.
Test results: the coating prepared in comparative example 2 has the condensation resistance which is not quite different from that of example 1, but has no abnormality (GB/T1771) in neutral salt spray resistance of 400h and has no abnormality (GB/T1865) in artificial weather aging resistance of 1400 h.
Comparative example 3
Compared with example 1, the only difference is that: the titanium dioxide content is 27 parts, and is shown in table 1. The same construction process and test method are adopted.
Test results: the coating has reduced covering power, heat conductivity coefficient of 0.16 w/m.K, heat insulation temperature difference of 29.6 ℃, and dew condensation amount of 3.01g under the condition of testing state II (temperature of 25 ℃, relative humidity of 95%, circulating water bath temperature of 5 ℃), initial dew point of 55 min.
Comparative example 4
Compared with example 1, the only difference is that: the hollow glass beads were 9.7 parts and are shown in Table 1. The same construction process and test method are adopted.
Test results: the heat conductivity coefficient is 0.31 w/m.K, the heat insulation temperature difference is 18.6 ℃, and under the condition of testing state II (the temperature is 25 ℃, the relative humidity is 95%, the temperature of a circulating water bath is 5 ℃), the initial dew point is 12min, and the dew condensation amount is 4.01g.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) The invention reduces the environmental humidity through adsorption and slows down the temperature difference between the inside and outside through heat insulation, and the two cooperate to increase the efficiency, and starts from the basic principle of dew formation, thus the product of the invention can achieve the effect of dew formation without any additional energy and manpower consumption after reaching the required film thickness, and the invention has convenient construction, energy conservation and emission reduction.
(2) After the paint is cured, the thickness of a paint film rises sharply along with the application times, namely, along with the increase of the application times, the thickness of the paint film is 35um in the first pass when the paint film is applied due to irregular pores generated by a tightly stacked structure, the paint film with the same quality is sprayed under the same condition, and the thickness of Tu Zong film is about 100um when the paint film is applied twice, so that the product can save the consumption of the paint film and does not influence the performance of the paint film if the specified film thickness is reached.
(3) After being coated to the film thickness of 100um according to the construction process, the heat conduction coefficient can be reduced to 0.09 w/m.K according to the test of GBT 25261-2018 reflective heat insulation coating for buildings, the heat insulation temperature difference is 37.6 ℃, and the heat insulation effect is obvious. According to the anti-dewing performance test method of HGT 4560-2013 paint, under the condition of test state II (temperature 25 ℃, relative humidity 95%, circulating water bath temperature 5 ℃), initial dew point 67min, dewing amount 2.05g and anti-dewing effect are obvious.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (7)
1. The energy-saving emission-reducing heat-insulating anti-condensation water-based paint is characterized by comprising the following components in parts by weight: 20-40 parts of silicone-acrylate emulsion, 1-5 parts of fumed silica, 30-50 parts of titanium dioxide, 10-30 parts of hollow glass beads, 1-5 parts of dispersing anti-settling agent, 1-5 parts of film forming auxiliary agent, 0.1-1 part of anti-flash rust inhibitor, 1-5 parts of defoaming agent, 1-5 parts of leveling agent, 0.1-1 part of pH regulator and 1-20 parts of deionized water; wherein the fumed silica is hydrophilic fumed silica, and the particle size is 5-300 nm; the titanium dioxide is zirconia coated rutile type titanium dioxide, and the particle size is 300-400; the particle size of the hollow glass beads is less than or equal to 40 mu m, and the compressive strength of the hollow glass beads is more than 100MPa; the dispersion anti-settling agent comprises a dispersion anti-settling agent 1 and a dispersion anti-settling agent 2; the dispersing anti-settling agent 1 is a block copolymer dispersing agent, the solvent is water, and the mass solid content is 30% -50%; the dispersion anti-settling agent 2 is a polymer dispersing agent of hydrophobically modified ammonium polyacrylate, the solvent is alkylbenzene, and the mass solid content is 90% -98%; the energy-saving emission-reducing heat-insulating anti-dewing water-based paint is prepared by uniformly dispersing fumed silica and a part of dispersing anti-settling agent 1 into a part of deionized water, then adding titanium dioxide and dispersing anti-settling agent 2, stirring to paste, then adding hollow glass beads and the rest of dispersing anti-settling agent 1 to form functional filler dispersion slurry, and finally adding the rest of components and the rest of deionized water.
2. The energy-saving emission-reducing heat-insulating anti-condensation water-based paint according to claim 1, wherein the addition amount of the partial deionized water is 0.8-3 times of the mass of the fumed silica; the addition amount of the partial dispersion anti-settling agent 1 is 0.3% -0.5% of the mass of the fumed silica; the addition amount of the dispersion anti-settling agent 2 is 1-2% of the mass of the titanium dioxide.
3. The energy-saving emission-reducing heat-insulating anti-condensation water-based paint according to claim 1, wherein the functional filler dispersion slurry is prepared by the following steps:
adding part of deionized water into the part of deionized water, adding part of dispersing anti-settling agent 1 after stirring at a low speed, adding pH regulator to adjust pH to 9.5-10.5 when stirring and dispersing until no obvious layering exists, transferring to a sand mill, and continuing to disperse to finally obtain slightly viscous fumed silica dispersion; in the low-speed stirring process, the stirring speed is less than or equal to 500r/min, and after stirring at a low speed for 10-20 min, part of the dispersing anti-settling agent 1 is added;
adding titanium dioxide into the fumed silica dispersion liquid, stirring at a low speed until the fumed silica dispersion liquid has no large agglomerated powder, adding the dispersing anti-settling agent 2, and stirring at a high speed to obtain pasty fumed silica+titanium dioxide dispersion liquid; wherein, in the process of low-speed stirring, the stirring speed is less than or equal to 500r/min; in the high-speed stirring process, the stirring speed is more than or equal to 2500r/min, and the stirring time is 30-60 min;
adding hollow glass beads into the pasty fumed silica+titanium dioxide dispersion liquid, and adding the rest dispersing anti-settling agent 1 while slowly stirring until the dispersion is uniform to obtain functional filler dispersion slurry; wherein, in the process of slow stirring, the stirring speed is less than or equal to 300r/min.
4. The energy-saving emission-reducing heat-insulating anti-dewing water-based paint according to claim 1, wherein the silicone-acrylic emulsion is a single-component room-temperature curing silicone-acrylic emulsion, the solid content is more than or equal to 45%, and the silicon content is more than or equal to 10%; the film forming auxiliary agent is a dodecanol ester film forming auxiliary agent; the anti-flash rust inhibitor is an organic zinc chelate solution; the defoaming agent is an aqueous organic silicon defoaming agent; the leveling agent is dimethyl siloxane leveling agent; the pH regulator is aminomethyl benzyl alcohol type pH regulator.
5. The preparation method of the energy-saving emission-reducing heat-insulating anti-condensation water-based paint as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
sequentially adding a film forming additive, an anti-flash rust inhibitor, a defoaming agent, a leveling agent, silicone-acrylate emulsion and the rest deionized water into the functional filler dispersion slurry, and uniformly stirring at a low speed to obtain the energy-saving emission-reducing heat-insulating anti-condensation water-based paint.
6. The construction process of the energy-saving emission-reducing heat-insulating anti-condensation water-based paint according to any one of claims 1 to 4, which is characterized by comprising the following steps:
the energy-saving emission-reducing heat-insulating anti-condensation water-based paint is coated on the surface of a substrate to be coated, and then the energy-saving emission-reducing heat-insulating anti-condensation water-based paint is formed on the surface of the substrate through maintenance.
7. The construction process of the energy-saving emission-reducing heat-insulating anti-condensation water-based paint according to claim 6, wherein the coating conditions are as follows: adopting an airless spraying mode, wherein the spraying frequency is more than or equal to 2 times, the construction environment temperature is 5-40 ℃, the relative humidity is less than or equal to 85%, the nozzle size is 0.38-0.53 mm, the spraying pressure is 2000-2500 psi, and the dilution ratio is that deionized water is added to 0-10 vol%;
the curing conditions are as follows: and when the temperature is 20-30 ℃ and the relative humidity is less than or equal to 85%, surface drying is carried out for 2-4 hours, and the surface is actually and completely dried for 48 hours.
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