CN115353787A

CN115353787A - Energy-saving emission-reducing heat-insulating anti-condensation water-based paint and preparation method and construction process thereof

Info

Publication number: CN115353787A
Application number: CN202211136336.1A
Authority: CN
Inventors: 李波涛; 龙梦捷; 李文品
Original assignee: Wuhan Doge Technology Development Co ltd
Current assignee: Wuhan Doge Technology Development Co ltd
Priority date: 2022-09-19
Filing date: 2022-09-19
Publication date: 2022-11-18
Anticipated expiration: 2042-09-19
Also published as: CN115353787B

Abstract

The invention discloses an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, and a preparation method and a construction process thereof. The coating comprises the following components: silicone-acrylate emulsion, fumed silica, titanium dioxide, hollow glass beads, a dispersion anti-settling agent, a film forming aid, an anti-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, so that the heat conduction can be effectively slowed down, and the sudden occurrence of temperature difference can be prevented; the microscopic surface of a paint film is rough, a plurality of small pores can be generated, and small molecules in the environment can be adsorbed, so that the environmental humidity is reduced; the two principles are synergistic, the generation of condensation is fundamentally prevented, after the product coated with the anti-condensation paint disclosed by the invention reaches the required film thickness, the anti-condensation effect can be achieved without any other additional energy and manpower consumption, the construction is convenient, and the energy is saved and the emission is reduced.

Description

Energy-saving emission-reducing heat-insulating anti-condensation water-based paint and preparation method and construction process thereof

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 and a preparation method and a construction process thereof.

Background

The dew condensation generally refers to the phenomenon that when the temperature difference between day and night is large and the humidity is high in autumn and winter or plum rain season, when the structure temperature of outdoor facilities such as buildings and outdoor electric cabinets is lower than the dew point temperature of the air in the outdoor facilities, water vapor is generated on the inner surface of the outdoor facilities and condenses to form water drops. Condensation can cause serious consequences or great harm: (1) When dew condensation is generated in a building, dew condensation water pollutes the surface of the inner side of a living room and articles and the like stored in the room, and can cause mildew and accelerate the damage of building materials, and particularly for industrial buildings, the dew condensation water not only has great influence on a factory building structure and operators in the factory building, but also can cause corrosion, mildew and the like of a produced product, so that the product quality is reduced, and bad results are caused; (2) For outdoor electric cabinets or computer rooms, precision instruments, instrument rooms and the like with circuits (boards), if dew drops, the problem becomes more serious, and even serious accidents such as operation failure, test disorder, line damage and the like can be caused.

At present, the interior dewing of outdoor buildings is generally carried out through a dehumidification mode, for example, a dehumidifier, an air conditioner and an adsorptive dehumidification material (such as a dehumidification bag and diatomite paint) are carried out, not only electric energy is consumed or the dehumidification material (the dehumidification bag) needs to be replaced regularly, but also the effect is general, especially, the underground building part is easy to have dewing and mould at the positions of an inner wall surface, a ground surface and the like, besides, the similar diatomite paint dewing prevention products with an adsorption function are mostly required to be thick (such as a centimeter level), and the effect of adsorbing moisture in the environment is better. And outdoor electricity cabinet etc. use ventilating fan, air conditioner etc. usually, and the principle reduces the humidity and the inside and outside difference in temperature of the internal portion of cabinet to prevent the production of dewing, but at the rare extremely switch board of people, signal tower distribution room, then need regularly artifical whether normal work of air conditioner, air discharge fan, whether have the appearance of dewing, consuming time power.

If the coating material having the anti-condensation function is used, the coating material can be roughly classified into two types: 1. the coating product with adsorption function by adding porous filler is generally composed of resin, porous material, stabilizer, auxiliary agent, water and other pigment and filler. Has several characteristics: one is to have a certain thickness (hygroscopic volume); secondly, the coating film is porous, and communicated pores are formed in the coating film and can accommodate condensed water adsorbed on the surface; thirdly, materials such as super absorbent resin and diatomite are used in the coating film. Thus, when water vapor in the air is condensed on the surface of the coating film due to temperature difference, moisture generated by condensation is absorbed in the coating film, and dew on the surface is prevented from appearing, so that the aim of preventing dew condensation is fulfilled. The coating generally requires the thickness of millimeter or even centimeter grade, has limited moisture absorption capacity, only reduces the environmental humidity singly, and does not solve the problem of temperature difference, so when the temperature difference is large enough, condensation still occurs, and the coating cannot be used as a complete solution for preventing condensation; 2. the low-surface-energy coating contains a large amount of fluorine and silicon elements in the formula, so that the surface energy of a cured paint film is low, and therefore, condensed water cannot stay on the surface of the paint film for a long time and then slides off, so that the concept of 'condensation prevention' is achieved.

Disclosure of Invention

The invention aims to overcome the technical defects, provides an energy-saving emission-reducing heat-insulating anti-condensation water-based paint, and a preparation method and a construction process thereof, and solves the technical problems that the anti-condensation paint in the prior art is large in coating thickness, poor in coating moisture absorption effect and incapable of fundamentally eliminating generated condensation water.

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 to 40 portions of silicone-acrylic emulsion, 1 to 5 portions of fumed silica, 30 to 50 portions of titanium dioxide, 10 to 30 portions of hollow glass beads, 1 to 5 portions of dispersion anti-settling agent, 1 to 5 portions of film forming additive, 0.1 to 1 portion of flash rust inhibitor, 1 to 5 portions of defoaming agent, 1 to 5 portions of flatting agent, 0.1 to 1 portion of pH regulator and 1 to 20 portions 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:

and sequentially adding the film forming auxiliary agent, the flash rust inhibitor, the defoaming agent, the flatting agent, the silicone-acrylic emulsion and the residual deionized water into the functional filler dispersed slurry, and uniformly stirring at a low speed to obtain the energy-saving emission-reducing heat-insulating dewing-proof 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 coating is coated on the surface of a base material to be coated, and then the energy-saving emission-reducing heat-insulating anti-condensation water-based coating is formed on the surface of the base material 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 fillers 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 the sudden occurrence of temperature difference; after a paint film containing hollow glass beads, titanium dioxide and fumed silica with different particle sizes is cured, the microscopic surface of the paint film is rough, a compact stacking structure is formed under a scanning electron microscope, the stacking structure can generate a plurality of small pores, but the paint film is flat and smooth in appearance and can adsorb small molecules (water vapor) in the environment, 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 coated with the anti-condensation paint disclosed by the invention reaches the required film thickness, the anti-condensation effect can be achieved without any other additional energy and manpower consumption, the construction is convenient, and the energy is saved and the emission is reduced.

Drawings

FIG. 1 is an SEM image of a paint film formed by curing an energy-saving emission-reducing heat-insulating anti-condensation water-based paint prepared in example 1 of the invention; wherein (b) is a partially enlarged view of (a).

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the invention, the silicone-acrylate emulsion is a single-component room temperature curing silicone-acrylate emulsion, the solid content is more than or equal to 45 percent, and the silicon content is more than or equal to 10 percent. The silicone-acrylate emulsion is used as a main film forming material in a system, and if the silicon content of the silicone-acrylate emulsion is less than 10%, the corrosion resistance and the weather resistance are obviously reduced.

In the invention, the fumed silica is hydrophilic fumed silica with the particle size of 5-300 nm; the titanium dioxide is zirconia coated rutile titanium dioxide with the particle size of 300-400 um; the particle size of the hollow glass bead is less than or equal to 40um, and the compressive strength of the hollow glass bead is preferably more than 100MPa.

In some embodiments of the present invention, the fumed silica is of type Kabot M-5, the titanium pigment is R-218 rutile titanium pigment, shanghai Hu titanium white chemical Co., ltd, and the hollow glass microspheres are of type U.S. 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 dispersant, the solvent is water, and the mass solid content is 30-50 percent, and further 40 percent; the dispersion anti-settling agent 2 is a polymer dispersant of hydrophobic modified polyacrylic acid ammonium salt, 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 dispersion anti-settling agent 1 is DISPER BYK-190; the dispersing anti-settling agent 2 is star paint titanium pigment water-based paint dispersing agent PS-5040, which is a product of Dongguan Shangshen water-based paint company Limited.

In the invention, the addition of fumed silica, titanium dioxide and hollow glass beads needs to be strictly controlled. If the content of the fumed silica is too high, the fumed silica dispersion is a non-flowing pasty solid, and other powder materials cannot be uniformly dispersed; if the content of the fumed silica is too low, the fumed silica dispersion is a fluid with low viscosity, and cannot achieve the thickening and anti-settling effects; if the content of the titanium dioxide is too high, the paint film is broken off and flaky after being solidified; if the content of the titanium dioxide is too low, the covering power is insufficient, a paint film turns grey and yellow after being cured, the porosity of a formed microstructure is reduced, and the anti-condensation function is reduced; if the content of the hollow glass microspheres is too high, macroscopic microspheres exist on the surface of a paint film after the paint film is solidified, 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 is poor. Within 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 a proper addition amount and a dispersing agent, the fillers with different particle sizes form a compact stacked structure in a paint film, and the compact stacking of the fillers with different particle sizes in the paint film can form a plurality of fine pores which can adsorb small molecules in the air, such as water vapor, peculiar smell molecules and the like, thereby reducing the humidity.

Meanwhile, the inventor finds that the adding sequence of the fumed silica, the titanium dioxide and the hollow glass beads has great influence on the performance of the coating 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, and then the fumed silica, the titanium dioxide and the hollow glass beads are added, the rotating speed must be controlled below 500r/min, the hollow glass beads are broken due to overlarge rotating speed, but the fumed silica is nano-scale, the adding amount of the titanium dioxide is large, the dispersion effect is poor, and the obtained dispersion liquid can be agglomerated by naked eyes even if the stirring time is long enough. If the hollow glass microspheres are added firstly, because the formula does not have a dispersing agent specially aiming at the hollow glass microspheres, the dispersion is only dependent on the slight action of the system viscosity and the dispersion anti-settling agent 1, if the hollow glass microspheres are added before the fumed silica, the hollow glass microspheres can float on the surface in a large amount, and the microspheres can be broken due to the overlarge stirring speed. If the paint film is easy to float and bloom after being cured according to the dispersion sequence of the titanium dioxide, the fumed silica and the hollow glass beads, the reason may be that the titanium dioxide is added in an excessive amount, and even if the dispersion anti-settling agent 2 is added, the viscosity of the system is not high enough, and the dispersion is not uniform; if the hollow glass beads are dispersed and then stand for layering according to the dispersion sequence of the titanium dioxide, the hollow glass beads and the fumed silica.

In some preferred embodiments of the invention, the energy-saving emission-reducing heat-insulating anti-condensation 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 a dispersing anti-settling agent 2, stirring into a paste, then adding hollow glass beads and the rest of dispersing anti-settling agent 1 to form functional filler dispersing slurry, and finally adding the rest of components and the rest of deionized water.

In the invention, the pH regulator can be added only in the process of uniformly dispersing the fumed silica and the partial dispersion anti-settling agent 1 into partial deionized water so as to regulate the pH of the fumed silica dispersion to 9.5-10.5, thereby ensuring the dispersibility and stability of the fumed silica in a system on one hand and ensuring the whole coating to be in an alkaline state, and being mildewproof and bacteriostatic on the other hand; the functional filler dispersion slurry can also be continuously added in the process of preparing the energy-saving emission-reducing heat-insulating anti-condensation water-based paint by mixing with the rest of components and the rest of deionized water, the invention does not limit the process, and the pH value 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 following steps:

s1, taking part of deionized water, adding fumed silica into part of the deionized water, stirring at a low speed, adding part of dispersion anti-settling agent 1, stirring and dispersing until no obvious layering exists, adding a pH regulator to regulate the pH value to 9.5-10.5, and then transferring to a sand mill for continuous dispersion to finally obtain a slightly viscous fumed silica dispersion; wherein the addition amount of partial deionized water is 0.8 to 3 times of the mass of the fumed silica; the adding amount of the partial dispersion anti-settling agent 1 is 0.3 to 0.5 percent of the mass of the fumed silica; in the process of low-speed stirring, the stirring speed is less than or equal to 500r/min, and after 10-20 min of low-speed stirring, part of the dispersion anti-settling agent 1 is added;

s2, adding titanium dioxide into the fumed silica dispersion, stirring at a low speed until no large agglomerated powder exists, adding the dispersion anti-settling agent 2, and stirring at a high speed to obtain paste fumed silica + titanium dioxide dispersion; wherein, the addition amount of the dispersing anti-settling agent 2 is 1-2% of the mass of the titanium dioxide; in the process of low-speed stirring, the stirring speed is less than or equal to 500r/min; in the process of high-speed stirring, 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 paste-shaped fumed silica and titanium dioxide dispersion liquid, and supplementing and adding the rest of the 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 present invention, flash rust on the polished substrate is prevented by adding a flash rust inhibitor. The invention does not limit the types of the film forming assistant, the flash rust inhibitor, the defoaming agent, the leveling agent and the pH regulator, and the skilled person can select the film forming assistant, the flash rust inhibitor, the defoaming agent, the leveling agent and the pH regulator according to actual conditions. For example, the coalescent may be a dodecanol ester-based coalescent, such as eastman texanol, et al; the anti-flash rust inhibitor can be organic zinc chelate solution, such as Benteuqian AKN-0660; the defoaming agent can be water-based silicone defoaming agent, such as BYK-024 in Germany Bike chemical; the leveling agent can be dimethyl siloxane leveling agent, such as Germany Bick chemical BYK-333; the pH regulator can be aminomethyl benzyl alcohol, such as Dow chemical AMP-95.

and sequentially adding the film forming auxiliary agent, the flash rust inhibitor, the defoaming agent, the flatting agent, the silicone-acrylic emulsion and the residual deionized water into the functional filler dispersed slurry, and uniformly stirring at a low speed to obtain the energy-saving emission-reducing heat-insulating dewing-proof water-based paint. In the process, the stirring speed is less than or equal to 500r/min.

In the present invention, all surfaces to be coated should be clean, dry and contaminant free. Before coating the substrate, water-soluble dirt, oil, grease and rust are removed, the oil and the grease are removed according to SSPC-SP1 solvent cleaning standards, if the surface of the substrate has rust, the substrate is cleaned to Sa21/2 (ISO 8501-1. 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, the base material needs to be polished to Sa21/2 (ISO 8501-1 2007) or SSPC-SP6 level to increase the adhesive force, and if the base material cannot be polished, a layer of two-component water-based epoxy primer needs to be coated first, and then the product disclosed by the invention is coated. In some embodiments of the invention, the substrate is a metal.

The coating mode is not limited by the invention, and the skilled person can select the coating mode according to the actual situation. If the viscosity of the coating system is relatively high, an airless spraying mode is preferably adopted, at the moment, the energy-saving emission-reducing heat-insulating anti-condensation water-based coating prepared by the invention is a paste fluid, the spraying pressure is relatively high, and other spraying modes can not spray the product, so that the compressive strength of the hollow glass beads is required to be higher than 100MPa.

In some embodiments of the invention, an airless spraying mode is adopted, the spraying frequency is more than or equal to 2 times, the temperature of the construction environment is 5-40 ℃, the relative humidity is less than or equal to 85%, the size of the nozzle is 0.38-0.53 mm, the spraying pressure is 2000-2500 psi, and the dilution ratio is 0-10% (volume ratio) of deionized water.

In the invention, the curing conditions are as follows: the surface is dried for 2 to 4 hours at the temperature of between 20 and 30 ℃, further 25 ℃ and when the relative humidity is 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, the total film thickness is required to be 100 μm or more, preferably 100 to 150 μm, in order to obtain good performance. The film thickness is too large, which is not beneficial to 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) According to the weight portion, taking part of deionized water, adding fumed silica (with the particle size of 5-300 nm) into part of the 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 the pH value to 10, then transferring to a sand mill for further dispersion, and obtaining slightly viscous fumed silica dispersion after 30 min.

(2) Adding titanium dioxide (the particle size is 300-400 um) into the fumed silica dispersion, stirring at low speed (500 r/min) until no large agglomerated powder exists, adding a dispersion anti-settling agent 2 (star paint titanium dioxide water-based paint dispersing agent PS-5040, dongguan market Shangshen water-based paint Co., ltd.), and stirring at high speed (2500 r/min) for 30min to obtain paste fumed silica + titanium dioxide dispersion.

(3) Adding hollow glass beads (the particle size is less than or equal to 40 um) into the paste fumed silica + titanium dioxide dispersion, slowly stirring (300 r/min) while supplementing and adding the rest dispersion anti-settling agent 1 (DISPER BYK-190) to a uniformly dispersed state, and obtaining the functional filler dispersion slurry.

(4) And finally, sequentially adding the rest components in the formula into the functional filler dispersed slurry according to the formula shown in the table 1, and finally adding the silicone-acrylic emulsion (the silicon content is 22 percent and the solid content is 50 percent) and the rest deionized water, and uniformly stirring to obtain the energy-saving emission-reducing heat-insulating anti-condensation water-based paint. In the process, the stirring 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, the base material is polished to Sa21/2 (ISO 8501-1.

Spraying conditions are as follows: the two spraying steps are carried out in an airless manner, the room temperature is 25 ℃, the relative humidity is 70%, the nozzle size is 0.45mm, the spraying pressure is 2100psi, and the dilution ratio is 7 percent by volume of deionized water.

And (3) maintenance conditions: the surface is dried for 2.5h and the actual and complete drying is carried out for 48h at the temperature of 25 ℃ and the relative humidity of 65 percent, and the product can be put into use.

And (3) testing results: the method adopts two airless spraying steps, the thickness of the first layer is about 35 mu m, the total film thickness of the coating with the same quality is about 100 mu m twice 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 ℃, and the initial dew point is 67min under the condition of a test state II (the temperature is 25 ℃, the relative humidity is 95%, the temperature of a circulating water bath is 5 ℃), the dew condensation amount is 2.05g, the neutral salt spray resistance is no abnormity for 1000h (GB/T1771), and the artificial weathering resistance is no abnormity for 2500h (GB/T1865).

Examples 2 to 3

Examples 2 to 3 differ from example 1 only in the amount of the raw materials added, and are specifically shown in table 1.

TABLE 1 charging amounts of different raw materials in examples 1 to 3 and comparative examples 3 to 4

Note: in Table 1, "+" indicates multiple additions, for example, "0.01+2.49" indicates that the dispersion anti-settling agent 1 is added in two times, the first addition is 0.01 parts, the second addition is 2.49 parts, "2+3" indicates that the deionized water is added in two times, the first addition is 2 parts, the second addition is 3 parts, and so on.

Comparative example 1

Compared with example 1, the difference is only that: the particle sizes of the hollow glass microspheres, rutile type titanium dioxide and 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.

And (3) testing results: the method adopts two times of airless spraying, the thickness of the first layer film is about 35um, the total film thickness of the coating with the same quality is about 70 microns twice under the same spraying condition, and the coating surface is uneven and rough to touch. Under the condition of a test 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 14min, the dew condensation amount is 3.05g, the neutral salt spray resistance is not abnormal for 720h (GB/T1771), and the artificial weathering resistance is not abnormal for 2000h (GB/T1865).

Comparative example 2

Compared with example 1, the difference is only that: the silicon content in the selected silicone-acrylic emulsion is 7.8 percent (less than 10 percent). The same construction process and test method are adopted.

And (3) testing results: the anti-condensation performance of the coating prepared in the comparative example 2 is not much different from that of the coating prepared in the example 1, but the neutral salt spray resistance is not abnormal after 400 hours (GB/T1771), and the artificial weathering resistance is not abnormal after 1400 hours (GB/T1865).

Comparative example 3

Compared with example 1, the only difference is that: the content of the titanium dioxide is 27 parts, and the specific content is shown in Table 1. The same construction process and test method are adopted.

And (3) testing results: the covering power of the coating is reduced, the heat conductivity coefficient is 0.16 w/m.K, the heat insulation temperature difference is 29.6 ℃, the initial dew point is 55min, and the dew condensation amount is 3.01g under the conditions of a test state II (the temperature is 25 ℃, the relative humidity is 95%, and the circulating water bath temperature is 5 ℃).

Comparative example 4

Compared with example 1, the only difference is that: the content of the hollow glass beads is 9.7 parts, and the concrete contents are shown in table 1. The same construction process and test method are adopted.

And (3) testing results: the heat conductivity coefficient is 0.31 w/m.K, the heat insulation temperature difference is 18.6 ℃, the initial dew point is 12min and the dew condensation amount is 4.01g under the conditions of a test state II (the temperature is 25 ℃, the relative humidity is 95 percent and the temperature of a circulating water bath is 5 ℃).

In summary, compared with the prior art, the invention has the following beneficial effects:

(1) According to the invention, the environment humidity is reduced through the adsorption effect, the internal and external temperature difference is slowed down through the heat insulation effect, the two effects are synergistic, the generation of condensation is prevented starting from the fundamental principle of condensation generation, and therefore, after the product coated with the moisture-proof coating disclosed by the invention reaches the required film thickness, the moisture-proof effect can be achieved without any other additional energy and manpower consumption, the construction is convenient, and the energy conservation and emission reduction are realized.

(2) After the coating is cured, the thickness of a paint film is increased along with the application times, namely, along with the increase of the application times, due to irregular pores generated by a tightly stacked structure, if the thickness of the first applied film is 35 mu m, the coating with the same quality is sprayed under the same condition, and the total film thickness of the two applied films is about 100 mu m, which means that the product can save the using amount of the coating if the specified film thickness is achieved, and the performance of the coating is not influenced.

(3) After the coating is coated to the thickness of 100 mu m according to the construction process, the thermal conductivity can be reduced to 0.09 w/m.K according to the test of GBT 25261-2018 reflective insulation coating for buildings, the thermal insulation temperature difference is 37.6 ℃, and the thermal insulation effect is obvious. According to the test method for the anti-condensation performance of the HGT 4560-2013 coating, under the condition of a test state II (the temperature is 25 ℃, the relative humidity is 95%, and the circulating water bath temperature is 5 ℃), the initial dew point is 67min, the condensation amount is 2.05g, and the anti-condensation effect is obvious.

The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An energy-saving emission-reducing heat-insulating anti-condensation water-based paint is characterized by comprising the following components in parts by weight: 20 to 40 portions of silicone-acrylic emulsion, 1 to 5 portions of fumed silica, 30 to 50 portions of titanium dioxide, 10 to 30 portions of hollow glass beads, 1 to 5 portions of dispersion anti-settling agent, 1 to 5 portions of film forming additive, 0.1 to 1 portion of flash rust inhibitor, 1 to 5 portions of defoaming agent, 1 to 5 portions of flatting agent, 0.1 to 1 portion of pH regulator and 1 to 20 portions of deionized water.

2. The energy-saving emission-reducing heat-insulating anti-condensation water-based paint as claimed in claim 1, wherein the fumed silica is hydrophilic fumed silica, and the particle size is 5-300 nm; the titanium dioxide is zirconium oxide coated rutile type titanium dioxide, and the particle size is 300-400 um; the particle size of the hollow glass bead is less than or equal to 40um, and the compressive strength of the hollow glass bead is more than 100MPa.

3. The energy-saving emission-reducing heat-insulating anti-condensation water-based paint as claimed in claim 1, wherein 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 dispersant, the solvent is water, and the mass solid content is 30-50%; the dispersion anti-settling agent 2 is a polymer dispersant of hydrophobic modified polyacrylic acid ammonium salt, the solvent is alkylbenzene, and the mass solid content is 90-98%.

4. The energy-saving emission-reducing heat-insulating anti-condensation water-based paint as claimed in claim 3, which 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 a dispersing anti-settling agent 2, stirring into a paste, then adding hollow glass beads and the rest of dispersing anti-settling agent 1 to form a functional filler dispersing slurry, and finally adding the rest of components and the rest of deionized water.

5. The energy-saving emission-reducing heat-insulating anti-condensation water-based paint as claimed in claim 4, wherein the addition amount of the partial deionized water is 0.8-3 times of the mass of the fumed silica; the adding amount of the partial dispersion anti-settling agent 1 is 0.3 to 0.5 percent of the mass of the fumed silica; the addition amount of the dispersing anti-settling agent 2 is 1-2% of the mass of the titanium dioxide.

6. The energy-saving emission-reducing heat-insulating anti-condensation water-based paint as claimed in claim 4, characterized in that the functional filler dispersion slurry is prepared by the following steps:

taking part of deionized water, adding fumed silica into the part of deionized water, stirring at a low speed, adding part of dispersion anti-settling agent 1, stirring and dispersing until no obvious layering exists, adding a pH regulator to adjust the pH to 9.5-10.5, and then transferring to a sand mill for continuous dispersion to finally obtain slightly viscous fumed silica dispersion; wherein, in the process of low-speed stirring, the stirring speed is less than or equal to 500r/min, and after 10-20 min of low-speed stirring, part of the dispersion anti-settling agent 1 is added;

adding titanium dioxide into the fumed silica dispersion, stirring at low speed until no large agglomerated powder exists, adding the dispersion anti-settling agent 2, and stirring at high speed to obtain paste fumed silica + titanium dioxide dispersion; wherein, in the process of low-speed stirring, the stirring speed is less than or equal to 500r/min; in the process of high-speed stirring, 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 paste-like fumed silica + titanium dioxide dispersion, and supplementing and adding the rest of the 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.

7. The energy-saving emission-reducing heat-insulating anti-condensation water-based paint as claimed in claim 4, wherein the silicone-acrylate emulsion is a single-component room-temperature-curing silicone-acrylate 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 flash rust inhibitor is an organic zinc chelate solution; the defoaming agent is a water-based organic silicon defoaming agent; the flatting agent is dimethyl siloxane flatting agent; the pH regulator is aminomethyl benzyl alcohol pH regulator.

8. The preparation method of the energy-saving emission-reducing heat-insulating anti-condensation water-based paint according to any one of claims 1 to 7, characterized by comprising the following steps:

and sequentially adding the film-forming assistant, the flash rust inhibitor, the defoamer, the flatting agent, the silicone-acrylic emulsion and the residual deionized water into the functional filler dispersed slurry, and uniformly stirring at a low speed to obtain the energy-saving emission-reducing heat-insulating anti-condensation water-based paint.

9. The construction process of the energy-saving emission-reducing heat-insulating anti-condensation water-based paint as claimed in any one of claims 1 to 7, characterized by comprising the following steps:

10. The construction process of the energy-saving emission-reducing heat-insulating anti-condensation water-based paint according to claim 9, characterized in that 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 percent, 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 by 0-10 vol percent;

the curing conditions were: when the temperature is 20-30 ℃ and the relative humidity is less than or equal to 85 percent, the surface is dried for 2-4 hours, and the surface is completely dried for 48 hours.