阅读说明：本技术 保温隔热涂料及其制备方法 (Heat-insulating coating and preparation method thereof ) 是由 杨昊天 于 2020-09-18 设计创作，主要内容包括：本发明提供一种保温隔热涂料,其中所述碱土金属复合盐以料浆形式加入所述丙烯酸乳液中,且所述碱土金属复合盐中硬硅钙石的质量分数为4％；所述钛白粉为金红石型钛白粉。本发明还提供一种保温隔热涂料的制备方法,经过机械分散和超声波分散、低速搅拌、高速搅拌、球磨处理得到保温隔热涂料成品。本发明以碱土金属复合盐和钛白粉作为隔热功能填料,以丙烯酸乳液作为成膜物质,辅以多种功能助剂制备保温隔热涂料。原材料易得、成本低,涂料制备工艺简单,涂层隔热性能良好,可实现建筑节能。(The invention provides a heat-insulating coating, wherein alkaline earth metal composite salt is added into acrylic emulsion in a slurry form, and the mass fraction of xonotlite in the alkaline earth metal composite salt is 4%; the titanium dioxide is rutile type titanium dioxide. The invention also provides a preparation method of the heat-preservation and heat-insulation coating, and a finished product of the heat-preservation and heat-insulation coating is obtained through mechanical dispersion, ultrasonic dispersion, low-speed stirring, high-speed stirring and ball milling treatment. The invention prepares the heat-insulating coating by taking alkaline earth metal composite salt and titanium dioxide as heat-insulating functional filler, taking acrylic emulsion as a film-forming substance and assisting with various functional additives. The raw materials are easy to obtain, the cost is low, the preparation process of the coating is simple, the heat-insulating property of the coating is good, and the energy conservation of buildings can be realized.)

1. The heat-insulation coating is characterized by comprising the following components in parts by weight:

35 parts of acrylic emulsion, 0-12 parts of alkaline earth metal composite salt, 1-7 parts of kaolin, 0-30 parts of titanium dioxide and 10-20 parts of water;

wherein the content of the first and second substances,

the alkaline earth metal composite salt is added into the acrylic emulsion in a slurry form, and the mass fraction of xonotlite in the alkaline earth metal composite salt is 4%;

the titanium dioxide is rutile type titanium dioxide.

2. A heat-insulating coating material as claimed in claim 1,

9 parts of alkaline earth metal composite salt;

the titanium dioxide is 30 parts.

3. A heat-insulating coating as claimed in claim 1 or 2, further comprising the following components in parts by weight:

1-2 parts of wetting agent, 1-2 parts of dispersing agent, 0.1-0.5 part of defoaming agent, 2-4 parts of film-forming assistant, 0.2-0.4 part of mildew inhibitor, 0.3-0.6 part of flatting agent and 1-3 parts of thickening agent.

4. A heat preservation and insulation coating as claimed in claim 3, characterized in that the film forming auxiliary agent is a mixture of a ketol ester organic compound and a dialkylene glycol phenyl ether in a mass ratio of 2-4: 1.

5. The preparation method of the heat-preservation and heat-insulation coating is characterized by comprising the following steps:

uniformly stirring water, alkaline earth metal composite salt, kaolin, titanium dioxide, a half weight of defoaming agent, a half weight of wetting agent and a half weight of dispersing agent, and then performing mechanical dispersion and ultrasonic dispersion to prepare slurry;

adding the slurry, the dispersant of the other half weight, the wetting agent of the other half weight, the defoamer of the other half weight, the film-forming assistant, the mildew preventive and the flatting agent into the acrylic emulsion, stirring at a low speed, and then stirring at a high speed to obtain a semi-finished coating, wherein the low-speed stirring speed is 300-500r/min, the low-speed stirring is carried out twice, the interval time is 18min, the first low-speed stirring time is 5min, the second low-speed stirring time is 8min, and the high-speed stirring speed is 1480 r/min;

and adding a thickening agent into the semi-finished coating, and then carrying out ball milling treatment to obtain a heat-insulating coating finished product, wherein the ball milling time is 10-11 h.

6. The method for preparing a heat-insulating coating material according to claim 5,

the rotating speed of the mechanical dispersion is 140-170 r/min;

the ultrasonic power for ultrasonic dispersion is 200-240W, and the frequency is 220-270 KHz;

the mechanical dispersion and the ultrasonic dispersion are carried out at intervals, each dispersion time is 12-14min, a rest time is provided between each two dispersions, and the rest time is 6-8 min.

7. The method for preparing a heat-insulating coating according to claim 6, wherein the thickener is added in three times, one third of the total weight is added for the first time, one half of the total weight is added for the second time, and one sixth of the total weight is added for the third time.

Technical Field

The invention relates to the technical field of building coatings, in particular to a heat-preservation and heat-insulation coating and a preparation method thereof.

Background

The energy consumption of buildings accounts for about 30-40% of the total social energy consumption, and the heat insulation technology of the external walls of the buildings is an important means for building energy conservation. At present, the energy conservation of buildings in China presents three current situations.

Firstly, the building energy consumption of China occupies about 33% of the total social energy consumption. The total energy consumption of buildings in China is increased year by year, and the proportion of energy consumption is increased to 27.45 percent from 10 percent at the end of 70 years in the 20 th century. With the acceleration of urbanization and the improvement of the quality of life of people, the building energy consumption proportion of China finally rises to about 35 percent.

Secondly, the high energy consumption building proportion of China is large, and the energy crisis is aggravated. The construction area built in China every year is as high as 16-20 hundred million m2, which exceeds the sum of the construction areas built in all developed countries every year, and more than 97% of buildings with high energy consumption are built. Because of poor heat insulation performance, the building can save energy by 50% in China, and the heating energy consumption is about 1.5 times per square meter in European countries.

Thirdly, the energy-saving condition of the buildings in China is backward and needs to be improved. Building energy consumption is extremely serious in China, and building energy consumption growth speed far exceeds possible growth speed of energy production. Therefore, building energy conservation is imperative, and the optimization of building heat preservation and insulation systems is urgent.

The development trend of the thermal insulation coating for the exterior wall of the building is as follows: the development from single-barrier type, reflection type and radiation type heat-insulating coatings to multifunctional composite heat-insulating coatings or the development towards coating compounding is carried out. Secondly, the development of infrared emission heat-insulating coating also becomes a development trend of building heat-insulating coating. Therefore, the search for suitable high-emissivity heat-insulating filler becomes the key for developing high-performance exterior wall heat-insulating paint.

Disclosure of Invention

It is an object of the present invention to provide a thermal insulating coating and to provide at least the advantages which will be described later.

The invention also aims to provide a preparation method of the heat-insulating coating, which is characterized in that alkaline earth metal composite salt and titanium dioxide are used as heat-insulating functional fillers, acrylic emulsion is used as a film-forming substance, and a plurality of functional additives are used as auxiliary materials to prepare the heat-insulating coating. The raw materials are easy to obtain, the cost is low, the preparation process of the coating is simple, the heat-insulating property of the coating is good, and the energy conservation of buildings can be realized.

The invention provides a heat-insulating coating which comprises the following components in parts by weight:

35 parts of acrylic emulsion, 0-12 parts of alkaline earth metal composite salt, 1-7 parts of kaolin, 0-30 parts of titanium dioxide and 10-20 parts of water;

wherein the content of the first and second substances,

the alkaline earth metal composite salt is added into the acrylic emulsion in a slurry form, and the mass fraction of xonotlite in the alkaline earth metal composite salt is 4%;

the titanium dioxide is rutile type titanium dioxide.

Preferably, in the heat-preservation and heat-insulation coating,

9 parts of alkaline earth metal composite salt;

the titanium dioxide is 30 parts.

Preferably, the heat-insulating coating further comprises the following components in parts by weight:

1-2 parts of wetting agent, 1-2 parts of dispersing agent, 0.1-0.5 part of defoaming agent, 2-4 parts of film-forming assistant, 0.2-0.4 part of mildew inhibitor, 0.3-0.6 part of flatting agent and 1-3 parts of thickening agent.

Preferably, the film-forming aid is a mixture of a ketol ester organic compound and dialkylene glycol phenyl ether in a mass ratio of 2-4: 1.

The invention also provides a preparation method of the heat-insulating coating, which comprises the following steps:

uniformly stirring water, alkaline earth metal composite salt, kaolin, titanium dioxide, a half weight of defoaming agent, a half weight of wetting agent and a half weight of dispersing agent, and then performing mechanical dispersion and ultrasonic dispersion to prepare slurry;

adding the slurry, the dispersant of the other half weight, the wetting agent of the other half weight, the defoamer of the other half weight, the film-forming assistant, the mildew preventive and the flatting agent into the acrylic emulsion, stirring at a low speed, and then stirring at a high speed to obtain a semi-finished coating, wherein the low-speed stirring speed is 300-500r/min, the low-speed stirring is carried out twice, the interval time is 18min, the first low-speed stirring time is 5min, the second low-speed stirring time is 8min, and the high-speed stirring speed is 1480 r/min;

and adding a thickening agent into the semi-finished coating, and then carrying out ball milling treatment to obtain a heat-insulating coating finished product, wherein the ball milling time is 10-11 h.

Preferably, in the preparation method of the heat-preservation and heat-insulation coating,

the rotating speed of the mechanical dispersion is 140-170 r/min;

the ultrasonic power for ultrasonic dispersion is 200-240W, and the frequency is 220-270 KHz;

the mechanical dispersion and the ultrasonic dispersion are carried out at intervals, each dispersion time is 12-14min, a rest time is provided between each two dispersions, and the rest time is 6-8 min.

Preferably, in the preparation method of the heat-preservation and heat-insulation coating, the thickening agent is added in three times, wherein the thickening agent is added in one third of the total weight for the first time, one half of the total weight for the second time and one sixth of the total weight for the third time.

Compared with the prior art, the heat-insulating coating and the preparation method thereof have the following beneficial effects:

preparing a heat-insulating coating by taking alkaline earth metal composite salt and titanium dioxide as heat-insulating functional fillers, taking acrylic emulsion as a film-forming substance and assisting with multiple functional auxiliaries;

the raw materials are easy to obtain, the cost is low, the preparation process of the coating is simple, the heat-insulating property of the coating is good, and the energy conservation of buildings can be realized;

the acrylic emulsion has good transparency, low refractive index, good water resistance, weather resistance and adhesive force, safety, environmental protection and simple and convenient construction;

the alkaline earth metal composite salt is added into the coating in a slurry form, the particle appearance is complete, the dispersion is good, and the heat insulation performance is good;

the rutile titanium dioxide has high refractive index, and can effectively improve the heat reflectivity of the coating when dispersed in the coating.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of an embodiment of a method for preparing a thermal insulating coating according to the present invention;

FIG. 2 is a graph showing the results of heat-insulating property tests of the heat-insulating coating prepared by using alkaline earth metal composite salts in different addition states;

FIG. 3 is a SEM image of the micro-morphology of alkaline earth metal composite salts in the thermal insulation coating prepared by adopting alkaline earth metal composite salts in different adding states;

FIG. 4 is a graph showing the results of heat insulation tests of the thermal insulation coating prepared by using alkaline earth metal composite salts with different addition amounts;

FIG. 5 is a diagram showing the results of heat insulation performance tests of heat-insulating coatings prepared by using different titanium dioxide powders;

FIG. 6 is a diagram showing the results of heat insulation performance tests of heat-insulating coatings prepared by using titanium dioxide powders with different addition amounts.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

The heat-insulating paint consists of filming matter, pigment, stuffing, solvent and assistant. Wherein, the film-forming substance is the main component of the coating film, is the main substance which enables the heat-preservation and heat-insulation coating to be firmly attached to the surface of the coated object to form a continuous film and determines the basic characteristics (namely, the decorative performance) of the heat-preservation and heat-insulation coating; the main function of the pigment in the heat-insulating coating is to enable a coating film to have various required colors and certain covering power, and the doping amount and the crystal form of the pigment also have certain influence on the heat-insulating property of the coating film; the filler is also called extender pigment, mainly alkaline earth metal salt, has better infrared spectrum heat effect, has important influence on the heat insulation performance of the coating film by the adding mode and the mixing amount, can improve the durability and the hardness of the coating film, reduce the shrinkage rate of the coating film and the like; the auxiliary agent mainly has the function of improving certain performances of the coating and the film, and has obvious influence on the performances of the coating although the general dosage is very small; the solvent (or water) mainly functions to adjust the viscosity and the solid content of the coating.

From the viewpoint of environmental protection, the emulsion is preferably aqueous, and water resistance, stain resistance, weather resistance and the like should be considered.

The intensity of the ability to reflect sunlight is mainly characterized by the refractive index of the material. The synthetic resin has a refractive index of 1.45 to 1.50, and the fluorine-containing polymer has a refractive index of 1.34 to 1.42. Thus, the solar heat reflecting effect of the coating does not change significantly with the choice of different organic resins.

The synthetic resin used for the thermal insulating coating is required to have a smaller absorption of visible light and near infrared light as well as a lower absorption of the visible light and near infrared light, and therefore, the resin is required to have a high transparency and a low absorption of solar heat. Three typical organic resins were selected for use in the present invention: the organic silicon-acrylic resin, the acrylic resin and the epoxy resin are respectively mixed with TiO2 to prepare a mixture, and the solar heat absorptivity of the mixture prepared from three different organic resins and TiO2 is not greatly different, as shown in Table 1.

TABLE 1 solar Heat absorptivity of the blends prepared with synthetic resin emulsion and TiO2

Organic resin	Pigment (I)	Absorption rate alpha
			Silicone-acrylic resin	TiO2	0.22
Acrylic resin	TiO2	0.24
			Epoxy resin	TiO2	0.25

In view of the above analysis, the acrylic emulsion of the present invention has good transparency and a low refractive index; meanwhile, the acrylic emulsion has good water resistance, weather resistance and adhesive force, is safe and environment-friendly, is simple and convenient to construct, and the physical parameters of the acrylic emulsion are shown in Table 2.

TABLE 2 physical parameters of acrylic emulsions

Item	Index (I)
		Appearance of the product	Milky white color
Glass transition temperature (Tg)	14～23℃
		PH value (PH value)	7.5～9.0
Viscosity (mpa.a)	500～1500
		Solid content (wt%)	48～50

Under the condition that emulsion and solid content are kept unchanged, alkaline earth metal composite salt is added into a coating system in the form of slurry and solid powder (passing through a 120-mesh sieve), the addition amount of xonotlite is 4%, the influence of different addition states on the heat-insulating property of a coating film is researched, the test result of the heat-insulating property is shown in figure 2, and the heat-insulating property of the coating film added with the alkaline earth metal composite salt in the form of slurry is better than that of the coating film added with the alkaline earth metal composite salt in the form of solid powder.

The microscopic morphology of the alkaline earth metal composite salt dispersed in the coating was analyzed by a JSM-6490LV Scanning Electron Microscope (SEM) manufactured by japan electronics corporation, and the SEM for microscopic morphology analysis is shown in fig. 3, and the alkaline earth metal composite salt added to the emulsion in the form of slurry had a complete particle morphology and was well dispersed. However, since the particle structure is easily broken by mechanical force during grinding of the dried alkaline earth metal composite salt, the addition of the alkaline earth metal composite salt in a solid form does not have a hollow structure of the alkaline earth metal composite salt particles, and thus the heat insulation effect cannot be achieved in the coating.

Under the condition that the emulsion and the solid content are not changed, alkaline earth metal composite salts with different doping amounts (0%, 3%, 6%, 9% and 12%) are added to prepare the coating, and the heat insulation performance test result of the coating is shown in figure 4. The temperature value is reduced along with the increase of the addition amount of the alkaline earth metal composite salt, the heat insulation performance of the coating is improved, but the improvement range of the heat insulation performance is gradually reduced along with the increase of the addition amount; when the addition amount is more than 9%, the temperature value approaches to 66 ℃, and the heat insulation performance of the coating tends to be stable.

The alkaline earth metal composite salt hollow particles are dispersed in the coating, and micro bubbles are formed in the coating after the coating is cured, so that the heat-insulating property of the coating is improved. As the amount of incorporation increases, the more microbubbles are introduced, the better the thermal insulation properties of the coating. The alkaline earth metal composite salt hollow particles have the characteristics of large specific surface area and easy spontaneous aggregation, if the mixing amount of the alkaline earth metal composite salt is continuously increased, the dispersion state cannot be effectively improved, and the spontaneous aggregation of the hollow particles can cause uneven distribution of micro bubbles in the coating, so that the heat-insulating property of the coating cannot be obviously improved. Therefore, the alkaline earth metal composite salt can improve the heat-insulating property of the coating. Along with the increase of the doping amount of the alkaline earth metal composite salt, the heat insulation performance of the coating is gradually improved, and the heat insulation performance tends to be stable when the doping amount is more than 9 percent.

Titanium dioxide is an important component of water-based emulsion paint as a white powder pigment with excellent quality, not only gives bright and white color to the surface of a coated object, but also can improve the performance of a coating film, improve the mechanical strength and the corrosion resistance of the coating film, reduce the air permeability and the water permeability of the coating film and play a certain role in heat insulation performance.

Titanium dioxide has three types of crystals, namely rutile type, anatase type and brookite type. Wherein the brookite titanium dioxide has no industrial value, and the rutile titanium dioxide and the anatase titanium dioxide are both used as pigments in the paint product.

The performance of rutile titanium dioxide and anatase titanium dioxide were respectively tested, and the test results are shown in table 3.

TABLE 3 comparison of the Performance of rutile type titanium dioxide with that of anatase type titanium dioxide

The rutile type titanium dioxide has compact crystal structure, large relative density and better covering power than anatase type titanium dioxide, and is about 100: 77, therefore, the capability of reflecting light radiation is stronger than that of anatase titanium dioxide, and the heat-insulating property is good. In addition, the chalking resistance and the light stability are better than those of anatase titanium dioxide.

Under the condition that the formula and other components are not changed, rutile type titanium dioxide and anatase type titanium dioxide are respectively used as pigments to prepare the coating, and the test result of the heat insulation performance of the coating is shown in figure 5. Under the same condition, the temperature value of titanium dioxide added with two crystal forms is reduced, wherein the temperature value of the sample No. 1 is lower than that of the sample No. 2. The heat-insulating property of the coating can be improved by the titanium dioxide with two crystal forms, wherein the heat-insulating property of the coating with the rutile type titanium dioxide is obviously superior to that of the coating with the anatase type titanium dioxide.

Under the condition that the emulsion and the solid content are kept unchanged, rutile type titanium dioxide with different doping amounts (0%, 10%, 15%, 20%, 25%, 30%, 35% and 40%) is added to prepare the coating, and the test result is shown in fig. 6. When the mixing amount of the titanium dioxide is 10%, the temperature value is sharply reduced; the mixing amount of the titanium dioxide is continuously increased, and the temperature value is reduced slowly; when the mixing amount of the titanium dioxide is 30%, the temperature value is 64.78 ℃; then, the amount of the admixture is continuously increased, and the temperature value is slightly increased.

The rutile type titanium dioxide has high refractive index, can effectively improve the thermal reflectivity of the coating when dispersed in the coating, but the titanium dioxide particles can agglomerate spontaneously along with the increase of the doping amount of the titanium dioxide, and the effective reflection surface is reduced. Therefore, when the mixing amount of the titanium dioxide is less than 10%, the temperature value is obviously reduced, and the heat insulation performance of the coating is improved; then, the mixing amount of titanium dioxide is increased, the effective reflection surface of the coating is not increased much due to the self-adsorption set of particles, the temperature value is not reduced obviously, and the heat reflection capability of the coating is not improved obviously; when the mixing amount of the titanium dioxide exceeds 30%, the titanium dioxide particles are seriously agglomerated spontaneously, the effective reflection surface is reduced, and the temperature value is increased, so that the heat insulation effect of the coating is reduced.

Therefore, the heat-insulating property of the coating can be improved by adding a proper amount of rutile titanium dioxide, but the heat-insulating property of the coating is not improved by adding excessive titanium dioxide.

The invention provides a heat-insulating coating which comprises the following components in parts by weight:

35 parts of acrylic emulsion, 0-12 parts of alkaline earth metal composite salt, 1-7 parts of kaolin, 0-30 parts of titanium dioxide and 10-20 parts of water;

wherein the content of the first and second substances,

the alkaline earth metal composite salt is added into the acrylic emulsion in a slurry form, and the mass fraction of xonotlite in the alkaline earth metal composite salt is 4%;

the titanium dioxide is rutile type titanium dioxide.

In one embodiment of the thermal insulation coating provided by the invention,

9 parts of alkaline earth metal composite salt;

the titanium dioxide is 30 parts.

In one embodiment of the heat preservation and insulation coating provided by the invention, the heat preservation and insulation coating further comprises the following components in parts by weight:

1-2 parts of wetting agent, 1-2 parts of dispersing agent, 0.1-0.5 part of defoaming agent, 2-4 parts of film-forming assistant, 0.2-0.4 part of mildew inhibitor, 0.3-0.6 part of flatting agent and 1-3 parts of thickening agent.

Preferably, the film-forming aid is a mixture of a ketol ester organic compound and dialkylene glycol phenyl ether in a mass ratio of 2-4: 1.

The invention also provides a preparation method of the heat-insulating coating, which comprises the following steps:

uniformly stirring water, alkaline earth metal composite salt, kaolin, titanium dioxide, a half weight of defoaming agent, a half weight of wetting agent and a half weight of dispersing agent, and then performing mechanical dispersion and ultrasonic dispersion to prepare slurry;

adding the slurry, the dispersant of the other half weight, the wetting agent of the other half weight, the defoamer of the other half weight, the film-forming assistant, the mildew preventive and the flatting agent into the acrylic emulsion, stirring at a low speed, and then stirring at a high speed to obtain a semi-finished coating, wherein the low-speed stirring speed is 300-500r/min, the low-speed stirring is carried out twice, the interval time is 18min, the first low-speed stirring time is 5min, the second low-speed stirring time is 8min, and the high-speed stirring speed is 1480 r/min;

and adding a thickening agent into the semi-finished coating, and then carrying out ball milling treatment to obtain a heat-insulating coating finished product, wherein the ball milling time is 10-11 h.

In one embodiment of the preparation method of the heat-preservation and heat-insulation coating provided by the invention,

the rotating speed of the mechanical dispersion is 140-170 r/min;

the ultrasonic power for ultrasonic dispersion is 200-240W, and the frequency is 220-270 KHz;

the mechanical dispersion and the ultrasonic dispersion are carried out at intervals, each dispersion time is 12-14min, a rest time is provided between each two dispersions, and the rest time is 6-8 min.

In one embodiment of the preparation method of the heat-preservation and heat-insulation coating provided by the invention, the thickening agent is added in three times, wherein the thickening agent is added in one third of the total weight for the first time, one half of the total weight for the second time and one sixth of the total weight for the third time.

According to the regulations of the national standard GB/T25261-2010, the solar light reflectance and the hemispherical emissivity of the flat coating type heat-insulating coating are tested, and the results are shown in Table 4.

TABLE 4 solar reflectance and hemispherical emissivity of flat-coating type thermal insulation coating

Item	Index (I)	Measured value
			Solar reflectance (white) (%)	≥80	85
Hemispherical emissivity (%)	≥80	86

From the test results in the table above, it can be seen that: the solar light reflectance of the flat coating type heat-insulating coating is 85 percent, and the requirement that the solar light reflectance of the coating is more than or equal to 80 percent in GB/T25261-2010 of reflective heat-insulating coating for buildings is met; the hemispherical emissivity is 86 percent, and the requirement that the hemispherical emissivity of the coating is more than or equal to 80 percent in GB/T25261-2010 of reflective thermal insulation coating for buildings is met. Therefore, the heat insulation coating provided by the invention has high reflectivity and high emissivity and has good heat reflection and heat insulation effects.

Under the condition that no standard exists in China and no laboratory detection method for the heat preservation performance of the heat preservation and insulation coating exists, the method is used for acquiring data by performing actual measurement on outdoor trial engineering application according to the regulation of an industry standard 'residential building energy-saving detection standard' JGJ/T132-supplement 2009: after the inner surface and the outer surface of a 490mm thick solid brick gas wall are respectively coated with a heat-insulating coating, the heat flux of a bare wall, an inner coating and an outer coating of the heat-insulating coating are tested, and after the building forms stable heat transfer indoors and outdoors, the heat flux in the wall is obviously reduced compared with that of the bare wall after the coating is coated inside and outside the outer wall under the condition that the temperatures on two sides of the wall are basically kept unchanged. The heat-insulating coating can affect the heat flux of the wall body by changing the heat exchange effect of the surface of the wall body, thereby improving the heat-insulating effect of the heat-insulating coating.

The dry film thickness of the heat-insulating coating provided by the invention is not more than 0.4mm, the equivalent thermal resistance value of the coating in the wall is not less than 0.88 square meter K/W, and the equivalent thermal resistance value of the coating outside the wall is not less than 0.78 square meter K/W.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.