CN111978807A

CN111978807A - Heat-preservation and heat-insulation coating and preparation method thereof

Info

Publication number: CN111978807A
Application number: CN202010984030.6A
Authority: CN
Inventors: 杨昊天
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2020-11-24

Abstract

The invention relates to the technical field of building coatings, and provides a heat-insulating coating which comprises the following raw materials, by mass, 8-20 parts of deionized water, 30-40 parts of acrylic resin emulsion, 1-12 parts of xonotlite type calcium silicate, 1-9 parts of kaolin, 5-30 parts of rutile titanium dioxide, 0.1-0.8 part of a defoaming agent, 2-5 parts of a film-forming assistant, 0.2-0.4 part of a mildew inhibitor, 0.3-0.6 part of a flatting agent, 1-2 parts of a dispersing agent, 1-2 parts of a wetting agent and 1-3 parts of a thickening agent, wherein the sum of the components is 100 parts. The invention also provides a preparation method of the heat-insulating coating. The heat-insulating coating has the advantages of easily available raw materials, low cost, simple preparation process, good heat-insulating property of the coating and capability of realizing building energy conservation.

Description

Heat-preservation and heat-insulation coating and preparation method thereof

Technical Field

The invention belongs to the technical field of building coatings, and particularly relates to a heat-insulating coating and a preparation method thereof.

Background

The building area built in China every year is as high as 16-20 billion cubic meters, which exceeds the sum of the building areas built in all developed countries every year, and due to poor heat insulation performance, the building can save 50% of energy in China, and the heating energy consumption is about 1.5 times per square meter in European countries. Therefore, building energy conservation is imperative, optimization of building heat preservation and insulation systems is urgent, building energy consumption accounts for about 30% -40% of the total social energy consumption, and building external wall heat preservation technology is an important means for building energy conservation.

The traditional heat preservation and insulation of buildings usually adopt external-hanging organic or inorganic heat preservation plates, the occupied area is large, the construction period is long, the construction process is complex, and meanwhile, the potential safety hazards such as flammability, layer rising, falling, leakage and the like exist. Due to a plurality of defects of heat preservation in the wall body, the building heat preservation and insulation coating begins to turn from the inner wall to the outer wall, which provides a larger development space for the building heat preservation and insulation outer wall coating.

The building external wall heat-insulating coating develops from three heat-insulating coatings of a barrier type, a reflection type and a radiation type to a multifunctional composite heat-insulating coating or develops to a coating compounding direction. The development of infrared emission heat-insulating coating also becomes a development trend of building heat-insulating coating. The infrared emittance heat preservation and insulation coating achieves the purposes of heat preservation and insulation by utilizing the fact that a coating has larger emittance in a specific infrared band and adopting a mode of actively emitting a heat source; meanwhile, the thickness of the traditional coating is changed into a thin layer, so that the problems of material consumption, complicated construction and the like are solved.

Disclosure of Invention

The invention aims to provide a heat-insulating coating which can reduce the heat flux density of a building wall enclosure structure, reduce heat transfer and has good heat-insulating effect.

The invention also aims to provide a preparation method of the heat-insulating coating, and the heat-insulating coating obtained by the preparation method can influence the heat flux of the wall body by changing the heat exchange effect of the surface of the wall body so as to improve the heat-insulating effect of the wall body.

The invention provides a heat-insulating coating which comprises the following raw materials, by mass, 8-20 parts of deionized water, 30-40 parts of acrylic resin emulsion, 1-12 parts of xonotlite type calcium silicate, 1-9 parts of kaolin, 5-30 parts of rutile type titanium dioxide, 0.1-0.8 part of a defoaming agent, 2-5 parts of a film-forming auxiliary agent, 0.2-0.4 part of a mildew inhibitor, 0.3-0.6 part of a flatting agent, 1-2 parts of a dispersing agent, 1-2 parts of a wetting agent and 1-3 parts of a thickening agent, wherein the sum of the components is 100 parts.

Preferably, the defoamer is a polymeric defoamer.

Preferably, the paint comprises the following raw materials, by mass, 8 parts of deionized water, 35 parts of acrylic resin emulsion, 11 parts of xonotlite-type calcium silicate, 7 parts of kaolin, 28 parts of rutile titanium dioxide, 0.2 part of a defoaming agent, 5 parts of a film-forming aid, 0.3 part of a mildew inhibitor, 0.5 part of a leveling agent, 1 part of a dispersing agent, 1 part of a wetting agent and 3 parts of a thickening agent.

Preferably, the paint comprises the following raw materials, by mass, 14 parts of deionized water, 33 parts of acrylic resin emulsion, 10 parts of xonotlite-type calcium silicate, 8 parts of kaolin, 25 parts of rutile titanium dioxide, 0.4 part of a defoaming agent, 5 parts of a film-forming aid, 0.4 part of a mildew inhibitor, 0.2 part of a leveling agent, 1 part of a dispersing agent, 2 parts of a wetting agent and 1 part of a thickening agent.

Preferably, the paint comprises the following raw materials, by mass, 18 parts of deionized water, 35 parts of acrylic resin emulsion, 9 parts of xonotlite calcium silicate, 7 parts of kaolin, 25 parts of rutile titanium dioxide, 0.6 part of a defoaming agent, 2 parts of a film-forming aid, 0.2 part of a mildew preventive, 0.2 part of a leveling agent, 1 part of a dispersing agent, 1 part of a wetting agent and 1 part of a thickening agent.

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

s1, uniformly mixing 8-20 parts of deionized water with 1-12 parts of xonotlite type calcium silicate, 1-9 parts of kaolin and 5-30 parts of rutile type titanium dioxide, adding 0.5-1 part of wetting agent, 0.05-0.4 part of defoaming agent and 0.5-1 part of dispersing agent, uniformly stirring, and preparing slurry through mechanical dispersion and ultrasonic dispersion;

s2, firstly, placing the acrylic resin emulsion into a lifting dispersion stirrer for stirring, then adding the slurry prepared in the step S1 into 30-40 parts of the stirred acrylic resin emulsion, keeping the stirring state, adding 0.5-1 part of wetting agent, 0.5-1 part of dispersing agent, 0.05-0.4 part of defoaming agent, 2-5 parts of film-forming auxiliary agent, 0.2-0.4 part of mildew preventive and 0.3-0.6 part of flatting agent, and mechanically stirring at the low-speed stirring rate of 400-500r/min for 30-85 min;

s3, uniformly dispersing the slurry stirred at the low speed in the step S2 under the action of a high-speed dispersing machine, wherein the stirring speed of the high-speed dispersing agent is 1200-1600r/min, and the stirring time is 50-100 min;

s4, adding ammonia water to adjust the pH value of the solution prepared in the step S3;

s5, stirring the solution in the step S4 at a low speed again, adding a thickening agent in the stirring process, and performing ball milling operation to prepare the heat-preservation and heat-insulation coating, wherein the low-speed stirring speed is 300-450r/min, and the stirring time is 20-40 min.

Preferably, in the step S2, the low-speed stirring speed is 450r/min, and the stirring time is 60 min.

Preferably, the stirring speed of the high-speed dispersant in the step S3 is 1500r/min, and the stirring time is 80min

Preferably, the ammonia water in the step S4 is used for adjusting the pH value of the solution to 8-10.

Preferably, in the step S5, the low-speed stirring speed is 400r/min, and the stirring time is 30 min.

Compared with the prior art, the heat preservation and insulation material and the preparation method thereof have the following beneficial technical effects:

the heat-insulating coating is prepared by taking alkaline earth metal composite salt and titanium dioxide as heat-insulating functional fillers, taking resin emulsion as a film-forming substance and assisting with various functional additives. The raw materials used by the coating are easy to obtain, the cost is low, the coating preparation process is simple, the heat-insulating property of the coating is good, and the energy conservation of buildings can be realized. The heat-insulating coating is widely applied to areas hot in summer and warm in winter, and good social benefit and economic benefit are generated; the infrared emission function of the coating is combined, the coating is popularized and applied in severe cold regions, and the requirement of cold preservation of buildings in cold regions can be met.

The heat insulation coating has high reflectivity and high emissivity. In hot areas, the heat insulation and preservation coating realizes heat insulation by high reflection and high emission; in severe cold areas, the heat-insulating coating realizes heat preservation by high reflection and high emission, and achieves the effects of being warm in winter and cool in summer.

The polymer defoaming agent is adopted, the defoaming speed is high, the dispersion performance is excellent, particularly, demulsification floating oil is not easy to happen after dilution, the foam inhibition time is long, the efficiency is high, the using amount is low, the polymer defoaming agent is non-toxic, and the polymer defoaming agent is easy to disperse in water, can be well dissolved with liquid products, is not easy to demulsify floating oil, and effectively improves the performance of the heat-insulating coating.

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 schematic flow chart of a preparation method of a thermal insulation coating provided by the invention;

FIG. 2 is a graph showing the effect of different amounts of xonotlite-type calcium silicate on the thermal insulation performance of a coating;

FIG. 3 is a graph showing the influence of titanium dioxide of different crystal forms on the heat-insulating property of a coating,

FIG. 4 is a graph showing the effect of different xonotlite-type calcium silicate additions on the thermal insulation properties of a coating;

FIG. 5 is an SEM image of various loading states of xonotlite-type calcium silicate;

FIG. 6 is a graph of bare wall heat flux and inside and outside surface temperature;

FIG. 7 is a graph showing the heat flux and the temperature of the inner and outer surfaces of a wall coated with a thermal insulating coating;

FIG. 8 is the wall heat flux and inside and outside surface temperature curves of the exterior heat-insulating coating.

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.

The invention provides a heat-insulating coating, which comprises the following raw materials, by mass, 8-20 parts of deionized water, 30-40 parts of acrylic resin emulsion, 1-12 parts of xonotlite-type calcium silicate, 1-9 parts of kaolin, 5-30 parts of rutile titanium dioxide, 0.1-0.8 part of a defoaming agent, 2-5 parts of a film-forming assistant, 0.2-0.4 part of an anti-mildew agent, 0.3-0.6 part of a leveling agent, 1-2 parts of a dispersing agent, 1-2 parts of a wetting agent and 1-3 parts of a thickening agent, wherein the sum of the components is 100 parts.

The invention also provides a preparation method of the heat-insulating coating, as shown in fig. 1, a flow diagram of the preparation method of the heat-insulating coating provided by the embodiment of the invention is shown, for convenience of description, only the parts related to the embodiment of the invention are shown, and the details are as follows: the preparation method comprises the following steps:

Preferably, the stirring speed of the high-speed dispersing agent in the step S3 is 1500r/min, and the stirring time is 80 min.

The heat-insulating coating prepared by the invention has the advantages of strong heat-insulating effect, high safety in construction and use, ecological green environmental protection, and capability of meeting the comprehensive requirements of green energy-saving standard, no shedding, no leakage, no delamination, no cracking, good weather resistance and beautiful decoration.

The above technical solution of the present invention will be described in detail with reference to specific examples.

The material was prepared for implementation according to the component formulation of table 1.

Table 1 shows the mass parts of the component formulas of example 1, example 2 and example 3

Example 1

The preparation method comprises the following steps of based on the weight of the formula in the table 1:

(1) uniformly mixing deionized water, xonotlite type calcium silicate, kaolin and rutile type titanium dioxide, adding a half of wetting agent, a half of defoaming agent and a proper amount of dispersing agent into the mixture, uniformly stirring, and preparing slurry by mechanical dispersion and ultrasonic dispersion in sequence;

s2, firstly, placing the acrylic resin emulsion into a lifting dispersion stirrer for stirring, then adding the slurry prepared in the step S1 into the stirred acrylic resin emulsion, keeping the stirring state, adding the other half of wetting agent, the rest of dispersing agent, the other half of defoaming agent, film-forming auxiliary agent, mildew preventive and leveling agent, and mechanically stirring at the low-speed stirring speed of 450r/min for 60 min;

s3, uniformly dispersing the slurry stirred at the low speed in the step S2 under the action of a high-speed dispersing machine, wherein the stirring speed of the high-speed dispersing agent is 1500r/min, and the stirring time is 80 min;

s4, adding ammonia water to adjust the pH value of the solution prepared in the step S3 to be 9;

and S5, stirring the solution in the step S4 at a low speed again, adding a thickening agent in the stirring process, and performing ball milling operation to prepare the heat-preservation and heat-insulation coating, wherein the low-speed stirring speed is 400r/min, and the stirring time is 30 min.

Example 2

s2, firstly, placing the acrylic resin emulsion into a lifting dispersion stirrer for stirring, then adding the slurry prepared in the step S1 into the stirred acrylic resin emulsion, keeping the stirring state, adding the other half of wetting agent, the rest of dispersing agent, the other half of defoaming agent, film-forming auxiliary agent, mildew preventive and leveling agent, and mechanically stirring at a low-speed stirring speed of 400r/min for 50 min;

s3, uniformly dispersing the slurry stirred at the low speed in the step S2 under the action of a high-speed dispersing machine, wherein the stirring speed of the high-speed dispersing agent is 1400r/min, and the stirring time is 60 min;

s4, adding ammonia water to adjust the pH value of the solution prepared in the step S3 to be 8;

and S5, stirring the solution in the step S4 at a low speed again, adding a thickening agent in the stirring process, and performing ball milling operation to prepare the heat-preservation and heat-insulation coating, wherein the low-speed stirring speed is 350r/min, and the stirring time is 35 min.

Example 3

s2, firstly, placing the acrylic resin emulsion into a lifting dispersion stirrer for stirring, then adding the slurry prepared in the step S1 into the stirred acrylic resin emulsion, keeping the stirring state, adding the other half of wetting agent, the rest of dispersing agent, the other half of defoaming agent, film-forming auxiliary agent, mildew preventive and leveling agent, and mechanically stirring at a low-speed stirring speed of 500r/min for 45 min;

s3, uniformly dispersing the slurry stirred at the low speed in the step S2 under the action of a high-speed dispersing machine, wherein the stirring speed of the high-speed dispersing agent is 1600r/min, and the stirring time is 50 min;

s4, adding ammonia water to adjust the pH value of the solution prepared in the step S3 to be 10;

and S5, stirring the solution in the step S4 at a low speed again, adding a thickening agent in the stirring process, and performing ball milling operation to prepare the heat-preservation and heat-insulation coating, wherein the low-speed stirring speed is 420r/min, and the stirring time is 25 min.

The auxiliary agent is an indispensable component of the heat-insulating coating, although the dosage of the auxiliary agent is probably only a few thousandths to a few percent, the auxiliary agent has certain influence on the production process, the product quality, the stable storage, the convenient construction, the film coating performance and the like.

The auxiliary agent in the invention comprises one or more of a dispersing agent, a wetting agent, a film forming auxiliary agent, a thickening agent, a defoaming agent, a mildew preventive and a flatting agent. The dispersing agent is an SD-101 powerful dispersing agent, the wetting agent is an SD-200 water-based wetting agent, the film-forming aid is an SD-505 film-forming aid, the thickening agent is an SD-301 multifunctional thickening agent, the defoaming agent is an SD-202 water-based defoaming agent or a polymer type defoaming agent, the mildew preventive is an SD-100 sterilization mildew preventive, and the leveling agent is a KX-2020 pure leveling agent.

Preferably, the auxiliary is an auxiliary that matches the acrylic resin emulsion, that is, the auxiliary does not adversely react with the emulsion.

The emulsion includes one or more of a silicone-acrylic resin, an acrylic resin, and an epoxy resin. The refractive index is usually used for representing the strength of sunlight reflected by a substance, and the refractive index of the synthetic resin is 1.45-1.50, so that the influence of different synthetic resins on the solar heat reflection effect of the coating is not obvious. The organic resin has small difference of absorptivity, and can be selected from synthetic resin with high transparency, no or little endothermic group and small absorption to visible light and near infrared light as base material. More preferably, the heat-insulating coating selects acrylic emulsion, has good transparency and lower refractive index, and does not contain endothermic groups per se; meanwhile, the coating has good water resistance, weather resistance and adhesive force, is safe and environment-friendly, is simple and convenient to construct, and is suitable for building heat insulation coatings.

The content of other components is kept unchanged in the emulsion, alkaline earth metal composite salts with different doping amounts (0-12%) are added to prepare the coating, xonotlite-type calcium silicate is selected for testing the heat-insulating property of the coating, the test result is shown in figure 2, and figure 2 is a graph showing the influence of different doping amounts of xonotlite-type calcium silicate on the heat-insulating property of the coating. As can be seen from fig. 2: as the addition amount of the xonotlite-type calcium silicate increases, the K value decreases, and the heat insulating property of the coating layer improves, but the improvement degree of the heat insulating property becomes gradual as the addition amount becomes higher. When the addition amount is more than 9 percent, the K value approaches to 66 ℃, and the heat insulation performance of the coating tends to be stable. The xonotlite type calcium silicate hollow particles are dispersed in the coating, and micro bubbles are formed in the coating after the coating is cured, so that the heat conductivity coefficient of the coating is reduced, and the heat insulation performance is improved. As the amount of incorporation increases, the more microbubbles are introduced, the better the thermal insulation properties of the coating. The xonotlite type calcium silicate hollow particles have the characteristics of large specific surface area and easy spontaneous aggregation, for example, if xonotlite type calcium silicate is continuously added, the dispersion state cannot be effectively improved, and the spontaneous aggregation of the hollow particles can cause the micro-bubble distribution in the coating to be uneven, so that the heat insulation performance of the coating cannot be obviously improved. Therefore, the xonotlite type calcium silicate can improve the heat-insulating property of the coating, the heat-insulating property of the coating is gradually improved along with the increase of the doping amount of the xonotlite type calcium silicate, and the heat-insulating property tends to be stable when the doping amount is more than 9 percent.

Pigments are primarily responsible for providing hiding power and decorative properties. The primary requirement is to have as high a hiding power as possible and a brilliant color, and furthermore, the stability and ease of dispersibility of the pigments should be noted. For the external wall heat insulation coating, white pigment is generally adopted, so that titanium dioxide is selected as the white pigment, and the covering power is strong.

The titanium dioxide can be rutile titanium dioxide or anatase titanium dioxide. Rutile titanium dioxide, although having the highest scattering power, is relatively expensive and, if its particles agglomerate, affects the exertion of its covering power. Extender pigments, such as kaolin, have substantially the same refractive index as latex polymers and therefore do not have hiding power. But the fine extender pigment can adjust the spatial position of the titanium dioxide in the coating film, so that the titanium dioxide is not agglomerated, the maximum light scattering capacity is achieved, and the highest covering power is obtained. The coarse extender pigment causes the titanium dioxide to be aggregated in the particle gaps, so that the covering power of the titanium dioxide is reduced. When the particle size of the extender pigment is 4 times of that of the titanium dioxide, the space position effect is obvious, and the titanium dioxide can obtain the most effective light scattering. Under the condition that other components of the heat-insulating coating are not changed, rutile type titanium dioxide and anatase type titanium dioxide are respectively used as functional fillers to prepare the coating, the heat-insulating property of the coating is tested, the test result is shown in figure 3, figure 3 is a graph showing the influence of different crystal type titanium dioxide on the heat-insulating property of the coating, in the graph, a curve 1 shows the influence of adding rutile type titanium dioxide on the heat-insulating property of the coating, and a curve 2 shows the influence of anatase type titanium dioxide on the heat-insulating property of the coating. As can be seen from FIG. 3, under the same conditions, the temperature values of the two types of titanium dioxide added are both reduced, but the temperature value of the curve 1 is lower than that of the curve 2, which shows that the heat-insulating properties of the two types of titanium dioxide on the coating film are both improved, and the heat-insulating properties of the coating film added with rutile type titanium dioxide are obviously better than those of the coating film added with anatase type titanium dioxide. By comparing the performance parameters of the rutile titanium dioxide and the anatase titanium dioxide, the rutile titanium dioxide has a compact crystal structure and a large relative density, and the covering power is better than that of the anatase 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. The powdering resistance and the light stability of the rutile titanium dioxide are superior to those of anatase titanium dioxide, so the rutile titanium dioxide in the component is preferably the rutile titanium dioxide.

The heat-insulating filler alkaline earth metal composite salt is added into the coating in the form of slurry and solid powder (sieved by a 120-mesh sieve), and the addition amount of the xonotlite type calcium silicate is 4% respectively, so as to study the influence of different heat-insulating filler addition states on the heat-insulating performance of a coating. The heat insulating property of the coating was tested, and the test result is shown in fig. 4, fig. 4 is a graph showing the influence of different adding states of the xonotlite-type calcium silicate on the heat insulating property of the coating, and the heat insulating property of the coating is better when the alkaline earth metal composite salt is added into the coating in a slurry manner than when the alkaline earth metal composite salt is added into the coating in a solid particle manner. Fig. 5 is SEM images of different charging states of the xonotlite-type calcium silicate, and it can be seen from fig. 5 that the xonotlite-type calcium silicate particles added to the emulsion in the form of slurry (left side of fig. 5) are intact in morphology and well dispersed. On the other hand, since the particle structure is easily broken by mechanical force during polishing of the dried xonotlite-type calcium silicate, the addition of the filler in the form of a solid (right-hand side of fig. 5) does not have a hollow structure of the xonotlite-type calcium silicate particles, and thus does not provide a heat insulating effect in the coating material.

The heat-insulating coating is used for carrying out internal coating and external coating application tests on a wall, quantifiable energy-saving performance indexes are realized, the equivalent thermal resistance value of the internal coating of the wall is more than or equal to 0.88 (square meter. K)/W, and the equivalent thermal resistance value of the external coating of the wall is more than or equal to 0.78 (square meter. K)/W.

According to the law of thermal radiation 4, the earth can exchange energy with outer space in a specific wave band of 8-14 μm (atmospheric window). The heat-insulating coating has the components in special proportion and a production process, so that the heat flow density of the building wall enclosure structure can be reduced, the heat transfer is reduced, and the heat-insulating coating has a good heat-insulating effect.

The heat-insulating coating has obvious effects of saving energy and reducing consumption. The annual electric quantity is 432 ten thousand kW.h, the annual electric charge is 302 ten thousand yuan, which is equivalent to the standard coal 1382.4 tce; the annual emission reduction amount of CO2 is 3240 tons, and the environmental benefit is better.

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, data are acquired by performing an outdoor pilot engineering application actual measurement method according to the stipulation of the industrial standard 'residential building energy-saving detection standard' JGJ/T132-supplement 2009: after the inner and outer surfaces of the 490mm thick solid brick gas wall were coated with the thermal insulation coatings, respectively, the heat fluxes of the bare wall, the inner and outer coated thermal insulation coatings were tested, and are shown in fig. 6, the curves of the bare wall heat flux and the inner and outer surface temperatures, the curves of the wall heat flux and the inner and outer surface temperatures, fig. 7, and the curves of the wall heat flux and the inner and outer surface temperatures, respectively, of the outer coated thermal insulation coating, respectively.

As can be seen from fig. 6, 7 and 8: after the building forms stable heat transfer indoors and outdoors, and under the condition that the temperatures on two sides of the wall body are basically kept unchanged, after the coating is coated inside and outside the outer wall, the heat flux in the wall body is obviously reduced compared with that of a bare wall.

This measurement shows that: 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.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The heat-insulating coating is characterized by comprising the following raw materials, by mass, 8-20 parts of deionized water, 30-40 parts of acrylic resin emulsion, 1-12 parts of xonotlite type calcium silicate, 1-9 parts of kaolin, 5-30 parts of rutile type titanium dioxide, 0.1-0.8 part of a defoaming agent, 2-5 parts of a film-forming aid, 0.2-0.4 part of a mildew inhibitor, 0.3-0.6 part of a leveling agent, 1-2 parts of a dispersing agent, 1-2 parts of a wetting agent and 1-3 parts of a thickening agent, wherein the sum of the components is 100 parts.

2. The heat-insulating and heat-insulating coating as claimed in claim 1, wherein the defoaming agent is a polymer type defoaming agent.

3. The heat-insulating coating as claimed in claim 1, which comprises the following raw materials, by mass, 8 parts of deionized water, 35 parts of acrylic resin emulsion, 11 parts of xonotlite-type calcium silicate, 7 parts of kaolin, 28 parts of rutile titanium dioxide, 0.2 part of a defoaming agent, 5 parts of a film-forming aid, 0.3 part of a mildew inhibitor, 0.5 part of a leveling agent, 1 part of a dispersant, 1 part of a wetting agent and 3 parts of a thickener.

4. The heat-insulating coating as claimed in claim 1, which comprises the following raw materials, by mass, 14 parts of deionized water, 33 parts of acrylic resin emulsion, 10 parts of xonotlite-type calcium silicate, 8 parts of kaolin, 25 parts of rutile titanium dioxide, 0.4 part of a defoaming agent, 5 parts of a film-forming aid, 0.4 part of a mildew inhibitor, 0.2 part of a leveling agent, 1 part of a dispersant, 2 parts of a wetting agent and 1 part of a thickener.

5. The heat-insulating coating as claimed in claim 1, which comprises the following raw materials, by mass, 18 parts of deionized water, 35 parts of acrylic resin emulsion, 9 parts of xonotlite-type calcium silicate, 7 parts of kaolin, 25 parts of rutile titanium dioxide, 0.6 part of a defoaming agent, 2 parts of a film-forming aid, 0.2 part of a mildew preventive, 0.2 part of a leveling agent, 1 part of a dispersant, 1 part of a wetting agent and 1 part of a thickener.

6. A preparation method of the heat preservation and insulation coating as claimed in any one of claims 1 to 5, characterized by comprising the following steps:

7. The preparation method of the heat preservation and insulation coating as claimed in claim 6, wherein in the step S2, the low-speed stirring speed is 450r/min, and the stirring time is 60 min.

8. The preparation method of the heat-preservation and heat-insulation coating as claimed in claim 6, wherein the stirring speed of the high-speed dispersant in the step S3 is 1500r/min, and the stirring time is 80 min.

9. The preparation method of the heat-preservation and heat-insulation coating according to claim 6, wherein the ammonia water in the step S4 is adjusted to have a pH value of 8-10.

10. The preparation method of the heat preservation and insulation coating as claimed in claim 6, wherein in the step S5, the low-speed stirring speed is 400r/min, and the stirring time is 30 min.