CN102352159B - Water-based phase-change microspherical thermal-insulation paint for internal walls and preparation method thereof - Google Patents

Abstract

The invention discloses a water-based phase-change microsphere interior wall thermal insulation coating, which is characterized in that it comprises the following components in weight percentage: 20-40% of acrylic emulsion, 0.1-5% of wetting agent, 0.1-5% of dispersant, silicon Alginate 5~20%, paraffin phase change microspheres 5~10%, titanium dioxide 5~20%, thickener 0.1~5%, kaolin 1~10%, opaque polymer 3~10%, the balance is water . Due to the introduction of the paraffin phase change microsphere material, the present invention has good thermal insulation effect, excellent weather resistance, can effectively resist cracks, and fundamentally solves the problem that the thermal insulation coating is easily restricted by the atmospheric environment, coating and wave band, etc., and the application is very widely.

Description

A kind of water-based phase change microsphere interior wall thermal insulation coating and preparation method thereof

technical field

The invention relates to the field of thermal insulation coatings, in particular to a water-based phase-change microsphere interior wall thermal insulation coating used on the inner wall surface of a building and a preparation method thereof.

Background technique

Saving energy, reducing consumption, and improving economic benefits are one of the basic goals of scientific research and technology development, and coating technology is no exception. After the 1970s, the world's climate became warmer, and the earth's energy sources were increasingly exhausted. Therefore, it is of great practical significance to develop thermal insulation coatings, especially building thermal insulation coatings that are closely related to human life. In my country's energy consumption, building energy consumption accounts for about 1/4 of the country's energy consumption, while building insulation materials account for about 11% of the total. It can be seen that building energy conservation has great potential. Under the background of vigorously popularizing thermal insulation materials in foreign countries, it can be predicted that my country will gradually introduce laws and regulations that require thermal insulation measures for new houses.

At present, thermal insulation coatings mainly adopt mechanisms and modes such as adjusting the absorption/radiation ratio of the coating, increasing the thermal resistance of the coating, and cooling by infrared radiation. However, in actual use, the coating is too thick and the temperature control effect is affected by the atmosphere and dust. Disadvantages such as impact, different temperature control effects on different bands, etc. In response to the above problems, people are actively looking for thermal insulation coatings based on other mechanisms and modes.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a water-based phase-change microsphere interior wall thermal insulation coating and its preparation method, aiming at solving the problem of poor thermal insulation effect, poor crack resistance, water resistance and weather resistance in the prior art. Poor performance, easy to be restricted by atmospheric environment, coating and wave band.

Technical scheme of the present invention is as follows:

A water-based phase-change microsphere interior wall thermal insulation coating, wherein the water-based phase-change microsphere interior wall thermal insulation coating is mainly composed of the following components by weight percentage:

Acrylic emulsion 20~40%, wetting agent 0.1~5%, dispersant 0.1~5%, diatomaceous earth 5~20%, paraffin phase change microsphere 5~10%, titanium dioxide 5~25%, thickener 0.1~5%, kaolin 1~10%, opaque polymer 3~10%, the balance is water.

The water-based phase-change microsphere interior wall thermal insulation coating, wherein the paraffin phase-change microspheres are composed of encapsulated paraffin and a polymer shell; the paraffin is encapsulated in the polymer shell.

The water-based phase-change microsphere interior wall thermal insulation coating, wherein, the average diameter of the paraffin phase-change microspheres is 6-45 microns.

The water-based phase change microsphere interior wall thermal insulation coating, wherein the opaque polymer is a hollow polymer sphere;

The shell of the hollow polymer sphere is a polymer composed of acrylate and styrene.

In the water-based phase-change microsphere interior wall thermal insulation coating, the wetting agent is a polyoxyethylene ether wetting agent.

In the water-based phase change microsphere interior wall thermal insulation coating, the dispersant is a high molecular weight polyacrylate ammonium salt dispersant.

The water-based phase-change microsphere interior wall thermal insulation coating, wherein the titanium dioxide is rutile titanium dioxide.

In the water-based phase-change microsphere interior wall thermal insulation coating, the thickener is an alkali-swellable thickener and a hydrophobically modified polyurethane thickener.

The water-based phase-change microsphere interior wall thermal insulation coating, wherein, the water-based phase-change microsphere interior wall thermal insulation coating also includes: 1-5% of other additives;

The auxiliary agent is one or more of antifungal agents, preservatives, antibacterial agents or antifreeze agents.

The preparation method of above-mentioned water-based phase-change microsphere interior wall thermal insulation coating, wherein, the preparation method of described water-based phase-change microsphere interior wall thermal insulation coating comprises the following steps:

First, weigh the raw materials according to the formula ratio, add part of the water and all the wetting agent, dispersant, rutile titanium dioxide, diatomaceous earth and kaolin in the low-speed stage, and stir at a medium speed; add part of the hydrophobic modified polyurethane thickener After the above raw materials are added, disperse at high speed; continue to stir at medium speed, add acrylic emulsion, paraffin phase change microspheres, opaque polymer, alkali swelling thickener and the remaining hydrophobic modified polyurethane thickener, the remaining water and other ingredients, stirred at medium speed, filtered, weighed and packaged.

Beneficial effects: the water-based phase-change microsphere thermal insulation coating and its preparation method provided by the present invention, due to the introduction of paraffin phase-change microsphere material, has good thermal insulation effect, excellent weather resistance, can effectively resist cracks, and improves the thermal insulation capacity of the wall , saves energy consumption, improves comfort, and fundamentally solves the problem that thermal insulation coatings are easily restricted by the atmospheric environment, coatings and wave bands, and is widely used.

Description of drawings

Fig. 1 is the test graph of the thermal insulation performance of the water-based phase change microsphere thermal insulation coating of the present invention.

Detailed ways

The present invention provides a water-based phase-change microsphere interior wall thermal insulation coating and a preparation method thereof. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Using the latent heat storage function of phase change materials to achieve building temperature regulation, waste heat storage, auxiliary heat storage, and solar energy storage and utilization is currently one of the most effective methods and research directions for building energy saving. Microcapsule technology is a technology that uses film-forming materials to coat liquids or solids to form micron or millimeter particles. The particles formed by coating the microcapsules with phase change materials are called phase change material microcapsules, which have a special function of temperature regulation. The phase change material of the microcapsule core can change phase with the external temperature, but the polymer film coated on the surface remains solid. When the ambient temperature rises, when the temperature is higher than the phase transition temperature, the phase change material in the capsule absorbs the heat in the environment and undergoes a phase transition until all of it changes from solid to liquid; while when the ambient temperature is lower than the phase transition temperature , the phase change material of the capsule core releases the absorbed heat, and a liquid-solid phase transition occurs. This heat absorption and heat release function can keep the temperature of the microcapsule surface relatively constant within a certain period of time. The advantages of the microcapsule phase change material are to reduce or avoid the reaction between the phase change material and the environment, increase the heat transfer area, and ensure that the phase change occurs in the wall material. Due to the unique thermal properties of thermal insulation coatings based on phase change materials, it is the cheapest and easiest way to impart temperature regulation to objects. Such thermal insulation coatings have a huge market demand. With the maturity of thermal insulation coating technology, the method of completely replacing the thermal insulation layer with thermal insulation coating has begun to enter the practical stage, which will change the traditional thermal insulation and cold preservation methods. The application of thermal insulation coating technology on vehicles, ships, oil (gas) tanks, refrigeration equipment and air-conditioning equipment will greatly reduce the thickness of the thermal insulation layer and simplify the construction process, improve energy efficiency, and save the volume and equipment used for thermal insulation. space.

The invention introduces the phase change material into the thermal insulation coating for interior walls to prepare a temperature control coating based on the phase change mechanism, thereby fundamentally solving the problem that the thermal insulation coating is restricted by the atmospheric environment, coating and wave band. The phase transition process has two characteristics: it is accompanied by a large amount of latent heat and the temperature remains constant. Phase change materials are divided into two categories: solid-solid phase change materials and solid-liquid phase change materials. Solid-solid phase change materials are mainly cross-linked crystalline polymers, such as polyolefins and polyethylene glycols, which are characterized by maintaining a solid state during the phase transition process and having a high phase transition temperature. Solid-liquid phase change materials include hydrated inorganic salts, hydrocarbons, higher fatty acids and higher fatty alcohols, which are characterized by large phase change heat, suitable phase change temperature and liquefaction during the phase change process. Since the phase transition temperature of the solid-solid phase change material is high, it is difficult to realize at room temperature. Therefore, the present invention adopts the solid-liquid phase change material, specifically paraffin phase change microspheres. It is a small spherical thermoplastic particle. When the external temperature rises, the solid paraffin absorbs heat, and a phase transition occurs after the heat absorption is sufficient, and the solid paraffin is converted into liquid paraffin; when the external temperature decreases, the liquid paraffin releases heat, releasing enough heat. Then a phase transition occurs, and the liquid paraffin turns into a solid. This heat-absorbing and exothermic function can keep the temperature of the surface of the paraffin phase-change microsphere relatively constant within a certain period of time.

The paraffin phase-change microspheres used in the water-based phase-change microsphere interior wall thermal insulation coating of the present invention are composed of encapsulated paraffin wax and a polymer shell, that is, the polymer shell wraps and encapsulates the paraffin wax to form the paraffin phase-change microspheres. The polymer shell is composed of melamine resin or acrylic resin, which has good film-forming property and good chemical stability, not only has good toughness and impermeability, but also has good wear resistance, water resistance and heat resistance. The paraffin phase-change microspheres of the present invention can prevent the leakage problem caused by the conversion of paraffin wax from solid to liquid, and effectively protect the chemical properties of paraffin wax due to the isolation of encapsulated paraffin wax from other substrates, and the phase-change microspheres also It has the advantages of excellent elasticity, light weight, chemical resistance, low air permeability, good mechanical strength, etc., and is very suitable for architectural coatings.

The average diameter of the paraffin phase-change microspheres used in the water-based phase-change microsphere interior wall thermal insulation coating of the present invention is 6-45 microns, which can effectively increase the specific surface area and thermal conductivity of the paraffin phase-change microspheres, so that the paraffin can quickly sense temperature. The endothermic and exothermic processes are carried out by changing the heat, which also enhances the heat storage capacity of the paraffin phase change microspheres, and further improves the thermal insulation performance of the coating.

The present invention can control the phase change temperature by adjusting the paraffin carbon chain length in the paraffin phase change microspheres. The phase change temperature of the paraffin phase change microspheres used in the present invention is about 20-25°C, and the phase change enthalpy>100J/g. Applicable to most places, that is, when the external temperature is higher than the phase transition temperature, the paraffin absorbs heat and undergoes a phase transition, and the solid paraffin is converted into liquid paraffin; when the external temperature is lower than the phase transition temperature, the paraffin releases heat and undergoes a phase transition. The liquid paraffin is converted into solid paraffin, so that the external temperature is kept near the phase transition temperature for a certain period of time.

The water-based phase change microsphere interior wall thermal insulation coating of the present invention is mainly composed of the following components in terms of weight percentage:

Acrylic emulsion 20~40%, wetting agent 0.1~5%, dispersant 0.1~5%, diatomaceous earth 5~20%, paraffin phase change microsphere 5~10%, titanium dioxide 5~25%, thickener 0.1~5%, kaolin 1~10%, opaque polymer 3~10%, the balance is water.

The following components can also be included in the water-based phase change microsphere interior wall thermal insulation coating:

Other coating additives (such as antifungal agents, preservatives, antibacterial agents, antifreeze agents, etc.) 1 to 5%.

The acrylic emulsion used in the water-based phase-change microsphere interior wall thermal insulation coating of the present invention is a polymerized emulsion, which has excellent elasticity and good stain resistance, and the formed coating film can effectively resist cracks and has excellent weather resistance.

Kaolin which can effectively reduce the bulk density and thermal conductivity of the coating is added to the water-based phase-change microsphere interior wall thermal insulation coating of the present invention. Because kaolin itself has low thermal conductivity, and has a microporous structure, low density, good mechanical properties, and strong hydrophobicity, it can effectively reduce the bulk density of the coating and lock more still air inside the coating when forming a film. Thereby effectively reducing the thermal conductivity of the coating and blocking the heat convection of the air. This greatly enhances the thermal insulation effect of the coating.

The opaque polymer used in the water-based phase-change microsphere interior wall thermal insulation coating of the present invention is preferably a hollow polymer sphere, and the shell of the sphere is a polymer composed of acrylate and styrene. The glass transition temperature of the polymer is very high. Polymer spheres can provide hiding power, can replace part of titanium dioxide, and do not participate in film formation. The opaque polymer used in the water-based phase change microsphere interior wall thermal insulation coating of the present invention has excellent covering performance and can improve the water resistance and weather resistance of the coating film.

The titanium dioxide used in the water-based phase-change microsphere interior wall thermal insulation coating of the present invention is preferably rutile-type titanium dioxide, which has the characteristics of high gloss, excellent covering and dispersing properties, and the like.

The diatomite used in the water-based phase change microsphere interior wall thermal insulation coating of the present invention has good heat insulation, filling and dispersion properties, and can further improve the performance of the thermal insulation coating of the present invention.

The wetting agent used in the water-based phase change microsphere interior wall thermal insulation coating of the present invention is preferably a polyoxyethylene wetting agent.

The dispersant used in the water-based phase-change microsphere interior wall thermal insulation coating of the present invention is a high-molecular-weight polyacrylic acid ammonium salt dispersant.

The thickeners used in the water-based phase-change microsphere interior wall thermal insulation coating of the present invention are mainly alkali-swellable thickeners and hydrophobically modified polyurethane thickeners.

The water-based phase-change microsphere interior wall thermal insulation coating of the present invention also includes additives, and the additives are mainly composed of one or more of antifungal agents, preservatives, antibacterial agents or antifreeze agents.

The manufacture method of water-based phase change microsphere interior wall thermal insulation coating of the present invention:

First, weigh the raw materials according to the proportion of the formula, add part of the water and all the wetting agent, dispersant, rutile titanium dioxide, diatomaceous earth and kaolin in the low-speed stage, and stir at a medium speed for 3~5min; add part of the hydrophobic modified polyurethane Thickener, after the above raw materials are added, disperse at high speed for 15 minutes; continue to stir at medium speed, add acrylic emulsion, paraffin phase change microspheres, opaque polymer, alkali swelling thickener and the remaining hydrophobic modified polyurethane thickener Thickener, remaining water and other ingredients, then stirred at a medium speed for 15 minutes, then filtered, weighed and packaged.

Wherein, the low-speed stirring means that the rotating speed of the stirring blade is between 500 rpm and 800 rpm, the high-speed stirring means that the rotating speed of the stirring blade is between 1000 rpm and 1500 rpm, and the medium-speed stirring is It means that the rotation speed of the stirring blade is between 800 rpm and 1000 rpm.

The water-based phase-change microsphere interior wall thermal insulation paint provided by the invention has no harm to the human body and the environment due to the use of the water-based emulsion, and belongs to the green environmental protection product. The product has the characteristics of slow heating when heating and slow cooling when cooling. In the hot summer in the south, the coating can effectively block heat transfer from the wall into the room, keeping the room at a relatively low temperature; The loss of heat, and when the indoor temperature drops, it can slowly release heat energy to make up for the loss of heat. That is, the indoor temperature can be moderately adjusted to make the living environment more comfortable. The product is very convenient to construct, and can provide a variety of color options by adding different other color pastes, and has good decorative and protective functions.

Below, preferred embodiment of the present invention is described further:

Embodiment one:

Specific implementation method: a new type of thermal insulation coating, its formula ratio is (percentage by weight):

Deionized water: 32.8 Opaque Polymer: 5 Dispersant: 0.5 Alkali-swellable thickener: 0.2 Rutile titanium dioxide: 10 Hydrophobic modified polyurethane thickener: 1 Kaolin: 3 Paraffin phase change microspheres: 10 Diatomaceous earth: 5 Humectant: 0.5 Acrylic emulsion: 29.5 Other additives: 2.5

First, weigh the raw materials according to the formula ratio, add 15 parts of deionized water, 0.5 parts of wetting agent, 0.5 parts of dispersing agent, 10 parts of rutile titanium dioxide, 5 parts of diatomaceous earth and 3 parts of kaolin in the low-speed stage, and stir at medium speed for 3 ~5 minutes, add 0.5 parts of hydrophobic modified polyurethane thickener, after the above raw materials are added, disperse at high speed for 15 minutes, then continue stirring at medium speed, add 29.5 parts of acrylic emulsion, 10 parts of paraffin phase change microspheres, 5 parts of opaque polymer 1 part, 0.2 part of alkali-swellable thickener and 0.5 part of hydrophobically modified polyurethane thickener, the remaining water and other ingredients, stirred at a medium speed for 15 minutes, filtered, weighed and packaged.

Embodiment two:

Specific implementation method: a new type of thermal insulation coating, its formula ratio is (percentage by weight):

Deionized water: 31.3 Opaque Polymer: 3 Dispersant: 0.5 Alkali-swellable thickener: 0.2 Rutile titanium dioxide: 10 Hydrophobic modified polyurethane thickener: 1 Kaolin: 1 Paraffin phase change microspheres: 8 Diatomaceous earth: 10 Humectant: 0.5 Acrylic emulsion: 31.5 Other additives: 2.5

Firstly weigh the raw materials according to the proportion of the formula, add 15 parts of deionized water, 0.5 parts of wetting agent, 0.5 parts of dispersing agent, 10 parts of rutile titanium dioxide, 10 parts of diatomite and 1.5 parts of kaolin in the low-speed stage, and stir at medium speed for 3 ~5 minutes, add 0.5 parts of hydrophobic modified polyurethane thickener, after the above raw materials are added, disperse at high speed for 15 minutes, then continue stirring at medium speed, add 31.5 parts of acrylic emulsion, 8 parts of paraffin phase change microspheres, 3 parts of opaque polymer 1 part, 0.2 part of alkali-swellable thickener and 0.5 part of hydrophobically modified polyurethane thickener, the remaining water and other ingredients, and stirred at a medium speed for 15 minutes, then filtered, weighed and packaged.

Embodiment three:

Specific implementation method: a new type of thermal insulation coating, its formula ratio is (percentage by weight):

Deionized water: 25.8 Opaque Polymer: 10 Dispersant: 0.5 Alkali-swellable thickener: 0.2 Rutile titanium dioxide: 12 Hydrophobic modified polyurethane thickener: 1 Kaolin: 1 Paraffin phase change microspheres: 5 Diatomaceous earth: 8 Humectant: 0.5 Acrylic emulsion: 33.5 Other additives: 2.5

First weigh the raw materials according to the formula ratio, add 15 parts of deionized water, 0.5 parts of wetting agent, 0.5 parts of dispersing agent, 12 parts of rutile titanium dioxide, 8 parts of diatomaceous earth and 1 part of kaolin in the low-speed stage, and stir at medium speed for 3 ~5 minutes, add 0.5 parts of hydrophobic modified polyurethane thickener, after the above raw materials are added, disperse at high speed for 15 minutes, then continue stirring at medium speed, add 33.5 parts of acrylic emulsion, 5 parts of paraffin phase change microspheres, and 10 parts of opaque polymer 1 part, 0.2 part of alkali-swellable thickener and 0.5 part of hydrophobically modified polyurethane thickener, the remaining water and other ingredients, and stirred at a medium speed for 15 minutes, then filtered, weighed and packaged.

Embodiment four:

Specific implementation method: a new type of thermal insulation coating, its formula ratio is (percentage by weight):

Deionized water: 20 Opaque Polymer: 5 Dispersant: 0.5 Alkali-swellable thickener: 0.2 Rutile titanium dioxide: 5 Hydrophobic modified polyurethane thickener: 0.5 Kaolin: 2 Paraffin phase change microspheres: 5 Diatomaceous earth: 20 Humectant: 0.5 Acrylic emulsion: 40 Other additives: 1.3

First weigh the raw materials according to the formula ratio, add 15 parts of deionized water, 0.5 parts of wetting agent, 0.5 parts of dispersant, 10 parts of rutile titanium dioxide, 20 parts of diatomite and 2 parts of kaolin in the low-speed stage, and stir at medium speed for 3 ~5 minutes, add 0.5 parts of hydrophobic modified polyurethane thickener, after the above raw materials are added, disperse at high speed for 15 minutes, then continue to stir at medium speed, add 40 parts of acrylic emulsion, 5 parts of paraffin phase change microspheres, and 5 parts of opaque polymer part, 0.2 part of alkali-swellable thickener, remaining water and other ingredients, and stirred at a medium speed for 15 minutes, then filtered, weighed and packaged.

Embodiment five:

Specific implementation method: a new type of thermal insulation coating, its formula ratio is (percentage by weight):

Deionized water: 40 Opaque Polymer: 5 Dispersant: 0.5 Alkali-swellable thickener: 0.2 Rutile titanium dioxide: 5 Hydrophobic modified polyurethane thickener: 0.5 Kaolin: 10 Paraffin phase change microspheres: 5 Diatomaceous earth: 12 Humectant: 0.5 Acrylic emulsion: 20 Other additives: 1.3

First, weigh the raw materials according to the formula ratio, add 15 parts of deionized water, 0.5 parts of wetting agent, 0.5 parts of dispersing agent, 10 parts of rutile titanium dioxide, 12 parts of diatomite and 10 parts of kaolin in the low-speed stage, and stir at medium speed for 3 ~5 minutes, add 0.5 parts of hydrophobic modified polyurethane thickener, after the above raw materials are added, disperse at high speed for 15 minutes, then continue stirring at medium speed, add 20 parts of acrylic emulsion, 5 parts of paraffin phase change microspheres, and 5 parts of opaque polymer part, 0.2 part of alkali-swellable thickener, remaining water and other ingredients, and stirred at a medium speed for 15 minutes, then filtered, weighed and packaged.

Embodiment six:

Specific implementation method: a new type of thermal insulation coating, its formula ratio is (percentage by weight):

Deionized water: 29.5 Opaque Polymer: 5 Dispersant: 5 Alkali-swellable thickener: 0.1 Rutile titanium dioxide: 25 Hydrophobic modified polyurethane thickener: 0.1 Kaolin: 2 Paraffin phase change microspheres: 5 Diatomaceous earth: 5 Humectants: 2 Acrylic emulsion: 20 Other additives: 1.3

First weigh the raw materials according to the formula ratio, add 15 parts of deionized water, 2 parts of wetting agent, 5 parts of dispersant, 25 parts of rutile titanium dioxide, 5 parts of diatomite and 2 parts of kaolin in the low-speed stage, and stir at medium speed for 3 ~5 minutes, add 0.1 part of hydrophobic modified polyurethane thickener, after the above raw materials are added, disperse at high speed for 15 minutes, then continue stirring at medium speed, add 20 parts of acrylic emulsion, 5 parts of paraffin phase change microspheres, and 5 parts of opaque polymer 1 part, 0.1 part of alkali-swellable thickener, remaining water and other ingredients, stirred at a medium speed for 15 minutes, filtered, weighed and packaged.

Insulation performance test method:

1) Coat the ordinary coating and the phase-change microsphere thermal insulation coating on the walls of the same two 4L iron tanks, with the same dry thickness of 100??m and the same coating area, and test after a week of self-drying;

2) Heat the two iron cans in a 50°C incubator for 1 hour to stabilize the air temperature in the cans. Take out the iron can, seal the lid tightly, place the iron can in a 15°C incubator, and measure the temperature change of the air in the can.

Table 1 Changes of air temperature in tanks of common paint and phase change microsphere thermal insulation paint

Taking ordinary coatings as a comparative example, the thermal insulation performance test was carried out with the phase change microsphere thermal insulation coatings of Examples 1-6, and the test results are shown in Table 1. Make a schematic diagram with the data of Example 1 and the comparative example of common paint, as shown in Figure 1.

Insulation performance test results:

As can be seen from the test results shown in Table 1 and Figure 1, as time increases, the air temperatures in the seven tanks all show a downward trend. The decline rate of phase change coatings is lower than that of ordinary coatings, especially around 25°C, and the air temperature in the tank of phase change coatings lasts significantly longer around this temperature. This is because the temperature of the air in the tank and the temperature of the paint are saturated after two different paints are placed in a constant temperature box at 50°C for 1 hour, but the paraffin wax of the phase change microspheres changes from solid to liquid at this temperature, and the storage time is longer. Lots of heat. Put the temperature-saturated iron tank in a lower temperature environment, the heat in the tank will start to lose, and the air temperature will gradually drop. Since the phase change coating itself absorbs more heat, the temperature drops more slowly. Around 25°C is the phase transition point of paraffin wax from liquid phase to solid phase, and the heat released at this temperature is the most, so the air temperature is relatively stable around this temperature. As time increases, the heat of the phase-change microspheres is almost released, so the air temperature in the last seven tanks is close to the ambient temperature.

It should be understood that the application of the present invention is not limited to the above examples, and those skilled in the art can make improvements or transformations according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (5)

1. a water-based phase change microsphere inner wall heat-preservation coating is characterized in that, described water-based phase change microsphere inner wall heat-preservation coating is by weight percentage, composed of the following components:

ACRYLIC EMULSION 20 ~ 40%, wetting agent 0.1 ~ 5%, dispersion agent 0.1 ~ 5%, diatomite 5 ~ 20%, wax phase change microballoon 5 ~ 10%, titanium dioxide 5 ~ 25%, thickening material 0.1 ~ 5%, kaolin 1 ~ 10%, Opacifying polymers 3 ~ 10%, other auxiliary agent 1 ~ 5%, surplus are water;

Described other auxiliary agent is one or more in mould inhibitor, sanitas, antiseptic-germicide or the frostproofer;

Described thickening material is alkali swelling property class and hydrophobically modified polyurethanes thickening material;

Described titanium dioxide is Rutile type Titanium Dioxide;

Described wax phase change microballoon is made up of paraffin and the polymer shell enclosed; Described paraffin is packaged in the polymer shell;

The mean diameter of described wax phase change microballoon is 6 ~ 45 microns;

Described wax phase change microballoon transformation temperature is 20-25 ℃, enthalpy of phase change＞100J/g.

2. water-based phase change microsphere inner wall heat-preservation coating according to claim 1 is characterized in that described Opacifying polymers is the hollow polymer spheroid;

The shell of described hollow polymer spheroid is the polymkeric substance that acrylate and vinylbenzene are formed.

3. water-based phase change microsphere inner wall heat-preservation coating according to claim 1 is characterized in that described wetting agent is the polyethenoxy ether class wetting agent.

4. water-based phase change microsphere inner wall heat-preservation coating according to claim 1 is characterized in that, described dispersion agent is high molecular weight polypropylene acid ammonium salt dispersion agent.

5. the preparation method of the described water-based phase of claim 1 a change microsphere inner wall heat-preservation coating is characterized in that, the preparation method of described water-based phase change microsphere inner wall heat-preservation coating may further comprise the steps:

Earlier take by weighing raw material according to formula rate, low-speed stage adds the water of part and whole wetting agent, dispersion agent, Rutile type Titanium Dioxide, diatomite and kaolin successively, and middling speed stirs; The hydrophobically modified polyurethane thickener that adds part treats that above raw material adding finishes high speed dispersion; Continuation adds ACRYLIC EMULSION, wax phase change microballoon, Opacifying polymers, alkali swelling class thickening material and remaining hydrophobically modified polyurethane thickener, remaining water and other auxiliary agent under middling speed stirs, middling speed stirs, more after filtration, and the packing of weighing.

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