CN108997873B - Super-hydrophobic self-cleaning heat-insulation building exterior wall coating - Google Patents

Abstract

The invention provides a super-hydrophobic self-cleaning heat-insulating building exterior wall coating, which relates to the technical field of coatings and comprises a putty layer from inside to outside, a heat-insulating coating and a self-cleaning coating, wherein the heat-insulating coating consists of a component A and a component B according to the weight ratio of 50:1-5, and the component A comprises the following components in parts by weight: the adhesive comprises a pure acrylic elastic emulsion, a flexible acrylic emulsion, a water-based epoxy resin emulsion, redispersible latex powder, wollastonite powder, modified nano ceramic hollow microspheres, polyacrylic acid hollow spheres, a water-retaining powder, 2-hydroxyethyl cellulose, an adhesion promoter and water, wherein the component B is a curing agent DX-50A; the self-cleaning coating consists of a component A and a component B according to the weight ratio of 100:1-5, wherein the component A comprises the following components in parts by weight: the composite material comprises organic silicon emulsion, fluorine-containing acrylic emulsion, modified nano silicon dioxide, polydimethylsiloxane, a dispersing agent NNO, ammonia water and water, wherein the component B is a silane coupling agent KH550, and the composite material has the effects of heat preservation, heat insulation and self cleaning.

Description

Super-hydrophobic self-cleaning heat-insulation building exterior wall coating

Technical Field

The invention relates to the technical field of coatings, in particular to a super-hydrophobic self-cleaning heat-insulation building outer wall coating.

Background

The exterior wall coating is a coating variety with the largest consumption in building coatings, and along with the continuous improvement of production and living standards of people, the requirements of people on the exterior wall coating are higher and higher, and the exterior wall coating not only has decorative performance, but also has various performances such as heat preservation, heat insulation, water resistance, corrosion resistance, self-cleaning and the like, so the exterior wall coating with multiple performances is produced at the same time.

The Chinese patent with the application number of 201510355482.7 discloses a heat-insulating coating, a preparation method thereof and a heat-insulating coating, wherein the heat-insulating coating comprises the following components in parts by weight: 15 to 30 parts of main material, 3 to 22 parts of acrylic polymer hollow spheres, 15 to 40 parts of water and 0.5 to 1.5 parts of thickening agent, wherein the main material is polymer resin with the elastic elongation of more than 800 percent and the glass transition temperature of less than minus 10 ℃, the acrylic polymer hollow sphere can be prepared by the thermal insulation coating to form a porous thermal insulation coating, so that steric hindrance is formed in the thermal insulation coating, the steric hindrance can block heat conduction and reduce heat loss, but the scheme has certain defects that the particle size of the acrylic polymer hollow spheres is 20-50 microns, the pores among the hollow spheres are large, and when sunlight is directly radiated, the heat brought by the high temperature outside is easy to be conducted into the room from the pores between the acrylic polymer hollow spheres, so that the heat preservation effect is reduced.

The application number is 200910048071.8, and the application is Chinese patent application of Shanghai Sanyinjin paint-making limited company and discloses a self-cleaning water-based fluorocarbon coating for building exterior walls, which is composed of the following raw materials in percentage by mass: 35-55% of fluorine emulsion, 18-35% of rutile titanium dioxide, 2-8% of nano titanium dioxide, 0.1-0.5% of defoaming agent, 0.1-0.3% of wetting agent, 2-8% of opaque polymer, 0.1-0.3% of flatting agent, 0.2-0.8% of dispersing agent and thickening agent: 0.1 to 0.3 percent of organic modified montmorillonite, 1.0 to 5.0 percent of polyurethane associated thickener, 1 to 3 percent of film forming additive, 1 to 2 percent of film forming agent, 1 to 3 percent of antifreeze and the balance of deionized water; the beneficial effects of the invention are: the excellent performance of the fluorine coating is maintained, the self-cleaning performance and the stain resistance of the fluorine coating are improved, and the outer surface of the building is kept as new as the outer surface of the building for a long time. The coating mainly utilizes the surface cleaning performance of fluorine atoms and the photocatalytic performance of nano materials, but the actual self-cleaning effect is not good.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a super-hydrophobic self-cleaning heat-insulating building outer wall coating.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

the super-hydrophobic self-cleaning heat-insulating building exterior wall coating comprises a putty layer, a heat-insulating coating and a self-cleaning coating from inside to outside, wherein the thickness of the putty layer is 5mm, the thickness of the heat-insulating coating is 1mm, and the thickness of the self-cleaning coating is 0.5 mm;

the heat-insulating coating is composed of a component A and a component B according to a weight ratio of 50:1-5, wherein the component A comprises the following components in parts by weight: 40-60 parts of pure acrylic elastic emulsion, 30-50 parts of flexible acrylic emulsion, 20-40 parts of water-based epoxy resin emulsion, 10-20 parts of redispersible latex powder, 10-20 parts of wollastonite powder, 20-40 parts of modified nano ceramic hollow microspheres, 20-40 parts of polyacrylic acid hollow spheres, 1-5 parts of water-suppressing powder, 1-5 parts of 2-hydroxyethyl cellulose, 1-5 parts of adhesion promoter and 150 parts of 100-doped water, wherein the component B is a curing agent DX-50A;

the self-cleaning coating is composed of a component A and a component B according to the weight ratio of 100:1-5, wherein the component A comprises the following components in parts by weight: 10-15 parts of organic silicon emulsion, 1-10 parts of fluorine-containing acrylic emulsion, 5-10 parts of modified nano silicon dioxide, 1-5 parts of polydimethylsiloxane, 1-5 parts of dispersant NNO, 1-3 parts of ammonia water and 30-50 parts of water, wherein the component B is a silane coupling agent KH 550.

Further, the preparation method of the modified nano ceramic hollow microsphere comprises the following steps: cleaning the nano ceramic hollow microspheres with clear water, drying at the temperature of 110-120 ℃, adding a silane coupling agent and ethanol into water, adjusting the pH of the system to 3 with acetic acid, heating to 40 ℃, adding the nano ceramic hollow microspheres, stirring for 1-2h, taking out, and drying at the temperature of 80-100 ℃ to obtain the modified nano ceramic hollow microspheres.

Further, the weight ratio of the silane coupling agent to the ethanol to the water is 3:9: 1.

Further, the silane coupling agent is a silane coupling agent KH550, a silane coupling agent KH570 or a mixture of the two.

Further, the particle size of the modified nano ceramic hollow microsphere is 20-50 nm.

Furthermore, the particle size of the polyacrylic acid hollow sphere is 0.5-5 μm.

Furthermore, the adhesion promoter is at least one of beta- (3,4 epoxy cyclohexyl) ethyl trimethyl silane, gamma-mercaptopropyl trimethoxy silane, siloxy copolymer resin, aminosiloxane and gamma- (methacryloxy) propyl trimethoxy silane.

Further, the preparation method of the modified nano silicon dioxide comprises the following steps: adding nano silicon dioxide and ethanol into water, stirring uniformly, adding stearic acid dissolved by the ethanol dropwise by using a separating funnel, continuously stirring for 2 hours, carrying out suction filtration, and drying at 130 ℃ to obtain the modified nano silicon dioxide.

Further, the preparation method of the heat-insulating coating comprises the following steps:

(1) mixing the pure acrylic elastic emulsion and the flexible acrylic emulsion water-based epoxy resin emulsion, and adding redispersible latex powder, wollastonite powder, town water powder, 2-hydroxyethyl cellulose and adhesion promoter under the high-speed stirring of 3000r/min to obtain a mixed material A;

(2) adding the polyacrylic acid hollow spheres into water, adding the modified nano ceramic hollow microspheres in batches under the high-speed stirring of 2000r/min, and continuously stirring at a high speed for 30-50min to obtain a mixed material B;

(3) and adding the mixed material B into the mixed material A, and stirring at 2000r/min for 10min to obtain the heat-insulating coating.

Further, the preparation method of the self-cleaning coating comprises the following steps:

(1) adding a dispersing agent NNO and ammonia water into water, ultrasonically dispersing for 30min under the high-speed stirring of 2000r/min, adding modified nano silicon dioxide and polydimethylsiloxane, heating to 50 ℃, and stirring for 1 h;

(2) adding the organic silicon emulsion and the fluorine-containing acrylic emulsion, and continuously stirring for 1h to obtain the self-cleaning coating.

(III) advantageous effects

The invention provides a super-hydrophobic self-cleaning heat-insulating building exterior wall coating, which has the following beneficial effects:

the surface of the modified nano ceramic hollow microspheres in the thermal insulation coating is modified with hydroxyl, the modified nano ceramic hollow microspheres and the polyacrylic acid hollow spheres are mutually attracted through hydrogen bonds in emulsion, and finally can be coated on the outer surfaces of the polyacrylic acid hollow spheres in a spherical shell shape due to the existence of steric hindrance, so that gaps among the polyacrylic acid hollow spheres are filled, a multi-layer porous thermal insulation system is constructed, heat is prevented from being conducted from the outdoor to the indoor, and the thermal insulation coating has an excellent thermal insulation effect; the self-cleaning coating is characterized in that nano silicon dioxide in the self-cleaning coating is modified by stearic acid, a-COOH group on the stearic acid reacts with a-OH group on the surface of the nano silicon dioxide, and the-COOH group and the-OH group are dispersed in an emulsion to form a continuous inorganic hydrophobic film, polydimethylsiloxane has good chemical stability, optical property and high hydrophobicity, and the addition of the polydimethylsiloxane can reinforce the inorganic hydrophobic film.

Drawings

FIG. 1 is a schematic view of the microstructure of modified nano-ceramic hollow microspheres and polyacrylic acid hollow spheres;

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The super-hydrophobic self-cleaning heat-insulating building exterior wall coating comprises a putty layer, a heat-insulating coating and a self-cleaning coating from inside to outside, wherein the thickness of the putty layer is 5mm, the thickness of the heat-insulating coating is 1mm, and the thickness of the self-cleaning coating is 0.5 mm;

putty, Tianwei building material factory in Xianshan county, super libang environmental protection and smell purification.

The heat-insulating coating comprises a component A and a component B according to the weight ratio of 50:1-5, wherein the component A comprises the following components in parts by weight: 40-60 parts of pure acrylic elastic emulsion, 30-50 parts of flexible acrylic emulsion, 20-40 parts of water-based epoxy resin emulsion, 10-20 parts of redispersible latex powder, 10-20 parts of wollastonite powder, 20-40 parts of modified nano ceramic hollow microspheres, 20-40 parts of polyacrylic acid hollow spheres, 1-5 parts of water-suppressing powder, 1-5 parts of 2-hydroxyethyl cellulose, 1-5 parts of adhesion promoter and 150 parts of 100-doped water, wherein the component B is curing agent DX-50A;

specifically, the pure acrylic elastic emulsion can be produced by Liaohua chemical industry Co., Ltd, Guangzhou city, with the trade mark LH3328 and the viscosity 4000 (S); the flexible acrylic emulsion may be Baolijia, brand number BLJ-963M; the aqueous epoxy resin emulsion can be green-vegetable aqueous epoxy resin emulsion GEM 02; the redispersible latex powder can be 8010 or 8020 of Anhui vitamin redispersible latex powder; the wollastonite powder may be active wollastonite powder produced by Lingxin mining of Lingshou county; the polyacrylic acid hollow sphere is prepared by a micelle method; the water-suppressing powder is Danshuai brand DS; 2-hydroxyethyl cellulose CAS number 9004-62-0, available from Shenyang New Ship chemical Co., Ltd; curing agent DX-50A is prepared from Asahi DX-50 prepared by Asahi Kasei Pharma Kogyo Co., Ltd.

The self-cleaning coating is composed of a component A and a component B according to the weight ratio of 100:1-5, wherein the component A comprises the following components in parts by weight: 10-15 parts of organic silicon emulsion, 1-10 parts of fluorine-containing acrylic emulsion, 5-10 parts of modified nano silicon dioxide, 1-5 parts of polydimethylsiloxane, 1-5 parts of dispersant NNO, 1-3 parts of ammonia water and 30-50 parts of water, wherein the component B is a silane coupling agent KH 550.

Specifically, the organosilicon emulsion is a Koshili organosilicon emulsion, and the viscosity is 2500-; fluorine-containing acrylic emulsion EG616G, Taicang Zhonghua environmental protection chemical Co., Ltd; nanosilicon dioxide, mc363, mingfang mingxi new materials ltd; polydimethylsiloxane, TNMF-XX, guangdong ultra new materials ltd; dispersant NNO, CAS number: 36290-04-7, Anyang Shuanghua bicyclic auxiliary agent, LLC; ammonia, nan tong runfeng petrochemical limited, technical grade 28%; KH550, a silane coupling agent, JUNNANCHENTIANGCHEMICAL CO., LTD 550.

The preparation method of the modified nano ceramic hollow microsphere comprises the following steps: cleaning the nano ceramic hollow microspheres with clear water, drying at the temperature of 110-120 ℃, adding a silane coupling agent and ethanol into water, adjusting the pH of the system to 3 with acetic acid, heating to 40 ℃, adding the nano ceramic hollow microspheres, stirring for 1-2h, taking out, and drying at the temperature of 80-100 ℃ to obtain the modified nano ceramic hollow microspheres.

Wherein the weight ratio of the silane coupling agent to the ethanol to the water is 3:9: 1.

Wherein the silane coupling agent is silane coupling agent KH550, silane coupling agent KH570 or a mixture of the two.

Wherein the particle size of the modified nano ceramic hollow microsphere is 20-50 nm.

Wherein the particle size of the polyacrylic acid hollow sphere is 0.5-5 μm.

Wherein the adhesion promoter is at least one of beta- (3,4 epoxy cyclohexyl) ethyl trimethyl silane, gamma-mercaptopropyl trimethoxy silane, siloxy copolymer resin, aminosiloxane and gamma- (methacryloxy) propyl trimethoxy silane.

The preparation method of the modified nano silicon dioxide comprises the following steps: adding nano silicon dioxide and ethanol into water, stirring uniformly, adding stearic acid dissolved by the ethanol dropwise by using a separating funnel, continuously stirring for 2 hours, carrying out suction filtration, and drying at 130 ℃ to obtain the modified nano silicon dioxide.

The preparation method of the heat-insulating coating comprises the following steps:

(1) mixing the pure acrylic elastic emulsion and the flexible acrylic emulsion water-based epoxy resin emulsion, and adding redispersible latex powder, wollastonite powder, town water powder, 2-hydroxyethyl cellulose and adhesion promoter under the high-speed stirring of 3000r/min to obtain a mixed material A;

(2) adding the polyacrylic acid hollow spheres into water, adding the modified nano ceramic hollow microspheres in batches under the high-speed stirring of 2000r/min, and continuously stirring at a high speed for 30-50min to obtain a mixed material B;

(3) and adding the mixed material B into the mixed material A, and stirring at 2000r/min for 10min to obtain the heat-insulating coating.

The preparation method of the self-cleaning coating comprises the following steps:

(1) adding a dispersing agent NNO and ammonia water into water, ultrasonically dispersing for 30min under the high-speed stirring of 2000r/min, adding modified nano silicon dioxide and polydimethylsiloxane, heating to 50 ℃, and stirring for 1 h;

(2) adding the organic silicon emulsion and the fluorine-containing acrylic emulsion, and continuously stirring for 1h to obtain the self-cleaning coating.

Example 1:

the super-hydrophobic self-cleaning heat-insulating building exterior wall coating comprises a putty layer, a heat-insulating coating and a self-cleaning coating from inside to outside, wherein the thickness of the putty layer is 5mm, the thickness of the heat-insulating coating is 1mm, and the thickness of the self-cleaning coating is 0.5 mm;

the heat-insulating coating comprises a component A and a component B according to the weight ratio of 50:3, wherein the component A comprises the following components in parts by weight: 50 parts of pure acrylic elastic emulsion, 40 parts of flexible acrylic emulsion, 30 parts of water-based epoxy resin emulsion, 15 parts of redispersible latex powder, 15 parts of wollastonite powder, 25 parts of modified nano ceramic hollow microspheres (the particle size is 20-50nm), 25 parts of polyacrylic acid hollow spheres (the particle size is 0.5-5 mu m), 4 parts of water-suppressing powder, 3 parts of 2-hydroxyethyl cellulose, 2 parts of beta- (3,4 epoxy cyclohexyl) ethyl trimethyl silane and 120 parts of water, wherein the component B is a curing agent DX-50A;

the self-cleaning coating is composed of a component A and a component B according to the weight ratio of 100:3, wherein the component A comprises the following components in parts by weight: 12 parts of organic silicon emulsion, 5 parts of fluorine-containing acrylic emulsion, 6 parts of modified nano silicon dioxide, 3 parts of polydimethylsiloxane, 3 parts of dispersant NNO, 2 parts of ammonia water and 40 parts of water, wherein the component B is a silane coupling agent KH 550.

The preparation method of the modified nano ceramic hollow microsphere comprises the following steps: cleaning the nano ceramic hollow microspheres with clear water, drying at 105 ℃, adding a silane coupling agent KH550 and ethanol into water (the weight ratio of the coupling agent KH550 to the ethanol to the water is 3:9:1), adjusting the pH of the system to 3 with acetic acid, heating to 40 ℃, adding the nano ceramic hollow microspheres, stirring for 1-2h, taking out, and drying at 90 ℃ to obtain the modified nano ceramic hollow microspheres.

The preparation method of the modified nano silicon dioxide comprises the following steps: adding nano silicon dioxide and ethanol into water, stirring uniformly, adding stearic acid dissolved by the ethanol dropwise by using a separating funnel, continuously stirring for 2 hours, carrying out suction filtration, and drying at 130 ℃ to obtain the modified nano silicon dioxide.

The preparation method of the heat-insulating coating comprises the following steps:

(1) mixing the pure acrylic elastic emulsion and the flexible acrylic emulsion water-based epoxy resin emulsion, and adding redispersible latex powder, wollastonite powder, town water powder, 2-hydroxyethyl cellulose and adhesion promoter under the high-speed stirring of 3000r/min to obtain a mixed material A;

(2) adding the polyacrylic acid hollow spheres into water, adding the modified nano ceramic hollow microspheres in batches under the high-speed stirring of 2000r/min, and continuously stirring at a high speed for 30-50min to obtain a mixed material B;

(3) and adding the mixed material B into the mixed material A, and stirring at 2000r/min for 10min to obtain the heat-insulating coating.

The preparation method of the self-cleaning coating comprises the following steps:

(1) adding a dispersing agent NNO and ammonia water into water, ultrasonically dispersing for 30min under the high-speed stirring of 2000r/min, adding modified nano silicon dioxide and polydimethylsiloxane, heating to 50 ℃, and stirring for 1 h;

(2) adding the organic silicon emulsion and the fluorine-containing acrylic emulsion, and continuously stirring for 1h to obtain the self-cleaning coating.

Example 2:

the super-hydrophobic self-cleaning heat-insulating building exterior wall coating comprises a putty layer, a heat-insulating coating and a self-cleaning coating from inside to outside, wherein the thickness of the putty layer is 5mm, the thickness of the heat-insulating coating is 1mm, and the thickness of the self-cleaning coating is 0.5 mm;

the heat-insulating coating comprises a component A and a component B according to the weight ratio of 50:1, wherein the component A comprises the following components in parts by weight: 40 parts of pure acrylic elastic emulsion, 30 parts of flexible acrylic emulsion, 20 parts of water-based epoxy resin emulsion, 10 parts of redispersible latex powder, 10 parts of wollastonite powder, 20 parts of modified nano ceramic hollow microspheres (the particle size is 20-50nm), 20 parts of polyacrylic acid hollow spheres (the particle size is 0.5-5 mu m), 1 part of water-proof powder, 1 part of 2-hydroxyethyl cellulose, 1 part of gamma-mercaptopropyl trimethoxy silane and 100 parts of water, wherein the component B is curing agent DX-50A;

the self-cleaning coating is composed of a component A and a component B according to the weight ratio of 100:1, wherein the component A comprises the following components in parts by weight: 10 parts of organic silicon emulsion, 1 part of fluorine-containing acrylic emulsion, 5 parts of modified nano silicon dioxide, 1 part of polydimethylsiloxane, 1 parts of dispersant NNO, 1 part of ammonia water and 30 parts of water, wherein the component B is a silane coupling agent KH 550.

The preparation method of the modified nano ceramic hollow microsphere comprises the following steps: cleaning the nano ceramic hollow microspheres with clear water, drying at 110 ℃, adding a silane coupling agent KH570 and ethanol into water (the weight ratio of the silane coupling agent KH570 to the ethanol to the water is 3:9:1), adjusting the pH of the system to 3 with acetic acid, heating to 40 ℃, adding the nano ceramic hollow microspheres, stirring for 1-2h, taking out, and drying at 80 ℃ to obtain the modified nano ceramic hollow microspheres.

The preparation method of the modified nano-silica is completely the same as that of the embodiment 1.

The preparation method of the heat-insulating coating is completely the same as that of the embodiment 1.

The preparation method of the self-cleaning coating is completely the same as that of the embodiment 1.

Example 3:

the super-hydrophobic self-cleaning heat-insulating building exterior wall coating comprises a putty layer, a heat-insulating coating and a self-cleaning coating from inside to outside, wherein the thickness of the putty layer is 5mm, the thickness of the heat-insulating coating is 1mm, and the thickness of the self-cleaning coating is 0.5 mm;

the heat-insulating coating is composed of a component A and a component B according to the weight ratio of 10:1, wherein the component A comprises the following components in parts by weight: 60 parts of pure acrylic elastic emulsion, 50 parts of flexible acrylic emulsion, 40 parts of water-based epoxy resin emulsion, 20 parts of redispersible latex powder, 20 parts of wollastonite powder, 40 parts of modified nano ceramic hollow microspheres (the particle size is 20-50nm), 40 parts of polyacrylic acid hollow spheres (the particle size is 0.5-5 mu m), 5 parts of water-proof powder, 5 parts of 2-hydroxyethyl cellulose, 5 parts of siloxy copolymer resin and 150 parts of water, wherein the component B is curing agent DX-50A;

the self-cleaning coating is composed of a component A and a component B according to the weight ratio of 20:1, wherein the component A comprises the following components in parts by weight: 15 parts of organic silicon emulsion, 10 parts of fluorine-containing acrylic emulsion, 10 parts of modified nano silicon dioxide, 5 parts of polydimethylsiloxane, 5 parts of dispersant NNO, 3 parts of ammonia water and 50 parts of water, wherein the component B is a silane coupling agent KH 550.

The preparation method of the modified nano ceramic hollow microsphere comprises the following steps: cleaning the nano ceramic hollow microspheres with clear water, drying at 120 ℃, adding a silane coupling agent KH550 and ethanol into water (the weight ratio of the coupling agent KH550 to the ethanol to the water is 3:9:1), adjusting the pH of the system to 3 with acetic acid, heating to 40 ℃, adding the nano ceramic hollow microspheres, stirring for 1-2h, taking out, and drying at 100 ℃ to obtain the modified nano ceramic hollow microspheres.

The preparation method of the modified nano-silica is completely the same as that of the embodiment 1.

The preparation method of the heat-insulating coating is completely the same as that of the embodiment 1.

The preparation method of the self-cleaning coating is completely the same as that of the embodiment 1.

Experimental example 1:

basically the same as the embodiment, except that the modified nano ceramic hollow micro-beads are not added in the component A of the heat-insulating coating.

Experimental example 2:

basically the same as the example, except that no polyacrylic acid hollow sphere is added in the component A of the thermal insulation coating.

The heat-insulating coating in the embodiment 1-3 is coated on the surface of a building, the coating thickness is 1.5mm, the heat-insulating coating is formed after drying, the heat conductivity of the heat-insulating coating in the embodiment 1-3 is tested by adopting an EN12664 measuring method, wherein the heat conductivity directly reflects the heat-insulating effect of the heat-insulating coating, the heat conductivity of the heat-insulating coating formed by the heat-insulating coating in the embodiment 1-3 is shown in Table 1, and the comparative example 1 is the heat-insulating coating prepared by the embodiment 1 in the Chinese patent with the application number of 201510355482.7.

Table 1:

in conclusion, the thermal conductivity of the thermal insulation coating in the examples 1 to 3 of the invention is between 0.031 and 0.036, while the thermal conductivity of the comparative example 1 is 0.085, which is higher than that of the thermal insulation coating in the examples 1 to 3 of the invention, so that the thermal insulation effect of the thermal insulation coating is better than that of the comparative document.

The heat-insulating coating in the embodiment 1, the experiment 1 and the experiment 2 is coated on the surface of a building, the coating thickness is 1.5mm, after drying, the heat-insulating coating is formed, the heat conductivity of the heat-insulating coating in the embodiment 1, the experiment 1 and the experiment 2 is tested by adopting an EN12664 measuring method, wherein the heat conductivity directly reflects the heat-insulating effect of the heat-insulating coating, and the result is shown in Table 2:

table 2:

the thermal insulation coating of the embodiment 1 of the invention has both the modified nano ceramic hollow microspheres and the polyacrylic acid hollow spheres, only the polyacrylic acid hollow spheres are used in the experimental example 1, only the modified nano ceramic hollow microspheres are used in the experimental example 2, and it can be seen from table 2 that the thermal conductivity of the thermal insulation coating having both the modified nano ceramic hollow microspheres and the polyacrylic acid hollow spheres is lower than that of the thermal insulation coating containing only the single modified nano ceramic hollow microspheres or polyacrylic acid hollow spheres.

Testing the heat preservation performance:

two identical transparent hollow glass bricks (10cm multiplied by 10cm), wherein one end of each transparent hollow glass brick is provided with an opening, the outer surface of one hollow glass brick is coated with the heat insulation coating of the invention embodiment 1, the coating thickness is 1.5mm (test example 1), the outer surface of the other hollow glass brick is coated with the purchased heat insulation coating, the type is that the log house heat insulation paint sun-proof coating is coated, the coating thickness is also 1.5mm (test example 2), the hollow glass bricks of the test examples 1 and 2 are respectively placed under an infrared heating lamp with the distance of 40cm downwards, thermometers are respectively placed in the hollow glass bricks of the test examples 1 and 2, the initial temperature is 22 ℃, after the infrared heating lamp irradiates for 4 hours, the thermometers are taken out to check the thermometer readings, the thermometer readings of the test example 1 is 25.5 ℃, the thermometer readings of the test example 2 is 31 ℃, the heat insulation performance test results show that the heat insulation coating has good actual heat insulation effect and is far superior to the commercial heat insulation coating.

Super hydrophobicity test:

the self-cleaning coating in examples 1-3 of the present invention was coated on a glass sheet, the glass sheet was immersed in deionized water and the rolling angle and contact angle of the coating were measured as a function of time, and the following table 3 shows the test results.

Table 3:

as can be seen from the above table, along with the extension of the soaking time, when the coating is soaked for 40 hours, the contact angle is more than 140 degrees, the rolling angle is less than 30 degrees, the coating still has super-hydrophobic property, the water-resistant stability is good, when rainwater contacts the coating, the coating is not permeable, so the coating can roll, and dust on the surface of the coating is adhered and taken away during rolling, thereby achieving the self-cleaning function.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (4)

1. The super-hydrophobic self-cleaning heat-preservation and heat-insulation building outer wall coating is characterized by comprising a putty layer, a heat-preservation coating and a self-cleaning coating from inside to outside, wherein the thickness of the putty layer is 5mm, the thickness of the heat-preservation coating is 1mm, and the thickness of the self-cleaning coating is 0.5 mm;

the heat-insulating coating is composed of a component A and a component B according to a weight ratio of 50:1-5, wherein the component A comprises the following components in parts by weight: 40-60 parts of pure acrylic elastic emulsion, 30-50 parts of flexible acrylic emulsion, 20-40 parts of water-based epoxy resin emulsion, 10-20 parts of redispersible latex powder, 10-20 parts of wollastonite powder, 20-40 parts of modified nano ceramic hollow microspheres, 20-40 parts of polyacrylic acid hollow spheres, 1-5 parts of water-suppressing powder, 1-5 parts of 2-hydroxyethyl cellulose, 1-5 parts of adhesion promoter and 150 parts of 100-doped water, wherein the component B is a curing agent DX-50A;

the preparation method of the modified nano ceramic hollow microsphere comprises the following steps: cleaning nano ceramic hollow microspheres with clear water, drying at the temperature of 110-120 ℃, adding a silane coupling agent and ethanol into water, adjusting the pH of the system to 3 with acetic acid, heating to 40 ℃, adding the nano ceramic hollow microspheres, stirring for 1-2 hours, taking out, and drying at the temperature of 80-100 ℃ to obtain the modified nano ceramic hollow microspheres;

the self-cleaning coating is composed of a component A and a component B according to the weight ratio of 100:1-5, wherein the component A comprises the following components in parts by weight: 10-15 parts of organic silicon emulsion, 1-10 parts of fluorine-containing acrylic emulsion, 5-10 parts of modified nano silicon dioxide, 1-5 parts of polydimethylsiloxane, 1-5 parts of dispersant NNO, 1-3 parts of ammonia water and 30-50 parts of water, wherein the component B is a silane coupling agent KH 550;

the preparation method of the modified nano silicon dioxide comprises the following steps: adding nano silicon dioxide and ethanol into water, stirring uniformly, adding stearic acid dissolved by the ethanol dropwise by using a separating funnel, continuously stirring for 2 hours, performing suction filtration, and drying at 130 ℃ to obtain the modified nano silicon dioxide;

the particle size of the modified nano ceramic hollow microspheres is 20-50 nm;

the particle size of the polyacrylic acid hollow sphere is 0.5-5 μm.

2. The superhydrophobic self-cleaning heat preservation and insulation building outer wall coating material of claim 1, wherein the weight ratio of the silane coupling agent, the ethanol and the water is 3:9: 1.

3. The super-hydrophobic self-cleaning heat-insulating building exterior wall coating as claimed in claim 1, wherein the silane coupling agent is a silane coupling agent KH550, a silane coupling agent KH570 or a mixture of the two.

4. The paint of claim 1, wherein the adhesion promoter is at least one of beta- (3,4 epoxycyclohexyl) ethyltrimethylsilane, gamma-mercaptopropyltrimethoxysilane, siloxy copolymer resin, aminosiloxane and gamma- (methacryloyloxy) propyltrimethoxysilane.

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