Infrared-reflective heat-insulating paint and method for producing the same

Abstract

The application discloses infrared-reflecting heat-insulating paint, which is prepared from the following raw materials: component A and a curing agent; the raw materials of component A include 50 parts of film-forming resin, 20-30 parts of fillers, 2-3 parts of a dispersing agent and 20-30 parts of water; wherein the fillers include modified hollow glass microbeads and modified sepiolite. The application further discloses a preparation method of the infrared-reflecting heat-insulating paint, which comprises the following steps: mixing the raw materials of component A, and then mixing the component A with the curing agent to obtain the infrared-reflecting heat-insulating paint. The infrared-reflecting heat-insulating paint has good infrared reflection, heat insulation and stain resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint technology, in particular to a heat insulation paint capable of infrared reflection and a preparation method thereof. BACKGROUND

[0002] With the continuous development of modern cities, the urban heat island effect has become a problem we must face, in order to effectively control the urban heat island effect and reduce the energy consumption problem generated in the building, in recent years, more and more attention of scientific researchers. One of the effective ways to solve this problem is to apply near-infrared reflective material to the city's buildings and infrastructure, which reflects part of the visible light and near-infrared light in the sunlight, reduces the surface temperature of the building and achieves the effect of heat insulation. However, due to the presence of a large amount of dust in the air, the coating on the surface of the building is easy to attach a large amount of dust, which reduces the infrared reflection effect, and further reduces the infrared reflection and heat insulation performance of the paint. SUMMARY

[0003] Based on the technical problems existing in the background technology, the present application provides a heat insulation paint capable of infrared reflection and a preparation method thereof, which has good infrared reflection, heat insulation and anti-fouling performance.

[0004] The present application provides a heat insulation paint capable of infrared reflection, which comprises: A component and a curing agent; the raw materials of A component include: 50 parts of film-forming resin, 20-30 parts of filler, 2-3 parts of dispersing agent and 20-30 parts of water; wherein the filler comprises modified hollow glass microbeads and modified sepiolite.

[0005] Preferably, in the preparation process of the modified hollow glass microbeads, a polydopamine layer is coated on the surface of the hollow glass microbeads, then mixed with the amino-grafted porous nanometer titanium dioxide aqueous solution, stirred and reacted, and then solid-liquid separation is performed to obtain intermediate particles; the intermediate particles are reacted with POSS containing epoxy groups to obtain the modified hollow glass microbeads.

[0006] In the present application, a polydopamine layer is first coated on the surface of the hollow glass microbeads, the ortho-phenol hydroxyl groups on the surface of the polydopamine layer react with the amino-grafted porous nanometer titanium dioxide, so that the nanometer titanium dioxide is coated on the surface of the hollow glass microbeads, and the problem of uneven dispersion of the hollow glass microbeads and the nanometer titanium dioxide is improved; and the structure of the hollow glass microbeads and the porous nanometer titanium dioxide layer cooperates with each other, so that a large amount of infrared and visible light is reflected, and a small amount of heat generated by infrared and visible light can be insulated by the hollow glass microbeads, thereby greatly improving the heat insulation performance of the paint; and the excess amino groups on the surface of the intermediate particles are further reacted with the POSS containing epoxy groups, which can improve the hydrophobicity of the hollow glass microbeads, make them uniformly dispersed in the film-forming resin, and improve the dispersibility of the filler and the film-forming resin and the mechanical properties of the paint.

[0007] Preferably, the reaction is stirred at room temperature for 8-10 hours during the preparation of the modified hollow glass microsphere.

[0008] Preferably, the particle size of the hollow glass microsphere is 50-200 μm during the preparation of the modified hollow glass microsphere.

[0009] Preferably, the particle size of the porous nanometer titanium dioxide is ≤100 nm, the porosity is 5-8%, and the pore size is ≤10 nm during the preparation of the modified hollow glass microsphere.

[0010] The present application controls the particle size of the hollow glass microsphere and the porous nanometer titanium dioxide, and the pore size of the porous nanometer titanium dioxide, and introduces POSS, so that the modified hollow glass microsphere has a micro-nano structure, improves the anti-fouling performance of the paint, and improves the stability of the infrared reflection performance.

[0011] Preferably, the mass fraction of the aqueous solution of the amino-grafted porous nanometer titanium dioxide is 5-7 wt% during the preparation of the modified hollow glass microsphere.

[0012] Preferably, the pH of the aqueous solution of the amino-grafted porous nanometer titanium dioxide is 4-5 during the preparation of the modified hollow glass microsphere.

[0013] Preferably, the amino-grafted porous nanometer titanium dioxide is a silane coupling agent containing amino group grafted and modified porous nanometer titanium dioxide during the preparation of the modified hollow glass microsphere.

[0014] Preferably, the POSS containing an epoxy group is an eight epoxy cyclohexyl ethyl cage polysilsesquioxane during the preparation of the modified hollow glass microsphere.

[0015] Preferably, the temperature for the reaction of the intermediate particles with the POSS containing an epoxy group is 60-70°C, and the time is 8-10 hours during the preparation of the modified hollow glass microsphere.

[0016] Preferably, the weight ratio of the intermediate particles to the POSS containing an epoxy group is 1:1-1.5 during the preparation of the modified hollow glass microsphere.

[0017] Preferably, the reaction solvent of the intermediate particles and the POSS containing an epoxy group is ethanol during the preparation of the modified hollow glass microsphere.

[0018] Preferably, the modified sepiolite is a silane coupling agent containing amino group grafted and modified sepiolite.

[0019] The silane coupling agent containing an amino group can be 3-aminopropyl triethoxysilane, 3-aminopropyl trimethoxysilane, etc.

[0020] The modified sepiolite can improve the suspension stability of the modified hollow glass microbeads in the paint, and the amino groups in the modified sepiolite can also react with the active groups in the film-forming resin, further improving the mechanical properties of the paint.

[0021] The dispersant can be dispersant BYK-190, dispersant Coadis123K, etc. The use of the dispersant can further improve the dispersion uniformity and suspension stability of the filler in cooperation with the modified sepiolite.

[0022] Preferably, the weight ratio of the modified hollow glass microbeads and the modified sepiolite is 2-4:1.

[0023] Preferably, the film-forming resin is one of an acrylic resin, an epoxy resin, and an isocyanate resin.

[0024] Preferably, the film-forming resin is composed of water-based acrylic resin and fluorine-containing acrylic resin in a weight ratio of 3-4:1.

[0025] Preferably, the weight ratio of the A component to the curing agent is 9-10:1.

[0026] The curing agent can be peroxide, photoinitiator, etc.

[0027] The A component can further include defoaming agent, leveling agent, enzyme inhibitor, etc.

[0028] The application also provides a preparation method of the infrared-reflecting thermal insulation paint, comprising the following steps: mixing the raw materials of the A component, and then mixing the curing agent to obtain the infrared-reflecting thermal insulation paint.

[0029] The A component and the curing agent are stored separately, and can be mixed before use of the paint.

[0030] Advantages:

[0031] 1. The application first coats a polydopamine layer on the surface of the hollow glass microbeads, and the ortho-phenol hydroxyl groups on the surface of the polydopamine layer react with the amino-grafted porous nanometer titanium dioxide, so that the nanometer titanium dioxide is coated on the surface of the hollow glass microbeads, improving the problem that the hollow glass microbeads and the nanometer titanium dioxide are not easy to disperse uniformly. The structure of the hollow glass microbeads and the porous nanometer titanium dioxide layer cooperates with each other, so that a large amount of infrared rays and visible light are reflected, and the heat generated by a small amount of infrared rays and visible light can be insulated by the hollow glass microbeads, thereby greatly improving the thermal insulation performance of the paint. The excess amino groups on the surface of the intermediate particles further react with the POSS containing epoxy groups, which can improve the hydrophobicity of the hollow glass microbeads, make them disperse uniformly in the film-forming resin, and improve the dispersion of the filler and the film-forming resin and the mechanical properties of the paint.

[0032] 2. The present application controls the particle size of hollow glass microspheres, porous nanometer titanium dioxide, and the pore size of porous nanometer titanium dioxide, and introduces POSS, so that the modified hollow glass microspheres have a micro-nano structure, improve the anti-staining performance of the paint, and improve the stability of the infrared reflection performance.

[0033] 3. The modified sepiolite can improve the suspension stability of the modified hollow glass microspheres in the paint, and the amino groups in the modified sepiolite can also react with active groups in the film-forming resin, further improving the mechanical properties of the paint. DETAILED DESCRIPTION

[0034] In the following, the technical solutions of the present application will be described in detail through specific examples, but it should be clear that these examples are used for illustration, but not to be interpreted as limiting the scope of the present application.

[0035] Example 1

[0036] An infrared-reflecting thermal insulation paint, the raw materials of which include: A component and a curing agent; the raw materials of the A component include, by weight: 37.5 parts of water-based acrylic resin, 12.5 parts of fluorine-containing acrylic resin film-forming resin, 20 parts of filler, 2 parts of dispersant BYK-1902, and 30 parts of deionized water; wherein the filler includes modified hollow glass microspheres and 3-aminopropyl triethoxysilane modified sepiolite;

[0037] The weight ratio of the modified hollow glass microspheres and the 3-aminopropyl triethoxysilane modified sepiolite is 4:1; the weight ratio of the A component to the curing agent is 9:1;

[0038] In the preparation process of the modified hollow glass microspheres, 200μm hollow glass microspheres were taken, 3mg / ml dopamine solution (its solvent is Tris-HCl buffer solution with pH=8) was added, and the reaction was stirred at room temperature for 12h, filtered, washed with water, and dried to obtain hollow glass microspheres coated with a polydopamine layer;

[0039] The 3-aminopropyl triethoxysilane modified porous nanometer titanium dioxide (the particle size of the porous nanometer titanium dioxide is ≤100nm, the porosity is 8%, and the pore size is ≤10nm) was uniformly dispersed in deionized water to make the mass fraction 5wt%, and the pH was adjusted to 5, then the hollow glass microspheres coated with a polydopamine layer were added, and the reaction was stirred at room temperature for 8h, filtered, washed with water, and dried to obtain intermediate particles;

[0040] The intermediate particles in 1 were mixed with an ethanol solution containing 1g of octa-epoxy cyclohexyl ethyl cage polysilsesquioxane, and the reaction was stirred at 70℃ for 8h, filtered, washed, and dried to obtain modified hollow glass microspheres.

[0041] The preparation method of the infrared-reflective thermal insulation paint comprises the following steps: mixing the raw materials of the A component, and then mixing the curing agent to obtain the infrared-reflective thermal insulation paint.

[0042] The A component is obtained by adding the dispersant into deionized water, uniformly mixing, then adding the filler, uniformly stirring and dispersing, and then adding the fluorine-containing acrylic acid and the water-based acrylic acid and uniformly stirring; and the infrared-reflective thermal insulation paint is obtained by mixing the A component and the curing agent.

[0043] The A component and the curing agent are independently stored, and the A component and the curing agent are mixed before the paint is used.

[0044] Example 2

[0045] The infrared-reflective thermal insulation paint comprises an A component and a curing agent, and the raw materials of the A component comprise, by weight, 40 parts of water-based acrylic resin, 10 parts of fluorine-containing acrylic resin film-forming resin, 30 parts of filler, 3 parts of dispersant BYK-1903, and 20 parts of deionized water; wherein the filler comprises modified hollow glass microbeads and 3-aminopropyl triethoxysilane modified sepiolite.

[0046] The weight ratio of the modified hollow glass microbeads and the 3-aminopropyl triethoxysilane modified sepiolite is 2:1, and the weight ratio of the A component and the curing agent is 10:1.

[0047] In the preparation process of the modified hollow glass microbeads, 50μm hollow glass microbeads are taken, 3mg / ml dopamine solution (the solvent is Tris-HCl buffer solution with pH=8) is added, stirring reaction is carried out at room temperature for 12h, filtration, water washing, and drying are carried out to obtain hollow glass microbeads coated with a polydopamine layer.

[0048] The 3-aminopropyl triethoxysilane modified porous nanometer titanium dioxide (the particle size of the porous nanometer titanium dioxide is ≤100nm, the porosity is 5%, and the pore size is ≤10nm) is uniformly dispersed in deionized water to make the mass fraction 7wt%, and the pH is adjusted to 4, then the hollow glass microbeads coated with a polydopamine layer are added, stirring reaction is carried out at room temperature for 10h, filtration, water washing, and drying are carried out to obtain intermediate particles.

[0049] The intermediate particles in 1 are mixed with an ethanol solution containing 1.5g of octa-epoxy cyclohexyl ethyl cage polysilsesquioxane, the temperature is raised to 60℃, stirring reaction is carried out for 10h, filtration, washing, and drying are carried out to obtain the modified hollow glass microbeads.

[0050] The preparation method of the infrared-reflective thermal insulation paint comprises the following steps: mixing the raw materials of the A component, and then mixing the curing agent to obtain the infrared-reflective thermal insulation paint.

[0051] The dispersant is added into the deionized water and mixed, then the filler is added and stirred to disperse uniformly, then the fluorine-containing acrylic acid and the water-based acrylic acid are added and stirred to mix uniformly to obtain the A component; the A component is mixed with the curing agent to obtain the infrared-reflecting heat insulation paint.

[0052] The A component and the curing agent are independently stored respectively, and the A component can be mixed with the curing agent before the paint is used.

[0053] Example 3

[0054] An infrared-reflecting heat insulation paint, raw materials of which include: an A component and a curing agent; raw materials of the A component include, by weight: 40 parts of water-based acrylic resin, 10 parts of fluorine-containing acrylic resin film-forming resin, 25 parts of filler, 2.5 parts of dispersant BYK-1902, and 25 parts of deionized water; wherein the filler includes modified hollow glass microbeads and 3-aminopropyl triethoxysilane modified sepiolite;

[0055] The weight ratio of the modified hollow glass microbeads and the 3-aminopropyl triethoxysilane modified sepiolite is 4:1; the weight ratio of the A component to the curing agent is 9.5:1;

[0056] In the preparation process of the modified hollow glass microbeads, 100 μm hollow glass microbeads are taken, 3 mg / ml dopamine solution (the solvent is Tris-HCl buffer solution with pH=8) is added, and the reaction is stirred at room temperature for 12 h, then filtered, washed with water, and dried to obtain hollow glass microbeads coated with a polydopamine layer;

[0057] The 3-aminopropyl triethoxysilane modified porous nanometer titanium dioxide (the particle size of the porous nanometer titanium dioxide is ≤100 nm, the porosity is 6%, and the pore size is ≤10 nm) is uniformly dispersed in deionized water to make the mass fraction 6wt%, and the pH is adjusted to 4.5, then the hollow glass microbeads coated with a polydopamine layer are added, and the reaction is stirred at room temperature for 9 h, then filtered, washed with water, and dried to obtain intermediate particles.

[0058] The intermediate particles in 1 are mixed with an ethanol solution containing 1.2 g of octa-epoxy cyclohexyl ethyl cage-shaped polyhedral silsesquioxane, the temperature is raised to 65°C, and the reaction is stirred for 9 h, then filtered, washed, and dried to obtain the modified hollow glass microbeads.

[0059] The preparation method of the above-mentioned infrared-reflecting heat insulation paint includes the following steps: the raw materials of the A component are mixed, and then the A component is mixed with the curing agent to obtain the infrared-reflecting heat insulation paint.

[0060] The dispersant is added into the deionized water and mixed, then the filler is added and stirred to disperse uniformly, then the fluorine-containing acrylic acid and the water-based acrylic acid are added and stirred to mix uniformly to obtain the A component; the A component is mixed with the curing agent to obtain the infrared-reflecting heat insulation paint.

[0061] The A component and the curing agent are stored separately, and the A component and the curing agent are mixed before use of the paint.

[0062] Comparative Example 1

[0063] The "modified hollow glass microbeads" are replaced with "3-aminopropyl triethoxysilane modified porous nanometer titanium dioxide", and the rest is the same as in Example 3.

[0064] Comparative Example 2

[0065] The "modified hollow glass microbeads" are replaced with "unmodified hollow glass microbeads", and the rest is the same as in Example 3.

[0066] Comparative Example 3

[0067] The "modified hollow glass microbeads" are replaced with "intermediate particles of Example 3", and the rest is the same as in Example 3.

[0068] A steel plate is taken, cleaned with a cloth and ethanol in turn, and dried; then the surface is roughened by circling with water sandpaper, and the metal chips are cleaned before use. The paints prepared in Examples 1-3 and Comparative Examples 1-3 are respectively coated on the surface of the steel plate to be used, dried, and the paint film thickness is about 80 μm, and placed in a constant temperature and humidity chamber with a temperature of 23±2℃ and a humidity of 50-60%, and cured for 48h, and then used for testing various properties. The results are shown in Table 1.

[0069] The near-infrared reflectance is detected according to JG / T235-2014. The heat insulation temperature difference is detected according to JG / T235-2008.

[0070] The pencil hardness is detected according to GB / T6739-2022. The adhesion is detected according to GB / T9286-2021, and the adhesion ability of the paint is rated from 0 level without any damage to 5 level with serious damage.

[0071] Table 1 Test Results

[0072] Test item Near infrared reflectance Thermal insulation temperature difference (°C) Water contact angle (°) Pencil hardness Adhesion rating Example 1 0.77 7.0 152 3H 0 Example 2 0.80 7.5 154 3H 0 Example 3 0.79 7.3 153 3H 0 Comparative Example 1 0.81 6.6 80 2H 0 Comparative Example 2 0.38 4.0 94 3H 2 Comparative Example 3 0.79 7.2 85 3H 0

[0073] As can be seen from Table 1, compared with Comparative Examples 1-3, the paint film of the present application has good infrared reflection and heat insulation performance, and the water contact angle is much larger than that of Comparative Examples 1-3, and the anti-fouling performance is good, and the hardness and adhesion of the paint film of the present application are good.

[0074] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change according to the technical solution and inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An infrared-reflective, heat-reflective, heat-sealable paint, characterized in that, The raw materials of the A component and the curing agent; the raw materials of the A component include 50 parts of film-forming resin, 20-30 parts of filler, 2-3 parts of dispersant, and 20-30 parts of water by weight; wherein the filler includes modified hollow glass microbeads and modified sepiolite; In the preparation process of the modified hollow glass microbeads, a polydopamine layer is coated on the surface of the hollow glass microbeads, and then mixed with the amino-grafted porous nanometer titanium dioxide aqueous solution, stirred and reacted, and then solid-liquid separated to obtain intermediate particles; the intermediate particles are reacted with the POSS containing epoxy groups to obtain the modified hollow glass microbeads; In the preparation process of the modified hollow glass microbeads, the particle size of the hollow glass microbeads is 50-200 μm; In the preparation process of the modified hollow glass microbeads, the particle size of the porous nanometer titanium dioxide is ≤100 nm, the porosity is 5-8%, and the pore size is ≤10 nm; The modified sepiolite is a silane coupling agent grafted modified sepiolite containing amino groups; The weight ratio of the modified hollow glass microbeads to the modified sepiolite is 2-4:1; The film-forming resin is one of acrylic resin, epoxy resin, and isocyanate resin; The weight ratio of the A component to the curing agent is 9-10:

1.

2. The infrared-reflective, heat-protective paint according to claim 1, characterized in that In the preparation process of the modified hollow glass microbeads, the stirring reaction is a room temperature stirring reaction for 8-10 h.

3. The infrared-reflective, heat-protective paint of claim 1, wherein, In the preparation process of the modified hollow glass microbeads, the mass fraction of the amino-grafted porous nanometer titanium dioxide aqueous solution is 5-7 wt%.

4. The infrared-reflective, heat-protective paint of claim 1, wherein, In the preparation process of the modified hollow glass microbeads, the pH value of the amino-grafted porous nanometer titanium dioxide aqueous solution is 4-5.

5. The infrared-reflective, heat-protective paint of claim 1, wherein, In the preparation process of the modified hollow glass microbeads, the amino-grafted porous nanometer titanium dioxide is a silane coupling agent grafted modified porous nanometer titanium dioxide containing amino groups.

6. The infrared-reflective, heat-protective paint of claim 1, wherein, In the preparation process of the modified hollow glass microbeads, the POSS containing epoxy groups is an octa-epoxy cyclohexyl ethyl cage-shaped polyhedral oligomeric silsesquioxane.

7. The infrared-reflective, heat-protective paint of claim 1, wherein, In the preparation process of the modified hollow glass microbeads, the temperature for the reaction of the intermediate particles with the POSS containing epoxy groups is 60-70℃, and the time is 8-10 h.

8. The infrared-reflective, heat-protective paint of claim 1, wherein, In the preparation process of the modified hollow glass microbeads, the weight ratio of the intermediate particles to the POSS containing epoxy groups is 1:1-1.

5.

9. The infrared-reflective, heat-protective paint of claim 1, wherein, In the preparation process of the modified hollow glass microbeads, the reaction solvent of the intermediate particles and the POSS containing epoxy groups is ethanol.

10. A process for the production of an infrared-reflective thermal barrier paint according to any one of claims 1 to 9, characterized in that The method comprises the following steps: mixing the raw materials of the A component, and then mixing with the curing agent to obtain the infrared reflective thermal insulation paint. The method comprises the following steps: mixing the raw materials of the A component, and then mixing with the curing agent to obtain the infrared reflective thermal insulation paint.