Thermal insulation coating and preparation method thereof

Abstract

The present application discloses a thermal insulation coating and a preparation method thereof. On the one hand, the present application provides a thermal insulation coating, comprising the following raw materials in parts by mass: 30 to 45 parts of aqueous film-forming resin emulsion, 6 to 12 parts of liquid silica gel, 2 to 5 parts of dodecyl alcohol ester, 6 to 10 parts of barium sulfate micropowder, 4 to 8 parts of titanium dioxide, 40 to 70 parts of ceramic micropowder, 2 to 5 parts of additives, and 10 to 18 parts of deionized water. On the other hand, the present application also provides a preparation method for the above-mentioned thermal insulation coating. The present application has excellent thermal insulation performance, good overall strength, and excellent adhesion performance.

Description

Technical Field

[0001] The present application relates to the technical field of architectural coatings, and in particular to a thermal insulation coating and a preparation method thereof. Background Art

[0002] Thermal insulation coatings, a functional architectural coating that has gained popularity in recent years, offer excellent thermal insulation and insulation, effectively insulating and cooling buildings and reducing energy consumption. Due to their ease of application, they have completely replaced water sprinkler systems, insulation cotton, foam sponge, and laminated iron, becoming the preferred solution for building energy conservation. Thermal insulation coatings are primarily categorized into three types based on their properties: conductive insulation, reflective insulation, and radiant insulation.

[0003] Barrier-type thermal insulation coatings achieve thermal insulation through their inherent high thermal resistance, resulting in thick-film coatings. Because the material has low thermal conductivity after drying, the coating has a certain ability to slow heat transfer. However, due to their high shrinkage during the drying cycle, high moisture absorption, low wall adhesion, and limited decorative properties, these thermal insulation coatings are rarely used for exterior wall coatings.

[0004] Reflective thermal insulation coatings, also known as solar heat reflective coatings, are made by adding ultra-fine porous materials or hollow glass microspheres to the coating. By selecting appropriate resins, metals, or metal oxide pigments, fillers, and production processes, a highly reflective coating is created. This coating reflects sunlight to achieve thermal insulation. This insulation principle is primarily due to its high thermal reflectivity, which effectively reduces both radiative and convective heat transfer.

[0005] Radiant thermal insulation coatings are different from the above two coatings. The mechanism of action of this type of coating is to emit the sunlight and heat absorbed by the building into the air in a certain wavelength in the form of radiation, blocking the transfer of heat energy and reducing the heat gain of the building, thereby achieving good thermal insulation and energy-saving effects.

[0006] However, the above-mentioned coating needs to be filled with hollow insulating particles, and a certain filling amount needs to be ensured to meet the requirements of thermal insulation performance. In addition to the filling of reflective fillers, the powder content filled in the coating is relatively large, the overall strength is insufficient, and it is easy to crack and fall off. Summary of the Invention

[0007] In order to solve at least one of the above technical problems, a thermal insulation coating with excellent thermal insulation performance, good overall strength and excellent adhesion performance is developed. The present application provides a thermal insulation coating and a preparation method thereof.

[0008] On the one hand, the present application provides a thermal insulation coating, comprising the following raw materials in parts by mass: 30 to 45 parts of aqueous film-forming resin emulsion, 6 to 12 parts of liquid silicone rubber, 2 to 5 parts of dodecyl alcohol ester, 6 to 10 parts of barium sulfate micropowder, 4 to 8 parts of titanium dioxide, 50 to 70 parts of ceramic micropowder, 2 to 5 parts of additives, and 10 to 18 parts of deionized water.

[0009] By adopting the above-mentioned technical scheme, the present application uses water-based film-forming resin emulsion as the main resin material, and adds liquid silicone and dodecyl alcohol ester, which can effectively increase the viscosity and bonding properties of the resin, and is beneficial to the resin film formation. After the introduction of liquid silicone, the bonding strength of the coating after film formation is effectively improved, and it can accommodate more powder filling without powder falling, and the overall strength and adhesion performance of the coating are effectively enhanced; the present application uses barium sulfate micropowder and titanium dioxide as color fillers, which can effectively reflect ultraviolet rays and sunlight, and improve the thermal insulation performance of the coating; the present application uses ceramic micropowder as thermal insulation filler, and the amount of ceramic micropowder added exceeds the amount of the main resin, so that the coating has an extremely low thermal conductivity coefficient and excellent thermal insulation performance.

[0010] Optionally, the aqueous film-forming resin is an aqueous acrylic resin emulsion.

[0011] Optionally, the liquid silica gel uses liquid silica gel with a molecular weight of 400,000 to 600,000 g / mol.

[0012] By adopting the above technical solution, the present application uses a specific aqueous film-forming resin emulsion and liquid silicone with a specific molecular weight, which can further enhance the bonding performance of the coating, while further improving the overall strength and adhesion performance of the coating after film formation.

[0013] Optionally, the thermal insulation coating further includes 8 to 12 parts of calcium carbonate and 4 to 8 parts of white carbon black.

[0014] Optionally, the particle size of the ceramic micropowder is controlled within 200 μm.

[0015] Optionally, the thermal insulation coating further includes 4 to 8 parts of ramie staple fibers.

[0016] By adopting the above technical solution, after adding ramie staple fibers, the present application can greatly enhance the tensile strength of the coating after film formation, while also improving the thermal insulation performance of the coating.

[0017] Optionally, the auxiliary agent includes at least a dispersant and a leveling agent.

[0018] On the other hand, the present application also provides a method for preparing the above-mentioned thermal insulation coating, which is characterized by comprising the following steps:

[0019] S1. The aqueous film-forming resin emulsion, liquid silica gel and lauryl alcohol ester in the formulated amount are sheared and stirred in a high-speed shear mixer to fully mix to prepare a mixed emulsion;

[0020] S2. Mix and stir the formulated amount of barium sulfate powder, titanium dioxide, additives and deionized water to form a slurry;

[0021] S3, adding the slurry prepared in step S2 to the mixed emulsion prepared in step S1, shearing and stirring in a high-speed shear mixer, and fully mixing to prepare a base coating;

[0022] S4. Add the formulated amount of ceramic micropowder to the base coating prepared in step S3, stir and mix thoroughly, and then disperse by ultrasonication to obtain a finished thermal insulation coating.

[0023] By adopting the above-mentioned technical solution, the present application adopts the process steps of first configuring the resin system, then adding fillers and additives, and finally adding ceramic micropowder for mixing, which can effectively ensure that the raw materials of each component are fully dispersed in the coating system; the present application adopts high-speed shear stirring to configure the mixed resin, and uses ultrasonic dispersion to disperse the ceramic micropowder, which can effectively ensure that the aqueous film-forming resin emulsion and liquid silicone can be fully mixed, and at the same time ensure that the ceramic micropowder can be dispersed as evenly as possible in the coating system, thereby effectively improving the strength and thermal insulation performance of the coating.

[0024] Optionally, in step S1 and step S3, the stirring speed of the shear stirring is controlled to be above 1500 rpm, and the stirring time is above 20 min.

[0025] Optionally, in step S4, the stirring and mixing speed is controlled at 600-800 rpm, and the time is controlled at 30-60 min; the ultrasonic dispersion power is controlled at 2000-3000 W, and the time is controlled at 15-30 min.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects:

[0027] 1. This application uses water-based film-forming resin emulsion as the main resin material, and adds liquid silicone and dodecyl alcohol ester, which can effectively increase the viscosity and bonding properties of the resin, and is beneficial to the resin film formation. After the introduction of liquid silicone, the bonding strength of the coating after film formation is effectively improved, and it can accommodate more powder filling without powder falling, and the overall strength and adhesion performance of the coating are effectively enhanced.

[0028] 2. This application uses barium sulfate micropowder and titanium dioxide as pigments and fillers, which can effectively reflect ultraviolet rays and sunlight and improve the thermal insulation performance of the coating.

[0029] 3. This application uses ceramic micropowder as a thermal insulation filler, and the amount of ceramic micropowder added exceeds the amount of the main resin, so that the coating has an extremely low thermal conductivity coefficient and extremely excellent thermal insulation performance.

[0030] 4. This application adopts the process steps of first preparing the resin system, then adding fillers and additives, and finally adding ceramic micropowder for mixing, which can effectively ensure that the raw materials of each component are fully dispersed in the coating system; this application adopts high-speed shear stirring to prepare the mixed resin, and uses ultrasonic dispersion to disperse the ceramic micropowder, which can effectively ensure that the aqueous film-forming resin emulsion and liquid silicone can be fully mixed, and at the same time ensure that the ceramic micropowder can be dispersed as evenly as possible in the coating system, thereby effectively improving the strength and thermal insulation performance of the coating. DETAILED DESCRIPTION

[0031] The present application is further described in detail below with reference to the embodiments.

[0032] The present application designs a thermal insulation coating, which includes the following raw materials in parts by mass: 30-45 parts of aqueous film-forming resin emulsion, 6-12 parts of liquid silicone rubber, 2-5 parts of dodecyl alcohol ester, 6-10 parts of barium sulfate micropowder, 4-8 parts of titanium dioxide, 50-70 parts of ceramic micropowder, 2-5 parts of additives, and 10-18 parts of deionized water.

[0033] The thermal insulation coating of the present application is prepared by the following method, comprising the following steps:

[0034] S1. The aqueous film-forming resin emulsion, liquid silica gel and lauryl alcohol ester in the formulated amount are sheared and stirred in a high-speed shear mixer to fully mix to prepare a mixed emulsion;

[0035] S2. Mix and stir the formulated amount of barium sulfate powder, titanium dioxide, additives and deionized water to form a slurry;

[0036] S3, adding the slurry prepared in step S2 to the mixed emulsion prepared in step S1, shearing and stirring in a high-speed shear mixer, and fully mixing to prepare a base coating;

[0037] S4. Add the formulated amount of ceramic micropowder to the base coating prepared in step S3, stir and mix thoroughly, and then disperse by ultrasonication to obtain a finished thermal insulation coating.

[0038] The following are examples of this application

[0039] The sources of the raw materials in this application are as follows:

[0040] Water-based silicone resin emulsion - Hubei Longsheng Sihai New Materials Co., Ltd.; water-based polyurethane emulsion - Guangzhou Ruilin New Materials Co., Ltd.; water-based acrylic resin emulsion - Beijing Bailichuan Industry and Trade Co., Ltd.; liquid silicone rubber - Zhejiang Jutai New Materials Technology Co., Ltd.; dodecanol ester - Hubei Kewode Chemical Co., Ltd.; micron-grade barium sulfate powder, micron-grade titanium dioxide, micron-grade white carbon black - Langfang Pengcai Fine Chemical Co., Ltd.; nano-grade calcium carbonate - Wuhan Xinyang Ruihe Chemical Technology Co., Ltd.; alumina ceramic powder - Shanghai Qingbei New Materials Technology; ramie staple fiber - Langfang Kaixin Sealing Materials Co., Ltd.; LP190 dispersant - Shanghai Lanpa New Materials Technology Co., Ltd.; LD-108A water-based coating leveling agent - Yangzhou Lida Resin Co., Ltd.

[0041] The following are Examples 1 to 6 of the present application, and the specific proportions are shown in Table 1.

[0042] Examples 1 to 6 of the present application were prepared using the following method, including the following steps:

[0043] S1. The aqueous film-forming resin emulsion, liquid silica gel and lauryl alcohol ester in the formula amount were sheared and stirred in a high-speed shear mixer at a speed of 2000 rpm for 30 min to obtain a mixed emulsion;

[0044] S2. Mix and stir the formulated amount of barium sulfate powder, titanium dioxide, additives and deionized water to form a slurry;

[0045] S3. Add the slurry prepared in step S2 to the mixed emulsion prepared in step S1, and stir in a high-speed shear mixer at 2000 rpm for 30 minutes to fully mix to prepare a base coating;

[0046] S4. Add the formulated amount of ceramic micropowder to the base coating prepared in step S3, stir and mix at a speed of 800 rpm for 30 minutes, and then ultrasonically disperse for 10 minutes with the ultrasonic power controlled at 1500 W to obtain a finished thermal insulation coating.

[0047] Table 1 Raw material ratios for Examples 1 to 6

[0048] Raw material name Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Resin emulsion 30 servings 35 servings 40 servings 45 servings 38 servings 38 servings Liquid silicone 6 servings 10 servings 8 servings 12 servings 10 servings 10 servings Dodecyl alcohol ester 3 servings 2 servings 4 servings 5 servings 3 servings 3 servings barium sulfate 6 servings 8 servings 10 servings 9 servings 8 servings 8 servings Titanium dioxide 4 servings 5 servings 7 servings 8 servings 6 servings 6 servings Ceramic powder 50 servings 60 servings 65 servings 70 servings 64 servings 68 servings dispersants 1 serving 2 servings 3 servings 4 servings 3 servings 3 servings Leveling agent 1 serving 1 serving 1 serving 1 serving 1 serving 1 serving Deionized water 10 servings 13 servings 16 servings 18 servings 14 servings 14 servings

[0049] The aqueous film-forming resin emulsion in Examples 1 to 6 of the present application uses aqueous silicone resin emulsion, and the liquid silicone rubber uses silicone rubber with a molecular weight of 200,000 g / mol.

[0050] The Y33 water-based thermal insulation coating produced by Guangdong Huolun Building Materials Technology Development Co., Ltd. is used as comparative example 1; the optimal embodiment of the invention patent with publication number CN116656189A and invention name as a liquid thermal insulation, anti-corrosion and environmentally friendly coating and its preparation method is used as comparative example 2.

[0051] The waterproof performance, tensile strength, adhesion and thermal conductivity of the coatings of Examples 1 to 6 of the present application and the coatings of Comparative Examples 1 to 2 after film formation were tested, and the results are shown in Table 2.

[0052] Among them, the waterproofness is tested according to the method of GB / T 1733-1993, the tensile strength is tested according to the method of GB / T 16777-2008, the adhesion is tested according to the method of GB / T 5210-2006, and the thermal conductivity is tested according to GB / T 10297-2015.

[0053] Table 2 Performance test results of Examples 1 to 6

[0054]

[0055] The data in Table 1 show that the coatings of Examples 1 to 6 of the present application have excellent waterproof properties after film formation, with tensile strength and adhesion far exceeding those of the coatings of Comparative Examples 1 and 2. The thermal conductivity is also relatively low, within 0.2 W / (m·K), which is close to that of the coating of Comparative Example 2. It can be seen that the coatings of the present application have excellent comprehensive performance.

[0056] It can also be seen from the data in Table 1 that when the present application adopts the ratios of Example 5 and Example 6, the performance is relatively optimal.

[0057] The applicant has optimized the selection of raw materials for this application. The following are Examples 7 to 10 of this application, which are based on Example 6.

[0058] Example 7

[0059] The difference between this embodiment and embodiment 6 is that the water-based film-forming resin emulsion of this embodiment adopts aqueous polyurethane emulsion.

[0060] Example 8

[0061] The difference between this embodiment and embodiment 6 is that the water-based film-forming resin emulsion of this embodiment adopts water-based acrylic resin emulsion.

[0062] Example 9

[0063] The difference between this embodiment and embodiment 8 is that the liquid silica gel in this embodiment uses liquid silica gel with a molecular weight of 400,000 g / mol.

[0064] Example 10

[0065] The difference between this embodiment and embodiment 8 is that the liquid silica gel in this embodiment uses liquid silica gel with a molecular weight of 600,000 g / mol.

[0066] Example 11

[0067] The difference between this embodiment and embodiment 8 is that the liquid silica gel in this embodiment uses liquid silica gel with a molecular weight of 700,000 g / mol.

[0068] Example 12

[0069] The difference between this embodiment and embodiment 10 is that the ceramic micropowder of this embodiment uses powder with a particle size of less than 200 μm.

[0070] The various properties of the coatings of Examples 7 to 12 of the present application were tested, and the results are shown in Table 3.

[0071] Table 3 Performance test results of Examples 7 to 12

[0072]

[0073] It can be seen from the data in Table 3 that when the film-forming resin emulsion of the present application adopts a water-based acrylic resin emulsion, the tensile strength and adhesion of the coating can be effectively improved. The water-based acrylic resin can be better integrated with the liquid silicone, and the bonding performance of the resulting mixed resin material is better, and the overall strength of the coating is also greater.

[0074] The data in Table 3 also demonstrates that the molecular weight of the selected liquid silicone significantly impacts the performance of the coatings used in this application. A molecular weight of 400,000 to 600,000 g / mol is optimal. Within this range, the higher the molecular weight, the better the coating performance. However, above 600,000 g / mol, the coating's performance declines. Applicants speculate that excessively high molecular weight of liquid silicone leads to increased hardness and decreased toughness of the resulting film, which in turn affects the coating's tensile strength and adhesion, impacting its bonding properties.

[0075] The data in Table 3 also show that when ceramic micropowder with a particle size of no more than 200 μm is used in this application, the various properties of the coating are significantly improved. The applicant speculates that reducing the particle size of the ceramic powder can be more conducive to ultrasonic dispersion of the ceramic powder, thereby comprehensively improving the performance of the coating.

[0076] The applicant further optimized the ratio of the present application and added some components and / or fillers. The following are Examples 13 to 18 of the present application, which are based on Example 12 of the present application.

[0077] Example 13

[0078] The difference between this embodiment and embodiment 12 is that 8 parts of calcium carbonate and 4 parts of white carbon black are added to the raw materials.

[0079] Example 14

[0080] The difference between this embodiment and embodiment 12 is that 10 parts of calcium carbonate and 6 parts of white carbon black are added to the raw materials.

[0081] Example 15

[0082] The difference between this embodiment and embodiment 12 is that 12 parts of calcium carbonate and 8 parts of white carbon black are added to the raw materials.

[0083] Example 16

[0084] The difference between this embodiment and embodiment 14 is that 4 parts of ramie staple fibers are added to the raw materials.

[0085] Example 17

[0086] The difference between this embodiment and embodiment 14 is that 6 parts of ramie staple fibers are added to the raw materials.

[0087] Example 18

[0088] The difference between this embodiment and embodiment 14 is that 8 parts of ramie staple fibers are added to the raw materials.

[0089] The various properties of the coatings of Examples 13 to 18 of the present application were tested, and the results are shown in Table 4.

[0090] Table 3 Performance test results of Examples 13 to 18

[0091]

[0092]

[0093] It can be seen from the data in Table 4 that after the filler was added in the present application, the strength and adhesion of the coating were further improved; in addition, after the ramie fiber was added in the present application, the strength of the coating was further significantly improved.

[0094] The applicant has further optimized the preparation process of the present application. The following are Examples 19 to 24 of the present application, which are based on Example 18.

[0095] Example 19

[0096] The difference between this embodiment and embodiment 18 is that, during the preparation of this embodiment, the stirring speed of step S1 and step S3 is 1500 rpm, and the stirring time is 20 min.

[0097] Example 20

[0098] The difference between this embodiment and embodiment 18 is that, during the preparation of this embodiment, the stirring speed of step S1 and step S3 is 1800 rpm, and the stirring time is 30 min.

[0099] Example 21

[0100] The difference between this embodiment and embodiment 18 is that, during the preparation of this embodiment, the stirring speed of step S4 is 600 rpm and the stirring time is 60 min.

[0101] Example 22

[0102] The difference between this embodiment and embodiment 18 is that, during the preparation of this embodiment, the stirring speed of step S4 is 800 rpm and the stirring time is 60 min.

[0103] Example 23

[0104] The difference between this embodiment and embodiment 22 is that, during the preparation of this embodiment, the ultrasonic time in step S4 is 15 minutes and the ultrasonic power is 2000W.

[0105] Example 24

[0106] The difference between this embodiment and embodiment 23 is that, in the preparation of this embodiment, the ultrasonic time in step S4 is 30 minutes and the ultrasonic power is 3000W.

[0107] The various properties of the coatings of Examples 19 to 25 of the present application were tested, and the results are shown in Table 5.

[0108] Table 5 Performance test results of Examples 19 to 25

[0109]

[0110] It can be seen from the data in Table 5 that after the preparation process of the present application was optimized, the performance of the coating was further improved. In particular, after adopting higher power and longer ultrasonic dispersion, the thermal conductivity of the present application was significantly reduced. It can be seen that ultrasonic dispersion can effectively ensure the uniform dispersion of ceramic micropowders, thereby improving thermal insulation performance.

[0111] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A thermal insulation coating, characterized in that: The invention comprises the following raw materials in parts by mass: 30 to 45 parts of aqueous film-forming resin emulsion, 6 to 12 parts of liquid silica gel, 2 to 5 parts of dodecyl alcohol ester, 6 to 10 parts of barium sulfate micropowder, 4 to 8 parts of titanium dioxide, 50 to 70 parts of ceramic micropowder, 2 to 5 parts of additives, and 10 to 18 parts of deionized water; the aqueous film-forming resin adopts aqueous acrylic resin emulsion; the molecular weight of the liquid silica gel is 400,000 to 600,000 g / mol; the thermal insulation coating also includes 4 to 8 parts of ramie staple fibers.

2. A thermal insulation coating according to claim 1, characterized in that: The thermal insulation coating further comprises 8 to 12 parts of calcium carbonate and 4 to 8 parts of white carbon black.

3. The thermal insulation coating according to claim 1, characterized in that: The particle size of the ceramic micropowder is controlled within 200 μm.

4. The thermal insulation coating according to claim 1, characterized in that: The auxiliary agent at least includes a dispersant and a leveling agent.

5. The method for preparing a thermal insulation coating according to claim 1, wherein: The following steps are involved: S1. The aqueous film-forming resin emulsion, liquid silica gel and lauryl alcohol ester in the formulated amount are sheared and stirred in a high-speed shear mixer to fully mix to prepare a mixed emulsion; S2. Mix and stir the formulated amount of barium sulfate powder, titanium dioxide, additives and deionized water to form a slurry; S3, adding the slurry prepared in step S2 to the mixed emulsion prepared in step S1, shearing and stirring in a high-speed shear mixer, and fully mixing to prepare a base coating; S4. Add the formulated amount of ceramic micropowder to the base coating prepared in step S3, stir and mix thoroughly, and then disperse by ultrasonication to obtain a finished thermal insulation coating.

6. The method for preparing a thermal insulation coating according to claim 5, characterized in that: In step S1 and step S3, the stirring speed of the shear stirring is controlled to be above 1500 rpm, and the stirring time is above 20 minutes.

7. The method for preparing a thermal insulation coating according to claim 5, characterized in that: In step S4, the stirring and mixing speed is controlled at 600-800 rpm and the time is controlled at 30-60 min; the ultrasonic dispersion power is controlled at 2000-3000 W and the time is controlled at 15-30 min.

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