Building external wall thermal insulation material and preparation method thereof

Abstract

The invention relates to the technical field of thermal insulation materials, and particularly discloses a building external wall thermal insulation material and a preparation method thereof. The invention relates to a building external wall thermal insulation material, which is prepared from the following ingredients in parts by weight: 50 to 80 parts of cement, 25 to 35 parts of polyacrylate emulsion, 15 to 25 parts of expanded perlite, 0.2 to 0.5 part of water reducing agents, 5 to 8 parts of foaming agents, 5 to 10 parts of nanometer aluminum oxide crystal whiskers, 5 to 10 parts of hollow glass microspheres, 7 to 16 parts of potassium hexatitanate crystal whiskers, 3 to 7 parts of sodium alginate-silicon dioxide aerogel and 2 to 10 parts of wood fibers. And 8-14 parts of water. The preparation method of the building external wall thermal insulation material comprises the following steps: uniformly mixing the raw materials in parts by weight, injecting the mixture into a mold for forming, removing the mold after initial setting, maintaining, and cutting into building blocks or plates according to design size requirements after reaching certain strength. The building external wall thermal insulation material is good in thermal insulation performance.

Description

Technical Field

[0001] The present application relates to the technical field of thermal insulation materials, and in particular to a thermal insulation material for building exterior walls and a preparation method thereof. Background Art

[0002] With the accelerated development of global industrialization, energy shortage and environmental degradation are becoming increasingly prominent. Energy conservation and consumption reduction have become a key path to promote sustainable development of the global economy. In China, the energy consumption of the construction industry accounts for a large proportion, so it is particularly important to implement energy conservation and consumption reduction in construction projects. The use of exterior wall insulation materials is an important means to achieve building energy conservation. The quality of exterior wall insulation materials directly determines the effect of building energy conservation and its durability. Therefore, it is very important to develop exterior wall insulation materials with excellent comprehensive performance and stability.

[0003] At present, building exterior wall insulation materials are mainly divided into two categories: organic and inorganic. Organic insulation materials, such as organic foam boards, have significant insulation effects, but are more complicated to construct, and have insufficient durability and the risk of fire. In contrast, inorganic insulation materials have strong adhesion, good environmental protection properties and weather resistance, and are easy to construct. However, they have higher density and relatively weaker thermal insulation performance. Summary of the invention

[0004] In order to solve at least one of the above technical problems and develop a building exterior wall material with good thermal insulation performance, the present application provides a building exterior wall thermal insulation material and a preparation method thereof.

[0005] On the one hand, the present application provides a building exterior wall insulation material, which includes the following components by weight: 50-80 parts of cement, 25-35 parts of polyacrylate emulsion, 15-25 parts of expanded perlite, 0.2-0.5 parts of water reducer, 5-8 parts of foaming agent, 5-10 parts of nano alumina whiskers, 5-10 parts of hollow glass microspheres, 7-16 parts of potassium hexatitanate whiskers, 3-7 parts of sodium alginate-silicon dioxide aerogel, 2-10 parts of wood fiber, and 8-14 parts of water.

[0006] By adopting the above technical scheme, the present application combines the advantages of a variety of high-performance materials, not only improving the thermal insulation effect, but also taking into account mechanical strength, weather resistance, construction convenience and environmental protection requirements. These characteristics make the material suitable for modern building exterior wall insulation systems, can effectively meet the needs of building energy conservation, and have good market application prospects. Potassium hexatitanate whiskers have high strength and modulus, and can significantly improve the tensile strength of composite materials. The addition of potassium hexatitanate whiskers can improve the flexural strength of the material, enhance the toughness of the material, and, due to its slender structure, potassium hexatitanate whiskers can effectively disperse stress, thereby improving the impact resistance of the material. Sodium alginate-silicon dioxide aerogel has the characteristics of high porosity, which is conducive to the formation of an effective thermal insulation layer, which can significantly reduce the thermal conductivity of the material and improve the thermal insulation effect.

[0007] Optionally, the preparation method of the sodium alginate-silicon dioxide aerogel comprises the following steps: S1. Dissolve sodium alginate in water to form a sodium alginate solution, add tetraethoxysilane, stir and adjust the pH to 3.8-4.2, stir at a constant temperature for 6-8 hours, then add methyltrimethoxysilane, let stand and age for 40-46 hours to obtain a gel; S2, continuously exchanging the solvent of the gel obtained in step S1 with water, and then performing vacuum freezing treatment to obtain the sodium alginate-silicon dioxide aerogel.

[0008] Optionally, in step S1, the mass concentration of the sodium alginate solution is 20-30wt%, and the volume ratio of the sodium alginate solution, tetraethoxysilane and silane coupling agent is 10:1-2:0.6-1.2.

[0009] Optionally, the weight ratio of the potassium hexatitanate whiskers to the sodium alginate-silicon dioxide aerogel is 2-2.8:1.

[0010] Optionally, the weight ratio of the potassium hexatitanate whiskers to the sodium alginate-silicon dioxide aerogel is 2.3:1.

[0011] By adopting the above technical solution, the synergistic effect of potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel can significantly improve the thermal insulation effect of the material. The potassium hexatitanate whiskers provide mechanical support, making the material less susceptible to damage due to external forces during long-term use, thereby maintaining the continued effectiveness of the thermal insulation material, while the aerogel is responsible for minimizing the transfer of heat through the material.

[0012] Optionally, the total weight of the potassium hexatitanate whiskers and the sodium alginate-silicon dioxide aerogel accounts for 9.3-12.5% ​​of the total weight of the building exterior wall thermal insulation material.

[0013] Optionally, the total weight of the potassium hexatitanate whiskers and the sodium alginate-silicon dioxide aerogel accounts for 11% of the total weight of the building exterior wall thermal insulation material.

[0014] By adopting the above technical scheme, the present application limits the usage ratio and total weight proportion of sodium alginate-silicon dioxide aerogel and potassium hexatitanate whiskers, which can systematically optimize the thermal management, cost-effectiveness, processing performance, environmental adaptability and long-term durability of building exterior wall insulation materials, and improve the comprehensive performance of environmentally friendly materials.

[0015] Optionally, the foaming agent is N-dodecylethanolamine.

[0016] Optionally, the water reducer is polyether polycarboxylate water reducer PC-2.

[0017] On the second aspect, the present application provides a method for preparing the above-mentioned building exterior wall insulation material, comprising the following steps: after mixing the raw materials evenly according to weight, injecting them into a mold to form, removing the mold and curing after initial setting, and cutting them into blocks or panels according to design size requirements after reaching a certain strength.

[0018] By adopting the above technical scheme, the preparation method of the building exterior wall insulation material provided by the present application is simple to operate, highly controllable, suitable for industrial production, and has broad application prospects.

[0019] In summary, the present invention includes at least one of the following beneficial technical effects: 1. This application combines the advantages of a variety of high-performance materials, not only improving the thermal insulation effect, but also taking into account mechanical strength, weather resistance, construction convenience and environmental protection requirements. These characteristics make the material suitable for modern building exterior wall insulation systems, can effectively meet the needs of building energy conservation, and have good market application prospects. Potassium hexatitanate whiskers have high strength and modulus, and can significantly improve the tensile strength of composite materials. The addition of potassium hexatitanate whiskers can improve the flexural strength of the material, enhance the toughness of the material, and, due to its slender structure, potassium hexatitanate whiskers can effectively disperse stress, thereby improving the impact resistance of the material. Sodium alginate-silica aerogel has the characteristics of high porosity, which is conducive to the formation of an effective thermal insulation layer, which can significantly reduce the thermal conductivity of the material and improve the thermal insulation effect.

[0020] 2. This application limits the usage ratio and total weight proportion of sodium alginate-silicon dioxide aerogel and potassium hexatitanate whiskers, which can systematically optimize the thermal management, cost-effectiveness, processing performance, environmental adaptability and long-term durability of building exterior wall insulation materials, and improve the comprehensive performance of environmentally friendly materials.

[0021] 3. The preparation method of the building exterior wall insulation material provided by the present application can achieve uniform mixing and effective dispersion of raw materials, ensuring that the environmentally friendly materials have excellent environmental protection and high temperature resistance. At the same time, the method is simple to operate, highly controllable, suitable for industrial production, and has broad application prospects. DETAILED DESCRIPTION

[0022] The present application is further described in detail below with reference to the embodiments. Specific embodiments

[0023] Preparation Example 1 The preparation method of the sodium alginate-silicon dioxide aerogel comprises the following steps: S1. Dissolve sodium alginate in water to form a sodium alginate solution with a concentration of 20 wt%, add tetraethoxysilane, stir and adjust the pH to 3.8, stir at a constant temperature for 6 hours, then add methyltrimethoxysilane, let stand and age for 40 hours to obtain a gel; S2, continuously exchanging the solvent of the gel obtained in step S1 with water, and then performing vacuum freezing treatment to obtain the sodium alginate-silicon dioxide aerogel.

[0024] Wherein, the volume ratio of sodium alginate solution, tetraethoxysilane and silane coupling agent is 10:1:0.6.

[0025] Preparation Example 2 The preparation method of the sodium alginate-silicon dioxide aerogel comprises the following steps: S1. Dissolve sodium alginate in water to form a sodium alginate solution with a concentration of 25 wt%, add tetraethoxysilane, stir and adjust the pH to 4, stir at a constant temperature for 7 hours, then add methyltrimethoxysilane, let stand and age for 43 hours to obtain a gel; S2, continuously exchanging the solvent of the gel obtained in step S1 with water, and then performing vacuum freezing treatment to obtain the sodium alginate-silicon dioxide aerogel.

[0026] Wherein, the volume ratio of sodium alginate solution, tetraethoxysilane and silane coupling agent is 10:1.8:0.9.

[0027] Preparation Example 3 The preparation method of the sodium alginate-silicon dioxide aerogel comprises the following steps: S1. Dissolve sodium alginate in water to form a sodium alginate solution with a concentration of 30 wt%, add tetraethoxysilane, stir and adjust the pH to 4.2, stir at a constant temperature for 8 h, then add methyltrimethoxysilane, let stand and age for 46 h to obtain a gel; S2, continuously exchanging the solvent of the gel obtained in step S1 with water, and then performing vacuum freezing treatment to obtain the sodium alginate-silicon dioxide aerogel.

[0028] Wherein, the volume ratio of sodium alginate solution, tetraethoxysilane and silane coupling agent is 10:2:1.2.

[0029] Example 1 A building exterior wall thermal insulation material comprises the following components by weight: 50 parts of cement, 25 parts of polyacrylate emulsion, 15 parts of expanded perlite, 0.2 parts of water reducer, 5 parts of foaming agent, 5 parts of nano alumina whiskers, 5 parts of hollow glass microspheres, 11.5 parts of potassium hexatitanate whiskers, 5 parts of sodium alginate-silicon dioxide aerogel, 2 parts of wood fiber and 8 parts of water.

[0030] Wherein, the foaming agent is N-dodecylethanolamine, the water reducer is polyether polycarboxylic acid water reducer PC-2, and the sodium alginate-silicon dioxide aerogel is prepared by Preparation Example 1.

[0031] A method for preparing a building exterior wall thermal insulation material comprises the following steps: mixing various raw materials uniformly by weight, injecting into a mold to form, removing the mold and performing curing after initial setting, and cutting into blocks according to design size requirements after reaching a certain strength.

[0032] Embodiment 2-5 Example 2 The difference between this embodiment and embodiment 1 is that, when preparing the building exterior wall insulation material, the total weight of the potassium hexatitanate whiskers and the sodium alginate-silicon dioxide aerogel is 16.5 parts, and the weight ratio of the potassium hexatitanate whiskers to the sodium alginate-silicon dioxide aerogel is 2:1.

[0033] Example 3 The difference between this embodiment and embodiment 1 is that, when preparing the building exterior wall insulation material, the total weight of the potassium hexatitanate whiskers and the sodium alginate-silicon dioxide aerogel is 16.5 parts, and the weight ratio of the potassium hexatitanate whiskers to the sodium alginate-silicon dioxide aerogel is 2.5:1.

[0034] Example 4 The difference between this embodiment and embodiment 1 is that, when preparing the building exterior wall insulation material, the total weight of the potassium hexatitanate whiskers and the sodium alginate-silicon dioxide aerogel is 16.5 parts, and the weight ratio of the potassium hexatitanate whiskers to the sodium alginate-silicon dioxide aerogel is 2.8:1.

[0035] Comparative Examples 1-3 Comparative Example 1 The difference between this comparative example and Example 1 is that no sodium alginate-silicon dioxide aerogel is added when preparing the building exterior wall thermal insulation material.

[0036] Comparative Example 2 The difference between this comparative example and Example 1 is that potassium hexatitanate whiskers are not added when preparing the building exterior wall thermal insulation material.

[0037] Comparative Example 3 The difference between this comparative example and Example 1 is that, when preparing the building exterior wall thermal insulation material, potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel are not added.

[0038] Experimental testing: Compressive strength test (test standard GB / T5486) and thermal conductivity test (test standard GB / T10294).

[0039] The experimental test results of Examples 1-4 and Comparative Examples 1-3 are shown in Table 1.

[0040] Table 1 - Experimental test results of Examples 1-4 and Comparative Examples 1-3 Example Compressive strength(MPa) Thermal conductivity (W / (m·K)) Example 1 1.5 0.034 Example 2 1.2 0.037 Example 3 1.3 0.036 Example 4 1.2 0.038 Comparative Example 1 0.9 0.072 Comparative Example 2 1.0 0.076 Comparative Example 3 0.7 0.085 Result analysis: The difference between Examples 2-4 and Example 1 is that when preparing the building exterior wall insulation material, the total weight of potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel is 16.5 parts, and the weight ratio of potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel is different. Combined with the experimental test results in Table 1, it can be seen that when the weight ratio of potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel is 2.3:1, the comprehensive performance of the obtained building exterior wall insulation material is better. The difference between Comparative Example 1 and Example 1 is that when preparing the building exterior wall insulation material, sodium alginate-silicon dioxide aerogel is not added. The difference between Comparative Example 2 and Example 1 is that when preparing the building exterior wall insulation material, potassium hexatitanate whiskers are not added. The difference between Comparative Example 3 and Example 1 is that when preparing the building exterior wall insulation material, potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel are not added. Combined with the experimental test results in Table 1, it can be seen that when preparing building exterior wall insulation materials, the compound use of potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel can better improve the comprehensive performance of the prepared building exterior wall insulation materials.

[0041] Embodiment 5-6 The difference between Example 5-6 and Example 1 is that the weight fractions of some components are changed when preparing the building exterior wall thermal insulation material. See Table 2 for the difference.

[0042] Table 2 - Differences between Examples 5-6 and Example 1 The experimental test results of Examples 5-6 are shown in Table 3.

[0043] Table 3 - Experimental test results of Examples 5-6 Result analysis: The difference between Examples 5-6 and Example 1 is that, when preparing the building exterior wall insulation material, the weight proportions of some components are different. Combined with the experimental test results in Table 3, it can be seen that when preparing the building exterior wall insulation material, the building exterior wall insulation material prepared in Example 6 has better comprehensive performance.

[0044] Examples 7-10 The difference between Examples 7-10 and Example 5 is that when preparing building exterior wall insulation materials, based on the premise that the weight ratio of potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel is 2.3:1, the total weight ratio of potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel in the environmentally friendly antistatic polyurethane elastic is changed, and the optimal weight ratio is selected.

[0045] In Example 5, the total weight of potassium hexatitanate whiskers and sodium alginate-silicon dioxide aerogel is 16.5 parts, and the total weight of the building exterior wall thermal insulation material is 176.8 parts.

[0046] Therefore, it is not difficult to conclude that in Example 5, the proportion of potassium hexatitanate whiskers (referred to as variable 1) and sodium alginate-silicon dioxide aerogel (referred to as variable 2) in the building exterior wall insulation material (referred to as the matrix) is 9.33%.

[0047] The differences between Examples 7-10 and Example 5 are shown in Table 4.

[0048] Proportion = (variable 1 + variable 2) / total weight of matrix * 100%.

[0049] Table 4 - Differences between Examples 7-10 and Example 5 The experimental test results of Examples 7-10 are shown in Table 5.

[0050] Table 5 - Experimental test results of Examples 7-10 Result analysis: The difference between Examples 7-10 and Example 5 is that when preparing the building exterior wall thermal insulation material, when the proportion of potassium hexatitanate whiskers (referred to as variable 1) and sodium alginate-silicon dioxide aerogel (referred to as variable 2) in the building exterior wall thermal insulation material (referred to as the matrix) is between (9.3-12.5)%, the comprehensive performance of the prepared building exterior wall thermal insulation material is better. When the proportion of potassium hexatitanate whiskers (referred to as variable 1) and sodium alginate-silicon dioxide aerogel (referred to as variable 2) in the building exterior wall thermal insulation material (referred to as the matrix) is 11%, the comprehensive performance of the prepared building exterior wall thermal insulation material is better.

[0051] Examples 11-12 Embodiment 11 The difference between this embodiment and embodiment 9 is that, when preparing the building exterior wall thermal insulation material, the preparation parameters of the sodium alginate-silicon dioxide aerogel used are different, and the sodium alginate-silicon dioxide aerogel in this embodiment is prepared by Preparation Example 2.

[0052] Example 12 The difference between this embodiment and embodiment 9 is that when preparing the building exterior wall insulation material, the preparation parameters of the sodium alginate-silicon dioxide aerogel used are different. The sodium alginate-silicon dioxide aerogel in this embodiment is prepared by Preparation Example 3.

[0053] The experimental test results of Examples 11-12 are shown in Table 6.

[0054] Table 6 - Experimental test results of Examples 11-12 Result analysis: The difference between Examples 11-12 and Example 9 is that, when preparing building exterior wall thermal insulation materials, the sodium alginate-silicon dioxide aerogel prepared in Preparation Example 2 can better improve the comprehensive performance of building exterior wall thermal insulation materials.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A building exterior wall thermal insulation material, characterized in that: The composition includes the following components by weight: 50-80 parts of cement, 25-35 parts of polyacrylate emulsion, 15-25 parts of expanded perlite, 0.2-0.5 parts of water reducing agent, 5-8 parts of foaming agent, 5-10 parts of nano alumina whisker, 5-10 parts of hollow glass microspheres, 7-16 parts of potassium hexatitanate whisker, 3-7 parts of sodium alginate-silicon dioxide aerogel, 2-10 parts of wood fiber and 8-14 parts of water.

2. The building exterior wall thermal insulation material according to claim 1, characterized in that: The preparation method of the sodium alginate-silicon dioxide aerogel comprises the following steps: S1. Dissolve sodium alginate in water to form a sodium alginate solution, add tetraethoxysilane, stir and adjust the pH to 3.8-4.2, stir at a constant temperature for 6-8 hours, then add methyltrimethoxysilane, let stand and age for 40-46 hours to obtain a gel; S2, continuously exchanging the solvent of the gel obtained in step S1 with water, and then performing vacuum freezing treatment to obtain the sodium alginate-silicon dioxide aerogel.

3. The building exterior wall thermal insulation material according to claim 2, characterized in that: In the step S1, the mass concentration of the sodium alginate solution is 20-30wt%, and the volume ratio of the sodium alginate solution, tetraethoxysilane and silane coupling agent is 10:1-2:0.6-1.

2.

4. The building exterior wall thermal insulation material according to claim 1, characterized in that: The weight ratio of the potassium hexatitanate whisker to the sodium alginate-silicon dioxide aerogel is 2-2.8:

1.

5. The building exterior wall thermal insulation material according to claim 4, characterized in that: The weight ratio of the potassium hexatitanate whiskers to the sodium alginate-silicon dioxide aerogel is 2.3:

1.

6. The building exterior wall thermal insulation material according to claim 1, characterized in that: The total weight of the potassium hexatitanate whisker and the sodium alginate-silicon dioxide aerogel accounts for 9.3-12.5% ​​of the total weight of the building exterior wall thermal insulation material.

7. The building exterior wall thermal insulation material according to claim 6, characterized in that: The total weight of the potassium hexatitanate whisker and the sodium alginate-silicon dioxide aerogel accounts for 11% of the total weight of the building exterior wall thermal insulation material.

8. The building exterior wall thermal insulation material according to claim 1, characterized in that: The foaming agent is N-dodecylethanolamine.

9. The building exterior wall thermal insulation material according to claim 1, characterized in that: The water reducer is polyether polycarboxylate water reducer PC-2.

10. A method for preparing the building exterior wall thermal insulation material according to any one of claims 1 to 9, characterized in that: The following steps are involved: After the raw materials are evenly mixed according to weight, they are injected into a mold to form. After initial setting, the mold is removed and cured. After reaching a certain strength, it can be cut into blocks or panels according to the design size requirements.

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