Modified silicon dioxide aerogel composite insulation board and preparation method thereof
By adding surfactant and modifier to the silica aerogel and immersing it into the rock wool insulation board, a modified silica aerogel composite insulation board was prepared, which solved the problems of high thermal conductivity of the rock wool insulation board and low strength of the silica aerogel, achieving better insulation and waterproofing performance.
Patent Information
- Application Number
- CN202411850823.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-03-25
AI Technical Summary
The existing rock wool insulation board has a high thermal conductivity and a large water absorption rate, which is difficult to meet the development requirements of building energy conservation. Moreover, the silica aerogel has low strength and poor toughness. It cannot meet the mechanical standards for building alone.
By adding nonionic surfactant and surf modifier to the silica aerogel, a modified silica aerogel solution was prepared and immersed into the rock wool insulation board, and a modified silica aerogel composite insulation board was prepared by normal pressure drying.
It significantly reduces the thermal conductivity of rock wool boards, improves thermal insulation performance, and enhances waterproof performance, meeting building mechanics standards.
Smart Images
Figure BDA0005190527990000041 
Figure BDA0005190527990000051
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of aerogel insulation boards, and in particular to a modified silica aerogel composite insulation board and a preparation method thereof. Background Art
[0002] Rock wool has the functions of thermal insulation, sound absorption and noise reduction, flame retardancy and fire prevention, and can be widely used in the insulation of building exterior walls and roofs. However, its thermal conductivity is relatively high and its water absorption is relatively large, making it increasingly difficult to meet the development requirements of building energy conservation. Silica aerogel is a nano-scale amorphous porous solid material with a three-dimensional spatial network structure. It has the characteristics of low density, low thermal conductivity, high porosity, and large specific surface area. It is a new material with great application prospects. However, silica aerogel has low strength and poor toughness, and it often cannot meet the mechanical standards for construction when used alone.
[0003] In the prior art, rock wool is often combined with silica aerogel, which can not only reduce thermal conductivity and improve thermal insulation capacity, but also maintain fireproof Class A. However, due to technical defects, silica aerogel cannot fully exert its performance, so it is necessary to develop a preparation method of silica aerogel composite insulation board that can significantly reduce the thermal conductivity of rock wool board. Summary of the invention
[0004] One of the purposes of the present invention is to provide a method for preparing a modified silica aerogel composite thermal insulation board.
[0005] The second object of the present invention is to provide a modified silica aerogel composite insulation board prepared by the above preparation method.
[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:
[0007] In a first aspect, the present invention provides a method for preparing a modified silica aerogel composite insulation board, comprising the following steps:
[0008] (1) adding a nonionic surfactant to ethylene glycol and stirring the mixture evenly; then slowly adding silica aerogel powder, stirring at high speed for 20-30 minutes, adding a surface modifier, and continuously stirring at 80-90° C. for 12-24 hours to obtain a modified silica aerogel solution;
[0009] (2) placing a rock wool insulation board in a container, pouring the modified silica aerogel solution prepared in step (1), infiltrating the rock wool insulation board at room temperature and pressure for 20-30 minutes, and then placing it in a ventilated place for volatilization at room temperature; drying the rock wool insulation board infiltrated with the modified silica aerogel solution by a normal pressure drying method, and finally preparing a modified silica aerogel composite insulation board.
[0010] Preferably, the surface modifier is selected from a mixture of one or more of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane or γ-mercaptopropyltrimethoxysilane.
[0011] Preferably, the nonionic surfactant is selected from a mixture of one or more of polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, and alkylphenol polyoxyethylene ether.
[0012] Preferably, the mass ratio of the nonionic surfactant to ethylene glycol is 1-2:14-16.
[0013] Preferably, the mass ratio of the silica aerogel to the surface modifier and ethylene glycol is 3-8:10:70-80.
[0014] Preferably, the drying setting temperature is 60-80° C., and the drying time is 24-48 hours.
[0015] Preferably, the thickness of the rock wool insulation board is 40-50 mm and the density is 120-140 kg / m 3 .
[0016] In a second aspect, the present invention also provides a modified silica aerogel composite insulation board prepared by the above preparation method.
[0017] Compared with the prior art, the present invention uses a surface modifier to hydrophobically modify the hydrophilic SiO2 aerogel, and the rock wool composite insulation board with the hydrophobic SiO2 aerogel added has more obvious hydrophobicity and better waterproof performance. Compared with the rock wool insulation board, the thermal conductivity of the composite insulation board is significantly reduced, and the improvement effect of the thermal insulation performance is good. DETAILED DESCRIPTION
[0018] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The following examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.
[0019] Example 1
[0020] A method for preparing a modified silica aerogel composite insulation board comprises the following steps:
[0021] (1) adding a nonionic surfactant polyoxyethylene sorbitan monolaurate to ethylene glycol, and mixing and stirring uniformly; then slowly adding silica aerogel powder, stirring at a speed of 800 r / min for 25 minutes, and then adding 3-aminopropyltriethoxysilane, and continuously stirring at 80° C. for 12 hours to obtain a modified silica aerogel solution, wherein the content of silica aerogel is 3%, the content of nonionic surfactant is 10%, the content of ethylene glycol is 77%, and the content of 3-aminopropyltriethoxysilane is 10%;
[0022] (2) The rock wool insulation board (thickness 40mm, density 120kg / m 3 ) is placed in a water tank, and the modified silica aerogel solution prepared in step (1) is poured into it, and the rock wool insulation board is infiltrated for 25 minutes under normal temperature and pressure environment, and then placed in a ventilated place for volatilization at room temperature; a normal pressure drying method is adopted, and it is dried at 60°C for 48 hours to finally prepare a modified silica aerogel rock wool composite insulation board.
[0023] Example 2
[0024] The preparation process is the same as that of Example 1, except that the content of silica aerogel is 5%, the content of nonionic surfactant is 7%, the content of ethylene glycol is 78%, and the content of 3-aminopropyltriethoxysilane is 10%.
[0025] Example 3
[0026] The preparation process is the same as that of Example 1, except that the content of silica aerogel is 8%, the content of nonionic surfactant is 5%, the content of ethylene glycol is 77%, and the content of 3-aminopropyltriethoxysilane is 10%.
[0027] Example 4
[0028] A method for preparing a modified silica aerogel composite insulation board comprises the following steps:
[0029] (1) adding a nonionic surfactant polyoxyethylene sorbitan monostearate to ethylene glycol, and mixing and stirring uniformly; then slowly adding silica aerogel powder, stirring at a speed of 800 r / min for 25 minutes, and then adding 3-aminopropyltrimethoxysilane, and continuously stirring at 85° C. for 18 hours to obtain a modified silica aerogel solution, wherein the content of silica aerogel is 3%, the content of nonionic surfactant is 10%, the content of ethylene glycol is 77%, and the content of 3-aminopropyltriethoxysilane is 10%;
[0030] (2) The rock wool insulation board (thickness 40mm, density 140kg / m 3) is placed in a water tank, and the modified silica aerogel solution prepared in step (1) is poured into it, and the rock wool insulation board is infiltrated for 25 minutes under normal temperature and pressure environment, and then placed in a ventilated place for volatilization at room temperature; a normal pressure drying method is adopted, and the solution is dried at 70°C for 30 hours to finally prepare a modified silica aerogel rock wool composite insulation board.
[0031] Example 5
[0032] The preparation process is the same as that of Example 4, except that the content of silica aerogel is 5%, the content of nonionic surfactant is 7%, the content of ethylene glycol is 78%, and the content of 3-aminopropyltriethoxysilane is 10%.
[0033] Example 6
[0034] The preparation process is the same as that of Example 4, except that the content of silica aerogel is 8%, the content of nonionic surfactant is 5%, the content of ethylene glycol is 77%, and the content of 3-aminopropyltriethoxysilane is 10%.
[0035] Example 7
[0036] A method for preparing a modified silica aerogel composite insulation board comprises the following steps:
[0037] (1) adding a nonionic surfactant alkylphenol polyoxyethylene ether to ethylene glycol, mixing and stirring uniformly; then slowly adding silica aerogel powder, stirring at a speed of 800 r / min for 25 minutes, adding γ-mercaptopropyltrimethoxysilane, and continuously stirring at 90° C. for 24 hours to obtain a modified silica aerogel solution, wherein the content of silica aerogel is 3%, the content of nonionic surfactant is 10%, the content of ethylene glycol is 77%, and the content of 3-aminopropyltriethoxysilane is 10%;
[0038] (2) The rock wool insulation board (thickness 50mm, density 120kg / m 3 ) is placed in a water tank, and the modified silica aerogel solution prepared in step (1) is poured into the water tank, and the rock wool insulation board is infiltrated for 25 minutes under normal temperature and pressure environment, and then placed in a ventilated place for volatilization at room temperature; a normal pressure drying method is adopted, and the modified silica aerogel rock wool composite insulation board is finally prepared.
[0039] Example 8
[0040] The preparation process is the same as that of Example 7, except that the content of silica aerogel is 5%, the content of nonionic surfactant is 7%, the content of ethylene glycol is 78%, and the content of 3-aminopropyltriethoxysilane is 10%.
[0041] Example 9
[0042] The preparation process is the same as that of Example 7, except that the content of silica aerogel is 8%, the content of nonionic surfactant is 5%, the content of ethylene glycol is 77%, and the content of 3-aminopropyltriethoxysilane is 10%.
[0043] The thermal conductivity of the modified silica aerogel rock wool composite insulation board was measured using a HS-DR-5 thermal conductivity tester. The results are shown in Table 1.
[0044] Table 1 Thermal conductivity of composite insulation board with different aerogel contents
[0045]
[0046]
[0047] It can be seen from Table 1 that when the thickness and density of the rock wool board are fixed, the thermal conductivity of the composite insulation board decreases monotonically with the increase of the aerogel content. When the aerogel content is fixed, the thermal conductivity of the composite insulation board increases with the increase of the thickness of the rock wool board and increases with the increase of the density of the rock wool board. 3 In the case of no aerogel addition, the thermal conductivity of the composite insulation material is the lowest when 8% aerogel is added, as low as 0.020W / (m·K).
[0048] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.
Claims
1. A method for preparing a modified silica aerogel composite insulation board, characterized in that: The following steps are involved: (1) adding a nonionic surfactant to ethylene glycol and stirring the mixture evenly; then slowly adding silica aerogel powder, stirring at high speed for 20-30 minutes, adding a surface modifier, and continuously stirring at 80-90° C. for 12-24 hours to obtain a modified silica aerogel solution; (2) placing a rock wool insulation board in a container, pouring the modified silica aerogel solution prepared in step (1), infiltrating the rock wool insulation board at room temperature and pressure for 20-30 minutes, and then placing it in a ventilated place for volatilization at room temperature; drying the rock wool insulation board infiltrated with the modified silica aerogel solution by a normal pressure drying method, and finally preparing a modified silica aerogel rock wool composite insulation board.
2. The method for preparing a modified graphene aerogel composite insulation board according to claim 1, characterized in that: The surface modifier is selected from a mixture of one or more of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane or γ-mercaptopropyltrimethoxysilane.
3. The method for preparing a modified graphene aerogel composite insulation board according to claim 1, characterized in that: The nonionic surfactant is selected from a mixture of one or more of polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, and alkylphenol polyoxyethylene ether.
4. The method for preparing a modified graphene aerogel composite insulation board according to claim 1 or 3, characterized in that: The mass ratio of the nonionic surfactant to ethylene glycol is 1-2:14-16.
5. The method for preparing a modified graphene aerogel composite insulation board according to claim 1 or 2, characterized in that: The mass ratio of the silica aerogel to the surface modifier and ethylene glycol is 3-8:10:70-80.
6. The method for preparing a modified graphene aerogel composite insulation board according to claim 1, characterized in that: The drying setting temperature is 60-80° C., and the drying time is 24-48 hours.
7. The method for preparing a modified graphene aerogel composite insulation board according to claim 1, characterized in that: The thickness of the rock wool insulation board is 40-50mm and the density is 120-140kg / m 3 .
8. A modified silica aerogel composite insulation board prepared by the preparation method according to any one of claims 1 to 7.