Base layer reinforcing agent for silicon graphene external wall panel and construction process of base layer reinforcing agent
By combining lanthanum nitrate and cerium nitrate-modified kaolin and silica, the problems of base adhesion, durability and construction efficiency of silicon graphene exterior wall panels were solved, the mechanical strength and thermal stability were improved, and efficient construction and self-cleaning effects were achieved.
Patent Information
- Application Number
- CN202510951691.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-09-26
AI Technical Summary
In actual applications, silicon-graphene exterior wall panels have problems such as insufficient base adhesion, poor durability, low construction efficiency and insufficient crack resistance, which affect their service life and safety.
Lanthanum nitrate and cerium nitrate are used to synergistically modify kaolin, combined with a combination of silica and acrylate emulsion, and the performance of the base reinforcement agent is improved through a specific construction process, including the preparation of modified kaolin, calcination treatment, and preparation and coating of the base reinforcement agent.
The mechanical strength, wear resistance, thermal stability and construction efficiency of silicon graphene exterior wall panels have been significantly improved, the service life has been extended, and they have self-cleaning functions, which reduces the amount of silane coupling agent used.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of wallboard processing and relates to a base reinforcement agent for silicon graphene exterior wallboard and a construction process thereof. Background Art
[0002] As a new type of composite insulation material, silicon graphene exterior wall panels have been widely used in integrated building exterior wall insulation systems due to their advantages such as Class A non-combustibility, high toughness and low water absorption. However, the following problems still exist in actual applications. First, the adhesion of the base layer is insufficient. The bonding strength between the silicon graphene board and the concrete base layer is limited by the interface treatment process. It is easy to cause hollowing and falling off due to poor base layer flatness, dust or oil residue. Secondly, there are durability defects. Traditional interface agents cannot effectively block water penetration. After long-term use, the silicon graphene board is prone to water absorption and expansion, freeze-thaw damage, and shortening its service life. In addition, the construction efficiency is low. The existing process requires multiple layers of plastering and leveling, and it is necessary to wait for the base layer to dry, which takes a long time and has high labor costs. Finally, the crack resistance is insufficient. The thermal expansion coefficient of the silicon graphene board and the concrete is very different. Cracks are easily generated at the joints due to temperature stress, affecting the insulation effect and safety. Summary of the Invention
[0003] The object of the present invention is to provide a base reinforcement agent for silicon graphene exterior wall panels and a construction process thereof.
[0004] The purpose of the present invention can be achieved through the following technical solutions: A base reinforcement for silicon graphene exterior wall panels, the base reinforcement having the following formula: in parts by weight: 70-80 parts of acrylic emulsion, 5-10 parts of modified kaolin, 3-5 parts of silicon dioxide, 1-2 parts of wetting agent, and 0.7-0.8 parts of silane coupling agent. The preparation method of the modified kaolin is as follows: S1-1: 10-20 parts by weight of kaolin were added to 100 parts by weight of deionized water, and ultrasonically dispersed for 30 minutes. Subsequently, 0.5-2 parts by weight of a mixture of lanthanum nitrate and cerium nitrate were added, and ultrasonic stirring was performed at 55-65°C for 2-3 hours. The mixture was then washed with deionized water and vacuum dried at 100°C for 12-16 hours to obtain powder A. S1-2: Powder A was added to a muffle furnace and calcined for 1 to 2 hours in a high-purity nitrogen atmosphere. After naturally cooling to room temperature, the powder was ball-milled for 1.5 to 2.5 hours to obtain the modified kaolin.
[0005] As a preferred technical solution of the present invention, the molar ratio of lanthanum nitrate to cerium nitrate in S1-1 is 1:(0.3~0.5).
[0006] As a preferred technical solution of the present invention, the stirring speed in S1-1 is 500~600 rpm.
[0007] As a preferred technical solution of the present invention, the calcination temperature of the muffle furnace in S1-2 is 900~1100℃.
[0008] As a preferred technical solution of the present invention, the ball milling speed in S1-2 is 150~200 rpm.
[0009] As a preferred technical solution of the present invention, the wetting agent is a mixture of fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate in a mass ratio of (1-2):1.
[0010] As a preferred technical solution of the present invention, the silane coupling agent is one or more of KH-550, KH-560 and KH-570.
[0011] A preparation process for a base reinforcement agent for silicon graphene exterior wall panels, the specific steps of the preparation process are as follows: According to the formula, silica was added to the acrylic emulsion, stirred at a speed of 1000-1500 rpm for 10-20 minutes, and then ultrasonically dispersed for 5 minutes with an ultrasonic power of 100-200 W. Subsequently, modified kaolin was added and stirred for 20-30 minutes. Then, a wetting agent and a silane coupling agent were added in sequence, the speed was reduced to 300-500 rpm, stirred for 30 minutes, and finally vacuum degassing was performed for 10 minutes to obtain the base reinforcement agent.
[0012] As a preferred technical solution of the present invention, the pressure of the vacuum degassing treatment is 0.08~0.1 MPa A construction process for a base reinforcement agent for silicon graphene exterior wall panels, the specific steps of the construction process are as follows: The surface of the silicon graphene exterior wall panel was polished with 120-grit sandpaper and then wiped with isopropyl alcohol. The base reinforcement agent was applied to the surface of the exterior wall panel using a high-pressure airless sprayer with a pressure of 10-15 MPa, a nozzle diameter of 0.5-0.8 mm, and a base reinforcement agent dosage of 100-120 g / m 2 The construction environment is temperature 5~35℃ and humidity <85%.
[0013] Kaolin has a layered silicate structure and is rich in hydroxyl and siloxane groups on its surface, which provide active sites for chemical modification. Its flaky structure can enhance the barrier properties of composite materials. However, natural kaolin has defects such as poor dispersibility and weak interface bonding with organic matrices. 3+ and Ce 3+Through ion exchange adsorption on the surface and interlayer of kaolin, La-Ce composite layer is formed. The molar ratio of mixed rare earth nitrate can optimize the modification effect. Ce 3+ The introduction of La 3+ The tendency to volatilize at high temperatures increases the solid loading capacity. After modification with rare earth nitrates, the surface potential of kaolin changes, enhancing the electrostatic interaction with the acrylic emulsion and reducing agglomeration. The contact angle of the modified kaolin decreases, and the wettability is improved.
[0014] Calcination under high-purity nitrogen effectively prevents the oxidation of rare earth nitrates to a high-valent state during calcination, maintaining the reduced state of the La-Ce composite oxide and enhancing its activity. It also prevents the structural water generated by kaolin dehydroxylation from reacting with the rare earth oxides, ensuring product purity. Calcination completely dehydroxylates the kaolin to form metakaolinite, while the rare earth nitrates decompose into lanthanum oxide and cerium oxide, forming a solid solution with the metakaolinite. Post-processing with ball milling refines the calcined product particle size, significantly increasing its specific surface area and enhancing interfacial contact with the acrylic emulsion.
[0015] La-Ce synergistic modification significantly improves kaolin's high-temperature resistance and fire resistance, making it suitable for exterior wallboard applications in high-temperature environments. It also effectively prevents yellowing of the wallboard. La-Ce synergistic modification also significantly enhances the mechanical properties of the kaolin. The La-Ce composite oxide forms chemical bonds with the acrylate, effectively increasing the tensile strength of the modified kaolin. Rare earth modification provides partial interfacial bonding, effectively reducing the amount of silane coupling agent in the formulation. The crack-resistance effect of the kaolin's flaky structure and the reinforcing effect of the rare earth oxides effectively improve the mechanical strength of the wallboard. This also enhances weather resistance and expands functionality. Furthermore, the rare earth oxides exhibit a photocatalytic effect, effectively decomposing organic contaminants.
[0016] The addition of silica and modified kaolin creates a synergistic effect. Modified kaolin has a flaky structure, while silica has a spherical or network-like structure. The combination of the two forms a three-dimensional reinforced network of flakes and particles, significantly improving the material's impact resistance and wear resistance. At the same time, the synergy between the two significantly enhances the Shore hardness and wear resistance of the exterior wall panels. Furthermore, the modified kaolin's layered structure blocks heat conduction, while silica's low thermal expansion coefficient reduces thermal stress. The synergy between the two increases the material's thermal deformation temperature, effectively enhancing the exterior wall panels' high-temperature resistance. The thixotropic effect of silica optimizes the system's rheological properties, improving construction leveling and anti-sagging properties.
[0017] Beneficial effects of the present invention: (1) The present invention significantly improves the comprehensive performance of kaolin through the synergistic modification and calcination process of lanthanum nitrate and cerium nitrate. First, rare earth ions are adsorbed on the surface and interlayer of kaolin through ion exchange to form a La-Ce composite layer, which optimizes the surface potential and wettability of kaolin, enhances its electrostatic interaction with acrylic emulsion, significantly improves its dispersibility, and greatly reduces agglomeration. At the same time, kaolin is dehydroxylated to form metakaolinite, which forms a solid solution with rare earth oxides, giving the material excellent high-temperature resistance and mechanical strength. In addition, the flaky structure of the modified kaolin and the reinforcing effect of the rare earth oxides synergistically improve the impact resistance, wear resistance and thermal stability of the exterior wall panels, and reduce the amount of silane coupling agent used. Finally, the photocatalytic effect of the rare earth oxides gives the material a self-cleaning function, which can efficiently decompose organic dirt and extend the service life of the exterior wall panels.
[0018] (2) The silica in the present invention has a multi-dimensional synergistic effect with the modified kaolin, acrylic emulsion and other components, which significantly improves the comprehensive performance of the base reinforcement agent. First, the nano effect of silica and the flaky structure of modified kaolin form a three-dimensional reinforced network of flakes and particles, which significantly enhances the hardness, impact resistance and wear resistance of the exterior wall panels. Second, the low thermal expansion coefficient of silica and the barrier properties of modified kaolin work together to increase the thermal deformation temperature of the material, thereby making the exterior wall panels have good high temperature resistance. In addition, the thixotropic effect of silica optimizes the rheological properties of the system and improves the leveling and anti-sagging properties during construction. DETAILED DESCRIPTION
[0019] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.
[0020] Example 1 A base reinforcement for silicon graphene exterior wall panels, wherein the base reinforcement has a formula 1 as follows: in parts by weight, 75 parts of acrylic emulsion, 8 parts of modified kaolin, 4 parts of silicon dioxide, 1.5 parts of wetting agent, and 0.75 parts of silane coupling agent KH-550. The wetting agent is a mixture of fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate in a mass ratio of 1.5:1. The preparation method of the modified kaolin is as follows: S1-1: 15 parts by weight of kaolin were added to 100 parts by weight of deionized water, and the mixture was ultrasonically dispersed for 30 min. Then, 1 part by weight of a mixture of lanthanum nitrate and cerium nitrate was added, wherein the molar ratio of lanthanum nitrate to cerium nitrate was 1:0.4. The mixture was ultrasonically stirred at 60°C for 2.5 h at a stirring speed of 550 rpm. The mixture was then washed with deionized water and dried in vacuo at 100°C for 14 h to obtain powder A. S1-2: Powder A was added to a muffle furnace and calcined for 1.5 h at a calcination temperature of 1000 ° C in a high-purity nitrogen atmosphere. After naturally cooling to room temperature, the powder was ball-milled for 2 h at a ball-milling speed of 180 rpm to obtain the modified kaolin.
[0021] A preparation process for a base reinforcement agent for silicon graphene exterior wall panels, the specific steps of the preparation process are as follows: According to formula 1, silica was added to the acrylic emulsion, stirred at a speed of 1200 rpm for 15 minutes, and then ultrasonically dispersed for 5 minutes at an ultrasonic power of 150 W. Subsequently, modified kaolin was added and stirred for 25 minutes. Then, a wetting agent and a silane coupling agent KH-550 were added in sequence. The speed was reduced to 400 rpm and stirred for 30 minutes. Finally, vacuum degassing was performed for 10 minutes at a pressure of 0.09 MPa to obtain the base reinforcement agent.
[0022] A construction process for a base reinforcement agent for silicon graphene exterior wall panels, the specific steps of the construction process are as follows: The surface of the silicon graphene exterior wall panel was polished with 120-grit sandpaper and then wiped with isopropyl alcohol. The base reinforcement agent was applied to the surface of the exterior wall panel using a high-pressure airless sprayer with a pressure of 13 MPa, a nozzle diameter of 0.6 mm, and a base reinforcement agent dosage of 110 g / m 2 The construction environment is temperature 25℃ and humidity <85%.
[0023] Example 2 A base reinforcement for silicon graphene exterior wall panels, wherein the base reinforcement has a formula 2 as follows: in parts by weight, 70 parts of acrylic emulsion, 5 parts of modified kaolin, 3 parts of silicon dioxide, 1 part of wetting agent, and 0.7 part of silane coupling agent KH-560. The wetting agent is a mixture of fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate in a mass ratio of 1:1. The preparation method of the modified kaolin is as follows: S1-1: 10 parts by weight of kaolin were added to 100 parts by weight of deionized water, and the mixture was ultrasonically dispersed for 30 min. Subsequently, 0.5 parts by weight of a mixture of lanthanum nitrate and cerium nitrate was added, wherein the molar ratio of lanthanum nitrate to cerium nitrate was 1:0.3. The mixture was ultrasonically stirred at 55°C for 2 h at a stirring speed of 500 rpm. The mixture was then washed with deionized water and dried in vacuo at 100°C for 12 h to obtain powder A. S1-2: Powder A was added to a muffle furnace and calcined for 1 h at a calcination temperature of 900 °C in a high-purity nitrogen atmosphere. After naturally cooling to room temperature, the powder was ball-milled for 1.5 h at a ball-milling speed of 150 rpm to obtain the modified kaolin.
[0024] A preparation process for a base reinforcement agent for silicon graphene exterior wall panels, the specific steps of the preparation process are as follows: According to formula 2, silica was added to the acrylic emulsion, stirred at a speed of 1000 rpm for 10 minutes, and then ultrasonically dispersed for 5 minutes with an ultrasonic power of 100 W. Subsequently, modified kaolin was added and stirred for 20 minutes. Then, a wetting agent and a silane coupling agent KH-560 were added in sequence. The speed was reduced to 300 rpm and stirred for 30 minutes. Finally, vacuum degassing was performed for 10 minutes at a pressure of 0.08 MPa to obtain the base reinforcing agent.
[0025] A construction process for a base reinforcement agent for silicon graphene exterior wall panels, the specific steps of the construction process are as follows: The surface of the silicon graphene exterior wall panel was polished with 120-grit sandpaper and then wiped with isopropyl alcohol. The base reinforcement agent was applied to the surface of the exterior wall panel using a high-pressure airless sprayer with a pressure of 10 MPa, a nozzle diameter of 0.5 mm, and a base reinforcement agent dosage of 100 g / m 2 The construction environment is temperature 25℃ and humidity <85%.
[0026] Example 3 A base reinforcement for silicon graphene exterior wall panels, wherein the base reinforcement has a formula 3 as follows: in parts by weight, 80 parts of acrylic emulsion, 10 parts of modified kaolin, 5 parts of silicon dioxide, 2 parts of wetting agent, and 0.8 parts of silane coupling agent KH-570. The wetting agent is a mixture of fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate in a mass ratio of 2:1 The preparation method of the modified kaolin is as follows: S1-1: 20 parts by weight of kaolin were added to 100 parts by weight of deionized water, and the mixture was ultrasonically dispersed for 30 min. Subsequently, 2 parts by weight of a mixture of lanthanum nitrate and cerium nitrate was added, wherein the molar ratio of lanthanum nitrate to cerium nitrate was 1:0.5. The mixture was ultrasonically stirred at 65°C for 3 h at a stirring speed of 600 rpm. The mixture was then washed with deionized water and vacuum dried at 100°C for 16 h to obtain powder A. S1-2: Powder A was added to a muffle furnace and calcined for 2 h at a calcination temperature of 1100 ° C in a high-purity nitrogen atmosphere. After naturally cooling to room temperature, the powder was ball-milled for 2.5 h at a ball-milling speed of 200 rpm to obtain the modified kaolin.
[0027] A preparation process for a base reinforcement agent for silicon graphene exterior wall panels, the specific steps of the preparation process are as follows: According to formula 3, silica was added to the acrylic emulsion, stirred at a speed of 1500 rpm for 20 minutes, and then ultrasonically dispersed for 5 minutes with an ultrasonic power of 200 W. Subsequently, modified kaolin was added and stirred for 30 minutes. Then, a wetting agent and a silane coupling agent KH-570 were added in sequence. The speed was reduced to 500 rpm and stirred for 30 minutes. Finally, vacuum degassing was performed for 10 minutes at a pressure of 0.1 MPa to obtain the base reinforcement agent.
[0028] A construction process for a base reinforcement agent for silicon graphene exterior wall panels, the specific steps of the construction process are as follows: The surface of the silicon graphene exterior wall panel was polished with 120-grit sandpaper and then wiped with isopropyl alcohol. The base reinforcement agent was applied to the surface of the exterior wall panel using a high-pressure airless sprayer with a pressure of 15 MPa, a nozzle diameter of 0.8 mm, and a base reinforcement agent dosage of 120 g / m 2 The construction environment is temperature 25℃ and humidity <85%.
[0029] Comparative Example 1 Lanthanum nitrate was not added during the preparation of the modified kaolin, and the remaining steps were the same as those in Example 1.
[0030] Comparative Example 2 No cerium nitrate was added during the preparation of the modified kaolin, and the remaining steps were the same as those in Example 1.
[0031] Comparative Example 3 The mixture of lanthanum nitrate and cerium nitrate was not added during the preparation of the modified kaolin, and the remaining steps were the same as those in Example 1.
[0032] Comparative Example 4 The modified kaolin is prepared without muffle furnace calcination, and the remaining steps are the same as those in Example 1.
[0033] Comparative Example 5 Unmodified kaolin was used instead of modified kaolin, and the remaining steps were the same as those in Example 1.
[0034] Comparative Example 6 No silicon dioxide was added during the preparation of the base reinforcement, and the remaining steps were the same as those in Example 1.
[0035] Performance Testing The hardness of the examples and comparative examples was tested using a Shore D durometer according to GB / T 531 standard; the wear resistance of the examples and comparative examples was tested using a Taber abrader according to GB / T 1768 standard. The experimental results are recorded in the following table.
[0036] It can be seen from the data of the examples and comparative examples that the base reinforcement prepared by the present invention can effectively improve the mechanical properties of the exterior wall panels, such as hardness and wear resistance.
[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A base reinforcement for silicon graphene exterior wall panels, characterized in that: The formula of the base reinforcement agent is as follows: in parts by weight, 70-80 parts of acrylic emulsion, 5-10 parts of modified kaolin, 3-5 parts of silicon dioxide, 1-2 parts of wetting agent, and 0.7-0.8 parts of silane coupling agent. The preparation method of the modified kaolin is as follows: S1-1: 10-20 parts by weight of kaolin were added to 100 parts by weight of deionized water, and ultrasonically dispersed for 30 minutes. Subsequently, 0.5-2 parts by weight of a mixture of lanthanum nitrate and cerium nitrate were added, and ultrasonic stirring was performed at 55-65°C for 2-3 hours. The mixture was then washed with deionized water and vacuum dried at 100°C for 12-16 hours to obtain powder A. S1-2: Powder A was added to a muffle furnace and calcined for 1 to 2 hours in a high-purity nitrogen atmosphere. After naturally cooling to room temperature, the powder was ball-milled for 1.5 to 2.5 hours to obtain the modified kaolin.
2. A base reinforcement agent for silicon graphene exterior wall panels according to claim 1, characterized in that: The molar ratio of lanthanum nitrate to cerium nitrate in S1-1 is 1:(0.3~0.5).
3. The base reinforcement agent for silicon graphene exterior wallboard according to claim 1, characterized in that: The stirring speed in the S1-1 is 500-600 rpm.
4. The base reinforcement agent for silicon graphene exterior wallboard according to claim 1, characterized in that: The calcination temperature of the muffle furnace in S1-2 is 900-1100°C.
5. The base reinforcement agent for silicon graphene exterior wallboard according to claim 1, characterized in that: The ball milling speed in S1-2 is 150-200 rpm.
6. The base reinforcement agent for silicon graphene exterior wallboard according to claim 1, characterized in that: The wetting agent is a mixture of fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate in a mass ratio of (1-2):
1.
7. The base reinforcement agent for silicon graphene exterior wallboard according to claim 1, characterized in that: The silane coupling agent is one or more of KH-550, KH-560 and KH-570.
8. A process for preparing a base reinforcement agent for silicon graphene exterior wall panels according to any one of claims 1 to 7, characterized in that: The specific steps of the preparation process are as follows: According to the formula, silica was added to the acrylic emulsion, stirred at a speed of 1000-1500 rpm for 10-20 minutes, and then ultrasonically dispersed for 5 minutes with an ultrasonic power of 100-200 W. Subsequently, modified kaolin was added and stirred for 20-30 minutes. Then, a wetting agent and a silane coupling agent were added in sequence, the speed was reduced to 300-500 rpm, stirred for 30 minutes, and finally vacuum degassing was performed for 10 minutes to obtain the base reinforcement agent.
9. The process for preparing a base reinforcement agent for silicon-graphene exterior wall panels according to claim 8, characterized in that: The pressure of the vacuum degassing treatment is 0.08~0.1 MPa.
10. A construction process for a base reinforcement agent for silicon graphene exterior wall panels according to any one of claims 1 to 7, characterized in that: The specific steps of the construction process are as follows: The surface of the silicon graphene exterior wall panel was polished with 120-grit sandpaper and then wiped with isopropyl alcohol. The base reinforcement agent was applied to the surface of the exterior wall panel using a high-pressure airless sprayer with a pressure of 10-15 MPa, a nozzle diameter of 0.5-0.8 mm, and a base reinforcement agent dosage of 100-120 g / m 2 The construction environment is temperature 5~35℃ and humidity <85%.