Thermal-insulation flame-retardant perforated brick composite wall and preparation process thereof

Abstract

The invention relates to a thermal-insulation flame-retardant perforated brick composite wall and a preparation process thereof, and belongs to the technical field of composite walls. Dust on the surfaces of the wall bricks is removed through air flow purging, the cleanliness of the porous bricks is guaranteed, and the bonding strength of follow-up masonry is improved; watering is conducted in advance to wet the porous bricks, standing is conducted for standby application, the step facilitates better absorption of water in mortar in the building process of the porous bricks, and the building quality is improved; concrete is used as a foundation base, so that the overall stability of the wall body is enhanced; the porous bricks are subjected to upper and lower layer staggered joint masonry and hole-aligned masonry at the vertical joint bars, so that the shear resistance and the overall rigidity of the wall body are improved by the masonry mode, and seismic resistance is facilitated; the perforated bricks have good thermal insulation performance, so that the heat conductivity coefficient of the wall body can be effectively reduced, and a good thermal insulation effect is achieved; and the thermal insulation filling material is added, so that the thermal insulation performance of the wall body is further improved, the flame retardant property is also improved, and the safety of a building is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of composite walls and relates to a preparation process of a thermal insulation and flame retardant porous brick composite wall. Background Art

[0002] In the construction industry, with the increasing awareness of energy conservation and environmental protection, higher requirements are placed on the thermal insulation and flame retardant properties of wall materials. Traditional wall materials, such as ordinary clay bricks and concrete bricks, have good mechanical properties, but are obviously insufficient in thermal insulation and flame retardancy. In order to improve the thermal insulation performance of the wall, the method of filling the wall with thermal insulation materials is usually adopted, but this method often leads to complex wall structures, difficult construction, and the stability and durability of the thermal insulation materials are difficult to guarantee.

[0003] In recent years, porous bricks have attracted widespread attention due to their good thermal insulation performance and light weight. However, a single porous brick wall still has certain limitations in terms of thermal insulation and flame retardancy. In order to improve the thermal insulation and flame retardancy of porous brick walls, researchers began to explore the use of multiple materials in combination to form a composite wall with excellent comprehensive performance.

[0004] In the preparation process of composite walls, the performance of thermal insulation filling materials has an important influence on the overall performance of the wall. Traditional thermal insulation filling materials, such as polystyrene boards and rock wool boards, have good thermal insulation performance, but poor flame retardant performance, and are prone to aging and falling off during long-term use. Therefore, it is particularly important to develop a thermal insulation filling material that has both good thermal insulation performance and good flame retardant performance.

[0005] In addition, the preparation process of composite walls also has an important impact on the performance of the wall. Traditional masonry techniques often have problems such as low construction efficiency and unstable wall structure. Therefore, optimizing the preparation process of composite walls and improving construction efficiency and wall structure stability are also issues that need to be urgently addressed in the current construction industry.

[0006] The present invention aims to provide a thermal insulation and flame retardant porous brick composite wall and its preparation process, so as to solve the deficiencies of traditional wall materials in thermal insulation and flame retardancy, improve the comprehensive performance of the wall, and meet the requirements of modern buildings in energy saving, environmental protection, safety, etc. Summary of the invention

[0007] The purpose of the present invention is to provide a preparation process of a thermal insulation and flame retardant porous brick composite wall, which has the characteristics of good thermal insulation and flame retardant effects.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A thermal insulation flame retardant porous brick composite wall, the composite wall comprising wall bricks, grouting material, masonry mortar, concrete, steel bars and thermal insulation filling materials,

[0010] Wherein, the preparation method of the thermal insulation filling material is as follows:

[0011] S1.1: carbon nanotubes and nano-calcium oxide were mixed in a mass ratio of 2:1, and ground in a ball mill at a speed of 500 r / min for 1 h to obtain a mixture A;

[0012] S1.2: dissolving rare earth nitrate in deionized water to obtain a rare earth nitrate solution with a concentration of 1 to 2 M, immersing mixture A in the rare earth nitrate solution with a solid-liquid mass ratio of 1:(1 to 2) g / ml, ultrasonicating for 2 to 3 hours, filtering, and obtaining mixture B;

[0013] S1.3: Dry the mixture B at 80°C for 12 h, transfer it to 400°C for calcination for 2-3 h, slowly cool it to room temperature, and then grind it to obtain a mixture C;

[0014] S1.4: Heat the polyurethane to 170-190°C and stir at a speed of 300 r / min to make it molten, add 10-15 wt% of mixture C, continue stirring for 4 hours, slowly cool to 130°C, add 3-5 wt% asphalt, increase the speed to 1500 r / min, stir for 1-2 hours, and obtain mixture D;

[0015] S1.5: Extruding the mixture D through a mold, cooling and molding, and obtaining the thermal insulation filling material.

[0016] Furthermore, the wall bricks are sintered sludge porous bricks.

[0017] Furthermore, the grouting material preparation method is as follows:

[0018] Mix silicate cement and microsilica powder in a mass ratio of 10:1, stir in a mixing mixer at a speed of 800 r / min for 2 hours, then add 15wt% of quartz sand and 5wt% of calcium chloride, and after mixing evenly, increase the speed to 1000r / min, then add 5wt% of sodium alginate, 3wt% of 3-mercaptopropyltrimethoxysilane and 10wt% of deionized water, and stir for 6 hours to obtain the grouting material.

[0019] Furthermore, the masonry mortar is a mixture of silicate cement, high-strength river sand and deionized water, and the mass ratio of the three is 1:3:0.5.

[0020] Furthermore, the rare earth nitrate in S1.2 is one of cerium nitrate and lanthanum nitrate.

[0021] Furthermore, the rate of slowly cooling to room temperature in S1.3 is 2°C / min.

[0022] Furthermore, the particle size of the mixture C obtained by crushing and grinding in S1.3 is 500 mesh.

[0023] A preparation process of a thermal insulation flame retardant porous brick composite wall, the specific steps of the composite wall preparation process are as follows:

[0024] S8.1: Use airflow to remove dust from the surface of the wall tiles, water them 24 to 48 hours in advance, and let them stand for use to obtain pre-treated porous bricks;

[0025] S8.2: With concrete as the foundation, the porous bricks are laid with staggered joints on the upper and lower skins, and the holes are laid at the vertical reinforcement. During the laying, the length of the mortar for the horizontal joints shall not exceed 750mm, and the vertical joints shall be fully squeezed;

[0026] S8.3: During masonry, horizontal tie bars are arranged every 450 mm, the horizontal tie bars and the vertical dowel bars are welded firmly, grouting material is used for hole filling to obtain a masonry wall, and thermal insulation filling material is inserted between two masonry walls to obtain the composite wall.

[0027] Furthermore, the width of the horizontal mortar joints and the vertical mortar joints in S8.2 is 10 mm.

[0028] Furthermore, the horizontal tie bars in S8.3 should extend 100 to 150 mm beyond the wall.

[0029] Polyurethane is a closed foam material with high thermal insulation performance. Its thermal conductivity is low, which can effectively prevent heat transfer. At the same time, polyurethane also has good adhesion and plasticity, which is easy to process and shape. The present invention uses polyurethane as the base material to provide adhesion and certain thermal insulation performance; carbon nanotubes are used as the main thermal insulation and reinforcement materials. Carbon nanotubes have very high specific surface area and thermal conductivity, which can effectively resist heat transfer. It can achieve thermal insulation and heat resistance by absorbing, reflecting and scattering thermal radiation. At the same time, carbon nanotubes also have high strength and toughness, which can enhance the overall mechanical properties of the filling material; nano calcium oxide has high activity and can react chemically with rare earth nitrates to generate substances with thermal insulation performance. At the same time, it also has a certain thermal insulation effect; the rare earth elements in rare earth nitrates have special electronic structures and optical properties, which can form a localized surface plasma resonance effect, thereby enhancing the thermal insulation performance of the material. At the same time, rare earth elements can also improve the flame retardant performance of the material; asphalt is an asphalt material with a certain thermal insulation effect. More importantly, it can form a carbonized layer at high temperature, thereby preventing the spread of flames and improving the flame retardant performance of the material. At the same time, asphalt can also enhance the weather resistance and durability of the material.

[0030] The synergistic effect of carbon nanotubes, nano calcium oxide and rare earth nitrates forms an efficient thermal insulation layer, which effectively blocks the transfer of heat. Polyurethane, as a matrix material, provides good adhesion and certain thermal insulation performance, further enhancing the overall thermal insulation effect. Carbon nanotubes, with their excellent thermal conductivity, can build an efficient heat conduction network in the material. This helps to reduce heat loss, thereby improving the thermal insulation performance of the material. At the same time, the high strength and toughness of carbon nanotubes can significantly enhance the mechanical properties of the material, making the thermal insulation layer more durable. Nano calcium oxide has a high heat capacity and can store a large amount of heat energy, thereby playing a role in stabilizing the temperature when the temperature fluctuates. In addition, nano calcium oxide may exhibit catalytic properties under certain conditions, promote chemical reactions inside the material, and help form a more compact thermal insulation structure. The introduction of rare earth nitrates can modify the surface of carbon nanotubes and nano calcium oxide, and improve their dispersion and compatibility in the polyurethane matrix. This helps to improve the uniformity and density of the thermal insulation layer. Rare earth elements may also promote the formation of a carbonized layer through catalysis. The carbonized layer, as an effective thermal barrier, can further improve the thermal insulation performance of the material. During the preparation process, carbon nanotubes, nano-calcium oxide and rare earth nitrates are fully contacted and interact with each other through mixing, grinding, ultrasound and other steps. These interactions not only enhance the internal bonding force of the material, but also promote the improvement of thermal insulation performance. When polyurethane is used as the matrix material, it can closely combine these three components to form an insulation layer with excellent overall performance. The viscosity and fluidity of polyurethane also help to maintain the uniformity and density of the material during the extrusion molding process.

[0031] Therefore, carbon nanotubes, nano calcium oxide and rare earth nitrates work synergistically to form an efficient, strong and uniform insulation layer in the insulation filling material. This insulation layer not only has excellent insulation performance, but also has good mechanical properties and stability, which can meet various insulation requirements.

[0032] The rare earth elements in rare earth nitrates and asphalt work together to improve the flame retardant properties of the material. Rare earth elements can catalyze the formation of a carbonized layer, thereby preventing the spread of flames; asphalt forms a carbonized layer at high temperatures, further enhancing the flame retardant effect. First, rare earth elements can catalyze the formation of a denser carbonized layer during combustion. This carbonized layer acts as a protective layer that can effectively isolate heat and oxygen, thereby slowing down or preventing further combustion of the material. This effect of rare earth elements is mainly due to their unique electronic structure and catalytic properties, which can promote the carbonization reaction at high temperatures. Secondly, asphalt can also form a carbonized layer at high temperatures, and this carbonized layer often has a certain degree of viscosity and stability. When asphalt and rare earth elements work together, the carbonized layer formed by the two may produce a synergistic effect in structure and performance, making the carbonized layer denser and more stable, thereby more effectively isolating heat and oxygen; in addition, asphalt also promotes the dispersion and stability of rare earth elements in the material. When rare earth elements are evenly dispersed in the material, their catalytic effect is better. The presence of asphalt may help to evenly disperse rare earth elements in the polyurethane matrix, thereby further improving the flame retardant properties of the material.

[0033] Portland cement is the main cementitious material of grouting material, providing basic strength. Microsilica fume, as an ultrafine filler, can fill the gaps between cement particles and increase the density of grouting material. At the same time, microsilica fume plays a role of crystal nucleus in the early hydration process, accelerates the hydration and hardening of cement, and improves the early and late strength of grouting material; quartz sand, as an aggregate, enhances the volume stability and bearing capacity of grouting material, and forms a dense structure together with Portland cement and microsilica fume; calcium chloride can accelerate the hardening process of cement, react with calcium hydroxide in cement to form calcium chloride and hydroxide, these reaction products can fill the pores and cracks in the grouting body, and further improve the density and strength of the grouting material; sodium alginate, as a natural polysaccharide, has thickening, stabilizing and emulsifying effects. In grouting material, it can increase the viscosity of the slurry, improve its fluidity and stability, and help to form a uniform and dense structure. In addition, the molecular structure of sodium alginate contains a large number of hydroxyl groups, which can undergo cross-linking reactions with metal salts such as calcium chloride, further enhancing the cohesion and strength of the grouting material; 3-mercaptopropyltrimethoxysilane is a reactive and cross-linkable bifunctional silane coupling agent, whose mercaptopropyl functional group can react with unsaturated lipids and polyesters, while the trimethoxy functional group hydrolyzes to generate silanols that can react with inorganic substances. In the grouting material, it can serve as a bridge to firmly bond the organic polymer sodium alginate with the inorganic filler silicate cement and quartz sand, thereby improving the overall performance and durability of the grouting material. Compared with ordinary silane coupling agents, 3-mercaptopropyltrimethoxysilane has a faster hydrolysis rate and can provide a faster reaction and curing speed, which helps to shorten the curing time of the grouting material and improve construction efficiency. In addition, 3-mercaptopropyltrimethoxysilane has a mercapto functional group and has special effects as a metal surface rust inhibitor. It can improve the corrosion resistance and oxidation resistance of metals and improve their bonding properties to polymer materials. This characteristic enables the grouting material to play a certain protective role on the steel bars during the hole filling process, thereby improving the performance of the resulting wall panels.

[0034] The present invention uses air flow to sweep away dust on the surface of wall tiles, thereby ensuring the cleanliness of the porous bricks and being beneficial to the bonding strength of subsequent masonry; the porous bricks are moistened with water in advance and left to stand for use, and this step helps the porous bricks to better absorb moisture in the mortar during the masonry process and improve the masonry quality; concrete is used as the base, thereby enhancing the overall stability of the wall; the porous bricks are laid with staggered seams on the upper and lower skins, and the holes are laid at the vertical reinforcing bars, and this laying method improves the shear resistance and overall rigidity of the wall and is beneficial to earthquake resistance; the porous bricks themselves have good thermal insulation performance, can effectively reduce the thermal conductivity of the wall, and achieve a good thermal insulation effect; the addition of thermal insulation filling materials further improves the thermal insulation performance of the wall, and at the same time the flame retardant performance is also improved, thereby enhancing the safety of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0036] Figure 1 Masonry wall diagram. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0038] Example 1

[0039] The composite wall comprises sintered silt porous bricks, grouting materials, masonry mortar, concrete, steel bars and thermal insulation filling materials.

[0040] Wherein, the preparation method of the thermal insulation filling material is as follows:

[0041] S1.1: carbon nanotubes and nano-calcium oxide were mixed in a mass ratio of 2:1, and ground in a ball mill at a speed of 500 r / min for 1 h to obtain a mixture A;

[0042] S1.2: dissolving cerium nitrate in deionized water to obtain a 2M cerium nitrate solution, immersing mixture A in a rare earth nitrate solution with a solid-liquid mass ratio of 1:1 g / ml, ultrasonicating for 3 h, filtering, and obtaining mixture B;

[0043] S1.3: Dry the mixture B at 80°C for 12 h, transfer it to 400°C for calcination for 2 h, slowly cool it to room temperature at a rate of 2°C / min, and then grind it to obtain a mixture C with a particle size of 500 mesh;

[0044] S1.4: Heat the polyurethane to 170°C and stir at a speed of 300 r / min to make it molten, add 15 wt% of mixture C, continue stirring for 4 hours, slowly cool to 130°C, add 5 wt% asphalt, increase the speed to 1500 r / min, stir for 2 hours, and obtain mixture D;

[0045] S1.5: Extruding the mixture D through a mold, cooling and molding, and obtaining the thermal insulation filling material.

[0046] The grouting material preparation method is as follows:

[0047] Mix silicate cement and microsilica powder in a mass ratio of 10:1, stir in a mixing mixer at a speed of 800 r / min for 2 hours, then add 15wt% of quartz sand and 5wt% of calcium chloride, and after mixing evenly, increase the speed to 1000r / min, then add 5wt% of sodium alginate, 3wt% of 3-mercaptopropyltrimethoxysilane and 10wt% of deionized water, and stir for 6 hours to obtain the grouting material.

[0048] The masonry mortar is a mixture of silicate cement, high-strength river sand and deionized water, and the mass ratio of the three is 1:3:0.5.

[0049] The specific steps of the composite wall preparation process are as follows:

[0050] S8.1: Use airflow to blow away dust on the surface of the wall tiles, water them 48 hours in advance, and let them stand for use to obtain pre-treated porous bricks;

[0051] S8.2: With concrete as the foundation, the porous bricks are laid with staggered joints on the upper and lower skins, and the holes are laid at the vertical reinforcement. During the laying, the mortar laying length of the horizontal mortar joints shall not exceed 750mm, and the vertical mortar joints shall be full batch extrusion method. The width of the horizontal and vertical mortar joints shall be 10mm;

[0052] S8.3: During masonry, horizontal tie bars are arranged every 450 mm, and the horizontal tie bars should protrude from the wall by 100 to 150 mm. The horizontal tie bars and the vertical dowel bars are welded firmly, and grouting material is used to perform hole filling treatment to obtain a masonry wall. A thermal insulation filling material is inserted between two masonry walls to obtain the composite wall.

[0053] Example 2

[0054] The composite wall comprises sintered silt porous bricks, grouting materials, masonry mortar, concrete, steel bars and thermal insulation filling materials.

[0055] Wherein, the preparation method of the thermal insulation filling material is as follows:

[0056] S1.1: carbon nanotubes and nano-calcium oxide were mixed in a mass ratio of 2:1, and ground in a ball mill at a speed of 500 r / min for 1 h to obtain a mixture A;

[0057] S1.2: Dissolve lanthanum nitrate in deionized water to obtain a 1M lanthanum nitrate solution, immerse mixture A in a rare earth nitrate solution with a solid-liquid mass ratio of 1:2 g / ml, sonicate for 3 h, and filter to obtain mixture B;

[0058] S1.3: Dry the mixture B at 80°C for 12 h, transfer it to 400°C for calcination for 3 h, slowly cool it to room temperature at a rate of 2°C / min, and then grind it to obtain a mixture C with a particle size of 500 mesh;

[0059] S1.4: Heat the polyurethane to 190°C and stir at a speed of 300 r / min to make it molten, add 15 wt% of mixture C, continue stirring for 4 hours, slowly cool to 130°C, add 5 wt% asphalt, increase the speed to 1500 r / min, stir for 2 hours, and obtain mixture D;

[0060] S1.5: Extruding the mixture D through a mold, cooling and molding, and obtaining the thermal insulation filling material.

[0061] The grouting material preparation method is as follows:

[0062] Mix silicate cement and microsilica powder in a mass ratio of 10:1, stir in a mixing mixer at a speed of 800 r / min for 2 hours, then add 15wt% of quartz sand and 5wt% of calcium chloride, and after mixing evenly, increase the speed to 1000r / min, then add 5wt% of sodium alginate, 3wt% of 3-mercaptopropyltrimethoxysilane and 10wt% of deionized water, and stir for 6 hours to obtain the grouting material.

[0063] The masonry mortar is a mixture of silicate cement, high-strength river sand and deionized water, and the mass ratio of the three is 1:3:0.5.

[0064] The specific steps of the composite wall preparation process are as follows:

[0065] S8.1: Use airflow to blow away dust on the surface of the wall tiles, water them 24 hours in advance, and let them stand for use to obtain pre-treated porous bricks;

[0066] S8.2: With concrete as the foundation, the porous bricks are laid with staggered joints on the upper and lower skins, and the holes are laid at the vertical reinforcement. During the laying, the mortar laying length of the horizontal mortar joints shall not exceed 750mm, and the vertical mortar joints shall be full batch extrusion method. The width of the horizontal and vertical mortar joints shall be 10mm;

[0067] S8.3: During masonry, horizontal tie bars are arranged every 450 mm, and the horizontal tie bars should protrude from the wall by 100 to 150 mm. The horizontal tie bars and the vertical dowel bars are welded firmly, and grouting material is used to perform hole filling treatment to obtain a masonry wall. A thermal insulation filling material is inserted between two masonry walls to obtain the composite wall.

[0068] Example 3

[0069] The composite wall comprises sintered silt porous bricks, grouting materials, masonry mortar, concrete, steel bars and thermal insulation filling materials.

[0070] Wherein, the preparation method of the thermal insulation filling material is as follows:

[0071] S1.1: carbon nanotubes and nano-calcium oxide were mixed in a mass ratio of 2:1, and ground in a ball mill at a speed of 500 r / min for 1 h to obtain a mixture A;

[0072] S1.2: dissolving cerium nitrate in deionized water to obtain a 2M cerium nitrate solution, immersing mixture A in a rare earth nitrate solution at a solid-liquid mass ratio of 1:1 g / ml, ultrasonicating for 2 h, filtering, and obtaining mixture B;

[0073] S1.3: Dry the mixture B at 80°C for 12 h, transfer it to 400°C for calcination for 2 h, slowly cool it to room temperature at a rate of 2°C / min, and then grind it to obtain a mixture C with a particle size of 500 mesh;

[0074] S1.4: Heat the polyurethane to 170°C and stir at a speed of 300 r / min to make it molten, add 10 wt% of mixture C, continue stirring for 4 hours, slowly cool to 130°C, add 3 wt% asphalt, increase the speed to 1500 r / min, stir for 1 hour, and obtain mixture D;

[0075] S1.5: Extruding the mixture D through a mold, cooling and molding, and obtaining the thermal insulation filling material.

[0076] The grouting material preparation method is as follows:

[0077] Mix silicate cement and microsilica powder in a mass ratio of 10:1, stir in a mixing mixer at a speed of 800 r / min for 2 hours, then add 15wt% of quartz sand and 5wt% of calcium chloride, and after mixing evenly, increase the speed to 1000r / min, then add 5wt% of sodium alginate, 3wt% of 3-mercaptopropyltrimethoxysilane and 10wt% of deionized water, and stir for 6 hours to obtain the grouting material.

[0078] The masonry mortar is a mixture of silicate cement, high-strength river sand and deionized water, and the mass ratio of the three is 1:3:0.5.

[0079] The specific steps of the composite wall preparation process are as follows:

[0080] S8.1: Use airflow to blow away dust on the surface of the wall tiles, water them 48 hours in advance, and let them stand for use to obtain pre-treated porous bricks;

[0081] S8.2: With concrete as the foundation, the porous bricks are laid with staggered joints on the upper and lower skins, and the holes are laid at the vertical reinforcement. During the laying, the mortar laying length of the horizontal mortar joints shall not exceed 750mm, and the vertical mortar joints shall be full batch extrusion method. The width of the horizontal and vertical mortar joints shall be 10mm;

[0082] S8.3: During masonry, horizontal tie bars are arranged every 450 mm, and the horizontal tie bars should protrude from the wall by 100 to 150 mm. The horizontal tie bars and the vertical dowel bars are welded firmly, and grouting material is used to perform hole filling treatment to obtain a masonry wall. A thermal insulation filling material is inserted between two masonry walls to obtain the composite wall.

[0083] Comparative Example 1

[0084] In this comparative example, the polyurethane was not modified, and the remaining steps were consistent with those in Example 1.

[0085] Comparative Example 2

[0086] In this comparative example, no carbon nanotubes were added during the polyurethane modification process, and the remaining steps were consistent with those in Example 1.

[0087] Comparative Example 3

[0088] In this comparative example, no nano calcium oxide was added during the polyurethane modification process, and the remaining steps were consistent with those in Example 1.

[0089] Comparative Example 4

[0090] In this comparative example, no rare earth nitrate is added during the polyurethane modification process, and the remaining steps are consistent with Example 1.

[0091] Comparative Example 5

[0092] In this comparative example, no calcination treatment is performed during the polyurethane modification process, and the remaining steps are consistent with those of Example 1.

[0093] Comparative Example 6

[0094] In this comparative example, no asphalt was added during the polyurethane modification process, and the remaining steps were consistent with those in Example 1.

[0095] Comparative Example 7

[0096] In this comparative example, 3-mercaptopropyltrimethoxysilane was not added during the preparation of the grouting material, and the remaining steps were consistent with those of Example 1.

[0097] The thermal insulation and flame retardant properties of the embodiments and comparative examples were tested with reference to standards Q / 310116MZJN 006 and GB / T32981-2016. The experimental results are summarized in the following table:

[0098]

[0099] It can be seen from the above experimental data that modifying the polyurethane and adding 3-mercaptopropyltrimethoxysilane to the grouting material can effectively improve the thermal insulation and flame retardant properties of the composite wall of the present invention.

[0100] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief 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 thermal insulation flame retardant porous brick composite wall, characterized in that: The composite wall comprises wall bricks, grouting materials, masonry mortar, concrete, steel bars and thermal insulation filling materials. Wherein, the preparation method of the thermal insulation filling material is as follows: S1.1: carbon nanotubes and nano-calcium oxide were mixed in a mass ratio of 2:1, and ground in a ball mill at a speed of 500 r / min for 1 h to obtain a mixture A; S1.2: dissolving rare earth nitrate in deionized water to obtain a rare earth nitrate solution with a concentration of 1 to 2 M, immersing mixture A in the rare earth nitrate solution with a solid-liquid mass ratio of 1:(1 to 2) g / ml, ultrasonicating for 2 to 3 hours, filtering, and obtaining mixture B; S1.3: Dry the mixture B at 80°C for 12 h, transfer it to 400°C for calcination for 2-3 h, slowly cool it to room temperature, and then grind it to obtain a mixture C; S1.4: Heat the polyurethane to 170-190°C and stir at a speed of 300 r / min to make it molten, add 10-15 wt% of mixture C, continue stirring for 4 hours, slowly cool to 130°C, add 3-5 wt% asphalt, increase the speed to 1500 r / min, stir for 1-2 hours, and obtain mixture D; S1.5: Extruding the mixture D through a mold, cooling and molding, and obtaining the thermal insulation filling material.

2. The thermal insulation and flame retardant porous brick composite wall according to claim 1, characterized in that: The wall bricks are sintered sludge porous bricks.

3. The thermal insulation and flame retardant porous brick composite wall according to claim 1, characterized in that: The grouting material preparation method is as follows: Mix silicate cement and microsilica powder in a mass ratio of 10:1, stir in a mixing mixer at a speed of 800 r / min for 2 hours, then add 15wt% of quartz sand and 5wt% of calcium chloride, and after mixing evenly, increase the speed to 1000r / min, then add 5wt% of sodium alginate, 3wt% of 3-mercaptopropyltrimethoxysilane and 10wt% of deionized water, and stir for 6 hours to obtain the grouting material.

4. The thermal insulation and flame retardant porous brick composite wall according to claim 1, characterized in that: The masonry mortar is a mixture of silicate cement, high-strength river sand and deionized water, and the mass ratio of the three is 1:3:0.

5.

5. The thermal insulation and flame retardant porous brick composite wall according to claim 1, characterized in that: The rare earth nitrate in S1.2 is one of cerium nitrate and lanthanum nitrate.

6. The thermal insulation and flame retardant porous brick composite wall according to claim 1, characterized in that: The rate of slowly cooling to room temperature in S1.3 is 2°C / min.

7. The thermal insulation and flame retardant porous brick composite wall according to claim 1, characterized in that: The particle size of the mixture C obtained by crushing and grinding in S1.3 is 500 mesh.

8. A preparation process of a thermal insulation flame retardant porous brick composite wall, based on the thermal insulation flame retardant porous brick composite wall according to any one of claims 1 to 7, characterized in that: The specific steps of the composite wall preparation process are as follows: S8.1: Use airflow to remove dust from the surface of the wall tiles, water them 24 to 48 hours in advance, and let them stand for use to obtain pre-treated porous bricks; S8.2: With concrete as the foundation, the porous bricks are laid with staggered joints on the upper and lower skins, and the holes are laid at the vertical reinforcement. During the laying, the length of the mortar for the horizontal joints shall not exceed 750mm, and the vertical joints shall be fully squeezed; S8.3: During masonry, horizontal tie bars are arranged every 450 mm, the horizontal tie bars and the vertical dowel bars are welded firmly, grouting material is used for hole filling to obtain a masonry wall, and thermal insulation filling material is inserted between two masonry walls to obtain the composite wall.

9. The process for preparing a thermal insulation and flame retardant porous brick composite wall according to claim 8, characterized in that: The width of the horizontal and vertical mortar joints in S8.2 is 10 mm.

10. The process for preparing a thermal insulation and flame retardant porous brick composite wall according to claim 8, characterized in that: The horizontal tie bars in S8.3 should extend 100 to 150 mm beyond the wall.

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