Lightweight thermal insulation block convenient for installation on a sloping roof

Abstract

The present application uses low-iron red mud as the main material and fly ash as the secondary material to prepare light heat-insulating blocks. Research shows that when low-iron red mud is used as the main component to prepare light heat-insulating blocks, with the increase of the amount of fly ash, the compressive strength of the product shows a trend of first increasing and then decreasing, and when the amount ratio of low-iron red mud to fly ash is 100:46.5, the compressive strength reaches the highest. At the same time, with the increase of the amount of fly ash, the thermal conductivity of the product gradually decreases, that is, the heat insulation performance of the product is gradually optimized, and the downward trend of the thermal conductivity will gradually slow down. Based on the comprehensive consideration of the compressive strength and the heat insulation performance, the amount ratio of low-iron red mud to fly ash is controlled in 100:(25-65) as appropriate. In addition, the present application makes the light heat-insulating material into a prefabricated block in advance, which is beneficial to the installation on the slope and can adapt to the laying requirements of the roof material.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation materials, and more specifically to a lightweight thermal insulation block that is easy to install on sloping roofs. Background Technology

[0002] In hot climates, solar radiation in summer causes roof temperatures to rise sharply. To reduce heat transfer into the interior and lower indoor temperatures, roof insulation and cooling measures should be implemented. However, laying large areas of insulation material on pitched roofs presents challenges. Therefore, it is necessary to design a lightweight insulation material that is easy to install on pitched roofs. Summary of the Invention

[0003] In view of the problems existing in the prior art, the purpose of this invention is to provide a lightweight thermal insulation block that is easy to install on sloping roofs. This lightweight thermal insulation block has excellent compressive strength and thermal insulation performance.

[0004] A lightweight thermal insulation block that is easy to install on sloping roofs is prepared by the following steps:

[0005] Take 100 parts by weight of low-iron red mud, 25-65 parts by weight of fly ash, 20-30 parts by weight of water glass, 12.5-15.0 parts by weight of hydrogen peroxide, 1.0-1.2 parts by weight of Tween 80, 0.5-0.6 parts by weight of polyethylene glycol octylphenyl ether, 0.5-0.7 parts by weight of calcium stearate, and 180-200 parts by weight of water. Pour the low-iron red mud and fly ash into a container filled with water and stir at 300 r / min for 90 min. Then add water glass, Tween 80, and polyethylene glycol octylphenyl ether and stir at 500 r / min for 30 min. Then add hydrogen peroxide and calcium stearate and stir at 1000 r / min for 5 min. Finally, pour the slurry into a mold and let it stand to foam, thus obtaining a lightweight thermal insulation block suitable for installation on sloping roofs.

[0006] Preferably, the fly ash is 46.5 parts by weight.

[0007] Preferably, the water glass is Na2O·2.6SiO2.

[0008] Preferably, the Fe2O3 content of the low-iron red mud is less than 5.5 wt%.

[0009] Preferably, the water glass is in the form of 20 parts by weight.

[0010] Preferably, the mold size is 600mm×600mm×12mm.

[0011] Preferably, the mold size is 800mm×800mm×15mm.

[0012] Preferably, the hydrogen peroxide is present in 12.5 parts by weight.

[0013] This invention uses low-iron red mud as the main material and fly ash as a secondary material to prepare lightweight thermal insulation blocks. Research shows that when preparing lightweight thermal insulation blocks with low-iron red mud as the main component, the compressive strength of the product initially increases and then decreases with increasing fly ash content, reaching its highest point when the ratio of low-iron red mud to fly ash is 100:46.5. Simultaneously, with increasing fly ash content, the thermal conductivity of the product gradually decreases, meaning the thermal insulation performance is gradually optimized, and the decreasing trend of thermal conductivity slows down. Based on a comprehensive consideration of compressive strength and thermal insulation performance, a ratio of low-iron red mud to fly ash of 100:(25-65) is preferable. Furthermore, this invention prefabricates the lightweight thermal insulation material into blocks, facilitating installation on slopes and adapting to roofing material installation requirements. Detailed Implementation

[0014] The technical effects of the present invention will be verified through specific embodiments below, but the implementation of the present invention is not limited thereto.

[0015] The red mud selected in this invention is low-iron red mud from the Bayer process. Traditional Bayer process red mud has a high iron content. While a high iron content is beneficial for improving the strength of foamed materials, it also results in a larger mass, making it unsuitable as a main component of lightweight foamed insulation materials. To address this issue, this invention uses low-iron red mud from the Bayer process. Specifically, a reducing agent (such as formaldehyde or glycerol) is added to the Bayer process leaching to convert Fe2O3 to Fe3O4 at high temperature. The iron is then separated using magnetic separation to obtain low-iron red mud. The main components of the low-iron red mud selected in this invention are shown in Table 1.

[0016] Table 1 Composition of low-iron red mud

[0017] Percentage / wt% 43.6 34.8 14.1 5.1 margin

[0018] The fly ash used in this invention is the grade I fly ash specified in GB1596-91.

[0019] Example 1

[0020] Take 100 parts by weight of low-iron red mud, 25 parts by weight of fly ash, 20 parts by weight of water glass (Na2O·2.6SiO2), 12.5 parts by weight of hydrogen peroxide, 1.0 part by weight of Tween 80, 0.5 parts by weight of polyethylene glycol octylphenyl ether, 0.5 parts by weight of calcium stearate, and 180 parts by weight of water. Pour the low-iron red mud and fly ash into a container filled with water and stir at a rate of 300 r / min for 90 min. Then add water glass, Tween 80, and polyethylene glycol octylphenyl ether and stir at a rate of 500 r / min for 30 min. Then add hydrogen peroxide and calcium stearate and stir at a rate of 1000 r / min for 5 min. Finally, pour the slurry obtained from the stirring into a 600 mm × 600 mm × 12 mm mold and let it stand to foam, thus obtaining a lightweight thermal insulation block suitable for installation on sloping roofs.

[0021] Example 2

[0022] Take 100 parts by weight of low-iron red mud, 35 parts by weight of fly ash, 20 parts by weight of water glass (Na2O·2.6SiO2), 12.5 parts by weight of hydrogen peroxide, 1.0 part by weight of Tween 80, 0.5 parts by weight of polyethylene glycol octylphenyl ether, 0.5 parts by weight of calcium stearate, and 180 parts by weight of water. Pour the low-iron red mud and fly ash into a container filled with water and stir at a rate of 300 r / min for 90 min. Then add water glass, Tween 80, and polyethylene glycol octylphenyl ether and stir at a rate of 500 r / min for 30 min. Then add hydrogen peroxide and calcium stearate and stir at a rate of 1000 r / min for 5 min. Finally, pour the slurry obtained from the stirring into a 600 mm × 600 mm × 12 mm mold and let it stand to foam, thus obtaining a lightweight thermal insulation block suitable for installation on sloping roofs.

[0023] Example 3

[0024] Take 100 parts by weight of low-iron red mud, 46.5 parts by weight of fly ash, 20 parts by weight of water glass (Na2O·2.6SiO2), 12.5 parts by weight of hydrogen peroxide, 1.0 part by weight of Tween 80, 0.5 parts by weight of polyethylene glycol octylphenyl ether, 0.5 parts by weight of calcium stearate, and 180 parts by weight of water. Pour the low-iron red mud and fly ash into a container filled with water and stir at 300 r / min for 90 min. Then add water glass, Tween 80, and polyethylene glycol octylphenyl ether and stir at 500 r / min for 30 min. Then add hydrogen peroxide and calcium stearate and stir at 1000 r / min for 5 min. Finally, pour the slurry into a 600 mm × 600 mm × 12 mm mold and let it stand to foam, thus obtaining a lightweight thermal insulation block suitable for installation on sloping roofs.

[0025] Example 4

[0026] Take 100 parts by weight of low-iron red mud, 55 parts by weight of fly ash, 20 parts by weight of water glass (Na2O·2.6SiO2), 12.5 parts by weight of hydrogen peroxide, 1.0 part by weight of Tween 80, 0.5 parts by weight of polyethylene glycol octylphenyl ether, 0.5 parts by weight of calcium stearate, and 180 parts by weight of water. Pour the low-iron red mud and fly ash into a container filled with water and stir at a rate of 300 r / min for 90 min. Then add water glass, Tween 80, and polyethylene glycol octylphenyl ether and stir at a rate of 500 r / min for 30 min. Then add hydrogen peroxide and calcium stearate and stir at a rate of 1000 r / min for 5 min. Finally, pour the slurry obtained from the stirring into a 600 mm × 600 mm × 12 mm mold and let it stand to foam, thus obtaining a lightweight thermal insulation block suitable for installation on sloping roofs.

[0027] Example 5

[0028] Take 100 parts by weight of low-iron red mud, 65 parts by weight of fly ash, 20 parts by weight of water glass (Na2O·2.6SiO2), 12.5 parts by weight of hydrogen peroxide, 1.0 part by weight of Tween 80, 0.5 parts by weight of polyethylene glycol octylphenyl ether, 0.5 parts by weight of calcium stearate, and 180 parts by weight of water. Pour the low-iron red mud and fly ash into a container filled with water and stir at a rate of 300 r / min for 90 min. Then add water glass, Tween 80, and polyethylene glycol octylphenyl ether and stir at a rate of 500 r / min for 30 min. Then add hydrogen peroxide and calcium stearate and stir at a rate of 1000 r / min for 5 min. Finally, pour the slurry obtained from the stirring into a 600 mm × 600 mm × 12 mm mold and let it stand to foam, thus obtaining a lightweight thermal insulation block suitable for installation on sloping roofs.

[0029] Comparative Example 1

[0030] Take 100 parts by weight of low-iron red mud, 10 parts by weight of fly ash, 20 parts by weight of water glass (Na2O·2.6SiO2), 12.5 parts by weight of hydrogen peroxide, 1.0 part by weight of Tween 80, 0.5 parts by weight of polyethylene glycol octylphenyl ether, 0.5 parts by weight of calcium stearate, and 180 parts by weight of water. Pour the low-iron red mud and fly ash into a container filled with water and stir at a rate of 300 r / min for 90 min. Then add water glass, Tween 80, and polyethylene glycol octylphenyl ether and stir at a rate of 500 r / min for 30 min. Then add hydrogen peroxide and calcium stearate and stir at a rate of 1000 r / min for 5 min. Finally, pour the slurry obtained from the stirring into a 600 mm × 600 mm × 12 mm mold and let it stand to foam, thus obtaining a lightweight thermal insulation block suitable for installation on sloping roofs.

[0031] Comparative Example 2

[0032] Take 100 parts by weight of low-iron red mud, 80 parts by weight of fly ash, 20 parts by weight of water glass (Na2O·2.6SiO2), 12.5 parts by weight of hydrogen peroxide, 1.0 part by weight of Tween 80, 0.5 parts by weight of polyethylene glycol octylphenyl ether, 0.5 parts by weight of calcium stearate, and 180 parts by weight of water. Pour the low-iron red mud and fly ash into a container filled with water and stir at a rate of 300 r / min for 90 min. Then add water glass, Tween 80, and polyethylene glycol octylphenyl ether and stir at a rate of 500 r / min for 30 min. Then add hydrogen peroxide and calcium stearate and stir at a rate of 1000 r / min for 5 min. Finally, pour the slurry obtained from the stirring into a 600 mm × 600 mm × 12 mm mold and let it stand to foam, thus obtaining a lightweight thermal insulation block suitable for installation on sloping roofs.

[0033] Below, we evaluate the 7-day compressive strength and thermal conductivity of the samples from Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 2:

[0034] Table 2

[0035] Example 1 4.32 0.071 Example 2 4.71 0.064 Example 3 4.96 0.061 Example 4 4.63 0.055 Example 5 4.51 0.053 Comparative Example 1 3.89 0.093 Comparative Example 2 4.01 0.051

[0036] It is evident that when preparing lightweight thermal insulation blocks using low-iron red mud as the main component, the compressive strength of the product initially increases and then decreases with increasing fly ash content. The compressive strength reaches its highest point when the ratio of low-iron red mud to fly ash is 100:46.5. Simultaneously, the thermal conductivity of the product gradually decreases with increasing fly ash content, indicating a gradual optimization of its insulation performance. Furthermore, the decreasing trend in thermal conductivity gradually slows down. Considering both compressive strength and insulation performance, a ratio of low-iron red mud to fly ash of 100:(25-65) is recommended.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A lightweight thermal insulation block that is easy to install on sloping roofs, characterized in that, The preparation steps of the lightweight thermal insulation block are as follows: Take 100 parts by weight of low-iron red mud, 46.5-65 parts by weight of fly ash, 20-30 parts by weight of water glass, 12.5-15.0 parts by weight of hydrogen peroxide, 1.0-1.2 parts by weight of Tween 80, 0.5-0.6 parts by weight of polyethylene glycol octylphenyl ether, 0.5-0.7 parts by weight of calcium stearate, and 180-200 parts by weight of water; pour the low-iron red mud and fly ash into a container filled with water, stir at a rate of 300 r / min for 90 min, then add water glass, Tween 80, and polyethylene glycol octylphenyl ether, stir at a rate of 500 r / min for 30 min, then add hydrogen peroxide and calcium stearate, stir at a rate of 1000 r / min for 5 min, and finally pour the slurry obtained by stirring into a mold and let it stand to foam, thus obtaining a lightweight thermal insulation block suitable for installation on sloping roofs.

2. A lightweight thermal insulation block as described in claim 1, characterized in that, The fly ash is 46.5 parts by weight.

3. A lightweight thermal insulation block as described in claim 1, characterized in that, The water glass is Na2O·2.6SiO2.

4. A lightweight thermal insulation block as described in any one of claims 1-3, characterized in that, The Fe2O3 content of the low-iron red mud is less than 5.5 wt%.

5. A lightweight thermal insulation block as described in claim 1, characterized in that, The water glass is 20 parts by weight.

6. A lightweight thermal insulation block as described in claim 1, characterized in that, The mold dimensions are 600mm × 600mm × 12mm.

7. A lightweight thermal insulation block as described in claim 1, characterized in that, The mold dimensions are 800mm × 800mm × 15mm.

8. A lightweight thermal insulation block as described in claim 1, characterized in that, The hydrogen peroxide is 12.5 parts by weight.