A light roof heat-insulating material

Abstract

The application discloses a light heat-insulation material, which uses silicate cement as a basic material of the light heat-insulation material, uses hydrogen peroxide as a foaming agent, uses sodium dodecyl benzene sulfonate as a surfactant, reduces the surface tension of bubbles, uses calcium stearate as a foam stabilizer, uses PP fiber to improve the flexibility of the material, and adjusts the addition amount of metakaolin to obtain the light heat-insulation material, which meets the use requirements of porosity, thermal conductivity and compressive strength. Compared with the same material in the prior art, the raw material composition is simple, the preparation process is convenient, and production is efficient. In addition, if the addition amount of metakaolin is too low, the compressive strength of the light heat-insulation material is insufficient, and if the addition amount of metakaolin is too high, the porosity of the light heat-insulation material is too low and the thermal conductivity is too high. Therefore, compared with 100 parts by weight of the silicate cement, the addition amount of metakaolin needs to be controlled in a range of 36 parts by weight to 73 parts by weight.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation materials, specifically to a lightweight thermal insulation material for roofs. Background Technology

[0002] Thermal insulation materials, also known as heat insulation materials, generally refer to materials that have a strong resistance to heat flow. According to their structure, thermal insulation materials can be divided into fibrous aggregates (inorganic or organic fibers and products), loose granular, flaky or powdery structures (such as lightweight aggregates, pumice, diatomaceous earth), porous structures (porous concrete, foam plastics, etc.), and dense structures (aluminum foil, etc.).

[0003] Thermal conductivity is a key indicator of thermal insulation performance. Materials with a thermal conductivity less than 0.12 W / (m·K) are generally considered thermal insulation materials. Thermal conductivity is primarily related to the material's density, porosity, and pore structure. Generally, the higher the porosity of a material, the lighter its weight, the lower its thermal conductivity, and the better its insulation performance. However, excessively pursuing high porosity can lead to a decrease in the material's compressive strength, causing serious adverse consequences. Therefore, it is necessary to design lightweight thermal insulation materials that meet the requirements for performance in terms of porosity, thermal conductivity, and compressive strength. Summary of the Invention

[0004] The purpose of this invention is to provide a lightweight roof insulation material with excellent porosity, thermal conductivity and compressive strength.

[0005] The technical solution of the present invention is as follows:

[0006] A lightweight roof insulation material is prepared by the following method:

[0007] Take 100 parts by weight of silicate cement, 36-73 parts by weight of metakaolin, and 160-200 parts by weight of water and place them in a container. Use a multi-purpose dispersion mill to stir at a first speed of 500-800 r / min for 30-60 min. Then add 3-5 parts by weight of PP fiber and stir at a second speed of 300-350 r / min for 10-15 min. Next, add 10-12 parts by weight of hydrogen peroxide, 3-3.5 parts by weight of sodium dodecylbenzenesulfonate, and 1.5-1.8 parts by weight of calcium stearate and stir at a third speed of 3000-3200 r / min for 3-4 min. Finally, pour the stirred slurry into a mold and let it stand to foam to obtain a lightweight thermal insulation material.

[0008] Preferably, the first rate is 800 r / min.

[0009] Preferably, the second rate is 300 r / min.

[0010] Preferably, the third rate is 3000 r / min.

[0011] Preferably, the metakaolin is 65.5 parts by weight.

[0012] Preferably, the amount of calcium stearate is 1.5 parts by weight.

[0013] Preferably, the hydrogen peroxide is in the form of 10 parts by weight.

[0014] This invention uses silicate cement as the basic material for lightweight thermal insulation, hydrogen peroxide as a foaming agent, sodium dodecylbenzene sulfonate as a surfactant to reduce the surface tension of bubbles, calcium stearate as a foam stabilizer, and PP fiber to improve the material's flexibility. By adjusting the amount of metakaolin added, a lightweight thermal insulation material with porosity, thermal conductivity, and compressive strength meeting the application requirements was obtained. Compared with similar materials in existing technologies, the raw material composition is simple, the preparation process is convenient, and production is highly efficient. Furthermore, too little metakaolin will result in insufficient compressive strength of the lightweight thermal insulation material, while too much metakaolin will result in excessively low porosity and excessively high thermal conductivity. Therefore, the amount of metakaolin should be controlled between 36 and 73 parts by weight relative to 100 parts by weight of silicate cement. Implementation

[0015] 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. Example

[0016] Take 100 parts by weight of silicate cement, 36 parts by weight of metakaolin, and 160 parts by weight of water and place them in a container. Stir them for 30 minutes at a speed of 800 r / min using a multi-purpose dispersion mill. Then add 3 parts by weight of PP fiber and stir for 10 minutes at a speed of 300 r / min. Next, add 10 parts by weight of hydrogen peroxide, 3 parts by weight of sodium dodecylbenzenesulfonate, and 1.5 parts by weight of calcium stearate and stir for 3 minutes at a speed of 3000 r / min. Finally, pour the slurry obtained from the stirring into a mold and let it stand to foam, thus obtaining a lightweight thermal insulation material. Example

[0017] Take 100 parts by weight of silicate cement, 43 parts by weight of metakaolin, and 160 parts by weight of water and place them in a container. Stir them for 30 minutes at a speed of 800 r / min using a multi-purpose dispersion mill. Then add 3 parts by weight of PP fiber and stir for 10 minutes at a speed of 300 r / min. Next, add 10 parts by weight of hydrogen peroxide, 3 parts by weight of sodium dodecylbenzenesulfonate, and 1.5 parts by weight of calcium stearate and stir for 3 minutes at a speed of 3000 r / min. Finally, pour the stirred slurry into a mold and let it stand to foam, thus obtaining a lightweight thermal insulation material. Example

[0018] Take 100 parts by weight of silicate cement, 59 parts by weight of metakaolin, and 160 parts by weight of water and place them in a container. Stir them for 30 minutes at a speed of 800 r / min using a multi-purpose dispersion mill. Then add 3 parts by weight of PP fiber and stir for 10 minutes at a speed of 300 r / min. Next, add 10 parts by weight of hydrogen peroxide, 3 parts by weight of sodium dodecylbenzenesulfonate, and 1.5 parts by weight of calcium stearate and stir for 3 minutes at a speed of 3000 r / min. Finally, pour the slurry obtained from the stirring into a mold and let it stand to foam, thus obtaining a lightweight thermal insulation material. Example

[0019] Take 100 parts by weight of silicate cement, 65.5 parts by weight of metakaolin, and 160 parts by weight of water and place them in a container. Stir them for 30 minutes at a speed of 800 r / min using a multi-purpose dispersion mill. Then add 3 parts by weight of PP fiber and stir for 10 minutes at a speed of 300 r / min. Next, add 10 parts by weight of hydrogen peroxide, 3 parts by weight of sodium dodecylbenzenesulfonate, and 1.5 parts by weight of calcium stearate and stir for 3 minutes at a speed of 3000 r / min. Finally, pour the slurry obtained from the stirring into a mold and let it stand to foam, thus obtaining a lightweight thermal insulation material. Example

[0020] Take 100 parts by weight of silicate cement, 73 parts by weight of metakaolin, and 160 parts by weight of water and place them in a container. Stir them for 30 minutes at a speed of 800 r / min using a multi-purpose dispersion mill. Then add 3 parts by weight of PP fiber and stir for 10 minutes at a speed of 300 r / min. Next, add 10 parts by weight of hydrogen peroxide, 3 parts by weight of sodium dodecylbenzenesulfonate, and 1.5 parts by weight of calcium stearate and stir for 3 minutes at a speed of 3000 r / min. Finally, pour the stirred slurry into a mold and let it stand to foam, thus obtaining a lightweight thermal insulation material.

[0021] Comparative Example 1

[0022] Take 100 parts by weight of silicate cement, 15 parts by weight of metakaolin, and 160 parts by weight of water and place them in a container. Stir them for 30 minutes at a speed of 800 r / min using a multi-purpose dispersion mill. Then add 3 parts by weight of PP fiber and stir for 10 minutes at a speed of 300 r / min. Next, add 10 parts by weight of hydrogen peroxide, 3 parts by weight of sodium dodecylbenzenesulfonate, and 1.5 parts by weight of calcium stearate and stir for 3 minutes at a speed of 3000 r / min. Finally, pour the slurry obtained from the stirring into a mold and let it stand to foam, thus obtaining a lightweight thermal insulation material.

[0023] Comparative Example 2

[0024] Take 100 parts by weight of silicate cement, 95 parts by weight of metakaolin, and 160 parts by weight of water and place them in a container. Stir them for 30 minutes at a speed of 800 r / min using a multi-purpose dispersion sand mill. Then add 3 parts by weight of PP fiber and stir for 10 minutes at a speed of 300 r / min. Next, add 10 parts by weight of hydrogen peroxide, 3 parts by weight of sodium dodecylbenzenesulfonate, and 1.5 parts by weight of calcium stearate and stir for 3 minutes at a speed of 3000 r / min. Finally, pour the stirred slurry into a mold and let it stand to foam, thus obtaining a lightweight thermal insulation material.

[0025] Next, we evaluated the density, thermal conductivity, and compressive strength of the samples in Examples 1-5 and Comparative Examples 1-2. The thermal conductivity of the materials was measured using a DRH-III thermal conductivity meter. The porosity was calculated by comparing the density of the lightweight thermal insulation material after solidification with that of the pure cementitious material. For compressive strength, a test sample with a diameter of 30 mm and a height of 80 mm was continuously pressurized at a loading rate of 2.0 KN / s until the sample reached its failure state. The failure load was recorded, and the compressive strength of the sample was calculated accordingly. The test results are shown in Table 1.

[0026] Table 1. Porosity, thermal conductivity, and compressive strength of each sample

[0027] serial number Porosity / % <![CDATA[Thermal conductivity / W·m -1 ·K -1 > Compressive strength / MPa Example 1 25.1 0.21 2.44 Example 2 26.3 0.25 2.60 Example 3 27.6 0.17 2.89 Example 4 30.2 0.11 3.11 Example 5 27.3 0.29 3.15 Comparative Example 1 33.7 0.17 1.83 Comparative Example 2 19.6 0.56 3.51

[0028] This invention uses silicate cement as the basic material for lightweight thermal insulation, hydrogen peroxide as a foaming agent, sodium dodecylbenzene sulfonate as a surfactant to reduce the surface tension of bubbles, calcium stearate as a foam stabilizer, and PP fiber to improve the material's flexibility. By adjusting the amount of metakaolin added, a lightweight thermal insulation material with porosity, thermal conductivity, and compressive strength meeting the application requirements was obtained. As shown in Table 1, too low a amount of metakaolin will result in insufficient compressive strength of the lightweight thermal insulation material, while too high a amount will result in excessively low porosity and excessively high thermal conductivity. Therefore, relative to 100 parts by weight of silicate cement, the amount of metakaolin should be controlled between 36 and 73 parts by weight.

[0029] 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 material for roofs, characterized by achieving the required porosity, thermal conductivity, and compressive strength by adjusting the amount of metakaolin added, wherein the material meets the usage requirements. The lightweight thermal insulation material for the roof is prepared by the following method: Take 100 parts by weight of silicate cement, 59-73 parts by weight of metakaolin, and 160-200 parts by weight of water and place them in a container. Use a multi-purpose dispersion mill to stir at a first speed of 500-800 r / min for 30-60 min. Then add 3-5 parts by weight of PP fiber and stir at a second speed of 300-350 r / min for 10-15 min. Next, add 10-12 parts by weight of hydrogen peroxide, 3-3.5 parts by weight of sodium dodecylbenzenesulfonate, and 1.5-1.8 parts by weight of calcium stearate and stir at a third speed of 3000-3200 r / min for 3-4 min. Finally, pour the stirred slurry into a mold and let it stand to foam to obtain a lightweight thermal insulation material.

2. A lightweight roof insulation material as described in claim 1, characterized in that, The first rate is 800 r / min.

3. A lightweight roof insulation material as described in claim 1, characterized in that, The second rate is 300 r / min.

4. A lightweight roof insulation material as described in claim 1, characterized in that, The third rate is 3000 r / min.

5. A lightweight roof insulation material as described in claim 1, characterized in that, The metakaolin clay is 65.5 parts by weight.

6. A lightweight roof insulation material as described in claim 1, characterized in that, The amount of calcium stearate is 1.5 parts by weight.

7. A lightweight roof insulation material as described in claim 1, characterized in that, The hydrogen peroxide is 10 parts by weight.