Aerogel/inorganic lightweight aggregate composite thermal insulation material and preparation method thereof
A technology of inorganic light aggregate and composite thermal insulation, which is applied in the field of composite thermal insulation materials and its preparation, can solve problems such as poor mechanical strength, inability to use thermal insulation materials, low volume density of airgel, etc., and achieve low cost, Good fire performance, good thermal insulation effect
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Embodiment 1
[0041] (1) Using water glass with a modulus of 3.5 as the silicon source and boric acid as the additive to prepare B 2 o 3 The mass fraction of 6% mixed solution (wherein Na 2 O, SiO 2 The mass fractions are 21.4% and 72.6% respectively), after diluting 1:10 (volume ratio), take 1L and add 4g polyethylene oxide (molecular weight is 4 million), add 160ml of 2mol / L hydrochloric acid, and obtain the gel time Sol for about 1 hour.
[0042] (2) Then, under low pressure (4000Pa), mix the above sol with 1L expanded perlite, and after about 40 minutes, return to normal pressure to filter out the expanded perlite absorbed into the sol. At room temperature, after standing for about 30 minutes, the gel will be aged at 40°C for 1 day, and finally dried at 70, 90, 120, 200 and 400°C for two hours to obtain a composite of airgel and expanded perlite. insulation materials such as figure 1 shown. Bulk density from 70kg / m 3 Change to 80kg / m 3 . The thermal conductivity decreased from ...
Embodiment 2
[0044] (1) Using water glass with a modulus of 3.5 as the silicon source and boric acid as the additive to prepare B 2 o 3 The mass fraction of 6% mixed solution (wherein Na 2 O, SiO 2 The mass fractions are 21.4% and 72.6% respectively), diluted by 1:10 (volume ratio). Take 1L and add 160ml of hydrochloric acid (2mol / L) to prepare a sol.
[0045] (2) Then under low pressure (4000Pa), mix the sol with expanded perlite 1:1 (volume ratio). Then the expanded perlite was filtered out and aged for 1 day after standing to gel. Then mix it with supercritical carbon dioxide at 40°C and 10Mpa, let it stand for 1 day, and then circulate carbon dioxide at a rate of 6-8kg / h to dry for 1 hour to prepare a composite insulation of airgel and expanded perlite. hot materials such as figure 2 shown. Bulk density from 70kg / m 3 Change to 75kg / m 3 . The thermal conductivity decreased from 0.08w / (m·K) to 0.05w / (m·K), a drop of 37.5%.
Embodiment 3
[0047] (1) Using water glass with a modulus of 3.5 as the silicon source and boric acid as the additive to prepare B 2 o 3 The mass fraction of 6% mixed solution (wherein Na 2 O, SiO 2 The mass fractions are 21.4% and 72.6% respectively), after diluting by 1:10 (volume ratio), take 1L and then add 70ml of hexamethyldisilazane, and then add 160ml of hydrochloric acid (2mol / L) to make a sol .
[0048] (2) Then under low pressure (4000Pa), mix the sol with expanded perlite 1:1 (volume ratio). Then the expanded perlite was filtered out and aged for 1 day after standing to gel. Finally, it is dried at 70, 90, 120 and 200° C. for two hours respectively to prepare a composite thermal insulation material of super thermal insulation material and expanded perlite. Bulk density from 70kg / m 3 Change to 110kg / m 3 . The thermal conductivity decreased from 0.08w / (m·K) to 0.045w / (m·K), a decrease of 43.8%.
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