A kind of preparation method of graphene oxide modified flame retardant silica airgel
A technology of graphene modification and silica airgel, which is applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of flammability of thermal insulation materials, etc., and achieve excellent flame retardancy, excellent compression performance and hydrophobicity performance, effect of low thermal conductivity
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Embodiment 1
[0034] Add 3g of methyltrimethoxysilane, 2g of dimethyldimethoxysilane, 0.005g of acetic acid, 0.8g of CTAB (cetyltrimethylammonium bromide), and 15g of water into the beaker in turn, and stir magnetically for 30min , to fully hydrolyze the silane; then add 5 g of urea into the hydrolyzed solution, and stir vigorously for 10 min; then take 50 mg of graphene oxide, add it to the silica sol solution, fully stir and ultrasonicate for 5 min; pour the treated solution into In the mold, seal it, place it in an oven at 80°C for 48 hours, take out the reacted modified silicon wet gel, and replace it with isopropanol and n-hexane in sequence, and replace each solvent three times, each time for 10 hours, and replace After completion, dry at normal temperature and pressure to obtain 2.0wt% graphene oxide modified silica airgel, which is designated as sample A. Such as figure 1 As shown, the burning test results of the alcohol lamp of sample A show that 2.0wt% graphene oxide modified sil...
Embodiment 2
[0038] Add 3g of methyltrimethoxysilane, 2g of dimethyldimethoxysilane, 0.005g of acetic acid, 0.8g of CTAB (cetyltrimethylammonium bromide), and 15g of water into the beaker in turn, and stir magnetically for 30min , to fully hydrolyze the silane; then add 5 g of urea into the hydrolyzed solution, and stir vigorously for 10 minutes; then take 25 mg of graphene oxide, add it to the silica sol solution, fully stir and ultrasonicate for 5 minutes; pour the treated solution into In the mold, seal it, place it in an oven at 80°C for 48 hours, take out the reacted modified silicon wet gel, and replace it with isopropanol and n-hexane in sequence, and replace each solvent three times, each time for 10 hours, and replace After the completion, the graphene oxide modified silica airgel can be obtained by drying at normal temperature and pressure. Such as figure 2 As shown, the 1.0wt% graphene oxide modified airgel has high elasticity and excellent compression recovery performance, wh...
Embodiment 3
[0040] Add 3g of methyltrimethoxysilane, 2g of dimethyldimethoxysilane, 0.005g of acetic acid, 0.6g of CTAC (cetyltrimethylammonium chloride), and 15g of water into the beaker in sequence, and stir magnetically for 30min , to fully hydrolyze the silane; then add 5 g of urea into the hydrolyzed solution, and stir vigorously for 10 minutes; then take 70 mg of graphene oxide, add it to the silica sol solution, fully stir and ultrasonicate for 5 minutes; pour the treated solution into In the mold, seal it, place it in an oven at 80°C for 48 hours, take out the reacted modified silicon wet gel, and replace it with isopropanol and n-hexane in sequence, each solvent is replaced three times, each replacement is 8 hours, and the replacement After the completion, the graphene oxide modified silica airgel can be obtained by drying at normal temperature and pressure. Compared with the unmodified airgel, the flame retardant effect of the graphene oxide modified airgel is significantly impr...
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