Atmospheric-pressure preparation method of silicon dioxide aerogel heat-insulating board
A technology of silica and airgel, which is applied to ceramic products, applications, household appliances, etc., can solve the problems of falling powder and slag, and poor heat insulation of airgel heat insulation boards, so as to achieve small consumption and eliminate Powder slag phenomenon, the effect of uniform pore distribution
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Embodiment 1
[0052] Such as figure 1 Shown, a kind of atmospheric pressure preparation method of silica airgel insulation board, comprises the following steps:
[0053] 1), the preparation of airgel:
[0054] A), resin treatment: put phenolic resin into ethanol solvent (mass concentration 95%) and fully dissolve at 50 ℃, the molar ratio of phenolic resin and ethanol solvent is 1:8;
[0055] B), preparation of sol: quickly mix ethyl orthosilicate and ethanol (mass concentration 95%) in a molar ratio of 1:15, stir at 800rpm / min for 3min to form a mixed solution, and then immediately add urea (orthosilicate The molar ratio of ethyl ester to urea is 1:0.6), stirred at 35°C and 800rpm / min for 30min to make a sol;
[0056] C), preparation of mixed gel: the phenolic resin and surfactant (KH570) processed through step A) are added in the sol prepared through step B) according to a certain mass ratio and fully mixed, the mass ratio of phenolic resin, KH570 and sol 1:0.05:20 to form a mixed sol o...
Embodiment 2
[0060] Such as figure 1 Shown, a kind of atmospheric pressure preparation method of silica airgel insulation board, comprises the following steps:
[0061] 1), the preparation of airgel:
[0062] A), resin treatment: put alkyd resin into methanol solvent (mass concentration 95%) and fully dissolve at 60°C, the molar ratio of alkyd resin to methanol solvent is 1:10;
[0063] B), preparation of sol: quickly mix methyl orthosilicate and methanol (mass concentration 95%) solution at a molar ratio of 1:18, stir at 1000rpm / min for 4min to form a mixed solution, then immediately add urea (orthosilicate The molar ratio of methyl ester to urea is 1:0.8), stirred at 40°C and 1000rpm / min for 40min to make a sol;
[0064] C), preparation of mixed gel: the alkyd resin and surfactant (KH570) processed through step A) are added in the sol prepared through step B) according to a certain mass ratio and fully mixed, the alkyd resin, KH570 and sol The mass ratio is 1:0.06:20 to form a mixed s...
Embodiment 3
[0068] Such as figure 1 Shown, a kind of atmospheric pressure preparation method of silica airgel insulation board, comprises the following steps:
[0069] 1), the preparation of airgel:
[0070] A), resin treatment: put epoxy resin into methanol solvent (mass concentration 95%) and fully dissolve at 60°C, the molar ratio of alkyd resin to methanol solvent is 1:6;
[0071] B), sol preparation: quickly mix methyltrimethoxysilane and methanol (mass concentration 95%) solution at a molar ratio of 1:20, stir at 1000rpm / min for 5min to form a mixed solution, then immediately add urea (orthosilicon The molar ratio of methyl ester to urea is 1:0.5), stirred at 45°C and 1200rpm / min for 55min to make a sol;
[0072] C), preparation of mixed gel: the epoxy resin, surfactant (KH570) processed through step A) will be added in the sol prepared through step B) according to a certain mass ratio and fully mixed, the epoxy resin, KH570 and sol The mass ratio is 1:0.07:20 to form a mixed sol...
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