Preparation method of silicon oxide/phenolic aldehyde binary composite aerogel
A binary composite, silicon oxide technology, applied in composite aerogel and its preparation, silicon oxide/phenolic binary aerogel and its preparation field, can solve the problem of destroying the formation of phenolic aerogel network structure, increasing the viscosity of the mixed system, Alkaline matching is poor and other problems, to achieve the effect of increasing room temperature stability, excellent thermal insulation performance, and improving mechanical properties
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Embodiment 1
[0029] (1) Synthesis of alkaline alcohol solvent-type silica sol: Weigh 1mol of tetraethyl orthosilicate and place it in a three-necked flask, add 416g of ethanol solvent to the system, and stir the system evenly to obtain a mixed solution A; weigh 4mol of Deionized water, add concentrated ammonia water to it, and configure it as 200mmol / L ammonia solution B; add solution B dropwise to solution A at 40°C, and continue the reaction for 12 hours after the dropwise addition is completed to obtain 10% ethanol base Reactive silica sol.
[0030] (2) Configure the composite sol of silicon oxide and phenolic formaldehyde: Weigh 120g of boron phenolic resin, add it to 100g of ethanol alkaline silica sol, then add 68.9g of ethanol solvent, stir the mixed sol evenly, and then add curing agent black Rotropine 24g (20% of phenolic sol mass), continue to stir 2h, obtain the composite sol (the solute mass ratio is 12:1 in phenolic sol and silica sol) of clear solid content 45%;
[0031] (3)...
Embodiment 2
[0034] (1) Synthesis of alkaline alcohol solvent-type silica sol: Weigh 1mol of tetraethyl orthosilicate and place it in a three-necked flask, add 416g of ethanol solvent to the system, and stir the system evenly to obtain a mixed solution A; weigh 1mol of orthosilicate Deionized water, add concentrated ammonia water to it, and configure 10mmol / L ammonia solution B; add solution B dropwise to solution A at 90°C, and continue the reaction for 6 hours after the dropwise addition is completed to obtain 10% ethanol alkaline Silica sol.
[0035] (2) Configure the composite sol of silicon oxide and phenolic formaldehyde: Weigh 90g of molybdenum phenolic resin, add it to 900g of ethanol alkaline silica sol, then add 210g of ethanol solvent, stir the mixed sol evenly, and then add curing agent urethane Tropin 13.5g (15% of phenolic sol mass), continue to stir 12h, obtain the composite sol (the solute mass ratio is 1:1 in phenolic sol and silica sol) of clear solid content 15%;
[003...
Embodiment 3
[0039](1) Synthesis of alkaline alcohol solvent-type silica sol: Weigh 1mol of tetraethyl orthosilicate and place it in a three-necked flask, add 416g of ethanol solvent to the system, and stir the system evenly to obtain a mixed solution A; weigh 2mol of Deionized water, add concentrated ammonia water to it, and configure it as 50mmol / L ammonia solution B; add solution B dropwise to solution A at 70°C, and continue to react for 9 hours after the dropwise addition is completed to obtain 10% ethanol alkaline Silica sol.
[0040] (2) Composite sol of silicon oxide and phenolic formaldehyde: Weigh 100g of novolac resin, add it to 200g of the above ethanol silica sol, and then add 100g of ethanol solvent, stir the mixed sol evenly, and then add curing agent Uroto Product 10g (10% of phenolic sol mass), continue to stir 3h, obtain the composite sol (the solute mass ratio is 5:1 in phenolic sol and silica sol) of clear solid content 30%;
[0041] (3) Transfer the prepared composite...
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