Condensation type organic silicon resin aerogel and preparation method thereof
A silicone and condensation-type technology, applied in the field of condensation-type silicone resin airgel and its preparation, can solve the problems of inability to prepare condensation-type silicone resin airgel, long distance of active groups, and high degree of hydroxyl reaction , to achieve the effect of low overall cost, realization of cross-linking degree and simple reaction process
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Embodiment 1
[0044] 1. Dissolve 200g of Dowsil RSN 0806 (the solid content of the product itself is 50%, and the solvent is a mixed solvent of toluene and xylene), 5g of ethyl orthosilicate and 0.6g of dibutyltin dilaurate in 800g of ethyl acetate, stir at room temperature for 30min, and pour After standing in the mold, after the reaction system gels, it is aged at room temperature for 24 hours to obtain a condensation type silicone resin wet gel.
[0045] 2. Perform solvent replacement on the condensed silicone resin wet gel obtained in step 1, soak it repeatedly with cyclohexane for 3 times, and then perform supercritical CO 2 Dry, and dry at 40°C and 15MPa for 8 hours to obtain a condensation-type silicone resin airgel.
[0046] 3. Perform post-curing treatment on the airgel prepared in step 2. The treatment conditions are 60° C. for 1 hour, 80° C. for 1 hour, 100° C. for 1 hour, and 120° C. for 1 hour.
[0047] The density of the condensation type silicone resin airgel obtained in thi...
Embodiment 2
[0050] Except that the mass of tetraethyl orthosilicate added is 20g, the preparation conditions and process of the condensation type silicone resin airgel are the same as in Example 1, and the density of the airgel is 0.18g / cm 2 .
Embodiment 3
[0052] Except that the mass of tetraethyl orthosilicate added is 30g, the preparation conditions and process of the condensation type silicone resin airgel are the same as in Example 1, and the density of the airgel is 0.2g / cm 2 .
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