Method for preparing polysiloxane aerogel
A technology of polysiloxane and hydrogen polysiloxane, which is applied in the field of preparation of flexible and woven superhydrophobic polysiloxane airgel, can solve the problems of poor environmental protection, complicated and time-consuming preparation steps of polysiloxane airgel, Poor mechanical properties and other problems, to achieve the effect of low production cost, easy industrial production, simple and environmentally friendly production process
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[0034] Example 1. Preparation of polysiloxane aerogel
[0035] The preparation method of polysiloxane aerogel includes the following steps:
[0036] The molecular weight of 1.80g is 1500-3000g / mol (average molecular weight is 1700g / mol) methyl hydrogen-containing polysiloxane (the hydrogen content is 0.2wt%), the molecular weight of 5.12g is 1500-3000g / mol (average The molecular weight is 2000g / mol) vinyl-terminated dimethyl polysiloxane and Karstedt's catalyst (the mass is 0.05% of the total mass of methyl hydrogen-containing polysiloxane and vinyl-terminated polysiloxane) Into the 50mL reactor, CO at 40℃ 2 Filling to make the system pressure reach 16MPa, while CO 2 In a supercritical fluid state, CO will be released after 4 hours of reaction 2 Obtain block aerogel directly.
[0037] In this embodiment, the ratio of the number of moles of Si-H in the methyl hydrogen-containing polysiloxane to the number of moles of the vinyl group in the vinyl polysiloxane is 0.7:1.0.
[0038] Such ...
Example Embodiment
[0039] Example 2. Preparation of polysiloxane aerogel
[0040] The preparation method of polysiloxane aerogel includes the following steps:
[0041] The 0.71g molecular weight is 1500-3000g / mol (average molecular weight is 1700g / mol) methyl hydrogen-containing polysiloxane (hydrogen content is 0.2wt%), 4.06g molecular weight is 5000-8000g / mol (average The molecular weight is 6000g / mol) vinyl-terminated dimethyl polysiloxane and Karstedt's catalyst (the mass is 0.05% of the sum of the mass of methyl hydrogen-containing polysiloxane and vinyl-terminated polysiloxane) In a 50mL reactor, CO at 40℃ 2 Filling to make the system pressure reach 16MPa, while CO 2 In a supercritical fluid state, CO will be released after 4 hours of reaction 2 Obtain block aerogel directly.
[0042] In this embodiment, the ratio of the number of moles of Si-H in the methyl hydrogen-containing polysiloxane to the number of moles of the vinyl group in the vinyl polysiloxane is 1.0:1.0.
[0043] The scanning elect...
Example Embodiment
[0044] Example 3. Preparation of polysiloxane aerogel
[0045] The preparation method of polysiloxane aerogel includes the following steps:
[0046] The 0.80g molecular weight is 1500-3000g / mol (average molecular weight is 1700g / mol) methyl hydrogen-containing polysiloxane (its hydrogen content is 0.2wt%), 7.80g molecular weight is 9000-13000g / mol ( The average molecular weight is 10000g / mol) vinyl-terminated dimethyl polysiloxane and Karstedt's catalyst (the mass is 0.05% of the sum of the mass of methyl hydrogen-containing polysiloxane and vinyl-terminated polysiloxane) Add to 50mL reactor, CO at 40℃ 2 Filling to make the system pressure reach 16MPa, while CO 2 In a supercritical state, CO will be released after 4 hours of heat preservation and pressure preservation 2 Obtain block aerogel directly.
[0047] In this embodiment, the ratio of the number of moles of Si-H in the methyl hydrogen-containing polysiloxane to the number of moles of the vinyl group in the vinyl polysiloxane ...
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