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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

Inactive Publication Date: 2015-05-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of polysiloxane airgel, which solves the problems of cumbersome and time-consuming preparation steps of polysiloxane airgel, poor environmental protection and poor mechanical properties.

Method used

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  • Method for preparing polysiloxane aerogel
  • Method for preparing polysiloxane aerogel
  • Method for preparing polysiloxane aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, the preparation of polysiloxane airgel

[0035] The preparation method of polysiloxane airgel comprises the steps:

[0036] The molecular weight of 1.80g is 1500-3000g / mol (average molecular weight is 1700g / mol) methylhydrogen polysiloxane (hydrogen content is 0.2wt%), 5.12g of molecular weight is 1500-3000g / mol (average Molecular weight is 2000g / mol) terminal vinyl dimethyl polysiloxane and Karstedt's catalyst (mass is 0.05% of the sum of methylhydrogen polysiloxane and terminal vinyl dimethyl polysiloxane mass) into a 50mL reactor, CO at 40°C 2 Fill to make the pressure of the system reach 16MPa, while CO 2 It is in a supercritical fluid state and releases CO after 4 hours of reaction 2 Obtain bulk airgel 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 vinyl groups in the vinyl polysiloxane is 0.7:1.0.

[0038] Such as figure 1 with figure 2Sh...

Embodiment 2

[0039] Embodiment 2, the preparation of polysiloxane airgel

[0040] The preparation method of polysiloxane airgel comprises the steps:

[0041] 0.71g of methyl hydrogen polysiloxane (hydrogen content is 0.2wt%) with a molecular weight of 1500-3000g / mol (average molecular weight of 1700g / mol), 4.06g of a molecular weight of 5000-8000g / mol (average Molecular weight is 6000g / mol) terminal vinyl dimethyl polysiloxane and Karstedt's catalyst (mass is 0.05% of the sum of methylhydrogen polysiloxane and terminal vinyl dimethyl polysiloxane mass) In a 50mL reactor, CO at 40°C 2 Fill to make the pressure of the system reach 16MPa, while CO 2 It is in a supercritical fluid state and releases CO after 4 hours of reaction 2 Obtain bulk airgel 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 vinyl groups in the vinyl polysiloxane is 1.0:1.0.

[0043] The scanning electron microscop...

Embodiment 3

[0044] Embodiment 3, the preparation of polysiloxane airgel

[0045] The preparation method of polysiloxane airgel comprises the steps:

[0046] 0.80 g of methyl hydrogen polysiloxane (with a hydrogen content of 0.2 wt%) with a molecular weight of 1500-3000 g / mol (average molecular weight of 1700 g / mol), 7.80 g of a molecular weight of 9000-13000 g / mol ( The average molecular weight is 10000g / mol) terminal vinyl dimethyl polysiloxane and Karstedt's catalyst (mass is 0.05% of the sum of methyl hydrogen polysiloxane and terminal vinyl dimethyl polysiloxane mass) into a 50mL reactor, CO at 40°C 2 Fill to make the pressure of the system reach 16MPa, while CO 2 In a supercritical state, release CO after 4 hours of heat preservation and pressure 2 Obtain bulk airgel 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 vinyl groups in the vinyl polysiloxane is 1.0:1.0.

[0048] Th...

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Abstract

The invention discloses a method for preparing polysiloxane aerogel. The preparation method comprises the following steps: carrying out a cross-linking reaction between hydrogen-containing polysiloxane and vinyl polysiloxane in a supercritical fluid in the presence of a catalyst, thereby obtaining the polysiloxane aerogel. The supercritical fluid can be any one of supercritical carbon dioxide fluid, supercritical methane fluid and supercritical nitrogen dioxide fluid, and the catalyst can be a Karstedt's catalyst or chloroplatinic acid. By utilizing a green solvent, a flexible cuttable knittable super-hydrophobic silica aerogel material is prepared in the supercritical fluid by virtue of a simple one-step method; the obtained silica aerogel has high flexibility and ultrahigh hydrophobicity and can perform cutting and knitting, and the application requirements on different shapes, different conditions and different needs are met; and moreover, the production cost is low, the production process is simple and environment-friendly, and industrial production is easily realized.

Description

technical field [0001] The invention relates to a preparation method of polysiloxane airgel, in particular to a preparation method of flexible and woven superhydrophobic polysiloxane airgel. Background technique [0002] When most of the solvent is removed from the gel, the liquid content in the gel is much less than the solid content, or the space network structure of the gel is filled with gas, and the appearance is solid, which is called aerogel. There are many types of aerogels, including silicon-based, carbon-based, sulfur-based, metal oxide-based or metal-based, and so on. The common airgel is silica airgel, which was first prepared by American scientist Kistler in 1931. Due to its nano-porous and porous properties, aerogels are widely used in high-tech strong laser low-density target materials, high-efficiency heat insulation materials, acoustic delay materials, and high-performance catalysts. [0003] Silica airgel has the characteristics of nanoporous three-dimens...

Claims

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Application Information

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IPC IPC(8): C08G77/442C08G77/08C08G77/06
CPCY02P20/54
Inventor 李志波邹方鑫张建玲段春婷符文鑫
Owner INST OF CHEM CHINESE ACAD OF SCI
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