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Polyurethane-silicon hybrid aerogel and preparation method thereof

A technology of silicon hybridization and polyurethane, which is applied in the field of polyurethane-silicon hybrid airgel and its preparation, can solve the problems of non-resilience performance and other problems

Active Publication Date: 2021-07-06
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since silicon dioxide is the rigid skeleton structure in the entire molecular structure, the polyurethane-silicon-based composite aerogel is rigid and does not have resilience

Method used

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  • Polyurethane-silicon hybrid aerogel and preparation method thereof
  • Polyurethane-silicon hybrid aerogel and preparation method thereof
  • Polyurethane-silicon hybrid aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. Dissolve 60g of polytetrahydrofuran (molecular weight 600, 0.1mol), 50.05g of diphenylmethane diisocyanate (MDI, 0.2mol), 1.10g of dibutyltin dilaurate in 990.45g of DMF, react at 80°C for 6h under mechanical stirring, and obtain Isocyanate-terminated polyurethane oligomer solution; then add 44.28g (0.2mol) 3-aminopropyltriethoxysilane, and react at 80°C for 4h under mechanical stirring to obtain a siloxane-terminated polyurethane-silicon hybrid oligomer solution.

[0053] 2. Add 10.8 g of ammonia solution (0.6 mol / L) to the siloxane-terminated polyurethane-silicon hybrid oligomer solution prepared in the first step, mix well, pour it into a mold and let it stand until the reaction system solidifies After gelling, it was aged at 80°C for 24 hours to obtain a polyurethane-silicon hybrid wet gel.

[0054] 3. Perform solvent replacement on the condensed silicone resin wet gel obtained in step 2, soak it in ethanol repeatedly for 3 times, and then perform supercritical ...

Embodiment 2

[0058] Except that the molecular weight of polytetrahydrofuran added is 1000, the quality is 100g, the quality of dibutyltin dilaurate is 1.50g, and the quality of DMF is 1350.45g, the preparation conditions and process of high resilience polyurethane-silicon hybrid airgel and the examples 1 is the same, the airgel density is 0.19g / cm 2 .

Embodiment 3

[0060] Except that the molecular weight of polytetrahydrofuran added is 2000, the quality is 200g, the quality of dibutyltin dilaurate is 2.50g, and the quality of DMF is 2250.45g, the preparation conditions and process of high resilience polyurethane-silicon hybrid airgel and the examples 1 is the same, the airgel density is 0.21g / cm 2 .

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Abstract

The invention provides a polyurethane-silicon hybrid aerogel and a preparation method thereof. The preparation method comprises the following steps: under the catalysis of a polymerization catalyst, carrying out a polymerization reaction on polyether glycol and diisocyanate to obtain an isocyanate-terminated polyurethane oligomer, then adding monoamino siloxane to obtain a siloxane-terminated polyurethane oligomer, adding an aqueous solution of a gel catalyst, gelling, replacing the aged wet gel with a solvent, and carrying out supercritical drying to obtain the product. Through a special preparation process, the obtained polyurethane-silicon hybrid aerogel has high resilience on the basis of ensuring high-temperature performance, and solves technical problem that high-resilience aerogel cannot be prepared in the prior art.

Description

technical field [0001] The invention relates to a polyurethane-silicon hybrid airgel and a preparation method thereof, belonging to the technical field of airgel preparation. Background technique [0002] Airgel is a nanoporous material composed of colloidal particles or polymer molecules, which has the characteristics of low density, high specific surface area, and low thermal conductivity. Broad application prospects. [0003] At present, most of the reported aerogels do not have resilience. Under the action of external force, once the aerogel is deformed, the pore structure will be destroyed, or even the pore structure will collapse, resulting in a decrease in the thermal insulation performance of the aerogel, which seriously affects Thermal insulation performance stability of airgel under long-term stress environment. [0004] At present, the publicly reported polyurethane aerogels can achieve effective control of rigidity and flexibility by adjusting the ratio of its ...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L75/08C08K3/36C08G18/48
CPCC08J9/28C08G18/4854C08G18/4825C08J2375/08C08K3/36
Inventor 刘韬刘圆圆张恩爽雷朝帅郭慧李文静杨洁颖赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH