Flexible thermal insulation aerogel material and preparation method and application thereof
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An airgel and flexible technology, applied in the direction of electrical components, conductors, insulated cables, etc., can solve the problems of complex preparation process, high cost, and unsatisfactory heat insulation performance, and achieve good flexibility, low cost, and avoid easy to break sexual effect
Active Publication Date: 2019-09-24
南京荣港电气技术有限公司
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Problems solved by technology
However, on the one hand, the preparation process is complicated and the cost is high. On the other hand, due to the fragility of airgel, the requirements for installation and laying are extremely high, which leads to its unsatisfactory thermal insulation performance in actual use.
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Embodiment 1
[0035] A method for preparing a flexible heat-insulating airgel material, comprising the steps of:
[0036] S1. Gradually add 1 part of phosphoric acid into the mixed system of 10 parts of tetraethyl orthosilicate and 200 parts of deionized water, then stir at 1500 r / min for 2 hours, and under the catalysis of phosphoric acid, hydrolyze and preshrink to obtain a silicon solution;
[0037] S2. Mix 10 parts of vinyl chloride with the silicon solution, and stir at 1500 r / min for 4 hours to obtain a silicon dioxide precursor solution.
[0038] S3. The silicon dioxide precursor solution is placed in a vacuum oven and dried at a temperature of 105°C to remove the residual deionized water in the solution; then placed in a muffle furnace at a temperature of 900°C in an air atmosphere, and calcined for 3h to The organic components in the solution are removed to obtain a silica fiber film.
[0039] S4. Shred the silica fiber film and mix it with 100 parts of deionized water, and then u...
Embodiment 2
[0051] A method for preparing a flexible heat-insulating airgel material, comprising the steps of:
[0052] S1. Gradually add 2 parts of phosphoric acid into the mixed system of 8 parts of ethyl tetrasilicate and 120 parts of deionized water, then stir at 1500r / min for 2 hours, and under the catalysis of phosphoric acid, hydrolyze and preshrink to obtain a silicon solution;
[0053] S2. Mix 8 parts of vinyl chloride with the silicon solution, and stir at 1500 r / min for 4 hours to obtain a silicon dioxide precursor solution.
[0054] S3. The silicon dioxide precursor solution is placed in a vacuum oven and dried at a temperature of 105°C to remove the residual deionized water in the solution; then placed in a muffle furnace at a temperature of 900°C in an air atmosphere, and calcined for 3h to The organic components in the solution are removed to obtain a silica fiber film.
[0055] S4. Shred the silica fiber film and mix it with 200 parts of deionized water, and then use a hi...
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Abstract
The invention discloses a flexible thermal insulation aerogel material and a preparation method and application thereof and belongs to a thermal insulation material. The method comprises the following steps of preparing a composite nanofiber aerogel solution; then, placing inorganic fibers into the composite nanofiber aerogel solution for soaking, carrying out freeze drying to obtain inorganic fibers of the composite aerogel, and finally weaving the organic fibers of the composite aerogel into aerogel felt in different shapes, wherein the aerogel felt is used as a flexible thermal insulation layer to be applied to a flexible fireproof explosion-proof layer for manufacturing a medium-high voltage cable joint. According to the method, an explosion-proof core layer, the flexible thermal insulation layer and a flexible fireproof layer are sewed into a whole part through high-temperature resistant wires, so that the functions of explosion prevention, fire prevention and thermal insulation are integrated, and meanwhile, the flexibility of the fireproof explosion-proof layer is ensured. The core of the flexible thermal insulation layer of the aerogel material lies in the preparation of the aerogel felt, and the inorganic fibers are in dip dyeing with the aerogel to provide a carrier for the aerogel, so that the thermal insulation performance of the aerogel is ensured, and meanwhile the aerogel is effectively prevented from being folded easily.
Description
technical field [0001] The invention belongs to a heat insulating material, in particular to a flexible heat insulating airgel material, a preparation method and an application thereof. Background technique [0002] In recent years, with the continuous development of social economy, the need for urban power transmission and distribution lines to be equipped with utility poles, the application of cables has become a significant development trend, and the number of cables and cable kilometers on the line are also increasing day by day. Due to urban development According to planning requirements, more and more cable tunnels are used. In order to save channel resources, the application of small-diameter tunnels, pipes + cable wells for laying cables is very common. While bringing convenience to people, there are also many problems. Among them, the cable joint is affected by human factors, construction, and environmental factors. When a fire, breakdown or even explosion accident ...
Claims
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