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Method for preparing silica aerogel and self-hydrophobic silica aerogel heat preservation felt pad through one-step technology

A silica and aerogel technology, applied in the field of materials, can solve the problems of complex process flow, acid catalyst corrosion, shortening processing cycle, etc., and achieve the effect of widening the application field, good void structure, and shortening production time

Active Publication Date: 2020-04-21
IBIH ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems in the prior art that the preparation of hydrophobic silica airgel by using "acid-base two-step catalysis" has complicated process flow, long cycle, and corrosion of equipment caused by acid catalyst, and provides a one-step A method for preparing silica airgel, in which there is no need to add an acid catalyst to sol the silicon source precursor, simplify the process flow, shorten the processing cycle, and prolong the service life of the equipment

Method used

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  • Method for preparing silica aerogel and self-hydrophobic silica aerogel heat preservation felt pad through one-step technology
  • Method for preparing silica aerogel and self-hydrophobic silica aerogel heat preservation felt pad through one-step technology
  • Method for preparing silica aerogel and self-hydrophobic silica aerogel heat preservation felt pad through one-step technology

Examples

Experimental program
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Effect test

Embodiment 1

[0108] The silicon source precursor A methyl orthosilicate and the silicon source precursor B methyltrimethoxysilane (R1 is methyl, R2 is methoxy, n=1, m=3), methanol and water by mass ratio =1:2.5:60:1.5 Stir and mix to prepare a premixed solution; add 25% ammonia water to the premixed solution at 2 / 10,000 of the total mass of the premixed solution, stir evenly to prepare a gel solution; react for 1h , after waiting for the gel to complete, place the gel block in an environment of 50°C for 24 hours; then place the gel block in a drying kettle, 2 Use a pump to enter the drying kettle to keep the supercritical temperature of the drying kettle at 65°C and the pressure at 17MPa; CO 2 The flow rate through the supercritical drying tank is 2500 L / h, and the drying time is 24 hours to obtain silica airgel P1. After testing, the specific surface area of ​​silica airgel P1 is 1070.7m 3 / g, and its thermal conductivity is shown in Table 1.

Embodiment 2

[0110] Prepare silica airgel according to the method of Example 1, the difference is: the silicon source precursor B methyltrimethoxysilane (R1 is methyl, R2 is methoxy, n=1, m=3) Replaced with silicon source precursor B dimethyldiethoxysilane (R 1 is methyl, R 2 is ethoxy, n=2, m=2). Silica airgel P2 was prepared. After testing, the thermal conductivity of the silica airgel P2 is shown in Table 1.

Embodiment 3

[0112] Silica airgel was prepared according to the method of Example 1, except that the silicon source precursor A, methyl orthosilicate, was replaced by ethyl orthosilicate. Silica airgel P3 was prepared. After testing, the thermal conductivity of the silica airgel P3 is shown in Table 1.

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Abstract

The invention relates to the technical field of materials, and discloses a method for preparing silica aerogel by a one-step technology. The method comprises the following steps: (1) mixing and stirring a silicon source precursor A, a silicon source precursor B, a solvent and water to obtain a premixed solution; (2) mixing a gel catalyst with the premixed solution, and carrying out a gel reactionto obtain silica wet gel; (3) aging and drying the silica wet gel to obtain the silica aerogel, wherein the silicon source precursor A is selected from tetramethyl orthosilicate and / or tetraethoxysilane; the silicon source precursor B has a general formula structure represented by the following formula I: (R1)n-Si-(R2)m; and in the formula I, and R1 is a methyl group, R2 is a methoxy group and / oran ethoxy group, n is an integer from 1 to 3, and m + n = 4. The silica aerogel has a good pore structure, a large specific surface area and low thermal conductivity. The self-hydrophobic silica aerogel heat preservation felt pad not only has low thermal conductivity, but also has high hydrophobicity.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for preparing silica airgel by a one-step method and a method for preparing a self-hydrophobic silica airgel insulation felt pad by a one-step method. Background technique [0002] With the rapid development of the economy, the demand for various energy sources is increasing; at the same time, there are still problems in my country, such as a large amount of energy, a small amount of energy per capita, and low energy utilization. In order to actively respond to my country's development strategy of energy conservation and emission reduction, high-efficiency energy-saving materials are developed, in order to reduce energy loss and waste through heat preservation and cold preservation, and improve energy utilization. [0003] SiO 2 Airgel is a SiO 2 It is a mesoporous amorphous material with a nanoporous network structure formed by colloidal particles clustering with ea...

Claims

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Application Information

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IPC IPC(8): C01B33/158
CPCC01B33/1585C01P2006/10C01P2006/32
Inventor 邱丽娟范俊杰杜泉岭李琴
Owner IBIH ADVANCED MATERIALS CO LTD
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