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SiO2 aerogel insulation board and preparation method thereof

A technology of insulation board and airgel, which is applied in the field of preparation technology of nanoporous materials, can solve the problems of ignoring the tensile strength and so on

Active Publication Date: 2022-02-01
四川三棵树涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical product is mainly aimed at the wrapping of pipes and needs to have certain flexibility characteristics. The airgel felt mainly focuses on the tensile strength in the horizontal direction and the compressive strength in the vertical direction, while ignoring the tensile strength perpendicular to the board surface. strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] With 0.073mol tetraethyl orthosilicate, 0.027mol allyltrimethoxysilane, 2.51mol absolute ethanol, 2.25mol deionized water, 60ml hydrochloric acid (0.01mol / L) as the mixed solution of acidic catalyst at room temperature Under constant stirring, after 40min, add ammonia solution (1mol / L) to adjust the pH value to 6.7, continue to stir evenly, and obtain SiO 2 sol; will give SiO 2 The sol is directly poured into a mold with a glass fiber board, left to stand, and gelled for 4 hours to obtain a composite material;

[0035] After 4 hours of gelation, the wet gel composited with glass fiber boards was aged at 50°C for 48 hours with a mixed solution of deionized water and absolute ethanol with a volume ratio of 1:1, and replaced every 12 hours. After aging, the glass fiber boards were composited The wet gel was modified by soaking in 800ml of a mixed solution of absolute ethanol, trimethylchlorosilane and n-hexane with a volume ratio of 1:2.16:21.6 for 17h. Take out the wet ...

Embodiment 2

[0038] With 0.1mol tetraethyl orthosilicate, 0.03mol vinyltriethoxysilane, 3.425mol absolute ethanol, 3.1mol deionized water, 83.1ml oxalic acid (0.01mol / L) as the mixed solution of acidic catalyst at room temperature Stir continuously under the conditions, add ammonia water (1mol / L) after 40min to adjust the pH value to 6.7, continue to stir evenly, and obtain SiO 2 sol; will give SiO 2 The sol is directly poured into a mold with a pretreated glass fiber board, left to stand and gelled for 4 hours to obtain a composite material;

[0039] After 4 hours of gelation, the glass fiber board composite wet gel was aged at 50°C for 48 hours with a mixed solution of deionized water and absolute ethanol with a volume ratio of 1:1, and replaced every 12 hours. The aged composite material was soaked in the volume Modified in 800ml mixed solution of absolute ethanol, trimethylchlorosilane and n-hexane with a ratio of 1:2.2:23 for 18h. Take out the wet gel composited with the modified gl...

Embodiment 3

[0042] With 0.144mol tetramethyl orthosilicate, 0.05mol allyl trimethoxysilane, 5.29mol methanol, 4.753mol deionized water, 131.9ml hydrochloric acid (0.01mol / L) as the mixed solution of acidic catalyst at room temperature Stir constantly, add sodium hydroxide solution (1mol / L) after 45min to adjust the pH value to 6.8, continue to stir evenly, obtain SiO 2 sol; will give SiO 2 The sol is directly poured into a mold with a composite glass fiber board, left to stand and gelled for 6 hours to obtain a composite material;

[0043] After 5 hours of gelation, the wet gel composited with the composite glass fiber board is aged at 55°C for 60 hours with a mixed solution of deionized water and isopropanol with a volume ratio of 1.5:1, and replaced every 12 hours. The aged composite material is soaked Modified in 800ml mixed solution of absolute ethanol, trimethylchlorosilane and n-hexane with a volume ratio of 1:2.43:27 for 20h. Take out the wet gel compounded by the modified compos...

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Abstract

The invention relates to a SiO2 aerogel insulation board and a preparation method thereof. The preparation method comprises the following steps: (1) preparation of SiO2 sol, (2) preparation of a composite material, (3) aging of the composite material, (4) modification of the composite material, and (5) drying of the composite material. Compared with a traditional organic foam thermal insulation material, the SiO2 aerogel thermal insulation board prepared by the method is low in thermal conductivity and high in strength, can be used at the room temperature to 600 DEG C, and solves the problems that a traditional organic thermal insulation material is poor in fire resistance rating and poor in oxidation resistance.

Description

technical field [0001] The invention belongs to the field of preparation technology of nanoporous materials, in particular to a SiO 2 Airgel insulation board and preparation method thereof. Background technique [0002] Airgel is composed of a nano-network formed by colloidal particles or polymer molecules aggregated with each other and the nano-pores formed. The porosity is above 80%, the pore size is 2-100nm, and the specific surface area is 300-1000m 2 / g, is a highly dispersed solid material. Among them, pure SiO 2 Aerogels are severely limited in application due to their poor mechanical properties. Therefore, the SiO 2 The airgel mat made of composite airgel and fiber mat has become the mainstream airgel product form in the market. As a new type of thermal insulation material, it is widely used in building insulation, sound absorption, oil and gas transportation in refining and petrochemical industries, steam pipelines and process pipelines, which can effectively r...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B38/04C04B111/28C04B111/40
CPCC04B30/02C04B38/04C04B2111/40C04B2201/20C04B2201/50C04B2201/32C04B2111/28C04B14/42C04B14/064C04B24/42Y02B80/10
Inventor 李文彦刘兵汤婷婷王文建夏军
Owner 四川三棵树涂料有限公司
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