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An expanded perlite-sio 2 Preparation method of airgel lightweight thermal insulation wall material

A technology of expanded perlite and thermal insulation wall, applied in the field of building materials, can solve the problems of high compressive strength, low compressive strength, low water absorption rate, etc.

Active Publication Date: 2020-07-21
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the existing problems of low compressive strength, poor thermal insulation performance, and high water absorption in the existing technology for preparing fly ash thermal insulation materials, the present invention uses the technology of fly ash unburned bricks to prepare a kind of expanded perlite -SiO 2 The preparation method of airgel light-weight thermal insulation wall material can not only improve the utilization rate of fly ash and meet the development requirements of my country's energy conservation and emission reduction, but also the prepared thermal insulation brick has good thermal insulation performance, high compressive strength and high water absorption rate. Low, meet the requirements of GB / T-29060-2012 of "Composite Insulation Bricks and Composite Insulation Blocks"

Method used

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  • An expanded perlite-sio <sub>2</sub> Preparation method of airgel lightweight thermal insulation wall material
  • An expanded perlite-sio <sub>2</sub> Preparation method of airgel lightweight thermal insulation wall material

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Experimental program
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Effect test

Embodiment 1

[0037] (1) With TEOS as precursor, EtOH as solvent, H 2 SO 4 and NH 3 ·H 2 O is the catalyst. Under continuous stirring, stir and mix TEOS and EtOH with a molar ratio of 1:5, and then add purified water and H 2 SO 4 , adjust the pH of the mixed solution system to 2.5, after stirring for 30 hours, add NH 3 ·H 2 O and purified water, adjust the pH of the mixed solution system to be 6;

[0038] (2) Heating the perlite at a high temperature of 1200°C to obtain expanded perlite, adding the expanded perlite to the SiO obtained in step (1) 2 In the sol, stir until the sol turns into a gel;

[0039] (3) Soak the gel obtained in step (2) in 100% distilled water for 24 hours, then soak it in 50% ethanol aqueous solution for 24 hours, and finally soak it in 100% ethanol for 24 hours. The temperature of the whole process control system is 38 degrees;

[0040] (4) Soak the gel obtained in step (3) in a 1:5:5 TMCS: EtOH: n-hexane mixed solution for 24 hours, then soak it in a 1:7 TM...

Embodiment 2

[0044] (1) With TEOS as precursor, EtOH as solvent, H 2 SO 4 and NH 3 ·H 2 O is the catalyst, under continuous stirring, stir and mix TEOS and EtOH with a molar ratio of 0.5:6, and then add purified water and H 2 SO 4 , adjust the pH of the mixed solution system to 3.5, after stirring for 24 hours, add NH 3 ·H 2 O and purified water, adjust the pH of the mixed solution system to be 7.5;

[0045] (2) Heating the perlite at a high temperature of 1000°C to obtain expanded perlite, adding the expanded perlite to the SiO obtained in step (1) 2 In the sol, stir until the sol turns into a gel;

[0046] (3) soak the gel obtained in step (2) in 100% distilled water for 30 hours, then soak in 50% ethanol aqueous solution for 30 hours, and finally soak in 100% ethanol for 30 hours, and the temperature of the whole process control system is 40 degrees;

[0047] (4) Soak the gel obtained in step (3) in a molar ratio of 0.5:4:3 in TMCS:EtOH:n-hexane mixed solution for 20 hours, then...

Embodiment 3

[0051] (1) With TEOS as precursor, EtOH as solvent, H 2 SO 4 and NH 3 ·H 2 O is the catalyst, under continuous stirring, stir and mix TEOS and EtOH with a molar ratio of 1.5:4, and then add purified water and H 2 SO 4 , adjust the pH of the mixed solution system to 3, after stirring for 30 hours, add NH 3 ·H 2 O and purified water, adjust the pH of the mixed solution system to be 8;

[0052] (2) Heating the perlite at a high temperature of 1300°C to obtain expanded perlite, adding the expanded perlite to the SiO obtained in step (1) 2 In the sol, stir until the sol turns into a gel;

[0053] (3) soak the gel obtained in step (2) in 100% distilled water for 20 hours, then soak in 50% ethanol aqueous solution for 20 hours, and finally soak in 100% ethanol for 20 hours, and the temperature of the whole process control system is 25 degrees;

[0054] (4) Soak the gel obtained in step (3) in a 1.5:6:5 TMCS: EtOH: n-hexane mixed solution for 30 hours, then soak it in a 1:10 T...

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Abstract

The invention discloses a preparation method of a lightweight thermal insulating wall material of expanded perlite-SiO2 aerogel. The preparation method comprises the following steps of by taking TEOSas a precursor, EtOh as a solvent and H2SO4 and NJ3.H2O as catalysts, adopting acid / alkali two-step catalytic reaction to prepare SiO2 sol, then stirring the SiO2 sol until the sol turns into gel, performing ageing, solvent exchange, surface modification and online temperature raising drying, mixing coal ash, water glass, a polyurethane foaming agent and cement with a product, adding a mixture ina mixer, adding a proper amount of water, uniformly stirring and mixing, performing maintenance to prepare a thermal insulation block, standing for a period of time under the natural condition, and then sending a the thermal insulation block into an autoclave reaction kettle for maintenance to prepare the lightweight thermal insulating wall material. By adopting the preparation method provided bythe invention, in the production process of a novel coal ash porous thermal insulation material, the energy is saved, the main raw material is a solid waste, the cost is low, and the manufactured thermal insulation material accords with the quality requirement with the strength and the thermal insulation performance reaching the standard.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a thermal insulation material, in particular to an expanded perlite-SiO 2 The invention discloses a preparation method of an airgel lightweight thermal insulation wall material. Background technique [0002] Energy consumption has always been a major problem in the current human development society. It is well known that the building sector mainly contributes to energy consumption and overall CO2 emissions. One of the key elements in meeting carbon reduction commitments is reducing energy consumption in buildings. The contribution rate of energy saving in building energy saving can reach 40-65%. Proper design and selection of the building envelope and its components is an important means of reducing heating and air conditioning loads. In terms of proportion, the energy consumption of buildings accounts for about 3-4% of the total energy consumption. In general, wall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B38/10C04B38/08C04B18/02C04B14/06
CPCC04B14/064C04B18/027C04B28/006C04B2201/32C04B2201/50C04B7/00C04B12/04C04B18/08C04B24/282C04B38/10C04B14/18
Inventor 张以河褚博华刘金刚王新珂陈飞旭李新建吕凤柱郝向阳张娜
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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