A kind of calcium sulfate whisker airgel thermal insulation composite material and preparation method thereof

A calcium sulfate whisker and composite material technology, which is applied in the field of calcium sulfate whisker airgel thermal insulation composite material and its preparation, can solve the problems of high production cost and complicated preparation process, and achieve good block formation and high safety , the effect of good mechanical properties

Active Publication Date: 2016-08-24
GUANGZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention also proposes a preparation method of calcium sulfate whisker airgel thermal insulation composite material, which overcomes the defects of complex preparation process and high production cost of airgel in the prior art

Method used

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  • A kind of calcium sulfate whisker airgel thermal insulation composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] According to the content of the present invention, the contriver makes calcium sulfate whisker / SiO 2 Airgel 1, the specific steps are as follows:

[0040] (1) Add stearic acid and calcium sulfate whiskers into absolute ethanol, stir for 0.5 hours at a temperature of 50°C and a stirring speed of 500 rpm, and then put it in a drying oven at 80°C for 8 hours , to obtain modified calcium sulfate whiskers;

[0041] (2) Add tetraethyl orthosilicate to absolute ethanol, and then add water and hydrochloric acid in turn under the conditions of temperature of 30°C and stirring speed of 200 rpm, so that the pH value is between 3, and a mixture is obtained. Solution A, the ratio of ethyl orthosilicate, absolute ethanol, water, and hydrochloric acid is 1:5:2:1×10 in molar ratio -5 ; The mixed solution A was left to stand at a temperature of 30°C for 0.1 hour, and then at a temperature of 30°C and a stirring speed of 600 rpm, DMF was added, and after stirring for 3 minutes, ammonia...

Embodiment 2

[0046] According to the content of the present invention, the contriver makes calcium sulfate whisker / SiO 2 Airgel 2, the specific steps are as follows:

[0047] (1) Add sodium lauryl sulfate and calcium sulfate whiskers into anhydrous methanol, stir for 1 hour at a temperature of 80°C and a stirring speed of 1000 rpm, and then put it into a drying oven at 120°C In 24 hours, obtain the modified calcium sulfate whisker;

[0048] (2) Water glass is added in anhydrous methanol, under the condition that the temperature is 60° C. and the stirring speed is 800 rpm, water and oxalic acid are added successively to make the pH value between 4 to obtain the mixed solution A, The ratio of the water glass, anhydrous methanol, water and oxalic acid is 1:40:10:5×10 in molar ratio -5 ; The mixed solution A was left to stand at a temperature of 80°C for 24 hours, and then at a temperature of 60°C and a stirring speed of 800 rpm, formamide was added, and after stirring for 3 minutes, sodium ...

Embodiment 3

[0053] According to the content of the present invention, the contriver makes calcium sulfate whisker / SiO 2 Airgel 3, the specific steps are as follows:

[0054] (1) Add Tween-80 and calcium sulfate whiskers to anhydrous isopropanol, stir for 0.8 hours at a temperature of 60°C and a stirring speed of 800 rpm, and then put it into a drying oven at 100°C Middle 12 hours, obtain the modified calcium sulfate whisker;

[0055] (2) Add diatomaceous earth to anhydrous isopropanol, under the condition of temperature of 50°C and stirring speed of 600 rpm, then add water and sulfuric acid in sequence to make the pH value between 3.5, and obtain a mixture Solution A, the molar ratio of diatomaceous earth, anhydrous isopropanol, water, and sulfuric acid is 1:20:8:3×10 -5 ; The mixed solution A was left to stand at a temperature of 60°C for 12 hours, and then at a temperature of 50°C and a stirring speed of 600 rpm, acetamide was added, and after stirring for 3 minutes, ammonium fluoride...

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Abstract

The present invention proposes a calcium sulfate whisker airgel thermal insulation composite material, comprising an airgel matrix and calcium sulfate whiskers, the airgel matrix is ​​filled between the calcium sulfate whiskers, and the calcium sulfate whiskers are air-condensed Adhesive insulation composite material has super heat insulation performance, fire resistance and non-combustibility, low density and good hydrophobicity, and also significantly improves the blockability and mechanical properties of airgel. The present invention also proposes a preparation method of calcium sulfate whisker airgel thermal insulation composite material, which adopts cheap calcium sulfate whisker and low-cost normal pressure drying process to replace the high-cost supercritical drying usually used in airgel preparation The technology significantly reduces the production cost of airgel thermal insulation materials, and can realize the large-scale and streamlined production of calcium sulfate whisker airgel composites.

Description

technical field [0001] The invention belongs to the technical field of functional materials and energy saving, and relates to a calcium sulfate whisker airgel thermal insulation composite material and a preparation method thereof. Background technique [0002] With the development of economy and society, human beings have more and more urgent needs for energy saving. Thermal insulation materials can effectively reduce the heat exchange between the medium and its environment. It is an effective energy-saving and environmental protection material, which is widely used in construction, industry, aerospace and other fields. [0003] Airgel is currently the best solid material for thermal insulation. Airgel is composed of colloidal particles or polymer molecules cross-linked with each other. It has a nanoporous space grid structure and a specific surface area of ​​up to 500-1200m 2 g -1 , The porosity can reach 99.8%, and the pore size is about 10-100nm. This nano-space struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/24C04B14/38
Inventor 吴会军钟支葵陈奇良周孝清
Owner GUANGZHOU UNIVERSITY
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