Preparation method of nanopore SiO2 doped foaming cement

A foamed cement and nanoporous technology, applied in the field of building thermal insulation materials, can solve the problems of affecting the flame retardant performance of the material, increase the adhesion of the thermal insulation board to the wall, etc., and achieve mild conditions, comprehensive moisture-proof performance, and simple reaction process. Effect

Inactive Publication Date: 2015-03-25
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

However, the method of surface compounding increases the difficulty of bonding the insulation board to the wall, and

Method used

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  • Preparation method of nanopore SiO2 doped foaming cement

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Example Embodiment

[0027] Implementation case 1

[0028] Mix ethyl orthosilicate, water and absolute ethanol in a certain weight ratio, and mix uniformly by ultrasonic for 20 min at room temperature. Add an appropriate amount of alkali catalyst ammonium fluoride / ammonia water, and then ultrasonically mix again, then seal the above solution. , Incubate at 40 ℃ for 30 min to form a gel. Place the obtained gel in an appropriate amount of absolute ethanol, age for at least 24 hours, and change the ethanol solution every 24 hours, 4 times. Using absolute ethanol as the supercritical solvent, supercritical drying at 260 ℃ to obtain nanoporous SiO 2 . Among them, the weight ratio of ethyl orthosilicate, water, absolute ethanol, ammonium fluoride, and ammonia water is 1:3.6:3.6:0.04:0.4.

[0029] Cement, nanoporous SiO 2 , Fly ash, glass fiber, calcium stearate, and water are mixed uniformly according to a certain weight ratio, and then add hydrogen peroxide to the above-mentioned mixed slurry, stir it wit...

Example Embodiment

[0030] Implementation case 2

[0031] Mix methyltrimethoxysilane, 3-aminopropyltriethoxysilane, resorcinol, formaldehyde and absolute ethanol in a weight ratio of 1:1:0.4:0.5:12, and stir at room temperature for 20 min. They were mixed uniformly, the above solution was sealed and stored, and kept at 40°C for 24 hours to form a gel. Then the obtained gel was immersed in ethanol, kept at 40 ℃ for 24 h to remove residual chemical substances, and then dried at 60 ℃ for 24 h to obtain modified nanoporous SiO 2 .

[0032] The cement, modified nanoporous SiO 2 , Fly ash, glass fiber, calcium stearate, and water are mixed uniformly according to a certain weight ratio, and then add hydrogen peroxide to the above-mentioned mixed slurry, stir it with a high-speed mixer for 30 s, inject it into the mold, and then at 40 ℃ Aging for 24 h to obtain doped modified nanoporous SiO 2 Foamed cement. Among them, cement, modified nanoporous SiO 2 The weight ratio of fly ash, glass fiber, hydrogen pero...

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Abstract

The invention discloses a preparation method of nanopore SiO2 doped foaming cement and belongs to the technical field of thermal insulation materials for construction. The foaming cement is doped with the nanopore SiO2 which has excellent properties such as ultra-low heat conductivity coefficient and density, ultra-large porosity, non-inflammability and hydrophobicity, and therefore, the nanopore SiO2 doped foaming cement is obtained; the comprehensive properties, for example, thermal insulation property, flame resistance and moisture resistance, of the nanopore SiO2 doped foaming cement are improved without affecting the practical properties thereof, such as fitting with a wall. The preparation method of the nanopore SiO2 doped foaming cement is simple in reaction process, mild in conditions, short in flow and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials for buildings, in particular to a doped nanoporous SiO 2 The preparation method of foamed cement. Background technique [0002] As a new type of inorganic thermal insulation material, foamed cement has many advantages such as high porosity, low density, flame retardancy, and environmental protection. Effect. In the external thermal insulation system of external walls, traditional thermal insulation materials are generally organic thermal insulation materials such as polyurethane and polystyrene. Building external insulation materials adopt materials with combustion performance of Class A (non-combustible), and the country began to vigorously develop inorganic insulation materials with high-efficiency flame-retardant properties. Foamed cement has received high attention due to its excellent thermal insulation and flame-retardant properties. . [0003] Under the framework ...

Claims

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Application Information

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IPC IPC(8): C01B33/12C04B38/02C04B28/00
Inventor 王戈高鸿毅金召奎栾奕董文钧党蕊李洁谭丽
Owner UNIV OF SCI & TECH BEIJING
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