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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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Problems solved by technology

However, the method of surface compounding increases the difficulty of bonding the insulation board to the wall, and the compounding method of adding organic thermal insulation materials will affect the flame retardancy of the material

Method used

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  • Preparation method of nanopore SiO2 doped foaming cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0028] Mix tetraethyl orthosilicate, water, and absolute ethanol in a certain weight ratio, and mix uniformly at room temperature for 20 minutes, add an appropriate amount of alkali catalyst ammonium fluoride / ammonia water, and ultrasonically mix again, then seal and store the above solution , and incubated at 40 °C for 30 min to form a gel. Place the obtained gel in an appropriate amount of absolute ethanol, age for at least 24 h, change the ethanol solution every 24 h, and change it 4 times. Using absolute ethanol as a supercritical solvent, supercritical drying was carried out at 260 °C to obtain nanoporous SiO 2 . Wherein, 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 uniformly mixed according to a certain weight ratio, then hydrogen peroxide is added to the above mixed slurry, stirred by a high-speed m...

Embodiment example 2

[0031] Mix methyltrimethoxysilane, 3aminopropyltriethoxysilane, 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 to make It was mixed evenly, and the above solution was sealed and stored, and kept at 40 °C for 24 h to form a gel. The obtained gel was then soaked in ethanol, incubated at 40 °C for 24 h to remove residual chemical substances, and then dried at 60 °C for 24 h to obtain the modified nanoporous SiO 2 .

[0032] Cement, modified nanoporous SiO 2 , fly ash, glass fiber, calcium stearate, and water are uniformly mixed according to a certain weight ratio, then hydrogen peroxide is added to the above mixed slurry, stirred by a high-speed mixer for 30 s, injected into the mold, and then heated at 40 °C Aged for 24 h to obtain doped modified nanoporous SiO 2 foam cement. Among them, cement, modified nanoporous SiO 2 , fly ash, glass fiber, hydrogen peroxide, calcium stearate, and water in a wei...

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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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